FIELD
[0002]
The present application relates to wireless communication technology, and more particularly, to an apparatus and method for a wireless communication system for multi-user combined transmission (Multi-User Superposition Transmission, MUST) in the base station regarding a demodulation reference signal transmission side, and apparatus and method for user equipment side.
Background technique
[0003]
In conventional 3GPP, the base station demodulation reference signal is inserted in the data stream of the user equipment and notifies the user equipment, transmission power of the user data stream user with the same reference transmission power of the demodulated signal. It should be noted, in some examples, the reference demodulation reference signal may also be referred to as user-specific reference signal, and the data stream may also be referred to as the data layer. In multiuser superposition transmission, there are existing demodulation reference signal transmission following drawbacks: 1) the base station needs to notify power allocation coefficients to the at least one user equipment, since the power distribution coefficients will be adjusted dynamically according to the channel conditions, and therefore the dynamic power allocation coefficient notification needs to occupy more signaling overhead; and 2) the transmit power allocated to the respective demodulation reference signals of the user equipment is only part of the power, the equivalent channel estimation will affect the quality.
[0004]
SUMMARY
[0005]
It gives a brief summary of the present disclosure hereinafter, in order to provide a basic understanding of some aspects of the present disclosure. However, it should be understood that this summary is not an exhaustive overview of the disclosure. It is not intended to be used or the critical portion of the present disclosure determines an important part of, nor is it intended to limit the scope of the present disclosure. Its sole purpose is to present some concepts in a simplified form on the present disclosure, as a prelude to the more detailed description that is presented later.
[0006]
In view of the above problems, an object of the present disclosure is to provide an apparatus and method are capable of overcoming the base station side of the wireless communication system for multi-user prior art above defects in the combined transmission and an apparatus and method for a user equipment side, which avoid signaling overhead due to the larger coefficient of power allocation notification caused achieved at full power and transmit a demodulation reference signal to improve channel estimation quality.
[0007]
According to an aspect of the present disclosure, there is provided an apparatus of a base station side radio communication system for multi-user transmission in the overlay, the apparatus comprising: superimposing a control unit configured to set a plurality of user equipment comprises a user equipment each user data stream are inserted into the device and to be superimposed with the data stream corresponding to the respective demodulation reference signal to the user equipment corresponding to the data demodulation reference signal flow, wherein the superimposition control means for each user equipment assign a particular data stream so that the data transmit power to each user equipment in the same stream in the time-frequency resources without the use of multiple input multiple output performance gain, and / or a plurality of user devices are transmitted to the case where the code division multiplexing; and instruction generation unit is configured to generate at least a first user equipment an indication of a plurality of other user equipment devices in the user data stream corresponding to a plurality of demodulation reference signal in the user equipment, a user device to a first auxiliary multi-user superimposing transmission data demodulation.
[0008]
According to embodiments of the present disclosure preferred embodiment, the data stream corresponding to the respective demodulation reference signal device with a user different orthogonal codes, so that the data stream corresponding to the respective demodulation reference signal in the user equipment is on the same resource element sent to each user equipment.
[0009]
According to another preferred embodiment of the present disclosure, each user equipment has only a single layer data stream, superimposing the control unit will only support single demodulation reference signal data stream are inserted into the data stream the respective user equipment.
[0010]
According to another preferred embodiment of the present disclosure, the superimposition control unit is further configured with a pair of respective data stream corresponding to the user device to assign a specific demodulation reference signal transmit power, and in accordance with the assigned power, the respective user equipment data stream corresponding to the demodulation reference signal are superimposed.
[0011]
According to another preferred embodiment of the present disclosure, the data stream with a superimposed manner overlapping manner corresponding to the data demodulation reference signal flow of each user and each user equipment device different.
[0012]
According to another preferred embodiment of the present disclosure, the transmit power allocation allocated corresponding to the data stream of the respective demodulation reference signal to the user equipment transmit power of the same data stream.
[0013]
According to another preferred embodiment of the present disclosure, the indication contained in a physical layer signaling.
[0014]
According to another preferred embodiment of the present disclosure, the superimposition control unit is further configured to determine the reference signals from the plurality of groups each consisting of a plurality of demodulation reference signals for a group of user devices a reference signal group, wherein the determined the number of the demodulation reference signal is a reference signal included in the group is greater than or equal to a group of user equipment comprising a user equipment, and on the reference signal contains an index indicating the determined group.
[0015]
According to a further preferred embodiment of the disclosure, the indication information further comprises a set of reference signals for demodulating the determined reference signal for the first user device.
[0016]
According to a further preferred embodiment of the disclosure, the indication further comprises at least one bit for indicating to a user equipment an indication manner demodulation reference signal, indicating the manner set comprises a demodulation reference signal indicative of a demodulation reference signal and traditional manner indication of the way.
[0017]
According to another preferred embodiment of the present disclosure, the instruction generation unit is further configured to use a traditional demodulation reference signal indicative of a set of user equipment mode at least a second user equipment.
[0018]
According to another preferred embodiment of the present disclosure embodiments, the apparatus further comprising: a storage unit configured to store information comprising a plurality of demodulation reference signal group set groups of reference signals, wherein each of the demodulation reference signals contained in the group a plurality of demodulation reference signal code division orthogonal to each other, superimposing the control unit reads the storage unit to determine a set of reference signals for a group of user devices.
[0019]
According to another preferred embodiment of the present disclosure embodiments, the apparatus is a base station, and the apparatus further comprising: a transmitting unit, configured to indicate a demodulation reference signal and transmits the superimposed to at least a first user device.
[0020]
According to another aspect of the present disclosure, the base station apparatus side is also provided a radio communication system for multi-user transmission in the overlay, the apparatus comprising: inserting a control unit is configured to after stacking a plurality of user equipment inserted into the data stream common demodulation reference signal; and an instruction generating unit configured to generate a user equipment indicates at least a first plurality of user equipments on the respective plurality of user equipment devices in the user power allocation coefficient data corresponding to the stream to assist the user equipment a first overlay data demodulation multi-user transmission.
