​RANDOM ACCESS METHOD AND APPARATUS
​TECHNICAL FIELD
[0001]
​Embodiments of the present invention relate to the technical field of communications, and in particular, to a random access method and apparatus.
​BACKGROUND OF THE INVENTION
[0002]
​In the Long Term Evolution (LTE) system of the 3 rd Generation Partnership Project (3 GPP, 3 rd Generation Partnership Project), the terminal device needs to perform the processes such as cell search, system information acquisition (SI), random access, and the like when the terminal device initially accesses the network.. After obtaining the downlink synchronization through the cell search, the terminal device performs random access based on information such as the random access configuration contained in the system information, thereby establishing a connection with the cell and obtaining uplink synchronization.
[0003]
​FIG. 1 is a schematic diagram of a random access procedure of LTE to illustrate by taking a contention-based random access procedure as an example, at least comprising: a terminal device sending a preamble, a network device feeding back a random access response (RAR), a terminal device sending an Msg3 through a physical uplink shared channel (PUSCH), and a network device feeding back to four steps such as Msg4 by means of a Physical Downlink Shared Channel (PDSCH).. This random access procedure may be referred to as a four-step random access.
[0004]
​FIG. 2 is a schematic diagram of a random access procedure of NR, which may be referred to as two-step random access.. Compared with the traditional four-step random access, the two-step random access can access the network more quickly.. As shown in FIG. 2, when two-step random access, the terminal device sends an MSGA, where the MSGA carries at least a preamble and Msg3 information during four-step random access; the network device sends MSGB to the terminal device, where the MSGB carries at least the RAR and the Msg4 information during four-step random access.
[0005]
​It should be noted that the above description of the technical background is only for a clear and complete explanation of the technical solutions of the present invention, and it is convenient for a person skilled in the art to understand.. The above technical solutions are not considered to be known to those skilled in the art only because these solutions are set forth in the background section of the present invention.
[0006]
​SUMMARY OF THE INVENTION
[0007]
​The inventors have found that, for two-step random access, how to define a mapping relationship between a preamble and an uplink data resource and a demodulation Reference Signal (DM-RS) port is still an open problem, and there is no effective solution.
[0008]
​For at least one of the above problems, an embodiment of the present invention provides a random access method and apparatus
[0009]
​According to a first aspect of the embodiments of the present disclosure, a random access method is provided, including:
[0010]
​sending, by a terminal device, a first random access request comprising at least a preamble, an uplink data, and a demodulation reference signal to a network device; wherein the mapping of the uplink data channel resource of the preamble to the uplink data and the demodulation reference signal port of the demodulation reference signal is determined according to configuration information from the network device or configured by the network device; and
[0011]
​Receiving a random access response sent by the network device
[0012]
​According to a second aspect of the embodiments of the present disclosure, a random access apparatus is provided, including:
[0013]
​a sending unit, configured to send a first random access request comprising at least a preamble, an uplink data and a demodulation reference signal to a network device; wherein the mapping of the uplink data channel resource of the preamble to the uplink data and the demodulation reference signal port of the demodulation reference signal is determined according to configuration information from the network device or configured by the network device; and
[0014]
​A receiving unit receives a random access response sent by the network device
[0015]
​According to a third aspect of the embodiments of the present invention, there is provided a random access method, comprising:
[0016]
​receiving a first random access request sent by the terminal device at least comprising a preamble, an uplink data, and a demodulation reference signal; wherein the mapping of the uplink data channel resource of the preamble to the uplink data and the demodulation reference signal port of the demodulation reference signal is determined according to configuration information from the network device or configured by the network device; and
[0017]
​Sending a random access response to the terminal device
[0018]
​According to a fourth aspect of the embodiments of the present disclosure, a random access apparatus is provided, including:
[0019]
​a receiving unit, configured to receive a first random access request sent by the terminal device at least comprising a preamble, an uplink data, and a demodulation reference signal; wherein the mapping of the uplink data channel resource of the preamble to the uplink data and the demodulation reference signal port of the demodulation reference signal is determined according to configuration information from the network device or configured by the network device; and
[0020]
​a sending unit, configured to send a random access response to the terminal device.
[0021]
​According to a fifth aspect of the embodiments of the present invention, there is provided a communication system, comprising:
[0022]
​a terminal device, configured to send a first random access request comprising at least a preamble, an uplink data and a demodulation reference signal to a network device; and receive a random access response sent by the network device;
[0023]
​a network device receiving the first random access request and sending the random access response to the terminal device; wherein the mapping of the uplink data channel resource of the preamble to the uplink data and the demodulation reference signal port of the demodulation reference signal is determined according to configuration information from the network device or configured by the network device.
[0024]
​One of the beneficial effects of the embodiments of the present invention is that: the mapping of the preamble to the uplink data channel resource and the demodulation reference signal port is implicitly configured or explicitly configured by the network device according to the configuration information; therefore, the mapping relationship between the preamble and the uplink data resource and the DM-RS port can be determined, and the network device can immediately obtain the PUSCH and the DM-RS information associated therewith based on the received preamble, so that the random access performance can be improved, and sufficient configuration flexibility can be provided.
[0025]
​With reference to the following description and drawings, specific embodiments of the invention are disclosed in detail, indicating the manner in which the principles of the invention may be employed. It should be understood that the embodiments of the present invention are not limited in scope. Within the spirit and the scope of the appended claims, embodiments of the invention include many changes, modifications, and equivalents.
[0026]
​Features described and/or illustrated for one embodiment may be used in the same or similar manner in one or more other embodiments, combined with features in other embodiments, or substituted for features in other embodiments.
[0027]
​It should be emphasized that the term "comprising/comprising" when used herein refers to the presence of features, integers, steps or components, but does not preclude the presence or addition of one or more other features, integers, steps or components.
​BRIEF DESCRIPTION OF THE DRAWINGS
[0028]
​Elements and features described in one or more embodiments of the invention may be combined with elements and features illustrated in one or more other figures or embodiments. In addition, in the drawings, like reference numerals designate corresponding parts in several drawings, and may be used to indicate corresponding components used in more than one embodiment.
[0029]
​FIG. 1 is a schematic diagram of a random access procedure of LTE;
[0030]
​FIG. 2 is a schematic diagram of a random access procedure of NR;
[0031]
​FIG. 3 is a schematic diagram of a communication system according to an embodiment of the present invention;
[0032]
​FIG. 4 is a schematic diagram of a random access method according to an embodiment of the present invention;
[0033]
​FIG. 5 is another schematic diagram of a random access method according to an embodiment of the present invention;
[0034]
​FIG. 6 is an example diagram of resource mapping according to an embodiment of the present invention;
[0035]
​FIG. 7 is another example diagram of resource mapping according to an embodiment of the present invention;
[0036]
​FIG. 8 is another example diagram of resource mapping according to an embodiment of the present invention;
[0037]
​FIG. 9 is another example diagram of resource mapping according to an embodiment of the present invention;
[0038]
​FIG. 10 is another example diagram of resource mapping according to an embodiment of the present invention;
[0039]
​FIG. 11 is another example diagram of resource mapping according to an embodiment of the present invention;
[0040]
​FIG. 12 is another example diagram of resource mapping according to an embodiment of the present invention;
[0041]
​FIG. 13 is another example diagram of resource mapping according to an embodiment of the present invention;
[0042]
​FIG. 14 is another example diagram of resource mapping according to an embodiment of the present invention;
[0043]
​FIG. 15 is another example diagram of resource mapping according to an embodiment of the present invention;
[0044]
​FIG. 16 is another example diagram of resource mapping according to an embodiment of the present invention;
[0045]
​FIG. 17 is an example diagram of time-frequency resource mapping according to an embodiment of the present invention;
[0046]
​FIG. 18 is another example diagram of resource mapping according to an embodiment of the present invention;
[0047]
​FIG. 19 is another schematic diagram of a random access method according to an embodiment of the present invention;
[0048]
​FIG. 20 is a schematic diagram of a random access device according to an embodiment of the present invention;
[0049]
​FIG. 21 is another schematic diagram of a random access device according to an embodiment of the present invention;
[0050]
​FIG. 22 is a schematic diagram of a network device according to an embodiment of the present invention;
[0051]
​FIG. 23 is a schematic diagram of a terminal device according to an embodiment of the present disclosure
​DETAILED DESCRIPTION OF THE EMBODIMENTS
[0052]
​The foregoing and other features of the invention will become apparent from the following description with reference to the accompanying drawings.. In the specification and drawings, specific embodiments of the present invention are specifically disclosed, which illustrate some embodiments in which the principles of the invention may be employed, and it is to be understood that the invention is not limited to the embodiments described, but on the contrary, the invention includes all modifications, variations, and equivalents falling within the scope of the appended claims.
[0053]
​In the embodiments of the present disclosure, the terms "first", "second" and the like are used to distinguish different elements from names, but do not indicate the spatial arrangement or chronological order of these elements, etc. and these elements should not be limited by these terms. The term "and/or" includes any and all combinations of one or more of the associated listed terms. The terms "comprising," " including, " "having," and the like refer to the presence of stated features, elements, elements, or components, but do not preclude the presence or addition of one or more other features, elements, elements, or components.
[0054]
​In the embodiments of the present invention, the singular forms "a", "the" and the like include plural forms and should be construed broadly to mean "a" or "a type" and not to limit the meaning of "an"; in addition, the term "the" should be understood to include both the singular and the plural as well, unless the context clearly indicates otherwise. In addition, the term "according to" should be understood as "based at least in part on. The term" based on "should be understood as" based at least in part on. " Unless the context clearly dictates otherwise.
[0055]
​In the embodiments of the present disclosure, the term "communication network" or "wireless communication network" may refer to a network conforming to any communication standard, such as Long Term Evolution (LTE), enhanced Long Term Evolution (LTE-A, LTE-Advanced), Wideband Code Division Multiple Access (WCDMA), Wideband Code Division Multiple Access (WCDMA), High Speed Packet Access (HSPA), High-Speed Packet Access (HSPA), etc.
[0056]
​In addition, the communication between devices in the communication system may be performed according to a communication protocol at any stage, for example, may include, but is not limited to, the following communication protocols: 1G (Generation), 2G, 2.5 G, 2.75 G, 3G, 4G, 4.5 G, and 5G, New Radio (NR, New Radio, etc.), and/or other communication protocols currently known or future to be developed.
[0057]
​In the embodiment of the present invention, the term "network device" refers to a device in a communication system for accessing a terminal device to a communication network and providing a service for the terminal device. The network device may include, but is not limited to, a base station (BS), an access point (AP), a transmission reception point (TRP), a transmission reception point (AP), a broadcast transmitter, a mobility management entity (MME), a mobile management entity (RNC), a gateway, a server, a radio network controller (RNC), and a radio network controller (RNC).​For example, the Base Station Controller (BSC) and the Base Station Controller (BSC), etc.
