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WO2015168917A1 - Procédé et dispositif de communication - Google Patents

Procédé et dispositif de communication Download PDF

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Publication number
WO2015168917A1
WO2015168917A1 PCT/CN2014/077078 CN2014077078W WO2015168917A1 WO 2015168917 A1 WO2015168917 A1 WO 2015168917A1 CN 2014077078 W CN2014077078 W CN 2014077078W WO 2015168917 A1 WO2015168917 A1 WO 2015168917A1
Authority
WO
WIPO (PCT)
Prior art keywords
communication
transmit power
power
uplink
user terminal
Prior art date
Legal status (The legal status 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 status listed.)
Ceased
Application number
PCT/CN2014/077078
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English (en)
Chinese (zh)
Inventor
刘德平
柯柏安
李强
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Huawei Technologies Co Ltd
Original Assignee
Huawei Technologies Co Ltd
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.)
Filing date
Publication date
Application filed by Huawei Technologies Co Ltd filed Critical Huawei Technologies Co Ltd
Priority to CN201480030209.0A priority Critical patent/CN105284164B/zh
Priority to PCT/CN2014/077078 priority patent/WO2015168917A1/fr
Publication of WO2015168917A1 publication Critical patent/WO2015168917A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W52/00—Power management, e.g. Transmission Power Control [TPC] or power classes
    • H04W52/04—Transmission power control [TPC]

Definitions

  • the present invention relates to the field of wireless communication technologies, and in particular, to a communication method and device. Background technique
  • LTE Long Term Evolution
  • UEs user equipments
  • eNBs evolved Node Bs
  • D2D Device to Device
  • the communication data between UEs does not need to be forwarded through the eNB.
  • the communication interaction can be directly performed between the UEs or directly under the assistance of the network.
  • LTE-D2D is the third-generation partner 3rd Generation Partnership Project (3GPP) newly defined LTE-based direct communication between UEs.
  • LTE-D2D communication technology is an application of D2D added in existing LTE systems. That is, D2D communication and LTE communication may coexist.
  • UE1 may transmit D2D communication data to UE2 and UE3 for D2D communication, and UE1 may also communicate with the eNB.
  • the process in which the UE1 transmits the communication data and the eNB receives the communication data is referred to as uplink communication; the process in which the eNB transmits the communication data, and the UE1 receives the communication data is referred to as the downlink communication; the UE1 serves as the data transmitter, and the UE and the UE perform the UE and the UE3.
  • the communication between them is D2D communication.
  • the UE performing the D2D communication generally transmits the D2D data at the maximum power.
  • the eNB when performing uplink communication with the eNB, the eNB generally adjusts the uplink transmit power of each UE communicating with the eNB according to the distance and the channel condition, so that the eNB arrives at the eNB.
  • the received power of the uplink signals of each UE is relatively balanced.
  • the uplink transmit power of the UE that is closer to the eNB may be smaller than the uplink transmit power of the UE that is farther from the eNB.
  • the received power of the signal transmitted by the UE that receives the D2D communication received by the eNB is higher than Other UEs performing uplink communication
  • the received power of the transmitted uplink signal in which an In Band Emission (IBE) occurs.
  • IBE In Band Emission
  • In-band leakage means that the energy of a signal with a higher received power leaks into a signal with a lower received energy in the frequency domain, and the in-band leakage affects the normal reception of the signal of the UE performing uplink communication in the LTE system, for the UE and Uplink communication between eNBs has an adverse effect.
  • Embodiments of the present invention provide a communication method and device to reduce adverse effects of in-band leakage on uplink communications.
  • a communication device including a transceiver, a processor, a memory, and a bus, wherein the transceiver, the processor, and the memory are all connected to a bus, where
  • the memory is configured to store program code executed by the processor
  • the processor is configured to invoke a program stored in the memory, acquire an uplink transmit power parameter, and determine a transmit power of the D2D communication according to the uplink transmit power parameter and a downlink path loss estimate; and control the transceiver according to the Transmitting the transmit power of the D2D communication to transmit D2D data;
  • the transceiver is configured to transmit D2D data according to a transmit power of the D2D communication determined by the processor.
  • the processor is specifically configured to determine a transmit power of the D2D communication as follows:
  • the processor is specifically configured to determine, according to the uplink transmit power, a transmit power of the D2D communication according to the following manner: determining the uplink transmit power, The transmit power for the D2D communication.
  • the processor is specifically configured to determine, according to the uplink transmit power, a transmit power of the D2D communication, as follows: determining that the uplink transmit power belongs to Power level;
  • the processor is specifically configured to determine, according to the manner, a power level to which the uplink transmit power belongs: determine a modulation format of the D2D communication, and determine an uplink. a power level to which the transmit power belongs in a modulation format corresponding to the D2D communication;
  • the transmit power of the D2D communication is determined according to the correspondence between the uplink transmit power, the modulation format of the D2D communication, and the power level in each modulation format and the transmit power of the D2D communication.
  • the processor is further configured to: obtain a power offset
  • the processor is specifically configured to determine, according to the uplink transmit power parameter, a transmit bandwidth of the D2D communication, a downlink path loss estimate, and the power offset, to determine a transmit of the D2D communication. Power; or
  • the transmit power of the D2D communication is determined according to the uplink transmit power parameter, the transmit bandwidth of the D2D communication, the modulation format of the D2D communication, the downlink path loss estimate, and the power offset amount.
  • the processor is specifically configured to determine a transmit power of the D2D communication as follows:
  • the processor is further configured to:
  • the transceiver is specifically configured to transmit D2D data as follows:
  • the processor is configured to determine the number of transmissions or the number of retransmissions as follows:
  • the second correspondence is a correspondence between the transmission power of the D2D communication and the number of transmissions, or a correspondence between the transmission power of the D2D communication and the number of retransmissions relationship.
  • the transceiver is further configured to:
  • the transmission number information is used by the second user terminal to receive data according to the transmission times information, and the second user terminal is a terminal that performs D2D communication with the first user terminal;
  • the retransmission times information is used by the second user terminal to receive data according to the retransmission times information, and the second user terminal is a terminal that performs D2D communication with the first user terminal.
  • a communication device in a second aspect, includes a transceiver, a processor, a memory, and a bus, wherein the transceiver, the processor, and the memory are all connected to the bus, where
  • the memory is configured to store program code executed by the processor
  • the processor the program stored in the memory is used to determine an uplink transmit power parameter
  • the transceiver is configured to send the uplink transmit power parameter
  • the uplink transmit power parameter is used for device-to-device D2D communication First user terminal according to downlink path loss and the uplink transmission
  • the power parameter determines the transmit power of the D2D communication.
  • the processor is further configured to: determine a power offset amount
  • the transceiver is further configured to: deliver the power offset amount;
  • the power offset amount is used by the first user terminal to determine a transmit power of the D2D communication according to the power offset amount, the downlink path loss estimate, and the uplink transmit power parameter.
  • the processor is further configured to: determine a transmission bandwidth of the D2D communication;
  • the transceiver is further configured to: deliver an emission bandwidth of the D2D communication;
  • the transmit bandwidth of the D2D communication is used by the first user terminal to determine an uplink transmit power according to a transmit bandwidth of the D2D communication, the downlink path loss estimate, and the uplink transmit power parameter.
  • the processor is further configured to: determine a modulation format of the D2D communication;
  • the transceiver is further configured to: deliver a modulation format of the D2D communication;
  • the modulation format of the D2D communication is used by the first user terminal to determine an uplink transmit power according to the modulation format of the D2D communication, the downlink path loss estimation, and the uplink transmit power parameter.
  • a user terminal in a third aspect, includes: a receiving unit, a determining unit, and a transmitting unit, where
  • the determining unit is configured to acquire an uplink transmit power parameter transmitted by the network device, and determine a transmit power of the D2D communication according to the downlink path loss estimate and the uplink transmit power parameter received by the receiving unit;
  • the transmitting unit is configured to transmit D2D data according to the transmit power of the D2D communication determined by the determining unit.
  • the determining unit is specifically configured to determine a transmit power of the D2D communication as follows: Determining an uplink transmit power according to the uplink transmit power parameter, a transmit bandwidth of the D2D communication, and the downlink path loss estimate, and determining a transmit power of the D2D communication according to the uplink transmit power; or
  • the determining unit is specifically configured to determine, according to the uplink transmit power, a transmit power of the D2D communication according to the following manner: determining the uplink transmit power, determining The transmit power for the D2D communication.
  • the determining unit is specifically configured to determine, according to the uplink transmit power, a transmit power of the D2D communication, as follows: determining that the uplink transmit power belongs to Power level;
  • the determining unit is specifically configured to determine, according to the manner, a power level to which the uplink transmit power belongs: determining, according to the uplink transmit power, the determining The power level to which the uplink transmit power belongs in each modulation format corresponding to the D2D communication;
  • the determining unit is specifically configured to determine, according to the manner, the transmit power of the D2D communication, according to the uplink transmit power, the modulation format of the D2D communication, and the power level of each modulation format and the transmit power of the D2D communication. Correspondence, determine the transmit power of D2D communication.