[0021]
According to another aspect of the present disclosure, an apparatus is also provided a user equipment-side multi-user wireless communication system for superimposing the transmission, the apparatus comprising: an equivalent channel estimation unit configured in accordance with the base station from about a demodulation reference signal and the demodulation reference signal for the indication of the other user equipment estimate data stream corresponding to the data stream corresponding to the user equipment and other user equivalent channel equivalent equipment superimposed user equipment and another user equipment channel, wherein the user regarding a demodulation reference signal and a demodulation reference signal device with respect to other user devices are inserted in the data stream the respective user equipment, and the data stream of each user equipment by the base station at a particular transmit power, to the same time-frequency resource in transmitting performance without using a multi-output gain and / or in the case of multi-input code division multiplexing; and a data demodulation unit, the data transmission is configured in accordance with the estimated equivalent channel superimposed multi-user demodulation.
[0022]
According to another aspect of the present disclosure, an apparatus is also provided a user equipment-side multi-user wireless communication system for superimposing the transmission, the apparatus comprising: an equivalent channel estimation unit is configured from a base station in accordance with a common solution modulated reference signal superimposed upon the estimated equivalent channel corresponding to the data stream from the base station, wherein the common demodulation reference signal is inserted in the superimposed data stream; and a data demodulation unit configured in accordance with the estimated equivalent channel and indication of the power from a base station on the partition coefficient of the user equipment and another user equipment demodulates the transmitted data is superimposed on the multi-user.
[0023]
According to another aspect of the present disclosure also provides a method for multi-user wireless communication system in superposition transmission for base station side, the method comprising: for each user in a group of user equipment comprising a plurality of user equipment data streams are inserted in the apparatus and superimposed with the data stream corresponding to the respective demodulation reference signal to the user equipment corresponding to the data stream demodulation reference signal, wherein the transmit power allocated to a particular data streams to each user equipment such that each data flow of the user equipment without the use of multiple input multiple output performance gain, and / or a plurality of user devices are transmitted to the case where the code division multiplexed in the same time-frequency resources; and at least a first plurality of user equipment generating a user equipment an indication of a plurality of other user equipment devices in the user data stream corresponding to the demodulation reference signal, a first user device to assist demodulating data superimposed on the multi-user transmission.
[0024]
According to another aspect of the present disclosure also provides a method for multi-user wireless communication system in superposition transmission for base station side, the method comprising: inserting a common data stream demodulated at the superimposed plurality of user equipment reference signal; generating a flow indicating a corresponding power allocation coefficient data with respect to each user equipment of the plurality of user devices is at least a first user device of the plurality of user equipment, a user device to a first auxiliary superposed multi-user transmission data demodulation.
[0025]
According to another aspect of the present disclosure also provides a method of a user equipment-side multi-user wireless communication system in superimposed for transmission, the method comprising: after superposition with respect to the user equipment and another user equipment from the base station demodulation reference signal and the demodulation reference signal for the indication of the other user devices estimated equivalent channel data streams corresponding to the user equipment and other equivalent channel corresponding to the user equipment, wherein, with respect to the user equipment demodulation reference signal and a demodulation reference signal with respect to other user devices are inserted in the data stream the respective user equipment, and the data stream of each user equipment in a particular transmit power, in the same time-frequency resource by the base station without using a multi- input multiple-output performance gain of the transmission and / or in the case of code division multiplexing; and demodulating data superimposed on the multi-user transmission based on the estimated equivalent channel.
[0026]
According to another aspect of the present disclosure also provides a method of a user equipment-side multi-user wireless communication system in superimposed for transmission, the method comprising: estimating from the superposition of the base station according to a common demodulation reference signal from a base station after the data stream corresponding equivalent channel, wherein the common demodulation reference signal is inserted in the superimposed data stream; and based on the estimated equivalent channel coefficients and power allocation with respect to the user equipment and another user equipment from the base station an indication of the multi-user demodulating data superimposed transmission.
[0027]
According to another aspect of the present disclosure, an electronic device is also provided, the electronic device may include a transceiver and the one or more processors, the one or more processors may be configured to perform wireless communication in accordance with the above disclosure of the present the method or system function in the respective units.
[0028]
According to other aspects of the present disclosure is also provided for implementing the above-described computer program code recorded thereon a computer program product and method of the present disclosure and the computer on which the computer program code for realizing the above-described method according to the present disclosure readable storage media.
[0029]
According to the present embodiment of the present disclosure, to obtain the corresponding equivalent channel method as compared with the prior art into the corresponding demodulation reference signal in the user data stream through a plurality of user demodulation reference signal superimposed transmission channels can be reduced order overhead, and by inserting the common demodulation reference signal to obtain a more accurate estimate of the channel data stream superimposed upon a plurality of users.
[0030]
In the present specification are given in the following section embodiments disclosed in other aspects of the embodiment, wherein, for a detailed description of preferred embodiments of the present disclosure embodiment fully disclosed embodiments without applied thereto is defined.
