WO2016095119A1 - Équipement d'utilisateur, station de base, et procédé de communication d2d - Google Patents

Équipement d'utilisateur, station de base, et procédé de communication d2d Download PDF

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Publication number
WO2016095119A1
WO2016095119A1 PCT/CN2014/094041 CN2014094041W WO2016095119A1 WO 2016095119 A1 WO2016095119 A1 WO 2016095119A1 CN 2014094041 W CN2014094041 W CN 2014094041W WO 2016095119 A1 WO2016095119 A1 WO 2016095119A1
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WIPO (PCT)
Prior art keywords
information
feedback
base station
resource
sent
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PCT/CN2014/094041
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English (en)
Chinese (zh)
Inventor
黎超
张兴炜
Original Assignee
华为技术有限公司
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
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Publication date
Application filed by 华为技术有限公司 filed Critical 华为技术有限公司
Priority to CN202010019467.6A priority Critical patent/CN111200875B/zh
Priority to CN201480024261.5A priority patent/CN105917733B/zh
Priority to PCT/CN2014/094041 priority patent/WO2016095119A1/fr
Publication of WO2016095119A1 publication Critical patent/WO2016095119A1/fr

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W76/00—Connection management
    • H04W76/10—Connection setup
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W92/00—Interfaces specially adapted for wireless communication networks
    • H04W92/16—Interfaces between hierarchically similar devices
    • H04W92/18—Interfaces between hierarchically similar devices between terminal devices

Definitions

  • Embodiments of the present invention relate to the field of communications, and, more particularly, to a user equipment, a base station, and a method of D2D communication.
  • UEs user equipments
  • D2D Device to Device
  • a D2D link can be established between the UEs to directly interact or directly interact with the network.
  • the UE as the transmitter transmits in a broadcast manner, that is, the transmitter transmits only, without knowing which UE the target receiver is, and the transmitter does not pay attention to receiving.
  • the reception of the machine The UE as the receiver only receives or blindly checks on the resources agreed by the system, and cannot notify the transmitter of the reception quality regardless of whether the data received by the receiver is correct or not.
  • QoS quality of service
  • the embodiments of the present invention provide a user equipment, a base station, and a D2D communication method, which can ensure QoS of D2D communication.
  • the first aspect provides a user equipment UE, where the UE is a second UE, including:
  • a receiving unit configured to receive a transmit signal sent by the first UE, where the transmit signal is transmitted by using a D2D link between the first UE and the second UE;
  • a processing unit configured to generate first feedback information according to the transmit signal received by the receiving unit
  • a sending unit configured to send the first feedback information generated by the processing unit to the first UE.
  • the transmitting signal is a first reference signal
  • the first reference signal is used to perform quality measurement on the D2D link
  • the first feedback information includes signal quality information and/or transmit power information of the D2D link.
  • the sending unit is further configured to send the first feedback information to the The serving base station of the second UE.
  • the transmitting signal is a data packet
  • the first feedback information includes: response information after demodulating the data packet by the second UE, where the response information is a negative acknowledgement information ACK for demodulating correct or negative acknowledgement information NACK for demodulation error.
  • the data packet includes first indication information, where the first indication information is used by At least one of the following is indicated: an identification ID of the first UE, an ID of the second UE, and an ID of the D2D link.
  • the first feedback information further includes signal quality information of the D2D link / or transmit power information.
  • the processing unit is further configured to generate a second according to the demodulated result in the sixth possible implementation manner of the foregoing Feedback information, where the second feedback information includes signal quality information and/or transmit power information of the D2D link;
  • the sending unit is further configured to send the second feedback information generated by the processing unit to a serving base station of the first UE and/or the second UE.
  • the sending unit sends the second feedback information to the second UE Service base station
  • the second feedback information further includes first indication information, where the first indication information is used to indicate at least one of: an ID of the first UE, an ID of the second UE, and the D2D chain The ID of the road.
  • the receiving unit is configured to receive the transmit signal sent by the first UE prior to,
  • the receiving unit is further configured to: receive scheduling allocation SA indication information sent by the first UE, where the SA indication information includes information about a transmission resource to be used by the first UE, where the transmission resource includes the following At least one of: modulation coding mode MCS, transmission power, and time-frequency resources;
  • the receiving unit is specifically configured to: receive, according to the SA indication information, the transmit signal sent by the first UE.
  • the processing unit is further configured to generate a second reference signal according to the transmitting signal, in a ninth possible implementation manner of the foregoing Wherein the second reference signal is determined according to a predefined sequence;
  • the sending unit is further configured to send the second reference signal to the first UE.
  • the first feedback information includes a second reference signal, where the second The reference signal is determined according to a predefined sequence.
  • the signal quality information includes at least one of the following: a reference signal received power RSRP And reference signal reception quality RSRQ, received signal strength indication RSSI, channel quality indication CQI, and adjustment information of the CQI;
  • the transmission power information includes adjustment information of a value of transmission power and/or transmission power.
  • the sending unit is specifically configured to: according to the feedback resource, the first The feedback information is sent to the first UE.
  • the sending by the sending unit, sending the first feedback information to the Before a UE
  • the receiving unit is further configured to: receive configuration information sent by the serving base station of the second UE, where the configuration information includes second indication information, where the second indication information is used to indicate a location of the feedback resource .
  • the sending by the sending unit, the first feedback information is sent to the first Before a UE,
  • the receiving unit is further configured to acquire the association information, and receive the transmission resource sent by the first UE, where the association information is used to indicate an association relationship between the transmission resource and the feedback resource,
  • the association information is predefined or the association information is received from a serving base station of the second UE;
  • the processing unit is further configured to determine the feedback resource according to the association information and the transmission resource.
  • the sending by the sending unit, sending the first feedback information to the first Before a UE, the receiving unit is further configured to:
  • the feedback resource receives, by the first UE, the feedback resource, where the feedback resource is determined by the first UE according to a transmission resource and a slave association information, where the association information is used to indicate the The relationship between the feedback resources.
  • the feedback resource is autonomous from the feedback resource pool by the second UE.
  • the feedback resource pool is pre-configured or the feedback resource pool is received from a serving base station of the second UE.
  • the first UE and the second UE are located in the same cell, in the seventeenth possible implementation manner of the foregoing
  • the serving base station of the first UE and the serving base station of the second UE are the same base station.
  • the second aspect provides a user equipment UE, where the UE is a first UE, including:
  • a processing unit configured to generate a transmit signal
  • a sending unit configured to send the transmit signal generated by the processing unit to a second UE, where the transmit signal is transmitted by using a D2D link between the first UE and the second UE;
  • a receiving unit configured to receive first feedback information sent by the second UE.
  • the transmitting signal is a first reference signal
  • the first reference signal is used to perform quality measurement on the D2D link
  • the first feedback information includes signal quality information and/or transmit power information of the D2D link.
  • the transmitting signal is a data packet
  • the first feedback information includes The response information after the second UE demodulates the data packet, wherein the response information is a demodulation correct acknowledgement information ACK or a demodulation error negative acknowledgement information NACK.
  • the data packet includes first indication information, where the first indication information is used to indicate at least one of: the first An identification ID of the UE, an ID of the second UE, and an ID of the D2D link.
  • the first feedback information further includes: signal quality information of the D2D link And/or transmit power information.
  • the receiving unit is further configured to receive, by the second UE, the second Feedback information, wherein the second feedback information includes signal quality information and/or transmit power information of the D2D link.
  • the processing unit is further configured to: if the first feedback information includes an ACK, :
  • the untransmitted retransmission packet of the transmitted data packet is suspended, and the new data packet to be transmitted is sent to the second UE according to the current configuration parameter.
  • the processing unit is further used to: if the first feedback information includes an ACK, :
  • the processing unit is further configured to: :
  • the retransmission packet of the transmitted data packet is sent to the second UE according to the current configuration parameter
  • the retransmission packet of the transmitted data packet has been sent, increase the number of retransmissions of the transmitted data packet or change the retransmission pattern, and send the retransmission packet of the sent data packet to the first Two UEs.
  • the processing unit is further configured to: :
  • the processing unit is further used to: if the first feedback information includes a NACK, :
  • Subsequent data packets are sent to the second UE according to the adjusted configuration parameters.
  • the receiving unit is further configured to receive the serving base station of the first UE, in an eleventh possible implementation manner of the foregoing
  • the first configuration information that is sent where the first configuration information includes at least one of: retransmission times or retransmission pattern configuration information, transmission power or transmission power adjustment information, and modulation coding mode used by the MCS.
  • the information and the indication information of the used time-frequency resource, and the first configuration information is determined by the serving base station of the first UE according to the second feedback information sent by the second UE;
  • the processing unit is further configured to: adjust configuration parameters according to the first configuration information
  • the sending unit is further configured to send a subsequent data packet to the second UE according to the adjusted configuration parameter.
  • the first configuration information further includes, for indicating the D2D link ID information.
  • the configuration parameter includes at least one of the following: a modulation coding mode MCS level, Retransmission times, retransmission pattern information, transmission power information, and indication information of time-frequency resources.
  • the sending unit before the sending unit sends the transmitting signal to the second UE, the sending unit is further configured to:
  • the SA indication information includes information about a transmission resource to be used by the first UE, where the transmission resource includes at least one of a modulation coding mode MCS, a transmission power, and a time-frequency resource.
  • the receiving unit is further configured to receive, by the second UE, A second reference signal, wherein the second reference signal is determined according to a predefined sequence.
  • the first feedback information further includes a second reference signal, wherein the The second reference signal is determined according to a predefined sequence.
  • the signal quality information includes at least one of the following: a reference signal receiving power RSRP And reference signal reception quality RSRQ, received signal strength indication RSSI, channel quality indication CQI, and adjustment information of the CQI;
  • the transmission power information includes adjustment information of a value of transmission power and/or transmission power.
  • the sending unit is configured to: A signal is sent to the second UE.
  • the sending unit before the sending unit sends the transmitting signal to the second UE, the receiving unit is further configured to:
  • Second configuration information that is sent by the serving base station of the first UE, where the second configuration information includes second indication information, where the second indication information is used to indicate a location of the transmitting resource.
  • the transmitting resource is autonomous from the Optionally, wherein the transmit resource pool is pre-configured or the transmit resource pool is received from a serving base station of the first UE.
  • the sending unit before the sending unit sends the transmitting signal to the second UE, ,
  • the receiving unit is further configured to: acquire association information, and receive a feedback resource that is sent by the second UE, where the association information is used to indicate an association relationship between the transmission resource and the feedback resource,
  • the association information is predefined or the association information is received from a serving base station of the first UE;
  • the processing unit is further configured to determine the transmitting resource according to the association information and the feedback resource.
  • the receiving by the receiving unit, the first feedback sent by the second UE Before the message
  • the receiving unit is further configured to acquire association information, where the association information is used to indicate an association relationship between the transmitting resource and a feedback resource, where the association information is predefined or the associated information is from the Received by the serving base station of the first UE;
  • the processing unit is further configured to determine a feedback resource according to the association information and the transmission resource.
  • the receiving unit is configured to: receive, according to the feedback resource, the second thirteen possible implementation manners of the second aspect The first feedback information sent by the second UE.
  • the first UE and the second UE are located in the same cell,
  • the serving base station of the first UE and the serving base station of the second UE are the same base station.
  • a base station including:
  • a receiving unit configured to receive feedback information sent by the second user equipment UE, where the feedback information includes signal quality information and/or transmit power information of a D2D link between the first UE and the second UE;
  • a processing unit configured to generate first configuration information according to the feedback information received by the receiving unit
  • a sending unit configured to send the first configuration information generated by the processing unit to the first UE, where the base station is a serving base station of the first UE.
  • the sending unit is further configured to send the second configuration information to the first UE,
  • the second configuration information includes a transmission resource pool and/or association information for the D2D link, where the association information is used to indicate an association relationship between the transmission resource and the feedback resource.
  • the first UE and the second UE are located in a same cell, and the sending The unit is further configured to send third configuration information to the second UE, where
  • the third configuration information includes a feedback resource pool and/or association information for the D2D link, where the association information is used to indicate an association relationship between the transmission resource and the feedback resource.
  • the first UE and the second UE are located in different cells, and the receiving Unit, specifically for:
  • the first configuration information includes at least one of the following: a retransmission number or The configuration information of the retransmission pattern, the adjustment information of the transmission power or the transmission power, the information of the modulation coding mode MCS used, and the indication information of the used time-frequency resource.
  • the first configuration information further includes an identifier for indicating the D2D link ID information.
  • the feedback information further includes indication information, where the indication information is used to indicate At least one of the following: an ID of the first UE, an ID of the second UE, and an ID of the D2D link.
  • the signal quality information includes at least one of: a reference signal received power RSRP, Reference signal reception quality RSRQ, received signal strength indication RSSI, channel quality indication CQI, and adjustment information of the CQI;
  • the transmission power information includes adjustment information of a value of transmission power and/or transmission power.
  • a fourth aspect provides a base station, where the base station is a second base station, including:
  • a receiving unit configured to receive feedback information sent by the second user equipment UE, where the The feed information includes signal quality information and/or transmit power information of a D2D link between the first UE and the second UE, where the second base station is a serving base station of the second UE;
  • a sending unit configured to send the feedback information received by the receiving unit to a first base station, where the first base station is a serving base station of a first UE, and the first UE and the second UE are located in different Community.
  • the sending unit is further configured to send configuration information to the second UE,
  • the configuration information includes a feedback resource pool and/or association information for the D2D link, where the association information is used to indicate an association relationship between a transmission resource and a feedback resource.
  • the feedback information further includes indication information, where the indication information is used to indicate the following At least one of: an identification ID of the first UE, an ID of the second UE, and an ID of the D2D link.
  • the signal quality information includes at least one of: a reference signal received power RSRP, Reference signal reception quality RSRQ, received signal strength indication RSSI, channel quality indication CQI, and adjustment information of the CQI;
  • the transmission power information includes adjustment information of a value of transmission power and/or transmission power.
  • a method for device-to-device D2D communication including:
  • the second user equipment UE receives the transmission signal sent by the first UE, where the transmission signal is transmitted through a D2D link between the first UE and the second UE;
  • the second UE generates first feedback information according to the transmit signal
  • the second UE sends the first feedback information to the first UE.
  • the transmitting signal is a first reference signal
  • the first reference signal is used to perform quality measurement on the D2D link
  • the first feedback information includes signal quality information and/or transmit power information of the D2D link.
  • the method further includes:
  • the second UE sends the first feedback information to a serving base station of the second UE.
  • the transmitting signal For the data packet In a third possible implementation manner of the fifth aspect, the transmitting signal For the data packet,
  • the first feedback information includes: response information after demodulating the data packet by the second UE, where the response information is a negative acknowledgement information ACK for demodulating correct or negative acknowledgement information NACK for demodulation error.
  • the data packet includes first indication information, where the first indication information is used to indicate the following At least one of: an identification ID of the first UE, an ID of the second UE, and an ID of the D2D link.
  • the first feedback information further includes signal quality information of the D2D link / or transmit power information.
  • the sixth possible implementation manner of the fifth aspect further includes:
  • the second UE Generating, by the second UE, second feedback information according to the result of the demodulation, where the second feedback information includes signal quality information and/or transmit power information of the D2D link;
  • the second UE sends the second feedback information to a serving base station of the first UE and/or the second UE.
  • the second UE sends the second feedback information to the second The serving base station of the UE,
  • the second feedback information further includes first indication information, where the first indication information is used to indicate at least one of: an ID of the first UE, an ID of the second UE, and the D2D chain The ID of the road.
  • the eighth possible implementation manner of the foregoing aspect before the second UE receives the transmit signal sent by the first UE, :
  • the second UE receives the scheduling allocation SA indication information sent by the first UE, where the SA indication information includes information about a transmission resource to be used by the first UE, where the transmission resource includes at least one of the following: Modulation coding mode MCS, transmission power and time-frequency resources;
  • the second UE sends the second reference signal to the first UE.
  • the first feedback information includes a second reference signal, where the second The reference signal is determined according to a predefined sequence.
  • the signal quality information includes at least one of the following: a reference signal receiving power RSRP And reference signal reception quality RSRQ, received signal strength indication RSSI, channel quality indication CQI, and adjustment information of the CQI;
  • the transmission power information includes adjustment information of a value of transmission power and/or transmission power.
  • the second UE may send the first feedback information to the first UE in a twelfth possible implementation manner of the foregoing ,include:
  • the second UE sends the first feedback information to the first UE according to a feedback resource.
  • the first UE sends the first feedback information to the Before the first UE, it also includes:
  • the second UE receives configuration information sent by the serving base station of the second UE, where the configuration information includes second indication information, where the second indication information is used to indicate a location of the feedback resource.
  • the first UE sends the first feedback information to the Before the first UE, it also includes:
  • the second UE acquires the association information, and receives the transmission resource sent by the first UE, where the association information is used to indicate an association relationship between the transmission resource and the feedback resource, where the association information is Pre-defined or the association information is received from a serving base station of the second UE;
  • the second UE determines the feedback resource according to the association information and the transmission resource.
  • the first UE sends the first feedback information to the Before the first UE, it also includes:
  • the second UE Receiving, by the second UE, the feedback resource that is sent by the first UE, where the feedback resource is determined by the first UE according to a transmission resource and a slave association information, where the association information is used to indicate the location Determining an association relationship between the transmitting resource and the feedback resource.
  • the feedback resource is autonomous from the feedback resource pool by the second UE
  • the feedback resource pool is pre-configured or the feedback resource pool is received from a serving base station of the second UE.
  • the first UE and the second UE are located in the same cell, in the seventeenth possible implementation manner of The serving base station of the first UE and the serving base station of the second UE are the same base station.
  • a method for device-to-device D2D communication including:
  • the first user equipment UE generates a transmission signal
  • the first UE receives the first feedback information sent by the second UE.
  • the transmitting signal is a first reference signal
  • the first reference signal is used to perform quality measurement on the D2D link
  • the first feedback information includes signal quality information and/or transmit power information of the D2D link.
  • the transmitting signal is a data packet
  • the first feedback information includes a response after the second UE demodulates the data packet.
  • Information, wherein the response information is a negative acknowledgement information NACK that demodulates the correct acknowledgement information ACK or demodulation error.
  • the data packet includes first indication information, where the first indication information is used to indicate the following At least one of: an identification ID of the first UE, an ID of the second UE, and an ID of the D2D link.
  • the first feedback information further includes: Signal quality information and/or transmit power information for the D2D link.
  • the method further includes:
  • the first UE receives second feedback information sent by the second UE, where the second feedback information includes signal quality information and/or transmit power information of the D2D link.
  • the method further includes:
  • the first UE suspends the untransmitted retransmission packet of the transmitted data packet, and sends the new data packet to be sent to the second UE according to the current configuration parameter.
  • the method further includes:
  • the first UE adjusts configuration parameters according to the signal quality information and/or transmit power information
  • the method further includes:
  • the first UE sends the retransmission packet of the sent data packet to the second UE according to the current configuration parameter
  • the first UE increases the number of retransmissions of the transmitted data packet or changes the retransmission pattern, and retransmits the retransmitted data packet. Send to the second UE.
  • the method further includes:
  • the first UE adjusts the configuration parameter according to the signal quality information and/or the transmission power information
  • the method further includes:
  • the first UE adjusts the configuration parameter according to the signal quality information and/or the transmission power information
  • the first UE sends a subsequent data packet to the second UE according to the adjusted configuration parameter.
  • the first UE receives the first configuration information that is sent by the serving base station of the first UE, where the first configuration information includes at least one of the following: retransmission times or retransmission pattern configuration information, and transmit power Or the adjustment information of the transmit power, the information of the modulation and coding mode MCS used, and the indication information of the used time-frequency resource, and the first configuration information is sent by the serving base station of the first UE according to the second UE. Determined by the second feedback information;
  • the first UE adjusts configuration parameters according to the first configuration information, and sends subsequent data packets to the second UE according to the adjusted configuration parameters.
  • the first configuration information further includes information for indicating an ID of the D2D link.
  • the configuration parameter includes at least one of the following: a modulation coding mode, an MCS level, and a weight The number of transmissions, retransmission pattern information, transmission power information, and indication information of time-frequency resources.
  • ,Also before the first UE sends the transmit signal to the second UE, ,Also includes:
  • the first UE sends the scheduling allocation SA indication information to the second UE, so that the second UE receives the transmission signal according to the SA indication information,
  • the SA indication information includes information about a transmission resource to be used by the first UE, where the transmission resource includes at least one of a modulation coding mode MCS, a transmission power, and a time-frequency resource.
  • the first UE receives a second reference signal sent by the second UE, where the second reference signal is determined according to a predefined sequence.
  • the first feedback information further includes a second reference signal, where The second reference signal is determined according to a predefined sequence.
  • the signal quality information includes at least one of: reference signal received power RSRP, reference signal received quality RSRQ, received signal strength indicator RSSI, channel quality indicator CQI, and adjustment information of the CQI;
  • the transmission power information includes adjustment information of a value of transmission power and/or transmission power.
  • the first UE sends the transmission signal to the second UE according to a transmission resource.
  • the method further includes:
  • the first UE receives the second configuration information that is sent by the serving base station of the first UE, where the second configuration information includes second indication information, where the second indication information is used to indicate the location of the transmitting resource. .
  • the transmit resource is autonomously selected by the first UE from a pool of transmit resources, wherein the transmit resource pool is pre-configured or the transmit resource pool is received from a serving base station of the first UE.
  • the method further includes:
  • the first UE acquires the association information, and receives the feedback resource sent by the second UE, where the association information is used to indicate an association relationship between the transmission resource and the feedback resource, where the association information is Pre-defined or the association information is received from a serving base station of the first UE;
  • the first UE determines the transmitting resource according to the association information and the feedback resource.