  • the determining unit is further configured to: obtain a power offset amount
  • the determining unit is specifically configured to determine, according to the uplink transmit power parameter, a transmit bandwidth of the D2D communication, a downlink path loss estimate, and the power offset amount, determine the transmit of the D2D communication. Power; or
  • the determining unit is specifically configured to determine a transmit power of the D2D communication as follows:
  • the determining unit is further configured to: determine, according to the transmit power of the D2D communication, a number of transmissions or a number of retransmissions; Specifically, the method is configured to: transmit D2D data according to the determined number of transmissions and the transmit power of the D2D communication; or transmit D2D according to the determined number of retransmissions and the transmit power of the D2D communication. data.
  • the determining unit is specifically configured to determine the number of transmissions or the number of retransmissions as follows:
  • the second correspondence is a correspondence between the transmission power of the D2D communication and the number of transmissions, or a correspondence between the transmission power of the D2D communication and the number of retransmissions relationship.
  • the transmitting unit is further configured to:
  • the transmission number information is used by the second user terminal to receive data according to the transmission times information, and the second user terminal is a terminal that performs D2D communication with the first user terminal;
  • a network device includes a determining unit and a sending unit, where
  • the determining unit is configured to determine an uplink transmit power parameter, where the uplink transmit power parameter is used by the first user terminal of the device-to-device D2D communication to determine the transmit power of the D2D communication according to the downlink path loss and the uplink transmit power parameter.
  • the determining unit is further configured to: determine a power offset amount
  • the sending unit is further configured to: send the power offset amount;
  • the power offset is used by the first user terminal to determine a transmit power of the D2D communication according to the power offset, the downlink path loss estimate, and the uplink transmit power parameter.
  • the determining unit is further configured to: determine a transmission bandwidth of the D2D communication;
  • the sending unit is further configured to: deliver an emission bandwidth of the D2D communication
  • the transmit bandwidth of the D2D communication is used by the first user terminal to determine an uplink transmit power according to a transmit bandwidth of the D2D communication, the downlink path loss estimate, and the uplink transmit power parameter.
  • the determining unit is further configured to: determine a modulation format of the D2D communication;
  • the sending unit is further configured to: deliver a modulation format of the D2D communication
  • the modulation format of the D2D communication is used by the first user terminal to determine an uplink transmit power according to the modulation format of the D2D communication, the downlink path loss estimation, and the uplink transmit power parameter.
  • a communication method including:
  • the first user terminal transmits D2D data according to the transmit power of the D2D communication.
  • the first user terminal determines, according to the uplink transmit power parameter and the downlink path loss estimate, a transmit power of the D2D communication, including:
  • the first user terminal determines an uplink transmit power according to the uplink transmit power parameter, a transmit bandwidth of the D2D communication, and the downlink path loss estimate, and determines a transmit power of the D2D communication according to the uplink transmit power; or
  • the first user terminal determines an uplink transmit power according to the uplink transmit power parameter, a transmit bandwidth of the D2D communication, a modulation format of the D2D communication, and a downlink path loss estimation, and determines a transmit power of the D2D communication according to the uplink transmit power.
  • determining, according to the uplink transmit power, a transmit power of the D2D communication including:
  • the first user terminal determines the uplink transmit power as the transmit power of the D2D communication.
  • determining, according to the uplink transmit power, a transmit power of the D2D communication including:
  • Determining, by the first user terminal, the power level to which the uplink transmit power belongs includes: determining, by the first user terminal, a modulation format of the D2D communication;
  • the first user terminal determines an uplink transmit power according to an uplink transmit power parameter, a transmit bandwidth of the D2D communication, a modulation format of the D2D communication, and a downlink path loss estimation, and determines a modulation format of the uplink transmit power corresponding to the D2D communication.
  • Determining, by the first user terminal, the transmit power of the D2D communication according to the first correspondence including: The first user terminal determines the transmit power of the D2D communication according to the correspondence between the uplink transmit power, the modulation format of the D2D communication, and the power level in each modulation format and the transmit power of the D2D communication.
  • the method further includes:
  • the first user terminal acquires a power offset amount
  • Determining, by the first user terminal, the transmit power of the D2D communication according to the uplink transmit power parameter and the downlink path loss estimate including:
  • the transmit power parameter determines the transmit power of the D2D communication.
  • the first user terminal determines, according to the uplink transmit power parameter and the downlink path loss estimate, a transmit power of the D2D communication, including:
  • the method further includes:
  • the first user terminal transmitting data according to the determined transmit power of the D2D communication, including: the first user terminal transmitting D2D data according to the determined number of transmissions and the transmit power of the D2D communication; or The first user terminal transmits D2D data according to the determined number of retransmissions and the transmit power of the D2D communication.
  • the first user terminal determines the number of transmissions or the number of retransmissions according to the transmit power of the D2D communication, and includes: the first user terminal Determining, according to the second correspondence, the number of transmissions or the number of retransmissions, where the second correspondence is a correspondence between the transmission power of the D2D communication and the number of transmissions, or a correspondence between the transmission power of the D2D communication and the number of retransmissions relationship.
  • the method further includes:
  • the first user terminal transmits retransmission times information, where the retransmission times information is used by the second user terminal to receive data according to the retransmission times information, and the second user terminal performs D2D with the first user terminal.
  • Communication terminal The first user terminal transmits retransmission times information, where the retransmission times information is used by the second user terminal to receive data according to the retransmission times information, and the second user terminal performs D2D with the first user terminal.
  • a communication method including:
  • the network device determines an uplink transmit power parameter
  • the network device sends the uplink transmit power parameter, where the uplink transmit power parameter is used by the first user terminal for device-to-device D2D communication to determine the transmit power of the D2D communication according to the downlink path loss estimate and the uplink transmit power parameter.
  • the method further includes:
  • the power offset is used by the first user terminal to determine a transmit power of the D2D communication according to the power offset, the downlink path loss estimate, and the uplink transmit power parameter.
  • the method further includes: The network device determines and delivers a transmission bandwidth of the D2D communication;
  • the transmit bandwidth of the D2D communication is used by the first user terminal to determine an uplink transmit power according to the transmit bandwidth of the D2D communication, the downlink path loss estimate, and the uplink transmit power parameter.
  • the method further includes:
  • the network device determines and delivers a modulation format of the D2D communication
  • the modulation format of the D2D communication is used by the first user terminal to determine an uplink transmit power according to the modulation format of the D2D communication, the downlink path loss estimate, and the uplink transmit power parameter.
  • the seventh aspect provides a communication system, where the communication system includes a network device and a user terminal, where the network device is a network device provided by any implementation manner of the fourth aspect, where the user terminal is implemented by any one of the third aspects.
  • User terminal provided by way.
  • the first UE of the D2D communication determines the transmit power for performing D2D communication according to the downlink path loss estimation and the received uplink transmit power parameter, that is, the first D2D communication in the prior art.
  • the UE transmits the D2D data at the maximum transmit power.
  • the transmit power of the D2D communication in the embodiment of the present invention is determined by using the downlink path loss estimation, so that the D2D signal of the first UE of the D2D communication experiences the received power of the network device after the fading of the channel.
  • the received power of the uplink signal of the first UE to the network device is not higher than the received power of the uplink signal of the first UE, and the received power of the D2D signal of the first UE of the D2D communication and the received power of the uplink signal of the other UE arrives at the network device. Rather, it can reduce or avoid in-band leakage interference, and will not affect the reception of uplink signals of other UEs, thereby reducing the impact of D2D communication on uplink communication.
  • Figure 1 is a schematic diagram of a communication process of a D2D communication system
  • FIG. 2 is a schematic structural diagram of a communication device according to Embodiment 1 of the present invention
  • 3 is a schematic structural diagram of a communication device according to Embodiment 2 of the present invention
  • FIG. 4 is a schematic structural diagram of a user terminal according to Embodiment 3 of the present invention.
  • FIG. 5 is a schematic structural diagram of a network device according to Embodiment 4 of the present invention.
  • FIG. 6 is a schematic structural diagram of a communication system according to Embodiment 5 of the present invention.
  • FIGS. 7A-7E are flowcharts of a communication method according to Embodiment 6 of the present invention.
  • Embodiment 8 of the present invention is a flowchart of a communication method according to Embodiment 8 of the present invention.
  • FIG. 10 is a flowchart of a communication method according to Embodiment 9 of the present invention. detailed description
  • the communication method and device provided by the embodiments of the present invention are applied to the D2D communication technology, and the D2D communication technology can be applied to various communication scenarios, such as LTE, 2G, or 3G.
  • a schematic diagram of the process of performing D2D communication can be referred to FIG. 1.
  • UE1 communicates with a network device, UE1 transmits communication data, and network device receives communication data.
  • the process of transmitting communication data and UE1 receiving communication data is called downlink. Communication.
  • the network device performs power control on the uplink transmit power when the UE1 performs uplink communication, and the target is that the received power of the uplink signal of the UE1 received by the network device is equivalent to the received power of the uplink signal of other UEs received by the network device.
  • the uplink transmit power referred to in the following embodiments refers to the transmit power between the UE and the network device.
  • the UE1 is a data transmitting party, and the communication between the UE and the UE performed by the UE2 and the UE3 is D2D communication, and the UE1 adjusts the transmit power of the D2D communication.
  • the UE1 adjusts the transmit power control of the D2D communication, according to the UE1 and the network.
