WO2017054583A1 - 多用户协作通信的下行控制信息传输方法、基站和用户设备 - Google Patents

多用户协作通信的下行控制信息传输方法、基站和用户设备 Download PDF

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Publication number
WO2017054583A1
WO2017054583A1 PCT/CN2016/095341 CN2016095341W WO2017054583A1 WO 2017054583 A1 WO2017054583 A1 WO 2017054583A1 CN 2016095341 W CN2016095341 W CN 2016095341W WO 2017054583 A1 WO2017054583 A1 WO 2017054583A1
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Prior art keywords
dci
user equipment
base station
cooperative
mac pdu
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PCT/CN2016/095341
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English (en)
French (fr)
Inventor
何青春
谢峰
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中兴通讯股份有限公司
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Publication of WO2017054583A1 publication Critical patent/WO2017054583A1/zh

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/12—Wireless traffic scheduling
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/20—Control channels or signalling for resource management
    • H04W72/23—Control channels or signalling for resource management in the downlink direction of a wireless link, i.e. towards a terminal

Definitions

  • the present application relates to, but is not limited to, the field of mobile communications, and in particular, to a downlink control information transmission method, a base station, and a user equipment for multi-user cooperative communication.
  • a base station In a wireless cellular communication system, a base station (eNB or a base station) is a device that provides wireless access for a user equipment (User Equipment, UE, also referred to as a terminal terminal), and the base station and the user equipment perform wireless communication by electromagnetic waves.
  • Multiple User Cooperative Communication is a technology for improving the throughput of a certain UE by cooperation among multiple User Equipments (UEs) in an LTE (Long Term Evolution) system.
  • the two UEs that cooperate are called Cooperate User Equipment (C-UE) and the other is called Benefit User Equipment (B-UE).
  • the cooperative user equipment serves as a data relay between the base station and the benefit user equipment, and is backward compatible with the air interface technology of the benefit user equipment, and forwards the wireless service between the base station and the benefit user equipment.
  • the base station does not directly perform wireless services with the benefit user equipment, but is implemented by relay forwarding of the cooperative user equipment, and the multi-user cooperative communication is converted into a single-hop communication between the traditional base station and the user equipment.
  • the user equipment independently schedules the benefit user equipment; the third type is that the cooperative user equipment assists the base station to forward the scheduling control information to the benefit user equipment.
  • the base station cannot directly send the scheduling control information to the benefit user equipment, and the cooperative user equipment is required to assist the base station to forward the scheduling control information to the benefit user equipment, so as to reduce the scheduling signaling overhead between the base station and the coordinated user equipment.
  • the transmission mode of the scheduling control signaling needs to be optimized.
  • the embodiments of the present invention provide a downlink control information transmission method, a base station, and a user equipment for multi-user cooperative communication, which can overcome the problem of excessive signaling overhead when directly transmitting scheduling control information between a base station and a coordinated user equipment.
  • the embodiment of the invention provides a downlink control information (DCI) transmission method for multi-user cooperative communication, which includes:
  • the base station sends a DCI including the base station scheduling benefit user equipment to the cooperative user equipment.
  • the DCI adopts a backward compatible DCI format.
  • the DCI is a dynamic or semi-statically scheduled DCI.
  • the DCI is sent through a Cooperative Media Access Control Protocol Data Unit (MAC PDU) data packet.
  • MAC PDU Cooperative Media Access Control Protocol Data Unit
  • the cooperative MAC PDU data packet includes a cooperative MAC header, a cooperative MAC CE, and/or a MAC PDU of a benefit user equipment.
  • the base station adds a padding bit after the MAC PDU of the benefit user equipment of the cooperative MAC PDU, so that the size of the coordinated MAC PDU data packet matches the transmission resource block.
  • the cooperative MAC PDU data packet is carried on a physical downlink shared channel (PDSCH).
  • PDSCH physical downlink shared channel
  • the cooperative MAC CE carries the DCI.
  • the format of the DCI carried by the cooperative MAC CE is a whole byte; or, when the number of bits of the DCI is less than a full byte, the base station implements the whole byte by adding a padding bit at the end of the DCI.
  • the DCI carried by the cooperative MAC CE is processed by the base station through a cyclic redundancy check (CRC); or the CRC is processed by the coordinated user equipment after the base station is not subjected to CRC processing;
  • CRC cyclic redundancy check
  • the CRC processing is scrambling using a Radio Network Temporary Identity (RNTI).
  • RNTI Radio Network Temporary Identity
  • the wireless network temporary identifier includes a cell radio network temporary identifier (C-RNTI) and / or semi-persistent scheduling of wireless network temporary identification (SPS-RNTI).
  • C-RNTI cell radio network temporary identifier
  • SPS-RNTI semi-persistent scheduling of wireless network temporary identification
  • the cooperative MAC header includes at least one identifier as follows:
  • a logical channel identifier configured to indicate that the content carried by the MAC CE is a DCI
  • the indication information of the DCI format is used to indicate the adopted DCI format
  • the CRC indication information is used to indicate whether CRC check information is added in the DCI.
  • the DCI format includes at least one of a DCI format of a Physical Uplink Shared Channel (PUSCH) scheduling and a DCI format of a Physical Downlink Shared Channel (PDSCH) scheduling.
  • PUSCH Physical Uplink Shared Channel
  • PDSCH Physical Downlink Shared Channel
  • An embodiment of the present invention further provides a DCI transmission method for multi-user cooperative communication, including:
  • the cooperative user equipment acquires the DCI of the base station scheduling benefit user equipment
  • the collaborative user equipment sends the DCI information to the benefit user equipment.
  • the DCI is received by the coordinated user equipment on a Physical Downlink Shared Channel (PDSCH).
  • PDSCH Physical Downlink Shared Channel
  • the cooperative user equipment sends the DCI information to the beneficial user equipment by using a physical downlink control channel (PDCCH) or an enhanced PDCCH.
  • PDCH physical downlink control channel
  • enhanced PDCCH enhanced PDCCH
  • the embodiment of the invention further provides a base station, including:
  • the first sending module is configured to send, to the coordinated user equipment, a DCI including the base station scheduling benefit user equipment.
  • the DCI adopts a backward compatible DCI format.
  • the DCI is a dynamic or semi-statically scheduled DCI.
  • the DCI is sent through a Cooperative Media Access Control Protocol Data Unit (MAC PDU) data packet.
  • MAC PDU Cooperative Media Access Control Protocol Data Unit
  • the cooperative MAC PDU data packet includes a cooperative MAC header, a cooperative MAC CE, and/or a MAC PDU of a benefit user equipment.
  • the first sending module adds a padding bit after the MAC PDU of the beneficial user equipment of the cooperative MAC PDU, so that the size of the coordinated MAC PDU data packet matches the transmission resource block.
  • the cooperative MAC PDU data packet is carried on a physical downlink shared channel (PDSCH). on.
  • PDSCH physical downlink shared channel
  • the cooperative MAC CE carries the DCI.
  • the format of the DCI carried by the cooperative MAC CE is a whole byte; or, when the number of bits of the DCI is less than a full byte, the base station implements the whole byte by adding a padding bit at the end of the DCI.
  • the DCI carried by the cooperative MAC CE is processed by a base station through a cyclic redundancy check (CRC); or, the base station performs CRC processing on the cooperative user equipment without performing CRC processing;
  • CRC cyclic redundancy check
  • the CRC processing is scrambling using a Radio Network Temporary Identity (RNTI).
  • RNTI Radio Network Temporary Identity
  • the wireless network temporary identifier includes a cell radio network temporary identifier (C-RNTI) and/or a semi-persistent scheduling radio network temporary identifier (SPS-RNTI).
  • C-RNTI cell radio network temporary identifier
  • SPS-RNTI semi-persistent scheduling radio network temporary identifier
  • the cooperative MAC header includes at least one identifier as follows:
  • a logical channel identifier configured to indicate that the content carried by the MAC CE is a DCI
  • the indication information of the DCI format is used to indicate the adopted DCI format
  • the CRC indication information is used to indicate whether CRC check information is added in the DCI.
  • the DCI format includes at least one of a DCI format of a Physical Uplink Shared Channel (PUSCH) scheduling and a DCI format of a Physical Downlink Shared Channel (PDSCH) scheduling.
  • PUSCH Physical Uplink Shared Channel
  • PDSCH Physical Downlink Shared Channel
  • the embodiment of the invention further provides a user equipment, including:
  • the second sending module is configured to send the DCI information to the benefit user equipment.