  • the method further includes:
  • the first UE acquires association information, where the association information is used to indicate an association relationship between the transmission resource and a feedback resource, the association information is predefined or the association information is from the first Received by the serving base station of the UE;
  • the first UE determines a feedback resource according to the association information and the transmission resource.
  • the first feedback information sent by the second UE including:
  • the first UE receives the first feedback information sent by the second UE according to the feedback resource.
  • the first UE and the second UE are located in the same cell, and the serving base station of the first UE and the serving base station of the second UE are the same base station.
  • a method for device-to-device D2D communication comprising:
  • the base station receives the feedback information sent by the second user equipment UE, where the feedback information includes signal quality information and/or transmission power information of the D2D link between the first UE and the second UE;
  • the base station generates first configuration information according to the feedback information
  • the base station sends the first configuration information to a first UE, where the base station is a serving base station of the first UE.
  • the method further includes:
  • the second configuration information includes a transmit resource pool and/or a gateway for the D2D link.
  • the association information is used to indicate an association relationship between the transmission resource and the feedback resource.
  • the first UE and the second UE are located in the same cell, and the method further includes:
  • the third configuration information includes a feedback resource pool and/or association information for the D2D link, where the association information is used to indicate an association relationship between the transmission resource and the feedback resource.
  • the first UE and the second UE are located in different cells, the base station Receiving feedback information sent by the second UE, including:
  • the base station receives feedback information sent by the second UE from a serving base station of the second UE.
  • the first configuration information includes at least one of the following: a retransmission number or The configuration information of the retransmission pattern, the adjustment information of the transmission power or the transmission power, the information of the modulation coding mode MCS used, and the indication information of the used time-frequency resource.
  • the first configuration information further includes information for indicating an identifier ID of the D2D link.
  • the feedback information further includes indication information, where the indication information is used to indicate At least one of the following: an ID of the first UE, an ID of the second UE, and an ID of the D2D link.
  • the signal quality information includes at least one of: a reference signal received power RSRP, Reference signal reception quality RSRQ, received signal strength indication RSSI, channel quality indication CQI, and adjustment information of the CQI;
  • the transmission power information includes adjustment information of a value of transmission power and/or transmission power.
  • a method for device-to-device D2D communication comprising:
  • the second base station receives the feedback information sent by the second user equipment UE, where the feedback information includes signal quality information and/or transmit power information of the D2D link between the first UE and the second UE, where the The second base station is a serving base station of the second UE;
  • the second base station sends the feedback information to the first base station, where the first base station is a serving base station of the first UE, and the first UE and the second UE are located in different cells.
  • the method further includes:
  • the configuration information includes a feedback resource pool and/or association information for the D2D link, where the association information is used to indicate an association relationship between a transmission resource and a feedback resource.
  • the feedback information further includes indication information, where the indication information is used to indicate the following At least one of: an identification ID of the first UE, an ID of the second UE, and an ID of the D2D link.
  • the signal quality information includes at least one of the following: a reference signal received power RSRP, Reference signal reception quality RSRQ, received signal strength indication RSSI, channel quality indication CQI, and adjustment information of the CQI;
  • the transmission power information includes adjustment information of a value of transmission power and/or transmission power.
  • the user equipment UE is provided, where the UE is a second UE, including:
  • a receiver configured to receive a transmit signal sent by the first UE, where the transmit signal is transmitted by using a D2D link between the first UE and the second UE;
  • a processor configured to generate first feedback information according to the transmit signal received by the receiver
  • a transmitter configured to send the first feedback information generated by the processor to the first UE.
  • the transmitting signal is a first reference signal
  • the first reference signal is used to perform quality measurement on the D2D link
  • the first feedback information includes signal quality information and/or transmit power information of the D2D link.
  • the transmitter is further configured to send the first feedback information to the The serving base station of the second UE.
  • the transmitting signal is a data packet
  • the first feedback information includes: a response after the second UE demodulates the data packet Information, wherein the response information is a negative acknowledgement information NACK that demodulates the correct acknowledgement information ACK or demodulation error.
  • the data packet includes first indication information, where the first indication information is used by At least one of the following is indicated: an identification ID of the first UE, an ID of the second UE, and an ID of the D2D link.
  • the first feedback information further includes signal quality information of the D2D link and / or transmit power information.
  • the processor is further configured to generate a second according to the demodulated result Feedback information, where the second feedback information includes signal quality information and/or transmit power information of the D2D link;
  • the transmitter is further configured to send the second feedback information generated by the processor to a serving base station of the first UE and/or the second UE.
  • the transmitter sends the second feedback information to the second UE Service base station
  • the second feedback information further includes first indication information, where the first indication information is used to indicate at least one of: an ID of the first UE, an ID of the second UE, and the D2D chain The ID of the road.
  • the receiver is further configured to: receive scheduling allocation SA indication information sent by the first UE, where the SA indication information includes information about a transmission resource to be used by the first UE, where the transmission resource includes the following At least one of: modulation coding mode MCS, transmission power, and time-frequency resources;
  • the receiver is specifically configured to: receive, according to the SA indication information, the transmit signal sent by the first UE.
  • the processor is further configured to generate, according to the a second reference signal, wherein the second reference signal is determined according to a predefined sequence;
  • the transmitter is further configured to send the second reference signal to the first UE.
  • the first feedback information includes a second reference signal, wherein the second The reference signal is determined according to a predefined sequence.
  • the signal quality information includes at least one of the following: a reference signal receiving power RSRP And reference signal reception quality RSRQ, received signal strength indication RSSI, channel quality indication CQI, and adjustment information of the CQI;
  • the transmission power information includes adjustment information of a value of transmission power and/or transmission power.
  • the transmitter is configured to: according to the feedback resource, the first The feedback information is sent to the first UE.
  • the first feedback information is sent to the first Before a UE
  • the receiver is further configured to: receive configuration information sent by the serving base station of the second UE, where the configuration information includes second indication information, where the second indication information is used to indicate a location of the feedback resource .
  • the first feedback information is sent to the first Before a UE
  • the receiver is further configured to acquire association information, and receive a transmission resource that is sent by the first UE, where the association information is used to indicate an association relationship between the transmission resource and the feedback resource,
  • the association information is predefined or the association information is received from a serving base station of the second UE;
  • the processor is further configured to determine the feedback resource according to the association information and the transmission resource.
  • the first feedback information is sent by the sender to the first Before a UE, the receiver is further used to:
  • the feedback resource receives, by the first UE, the feedback resource, where the feedback resource is determined by the first UE according to a transmission resource and a slave association information, where the association information is used to indicate the The relationship between the feedback resources.
  • the feedback resource is autonomous from the feedback resource pool by the second UE
  • the feedback resource pool is pre-configured or the feedback resource pool is received from a serving base station of the second UE.
  • the first UE and the second UE are located in the same cell,
  • the serving base station of the first UE and the serving base station of the second UE are the same base station.
  • the user equipment UE is provided, where the UE is a first UE, including:
  • a transmitter configured to send the transmit signal generated by the processor to a second UE, where the transmit signal is transmitted by using a D2D link between the first UE and the second UE;
  • a receiver configured to receive first feedback information sent by the second UE.
  • the transmitting signal is a first reference signal
  • the first reference signal is used to perform quality measurement on the D2D link
  • the first feedback information includes signal quality information and/or transmit power information of the D2D link.
  • the transmitting signal is a data packet
  • the first feedback information includes the second The response information obtained by the UE after demodulating the data packet, wherein the response information is a negative acknowledgement information ACK for demodulating the correct acknowledgement information ACK or a demodulation error.
  • the data packet includes first indication information, where the first indication information is used to indicate at least one of: the first An identification ID of the UE, an ID of the second UE, and an ID of the D2D link.
  • the first feedback information further includes: signal quality information of the D2D link And/or transmit power information.
  • the receiver is further configured to receive, by the second UE, Second feedback information, wherein the second feedback information includes signal quality information and/or transmit power information of the D2D link.
  • the processor is further used to :
  • the untransmitted retransmission packet of the transmitted data packet is suspended, and the new data packet to be transmitted is sent to the second UE according to the current configuration parameter.
  • the processor is further used to :
  • the processor is further used to :
  • the retransmission packet of the transmitted data packet is sent to the second UE according to the current configuration parameter
  • the retransmission packet of the transmitted data packet has been sent, increase the number of retransmissions of the transmitted data packet or change the retransmission pattern, and send the retransmission packet of the sent data packet to the first Two UEs.
  • the processor is further used to: :
  • the processor is further used to :
  • Subsequent data packets are sent to the second UE according to the adjusted configuration parameters.
  • the receiver is further configured to receive the serving base station of the first UE, in an eleventh possible implementation manner of the tenth aspect,
  • the first configuration information that is sent where the first configuration information includes at least one of: retransmission times or retransmission pattern configuration information, transmission power or transmission power adjustment information, and modulation coding mode used by the MCS.
  • the information and the indication information of the used time-frequency resource, and the first configuration information is determined by the serving base station of the first UE according to the second feedback information sent by the second UE;
  • the processor is further configured to adjust configuration parameters according to the first configuration information
  • the transmitter is further configured to send a subsequent data packet to the second UE according to the adjusted configuration parameter.
  • the first configuration information further includes ID information.
  • the configuration parameter includes at least one of the following: a modulation coding mode MCS level, Retransmission times, retransmission pattern information, transmission power information, and indication information of time-frequency resources.
  • the transmitter before the sending, by the transmitter, the transmitting signal to the second UE, the transmitter is further configured to:
  • the SA indication information includes information about a transmission resource to be used by the first UE, where the transmission resource includes at least one of a modulation coding mode MCS, a transmission power, and a time-frequency resource.
  • the receiver is further configured to receive the second A second reference signal, wherein the second reference signal is determined according to a predefined sequence.
  • the first feedback information further includes a second reference signal, where The second reference signal is determined according to a predefined sequence.
  • the signal quality information includes at least one of the following: a reference signal receiving power RSRP And reference signal reception quality RSRQ, received signal strength indication RSSI, channel quality indication CQI, and adjustment information of the CQI;
  • the transmission power information includes adjustment information of a value of transmission power and/or transmission power.
  • the transmitter is configured to: A signal is sent to the second UE.
  • the receiver before the sending, by the transmitter, the transmitting signal to the second UE, the receiver is further configured to:
  • Second configuration information that is sent by the serving base station of the first UE, where the second configuration information includes second indication information, where the second indication information is used to indicate a location of the transmitting resource.
  • the transmitting resource is autonomous from the transmitting resource pool by the first UE
  • the transmit resource pool is pre-configured or the transmit resource pool is received from a serving base station of the first UE.
  • the receiver is further configured to obtain the association information, and receive the feedback resource sent by the second UE, where the association information is used to indicate an association relationship between the transmission resource and the feedback resource,
  • the association information is predefined or the association information is received from a serving base station of the first UE;
  • the processor is further configured to determine the transmit resource according to the association information and the feedback resource.
  • the receiver is further configured to acquire association information, where the association information is used to indicate an association relationship between the transmission resource and a feedback resource, where the association information is predefined or the associated information is from the Received by the serving base station of the first UE;
  • the processor is further configured to determine a feedback resource according to the association information and the transmission resource.
  • the receiver is configured to: receive according to the feedback resource, in the twenty-third possible implementation manner of the tenth aspect, The first feedback information sent by the second UE.
  • the first UE and the second UE are located in the same cell,
  • the serving base station of the first UE and the serving base station of the second UE are the same base station.
  • a base station comprising:
  • a receiver configured to receive feedback information sent by the second user equipment UE, where the feedback information includes signal quality information and/or transmit power information of a D2D link between the first UE and the second UE;
  • a processor configured to generate first configuration information according to the feedback information received by the receiver
  • a transmitter configured to send the first configuration information generated by the processor to the first UE, where the base station is a serving base station of the first UE.
  • the transmitter is further configured to send the second configuration information to the first UE,
  • the second configuration information includes a transmission resource pool and/or association information for the D2D link, where the association information is used to indicate an association relationship between the transmission resource and the feedback resource.
  • the first UE and the second UE are located in a same cell,
  • the transmitter is further configured to send third configuration information to the second UE, where
  • the third configuration information includes a feedback resource pool and/or association information for the D2D link, where the association information is used to indicate an association relationship between the transmission resource and the feedback resource.
  • the first UE and the second UE are located in different cells,
  • the receiver is specifically configured to:
  • the first configuration information includes at least one of the following: The configuration information of the number of transmissions or retransmission patterns, the adjustment information of the transmission power or the transmission power, the information of the modulation coding mode MCS used, and the indication information of the used time-frequency resources.
  • the first configuration information further includes Information of the road ID.
  • the feedback information further includes indication information, where the indication information And indicating at least one of: an ID of the first UE, an ID of the second UE, and an ID of the D2D link.
  • the signal quality information includes at least one of the following: a reference signal receiving Power RSRP, reference signal reception quality RSRQ, received signal strength indication RSSI, channel quality indication CQI, and adjustment information of the CQI;
  • the transmission power information includes adjustment information of a value of transmission power and/or transmission power.
  • a base station where the base station is a second base station, including:
  • a receiver configured to receive feedback information sent by the second user equipment UE, where the feedback information includes signal quality information and/or transmit power information of a D2D link between the first UE and the second UE, where Said second base station is a serving base station of said second UE;
  • a transmitter configured to send the feedback information received by the receiver to a first base station, where the first base station is a serving base station of a first UE, and the first UE and the second UE are located in different Community.
  • the transmitter is further configured to send configuration information to the second UE,
  • the configuration information includes a feedback resource pool and/or association information for the D2D link, where the association information is used to indicate an association relationship between a transmission resource and a feedback resource.
  • the feedback information further includes indication information, where the indication information is used by At least one of the following indications: an identifier ID of the first UE, the second UE ID and ID of the D2D link.
  • the signal quality information includes at least one of the following: a reference signal receiving Power RSRP, reference signal reception quality RSRQ, received signal strength indication RSSI, channel quality indication CQI, and adjustment information of the CQI;
  • the transmission power information includes adjustment information of a value of transmission power and/or transmission power.
  • the second UE after receiving the transmission signal sent by the first UE through the D2D link, the second UE that is the receiver generates the first feedback information, and sends the first feedback information to the first UE.
  • the first UE can be made to acquire the reception quality of the second UE, so that the QoS of the D2D communication can be guaranteed.
  • FIG. 1 is a schematic diagram of a scenario in which a first UE and a second UE are located in the same cell.
  • FIG. 2 is a schematic diagram of a scenario in which a first UE and a second UE are located in different cells.
  • FIG. 3 is a structural block diagram of a user equipment according to an embodiment of the present invention.
  • FIG. 4 is a structural block diagram of a user equipment according to another embodiment of the present invention.
  • FIG. 5 is a structural block diagram of a base station according to an embodiment of the present invention.
  • FIG. 6 is a structural block diagram of a base station according to another embodiment of the present invention.
  • FIG. 7 is a flow chart of a method of D2D communication in accordance with an embodiment of the present invention.
  • FIG. 8 is an example of a signal transmitted by a first UE according to an embodiment of the present invention.
  • FIG. 9 is a flow chart of a method of D2D communication in accordance with another embodiment of the present invention.
  • FIG. 10 is another example of a signal transmitted by a first UE according to an embodiment of the present invention.
  • 11 is another example of a signal transmitted by a first UE according to an embodiment of the present invention.
  • FIG. 12 is another example of a signal transmitted by a first UE according to an embodiment of the present invention.
  • FIG. 13 is a flow chart of a method for D2D communication in accordance with another embodiment of the present invention.
  • FIG. 14 is a flow chart of a method for D2D communication in accordance with another embodiment of the present invention.
  • FIG. 15 is a signaling flow diagram of D2D communication in accordance with one embodiment of the present invention.
  • 16 is a signaling flow diagram of D2D communication in accordance with another embodiment of the present invention.
  • Figure 17 is a signaling flow diagram of D2D communication in accordance with another embodiment of the present invention.
  • FIG. 19 is a structural block diagram of a user equipment according to another embodiment of the present invention.
  • FIG. 20 is a structural block diagram of a user equipment according to another embodiment of the present invention.
  • Figure 21 is a block diagram showing the structure of a base station according to another embodiment of the present invention.
  • Figure 22 is a block diagram showing the structure of a base station according to another embodiment of the present invention.
  • GSM Global System of Mobile communication
  • CDMA Code Division Multiple Access
  • WCDMA Wideband Code Division Multiple Access
  • GPRS General Packet Radio Service
  • LTE Long Term Evolution
  • FDD Frequency Division Duplex
  • TDD Time Division Duplex
  • UMTS Universal Mobile Telecommunication System
  • a UE may also be referred to as a terminal, a subscriber unit, a subscriber station, a mobile station, a mobile station, a remote station, a remote terminal, a mobile device, a user terminal, a mobile terminal, a wireless communication device, a user agent, or a user device, and may be accessed via a wireless access network.
  • RAN Radio Access Network
  • the UE may be a cellular phone, a cordless phone, a Session Initiation Protocol (SIP) phone, a Wireless Local Loop (WLL) station, a Personal Digital Assistant (PDA), with wireless communication.
  • SIP Session Initiation Protocol
  • WLL Wireless Local Loop
  • PDA Personal Digital Assistant
  • the UEs involved in the embodiments of the present invention are all UEs that support the D2D function.
  • the base station may be a Base Transceiver Station (BTS) in GSM or CDMA, or may be a base station (NodeB) in WCDMA, or may be an eNB or an e-NodeB in LTE.
  • BTS Base Transceiver Station
  • NodeB base station
  • eNB eNodeB
  • LTE Long Term Evolution
  • the link of direct communication between devices is represented by D2D, but it can be understood that a side link (Sidelink, SL) may also be used to represent a link of direct communication between devices to The cellular link is different, and the present invention does not limit this. That is to say, the D2D in the embodiment of the present invention can be replaced with SL.
  • the Scheduling Assignment (SA) indication information is used to indicate the control information of the D2D link
  • SCI Sidelink Control Information
  • the information is not limited by the present invention. That is, the SA indication information in the embodiment of the present invention may be replaced by an SCI.
  • the channel for transmitting the SCI may be a Physical Side Link Control Channel (PSCCH).
  • PSCCH Physical Side Link Control Channel
  • a physical D2D Synchronization Channel (PD2DSCH) is used to represent a control channel for D2D link synchronization source transmission, and a side link broadcast channel (Sidelink Broadcast Channel, SL) may also be used.
  • -BCH Sidelink Broadcast Channel
  • -BCH to indicate a control channel for D2D link synchronization source transmission, which is not limited by the present invention. That is to say, the PD2DSCH in the embodiment of the present invention can be replaced with the SL-BCH.
  • D2D communication refers to that one UE sends control information and data, and other UEs obtain information such as a transmission format of subsequent data by reading the control information, thereby correctly receiving subsequent data.
  • Mode 1 refers to a resource used by a base station or a relay node to schedule data and control information used by the UE for transmitting D2D.
  • the control information may be a Scheduling Assignment (SA) message.
  • SA Scheduling Assignment
  • the base station instructs the UE to send the resource and format of the scheduling allocation and data through downlink signaling.
  • Mode 2 means that the UE itself selects resources for transmitting direct communication data and SA messages from a resource pool (which may be referred to as a resource pool of mode 2 of D2D communication), wherein the resource pool of mode 2 of the D2D communication
  • the resource pool of the SA message resource pool and the data corresponding to the SA message may be included.
  • the UE may select a resource for transmitting the SA message from the SA message resource pool, and select a resource for transmitting data corresponding to the SA message from the resource pool of the data corresponding to the SA message.
  • a resource pool may include a set of time-frequency resources, which is a set of multiple time-frequency resources.
  • the UE that is the transmitter is the first UE in the D2D communication
  • the UE that is the receiver is the second UE.
  • D2D communication is performed by a D2D link between the first UE and the second UE.
  • the first UE and the second UE may be located in the same cell. As shown in FIG. 1 , the first UE 110 and the second UE 120 are both located in the cell 100 of the base station 130. That is, the base station 130 is both a serving base station of the first UE 110 and a serving base station of the second UE 120. It can be understood that the first UE 110 communicates with the base station 130 through the cellular link, the second UE 120 and the base station 130 communicate through the cellular link, and the first UE 110 and the second UE 120 pass the D2D link. Communicate.
  • the first UE and the second UE may be located in different cells. As shown in FIG. 2, the first UE 210 is located in the cell 201 of the first base station 230, and the second UE 220 is located in the cell 202 of the second base station 240. That is, the first base station 230 is the serving base station of the first UE 210, and the second base station 240 is the serving base station of the second UE 220. It can be understood that the first UE 110 communicates with the first base station 230 through a cellular link, and the second UE 120 and the second base station 240 communicate through a cellular link between the first UE 110 and the second UE 120. Communicate over the D2D link.
  • FIG. 3 is a structural block diagram of a user equipment according to an embodiment of the present invention.
  • the UE 300 shown in FIG. 3 is a second UE, and includes a receiving unit 301, a processing unit 302, and a transmitting unit 303.
  • the receiving unit 301 is configured to receive a transmit signal sent by the first UE, where the transmit signal is transmitted by using a D2D link between the first UE and the second UE;
  • the processing unit 302 is configured to generate first feedback information according to the transmit signal received by the receiving unit 301.
  • the sending unit 303 is configured to send the first feedback information generated by the processing unit 302 to the first UE.
  • the second UE after receiving the transmission signal sent by the first UE through the D2D link, the second UE that is the receiver generates the first feedback information, and sends the first feedback information to the first UE.
  • the first UE can be made to acquire the reception quality of the second UE, so that the QoS of the D2D communication can be guaranteed.
  • the sending unit 303 sends the first feedback information to the first UE by using the D2D link.
