WO2013159596A1 - 一种用户设备到用户设备的通信方法及用户设备 - Google Patents

一种用户设备到用户设备的通信方法及用户设备 Download PDF

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Publication number
WO2013159596A1
WO2013159596A1 PCT/CN2013/072113 CN2013072113W WO2013159596A1 WO 2013159596 A1 WO2013159596 A1 WO 2013159596A1 CN 2013072113 W CN2013072113 W CN 2013072113W WO 2013159596 A1 WO2013159596 A1 WO 2013159596A1
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Prior art keywords
signal
timing
receiving device
signal receiving
receiving
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PCT/CN2013/072113
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English (en)
French (fr)
Inventor
周晗
冯淑兰
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华为技术有限公司
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Publication of WO2013159596A1 publication Critical patent/WO2013159596A1/zh

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W56/00—Synchronisation arrangements
    • H04W56/001—Synchronization between nodes
    • H04W56/002—Mutual synchronization

Definitions

  • the present invention belongs to the field of wireless communication technologies, and in particular, to a communication method and user equipment of a user equipment to a user equipment. Background technique
  • the cellular network is the main wireless communication network.
  • this communication network two terminal communication needs to be forwarded by the base station, and the same data packet from the terminal to the base station, and then from the base station to the terminal, will occupy the air interface twice. If the two communication terminals are far away and cannot reach each other, the existing wireless communication network is feasible; however, if the communication parties are close to each other and communicate with the existing wireless communication network, resources are wasted.
  • the base station For the case where the two parties are close to each other and the communication parties are within the communication range of the other party, if the data packet is directly transmitted between the two terminals, it does not need to be forwarded by the base station, which can save Half of the resources.
  • Such direct communication between the terminal and the terminal - Device to Device enables direct communication between the terminal devices without any intermediate infrastructure. Therefore, the direct communication of the terminal device can utilize the spectrum resources more efficiently, increase the capacity of the cellular network, and reduce the overhead of the base station control signaling, which is a technology that can bring great benefits to the cellular network communication.
  • D2D communication when a plurality of D2D transmitting user equipments UE simultaneously transmit signals to one D2D receiving UE, if multiple D2D transmitting UEs transmit signals at respective timings, the D2D receiving multiple signal arrival times that the UE may receive The difference is very large, which will cause great intersymbol interference and inter-carrier interference. Therefore, multiple D2D transmission signals required by the UE are required to arrive at the D2D receiving UE at the same time.
  • TA timing advance
  • the timing of the eNB that is, the eNB simultaneously transmits data to the UE and receives data of the UE at the time of 7 ⁇ .
  • the eNB receives it at the moment of 7 ⁇ .
  • the UE is received at the moment.
  • the eNB configures each UE with a time advancement TA of one uplink subframe and a downlink subframe.
  • implementing this technique requires a large amount of signaling interaction and increases overhead.
  • the embodiment of the present invention provides a communication method of a user equipment to a user equipment and a user equipment, which are related to the problem that the signal transmitted by multiple D2D transmitting UEs cannot reach the D2D receiving UE at the same time.
  • a method for communicating a user equipment to a user equipment includes: receiving, by a signal sending device, a cellular timing signal sent by a base station, and determining a timing of the base station according to the cellular timing signal;
  • the signaling device After the device discovers the subframe, the signaling device receives the device discovery signal sent by the signal receiving device, and records the arrival time of the device discovery signal;
  • the signal transmitting device transmits the D2D data signal to the signal receiving device at the timing.
  • a user equipment where the user equipment includes:
  • a timing position determining unit configured to receive a cellular timing signal sent by the base station, and determine a timing of the base station according to the cellular timing signal
  • the arrival time determining unit is configured to: in the device discovery subframe, receive the device discovery signal sent by the signal receiving device, and record the arrival time of the device discovery signal;
  • Transmission timing determining unit calculates a transmission signal receiving apparatus to the user equipment to the user equipment in time D2D data signal r s;
  • each signal sending device sends D2D data at the calculated time.
  • the signals are sent to the same signal receiving device, and the signal receiving device can receive the D2D data signals sent by the respective signal transmitting devices at the same time, thereby realizing synchronization of the plurality of signal transmitting devices.