[0058]
​The base station may include, but is not limited to, a Node B (NodeB or NB), an evolved Node B (eNodeB or eNB), and a 5G base station (GMS), and the like, and may further include a Remote Radio Head (RRH), a Remote Radio Unit (RRU), a Remote Radio Unit (RRU), a relay or a low power node (eg, FeMeO, Pico, etc.).. And the term "base station" may include some or all of their functionalities, each of which may provide communication coverage for a particular geographic area. The term "cell" may refer to a base station and/or its coverage area, depending on the context in which the term is used
[0059]
​In the embodiment of the present invention, the term "user equipment" (UE) or "terminal device" (TE, Terminal Equipment Equipment or Terminal Device) refers to a device that accesses a communication network through a network device and receives a network service. The terminal device may be fixed or mobile, and may also be referred to as a mobile station (MS), a terminal, a subscriber station (SS), an access terminal (AT), a station, etc.
[0060]
​The terminal device may include, but is not limited to, a Cellular Phone, a Personal Digital Assistant (PDA), a wireless modem, a wireless communication device, a handheld device, a machine-type communication device, a laptop computer, a cordless telephone, a smartphone, a smart watch, a Digital camera, etc.
[0061]
​For another example, in a scenario such as an Internet of Things (Internet of Things), a terminal device may also be a machine or a device for monitoring or measuring, for example, may include, but is not limited to, a machine-type communication (MTC) terminal, a vehicle-mounted communication terminal, a device-to-device (D2D) terminal, a machine-to-machine (M2M) terminal, and the like.
[0062]
​In addition, the term "network side" or "network device side" refers to one side of a network, may be a certain base station, or may include one or more network devices as above. The terms "user side" or "terminal side" or "terminal device side" refer to one side of a user or a terminal, may be a certain UE, or may include one or more terminal devices as above.
[0063]
​The following describes the scenario of the embodiments of the present disclosure by way of example, but the present disclosure is not limited thereto
[0064]
​FIG. 3 is a schematic diagram of a communication system according to an embodiment of the present disclosure. As shown in FIG. 3, the communication system 100 May include the network device 101 and the terminal devices 102, 103, for simplicity, FIG. 3 illustrates only two terminal devices and one network device as an example, but the embodiments of the present disclosure are not limited thereto
[0065]
​In the embodiment of the present invention, the network device 101 and the terminal device 102, 103 May perform existing service or future implementations of service transmission. For example, these services may include, but are not limited to: Enhanced Mobile Broadband (Enhanced Mobile Broadband), Large-Scale Machine Type Communication (MWU), Massive Machine Type Communication (URLLC), and High Reliability Low Latency Communication (URLLC), etc.
[0066]
​It should be noted that FIG. 3 shows that both terminal devices 102 and 103 are within the coverage of the network device 101, but the present disclosure is not limited thereto. Both terminal devices 102, 103 May not be within the coverage of the network device 101, or one terminal device 102 is within the coverage of the network device 101 and the other terminal device 103 is outside the coverage of the network device 101.
[0067]
​Two-step random access is one of work item studies of NR Rel -16. NR_Rel -15 defines a physical random access channel (PRACH, Physical Random Access Channel) opportunity (occasion), and the PRACH opportunity is a time-frequency resource comprising several preambles (including preamble resources or preambles capable of being used for transmitting a preamble), and different PRACH opportunities may be frequency division multiplexing or time division multiplexing. In a certain PRACH opportunity, multiple preambles are multiplexed in a code division multiplexing manner.
[0068]
​The two-step random access follows the definition of the PRACH opportunity and defines the PUSCH opportunity in a similar manner. The PUSCH transmission opportunity is a time-frequency resource including a plurality of PUSCH resources, where the PUSCH resource refers to a time-frequency resource where the PUSCH of uplink data in a certain MSGA is located, and the PUSCH opportunity may include a plurality of the PUSCH resources.
[0069]
​For the physical layer design of two-step random access, it is important that after the network device recognizes a certain preamble, it is necessary to know where to demodulate the PUSCH of the MSGA, and based on which DM-RS performs channel estimation, it is necessary to define the mapping relationship between the preamble and the PUSCH resource and the DM-RS port, so that the network device does not need to perform blind detection, but can immediately obtain the PUSCH and the DM-RS information associated therewith based on the received preamble.. At present, how to define a mapping relationship between a preamble and a PUSCH resource and a DM-RS port is still an open problem.
[0070]
​An embodiment of the present invention provides a random access scheme, which determines a mapping relationship between a preamble and a PUSCH resource and a DM-RS port. The mapping relationship may be summarized as a mapping between a preamble and a (PUSCH resource, DM-RS port) tuple, thereby providing sufficient configuration flexibility; it may support mapping one preamble to one tuple, and may also support mapping one preamble to multiple tuples, thereby satisfying different application requirements, and achieving a reasonable compromise between random access performance and resource utilization.. In addition, the random access performance can be further improved by flexible DM-RS configuration, PUSCH grouping, four-step random access and two-step random access.
[0071]
​In the following description, certain concepts are not strictly distinguished without causing confusion, for example, "uplink data channel" and "PUSCH" may be interchanged, "preamble" and "preamble" or "preamble resource" may be interchanged, and "random access channel" and "PRACH" may be interchanged.
[0072]
​Embodiment 1
[0073]
​An embodiment of the present invention provides a random access method, which is described from a terminal device side. FIG. 4 is a schematic diagram of a random access method according to an embodiment of the present disclosure, as shown in FIG. 4, the method includes:
[0074]
​Step 401: A terminal device sends a first random access request comprising at least a preamble, an uplink data, and a demodulation reference signal to a network device; wherein the mapping of the uplink data channel resource of the preamble to the uplink data and the demodulation reference signal port of the demodulation reference signal is determined according to configuration information from the network device or configured by the network device; and
[0075]
​Step 402: The terminal device receives a random access response sent by the network device.
[0076]
​In an embodiment of the present invention, a preamble may be mapped to at least one tuple of the uplink data channel resource and the demodulation reference signal port, for example, may be represented as a (PUSCH resource, a DM-RS port); and one uplink data channel resource is at least configured with a demodulation reference signal port.
[0077]
​In this embodiment, the mapping may be implicitly configured according to the configuration information from the network device (eg, the preamble, the uplink data channel resource, and the configuration information of the demodulation reference signal port), whereby both the terminal device and the network device may determine the mapping.. The mapping may also be explicitly configured by the network device to the terminal device.
[0078]
​FIG. 5 is another schematic diagram of a random access method according to an embodiment of the present disclosure, and the interaction between the network device and the terminal device is described.. As shown in FIG. 5, the random access method includes:
[0079]
​Step 501: The network device configures a front guide, an uplink data channel resource, and a demodulation reference signal port for the terminal device.. In addition, the network device may not explicitly configure the mapping, and the terminal device implicitly determines the mapping according to various embodiments described below; or the network device may also explicitly configure the mapping.
[0080]
​Step 502: The terminal device sends a first random access request including at least a preamble, an uplink data, and a demodulation reference signal to a network device; and
[0081]
​Step 503: The terminal device receives a random access response sent by the network device.
[0082]
​In step 501, a two-step random access preamble, a PUSCH Resource, and a DM-RS port may be configured to a terminal device by a network device through a broadcast message, such as a System Information Block (SIB) or a master Information Block (MIB), or a Radio Resource Control (RRC) signaling.. The network device may achieve a desired mapping relationship by controlling the number of configured PUSCH resources, the number of DM-RS ports, and the number of preambles.
[0083]
​It should be noted that, FIG. 4 and FIG. 5 are merely schematic illustrations of the embodiments of the present disclosure, but the present disclosure is not limited thereto. For example, the order of execution between the various steps may be appropriately adjusted, and in addition, some other steps may be added, or some of the steps therein May be reduced. Those skilled in the art may make appropriate variations according to the above-mentioned content, but are not limited to the disclosure of FIG. 4 or FIG. 5.
[0084]
​In one embodiment, the preamble is mapped as follows: a plurality of demodulation reference signal ports of an uplink data channel resource are performed in ascending order of indexes, and multiple uplink data channel resources are performed in ascending order of frequency.
[0085]
​FIG. 6 is an example diagram of resource mapping according to an embodiment of the present disclosure. As shown in FIG. 6, the network device configures N = 4 preambles, configures R = 4 PUSCH resources, and configures P = 1 DM-RS ports for each PUSCH resource.
[0086]
​According to the mapping sequence, the preamble is incremented according to the frequency; that is, from the preamble 0 to the preamble 3; (the PUSCH resource, the DM-RS port) tuple is sequentially mapped according to a DM-RS port index in one PUSCH resource, and then the frequency division multiplexed PUSCH resource is mapped according to a frequency increment order.. Thus, the mapping of FIG. 6 May be obtained with one preamble mapped to one PUSCH resource and one DM-RS port, ie, one preamble mapped to one (PUSCH resource, DM-RS port) tuple.
[0087]
​Each PUSCH resource may be independently configured with a DM-RS port, and any DM-RS port index may be configured, since it is configured to use which DM-RS port has no difference in performance, for simplicity, FIG. 6 is configured as a DM-RS port 0.
[0088]
​The size of each PUSCH resource may be configured to be the same or different, and FIG. 6 configures each PUSCH resource to have the same size, so that the terminal device may perform the preamble selection with equal probability, and the terminal device does not generate a preference for the preamble selection due to different sizes of the PUSCH resources, thereby not increasing the probability of collision occurring on the partial preamble and part of the PUSCH resources.
[0089]
​For a number of PUSCH resources configured, it may be configured to be contiguous with each other when conditions are allowed, such that frequency resource fragments may be reduced, PUSCH resources are limited within a limited range, and resources outside this range may be used for other uses.
[0090]
​FIG. 7 is another example diagram of resource mapping according to an embodiment of the present invention, as shown in FIG. 7, the network device configures N = 8 preambles, configures R = 4 PUSCH resources, and configures P = 2 DM-RS ports for each PUSCH resource.
[0091]
​According to the above mapping sequence, the mapping of FIG. 7 can be obtained, wherein one preamble is mapped to one PUSCH resource and one DM-RS port, that is, one preamble is mapped to one (PUSCH resource, DM-RS port) tuple. Different preambles may be mapped to the same PUSCH resources, that is, PUSCH resources corresponding to different preambles overlap each other (or coincide), but different preambles are mapped to different DM-RS ports, so different preambles still map to different (PUSCH resources, DM-RS ports) tuples.
[0092]
​When the network device uses a more advanced receiver (eg, a receiver with an interference cancellation function), even if two PUSCH resources overlap, the network device can still successfully demodulate the two PUSCH as long as the DM-RS ports associated with the two PUSCH resources are different.. Even if the network device does not use a more advanced receiver, when two PUSCH resources overlap, but the associated DM-RS ports are different, in some cases the network device can still successfully demodulate a PUSCH.
[0093]
​By configuring multiple DM-RS ports for PUSCH resources, different preambles may be mapped to the same (or overlapping) PUSCH resources, thus increasing resource utilization.. For example, FIG. 7 is configured with 8 preambles, but only four PUSCH resources are configured instead of configuring 8 PUSCH resources. More DM-RS ports may be configured for each PUSCH resource.
