Base station device, terminal device, communication method, and communication system
Technical field
[0001]
　The present invention relates to base station devices, terminal devices, communication methods, and communication systems.
Background technology
[0002]
　In the current network, the traffic of mobile terminals (smartphones and future phones) occupies most of the network resources. In addition, the traffic used by mobile terminals tends to increase in the future.
[0003]
　On the other hand, in line with the development of IoT (Internet of Things) services (for example, monitoring systems for transportation systems, smart meters, devices, etc.), it is required to support services with various requirements. Therefore, in the communication standard of the 5th generation mobile communication (5G or NR (New Radio)), in addition to the standard technology of 4G (4th generation mobile communication), the data rate is further increased, the capacity is increased, and the capacity is lowered. There is a demand for technology that realizes delays. Regarding the 5th generation communication standard, technical studies are being carried out by the 3GPP working group (for example, TSG-RAN WG1, TSG-RAN WG2, etc.).
[0004]
　In order to support a wide variety of services, 5G has many use cases classified into, for example, eMBB (Enhanced Mobile BroadBand), Massive MTC (Machine Type Communications), and URLLC (Ultra-Reliable and Low Latency Communication). Assuming support. In particular, URLLC is one of the use cases that is difficult to realize because it requires ultra-high reliability and low delay.
[0005]
　Further, in 5G, it is required that ultra-high reliability and low delay communication data (URLLC data) and other data (for example, eMBB data) can be supported simultaneously by the same carrier, and frequency utilization efficiency is required to realize this. It is desirable not to impair.
[0006]
　The technology related to 5G is described in the following prior art documents.
Advanced technical literature
Non-patent literature
[0007]
Non-licensed document 1: 3GPP TS 36.211 V15.0.0 (2017-12)
Non-licensed document 2: 3GPP TS 36.212 V15.0.1 (2018-01)
Non-licensed document 3: 3GPP TS 36.213 V15.0.0 (2017-12)
Non-licensed document Document 4: 3GPP TS 36.300 V15.0.0 (2017-12)
Non-Patent Document 5: 3GPP TS 36.321 V15.0.0 (2017-12)
Non-Patent Document 6: 3GPP TS 36.322 V15.0.0 (2017-12)
Non-Patent Document 7 : 3GPP TS 36.323 V14.5.0 (2017-12)
Non-Patent Document 8: 3GPP TS 36.331 V15.0.1 (2018-01)
Non-Patent Document 9: 3GPP TS 36.413 V15.0.0 (2017-12)
Non-Patent Document 10: 3GPP TS 36.423 V15.0.0 (2017-12)
Non-Patent Document 11: 3GPP TS 36.425 V14.0.0 (2017-03)
Non-Patent Document 12: 3GPP TS 37.340 V15.0.0 (2017-12)
Non-Patent Document 13: 3GPP TS 38.201 V15.0.0 (2017-12)
Non-Patent Document 14: 3GPP TS 38.202 V15.0.0 (2017-12 )
Non-Patent Document 15: 3GPP TS 38.211 V15.0.0 (2017-12 )
Non-Patent Document 16: 3GPP TS 38.212 V15.0.0 (2017-12 )
Non-Patent Document 17: 3GPP TS 38.213 V15.0.0 (2017-12)
Non-patent document 18: 3GPP TS 38.214 V15.0.0 (2017-12)
Non-patent document 19: 3GPP TS 38.215 V15.0.0 (2017-12)
Non-patent document 20 : 3GPP TS 38.300 V15.0.0 (2017-12) Unlicensed
Document 21: 3GPP TS 38.321 V15.0.0 (2017-12) Unlicensed
Document 22: 3GPP TS 38.322 V15.0.0 (2017-12) Unlicensed
Document 23: 3GPP TS 38.323 V15.0.0 (2017-12) Unlicensed
Document 24: 3GPP TS 38.331 V15.0.0 (2017-12) Unlicensed
Document 25: 3GPP TS 38.401 V15.0.0 (2017-12) Unlicensed
Document 26: 3GPP TS 38.410 V 0.6.0 (2017-12)
Non-licensed literature 27: 3GPP TS 38.413 V0.5.0 (2017-12)
Non-licensed literature 28: 3GPP TS 38.420 V0.5.0 (2017-12)
Non-licensed literature 29: 3GPP TS 38.423 V0.5.0 (2017-12)
Non -licensed literature Document 30: 3GPP TS 38.470 V15.0.0 (2018-01)
Non-patent document 31: 3GPP TS 38.473 V15.0.0 (2017-12)
Non-patent document 32: 3GPP TR 38.801 V14.0.0 (2017-04)
Non-patent document 33 : 3GPP TR 38.802 V14.2.0 (2017-09)
Non-Patent Document 34: 3GPP TR 38.803 V14.2.0 (2017-09)
Non-Patent Document 35: 3GPP TR 38.804 V14.0.0 (2017-03)