  • FIG. 1 is a schematic diagram of relationship between eNB timing and UE timing when the TA technology is used in the LTE system provided by the prior art;
  • FIG. 2 is a flow chart showing an implementation of a communication method between a user equipment and a user equipment according to Embodiment 1 of the present invention
  • FIG. 3 is a schematic structural diagram of a wireless communication system according to Embodiment 1 of the present invention.
  • FIG. 4 is a flowchart of implementing a communication method between a user equipment and a user equipment according to Embodiment 2 of the present invention
  • Figure 5 is a schematic diagram showing the relationship between 7 ⁇ , ⁇ ;, ⁇ 2 , ⁇ ⁇ and the second embodiment of the present invention
  • FIG. 6 is a flowchart of implementing a communication method between a user equipment and a user equipment according to Embodiment 3 of the present invention.
  • FIG. 7 is a schematic diagram showing the relationship between 7 ⁇ , ⁇ ;, ⁇ 2 , ⁇ ⁇ 3 , and between the third embodiment of the present invention
  • FIG. 8 is a flowchart of implementing a communication method of a user equipment to a user equipment according to Embodiment 4 of the present invention.
  • FIG. 9 is a schematic diagram showing the relationship between 7 ⁇ , ⁇ ;, ⁇ 2 , ⁇ ⁇ ⁇ and the embodiment provided by the fourth embodiment of the present invention.
  • FIG. 11 is a schematic diagram showing relationships between 7 ⁇ , ⁇ ;, c 2 , G, c 3 , c s , and according to Embodiment 5 of the present invention;
  • FIG. 12 is a structural block diagram of a user equipment according to Embodiment 6 of the present invention.
  • FIG. 13 is a structural block diagram of a user equipment according to Embodiment 7 of the present invention.
  • FIG. 14 is a structural block diagram of a user equipment according to Embodiment 8 of the present invention.
  • FIG. 15 is a structural block diagram of a user equipment according to Embodiment 9 of the present invention.
  • FIG. 16 is a structural block diagram of a user equipment according to Embodiment 10 of the present invention. detailed description
  • association relationship describing an association object, indicating that there may be three relationships, for example, A and/or B, which may indicate that: A exists separately, and A and B exist simultaneously. There are three cases of B alone.
  • the character "/" in this article generally indicates that the contextual object is an "or" relationship.
  • the signal sending device receives the cellular timing signal sent by the base station, and determines the timing of the base station according to the cellular timing signal; '; in the device discovery subframe, the signal sending device receives the device discovery sent by the signal receiving device. signal, and records the arrival time of the device discovery signal; the signal transmitting apparatus according to the timing 7 ⁇ then the arrival time, the base station ', D2D calculates a transmission data signal to the signal reception apparatus time ⁇ 5, each of the transmitted signals The device is at the moment ⁇ 5 directions The same signal receiving device transmits the D2D data signal, and the plurality of D2D data signals can reach the signal receiving device at the same time, thereby realizing synchronization of the plurality of signal transmitting devices.
  • Embodiment 1 Embodiment 1
  • FIG. 2 is a flowchart of a method for implementing a communication method from a user equipment to a user equipment according to Embodiment 1 of the present invention.
  • the user equipment is divided into a signal sending device and a signal receiving device, which are as follows:
  • step S201 the signal sending device receives the cell timing signal sent by the base station, and determines the timing T of the base station according to the cell timing signal.
  • the wireless communication system includes a user equipment base station eNB,
  • the base station eNB may send a cell timing signal to UE1, UE2, and UE3 respectively.
  • UE3 may send a device to UE1 and UE2.
  • the discovery signal after the UE1 and the UE2 determine the time at which the D2D data signal is sent to the UE3 according to the device discovery signal, the D2D data signal can be simultaneously sent to the UE3 at the moment.
  • the UE3 After receiving the downlink cellular timing signal sent by the base station, the UE3 determines that the time when the downlink cellular timing signal is received is the downlink timing 7 of the cellular communication, and determines the cellular communication according to the value of the value included in the downlink cellular timing signal.
  • the timing of the uplink timing W TA and the base station ⁇ ⁇ ⁇ - ⁇ 1.