  • the transmit signal received by the receiving unit 301 may be a first reference signal, and the first reference signal is used to perform quality measurement on the D2D link. Then, the first feedback information generated by the processing unit 302 may include signal quality information and/or transmit power information of the D2D link.
  • the first reference signal may be a D2D Synchronization Signal (D2DSS).
  • D2DSS D2D Synchronization Signal
  • the first reference signal may also be a newly defined reference signal dedicated to performing D2D channel quality measurement. The invention is not limited thereto.
  • the UE 300 can estimate the signal quality of the D2D link from the transmitted signal and generate signal quality information.
  • the signal quality information may include at least one of the following: Reference Signal Received Power (RSRP), Reference Signal Received Quality (RSRQ), Received Signal Strength Indication (Received Signal Strength Indication) , RSSI), Channel Quality Indicator (CQI), and adjustment information of the CQI.
  • the transmit power information may include adjustment information of a value of transmit power and/or transmit power.
  • the UE 300 can pre-store all supported antenna configurations and various Signal to Noise Ratio (SNR) thresholds that can be correctly demodulated under various Modulation and Coding Scheme (MCS) levels. .
  • SNR Signal to Noise Ratio
  • MCS Modulation and Coding Scheme
  • the UE 300 can calculate a current equivalent SNR value based on the transmitted signal. Further, the UE 300 may calculate the adjustment information ⁇ CQI of the CQI, the CQI, and the adjustment information ⁇ P of the transmission power according to the equivalent SNR value. In this way, processing unit 302 can generate first feedback information.
  • the sending unit 303 may also send the first feedback information to the serving base station of the second UE by using a cellular link, so that the serving base station of the second UE acquires channel quality information of the D2D link.
  • the sending unit 303 may send the first feedback information to the first UE according to the feedback resource.
  • the receiving unit 301 may receive configuration information that is sent by the serving base station of the second UE, where the configuration information includes second indication information, where the second indication information is used to indicate a location of the feedback resource; The second UE determines the feedback resource according to the configuration information.
  • the serving base station of the second UE can send configuration information to the second UE by using signaling.
  • the signaling may be public signaling, such as a System Information Block (SIB).
  • SIB System Information Block
  • RRC radio resource control
  • the signaling may also be dedicated signaling sent to the second UE, such as Downlink Control Information (DCI) signaling.
  • DCI Downlink Control Information
  • the signaling may also be dedicated RRC signaling.
  • the invention is not limited thereto.
  • the receiving unit 301 may acquire association information, and receive the first UE The transmitting resource is sent; further, the processing unit 302 may determine the feedback resource according to the association information and the transmitting resource.
  • the association information is used to indicate an association relationship between the transmission resource and the feedback resource, the association information may be predefined, or the association information may be received from a serving base station of the second UE. of.
  • the first UE may send the transmission resource to the second UE through the SA control channel, or through a physical D2D Synchronization Channel, or through a data channel.
  • the first UE may send the transmission resource to the second UE by sending SA indication information.
  • association information can be pre-configured on the second UE, or the serving base station of the second UE can send the association information to the second UE by using signaling.
  • the transmission resource pool can be pre-configured on the first UE, or the serving base station of the first UE can configure the transmission resource pool for the unicast link to the first UE by using signaling. In this way, the first UE can select a transmission resource from the pool of transmission resources.
  • the transmit resource pool is a collection of transmit resources.
  • processing unit 302 can calculate the feedback resource according to the transmission resource and the association information.
  • processing unit 302 may calculate the frequency domain location included in the feedback resource by (a*Nprb+b) mod Nm.
  • Nprb is the location of the transmission resource in the frequency domain
  • Nm is the maximum number of feedback resources provided
  • mod represents the modulo operation.
  • processing unit 302 calculates the location of the radio frame or subframe occupied on the time domain included in the feedback resource. It may be a time domain location of a D2D feedback resource that is closest to the time after receiving the transmission resource and greater than a certain time threshold (eg, 4 ms). For example, in the third subframe of the current radio frame, the currently transmitted data packet is received, and the nearest subframe 6 and the subframe 8 have feedback resources, but the interval between the subframe 6 and the subframe 3 is smaller than The threshold is 4ms, so subframe 8 is selected as the time domain location of the feedback resource.
  • a certain time threshold eg, 4 ms
  • the receiving unit 301 can receive the feedback resource sent by the first UE.
  • the feedback resource is determined by the first UE according to the transmission resource and the association information, and the association information is used to indicate an association relationship between the transmission resource and the feedback resource.
  • the transmitting resource and the association information may be that the first UE is received from a serving base station of the first UE; or, the transmitting resource and the association information may be pre-configured on the first UE; or, transmitting The resource may be that the first UE is received from a serving base station of the first UE, And the association information is pre-configured on the first UE.
  • the transmission resource pool and associated information can be pre-configured on the first UE.
  • the association information may be pre-configured on the first UE, and the serving base station of the first UE configures, by using signaling, a transmission resource pool for the unicast link to the first UE.
  • the serving base station of the first UE may configure, by using signaling, a transmit resource pool and associated information for the unicast link to the first UE. In this way, the first UE may select a transmission resource from the transmission resource pool, and determine a feedback resource according to the transmission resource and the association information.
  • the feedback resource may be autonomously selected by the second UE from a pool of feedback resources, where the feedback resource pool is pre-configured or the feedback resource pool is from the second UE. Received by the serving base station.
  • the feedback resource pool can be pre-configured on the second UE.
  • the serving base station of the second UE may configure a feedback resource pool for the unicast link to the second UE by using signaling.
  • the feedback resource pool is a collection of feedback resources.
  • the association information is used to indicate an association relationship between a transmitting resource and a feedback resource.
  • the association relationship may include that an offset value exists between a transmit power included in the feedback resource and a transmit power included in the transmit resource according to a predefined rule.
  • the association relationship may include: the cyclic prefix (Cyclic Prefix, CP) type included in the feedback resource is the same as the CP type included in the transmission resource.
  • the transmit power included in the feedback resource may be understood as the transmit power when the second UE sends the first feedback information to the first UE, or may be simply referred to as the transmit power fed back by the second UE.
  • the transmit power included in the transmit resource may be understood as the transmit power when the first UE transmits the transmit signal, or may be simply referred to as the transmit power sent by the first UE.
  • the transmit power of the second UE is different from the transmit power of the first UE, and may be expressed as the transmit power when the second UE feeds back, and the transmit power when the first UE is sent is equal to the difference.
  • the difference may be a fixed value, for example, the difference is equal to 3 dB or -3 dB.
  • the difference can be calculated from other available parameters.
  • the difference may be related to the MCS level; that is, the difference may be determined according to the MCS level when the second UE feeds back and the MCS level when the first UE transmits. The invention is not limited thereto.
  • the transmission signal received by the receiving unit 301 can be a data packet.
  • the first feedback information generated by the processing unit 302 may include response information after the second UE demodulates the data packet.
  • the response information is demodulation correct acknowledgement information (ACK) or negative acknowledgement information (Negative Acknowledgement (NACK).
  • the processing unit 302 can demodulate the data packet and determine whether the demodulation is correct by decoding. If the demodulation is correct, the response message is ACK; if the demodulation is incorrect, the response message is NACK.
  • the first feedback information may further include signal quality information and/or transmit power information of the D2D link.
  • the processing unit 302 generates second feedback information according to the result of the demodulation, and the sending unit 303 sends the second feedback information to the serving UE of the first UE and/or the second UE.
  • the second feedback information includes signal quality information and/or transmit power information of the D2D link.
  • the sending unit 303 may send the second feedback information to the first UE by using a D2D link, and may send the second feedback information to the serving base station of the second UE by using a cellular link.
  • the processing unit 302 may estimate the signal quality of the D2D link according to the transmitted signal, and generate signal quality information.
  • the signal quality information may include at least one of the following: a reference signal received power RSRP, a reference signal received quality RSRQ, a received signal strength indicator RSSI, a channel quality indicator CQI, and adjustment information of the CQI.
  • the transmit power information may include adjustment information of a value of transmit power and/or transmit power.
  • the RSRP, the RSRQ, the RSSI, and the CQI may be determined by the second UE according to a DeModulation Reference Signal (DMRS) included in the data packet. That is, the packet includes a DMRS.
  • DMRS DeModulation Reference Signal
  • the signal quality information may be determined based on the DMRS in the PD2DSCH, or may be based on a D2D synchronization signal (D2D Synchronization Signal) sent together with the PD2DSCH. D2DSS) determined.
  • the data packet may be one or more of the following: an SA, a data packet corresponding to the data, and a data packet included in the PD2DSCH.
  • the first indication information may be included in the data packet sent by the first UE to the second UE.
  • the first indication information is used to indicate at least one of the following: an identifier of the first UE (Identity, ID), an ID of the second UE, and an ID of the D2D link.
  • an identifier of the first UE Identity, ID
  • ID an ID of the second UE
  • ID of the D2D link an ID of the D2D link.
  • the second UE can know who the first UE is, and/or who its target UE is, and/or which of the target D2D links, based on the received data packet from the first UE.
  • the sending unit 303 may send the second feedback information to the serving base station of the second UE, where the second feedback information may further include the first indication information.
  • the first indication information is used to indicate at least one of: an ID of the first UE, an ID of the second UE, and an ID of the D2D link.
  • the serving base station of the second UE can know which D2D link the signal quality information and/or the transmission power information in the second feedback information is for.
  • the ID of the first UE may be an International Mobile Subscriber Identification Number (IMSI) number of the first UE, or may be a network temporary identifier of the first UE.
  • the ID of the second UE may be the MISI number of the second UE, or may be the network temporary identifier of the second UE.
  • the ID of the D2D link may be a Radio Network Temporary Identity (RNTI) of the D2D link, that is, a D2D-RNTI.
  • RNTI Radio Network Temporary Identity
  • the order of sending time of the first feedback information and the second feedback information is not limited.
  • the second UE may simultaneously send the first feedback information and the second feedback information to the first UE.
  • the second UE may also send the first feedback information to the first UE, so that the first UE determines whether the last data transmission is correct in a short time; and then sends the second feedback information to the first UE. .
  • the second UE may simultaneously send the first feedback information and the second feedback information to the first UE, and send the second feedback information to the serving base station of the second UE.
  • the second UE may first send the first feedback information to the first UE, and then send the second feedback information to the serving base station of the first UE and the second UE at the same time.
  • the second UE may first send the first feedback information and the second feedback information to the first UE, and then send the second feedback information to the serving base station of the second UE. This embodiment of the present invention does not limit this.
  • the second UE may send the first feedback information to the first UE while transmitting the second feedback information to the serving base station of the second UE.
  • the second UE may first send the first feedback information to the first UE, and then send the second feedback information to the serving base station of the second UE.
  • the first UE may determine whether the last data transmission is correct within a short period of time to determine whether a retransmission of the transmitted data packet is required. This ensures the delay of the D2D link.
  • the second UE sends the first feedback information to the first UE in time through the D2D link, at least ensuring the operation of the D2D link.
  • the first UE is not sufficient to overcome this loss after receiving the first feedback information.
  • the first UE changes the transmission power according to its own needs, it may have an unnecessary negative impact on other links, and how much the transmission power is changed, and should not be completely determined by the first UE.
  • the size of the data packet to be transmitted is fixed, if the MCS level is lowered, it means that more time-frequency resources need to be used.
  • the network When the network allocates time-frequency resources to the D2D link, it fully considers the communication requirements of other cellular links and other D2D links. At this time, if the first UE arbitrarily expands the time-frequency resources used by itself, it is likely to occupy resources allocated to other UEs, thereby not only improving the reliability of the D2D link, but also other UEs in the occupied resources. Inter-frequency interference is generated, causing the performance of the first UE and other UEs to decrease. Therefore, when the first UE needs to adjust the MCS, the transmit power, and the time-frequency resource, the serving base station of the first UE performs appropriate configuration for the first UE according to the obtained second feedback information and scheduling information of other users. The entire system works effectively.
  • the serving base station of the first UE and the serving base station of the second UE are the same base station. If the first UE and the second UE are located in different cells, the serving base station of the second UE needs to send the second feedback information received from the second UE to the serving base station of the first UE by using signaling between the base stations, to The serving base station of the first UE is caused to schedule and configure the D2D link.
  • the receiving unit 301 may further receive scheduling allocation (SA) indication information sent by the first UE.
  • SA indication information includes information about a transmission resource to be used by the first UE, where the transmission resource includes at least one of the following: an MCS, a transmit power, and a time-frequency resource.
  • the processing unit 302 can receive the transmit signal sent by the first UE according to the SA indication information.
  • the processing unit 302 may generate a second reference signal according to the received transmit signal, and the sending unit 303 may send the second reference signal to the first UE.
  • the first feedback information generated by the processing unit 302 includes a second reference signal.
  • the second reference signal is determined according to a predefined sequence.
  • the second reference signal may also be referred to as a sequence reference signal.
  • the processing unit 302 can perform estimation according to the received second reference signal, and obtain Channel quality information for the D2D link.
  • the second reference signal is generated by placing the sequence on the corresponding time-frequency resource.
  • the sequence may be a pseudo-random sequence, or may be a perfect sequence, or may be a sequence of low-zero correlation regions. This embodiment of the present invention does not limit this.
  • the sequence may be an m-sequence or a Gold sequence, or may be a ZC (Zadoff-Chu) sequence, or may be a sequence of a DeModulation Reference Signal (DMRS) used in LTE uplink.
  • DMRS DeModulation Reference Signal
  • the sequence used by the DMRS can be generated by a predefined sequence and a ZC sequence.
  • sequence of the DMRS corresponding to the cyclic shift can be further generated as follows:
  • the parameters to be confirmed may be determined according to the SA indication information received from the first UE. For example, if the SA includes an 8-bit ID, then the second UE can use all or part of the 8-bit to calculate the root sequence number q or the cyclic shift value ⁇ of the sequence. computational The method can be done with a predefined formula.
  • the cyclic shift value ⁇ may be indicated by a number of bits of the ID in the SA (such as some 3 bits therein); the value of the OCC may also be indicated by a number of bits of the ID in the SA (such as one of the bits); the root sequence number q of the sequence is indicated by a number of bits of the ID in the SA.
  • the sending unit 303 may send the first feedback information to the first UE according to the feedback resource.
  • the receiving unit 301 may receive configuration information that is sent by the serving base station of the second UE, where the configuration information includes second indication information, where the second indication information is used to indicate a location of the feedback resource; The second UE determines the feedback resource according to the configuration information.
  • the serving base station of the second UE can send configuration information to the second UE by using signaling.
  • the signaling may be public signaling, such as a System Information Block (SIB).
  • SIB System Information Block
  • RRC radio resource control
  • the signaling may also be dedicated signaling sent to the second UE, such as Downlink Control Information (DCI) signaling.
  • DCI Downlink Control Information
  • the signaling may also be dedicated RRC signaling.
  • the invention is not limited thereto.
  • the receiving unit 301 may acquire the association information and receive the transmission resource sent by the first UE. Further, the processing unit 302 may determine the feedback resource according to the association information and the transmission resource.
  • the association information is used to indicate an association relationship between the transmission resource and the feedback resource, the association information may be predefined, or the association information may be received from a serving base station of the second UE. of.
  • the first UE may send the transmission resource to the second UE through the SA control channel, or through a Physical D2D Synchronization Channel (PD2DSCH), or through a data channel.
  • the first UE may send the transmission resource to the second UE by sending SA indication information.
  • association information can be pre-configured on the second UE, or the serving base station of the second UE can send the association information to the second UE by using signaling.
  • the transmission resource pool can be pre-configured on the first UE, or the serving base station of the first UE can configure the transmission resource pool for the unicast link to the first UE by using signaling. In this way, the first UE can select a transmission resource from the pool of transmission resources.
  • the transmit resource pool is a collection of transmit resources.
  • processing unit 302 can calculate the feedback resource according to the transmission resource and the association information.
  • processing unit 302 may calculate the frequency domain location included in the feedback resource by (a*Nprb+b) mod Nm.
  • Nprb is the location of the transmission resource in the frequency domain
  • Nm is the maximum number of feedback resources provided
  • mod represents the modulo operation.
  • processing unit 302 can calculate the location of a radio frame or subframe that is occupied in the time domain included in the feedback resource. It may be a time domain location of a D2D feedback resource that is closest to the time after receiving the transmission resource and greater than a certain time threshold (eg, 4 ms). For example, in the third subframe of the current radio frame, the currently transmitted data packet is received, and the nearest subframe 6 and the subframe 8 have feedback resources, but the interval between the subframe 6 and the subframe 3 is smaller than The threshold is 4ms, so subframe 8 is selected as the time domain location of the feedback resource.
  • a certain time threshold eg, 4 ms
  • the receiving unit 301 can receive the feedback resource sent by the first UE.
  • the feedback resource is determined by the first UE according to the transmission resource and the association information, and the association information is used to indicate an association relationship between the transmission resource and the feedback resource.
  • the transmitting resource and the association information may be that the first UE is received from a serving base station of the first UE; or, the transmitting resource and the association information may be pre-configured on the first UE; or, transmitting The resource may be that the first UE is received from a serving base station of the first UE, and the association information is pre-configured on the first UE.
  • the transmission resource pool and associated information can be pre-configured on the first UE.
  • the association information may be pre-configured on the first UE, and the serving base station of the first UE configures, by using signaling, a transmission resource pool for the unicast link to the first UE.
  • the serving base station of the first UE may configure, by using signaling, a transmit resource pool and associated information for the unicast link to the first UE. In this way, the first UE may select a transmission resource from the transmission resource pool, and determine a feedback resource according to the transmission resource and the association information.
  • the feedback resource may be autonomously selected by the second UE from a pool of feedback resources, where the feedback resource pool is pre-configured or the feedback resource pool is from the second UE. Received by the serving base station.
  • the feedback resource pool can be pre-configured on the second UE.
  • the serving base station of the second UE may configure a feedback resource pool for the unicast link to the second UE by using signaling.
  • the feedback resource pool is a collection of feedback resources.
  • the association information is used to indicate an association relationship between a transmitting resource and a feedback resource.
  • the association relationship may include: transmitting power ratio of the feedback resource There is an offset between the transmit powers included in the shot resources according to a predefined rule.
  • the association relationship may include: the cyclic prefix (Cyclic Prefix, CP) type included in the feedback resource is the same as the CP type included in the transmission resource.
  • the transmit power included in the feedback resource may be understood as the transmit power when the second UE sends the first feedback information to the first UE, or may be simply referred to as the transmit power fed back by the second UE.
  • the transmit power included in the transmit resource may be understood as the transmit power when the first UE transmits the transmit signal, or may be simply referred to as the transmit power sent by the first UE.
  • the transmit power of the second UE is different from the transmit power of the first UE, and may be expressed as the transmit power when the second UE feeds back, and the transmit power when the first UE is sent is equal to the difference.
  • the difference may be a fixed value, for example, the difference is equal to 3 dB or -3 dB.
  • the difference can be calculated from other available parameters.
  • the difference may be related to the MCS level; that is, the difference may be determined according to the MCS level when the second UE feeds back and the MCS level when the first UE transmits. The invention is not limited thereto.
  • the embodiment of the present invention associates the feedback resource with the transmission resource by using the association information, which can reduce the signaling overhead.
  • the serving base station of the first UE and the serving base station of the second UE are the same base station. If the first UE and the second UE are located in different cells, the serving base station of the first UE and the serving base station of the second UE are two different base stations, and between the serving base station of the first UE and the serving base station of the second UE Communication can be performed by signaling between base stations.
  • the UE 400 shown in FIG. 4 is a first UE, and includes a processing unit 401, a transmitting unit 402, and a receiving unit 403.
  • a processing unit 401 configured to generate a transmit signal
  • the sending unit 402 is configured to send the transmit signal generated by the processing unit 401 to the second UE, where the transmit signal is transmitted by using a D2D link between the first UE and the second UE;
  • the receiving unit 403 is configured to receive first feedback information sent by the second UE.
  • the first UE after transmitting the transmit signal to the second UE, the first UE can receive the first feedback information of the second UE. Thereby capable of acquiring the reception quality of the second UE, thereby enabling Ensuring the QoS of D2D communication.
  • the receiving unit 403 receives the first feedback information that is sent by the second UE by using the D2D link.
  • the transmit signal generated by the processing unit 401 may be a first reference signal, and the first reference signal is used to perform quality measurement on the D2D link. Then, the first feedback information received by the receiving unit 403 may include signal quality information and/or transmission power information of the D2D link.
  • the first reference signal may be a D2D Synchronization Signal (D2DSS).
  • D2DSS D2D Synchronization Signal
  • the first reference signal may also be a newly defined reference signal dedicated to performing D2D channel quality measurement. The invention is not limited thereto.
  • the signal quality information may include at least one of the following: a reference signal received power RSRP, a reference signal received quality RSRQ, a received signal strength indicator RSSI, a channel quality indicator CQI, and adjustment information of the CQI.
  • the transmit power information may include adjustment information of a value of transmit power and/or transmit power.
  • the processing unit 401 can obtain channel quality information of the D2D link between the first UE and the second UE according to the first feedback information. Further, the processing unit 401 can adjust the configuration parameter according to the first feedback information, and the first UE can send the data packet to the second UE.
  • the sending unit 402 may send the transmit signal to the second UE according to the transmit resource.
  • the receiving unit 403 may receive the second configuration information that is sent by the serving base station of the first UE, where the second configuration information includes indication information, where the indication information is used to indicate a location of the transmitting resource; The first UE determines the transmitting resource according to the second configuration information.
  • the serving base station of the first UE can send the second configuration information to the first UE by using signaling.
  • the signaling may be public signaling, such as a System Information Block (SIB).