[0094]
​FIG. 7 is an example of configuring two DM-RS ports.. Since the receiver cannot resolve and demodulate any plurality of PUSCH overlapping together, considering the receiver capability in the actual system, configuring two DM-RS ports can achieve an effective compromise between demodulation and decoding performance and resource utilization.. Any two DM-RS ports may be configured for PUSCH resources.
[0095]
​In one embodiment, one of the uplink data channel resources is configured with a first demodulation reference signal port and a second demodulation reference signal port that are frequency division multiplexed. As an implementation, FIG. 7 shows that the DM-RS port 0 and the port 2 are configured for the PUSCH resource, and the DM-RS port 0 and the port 2 are two ports multiplexed in a frequency division multiplexing manner, and compared with two ports (for example, DM-RS port 0 and port 1) multiplexed in a code division multiplexing manner, the frequency division multiplexing mode has better robustness for non-ideal factors such as non-synchronization and power imbalance in two-step random access.
[0096]
​In one embodiment, the demodulation reference signal configuration type 1 is used, and the first demodulation reference signal port and the second demodulation reference signal port (for example, the DM-RS port 0 and the DM-RS port 2) occupy 12 subcarriers in a frequency domain in one Resource Block (RB).
[0097]
​For example, when two DM-RS ports are configured, the DM-RS configuration type 1 (DM-RS configuration type 1) may be further configured and used. For the DM-RS configuration type 1, each DM-RS port occupies 6 Resource elements in one RB and one symbol (OFDM symbol or DFT-S-OFDM symbol), that is, 6 subcarriers in the frequency domain in one RB, so that the DM-RS port 0 and the port 2 occupy 12 REs in the full frequency domain in one RB and one symbol, that is, 12 subcarriers in the full frequency domain in the 1 RB. This has a higher DM-RS density than the DM-RS configuration type 2, which facilitates improving the accuracy of the channel estimation.
[0098]
​In one embodiment, one of the uplink data channel resources is configured with a third demodulation reference signal port and a fourth demodulation reference signal port that are code division multiplexed. In one embodiment, a DM-RS port 0 and a port 1 May be configured, that is, a DM-RS port configured in a code division multiplexing manner.
[0099]
​For example, considering that the PUSCH may also use Discrete Fourier Transform Spread Orthogonal Frequency Division Multiplexing (DFT-S-OFDM) and Discrete Fourier Transform Spread Orthogonal Frequency Division Multiplexing (DFT-S-OFDM) waveforms, the RE mapping of symbols where DM-RS is located is discontinuous by using 2 DM-RS ports (DM-RS ports 0 and port 2) of frequency division multiplexing, thereby affecting single-carrier characteristics.. Conversely, if the DM-RS port 0 and the port 1 are multiplexed using code division, the remaining REs in the symbol where the DM-RS are located may be used for PUSCH transmission, thereby maintaining the continuity of the RE mapping.
[0100]
​In one embodiment, in the case that the uplink data uses an orthogonal frequency division multiplexing (OFDM) waveform, a frequency division multiplexing first demodulation reference signal port and a second demodulation reference signal port are used; and in the case that the uplink data uses a DFT-S-OFDM waveform, a third demodulation reference signal port and a fourth demodulation reference signal port which are multiplexed are used.. In one embodiment, when more than 2 available DM-RS ports are configured, frequency division multiplexing (DM-RS) ports are preferentially selected and used.
[0101]
​FIG. 8 is another example diagram of resource mapping according to an embodiment of the present invention, as shown in FIG. 8, the network device configures N = 4 preambles, configures R = 8 PUSCH resources, and configures P = 1 DM-RS ports for each PUSCH resource.
[0102]
​According to the above mapping sequence, the mapping of FIG. 8 May be obtained, one preamble is mapped to two PUSCH resources, one DM-RS port is mapped in each PUSCH resource, that is, one preamble is mapped to two (PUSCH resources, DM-RS ports) tuples.
[0103]
​This mapping of FIG. 8 facilitates further avoiding collisions to a certain extent. For example, even if both the terminal device A and the terminal device B select the preamble 0, the two terminal devices also have a certain probability to select different PUSCH resources, thereby avoiding collision.
[0104]
​In one embodiment, the plurality of uplink data channel resources are at least configured as a first group and a second group, and one uplink data channel resource is at least configured with a demodulation reference signal port. Further, the size of the uplink data channel resource of the second group may be greater than the size of the uplink data channel resource of the first group.
[0105]
​FIG. 9 is another example diagram of resource mapping according to an embodiment of the present invention, and differs from FIG. 8 in that the network device configures a first group (group A) and a second group (group B) for a total of two groups of PUSCH resources, and the PUSCH resources of group A and group B have different sizes, and the PUSCH resources of group B in FIG. 9 have a larger size or a lower modulation scheme.
[0106]
​Taking the size as an example, the reserved large-size PUSCH resource may provide a certain degree of link adaptation for the user, for example, when the payload of the terminal device needs to be transmitted, the terminal device may carry the PUSCH resource with a large size. If the PUSCH resource group B having a larger size is configured, the terminal device may select the PUSCH resource group B when at least one of the following conditions is satisfied:
[0107]
​the random Access request is for a Common Control Channel (CCCH), and the size of a Service Data Unit (SDU) of the Common Control Channel plus a medium Access Control (MAC) is greater than a first threshold;
[0108]
​the size of the random access request is greater than a second threshold, and/or the path loss and/or the reference signal received power (RSRP) of the random access request is less than a third threshold; and the size of the random access request is, for example, a potential MSGA size, including a data packet that can be used for uplink transmission, a MAC subheader, and a MAC control element (CE, Control Element Element) that may be required;
[0109]
​the terminal device is in an RRC connected state, and has a User Plane (UP) data to be sent; optionally, the size of the load of the User Plane data is greater than a certain threshold;
[0110]
​a Block Error Rate (BLER) requirement, for example, a Block Error Rate greater than a fourth threshold;
[0111]
​Reference Signal Received Power (RSRP) is less than a fifth threshold;
[0112]
​channel ratio (SNR) or Signal to Interference plus Noise ratio (SINR) is less than a sixth threshold.
[0113]
​By defining the condition of selecting the group B by the terminal device, it is possible to prevent the terminal device from deliberately selecting a PUSCH resource with a large size, thereby avoiding excessive crowding of the terminal device within the PUSCH resource with a large size.. In addition, a degree of freedom of performing link adaptation is also provided for the terminal device.
[0114]
​In addition, the positions of group A and group B are not limited, and FIG. 9 is merely a schematic, and PUSCH resources of group A and group B may appear alternately, or in any other manner.. By using only two PUSCH resource groups as an example, more PUSCH resource groups may be configured according to needs.
[0115]
​Different PUSCH resource groups may also have different other parameters, and the parameters include at least one of the following: a modulation scheme, a code rate, a waveform, and a DM-RS configuration.
[0116]
​In one embodiment, the preamble mapped by the uplink data channel resource of the first group and the preamble mapped by the uplink data channel resource of the second group may be the same; or the preamble mapped by the uplink data channel resource of the first group is different from the preamble mapped by the uplink data channel resource of the second group.
[0117]
​FIG. 10 is another example diagram of resource mapping according to an embodiment of the present invention, and differs from FIG. 9 in that the PUSCH resource group A is mapped to a preamble different from the group B, that is, a preamble is mapped to one (PUSCH resource, DM-RS port) tuple.. By additionally configuring a greater number of preambles, the collision probability may be further reduced. The rules for selecting group B are equally applicable to FIG. 10.. FIG. 10 also has the benefit of supporting link adaptation.
[0118]
​FIG. 11 is another example diagram of resource mapping according to an embodiment of the present invention, as shown in FIG. 11, the network device configures N = 8 preambles, configures R = 8 PUSCH resources, and configures P = 2 DM-RS ports for each PUSCH resource.. According to the above mapping sequence, the mapping of FIG. 11 can be obtained, one preamble is mapped to two PUSCH resources, and one DM-RS port is mapped in each PUSCH resource.
[0119]
​In contrast to FIG. 7, one preamble of FIG. 11 is mapped to two (PUSCH resources, DM-RS ports) tuples. The difference from FIG. 9 is that two DM-RS ports are configured within each PUSCH resource of FIG. 11. The DM-RS selection manner in FIG. 7 is equally applicable to FIG. 11.. The rules for selecting group B in FIG. 9 are equally applicable to FIG. 11.
[0120]
​FIG. 12 is another example diagram of resource mapping according to an embodiment of the present invention. Different from FIG. 11, the PUSCH resource group A is mapped to a preamble different from the group B, that is, one preamble is mapped to one (PUSCH resource, DM-RS port) tuple.. By additionally configuring a greater number of preambles compared to FIG. 11, the collision probability may be further reduced. The selection mode of the DM-RS and the rule for selecting the group B are equally applicable to FIG. 12.
[0121]
​Since the network device may control the number of configured preambles and the number of (PUSCH resources, DM-RS ports), the network device may make the number of preambles and (PUSCH resources, DM-RS ports) equal in number, thereby implementing a mapping between the preamble and the (PUSCH resource, DM-RS port). Or the number of preambles may be configured to be less than the number of (PUSCH resources, DM-RS ports), so as to implement an one-to-to-one mapping of the preamble (PUSCH resource, DM-RS port), for example, it is possible to configure the number of (PUSCH resources, DM-RS ports) to be an integer multiple of the number of preambles.
[0122]
​In addition, the network device is not expected to configure the number of preambles greater than the number of (PUSCH resources, DM-RS ports); because in this case, even though different preambles are selected, it is still possible (PUSCH resources, DM-RS ports) to collide, and this collision is actually unnecessary and can be avoided by configuration.
[0123]
​If the network device does not control the number of preambles and the number of (PUSCH resources, DM-RS ports), that is, the number of preambles and the number of (PUSCH resources, DM-RS ports) is independently configured, some (PUSCH resources, DM-RS ports) or preambles may not be established, the one-to-one mapping relationship and one-to-many mapping relationship described above cannot be guaranteed, and at this time, the following mapping method may be used.
[0124]
​In one embodiment, one of the preambles is mapped to R (R ≥ 1) of the uplink data channel resources, and the preamble is mapped to P (P ≥ 1) demodulation reference signal ports within each of the uplink data channel resources. One of the preambles is mapped according to an ascending order of an index of the demodulation reference signal port in R uplink data channel resources; and then, in an ascending order of the frequency of the uplink data channel resource in R (R ≥ R) uplink data channel resources,
[0125]
​For example, a PUSCH resource included in one PUSCH occasion is configured, and a DM-RS port number allowed to be used in each PUSCH resource is configured as a P PUSCH opportunity to be configured to have a mapping relationship with N preamble resources. Each preamble is configured to map to R PUSCH resources, and the preamble is configured to map to P DM-RS ports within each PUSCH resource.
[0126]
​The preamble is mapped to a PUSCH resource and a DM-RS port according to the following order: firstly, an ascending order mapping is performed according to the DM-RS port in the R PUSCH resources; secondly, the sequence mapping is performed according to the PUSCH resource frequency in the R PUSCH resources.