  • the UEi and the UE2 After receiving the downlink cellular timing signal sent by the base station, the UEi and the UE2 determine that the time at which the downlink cellular timing signal is received is the downlink timing of the cellular communication, and determine the uplink of the cellular communication according to the value of the value included in the downlink cellular timing signal. Timing and timing of the base station'.
  • step S202 when the device discovers a subframe, the signal transmitting device receives the signal receiving device and sends the signal. The device discovers the signal and records the arrival time of the device discovery signal.
  • the timing of the signal receiving apparatus 7 can be the uplink signal receiving apparatus ⁇ discovery signal transmitting apparatus, the transmitting device may be a timing signal receiving apparatus in a downlink discovery signals.
  • the signal transmitting device may receive the device discovery signal sent by the signal receiving device at the uplink timing of the signal transmitting device, or may receive the device discovery signal sent by the signal receiving device at the downlink timing of the signal transmitting device.
  • a signal transmission apparatus is a timing receiving device discovery signal in an uplink signal transmitting apparatus and signal receiving apparatus is the timing of receiving an uplink signal receiving apparatus
  • the D2D data signal the device discovery signal carries the receiving timing information of the signal receiving device, the receiving timing information includes a value of 73 ⁇ 4; when the signal receiving device is at the downlink timing T3 of the signal receiving device, the device discovery signal is sent, and the signal is sent.
  • the device is configured to receive the device discovery signal at the downlink timing of the signal sending device, and the signal receiving device receives the D2D data signal at the downlink timing of the signal receiving device, where the device discovery signal carries the receiving timing information of the signal receiving device, and the receiving The timing information includes a value of 73 ⁇ 4; when the signal receiving device is transmitting the device discovery signal at the uplink timing of the signal receiving device, the signal receiving device is receiving the device discovery signal at the uplink timing of the signal receiving device, and the signal receiving device is at the signal receiving device Downlink timing When D2D data signal, the device discovery signal does not include the reception timing information, i.e., does not contain
  • the signal transmitting device when the signal receiving device is transmitting the device discovery signal at the signal receiving device, the signal transmitting device is receiving the device discovery signal at the receiving timing set by the signal transmitting device, and the signal receiving device is receiving at the signal receiving device setting
  • the signal transmitting apparatus according to the arrival time and the timing of the base station 7 ⁇ ', calculates a transmission signal receiving apparatus to the user equipment to the user equipment in time D2D data signal ⁇ 5.
  • each signal transmission apparatus is a timing receiving device discovery signal in an uplink signal transmitting apparatus and signal receiving apparatus that receives a signal
  • the uplink timing of the device receives the D2D data signal sent by the signal transmitting device
  • the signal sending device parses the device discovery signal to obtain the receiving timing information carried in the device discovery signal
  • f 2 T[-TAI2 ⁇ is calculated to be sent to the signal receiving device according to the arrival time and the uplink timing
  • the signal transmitting device receives the device discovery signal at the downlink timing of the signal transmitting device, and the signal receiving device receives the D2D data signal at the downlink timing of the signal receiving device.
  • the signal sending device parses the device discovery signal to obtain the receiving timing information carried in the device discovery signal
  • the signal transmitting device receives the device discovery signal at the uplink timing of the signal transmitting device, and the signal receiving device receives the D2D data signal at the downlink timing of the signal receiving device.
  • the signal sending device calculates the downlink timing 7 ⁇ of the signal receiving device and the uplink timing of the signal receiving device according to the timing 7 of the base station, and the specific calculation formula is:
  • the signal receiving device transmits the device discovery signal at the transmission timing of the signal receiving device
  • the signal transmitting device receives the device discovery signal at the receiving timing set by the signal transmitting device
  • the signal receiving device receives the D2D at the receiving timing set by the signal receiving device.
  • the signal sending device parses the device discovery signal to obtain the receiving timing information carried in the device discovery signal
  • the timing of the base station ⁇ ; ⁇ 7 value and the reception timing information, the signal reception apparatus calculates the reception timing of row C 3 and the timing of the transmission signal receiving apparatus C 2.
  • the specific calculation formula is:
  • the timing of the base station determined by the signal receiving device is a timing of the base station determined by the signal transmitting device, is a transmission timing of the signal receiving device, and is a receiving timing of the signal receiving device;
  • step S204 the signal transmitting device transmits the D2D data signal to the signal receiving device at the timing.