  • the DCI is received by the acquiring module on a physical downlink shared channel (PDSCH).
  • PDSCH physical downlink shared channel
  • the second sending module is configured to send the DCI information to the benefit user equipment by using a physical downlink control channel (PDCCH) or an enhanced PDCCH.
  • PDCH physical downlink control channel
  • enhanced PDCCH an enhanced PDCCH
  • Embodiments of the present invention also provide a computer readable storage medium storing computer executable instructions that, when executed, implement a DCI transmission method for multi-user cooperative communication applied to a base station.
  • the embodiment of the invention further provides a computer readable storage medium, which stores a computer executable finger
  • the DCI transmission method for multi-user cooperative communication applied to the collaborative user equipment is implemented when the computer executable instructions are executed.
  • the base station sends the DCI including the base station scheduling benefit user equipment to the coordinated user equipment, and transmits the DCI of the base station scheduling benefit user equipment by using the communication relationship between the cooperative user equipment and the benefit user equipment, thereby reducing the base station and the cooperation.
  • the signaling when the scheduling control information is directly transmitted between the user equipments achieves the purpose of reducing signaling overhead.
  • FIG. 1 is a schematic structural diagram of a MAC PDU frame used for performing a radio service between a cooperative user equipment and a benefit user equipment according to an embodiment of the present disclosure
  • FIG. 2 is a schematic structural diagram of a coordinated MAC PDU frame used by a base station and a coordinated user equipment to perform a radio service according to an embodiment of the present disclosure
  • FIG. 3 is a flowchart of a downlink control information transmission method for multi-user cooperative communication according to an embodiment of the present invention
  • FIG. 4 is a schematic structural diagram of a protocol stack used in a user cooperative communication mode according to an embodiment of the present invention.
  • FIG. 5 is a schematic diagram of a DCI adding CRC and a scrambling process according to an embodiment of the present invention
  • FIG. 6 is a schematic diagram of a wireless network architecture including a base station, a coordinated user equipment, and a benefit user equipment according to an embodiment of the present disclosure
  • FIG. 7 is a schematic flowchart of a cooperative communication according to Embodiment 1 of the present invention.
  • FIG. 8 is a structural diagram of a user equipment according to an embodiment of the present invention.
  • the embodiment of the invention provides a downlink control information transmission method for multi-user cooperative communication, which includes:
  • the base station sends downlink control information (DCI) including the base station scheduling benefit user equipment to the coordinated user equipment.
  • DCI downlink control information
  • the DCI adopts a backward compatible DCI format to ensure compatibility with existing protocols.
  • the DCI is a dynamic or semi-statically scheduled DCI.
  • the DCI is sent through a Cooperative MAC (Media Access Control) PDU (Protocol Data Unit) data packet.
  • Cooperative MAC Media Access Control
  • PDU Protocol Data Unit
  • the cooperative MAC PDU data packet includes a cooperative MAC header, a cooperative MAC CE, and/or a MAC PDU of a benefit user equipment.
  • the MAC PDU of the benefit user equipment is a MAC PDU of the benefit user equipment that has been specified in the existing protocol or a MAC PDU defined in advance for the benefit user equipment.
  • FIG. 1 is a schematic structural diagram of a MAC PDU frame used for performing a radio service between a cooperative user equipment and a benefit user equipment according to an embodiment of the present invention.
  • the cooperative user equipment uses a backward compatible air interface technology and a MAC PDU frame structure to perform message interaction with the benefit user equipment.
  • the MAC PDU refers to a media access control protocol data unit, including a media access control header (MAC header), a medium access control control unit (MAC CE), a media access control service data unit (MAC SDU), and Selected padding.
  • MAC header media access control header
  • MAC CE medium access control control unit
  • MAC SDU media access control service data unit
  • FIG. 2 is a schematic structural diagram of a coordinated MAC PDU frame used by a base station and a coordinated user equipment to perform radio service according to an embodiment of the present invention.
  • the base station uses the new air interface technology and the new MAC PDU frame structure to perform message interaction with the cooperative user equipment.
  • the cooperative MAC PDU data packet is carried on a Physical Downlink Shared Channel (PDSCH), where the coordinated MAC PDU data packet includes: a cooperative MAC PDU header, a cooperative MAC CE, and/or a MAC PDU of a benefit user equipment.
  • PDSCH Physical Downlink Shared Channel
  • the cooperative MAC PDU data packet may include: a cooperative MAC PDU header and a cooperative MAC CE; or a cooperative MAC PDU header and a MAC PDU of the benefit user equipment; or, a protocol MAC PDU header, a cooperative MAC CE, and a benefit user equipment MAC PDU.
  • the base station adds a padding bit after the MAC PDU of the benefit user equipment of the cooperative MAC PDU, so that the size of the coordinated MAC PDU data packet matches the transmission resource block.
  • the MAC PDU of the benefit user equipment is encapsulated into a cooperative MAC PDU by a cooperative MAC (ie, a newly added MAC function).
  • the cooperative MAC PDU header and the cooperative MAC CE are terminated by the coordinated user equipment, and the cooperative MAC CE is specifically referred to as a media access control control unit including a DCI.
  • the cooperative MAC PDU data packet is carried on a PDSCH (Physical Downlink Shared Channel).
  • PDSCH Physical Downlink Shared Channel
  • the cooperative MAC CE carries the DCI.
  • the format of the DCI carried by the cooperative MAC CE is a whole byte; or, when the number of bits of the DCI is less than a full byte, the base station implements the whole byte by adding a padding bit at the end of the DCI.
  • the DCI carried by the cooperative MAC CE is processed by the base station by a Cyclic Redundancy Check (CRC); or, the CRC is performed by the coordinated user equipment in the base station without CRC processing.
  • CRC Cyclic Redundancy Check
  • the CRC process is scrambled by using a Radio Network Temporary Identity (RNTI).
  • RNTI Radio Network Temporary Identity
  • the radio network temporary identifier includes a cell radio network temporary identifier (Cell RNTI, C-RNTI) and/or a semi-persistent scheduling radio network temporary identifier (Semi-Persistent Scheduling-RNTI, SPS-RNTI).
  • Cell RNTI cell radio network temporary identifier
  • SPS-RNTI semi-persistent scheduling radio network temporary identifier
  • the cooperative MAC header includes at least one identifier as follows:
  • a logical channel identifier configured to indicate that the content carried by the MAC CE is a DCI
  • the indication information of the DCI format is used to indicate the adopted DCI format
  • the CRC indication information is used to indicate whether CRC check information is added in the DCI.
  • the uncontained information may be sent through a newly defined message or by using an unused field of the existing message.
  • the DCI format includes at least one of a DCI format of a Physical Uplink Shared Channel (PUSCH) scheduling and a DCI format of a Physical Downlink Shared Channel (PDSCH) scheduling.
  • PUSCH Physical Uplink Shared Channel
  • PDSCH Physical Downlink Shared Channel
  • the cooperative MAC header includes indication information of the DCI format, for example, using 3 bits. Indicates the DCI format used, which does not consider public and multicast situations.
  • the cooperative MAC header information is shown in Figure 2.
  • the cooperative MAC header includes CRC indication information for indicating whether CRC check information is added in the DCI.
  • the content of the MAC CE (DCI) bearer in FIG. 2 is DCI information in the cooperative MAC header by using a reserved 5-bit logical channel identifier (LCID).
  • LCID logical channel identifier
  • the DCIs in Table 1 can be classified into DCI formats for uplink PUSCH scheduling according to different DCI formats, such as DCI format 0; DCI formats for downlink PDSCH scheduling, such as DCI formats 1, 1A, 1B, 1D, 2, 2A; The DCI format of the control information, such as DCI format 1A, 1C; the DCI format for scheduling multicast power control information, such as DCI format 3, 3A.
  • the DCI information is in the format of an entire byte. If less than the entire byte, padding bits are added at the end of the DCI.
  • the base station sends the DCI including the base station scheduling benefit user equipment to the coordinated user equipment, and transmits the DCI of the base station scheduling benefit user equipment by using the communication relationship between the cooperative user equipment and the benefit user equipment, thereby reducing the base station.
  • the signaling when the scheduling control information is directly transmitted between the cooperative user equipment achieves the purpose of reducing signaling overhead.
  • FIG. 3 is a flowchart of a downlink control information transmission method for multi-user cooperative communication according to an embodiment of the present invention. The method shown in Figure 3 includes:
  • Step 301 The cooperative user equipment acquires a DCI of the base station scheduling benefit user equipment.