Non-Patent Document 36: 3GPP TR 38.900 V14.3.1 (2017-07)
Non-licensed document 37: 3GPP TR 38.912 V14.1.0 (2017-06)
Non-licensed document 38: 3GPP TR 38.913 V14.3.0 (2017-06)
非特許文献39 : ”New SID Proposal: Study on New Radio Access Technology”, NTT docomo, RP-160671, 3GPP TSG RAN Meeting #71, Goteborg, Sweden, 7.-10. March, 2016
非特許文献40 : ”On co-existence of eMBB and URLLC ”, NTT docomo, R1-167391, 3GPP TSG RAN WG1 Meeting #86, Gothenburg, Sweden 22nd - 26th August 2016
Outline of the invention
Problems to be solved by the invention
[0008]
　URLLC is expected to transmit, for example, small size data. However, if the data size is small, the proportion of the header portion in the transmitted message becomes large, and the overhead due to transmitting the header portion becomes large. In this case, the low delay required by URLLC may not be realized.
[0009]
　Therefore, one object of the disclosure is to provide a base station device, a terminal device, a communication method, and a communication system that reduce the overhead caused by transmitting the header unit.
Means to solve problems
[0010]
　A transmission unit that transmits the first data of the first type and the second data of the second type using a plurality of logical channels, and the transmission unit multiplexes and transmits the first data and the second data. At that time, the second data has a control unit capable of adding a MAC header in which the information of the logical channel number or the data length is omitted.
The invention's effect
[0011]
　One disclosure can reduce the overhead of transmitting the header section.
A brief description of the drawing
[0012]
FIG. 1 is a diagram showing a configuration example of a communication system 10.
FIG. 2 is a diagram showing a configuration example of a communication system 10.
FIG. 3 is a diagram showing an example of URLLC interrupt transmission in eMBB.
FIG. 4 is a diagram showing a configuration example of the base station apparatus 200.
FIG. 5 is a diagram showing a configuration example of a terminal device 100.
FIG. 6 is a diagram showing an example of a sequence of data transmission processing.
FIG. 7 is a diagram showing an example of MAC header pattern 1.
FIG. 8 is a diagram showing an example in which URLLC data is transmitted using the MAC header pattern 1.
FIG. 9 is a diagram showing an example of a MAC header pattern.
FIG. 10 is a diagram showing an example in which URLLC data is transmitted using the MAC header pattern 2.
FIG. 11 is a diagram showing an example of a pattern in which an R bit is set as a part of the LCMAP.
FIG. 12 is a diagram showing an example of MAC header pattern 3.
[Fig. 13] Fig. 13 is a diagram showing an example in which URLLC data is transmitted using the MAC header pattern 3.
FIG. 14 is a diagram showing an example of LCMAP pattern 5.
FIG. 15 is a diagram showing an example in which URLLC data is transmitted using the LCMAP pattern 5 in the MAC header pattern 2.
FIG. 16 is a diagram showing an example in which URLLC data is transmitted using the LCMAP pattern 5 in the MAC header pattern 2.
FIG. 17 is a diagram showing an example of MAC header pattern 4.
FIG. 18 is a diagram showing an example in which URLLC data is transmitted using the MAC header pattern 4.
FIG. 19 is a diagram showing LCID numbers and corresponding data types.
Mode for carrying out the invention
[0013]
　Hereinafter, the present embodiment will be described in detail with reference to the drawings. The issues and examples in this specification are examples, and do not limit the scope of rights of the present application. In particular, even if the described expressions are different, the techniques of the present application can be applied even if they are technically equivalent, and the scope of rights is not limited.
[0014]
　[First Embodiment]
　First, the first embodiment will be described.
FIG. 1 is a diagram showing a configuration example of the communication system 10. The base station device 200 transmits the first data and the second data to a communication partner device (not shown).