  • the multiple signal sending devices receive the cellular timing signal sent by the base station, and determine the timing of the base station according to the cellular timing signal.
  • the device discovery subframe multiple signal sending devices respectively receive the device sent by the same signal receiving device. discovery signal, and records the arrival time of the device discovery signal; transmitting the respective signals, respectively, according to the timing device 7 ⁇ then the arrival time, the base station ', the same time to calculate the signal receiving device transmits D2D data signals, each signal Sending device
  • the D2D data signal is not sent to the same signal receiving device at the time, and the signal receiving device can be simultaneously reached, thereby realizing synchronization of the plurality of signal transmitting devices.
  • FIG. 4 is a flowchart of an implementation process of a user equipment to a user equipment according to Embodiment 2 of the present invention.
  • the user equipment is divided into a signal sending device and a signal receiving device, and each signal receiving device is configured by The uplink receiving device of the signal receiving device transmits a device discovery signal, and each signal is sent.
  • the device receives the device discovery signal sent by the other user equipment by using the uplink timing of the signaling device, where the sending signal carries the receiving timing information, and each signal sending device according to the arrival time of the device discovery signal sent by the signal receiving device; said arrival time, the timing of the base station 7 ⁇ 'and the reception timing information, to calculate the time signal receiving device transmits the same data signal D2D to ensure D2D data signal transmission apparatus transmits different signals arrive simultaneously at the same signal receiving apparatus
  • the signal receiving device receives the D2D data signal sent by the signal transmitting device at its own uplink timing position. This embodiment is particularly applicable to a scenario in which a D2D communication shares a cellular FDD uplink frequency and a shared cellular TDD frequency, as follows:
  • step 1 the signal receiving device receives the cellular timing signal sent by the base station, and determines the downlink timing r 3 , the uplink timing r 2 of the signal receiving device, and the timing of the base station according to the cellular timing signal.
  • step 2 the plurality of signal transmitting devices receive the cellular timing signal transmitted by the base station, and determine the downlink timing, the uplink timing, and the timing of the base station 7 of the signal transmitting device according to the cellular timing signal.
  • steps 1 and 2 have no prioritization and can be executed serially or in parallel.
  • step 3 in the device discovery subframe, the signal receiving device sends a device discovery signal with the uplink timing ⁇ 2 of the signal receiving device, where the device discovery signal carries the receiving timing information of the signal receiving device, and the receiving timing information includes 73 ⁇ 4 value.
  • step 4 in the device discovery subframe, the plurality of signal transmitting devices receive the device discovery signal sent by the same signal receiving device at the uplink timing of the signaling device, and record the arrival time of the device discovery signal.
  • each signal sending device parses the device discovery signal to obtain receiving timing information carried in the device discovery signal.
  • the reception timing information includes a value of a signal receiving device.
  • the respective signals are transmitted according to the timing device 7 ⁇ 'and 73 ⁇ 4 value of the reception timing information of the base station calculates the uplink timing of the signal receiving apparatus.
  • each signal transmitting device calculates a time at which the D2D data signal is transmitted to the same signal receiving device based on the arrival time and the uplink timing 7 ⁇ , respectively.
  • FIG. 5 the relationship between 7 ⁇ , ⁇ ; , ⁇ 2 , ⁇ ⁇ , and 7 ⁇ in this embodiment is shown in FIG. 5 , wherein the signal transmitting device is represented by D2D — UE — ,, and the signal receiving device uses D2D — UE — Rx said.
  • ⁇ 2 is an uplink timing of the signal receiving device calculated by the signal transmitting device according to the threshold value carried in the device discovery signal sent by the signal receiving device. The relationship between these two values is similar to the relationship of 7 ⁇ , and the absolute time is the same, but the values are different. It is the downlink timing of the signal receiving device.
  • the signal receiving device transmits the device discovery signal with its uplink timing
  • the time at which the device discovery signal arrives at the signal transmitting device is, and the transmission delay between the signal receiving device and the signal transmitting device is such that when the signal transmitting device receives the signal
  • each of the signal transmitting devices transmits the D2D data signal to the same signal receiving device at the timing.