  • Step 302 The cooperative user equipment sends the DCI information to the benefit user equipment.
  • the DCI is received by the coordinated user equipment on a Physical Downlink Shared Channel (PDSCH).
  • PDSCH Physical Downlink Shared Channel
  • the cooperative user equipment sends the DCI information to the beneficial user equipment by using a physical downlink control channel (PDCCH) or an enhanced PDCCH.
  • PDCH physical downlink control channel
  • enhanced PDCCH enhanced PDCCH
  • the coordinated user equipment forwards the DCI of the base station scheduling benefit user equipment sent by the base station, and transmits the DCI of the base station scheduling benefit user equipment by using the communication relationship between the cooperative user equipment and the benefit user equipment, thereby reducing the DCI of the base station scheduling benefit user equipment.
  • the signaling when the scheduling control information is directly transmitted between the base station and the coordinated user equipment achieves the purpose of reducing signaling overhead.
  • FIG. 4 is a schematic structural diagram of a protocol stack used in a user cooperative communication mode according to an embodiment of the present invention.
  • a MAC entity is added to the base station and the coordinated user equipment, and the benefit user equipment protocol stack structure maintains the structure of the existing user equipment protocol stack, and the generation and parsing of the cooperative MAC PDU at the base station side is implemented by the MAC entity filled by the slant line, correspondingly A MAC entity that has similar functions in the collaborative user equipment corresponds to it.
  • FIG. 5 is a schematic diagram of a DCI adding CRC and a scrambling process according to an embodiment of the present invention.
  • FIG. 6 is a schematic diagram of a base station, a cooperative user equipment, and a benefit user equipment according to an embodiment of the present invention.
  • Schematic diagram of the wireless network architecture The wireless link between the base station and the benefit user equipment is defined as the benefit user equipment link 1, the link bandwidth is relatively small, and the data rate is low; the wireless link between the base station and the cooperative user equipment is defined as the cooperative user equipment chain.
  • the link has a large bandwidth and a high data rate.
  • the wireless link between the cooperative user equipment and the user equipment is defined as the beneficial user equipment link 2.
  • FIG. 7 is a schematic diagram of a cooperative communication process according to Embodiment 1 of the present invention, in which a base station adds a CRC check information to a DCI of a benefit user equipment, and then encapsulates the information into a cooperative MAC PDU. Further, the base station sends the coordinated MAC PDU to the cooperative user. device.
  • the process of this embodiment includes the following steps:
  • Step 701 The base station encapsulates the DCI of the scheduling benefit user equipment in the cooperative MAC PDU, and sends the DCI to the cooperative user equipment.
  • the DCI is used by the base station to schedule downlink scheduling information of the benefit user equipment, and is forwarded by the coordinated user equipment to the beneficial user equipment.
  • the DCI adopts a backward compatible DCI format, that is, can be recognized by the cooperative user equipment and the benefit user equipment.
  • the DCI may be a dynamic or semi-statically scheduled DCI.
  • the DCI adds a cyclic redundancy check (CRC), which is scrambled by a Radio Network Temporary Identity (RNTI).
  • CRC cyclic redundancy check
  • RNTI Radio Network Temporary Identity
  • CRC Add Indication indicates that CRC check information is added to the DCI.
  • the RNTI includes at least a Cell Radio Network Temporary Identity (C-RNTI) and/or a Semi-persistent Scheduling Radio Network Temporary Identity (SPS-RNTI).
  • C-RNTI Cell Radio Network Temporary Identity
  • SPS-RNTI Semi-persistent Scheduling Radio Network Temporary Identity
  • the MAC entity of the base station according to the resource allocation of the physical layer and the CQI (Channel Quality Indication) of the cooperative user equipment to the benefit user equipment link 2 Feedback, selecting a suitable coded modulation mode (MCS) to ensure that the DCI scheduling information sent by the base station matches the channel quality of the benefit user equipment link 2, thereby avoiding the cooperation user equipment's division of the transport block TBs Segment processing.
  • CQI Channel Quality Indication
  • the beneficial user equipment link 2 refers to a wireless link between the cooperative user equipment and the beneficial user equipment, as shown in FIG. 6.
  • the data sent to the benefit user equipment and the DCI and the like are assembled according to the format of FIG. 2, that is, the base station adds a MAC CE control unit carrying the DCI and the corresponding MAC sub-header before the MAC PDU data packet.
  • Field information which constitutes a cooperative MAC PDU.
  • the cooperative MAC PDU is as shown in FIG. 2.
  • the base station assembles the DCI and the data service of the benefit user equipment in the cooperative MAC PDU, and sends the data to the cooperative user equipment. Therefore, the base station does not need to additionally send the scheduling control information of the benefit user equipment to the cooperative user equipment by using an (enhanced) physical downlink control channel ((e)PDCCH).
  • an (enhanced) physical downlink control channel ((e)PDCCH).
  • Step 702 The cooperative user equipment receives and parses the cooperative MAC PDU sent by the base station, acquires the DCI, and schedules the benefit user equipment.
  • the air interface technology, frequency, and bandwidth used by the coordinated user equipment and the base station are different from the air interface technology, frequency, and bandwidth between the cooperative user equipment and the beneficial user equipment.
  • the transmission rate mismatch will occur.
  • the coordinated user equipment has the capability of buffering the downlink data of the base station, and the cooperative user equipment feeds back the buffer status to the base station for flow control of the base station. .
  • the cooperative user equipment performs a separation operation of the MAC PDU and the DCI on the received cooperative MAC PDU data packet sent by the base station, and parses the DCI.
  • the DCI is scheduling information of the benefit user equipment for the base station.
  • the cooperative user equipment maps the DCI of the benefit user equipment to the (enhanced) physical downlink control channel (e) PDCCH, and schedules the benefit by using the (enhanced) physical downlink control channel (e) PDCCH.
  • User equipment maps the DCI of the benefit user equipment to the (enhanced) physical downlink control channel (e) PDCCH, and schedules the benefit by using the (enhanced) physical downlink control channel (e) PDCCH.
  • the coordinated user equipment parses a Radio Network Temporary Identity (RNTI) by using CRC check information in the DCI.
  • RNTI Radio Network Temporary Identity
  • the radio network temporary identifier includes a cell radio network temporary identifier (C-RNTI) and/or a semi-persistent scheduling radio network temporary identifier (SPS-RNTI).
  • C-RNTI cell radio network temporary identifier
  • SPS-RNTI semi-persistent scheduling radio network temporary identifier
  • the cooperative user equipment determines a routing direction of the data service according to the cell radio network temporary identifier (C-RNTI), that is, which beneficial user equipment the coordinated user equipment should forward the data service to.
  • C-RNTI cell radio network temporary identifier
  • the cooperative MAC PDU may be data content that needs to be forwarded to the benefit user equipment, or may be data content of the collaborative user equipment itself.
  • Step 702a If it is the data content of the benefit user equipment, transparently forward the MAC PDU data packet to the benefit user equipment by using an air interface technology compatible with the benefit user equipment.
  • Step 702b If it is the data content of the collaborative user equipment, the direct data packet will be delivered to the upper layer of the collaborative user equipment according to the protocol procedure.
  • the MAC PDU data packet belongs to the cooperative user equipment or the benefit user equipment is distinguished by a wireless network temporary identifier (such as C-RNTI).
  • a wireless network temporary identifier such as C-RNTI
  • Step 703 The benefit user equipment performs transmission and reception of the wireless service according to the DCI scheduling indication forwarded by the coordinated user equipment.
  • the benefit user equipment receives or transmits data on the designated resource according to the (e)PDCCH scheduling indication sent by the coordinated user equipment.
  • the (e)PDCCH scheduling indication is a DCI that is forwarded by the coordinated user equipment and is scheduled by the base station to be the benefit user equipment.
  • the data received by the benefit user equipment is a MAC PDU data packet sent by the coordinated user equipment from the base station.
  • the DCI includes downlink scheduling information and uplink scheduling information for scheduling the benefit user equipment.
  • the benefit user equipment receives an uplink resource grant indication from the base station forwarded by the coordinated user equipment, the benefit user equipment sends data to the coordinated user equipment on the designated resource. Further, the cooperative user equipment assembles the data content of the benefit user equipment into an uplink cooperative MAC PDU according to a similar process, and sends the data content to the base station, and finally, is parsed by the base station.
  • the PDCCH scheduling mode is supported according to different versions of the benefit user equipment, or only the PDCCH scheduling mode is supported.