[0015]
　The base station device 200 has a transmission unit 290 and a control unit 291. The transmission unit 290 and the control unit 291 are constructed by, for example, a computer or a processor of the base station apparatus 200 loading and executing a program.
[0016]
　The base station device 200 is a device for transmitting data, for example, gNodeB in 5G. The base station apparatus 200 transmits the first data of the first type (for example, eMBB) and the second data of the second type (for example, URLLC). The base station device 200 may multiplex and transmit the first data and the second data.
[0017]
　The transmission unit 290 transmits the first data and the second data using a plurality of logical channels. For example, when a transmission opportunity for the second data occurs during the transmission of the first data, the transmission unit 290 multiplexes and transmits the first data and the second data.
[0018]
　When the transmission unit 290 multiplexes and transmits the first data and the second data, the control unit 291 can omit the logical channel number (LCID: Logical Chanel Identifier) ​​included in the MAC header of the second data.
[0019]
　Further, the control unit 291 has a data length (L) indicating the size (length) of the data unit included in the MAC header of the second data when the transmission unit 290 multiplexes and transmits the first data and the second data. : Length) can be omitted.
[0020]
　As a result, the base station apparatus 200 can suppress the amount of data in the MAC header and reduce the overhead due to the transmission of the header portion.
[0021]
　[Second Embodiment]
　Next, the second embodiment will be described.
[0022]
　
　FIG. 2 is a diagram showing a configuration example of the communication system 10. The communication system 10 has a terminal device 100 and a base station device 200. The communication system 10 is, for example, a communication system for wireless communication conforming to 5G. Further, the communication system 10 is a communication system compliant with the protocol stack shown below.
[0023]
　In the communication standard of a wireless communication system, specifications are generally defined as a protocol stack (also referred to as a hierarchical protocol) in which a wireless communication function is divided into a series of layers. For example, the physical layer is defined as the first layer, the data link layer is defined as the second layer, and the network layer is defined as the third layer. In the 4th generation mobile communication system such as LTE, the second layer is divided into a plurality of sublayers, from the MAC (Medium Access Control) layer, the RLC (Radio Link Control) layer, and the PDCP (Packet Data Convergence Protocol) layer. It is composed. Further, in the 4th generation mobile communication system, the first layer is composed of a PHY (Physical) layer, and the third layer is composed of an RRC (Radio Resource Control) layer (the RRC layer is only a control plane).
[0024]
　Each layer in the transmission device of the wireless communication system performs processing conforming to a predetermined protocol such as adding a header to a data block (also called a service data unit (SDU)) from an upper layer. By doing so, a protocol data unit (PDU), which is an information unit exchanged between peer processes in the receiving device, is generated and transferred to a lower layer. For example, in the LTE RLC layer, PDCP-PDU, which is a data block from the PDCP layer, which is the upper layer, is set as RLC-SDU, and a plurality of RLC-SDUs are within the TB (Transport Block) length notified from the lower layer. RLC-PDU is generated by concatenating. Such an RLC-PDU is transferred to a lower layer, a MAC layer, with an RLC header having a sequence number (SN) in the RLC layer.
[0025]
　Each layer in the receiving device of the wireless communication system receives the data block (also referred to as PDU) from the lower layer and removes the header to take out the data block (also referred to as SDU) to the upper layer. Forward. For example, in RLC of LTE, it is stored in one RLC-PDU with reference to the RLC header attached to the data block (also referred to as MAC-SDU or RLC-PDU) from the MAC layer which is a lower layer. Processing such as reconstructing a plurality of RLC-SDUs is performed, and the RLC-SDU is transferred to the PDCP layer which is an upper layer. At that time, in order to compensate the order of RLC-SDU for the upper layer, in the reconstruction of RLC-SDU, an ordering process based on the RLC sequence number of the RLC header is performed. Then, when it is detected that the RLC sequence number is missing, the RLC retransmission control for requesting the transmission device to retransmit the RLC-PDU is executed.
[0026]
　When the base station device 200 receives the data transmitted from the network (not shown) to the terminal device 100, the base station device 200 transmits the data to the terminal device 100 via radio. The base station device 200 is, for example, a 5G compliant gNodeB.
[0027]
　The terminal device 100 is a mobile communication terminal such as a smartphone or a tablet terminal that communicates with the base station device 200 or with another communication device via the base station device 200.