  • FIG. 6 is a flowchart of a method for implementing a communication method of a user equipment to a user equipment according to Embodiment 3 of the present invention.
  • the user equipment is divided into a signal sending device and a signal receiving device, and each signal receiving device is configured by The downlink receiving device of the signal receiving device sends a device discovery signal, and each signal transmitting device receives the device discovery signal sent by the other user equipment by using the downlink timing of the signaling device, where the device sending signal carries the receiving timing information, and each signal sending device is configured according to device discovery signal receiving apparatus transmits arrival time signal; re 'and the reception timing based on the timing information 7 ⁇ the arrival time, the base station calculates the transmission time of the same signal receiving apparatus D2D data signal to ensure that the different The D2D data signal sent by the signal transmitting device arrives at the signal receiving device at the downlink timing position of the signal receiving device, and the signal receiving device can receive the D2D data signal sent by all the signal transmitting devices at its own downlink timing
  • step 11 the signal receiving device receives the cellular timing signal sent by the base station, and determines its own downlink timing ⁇ 3 , uplink timing ⁇ 2 and the timing of the base station according to the cellular timing signal.
  • the plurality of signal transmitting devices receive the cellular timing signal sent by the base station, and determine the downlink timing, the uplink timing, and the timing of the base station of the signal transmitting device according to the cellular timing signal. T;.
  • steps 11 and 12 are not sequential, and may be executed serially or in parallel.
  • the signal receiving device sends a device discovery signal with a downlink timing 7 ⁇ of the signal receiving device, where the device discovery signal carries the receiving timing information of the signal receiving device, where the receiving timing information includes 73 ⁇ 4 value.
  • the plurality of signal transmitting devices receive the device discovery signal sent by the same signal receiving device at the timing of the signaling device, and record the arrival time of the device discovery signal.
  • each signal sending device parses the device discovery signal to obtain receiving timing information carried in the device discovery signal.
  • the receiving timing information includes a value of a signal receiving device.
  • each signal transmitting device calculates a downlink timing 7 3 of the signal receiving device according to the timing of the base station 7 ⁇ ' and the value of the receiving timing information.
  • step 17 the respective signal transmitting apparatus according to the arrival time of the downlink timing and ⁇ 3, the calculated time to the same signal receiving apparatus transmits a data signal D2D.
  • Step 18 Each signal transmitting device sends the D2D data signal to the same signal receiving device at the moment.
  • the steps 15, 16, and 17 are included in the step S103 of the first embodiment, and details are not described herein again.
  • 7 i, r ; , T , ⁇ ⁇ 3 , and the relationship between them are shown in FIG. 7 , wherein the signal transmitting device is represented by D2D — UE — ,, and the signal receiving device uses D2D — UE — Rx. Said.
  • FIG. 8 is a flowchart of a method for implementing a communication method of a user equipment to a user equipment according to Embodiment 4 of the present invention.
  • the user equipment is divided into a signal sending device and a signal receiving device, and each signal receiving device is configured by The uplink receiving device of the signal receiving device sends a device discovery signal, and each signal transmitting device receives the device discovery signal sent by the other user equipment by using the uplink timing of the signaling device, and each signal sending device according to the arrival time of the device discovery signal sent by the signal receiving device ; 7 ⁇ then according to the timing of the arrival time and the base station 'calculates ⁇ 5 the same time to the signal receiving apparatus D2D data transmission signal to ensure D2D data signal transmitted by the signal transmitting apparatus different timings in a downlink signal receiving apparatus
  • the location arrives at the signal receiving device at the same time, and the signal receiving device can receive the D2D data signal transmitted by all the signal transmitting devices at its own downlink timing position.
  • This embodiment is particularly
  • the signal receiving device receives the cellular timing signal sent by the base station, and determines the downlink timing ⁇ 3 of the signal receiving device, the uplink timing ⁇ 2, and the timing of the base station according to the cellular timing signal.
  • the plurality of signal transmitting devices receive the cellular timing signal transmitted by the base station, and determine the downlink timing, the uplink timing, and the timing ⁇ of the base station according to the cellular timing signal.
  • steps 21 and 22 have no prioritization and can be executed serially. Execute in parallel.