  • the uplink transmit power when the device performs uplink communication determines the transmit power of the D2D communication, and transmits the D2D data according to the determined transmit power of the D2D communication.
  • the transmit power of the D2D communication of the UE1 is determined according to the uplink transmit power of the UE1 to the network device,
  • the received signal of the UE 2 for D2D communication and the uplink signal of other UEs are equivalent to the received power when the network device is reached, and the in-band leakage for the uplink communication of other UEs and the network device is reduced as much as possible to improve system performance.
  • the network device in the embodiment of the present invention may be an evolved base station (eNB) in an LTE system, or a base station (NB) in a Universal Mobile Telecommunications System (UMTS).
  • eNB evolved base station
  • NB base station
  • UMTS Universal Mobile Telecommunications System
  • the eNB in the LTE system is used as an example for the network device to communicate with the UE and perform resource scheduling for the UE.
  • eNB evolved base station
  • NB Universal Mobile Telecommunications System
  • the UE that transmits the D2D data in the D2D communication is referred to as the first UE, and the first UE adjusts the transmit power of the D2D communication, and the UE that receives the D2D data transmitted by the first UE in the D2D communication is called Is the second UE.
  • the first embodiment of the present invention provides a communication device 100.
  • the communication device 100 can perform the method steps of the sixth embodiment to the ninth embodiment.
  • FIG. 2 is a schematic structural diagram of a communication device according to an embodiment of the present invention. As shown in FIG. 2, the communication device includes a transceiver 11, a processor 12, a memory 13 and a bus 14, wherein the transceiver 11, the processor 12, and the memory 13 are all connected to a bus 14, wherein the memory 13 is used for storage processing. Program code executed by the device 12;
  • the processor 12 is configured to call a program stored in the memory 13, obtain an uplink transmit power parameter, and determine a transmit power of the D2D communication according to the uplink transmit power parameter and a downlink path loss estimate; and control a transmit power of the transceiver 11 according to the D2D communication. Transmitting D2D data;
  • the transceiver 11 is configured to receive an uplink transmit power parameter transmitted by the network device, and transmit the D2D data according to the transmit power of the D2D communication determined by the processor 12.
  • the uplink transmit power parameter may be received by the transceiver 11, and the processor 12 may obtain the uplink transmit power parameter from the transceiver 11. Alternatively, the processor 12 may obtain the uplink transmit power parameter from the memory 13, the memory. 13 stores the upper portion of the transceiver 11 received in advance Line transmit power parameters.
  • the processor 12 determines the transmit power of the D2D communication as follows:
  • the uplink transmit power is determined according to the uplink transmit power parameter, the transmit bandwidth of the D2D communication, the modulation format of the D2D communication, and the downlink path loss estimate, and the transmit power of the D2D communication is determined according to the uplink transmit power.
  • the processor 12 is specifically configured to determine, according to the uplink transmit power, the transmit power of the D2D communication according to the following manner: using the uplink transmit power as the D2D communication Transmit power.
  • the processor 12 is specifically configured to determine, according to the uplink transmit power, the transmit power of the D2D communication according to the following manner: determining a power level to which the uplink transmit power belongs ; as well as
  • the first correspondence is stored in the memory 13, and may be pre-configured to the user terminal, or the transceiver 11 may be stored in the memory 13 after being received from the network device.
  • the correspondence mentioned in the following text is similar to this and will not be described again.
  • the processor 12 is specifically configured to determine, according to the manner, the power level to which the uplink transmit power belongs: determine a modulation format of the D2D communication, and determine an uplink. The power level to which the transmit power corresponds to the modulation format corresponding to the D2D communication;
  • the transmit power of the D2D communication is determined according to the correspondence between the uplink transmit power, the modulation format of the D2D communication, and the power level in each modulation format and the transmit power of the D2D communication.
  • the transceiver 11 is further configured to: obtain a power offset amount;
  • the processor 12 is specifically configured to determine, according to the following manner, the transmit power of the D2D communication: determining, according to an uplink transmit power parameter, a transmit bandwidth of the D2D communication, a downlink path loss estimation, and a power offset, a transmit power of the D2D communication; or
  • the transmit power of the D2D communication is determined according to the uplink transmit power parameter, the transmit bandwidth of the D2D communication, the modulation format of the D2D communication, the downlink path loss estimate, and the power offset.
  • the processor 12 is specifically configured to determine the transmit power of the D2D communication as follows:
  • the processor 12 is further configured to:
  • the transceiver 11 is specifically configured to transmit D2D data as follows:
  • D2D data is transmitted according to the determined number of transmissions and the transmission power of the D2D communication; or D2D data is transmitted according to the determined number of retransmissions and the transmission power of the D2D communication.
  • the processor 12 is specifically configured to determine the number of transmissions or the number of retransmissions as follows:
  • the number of transmissions or the number of retransmissions is determined according to the second correspondence, and the second correspondence is a correspondence between the transmission power of the D2D communication and the number of transmissions, or a correspondence between the transmission power of the D2D communication and the number of retransmissions.
  • the transceiver 11 is further configured to:
  • the transmission frequency information is used by the second user terminal according to the transmission frequency Receiving data
  • the second user terminal is a terminal performing D2D communication with the first user terminal; or transmitting retransmission times information, the retransmission times information is used by the second user terminal to receive data according to the retransmission times information, and the second user terminal It is a terminal that performs D2D communication with the first user terminal.
  • the transceiver 11 is configured to:
  • the transmission number information or the retransmission times information is transmitted.
  • the transmit power of the D2D communication when determining, by the communication device, the transmit power of the D2D communication, determining, according to the downlink path loss estimation and the received uplink transmit power parameter, the transmit power of performing D2D communication, that is, the first UE of the D2D communication in the prior art.
  • the D2D data is transmitted at the maximum transmit power.
  • the transmit power of the D2D communication in the embodiment of the present invention is determined by using the downlink path loss estimation, so that the D2D signal of the D2D communication UE undergoes the fading of the channel and the received power of the network device is not high.
  • the received power of the uplink signal of the uplink communication of the UE to the network device can ensure that the received power of the D2D signal of the D2D communication UE reaches the network device is equivalent to the received power of the uplink signal of the other UE to the network device, and can be reduced or avoided.
  • the internal leakage interference does not affect the reception of uplink signals of other UEs, thereby reducing the impact of D2D communication on uplink communication.
  • FIG. 3 is a schematic diagram of a communication device 200 according to Embodiment 2 of the present invention.
  • the communication device 200 includes a transceiver 21, a processor 22, a memory 23, and a bus 24, wherein the transceiver 21, the processor 22, and the memory 23 are all connected to the bus 24, wherein
  • a memory 23, configured to store program code executed by the processor 22;
  • the processor 22, the program stored in the memory 23 is used to determine the uplink transmit power parameter; the transceiver 21 is configured to send the uplink transmit power parameter determined by the processor 22, and the uplink transmit power parameter is used for the device-to-device D2D communication.
  • a user terminal determines a transmit power of the D2D communication according to a downlink path loss and an uplink transmit power parameter.
  • the processor 22 is further configured to: determine work Rate offset
  • the transceiver 21 is further configured to: send a power offset amount
  • the power offset is used by the first user terminal to determine the transmit power of the D2D communication according to the power offset, the downlink path loss estimate, and the uplink transmit power parameter.
  • the processor 22 is further configured to: determine a transmission bandwidth of the D2D communication;
  • the transceiver 21 is further configured to: deliver a transmit bandwidth of the D2D communication;
  • the transmit bandwidth of the D2D communication is used by the first user terminal to determine the uplink transmit power according to the transmit bandwidth, the downlink path loss estimate, and the uplink transmit power parameter of the D2D communication.
  • the processor 22 is further configured to: determine a modulation format of the D2D communication;
  • the transceiver 21 is further configured to: deliver a modulation format of the D2D communication;
  • the modulation format of the D2D communication is used by the first user terminal to determine the uplink transmit power according to the modulation format of the D2D communication, the downlink path loss estimation, and the uplink transmit power parameter.
  • the transceiver 21 uses at least one of a broadcast mode, a radio resource control protocol RRC signaling mode, and a physical layer signaling control mode.
  • the power offset is issued.
  • the communication device sends an uplink transmit power parameter, a power offset, a transmit bandwidth of the D2D communication, or a modulation format of the D2D communication, and the like, so that when the UE performing the D2D communication performs the transmit power of the D2D communication, according to the downlink
  • the path loss estimation and the received uplink transmit power parameter determine the transmit power of the D2D communication, that is, the D2D data is transmitted by the first UE of the D2D communication in the prior art at the maximum transmit power, and the transmit power of the D2D communication in the embodiment of the present invention is
  • the downlink path loss estimation is used to determine that the D2D signal of the D2D communication UE undergoes the fading of the channel and the received power of the network device is not higher than the received power of the uplink signal of the UE for uplink communication, which can be guaranteed.
  • the receiving power of the D2D signal of the D2D communication UE to the network device is equivalent to the receiving power of the uplink signal of the other UE to the network device, which can reduce or avoid the in-band leakage interference, and does not affect the receiving of the uplink signal of other UEs, thereby reducing D2D communication Impact on upstream communications.
  • the third embodiment of the present invention provides a UE 300, which is used to perform the method flow of the sixth embodiment to the eighth embodiment.