[0127]
​In one embodiment, in the case that one tuple of the uplink data channel resource and the demodulation reference signal port is not mapped to the preamble, the tuple determination is not used for the first random access request. And/or when one of the preamble is not mapped to one tuple of the uplink data channel resource and the demodulation reference signal port, sending a second random access request including the preamble but not including the uplink data and the demodulation reference signal.
[0128]
​For example, if a certain (PUSCH resource, DM-RS port) tuple is not mapped and associated to a preamble, the tuple is not used for a two-step random access PUSCH transmission. If a preamble is not mapped and associated to a (PUSCH resource, DM-RS port) tuple, the preamble is not used for a preamble transmission of two-step random access, which may be used for a preamble transmission of four-step random access. For this mapping, the selection mode of the DM-RS and the rule for selecting the group B apply equally.
[0129]
​For the case where there is a packet in the PUSCH resource, a preamble may also be mapped to the preamble one by one, for example, a (PUSCH resource, a DM-RS port) in the group A is first mapped to the preamble, and then the (PUSCH resource, DM-RS port) in the group B is mapped to the preamble, and the mapping of the PUSCH resource, the DM-RS port to the preamble may use any one of the above mapping methods.
[0130]
​In one embodiment, the uplink data channel resource of the first group overlaps with the uplink data channel resource of the second group, and the overlapping uplink data channel resource is configured with different demodulation reference signal ports.
[0131]
​FIG. 13 is another example diagram of resource mapping according to an embodiment of the present disclosure, as shown in FIG. 13, a configured PUSCH resource group A and a group B may overlap, so that PUSCH resources may be saved.. Overlapping PUSCH resources are configured with different DM-RS ports.
[0132]
​In one embodiment, the preamble may be first mapped in one group; and then the plurality of groups are mapped in an ascending order of the group index. That is, the preamble may also be mapped one by one.
[0133]
​As shown in FIG. 13, a preamble may be mapped to a preamble one by one, for example, a (PUSCH resource, a DM-RS port) in group A is first mapped to a preamble, and then a (PUSCH resource, DM-RS port) in group B is mapped to a preamble, and a mapping of a PUSCH resource, a DM-RS port to a preamble may use any one of the foregoing mapping methods. FIG. 13 illustrates a mapping of a group by taking a resource overlap as an example, but the present invention is not limited thereto, and the above group mapping manner may also be used for multiple groups of PUSCH resources that do not overlap.
[0134]
​In one embodiment, one or more of the preambles are configured in at least one random access channel opportunity, one or more of the uplink data channel resources and one or more demodulation reference signal ports are configured in at least one uplink data channel opportunity.
[0135]
​There is also a mapping relationship between a PRACH opportunity and a PUSCH opportunity as a PUSCH occasion and a PRACH opportunity are defined. When there is an one-to-one mapping relationship between the PRACH opportunity and the PUSCH opportunity, the mapping relationship between the preamble and the PUSCH resource and the DM-RS port may be determined in the pair of PRACH opportunities and the PUSCH opportunities associated with the mapping relationship.. The method for selecting the DM-RS and the rule for selecting the group B are equally applicable.
[0136]
​In one embodiment, the preamble in one random access channel opportunity may be mapped to one uplink data channel opportunity; and the preamble is mapped in one of the uplink data channel opportunities, and then the one or more uplink data channel opportunities are mapped in ascending order of frequency.
[0137]
​For example, as an implementation, the mapping sequence of the preamble to the PUSCH resource and the DM-RS port may be expanded to: first map the PUSCH resources of the frequency division multiplexing within one PUSCH resource according to the ascending order of the DM-RS port index; and then map the frequency-division multiplexed PUSCH resources according to the ascending order of the frequency.
[0138]
​In one embodiment, the mapping sequence of the preamble to the PUSCH resource and the DM-RS port may also be expanded in an ascending order of the DM-RS port in an R (R ≥ 1) PUSCH resource in one PUSCH opportunity; then in one PUSCH opportunity, a sequence mapping of the PUSCH resource frequency in R (R ≥ R) PUSCH resources is performed; and then the frequency division multiplexed PUSCH opportunities are mapped according to the frequency increment order.
[0139]
​FIG. 14 is another example diagram of resource mapping according to an embodiment of the present invention. As shown in FIG. 14, a network device configures a PRACH opportunity and a PUSCH opportunity, where one PRACH opportunity is associated with one PUSCH opportunity. The network device configures several PUSCH resources and DM-RS ports in the PUSCH opportunity.
[0140]
​Within this pair of associated PRACH opportunities and PUSCH opportunities, the mapping of the preamble and PUSCH resources and DM-RS ports shown in FIG. 14 May be obtained according to the previously described mapping order.. Similarly, other mapping relationships can be obtained, and details are not described in detail.
[0141]
​In one embodiment, when configuring the uplink data channel resource within the uplink data channel opportunity, the relative position of the uplink data channel resource within the uplink data channel opportunity is indicated.
[0142]
​For example, because the PUSCH opportunity is configured, then the PUSCH resource is further configured in the time-frequency resource range included in the PUSCH opportunity, and for the frequency domain resource allocation of the PUSCH resource, the configuration signaling may actually use the PUSCH opportunity as a reference to indicate the relative position of the PUSCH resource within the PUSCH opportunity.. Since the indication is the relative position within the PUSCH opportunity, the signaling overhead can be greatly reduced compared to the conventional relative position in the entire bandwidth or Part of bandwidth (BWP, Band-Width, Part).
[0143]
​The network device may also configure multiple PRACH opportunities and multiple PUSCH opportunities, and the mapping between the preamble and the (PUSCH resource, DM-RS port) is determined according to the above manner within each pair of associated PRACH opportunities and PUSCH opportunities.
[0144]
​In one embodiment, the plurality of uplink data channel opportunities may be at least configured as a third group and a fourth group. A parameter of at least one of an uplink data channel opportunity of the third group is different from an uplink data channel opportunity of the fourth group: a size, a modulation mode, a code rate, a waveform, and a DM-RS configuration.
[0145]
​FIG. 15 is another example diagram of resource mapping according to an embodiment of the present invention, as shown in FIG. 15, two PRACH opportunities are respectively associated with two PUSCH opportunities, and in each pair of associated PRACH opportunities and PUSCH opportunities, a mapping between a preamble and a (PUSCH resource, a DM-RS port) may be determined according to a previous rule.. FIG. 15 also shows an embodiment in which the PUSCH resource group A and the group B are respectively located at different PUSCH opportunities.. The selection mode of the DM-RS and the rule for selecting the group B are equally applicable herein.
[0146]
​FIG. 16 is another example diagram of resource mapping according to an embodiment of the present invention, and mainly differs from FIG. 15 in that each PUSCH resource in FIG. 16 is configured with two DM-RS ports.. Within each pair of associated PRACH opportunities and PUSCH opportunities, the mapping of the preamble and (PUSCH resources, DM-RS ports) may be determined according to the previous rules. The selection mode of the DM-RS and the rule for selecting the group B apply equally.
[0147]
​In one embodiment, the mapping may further use the plurality of random access channel opportunities as one set of the preambles, and use the plurality of uplink data channel opportunities as one set of the uplink data channel resource and the demodulation reference signal port; and map the preamble in the preamble set to the set of the uplink data channel resource and the demodulation reference signal port.
[0148]
​For example, when multiple PRACH opportunities and multiple PUSCH opportunities are configured, one or more configured PRACH opportunities may be used as a large preamble set, one or more configured PUSCH opportunities may be used as a large (PUSCH resource, DM-RS port) set, and then a mapping of a preamble set to a (PUSCH resource, DM-RS port) set may be performed, and the mapping may use any one of the foregoing mapping methods.
[0149]
​As an implementation, the following mapping manner may be used. First, the configured one or more PRACH opportunities are used as a large preamble set, and one or more configured PUSCH opportunities are used as a large (PUSCH resource, DM-RS port) set.. Secondly, the preamble set and the (PUSCH resource, DM-RS port) set are sequentially mapped according to the DM-RS port, and then the frequency-division multiplexed PUSCH resources are mapped according to the frequency increment order.. The mapping of FIGS. 15 and 16 May likewise be obtained.
[0150]
​When multiple PRACH opportunities and multiple PUSCH opportunities are configured, as one implementation, the following mapping order may be used: the first, one or more PRACH opportunities configured as a large preamble set, and one or more configured PUSCH opportunities as a large (PUSCH resource, DM-RS port) set.. Secondly, the preamble set and the (PUSCH resource, DM-RS port) set are sequentially mapped in an ascending order of DM-RS ports in R (R > = 1) PUSCH resources, and then are mapped according to the sequence of ascending PUSCH resource frequency in R (R > = R) PUSCH resources; and the selection mode of DM-RS and the rule for selecting group B are equally applicable.
[0151]
​Regardless of which mapping method is used, an one-to-one relationship between a preamble (PUSCH resource and a DM-RS port) is used as an example for description, for example, a preamble in a certain time interval is mapped to a (PUSCH resource, a DM-RS port) in a certain time interval.
[0152]
​In one embodiment, in the case that the preamble within one time interval can be mapped to the uplink data channel resource and the tuple of the demodulation reference signal port within a plurality of time intervals, the mapping further proceeds to the tuple in the plurality of time intervals according to a time increment order.
[0153]
​For example, when a preamble in a certain slot may be mapped to a (PUSCH resource, a DM-RS port) in a plurality of time slots, on the basis of any one of the foregoing mapping methods, a plurality of time division multiplexing (PUSCH resources, DM-RS ports) may be mapped according to a time increment order. The time interval may refer to a time range sent by one preamble or one PUSCH, and may be one or more time slots.
[0154]
​Regardless of which mapping method is used, when a PRACH opportunity, a configuration (PUSCH resource, a DM-RS port) is configured, a PUSCH opportunity is configured, and when a PUSCH opportunity is configured, a slot or a symbol that may appear to be configured to transmit a preamble, a PUSCH, and a DM-RS is unavailable.
[0155]
​In one embodiment, when the preamble is available but the uplink data channel resource and the demodulation reference signal port are not available, the terminal device sends a second random access request including the preamble without including the uplink data and the demodulation reference signal; and in the case that the preamble is unavailable, the terminal device determines not to send the first random access request and the second random access request.
[0156]
​For example, a group of symbols of a certain slot is downlink or free (or referred to as a flexible, flexible) symbol, or the terminal device needs to cancel the preamble transmission or cancel the PUSCH transmission on a group of symbols of a certain time slot, and at this time, it is considered that the slot or symbol is unavailable.. For a specific terminal device to cancel the condition of preamble and/or PUSCH transmission, see section 11.1 of TS 38.213, and details are not described herein again.
[0157]
​When the time slot or symbol where the PUSCH is located is unavailable, but the time slot or symbol of the preamble associated with the PUSCH is available, the terminal device may still send the preamble using the slot or symbol in which the preamble is located, and at this time, the terminal device randomly accesses the preamble as a conventional four-step random access, which is equivalent to the terminal device switching from two-step random access to four-step random access.
[0158]
​When the time slot or symbol in which the current pilot is located is unavailable, even if the slot or symbol in which the PUSCH associated therewith is located is available, the terminal device does not perform random access using the PUSCH slot or symbol.. When the time slots or symbols in which the current pilot and the PUSCH are located are not available, the terminal device does not use these time slots for random access.