BRIEF DESCRIPTION
[0031]
The present disclosure may be better understood by reference to the following detailed description given in conjunction with the accompanying drawings, in which the same or similar reference numerals in the drawings to refer to the same or like parts. The drawings together with the detailed description are included in a part of the present specification and form of the specification, it serves to further illustrate the embodiments and explain the principles and advantages of the present disclosure of the preferred embodiment of the disclosure. among them:
[0032]
FIG 1A is a diagram showing a first exemplary embodiment of the demodulation reference signal transmitted from the wireless communication system is a multi-user transmission in superposition according to an embodiment of the present disclosure;
[0033]
FIG 1B is a diagram showing a second exemplary embodiment of the demodulation reference signal transmitted from the wireless communication system is a multi-user transmission in superposition according to an embodiment of the present disclosure;
[0034]
FIG 2 is a functional block diagram illustrating a base station apparatus side of a wireless communication system in a multi-user transmission overlay configuration example according to an embodiment of the present disclosure of the first embodiment;
[0035]
3A is a schematic diagram showing an example of the demodulation reference signal transmitted in a superimposed manner in the case where the non-linear embodiment of the present disclosure;
[0036]
3B is a schematic diagram showing an example of Gray constellation superimposed manner in the case of non-linear embodiments of the present disclosure;
[0037]
4A is a schematic diagram illustrating a first exemplary embodiment demodulation reference signal group indication embodiments of the present disclosure;
[0038]
FIG 4B is a schematic diagram illustrating a second exemplary embodiment indicates a demodulation reference signal group of embodiments of the present disclosure;
[0039]
5A is a diagram illustrating the plurality of sets of user equipment for a multi-user transmission and in the case superimposed single data stream, multi-user wireless communication system of the present disclosure Application superimposed transmission in each user equipment has a Solution modulated reference signal transmission exemplary schematic;
[0040]
5B is a case of a multilayer data stream, a schematic diagram of a first example of the demodulation reference signal transmitted from the wireless multi-user communication system of the present disclosure Application superimposed transmission in the user equipment has shown;
[0041]
5C is a case of a multilayer data stream, a schematic diagram of a second example of the demodulation reference signal transmitted from the wireless multi-user communication system of the present disclosure Application superimposed transmission in the user equipment has shown;
[0042]
FIG 6 is a functional block diagram illustrating a user equipment device side wireless communication system in a multi-user transmission overlay configuration example according to an embodiment of the present disclosure of the first embodiment;
[0043]
FIG 7 is a block diagram illustrating another functional device side of the user equipment a radio communication system in a multi-user transmission overlay configuration example according to the first embodiment of the disclosure;
[0044]
FIG 8 is a block diagram illustrating still another feature of the device is a user equipment-side multi-user wireless communication system superimposed transmission in the present configuration example of a first embodiment of the disclosure;
[0045]
FIG 9 is a flowchart illustrating a signaling interaction process in a wireless communication system is a multi-user transmission in superposition according to the first embodiment of the disclosure;
[0046]
FIG 10 is a functional block diagram illustrating a base station apparatus side wireless communication system in a multi-user transmission overlay configuration example of a second embodiment according to the present embodiment of the disclosure;
[0047]
FIG 11 is a functional block diagram illustrating a user equipment device-side multi-user wireless communications system superimposed transmission in the present configuration example of a second embodiment of the disclosure;
[0048]
FIG 12 is a flowchart illustrating a signaling interaction process in a wireless communication system is a multi-user transmission in superposition according to the second embodiment of the disclosure;
[0049]
FIG 13 is a flowchart showing a procedure of a method of the base station side radio communication system in a multi-user transmission superposition according to an exemplary embodiment of the present disclosure;
[0050]
FIG 14 is a flowchart showing a procedure of a method of the base station side radio communication system in the multi-user combined transmission according to the present example of another embodiment of the disclosure;
[0051]
FIG 15 is a flowchart showing the process of a method of a user equipment-side multi-user wireless communications system superimposed transmission in the present example of embodiment according to an embodiment of the disclosure;
[0052]
FIG 16 is a flowchart showing an example of a process of a method of a user equipment-side multi-user wireless communication system according to another embodiment of the present disclosure of embodiments of the superimposed transmission;
[0053]
FIG 17 is a block diagram illustrating a configuration of a personal computer as the information processing apparatus of the present disclosure may be employed in the embodiment of the embodiment;
[0054]
FIG 18 is a block diagram of a first example of the present technology evolved Node disclosure (eNB) is a schematic configuration may be applied;
[0055]
FIG 19 is a block diagram illustrating a second example of a schematic configuration of eNB may be applied in the art of the present disclosure;
[0056]
FIG 20 is a schematic block diagram illustrating an exemplary configuration of an application technology of the present disclosure may be a smartphone; and
[0057]
FIG 21 is a block diagram illustrating a schematic configuration of the car navigation apparatus disclosed technology may be applied.
detailed description
[0058]
The exemplary embodiments of the present disclosure will be described below in conjunction with the accompanying drawings. For clarity and conciseness, in the specification are not all features of an actual implementation. However, it should be understood that many decisions must be made to the specific embodiments of the development of any such actual embodiment of the process in order to achieve the developer's specific goals, such as compliance with those restrictions related systems and services, and these restrictions may be subject to change with different embodiments. In addition, it should be understood that, although the development work can be very complex and time-consuming, but the benefit of this disclosure to those skilled in the, this development is only a routine task.
[0059]
Here, also be noted that, in order to avoid unnecessarily obscure the details of the present disclosure, the drawings only shows a program according to the present disclosure closely related device structures, and / or processing steps, omitted additional details of this little public relations.
[0060]
Next, an embodiment will be disclosed with reference to FIGS. 1A to FIG. 21 described.
[0061]
Before describing embodiments of the present disclosure will be briefly described in relation to the present disclosure superposition superposition coded multi-user (Superposition Coding) based transmission technology.
[0062]
As a means by superposition coding, the transmitter can use the same transmission resource to communicate with a plurality of receivers. For example, current downlink transmission can support multiple users overlay base stations simultaneously transmit multiple data streams to more than one user equipment, without the need to distinguish between the use of different time, frequency, codeword, or multi-antenna technology. As an example, consider a first radio transmitter Tx physical communication link L1 and the first receiver Rx1 and the radio communication transmitter Tx via a second communication link with the receiver Rx2 L2 via communication. Suppose radio conditions for the first receiver / link (e.g. a position farther from the transmitting end) for weaker and for the second receiver / link (e.g. from a position close to the transmitter) is stronger (this case may it is temporary, because changing radio conditions, especially for the mobile station is). In other words, for a fixed radio transmission power, the signal to interference and noise of the first receiver and interference ratio SINR carrier C / I ratio is less than a respective second emitter SINR and C / I ratio (or lower than that obtained many). The transmitter receivers known two opposing radio conditions between the two Tx receiver may be assigned in proportion to their power budget for a particular carrier frequency and a particular time slot, such that the second receiver Rx2 and intended for (more the receiver under strong radio conditions) as compared to the second data block, with higher power transmissions intended for the first receiver Rx1 (the receiver under weak radio conditions) a first data block. For example, radio conditions first receiver Rx1 and the second case due to the additional interference due to the second receiver Rx2 transmits the second data block, the transmitter Tx can be used for the intended sufficient power for a given current a data block to allow the first receiver Rx1 decoding this block. Transmitter Tx less power may then be used for the intended second receiver Rx2 of the second data block, but still enough to use the second receiver Rx2 to eliminate or reduce the transmission of the first data block caused by interfering cancellation to decode the second data block. Transmitter Tx and then transmit the two data blocks at the same time on the same carrier frequency. Thus, these two blocks may be considered the "collision." Because the higher power allocation by the second data block to transfer a first data block, the second block of data is only presented as noise or interference increases toward the first receiver Rx1. If the power offset between the transmission of two data blocks is sufficiently high, then the SINR Rx1 at the first receiver may be degraded or even smaller and insignificant. Thus, if the transmission rate with respect to the first data block, the current radio conditions and additional interference caused by the transmission of the second data block is transmitted with sufficient power A first data block, the first receiver Rx1 should be able to decode the first data block. Second receiver Rx2 should be able to decode the first data block as the second receiver Rx2 is superior to the first receiver Rx1 of the first data block received SINR, which is due to the strong radio conditions of the second receiver Rx2 cause. Once the second receiver Rx2 decoded first data block, the second receiver Rx2 can be treated as interference, and interference cancellation techniques known to use the overall signal reception during the two periods of data blocks received from eliminate the interference. A second data block represents a residual signal derived from the combined noise and interference from other sources. If the radio condition of the transmission rate with respect to the second block and the second receiver Rx2 of sufficient power (but a lower power than the first data block) transmission of a second data block, then the second receiver should be able to decode the first Rx2 two data blocks.