  • FIG. 4 is a schematic diagram of the structure of the UE 300 according to the embodiment of the present invention.
  • the UE 300 provided by the embodiment of the present invention includes: a receiving unit 31, a determining unit 32, and a transmitting unit 33, where
  • the determining unit 32 is configured to obtain an uplink transmit power parameter, and determine, according to the downlink path loss estimation and the uplink transmit power parameter received by the receiving unit 31, the transmit power of the D2D communication;
  • the transmitting unit 33 is configured to transmit D2D data according to the transmit power of the D2D communication determined by the determining unit 32.
  • the UE 300 provided by the embodiment of the present invention may further include a storage unit (not shown), where the storage unit may be configured to store an uplink transmit power parameter, and the determining unit 32 is configured to obtain an uplink transmit power parameter from the storage unit, where The uplink transmit power parameter stored by the storage unit is received by the receiving unit 31 from the network device.
  • a storage unit not shown
  • the storage unit may be configured to store an uplink transmit power parameter
  • the determining unit 32 is configured to obtain an uplink transmit power parameter from the storage unit, where The uplink transmit power parameter stored by the storage unit is received by the receiving unit 31 from the network device.
  • the receiving unit 31 is configured to receive an uplink transmit power parameter that is sent by the network device, and determine, by the determining unit 32, an uplink transmit power parameter.
  • the determining unit 32 is specifically configured to determine the transmit power of the D2D communication as follows:
  • the uplink transmit power is determined according to the uplink transmit power parameter, the transmit bandwidth of the D2D communication, the modulation format of the D2D communication, and the downlink path loss estimate, and the transmit power of the D2D communication is determined according to the uplink transmit power.
  • the determining unit 32 is specifically configured to determine, according to the uplink transmit power, the transmit power of the D2D communication according to the following manner: the uplink transmit power is used as the D2D communication. Transmit power.
  • the determining unit 32 determining, according to the uplink transmit power, determining, according to the uplink transmit power, a transmit power of the D2D communication: determining a power level to which the uplink transmit power belongs;
  • the transmit power of the D2D communication is determined according to the first correspondence, and the first correspondence is a correspondence between the power level and the transmit power of the D2D communication.
  • the determining unit in combination with the third implementation manner of the foregoing third embodiment, in the fourth implementation manner, the determining unit
  • determining, according to the manner, a power level to which the uplink transmit power belongs determining, according to the manner, a power level to which the uplink transmit power belongs: determining a modulation format of the D2D communication, and determining a power level to which the uplink transmit power belongs in a modulation format corresponding to the D2D communication;
  • the determining unit 32 is specifically configured to determine, according to the manner, a power level to which the uplink transmit power belongs: a correspondence between an uplink transmit power, a modulation format of the D2D communication, and a power level in each modulation format and a transmit power of the D2D communication. Relationship, determining the transmit power of D2D communication.
  • the determining unit 32 is further configured to: obtain a power offset
  • the determining unit 32 is specifically configured to determine, according to the following manner, the transmit power of the D2D communication: determining, according to an uplink transmit power parameter, a transmit bandwidth of the D2D communication, a downlink path loss estimate, and a power offset, a transmit power of the D2D communication; or
  • the transmit power of the D2D communication is determined according to the uplink transmit power parameter, the transmit bandwidth of the D2D communication, the modulation format of the D2D communication, the downlink path loss estimate, and the power offset.
  • the power offset amount may be stored in the storage unit, and the determining unit 32 obtains the power offset amount from the storage unit.
  • the power offset amount may be received by the receiving unit 31 from the network device, and the determining unit is The power offset amount is obtained from the receiving unit 31.
  • the determining unit 32 is specifically configured to determine the transmit power of the D2D communication as follows:
  • the uplink transmit power parameter According to the uplink transmit power parameter, according to the uplink transmit power parameter and the D2D transmit function
  • the transmit bandwidth, the modulation format of the D2D communication, and the downlink path loss estimate determine the transmit power of the D2D communication.
  • the corresponding relationship may be pre-configured into the storage unit, and the determining unit obtains the corresponding relationship from the storage unit, or the corresponding relationship may be received by the receiving unit from the network device, and the determining unit is received from the receiving unit. Get the corresponding relationship.
  • Other correspondences in this embodiment may also be similar to this, and are not described herein again.
  • the determining unit 32 is further configured to: determine, according to the transmit power of the D2D communication, the number of transmissions or the number of retransmissions; the transmitting unit 33, specifically The D2D data is transmitted as follows: D2D data is transmitted according to the determined number of transmissions and the transmission power of the D2D communication; or D2D data is transmitted according to the determined number of retransmissions and the transmission power of the D2D communication.
  • the number of transmissions or the number of retransmissions is determined according to the second correspondence, and the second correspondence is a correspondence between the transmission power of the D2D communication and the number of transmissions, or a correspondence between the transmission power of the D2D communication and the number of retransmissions.
  • the transmitting unit 33 is further configured to:
  • the transmission times information is used by the second UE to receive data according to the transmission times information, and the second UE is a terminal that performs D2D communication with the first UE; or
  • the retransmission times information is used by the second UE to receive data according to the retransmission times information, and the second UE is a terminal that performs D2D communication with the first UE.
  • the transmitting unit In combination with the ninth implementation manner of the foregoing third embodiment, in the tenth implementation manner, the transmitting unit
  • the information about the transmission times or the number of retransmissions is transmitted as follows:
  • the transmission number information or the retransmission times information is transmitted.
  • the UE provided in the embodiment of the present invention determines the transmit power of performing D2D communication according to the downlink path loss estimation and the received uplink transmit power parameter when determining the transmit power of the D2D communication, that is, compared to the D2D communication in the prior art.
  • the UE transmits the D2D data at the maximum transmit power.
  • the transmit power of the D2D communication in the embodiment of the present invention is determined by using the downlink path loss estimation, so that the D2D signal of the D2D communication UE experiences the received power of the network device after the channel fading.
  • the received power of the uplink signal of the uplink communication of the UE to the network device can ensure that the received power of the D2D signal of the UE of the D2D communication arrives at the network device is equal to the received power of the uplink signal of the other UE, and can be reduced or avoided.
  • In-band leakage interference does not affect the reception of uplink signals of other UEs, thereby reducing the impact of D2D communication on uplink communication.
  • the fourth embodiment of the present invention provides a network device 400, which is used to perform the method flow of the following ninth embodiment, and FIG. 5 is a schematic structural diagram of the network device 400 according to the fourth embodiment of the present invention.
  • the network device 400 includes a determining unit 41 and a sending unit 42, where
  • a determining unit 41 configured to determine an uplink transmit power parameter
  • the sending unit 42 is configured to send the uplink transmit power parameter determined by the determining unit 41, and the uplink transmit power parameter is used by the first UE for device-to-device D2D communication to determine the transmit power of the D2D communication according to the downlink path loss and the uplink transmit power parameter.
  • the determining unit 41 is further configured to: determine a power offset
  • the sending unit 42 is further configured to: send a power offset amount
  • the power offset is used by the first UE to determine the transmit power of the D2D communication according to the power offset, the downlink path loss estimate, and the uplink transmit power parameter.
  • the determining unit 41 is further configured to: determine a transmission bandwidth of the D2D communication;
  • the sending unit 42 is further configured to: deliver a transmission bandwidth of the D2D communication;
  • the transmission bandwidth of the D2D communication is used for the first UE according to the transmission bandwidth of the D2D communication
  • the path loss estimate and the uplink transmit power parameter determine the uplink transmit power
  • the sending unit 42 may issue only one or both of the power offset amount and the transmission bandwidth of the D2D communication. If the sending unit 42 only delivers the transmission bandwidth of the D2D communication, the first UE determines the uplink transmit power according to the transmit bandwidth, the downlink path loss estimate, and the uplink transmit power parameter of the D2D communication, does not use the power offset, or uses the pre-configured The power offset can be implemented. If the sending unit 42 only sends the power offset, the first UE determines whether the uplink transmit power can use the transmit bandwidth of the pre-configured D2D communication, or uses other pre-configured bandwidth values. .
  • the determining unit 41 is further configured to: determine a modulation format of the D2D communication;
  • the sending unit 42 is further configured to: deliver a modulation format of the D2D communication
  • the modulation format of the D2D communication is used by the first UE to determine the uplink transmit power according to the modulation format of the D2D communication, the downlink path loss estimation, and the uplink transmit power parameter.
  • the sending unit 42 is specifically configured to send the power offset amount as follows: ⁇ broadcast mode, radio resource control protocol RRC letter
  • the power offset is sent in at least one of a mode and a physical layer signaling control mode.
  • the transmission bandwidth of the communication or the modulation format of the D2D communication is performed, so that when the UE performing D2D communication performs the transmission power determination of the D2D communication, the transmission power of the D2D communication is determined according to the downlink path loss estimation and the received uplink transmission power parameter. That is, the D2D communication is transmitted with the maximum transmit power of the UE in the D2D communication in the prior art.
  • the transmit power of the D2D communication in the embodiment of the present invention is determined by using the downlink path loss estimation, so that the D2D signal of the D2D communication UE experiences the channel fading.