  • the collaborative user equipment adopts a corresponding scheduling manner.
  • the MAC PDU frame structure between the benefit user equipment and the cooperative user equipment follows the form of a MAC PDU supported by the benefit user equipment, and the MAC PDU frame structure is as shown in FIG. 1 .
  • the second embodiment of the present invention uses the cooperative communication flow diagram shown in FIG. 7.
  • the difference from the first embodiment is that the base station sends the coordinated MAC PDU to the cooperative user equipment, where the DCI of the beneficial user equipment encapsulated in the cooperative MAC PDU is not added.
  • the CRC check information, the cooperative user equipment will determine the routing direction of the data service through the logical channel identifier (LCID).
  • the process of this embodiment includes the following steps:
  • Step 701 The base station encapsulates the DCI of the scheduling benefit user equipment in the cooperative MAC PDU, and sends the DCI to the cooperative user equipment.
  • the base station does not add CRC check information to the DCI of the benefit user equipment.
  • whether a CRC is added in the DCI is indicated by a “CRC Add Indication” bit in the cooperative MAC PDU header. For example, bit 0 indicates that no CRC check information is added to the DCI.
  • Step 702 The cooperative user equipment receives and parses the cooperative MAC PDU sent by the base station, acquires the DCI, and schedules the benefit user equipment.
  • the cooperative user equipment performs a separation operation of the MAC PDU and the DCI on the received cooperative MAC PDU data packet sent by the base station, and parses the DCI.
  • the cooperative user equipment acquires a logical channel identifier (LCID) by parsing the MAC PDU sub-header information in the cooperative MAC PDU.
  • LCID logical channel identifier
  • the MAC PDU subheader information is shown in Figure 2.
  • Each radio bearer of the user equipment corresponds to a logical channel identifier (LCID), and the LCID is unique within the cooperative user equipment assistance group. Therefore, the cooperative user equipment can determine the routing direction of the data service by parsing the LCID. That is, which beneficial user equipment should be forwarded by the collaborative user equipment to the data service.
  • LCID logical channel identifier
  • the cooperative user equipment adds CRC check information to the DCI of the benefit user equipment, and scrambles the CRC check information with a terminal identifier (such as C-RNTI).
  • a terminal identifier such as C-RNTI
  • the benefit control user equipment is scheduled by the (enhanced) physical downlink control channel (e) PDCCH on the downlink control channel (e) PDCCH.
  • Step 703 The benefit user equipment performs transmission and reception of the wireless service according to the DCI scheduling indication forwarded by the coordinated user equipment.
  • the benefit user equipment receives or transmits data on the designated resource according to the (e)PDCCH scheduling indication sent by the coordinated user equipment.
  • An embodiment of the present invention provides a base station, including:
  • the first sending module is configured to send, to the coordinated user equipment, a DCI including the base station scheduling benefit user equipment.
  • the DCI adopts a backward compatible DCI format.
  • the DCI is a dynamic or semi-statically scheduled DCI.
  • the DCI is sent through a Cooperative Media Access Control Protocol Data Unit (MAC PDU) data packet.
  • MAC PDU Cooperative Media Access Control Protocol Data Unit
  • the cooperative MAC PDU data packet includes a cooperative MAC header, a cooperative MAC CE, and/or a MAC PDU of a benefit user equipment.
  • the first sending module adds a padding bit after the MAC PDU of the beneficial user equipment of the cooperative MAC PDU, so that the size of the coordinated MAC PDU data packet matches the transmission resource block.
  • the cooperative MAC PDU data packet is carried on a physical downlink shared channel (PDSCH).
  • PDSCH physical downlink shared channel
  • the cooperative MAC CE carries the DCI.
  • the format of the DCI carried by the cooperative MAC CE is a whole byte; or, when the number of bits of the DCI is less than a full byte, the base station implements the whole byte by adding a padding bit at the end of the DCI.
  • the DCI carried by the cooperative MAC CE is processed by a base station through a cyclic redundancy check (CRC); or, the base station performs CRC processing on the cooperative user equipment without performing CRC processing;
  • CRC cyclic redundancy check
  • the CRC processing is scrambling using a Radio Network Temporary Identity (RNTI).
  • RNTI Radio Network Temporary Identity
  • the wireless network temporary identifier includes a cell radio network temporary identifier (C-RNTI) and/or a semi-persistent scheduling radio network temporary identifier (SPS-RNTI).
  • C-RNTI cell radio network temporary identifier
  • SPS-RNTI semi-persistent scheduling radio network temporary identifier
  • the cooperative MAC header includes at least one identifier as follows:
  • a logical channel identifier configured to indicate that the content carried by the MAC CE is a DCI
  • the indication information of the DCI format is used to indicate the adopted DCI format
  • the CRC indication information is used to indicate whether CRC check information is added in the DCI.
  • the DCI format includes at least one of a DCI format of a Physical Uplink Shared Channel (PUSCH) scheduling and a DCI format of a Physical Downlink Shared Channel (PDSCH) scheduling.
  • PUSCH Physical Uplink Shared Channel
  • PDSCH Physical Downlink Shared Channel
  • the base station sends the DCI including the base station scheduling benefit user equipment to the cooperative user equipment, and transmits the DCI of the base station scheduling benefit user equipment by using the communication relationship between the cooperative user equipment and the benefit user equipment, thereby reducing the base station.
  • the signaling when the scheduling control information is directly transmitted between the cooperative user equipment achieves the purpose of reducing signaling overhead.
  • FIG. 8 is a structural diagram of a user equipment according to an embodiment of the present invention. As shown in FIG. 8, the user equipment includes:
  • the obtaining module 801 is configured to acquire a DCI of the base station scheduling benefit user equipment
  • the second sending module 802 is configured to send the DCI information to the benefit user equipment.
  • the DCI is received by the acquiring module 801 on a physical downlink shared channel (PDSCH).
  • PDSCH physical downlink shared channel
  • the second sending module 802 is configured to send the DCI information to the benefit user equipment by using a physical downlink control channel (PDCCH) or an enhanced PDCCH.
  • PDCH physical downlink control channel
  • enhanced PDCCH an enhanced PDCCH
  • the coordinated user equipment forwards the DCI of the base station scheduling benefit user equipment sent by the base station, and transmits the DCI of the base station scheduling benefit user equipment by using the communication relationship between the cooperative user equipment and the benefit user equipment.
  • the signaling when the scheduling control information is directly transmitted between the base station and the coordinated user equipment achieves the purpose of reducing signaling overhead.
  • Embodiments of the present invention also provide a computer readable storage medium storing computer executable instructions that, when executed, implement a DCI transmission method for multi-user cooperative communication applied to a base station.
  • Embodiments of the present invention also provide a computer readable storage medium storing computer executable instructions that, when executed, implement a DCI transmission method for multi-user cooperative communication of a collaborative user equipment.
  • all or part of the steps of the above embodiments may also be implemented by using an integrated circuit. These steps may be separately fabricated into individual integrated circuit modules, or multiple modules or steps may be fabricated into a single integrated circuit module. achieve. Thus, embodiments of the invention are not limited to any specific combination of hardware and software.
  • the devices/function modules/functional units in the above embodiments may be implemented by a general-purpose computing device, which may be centralized on a single computing device or distributed over a network of multiple computing devices.
  • each device/function module/functional unit in the above embodiment When each device/function module/functional unit in the above embodiment is implemented in the form of a software function module and sold or used as a stand-alone product, it can be stored in a computer readable storage medium.
  • the above mentioned computer readable storage medium may be a read only memory, a magnetic disk or an optical disk or the like.
  • the embodiment of the present application provides a downlink control information transmission method, a base station, and a user equipment for multi-user cooperative communication, and transmits a DCI of a base station scheduling benefit user equipment by using a communication relationship between the cooperative user equipment and the benefit user equipment, and reduces the base station.
  • the signaling when the scheduling control information is directly transmitted between the cooperative user equipment achieves the purpose of reducing signaling overhead.

