WO2019028748A1 - 设备对设备通信的方法和终端设备 - Google Patents

设备对设备通信的方法和终端设备 Download PDF

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Publication number
WO2019028748A1
WO2019028748A1 PCT/CN2017/096858 CN2017096858W WO2019028748A1 WO 2019028748 A1 WO2019028748 A1 WO 2019028748A1 CN 2017096858 W CN2017096858 W CN 2017096858W WO 2019028748 A1 WO2019028748 A1 WO 2019028748A1
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WIPO (PCT)
Prior art keywords
terminal device
tti
length
release
specific bit
Prior art date
Application number
PCT/CN2017/096858
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English (en)
French (fr)
Inventor
林亚男
Original Assignee
Oppo广东移动通信有限公司
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Oppo广东移动通信有限公司 filed Critical Oppo广东移动通信有限公司
Priority to PCT/CN2017/096858 priority Critical patent/WO2019028748A1/zh
Priority to CN201780090904.XA priority patent/CN110663278B/zh
Priority to EP17921315.2A priority patent/EP3614762B1/en
Publication of WO2019028748A1 publication Critical patent/WO2019028748A1/zh
Priority to IL270707A priority patent/IL270707A/en
Priority to PH12019502624A priority patent/PH12019502624A1/en
Priority to US16/706,275 priority patent/US11122548B2/en

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W76/00—Connection management
    • H04W76/10—Connection setup
    • H04W76/14—Direct-mode setup
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/20—Control channels or signalling for resource management
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W4/00—Services specially adapted for wireless communication networks; Facilities therefor
    • H04W4/30—Services specially adapted for particular environments, situations or purposes
    • H04W4/40—Services specially adapted for particular environments, situations or purposes for vehicles, e.g. vehicle-to-pedestrians [V2P]
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/04—Wireless resource allocation
    • H04W72/044—Wireless resource allocation based on the type of the allocated resource
    • H04W72/0446—Resources in time domain, e.g. slots or frames

Definitions

  • the embodiments of the present application relate to the field of wireless communications, and in particular, to a device to device (D2D) communication method and a terminal device.
  • D2D device to device
  • Vehicle networking or vehicle-to-device (V2X) communication system is a sidelink (SL) transmission technology based on D2D communication, which is adopted in the traditional Long Term Evolution (LTE) system.
  • LTE Long Term Evolution
  • the way in which the base station receives or transmits data is different.
  • the vehicle networking system adopts a terminal-to-terminal direct communication method, and thus has higher spectrum efficiency and lower transmission delay.
  • a terminal In an Internet of Vehicles system, a terminal indicates a data channel resource for transmitting a data channel through a control channel, and performs data transmission on a corresponding data channel resource, and transmits a corresponding data channel on a control channel resource corresponding to the data channel resource.
  • Control channel In Release 3 of the 3rd Generation Partnership Project (3GPP) protocol, the terminal performs control channel and data channel transmission based on Transmission Time Interval (TTI), and the data channel and its The corresponding control channel is transmitted in the same TTI.
  • TTI Transmission Time Interval
  • the control channel and data channel can be transmitted in a short TTI (sort TTI, sTTI).
  • the terminal of Release-15 can simultaneously send two control channels, and the other is a control channel based on TTI transmission (which can be called normal control). Channel), the other is a control channel based on sTTI transmission (which can be called a short control channel).
  • TTI transmission which can be called normal control
  • sTTI transmission which can be called a short control channel
  • the terminal of Release-15 detects the normal control channel, it cannot be determined whether the normal control channel is the control channel sent by the terminal of Release-15 or the control channel sent by the terminal of another Release-14. Determine whether to perform resource sensing based on TTI or resource sensing based on sTTI.
  • the embodiment of the present application provides a method and a terminal device for D2D communication, and the terminal device can perform resource sensing effectively according to the detected control channel.
  • a first aspect provides a method for D2D communication, including: receiving, by a first terminal device, a control channel sent by a second terminal device on a first transmission time interval TTI, where the control channel includes a specific bit, the specific bit Bits are used to indicate a time domain length used by the second terminal device to transmit a data channel; if the value on the specific bit bit indicates that the time domain length is equal to the length of the first TTI, the first terminal device Listening, by the first TTI, a data channel sent by the second terminal device; if the value on the specific bit indicates that the time domain length is equal to the length of the second TTI, the first terminal device And listening, according to the second TTI, the data channel sent by the second terminal device, where a length of the second TTI is smaller than a length of the first TTI.
  • the first terminal device determines the resource occupancy of the data channel corresponding to the control channel by using the information represented by the specific bit in the detected control channel, so that the first terminal device can be valid according to the detected control channel. Resource listening.
  • the first TTI includes multiple second TTIs, and if the value on the specific bit indicates that the time domain length is equal to the length of the second TTI, the multiple bits The value on the bit also indicates the relative position of the second TTI of the second terminal device for transmitting the data channel in the plurality of second TTIs.
  • the lengths of the plurality of second TTIs are the same or different.
  • the length of the second TTI is equal to one time slot.
  • control channel carries side downlink control information SCI, and the specific bit is a reserved bit included in the SCI.
  • the first terminal device supports a communication protocol of Release Release-15
  • the second terminal device supports a communication protocol of Release Release-14 and does not support a communication protocol of Release Release-15.
  • the value on the specific bit indicates that the time domain length is the length of the first TTI; or the first terminal device supports the communication protocol of the version Release-15, and the second terminal device supports the version Release-15 A communication protocol, the value on the specific bit indicating that the time domain length is the length of the first TTI or the length of the second TTI.
  • a second aspect provides a method for D2D communication, including: a second terminal device sends a control channel to a first terminal device according to a first TTI, where the control channel includes a specific bit, where the specific bit is used to indicate The length of the second terminal device used for transmitting the data channel is the length of the second TTI, the length of the second TTI is less than the length of the first TTI; and the second terminal device is based on the second TTI Transmitting, by the first terminal device, the data channel, so that the first terminal device determines, according to the value on the specific bit, that the second terminal device is used to send The time domain length of the data channel is the length of the second TTI, and the data channel sent by the second terminal device is intercepted based on the second TTI.
  • the second terminal device indicates the resource occupancy of the data channel corresponding to the control channel by setting a specific bit of the control channel to be transmitted, so that the first terminal device that detects the control channel can be valid according to the specific bit. Resource listening.
  • the second terminal device determines that a time domain length for transmitting the data channel is a length of the second TTI, and the second terminal device is configured according to a length of the second TTI. And setting a value on the specific bit to a value corresponding to a length of the second TTI.
  • the first TTI includes multiple second TTIs, and if the value on the specific bit indicates that the time domain length is equal to the length of the second TTI, the multiple bits The value on the bit also indicates the relative position of the second TTI of the second terminal device for transmitting the data channel in the plurality of second TTIs.
  • the lengths of the plurality of second TTIs are the same or different.
  • the length of the second TTI is equal to one time slot.
  • control channel carries side downlink control information SCI, and the specific bit is a reserved bit included in the SCI.
  • the first terminal device supports a communication protocol of Release Release-15
  • the second terminal device supports a communication protocol of Release Release-14 and does not support a communication protocol of Release Release-15.
  • the value on the specific bit indicates that the time domain length is the length of the first TTI; or the first terminal device supports the communication protocol of the version Release-15, and the second terminal device supports the version Release-15 A communication protocol, the value on the specific bit indicating that the time domain length is the length of the first TTI or the length of the second TTI.
  • a terminal device in a third aspect, can perform the operations of the first terminal device in the foregoing first aspect or any optional implementation manner of the first aspect.
  • the terminal device may comprise a modular unit for performing the operations of the first terminal device in any of the first aspect or any of the possible implementations of the first aspect described above.
  • a terminal device which can perform the operations of the second terminal device in any of the foregoing optional implementations of the second aspect or the second aspect.
  • the terminal device may comprise a modular unit for performing the operation of the second terminal device in any of the possible implementations of the second aspect or the second aspect described above.
  • a terminal device comprising: a processor, a transceiver, and Memory.
  • the processor, the transceiver, and the memory communicate with each other through an internal connection path.
  • the memory is for storing instructions for executing instructions stored by the memory.
  • the processor executes the instruction stored by the memory, the executing causes the terminal device to perform the method in the first aspect or any possible implementation manner of the first aspect, or the execution causes the terminal device to implement the terminal provided by the third aspect device.
  • a terminal device comprising: a processor, a transceiver, and a memory.
  • the processor, the transceiver, and the memory communicate with each other through an internal connection path.
  • the memory is for storing instructions for executing instructions stored by the memory.
  • the processor executes the instruction stored by the memory, the executing causes the terminal device to perform the method in any of the possible implementations of the second aspect or the second aspect, or the execution causes the terminal device to implement the terminal provided by the fourth aspect device.
  • a computer readable storage medium storing a program causing a terminal device to perform the first aspect described above, and any one of the various implementations of the D2D communication Methods.
  • a computer readable storage medium storing a program causing the terminal device to perform the second aspect described above, and any one of the various implementations of the D2D communication Methods.
  • a system chip comprising an input interface, an output interface, a processor, and a memory
  • the processor is configured to execute an instruction stored by the memory, and when the instruction is executed, the processor can implement the foregoing The method of any of the first aspect or any of the possible implementations of the first aspect.
  • a system chip includes an input interface, an output interface, a processor, and a memory
  • the processor is configured to execute an instruction stored by the memory, and when the instruction is executed, the processor can implement the foregoing The method of any of the second aspect or any possible implementation of the second aspect.
  • a computer program product comprising instructions for causing a computer to execute the method of any of the first aspect or the first aspect of the first aspect, when the computer program product is run on a computer.
  • a computer program product comprising instructions which, when executed on a computer, cause the computer to perform the method of any of the second aspect or the second aspect of the second aspect.
  • FIG. 1 is a schematic structural diagram of an application scenario of an embodiment of the present application.
  • FIG. 2 is a schematic diagram of resources used by a terminal device to transmit a control channel and a data channel.
  • FIG. 3 is a schematic diagram of resources used by a terminal device to transmit a control channel and a data channel.
  • FIG. 4 is a schematic flowchart of a method for D2D communication according to an embodiment of the present application.
  • FIG. 5 is a schematic diagram of a first TTI and a second TTI according to an embodiment of the present application.
  • FIG. 6 is a schematic flowchart of a method for D2D communication according to an embodiment of the present application.
  • FIG. 7 is a schematic block diagram of a first terminal device according to an embodiment of the present application.
  • FIG. 8 is a schematic block diagram of a second terminal device according to an embodiment of the present application.
  • FIG. 9 is a schematic structural diagram of a first terminal device according to an embodiment of the present application.
  • FIG. 10 is a schematic structural diagram of a second terminal device according to an embodiment of the present application.
  • FIG. 11 is a schematic structural diagram of a system chip according to an embodiment of the present application.
  • GSM Global System of Mobile Communication
  • CDMA Code Division Multiple Access
  • WCDMA Wideband Code Division Multiple Access
  • LTE Long Term Evolution
  • FDD Frequency Division Duplex
  • TDD Time Division Duplex
  • UMTS Universal Mobile Telecommunication System
  • the present application describes various embodiments in connection with a terminal device.
  • the terminal device may also refer to a user equipment (User Equipment, UE), an access terminal, a subscriber unit, a subscriber station, a mobile station, a mobile station, a remote station, a remote terminal, a mobile device, a user terminal, a terminal, a wireless communication device, and a user agent.