[0028]
　The base station device 200 uses, for example, a part of the resource for transmitting the eMBB when transmitting the URLLC data to the terminal device 100.
[0029]
　FIG. 3 is a diagram showing an example of URLLC interrupt transmission in eMBB. The base station apparatus 200 can interrupt (puncture) URLLC by using the eMBB data punctureable area which is a part of the data area for transmitting eMBB. The base station apparatus 200 transmits URLLC using, for example, message M1. In message M1, "P" indicates a Preemption Indicator. The Preemption Indicator is an identifier for identifying that the data (D in FIG. 3) is not eMBB data, and is, for example, a part or all of a message header. Note that interrupt transmission may use a plurality of areas of the eMBB data punctureable area, or may use a part of the area.
[0030]
　
　FIG. 4 is a diagram showing a configuration example of the base station device 200. The base station device 200 includes a CPU (Central Processing Unit) 210, a storage 220, a memory 230 such as a DRAM (Dynamic Random Access Memory), a NIC (Network Interface Card) 240, and an RF (Radio Frequency) circuit 250. The base station device 200 is, for example, a transmission device that transmits URLLC data to the terminal device 100.
[0031]
　The storage 220 is an auxiliary storage device such as a flash memory, an HDD (Hard Disk Drive), or an SSD (Solid State Drive) that stores programs and data. The storage 220 stores the communication control program 221 and the header pattern 222.
[0032]
　The header pattern 222 is an area for storing the header patterns shown below. The header pattern 222 may be incorporated into the program.
[0033]
　The memory 230 is an area for loading a program stored in the storage 220. The memory 230 is also used as an area for the program to store data.
[0034]
　The NIC 240 is a network interface that connects to a network (not shown) such as the Internet or an intranet. The base station device 200 communicates with a communication device connected to the network via the NIC 240.
[0035]
　The RF circuit 250 is a device that wirelessly connects to the terminal device 100. The RF circuit 250 has, for example, an antenna 251.
[0036]
　The CPU 210 is a processor or computer that loads a program stored in the storage 220 into the memory 230, executes the loaded program, and realizes each process.
[0037]
　The CPU 210 executes the communication control program 221 to construct a transmission unit and a control unit, and performs communication control processing. The communication control process is a process for controlling wireless communication with the terminal device 100. The base station device 200 transmits eMBB data (hereinafter, may be referred to as eMBB data) and URLLC data (hereinafter, may be referred to as URLLC data) to the terminal device 100 in the communication control process. Further, the base station device 200 multiplexes the eMBB data and the URLLC data in the communication control process, selects a header pattern of the URLLC data, and notifies the terminal device 100 of the selected header pattern.
[0038]
　The CPU 210 constructs a transmission unit and performs eMBB transmission processing by executing the eMBB transmission module 2211 included in the communication control program 221. The eMBB transmission process is a process of transmitting eMBB data to the terminal device 100.
[0039]
　The CPU 210 constructs a transmission unit and performs a URLLC transmission process by executing the URLLC transmission module 2212 included in the communication control program 221. The URLLC transmission process is a process of transmitting URLLC data to the terminal device 100.
[0040]
　The CPU 210 constructs a transmission unit and performs multiplexing processing by executing the multiplexing module 2213 included in the communication control program 221. The multiplexing process is a process for multiplexing eMBB data and URLLC data. The base station apparatus 200 performs multiplexing by interrupting the URLLC data into a part of the eMBB data punctureable area in the multiplexing process.
[0041]
　The CPU 210 constructs a control unit and performs a header pattern selection process by executing the header pattern selection module 2214 included in the communication control program 221. The header pattern selection process is, for example, a process of selecting a header pattern of URLLC data. For example, when multiplexing eMBB data and URLLC data, the base station apparatus 200 selects a header pattern according to the characteristics of the URLLC data to be transmitted.
[0042]
　
　FIG. 5 is a diagram showing a configuration example of the terminal device 100. The terminal device 100 includes a CPU 110, a storage 120, a memory 130 such as a DRAM, and an RF circuit 150. The terminal device 100 is, for example, a receiving device that receives URLLC data from the base station device 200.
[0043]
　The storage 120 is an auxiliary storage device such as a flash memory, an HDD, or an SSD that stores programs and data. The storage 120 stores the communication program 121 and the header pattern 122.