  • SIB System Information Block
  • RRC radio resource control
  • the signaling may also be dedicated signaling sent to the first UE, such as Downlink Control Information (DCI) signaling.
  • DCI Downlink Control Information
  • the signaling may also be dedicated RRC signaling.
  • the invention is not limited thereto.
  • the receiving unit 403 may acquire association information and receive the second UE The feedback resource is sent. Further, the processing unit 401 may determine the transmission resource according to the association information and the feedback resource.
  • the association information is used to indicate an association relationship between the transmission resource and the feedback resource, the association information may be predefined, or the association information may be received from a serving base station of the first UE. of.
  • association information may be pre-configured on the first UE, or the serving base station of the first UE may send the association information to the first UE by using signaling.
  • the feedback resource pool can be pre-configured on the second UE, or the serving base station of the second UE can configure the feedback resource pool for the unicast link to the second UE by using signaling. In this way, the second UE can select a transmission resource from the feedback resource pool.
  • the feedback resource pool is a collection of feedback resources.
  • the receiving unit 403 may receive the transmission resource sent by the second UE, where the transmission resource is determined by the second UE according to the feedback resource and the association information, and the association information is used to indicate An association relationship between the transmitting resource and the feedback resource.
  • the feedback resource and the association information may be that the second UE is received from the serving base station of the second UE; or the feedback resource and the association information may be pre-configured on the second UE; or, feedback The resource may be that the second UE is received from a serving base station of the second UE, and the association information is pre-configured on the second UE.
  • the feedback resource pool and associated information can be pre-configured on the second UE.
  • the association information may be pre-configured on the second UE, and the serving base station of the second UE configures a feedback resource pool for the unicast link to the second UE by using signaling.
  • the serving base station of the second UE may configure, by signaling, a feedback resource pool and associated information for the unicast link to the second UE. In this way, the second UE may select a feedback resource from the feedback resource pool, and determine a transmission resource according to the feedback resource and the association information.
  • the transmitting resource is autonomously selected by the first UE from a pool of transmitting resources, wherein the feedback resource pool is pre-configured or the feedback resource pool is a service from the first UE. Received by the base station.
  • the transmission resource pool can be pre-configured on the first UE.
  • the serving base station of the first UE may configure, by using signaling, a transmit resource pool for the unicast link to the first UE.
  • the transmit resource pool is a collection of transmit resources.
  • the receiving unit 403 may obtain association information, where the association information is used to indicate an association relationship between the transmission resource and a feedback resource, where the association information is predefined or
  • the association information is received from a serving base station of the first UE; the processing unit 401 determines a feedback resource according to the association information and the transmission resource.
  • the receiving unit 403 can receive the first feedback information sent by the second UE according to the feedback resource.
  • the association information is used to indicate an association relationship between a transmitting resource and a feedback resource.
  • the association relationship may include that an offset value exists between a transmit power included in the feedback resource and a transmit power included in the transmit resource according to a predefined rule.
  • the association relationship may include: the cyclic prefix (Cyclic Prefix, CP) type included in the feedback resource is the same as the CP type included in the transmission resource.
  • the transmit power included in the feedback resource may be understood as the transmit power when the second UE sends the first feedback information to the first UE, or may be simply referred to as the transmit power fed back by the second UE.
  • the transmit power included in the transmit resource may be understood as the transmit power when the first UE transmits the transmit signal, or may be simply referred to as the transmit power sent by the first UE.
  • the serving base station of the first UE and the serving base station of the second UE are the same base station. If the first UE and the second UE are located in different cells, the serving base station of the first UE and the serving base station of the second UE are two different base stations, and between the serving base station of the first UE and the serving base station of the second UE Communication can be performed by signaling between base stations.
  • the transmission information generated by the processing unit 401 may be a data packet.
  • the first feedback information received by the receiving unit 403 may include response information after the second UE demodulates the data packet.
  • the response information is demodulation correct acknowledgement information (ACK) or negative acknowledgement information (Negative Acknowledgement (NACK).
  • the first feedback information may further include signal quality information and/or transmit power information of the D2D link.
  • the receiving unit 403 may further receive second feedback information sent by the second UE, where the second feedback information includes signal quality information and/or transmit power information of the D2D link.
  • the receiving unit 403 can receive the second feedback information that is sent by the second UE through the D2D link.
  • the signal quality information may include at least one of the following: a reference signal receiving power RSRP, reference signal reception quality RSRQ, received signal strength indication RSSI, channel quality indication CQI, and adjustment information of the CQI.
  • the transmit power information may include adjustment information of a value of transmit power and/or transmit power.
  • the RSRP, the RSRQ, the RSSI, and the CQI may be determined by the second UE according to a DeModulation Reference Signal (DMRS) included in the data packet. That is, the packet includes a DMRS.
  • DMRS DeModulation Reference Signal
  • the signal quality information may be determined by the second UE based on the DMRS in the PD2DSCH, or may be determined based on the D2DSS sent together with the PD2DSCH.
  • the data packet may be one or more of the following: an SA, a data packet corresponding to the data, and a data packet included in the PD2DSCH.
  • the first indication information may be included in the data packet sent by the sending unit 402 to the second UE.
  • the first indication information is used to indicate at least one of: an ID of the first UE, an ID of the second UE, and an ID of the D2D link.
  • the second UE can know who the first UE is, and/or who its target UE is, and/or which of the target D2D links, based on the received data packet from the first UE.
  • the first feedback information may further include a second reference signal, where the second reference signal is determined according to a predefined sequence.
  • the receiving unit 403 may further receive the second reference signal sent by the second UE, where the second reference signal is determined according to a predefined sequence.
  • the sequence may be a pseudo-random sequence, or may be a perfect sequence, or may be a sequence of low-zero correlation regions. This embodiment of the present invention does not limit this.
  • reference may be made to the description of the sequence in the foregoing embodiment of FIG. 3. To avoid repetition, details are not described herein again.
  • the processing unit 401 can perform estimation according to the second reference signal, and obtain channel quality information of the D2D link.
  • processing unit 401 can estimate using a path loss calculation.
  • the processing unit 401 can calculate the transmit power of the second UE by using the difference dP of the transmit power between the second UE and the first UE, and then the first UE estimates the received signal on the sequence sent by the second UE.
  • the first UE can determine whether the current transmit power is suitable; or how much SNR can be obtained under the current transmit power, so that the first UE can select an appropriate transmit according to the path loss. Shooting power or MCS value.
  • the processing unit 401 can estimate using an equivalent signal to interference plus noise ratio (SINR) estimation method.
  • SINR signal to interference plus noise ratio
  • the first UE estimates the equivalent SINR on the sequence sent by the second UE, and then obtains the first UE that can be received by the second UE by using the difference dP between the transmit power of the second UE and the first UE.
  • Equivalent transmit power of the signal: SNRue2 SNR-dP. After the first UE estimates the equivalent transmit power, it can determine whether the transmit power needs to be adjusted and how much to adjust; or whether the MCS needs to be adjusted and how to adjust if the transmit power is not adjusted.
  • the sending unit 402 may send the transmit signal to the second UE according to the transmit resource.
  • the receiving unit 403 may receive the second configuration information that is sent by the serving base station of the first UE, where the second configuration information includes indication information, where the indication information is used to indicate a location of the transmitting resource;
  • the unit 401 determines the transmission resource according to the second configuration information.
  • the serving base station of the first UE can send the second configuration information to the first UE by using signaling.
  • the signaling may be public signaling, such as a System Information Block (SIB).
  • SIB System Information Block
  • RRC radio resource control
  • the signaling may also be dedicated signaling sent to the first UE, such as Downlink Control Information (DCI) signaling.
  • DCI Downlink Control Information
  • the signaling may also be dedicated RRC signaling.
  • the invention is not limited thereto.
  • the receiving unit 403 may obtain the association information and receive the feedback resource sent by the second UE. Further, the processing unit 401 may determine the transmission resource according to the association information and the feedback resource.
  • the association information is used to indicate an association relationship between the transmission resource and the feedback resource, the association information may be predefined, or the association information may be received from a serving base station of the first UE. of.
  • association information may be pre-configured on the first UE, or the serving base station of the first UE may send the association information to the first UE by using signaling.
  • the feedback resource pool can be pre-configured on the second UE, or the serving base station of the second UE can configure the feedback resource pool for the unicast link to the second UE by using signaling. In this way, the second UE can select a transmission resource from the feedback resource pool.
  • the feedback resource pool is a collection of feedback resources.
  • the receiving unit 403 may receive the transmission resource sent by the second UE, where the transmission resource is determined by the second UE according to the feedback resource and the association information, and the association information is used to indicate An association relationship between the transmitting resource and the feedback resource.
  • the feedback resource and the association information may be that the second UE is received from the serving base station of the second UE; or the feedback resource and the association information may be pre-configured on the second UE; or, feedback The resource may be that the second UE is received from a serving base station of the second UE, and the association information is pre-configured on the second UE.
  • the feedback resource pool and associated information can be pre-configured on the second UE.
  • the association information may be pre-configured on the second UE, and the serving base station of the second UE configures a feedback resource pool for the unicast link to the second UE by using signaling.
  • the serving base station of the second UE may configure, by signaling, a feedback resource pool and associated information for the unicast link to the second UE. In this way, the second UE may select a feedback resource from the feedback resource pool, and determine a transmission resource according to the feedback resource and the association information.
  • the transmitting resource is autonomously selected by the first UE from a pool of transmitting resources, wherein the feedback resource pool is pre-configured or the feedback resource pool is a service from the first UE. Received by the base station.
  • the transmission resource pool can be pre-configured on the first UE.
  • the serving base station of the first UE may configure, by using signaling, a transmit resource pool for the unicast link to the first UE.
  • the transmit resource pool is a collection of transmit resources.
  • the receiving unit 403 may obtain the association information, where the association information is used to indicate an association relationship between the transmitting resource and the feedback resource, where the association information is predefined or the associated information is from the Receiving, by the serving base station of the first UE, the processing unit 401 may determine the feedback resource according to the association information and the transmitting resource.
  • the receiving unit 403 can receive the first feedback information sent by the second UE according to the feedback resource.
  • the association information is used to indicate an association relationship between a transmitting resource and a feedback resource.
  • the association relationship may include that an offset value exists between a transmit power included in the feedback resource and a transmit power included in the transmit resource according to a predefined rule.
  • the association relationship may include: the cyclic prefix (Cyclic Prefix, CP) type included in the feedback resource is the same as the CP type included in the transmission resource.
  • the transmit power included in the feedback resource can be understood as being sent by the second UE to the first UE.
  • the transmit power when the first feedback information is sent may be simply referred to as the transmit power fed back by the second UE.
  • the transmit power included in the transmit resource may be understood as the transmit power when the first UE transmits the transmit signal, or may be simply referred to as the transmit power sent by the first UE.
  • the sending unit 402 may send the SA indication information to the second UE, so that the second UE receives the transmission signal according to the SA indication information.
  • the SA indication information includes information about a transmission resource to be used by the first UE, where the transmission resource includes at least one of the following: an MCS, a transmit power, and a time-frequency resource.
  • processing unit 401 may determine, according to the first feedback information received by the receiving unit 403, how to send subsequent data packets.
  • the method for the first UE to send subsequent data packets may be as follows:
  • the processing unit 401 can send the data packet to be sent to the second UE according to the current configuration parameter. That is to say, the first UE still uses the radio link configuration parameter of the last successful transmission to send the next data packet, and the configuration parameters include one or more of the following: MCS, transmit power, retransmission times, resources Quantity.
  • MCS radio link configuration parameter
  • transmit power transmit power
  • retransmission times resources Quantity.
  • processing unit 401 may abort the untransmitted retransmission packet of the transmitted data packet and send the new data packet to be transmitted to the second UE according to the current configuration parameters. If the time at which the first UE receives the first feedback information is earlier than the time at which the next retransmission of the current data packet is sent, the first UE may terminate the transmission of the subsequent retransmission packet and directly start the transmission of the new data packet. At this time, the first UE needs to indicate to the second UE that the new data packet is transmitted instead of the retransmission of the previous data packet.
  • the first UE receives the ACK, it also acknowledges that the signal quality information sent by the second UE is received.
  • the signal quality information may be included in the first feedback information, or may be included in the second feedback information. It should be noted that the time when the first UE receives the ACK and receives the signal quality information is not limited in this embodiment. For example, the signal quality information may be received before or after the ACK is received, or the ACK and signal quality information may be received simultaneously.
  • the processing unit 401 can adjust the configuration parameter according to the signal quality information and/or the transmit power information; and the sending unit 402 sends the data packet to be sent according to the adjusted configuration parameter. To the second UE.
  • the first UE may correspondingly reduce the used transmit power at the time of transmission of the next data packet.
  • the reduced transmit power value may be: a reduced transmit power value obtained according to the signal quality information; or, the transmit power value is decreased according to a predefined step size; or the transmit power value is decreased according to a step configured by the network.
  • the invention is not limited thereto.
  • the reduced transmit power value cannot exceed the lower limit of the allowed transmit power. This lower limit value may be implemented based on the first UE or may be configured by the network through signaling.
  • the first UE transmits the power specified by the lower limit value. In this way, the excess power can be reduced in time, thereby reducing the co-channel interference in the entire network, thereby improving the efficiency of the system.
  • the first UE may use fewer retransmission times, or A subsequent retransmission template corresponding to fewer retransmissions is used to transmit subsequent data packets to be transmitted. In this way, the first UE adjusts the number of retransmissions according to the received signal quality information, thereby improving the spectrum efficiency of the system.
  • the first UE may use a higher MCS level and if the size of the data packet to be transmitted No change, you can use fewer time-frequency resources. In this way, the first UE adjusts the MCS level according to the received signal quality information, or uses less time-frequency resources to transmit subsequent data packets, which can reduce co-channel interference.
  • the processing unit 401 may send the retransmission packet of the transmitted data packet to the second UE according to the current configuration parameter. That is to say, after receiving the NACK, the first UE does not change the current configuration parameters, and continues to try to retransmit the data packet.
  • the first UE receives the NACK, it also acknowledges that the signal quality information sent by the second UE is received.
  • the signal quality information may be included in the first feedback information, or may be included in the second feedback information. It should be noted that the time when the first UE receives the ACK and receives the signal quality information is not limited in this embodiment. For example, the signal quality information may be received before or after the ACK is received, or the ACK and signal quality information may be received simultaneously. Then, the processing unit 401 can adjust the allocation according to the signal quality information and/or the transmit power information. After setting the parameters, send them again.
  • the processing unit 401 may adjust the configuration parameter according to the signal quality information and/or the transmission power information; the sending unit 402 may follow the adjusted configuration.
  • the parameter transmits a retransmission packet of the transmitted data packet to the second UE.
  • the processing unit 401 may increase the number of retransmissions of the transmitted data packet or change the retransmission pattern, and the transmitting unit 402 transmits the transmitted packet.
  • a retransmission packet of the data packet is sent to the second UE.
  • the first UE can successfully transmit the data packet by increasing the number of retransmissions or changing the retransmission pattern. There is no need to change other configuration parameters such as transmit power.
  • a larger number of retransmissions or a modified retransmission pattern may be used for subsequent new data packets.
  • the processing unit 401 may adjust the configuration parameter according to the signal quality information, and perform subsequent transmission according to the adjusted configuration parameter.
  • a retransmission of the transmitted data packet with the number of retransmissions of 2 may be directly sent.
  • IR Incremental Redundancy
  • the first UE may increase the use of the subsequent new data packet. Transmit power.
  • the increased transmit power value may be: an increased power value obtained according to the signal quality information; or, the transmit power value is increased by a predefined step size; or by network The configured step size is used to increase the transmit power value.
  • the increased transmit power cannot exceed the upper limit of the allowed transmit power.
  • This upper limit value may be implemented based on the first UE or may be configured by the network through signaling. When the increased transmit power is higher than the upper limit value, the first UE transmits the new data packet by using the power specified by the upper limit value as the transmit power.
  • the first UE can increase the transmission power under the allowed conditions without adding additional spectrum resources, thereby improving the efficiency of the system.
  • the first UE may use a lower MCS level, and if subsequently The size of the new packet does not change, so you need to use more time-frequency resources to send. At this time, it is not suitable to increase the number of retransmissions or increase the transmission power. Only by lowering the MCS level, a lower equivalent code rate is used to improve the stability of the link. That is, the first UE can use a lower MCS level to transmit subsequent new data packets.
  • the first UE can ensure successful transmission of subsequent data packets according to the first feedback information or according to the first feedback information and the second feedback information, thereby improving the spectrum efficiency of the system.
  • the second UE may send the generated second feedback information to the serving base station of the second UE. If the first UE and the second UE are located in the same cell, the serving base station of the second UE and the serving base station of the first UE are the same base station. If the first UE and the second UE are located in different cells, the serving base station of the second UE may send the second feedback information to the serving base station of the first UE by signaling between the base stations.
  • the serving base station of the first UE may schedule and configure resources of the D2D link according to the second feedback information and the communication status of the entire network.
  • the receiving unit 403 can also receive the first configuration information that is sent by the serving base station of the first UE, where the first configuration information includes at least one of the following: retransmission times or retransmission pattern configuration information. And the adjustment information of the transmit power or the transmit power, the information of the used MCS, and the indication information of the time-frequency resource used, and the first configuration information is sent by the serving base station of the first UE according to the second UE.
  • the second feedback information is determined by the processing unit 401, and the processing parameter is adjusted according to the first configuration information, and the data packet to be sent is sent to the second UE according to the adjusted configuration parameter.
  • the first configuration information may further include a letter for indicating an ID of the D2D link. interest.
  • the processing unit 401 can adjust the configuration parameter according to the first configuration information sent by the serving base station of the first UE, and can avoid the impact on the other UEs and other links caused by the first UE self-adjustment.
  • the manner in which the processing unit 401 sends subsequent data packets according to the first configuration information may be as follows:
  • the first UE receives the first configuration information sent by the serving base station of the first UE, all the data packets buffered in the sending buffer of the first UE are not completely transmitted.
  • the processing unit 401 can use the previously adopted configuration parameters to complete the retransmission of the current data packet. Then, the first UE adjusts the configuration parameter according to the first configuration information, and sends the subsequent retransmission packet or the subsequent new data packet by using the adjusted configuration parameter.
  • the processing unit 401 may adjust the configuration parameter according to the first configuration information, and adopt the adjusted The configuration parameter sends a retransmission packet for the currently unsuccessfully transmitted packet.
  • the configuration parameter may include at least one of the following: an MCS level, a number of retransmissions, retransmission pattern information, transmission power information, and indication information of a time-frequency resource.
  • FIG. 5 is a structural block diagram of a base station according to an embodiment of the present invention.
  • the base station 500 shown in FIG. 5 includes a receiving unit 501, a processing unit 502, and a transmitting unit 503.
  • the receiving unit 501 is configured to receive feedback information sent by the second UE, where the feedback information includes signal quality information and/or transmit power information of a D2D link between the first UE and the second UE.
  • the processing unit 502 is configured to generate first configuration information according to the feedback information received by the receiving unit 501.
  • the sending unit 503 is configured to send the first configuration information generated by the processing unit 502 to the first UE, where the base station is a serving base station of the first UE.
  • the base station generates the first configuration information according to the feedback information received from the second UE, and sends the first configuration information to the first UE, so that the first UE can adjust the configuration parameter according to the first configuration information. In this way, not only the correct transmission of data on the D2D link between the first UE and the second UE but also the transmission of links of other UEs can be guaranteed.
  • the base station 500 is also The serving base station of the second UE. If the first UE and the second UE are located in different cells, the serving base station of the second UE is different from the base station 500. Then, the receiving unit 501 is specifically configured to receive the feedback information sent by the second UE from the serving base station of the second UE.
  • the receiving unit 501 receives the feedback information from the serving base station of the second UE by signaling between the base stations, and the feedback information is sent by the second UE to the second UE. Serving base station.
  • the feedback information received by the receiving unit 501 includes signal quality information and/or transmit power information of a D2D link between the first UE and the second UE.
  • the feedback information may further include indication information, where the indication information is used to indicate at least one of: an ID of the first UE, an ID of the second UE, and an ID of the D2D link. .
  • base station 500 can know which D2D link the signal quality information and/or transmit power information in the feedback information is for.
  • the ID of the first UE may be an International Mobile Subscriber Identification Number (IMSI) number of the first UE, or may be a network temporary identifier of the first UE.
  • the ID of the second UE may be the MISI number of the second UE, or may be the network temporary identifier of the second UE.
  • the ID of the D2D link may be a Radio Network Temporary Identity (RNTI) of the D2D link, that is, a D2D-RNTI.
  • RNTI Radio Network Temporary Identity
  • the first configuration information generated by the processing unit 502 may include at least one of the following: retransmission times or retransmission pattern configuration information, transmission power or transmission power adjustment information, and information of a modulation coding mode MCS used. And instructions for using time-frequency resources.
  • the first configuration information may further include information for indicating an ID of the D2D link.
  • the sending unit 503 sends the first configuration information to the first UE through a cellular link.
  • the sending unit 503 is further configured to send the second configuration information to the first UE.
  • the second configuration information includes a transmission resource pool and/or association information for the D2D link, where the association information is used to indicate an association relationship between the transmission resource and the feedback resource.
  • the first UE may send a data packet to the second UE according to the second configuration information.
  • the sending unit 503 is further configured to send third configuration information to the second UE, where the third configuration information includes a feedback resource pool and/or associated information for the D2D link, the association The information is used to indicate an association relationship between the transmitting resource and the feedback resource.
  • the sending unit 503 may only send the second configuration information to the first UE; or the sending unit 503 may only send the third configuration information to the second UE; or The sending unit 503 sends the second configuration information to the first UE and the third configuration information to the second UE.
  • FIG. 6 is a structural block diagram of a base station according to another embodiment of the present invention.