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Abstract

一种多用户协作通信的下行控制信息传输方法，包括：基站向协作用户设备发送包含基站调度受益用户设备的下行控制信息DCI。另一方法，包括：协作用户设备获取所述基站调度受益用户设备的下行控制信息DCI；所述协作用户设备将所述DCI信息发送给所述受益用户设备。

Description

多用户协作通信的下行控制信息传输方法、基站和用户设备 技术领域
本申请涉及但不限于移动通信领域，尤其涉及一种多用户协作通信的下行控制信息传输方法、基站和用户设备。
背景技术
在无线蜂窝通信系统中，基站(eNB或Base Station)是为用户设备(User Equipment，UE，也可称为终端terminal)提供无线接入的设备，基站与用户设备之间通过电磁波进行无线通信。多用户协作通信(Multiple User Cooperative Communication，MUCC)是一种在LTE(长期演进)系统中通过多个用户设备(User Equipment，UE)协作达到提升某个UE吞吐量的一个技术。协作的两个UE，一个叫做协作用户设备(Cooperate User Equipment，C-UE)，另一个叫做受益用户设备(Benefit User Equipment，B-UE)。协作用户设备作为基站与受益用户设备之间的数据中转者，后向兼容受益用户设备的空中接口技术，转发基站与受益用户设备之间的无线业务。
在多用户协作网络中，基站不直接与受益用户设备进行无线业务，而是通过协作用户设备的中继转发实现，多用户协作通信将由传统的基站与用户设备之间的单跳通信转变成有协作用户设备参与的两跳或多跳通信。因此，多用户协作通信中，调度受益用户设备有三种方式：第一种是，基站统一调度，由基站独立调度受益用户设备和协作用户设备；第二种是，基站独立调度协作用户设备，协作用户设备独立调度受益用户设备；第三种是，协作用户设备协助基站向受益用户设备转发调度控制信息。针对第三种方式，基站不能直接向受益用户设备发送调度控制信息，需要协作用户设备协助基站向受益用户设备转发调度控制信息的情况，为减少基站与协作用户设备之间的调度信令开销，需要对调度控制信令的传输方式进行优化。
发明内容
以下是对本文详细描述的主题的概述。本概述并非是为了限制权利要求 的保护范围。
本发明实施例提供一种多用户协作通信的下行控制信息传输方法、基站和用户设备，能够克服基站与协作用户设备之间直接传输调度控制信息时信令的开销过大的问题。
本发明实施例提供一种多用户协作通信的下行控制信息(DCI)传输方法，包括：
基站向协作用户设备发送包含基站调度受益用户设备的DCI。
其中，所述DCI采用后向兼容的DCI格式。
其中，所述DCI为动态或半静态调度的DCI。
其中，所述DCI是通过协作媒体接入控制协议数据单元(MAC PDU)数据包发送的。
其中，所述协作MAC PDU数据包包括协作MAC头、协作MAC CE和/或受益用户设备的MAC PDU。
其中，所述基站通过在所述协作MAC PDU的受益用户设备的MAC PDU之后增加填充比特，使得所述协作MAC PDU数据包的大小与传输资源块匹配。
其中，所述协作MAC PDU数据包承载在物理下行共享信道(PDSCH)上。
其中，所述协作MAC CE承载所述DCI。
其中，所述协作MAC CE承载的DCI的格式为整字节；或者，在DCI的比特数量不足整字节时，所述基站通过在DCI末尾添加填充比特以实现整字节。
其中，所述协作MAC CE承载的DCI是在所述基站经过循环冗余校验(CRC)处理的；或者，在所述基站未经过CRC处理而在所述协作用户设备进行CRC处理的；
其中，所述CRC处理是利用无线网络临时标识(RNTI)加扰。
其中，所述无线网络临时标识包括小区无线网络临时标识(C-RNTI)和 /或半持续调度无线网络临时标识(SPS-RNTI)。
其中，所述协作MAC头中包含如下至少一个标识：
逻辑信道标识，用于指示所述MAC CE承载的内容为DCI；
DCI格式的指示信息，用于指示所采用的DCI格式；
CRC指示信息，用于指示在所述DCI中是否添加了CRC校验信息。
其中，所述DCI格式包括如下至少一种：物理上行共享信道(PUSCH)调度的DCI格式和物理下行共享信道(PDSCH)调度的DCI格式中的一种。
本发明实施例还提供一种多用户协作通信的DCI传输方法，包括：
协作用户设备获取基站调度受益用户设备的DCI；
所述协作用户设备将所述DCI信息发送给所述受益用户设备。
其中，所述DCI是所述协作用户设备在物理下行共享信道(PDSCH)上接收的。
其中，所述协作用户设备通过物理下行控制信道(PDCCH)或增强的PDCCH将所述DCI信息发送给所述受益用户设备。
本发明实施例还提供一种基站，包括：
第一发送模块，设置为向协作用户设备发送包含基站调度受益用户设备的DCI。
其中，所述DCI采用后向兼容的DCI格式。
其中，所述DCI为动态或半静态调度的DCI。
其中，所述DCI是通过协作媒体接入控制协议数据单元(MAC PDU)数据包发送的。
其中，所述协作MAC PDU数据包包括协作MAC头、协作MAC CE和/或受益用户设备的MAC PDU。
其中，所述第一发送模块通过在所述协作MAC PDU的受益用户设备的MAC PDU之后增加填充比特，使得所述协作MAC PDU数据包的大小与传输资源块匹配。
其中，所述协作MAC PDU数据包承载在物理下行共享信道(PDSCH) 上。
其中，所述协作MAC CE承载所述DCI。
其中，所述协作MAC CE承载的DCI的格式为整字节；或者，在DCI的比特数量不足整字节时，所述基站通过在DCI末尾添加填充比特以实现整字节。
其中所述协作MAC CE承载的DCI是在基站经过循环冗余校验(CRC)处理的；或者，在基站未经过CRC处理而在协作用户设备进行CRC处理的；
其中，所述CRC处理是利用无线网络临时标识(RNTI)加扰。
其中，所述无线网络临时标识包括小区无线网络临时标识(C-RNTI)和/或半持续调度无线网络临时标识(SPS-RNTI)。
其中，所述协作MAC头中包含如下至少一个标识：
逻辑信道标识，用于指示所述MAC CE承载的内容为DCI；
DCI格式的指示信息，用于指示所采用的DCI格式；
CRC指示信息，用于指示在所述DCI中是否添加了CRC校验信息。
其中，所述DCI格式包括如下至少一种：物理上行共享信道(PUSCH)调度的DCI格式和物理下行共享信道(PDSCH)调度的DCI格式中的一种。
本发明实施例还提供一种用户设备，包括：
获取模块，设置为获取基站调度受益用户设备的DCI；
第二发送模块，设置为将所述DCI信息发送给所述受益用户设备。
其中，所述DCI是所述获取模块在物理下行共享信道(PDSCH)上接收的。
其中，所述第二发送模块设置为通过物理下行控制信道(PDCCH)或增强的PDCCH将所述DCI信息发送给所述受益用户设备。
本发明实施例还提供一种计算机可读存储介质，存储有计算机可执行指令，所述计算机可执行指令被执行时实现应用于基站的多用户协作通信的DCI传输方法。
本发明实施例还提供一种计算机可读存储介质，存储有计算机可执行指 令，所述计算机可执行指令被执行时实现应用于协作用户设备的多用户协作通信的DCI传输方法。
本发明实施例中，基站向协作用户设备发送包含基站调度受益用户设备的DCI，借助协作用户设备与受益用户设备之间的通信关系，来传输基站调度受益用户设备的DCI，减少了基站与协作用户设备之间直接传输调度控制信息时的信令，达到了减少信令开销的目的。
在阅读并理解了附图和详细描述后，可以明白其他方面。
附图概述
图1为本发明实施例提供的协作用户设备与受益用户设备之间进行无线业务所采用的MAC PDU帧结构示意图；
图2为本发明实施例提供的基站与协作用户设备之间进行无线业务所采用的协作MAC PDU帧结构示意图；
图3为本发明实施例提供的多用户协作通信的下行控制信息传输方法的流程图；
图4为本发明实施例提供的用户协作通信模式下采用的协议栈结构示意图；
图5为本发明实施例提供的DCI添加CRC以及加扰过程示意图；
图6为本发明实施例提供的包括基站、协作用户设备和受益用户设备的无线网络架构示意图；
图7为本发明实施例一提供的协作通信流程示意图；
图8为本发明实施例提供的用户设备的结构图。
本发明的实施方式