[0159]
​A schematic illustration of mapping is performed according to a given rule, that is, these mapping schemes are implicitly configured. The embodiments of the present invention may also be configured explicitly.
[0160]
​In one embodiment, when the network device configures the uplink data channel resource, it is further configured to configure a demodulation reference signal port associated with the uplink data channel resource, and configure a preamble and/or a random access opportunity associated with the uplink data channel resource and the demodulation reference signal port.
[0161]
​For example, when the network device configures the PUSCH resource for the terminal device, the terminal device configures the DM-RS port associated with the PUSCH resource, and configures the preamble index and/or the PRACH opportunity index associated with the PUSCH resource (the PUSCH resource, the DM-RS port).
[0162]
​In one embodiment, at least two uplink data channel resources may be multiplexed in one resource block (RB).
[0163]
​For example, the size of the PUSCH resource associated with a certain preamble may be less than one RB according to the size of the MSGB. When the size of the PUSCH resource is less than 1 RB, different PUSCH resources may be multiplexed in one RB, and non-overlapping REs are used. In addition, in order for different PUSCH resources to have the same or similar size, the PUSCH resources may be determined by using an alternating mapping manner.
[0164]
​In one embodiment, the at least two uplink data channel resources are associated with different demodulation reference signal ports (eg, DM-RS port 0 and DM-RS port 2, but the present invention is not limited thereto); and the at least two uplink data channel resources are alternately mapped to resource particles (RE) according to the order of the first frequency domain rear time domain.
[0165]
​FIG. 17 is a schematic diagram of a time-frequency resource according to an embodiment of the present disclosure, as shown in FIG. 17, two PUSCH resources are multiplexed by one RB, and the two PUSCH resources are associated with the DM-RS port 0 and the port 2 respectively, so that the two PUSCH resources have the same size, and the PUSCH resource may be determined using an alternating mapping manner.. In FIG. 17, the REs occupied by the PUSCH resource associated with the DM-RS port 0 are marked as "0", and the REs occupied by the PUSCH resource associated with the DM-RS port 2 are marked as "2", and the symbol where the DM-RS is located is avoided during mapping.
[0166]
​By alternately mapping, the PUSCH resources multiplexed in one RB have the same or similar size, and the PUSCH resources are dispersed into the whole RB, since the REs where the DM-RS are located are also dispersed in the RB, the PUSCH resources can obtain the benefits brought by the DM-RS channel estimation.
[0167]
​In one embodiment, when the uplink data channel resource overlaps with the preamble in the frequency domain, channel estimation may be performed on the uplink data using the preamble.
[0168]
​For example, when the PUSCH resource overlaps with the resource (ie, the PRACH opportunity) in the frequency domain, the channel estimation of the preamble-assisted PUSCH may be used, for example, the preamble is used as a reference signal to perform channel estimation, so that the channel estimation performance is improved, and the demodulation and decoding performance is improved.
[0169]
​In one embodiment, a first size of the uplink data channel resource that does not overlap the preamble may be configured to be greater than a second size of the uplink data channel resource overlapping the preamble.
[0170]
​For example, when the PUSCH resource does not overlap with the resource where the preamble is located, the channel estimation of the PUSCH cannot obtain a preamble, in order to obtain the decoding performance similar to other overlapping PUSCH resources, the size of the non-overlapping PUSCH resource can be configured to be larger, so that the code rate is reduced, thereby increasing the decoding performance when the PUSCH resource is close to the preamble auxiliary channel estimation.
[0171]
​In one embodiment, the mapping may be performed from a lowest frequency with an uplink data channel resource overlapping the preamble, in a direction increasing in frequency
[0172]
​For example, in order to utilize the auxiliary function of the preamble to estimate the channel, when the preamble is mapped to the PUSCH resource, the PUSCH resource with the lowest frequency domain that coincides with the preamble may be mapped from the lowest frequency domain, and then the other PUSCH resources are mapped along the frequency increase direction, and when the highest frequency is reached, the cyclic mapping is performed, that is, the PUSCH resource with the lowest frequency domain that does not coincide with the preamble.
[0173]
​In one embodiment, the demodulation reference signal may also be used to estimate a Timing Advance (TA) of the terminal device.
[0174]
​For example, the DM-RS sequence may also be used as a TA estimate. When one preamble is mapped to multiple (PUSCH resources, DM-RS ports), if multiple terminal devices select the same preamble, different (PUSCH resources, DM-RS ports) are selected, and the network device cannot distinguish the TA of different terminal devices through the preamble, but the network device can estimate the TA of different terminal devices through the DM-RS sequence due to different terminal devices using different DM-RS ports.
[0175]
​In the embodiment of the present invention, there is no limitation on the positions of different PUSCH resources.. FIG. 18 is another example diagram of resource mapping according to an embodiment of the present disclosure, and as shown in FIG. 18, PUSCH resources of different sizes may be alternately configured in frequency domain.
[0176]
​The above embodiments are merely illustrative for the embodiments of the present disclosure, but the present disclosure is not limited thereto, and appropriate modifications may be made on the basis of the above embodiments.. For example, the above embodiments may be used alone, or one or more of the above embodiments may be combined.
[0177]
​It can be seen from the above embodiments that the mapping of the preamble to the uplink data channel resource and the demodulation reference signal port is implicitly configured or explicitly configured by the network device according to the configuration information; therefore, the mapping relationship between the preamble and the uplink data resource and the DM-RS port can be determined, and the network device can immediately obtain the PUSCH and the DM-RS information associated therewith based on the received preamble, so that the random access performance can be improved, and sufficient configuration flexibility can be provided.
[0178]
​Embodiment 2
[0179]
​An embodiment of the present invention provides a random access method, which is described from a network device side. The same contents of Embodiment 2 and Embodiment 1 are not repeated herein.
[0180]
​FIG. 19 is a schematic diagram of a resource configuration method according to an embodiment of the present disclosure, as shown in FIG. 19, the method includes:
[0181]
​Step 1901: The network device receives a first random access request including at least a preamble, an uplink data, and a demodulation reference signal sent by a terminal device; wherein the mapping of the uplink data channel resource of the preamble to the uplink data and the demodulation reference signal port of the demodulation reference signal is determined according to configuration information or configured by the network device; and
[0182]
​Step 1902: The network device sends a random access response to the terminal device.
[0183]
​In one embodiment, one of the preambles is mapped to at least one tuple of the uplink data channel resource and the demodulation reference signal port, and one uplink data channel resource is at least configured with one demodulation reference signal port.
[0184]
​In one embodiment, the preamble is mapped as follows: firstly, one or more demodulation reference signal ports of one uplink data channel resource are performed in an ascending order of indexes, and then the one or more uplink data channel resources are performed in ascending order of frequency
[0185]
​In one embodiment, when the network device configures the uplink data channel resource for the terminal device, the network device further configures a demodulation reference signal port associated with the uplink data channel resource, and configures a preamble and/or a random access opportunity associated with the uplink data channel resource and the demodulation reference signal port.
[0186]
​It should be noted that, FIG. 19 and FIG. 19 are merely schematic illustrations of the embodiments of the present disclosure, but the present disclosure is not limited thereto. For example, the order of execution between the various steps may be appropriately adjusted, and in addition, some other steps may be added, or some of the steps therein May be reduced. Those skilled in the art may make appropriate variations according to the above-mentioned content, but are not limited to the disclosure of FIG. 19.
[0187]
​The above embodiments are merely illustrative for the embodiments of the present disclosure, but the present disclosure is not limited thereto, and appropriate modifications may be made on the basis of the above embodiments.. For example, the above embodiments may be used alone, or one or more of the above embodiments may be combined.
[0188]
​It can be seen from the above embodiments that the mapping of the preamble to the uplink data channel resource and the demodulation reference signal port is implicitly configured or explicitly configured by the network device according to the configuration information; therefore, the mapping relationship between the preamble and the uplink data resource and the DM-RS port can be determined, and the network device can immediately obtain the PUSCH and the DM-RS information associated therewith based on the received preamble, so that the random access performance can be improved, and sufficient configuration flexibility can be provided.
[0189]
​Embodiment 3
[0190]
​An embodiment of the present invention provides a random access device. The apparatus may be, for example, a terminal device, or may be some or some components or components configured on a terminal device. The same contents of Embodiment 3 and Embodiment 1 are not repeated herein.
[0191]
​FIG. 20 is a schematic diagram of a random access device according to an embodiment of the present disclosure, as shown in FIG. 20, the random access device 2000 includes:
[0192]
​a request sending unit 2001, configured to send a first random access request comprising at least a preamble, an uplink data and a demodulation reference signal to a network device; wherein the mapping of the uplink data channel resource of the preamble to the uplink data and the demodulation reference signal port of the demodulation reference signal is determined according to configuration information or configured by the network device; and
[0193]
​A response receiving unit 2002 receives a random access response sent by the network device
[0194]
​As shown in FIG. 20, the random access device 2000 May further include:
[0195]
​a configuration receiving unit 2003, which receives the preamble sent by the network device, the uplink data channel resource, and configuration information of the demodulation reference signal port; and the request sending unit 2001 May implicitly determine the mapping according to the configuration information.
[0196]
​In one embodiment, the configuration receiving unit 2003 May further receive the mapping configuration of the preamble sent by the network device to the uplink data channel resource and the demodulation reference signal port; and the request sending unit 2001 May explicitly determine the mapping according to the mapping configuration.
[0197]
​In one embodiment, one of the preambles is mapped to at least one tuple of the uplink data channel resource and the demodulation reference signal port, and one uplink data channel resource is at least configured with one demodulation reference signal port.
[0198]
​In one embodiment, the preamble is mapped as follows: firstly, one or more demodulation reference signal ports of one uplink data channel resource are performed in an ascending order of indexes, and then the one or more uplink data channel resources are performed in ascending order of frequency.
[0199]
​In one embodiment, one of the preambles is mapped to R (R ≥ 1) of the uplink data channel resources, and the preamble is mapped to P (P ≥ 1) demodulation reference signal ports within each of the uplink data channel resources;
[0200]
​A preamble is mapped according to an ascending order of an index of the demodulation reference signal port in R uplink data channel resources; and then, in an ascending order of the frequency of the uplink data channel resource in R (R ≥ R) uplink data channel resources,
[0201]
​In one embodiment, in the case that one tuple of the uplink data channel resource and the demodulation reference signal port is not mapped to the preamble, the tuple determination is not used for the first random access request; and/or
[0202]
​transmitting a second random access request including the preamble but not including the uplink data and the demodulation reference signal if one of the preamble is not mapped to one tuple of the uplink data channel resource and the demodulation reference signal port.
[0203]
​In one embodiment, one of the uplink data channel resources is configured with a first demodulation reference signal port and a second demodulation reference signal port that are frequency division multiplexed, wherein the first demodulation reference signal port and the second demodulation reference signal port occupy all subcarriers in a frequency domain in one resource block.