  • step 23 in the device discovery subframe, the signal receiving device sends a device discovery signal at its own uplink timing ⁇ 2 , where the device discovery signal does not carry the receiving timing information of the signal receiving device, that is, the device discovery signal. Does not include a value of 73 ⁇ 4.
  • the plurality of signal transmitting devices receive the device discovery signal sent by the signal receiving device at their own uplink timing, and record the arrival time ⁇ of the device discovery signal.
  • step 25 the respective signal transmitting apparatus 7 ⁇ ', calculates the downlink timing and the timing of the uplink signal receiving apparatus according to the timing of a signal receiving apparatus of the base station.
  • each signal transmitting device calculates a time at which the D2D data signal is transmitted to the same signal receiving device based on the arrival time and the downlink timing and the uplink timing.
  • each signal transmitting device transmits a D2D data signal to the same signal receiving device at said time r s .
  • Steps 25 and 26 are included in step S103 of the first embodiment, and details are not described herein again.
  • the relationship between 7 ⁇ , ⁇ ; , ⁇ 2 , , ⁇ ⁇ , and 7 ⁇ in this embodiment is shown in FIG. 9 , wherein the signal transmitting device is represented by D2D — UE — ,, and the signal receiving device uses D2D — UE. — Rx representation.
  • FIG. 10 is a flowchart of a method for implementing a communication method of a user equipment to a user equipment according to Embodiment 5 of the present invention.
  • the user equipment is divided into a signal sending device and a signal receiving device, and each signal receiving device is configured by The transmitting timing of the signal receiving device sends a device discovery signal, and each signal transmitting device receives a device discovery signal sent by another user equipment at a receiving timing of the signal transmitting device, and the receiving timing information carried in the signal is transmitted by the device, and each signal transmitting device 7 ⁇ 7 ⁇ then according to the timing of the arrival time, the base station 'and the reception timing information, to calculate the time signal receiving device transmits the same data signal D2D ⁇ apparatus according to the arrival time of the discovery signal transmitted by the signal receiving apparatus 5
  • the signal receiving device can receive the D2D data signal sent by all the signal
  • step 31 the cellular signal receiving apparatus receives the timing signal transmitted from the base station, according to the cellular signal receiving apparatus determines the timing signal reception timing C 3, C 2 and the transmission timing of the timing of the base station.
  • the plurality of signal transmitting devices receive the cellular timing signal transmitted by the base station, and determine the downlink timing, the uplink timing, and the timing ⁇ of the base station according to the cellular timing signal.
  • steps 31 and 32 have no order, and may be executed serially or in parallel.
  • the signal receiving device sends a device discovery signal with a transmission timing ⁇ 2 of the signal receiving device, where the device discovery signal carries the receiving timing information of the signal receiving device, where the receiving timing information includes ⁇ 7 value.
  • Ar C 2 + C 3 - 27;.
  • the plurality of signal transmitting devices receive the device discovery signal sent by the signal receiving device at the receiving timing of the signaling device, and record the arrival time of the device discovery signal.
  • each signal sending device parses the device discovery signal to obtain receiving timing information carried in the device discovery signal.
  • the reception timing information includes a ⁇ 7 value of the signal receiving device.
  • each signal transmitting device calculates the reception line timing C 3 of the signal receiving device and the transmission timing c 2 of the signal receiving device according to the timing 7 '' of the base station and the ⁇ 7 value.
  • the specific calculation formula is:
  • the timing of the base station determined by the signal receiving device ⁇ is the timing of the base station determined by the signal transmitting device, is the transmission timing of the signal receiving device, and G is the receiving timing of the signal receiving device.
  • step 37 the respective signal transmitting apparatus according to the arrival time and the reception timing of the transmission timing of the C 3 and C 2, the calculated time to the same signal receiving apparatus transmits a data signal D2D
  • each signal transmitting device transmits a D2D data signal to the same at the time ⁇ 5 Signal receiving device.
  • the sending timing refers to: the time when the signal sending device sends the device discovery signal. It is similar to the uplink timing in the second embodiment and the downlink timing in the third embodiment. However, these two are only special cases of transmission timing, and the transmission timing in this embodiment may be other time, such as timing obtained by GPS.