  • the access terminal may be a cellular phone, a cordless phone, a Session Initiation Protocol (SIP) phone, a Wireless Local Loop (WLL) station, a Personal Digital Assistant (PDA), with wireless communication.
  • PLMN public land mobile network
  • the present application describes various embodiments in connection with a network device.
  • the network device may be a device for communicating with the terminal device, for example, may be a base station (Base Transceiver Station, BTS) in the GSM system or CDMA, or may be a base station (NodeB, NB) in the WCDMA system, or may be An evolved base station (Evolutional Node B, eNB or eNodeB) in an LTE system, or the network device may be a relay station, an access point, an in-vehicle device, a wearable device, and a network side device in a future 5G network or a future evolved PLMN network. Network side devices, etc.
  • FIG. 1 is a schematic diagram of an application scenario of an embodiment of the present application.
  • FIG. 1 exemplarily shows a network device, that is, a network device 10, and three terminal devices, that is, a terminal device 20, a terminal device 30, and a terminal device 40.
  • the wireless communication system may include a plurality of network devices and each The other types of terminal devices may be included in the coverage of the network device, which is not limited in this embodiment of the present invention.
  • the wireless communication system may further include other network entities such as a Mobile Management Entity (MME), a Serving Gateway (S-GW), and a Packet Data Network Gateway (P-GW).
  • MME Mobile Management Entity
  • S-GW Serving Gateway
  • P-GW Packet Data Network Gateway
  • the terminal device 20, the terminal device 30, and the terminal device 40 can communicate in a cellular communication mode or a D2D communication mode, wherein in the cellular communication mode, the terminal device communicates with other terminal devices through a cellular link with the network device.
  • the terminal device In the D2D communication mode, two terminal devices communicate directly through a D2D link, ie, a side link (Sidelink, SL).
  • the D2D communication may refer to a vehicle to vehicle (V2V) communication or a vehicle to Everything (V2X) communication.
  • V2X communication X can refer to any device with wireless receiving and transmitting capabilities, such as but not limited to slow moving wireless devices, fast moving in-vehicle devices, or network control nodes with wireless transmit and receive capabilities. It should be understood that the embodiment of the present invention is mainly applied to the scenario of V2X communication, but can also be applied to any other D2D communication scenario, which is not limited in this embodiment of the present invention.
  • the terminal device 20 can transmit Sidelink Control Information (SCI).
  • SCI carries information related to data transmission of the terminal device 20, such as Modulation and Coding Scheme (MCS), time-frequency resource allocation information, resource reservation information, and the like.
  • MCS Modulation and Coding Scheme
  • the terminal device 30 or the terminal device 40 that detects the SCI can obtain the location of the time-frequency resource used by the terminal device 20 for data transmission through the SCI, and The resource reservation information and the like are used to judge the resource usage of the terminal device 20. If the terminal device 30 or the terminal device 40 cannot successfully detect the resource scheduling information, the energy on all the transmission resources may be measured, and all the transmission resources are sorted according to the energy level, and the low-energy transmission resource is preferentially selected for its own data transmission. .
  • the SCI is carried on a Physical Sideline Control CHannel (PSCCH), and the SCI may use, for example, a format such as format 1, where SCI
  • the format 1 includes the control information corresponding to the PSSCH, such as the MCS, the time-frequency resource indication information, the priority information, the resource reservation information, and the retransmission indication information, and the SCI format 1 further includes a reserved bit, in the version Release-14. The value of all reserved bits of the SCI is set to zero.
  • the Resource Reservation information in the SCI is different from the Reserved Information Bits of the SCI.
  • the resource reservation information in the SCI generally includes 4 bits, which is used to indicate whether the terminal device reserves a corresponding transmission resource for subsequent data transmission.
  • the reserved bits of the SCI are temporarily unused bits and are generally set to zero.
  • a short TTI (sort TTI) is introduced, and a terminal device supporting Release-15 is required to use sTTI to transmit a data channel, and a terminal device supporting Release-15 and A terminal device supporting Release-14 (Rel-14) can perform data transmission in a common resource pool, which has a great influence on the resource sensing and selection process of the terminal device supporting Release-14. Therefore, the terminal device that needs Release-14 can detect that the terminal device of Release-15 sends the SCI, such as resource scheduling information or scheduling allocation (SA) information, to learn the resource occupancy of the terminal device of Release-15, thereby performing resources. Listening and selection. This requires the Release-15 terminal device to be able to send a normal control channel compatible with the Release-14 version.
  • SCI resource scheduling information or scheduling allocation (SA) information
  • the control channel and the data channel can be transmitted in the same sTTI, that is, the terminal device of Release-15 can send a short control channel on the sTTI, for example, Short scheduling (short SA, sSA) information is sent on the sTTI.
  • the terminal device of Release-15 can obtain the content of the control channel by detecting the sSA, and determine the location of the data channel resource according to the sSA and perform the detection of the data channel, without waiting for a TTI of 1 ms (ie, normal TTI). The detection of the control channel is completed after the end, thereby reducing the delay.
  • the terminal device of Release-14 needs to detect the control channel sent by the terminal device of Release-15, so as to obtain the resource occupation of the terminal device of Release-15. Thereby resource listening and selection.
  • the terminal device of Release-15 also needs to detect the control channel sent by the terminal device of Release-15, so as to acquire the resource occupancy of the terminal device of Release-15, thereby performing resource sensing and selection. Therefore, for example, the resources used by the control channel and the data channel shown in FIG. 2, the terminal device of Release-15 needs the short SA and the data channel transmitted on the sTTI, and the normal SA needs to be transmitted on the TTI.
  • the terminal device of Release-14 and the terminal device of Release-15 may exist at the same time, if a terminal device of Release-15 detects a normal SA, it cannot recognize that the SA is a terminal of Release-14.
  • the device sends out, or is issued by the terminal device of Release-15. If the SA is a terminal device of Release-14, the frequency domain resource indicated by the SA for transmitting the data channel is occupied in one subframe; if the SA is sent by the terminal device of Release-15, Then, the terminal device that sends the SA also sends the short SA and sends the data channel based on the sTTI.
  • the short SA and the data channel sent based on the sTTI only occupy part of the resources in one subframe, so the terminal device that receives the SA needs to be based on The content of the short SA is used to determine the resource usage of the specific data channel.
  • the terminal device 20 and the terminal device 30 are terminal devices of Release-15, and the terminal device 40 is a terminal device of Release-14.
  • the terminal device 20 determines the resource occupancy of the data channel of the terminal device 30 according to the content of the short SA, instead of determining the resource occupation of the data channel of the terminal device 30 according to the content of the received SA.
  • the terminal device 20 receives the SA sent by the terminal device 40
  • the resource occupancy of the data channel of the terminal device 40 can be directly determined according to the content of the SA.
  • the terminal device 20 receives a certain SA, it cannot distinguish whether the SA is sent by the terminal device 30 or the terminal device 40, and it is impossible to determine whether the data channel resource should be determined according to the received SA.
  • the terminal device determines the resource occupancy of the data channel corresponding to the control channel by using the information represented by the specific bit in the control channel, so that the terminal device can effectively use the detected control channel. Perform resource listening.
  • a terminal device that supports a communication protocol of Release-14 and does not support Release-15 will support a communication protocol of Release-15.
  • the terminal device is simply referred to as the terminal device of Release-15.
  • the terminal device of Release-15 may include a terminal device supporting Release-15 or a terminal device supporting other versions of Release-15, for example, a terminal device supporting Release-16 of Release-15.
  • FIG. 4 is a schematic flowchart of a method for D2D communication according to an embodiment of the present application.
  • the method shown in FIG. 4 can be performed by a first terminal device, which can be, for example, the terminal device 20 shown in FIG. 1, and the second terminal device can be, for example, the terminal device 30 or the terminal device shown in FIG. 40.
  • the method for D2D communication includes:
  • the first terminal device receives the control channel sent by the second terminal device on the first TTI.
  • the control channel includes a specific bit, which is used to indicate a time domain length used by the second terminal device to transmit the data channel.
  • the first terminal device receives, according to the first TTI, a control channel sent by the second terminal device, where the control channel can carry, for example, an SCI, the SCI can include the specific bit, and the specific bit can be used to indicate The time domain length used by the second terminal device to transmit the data channel.
  • the first terminal device may determine, according to the value on the specific bit, whether the time domain length used by the second terminal device to send the data channel is the length of the first TTI or the length of the second TTI, so as to detect the length based on the corresponding TTI length.
  • the data channel sent by the two terminal devices may determine, according to the value on the specific bit, whether the time domain length used by the second terminal device to send the data channel is the length of the first TTI or the length of the second TTI, so as to detect the length based on the corresponding TTI length.
  • the data channel sent by the two terminal devices may determine, according to the value on the specific bit, whether the time domain length used by the second terminal device to send the data channel is the length
  • the mapping between the specific bit length shown in Table 1 and the time domain length of the data channel if the value on the specific bit is 0, indicating that the time domain length used by the second terminal device to transmit the data channel is equal to the first
  • the length of the TTI that is, the length of the time domain of the data channel corresponding to the control channel is the length of the first TTI.
  • the second terminal device may be, for example, the terminal of the 3GPP protocol supporting the Release-14 shown in FIG.
  • the device 40 if the value of the specific bit is 1, it indicates that the time domain length used by the second terminal device to transmit the data channel is equal to the length of the second TTI, that is, the time domain length of the data channel corresponding to the control channel is
  • the length of the two TTIs at this time, the second terminal device may be, for example, the terminal device 30 of the 3GPP protocol supporting the version Relesae-15 shown in FIG.
  • the length of the second TTI is smaller than the length of the first TTI.
  • the first TTI is equal to one subframe, that is, 1 ms
  • the second TTI is equal to one slot, that is, 0.5 ms.
  • the first terminal device performs 420; if the specific bit is on The value indicates that the time domain length used by the second terminal device to transmit the data channel is equal to the length of the second TTI, and then the first terminal device performs 430.
  • the first terminal device listens to the data channel sent by the second terminal device based on the first TTI.
  • the first terminal device listens to the data channel sent by the second terminal device based on the second TTI.
  • the first terminal device determines the resource occupancy of the data channel corresponding to the control channel by using the information represented by the specific bit in the detected control channel, so that the first terminal device can be valid according to the detected control channel. Resource listening.
  • control channel sent by the second terminal device carries side-line control information SCI, where the specific bit is a reserved bit included in the SCI.
  • the first TTI includes multiple second TTIs. If the value on the specific bit indicates that the time domain length is equal to the length of the second TTI, the value on the multiple bits may also represent the second terminal.
  • the device is configured to send a relative position of the second TTI of the data channel in the plurality of second TTIs.
  • the specific bit in the control channel can not only indicate whether the time domain length used by the second terminal device to transmit the data channel is the length of the first TTI or the length of the second TTI, but also the relative position of the second TTI. For example, as shown in FIG. 5, if the length of the first TTI is 1 ms, that is, 1 ms, and the length of the second TTI is 0.5 ms, the first TTI corresponds to two second TTs. . As shown in FIG. 5, the second terminal device sends its data channel based on the second TTI, and the second TTI occupied by the data channel is the previous TTI in the first TTI corresponding to the second TTI (ie, the first Two TTI).
  • the second terminal device can set the value on the specific bit of the control channel that it sends to 01 according to the mapping relationship between the specific bit and the time domain length shown in Table 2.