  • the received power of the network device that arrives at the network is not higher than the received power of the uplink signal of the UE for uplink communication, and the received power of the D2D signal of the D2D communication UE and the uplink signal of the other UE arrive at the network device.
  • the receiving power is equivalent, which can reduce or avoid in-band leakage interference, and will not affect the reception of uplink signals of other UEs, thereby reducing the uplink of D2D communication. The impact of communication.
  • the fifth embodiment of the present invention provides a communication system 500.
  • the communication system 500 includes the UE 300 and the network device 400 according to the fourth embodiment.
  • FIG. 6 is a schematic diagram of a communication system according to an embodiment of the present invention.
  • the UE and the network device included in the communication system provided by the embodiment of the present invention have all the functions involved in the foregoing embodiments. For details, refer to the related description of the foregoing embodiments, and details are not described herein again.
  • the UE when determining the transmit power of the D2D communication, determines the transmit power of the D2D communication according to the downlink path loss estimation and the received uplink transmit power parameter, that is, the D2D communication in the prior art.
  • the UE transmits the D2D data with the maximum transmit power.
  • the transmit power of the D2D communication in the embodiment of the present invention is determined by using the downlink path loss estimation, so that the D2D signal of the D2D communication UE experiences the channel power and the received power of the network device does not arrive.
  • the received power of the uplink signal of the UE for uplink communication reaches the network device, and the received power of the D2D signal of the UE for D2D communication to the network device is equal to the received power of the uplink signal of the other UE to the network device. It can reduce or avoid in-band leakage interference, and will not affect the reception of uplink signals of other UEs, thereby reducing the influence of D2D communication on uplink communication.
  • FIG. 7A is a flowchart of the implementation of the communication method according to the embodiment of the present invention.
  • the execution entity of the communication method shown in FIG. 7A is an example of the first UE. As shown in FIG. 7A, the method includes:
  • the first UE acquires an uplink transmit power parameter.
  • the first UE determines a transmit power of the D2D communication according to the downlink path loss estimation and the received uplink transmit power parameter.
  • the first UE transmits D2D data according to the transmit power of the D2D communication determined in S102.
  • the first UE For the first UE to obtain the uplink transmit power parameter, refer to the foregoing description, which is not described in this embodiment.
  • the first UE may perform D2D communication between the first UE and the second UE, or uplink communication between the first UE and the network device, to determine the transmit power of the corresponding link.
  • the uplink transmit power parameter may be delivered by the network device.
  • the D2D communication of the UE may have a maximum transmission power limit, and the transmission power p of the D2D communication does not exceed the maximum transmission power.
  • the maximum transmission power of the D2D communication is 15 " ⁇ may be predefined or sent by the network side when the UE is degraded according to the downlink path.
  • the estimated transmit power p of the D2D communication determined by the uplink transmit power parameter is greater than the maximum transmit power of the D2D communication 15 " ⁇ , the UE selects the maximum transmit power of the D2D communication» as the transmit power of the final D2D communication.
  • the received power of the D2D communication signal of the UE to the network device is smaller than the received power of the uplink signal of the other UE to the network device, and the D2D communication signal of the UE does not affect the uplink communication.
  • the maximum transmit power of the D2D communication with a smaller value is selected to avoid
  • the in-band leakage of other UE uplink signals further reduces the impact on the uplink communication, and the D2D data transmission is performed by using the maximum transmission power of the D2D communication, which can ensure the normal operation of the D2D communication and save the UE's transmission power.
  • the network device may be delivered in a unicast manner, for example, by using RRC (radio resource control) signaling or physical layer signaling, or by using a combination of broadcast and unicast. .
  • the following manner when determining the transmit power of the D2D communication according to the downlink path loss estimation and the uplink transmit power parameter, the following manner may be preferred:
  • First way S102a The first UE determines an uplink transmit power according to an uplink transmit power parameter, a transmit bandwidth of the D2D communication, and a downlink path loss estimate, and determines a transmit power of the D2D communication according to the uplink transmit power.
  • the first UE determines the uplink transmit power according to the uplink transmit power parameter, the transmit bandwidth of the D2D communication, and the downlink path loss estimate.
  • the uplink transmit power is any method for setting the uplink transmit power by the slow open loop power control and the fast closed loop power control. For example, for the serving cell c, only the physical uplink shared channel is in the subframe i ( When the uplink data of the Physical Uplink Shared Channel, PUSCH is transmitted, the uplink transmit power determining mechanism can refer to formula (1):
  • -p ⁇ 3 ⁇ 4 /') and O) are configuration parameters for the upper layer;
  • ') is the transmission bandwidth of the uplink communication, and is the downlink path loss estimate between the UE and the network device of the serving cell c;
  • fc (' ⁇ ) fc (' ⁇ - ⁇ ) + ⁇ PUSCHp (' ⁇ - PUSCH) or
  • fc (' ⁇ ) ⁇ PUSCH,c (' ⁇ - PUSCH)
  • ⁇ PUSCHp is the power adjustment value, which is a sub-frame offset;
  • K s Q , BPRE and P t are parameters required for both control signaling and data to be transmitted on the PUSCH.
  • the power adjustment value ⁇ USCHP refers to the dynamic inclusion of the physical downlink control channel.
  • DCI Downlink Control Information
  • PDCCH Physical Downlink Control Channel
  • PDCCH enhanced physical downlink control channel
  • TPC Transmission Power Control
  • ⁇ USCHP can select the cumulative value according to the high-level setting parameter Accumulation-enabled (accumulated value activation parameter) (accumulate power based on the previous sub-frame ⁇ ('XG - D + ⁇ PUSCH ⁇ ' - ⁇ PUSCH)) Or absolute value
  • the uplink transmit power parameter includes the high layer configuration parameter P. PUSC . /), and deltaMCS-Enable, and physical layer configuration parameters. P. PUSC . /), a c (j) .
  • the deltaMCS-Enable and the network device are set according to the actual communication situation and transmitted by the network device to the UE.
  • the transmission bandwidth of the D2D communication ⁇ " ⁇ ') is pre-defined or scheduled from the eNB, and the downlink path loss is estimated by the UE.
  • the transmission bandwidth used for determining the uplink transmission power is the transmission bandwidth of the D2D communication, and Instead of using the transmission bandwidth Mpus ⁇ ( ) of the uplink communication in the above formula, the calculated uplink transmission power can ensure that the received power of the actually transmitted D2D signal arriving at the network device is not higher than the uplink of the first UE for uplink communication.
  • the received power of the signal to the network device can ensure that the received power of the D2D signal of the first UE arrives at the network device and the received signal of the uplink signal of the other UE arrives at the network device.
  • the rate is equivalent, which can reduce or avoid in-band leakage interference, and will not affect the reception of uplink signals of other UEs.
  • ⁇ is a downlink path loss estimation obtained by the UE through measurement, which is also different from the path loss estimation of the D2D communication when determining the transmit power of the D2D communication in the prior art, thereby reducing the D2D communication pair.
  • the used transmit bandwidth p usc 3 ⁇ 4 c (for pre-defined or from the eNB)
  • the transmission bandwidth of the D2D communication obtained by scheduling is different from the current
  • the UE estimates the downlink path loss obtained by the measurement.
  • the first UE of the D2D communication is calculated based on the transmission bandwidth and downlink path loss estimation of the D2D communication when calculating the uplink transmission power.
  • the purpose of the present invention is to reduce the impact of D2D communication on uplink communication, when the transmit power of the D2D communication determined by the first UE according to the downlink path loss estimation and the uplink transmit power parameter is greater than the transmit power of the D2D communication. Selecting the maximum transmit power of D2D communication with smaller value, avoiding in-band leakage of other UE uplink signals, further reducing the impact, and transmitting the D2D data with the maximum transmit power of D2D communication, which can ensure the normal D2D communication. Perform, save the UE's transmit power.
  • the determined uplink transmit power may be directly used as the transmit power of the D2D communication, and the uplink transmit power may be quantized to determine the transmit power of the D2D communication.
  • the uplink transmit power is preferably quantized.
  • the uplink transmit power is quantized and the transmit power of the D2D communication is determined as follows:
  • the transmit power of the D2D communication may be determined according to the correspondence between the power level and the transmit power of the D2D communication.
  • the correspondence between the power level and the transmission power of the D2D communication is referred to as a first correspondence.
  • the first correspondence relationship may be preset, and the preset first correspondence relationship may be as shown in Table 3.
  • P mm , P l is the separation point (or called quantization point) of the system's predefined power level.
  • P mm > 0, P max can be equal to the rated transmit power of the UE.
  • the specific value can be Configured or pre-defined by the network device.
  • the separation point can be set based on the empirical value.
  • the first UE calculates the uplink transmit power as P according to the uplink transmit power parameter and the uplink transmit power determining mechanism. After determining the uplink transmit power p, the power level to which the uplink transmit power p belongs may be determined. Within a certain level, D2D communication uses a uniform transmit power.
  • the uplink transmit power P when the uplink transmit power P is satisfied Then, it can be determined that the transmit power of the D2D communication is P N , and the UE transmits the D2D data according to the transmit power.
  • the transmit power of the D2D communication of the first UE is equivalent to the uplink transmit power of the first UE, and the received power of the D2D signal of the first UE and the uplink signal of the other UE may be ensured to reach the network device.