[0063]
Note that this method may be extended to three or more receivers. For example, the maximum power may be allocated for transmission to a receiver at the weakest radio conditions, minimum power allocation may be used for transmission to the receiver is the strongest radio conditions, and may be an intermediate power distribution the receiver is a radio for intermediate conditions. The receiver is the strongest radio conditions may then decode the data block is intended for the radio receiver is weakest conditions, eliminating the decoding block from the received signal, a receiver may be decoded in the intermediate radio conditions data block, eliminating a second decoding block, and intended for its own last decoded data block (this decoding / Successive interference cancellation process may be referred elimination). A radio receiver in an intermediate condition may also be intended for decoding data blocks in a radio receiver is weakest conditions will eliminate from the received signal, and then decodes the data intended for its own block. A radio receiver is in the weakest conditions may be able to directly decode the data block intended for it, since the data block with the highest transmission power level. It should be understood that those skilled in the art should be able to expand progressively interference cancellation techniques to four or more receivers without requiring additional testing or further creative work. The receiver may be a mobile station, user equipment, for example, and the transmitter may be a base transceiver station, for example the eNB, for example, a packet data block, transport block (Transport Block).
[0064]
Whereby a linear superposition of signals of different power, the base station can be realized using the same transmission resource to a user equipment a large difference in channel conditions for the plurality of superimposed multi-user transmission. In addition, the base station may also use the non-linear portion of a superimposed manner constellation mapping implemented using the same transmission resources in a user equipment quite different channel conditions to a plurality of superposed multi-user transmission, in some embodiments, the non-linear superposition, for each power allocated data flow of the user equipment may also be exactly the same. With the development of technology superposition coding, the present invention is disclosed in consideration of its application to an actual communication system, the need to involve the base station to the user equipment an indication of a dynamic transmission power level overhead problem, and in order to assist the user equipment in the data signal demodulation, the base station typically inserted into the data demodulation reference signal, and thus there is also inserted and the power distribution of the demodulated reference signal problem.
[0065]
In the present disclosure, mainly two methods are proposed in a wireless communication system for multi-user transmission superposition demodulation reference signal is transmitted. One is respectively inserted into the respective demodulation reference signal in the respective user data streams and the transmission of these superimposed demodulation reference signal by allocating a certain power for these demodulation reference signals, a plurality of users in the other superimposed common demodulation reference signal inserted into the data stream for transmission and the demodulation reference signal allocation for a common full power.
[0066]
1A and 1B illustrate two or more demodulation reference signal transmission method. FIG 1A is a diagram illustrating a first exemplary embodiment of the demodulation reference signal transmitted from the wireless communication system in a multi-user transmission superposition according to an embodiment illustrating the present disclosure, and FIG. 1B is a diagram illustrating an embodiment of the present disclosure a schematic view of a second exemplary embodiment of the demodulation reference signal transmitted from the wireless multi-user communication system in a superimposed transmission.
[0067]
Suppose TB1 (transport block 1) and TB2 (transport block 2), the above-described first to the user equipment 1 and user equipment 2 superimposed multi-user transmission, and the transmission data for the user equipment 1 and user equipment 2 are respectively a method, as shown in the prior power distribution module 1A are inserted into the modulated data stream after the user equipment 1 DMRS1 demodulation reference signal and a demodulation reference signal inserted DMRS2 the user equipment 2 in the modulated data stream to DMRS1 superimposed and DMRS2 after the power allocation, a demodulation reference signal and superimposed is transmitted to the user equipment and the user equipment 21. For the above-described second method, as shown in FIG 1B is inserted in the data stream after the user equipment 1 and the user superimposing apparatus 2 and the common demodulation reference signal DMRS full power allocation for a common demodulation reference signal DMRS, thereby to the user equipment and the user equipment 21. Note that in FIGS. 1A and 1B in the example shown, wherein the precoding module may be omitted, and the user equipment for a signal to be transmitted to the user equipment 1 and the stream of precoded 2, which may be through different antennas or It may also be sent to the user equipment and the user equipment 21 via the same antenna.
[0068]
These are only a schematic view of FIG. 1A and 1B according to the general description of the technical concepts of the present disclosure, the following will first embodiment and the second embodiment described in detail in the above two embodiments demodulation reference signal transmission method.
[0069]
First embodiment
[0070]
First, the function of the device described in FIG. 2 the base station side radio communication system of multi-user transmission in superposed configuration example according to an embodiment of the present disclosure of the first embodiment will be described. FIG 2 is a functional block diagram illustrating a base station apparatus side of a wireless communication system in a multi-user transmission overlay configuration example according to an embodiment of the present disclosure of the first embodiment.
[0071]
As shown in FIG 2, may include a control unit 202 and superimposing unit 204 indicating generation apparatus 200 according to this embodiment.
[0072]
Superimposing the control unit 202 may be configured to each user device in a set of user equipment comprises a plurality of user equipment are inserted in the data stream to the data stream corresponding to the demodulation reference signal and a data stream with a respective user equipment corresponding to the demodulation reference signal are superimposed, wherein the superimposing unit 202 controls the data flow of each user equipment-specific transmit power allocation to each user equipment so that the data stream at the same time-frequency resources without the use of multiple input multiple output performance where the gain and / or code division multiplexing are transmitted to a plurality of user devices. Wherein the non-linear multi-user or can be determined in accordance with the program superimposed conventional multi-user linear superposition schemes for a particular transmit power allocated to the data stream, the present disclosure is not repeated here.