  • the first terminal device detects the After controlling the channel, determining, by the value on the specific bit, that the second terminal device transmits data on a previous second TTI of each first TTI, and listening data of the second terminal device based on the second TTI channel.
  • the first TTI shown in FIG. 5 includes two second TTIs, and the two second TTIs are equal in length (all equal to one slot length).
  • the lengths of the plurality of second TTIs corresponding to the first TTI may be the same or different.
  • the first TTI corresponds to 4 second TTIs, and the lengths of the 4 second TTIs are equal to the lengths of 4 time domain symbols, 3 time domain symbols, 3 time domain symbols, and 4 time domain symbols, respectively.
  • the data channel to be transmitted may be a data channel transmitted based on the second TTI as shown in FIG. 5, of course, the terminal device 30 may also be based on the first TTI.
  • the data channel is sent, which is not limited in this embodiment of the present application. If the terminal device 30 can transmit data based on the first TTI or the second TTI, the value on the specific bit of the control channel sent by the terminal device 30 can be set to a value indicating the length of the first TTI. It can also be set to a value indicating the length of the second TTI.
  • the data channel is transmitted based on the first TTI, and the value on the specific bit of the control channel transmitted by the terminal device 40 is a value indicating the length of the first TTI.
  • the value on the specific bit indicates the The length of the time domain is the length of the first TTI; or, if the first terminal device supports the communication protocol of the Release Release-15, the second terminal device supports the communication protocol of the Release Release-15, and the value on the specific bit indicates the time
  • the length of the field is the length of the first TTI or the length of the second TTI.
  • FIG. 6 is a schematic flowchart of a method for D2D communication according to an embodiment of the present application.
  • the method shown in FIG. 6 can be performed by a second terminal device, which can be, for example, the terminal device 30 or the terminal device 40 shown in FIG. 1.
  • the method for D2D communication includes:
  • the second terminal device sends a control channel to the first terminal device based on the first TTI, where the control channel includes a specific bit, where the specific bit is used to indicate that the second terminal device is configured to send a data channel.
  • the length of the time domain is the length of the second TTI, and the length of the second TTI is less than the length of the first TTI.
  • the second terminal device sends the data channel to the first terminal device based on the second TTI, so that the first terminal device determines the value according to the value on the specific bit position.
  • the time domain length used by the second terminal device to send the data channel is the length of the second TTI, and the data channel sent by the second terminal device is intercepted based on the second TTI.
  • the second terminal device indicates the resource occupancy of the data channel corresponding to the control channel by setting a specific bit of the control channel to be transmitted, so that the first terminal device that detects the control channel can be valid according to the specific bit. Resource listening.
  • the method further includes: determining, by the second terminal device, that a time domain length for sending the data channel is a length of the second TTI; and the second terminal device according to the second TTI The length, the value on the specific bit is set to a value corresponding to the length of the second TTI.
  • the second terminal device when the second terminal device is the terminal device 30 in FIG. 3, if the terminal device 30 can transmit data based on the first TTI or the second TTI, the specific control channel sent by the terminal device 30
  • the value on the bit can be set to either a value indicating the length of the first TTI or a value indicating the length of the second TTI.
  • the second terminal device may specifically determine the value on the specific bit according to the mapping relationship shown in Table 1.
  • the second terminal device is the terminal device 40 in FIG. 3
  • the data channel is transmitted based on the first TTI
  • the value on the specific bit of the control channel transmitted by the terminal device 40 is a value indicating the length of the first TTI.
  • the first TTI includes multiple second TTIs, and if the value on the specific bit indicates that the time domain length is equal to the length of the second TTI, the value on the multiple bits is further Representing a relative position of the second TTI of the second terminal device for transmitting a data channel in the plurality of second TTIs.
  • the second terminal device may determine the value on the specific bit according to the relative position of the second TTI for transmitting the data channel in the corresponding first TTI in combination with the mapping relationship shown in Table 2.
  • the lengths of the plurality of second TTIs are the same or different.
  • the length of the second TTI is equal to one time slot.
  • control channel carries side downlink control information SCI, and the specific bit is a reserved bit included in the SCI.
  • the first terminal device supports a communication protocol of Release Release-15
  • the second terminal device supports a communication protocol of Release Release-14 and does not support a communication protocol of Release Release-15
  • the specific bit is The value indicates that the time domain length is the length of the first TTI; or the first terminal device supports a communication protocol of the Release Release-15, and the second terminal device supports the communication protocol of the Release Release-15, A value on a particular bit indicates that the time domain length is the length of the first TTI or the length of the second TTI.
  • the size of the sequence numbers of the above processes does not mean the order of execution, and the order of execution of each process should be determined by its function and internal logic, and should not be implemented in the present application.
  • the implementation of the examples constitutes any limitation.
  • FIG. 7 is a schematic block diagram of a terminal device 700 according to an embodiment of the present application.
  • the terminal device is a first terminal device, and the first terminal device 700 includes a transceiver unit 710 and a listening unit 720. among them:
  • the transceiver unit 710 is configured to receive, on the first transmission time interval TTI, a control channel sent by the second terminal device, where the control channel includes a specific bit, where the specific bit is used to indicate that the second terminal device is configured to send The time domain length of the data channel;
  • the listening unit 720 is configured to: if the value on the specific bit indicates that the time domain length is equal to the length of the first TTI, the first terminal device listens to the second based on the first TTI a data channel transmitted by the terminal device;
  • the listening unit 720 is further configured to: if the value on the specific bit indicates that the time domain length is equal to the length of the second TTI, the first terminal device listens to the first TTI based on the second TTI The data channel sent by the second terminal device, the length of the second TTI is smaller than the length of the first TTI.
  • the first terminal device determines the resource occupancy of the data channel corresponding to the control channel by using the information represented by the specific bit in the detected control channel, so that the first terminal device can be valid according to the detected control channel. Resource listening.
  • the first TTI includes multiple second TTIs, and if the value on the specific bit indicates that the time domain length is equal to the length of the second TTI, the value on the multiple bits is further Representing a relative position of the second TTI of the second terminal device for transmitting a data channel in the plurality of second TTIs.
  • the lengths of the plurality of second TTIs are the same or different.
  • the length of the second TTI is equal to one time slot.
  • control channel carries side downlink control information SCI, and the specific bit includes a reserved bit included in the SCI.
  • the first terminal device supports a communication protocol of Release Release-15
  • the second terminal device supports a communication protocol of Release Release-14 and does not support a communication protocol of Release Release-15
  • the specific bit is The value indicates that the time domain length is the length of the first TTI; or the first terminal device supports a communication protocol of the Release Release-15, and the second terminal device supports the communication protocol of the Release Release-15, A value on a particular bit indicates that the time domain length is the length of the first TTI or the length of the second TTI.
  • FIG. 8 is a schematic block diagram of a terminal device 800 according to an embodiment of the present application. As shown in FIG. 8, the terminal device is a second terminal device, and the second terminal device 800 includes a transceiver unit 810. The transceiver unit 810 is configured to:
  • the second terminal device Transmitting the data channel to the first terminal device based on the second TTI, so that the first terminal device determines, according to the value on the specific bit, the second terminal device is configured to send a data channel.
  • the time domain length is the length of the second TTI, and the data channel sent by the second terminal device is intercepted based on the second TTI.
  • the second terminal device indicates the resource occupancy of the data channel corresponding to the control channel by setting a specific bit of the control channel to be sent, so that the first terminal device that detects the control channel can be based on the specific bit Effective resource listening.
  • the terminal device further includes: a determining unit, configured to determine a length of a time domain for transmitting the data channel as a length of the second TTI; and a processing unit, configured to use, according to the length of the second TTI And setting a value on the specific bit to a value corresponding to a length of the second TTI.
  • a determining unit configured to determine a length of a time domain for transmitting the data channel as a length of the second TTI
  • a processing unit configured to use, according to the length of the second TTI And setting a value on the specific bit to a value corresponding to a length of the second TTI.
  • the first TTI includes multiple second TTIs, and if the value on the specific bit indicates that the time domain length is equal to the length of the second TTI, the value on the multiple bits is further Representing a relative position of the second TTI of the second terminal device for transmitting a data channel in the plurality of second TTIs.
  • the lengths of the plurality of second TTIs are the same or different.
  • the length of the second TTI is equal to one time slot.
  • control channel carries side downlink control information SCI, and the specific bit is a reserved bit included in the SCI.
  • the first terminal device supports a communication protocol of version Release-15
  • the second The terminal device supports the communication protocol of Release Release-14 and does not support the communication protocol of Release Release-15
  • the value on the specific bit indicates that the time domain length is the length of the first TTI; or the first terminal The device supports a communication protocol of Release Release-15
  • the second terminal device supports a communication protocol of Release Release-15
  • the value on the specific bit indicates that the time domain length is the length of the first TTI or the length The length of the second TTI.
  • FIG. 9 is a schematic structural diagram of a terminal device 900 according to an embodiment of the present application.
  • the terminal device is a first terminal device, and the first terminal device includes a processor 910, a transceiver 920, and a memory 930, wherein the processor 910, the transceiver 920, and the memory 930 are internally connected.
  • the pathways communicate with each other.
  • the memory 930 is for storing instructions, and the processor 910 is configured to execute instructions stored by the memory 930 to control the transceiver 920 to receive signals or transmit signals.
  • the transceiver 920 is configured to:
  • the processor 910 is configured to: if the value on the specific bit indicates that the time domain length is equal to the length of the first TTI, the first terminal device listens to the second based on the first TTI a data channel sent by the terminal device; if the value on the specific bit indicates that the time domain length is equal to the length of the second TTI, the first terminal device listens to the second terminal based on the second TTI The data channel sent by the terminal device, the length of the second TTI is smaller than the length of the first TTI.
  • the first terminal device determines the resource occupancy of the data channel corresponding to the control channel by using the information represented by the specific bit in the detected control channel, so that the first terminal device can be valid according to the detected control channel. Resource listening.
  • the first TTI includes multiple second TTIs, and if the value on the specific bit indicates that the time domain length is equal to the length of the second TTI, the value on the multiple bits is further Representing a relative position of the second TTI of the second terminal device for transmitting a data channel in the plurality of second TTIs.
  • the lengths of the plurality of second TTIs are the same or different.
  • the length of the second TTI is equal to one time slot.
  • control channel carries side downlink control information SCI, and the specific bit is a reserved bit included in the SCI.
  • the first terminal device supports a communication protocol of version Release-15
  • the second The terminal device supports the communication protocol of Release Release-14 and does not support the communication protocol of Release Release-15
  • the value on the specific bit indicates that the time domain length is the length of the first TTI; or the first terminal The device supports a communication protocol of Release Release-15
  • the second terminal device supports a communication protocol of Release Release-15
  • the value on the specific bit indicates that the time domain length is the length of the first TTI or the length The length of the second TTI.
  • the processor 910 may be a central processing unit (CPU), and the processor 910 may also be another general-purpose processor, a digital signal processor (Digital Signal Processor, DSP). ), Application Specific Integrated Circuit (ASIC), Field Programmable Gate Array (FPGA) or other programmable logic device, discrete gate or transistor logic device, discrete hardware component, and the like.
  • the general purpose processor may be a microprocessor or the processor or any conventional processor or the like.
  • the memory 930 can include read only memory and random access memory and provides instructions and data to the processor 910. A portion of the memory 930 may also include a non-volatile random access memory.
  • each step of the foregoing method may be completed by an integrated logic circuit of hardware in the processor 910 or an instruction in a form of software.