  • the received power is equivalent, which can reduce or avoid in-band leakage interference.
  • the value of the transmit power of the D2D communication of the first UE can be further limited, and the coverage of the D2D signal of the first UE is limited, thereby facilitating subsequent compensation of the coverage.
  • the power level division may be divided according to actual conditions, for example, a plurality of power levels may be divided, so that the D2D communication power adjustment is finer, or a smaller number of power levels may be divided, for example, The two levels are divided so that the transmission power of the D2D communication is less, which facilitates the reception processing of the second UE of the D2D communication.
  • the first UE that performs the D2D communication may be transmitted according to a smaller power, where the minimum power is the maximum power that does not affect the system; or the UE is in the UE that is sent by the network device.
  • the transmission power is adjusted in the case where the upper limit of the maximum transmission power of the D2D communication is performed. Further, the size of the transmit power may also be related to the modulation format. When the D2D transmission of the same UE uses different modulation formats, the transmit power may also be different, so when the modulation format of the first UE of the D2D communication is variable, A UE may determine the transmit power of the D2D communication according to a modulation format of the D2D communication used by the first UE.
  • the first UE may determine the uplink transmit power according to the uplink transmit power parameter of the first UE, the transmit bandwidth of the D2D communication, the modulation format of the D2D communication, and the downlink path loss estimation according to the uplink transmit power determining mechanism. And determining the transmit power of the D2D communication according to the determined uplink transmit power.
  • the determined uplink transmit power may be directly used as the transmit power of the D2D communication, and the uplink transmit power may be quantized to determine the transmit power of the D2D communication.
  • Table 4 The correspondence between the power level under and the transmit power of D2D communication is shown in Table 4:
  • the first UE performing D2D communication needs to adopt the uplink transmit power parameter delivered by the network device, the transmit bandwidth of the D2D communication, and the modulation of the D2D communication.
  • the format and downlink path loss estimation determine the uplink transmit power according to the uplink transmit power determining mechanism, and the power level to which the uplink transmit power belongs in the modulation format of the corresponding D2D communication.
  • the first UE may determine the uplink transmit power according to the transmit bandwidth of the D2D communication, the modulation format of the D2D communication, the downlink path loss estimation, and the uplink transmit power parameter transmitted by the network device.
  • the first UE may determine whether the transmit power is related to the modulation format according to the deltaMCS-Enabled transmitted by the network device.
  • the deltaMCS-Enabled When the deltaMCS-Enabled is not activated, indicating that the transmit power is independent of the modulation format, when determining the uplink transmit power, When the deltaMCS-Enabled is activated, it indicates that the transmit power is related to the modulation format.
  • the first UE performs the uplink transmit power determination, it can combine the uplink transmit power parameter, the transmit bandwidth of the D2D communication, and the modulation format of the D2D communication.
  • the determined uplink transmit power is p Q psK
  • the P Q PSK satisfies ⁇ * - QPSK ⁇ QPSK ⁇ P i-QPSK , according to the power level in each modulation format shown in Table 4, and the correspondence between the power level in each modulation format and the transmission power of D2D communication, it can be seen that P mm-QPSK ⁇ PQPSK ⁇ P 1 -
  • the transmit power of the corresponding D2D communication in the QPSK class is Pm - QPSK
  • the transmit power of the D2D communication is determined to be Pm - Q psK
  • the first U E transmits D2D data according to the transmission power Pm - Q psK .
  • Different modulation formats correspond to different uplink transmit powers, because when the modulation formats are different, the uplink transmit powers are also used with different quantized values, which are adapted to the respective modulation formats.
  • the method for determining the transmit power of the D2D communication in the foregoing embodiment of the present invention is such that when the value of the transmit power of the D2D communication is within a certain range in a certain modulation format, the transmit power of the D2D communication of the first UE is made as high as possible.
  • the uplink transmit power of the uplink communication of the UE is equivalent, and the received power of the D2D signal of the first UE and the received signal of the uplink signal of the other UE may be ensured.
  • the rate is equivalent, reducing or avoiding in-band leakage interference, which can ensure that the impact of D2D communication on network uplink communication is minimized.
  • By quantizing the transmit power by further limiting the value of the transmit power of the D2D communication of the UE, the coverage of the D2D signal of the UE is limited, which facilitates subsequent compensation coverage.
  • the uplink power determination mechanism and parameters are partially used, and the power control parameters are not added for the D2D communication, and multiple sets of parameters are not notified (uplink transmission)
  • the complexity of the power parameters and the D2D transmit power parameters saves the power control signaling overhead of separately notifying D2D communication.
  • the first UE acquires a power offset quantity and receives an uplink transmit power parameter that is sent by the network device, where the first UE is configured according to an uplink transmit power parameter, a transmit bandwidth of the D2D communication, a downlink path loss estimate, and a obtained power offset. Quantity, determine the transmit power of D2D communication.
  • the network device may transmit the power offset and the uplink transmit power parameter to the UE in a broadcast or multicast manner, where the power offset transmitted by the network device is the uplink of the transmit power of the D2D communication.
  • a power offset of the transmit power can be used to notify high-level configuration parameters, or physical layer configuration parameters, or a combination of high-level configuration parameters and physical layer configuration parameters.
  • the high-level configuration parameter notifies a first offset
  • the physical layer configuration parameter notifies the second offset
  • the first UE obtains the power offset by using the first offset and the second offset; or The way of an offset or a second offset.
  • the amount of power offset in the embodiments of the present invention may also be predefined.
  • the power offset amount can be assumed to be ⁇ in the embodiment of the present invention, wherein ⁇ can be a positive number, a negative number or zero.
  • the first UE may determine the uplink transmit power according to the uplink transmit power parameter transmitted by the network device. For the specific determination process, refer to the process of determining the uplink transmit power involved in the first mode, which is not described herein again.
  • the transmit power of the D2D communication may be expressed as ⁇ + ⁇ , and the process of determining the transmit power of the D2D communication is relatively simple.
  • the embodiment of the present invention may also define a relatively complex nonlinear formula to determine the transmit power of the D2D communication.
  • the high-level configuration parameter of the uplink transmit power parameter in the embodiment of the present invention When the deltaMCS-Enabled is activated, the first UE determines the transmit power of the D2D communication according to the uplink transmit power parameter transmitted by the network device, the transmit bandwidth of the D2D communication, the modulation format of the D2D communication, the downlink path loss estimation, and the acquired power offset.
  • the first UE of the D2D communication determines the transmit power of the D2D communication according to the downlink path loss estimation and the received uplink transmit power parameter, that is, relative to the prior art.
  • the first UE of the D2D communication transmits the D2D data at the maximum transmit power.
  • the transmit power of the D2D communication in the embodiment of the present invention is determined by using the downlink path loss estimation, so that the D2D communication signal of the first UE of the D2D communication experiences the channel fading
  • the received power of the network device is not higher than the received power of the uplink signal of the first UE to the network device, and the D2D communication signal of the first UE of the D2D communication can reach the receiving power of the network device and the uplink of other UEs.
  • the received power of the signal arriving at the network device is equivalent, which can reduce or avoid in-band leakage interference, and does not affect the reception of uplink signals of other UEs, thereby reducing the influence of D2D communication on uplink communication.
  • the first UE determines the D2D transmit power parameter according to the preset correspondence relationship according to the uplink transmit power parameter transmitted by the network device, and determines the transmit of the D2D communication according to the determined D2D transmit power parameter, the transmit bandwidth of the D2D communication, and the downlink path loss estimate. power.
  • the first UE may perform the D2D communication according to the actual situation, or the traditional communication with the network device, and may use different interpretation modes for the uplink transmit power parameters sent by the network device, so the implementation of the present invention
  • the uplink transmit power parameter transmitted by the network device can be interpreted as the D2D transmit power parameter required for the D2D communication, and then the D2D communication is calculated according to the algorithm of the uplink transmit power. Transmit power.
  • the embodiment of the present invention is described by taking the example of the TPC as an example.
  • the USCH is shown in Table 1 and Table 2 after the TPC is interpreted.
  • the same TPC can be based on the preset correspondence. Whether uplink communication or D2D communication is interpreted as a different value, the preset correspondence relationship refers to specifically deciphering TPC as which USCH in D2D communication is pre-set, for example
  • Table 5 and Table 6 in the embodiment of the present invention add the D2D cumulative value ⁇ USCH ⁇ and the D2D absolute value ⁇ USCH ⁇ columns on the basis of Table 1 and Table 2, that is, Table 5 in the embodiment of the present invention.
  • Table 6 shows the values or states of the same TPC, which are interpreted as different USCH and C values for uplink communication and D2D communication, respectively.
  • the TPC is taken as an example for description.
  • other uplink transmit power parameters such as ⁇ -PUSCH ⁇ W
  • a person can use the same parameters as the uplink communication, but the same parameters, for uplink communication and D2D communication
  • the specific value for interpreting the uplink transmit power parameter as the D2D transmit power parameter may be preset.
  • the first UE determines the D2D transmit power parameter according to the preset correspondence relationship according to the uplink transmit power parameter transmitted by the network device, and According to the determined D2D transmit power The number, the transmission bandwidth of the D2D communication, the modulation format of the D2D communication, and the downlink path loss estimation, calculate the transmission power of the D2D communication according to the uplink transmission power determination mechanism.