下面将结合附图及具体实施例对本申请作进一步的详细描述。需要说明的是，在不冲突的情况下，本申请中的实施例及实施例中的特征可以相互任意组合。
本发明实施例提供一种多用户协作通信的下行控制信息传输方法，包括：
基站向协作用户设备发送包含基站调度受益用户设备的下行控制信息(DCI)。
其中，所述DCI采用后向兼容的DCI格式，以保证与已有协议的兼容性。
其中，所述DCI为动态或半静态调度的DCI。
其中，所述DCI是通过协作MAC(Media Access Control，媒体接入控制)PDU(Protocol Data Unit，协议数据单元)数据包发送的。
其中，所述协作MAC PDU数据包包括协作MAC头、协作MAC CE和/或受益用户设备的MAC PDU。
其中，受益用户设备的MAC PDU为已有协议中已规定的受益用户设备的MAC PDU或者预先为受益用户设备定义的MAC PDU。
图1为本发明实施例提供的协作用户设备与受益用户设备之间进行无线业务所采用的MAC PDU帧结构示意图。协作用户设备采用后向兼容的空口技术以及MAC PDU帧结构与受益用户设备进行消息交互。其中，所述MAC PDU指媒体接入控制协议数据单元，包括媒体接入控制头(MAC header)、媒体接入控制控制单元(MAC CE)、媒体接入控制服务数据单元(MAC SDU)以及可选的填充比特(padding)。
图2为本发明实施例提供的基站与协作用户设备之间进行无线业务所采用的协作MAC PDU帧结构示意图。基站采用新的空口技术和新的MAC PDU帧结构与协作用户设备进行消息交互。其中，所述协作MAC PDU数据包承载在物理下行共享信道(PDSCH)上，所述协作MAC PDU数据包包含：协作MAC PDU头、协作MAC CE和/或受益用户设备的MAC PDU。即，所述协作MAC PDU数据包可以包含：协作MAC PDU头以及协作MAC CE；或者，协作MAC PDU头以及受益用户设备的MAC PDU；或者，协议MAC PDU头、协作MAC CE以及受益用户设备的MAC PDU。
其中，所述基站通过在所述协作MAC PDU的受益用户设备的MAC PDU之后增加填充比特，使得所述协作MAC PDU数据包的大小与传输资源块匹配。
其中，通过协作MAC(即新增的MAC功能)将受益用户设备的MAC PDU封装成协作MAC PDU。
其中，所述协作MAC PDU头以及所述协作MAC CE终止于所述协作用户设备，所述协作MAC CE特指包括DCI的媒体接入控制控制单元。
其中，所述协作MAC PDU数据包承载在PDSCH(Physical Downlink Shared Channel，物理下行共享信道)上。
其中，所述协作MAC CE承载所述DCI。
其中，所述协作MAC CE承载的DCI的格式为整字节；或者，在DCI的比特数量不足整字节时，所述基站通过在DCI末尾添加填充比特以实现整字节。
其中，所述协作MAC CE承载的DCI是在所述基站经过循环冗余校验(CRC，Cyclic Redundancy Check)处理的；或者，在所述基站未经过CRC处理而在所述协作用户设备进行CRC处理的；
其中，所述CRC处理是利用无线网络临时标识(RNTI，Radio Network Temporary Identity)加扰。
其中，所述无线网络临时标识包括小区无线网络临时标识(Cell RNTI，C-RNTI)和/或半持续调度无线网络临时标识(Semi-Persistent Scheduling-RNTI，SPS-RNTI)。
其中，所述协作MAC头中包含如下至少一个标识：
逻辑信道标识，用于指示所述MAC CE承载的内容为DCI；
DCI格式的指示信息，用于指示所采用的DCI格式；
CRC指示信息，用于指示在所述DCI中是否添加了CRC校验信息。
需要说明的是，当协作MAC头未包含上述全部信息，未包含的信息可以通过新定义的消息发送或利用已有消息的未使用的字段来发送。
其中，所述DCI格式包括如下至少一种：物理上行共享信道(PUSCH)调度的DCI格式和物理下行共享信道(PDSCH)调度的DCI格式中的一种。
其中，所述协作MAC头中包含所述DCI格式的指示信息，比如，用3bit 指示所采用的DCI格式，所述DCI暂不考虑公共和组播的情况。协作MAC头信息如图2所示。
其中，所述协作MAC头中包含CRC指示信息，用于指示在所述DCI中是否添加了CRC校验信息。
其中，在所述协作MAC头中用预留的5比特逻辑信道标识(LCID)指示图2中所述MAC CE(DCI)承载的内容为DCI信息。下行共享信道中LCID索引表示的具体含义如表1所述。
表1
Figure PCTCN2016095341-appb-000001
表1所述DCI，根据不同的DCI格式可以分为上行PUSCH调度的DCI格式，如DCI格式0；下行PDSCH调度的DCI格式，如DCI格式1、1A、1B、1D、2、2A；调度公共控制信息的DCI格式，如DCI格式1A、1C；调度组播的功率控制信息的DCI格式，如DCI格式3、3A。
其中，DCI信息采用整字节的格式，若不足整字节，在DCI末尾添加padding比特。
本发明实施例提供的方法，基站向协作用户设备发送包含基站调度受益用户设备的DCI，借助协作用户设备与受益用户设备之间的通信关系，来传输基站调度受益用户设备的DCI，减少了基站与协作用户设备之间直接传输调度控制信息时的信令，达到了减少信令开销的目的。
图3为本发明实施例提供的多用户协作通信的下行控制信息传输方法的流程图。图3所示方法，包括：
步骤301、协作用户设备获取基站调度受益用户设备的DCI；
步骤302、所述协作用户设备将所述DCI信息发送给所述受益用户设备。
其中，所述DCI是所述协作用户设备在物理下行共享信道(PDSCH)上接收的。
其中，所述协作用户设备通过物理下行控制信道(PDCCH)或增强的PDCCH将所述DCI信息发送给所述受益用户设备。
本发明实施例提供的方法，协作用户设备转发基站发送的包含基站调度受益用户设备的DCI，借助协作用户设备与受益用户设备之间的通信关系，来传输基站调度受益用户设备的DCI，减少了基站与协作用户设备之间直接传输调度控制信息时的信令，达到了减少信令开销的目的。
下面对本发明实施例提供的方法实施例进行说明：
图4为本发明实施例提供的用户协作通信模式下采用的协议栈结构示意图。在基站和协作用户设备增加了一个MAC实体，受益用户设备协议栈结构维持已有用户设备协议栈结构不变，在基站侧协作MAC PDU的生成与解析由斜线填充的MAC实体实现，相应的，在协作用户设备也有类似功能的MAC实体与之对应。
相关技术中的进行CRC处理的实现方式可以对DCI信息进行处理，此处不再赘述。图5为本发明实施例提供的DCI添加CRC以及加扰过程示意图。
图6为本发明实施例提供的包括基站、协作用户设备和受益用户设备的 无线网络架构示意图。基站与受益用户设备之间的无线链路定义为受益用户设备链路1，该链路带宽相对较小，数据速率较低；基站与协作用户设备之间的无线链路定义为协作用户设备链路，该链路带宽较大，数据速率较高；协作用户设备与受益用户设备之间的无线链路定义为受益用户设备链路2，由于受协作用户设备服务的受益用户设备数量不多，并且协作用户设备与受益用户设备之间的距离较近，链路质量好等，因此受益用户设备链路2的数据速率高于受益用户设备链路1。本申请仅考虑基于协作用户设备协助通信的场景，暂不讨论受益用户设备链路1的无线通信。
实施例一
图7为本发明实施例一提供的协作通信流程示意图，其中，基站对受益用户设备的DCI添加了CRC校验信息后封装到协作MAC PDU中，进一步的，基站将协作MAC PDU发送到协作用户设备。本实施例的流程包括以下步骤：
步骤701：基站将调度受益用户设备的DCI封装在协作MAC PDU中，并发送给协作用户设备。
其中，所述DCI是指所述基站调度所述受益用户设备的下行调度信息，并由所述协作用户设备转发到所述受益用户设备。
其中，所述DCI采用后向兼容的DCI格式，即能被协作用户设备以及受益用户设备所识别。
其中，所述DCI可以是动态或半静态调度的DCI。
其中，所述DCI添加了循环冗余校验(CRC)，所述CRC由无线网络临时标识(RNTI)加扰。
其中，所述DCI中是否添加了CRC通过所述协作MAC PDU头中的“CRC添加指示”比特指示。比如，比特1表示所述DCI中添加了CRC校验信息。