[0044]
　The header pattern 122 is an area for storing the header patterns shown below. The header pattern 122 may be incorporated into the program. Further, the header pattern 122 may be the same as the header pattern 222 of the base station apparatus 200, for example.
[0045]
　The memory 130 is an area for loading a program stored in the storage 120. The memory 130 is also used as an area for the program to store data.
[0046]
　The RF circuit 150 is a device that wirelessly connects to the base station device 200. The RF circuit 150 has, for example, an antenna 151.
[0047]
　The CPU 110 is a processor or computer that loads a program stored in the storage 120 into the memory 130, executes the loaded program, and realizes each process.
[0048]
　By executing the communication program 121, the CPU 110 constructs a reception unit and a reception control unit, and performs communication processing. The communication process is a process of wirelessly communicating with the base station device 200. The terminal device 100 receives eMBB data and URLLC data (including multiplexed data) in the communication process. Further, the terminal device 100 acquires the header pattern of the URLLC data when the eMBB data and the URLLC data are multiplexed in the communication process from the base station device 200.
[0049]
　The CPU 110 constructs a receiving unit and performs eMBB receiving processing by executing the eMBB receiving module 1211 included in the communication program 121. The eMBB reception process is a process of receiving eMBB data from the base station apparatus 200.
[0050]
　The CPU 110 constructs a receiving unit and performs a URLLC receiving process by executing the URLLC receiving module 1212 included in the communication program 121. The URLLC reception process is a process of receiving URLLC data from the base station apparatus 200.
[0051]
　The CPU 110 constructs a control unit and performs a header pattern acquisition process by executing the header pattern acquisition module 1213 included in the communication program 121. The header pattern acquisition process is a process of acquiring the header pattern selected by the base station apparatus 200. In the header pattern acquisition process, the terminal device 100 acquires the header pattern by receiving the header pattern notified from the base station device 200. The terminal device 100 can receive the URLLC data multiplexed with the eMBB data by acquiring the header pattern.
[0052]
　
　FIG. 6 is a diagram showing an example of a sequence of data transmission processing. The base station apparatus 200 determines a header pattern to be used (hereinafter referred to as a header pattern to be used) when an opportunity to transmit data to the terminal apparatus 100 occurs (S10). The base station apparatus 200 determines the header pattern to be used, for example, based on whether or not the data to be transmitted is URLLC. The URLLC data is, for example, fixed-length data. Further, the URLLC data is, for example, data having a data size smaller than a predetermined value and a data size smaller than the eMBB data.
[0053]
　The base station device 200 transmits the determined used header pattern to the terminal device 100 using RRC signaling (S11). RRC signaling is, for example, a control signal containing information for transmitting and receiving RRC messages. The base station apparatus 200 uses the message or signal received by the terminal apparatus 100, not limited to RRC signaling, for the transmission of the determined header pattern.
[0054]
　The terminal device 100 receives the RRC signaling and acquires the used header pattern (S12). After that, the terminal device 100 waits for data transmitted from the base station device 200 in the used header pattern.
[0055]
　The base station device 200 notifies the terminal device 100 of the used header pattern, and then transmits data to the terminal device 100 using the determined used header pattern.
[0056]
　
　An example of the used header pattern in the MAC header will be described below. One line in the following format indicates one octet. Further, 1 octet will be described below as 1 byte (8 bits).
[0057]
　<1. MAC basic pattern>
　basic pattern is, for example, a general-purpose header pattern used for transmitting any data. The MAC header pattern 1, which is a basic MAC pattern, will be described below.
[0058]
　FIG. 7 is a diagram showing an example of the MAC header pattern 1. R indicates an R bit (Reserved). The R bit (reserve bit) is, for example, an area reserved for ensuring expandability in order to respond to future specification changes.
[0059]
　The LCID is a Logical Channel Identifier. The LCID indicates, for example, the number of the logical channel assigned between the base station device 200 and the terminal device 100. The storage area of ​​the LCID is composed of 6 bits.
[0060]
　L is the data length (Length). The storage area of ​​L is composed of 8 bits. Further, the storage area of ​​L may be composed of 16 bits.
[0061]
　In the MAC header pattern 1, 0 is set in the second bit of the first octet. 0 is a fixed value.