  • the steps of the positioning method disclosed in the embodiment of the present application may be directly implemented by the hardware processor, or may be performed by a combination of hardware and software modules in the processor 910.
  • the software module can be located in a conventional storage medium such as random access memory, flash memory, read only memory, programmable read only memory or electrically erasable programmable memory, registers, and the like.
  • the storage medium is located in the memory 930, and the processor 910 reads the information in the memory 930 and completes the steps of the above method in combination with its hardware. To avoid repetition, it will not be described in detail here.
  • the terminal device 900 according to the embodiment of the present application may correspond to the first terminal device for performing the method 400 in the foregoing method 400, and the terminal device 700 according to the embodiment of the present application, and each unit or module in the terminal device 900 respectively The operations or processes performed by the first terminal device in the above method 400 are performed.
  • the terminal device 700 according to the embodiment of the present application, and each unit or module in the terminal device 900 respectively
  • the operations or processes performed by the first terminal device in the above method 400 are performed.
  • detailed description thereof will be omitted.
  • FIG. 10 is a schematic structural diagram of a terminal device 1000 according to an embodiment of the present application.
  • the terminal device is a second terminal device, and the second terminal device includes a processor 1010, a transceiver 1020, and a memory 1030, wherein the processor 1010, the transceiver 1020, and the memory 1030 are internally connected.
  • the pathways communicate with each other.
  • the memory 1030 is configured to store instructions for executing the instructions stored by the memory 1030 to control the transceiver 1020 to receive signals or transmit signals.
  • the transceiver 1020 is configured to:
  • the second terminal device indicates the resource occupancy of the data channel corresponding to the control channel by setting a specific bit of the control channel to be transmitted, so that the first terminal device that detects the control channel can be valid according to the specific bit. Resource listening.
  • the processor 1010 is configured to: determine a length of a time domain for sending the data channel to be a length of the second TTI; and, according to a length of the second TTI, The value is set to a value corresponding to the length of the second TTI.
  • the first TTI includes multiple second TTIs, and if the value on the specific bit indicates that the time domain length is equal to the length of the second TTI, the value on the multiple bits is further Representing a relative position of the second TTI of the second terminal device for transmitting a data channel in the plurality of second TTIs.
  • the lengths of the plurality of second TTIs are the same or different.
  • the length of the second TTI is equal to one time slot.
  • control channel carries side downlink control information SCI, and the specific bit is a reserved bit included in the SCI.
  • the first terminal device supports a communication protocol of Release Release-15
  • the second terminal device supports a communication protocol of Release Release-14 and does not support a communication protocol of Release Release-15
  • the specific bit is The value indicates that the time domain length is the length of the first TTI; or the first terminal device supports a communication protocol of the Release Release-15, and the second terminal device supports the communication protocol of the Release Release-15, A value on a particular bit indicates that the time domain length is the length of the first TTI or the length of the second TTI.
  • the processor 1010 may be a central processing unit (CPU), and the processor 1010 may also be other general-purpose processors, digital signal processors (DSPs), and application specific integrated circuits. (ASIC), off-the-shelf programmable gate array (FPGA) or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, and more. Pass The processor can be a microprocessor or the processor can be any conventional processor or the like.
  • the memory 1030 can include read only memory and random access memory and provides instructions and data to the processor 1010.
  • a portion of the memory 1030 can also include a non-volatile random access memory.
  • each step of the foregoing method may be completed by an integrated logic circuit of hardware in the processor 1010 or an instruction in a form of software.
  • the steps of the positioning method disclosed in the embodiment of the present application may be directly implemented by the hardware processor, or may be performed by a combination of hardware and software modules in the processor 1010.
  • the software module can be located in a conventional storage medium such as random access memory, flash memory, read only memory, programmable read only memory or electrically erasable programmable memory, registers, and the like.
  • the storage medium is located in the memory 1030, and the processor 1010 reads the information in the memory 1030 and performs the steps of the above method in combination with its hardware. To avoid repetition, it will not be described in detail here.
  • the terminal device 1000 according to the embodiment of the present application may correspond to the second device for performing the method 600 in the foregoing method 600, and the terminal device 800 according to the embodiment of the present application, and each unit or module in the terminal device 1000 is used separately.
  • the operations or processes performed by the second terminal device in the above method 600 are performed.
  • a detailed description thereof will be omitted.
  • FIG. 11 is a schematic structural diagram of a system chip according to an embodiment of the present application.
  • the system chip 1100 of FIG. 11 includes an input interface 1101, an output interface 1102, at least one processor 1103, and a memory 1104.