[0073]
It should be understood, in the example of the present invention is applied to an LTE system, since the LTE system according to physical resource blocks (Physical Resource Block, PRB) performs resource scheduling for data transmission, and therefore frequency resource may refer to physical resource blocks of the above, however, other wireless communication systems may also be referring to the same time slot and other resources on the same carrier units, the present disclosure is not limited to this.
[0074]
It should be noted, the reference signal for demodulation of a plurality of user equipment may be a multi-user transmission superimposed in the same time-frequency resource units such as particles (Resource Element, RE), or may not be located on the same time-frequency resource block within the same cell , so that when a plurality of demodulation reference signals for user equipment to be superimposed, superimposed resource elements may be the same or different sources may be superimposed particles in the same resource block.
[0075]
In the latter case, i.e., a demodulation reference signal device located in a plurality of user units infrequent simultaneously within the same resource element on the resource block, although this can provide more resources available demodulation reference signal, although other user equipment e.g. in addition to the other demodulation signals (e.g., data stream) other than the reference signal might interfere with the demodulation reference signal based on a channel estimate.
[0076]
Given the data stream corresponding to the respective demodulation reference signal in the user equipment the same resource element or the same as described above, as a preferred example, the data stream corresponding to the respective demodulation reference signal device with a user different orthogonal codes, such that the reference symbols (reference symbol) is transmitted to each user equipment. Wherein the respective demodulation reference signals, for example, the user equipment using the same reference signal sequence.
[0077]
Here, for example, orthogonal codes may be orthogonal mask (the OCC), so that the reference signal by demodulating the respective user equipment is assigned a different orthogonal transmit power mask, and, other user devices to avoid data demodulation reference signal for the interference (user equipment respective demodulation reference signals are transmitted on the same resource element, so that no data demodulation reference signal multiplexing and where the resource), and by the different orthogonal cover also ensures that the different user equipments orthogonality between the demodulation reference signal, to avoid interference between the demodulation reference signal, thereby enabling a more accurate channel estimation and demodulation.
[0078]
Preferably, the superimposition control unit 202 may be further configured with a data stream corresponding to the respective user device to assign a specific demodulation reference signal transmit power, and in accordance with the assigned power, and the data stream corresponding to the respective user equipment Solutions modulated reference signal is superimposed.
[0079]
As a preferred example, the data stream corresponding to the demodulation reference signal superimposed manner the respective user equipments overlapping manner with each user data stream different devices, e.g., a data stream may be superimposed on a non-linear manner, while the corresponding demodulation reference signals may be superimposed in a linear manner, so that the design flexibility can be higher demodulation reference signal, and processing the receiver performing a channel estimation easier. However, alternatively, the data stream corresponding to the demodulation reference signal superimposed manner the respective user equipments overlapping manner with the respective data flow of the user equipment may also be the same, i.e., when the data stream non-linear manner superimposed , corresponding to the demodulation reference signal may be superimposed in a linear manner.
[0080]
Specifically, in the case where a demodulation reference signal for the linear superposition manner by demodulation reference signal allocation bit streams of different user equipment corresponding to the different power (e.g., from the base station to the user equipment far larger distribution transmit power, from the base station to transmit power is preferably smaller closer / channel conditions are allocated to the UE) linear superposition. Specifically, the user equipment 1, it is assumed that the demodulation reference signal as S 1 , and the power distribution coefficient [alpha] 1 , the user equipment 2, it is assumed that the demodulation reference signal is S 2 , and the power distribution coefficient [alpha] 2 , the weighting coefficient by using the power allocation of the demodulation reference signal S . 1 and S 2 for linear superposition, so that demodulation reference signal [number 0001] is a linear superposition of

[0081]
In the case where the data stream is a non-linear in a superimposed manner, as shown in FIG. 3A, a linear superposition is different from the embodiment, the bit stream of different users interspersed mixed into a bit stream, and based on this bit stream of a Gray constellation (FIG. FIG 3B) modulation joint, wherein the bits corresponding to the different bit streams of different users. For example, in the example shown in FIG. 3B, the first two bits may represent a remote user equipment corresponding to the bit stream, and the two bits may indicate a user equipment near a corresponding bit stream. Of course, the embodiment shown in FIG. 3B are merely exemplary, and those skilled in the art may also specify a user respective bits represented by a bit stream according to actual needs.
[0082]
Having a linear superposition manner superior to the interference effect, so that instead of a linear superposition embodiment can simplify the receiver design, so skilled in the art can be selected appropriately according to actual needs in a superimposed manner, the present disclosure is not limited to this.
[0083]
Preferably, in this embodiment, as described with reference to FIG. 1A, since the power allocation before the demodulation reference signals of the respective user device into which the data stream, thus transmitting the demodulation reference signal assigned to the user device power and transmit power allocated to the data flow of the user equipment is the same.
[0084]
Instruction generation unit 204 may be configured to indicate at least a first user device generates a data stream corresponding to the plurality of users on other user equipment devices in a plurality of demodulation reference signal in the user equipment, to assist the user equipment a first plurality user data demodulation superimposed transmission.
[0085]
It should be noted, for the user equipment farthest from the base station, since the transmission power assigned to the maximum, and therefore, only the user device based on its own demodulation reference signal to demodulate its own data stream, and carried on without knowing other user devices demodulation reference signal superimposed multiuser transmission, user equipment such legacy user equipment may also be implemented. For the user equipment from the base station closer to, if in addition to its demodulation reference signal, the user equipment also needs to know the demodulation reference signal from the base station to other remote user device information, even for multi-user superimposition When the user equipment using different precoding transmission or transmission scheme, the user equipment may also be prepared by first demodulated data stream and other distant user equipment as a linear interference cancellation after the introduction of the data stream itself, without specific power allocation information. That is, the multi-user superposition transmission, the demodulation reference signal for the respective user equipment, at least demodulated reference signal should be far away from the base station to inform the user of the user equipment from the base station apparatus to close.