[0062]
　FIG. 8 is a diagram showing an example in which URLLC data is transmitted using the MAC header pattern 1. For example, eight logical channels are set, and the logical channel numbers are 2, 3, 4, 5, 12, 13, 14, and 15. Unless otherwise specified, the number and number of logical channels shall be the same in the following description.
[0063]
　In FIG. 8, URLLC data (URLLC LCID = x (x is a logical channel number) in FIG. 8) is added to the header of the MAC header pattern 1. In FIG. 8, one header is added to one URLLC data. Each URLLC data is transmitted using logical channel numbers 2, 5 and 14. In L, the data length of each URLLC data is set.
[0064]
　<2. LCID mapping>
　For example, when the number of logical channels is small (for example, 8 or less), the mapping information that maps the logical channels to be used is used instead of the LCID set in the header part of each data. Further, in the base station apparatus 200, when the URLLC has a fixed length, the data length may be omitted.
[0065]
　FIG. 9A is a diagram showing an example of the MAC header pattern 2. LCMAP is mapping information that maps logical channel numbers.
[0066]
　FIG. 9B is a diagram showing an example of LCMAP pattern 1. The LCMAP is, for example, mapping information, and is composed of 8 bits of L1 to L8. Each Lx (x is an integer) corresponds to a logical channel number. The base station apparatus 200 associates the logical channel numbers to be used with Lx in ascending order. For example, in the base station apparatus 200, L1 corresponds to LCID2, L2 corresponds to LCID3, L3 corresponds to LCID4, L4 corresponds to LCID5, L5 corresponds to LCID12, L6 corresponds to LCID13, L7 corresponds to LCID14, and L8 corresponds to LCID15. Then, the base station apparatus 200 turns on (1) the bit corresponding to the LCID number to be used. The logical channel to be used may correspond to Lx in descending order.
[0067]
　FIG. 10 is a diagram showing an example in which URLLC data is transmitted using the MAC header pattern 2. The data to be transmitted is the same as in FIG. In FIG. 10, one 1-octet header and 3 URLLC data are transmitted. In the header, L1, L4, and L7 are 1 (ON). That is, it indicates that URLLC data is transmitted using LCID2 corresponding to L1, LCID5 corresponding to L4, and LCID14 corresponding to L7.
[0068]
　FIG. 11 is a diagram showing an example of a pattern in which the R bit is set in a part of the LCMAP. FIG. 11A is a diagram showing an example of LCMAP pattern 2. The LCMAP pattern 2 is an LCMAP pattern in which the R bit is set at the beginning and L8 is not set. The base station apparatus 200 may use the LCMAP pattern 2 when the number of logical channels used is 7 or less.
[0069]
　FIG. 11B is a diagram showing an example of LCMAP pattern 3. The LCMAP pattern 3 is an LCMAP pattern in which a plurality of R bits are set. LCMAP pattern 3 does not set L7 and L8. The base station apparatus 200 may use the LCMAP pattern 3 when the number of logical channels used is 6 or less.
[0070]
　FIG. 11C is a diagram showing an example of LCMAP pattern 4. The LCMAP pattern 4 is an LCMAP pattern in which R bits are set at the beginning and the end and L7 and L8 are not set. The base station apparatus 200 may use the LCMAP pattern 3 when the number of logical channels used is 6 or less.
[0071]
　FIG. 11 is an LCMAP pattern in which 1 or 2 R bits are set. However, the R bit may be set to 3 or more. Further, as shown in FIG. 11, the position of the R bit is not limited to the first, last, and second bits, and may be set to any position. The base station apparatus 200 may change the number of R bits to be set according to the number of logical channels used.
[0072]
　<2.1
　Addition of data length> When the URLLC has a variable length, the base station apparatus 200 assigns a data length. The base station device 200, for example, assigns N-1 data lengths when transmitting N (N is an integer) URLLC data. This is because the end of the final data is the end of the MAC PDC transport block even if there is no information about the data length.
[0073]
　FIG. 12 is a diagram showing an example of the MAC header pattern 3. The MAC header pattern 3 has, for example, two 1-octet L regions in addition to the LCMAP. The L region may be, for example, the data length of the URLLC data to be transmitted, or may indicate the boundary position (end or beginning) of the MAC SDU data.