  • the base station 600 shown in FIG. 6 is a second base station, and includes a receiving unit 601 and a transmitting unit 602.
  • the receiving unit 601 is configured to receive feedback information sent by the second UE, where the feedback information includes signal quality information and/or transmit power information of a D2D link between the first UE and the second UE, where The second base station is a serving base station of the second UE.
  • the sending unit 602 is configured to send the feedback information to the first base station, where the first base station is a serving base station of the first UE, and the first UE and the second UE are located in different cells.
  • the serving base station of the second UE when the first UE and the second UE are located in different cells, the serving base station of the second UE sends the feedback information received from the second UE to the serving base station of the first UE, which can enable the first UE.
  • the serving base station obtains feedback information about the D2D link.
  • the signal quality information includes at least one of: reference signal received power RSRP, reference signal received quality RSRQ, received signal strength indicator RSSI, channel quality indicator CQI, and adjustment information of the CQI;
  • the transmission power information includes adjustment values of the value of the transmission power and/or transmission power.
  • the sending unit 602 can send the feedback information to the first base station by signaling between the base stations.
  • the feedback information further includes indication information, where the indication information is used to indicate at least one of: an ID of the first UE, an ID of the second UE, and the D2D link. ID.
  • the ID of the first UE may be an International Mobile Subscriber Identification Number (IMSI) number of the first UE, or may be a network temporary identifier of the first UE.
  • the ID of the second UE may be the MISI of the second UE.
  • the number may be a network temporary identifier of the second UE.
  • the ID of the D2D link may be a Radio Network Temporary Identity (RNTI) of the D2D link, that is, a D2D-RNTI.
  • RNTI Radio Network Temporary Identity
  • the sending unit 602 is further configured to send configuration information to the second UE.
  • the configuration information includes a feedback resource pool and/or association information, where the association information is used to indicate an association relationship between the transmission resource and the feedback resource.
  • FIG. 7 is a flow chart of a method of D2D communication in accordance with an embodiment of the present invention.
  • the method shown in Figure 7 includes:
  • the second UE receives a transmit signal sent by the first UE, where the transmit signal is transmitted by using a D2D link between the first UE and the second UE.
  • the second UE generates first feedback information according to the transmit signal.
  • the second UE sends the first feedback information to the first UE.
  • the second UE after receiving the transmission signal sent by the first UE through the D2D link, the second UE that is the receiver generates the first feedback information, and sends the first feedback information to the first UE.
  • the first UE can be made to acquire the reception quality of the second UE, so that the QoS of the D2D communication can be guaranteed.
  • the second UE sends the first feedback information to the first UE by using the D2D link.
  • the transmit signal in 701 can be a first reference signal, and the first reference signal is used to perform quality measurements on the D2D link. Then, the first feedback information in 702 may include signal quality information and/or transmit power information of the D2D link.
  • the first reference signal may be a D2D Synchronization Signal (D2DSS).
  • D2DSS D2D Synchronization Signal
  • the first reference signal may also be a newly defined reference signal dedicated to performing D2D channel quality measurement. The invention is not limited thereto.
  • the second UE may estimate the signal quality of the D2D link from the transmitted signal and generate signal quality information.
  • the signal quality information may include at least one of: Reference Signal Received Power (RSRP), and reference signal reception quality (Reference) Signal Received Quality (RSRQ), Received Signal Strength Indication (RSSI), Channel Quality Indicator (CQI), and adjustment information of the CQI.
  • the transmit power information may include adjustment information of a value of transmit power and/or transmit power.
  • the second UE can pre-store all supported antenna configurations and various Signal to Noise Ratio (SNR) that can be correctly demodulated under various Modulation and Coding Scheme (MCS) levels. Threshold.
  • SNR Signal to Noise Ratio
  • MCS Modulation and Coding Scheme
  • CQI channel quality indicator
  • the second UE may calculate a current equivalent SNR value according to the transmitted signal. And, the second UE may determine a corresponding equivalent SNR threshold from the foregoing Table 1 according to the transmit signal.
  • the second UE may calculate the CQI, the CQI adjustment information ⁇ CQI, and the transmit power adjustment information ⁇ P according to the equivalent SNR and the equivalent SNR threshold. In this way, the second UE can generate first feedback information at 702.
  • the current equivalent SNR value calculated by the second UE according to the transmitted signal is 4.01 dB.
  • the equivalent SNR threshold corresponding to the MCS actually used by the first UE is 0.71 dB
  • the second UE may generate the first feedback information in other manners, which is not limited by the present invention.
  • an MCS is mainly allocated to a transmitter (ie, a first UE), and the MCS is used to indicate information such as a modulation order, an index of a transport block size used for transmission, and a retransmission version.
  • the MCS is indicated using 5 bits. Together with the allocated bandwidth and the configured spatial layer parameters, the MCS can get the actual size of the transport block by looking up the table. Since the MCS implicitly gives the size of the transport block, it is equivalent to the code rate of the data to be transmitted (ie, the third column of Table 1).
  • the CQI is used to indicate the modulation order, the code rate, and the spectral efficiency of the corresponding transmission.
  • the CQI is mainly used for the receiver (ie, the second UE) to implement feedback on the channel quality, and the CQI can be used to characterize the quality of the equivalent channel seen by the current receiver, that is, the spectral efficiency that can be supported.
  • the CQI indicates a subset of all supported MCS in the LTE system.
  • the first UE may acquire channel quality information of the D2D link between the first UE and the second UE. Further, the first UE may adjust the configuration parameter according to the first feedback information, and the first UE may send the data packet to the second UE.
  • the second UE may also send the first feedback information to the serving base station of the second UE by using the cellular link, so that the serving base station of the second UE acquires channel quality information of the D2D link.
  • the second UE may send the first feedback information to the first UE according to the feedback resource.
  • the second UE may receive configuration information sent by the serving base station of the second UE, where the configuration information includes second indication information, where the second indication information is used to indicate the feedback resource. a location of the second UE that determines the feedback resource according to the configuration information.
  • the serving base station of the second UE can send configuration information to the second UE by using signaling.
  • the signaling may be public signaling, such as a System Information Block (SIB).
  • SIB System Information Block
  • RRC radio resource control
  • the signaling may also be dedicated signaling sent to the second UE, such as Downlink Control Information (DCI) signaling.
  • DCI Downlink Control Information
  • the signaling may also be dedicated RRC signaling.
  • the invention is not limited thereto.
  • the second UE may acquire the association information, and receive the transmission resource sent by the first UE. Further, the second UE may determine, according to the association information and the transmission resource, The feedback resource.
  • the association information is used to indicate an association relationship between the transmission resource and the feedback resource, the association information may be predefined, or the association information may be received from a serving base station of the second UE. of.
  • the first UE may send the transmission resource to the second UE through the SA control channel, or through a physical D2D Synchronization Channel, or through a data channel.
  • the first UE may send the transmission resource to the second UE by sending SA indication information.
  • association information can be pre-configured on the second UE, or the serving base station of the second UE can send the association information to the second UE by using signaling.
  • the transmission resource pool can be pre-configured on the first UE, or the serving base station of the first UE can configure the transmission resource pool for the unicast link to the first UE by using signaling. In this way, the first UE can select a transmission resource from the pool of transmission resources.
  • the transmit resource pool is a collection of transmit resources.
  • the second UE may calculate the feedback resource according to the transmission resource and the association information.
  • the second UE may calculate the frequency domain location included in the feedback resource by (a*Nprb+b) mod Nm.
  • Nprb is the location of the transmission resource in the frequency domain
  • Nm is the maximum number of feedback resources provided
  • mod represents the modulo operation.
  • the second UE may calculate the location of the radio frame or subframe occupied in the time domain included in the feedback resource. It may be a time domain location of a D2D feedback resource that is closest to the time after receiving the transmission resource and greater than a certain time threshold (eg, 4 ms). For example, in the third subframe of the current radio frame, the currently transmitted data packet is received, and the nearest subframe 6 and the subframe 8 have feedback resources, but the interval between the subframe 6 and the subframe 3 is smaller than The threshold is 4ms, so sub-frame 8 is selected.
  • the time domain location as a feedback resource.
  • the second UE may receive the feedback resource sent by the first UE.
  • the feedback resource is determined by the first UE according to the transmission resource and the association information, and the association information is used to indicate an association relationship between the transmission resource and the feedback resource.
  • the transmitting resource and the association information may be that the first UE is received from a serving base station of the first UE; or, the transmitting resource and the association information may be pre-configured on the first UE; or, transmitting The resource may be that the first UE is received from a serving base station of the first UE, and the association information is pre-configured on the first UE.
  • the transmit resource pool and associated information can be pre-configured on the first UE.
  • the association information may be pre-configured on the first UE, and the serving base station of the first UE configures, by using signaling, a transmission resource pool for the unicast link to the first UE.
  • the serving base station of the first UE may configure, by using signaling, a transmit resource pool and associated information for the unicast link to the first UE. In this way, the first UE may select a transmission resource from the transmission resource pool, and determine a feedback resource according to the transmission resource and the association information.
  • the feedback resource may be autonomously selected by the second UE from a pool of feedback resources, where the feedback resource pool is pre-configured or the feedback resource pool is from the second UE. Received by the serving base station.
  • the feedback resource pool can be pre-configured on the second UE.
  • the serving base station of the second UE may configure a feedback resource pool for the unicast link to the second UE by using signaling.
  • the feedback resource pool is a collection of feedback resources.
  • the association information is used to indicate an association relationship between a transmitting resource and a feedback resource.
  • the association relationship may include that an offset value exists between a transmit power included in the feedback resource and a transmit power included in the transmit resource according to a predefined rule.
  • the association relationship may include: the cyclic prefix (Cyclic Prefix, CP) type included in the feedback resource is the same as the CP type included in the transmission resource.
  • the transmit power included in the feedback resource may be understood as the transmit power when the second UE sends the first feedback information to the first UE, or may be simply referred to as the transmit power fed back by the second UE.
  • the transmit power included in the transmit resource may be understood as the transmit power when the first UE transmits the transmit signal, or may be simply referred to as the transmit power sent by the first UE.
  • the transmit power when the second UE feeds back is sent by the first UE.
  • the transmit power of the second UE is different from the transmit power of the first UE, and may be expressed as the transmit power when the second UE feeds back, and the transmit power when the first UE is sent is equal to the difference.
  • the difference may be a fixed value, for example, the difference is equal to 3 dB or -3 dB.
  • the difference can be calculated from other available parameters.
  • the difference may be related to the MCS level; that is, the difference may be determined according to the MCS level when the second UE feeds back and the MCS level when the first UE transmits. The invention is not limited thereto.
  • the transmit signal in 701 can be a data packet.
  • the first feedback information in 702 may include response information after the second UE demodulates the data packet.
  • the response information is demodulation correct acknowledgement information (ACK) or negative acknowledgement information (Negative Acknowledgement (NACK).
  • the second UE may demodulate the data packet and determine whether the demodulation is correct by decoding. If the demodulation is correct, the response message is ACK; if the demodulation is incorrect, the response message is NACK.
  • the first feedback information may further include signal quality information and/or transmit power information of the D2D link.
  • the second UE after the 701, the second UE generates second feedback information according to the demodulated result, and sends the second feedback information to the first UE and/or the second The serving base station of the UE.
  • the second feedback information includes signal quality information and/or transmit power information of the D2D link.
  • the second UE may send the second feedback information to the first UE by using the D2D link, and may send the second feedback information to the serving base station of the second UE by using the cellular link.
  • the second UE may estimate the signal quality of the D2D link according to the transmitted signal, and generate signal quality information.
  • the signal quality information may include at least one of the following: a reference signal received power RSRP, a reference signal received quality RSRQ, a received signal strength indicator RSSI, a channel quality indicator CQI, and adjustment information of the CQI.
  • the transmit power information may include adjustment information of a value of transmit power and/or transmit power.
  • the RSRP, the RSRQ, the RSSI, and the CQI may be determined by the second UE according to a DeModulation Reference Signal (DMRS) included in the data packet. That is, the packet includes a DMRS.
  • DMRS DeModulation Reference Signal
  • the signal quality information may be determined based on the DMRS in the PD2DSCH, or may be based on a D2D synchronization signal (D2D Synchronization Signal) sent together with the PD2DSCH. D2DSS) determined.
  • the data packet may be one or more of the following: an SA, a data packet corresponding to the data, and a data packet included in the PD2DSCH.
  • the first indication information may be included in the data packet sent by the first UE to the second UE.
  • the first indication information is used to indicate at least one of: an ID of the first UE, an ID of the second UE, and an ID of the D2D link.
  • the second UE can know who the first UE is, and/or who its target UE is, and/or which of the target D2D links, based on the received data packet from the first UE.
  • the second UE may send the second feedback information to the serving base station of the second UE, where the second feedback information may further include the first indication information.
  • the first indication information is used to indicate at least one of: an ID of the first UE, an ID of the second UE, and an ID of the D2D link.
  • the serving base station of the second UE can know which D2D link the signal quality information and/or the transmission power information in the second feedback information is for.
  • the ID of the first UE may be an International Mobile Subscriber Identification Number (IMSI) number of the first UE, or may be a network temporary identifier of the first UE.
  • the ID of the second UE may be the MISI number of the second UE, or may be the network temporary identifier of the second UE.
  • the ID of the D2D link may be a Radio Network Temporary Identity (RNTI) of the D2D link, that is, a D2D-RNTI.
  • RNTI Radio Network Temporary Identity
  • the order of sending time of the first feedback information and the second feedback information is not limited.
  • the second UE may simultaneously send the first feedback information and the second feedback information to the first UE.
  • the second UE may also send the first feedback information to the first UE, so that the first UE determines whether the last data transmission is correct in a short time; and then sends the second feedback information to the first UE. .
  • the second UE may simultaneously send the first feedback information and the second feedback information to the first UE, and send the second feedback information to the serving base station of the second UE.
  • the second UE may first send the first feedback information to the first UE, and then send the second feedback information to the serving base station of the first UE and the second UE at the same time.
  • the second UE may first send the first feedback information and the second feedback information to the first UE, and then send the second feedback information to the serving base station of the second UE. This embodiment of the present invention does not limit this.
  • the second UE may send the first feedback information to the first UE while transmitting the second feedback information to the serving base station of the second UE.
  • the second UE may first send the first feedback information to the first UE, and then send the second feedback information to the serving base station of the second UE.
  • the first UE can determine whether the last data transmission is correct in a short time to determine whether retransmission of the transmitted data packet is required. This ensures the delay of the D2D link.
  • the second UE sends the first feedback information to the first UE in time through the D2D link, at least ensuring the operation of the D2D link.
  • the first UE is not sufficient to overcome this loss after receiving the first feedback information.
  • the first UE changes the transmission power according to its own needs, it may have an unnecessary negative impact on other links, and how much the transmission power is changed, and should not be completely determined by the first UE.
  • the size of the data packet to be transmitted is fixed, if the MCS level is lowered, it means that more time-frequency resources need to be used.
  • the network When the network allocates time-frequency resources to the D2D link, it fully considers the communication requirements of other cellular links and other D2D links. At this time, if the first UE arbitrarily expands the time-frequency resources used by itself, it is likely to occupy resources allocated to other UEs, thereby not only improving the reliability of the D2D link, but also other UEs in the occupied resources. Inter-frequency interference is generated, causing the performance of the first UE and other UEs to decrease. Therefore, when the first UE needs to adjust the MCS, the transmit power, and the time-frequency resource, the serving base station of the first UE performs appropriate configuration for the first UE according to the obtained second feedback information and scheduling information of other users. The entire system works effectively.
  • the serving base station of the first UE and the serving base station of the second UE are the same base station. If the first UE and the second UE are located in different cells, the serving base station of the second UE needs to send the second feedback information received from the second UE to the serving base station of the first UE by using signaling between the base stations, to The serving base station of the first UE is caused to schedule and configure the D2D link.
  • the method further includes: receiving, by the second UE, a scheduling sent by the first UE Scheduling Assignment (SA) indication information.
  • SA indication information includes information about a transmission resource to be used by the first UE, where the transmission resource includes at least one of the following: an MCS, a transmit power, and a time-frequency resource.
  • the second UE may receive the transmit signal sent by the first UE according to the SA indication information.
  • the signal sent by the first UE may include the SA indication information 801 and the transmission signal 802 as shown in FIG.
  • the SA indication information 801 is sent before the transmission signal 802, and the transmission signal 802 is a data packet.
  • the SA indication information 801 is used to indicate the MCS, the transmit power, and the time-frequency resource used to transmit the transmit signal 802, and the information may also be included in the data packet of the SA.
  • the second UE first receives the SA indication information 801, and receives the subsequent transmission signal 802 according to the SA indication information 801.
  • the second UE may generate a second reference signal according to the received transmit signal, and in 703, send the second reference signal to the first UE.
  • the first feedback information generated by the second UE includes a second reference signal.
  • the second reference signal is determined according to a predefined sequence.
  • the second reference signal may also be referred to as a sequence reference signal.
  • the first UE may perform estimation according to the received second reference signal and obtain channel quality information of the D2D link.
  • the second reference signal is generated by placing the sequence on the corresponding time-frequency resource.
  • the sequence may be a pseudo-random sequence, or may be a perfect sequence, or may be a sequence of low-zero correlation regions. This embodiment of the present invention does not limit this.
  • the sequence may be an m-sequence or a Gold sequence, or may be a ZC (Zadoff-Chu) sequence, or may be a sequence of a DeModulation Reference Signal (DMRS) used in LTE uplink.
  • DMRS DeModulation Reference Signal
  • the sequence used by the DMRS can be generated by a predefined sequence and a ZC sequence.
  • sequence of the DMRS corresponding to the cyclic shift can be further generated as follows:
  • the parameters to be confirmed may be determined according to the SA indication information received from the first UE. For example, if the SA includes an 8-bit ID, then the second UE can use all or part of the 8-bit to calculate the root sequence number q or the cyclic shift value ⁇ of the sequence.
  • the method of calculation can be performed by a predefined formula.
  • the cyclic shift value ⁇ may be indicated by a number of bits of the ID in the SA (such as some 3 bits therein); the value of the OCC may also be indicated by a number of bits of the ID in the SA (such as one of the bits); the root sequence number q of the sequence is indicated by a number of bits of the ID in the SA.
  • the second UE may send the first feedback information to the first UE according to the feedback resource.
  • the second UE may receive configuration information sent by the serving base station of the second UE, where the configuration information includes second indication information, where the second indication information is used to indicate the feedback resource. a location of the second UE that determines the feedback resource according to the configuration information.
  • the serving base station of the second UE can send configuration information to the second UE by using signaling.
  • the signaling may be public signaling, such as a System Information Block (SIB).
  • SIB System Information Block
  • RRC radio resource control
  • the signaling may also be dedicated signaling sent to the second UE, such as Downlink Control Information (DCI) signaling.
  • DCI Downlink Control Information
  • the signaling can also be dedicated RRC signaling.
  • the invention is not limited thereto.
  • the second UE may acquire the association information, and receive the transmission resource sent by the first UE. Further, the second UE may determine, according to the association information and the transmission resource, The feedback resource.
  • the association information is used to indicate an association relationship between the transmission resource and the feedback resource, the association information may be predefined, or the association information may be received from a serving base station of the second UE. of.
  • the first UE may send the transmission resource to the second UE through the SA control channel, or through a Physical D2D Synchronization Channel (PD2DSCH), or through a data channel.
  • the first UE may send the transmission resource to the second UE by sending SA indication information.
  • association information can be pre-configured on the second UE, or the serving base station of the second UE can send the association information to the second UE by using signaling.
  • the transmission resource pool can be pre-configured on the first UE, or the serving base station of the first UE can configure the transmission resource pool for the unicast link to the first UE by using signaling. In this way, the first UE can select a transmission resource from the pool of transmission resources.
  • the transmit resource pool is a collection of transmit resources.
  • the second UE may calculate the feedback resource according to the transmission resource and the association information.
  • the second UE may calculate the frequency domain location included in the feedback resource by (a*Nprb+b) mod Nm.
  • Nprb is the location of the transmission resource in the frequency domain
  • Nm is the maximum number of feedback resources provided
  • mod represents the modulo operation.
  • the second UE may calculate the location of the radio frame or subframe occupied in the time domain included in the feedback resource. It may be a time domain location of a D2D feedback resource that is closest to the time after receiving the transmission resource and greater than a certain time threshold (eg, 4 ms). For example, in the third subframe of the current radio frame, the currently transmitted data packet is received, and the nearest subframe 6 and the subframe 8 have feedback resources, but the interval between the subframe 6 and the subframe 3 is smaller than The threshold is 4ms, so subframe 8 is selected as the time domain location of the feedback resource.
  • a certain time threshold eg, 4 ms
  • the second UE may receive the feedback resource sent by the first UE.
  • the feedback resource is determined by the first UE according to the transmission resource and the association information, and the association information is used to indicate an association relationship between the transmission resource and the feedback resource.
  • the transmission resource and the association information may be that the first UE is from the first UE Received by the serving base station; or, the transmission resource and the association information may be pre-configured on the first UE; or the transmission resource may be received by the first UE from the serving base station of the first UE, and The association information is pre-configured on the first UE.
  • the transmit resource pool and associated information can be pre-configured on the first UE.
  • the association information may be pre-configured on the first UE, and the serving base station of the first UE configures, by using signaling, a transmission resource pool for the unicast link to the first UE.
  • the serving base station of the first UE may configure, by using signaling, a transmit resource pool and associated information for the unicast link to the first UE. In this way, the first UE may select a transmission resource from the transmission resource pool, and determine a feedback resource according to the transmission resource and the association information.
  • the feedback resource may be autonomously selected by the second UE from a pool of feedback resources, where the feedback resource pool is pre-configured or the feedback resource pool is from the second UE. Received by the serving base station.