  • the receiving timing refers to: the time at which the signal receiving device receives the D2D data transmitted by the other D2D signal transmitting device in the D2D data communication phase. It is similar to the uplink timing in the second embodiment and the downlink timing in the third embodiment. However, these two are only special cases of transmission timing, and the reception timing in this embodiment may be other time, such as timing obtained by GPS.
  • the steps 35, 36, and 37 are included in the step S103 of the first embodiment, and details are not described herein again.
  • the relationship between 7 ⁇ , r ;, C2 , C c 3, G, and in the present embodiment is shown in FIG. 11 , wherein the signal transmitting device is represented by D2D — UE — Tx, and the signal receiving device is used by D2D — UE. — Rx representation.
  • FIG. 12 is a block diagram showing a specific structure of a user equipment according to Embodiment 6 of the present invention. For convenience of description, only parts related to the embodiment of the present invention are shown.
  • the user equipment and the base station constitute a wireless network system, and the user equipment includes: a timing position determining unit 121, an arrival time determining unit 122, a transmitting time determining unit 123, and a signal transmitting unit 124.
  • the timing position determining unit 121 is configured to receive a cellular timing signal sent by the base station, and determine a timing of the base station according to the cellular timing signal;
  • the arrival time determining unit 122 is configured to: in the device discovery subframe, receive a device discovery signal sent by the signal receiving device, and record an arrival time of the device discovery signal;
  • a sending time determining unit 123 configured to use the arrival time 7 ⁇ and the timing of the base station 7 ⁇ ', Calculating a time ⁇ 5 signal transmitting unit 124 for transmitting the user equipment to the user equipment D2D data signal to the signal receiving device, for transmitting the D2D data signal to the signal receiving device at the timing.
  • FIG. 13 is a block diagram showing a specific structure of a user equipment according to Embodiment 7 of the present invention. For convenience of description, only parts related to the embodiment of the present invention are shown.
  • the user equipment and the base station constitute a wireless network system, and the user equipment includes: a timing position determining unit 131, an arrival time determining unit 132, a transmitting time determining unit 133, and a signal transmitting unit 134.
  • timing position determining unit 131 For the specific functions of the timing position determining unit 131, the arrival time determining unit 132, the sending time determining unit 133, and the signal transmitting unit 134, refer to the description of the sixth embodiment, and details are not described herein again.
  • the sending time determining unit 133 includes: a first receiving timing information acquiring module 1331, a first uplink timing acquiring module 1332, and a first sending time determining module 1333.
  • the first receiving timing information acquiring module 1331 is configured to: when the signal receiving device is an uplink timing of the signal receiving device, the device detecting signal, and the signal sending device is configured to receive the device discovery signal at the uplink timing of the signal sending device, and the signal The receiving device is configured to parse the device discovery signal when the D2D data signal sent by the signal sending device is received by the signal receiving device, and obtain the receiving timing information carried in the device discovery signal;
  • FIG. 14 is a block diagram showing a specific structure of a user equipment according to Embodiment 8 of the present invention. For convenience of description, only parts related to the embodiment of the present invention are shown.
  • the user equipment and the base station constitute a wireless network system, and the user equipment includes: a timing position determining unit 141, an arrival time determining unit 142, a transmitting time determining unit 143, and a signal transmitting unit 144.
  • timing position determining unit 141 For the specific functions of the timing position determining unit 141, the arrival time determining unit 142, the sending time determining unit 143, and the signal transmitting unit 144, refer to the description of Embodiment 6, and details are not described herein again.
  • the sending time determining unit 143 includes: a second receiving timing information acquiring module 1431, a first downlink timing acquiring module 1432, and a second sending time determining module 1433.
  • the second reception timing information acquisition module 1431 a signal receiving apparatus when the signal receiving apparatus in a downlink timing transmission device 7 ⁇ discovery signals
  • the signal transmitting apparatus is a timing device receives the downlink signal transmitting apparatus discovery signal
  • the signal receiving device parses the device discovery signal when receiving the D2D data signal at the downlink timing of the signal receiving device, and obtains the receiving timing information carried in the device discovery signal;
  • the first downlink timing acquisition module 1432 according to the timing 7 ⁇ 'and 73 ⁇ 4 value of the reception timing information of the base station, calculating the timing of the downlink signal receiving apparatus ⁇ 3, is calculated as:
  • FIG. 15 is a block diagram showing a specific structure of a user equipment according to Embodiment 9 of the present invention. For convenience of description, only parts related to the embodiment of the present invention are shown.