[0074]
　FIG. 13 is a diagram showing an example in which URLLC data is transmitted using the MAC header pattern 3. The data to be transmitted is the same as in FIG. In FIG. 13, the base station apparatus 200 transmits one one-octet header and three URLLC data. When the LCMAP of the header corresponds to the LCMAP pattern 1, L1, L4, and L7 are 1 (ON). That is, it indicates that URLLC data is transmitted using LCID2 corresponding to L1, LCID5 corresponding to L4, and LCID14 corresponding to L7. Further, the data length included in the header is L = 00010000, which indicates that it is 32 bytes. That is, it is shown that the data length of the URLLC data transmitted by LCID2 and the data length of the URLLC data transmitted by LCID5 are 32 bytes, respectively. The end of the URLLC data transmitted by LCID 14 is the end of the transport block of MAC PDC.
[0075]
　In FIGS. 12 and 13, two L regions are set, but three or more may be set. Further, the L region may be set to N instead of N-1.
[0076]
　<2.2 Header Pattern Identifier> The
　base station apparatus 200 may assign an identifier indicating the header pattern to be used. For example, the base station apparatus 200 is provided with a header pattern for setting the LCID to be used as it is (for example, MAC header pattern 1 in FIG. 7) and a bit for identifying the header pattern for setting the mapped information element instead of the LCID. ..
[0077]
　FIG. 14 is a diagram showing an example of LCMAP pattern 5. The second bit of the LCMAP pattern 5 is a MID bit. The MID bit is a bit indicating whether or not to use the mapped information element, and is used as a header identifier that identifies a header pattern. For the second bit of the first octet of the MAC header, for example, in the MAC header pattern 1 of FIG. 7, a fixed value of 0 is set. When the second bit (MID bit) of the first octet of the MAC header is 1, the terminal device 100 recognizes that the header uses a mapped information element instead of the LCID. That is, the MID bit of the LCMAP pattern 5 is 1.
[0078]
　FIG. 15 is a diagram showing an example in which URLLC data is transmitted using the LCMAP pattern 5 in the MAC header pattern 2. The base station apparatus 200 uses LCID2 to transmit one URLLC data.
[0079]
　FIG. 15A is a diagram showing an example in which URLLC data is transmitted using the LCMAP pattern 5 in the MAC header pattern 2. In FIG. 15A, the LCMAP of the header has a MID of the second bit of 1. Therefore, the terminal device 100 recognizes that the URLLC data has been transmitted in the LCMAP pattern 5. Then, LCMAP indicates that L1 is ON and URLLC is transmitted using LCID2.
[0080]
　FIG. 15B is a diagram showing an example of a pattern in which the MAC header is omitted. When the base station apparatus 200 uses one logical channel, the MAC header may be omitted.
[0081]
　FIG. 16 is a diagram showing an example in which URLLC data is transmitted using the LCMAP pattern 5 in the MAC header pattern 2. The base station apparatus 200 uses LCID2 and LCID5 to transmit two URLLC data. The LCMAP of the header has a MID of the second bit of 1. Therefore, the terminal device 100 recognizes that the URLLC data has been transmitted in the LCMAP pattern 5. Then, LCMAP indicates that L1 and L4 are ON, and URLLC is transmitted using LCID2 and LCID5, respectively.
[0082]
　The MID may identify, for example, user data or control data.
[0083]
　By providing an identifier of the header pattern, data can be transmitted by using, for example, a MAC CE (control element) which is a control signal of the MAC layer. The base station device 200 makes the terminal device 100 recognize that data is transmitted using the resources of the MAC CE by turning on (1) the second bit of the first octet of the MAC header of the MAC CE. be able to.
[0084]
　<2.3 Omission of data length> When
　the URLLC has a fixed length, the base station apparatus 200 may omit the data length.
[0085]
　FIG. 17 is a diagram showing an example of the MAC header pattern 4. The MAC header pattern 4 is a pattern in which the data length of the MAC header pattern 1 is omitted. Also, the R bit is set in the second bit of the first octet.
[0086]
　FIG. 18 is a diagram showing an example in which URLLC data is transmitted using the MAC header pattern 4. The base station device 200 sets LCID2 in the LCID area of ​​the header, and transmits URLLC data using LCID2.
[0087]
　[Other Embodiments] In the
　communication system 10, for example, an LCID that uses the header shown above may be defined.
[0088]
　FIG. 19 is a diagram showing LCID numbers and corresponding data types. FIG. 19 (A) is a diagram showing an example of the definition of downlink, and FIG. 19 (B) is a diagram showing an example of the definition of uplink.