其中，所述RNTI至少包括小区无线网络临时标识(C-RNTI)和/或半持续调度无线网络临时标识(SPS-RNTI)。
所述基站的MAC实体根据物理层的资源分配情况以及所述协作用户设备对受益用户设备链路2的CQI(Channel Quality Indication，信道质量指示) 反馈，选择合适的编码调制方式(MCS)，以确保所述基站发送的所述DCI调度信息匹配受益用户设备链路2的信道质量，进而，避免了所述协作用户设备对传输块TBs的分段处理。
其中，所述受益用户设备链路2是指所述协作用户设备与所述受益用户设备之间的无线链路，如图6所示。
其中，对发往所述受益用户设备的数据以及DCI等内容按照图2的格式进行组装，即所述基站在所述MAC PDU数据包前增加承载DCI的MAC CE控制单元以及对应的MAC子头字段信息，组成协作MAC PDU。所述协作MAC PDU如图2所示。
所述基站将所述受益用户设备的DCI与数据业务组装在协作MAC PDU中，一并发送给所述协作用户设备。因此，所述基站不需要额外通过(增强)物理下行控制信道((e)PDCCH)发送所述受益用户设备的调度控制信息到所述协作用户设备。
步骤702：协作用户设备接收、解析基站发送的协作MAC PDU，获取DCI，并调度受益用户设备。
受所述协作用户设备与所述基站之间所使用的空口技术、频点和带宽不同于所述协作用户设备与所述受益用户设备之间采用空口技术、频点和带宽等因素的影响，将出现传输速率不匹配的情况，基于此，所述协作用户设备具有缓存所述基站下行数据的能力，并且所述协作用户设备将缓存状态反馈给所述基站，用于所述基站的流控。
所述协作用户设备对接收到的所述基站发送的协作MAC PDU数据包进行MAC PDU和DCI的分离操作，解析出所述DCI。
其中，所述DCI为所述基站调度所述受益用户设备的调度信息。
其中，所述协作用户设备将所述受益用户设备的DCI映射到所述(增强)物理下行控制信道(e)PDCCH上，通过所述(增强)物理下行控制信道(e)PDCCH调度所述受益用户设备。
可选地，所述协作用户设备通过所述DCI中的CRC校验信息解析出无线网络临时标识(RNTI)。
其中，所述无线网络临时标识(RNTI)包括小区无线网络临时标识(C-RNTI)和/或半持续调度无线网络临时标识(SPS-RNTI)。
其中，所述协作用户设备根据小区无线网络临时标识(C-RNTI)确定数据业务的路由方向，即所述协作用户设备应该将数据业务转发到哪个受益用户设备。
其中，所述协作MAC PDU可能是需要转发到所述受益用户设备的数据内容，也可能是所述协作用户设备自身的数据内容。
步骤702a：如果是所述受益用户设备的数据内容，通过后向兼容所述受益用户设备的空口技术将所述MAC PDU数据包透传转发到所述受益用户设备。
步骤702b：如果是所述协作用户设备的数据内容，将按照协议过程直接数据包递交到所述协作用户设备的高层。
所述MAC PDU数据包属于协作用户设备或受益用户设备通过无线网络临时标识(如C-RNTI)进行区分。
步骤703：受益用户设备按照协作用户设备转发的DCI调度指示进行无线业务的收发。
所述受益用户设备根据所述协作用户设备发送的(e)PDCCH调度指示，在指定的资源上接收或发送数据。
其中，所述(e)PDCCH调度指示，是所述协作用户设备转发的由所述基站调度所述受益用户设备的DCI。
其中，所述受益用户设备接收到的数据为所述协作用户设备转发的来自所述基站的MAC PDU数据包。
所述DCI包括调度受益用户设备的下行调度信息和上行调度信息。
其中，如果所述受益用户设备接收到的是所述协作用户设备转发的来自所述基站的上行资源授权指示，所述受益用户设备将在指定的资源上发送数据到所述协作用户设备。进一步的，所述协作用户设备按照类似的过程将所述受益用户设备的数据内容组装成上行协作MAC PDU，发送给所述基站，最终，由所述基站进行解析。
其中，根据所述受益用户设备的不同版本，或者仅支持PDCCH调度方式，或者支持PDCCH/ePDCCH调度方式。相应的，所述协作用户设备采用对应的调度方式。
所述受益用户设备与所述协作用户设备之间的MAC PDU帧结构遵循受益用户设备支持的MAC PDU形式，所述MAC PDU帧结构如图1所示。
实施例二
本发明实施例二采用图7所示的协作通信流程示意图，与实施例一不同的是，基站发送协作MAC PDU到协作用户设备，其中，封装在协作MAC PDU中的受益用户设备的DCI未添加CRC校验信息，协作用户设备将通过逻辑信道标识(LCID)确定数据业务的路由方向。本实施例的流程包括以下步骤：
步骤701：基站将调度受益用户设备的DCI封装在协作MAC PDU中，并发送给协作用户设备。
其中，所述基站对所述受益用户设备的DCI未添加CRC校验信息。
其中，所述DCI中是否添加了CRC通过所述协作MAC PDU头中的“CRC添加指示”比特指示。比如，比特0表示所述DCI中未添加CRC校验信息。
步骤702：协作用户设备接收、解析基站发送的协作MAC PDU，获取DCI，并调度受益用户设备。
所述协作用户设备对接收到的所述基站发送的协作MAC PDU数据包进行MAC PDU和DCI的分离操作，解析出所述DCI。
其中，所述协作用户设备通过对协作MAC PDU中MAC PDU子头信息的解析，获取逻辑信道标识(LCID)。MAC PDU子头信息如图2所示。
其中，用户设备的每个无线承载对应一个逻辑信道标识(LCID)，LCID在所述协作用户设备协助组内是唯一的，因此，协作用户设备通过对LCID的解析，可以确定数据业务的路由方向，即所述协作用户设备应该将数据业务转发到哪个受益用户设备。
所述协作用户设备对受益用户设备的DCI添加CRC校验信息，并用终端标识(比如C-RNTI)对CRC校验信息进行加扰。
所述协作用户设备将所述受益用户设备的DCI映射到所述(增强)物理 下行控制信道(e)PDCCH上，通过所述(增强)物理下行控制信道(e)PDCCH调度所述受益用户设备。
步骤703：受益用户设备按照协作用户设备转发的DCI调度指示进行无线业务的收发。
所述受益用户设备根据所述协作用户设备发送的(e)PDCCH调度指示，在指定的资源上接收或发送数据。
本发明实施例提供一种基站，包括：
第一发送模块，设置为向协作用户设备发送包含基站调度受益用户设备的DCI。
其中，所述DCI采用后向兼容的DCI格式。
其中，所述DCI为动态或半静态调度的DCI。
其中，所述DCI是通过协作媒体接入控制协议数据单元(MAC PDU)数据包发送的。
其中，所述协作MAC PDU数据包包括协作MAC头、协作MAC CE和/或受益用户设备的MAC PDU。
其中，所述第一发送模块通过在所述协作MAC PDU的受益用户设备的MAC PDU之后增加填充比特，使得所述协作MAC PDU数据包的大小与传输资源块匹配。
其中，所述协作MAC PDU数据包承载在物理下行共享信道(PDSCH)上。
其中，所述协作MAC CE承载所述DCI。
其中，所述协作MAC CE承载的DCI的格式为整字节；或者，在DCI的比特数量不足整字节时，所述基站通过在DCI末尾添加填充比特以实现整字节。
其中所述协作MAC CE承载的DCI是在基站经过循环冗余校验(CRC)处理的；或者，在基站未经过CRC处理而在协作用户设备进行CRC处理的；
其中，所述CRC处理是利用无线网络临时标识(RNTI)加扰。
其中，所述无线网络临时标识包括小区无线网络临时标识(C-RNTI)和/或半持续调度无线网络临时标识(SPS-RNTI)。
其中，所述协作MAC头中包含如下至少一个标识：
逻辑信道标识，用于指示所述MAC CE承载的内容为DCI；
DCI格式的指示信息，用于指示所采用的DCI格式；
CRC指示信息，用于指示在所述DCI中是否添加了CRC校验信息。
其中，所述DCI格式包括如下至少一种：物理上行共享信道(PUSCH)调度的DCI格式和物理下行共享信道(PDSCH)调度的DCI格式中的一种。
本发明实施例提供的基站，基站向协作用户设备发送包含基站调度受益用户设备的DCI，借助协作用户设备与受益用户设备之间的通信关系，来传输基站调度受益用户设备的DCI，减少了基站与协作用户设备之间直接传输调度控制信息时的信令，达到了减少信令开销的目的。
图8为本发明实施例提供的用户设备的结构图。如图8所示，用户设备包括：
获取模块801，设置为获取基站调度受益用户设备的DCI；
第二发送模块802，设置为将所述DCI信息发送给所述受益用户设备。