  • the rate determining mechanism after calculating the transmit power of the D2D communication, can also quantize the received transmit power of the D2D communication, that is, determine the power level to which the transmit power of the D2D communication belongs, and within a certain level, the D2D communication uses a unified
  • the D2D communication uses a unified
  • different interpretation modes of the uplink transmit power parameters may be used, and it is not necessary to additionally add power control parameters for D2D communication, and no additional power control signaling overhead is added, thereby avoiding notifying multiple sets of parameters (uplink transmit power parameters and The complexity of the D2D transmit power parameter) saves the power control signaling overhead of separately notifying D2D communication.
  • the uplink reflection power may be determined by using any one of the foregoing three manners, and the specific implementation process of the first UE for performing D2D communication may be as shown in FIG. 7B and FIG. 7C.
  • the transmit power of the D2D communication in the embodiment of the present invention is determined according to the uplink transmit power parameter and the downlink path loss estimate, so that the transmit power of the D2D communication of the first UE may be uplink communication between the network device and the first UE.
  • the uplink power determining mechanism determines the transmission bandwidth used for determining the uplink transmit power to be the transmit bandwidth of the D2D communication, and P is the downlink path loss estimate obtained by the first UE by measurement, so the first UE participating in the different D2D communication
  • the transmit power of the D2D communication may be different (determined by the link state of the first UE and the network device, such as the distance between the network device and the first UE of the D2D communication), so the coverage of multiple first UEs performing D2D communication
  • the range is different according to the transmission power of the D2D communication.
  • the coverage of the first UE performing different D2D communication is the same, and the D2D communication can be determined in the first UE of the D2D communication.
  • the number of transmissions or the number of retransmissions is determined, that is, the number of transmissions of D2D data that can increase the low transmission power in the embodiment of the present invention.
  • the first UE receiving a uniform performance ensure the normal communication D2D D2D communication each number of retransmissions, increasing opportunities for D2D data transmission in the time domain, such that the transmit power of different D2D communication.
  • the first UE determines the transmit power of the D2D communication according to the uplink transmit power, and the process of determining the number of retransmissions is as shown in FIG. 7D, and includes:
  • the first UE determines a transmit power of the D2D communication according to the uplink transmit power parameter and the downlink path loss estimate.
  • S202 Determine the number of transmissions or the number of retransmissions according to the transmit power of the D2D communication.
  • the correspondence between the transmit power and the number of retransmissions of the D2D communication may be preset, or the corresponding relationship between the transmit power of the D2D communication and the number of retransmissions is preset, and the transmit power and weight of the D2D communication in the embodiment of the present invention are
  • the correspondence relationship of the number of transmissions, or the correspondence between the transmission power of the D2D communication and the number of retransmissions is referred to as a second correspondence.
  • the first UE determines the number of transmissions or the number of retransmissions according to the transmission power of the D2D communication
  • the number of transmissions or the number of retransmissions may be determined according to the second correspondence.
  • the second correspondence relationship may be preset, and when the transmit power is independent of the modulation format, the second correspondence relationship as shown in Table 7 may be set, and when the transmit power is related to the modulation format, the second correspondence may be set.
  • Table 8 the specific correspondence can be as shown in Table 7 and Table 8:
  • the uplink transmit power, the transmit power and the number of transmissions of the D2D communication shown in Table 9 or Table 10 can be combined with Table 3 and Table 7, Table 4 and Table 8. Correspondence between the uplink transmission power, the transmit power of D2D communication, and the number of retransmissions:
  • the correspondence between the uplink transmit power, the transmit power of the D2D communication, and the number of transmissions as shown in Table 11 may be preset, or preset.
  • the first UE performing D2D communication uses the same transmit power of the D2D communication, and performs D2D data transmission according to the preset second correspondence. If the uplink transmit power is classified, the first UE uses different transmit powers of the D2D communication, and then the transmit power of the D2D communication can be determined according to the correspondence in Table 7 or Table 8.
  • the number of transmissions or the number of retransmissions may be determined according to the correspondence in Table 7
  • the process of determining the transmit power of the D2D communication is based on
  • the number of transmissions or the number of retransmissions may be determined according to the correspondence in Table 8.
  • S203 The D2D data is transmitted according to the number of transmissions or the number of retransmissions determined by S202, and the transmission power of the D2D communication.
  • the number of transmissions or the number of retransmissions of D2D data with low transmission power can be increased, and the transmission opportunity of D2D data is increased in the time domain, so that the first UE has a uniform reception performance index.
  • the second UE when the first UE transmits D2D data according to the determined number of transmissions and the transmit power of the D2D communication, or when the D2D data is transmitted according to the determined number of retransmissions and the transmit power of the D2D communication, the second UE is used to enable the second UE.
  • the first UE can transmit the transmission times information or the retransmission times information in the embodiment of the present invention.
  • the specific implementation process is shown in FIG. 7E, and FIG. 7E is based on FIG. 7D. Also includes:
  • the scheduling assignment indicates, by the first UE of the D2D communication, the information of the second UE of the D2D communication for the information of the subsequent D2D data, etc.
  • the first UE may carry the transmission times information or the retransmission times information in the SA, and implement the transmission of the transmission times information or the retransmission times information.
  • S204 may be performed after S203, or may be performed before S203, which is not limited by the embodiment of the present invention.
  • the transmit power of the D2D communication used by the first UE that performs the D2D communication may be different, which may cause different coverage of the first UE, and thus the receiving performance of the data transmitted by the first UE may be different, such as D2D communication.
  • the first UE with high transmit power may cover a larger range, that is, may be correctly received by the second UE with more potential D2D communication, while the first UE with low transmit power of D2D communication covers a relatively small range, that is, The second UE that is caused by relatively little potential D2D communication is correctly received, and the target of the D2D communication is usually that the first UE of the D2D communication has the same coverage.
  • the number of transmissions or retransmissions of data transmission by the first UE with low transmission power may be increased, and transmission opportunities may be increased in the time domain, so that sufficient energy is accumulated after multiple transmissions.
  • the transmission power is different, the same reception performance can be achieved.
  • FIG. 8 is a flowchart of a communication method according to an embodiment of the present invention.
  • the execution body of the communication method shown in FIG. 8 is an example of the first UE. As shown in FIG. 8, the method includes:
  • the first UE performing D2D communication determines the transmission times information or the retransmission times information of the D2D communication.
  • the first UE performing the D2D communication transmits the D2D data according to the transmission times information or the retransmission times information determined by S301, and transmits the transmission times information or the retransmission times information determined by S301.
  • the first UE of the D2D communication determines the transmission times information or the retransmission times information of the D2D communication, and transmits the D2D data according to the determined transmission times information or the retransmission times information, so that the D2D communication can be normally performed.
  • the first UE performing D2D communication in the embodiment of the present invention may be sent according to D2D communication.
  • the shot power determines the number of transmission times or the number of retransmissions information, and then transmits the D2D data according to the determined number of transmissions or the number of retransmissions, and the transmission power of the D2D communication.
  • the first UE performing D2D communication needs to determine the transmit power of the D2D communication before performing S301.
  • the present invention The first UE performing D2D communication in the embodiment may determine the transmit power of the D2D communication according to the uplink transmit power parameter.
  • the first UE performing D2D communication in the embodiment of the present invention may determine the transmit power of the D2D communication according to the uplink transmit power parameter, and may determine the transmit power of the D2D communication by using the first UE of the D2D communication in the sixth embodiment, for example, :
  • the first UE determines the uplink transmit power according to the uplink transmit power parameter, the transmit bandwidth of the D2D communication, and the downlink path loss estimate, and determines the transmit power of the D2D communication according to the uplink transmit power; or the first UE according to the uplink transmit power parameter, D2D
  • the transmission bandwidth of the communication, the modulation format of the D2D communication, and the downlink path loss estimation determine the uplink transmission power, and determine the transmission power of the D2D communication according to the uplink transmission power.
  • the row transmit power is quantized to determine the power level to which the uplink transmit power belongs, and the transmit power of the D2D communication is determined according to the correspondence between the preset power level and the transmit power of the D2D communication.
  • the first UE determines the transmit power of the D2D communication according to the uplink transmit power parameter transmitted by the network device, the transmit bandwidth of the D2D communication, the downlink path loss estimate, and the power offset amount transmitted by the network device; or the first UE transmits according to the network device.
  • the uplink transmit power parameter, the transmit bandwidth of the D2D communication, the modulation format of the D2D communication, the downlink path loss estimate, and the power offset amount transmitted by the network device determine the transmit power of the D2D communication.
  • the first UE determines the D2D transmit power parameter according to the preset corresponding relationship according to the uplink transmit power parameter transmitted by the network device, and determines according to the determined D2D transmit power parameter, the transmit bandwidth of the D2D communication, and the downlink path loss, according to the uplink transmit power.
  • the mechanism calculates the transmit power of the D2D communication; or the first UE determines the D2D transmit power parameter according to the preset correspondence according to the uplink transmit power parameter transmitted by the network device, and according to the determined D2D transmit power parameter, D2D
  • the transmission bandwidth of the communication, the modulation format of the D2D communication, and the downlink path loss estimation, the transmission power of the D2D communication is calculated according to the uplink transmission power determination mechanism.