[0089]
　In FIG. 19A, LCID numbers (Index) from 10001 to x (x is a numerical value less than 110111) are defined as LCIDs (Identity of the logical channel for URLLC) for URLLC. Similarly, in FIG. 19B, the LCID numbers from 10001 to x (x is a numerical value less than 110110) are defined as LCIDs for URLLC. As a result, the base station apparatus 200 can omit a part or all of the header.
[0090]
　In addition, URLLC may not perform concatenation at the MAC layer. In the communication system 10, for example, an information element indicating the presence or absence of coupling at the MAC layer may be added.
[0091]
　Moreover, each embodiment may be combined individually. For example, the omission of the data length and the setting of the R bit may be performed in each embodiment.
Description of the sign
[0092]
10: Communication system
100: Terminal device
110: CPU
120: Storage
121: Communication program
122: Header pattern
130: Memory
150: RF circuit
151: Antenna
200: Base station device
210: CPU
220: Storage
221: Communication control program
222: Header pattern
230: Memory
250: RF circuit
251: Antenna
290: Transmission unit
291: Control unit
1211: eMBB reception module
1212: URLLC reception module
1213: Header pattern acquisition module
2211: eMBB transmission module
2212: URLLC transmission module
2213: Multiplexing Module
2214: Header pattern selection module
The scope of the claims
[Request item 1]
　A transmission unit that transmits the first data of the first type and the second data of the second type using a plurality of logical channels, and the
　transmission unit multiplexes and transmits the first data and the second data. A
　base station device having a control unit capable of adding a MAC header in which the information of the logical channel number or the data length is omitted to the second data .
[Request item 2]
　The first aspect of the present invention is that, when the control unit adds a MAC header in which the logical channel number is omitted, mapping information having a plurality of bits corresponding to each of the plurality of logical channels is added to the MAC header. The base station device described.
[Request item 3]

　The base station device according 　to claim 2 , wherein the control unit turns on the bit corresponding to the logical channel number for transmitting the second data among the plurality of bits .
[Request item 4]

　The base station apparatus according to claim 1 　, wherein the control unit omits an information element relating to the data length included in the MAC header when the data length of the second data is fixed .
[Request 5]

　The base station device according 　to claim 1 , wherein the control unit further assigns a header identifier that identifies a pattern of the MAC header to be used to the MAC header .
[Request 6]
　The base station apparatus according
　　to
claim 5 　, wherein the control unit turns on the header identifier when omitting the logical channel number included in the MAC header of the second data .
[Request 7]

　The base station apparatus according to claim 1 　, wherein the second data has a fixed length .
[Request 8]

　The base station apparatus 　according to claim 6 , wherein the second type includes URLLC .
[Request item 9]

　The base station apparatus 　according to claim 7 , wherein the first type includes eMBB .
[Request item 10]

　The base station apparatus according to claim 　1, wherein the second data has a data size smaller than that of the first data .
[Request 11]

　The base station device according 　to claim 1 , wherein the control unit notifies the device to which the second data is transmitted of information regarding the format of the MAC header used for transmitting the second data .
[Request 12]
　A receiving unit capable of receiving the first type first data and the second type second data transmitted using a plurality of logical channels, and the first data in which the
　receiving unit is multiplexed. And a reception control unit that takes out the data having the MAC header included in the area of ​​the first data and omitting the information of the logical channel number or the data length as the second data when receiving the second data. a
　terminal device.
[Request 13]
　When the first data of the first type and the second data of the second type are transmitted using a plurality of logical channels and
　the first data and the second data are multiplexed in the transmission, the first type is described. 2
　A communication method in a base station device in which a MAC header in which information on a logical channel number or data length is omitted is added to data .
[Request 14]
　A transmission unit that transmits the first data of the first type and the second data of the second type using a plurality of logical channels, and the transmission unit multiplexes and transmits the first data and the second data. At that time, the second data was
　transmitted using the base station apparatus having a control unit capable of adding a MAC header in which the information of the logical channel number or the data length is omitted, and the plurality of logical channels. When the receiving unit that receives the first data and the second data and the receiving unit receives the multiplexed first data and the second data, the MAC included in the area of ​​the first data.
　A communication system including a terminal device having a reception control unit that extracts data having a header as the second data .