[0204]
​In one embodiment, one of the uplink data channel resources is configured with a third demodulation reference signal port and a fourth demodulation reference signal port that are code division multiplexed;
[0205]
​In one embodiment, in the case that the uplink data uses an orthogonal frequency division multiplexing waveform, a frequency division multiplexing first demodulation reference signal port and a second demodulation reference signal port are used.
[0206]
​In the case that the uplink data uses a discrete Fourier transform to expand the orthogonal frequency division multiplexing waveform, a third demodulation reference signal port and a fourth demodulation reference signal port of code division multiplexing are used.
[0207]
​In one embodiment, the plurality of uplink data channel resources are at least configured as a first group and a second group, and one uplink data channel resource is at least configured with one demodulation reference signal port.
[0208]
​The parameter of at least one of the following parameters of the uplink data channel resource of the first group is different from the uplink data channel resource of the second group: size, modulation mode, code rate, waveform, demodulation reference signal configuration.
[0209]
​In one embodiment, under at least one of the following conditions, uplink data channel resources of the second group having a larger size are selected:
[0210]
​the random access request is directed to a common control channel, and a size of a service data unit of the common control channel plus a medium access control sub-header is greater than a first threshold;
[0211]
​a size of the random access request is greater than a second threshold, and/or a path loss and/or a reference signal receiving power of the random access request is less than a third threshold;
[0212]
​the terminal device is in a radio resource control connection state, and has user plane data to be sent;
[0213]
​a block error rate of a transmission of an uplink data channel is greater than a fourth threshold;
[0214]
​the reference signal receiving power is less than the fifth threshold;
[0215]
​A signal-to-noise ratio or a signal-to-noise ratio is less than a sixth threshold.
[0216]
​In one embodiment, a preamble mapped by an uplink data channel resource of the first group is the same as a preamble mapped by an uplink data channel resource of the second group.. Alternatively, the preamble mapped by the uplink data channel resource of the first group is different from the preamble mapped by the uplink data channel resource of the second group.
[0217]
​In one embodiment, the uplink data channel resource of the first group overlaps with the uplink data channel resource of the second group, and the overlapping uplink data channel resource is configured with different demodulation reference signal ports.
[0218]
​In one embodiment, the preamble is mapped first in one group; and the multiple groups are mapped according to the ascending order of the group index
[0219]
​In one embodiment, one or more of the preambles are configured in at least one random access channel opportunity, one or more of the uplink data channel resources and one or more demodulation reference signal ports are configured in at least one uplink data channel opportunity;
[0220]
​wherein the preamble in one random access channel opportunity is mapped to one uplink data channel opportunity; and the preamble is mapped in one of the uplink data channel opportunities, and then the one or more uplink data channel opportunities are mapped according to the ascending order of frequency.
[0221]
​In one embodiment, when configuring the uplink data channel resource within the uplink data channel opportunity, the relative position of the uplink data channel resource within the uplink data channel opportunity is indicated.
[0222]
​In one embodiment, the plurality of uplink data channel opportunities are at least configured as a third group and a fourth group, wherein a parameter of at least one of the following uplink data channel opportunities is different from an uplink data channel opportunity of the fourth group: a size, a modulation mode, a code rate, a waveform, and a demodulation reference signal configuration.
[0223]
​In one embodiment, the mapping further uses the plurality of random access channel opportunities as one set of the preambles, and uses the plurality of uplink data channel opportunities as one set of the uplink data channel resource and the demodulation reference signal port.
[0224]
​In one embodiment, in the case that the preamble within one time interval can be mapped to the uplink data channel resource and the tuple of the demodulation reference signal port within a plurality of time intervals, the mapping further proceeds to the tuple in the plurality of time intervals according to a time increment order.
[0225]
​In one embodiment, the request sending unit 2001 May further be configured to: when the preamble is available but the uplink data channel resource and the demodulation reference signal port are unavailable, send a second random access request including the preamble without including the uplink data and the demodulation reference signal; and when the preamble is unavailable, determine not to send the first random access request and the second random access request.
[0226]
​In one embodiment, when the uplink data channel resource is configured by a network device, a demodulation reference signal port associated with the uplink data channel resource is configured, and a preamble and/or a random access opportunity associated with the uplink data channel resource and the demodulation reference signal port are also configured.
[0227]
​In one embodiment, at least two uplink data channel resources are multiplexed in one resource block;
[0228]
​wherein the at least two uplink data channel resources are associated with different demodulation reference signal ports; and the at least two uplink data channel resources are alternately mapped to resource particles (RE) according to the order of the first frequency domain rear time domain.
[0229]
​In one embodiment, when the uplink data channel resource overlaps with the preamble in the frequency domain, channel estimation is performed on the uplink data by using the preamble.
[0230]
​In one embodiment, a first size of the uplink data channel resource that does not overlap the preamble is configured to be greater than a second size of the uplink data channel resource overlapping the preamble.
[0231]
​In one embodiment, the demodulation reference signal is further used to estimate a timing advance of the terminal device.
[0232]
​In one embodiment, the mapping starts from a lowest frequency with an uplink data channel resource overlapping the preamble and is performed in a direction increasing in frequency
[0233]
​It should be noted that only the components or modules related to the present disclosure are described above, but the present disclosure is not limited thereto.. The random access device 2000 May further include other components or modules, and the random access device 2000 May refer to related technologies.
[0234]
​In addition, for the sake of simplicity, only the connection relationship or signal trend between the various components or modules is shown in FIG. 20, but it should be clear to a person skilled in the art that various related technologies such as bus connections may be used.. The foregoing components or modules may be implemented by hardware facilities such as a processor, a memory, a transmitter, a receiver, and the embodiments of the present disclosure are not limited thereto.
[0235]
​It can be seen from the above embodiments that the mapping of the preamble to the uplink data channel resource and the demodulation reference signal port is implicitly configured or explicitly configured by the network device according to the configuration information; therefore, the mapping relationship between the preamble and the uplink data resource and the DM-RS port can be determined, and the network device can immediately obtain the PUSCH and the DM-RS information associated therewith based on the received preamble, so that the random access performance can be improved, and sufficient configuration flexibility can be provided.
[0236]
​Embodiment 4
[0237]
​An embodiment of the present invention provides a random access device. The apparatus may be, for example, a network device, or may be some or some components or components configured on a network device. The same contents of Embodiment 4 and Examples 1 and 2 are not repeated herein.
[0238]
​FIG. 21 is a schematic diagram of a random access device according to an embodiment of the present disclosure, as shown in FIG. 21, the random access device 2100 includes:
[0239]
​a request receiving unit 2101, configured to receive a first random access request sent by the terminal device at least comprising a preamble, an uplink data, and a demodulation reference signal; wherein the mapping of the uplink data channel resource of the preamble to the uplink data and the demodulation reference signal port of the demodulation reference signal is determined according to configuration information or configured by the network device; and
[0240]
​In response to the sending unit 2102, the response sending unit 2102 sends a random access response to the terminal device
[0241]
​As shown in FIG. 21, the random access device 2100 May further include:
[0242]
​a configuration sending unit 2103, configured to send, to the terminal device, configuration information of the preamble, the uplink data channel resource, and the demodulation reference signal port.
[0243]
​In one embodiment, the configuration sending unit 2103 May further configure, for the terminal device, the mapping of the preamble to the uplink data channel resource and the demodulation reference signal port.
[0244]
​In one embodiment, one of the preambles is mapped to at least one tuple of the uplink data channel resource and the demodulation reference signal port, and one uplink data channel resource is at least configured with one demodulation reference signal port.
[0245]
​In one embodiment, the preamble is mapped as follows: firstly, one or more demodulation reference signal ports of one uplink data channel resource are performed in an ascending order of indexes, and then the one or more uplink data channel resources are performed in ascending order of frequency
[0246]
​In one embodiment, when the network device configures the uplink data channel resource for the terminal device, the network device further configures a demodulation reference signal port associated with the uplink data channel resource, and configures a preamble and/or a random access opportunity associated with the uplink data channel resource and the demodulation reference signal port.
[0247]
​It should be noted that only the components or modules related to the present disclosure are described above, but the present disclosure is not limited thereto.. The random access device 2100 May further include other components or modules, and the random access device 2100 May refer to related technologies.
[0248]
​In addition, for the sake of simplicity, only the connection relationship or signal trend between the various components or modules is shown in FIG. 21, but it should be clear to those skilled in the art that various related technologies such as bus connections may be used. The foregoing components or modules may be implemented by hardware facilities such as a processor, a memory, a transmitter, a receiver, and the embodiments of the present disclosure are not limited thereto.
[0249]
​It can be seen from the above embodiments that the mapping of the preamble to the uplink data channel resource and the demodulation reference signal port is implicitly configured or explicitly configured by the network device according to the configuration information; therefore, the mapping relationship between the preamble and the uplink data resource and the DM-RS port can be determined, and the network device can immediately obtain the PUSCH and the DM-RS information associated therewith based on the received preamble, so that the random access performance can be improved, and sufficient configuration flexibility can be provided.
[0250]
​Embodiment 5
[0251]
​An embodiment of the present invention further provides a communication system, which may refer to FIG. 3, and the same contents as those in the embodiments 1 to 4 are not repeated herein.. In this embodiment, the communication system 100 May include:
[0252]
​a terminal device 102, configured to send a first random access request comprising at least a preamble, an uplink data and a demodulation reference signal to a network device 101; and receive a random access response sent by the network device 101;
[0253]
​a network device 101, which receives the first random access request and sends the random access response to the terminal device 102; wherein the mapping of the uplink data channel resource of the preamble to the uplink data and the demodulation reference signal port of the demodulation reference signal is determined according to configuration information from the network device or configured by the network device 101.
[0254]
​Embodiments of the present disclosure further provide a network device, for example, may be a base station, but the present disclosure is not limited thereto, or may be other network devices.
[0255]
​FIG. 22 is a schematic structural diagram of a network device according to an embodiment of the present invention. As shown in FIG. 22, the network device 2200 May include a processor 2210 (eg, a central processing unit CPU) and a memory 2220; a memory 2220 coupled to the processor 2210, where the memory 2220 can store various data, and also stores information processing programs 2230, and executes the program 2230 under the control of the processor 2210
[0256]
​For example, the processor 2210 May be configured to execute a program to implement the random access method according to embodiment 2.. For example, the processor 2210 May be configured to: receive a first random access request including at least a preamble, an uplink data and a demodulation reference signal sent by the terminal device; and send a random access response to the terminal device, wherein the mapping of the uplink data channel resource of the preamble to the uplink data and the demodulation reference signal port of the demodulation reference signal is determined according to configuration information from the network device or configured by the network device 101.
[0257]
​In addition, as shown in FIG. 22, the network device 2200 May further include a transceiver 2240 and an antenna 2250. The functions of the foregoing components are similar to those of the prior art, and details are not described herein again.. It should be noted that the network device 2200 is not necessarily all the components shown in FIG. 22; in addition, the network device 2200 May further include the components not shown in FIG. 22, and may refer to the prior art.
[0258]
​Embodiments of the present disclosure further provide a terminal device, but the present disclosure is not limited thereto, and may also be another device.