  • the input interface 1101, the output interface 1102, the processor 1103, and the memory 1104 are interconnected by an internal connection path.
  • the processor 1103 is configured to execute code in the memory 1104.
  • the processor 1103 can implement the method 400 performed by the terminal device in the method embodiment. For the sake of brevity, it will not be repeated here.
  • the processor 1103 can implement the method 600 performed by the network device in the method embodiment. For the sake of brevity, it will not be repeated here.
  • the disclosed systems, devices, and methods may be implemented in other manners.
  • the device embodiments described above are merely illustrative.
  • the division of the unit is only a logical function division.
  • there may be another division manner for example, multiple units or components may be combined or may be Integrate into another system, or some features can be ignored or not executed.
  • the mutual coupling or direct coupling or communication connection shown or discussed may be an indirect coupling or communication connection through some interface, device or unit, and may be in an electrical, mechanical or other form.
  • the units described as separate components may or may not be physically separated, and the components displayed as units may or may not be physical units, that is, may be located in one place, or may be distributed to multiple network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of the embodiment.
  • each functional unit in each embodiment of the present application may be integrated into one monitoring unit, or each unit may exist physically separately, or two or more units may be integrated into one unit.
  • This functionality if implemented as a software functional unit and sold or used as a standalone product, can be stored on a computer readable storage medium.
  • the technical solution of the present application which is essential or contributes to the prior art, or a part of the technical solution, may be embodied in the form of a software product, which is stored in a storage medium, including The instructions are used to cause a computer device (which may be a personal computer, server, or network device, etc.) to perform all or part of the steps of the methods described in various embodiments of the present application.
  • the foregoing storage medium includes: a U disk, a mobile hard disk, a read-only memory (ROM), a random access memory (RAM), a magnetic disk, or an optical disk, and the like, which can store program codes. .

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Abstract

本申请公开了一种D2D通信的方法和终端设备，该方法包括：第一终端设备在第一TTI上接收第二终端设备发送的控制信道，该控制信道的特定比特位用于指示第二终端设备用于发送数据信道的时域长度；若特定比特位上的值表示该时域长度等于第一TTI长度，第一终端设备基于第一TTI侦听第二终端设备发送的数据信道；若特定比特位上的值表示该时域长度等于第二TTI的长度，第一终端设备基于第二TTI侦听第二终端设备发送的数据信道。因此第一终端设备能够根据检测到的控制信道有效地进行资源侦听。

Description

设备对设备通信的方法和终端设备 技术领域
本申请实施例涉及无线通信领域，并且更具体地，涉及一种设备对设备(Device to Device，D2D)通信的方法和终端设备。
背景技术
车联网或称车到设备(Vehicle to X，V2X)通信系统是基于D2D通信的一种侧行链路(Sidelink，SL)传输技术，与传统的长期演进(Long Term Evolution，LTE)系统中通过基站接收或者发送数据的方式不同，车联网系统采用终端到终端直接通信的方式，因此具有更高的频谱效率和更低的传输时延。
在车联网系统中，终端通过控制信道指示用于传输数据信道的数据信道资源，并且在相应数据信道资源上进行数据传输，以及在该数据信道资源对应的控制信道资源上传输该数据信道对应的控制信道。在第三代合作伙伴项目(the 3rd Generation Partnership Project，3GPP)协议的版本Release-14中，终端基于传输时间间隔(Transmission Time Interval，TTI)进行控制信道和数据信道的传输，并且数据信道和其对应的控制信道在相同的TTI中传输。但是，对于新版本Release-15中的终端来说，为了减少时延，控制信道和数据信道可以在一个短TTI(short TTI，sTTI)内传输。为了使Release-14的终端也能够检测到Release-15的终端发送的控制信道，Release-15的终端可以同时发送两种控制信道，一种是基于TTI传输的控制信道(可以称为正常的控制信道)，另一种是基于sTTI传输的控制信道(可以称为短控制信道)。
但是，如果Release-15的终端检测到正常的控制信道，就无法确定该正常的控制信道是Release-15的终端发送的控制信道，还是另一个Release-14的终端发送的控制信道，也就无法确定是基于TTI进行资源侦听还是基于sTTI进行资源侦听。
发明内容
本申请实施例提供了一种D2D通信的方法和终端设备，终端设备能够根据检测到的控制信道有效地进行资源侦听。
第一方面，提供了一种D2D通信的方法，包括：第一终端设备在第一传输时间间隔TTI上接收第二终端设备发送的控制信道，所述控制信道包括特定比特位，所述特定比特位用于指示所述第二终端设备用于发送数据信道的时域长度；若所述特定比特位上的值表示所述时域长度等于所述第一TTI的长度，所述第一终端设备基于所述第一TTI，侦听所述第二终端设备发送的数据信道；若所述特定比特位上的值表示所述时域长度等于所述第二TTI的长度，所述第一终端设备基于所述第二TTI，侦听所述第二终端设备发送的所述数据信道，所述第二TTI的长度小于所述第一TTI的长度。
因此，第一终端设备通过检测到的控制信道中的特定比特位所表示的信息，来确定该控制信道对应的数据信道的资源占用情况，从而使第一终端设备能够根据检测到的控制信道有效地进行资源侦听。
在一种可能的实现方式中，所述第一TTI包括多个第二TTI，若所述特定比特位上的值表示所述时域长度等于所述第二TTI的长度，所述多个比特位上的值还表示所述第二终端设备用于发送数据信道的所述第二TTI在所述多个第二TTI中的相对位置。
在一种可能的实现方式中，所述多个第二TTI的长度相同或者不同。
在一种可能的实现方式中，所述第二TTI的长度等于一个时隙。
在一种可能的实现方式中，所述控制信道承载侧行链路控制信息SCI，所述特定比特位为SCI中包括的预留比特位。
在一种可能的实现方式中，所述第一终端设备支持版本Release-15的通信协议，所述第二终端设备支持版本Release-14的通信协议且不支持版本Release-15的通信协议，所述特定比特位上的值表示所述时域长度为所述第一TTI的长度；或者所述第一终端设备支持版本Release-15的通信协议，所述第二终端设备支持版本Release-15的通信协议，所述特定比特位上的值表示所述时域长度为所述第一TTI的长度或者所述第二TTI的长度。
第二方面，提供了一种D2D通信的方法，包括：第二终端设备基于第一TTI向第一终端设备发送控制信道，所述控制信道包括特定比特位，所述特定比特位用于指示所述第二终端设备用于发送数据信道的时域长度为第二TTI的长度，所述第二TTI的长度小于所述第一TTI的长度；所述第二终端设备基于所述第二TTI向所述第一终端设备发送所述数据信道，以便于所述第一终端设备根据所述特定比特位上的值，确定所述第二终端设备用于发 送数据信道的时域长度为所述第二TTI的长度，并基于所述第二TTI侦听所述第二终端设备发送的所述数据信道。
因此，第二终端设备通过设置待发送的控制信道的特定比特位来指示该控制信道对应的数据信道的资源占用情况，从而使检测到该控制信道的第一终端设备能够根据该特定比特位有效地进行资源侦听。
在一种可能的实现方式中，所述第二终端设备确定用于发送所述数据信道的时域长度为所述第二TTI的长度；所述第二终端设备根据所述第二TTI的长度，将所述特定比特位上的值设置为与所述第二TTI的长度对应的值。
在一种可能的实现方式中，所述第一TTI包括多个第二TTI，若所述特定比特位上的值表示所述时域长度等于所述第二TTI的长度，所述多个比特位上的值还表示所述第二终端设备用于发送数据信道的所述第二TTI在所述多个第二TTI中的相对位置。
在一种可能的实现方式中，所述多个第二TTI的长度相同或者不同。
在一种可能的实现方式中，所述第二TTI的长度等于一个时隙。
在一种可能的实现方式中，所述控制信道承载侧行链路控制信息SCI，所述特定比特位为SCI中包括的预留比特位。
在一种可能的实现方式中，所述第一终端设备支持版本Release-15的通信协议，所述第二终端设备支持版本Release-14的通信协议且不支持版本Release-15的通信协议，所述特定比特位上的值表示所述时域长度为所述第一TTI的长度；或者所述第一终端设备支持版本Release-15的通信协议，所述第二终端设备支持版本Release-15的通信协议，所述特定比特位上的值表示所述时域长度为所述第一TTI的长度或者所述第二TTI的长度。
第三方面，提供了一种终端设备，该终端设备可以执行上述第一方面或第一方面的任意可选的实现方式中的第一终端设备的操作。具体地，该终端设备可以包括用于执行上述第一方面或第一方面的任意可能的实现方式中的第一终端设备的操作的模块单元。
第四方面，提供了一种终端设备，该终端设备可以执行上述第二方面或第二方面的任意可选的实现方式中的第二终端设备的操作。具体地，该终端设备可以包括用于执行上述第二方面或第二方面的任意可能的实现方式中的第二终端设备的操作的模块单元。
第五方面，提供了一种终端设备，该终端设备包括：处理器、收发器和 存储器。其中，该处理器、收发器和存储器之间通过内部连接通路互相通信。该存储器用于存储指令，该处理器用于执行该存储器存储的指令。当该处理器执行该存储器存储的指令时，该执行使得该终端设备执行第一方面或第一方面的任意可能的实现方式中的方法，或者该执行使得该终端设备实现第三方面提供的终端设备。
第六方面，提供了一种终端设备，该终端设备包括：处理器、收发器和存储器。其中，该处理器、收发器和存储器之间通过内部连接通路互相通信。该存储器用于存储指令，该处理器用于执行该存储器存储的指令。当该处理器执行该存储器存储的指令时，该执行使得该终端设备执行第二方面或第二方面的任意可能的实现方式中的方法，或者该执行使得该终端设备实现第四方面提供的终端设备。
第七方面，提供了一种计算机可读存储介质，所述计算机可读存储介质存储有程序，所述程序使得终端设备执行上述第一方面，及其各种实现方式中的任一种D2D通信的方法。
第八方面，提供了一种计算机可读存储介质，所述计算机可读存储介质存储有程序，所述程序使得终端设备执行上述第二方面，及其各种实现方式中的任一种D2D通信的方法。