  • the correspondence between the transmit power, the number of transmissions, and the number of retransmissions of the D2D communication may be preset. After determining the transmit power of the D2D communication, the transmit power and transmission according to the preset D2D communication may be transmitted. For the correspondence between the number of times and the number of retransmissions, the number of transmissions or the number of retransmissions is determined. For the correspondence between the transmission power, the number of transmissions, and the number of retransmissions of the D2D communication, refer to the related description in Embodiment 6, and details are not described herein again.
  • the size of the transmit power may also be related to the modulation format.
  • the transmit power may also be different, so when the modulation format of the first UE of the D2D communication is variable, Then, the first UE may perform the determination of the transmit power of the D2D communication according to the modulation format used by the D2D communication.
  • the first UE may determine the uplink transmit power according to the high-level configuration parameter deltaMCS-Enabled, the uplink transmit power parameter, and the modulation format of the D2D communication, and determine each modulation to which the uplink transmit power belongs according to the uplink transmit power.
  • the power level in the format so that the first UE of the D2D communication can determine the D2D according to the correspondence between the uplink transmit power, the modulation format of the D2D communication, and the preset power level of each modulation format and the transmit power of the D2D communication.
  • the transmission power of the communication, the power level in each modulation format defined in the embodiment of the present invention, and the correspondence between the power level in each modulation format and the transmission power of the D2D communication may be further referred to in the sixth embodiment. Description, no longer repeat here.
  • the first UE may carry the transmission times information or the retransmission times information in the scheduling assignment (SA), and implement the transmission of the transmission times information or the retransmission times information.
  • SA scheduling assignment
  • the method for performing the D2D communication of the first UE involved in the seventh embodiment of the present invention is similar to the method for performing the communication in the sixth embodiment.
  • the details are not described in detail in the sixth embodiment. Related descriptions are not described here.
  • the first UE determines the transmission times information of the D2D communication or The retransmission number information transmits D2D data according to the determined transmission number information or the retransmission number information, thereby ensuring normal D2D communication.
  • the first UE determines, according to the downlink path loss estimation and the received uplink transmit power parameter, the transmit power for performing D2D communication, that is, the D2D data is transmitted by the first UE of the D2D communication in the prior art at the maximum transmit power, and the present invention
  • the transmit power of the D2D communication is determined by using the downlink path loss estimation, so that the D2D communication signal of the first UE of the D2D communication undergoes the fading of the channel and the received power of the network device is not higher than the first UE.
  • the received uplink power of the communication arrives at the received power of the network device, which can ensure that the received power of the D2D communication signal of the first UE of the D2D communication arrives at the network device is equivalent to the received power of the uplink signal of the other UE to the network device, which can reduce or avoid the in-band leakage. Interference does not affect the reception of uplink signals of other UEs, which in turn can reduce the impact of D2D communication on uplink communication.
  • FIG. 9 is a flowchart of a communication method according to an embodiment of the present invention.
  • the execution entity of the communication method shown in FIG. 9 is a second UE.
  • the method includes:
  • the second UE performing D2D communication acquires the transmission times information or the retransmission times information of the D2D communication.
  • the second UE performing D2D communication receives data according to the obtained transmission frequency information or retransmission times information.
  • the second UE performing the D2D communication in the embodiment of the present invention may be based on the acquired transmission.
  • the number of times information or the number of retransmissions information is received to ensure accurate reception of data.
  • the second UE may obtain a scheduling signaling (SA) notification, and obtain the number of transmissions from the SA notification.
  • SA scheduling signaling
  • the second UE may receive data according to the obtained transmission times information or retransmission times information, so as to ensure accurate reception of data, and can ensure D2D communication. Work properly.
  • FIG. 10 is a flowchart of the implementation of the communication method according to the embodiment of the present invention.
  • the execution body of the communication method shown in FIG. 10 is an example of a network device. As shown in FIG. 10, the method includes:
  • the network device determines an uplink transmit power parameter.
  • the network device sends the determined uplink transmit power parameter, so that the first UE determines the transmit power of the D2D communication according to the uplink transmit power parameter.
  • the network device may send different uplink transmit power parameters according to the manner in which the first UE determines the transmit power of the D2D communication, for example, the network device may send the relevant uplink transmit power parameter, so that the first UE may According to the uplink transmit power parameter, the transmit bandwidth and the downlink path loss estimation of the D2D communication, or the uplink transmit power according to the uplink transmit power parameter, the transmit bandwidth of the D2D communication, the modulation format of the D2D communication, and the downlink path loss estimate, and according to the determined uplink
  • the transmit power determines the transmit power of the D2D communication; the first UE may also determine the D2D transmit power parameter according to the preset corresponding relationship according to the uplink transmit power parameter transmitted by the network device, and interpret the same uplink transmit power parameter used by the uplink communication.
  • the network device may also send an uplink transmit power parameter and a power offset, so that the first UE determines the uplink transmit power according to the uplink transmit power parameter, and then determines the transmit power of the D2D communication according to the power offset.
  • the transmission bandwidth of the D2D communication is the transmission bandwidth of the D2D communication used by the first UE for determining the uplink transmission power.
  • the modulation format of the D2D communication is a modulation format of the D2D communication used by the first UE for determining the uplink transmission power.
  • the network device may send the uplink transmit power parameter, the power offset, and the D2D communication by using a broadcast mode, a radio resource control protocol RRC mode, or a physical layer signaling control mode or a combination of the foregoing manners. Bandwidth and modulation format of D2D communication, etc.
  • the high-level configuration parameter in the uplink power parameter is sent by the broadcast mode or the radio resource control protocol RRC, and the power control domain TPC is sent by the physical layer signaling.
  • the power offset transmitted by the network device is a power offset of the transmit power of the D2D communication relative to the uplink transmit power, and may use a high-level configuration parameter, or a physical layer configuration parameter, or a combination of a high-level configuration parameter and a physical layer configuration parameter.
  • the high-level configuration parameter notifies a first offset
  • the physical layer configuration parameter notifies a second offset
  • the first UE can obtain the power offset by combining the first offset and the second offset; Only the first offset or the second offset may be notified.
  • the network device may be an evolved base station (eNB) in the LTE system, or a base station (NB) in the Universal Mobile Telecommunications System (UMTS). It is another network device that communicates with the UE and performs resource scheduling for the UE.
  • eNB evolved base station
  • NB base station
  • UMTS Universal Mobile Telecommunications System
  • the network device sends the determined uplink transmit power parameter to the first UE of the D2D communication, and the first UE of the D2D communication determines, according to the downlink path loss estimation and the received uplink transmit power parameter,
  • the transmit power of the D2D communication that is, the D2D data is transmitted at the maximum transmit power of the first UE in the D2D communication in the prior art.
  • the transmit power of the D2D communication in the embodiment of the present invention is determined by using the downlink path loss estimation, so that the D2D communication is determined.
  • the D2D signal of the first UE undergoes the fading of the channel and the received power of the network device is not higher than the received power of the uplink signal of the first UE for uplink communication, and the D2D signal of the first UE of the D2D communication can be guaranteed.
  • the received power of the network device is equivalent to the received power of the uplink signals of other UEs to the network device, which can reduce or avoid in-band leakage interference, and does not affect the reception of uplink signals of other UEs, thereby reducing the impact of D2D communication on uplink communication.
  • embodiments of the invention may be provided as a method, system, or Computer program product. Accordingly, the present invention may take the form of an entirely hardware embodiment, an entirely software embodiment, or a combination of software and hardware. Moreover, the invention can be embodied in the form of one or more computer program products embodied on a computer-usable storage medium (including but not limited to disk storage, CD-ROM, optical storage, etc.) in which computer usable program code is embodied.
  • a computer-usable storage medium including but not limited to disk storage, CD-ROM, optical storage, etc.
  • the computer program instructions can also be stored in a computer readable memory that can direct a computer or other programmable data processing device to operate in a particular manner, such that the instructions stored in the computer readable memory produce an article of manufacture comprising the instruction device.
  • the apparatus implements the functions specified in one or more blocks of a flow or a flow and/or block diagram of the flowchart.
  • These computer program instructions can also be loaded onto a computer or other programmable data processing device such that a series of operational steps are performed on a computer or other programmable device to produce computer-implemented processing for execution on a computer or other programmable device.
  • the instructions provide steps for implementing the functions specified in one or more of the flow or in a block or blocks of a flow diagram.

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Abstract

L'invention concerne un procédé et un dispositif de communication. Dans les modes de réalisation de la présente invention, un premier terminal utilisateur de communication dispositif à dispositif (D2D) acquiert un paramètre de puissance de transmission en liaison montante; le premier terminal utilisateur détermine une puissance de transmission pour la communication D2D selon le paramètre de puissance de transmission sur la liaison montante et un affaiblissement de propagation en liaison descendante; et le premier terminal utilisateur transmet des données D2D en fonction de la puissance de transmission pour la communication D2D. Les effets négatifs provoqués par une fuite dans la bande dans la communication en liaison montante peuvent être réduits au moyen des modes de réalisation de la présente invention.
PCT/CN2014/077078 2014-05-08 2014-05-08 Procédé et dispositif de communication Ceased WO2015168917A1 (fr)

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