[0086]
The above-described "first user equipment", for example, from the base station near the user equipment. That is, the prior art notification substituted its own demodulation reference signal and a power distribution coefficient corresponding to the first user device only, in the techniques of this disclosure, for the first user equipment, an indication generating unit 204 may generate for the first demodulation reference signal indicative of a user equipment and another user equipment itself, to the demodulation reference signal for the first user equipment and another user equipment notifies the first user device, a first user equipment to assist in multi-user transmission overlay data demodulation. It will be appreciated, the dynamic change of the quantization and fine-grained power allocation coefficient as compared to the respective demodulation reference signal allocated to the user equipment and the user equipment relative to the fixed based on the channel estimation result estimated according to other user equipment demodulation reference signal obtained a power distribution coefficient, it is possible to greatly reduce signaling overhead.
[0087]
Composition for the determination to be performed, and the group index of the demodulation reference signal group a group of user devices in a multi-user transmission superimposed there are two ways, and generally require prior agreement on the base station side and the user-side equipment.
[0088]
The first is static, i.e., pre-defined composition and group index of the reference signal is set in the communication protocol, so that both the fixed and storing information on the composition of the group index of the reference signal in the chip set base station and the user equipment-side side and the base station only with reference to the index signal group to which it is determined to notify the user equipment. Specifically, the control unit 202 may determine superimposing the reference signal is set for a group of user equipment from a plurality of reference signals each composed of a plurality of groups demodulation reference signals, wherein the reference signal included in the determined group demodulation the number of reference signals equal to or greater than the number of users of user equipment devices comprises a set, and the instruction further includes an index reference signal on the determined group.
[0089]
The second embodiment is a semi-static manner, i.e., the base station side reference signal is determined semi-statically set for each group of user equipment, and notifies to the user equipment via RRC signaling or broadcast in the reference signal group is changed.
[0090]
The indication may be included in the physical layer signaling, for example, in the LTE system may be control information (DCI) through the downlink physical downlink control channel (PDCCH) transmission, in particular be in the DCI scheduling assignment (scheduling assignment) Letter thereby indicating the transmission order with resource scheduling information to the user equipment, and can achieve high flexibility and a demodulation reference signal configuration notification. Alternatively, the indication may be included in the higher layer signaling (e.g., radio resource control (RRC) signaling), or may be included in the medium access control (MAC) layer signaling, the present disclosure is not limited to this.
[0091]
Preferably, the indication signal may further include a reference set of the determined information for a demodulation reference signal in the first user device. This information may be used for a demodulation reference signal in a first user device serial number of the reference signal in the group, or may be orthogonal cover (OCC) information to the first user equipment in accordance with the reference signal received by the group group index combined with demodulation reference signal for itself, the user can know the other devices for the remaining demodulation reference signal.
[0092]
Further, preferably, the indication may further comprise at least one bit for indicating an indication mode to the user equipment on the demodulation reference signal, indicating the manner herein may include a demodulation reference signal group indicates a conventional manner and a demodulation reference signal indicative of the way .
[0093]
Traditional demodulation reference signal indicative of the way the base station indicates that it itself refers demodulation reference signal to the user equipment only. For example, the base station may be added to the above-described conventional user equipment group in a multi-user transmission to overlay (e.g. legacy user equipment is set in the position farthest from the base station of user equipment, and thus using the maximum transmit power), the user equipment only in accordance with conventional their demodulation reference signal to demodulate the data stream without the release of other user equipment. Preferably, the instruction generation unit 204 may be further configured to at least a second user equipment (e.g., base station farthest from the legacy user equipment) a group of user equipment using conventional demodulation reference signal indicative of the way. In regard to a demodulation reference signal group indication mode, its implementation will be described in detail later. In a preferred example, the base station only user equipment close DMRS group indication mode to reduce system complexity.
[0094]
It will be appreciated, the reference signal indicative of demodulation scheme to be notified the base station, the user equipment using conventional demodulation reference signal indicative of the way, which itself can be demodulated data directly without the need for additional treatment, i.e., for such user equipment, does not need to know performing multiuser superposition transmission, only the demodulated data according to a conventional manner. For a user equipment using a demodulation reference signal group indication mode, it is necessary in the manner to be described later is superimposed on the transmitted multi-user data is demodulated, i.e., to the maximum transmission power of the demodulated data of the user equipment, then demodulated by a non-linear manner to eliminate the interference data itself, or may be performed by restoring the data demodulation constellation. Preferably, for a user equipment to use a demodulation reference signal group indication mode, may be selected for its demodulation reference signal supports only single data stream.
[0095]
Below with reference to FIGS. 4A and 4B exemplary embodiment demodulation reference signal group indicative of the detailed description.
[0096]
Before describing a demodulation reference signal group indication mode, the design principles described briefly demodulation reference signal and a demodulation reference signal group set group consisting of: a demodulation reference signal group composed of a plurality of demodulation reference signal, each user equipment demodulation reference signal corresponding to the position of the demodulation reference signal group is referred to as a user layer. Design Principles demodulation reference signal group set consisting of a plurality of demodulation reference signal group design layer by layer, i.e., first find all the possible demodulation reference signal as a demodulation reference signal constituting the element layer a first user, and , demodulation reference signal for the first layer constituting the user, and to find for a demodulation reference signal orthogonal demodulation reference signal of each constituent element of the first layer, the user of the second user signal as a demodulation reference layer, constituent layers so number of demodulation reference signal group 2. For demodulation reference signal is greater than the number of layers of group 2, similarly to the manner described above in layers superimposed demodulation reference signal for the determined orthogonal demodulation reference signal.
[0097]
In the example described below, preferably, the indication can be split into a plurality of portions, a portion (e.g., the user device indicates where the layer) may be transmitted through higher layer signaling, and the other part (e.g., on a demodulation reference signal group, indicating scrambling codes, etc.) can be transmitted by physical layer signaling.