  • the feedback resource pool can be pre-configured on the second UE.
  • the serving base station of the second UE may configure a feedback resource pool for the unicast link to the second UE by using signaling.
  • the feedback resource pool is a collection of feedback resources.
  • the association information is used to indicate an association relationship between a transmitting resource and a feedback resource.
  • the association relationship may include that an offset value exists between a transmit power included in the feedback resource and a transmit power included in the transmit resource according to a predefined rule.
  • the association relationship may include: the cyclic prefix (Cyclic Prefix, CP) type included in the feedback resource is the same as the CP type included in the transmission resource.
  • the transmit power included in the feedback resource may be understood as the transmit power when the second UE sends the first feedback information to the first UE, or may be simply referred to as the transmit power fed back by the second UE.
  • the transmit power included in the transmit resource may be understood as the transmit power when the first UE transmits the transmit signal, or may be simply referred to as the transmit power sent by the first UE.
  • the transmit power of the second UE is different from the transmit power of the first UE, and may be expressed as the transmit power when the second UE feeds back, and the transmit power when the first UE is sent is equal to the difference.
  • the difference may be a fixed value, for example, the difference is equal to 3 dB or -3 dB.
  • the difference can be calculated from other available parameters.
  • the difference may be related to the MCS level; that is, the difference may be based on the MCS level when the second UE feeds back and when the first UE transmits The MCS rating is determined. The invention is not limited thereto.
  • the embodiment of the present invention associates the feedback resource with the transmission resource by using the association information, which can reduce the signaling overhead.
  • the serving base station of the first UE and the serving base station of the second UE are the same base station. If the first UE and the second UE are located in different cells, the serving base station of the first UE and the serving base station of the second UE are two different base stations, and between the serving base station of the first UE and the serving base station of the second UE Communication can be performed by signaling between base stations.
  • FIG. 7 may be performed by the user device 300 illustrated in the embodiment of FIG. 3 above.
  • FIG. 9 is a flow chart of a method of D2D communication in accordance with another embodiment of the present invention.
  • the method shown in Figure 9 includes:
  • the first UE generates a transmit signal.
  • the first UE sends the transmit signal to a second UE, where the transmit signal is transmitted by using a D2D link between the first UE and the second UE.
  • the first UE receives the first feedback information sent by the second UE.
  • the first UE after transmitting the transmit signal to the second UE, the first UE can receive the first feedback information of the second UE. Thereby, the reception quality of the second UE can be acquired, so that the QoS of the D2D communication can be guaranteed.
  • the first UE receives the first feedback information that is sent by the second UE by using the D2D link.
  • the transmit signal in 901 can be a first reference signal, and the first reference signal is used to perform quality measurements on the D2D link. Then, the first feedback information in 903 may include signal quality information and/or transmission power information of the D2D link.
  • the first reference signal may be a D2D Synchronization Signal (D2DSS).
  • D2DSS D2D Synchronization Signal
  • the first reference signal may also be a newly defined reference signal dedicated to performing D2D channel quality measurement. The invention is not limited thereto.
  • the signal quality information may include at least one of the following: a reference signal received power RSRP, a reference signal received quality RSRQ, a received signal strength indicator RSSI, and a channel quality indicator. CQI and adjustment information of the CQI.
  • the transmit power information may include adjustment information of a value of transmit power and/or transmit power.
  • the first UE may acquire channel quality information of the D2D link between the first UE and the second UE according to the first feedback information. Further, the first UE may adjust the configuration parameter according to the first feedback information, and the first UE may send the data packet to the second UE.
  • the first UE may send the transmit signal to the second UE according to the transmit resource.
  • the first UE may receive the second configuration information that is sent by the serving base station of the first UE, where the second configuration information includes indication information, where the indication information is used to indicate the a location of the transmitting resource; the first UE determining the transmitting resource according to the second configuration information.
  • the serving base station of the first UE can send the second configuration information to the first UE by using signaling.
  • the signaling may be public signaling, such as a System Information Block (SIB).
  • SIB System Information Block
  • RRC radio resource control
  • the signaling may also be dedicated signaling sent to the first UE, such as Downlink Control Information (DCI) signaling.
  • DCI Downlink Control Information
  • the signaling may also be dedicated RRC signaling.
  • the invention is not limited thereto.
  • the first UE may acquire the association information, and receive the feedback resource sent by the second UE. Further, the first UE may determine, according to the association information and the feedback resource, The transmitting resource.
  • the association information is used to indicate an association relationship between the transmission resource and the feedback resource, the association information may be predefined, or the association information may be received from a serving base station of the first UE. of.
  • association information may be pre-configured on the first UE, or the serving base station of the first UE may send the association information to the first UE by using signaling.
  • the feedback resource pool can be pre-configured on the second UE, or the serving base station of the second UE can configure the feedback resource pool for the unicast link to the second UE by using signaling. In this way, the second UE can select a transmission resource from the feedback resource pool.
  • the feedback resource pool is a collection of feedback resources.
  • the first UE may receive the transmission resource sent by the second UE, where the transmission resource is determined by the second UE according to the feedback resource and the association information, where The association information is used to indicate a relationship between the transmitting resource and the feedback resource Linkage.
  • the feedback resource and the association information may be that the second UE is received from the serving base station of the second UE; or the feedback resource and the association information may be pre-configured on the second UE; or, feedback The resource may be that the second UE is received from a serving base station of the second UE, and the association information is pre-configured on the second UE.
  • the feedback resource pool and associated information can be pre-configured on the second UE.
  • the association information may be pre-configured on the second UE, and the serving base station of the second UE configures a feedback resource pool for the unicast link to the second UE by using signaling.
  • the serving base station of the second UE may configure, by signaling, a feedback resource pool and associated information for the unicast link to the second UE. In this way, the second UE may select a feedback resource from the feedback resource pool, and determine a transmission resource according to the feedback resource and the association information.
  • the transmitting resource is autonomously selected by the first UE from a pool of transmitting resources, wherein the feedback resource pool is pre-configured or the feedback resource pool is a service from the first UE. Received by the base station.
  • a pool of transmit resources can be pre-configured on the first UE.
  • the serving base station of the first UE may configure, by using signaling, a transmit resource pool for the unicast link to the first UE.
  • the transmit resource pool is a collection of transmit resources.
  • the method may further include: the first UE may acquire association information, where the association information is used to indicate an association relationship between the transmission resource and a feedback resource, where the association information is The defined or the association information is received from a serving base station of the first UE; the first UE determines a feedback resource according to the association information and the transmission resource.
  • the first UE may receive the first feedback information sent by the second UE according to the feedback resource.
  • the association information is used to indicate an association relationship between a transmitting resource and a feedback resource.
  • the association relationship may include that an offset value exists between a transmit power included in the feedback resource and a transmit power included in the transmit resource according to a predefined rule.
  • the association relationship may include: the cyclic prefix (Cyclic Prefix, CP) type included in the feedback resource is the same as the CP type included in the transmission resource.
  • the transmit power included in the feedback resource may be understood as the transmit power when the second UE sends the first feedback information to the first UE, or may be simply referred to as the transmit power fed back by the second UE.
  • the transmit power included in the transmit resource can be understood as the transmit power when the first UE transmits the transmit signal.
  • the rate may be simply referred to as the transmit power transmitted by the first UE.
  • the serving base station of the first UE and the serving base station of the second UE are the same base station. If the first UE and the second UE are located in different cells, the serving base station of the first UE and the serving base station of the second UE are two different base stations, and between the serving base station of the first UE and the serving base station of the second UE Communication can be performed by signaling between base stations.
  • the transmission information in 901 can be a data packet.
  • the first feedback information in 903 may include response information after the second UE demodulates the data packet.
  • the response information is demodulation correct acknowledgement information (ACK) or negative acknowledgement information (Negative Acknowledgement (NACK).
  • the first feedback information may further include signal quality information and/or transmit power information of the D2D link.
  • the method further includes: the first UE receiving second feedback information sent by the second UE, where the second feedback information includes signal quality information of the D2D link And/or transmit power information.
  • the first UE can receive the second feedback information that is sent by the second UE through the D2D link.
  • the signal quality information may include at least one of the following: a reference signal received power RSRP, a reference signal received quality RSRQ, a received signal strength indicator RSSI, a channel quality indicator CQI, and adjustment information of the CQI.
  • the transmit power information may include adjustment information of a value of transmit power and/or transmit power.
  • the RSRP, the RSRQ, the RSSI, and the CQI may be determined by the second UE according to a DeModulation Reference Signal (DMRS) included in the data packet. That is, the packet includes a DMRS.
  • DMRS DeModulation Reference Signal
  • the signal quality information may be determined by the second UE based on the DMRS in the PD2DSCH, or may be determined based on the D2DSS sent together with the PD2DSCH.
  • the data packet may be one or more of the following: an SA, a data packet corresponding to the data, and a data packet included in the PD2DSCH.
  • the first indication information may be included in the data packet sent by the first UE to the second UE.
  • the first indication information is used to indicate at least one of the following: an ID and a location of the first UE.
  • the ID of the second UE and the ID of the D2D link are used to indicate at least one of the following: an ID and a location of the first UE.
  • the ID of the second UE and the ID of the D2D link are used to indicate at least one of the following: an ID and a location of the first UE.
  • the ID of the second UE and the ID of the D2D link In this way, the second UE can know who the first UE is, and/or who its target UE is, and/or which of the target D2D links, based on the received data packet from the first UE.
  • the first feedback information may further include a second reference signal, where the second reference signal is determined according to a predefined sequence.
  • the method further includes: the first UE receiving the second reference signal sent by the second UE, where the second reference signal is determined according to a predefined sequence.
  • the sequence may be a pseudo-random sequence, or may be a perfect sequence, or may be a sequence of low-zero correlation regions. This embodiment of the present invention does not limit this.
  • reference may be made to the description of the sequence in the foregoing embodiment of FIG. 7. To avoid repetition, details are not described herein again.
  • the first UE may perform estimation according to the second reference signal, and obtain channel quality information of the D2D link.
  • the first UE can be estimated using a path loss calculation method.
  • the first UE can calculate the transmit power of the second UE by using the difference dP of the transmit power between the second UE and the first UE, and then the first UE estimates the received signal on the sequence sent by the second UE.
  • the first UE can determine whether the current transmit power is suitable; or how much SNR can be obtained under the current transmit power, so that the first UE can select an appropriate transmit power or MCS value according to the path loss. .
  • the first UE may be estimated by using an equivalent signal to interference plus noise ratio (SINR) estimation method.
  • SINR signal to interference plus noise ratio
  • the first UE estimates the equivalent SINR on the sequence sent by the second UE, and then obtains the first UE that can be received by the second UE by using the difference dP between the transmit power of the second UE and the first UE.
  • Equivalent transmit power of the signal: SNRue2 SNR-dP. After the first UE estimates the equivalent transmit power, it can determine whether the transmit power needs to be adjusted and how much to adjust; or whether the MCS needs to be adjusted and how to adjust if the transmit power is not adjusted.
  • the first UE may send the transmit signal to the second UE according to the transmit resource.
  • the first UE may receive the second configuration information that is sent by the serving base station of the first UE, where the second configuration information includes indication information, where the indication information is used to indicate the a location of the transmitting resource; the first UE is determined according to the second configuration information The transmission resources are determined.
  • the serving base station of the first UE can send the second configuration information to the first UE by using signaling.
  • the signaling may be public signaling, such as a System Information Block (SIB).
  • SIB System Information Block
  • RRC radio resource control
  • the signaling may also be dedicated signaling sent to the first UE, such as Downlink Control Information (DCI) signaling.
  • DCI Downlink Control Information
  • the signaling may also be dedicated RRC signaling.
  • the invention is not limited thereto.
  • the first UE may acquire the association information, and receive the feedback resource sent by the second UE. Further, the first UE may determine, according to the association information and the feedback resource, The transmitting resource.
  • the association information is used to indicate an association relationship between the transmission resource and the feedback resource, the association information may be predefined, or the association information may be received from a serving base station of the first UE. of.
  • association information may be pre-configured on the first UE, or the serving base station of the first UE may send the association information to the first UE by using signaling.
  • the feedback resource pool can be pre-configured on the second UE, or the serving base station of the second UE can configure the feedback resource pool for the unicast link to the second UE by using signaling. In this way, the second UE can select a transmission resource from the feedback resource pool.
  • the feedback resource pool is a collection of feedback resources.
  • the first UE may receive the transmission resource sent by the second UE, where the transmission resource is determined by the second UE according to the feedback resource and the association information, where The association information is used to indicate an association relationship between the transmission resource and the feedback resource.
  • the feedback resource and the association information may be that the second UE is received from the serving base station of the second UE; or the feedback resource and the association information may be pre-configured on the second UE; or, feedback The resource may be that the second UE is received from a serving base station of the second UE, and the association information is pre-configured on the second UE.
  • the feedback resource pool and associated information can be pre-configured on the second UE.
  • the association information may be pre-configured on the second UE, and the serving base station of the second UE configures a feedback resource pool for the unicast link to the second UE by using signaling.
  • the serving base station of the second UE may configure, by signaling, a feedback resource pool and associated information for the unicast link to the second UE. In this way, the second UE may select a feedback resource from the feedback resource pool, and according to the feedback resource and the associated information. Determine the launch resource.
  • the transmitting resource is autonomously selected by the first UE from a pool of transmitting resources, wherein the feedback resource pool is pre-configured or the feedback resource pool is a service from the first UE. Received by the base station.
  • a pool of transmit resources can be pre-configured on the first UE.
  • the serving base station of the first UE may configure, by using signaling, a transmit resource pool for the unicast link to the first UE.
  • the transmit resource pool is a collection of transmit resources.
  • the method may further include: the first UE may acquire association information, where the association information is used to indicate an association relationship between the transmission resource and a feedback resource, where the association information is The defined or the association information is received from a serving base station of the first UE; the first UE determines a feedback resource according to the association information and the transmission resource.
  • the first UE may receive the first feedback information sent by the second UE according to the feedback resource.
  • the association information is used to indicate an association relationship between a transmitting resource and a feedback resource.
  • the association relationship may include that an offset value exists between a transmit power included in the feedback resource and a transmit power included in the transmit resource according to a predefined rule.
  • the association relationship may include: the cyclic prefix (Cyclic Prefix, CP) type included in the feedback resource is the same as the CP type included in the transmission resource.
  • the transmit power included in the feedback resource may be understood as the transmit power when the second UE sends the first feedback information to the first UE, or may be simply referred to as the transmit power fed back by the second UE.
  • the transmit power included in the transmit resource may be understood as the transmit power when the first UE transmits the transmit signal, or may be simply referred to as the transmit power sent by the first UE.
  • the method may further include: sending, by the first UE, SA indication information to the second UE, to enable the second UE to receive the transmit signal according to the SA indication information.
  • the SA indication information includes information about a transmission resource to be used by the first UE, where the transmission resource includes at least one of the following: an MCS, a transmit power, and a time-frequency resource.
  • the first UE may determine, according to the first feedback information, how the subsequent data packets are sent.
  • the method for the first UE to send subsequent data packets may be as follows: 1) if the first feedback information includes an ACK.
  • the first UE may send a data packet to be sent according to current configuration parameters. Sent to the second UE. That is to say, the first UE still uses the radio link configuration parameter of the last successful transmission to send the next data packet, and the configuration parameters include one or more of the following: MCS, transmit power, retransmission times, resources Quantity.
  • MCS radio link configuration parameter
  • transmit power transmit power
  • retransmission times resources Quantity.
  • the first UE may suspend the untransmitted retransmission packet of the transmitted data packet, and send the new data packet to be sent to the second UE according to the current configuration parameter. If the time at which the first UE receives the first feedback information is earlier than the time at which the next retransmission of the current data packet is sent, the first UE may terminate the transmission of the subsequent retransmission packet and directly start the transmission of the new data packet. At this time, the first UE needs to indicate to the second UE that the new data packet is transmitted instead of the retransmission of the previous data packet.
  • the first UE After transmitting the first transmission 1001 of the data packet, the first UE receives the first feedback information 1002 of the second UE, and the first feedback information includes an ACK. Then, the first UE terminates the second transmission 1003 of the originally planned data packet, that is, the first UE discards the retransmitted data packet originally scheduled to be performed, and directly performs the subsequent new data packet for the first time. Transfer 1004.
  • the first UE receives the ACK, it also acknowledges that the signal quality information sent by the second UE is received.
  • the signal quality information may be included in the first feedback information, or may be included in the second feedback information. It should be noted that the time when the first UE receives the ACK and receives the signal quality information is not limited in this embodiment. For example, the signal quality information may be received before or after the ACK is received, or the ACK and signal quality information may be received simultaneously. Then, the first UE adjusts the configuration parameter according to the signal quality information and/or the transmit power information; the first UE sends the data packet to be sent to the second UE according to the adjusted configuration parameter. .
  • the first UE may correspondingly reduce the used transmit power at the time of transmission of the next data packet.
  • the reduced transmit power value may be: a reduced transmit power value obtained according to the signal quality information; or, the transmit power value is decreased according to a predefined step size; or the transmit power value is decreased according to a step configured by the network.
  • the invention is not limited thereto.
  • the reduced transmit power value cannot exceed the lower limit of the allowed transmit power. This lower limit value may be based on the first UE
  • the network can also be configured through signaling. When the reduced transmit power value is lower than the lower limit value, the first UE transmits the power specified by the lower limit value. In this way, the excess power can be reduced in time, thereby reducing the co-channel interference in the entire network, thereby improving the efficiency of the system.
  • the first UE may use fewer retransmission times, or A subsequent retransmission template corresponding to fewer retransmissions is used to transmit subsequent data packets to be transmitted. In this way, the first UE adjusts the number of retransmissions according to the received signal quality information, thereby improving the spectrum efficiency of the system.
  • the first UE may use a higher MCS level and if the size of the data packet to be transmitted No change, you can use fewer time-frequency resources. In this way, the first UE adjusts the MCS level according to the received signal quality information, or uses less time-frequency resources to transmit subsequent data packets, which can reduce co-channel interference.
  • the first UE sends the retransmission packet of the transmitted data packet to the second UE according to the current configuration parameter. That is to say, after receiving the NACK, the first UE does not change the current configuration parameters, and continues to try to retransmit the data packet.
  • the first UE receives the NACK, it also acknowledges that the signal quality information sent by the second UE is received.
  • the signal quality information may be included in the first feedback information, or may be included in the second feedback information. It should be noted that the time when the first UE receives the ACK and receives the signal quality information is not limited in this embodiment. For example, the signal quality information may be received before or after the ACK is received, or the ACK and signal quality information may be received simultaneously. Then, the first UE may adjust the configuration parameter according to the signal quality information and/or the transmit power information, and then send the configuration.
  • the first UE adjusts configuration parameters according to the signal quality information and/or the transmission power information; the first UE is adjusted according to the The configuration parameter sends a retransmission packet of the sent data packet to the second UE.
  • the first UE may increase the number of retransmissions of the transmitted data packet or change the retransmission pattern, and the transmitted data The retransmission packet of the packet is sent to the second UE.
  • the first UE can successfully transmit the data packet by increasing the number of retransmissions or changing the retransmission pattern. There is no need to change other configuration parameters such as transmit power.
  • a larger number of retransmissions or a modified retransmission pattern may be used for subsequent new data packets.
  • the first UE may adjust the configuration parameter according to the signal quality information, and perform subsequent transmission according to the adjusted configuration parameter.
  • a retransmission of the transmitted data packet with the number of retransmissions of 2 may be directly sent.
  • IR Incremental Redundancy
  • the first UE may increase the use of the subsequent new data packet. Transmit power.
  • the increased transmit power value may be: an increased power value obtained according to the signal quality information; or, the transmit power value is increased by a predefined step size; or the transmit power value is increased according to a step configured by the network. And the increased transmit power cannot exceed the upper limit of the allowed transmit power.
  • This upper limit value may be implemented based on the first UE or may be configured by the network through signaling. When the increased transmit power is higher than the upper limit value, the first UE transmits the new data packet by using the power specified by the upper limit value as the transmit power.
  • the first UE can increase the transmission power under the allowed conditions without adding additional spectrum resources, thereby improving the efficiency of the system.
  • the first UE may use a lower one. MCS level, and if the size of subsequent new packets does not change, more time-frequency resources need to be used to send. At this time, it is not suitable to increase the number of retransmissions or increase the transmission power. Only by lowering the MCS level, a lower equivalent code rate is used to improve the stability of the link. That is, the first UE can use a lower MCS level to transmit subsequent new data packets.
  • the first UE may ensure successful transmission of subsequent data packets according to the first feedback information or according to the first feedback information and the second feedback information, thereby improving the spectral efficiency of the system.
  • the second UE may send the generated second feedback information to the serving base station of the second UE. If the first UE and the second UE are located in the same cell, the serving base station of the second UE and the serving base station of the first UE are the same base station. If the first UE and the second UE are located in different cells, the serving base station of the second UE may send the second feedback information to the serving base station of the first UE by signaling between the base stations.
  • the serving base station of the first UE may schedule and configure resources of the D2D link according to the second feedback information and the communication status of the entire network.
  • the first UE may further receive the first configuration information that is sent by the serving base station of the first UE, where the first configuration information includes at least one of the following: retransmission The configuration information of the number of times or the retransmission pattern, the adjustment information of the transmission power or the transmission power, the information of the used MCS, and the indication information of the used time-frequency resource, and the first configuration information is the serving base station of the first UE. Determining, according to the second feedback information sent by the second UE, the first UE, according to the first configuration information, adjusting a configuration parameter, and sending, according to the adjusted configuration parameter, a subsequent data packet to be sent to the The second UE is described.