第九方面，提供了一种系统芯片，该系统芯片包括输入接口、输出接口、处理器和存储器，该处理器用于执行该存储器存储的指令，当该指令被执行时，该处理器可以实现前述第一方面或第一方面的任意可能的实现方式中的方法。
第十方面，提供了一种系统芯片，该系统芯片包括输入接口、输出接口、处理器和存储器，该处理器用于执行该存储器存储的指令，当该指令被执行时，该处理器可以实现前述第二方面或第二方面的任意可能的实现方式中的方法。
第十一方面，提供了一种包括指令的计算机程序产品，当所述计算机程序产品在计算机上运行时，使得该计算机执行上述第一方面或第一方面的任意可能的实现方式中的方法。
第十二方面，提供了一种包括指令的计算机程序产品，当所述计算机程序产品在计算机上运行时，使得该计算机执行上述第二方面或第二方面的任意可能的实现方式中的方法。
附图说明
图1是本申请实施例的一种应用场景的示意性架构图。
图2是终端设备用于传输控制信道和数据信道的资源示意图。
图3是终端设备用于传输控制信道和数据信道的资源示意图。
图4是本申请实施例的D2D通信的方法的示意性流程图。
图5是本申请实施例的第一TTI和第二TTI的示意图。
图6是本申请实施例的D2D通信的方法的示意性流程图。
图7是本申请实施例的第一终端设备的示意性框图。
图8是本申请实施例的第二终端设备的示意性框图。
图9是本申请实施例的第一终端设备的示意性结构图。
图10是本申请实施例的第二终端设备的示意性结构图。
图11是本申请实施例的系统芯片的示意性结构图。
具体实施方式
下面将结合附图，对本申请实施例中的技术方案进行描述。
应理解，本申请实施例的技术方案可以应用于各种通信系统，例如：全球移动通讯(Global System of Mobile Communication，GSM)系统、码分多址(Code Division Multiple Access，CDMA)系统、宽带码分多址(Wideband Code Division Multiple Access，WCDMA)系统、长期演进(Long Term Evolution，LTE)系统、LTE频分双工(Frequency Division Duplex，FDD)系统、LTE时分双工(Time Division Duplex，TDD)、通用移动通信系统(Universal Mobile Telecommunication System，UMTS)、以及未来的5G通信系统等。
本申请结合终端设备描述了各个实施例。终端设备也可以指用户设备(User Equipment，UE)、接入终端、用户单元、用户站、移动站、移动台、远方站、远程终端、移动设备、用户终端、终端、无线通信设备、用户代理或用户装置。接入终端可以是蜂窝电话、无绳电话、会话启动协议(Session Initiation Protocol，SIP)电话、无线本地环路(Wireless Local Loop，WLL)站、个人数字处理(Personal Digital Assistant，PDA)、具有无线通信功能的手持设备、计算设备或连接到无线调制解调器的其它处理设备、车载设备、 可穿戴设备，未来5G网络中的终端设备或者未来演进的陆上公用移动通信网(Public Land Mobile Network，PLMN)网络中的终端设备等。
本申请结合网络设备描述了各个实施例。网络设备可以是用于与终端设备进行通信的设备，例如，可以是GSM系统或CDMA中的基站(Base Transceiver Station，BTS)，也可以是WCDMA系统中的基站(NodeB，NB)，还可以是LTE系统中的演进型基站(Evolutional Node B，eNB或eNodeB)，或者该网络设备可以为中继站、接入点、车载设备、可穿戴设备以及未来5G网络中的网络侧设备或未来演进的PLMN网络中的网络侧设备等。
图1是本申请实施例的一个应用场景的示意图。图1示例性地示出了一个网络设备即网络设备10，以及三个终端设备即终端设备20、终端设备30和终端设备40，可选地，该无线通信系统可以包括多个网络设备并且每个网络设备的覆盖范围内可以包括其它数量的终端设备，本发明实施例对此不做限定。此外，该无线通信系统还可以包括移动管理实体(Mobile Management Entity，MME)、服务网关(Serving Gateway，S-GW)、分组数据网络网关(Packet Data Network Gateway，P-GW)等其他网络实体，但本发明实施例不限于此。
具体地，终端设备20、终端设备30和终端设备40可以蜂窝通信模式或D2D通信模式进行通信，其中，在蜂窝通信模式中，终端设备通过与网络设备之间的蜂窝链路与其它终端设备通信；在D2D通信模式中，两个终端设备通过D2D链路即侧行链路(Sidelink，SL)直接进行通信。
D2D通信可以指车对车(Vehicle to Vehicle，简称“V2V”)通信或车辆到其他设备(Vehicle to Everything，V2X)通信。在V2X通信中，X可以泛指任何具有无线接收和发送能力的设备，例如但不限于慢速移动的无线装置，快速移动的车载设备，或是具有无线发射接收能力的网络控制节点等。应理解，本发明实施例主要应用于V2X通信的场景，但也可以应用于任意其它D2D通信场景，本发明实施例对此不做任何限定。
在车联网系统中，终端设备20可以发送侧行链路控制信息(Sidelink Control Information，SCI)。该SCI携带与终端设备20的数据传输相关的信息，例如调制编码方式(Modulation and Coding Scheme，MCS)、时频资源分配信息、资源预留信息等。检测到该SCI的终端设备30或终端设备40可以通过该SCI获得终端设备20进行数据传输所使用的时频资源的位置以及 资源预留信息等，从而判断终端设备20的资源使用情况。如果终端设备30或终端设备40不能成功检测到该资源调度信息，则可以测量所有传输资源上的能量，并且根据能量高低对所有传输资源进行排序，优先选取能量低的传输资源进行自己的数据传输。
在3GPP协议的版本Release-14(Rel-14)中，物理侧行链路控制信道(Physical Sideline Control CHannel，PSCCH)上承载该SCI，SCI例如可以使用特定格式(format)例如format 1，其中SCI format 1中包括PSSCH对应的控制信息，例如MCS、时频资源指示信息、优先级信息、资源预留信息、重传指示信息等，SCI format 1还包括预留比特位，在版本Release-14中，该SCI的所有预留比特位的值均置为0。
应注意，SCI中的资源预留信息(Resource Reservation)与SCI的预留比特位(Reserved Information Bits)是不同的。SCI中的资源预留信息一般包括4比特，用来表示终端设备是否为后续的数据传输预留相应的传输资源。而SCI的预留比特位是暂时未被使用的比特位，一般被置为0。
在3GPP协议的版本Release-15(Rel-15)中，引入了短TTI(short TTI，sTTI)，并且要求支持Release-15的终端设备使用sTTI传输数据信道，且支持Release-15的终端设备与支持Release-14(Rel-14)的终端设备可以共资源池进行数据传输，这样就对支持Release-14的终端设备的资源侦听和选取过程产生了较大的影响。因此需要Release-14的终端设备能够检测Release-15的终端设备发送SCI例如资源调度信息或称调度分配(Scheduling Assignment，SA)信息，以获知Release-15的终端设备的资源占用情况，从而进行资源的侦听和选取。这就需要Release-15的终端设备能够发送与Release-14版本兼容的正常的控制信道。但是对于新版本Release-15的终端设备来说，为了减少时延，控制信道和可以和数据信道同样在一个sTTI内传输，即Release-15的终端设备可以在sTTI上发送短的控制信道，例如在sTTI上发送短调度分配(short SA，sSA)信息。Release-15的终端设备可以通过检测sSA获取该控制信道的内容，并且根据该sSA确定数据信道资源的位置并进行数据信道的检测，而不需要等到1ms的TTI(即正常TTI(normal TTI))结束后才完成控制信道的检测，从而降低时延。
也就是说，一方面，Release-14的终端设备需要检测Release-15的终端设备发送的控制信道，以用来获取Release-15的终端设备的资源占用情况， 从而进行资源侦听和选取。另一方面，Release-15的终端设备也需要检测Release-15的终端设备发送的控制信道，以用来获取Release-15的终端设备的资源占用情况，从而进行资源侦听和选取。因此，例如图2所示的控制信道和数据信道所使用的资源，Release-15的终端设备即需要在sTTI上发送的short SA和数据信道，还需要在TTI上发送正常的SA。
由于Release-14的终端设备和Release-15的终端设备可能同时存在，因此，如果某个Release-15的终端设备检测到正常的SA的情况下，就无法识别出该SA是Release-14的终端设备发出的，还是Release-15的终端设备发出的。如果该SA是Release-14的终端设备发出的，该SA指示的用于传输数据信道的频域资源在一个子帧内都是被占用的；如果该SA是Release-15的终端设备发出的，那么发送该SA的终端设备还会同时发送short SA并基于sTTI发送数据信道，short SA和基于sTTI发送的数据信道只占了一个子帧中的部分资源，因此接收到该SA的终端设备需要根据short SA的内容来判断具体的数据信道的资源占用情况。
例如图3所示，假设终端设备20和终端设备30为Release-15的终端设备，终端设备40为Release-14的终端设备。终端设备20接收到终端设备30发送的SA时，应当根据short SA的内容确定终端设备30的数据信道的资源占用情况，而不是根据接收到的SA的内容确定终端设备30的数据信道的资源占用情况；终端设备20接收到终端设备40发送的SA时，可以直接根据该SA的内容确定终端设备40的数据信道的资源占用情况。但是终端设备20接收到某个SA时，并不能区分该SA是终端设备30发送的还是终端设备40发送的，也就无法判断是否应当根据接收到的SA来确定数据信道资源。
因此，本申请实施例中，终端设备通过控制信道中的特定比特位所表示的信息，来确定该控制信道对应的数据信道的资源占用情况，从而使终端设备能够根据检测到的控制信道有效地进行资源侦听。
应理解，本申请实施例中，将支持版本Release-14的通信协议且不支持Release-15的通信协议的终端设备，简称为Release-14的终端设备，将支持版本Release-15的通信协议的终端设备简称为Release-15的终端设备。其中，Release-15的终端设备可以包括支持Release-15的终端设备或者支持Release-15的其他版本的终端设备，例如支持Release-15的Release-16的终端设备。
图4是本申请实施例的D2D通信的方法的示意性流程图。图4所示的方法可以由第一终端设备执行，第一终端设备例如可以为图1中所示的终端设备20，第二终端设备例如可以是图1中所示的终端设备30或终端设备40。如图4所示，该D2D通信的方法包括：
在410中，第一终端设备在第一TTI上接收第二终端设备发送的控制信道。
其中，该控制信道包括特定比特位，该特定比特位用于指示第二终端设备用于发送数据信道的时域长度。
具体地说，第一终端设备基于第一TTI接收第二终端设备发送的控制信道，该控制信道例如可以承载有SCI，该SCI可以包括该特定比特位，且该特定比特位可以用于指示第二终端设备用于发送数据信道的时域长度。第一终端设备根据该特定比特位上的值，可以判断第二终端设备用于发送数据信道的时域长度为第一TTI的长度还是第二TTI的长度，从而基于相应的TTI长度侦听第二终端设备发送的数据信道。
例如表一所示的特定比特位与数据信道的时域长度之间的映射关系，若特定比特位上的值为0，则表明第二终端设备用于发送数据信道的时域长度等于第一TTI的长度，即该控制信道所对应的数据信道的时域长度为第一TTI的长度，这时，第二终端设备例如可以为图3中所示的支持版本Release-14的3GPP协议的终端设备40；若特定比特位上的值为1，则表明第二终端设备用于发送数据信道的时域长度等于第二TTI的长度，即该控制信道所对应的数据信道的时域长度为第二TTI的长度，这时，第二终端设备例如可以为图3中所示的支持版本Relesae-15的3GPP协议的终端设备30。其中，第二TTI的长度小于第一TTI的长度，例如第一TTI等于一个子帧即1ms，第二TTI等于一个时隙即0.5ms。
表一
特定比特位 数据信道的时域长度
0 第一TTI
1 第二TTI
如果特定比特位上的值表示第二终端设备用于发送数据信道的时域长度等于该第一TTI的长度，那么第一终端设备执行420；如果特定比特位上 的值表示第二终端设备用于发送数据信道的时域长度等于该第二TTI的长度，那么第一终端设备执行430。
在420中，若该特定比特位上的值表示该时域长度等于第一TTI的长度，第一终端设备基于第一TTI，侦听第二终端设备发送的数据信道。
在430中，若该特定比特位上的值表示该时域长度等于第二TTI的长度，第一终端设备基于第二TTI，侦听第二终端设备发送的该数据信道。
因此，第一终端设备通过检测到的控制信道中的特定比特位所表示的信息，来确定该控制信道对应的数据信道的资源占用情况，从而使第一终端设备能够根据检测到的控制信道有效地进行资源侦听。
可选地，第二终端设备发送的该控制信道承载有侧行链路控制信息SCI，该特定比特位为该SCI中包括的预留比特位。
可选地，该第一TTI包括多个第二TTI，若该特定比特位上的值表示该时域长度等于该第二TTI的长度，该多个比特位上的值还可以表示第二终端设备用于发送数据信道的该第二TTI在该多个第二TTI中的相对位置。