[0259]
​FIG. 23 is a schematic diagram of a terminal device according to an embodiment of the present invention.. As shown in FIG. 23, the terminal device 2300 May include a processor 2310 and a memory 2320; the memory 2320 stores data and programs, and is coupled to the processor 2310 to note that the diagram is exemplary; other types of structures may also be used to supplement or replace the structure to implement telecommunication functions or other functions.
[0260]
​For example, the processor 2310 May be configured to execute a program to implement the random access method according to Embodiment 1.. For example, the processor 2310 May be configured to: send a first random access request comprising at least a preamble, an uplink data, and a demodulation reference signal to a network device; wherein the mapping of the uplink data channel resource of the preamble to the uplink data and the demodulation reference signal port of the demodulation reference signal is determined according to configuration information from the network device or configured by the network device 101; and receiving a random access response sent by the network device.
[0261]
​As shown in FIG. 23, the terminal device 2300 May further include a communication module 2330, an input unit 2340, a display 2350, and a power supply 2360. The functions of the foregoing components are similar to those of the prior art, and details are not described herein again.. It should be noted that the terminal device 2300 is not necessarily all of the components shown in FIG. 23, and the foregoing components are not required; in addition, the terminal device 2300 May further include the components not shown in FIG. 23, and may refer to the prior art.
[0262]
​An embodiment of the present invention further provides a computer program, wherein when the program is executed in a terminal device, the program causes the terminal device to perform the random access method according to Embodiment 1.
[0263]
​An embodiment of the present invention further provides a storage medium storing a computer program, wherein the computer program causes the terminal device to perform the random access method according to Embodiment 1.
[0264]
​An embodiment of the present invention further provides a computer program, wherein when the program is executed in a network device, the program causes the network device to perform the random access method according to Embodiment 2.
[0265]
​An embodiment of the present invention further provides a storage medium storing a computer program, wherein the computer program causes the network device to perform the random access method according to Embodiment 2.
[0266]
​The above apparatus and method of the present invention may be implemented by hardware, or may be implemented by hardware in combination with software. The present invention relates to a computer readable program that, when executed by a logic component, enables the logic to implement the apparatus or constituent components described above, or to enable the logic to implement the various methods or steps described above.. The present invention also relates to a storage medium for storing the above program, such as a hard disk, a magnetic disk, an optical disk, a DVD, a Flash memory, etc.
[0267]
​The method/apparatus described in connection with the embodiments of the present invention may be embodied directly as hardware, a software module executed by a processor, or a combination of the two. For example, one or more combinations of one or more of the functional blocks shown in the figures and/or functional block diagrams may correspond to various software modules of a computer program flow, or may correspond to various hardware modules. These software modules may correspond to the various steps shown in the figures, respectively. These hardware modules may, for example, be implemented using a field programmable gate array (FPGA) to cure these software modules.
[0268]
​A software module may be located in RAM memory, flash memory, ROM memory, EPROM memory, EEPROM memory, registers, hard disk, a removable disk, a CD-ROM, or any other form of storage medium known in the art. A storage medium may be coupled to the processor, so that the processor can read information from the storage medium and write information to the storage medium; or the storage medium may be an integral part of the processor. The processor and the storage medium may be located in an ASIC. The software module may be stored in a memory of the mobile terminal, or may be stored in a memory card that can be inserted into the mobile terminal.​For example, if a device (such as a mobile terminal) uses a MEGA-SIM card with a larger capacity or a flash memory device with a large capacity, the software module may be stored in the MEGA-SIM card or a large-capacity flash memory device.
[0269]
​For one or more combinations of one or more and/or functional blocks in the functional blocks described in the figures, a general-purpose processor, a digital signal processor (DSP), an application-specific integrated circuit (ASIC), a field programmable gate array (FPGA), or other programmable logic device, discrete gate or transistor logic device, discrete hardware components, or any suitable combination thereof, may be implemented for performing the functions described herein. One or more combinations of one or more and/or functional blocks in the functional blocks described with respect to the figures may also be implemented as a combination of computing devices, eg, a combination of a DSP and a microprocessor, a plurality of microprocessors, one or more microprocessors in communication with a DSP, or any other such configuration.
[0270]
​The present invention has been described above in conjunction with specific embodiments, but it should be clear to those skilled in the art that these descriptions are exemplary and are not intended to limit the scope of the present invention.. Various variations and modifications can be made to the invention by those skilled in the art in accordance with the spirit and principles of the invention, which are also within the scope of the invention.
[0271]
​With regard to the embodiments comprising the above embodiments, the following additional features are also disclosed:
[0272]
​Annex 1, a random access method, comprising:
[0273]
​sending, by a terminal device, a first random access request comprising at least a preamble, an uplink data, and a demodulation reference signal to a network device; wherein the mapping of the uplink data channel resource of the preamble to the uplink data and the demodulation reference signal port of the demodulation reference signal is determined according to configuration information from the network device or configured by the network device; and
[0274]
​Receiving a random access response sent by the network device
[0275]
​The method according to claim 1, wherein one of the preambles is mapped to at least one tuple of the uplink data channel resource and the demodulation reference signal port, and one uplink data channel resource is at least configured with one demodulation reference signal port.
[0276]
​The method according to claim 1 or 2, wherein the preamble is mapped according to an ascending order of an index of one or more demodulation reference signal ports of one uplink data channel resource, and then the one or more uplink data channel resources are performed in ascending order of frequency.
[0277]
​The method according to Annex 1 or 2, wherein one of the preambles is mapped to R (R ≥ 1) of the uplink data channel resources, and the preamble in each of the uplink data channel resources is mapped to P (P ≥ 1) demodulation reference signal ports;
[0278]
​A preamble is mapped according to an ascending order of an index of the demodulation reference signal port in R uplink data channel resources; and then, in an ascending order of the frequency of the uplink data channel resource in R (R ≥ R) uplink data channel resources,
[0279]
​The method of claim 4, wherein the tuple determination is not used for the first random access request if one tuple of the uplink data channel resource and the demodulation reference signal port is not mapped to the preamble; and/or
[0280]
​transmitting a second random access request including the preamble but not including the uplink data and the demodulation reference signal if one of the preamble is not mapped to one tuple of the uplink data channel resource and the demodulation reference signal port.
[0281]
​The method according to any one of the appended claims 1 to 5, wherein one of the uplink data channel resources is configured with a first demodulation reference signal port and a second demodulation reference signal port (eg, DM-RS port 0 and DM-RS port 2) that are frequency division multiplexed.
[0282]
​The method according to Annex 6, wherein the first demodulation reference signal port and the second demodulation reference signal port (eg, DM-RS port 0 and DM-RS port 2) occupy all (12) subcarriers in a frequency domain in one resource block (demodulation reference signal configuration type 1 is used).
[0283]
​The method according to any one of the appended claims 1 to 5, wherein one of the uplink data channel resources is configured with a third demodulation reference signal port and a fourth demodulation reference signal port (eg, DM-RS port 0 and DM-RS port 1) that are code division multiplexed.
[0284]
​The method according to any one of the appended claims 1 to 8, wherein the frequency division multiplexing first demodulation reference signal port and the second demodulation reference signal port (eg DM-RS port 0 and DM-RS port 2) are used in the case that the uplink data uses an orthogonal frequency division multiplexing (OFDM) waveform;
[0285]
​In the case that the DFT-S-OFDM waveform is used for the uplink data, the third demodulation reference signal port and the fourth demodulation reference signal port (for example, the DM-RS port 0 and the DM-RS port 1) of the code division multiplexing are used.
[0286]
​The method according to any one of the appended claims 1 to 9, wherein the plurality of uplink data channel resources are at least configured as a first group and a second group, and one uplink data channel resource is at least configured with one demodulation reference signal port.
[0287]
​The method according to claim 10, wherein a parameter of at least one of an uplink data channel resource of the first group and an uplink data channel resource of the second group is different from a size, a modulation mode, a code rate, a waveform, and a DM-RS configuration.
[0288]
​The method according to claim 11, wherein the uplink data channel resource of the second group has a larger size or a lower modulation mode than the uplink data channel resource of the first group, and under the condition that at least one of the following conditions, the uplink data channel resource of the second group is selected:
[0289]
​The random access request is directed to a common control channel, and a size of a service data unit (SDU) of the common control channel plus a medium access control (MAC) subheader is greater than a first threshold;
[0290]
​a size of the random access request is greater than a second threshold, and/or a path loss and/or a reference signal receiving power of the random access request is less than a third threshold;
[0291]
​the terminal device is in a radio resource control (RRC) connection state, and has user plane data to be sent;
[0292]
​a block error rate (BLER) of a transmission of an uplink data channel is greater than a fourth threshold;
[0293]
​A reference signal received power (RSRP) is less than a fifth threshold;
[0294]
​A signal-to-noise ratio (SNR) or signal-to-noise ratio (SINR) is less than a sixth threshold.
[0295]
​The method according to any one of claims 10 to 12, wherein a preamble mapped by an uplink data channel resource of the first group is different from a preamble mapped by an uplink data channel resource of the second group.
[0296]
​The method according to any one of the appended claims 10 to 12, wherein a preamble mapped by an uplink data channel resource of the first group is the same as a preamble mapped by an uplink data channel resource of the second group.
[0297]
​The method according to any one of Figures 10 to 14, wherein the uplink data channel resource of the first group overlaps with the uplink data channel resource of the second group, and the overlapping uplink data channel resource is configured with different demodulation reference signal ports.
[0298]
​The method according to any one of the appended claims 10 to 15, wherein the preamble is mapped in one group, and then the plurality of groups are mapped according to the ascending order of the group index.
[0299]
​The method of any of clauses 1 to 16, wherein one or more of the preambles are configured in at least one random access channel opportunity, one or more of the uplink data channel resources and one or more demodulation reference signal ports are configured in at least one uplink data channel opportunity.
[0300]
​The method according to claim 17, wherein the preamble in one random access channel opportunity is mapped to one uplink data channel opportunity; and the preamble is mapped in one of the uplink data channel opportunities, and then the one or more uplink data channel opportunities are mapped in ascending order of frequency.
[0301]
​The method according to Annex 17 or 18, wherein when the uplink data channel resource in the uplink data channel opportunity is configured, the relative position of the uplink data channel resource in the uplink data channel opportunity is indicated.
[0302]
​The method according to any one of the appended claims 17 to 19, wherein the plurality of uplink data channel opportunities are at least configured as a third group and a fourth group.
[0303]
​The method according to claim 20, wherein a parameter of at least one of the following: a size, a modulation mode, a code rate, a waveform, and a DM-RS configuration is different from at least one of the following: a size, a modulation mode, a code rate, a waveform, and a DM-RS configuration.
[0304]
​The method according to any one of the appended claims 17 to 21, wherein the mapping further uses the plurality of random access channel opportunities as one set of the preambles, and uses the plurality of uplink data channel opportunities as one set of the uplink data channel resource and the demodulation reference signal port; and mapping a preamble in the preamble set to a set of the uplink data channel resource and the demodulation reference signal port.
[0305]
​The method according to any one of the appended claims 1 to 22, wherein in the case that the preamble in one time interval can be mapped to the uplink data channel resource and the tuple of the demodulation reference signal port within a plurality of time intervals, the mapping further proceeds to the tuple in the plurality of time intervals according to a time increment order.