  • the first configuration information may further include information for indicating an ID of the D2D link.
  • the first UE can adjust the configuration parameter according to the first configuration information sent by the serving base station of the first UE, and can avoid the impact on the other UEs and other links caused by the first UE self-adjustment.
  • the manner in which the first UE sends subsequent data packets according to the first configuration information may be as follows:
  • the first UE receives the first configuration information sent by the serving base station of the first UE, the first UE The data packets buffered in the transmit buffer have not yet been completely transmitted.
  • the first UE may use the previously adopted configuration parameters to complete the retransmission of the current data packet. Then, the first UE adjusts the configuration parameter according to the first configuration information, and sends the subsequent retransmission packet or the subsequent new data packet by using the adjusted configuration parameter.
  • the first UE receives the first feedback information 1102 from the second UE after transmitting the first transmission 1101 of the data packet, after which the first configuration information 1103 transmitted from the serving base station of the first UE is received. However, the first UE still sends the second transmission 1104 of the data packet according to the previous configuration parameters, and continues to receive the first feedback information 1105 sent by the second UE. And after 1105, the first UE adjusts the configuration parameters according to the first configuration information 1103. That is to say, after 1105, the first configuration information is only valid. After 1105, the first UE transmits 1106 in the new configuration.
  • the new configuration refers to the configuration parameter adjusted according to the first configuration information 1103.
  • the first UE may adjust the configuration parameter according to the first configuration information, and adopt the adjusted The configuration parameter sends a retransmission packet for the currently unsuccessfully transmitted packet.
  • the first UE receives the first feedback information 1202 from the second UE after transmitting the first transmission 1201 of the data packet, after which the first configuration information 1203 transmitted from the serving base station of the first UE is received. Then, the first UE adjusts the configuration parameters according to the first configuration information 1103. And, after 1203, 1204 is transmitted in accordance with the new configuration.
  • the new configuration refers to the configuration parameter adjusted according to the first configuration information 1203.
  • the first UE may adjust the configuration parameter according to the first configuration information, and send the subsequent new data packet by using the adjusted configuration parameter.
  • the configuration parameter may include at least one of the following: an MCS level, a number of retransmissions, retransmission pattern information, transmission power information, and indication information of a time-frequency resource.
  • FIG. 9 may be performed by the user device 400 illustrated in the embodiment of FIG. 4 above.
  • FIG. 13 is a flow chart of a method for D2D communication in accordance with another embodiment of the present invention.
  • the method shown in Figure 13 includes:
  • the base station receives feedback information sent by the second user equipment UE, where the feedback signal is
  • the information includes signal quality information and/or transmission power information of the D2D link between the first UE and the second UE.
  • the base station generates first configuration information according to the feedback information.
  • the base station sends the first configuration information to a first UE, where the base station is a serving base station of the first UE.
  • the base station generates the first configuration information according to the feedback information received from the second UE, and sends the first configuration information to the first UE, so that the first UE can adjust the configuration parameter according to the first configuration information. In this way, not only the correct transmission of data on the D2D link between the first UE and the second UE but also the transmission of links of other UEs can be guaranteed.
  • the base station in FIG. 13 is also the serving base station of the second UE. If the first UE and the second UE are located in different cells, the serving base station of the second UE is different from the base station in FIG. Then, 1301 may include: receiving, by the serving base station of the second UE, feedback information sent by the second UE.
  • the base station receives the feedback information from the serving base station of the second UE by using signaling between the base stations, and the feedback information is sent by the second UE to the second UE.
  • Serving base station
  • the feedback information in 1301 includes signal quality information and/or transmit power information of a D2D link between the first UE and the second UE.
  • the feedback information in the 1301 may further include indication information, where the indication information is used to indicate at least one of: an ID of the first UE, an ID of the second UE, and the D2D chain The ID of the road.
  • the base station can know which D2D link the signal quality information and/or the transmission power information in the feedback information is for.
  • the ID of the first UE may be an International Mobile Subscriber Identification Number (IMSI) number of the first UE, or may be a network temporary identifier of the first UE.
  • the ID of the second UE may be the MISI number of the second UE, or may be the network temporary identifier of the second UE.
  • the ID of the D2D link may be a Radio Network Temporary Identity (RNTI) of the D2D link, that is, a D2D-RNTI.
  • RNTI Radio Network Temporary Identity
  • the first configuration information in the 1302 may include at least one of the following: retransmission times or retransmission pattern configuration information, transmission power or transmission power adjustment information, and modulation coding used.
  • the first configuration information in 1302 may further include information indicating an ID of the D2D link.
  • the base station sends the first configuration information to the first UE by using a cellular link.
  • the method may further include: the base station sending the second configuration information to the first UE.
  • the second configuration information includes a transmission resource pool and/or association information for the D2D link, where the association information is used to indicate an association relationship between the transmission resource and the feedback resource.
  • the first UE may send a data packet to the second UE according to the second configuration information.
  • the method may further include: sending, by the base station, third configuration information to the second UE, where
  • the third configuration information includes a feedback resource pool and/or association information for the D2D link, and the association information is used to indicate an association relationship between the transmission resource and the feedback resource.
  • the base station may only send the second configuration information to the first UE; or the base station may only send the third configuration information to the second UE; or The base station sends the second configuration information to the first UE and the third configuration information to the second UE.
  • the method shown in FIG. 13 can be performed by the base station 500 shown in the embodiment of FIG. 5 described above.
  • FIG. 14 is a flow chart of a method for D2D communication in accordance with another embodiment of the present invention.
  • the method shown in Figure 14 includes:
  • the second base station receives the feedback information sent by the second user equipment UE, where the feedback information includes signal quality information and/or transmit power information of the D2D link between the first UE and the second UE.
  • the second base station is a serving base station of the second UE.
  • the second base station sends the feedback information to a first base station, where the first base station is a serving base station of a first UE, and the first UE and the second UE are located in different cells.
  • the serving base station of the second UE when the first UE and the second UE are located in different cells, the serving base station of the second UE sends the feedback information received from the second UE to the serving base station of the first UE, and can The serving base station of the first UE is caused to obtain feedback information about the D2D link.
  • the signal quality information includes at least one of: reference signal received power RSRP, reference signal received quality RSRQ, received signal strength indicator RSSI, channel quality indicator CQI, and adjustment information of the CQI;
  • the transmission power information includes adjustment values of the value of the transmission power and/or transmission power.
  • the second base station sends the feedback information to the first base station by using signaling between the base stations.
  • the feedback information further includes indication information, where the indication information is used to indicate at least one of: an ID of the first UE, an ID of the second UE, and the D2D link. ID.
  • the ID of the first UE may be an International Mobile Subscriber Identification Number (IMSI) number of the first UE, or may be a network temporary identifier of the first UE.
  • the ID of the second UE may be the MISI number of the second UE, or may be the network temporary identifier of the second UE.
  • the ID of the D2D link may be a Radio Network Temporary Identity (RNTI) of the D2D link, that is, a D2D-RNTI.
  • RNTI Radio Network Temporary Identity
  • the method shown in FIG. 14 may further include: the second base station sending configuration information to the second UE.
  • the configuration information includes a feedback resource pool and/or association information, where the association information is used to indicate an association relationship between the transmission resource and the feedback resource.
  • the method shown in FIG. 14 can be performed by the base station 600 shown in the embodiment of FIG. 6 described above.
  • FIGS. 15 through 18 illustrate signaling flow diagrams of D2D communication in accordance with an embodiment of the present invention. It should be noted that, for a detailed description of the method in FIG. 15 to FIG. 18, reference may be made to the related description in the foregoing embodiments of FIG. 1 to FIG. 14. To avoid repetition, details are not described herein again.
  • Figure 15 is a signaling flow diagram of D2D communication in accordance with one embodiment of the present invention. The method shown in Figure 15 includes:
  • the first UE 151 generates a transmit signal.
  • the first UE 151 sends a transmit signal to the second UE 152.
  • the first UE 151 transmits a transmission signal to the second UE 152 through the D2D link between the first UE 151 and the second UE 152.
  • the second UE 152 generates first feedback information.
  • the second UE 152 sends the first feedback information to the first UE 151.
  • the transmit signal may be a first reference signal.
  • the first feedback information includes signal quality information and/or transmit power information of the D2D link.
  • the transmit signal may be a data packet.
  • the first feedback information includes response information after the second UE 152 demodulates the data packet.
  • the response information is ACK or NACK.
  • the data packet can include a DMRS.
  • the data packet may further include first indication information.
  • the first indication information is used to indicate at least one of: an ID of the first UE, an ID of the second UE, and an ID of the D2D link.
  • the first feedback information may further include signal quality information and/or transmit power information of the D2D link.
  • the first feedback information may further include a second reference signal.
  • the second reference signal is determined by a predefined sequence.
  • 1501 in FIG. 15 may refer to 901 in the foregoing embodiment of FIG. 9, 1502 in FIG. 15 may be 902 in the foregoing embodiment of FIG. 9, and 1503 in FIG. 15 may refer to 702 in the foregoing embodiment of FIG. 1504 of 15 may be 703 in the foregoing embodiment of FIG. 7. To avoid repetition, details are not described herein again.
  • the method may further include:
  • the second UE 152 generates second feedback information.
  • the second UE 152 sends the second feedback information to the serving base station 153 of the second UE.
  • it may also include
  • the second UE 152 sends the second feedback information to the first UE 151.
  • the second feedback information includes signal quality information and/or transmit power information of the D2D link.
  • the second feedback information in 1506 may further include first indication information.
  • the first indication information is used to indicate at least one of: an ID of the first UE, an ID of the second UE, and an ID of the D2D link.
  • serial numbers herein do not constitute a limitation on the order of execution.
  • 1505 can be with 1503 Execute simultaneously.
  • 1506 can be executed after 1505 and before 1504. The invention is not limited thereto.
  • the method may further include:
  • the serving base station 153 of the second UE sends the second feedback information to the serving base station 154 of the first UE.
  • the serving base station 153 of the second UE transmits the second feedback information to the serving base station 154 of the first UE by signaling between the base stations.
  • the serving base station 154 of the first UE generates first configuration information.
  • the serving base station 153 of the second UE generates second configuration information.
  • the serving base station 154 of the first UE and the serving base station 153 of the second UE may respectively generate first configuration information and second configuration information for the D2D link according to the second feedback information and according to the communication state of the entire network. .
  • the serving base station 154 of the first UE sends the first configuration information to the first UE 151.
  • the serving base station 154 of the first UE transmits the first configuration information to the first UE 151 through the cellular link.
  • the serving base station 153 of the second UE sends the second configuration information to the second UE 152.
  • the serving base station 153 of the second UE transmits the second configuration information to the second UE 152 through the cellular link.
  • 1510 and 1512 may not be executed.
  • the first configuration information may include a transmit resource pool and/or associated information for the D2D link.
  • the association information is used to indicate an association relationship between the transmission resource and the feedback resource.
  • the first UE 151 adjusts configuration parameters according to the first configuration information.
  • the configuration parameter may include at least one of the following: an MCS level, a number of retransmissions, retransmission pattern information, transmission power information, and indication information of a time-frequency resource.
  • the first UE 151 sends the subsequent data packet to the second UE 152 according to the adjusted configuration parameter.
  • the first UE 151 may send the transmission resource to the second UE 152 (not shown in FIG. 17) through the SA indication information, so that the second UE 152 receives the subsequent data packet according to the transmission resource.
  • serial numbers herein do not constitute a limitation on the order of execution.
  • 1509 can be with 1510 Execute simultaneously.
  • 1512 can be executed before 1511.
  • the invention is not limited thereto.
  • the serving base station 153 of the second UE is also the serving base station of the first UE, and may be collectively referred to as the serving base station 153.
  • the serving base station 153 may further include:
  • the serving base station 153 generates first configuration information.
  • the serving base station 153 may generate first configuration information for the D2D link according to the second feedback information and according to the communication state of the entire network.
  • the serving base station 153 generates second configuration information.
  • the serving base station 153 transmits the first configuration information to the first UE 151.
  • the serving base station 153 transmits the second configuration information to the first UE 152.
  • 1516 and 1518 may not be executed. In this way, signaling overhead can be reduced.
  • the first configuration information may include a transmit resource pool and/or associated information for the D2D link.
  • the association information is used to indicate an association relationship between the transmission resource and the feedback resource.
  • the first UE 151 adjusts configuration parameters according to the first configuration information.
  • the configuration parameter may include at least one of the following: an MCS level, a number of retransmissions, retransmission pattern information, transmission power information, and indication information of a time-frequency resource.
  • the first UE 151 sends the subsequent data packet to the second UE 152 according to the adjusted configuration parameter.
  • the first UE 151 may send the transmission resource to the second UE 152 (not shown in FIG. 18) through the SA indication information, so that the second UE 152 receives the subsequent data packet according to the transmission resource.
  • serial numbers herein do not constitute a limitation on the order of execution.
  • 1515 can be executed concurrently with 1516.
  • 1518 can be executed before 1517.
  • the invention is not limited thereto.
  • FIG. 19 is a structural block diagram of a user equipment according to another embodiment of the present invention.
  • the user equipment 1900 shown in FIG. 19 is a second UE, and includes a processor 1901, a receiver 1902, a transmitter 1903, and a memory 1904.
  • the receiver 1902 is configured to receive a transmit signal sent by the first UE, where the transmit signal is transmitted by using a D2D link between the first UE and the second UE;
  • the processor 1901 is configured to generate first feedback information according to the transmit signal received by the receiver 1902;
  • the transmitter 1903 is configured to send the first feedback information generated by the processor 1901 to the first One UE.
  • the second UE after receiving the transmission signal sent by the first UE through the D2D link, the second UE that is the receiver generates the first feedback information, and sends the first feedback information to the first UE.
  • the first UE can be made to acquire the reception quality of the second UE, so that the QoS of the D2D communication can be guaranteed.
  • bus system 1905 which in addition to the data bus includes a power bus, a control bus, and a status signal bus.
  • bus system 1905 various buses are labeled as bus system 1905 in FIG.
  • the method disclosed in the foregoing embodiments of the present invention may be applied to the processor 1901 or implemented by the processor 1901.
  • the processor 1901 may be an integrated circuit chip with signal processing capabilities. In the implementation process, each step of the above method may be completed by an integrated logic circuit of hardware in the processor 1901 or an instruction in a form of software.
  • the processor 1901 may be a general-purpose processor, a digital signal processor (DSP), an application specific integrated circuit (ASIC), a Field Programmable Gate Array (FPGA), or the like. Programmable logic devices, discrete gates or transistor logic devices, discrete hardware components.
  • the methods, steps, and logical block diagrams disclosed in the embodiments of the present invention may be implemented or carried out.
  • the general purpose processor may be a microprocessor or the processor or any conventional processor or the like.
  • the steps of the method disclosed in the embodiments of the present invention may be directly implemented by the hardware decoding processor, or may be performed by a combination of hardware and software modules in the decoding processor.
  • the software module can be located in a conventional storage medium such as random access memory, flash memory, read only memory, programmable read only memory or electrically erasable programmable memory, registers, and the like.
  • the storage medium is located in the memory 1904, and the processor 1901 reads the information in the memory 1904 and performs the steps of the above method in combination with its hardware.
  • the memory 1904 in the embodiments of the present invention may be a volatile memory or a non-volatile memory, or may include both volatile and non-volatile memory.
  • the non-volatile memory may be a read-only memory (ROM), a programmable read only memory (PROM), an erasable programmable read only memory (Erasable PROM, EPROM), or an electric Erase programmable read only memory (EEPROM) or flash memory.
  • the volatile memory can be a Random Access Memory (RAM) that acts as an external cache.
  • RAM Random Access Memory
  • many forms of RAM are available, such as static random access memory (SRAM), dynamic random access memory.
  • DRAM Dynamic RAM
  • SDRAM Synchronous DRAM
  • DDR SDRAM Double Data Rate SDRAM
  • Enhanced SDRAM Enhanced SDRAM, ESDRAM
  • Synchlink DRAM SLDRAM
  • direct memory bus random access memory DR RAM
  • the embodiments described herein can be implemented in hardware, software, firmware, middleware, microcode, or a combination thereof.
  • the processor 1901 can be implemented in one or more application specific integrated circuits (ASICs), digital signal processing (DSP), digital signal processing equipment (DSP Device, DSPD), Programmable Logic Device (PLD), Field-Programmable Gate Array (FPGA), general purpose processor, controller, microcontroller, microprocessor, for performing the functions described herein Other electronic units or combinations thereof.
  • ASICs application specific integrated circuits
  • DSP digital signal processing
  • DSP Device digital signal processing equipment
  • PLD Programmable Logic Device
  • FPGA Field-Programmable Gate Array
  • controller microcontroller
  • microprocessor for performing the functions described herein Other electronic units or combinations thereof.
  • a code segment can represent a procedure, a function, a subprogram, a program, a routine, a subroutine, a module, a software group, a class, or any combination of instructions, data structures, or program statements.
  • a code segment can be combined into another code segment or hardware circuit by transmitting and/or receiving information, data, arguments, parameters or memory contents. Information, arguments, parameters, data, etc. can be communicated, forwarded, or transmitted using any suitable means including memory sharing, messaging, token passing, network transmission, and the like.
  • the techniques described herein can be implemented by modules (eg, procedures, functions, and so on) that perform the functions described herein.
  • the software code can be stored in a memory unit and executed by the processor.
  • the memory unit can be implemented in the processor or external to the processor, in the latter case the memory unit can be communicatively coupled to the processor via various means known in the art.
  • the transmit signal is a first reference signal
  • the first reference signal is used to perform quality measurement on the D2D link
  • the first feedback information includes the D2D link.
  • Signal quality information and/or transmit power information are examples of transmit power information
  • the transmitter 1903 is further configured to send the first feedback information to a serving base station of the second UE.
  • the transmitting signal is a data packet
  • the first feedback letter is The information includes: response information after the second UE demodulates the data packet, wherein the response information is a negative acknowledgement information ACK for demodulating correct or negative acknowledgement information NACK for demodulation error.
  • the data packet includes first indication information, where the first indication information is used to indicate at least one of: an identifier ID of the first UE, the second The ID of the UE and the ID of the D2D link.
  • the first feedback information further includes signal quality information and/or transmit power information of the D2D link.
  • the processor 1901 is further configured to generate second feedback information according to the demodulated result, where the second feedback information includes signal quality information of the D2D link and/or Transmit power information.
  • the transmitter 1903 is further configured to send the second feedback information generated by the processor 1901 to a serving base station of the first UE and/or the second UE.
  • the transmitter 1903 sends the second feedback information to the serving base station of the second UE, where the second feedback information further includes first indication information, where the first The indication information is used to indicate at least one of: an ID of the first UE, an ID of the second UE, and an ID of the D2D link.
  • the receiver 1902 before the receiver 1902 receives the transmission signal sent by the first UE, the receiver 1902 is further configured to: receive the scheduling allocation SA indication information sent by the first UE, where the SA indication information And the information about the transmit resource to be used by the first UE, where the transmit resource includes at least one of: a modulation and coding mode MCS, a transmit power, and a time-frequency resource; and the receiver 1902 is specifically configured to: according to the SA indication And receiving the transmission signal sent by the first UE.
  • the processor 1901 is further configured to generate a second reference signal according to the transmit signal, where the second reference signal is determined according to a predefined sequence; the transmitter 1903 is further configured to: The second reference signal is sent to the first UE.
  • the first feedback information includes a second reference signal, where the second reference signal is determined according to a predefined sequence.
  • the signal quality information includes at least one of: a reference signal received power RSRP, a reference signal received quality RSRQ, a received signal strength indicator RSSI, a channel quality indicator CQI, and an adjustment of the CQI.
  • Information; the transmit power information includes adjustment information of a value of transmit power and/or transmit power.
  • the transmitter 1903 is specifically configured to use, according to the feedback resource, The first feedback information is sent to the first UE.
  • the receiver 1902 before the transmitter 1903 sends the first feedback information to the first UE, the receiver 1902 is further configured to: receive configuration information sent by the serving base station of the second UE.
  • the configuration information includes second indication information, where the second indication information is used to indicate a location of the feedback resource.
  • the receiver 1902 before the transmitter 1903 sends the first feedback information to the first UE, the receiver 1902 is further configured to acquire association information, and receive the transmission sent by the first UE.
  • a resource where the association information is used to indicate an association relationship between the transmission resource and the feedback resource, the association information is predefined, or the association information is received from a serving base station of the second UE
  • the processor 1901 is further configured to determine the feedback resource according to the association information and the transmission resource.
  • the receiver 1902 before the transmitter 1903 sends the first feedback information to the first UE, the receiver 1902 is further configured to: receive the feedback resource sent by the first UE, The feedback resource is determined by the first UE according to the transmission resource and the association information, and the association information is used to indicate an association relationship between the transmission resource and the feedback resource.
  • the feedback resource is autonomously selected by the second UE from a pool of feedback resources, where the feedback resource pool is pre-configured or the feedback resource pool is a slave Received by the serving base station of the second UE.
  • the first UE and the second UE are located in the same cell, and the serving base station of the first UE and the serving base station of the second UE are the same base station.
  • the user equipment 1900 shown in FIG. 19 can implement the method implemented by the second UE in the foregoing embodiment. To avoid repetition, details are not described herein again.
  • FIG. 20 is a structural block diagram of a user equipment according to another embodiment of the present invention.
  • the UE 2000 shown in FIG. 20 is a first UE, and includes: a processor 2001, a receiver 2002, a transmitter 2003, and a memory 2004.
  • a processor 2001 configured to generate a transmit signal
  • the transmitter 2003 is configured to send the transmit signal generated by the processor 2001 to a second UE, where the transmit signal is transmitted by using a D2D link between the first UE and the second UE;
  • the receiver 2002 is configured to receive first feedback information sent by the second UE.