也就是说，控制信道中的特定比特位不仅可以指示第二终端设备用于发送数据信道的时域长度为第一TTI的长度还是第二TTI的长度，还可以指示第二TTI的相对位置。例如图5所示，假设第一TTI的长度为一个子帧的长度即1ms，第二TTI的长度为一个时隙的长度即0.5ms，那么，一个第一TTI就对应于两个第二TT。如图5所示，第二终端设备基于第二TTI发送其数据信道，且该数据信道占用的第二TTI，为该第二TTI对应的第一TTI中的前一个TTI(即第一个第二TTI)。那么第二终端设备可以按照表二所示的特定比特位与时域长度之间的映射关系，将其发送的控制信道的特定比特位上的值设置为01，第一终端设备在检测到该控制信道后，就可以根据该特定比特位上的值，确定第二终端设备在每个第一TTI的前一个第二TTI上传输数据，并基于该第二TTI侦听第二终端设备的数据信道。
表二
特定比特位 数据信道的时域长度
00 第一TTI
01 第一个第二TTI
10 第二个第二TTI
应理解，图5中所示的第一TTI中包括两个第二TTI，且两个第二TTI长度相等(均等于一个时隙长)。但是，本申请实施例中，第一TTI对应的多个第二TTI的长度可以相同，也可以不同。例如，第一TTI对应4个第二TTI，且这4个第二TTI的长度分别等于4个时域符号、3个时域符号、3个时域符号和4个时域符号的长度。
还应理解，第二终端设备为图3中的终端设备30时，发送的数据信道可以是如图5所示的基于第二TTI发送的数据信道，当然，终端设备30也可以基于第一TTI发送该数据信道，本申请实施例对此不作限定。如果终端设备30既可以基于第一TTI发送数据，也可以基于第二TTI发送数据时，终端设备30发送的控制信道的特定比特位上的值既可以设置为表示该第一TTI的长度的值，也可以设置为表示第二TTI长度的值。
而第二终端设备为图3中的终端设备40时，是基于第一TTI发送数据信道，终端设备40发送的控制信道的特定比特位上的值为表示该第一TTI的长度的值。
也就是说，若第一终端设备支持版本Release-15的通信协议，第二终端设备支持版本Release-14的通信协议且不支持版本Release-15的通信协议，该特定比特位上的值表示该时域长度为该第一TTI的长度；或者，若第一终端设备支持版本Release-15的通信协议，第二终端设备支持版本Release-15的通信协议，该特定比特位上的值表示该时域长度为该第一TTI的长度，或者为该第二TTI的长度。
图6是本申请实施例的D2D通信的方法的示意性流程图。图6所示的方法可以由第二终端设备执行，该第二终端设备例如可以为图1中所示的终端设备30或终端设备40。如图6所示，该D2D通信的方法包括：
在610中，第二终端设备基于第一TTI向第一终端设备发送控制信道，所述控制信道包括特定比特位，所述特定比特位用于指示所述第二终端设备用于发送数据信道的时域长度为第二TTI的长度，所述第二TTI的长度小于所述第一TTI的长度。
在620中，所述第二终端设备基于所述第二TTI向所述第一终端设备发送所述数据信道，以便于所述第一终端设备根据所述特定比特位上的值，确定所述第二终端设备用于发送数据信道的时域长度为所述第二TTI的长度，并基于所述第二TTI侦听所述第二终端设备发送的所述数据信道。
因此，第二终端设备通过设置待发送的控制信道的特定比特位来指示该控制信道对应的数据信道的资源占用情况，从而使检测到该控制信道的第一终端设备能够根据该特定比特位有效地进行资源侦听。
可选地，所述方法还包括：所述第二终端设备确定用于发送所述数据信道的时域长度为所述第二TTI的长度；所述第二终端设备根据所述第二TTI的长度，将所述特定比特位上的值设置为与所述第二TTI的长度对应的值。
举例来说，第二终端设备为图3中的终端设备30时，如果终端设备30既可以基于第一TTI发送数据，也可以基于第二TTI发送数据时，终端设备30发送的控制信道的特定比特位上的值既可以设置为表示所述第一TTI的长度的值，也可以设置为表示第二TTI长度的值。第二终端设备具体可以根据表一所示的映射关系来确定该特定比特位上的值。而第二终端设备为图3中的终端设备40时，是基于第一TTI发送数据信道，终端设备40发送的控制信道的特定比特位上的值为表示所述第一TTI的长度的值。
可选地，所述第一TTI包括多个第二TTI，若所述特定比特位上的值表示所述时域长度等于所述第二TTI的长度，所述多个比特位上的值还表示所述第二终端设备用于发送数据信道的所述第二TTI在所述多个第二TTI中的相对位置。
例如，第二终端设备可以根据用于传输数据信道的第二TTI在对应的第一TTI中的相对位置，结合表二所示的映射关系，确定该特定比特位上的值。
可选地，所述多个第二TTI的长度相同或者不同。
可选地，所述第二TTI的长度等于一个时隙。
可选地，所述控制信道承载侧行链路控制信息SCI，所述特定比特位为所述SCI中包括的预留比特位。
可选地，所述第一终端设备支持版本Release-15的通信协议，所述第二终端设备支持版本Release-14的通信协议且不支持版本Release-15的通信协议，所述特定比特位上的值表示所述时域长度为所述第一TTI的长度；或者所述第一终端设备支持版本Release-15的通信协议，所述第二终端设备支持版本Release-15的通信协议，所述特定比特位上的值表示所述时域长度为所述第一TTI的长度或者所述第二TTI的长度。
应理解，对于第二终端设备的控制信道的特定比特位的具体描述，可以参考前述图3至图5、以及表一和表二中对第一终端设备的相关描述，为了 简洁，这里不再赘述。
还应理解，在本申请的各种实施例中，上述各过程的序号的大小并不意味着执行顺序的先后，各过程的执行顺序应以其功能和内在逻辑确定，而不应对本申请实施例的实施过程构成任何限定。
上文中详细描述了根据本申请实施例的D2D通信的方法，下面将结合图7至图11，描述根据本申请实施例的装置，方法实施例所描述的技术特征适用于以下装置实施例。
图7是根据本申请实施例的终端设备700的示意性框图。如图7所示，该终端设备为第一终端设备，该第一终端设备700包括收发单元710和侦听单元720。其中：
收发单元710，用于在第一传输时间间隔TTI上接收第二终端设备发送的控制信道，所述控制信道包括特定比特位，所述特定比特位用于指示所述第二终端设备用于发送数据信道的时域长度；
侦听单元720，用于若所述特定比特位上的值表示所述时域长度等于所述第一TTI的长度，所述第一终端设备基于所述第一TTI，侦听所述第二终端设备发送的数据信道；
侦听单元720还用于，若所述特定比特位上的值表示所述时域长度等于所述第二TTI的长度，所述第一终端设备基于所述第二TTI，侦听所述第二终端设备发送的所述数据信道，所述第二TTI的长度小于所述第一TTI的长度。
因此，第一终端设备通过检测到的控制信道中的特定比特位所表示的信息，来确定该控制信道对应的数据信道的资源占用情况，从而使第一终端设备能够根据检测到的控制信道有效地进行资源侦听。
可选地，所述第一TTI包括多个第二TTI，若所述特定比特位上的值表示所述时域长度等于所述第二TTI的长度，所述多个比特位上的值还表示所述第二终端设备用于发送数据信道的所述第二TTI在所述多个第二TTI中的相对位置。
可选地，所述多个第二TTI的长度相同或者不同。
可选地，所述第二TTI的长度等于一个时隙。
可选地，所述控制信道承载侧行链路控制信息SCI，所述特定比特位包括所述SCI中包括的预留比特位。
可选地，所述第一终端设备支持版本Release-15的通信协议，所述第二终端设备支持版本Release-14的通信协议且不支持版本Release-15的通信协议，所述特定比特位上的值表示所述时域长度为所述第一TTI的长度；或者所述第一终端设备支持版本Release-15的通信协议，所述第二终端设备支持版本Release-15的通信协议，所述特定比特位上的值表示所述时域长度为所述第一TTI的长度或者所述第二TTI的长度。
图8是根据本申请实施例的终端设备800的示意性框图。如图8所示，该终端设备为第二终端设备，该第二终端设备800包括收发单元810。该收发单元810用于：
基于第一TTI向第一终端设备发送控制信道，所述控制信道包括特定比特位，所述特定比特位用于指示所述第二终端设备用于发送数据信道的时域长度为第二TTI的长度，所述第二TTI的长度小于所述第一TTI的长度；
基于所述第二TTI向所述第一终端设备发送所述数据信道，以便于所述第一终端设备根据所述特定比特位上的值，确定所述第二终端设备用于发送数据信道的时域长度为所述第二TTI的长度，并基于所述第二TTI侦听所述第二终端设备发送的所述数据信道。
因此，第二终端设备通过设置待发送的控制信道的特定比特位，来指示该控制信道对应的数据信道的资源占用情况，从而使检测到该控制信道的第一终端设备能够根据该特定比特位有效地进行资源侦听。
可选地，所述终端设备还包括：确定单元，用于确定用于发送所述数据信道的时域长度为所述第二TTI的长度；处理单元，用于根据所述第二TTI的长度，将所述特定比特位上的值设置为与所述第二TTI的长度对应的值。
可选地，所述第一TTI包括多个第二TTI，若所述特定比特位上的值表示所述时域长度等于所述第二TTI的长度，所述多个比特位上的值还表示所述第二终端设备用于发送数据信道的所述第二TTI在所述多个第二TTI中的相对位置。
可选地，所述多个第二TTI的长度相同或者不同。
可选地，所述第二TTI的长度等于一个时隙。
可选地，所述控制信道承载侧行链路控制信息SCI，所述特定比特位为所述SCI中包括的预留比特位。
可选地，所述第一终端设备支持版本Release-15的通信协议，所述第二 终端设备支持版本Release-14的通信协议且不支持版本Release-15的通信协议，所述特定比特位上的值表示所述时域长度为所述第一TTI的长度；或者所述第一终端设备支持版本Release-15的通信协议，所述第二终端设备支持版本Release-15的通信协议，所述特定比特位上的值表示所述时域长度为所述第一TTI的长度或者所述第二TTI的长度。
图9是根据本申请实施例的终端设备900的示意性结构图。如图9所示，该终端设备为第一终端设备，该第一终端设备包括处理器910、收发器920和存储器930，其中，该处理器910、收发器920和存储器930之间通过内部连接通路互相通信。该存储器930用于存储指令，该处理器910用于执行该存储器930存储的指令，以控制该收发器920接收信号或发送信号。其中，该收发器920用于：
在第一传输时间间隔TTI上接收第二终端设备发送的控制信道，所述控制信道包括特定比特位，所述特定比特位用于指示所述第二终端设备用于发送数据信道的时域长度；
该处理器910用于：若所述特定比特位上的值表示所述时域长度等于所述第一TTI的长度，所述第一终端设备基于所述第一TTI，侦听所述第二终端设备发送的数据信道；若所述特定比特位上的值表示所述时域长度等于所述第二TTI的长度，所述第一终端设备基于所述第二TTI，侦听所述第二终端设备发送的所述数据信道，所述第二TTI的长度小于所述第一TTI的长度。
因此，第一终端设备通过检测到的控制信道中的特定比特位所表示的信息，来确定该控制信道对应的数据信道的资源占用情况，从而使第一终端设备能够根据检测到的控制信道有效地进行资源侦听。
可选地，所述第一TTI包括多个第二TTI，若所述特定比特位上的值表示所述时域长度等于所述第二TTI的长度，所述多个比特位上的值还表示所述第二终端设备用于发送数据信道的所述第二TTI在所述多个第二TTI中的相对位置。
可选地，所述多个第二TTI的长度相同或者不同。
可选地，所述第二TTI的长度等于一个时隙。
可选地，所述控制信道承载侧行链路控制信息SCI，所述特定比特位为所述SCI中包括的预留比特位。
可选地，所述第一终端设备支持版本Release-15的通信协议，所述第二 终端设备支持版本Release-14的通信协议且不支持版本Release-15的通信协议，所述特定比特位上的值表示所述时域长度为所述第一TTI的长度；或者所述第一终端设备支持版本Release-15的通信协议，所述第二终端设备支持版本Release-15的通信协议，所述特定比特位上的值表示所述时域长度为所述第一TTI的长度或者所述第二TTI的长度。
应理解，在本申请实施例中，该处理器910可以是中处理测单元(Central Processing Unit，CPU)，该处理器910还可以是其他通用处理器、数字信号处理器(Digital Signal Processor，DSP)、专用集成电路(Application Specific Integrated Circuit，ASIC)、现成可编程门阵列(Field Programmable Gate Array，FPGA)或者其他可编程逻辑器件、分立门或者晶体管逻辑器件、分立硬件组件等。通用处理器可以是微处理器或者该处理器也可以是任何常规的处理器等。
该存储器930可以包括只读存储器和随机存取存储器，并向处理器910提供指令和数据。存储器930的一部分还可以包括非易失性随机存取存储器。
在实现过程中，上述方法的各步骤可以通过处理器910中的硬件的集成逻辑电路或者软件形式的指令完成。结合本申请实施例所公开的定位方法的步骤可以直接体现为硬件处理器执行完成，或者用处理器910中的硬件及软件模块组合执行完成。软件模块可以位于随机存储器，闪存、只读存储器，可编程只读存储器或者电可擦写可编程存储器、寄存器等本领域成熟的存储介质中。该存储介质位于存储器930，处理器910读取存储器930中的信息，结合其硬件完成上述方法的步骤。为避免重复，这里不再详细描述。
根据本申请实施例的终端设备900可以对应于上述方法400中用于执行方法400的第一终端设备，以及根据本申请实施例的终端设备700，且该终端设备900中的各单元或模块分别用于执行上述方法400中第一终端设备所执行的各动作或处理过程，这里，为了避免赘述，省略其详细说明。
图10是根据本申请实施例的终端设备1000的示意性结构图。如图10所示，该终端设备为第二终端设备，该第二终端设备包括处理器1010、收发器1020和存储器1030，其中，该处理器1010、收发器1020和存储器1030之间通过内部连接通路互相通信。该存储器1030用于存储指令，该处理器1010用于执行该存储器1030存储的指令，以控制该收发器1020接收信号或发送信号。其中，该收发器1020用于：
基于第一TTI向第一终端设备发送控制信道，所述控制信道包括特定比特位，所述特定比特位用于指示所述第二终端设备用于发送数据信道的时域长度为第二TTI的长度，所述第二TTI的长度小于所述第一TTI的长度；基于所述第二TTI向所述第一终端设备发送所述数据信道，以便于所述第一终端设备根据所述特定比特位上的值，确定所述第二终端设备用于发送数据信道的时域长度为所述第二TTI的长度，并基于所述第二TTI侦听所述第二终端设备发送的所述数据信道。
因此，第二终端设备通过设置待发送的控制信道的特定比特位来指示该控制信道对应的数据信道的资源占用情况，从而使检测到该控制信道的第一终端设备能够根据该特定比特位有效地进行资源侦听。