[0306]
​The method according to any one of the appended claims 1 to 23, wherein the method further comprises:
[0307]
​when the preamble is available but the uplink data channel resource and the demodulation reference signal port are not available, the terminal device sending a second random access request including the preamble and not including the uplink data and the demodulation reference signal;
[0308]
​In the case that the preamble is unavailable, the terminal device determines not to send the first random access request and the second random access request.
[0309]
​The method according to Annex 1 or 2, wherein the method further comprises:
[0310]
​When the uplink data channel resource is configured by the network device, a demodulation reference signal port associated with the uplink data channel resource is configured, and a preamble and/or a random access opportunity associated with the uplink data channel resource and the demodulation reference signal port are also configured.
[0311]
​The method according to any one of the appended claims 1 to 25, wherein at least two uplink data channel resources are multiplexed in one resource block (RB).
[0312]
​The method according to claim 26, wherein the at least two uplink data channel resources are associated with different demodulation reference signal ports; and the at least two uplink data channel resources are alternately mapped to resource particles (RE) according to the order of the first frequency domain rear time domain.
[0313]
​The method according to any one of the appended claims 1 to 27, wherein when the uplink data channel resource overlaps with the preamble in the frequency domain, channel estimation is performed on the uplink data by using the preamble.
[0314]
​The method according to any one of the appended claims 1 to 27, wherein a first size of the uplink data channel resource that does not overlap with the preamble is configured to be greater than a second size of the uplink data channel resource overlapping with the preamble.
[0315]
​The method according to any one of the appended claims 1 to 29, wherein the mapping is performed in a direction with a lowest frequency from an uplink data channel resource overlapping the preamble and along a frequency increasing direction.
[0316]
​The method according to any one of the appended claims 1 to 30, wherein the demodulation reference signal is further used to estimate a Timing Advance (TA) of the terminal device.
[0317]
​Appendix 32: A random access method, comprising:
[0318]
​receiving, by a network device, a first random access request including at least a preamble, an uplink data, and a demodulation reference signal sent by the terminal device; wherein the mapping of the uplink data channel resource of the preamble to the uplink data and the demodulation reference signal port of the demodulation reference signal is determined according to configuration information or configured by the network device; and
[0319]
​Sending a random access response to the terminal device
[0320]
​The method according to claim 32, wherein one of the preambles is mapped to at least one tuple of the uplink data channel resource and the demodulation reference signal port, and one uplink data channel resource is at least configured with one demodulation reference signal port.
[0321]
​The method according to claim 32 or 33, wherein one of the preambles is mapped according to an ascending order of indexes of one or more demodulation reference signal ports of one uplink data channel resource, and then the one or more uplink data channel resources are performed in ascending order of frequency.
[0322]
​The method according to claim 32 or 33, wherein when the network device configures the uplink data channel resource for the terminal device, the network device further configures a demodulation reference signal port associated with the uplink data channel resource, and configures a preamble and/or a random access opportunity associated with the uplink data channel resource and the demodulation reference signal port.
[0323]
​A terminal device, comprising a memory and a processor, wherein the memory stores a computer program, and the processor is configured to execute the computer program to implement the random access method according to any one of figures 1 to 31.
[0324]
​A network device, comprising a memory and a processor, wherein the memory stores a computer program, and the processor is configured to execute the computer program to implement the random access method according to any one of Figures 32 to 35.
​Claims
​[Claim 1]
​A random access device, comprising: a request sending unit, configured to send a first random access request comprising at least a preamble, an uplink data and a demodulation reference signal to a network device; wherein the mapping of the uplink data channel resource of the preamble to the uplink data and the demodulation reference signal port of the demodulation reference signal is determined according to configuration information from the network device or configured by the network device; and a response receiving unit that receives a random access response sent by the network device.
​[Claim 2]
​The apparatus of claim 1, wherein one of the preambles is mapped to at least one of the uplink data channel resources and the demodulation reference signal port, and one of the uplink data channel resources is at least configured with one of the demodulation reference signal ports.
​[Claim 3]
​The apparatus according to claim 1, wherein the preamble is mapped according to an ascending order of indexes of one or more demodulation reference signal ports of one uplink data channel resource, and then the one or more uplink data channel resources are performed in ascending order of frequency.
​[Claim 4]
​The apparatus of claim 1, wherein one of the preambles is mapped to R of the uplink data channel resources, and the preamble is mapped to P demodulation reference signal ports within each of the uplink data channel resources. Wherein the preamble is mapped according to an ascending order of an index of the demodulation reference signal port in R uplink data channel resources; and then performing in ascending order of the frequency of the uplink data channel resource in the R uplink data channel resources, wherein R ≥ 1, P ≥ 1, and R ≥ R.
​[Claim 5]
​The apparatus of claim 4, wherein the tuple determination is not used for the first random access request if one tuple of the uplink data channel resource and the demodulation reference signal port is not mapped to the preamble. And/or transmit a second random access request including the preamble but not the uplink data and the demodulation reference signal if one of the preamble is not mapped to one tuple of the uplink data channel resource and the demodulation reference signal port.
​[Claim 6]
​The apparatus according to claim 1, wherein one of the uplink data channel resources is configured with a first demodulation reference signal port and a second demodulation reference signal port that are frequency division multiplexed, wherein the first demodulation reference signal port and the second demodulation reference signal port occupy all subcarriers in a frequency domain, or one uplink data channel resource is configured with a third demodulation reference signal port and a fourth demodulation reference signal port.
​[Claim 7]
​The apparatus according to claim 1, wherein in the case that the uplink data uses an orthogonal frequency division multiplexing waveform, a frequency division multiplexing first demodulation reference signal port and a second demodulation reference signal port are used; and in the case that the uplink data uses the discrete Fourier transform to expand the orthogonal frequency division multiplexing waveform, the third demodulation reference signal port and the fourth demodulation reference signal port used by code division multiplexing are used.
​[Claim 8]
​The apparatus according to claim 1, wherein the plurality of uplink data channel resources are at least configured as a first group and a second group, and one uplink data channel resource is at least configured with one demodulation reference signal port, wherein parameters of at least one of the following parameters of the uplink data channel resource of the first group and the uplink data channel resource of the second group are different: size, modulation mode, code rate, waveform, demodulation reference signal configuration.
​[Claim 9]
​The apparatus according to claim 8, wherein the uplink data channel resource of the second group has a larger size or a lower modulation mode than the uplink data channel resource of the first group, and under the condition that at least one of the following conditions, the uplink data channel resource of the second group is selected: the random access request is for a common control channel, and the size of the service data unit of the common control channel plus the size of the medium access control sub-header is greater than the first threshold. The size of the random access request is greater than a second threshold, and/or the path loss of the random access request and/or the reception power of the reference signal is less than a third threshold; and the terminal device is in a radio resource control connection state, and has user plane data to be sent.​; the block error rate of the transmission of the uplink data channel is greater than the fourth threshold; the reference signal receiving power is less than the fifth threshold; and the signal-to-noise ratio or the signal-to-noise ratio is less than the sixth threshold.
​[Claim 10]
​The apparatus according to claim 8, wherein a preamble mapped by an uplink data channel resource of the first group is the same as a preamble mapped by an uplink data channel resource of the second group; and/or an uplink data channel resource of the first group overlaps with an uplink data channel resource of the second group, and overlapping uplink data channel resources are configured with different demodulation reference signal ports.
​[Claim 11]
​The apparatus of claim 1, wherein the one or more preambles are configured in at least one random access channel opportunity, the one or more uplink data channel resources and the demodulation reference signal port being configured in at least one uplink data channel opportunity.
​[Claim 12]
​The apparatus of claim 11, wherein the preamble in one of the random access channel opportunities is mapped to one of the uplink data channel opportunities. And the preamble is mapped in one of the uplink data channel opportunities, and then the one or more uplink data channel opportunities are mapped in an ascending order of frequencies. And/or when the uplink data channel resource within the uplink data channel opportunity is configured, the relative position of the uplink data channel resource within the uplink data channel opportunity is indicated; and/or the plurality of random access channel opportunities are used as one set of the preamble, and the plurality of uplink data channel opportunities are used as one set of the uplink data channel resource and the demodulation reference signal port.​and mapping a preamble in the set of preambles to a set of the uplink data channel resource and the demodulation reference signal port.
​[Claim 13]
​The apparatus of claim 11, wherein the plurality of uplink data channel opportunities are at least configured as a third group and a fourth group, wherein a parameter of at least one of an uplink data channel opportunity of the third group and an uplink data channel opportunity of the fourth group is different from a size, a modulation mode, a code rate, a waveform, and a demodulation reference signal configuration.
​[Claim 14]
​The apparatus of claim 1, wherein the mapping in a time interval can be mapped to a tuple of the uplink data channel resource and the demodulation reference signal port within a plurality of time intervals, the mapping further performing a time increment order for tuples within the plurality of time intervals.
​[Claim 15]
​The apparatus according to claim 1, wherein the sending unit is further configured to: when the preamble is available but the uplink data channel resource and the demodulation reference signal port are unavailable, send a second random access request including the preamble without including the uplink data and the demodulation reference signal; and when the preamble is unavailable, determine not to send the first random access request and the second random access request.
​[Claim 16]
​The apparatus of claim 1, wherein, when the uplink data channel resource is configured by the network device, a demodulation reference signal port associated with the uplink data channel resource is configured, and a preamble and/or a random access opportunity associated with the uplink data channel resource and the demodulation reference signal port are also configured.
​[Claim 17]
​The apparatus of claim 1, wherein at least two uplink data channel resources are multiplexed in one resource block, wherein the at least two uplink data channel resources are associated with different demodulation reference signal ports; and the at least two uplink data channel resources are alternately mapped to resource particles according to the order of the first frequency domain rear time domain.
​[Claim 18]
​The apparatus of claim 1, wherein when the uplink data channel resource overlaps the preamble in a frequency domain, channel estimation is performed on the uplink data using the preamble. And/or a first size of the uplink data channel resource that does not overlap with the preamble is configured to be greater than a second size of the uplink data channel resource that overlaps with the preamble; and/or the demodulation reference signal is further used to estimate a timing advance of the terminal device; and/or the mapping starts from a lowest frequency with an uplink data channel resource overlapping the preamble.
​[Claim 19]
​A random access device, comprising: a request receiving unit that receives a random access request sent by the terminal device at least comprising a preamble, an uplink data, and a demodulation reference signal; wherein the mapping of the uplink data channel resource of the preamble to the uplink data and the demodulation reference signal port of the demodulation reference signal is determined according to configuration information or configured by a network device; and a response sending unit, which sends a random access response to the terminal device
​[Claim 20]
​A communication system, comprising: a terminal device, configured to send a first random access request comprising at least a preamble, an uplink data, and a demodulation reference signal to a network device. And receiving a random access response sent by the network device; and a network device receiving the first random access request and sending the random access response to the terminal device, wherein the mapping of the uplink data channel resource of the preamble to the uplink data and the demodulation reference signal port of the demodulation reference signal is determined according to configuration information from the network device or configured by the network device.