其中，所述DCI是所述获取模块801在物理下行共享信道(PDSCH)上接收的。
其中，所述第二发送模块802设置为通过物理下行控制信道(PDCCH)或增强的PDCCH将所述DCI信息发送给所述受益用户设备。
本发明实施例提供的用户设备，协作用户设备转发基站发送的包含基站调度受益用户设备的DCI，借助协作用户设备与受益用户设备之间的通信关系，来传输基站调度受益用户设备的DCI，减少了基站与协作用户设备之间直接传输调度控制信息时的信令，达到了减少信令开销的目的。
本发明实施例还提供一种计算机可读存储介质，存储有计算机可执行指令，所述计算机可执行指令被执行时实现应用于基站的多用户协作通信的DCI传输方法。
本发明实施例还提供一种计算机可读存储介质，存储有计算机可执行指令，所述计算机可执行指令被执行时实现应用于协作用户设备的多用户协作通信的DCI传输方法。
本领域普通技术人员可以理解上述实施例的全部或部分步骤可以使用计算机程序流程来实现，所述计算机程序可以存储于一计算机可读存储介质中，所述计算机程序在相应的硬件平台上(如系统、设备、装置、器件等)执行，在执行时，包括方法实施例的步骤之一或其组合。
可选地，上述实施例的全部或部分步骤也可以使用集成电路来实现，这些步骤可以被分别制作成一个个集成电路模块，或者将它们中的多个模块或步骤制作成单个集成电路模块来实现。这样，本发明实施例不限制于任何特定的硬件和软件结合。
上述实施例中的各装置/功能模块/功能单元可以采用通用的计算装置来实现，它们可以集中在单个的计算装置上，也可以分布在多个计算装置所组成的网络上。
上述实施例中的各装置/功能模块/功能单元以软件功能模块的形式实现并作为独立的产品销售或使用时，可以存储在一个计算机可读取存储介质中。上述提到的计算机可读取存储介质可以是只读存储器，磁盘或光盘等。
以上所述，仅为本申请的具体实施方式，但本申请的保护范围并不局限于此，任何熟悉本技术领域的技术人员在本申请揭露的技术范围内，可轻易想到变化或替换，都应涵盖在本申请的保护范围之内。因此，本申请的保护范围应以权利要求所述的保护范围为准。
工业实用性
本申请实施例提供一种多用户协作通信的下行控制信息传输方法、基站和用户设备，借助协作用户设备与受益用户设备之间的通信关系，来传输基站调度受益用户设备的DCI，减少了基站与协作用户设备之间直接传输调度控制信息时的信令，达到了减少信令开销的目的。

Claims (32)

  1. 一种多用户协作通信的下行控制信息DCI传输方法，包括：
    基站向协作用户设备发送包含基站调度受益用户设备的下行控制信息DCI。
  2. 根据权利要求1所述的方法，其中，所述DCI采用后向兼容的DCI格式。
  3. 根据权利要求1所述的方法，其中，所述DCI为动态或半静态调度的DCI。
  4. 根据权利要求1所述的方法，其中，所述DCI是通过协作媒体接入控制协议数据单元MAC PDU数据包发送的。
  5. 根据权利要求4所述的方法，其中，所述协作MAC PDU数据包包括协作MAC头、协作MAC CE和/或受益用户设备的MAC PDU。
  6. 根据权利要求5所述的方法，其中，所述基站通过在所述协作MAC PDU的受益用户设备的MAC PDU之后增加填充比特，使得所述协作MAC PDU数据包的大小与传输资源块匹配。
  7. 根据权利要求4至6任一所述的方法，其中，所述协作MAC PDU数据包承载在物理下行共享信道PDSCH上。
  8. 根据权利要求5所述的方法，其中，所述协作MAC CE承载所述DCI。
  9. 根据权利要求8所述的方法，其中，所述协作MAC CE承载的DCI的格式为整字节；或者，在DCI的比特数量不足整字节时，所述基站通过在DCI末尾添加填充比特以实现整字节。
  10. 根据权利要求8所述的方法，其中，所述协作MAC CE承载的DCI是在所述基站经过循环冗余校验CRC处理的；或者，在所述基站未经过CRC处理而在所述协作用户设备进行CRC处理的；
    其中，所述CRC处理是利用无线网络临时标识RNTI加扰。
  11. 根据权利要求10所述的方法，其中，所述无线网络临时标识包括小区无线网络临时标识C-RNTI和/或半持续调度无线网络临时标识 SPS-RNTI。
  12. 根据权利要求5所述的方法，其中，所述协作MAC头中包含如下至少一个标识：
    逻辑信道标识，用于指示所述MAC CE承载的内容为DCI；
    DCI格式的指示信息，用于指示所采用的DCI格式；
    循环冗余校验CRC指示信息，用于指示在所述DCI中是否添加了CRC校验信息。
  13. 根据权利要求12所述的方法，其中，所述DCI格式包括如下至少一种：物理上行共享信道PUSCH调度的DCI格式和物理下行共享信道PDSCH调度的DCI格式中的一种。
  14. 一种多用户协作通信的下行控制信息DCI传输方法，包括：
    协作用户设备获取基站调度受益用户设备的下行控制信息DCI；
    所述协作用户设备将所述DCI信息发送给所述受益用户设备。
  15. 根据权利要求14所述的方法，其中，所述DCI是所述协作用户设备在物理下行共享信道PDSCH上接收的。
  16. 根据权利要求14或15所述的方法，其中，所述协作用户设备通过物理下行控制信道PDCCH或增强的PDCCH将所述DCI信息发送给所述受益用户设备。
  17. 一种基站，包括：
    第一发送模块，设置为向协作用户设备发送包含基站调度受益用户设备的下行控制信息DCI。
  18. 根据权利要求17所述的基站，其中，所述DCI采用后向兼容的DCI格式。
  19. 根据权利要求17所述的基站，其中，所述DCI为动态或半静态调度的DCI。
  20. 根据权利要求17所述的基站，其中，所述DCI是通过协作媒体接入控制协议数据单元MAC PDU数据包发送的。
  21. 根据权利要求20所述的基站，其中，所述协作MAC PDU数据包包括协作MAC头、协作MAC CE和/或受益用户设备的MAC PDU。
  22. 根据权利要求21所述的基站，其中，所述第一发送模块通过在所述协作MAC PDU的受益用户设备的MAC PDU之后增加填充比特，使得所述协作MAC PDU数据包的大小与传输资源块匹配。
  23. 根据权利要求20至22任一所述的基站，其中，所述协作MAC PDU数据包承载在物理下行共享信道PDSCH上。
  24. 根据权利要求21所述的基站，其中，所述协作MAC CE承载所述DCI。
  25. 根据权利要求24所述的基站，其中，所述协作MAC CE承载的DCI的格式为整字节；或者，在DCI的比特数量不足整字节时，所述基站通过在DCI末尾添加填充比特以实现整字节。
  26. 根据权利要求24所述的基站，其中，所述协作MAC CE承载的DCI是在基站经过循环冗余校验CRC处理的；或者，在基站未经过CRC处理而在协作用户设备进行CRC处理的；
    其中，所述CRC处理是利用无线网络临时标识RNTI加扰。
  27. 根据权利要求26所述的基站，其中，所述无线网络临时标识包括小区无线网络临时标识C-RNTI和/或半持续调度无线网络临时标识SPS-RNTI。
  28. 根据权利要求21所述的基站，其中，所述协作MAC头中包含如下至少一个标识：
    逻辑信道标识，用于指示所述MAC CE承载的内容为DCI；
    DCI格式的指示信息，用于指示所采用的DCI格式；
    循环冗余校验CRC指示信息，用于指示在所述DCI中是否添加了CRC校验信息。
  29. 根据权利要求28所述的基站，其中，所述DCI格式包括如下至少一种：物理上行共享信道PUSCH调度的DCI格式和物理下行共享信道PDSCH调度的DCI格式中的一种。
  30. 一种用户设备，包括：
    获取模块，设置为获取基站调度受益用户设备的下行控制信息DCI；
    第二发送模块，设置为将所述DCI信息发送给所述受益用户设备。
  31. 根据权利要求30所述的用户设备，其中，所述DCI是所述获取模块在物理下行共享信道PDSCH上接收的。
  32. 根据权利要求31或32所述的用户设备，其中，所述第二发送模块设置为通过物理下行控制信道PDCCH或增强的PDCCH将所述DCI信息发送给所述受益用户设备。
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