可选地，所述处理器1010用于：确定用于发送所述数据信道的时域长度为所述第二TTI的长度；根据所述第二TTI的长度，将所述特定比特位上的值设置为与所述第二TTI的长度对应的值。
可选地，所述第一TTI包括多个第二TTI，若所述特定比特位上的值表示所述时域长度等于所述第二TTI的长度，所述多个比特位上的值还表示所述第二终端设备用于发送数据信道的所述第二TTI在所述多个第二TTI中的相对位置。
可选地，所述多个第二TTI的长度相同或者不同。
可选地，所述第二TTI的长度等于一个时隙。
可选地，所述控制信道承载侧行链路控制信息SCI，所述特定比特位为所述SCI中包括的预留比特位。
可选地，所述第一终端设备支持版本Release-15的通信协议，所述第二终端设备支持版本Release-14的通信协议且不支持版本Release-15的通信协议，所述特定比特位上的值表示所述时域长度为所述第一TTI的长度；或者所述第一终端设备支持版本Release-15的通信协议，所述第二终端设备支持版本Release-15的通信协议，所述特定比特位上的值表示所述时域长度为所述第一TTI的长度或者所述第二TTI的长度。
应理解，在本申请实施例中，该处理器1010可以是中央处理单元(Central Processing Unit，CPU)，该处理器1010还可以是其他通用处理器、数字信号处理器(DSP)、专用集成电路(ASIC)、现成可编程门阵列(FPGA)或者其他可编程逻辑器件、分立门或者晶体管逻辑器件、分立硬件组件等。通 用处理器可以是微处理器或者该处理器也可以是任何常规的处理器等。
该存储器1030可以包括只读存储器和随机存取存储器，并向处理器1010提供指令和数据。存储器1030的一部分还可以包括非易失性随机存取存储器。在实现过程中，上述方法的各步骤可以通过处理器1010中的硬件的集成逻辑电路或者软件形式的指令完成。结合本申请实施例所公开的定位方法的步骤可以直接体现为硬件处理器执行完成，或者用处理器1010中的硬件及软件模块组合执行完成。软件模块可以位于随机存储器，闪存、只读存储器，可编程只读存储器或者电可擦写可编程存储器、寄存器等本领域成熟的存储介质中。该存储介质位于存储器1030，处理器1010读取存储器1030中的信息，结合其硬件完成上述方法的步骤。为避免重复，这里不再详细描述。
根据本申请实施例的终端设备1000可以对应于上述方法600中用于执行方法600的第二设备，以及根据本申请实施例的终端设备800，且该终端设备1000中的各单元或模块分别用于执行上述方法600中第二终端设备所执行的各动作或处理过程，这里，为了避免赘述，省略其详细说明。
图11是本申请实施例的系统芯片的一个示意性结构图。图11的系统芯片1100包括输入接口1101、输出接口1102、至少一个处理器1103、存储器1104，所述输入接口1101、输出接口1102、所述处理器1103以及存储器1104之间通过内部连接通路互相连接。所述处理器1103用于执行所述存储器1104中的代码。
可选地，当所述代码被执行时，所述处理器1103可以实现方法实施例中由终端设备执行的方法400。为了简洁，这里不再赘述。
可选地，当所述代码被执行时，所述处理器1103可以实现方法实施例中由网络设备执行的方法600。为了简洁，这里不再赘述。
本领域普通技术人员可以意识到，结合本文中所公开的实施例描述的各示例的单元及算法步骤，能够以电子硬件、或者计算机软件和电子硬件的结合来实现。这些功能究竟以硬件还是软件方式来执行，取决于技术方案的特定应用和设计约束条件。专业技术人员可以对每个特定的应用来使用不同方法来实现所描述的功能，但是这种实现不应认为超出本申请的范围。
所属领域的技术人员可以清楚地了解到，为描述的方便和简洁，上述描述的系统、装置和单元的具体工作过程，可以参考前述方法实施例中的对应 过程，在此不再赘述。
在本申请所提供的几个实施例中，应该理解到，所揭露的系统、装置和方法，可以通过其它的方式实现。例如，以上所描述的装置实施例仅仅是示意性的，例如，该单元的划分，仅仅为一种逻辑功能划分，实际实现时可以有另外的划分方式，例如多个单元或组件可以结合或者可以集成到另一个系统，或一些特征可以忽略，或不执行。另一点，所显示或讨论的相互之间的耦合或直接耦合或通信连接可以是通过一些接口，装置或单元的间接耦合或通信连接，可以是电性，机械或其它的形式。
该作为分离部件说明的单元可以是或者也可以不是物理上分开的，作为单元显示的部件可以是或者也可以不是物理单元，即可以位于一个地方，或者也可以分布到多个网络单元上。可以根据实际的需要选择其中的部分或者全部单元来实现本实施例方案的目的。
另外，在本申请各个实施例中的各功能单元可以集成在一个监测单元中，也可以是各个单元单独物理存在，也可以两个或两个以上单元集成在一个单元中。
该功能如果以软件功能单元的形式实现并作为独立的产品销售或使用时，可以存储在一个计算机可读取存储介质中。基于这样的理解，本申请的技术方案本质上或者说对现有技术做出贡献的部分或者该技术方案的部分可以以软件产品的形式体现出来，该计算机软件产品存储在一个存储介质中，包括若干指令用以使得一台计算机设备(可以是个人计算机，服务器，或者网络设备等)执行本申请各个实施例所述方法的全部或部分步骤。而前述的存储介质包括：U盘、移动硬盘、只读存储器(Read-Only Memory，ROM)、随机存取存储器(Random Access Memory，RAM)、磁碟或者光盘等各种可以存储程序代码的介质。
以上，仅为本申请的具体实施方式，但本申请实施例的保护范围并不局限于此，任何熟悉本技术领域的技术人员在本申请实施例揭露的技术范围内，可轻易想到变化或替换，都应涵盖在本申请适合私利的保护范围之内。因此，本申请实施例的保护范围应该以权利要求的保护范围为准。

Claims (26)

  1. 一种设备对设备D2D通信的方法，其特征在于，所述方法包括：
    第一终端设备在第一传输时间间隔TTI上接收第二终端设备发送的控制信道，所述控制信道包括特定比特位，所述特定比特位用于指示所述第二终端设备用于发送数据信道的时域长度；
    若所述特定比特位上的值表示所述时域长度等于所述第一TTI的长度，所述第一终端设备基于所述第一TTI，侦听所述第二终端设备发送的数据信道；
    若所述特定比特位上的值表示所述时域长度等于所述第二TTI的长度，所述第一终端设备基于所述第二TTI，侦听所述第二终端设备发送的所述数据信道，所述第二TTI的长度小于所述第一TTI的长度。
  2. 根据权利要求1所述的方法，其特征在于，所述第一TTI包括多个第二TTI，若所述特定比特位上的值表示所述时域长度等于所述第二TTI的长度，所述多个特定比特位上的值还表示所述第二终端设备用于发送数据信道的所述第二TTI在所述多个第二TTI中的相对位置。
  3. 根据权利要求2所述的方法，其特征在于，所述多个第二TTI的长度相同或者不同。
  4. 根据权利要求1至3中任一项所述的方法，其特征在于，所述第二TTI的长度等于一个时隙。
  5. 根据权利要求1至4中任一项所述的方法，其特征在于，所述控制信道承载侧行链路控制信息SCI，所述特定比特位为所述SCI中包括的预留比特位。
  6. 根据权利要求1至5中任一项所述的方法，其特征在于，所述第一终端设备支持版本Release-15的通信协议，所述第二终端设备支持版本Release-14的通信协议且不支持版本Release-15的通信协议，所述特定比特位上的值表示所述时域长度为所述第一TTI的长度；
    或者所述第一终端设备支持版本Release-15的通信协议，所述第二终端设备支持版本Release-15的通信协议，所述特定比特位上的值表示所述时域长度为所述第一TTI的长度或者所述第二TTI的长度。
  7. 一种设备对设备D2D通信的方法，其特征在于，所述方法包括：
    第二终端设备基于第一TTI向第一终端设备发送控制信道，所述控制信 道包括特定比特位，所述特定比特位用于指示所述第二终端设备用于发送数据信道的时域长度为第二TTI的长度，所述第二TTI的长度小于所述第一TTI的长度；
    所述第二终端设备基于所述第二TTI向所述第一终端设备发送所述数据信道，以便于所述第一终端设备根据所述特定比特位上的值，确定所述第二终端设备用于发送数据信道的时域长度为所述第二TTI的长度，并基于所述第二TTI侦听所述第二终端设备发送的所述数据信道。
  8. 根据权利要求7所述的方法，其特征在于，所述方法还包括：
    所述第二终端设备确定用于发送所述数据信道的时域长度为所述第二TTI的长度；
    所述第二终端设备根据所述第二TTI的长度，将所述特定比特位上的值设置为与所述第二TTI的长度对应的值。
  9. 根据权利要求7或8所述的方法，其特征在于，所述第一TTI包括多个第二TTI，若所述特定比特位上的值表示所述时域长度等于所述第二TTI的长度，所述多个特定比特位上的值还表示所述第二终端设备用于发送数据信道的所述第二TTI在所述多个第二TTI中的相对位置。
  10. 根据权利要求9所述的方法，其特征在于，所述多个第二TTI的长度相同或者不同。
  11. 根据权利要求7至10中任一项所述的方法，其特征在于，所述第二TTI的长度等于一个时隙。
  12. 根据权利要求7至11中任一项所述的方法，其特征在于，所述控制信道承载侧行链路控制信息SCI，所述特定比特位为所述SCI中包括的预留比特位。
  13. 根据权利要求7至12中任一项所述的方法，其特征在于，所述第一终端设备支持版本Release-15的通信协议，所述第二终端设备支持版本Release-14的通信协议且不支持版本Release-15的通信协议，所述特定比特位上的值表示所述时域长度为所述第一TTI的长度；
    或者所述第一终端设备支持版本Release-15的通信协议，所述第二终端设备支持版本Release-15的通信协议，所述特定比特位上的值表示所述时域长度为所述第一TTI的长度或者所述第二TTI的长度。
  14. 一种终端设备，其特征在于，所述终端设备为第一终端设备，所述 第一终端设备包括：
    收发单元，用于在第一传输时间间隔TTI上接收第二终端设备发送的控制信道，所述控制信道包括特定比特位，所述特定比特位用于指示所述第二终端设备用于发送数据信道的时域长度；
    侦听单元，用于若所述特定比特位上的值表示所述时域长度等于所述第一TTI的长度，所述第一终端设备基于所述第一TTI，侦听所述第二终端设备发送的数据信道；
    所述侦听单元还用于，若所述特定比特位上的值表示所述时域长度等于所述第二TTI的长度，所述第一终端设备基于所述第二TTI，侦听所述第二终端设备发送的所述数据信道，所述第二TTI的长度小于所述第一TTI的长度。
  15. 根据权利要求14所述的终端设备，其特征在于，所述第一TTI包括多个第二TTI，若所述特定比特位上的值表示所述时域长度等于所述第二TTI的长度，所述多个比特位上的值还表示所述第二终端设备用于发送数据信道的所述第二TTI在所述多个第二TTI中的相对位置。
  16. 根据权利要求15所述的终端设备，其特征在于，所述多个第二TTI的长度相同或者不同。
  17. 根据权利要求14至16中任一项所述的终端设备，其特征在于，所述第二TTI的长度等于一个时隙。
  18. 根据权利要求14至17中任一项所述的终端设备，其特征在于，所述控制信道承载侧行链路控制信息SCI，所述特定比特为为所述SCI中包括的预留比特位。
  19. 根据权利要求14至18中任一项所述的终端设备，其特征在于，所述第一终端设备支持版本Release-15的通信协议，所述第二终端设备支持版本Release-14的通信协议且不支持版本Release-15的通信协议，所述特定比特位上的值表示所述时域长度为所述第一TTI的长度；
    或者所述第一终端设备支持版本Release-15的通信协议，所述第二终端设备支持版本Release-15的通信协议，所述特定比特位上的值表示所述时域长度为所述第一TTI的长度或者所述第二TTI的长度。
  20. 一种终端设备，其特征在于，所述终端设备为第二终端设备，所述第二终端设备包括：
    收发单元，用于基于第一TTI向第一终端设备发送控制信道，所述控制信道包括特定比特位，所述特定比特位用于指示所述第二终端设备用于发送数据信道的时域长度为第二TTI的长度，所述第二TTI的长度小于所述第一TTI的长度；
    所述收发单元还用于，基于所述第二TTI向所述第一终端设备发送所述数据信道，以便于所述第一终端设备根据所述特定比特位上的值，确定所述第二终端设备用于发送数据信道的时域长度为所述第二TTI的长度，并基于所述第二TTI侦听所述第二终端设备发送的所述数据信道。
  21. 根据权利要求20所述的终端设备，其特征在于，所述终端设备还包括：
    确定单元，用于确定用于发送所述数据信道的时域长度为所述第二TTI的长度；
    处理单元，用于根据所述第二TTI的长度，将所述特定比特位上的值设置为与所述第二TTI的长度对应的值。
  22. 根据权利要求20或21所述的终端设备，其特征在于，所述第一TTI包括多个第二TTI，若所述特定比特位上的值表示所述时域长度等于所述第二TTI的长度，所述多个比特位上的值还表示所述第二终端设备用于发送数据信道的所述第二TTI在所述多个第二TTI中的相对位置。
  23. 根据权利要求22所述的终端设备，其特征在于，所述多个第二TTI的长度相同或者不同。
  24. 根据权利要求20至23中任一项所述的终端设备，其特征在于，所述第二TTI的长度等于一个时隙。
  25. 根据权利要求20至24中任一项所述的终端设备，其特征在于，所述控制信道承载侧行链路控制信息SCI，所述特定比特位为所述SCI中包括的预留比特位。
  26. 根据权利要求20至25中任一项所述的终端设备，其特征在于，所述第一终端设备支持版本Release-15的通信协议，所述第二终端设备支持版本Release-14的通信协议且不支持版本Release-15的通信协议，所述特定比特位上的值表示所述时域长度为所述第一TTI的长度；
    或者所述第一终端设备支持版本Release-15的通信协议，所述第二终端设备支持版本Release-15的通信协议，所述特定比特位上的值表示所述时域 长度为所述第一TTI的长度或者所述第二TTI的长度。
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