[0098]
Referring to Figure 4A, which shows a first example of the present disclosure group demodulation reference signal indicative of the way of example. In the example shown in FIG. 4A, there is shown a demodulation reference signal group composed of a set of four demodulation reference signal DMRS group DMRS group 0 to group 3, which comprises two layers a user, wherein the DMRS0 corresponding to DMRS3 meanings are as follows in table 1:

Claims
[Claim 1]
An apparatus for the base station side radio communication system in the multi-user superposition transmission, said apparatus comprising: superimposing a control unit is configured to set for each user device in the user device comprises a plurality of user equipment data stream are inserted into and superimposed data stream corresponding to the respective demodulation reference signal to the user equipment corresponding to the data demodulation reference signal flow, wherein the control unit superimposing a specific transmit power allocation to each user equipment data streams so that the data stream of each user equipment at the same time-frequency resources without the use of multiple input multiple output performance gain and / or said plurality of user devices are transmitted to the case where the code division multiplexing; and an instruction generating unit configured to become the first user device generates a plurality of at least an indication about the other user equipment devices of the plurality of user data streams corresponding to the demodulation reference signal in the user equipment, the first user equipment to assist in multi-user superimposing transmission data demodulation.
[Claim 2]
The apparatus according to claim 1, wherein the data stream corresponding to the respective demodulation reference signal device with a user different orthogonal codes, such that the same resource data stream corresponding to the respective demodulation reference signal device user on the particles is transmitted to each user equipment.
[Claim 3]
The apparatus according to claim 2, wherein each user equipment has only a single data stream, the superimposition control means will only support single demodulation reference signal data stream are inserted into the data stream the respective user equipment.
[Claim 4]
The apparatus according to claim 1, wherein said control unit is further configured superimposing data stream corresponding to the pair of respective user equipments allocated specific demodulation reference signal transmit power, and in accordance with the assigned power, the respective data stream corresponding to the demodulation reference signal is superimposed on the user equipment.
[Claim 5]
The apparatus according to claim 4, wherein the data stream with a superimposed manner overlapping manner corresponding to the data demodulation reference signal flow of each user and each user equipment device different.
[Claim 6]
The apparatus according to claim 4, wherein the transmit power allocation allocated corresponding to the data stream of the respective demodulation reference signal to the user equipment transmit power of the same data stream.
[Claim 7]
The apparatus according to claim 1, wherein said indication comprises a physical layer signaling.
[Claim 8]
The apparatus according to claim 1, wherein the superimposing unit is further configured to determine a control from a plurality of reference signals each composed of a plurality of sets of reference signals for the demodulation a group of user devices the reference signal group number, wherein the number of the demodulation reference signal of the reference signal included in the determined group is greater than or equal to the user equipment a set of user apparatus included in, and includes an index indicating a reference signal on the determined group.
[Claim 9]
The apparatus according to claim 8, wherein the demodulation reference signal information indicating the first user equipment further comprises a set of a reference signal for the identified.
[Claim 10]
The apparatus according to claim 8, wherein the indication further comprises at least one bit to indicate to the user equipment an indication of the demodulation reference signal mode, comprising the indication mode for indicating a demodulation reference signal group and the conventional manner Solutions modulated reference signal indicative of the way.
[Claim 11]
The apparatus according to claim 10, wherein said instruction generation unit is further configured to use a conventional manner for a demodulation reference signal indicative of the set of user equipment at least a second user equipment.
[Claim 12]
The apparatus according to claim 8, further comprising: a storage unit configured to store information including the plurality of demodulation reference signal group set reference signal group, wherein each of the demodulation reference signal group contains more reference signal demodulated code division orthogonal to each other, the superimposing unit reading said memory control unit to determine a set of reference signals for said group of user devices.
[Claim 13]
The apparatus according to any of the 1 to 12 claims, wherein said apparatus is a base station, and said apparatus further comprising: a transmitting unit, configured to demodulate the superimposed reference signal and the indication transmitting to the at least first user device.
[Claim 14]
An apparatus for the base station side radio communication system in the multi-user superposition transmission, said apparatus comprising: inserting a control unit configured to be inserted into a common data demodulation reference signal in the superimposed streams of the plurality of user equipment; and an instruction generation unit is configured to indicate at least a first user device generates a power distribution coefficient streams corresponding to the plurality of user equipments on the respective user devices of the plurality of user devices, to assist the second superimposing a user data demodulation apparatus for multi-user transmission.
[Claim 15]
The apparatus according to claim 14, wherein the indication comprises a physical layer signaling.
[Claim 16]
The apparatus according to claim 14, wherein the insertion unit is further configured to control the common demodulation reference signal allocation full transmit power.
[Claim 17]
14-1 apparatus according to any of claims 16, wherein said apparatus is a base station, and said apparatus further comprising: a transmitting unit configured to demodulate a common reference signal and the indication of the transmitting to the at least first user device.
[Claim 18]
An apparatus for a user equipment-side multi-user wireless communications system in superposition transmission, the apparatus comprising: an equivalent channel estimation unit configured after superposition with respect to the user equipment and other user equipment from the base station demodulation reference signal and a demodulation reference signal for the indication of the other user equipment estimate data stream corresponding to the data stream corresponding to the user equipment and other user equivalent channel equivalent channel devices, wherein, on the said demodulation reference signal with respect to the user equipment and another user equipment demodulation reference signals are inserted in the data stream the respective user equipment, and the data stream of each user equipment by the base station at a particular transmit power, in the same transmitting the time-frequency resource without using a multi-output performance gain, and / or in the case of multi-input code division multiplexing; and a data demodulation unit configured in accordance with the estimated equivalent channel superimposed data transmission of a multi-user solution tune.
[Claim 19]
The apparatus according to claim 18, wherein the respective demodulation reference signal on the user device with different orthogonal codes, so that each user equipment on the respective demodulation reference signal is transmitted to the user equipment on the same resource element .
[Claim 20]
The apparatus according to claim 19, wherein each user equipment has only a single data stream supports only single demodulation reference signal data stream is inserted into the data stream the respective user equipment.
[Claim 21]
The apparatus according to claim 18, wherein the respective demodulation reference signal on the user device is assigned a certain transmission power, a demodulation reference signal and the superimposition is based on the assigned transmit power superimposed.
[Claim 22]
The apparatus according to claim 21, wherein, in a superimposed manner on a demodulation reference signal for each user device in a superimposed manner with the respective user data streams of different equipment.
[Claim 23]
The apparatus according to claim 21, wherein the transmit power allocated to the same data stream with a transmit power allocation demodulation reference signal of each user equipment to the user equipment.
[Claim 24]
The apparatus according to claim 18, wherein the equivalent channel estimation unit is further configured to obtain the indication of the physical layer signaling from the base station.