  • the first UE after transmitting the transmit signal to the second UE, the first UE can receive the first feedback information of the second UE. Thereby, the reception quality of the second UE can be acquired, so that the QoS of the D2D communication can be guaranteed.
  • bus system 2005 which in addition to the data bus includes a power bus, a control bus, and a status signal bus.
  • various buses are labeled as the bus system 2005 in FIG.
  • the method disclosed in the foregoing embodiment of the present invention may be applied to the processor 2001 or implemented by the processor 2001.
  • the processor 2001 may be an integrated circuit chip with signal processing capabilities. In the implementation process, each step of the foregoing method may be completed by an integrated logic circuit of hardware in the processor 2001 or an instruction in a form of software.
  • the processor 2001 described above may be a general purpose processor, DSP, ASIC, FPGA or other programmable logic device, discrete gate or transistor logic device, discrete hardware component.
  • the methods, steps, and logical block diagrams disclosed in the embodiments of the present invention may be implemented or carried out.
  • the general purpose processor may be a microprocessor or the processor or any conventional processor or the like.
  • the steps of the method disclosed in the embodiments of the present invention may be directly implemented by the hardware decoding processor, or may be performed by a combination of hardware and software modules in the decoding processor.
  • the software module can be located in a conventional storage medium such as random access memory, flash memory, read only memory, programmable read only memory or electrically erasable programmable memory, registers, and the like.
  • the storage medium is located in the memory 2004, and the processor 2001 reads the information in the memory 2004 and completes the steps of the above method in combination with its hardware.
  • the memory 2004 in the embodiments of the present invention may be a volatile memory or a non-volatile memory, or may include both volatile and non-volatile memory.
  • the non-volatile memory may be a ROM, a PROM, an EPROM, an EEPROM, or a flash memory.
  • the volatile memory can be RAM, which acts as an external cache.
  • many forms of RAM are available, such as SRAM, DRAM, SDRAM, DDR SDRAM, ESDRAM, SLDRAM, and DR RAM.
  • the memory 2004 of the systems and methods described herein is intended to comprise, without being limited to, these and any other suitable types of memory.
  • the embodiments described herein can be implemented in hardware, software, firmware, middleware, microcode, or a combination thereof.
  • the processor 2001 can be implemented in one or more ASICs, DSPs, DSPDs, PLDs, FPGAs, general purpose processors, controllers, microcontrollers, microprocessors, other electronics for performing the functions described herein. Unit or combination thereof.
  • a code segment can represent a procedure, a function, a subprogram, a program, a routine, a subroutine, a module, a software group, a class, or any combination of instructions, data structures, or program statements.
  • a code segment can be combined into another code segment or hardware circuit by transmitting and/or receiving information, data, arguments, parameters or memory contents. Information, arguments, parameters, data, etc. can be communicated, forwarded, or transmitted using any suitable means including memory sharing, messaging, token passing, network transmission, and the like.
  • the techniques described herein can be implemented by modules (eg, procedures, functions, and so on) that perform the functions described herein.
  • the software code can be stored in a memory unit and executed by the processor.
  • the memory unit can be implemented in the processor or external to the processor, in the latter case the memory unit can be communicatively coupled to the processor via various means known in the art.
  • the transmit signal is a first reference signal
  • the first reference signal is used to perform quality measurement on the D2D link
  • the first feedback information includes the D2D link.
  • Signal quality information and/or transmit power information are examples of transmit power information
  • the transmitting signal is a data packet
  • the first feedback information includes response information after the second UE demodulates the data packet, where the response information is Demodulate the correct acknowledgment message ACK or demodulate the erroneous negative acknowledgment message NACK.
  • the data packet includes first indication information, where the first indication information is used to indicate at least one of: an identifier ID of the first UE, the second The ID of the UE and the ID of the D2D link.
  • the first feedback information further includes: signal quality information and/or transmit power information of the D2D link.
  • the receiver 2002 is further configured to receive second feedback information sent by the second UE, where the second feedback information includes signal quality information of the D2D link and/or Transmit power information.
  • the processor 2001 is further configured to: send the data packet to be sent to the second UE according to the current configuration parameter; or, the suspension has been The untransmitted retransmission packet of the transmitted data packet, and the new data packet to be sent is sent to the second UE according to the current configuration parameter.
  • the processor 2001 is further configured to: adjust the configuration parameter according to the signal quality information and/or the transmit power information; The configuration parameter sends a data packet to be sent to the second UE.
  • the processor 2001 is further configured to: if the retransmission packet of the sent data packet has not been sent, according to the current configuration parameter, Sending a retransmission packet of the transmitted data packet to the second UE; or, if the retransmission packet of the transmitted data packet has been sent, increasing the number of retransmissions of the transmitted data packet or changing the retransmission pattern And transmitting a retransmission packet of the sent data packet to the second UE.
  • the processor 2001 is further configured to: if the retransmission packet of the sent data packet has not been sent, according to the signal quality information and/or Or transmitting the power information, adjusting the configuration parameter; sending the retransmission packet of the sent data packet to the second UE according to the adjusted configuration parameter.
  • the processor 2001 is further configured to: if the retransmission packet of the sent data packet has been sent, according to the signal quality information and/or Transmitting the power information, adjusting the configuration parameter, and sending the subsequent data packet to the second UE according to the adjusted configuration parameter.
  • the receiver 2002 is further configured to receive first configuration information that is sent by the serving base station of the first UE, where the first configuration information includes at least one of the following: retransmission The configuration information of the number of times or the retransmission pattern, the adjustment information of the transmission power or the transmission power, the information of the modulation and coding scheme MCS used, and the indication information of the used time-frequency resource, and the first configuration information is the first UE.
  • the serving base station is determined according to the second feedback information sent by the second UE.
  • the processor 2001 is further configured to adjust configuration parameters according to the first configuration information.
  • the transmitter 2003 is further configured to send the subsequent data packet to the second UE according to the adjusted configuration parameter.
  • the first configuration information further includes information used to indicate an ID of the D2D link.
  • the configuration parameter includes at least one of the following: a modulation and coding mode MCS level, a number of retransmissions, retransmission pattern information, transmission power information, and indication information of a time-frequency resource.
  • the sender 2003 before the transmitter 2003 sends the transmit signal to the second UE, the sender 2003 is further configured to: send the scheduling allocation SA indication information to the second UE, so that The second UE receives the transmission signal according to the SA indication information, where the SA indication information includes information of a transmission resource to be used by the first UE, and the transmission resource includes at least one of the following: modulation Encoding mode MCS, transmit power and time-frequency resources.
  • the receiver 2002 is further configured to receive the second reference signal sent by the second UE, where the second reference signal is determined according to a predefined sequence.
  • the first feedback information further includes a second reference signal, where the second reference signal is determined according to a predefined sequence.
  • the signal quality information includes at least one of: a reference signal received power RSRP, a reference signal received quality RSRQ, a received signal strength indicator RSSI, a channel quality indicator CQI, and an adjustment of the CQI. information.
  • the transmission power information includes adjustment information of a value of transmission power and/or transmission power.
  • the transmitter 2003 is specifically configured to send the transmit signal to the second UE according to the transmit resource.
  • the receiver 2002 is further configured to: receive second configuration information sent by the serving base station of the first UE, where The second configuration information includes second indication information, where the second indication information is used to indicate a location of the transmitting resource.
  • the transmitting resource is autonomously selected by the first UE from a pool of transmitting resources, where the transmitting resource pool is pre-configured or the transmitting resource pool is a slave Received by the serving base station of the first UE.
  • the receiver 2002 before the transmitter sends the transmit signal to the second UE, the receiver 2002 is further configured to acquire the association information, and receive the feedback resource sent by the second UE, where The association information is used to indicate an association relationship between the transmission resource and the feedback resource, the association information is predefined, or the association information is received from a serving base station of the first UE.
  • the processor 2001 is further configured to determine the transmit resource according to the association information and the feedback resource.
  • the receiver 2002 before the receiver 2002 receives the first feedback information sent by the second UE, the receiver 2002 is further configured to acquire association information, where the association information is used to indicate the An association relationship between the resource and the feedback resource, the association information is predefined or the association information is received from a serving base station of the first UE.
  • the processor 2001 is further configured to determine a feedback resource according to the association information and the transmission resource.
  • the receiver 2002 is specifically configured to receive the first feedback information sent by the second UE according to the feedback resource.
  • the first UE and the second UE are located in the same small
  • the serving base station of the first UE and the serving base station of the second UE are the same base station.
  • the user equipment 2000 shown in FIG. 20 can implement the method implemented by the first UE in the foregoing embodiment. To avoid repetition, details are not described herein again.
  • FIG. 21 is a block diagram showing the structure of a base station according to another embodiment of the present invention.
  • the base station 2100 shown in FIG. 21 includes a processor 2101, a receiver 2102, a transmitter 2103, and a memory 2104.
  • the receiver 2102 is configured to receive feedback information sent by the second user equipment UE, where the feedback information includes signal quality information and/or transmit power information of a D2D link between the first UE and the second UE.
  • the processor 2101 is configured to generate first configuration information according to the feedback information received by the receiver 2102.
  • the transmitter 2103 is configured to send the first configuration information generated by the processor 2101 to the first UE, where the base station is a serving base station of the first UE.
  • the base station generates the first configuration information according to the feedback information received from the second UE, and sends the first configuration information to the first UE, so that the first UE can adjust the configuration parameter according to the first configuration information. In this way, not only the correct transmission of data on the D2D link between the first UE and the second UE but also the transmission of links of other UEs can be guaranteed.
  • bus system 2105 which in addition to the data bus includes a power bus, a control bus, and a status signal bus.
  • bus system 2105 includes a power bus, a control bus, and a status signal bus.
  • bus system 2105 for clarity of description, various buses are labeled as bus system 2105 in FIG.
  • the method disclosed in the foregoing embodiment of the present invention may be applied to the processor 2101 or implemented by the processor 2101.
  • the processor 2101 may be an integrated circuit chip with signal processing capabilities. In the implementation process, each step of the foregoing method may be completed by an integrated logic circuit of hardware in the processor 2101 or an instruction in a form of software.
  • the processor 2101 described above may be a general purpose processor, DSP, ASIC, FPGA or other programmable logic device, discrete gate or transistor logic device, discrete hardware component.
  • the methods, steps, and logical block diagrams disclosed in the embodiments of the present invention may be implemented or carried out.
  • the general purpose processor may be a microprocessor or the processor or any conventional processor or the like.
  • the steps of the method disclosed in the embodiments of the present invention may be directly implemented by the hardware decoding processor, or may be performed by a combination of hardware and software modules in the decoding processor.
  • the software module can be located in a conventional storage medium such as random access memory, flash memory, read only memory, programmable read only memory or electrically erasable programmable memory, registers, and the like.
  • the storage medium is located in the memory 2104, and the processor 2101 reads the information in the memory 2104 and completes the above-mentioned side in combination with the hardware thereof.
  • the memory 2104 in the embodiments of the present invention may be a volatile memory or a non-volatile memory, or may include both volatile and non-volatile memory.
  • the non-volatile memory may be a ROM, a PROM, an EPROM, an EEPROM, or a flash memory.
  • the volatile memory can be RAM, which acts as an external cache.
  • many forms of RAM are available, such as SRAM, DRAM, SDRAM, DDR SDRAM, ESDRAM, SLDRAM, and DR RAM.
  • the memory 2104 of the systems and methods described herein is intended to comprise, without being limited to, these and any other suitable types of memory.
  • the embodiments described herein can be implemented in hardware, software, firmware, middleware, microcode, or a combination thereof.
  • the processor 2101 can be implemented in one or more ASICs, DSPs, DSPDs, PLDs, FPGAs, general purpose processors, controllers, microcontrollers, microprocessors, other electronics for performing the functions described herein Unit or combination thereof.
  • a code segment can represent a procedure, a function, a subprogram, a program, a routine, a subroutine, a module, a software group, a class, or any combination of instructions, data structures, or program statements.
  • a code segment can be combined into another code segment or hardware circuit by transmitting and/or receiving information, data, arguments, parameters or memory contents. Information, arguments, parameters, data, etc. can be communicated, forwarded, or transmitted using any suitable means including memory sharing, messaging, token passing, network transmission, and the like.
  • the techniques described herein can be implemented by modules (eg, procedures, functions, and so on) that perform the functions described herein.
  • the software code can be stored in a memory unit and executed by the processor.
  • the memory unit can be implemented in the processor or external to the processor, in the latter case the memory unit can be communicatively coupled to the processor via various means known in the art.
  • the transmitter 2103 is further configured to send, to the first UE, second configuration information, where the second configuration information includes a transmit resource pool for the D2D link and/or Correlation information, the association information is used to indicate an association relationship between the transmitting resource and the feedback resource.
  • the first UE and the second UE are located in the same cell, and the transmitter 2103 is further configured to send third configuration information to the second UE, where the third The configuration information includes a feedback resource pool and/or association information for the D2D link, and the association information is used to indicate an association relationship between the transmission resource and the feedback resource.
  • the first UE and the second UE are located in different cells, and the receiver 2102 is specifically configured to: receive, by using, the second UE from the serving base station of the second UE, Feedback.
  • the first configuration information includes at least one of the following: retransmission times or retransmission pattern configuration information, transmission power or transmission power adjustment information, and a modulation coding mode used by the MCS.
  • Information and instructions for using time-frequency resources include at least one of the following: retransmission times or retransmission pattern configuration information, transmission power or transmission power adjustment information, and a modulation coding mode used by the MCS.
  • the first configuration information further includes information used to indicate an identifier ID of the D2D link.
  • the feedback information further includes indication information, where the indication information is used to indicate at least one of: an ID of the first UE, an ID of the second UE, and The ID of the D2D link.
  • the signal quality information includes at least one of: a reference signal received power RSRP, a reference signal received quality RSRQ, a received signal strength indicator RSSI, a channel quality indicator CQI, and an adjustment of the CQI. information.
  • the transmission power information includes adjustment information of a value of transmission power and/or transmission power.
  • the base station 2100 shown in FIG. 21 can implement the method implemented by the serving base station of the first UE in the foregoing embodiment, and is not repeated here to avoid redundancy.
  • FIG. 22 is a block diagram showing the structure of a base station according to another embodiment of the present invention.
  • the base station 2200 shown in FIG. 22 is a second base station, and includes a processor 2201, a receiver 2202, a transmitter 2203, and a memory 2204.
  • the receiver 2202 is configured to receive feedback information sent by the second user equipment UE, where the feedback information includes signal quality information and/or transmit power information of a D2D link between the first UE and the second UE, where Said second base station is a serving base station of said second UE;
  • the transmitter 2203 is configured to send the feedback information received by the receiver 2202 to the first base station, where the first base station is a serving base station of the first UE, and the first UE and the second UE are located in different cells. .
  • the serving base station of the second UE when the first UE and the second UE are located in different cells, the serving base station of the second UE sends the feedback information received from the second UE to the serving base station of the first UE, which can enable the first UE.
  • the serving base station obtains feedback information about the D2D link.
  • bus system 2205 which in addition to the data bus includes a power bus, a control bus, and a status signal bus.
  • bus system 2205 various buses are labeled as bus system 2205 in FIG.
  • the method disclosed in the foregoing embodiment of the present invention may be applied to the processor 2201 or implemented by the processor 2201.
  • the processor 2201 may be an integrated circuit chip with signal processing capabilities. In the implementation process, each step of the foregoing method may be completed by an integrated logic circuit of hardware in the processor 2201 or an instruction in a form of software.
  • the processor 2201 described above may be a general purpose processor, DSP, ASIC, FPGA or other programmable logic device, discrete gate or transistor logic device, discrete hardware component.
  • the methods, steps, and logical block diagrams disclosed in the embodiments of the present invention may be implemented or carried out.
  • the general purpose processor may be a microprocessor or the processor or any conventional processor or the like.
  • the steps of the method disclosed in the embodiments of the present invention may be directly implemented by the hardware decoding processor, or may be performed by a combination of hardware and software modules in the decoding processor.
  • the software module can be located in a conventional storage medium such as random access memory, flash memory, read only memory, programmable read only memory or electrically erasable programmable memory, registers, and the like.
  • the storage medium is located in the memory 2204, and the processor 2201 reads the information in the memory 2204 and completes the steps of the above method in combination with its hardware.
  • the memory 2204 in the embodiments of the present invention may be a volatile memory or a non-volatile memory, or may include both volatile and non-volatile memory.
  • the non-volatile memory may be a ROM, a PROM, an EPROM, an EEPROM, or a flash memory.
  • the volatile memory can be RAM, which acts as an external cache.
  • many forms of RAM are available, such as SRAM, DRAM, SDRAM, DDR SDRAM, ESDRAM, SLDRAM, and DR RAM.
  • the memory 2204 of the systems and methods described herein is intended to comprise, without being limited to, these and any other suitable types of memory.
  • processor 2201 can be implemented in one or more ASICs, DSPs, DSPDs, PLDs, FPGAs, general purpose processors, controllers, microcontrollers, microprocessors, other electronics for performing the functions described herein Unit or combination thereof.
  • a code segment can represent a procedure, a function, a subprogram, a program, a routine, a subroutine, a module, a software group, a class, or any combination of instructions, data structures, or program statements.
  • a code segment can be combined into another code segment or hardware circuit by transmitting and/or receiving information, data, arguments, parameters or memory contents. Information, arguments, parameters, data, etc. can be communicated, forwarded, or transmitted using any suitable means including memory sharing, messaging, token passing, network transmission, and the like.
  • the techniques described herein can be implemented by modules (eg, procedures, functions, and so on) that perform the functions described herein.
  • the software code can be stored in a memory unit and executed by the processor.
  • the memory unit can be implemented in the processor or external to the processor, in the latter case the memory unit can be communicatively coupled to the processor via various means known in the art.
  • the transmitter 2203 is further configured to send configuration information to the second UE.
  • the configuration information includes a feedback resource pool and/or association information for the D2D link, where the association information is used to indicate an association relationship between a transmission resource and a feedback resource.
  • the feedback information further includes indication information, where the indication information is used to indicate at least one of: an identifier ID of the first UE, an ID of the second UE And the ID of the D2D link.
  • the signal quality information includes at least one of: a reference signal received power RSRP, a reference signal received quality RSRQ, a received signal strength indicator RSSI, a channel quality indicator CQI, and an adjustment of the CQI. information.
  • the transmission power information includes adjustment information of a value of transmission power and/or transmission power.
  • the base station 2200 shown in FIG. 22 can implement the method implemented by the serving base station of the second UE in the foregoing embodiment, and is not repeated here to avoid redundancy.
  • the disclosed systems, devices, and methods may be implemented in other manners.
  • the device embodiments described above are merely illustrative.
  • the division of the unit is only a logical function division.
  • there may be another division manner for example, multiple units or components may be combined or Can be integrated into another system, or some features can be ignored or not executed.
  • the mutual coupling or direct coupling or communication connection shown or discussed may be indirect coupling through some interface, device or unit.
  • a communication connection which may be in electrical, mechanical or other form.
  • the units described as separate components may or may not be physically separated, and the components displayed as units may or may not be physical units, that is, may be located in one place, or may be distributed to multiple network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of the embodiment.
  • each functional unit in each embodiment of the present invention may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit.
  • the functions may be stored in a computer readable storage medium if implemented in the form of a software functional unit and sold or used as a standalone product.
  • the technical solution of the present invention which is essential or contributes to the prior art, or a part of the technical solution, may be embodied in the form of a software product, which is stored in a storage medium, including
  • the instructions are used to cause a computer device (which may be a personal computer, server, or network device, etc.) to perform all or part of the steps of the methods described in various embodiments of the present invention.
  • the foregoing storage medium includes: a U disk, a mobile hard disk, a read-only memory (ROM), a random access memory (RAM), a magnetic disk, or an optical disk, and the like, which can store program codes. .

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

Selon un mode de réalisation, la présente invention concerne un équipement d'utilisateur (UE), une station de base et un procédé de communication D2D, le procédé comprenant les étapes suivantes : un second UE reçoit un signal de transmission transmis par un premier UE, le signal de transmission étant transmis par l'intermédiaire d'une liaison D2D entre le premier UE et le second UE ; le second UE génère des premières informations de rétroaction en fonction du signal de transmission ; le second UE transmet les premières informations de rétroaction au premier UE. Dans le mode de réalisation de la présente invention, le second UE génère, en tant que récepteur, les premières informations de rétroaction après la réception du signal de transmission transmis par le premier UE par l'intermédiaire de la liaison D2D, et transmet les premières informations de rétroaction au premier UE, de sorte que le premier UE puisse obtenir la qualité de réception du second UE, assurant ainsi la QS de la communication D2D.
PCT/CN2014/094041 2014-12-17 2014-12-17 Équipement d'utilisateur, station de base, et procédé de communication d2d WO2016095119A1 (fr)

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CN202010019467.6A CN111200875B (zh) 2014-12-17 2014-12-17 用户设备及d2d通信的方法
CN201480024261.5A CN105917733B (zh) 2014-12-17 2014-12-17 用户设备、基站及d2d通信的方法
PCT/CN2014/094041 WO2016095119A1 (fr) 2014-12-17 2014-12-17 Équipement d'utilisateur, station de base, et procédé de communication d2d

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CN112087799A (zh) * 2019-06-14 2020-12-15 华为技术有限公司 反馈资源的配置方法及终端装置
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CN112398610B (zh) * 2019-08-14 2022-03-08 大唐移动通信设备有限公司 反馈序列生成的方法及装置、终端以及计算机存储设备
CN112398610A (zh) * 2019-08-14 2021-02-23 大唐移动通信设备有限公司 反馈序列生成的方法及装置、终端以及计算机存储设备
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