[Claim 25]
The apparatus according to claim 18, further comprising: a power distribution coefficient determining unit, configured according to the estimated equivalent channel and determining that the user device and the other user power allocation coefficient device, wherein said data demodulation unit is further configured to operate according to the determined power allocation coefficient data demodulation superimposed multi-user transmission.
[Claim 26]
The apparatus according to claim 25, wherein the data demodulation unit is further configured to power allocation coefficients based on the determined constellation recovery to demodulate transmitted data superimposed on a multi-user.
[Claim 27]
The apparatus according to claim 18, further comprising: a demodulation order determining unit is configured according to the estimated equivalent channel and determining that the user device and demodulating the data sequence of another user equipment, wherein said a data demodulation unit is further configured to demodulate data in accordance with the order determined superimposed data demodulation multi-user transmission.
[Claim 28]
The apparatus according to claim 27, wherein the data demodulation unit is further configured to demodulate the data according to the determined order of the nonlinear interference cancellation superimposed manner on the multi-user transmission data demodulation.
[Claim 29]
The apparatus according to claim 18, wherein the equivalent channel estimation unit is further configured to determine, according to the indication comprises a group of user devices the user equipment and the other user equipment sets the reference signal index, wherein the number of demodulation reference signal in the reference signal is set greater than or equal to the number of users of user equipment device group.
[Claim 30]
The apparatus according to claim 29, wherein the equivalent channel estimation unit is further configured to determine with respect to the user equipment according to information about the demodulation reference signal and the indication of the index included in demodulation reference signal of the other user equipment, and the data demodulation unit demodulates the transmission data is superimposed on the multi-user demodulation reference signal according to the determined.
[Claim 31]
The apparatus according to claim 29, wherein the equivalent channel estimation unit is further configured to determine an indication according to the indication mode on demodulation reference signal in the user equipment, the mode indication comprises a demodulation reference group indication signal scheme and a demodulation reference signal indicative conventional manner.
[Claim 32]
The apparatus according to claim 31, wherein the demodulation reference signal indicative of the way the at least one user equipment of the set of user equipment in a traditional demodulation reference signal for said indication manner.
[Claim 33]
The apparatus 18-1 according to any of claims 32, wherein said apparatus is a user of the apparatus, and the apparatus further comprising: a receiving unit configured to receive the superimposed from the demodulation of the base station reference signal and the indication.
[Claim 34]
An apparatus for a user equipment-side multi-user wireless communications system in superposition transmission, the apparatus comprising: an equivalent channel estimation unit configured to operate according to a common demodulation reference signal from the base station from the base station estimates after overlay data stream corresponding equivalent channel, wherein the common demodulation reference signal is inserted in said superposed to the data stream; and a data demodulation unit configured in accordance with the estimated equivalent channel from the base station, and indication of the power distribution coefficient of the user equipment and another user equipment demodulates the transmitted data is superimposed on the multi-user.
[Claim 35]
The apparatus according to claim 34, wherein the data demodulation unit is further configured according to the estimated equivalent channel and the indication that the user equipment corresponding to an equivalent data stream channel and the other data stream corresponding to the equivalent channel of the user equipment, and according to the equivalent channel of each user equipment determined demodulating data superimposed on the multi-user transmission.
[Claim 36]
The apparatus according to claim 35, wherein the data demodulation unit is further configured to demodulate the priority according to the indication a large power distribution coefficient data stream corresponding to the user equipment, in a nonlinear manner on the multi-user interference cancellation superimposing transmission data demodulation.
[Claim 37]
The apparatus according to claim 34, wherein the data demodulation unit is further configured to determine a power allocation coefficients of the user equipment to recover the constellation according to the indication, superimposed on the multi-user transmission data demodulation.
[Claim 38]
34-1 apparatus according to any of claim 37, wherein said apparatus is a user equipment, and the apparatus further comprising: a receiving unit configured to receive the base of the demodulation reference signal from a common and the indication.
[Claim 39]
A method for multi-user wireless communication system in superposition transmission for base station side, the method comprising: a data stream for each user in a group of user equipment devices comprises a plurality of user equipment are inserted in the data stream corresponding to the demodulation reference signal and superimposed data stream corresponding to each user equipment demodulation reference signal, wherein the data stream for each user equipment specific transmit power allocation to each user equipment so that the data stream at the same without the use of time-frequency resource MIMO gain performance and / or the plurality of user devices are transmitted to the case where the code division multiplexing; and generating a first user regarding the at least the plurality of user equipment devices said instruction data stream corresponding to the demodulation reference signal of the other user devices in a plurality of user equipments, the first user equipment to assist demodulating data superimposed on the multi-user transmission.
[Claim 40]
A method for multi-user wireless communication system in superposition transmission for base station side, the method comprising: inserting the common data demodulation reference signal in the superimposed streams of the plurality of user equipment; and a plurality of users generating at least a first user equipment an indication of the respective plurality of user equipment devices in the user power allocation coefficient data corresponding to the stream device, a first user device to assist the multi-user demodulating data superimposed transmission.
[Claim 41]
A method for a user equipment-side multi-user wireless communication system in superimposed for transmission, the method comprising: a demodulation reference signal is superimposed on the user equipment and the other user equipment from the base station and based on said on indicating the demodulation reference signal of the other user equipment estimate data stream corresponding to the data stream corresponding to the user equipment and other user equivalent channel equivalent channel devices, wherein the user equipment regarding a demodulation reference signal and demodulation reference signal on the other user devices are inserted in the data stream the respective user equipment, and the data stream of each user equipment in a particular transmit power, in the same time-frequency resource from said base station without using a multi-input multi-output performance gain of the transmission and / or in the case of code division multiplexing; and based on the estimated equivalent channel superimposed data demodulation multi-user transmission.
[Claim 42]
A method for a user equipment-side multi-user wireless communication system in superimposed for transmission, the method comprising: estimating the equivalent channel from the base station is superimposed upon a corresponding data stream according to a common demodulation reference signal from a base station wherein the common demodulation reference signal is inserted in said superposed to data stream; and an instruction on the estimated equivalent channel and the partition coefficient with respect to the user equipment and another user equipment and power from the base station multi-user demodulating data superimposed transmission.