  • the user equipment and the base station constitute a wireless network system, and the user equipment includes: a timing position determining unit 151, an arrival time determining unit 152, a transmitting time determining unit 153, and a signal transmitting unit 154.
  • timing position determining unit 151 For the specific functions of the timing position determining unit 151, the arrival time determining unit 152, the sending time determining unit 153, and the signal sending unit 154, refer to the description of the sixth embodiment, and details are not described herein again.
  • the sending time determining unit 153 includes: an uplink and downlink timing acquiring module 1531 and a third sending time determining module 1532.
  • the uplink and downlink timing acquisition module 1531 is configured to: when the signal receiving device sends the device discovery signal at the uplink timing ⁇ 2 of the signal receiving device, the signal sending device receives the device discovery signal at the uplink timing of the signal sending device, and receives the signal. The device is receiving at the downlink timing of the signal receiving device
  • the third sending time determining module 1532 is configured to calculate a time ⁇ 5 for transmitting the D2D data signal to the signal receiving device according to the arrival time, the downlink timing, and the uplink timing 7 ⁇ .
  • the calculation formula is:
  • FIG. 16 is a block diagram showing a specific structure of a user equipment according to Embodiment 10 of the present invention. For convenience of description, only parts related to the embodiment of the present invention are shown.
  • the user equipment and the base station constitute a wireless network system, and the user equipment includes: a timing position determining unit 161, an arrival time determining unit 162, a transmitting time determining unit 163, and a signal transmitting unit 164.
  • timing position determining unit 161 For the specific functions of the timing position determining unit 161, the arrival time determining unit 162, the sending time determining unit 163, and the signal sending unit 164, refer to the description of the sixth embodiment, and details are not described herein again.
  • the sending time determining unit 163 includes: a third receiving timing information acquiring module 1631, a receiving and sending timing acquiring module 1632, and a fourth sending time determining module 1633.
  • the fourth receiving timing information acquiring module 1631 is configured to: when the signal receiving device sends the device discovery signal at the sending timing 2 of the signal receiving device, and the signal sending device receives the device discovery signal at the receiving timing set by the signal sending device, and The signal receiving device parses the device discovery signal when receiving the D2D data signal at the receiving timing set by the signal receiving device, and obtains the receiving timing information carried in the device discovery signal;
  • the receiving and transmitting timing acquiring module 1632 is configured to calculate, according to the timing 7 of the base station; and the ⁇ 7 value in the receiving timing information, the receiving timing of the signal receiving device: 3 and the sending of the signal receiving device Timing C 2 , the calculation formula is:

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Abstract

一种用户设备到用户设备的通信方法及用户设备，所述方法包括：信号发送设备接收基站发送的蜂窝定时信号，并根据所述蜂窝定时信号确定所述基站的定时T' 1；在设备发现子帧，信号发送设备接收信号接收设备发送的设备发现信号，并记录所述设备发现信号的到达时刻T' 4；根据所述到达时刻T' 4、所述基站的定时T' 1，计算出向信号接收设备发送用户设备到用户设备D2D数据信号的时刻T' 5；在所述时刻T' 5发送D2D数据信号至信号接收设备。本发明，信号接收设备可以在同一时刻接收到各个信号发送设备发送的D2D数据信号。

Description

一种用户设备到用户设备的通信方法及用户设备 本申请要求于 2012 年 4 月 26 日提交中国专利局、 申请号为 201210126251.5、 发明名称为"一种用户设备到用户设备的通信方法及用户设 备"的中国专利申请的优先权， 其全部内容通过引用结合在本申请中。 技术领域
本发明属于无线通信技术领域，尤其涉及一种用户设备到用户设备的通信 方法及用户设备。 背景技术
近 20年来，无线通信网络获得了巨大的发展，无线通信技术也是层出不穷。 中不可缺少的一部分。
然而， 无线频谱资源有限， 随着使用无线通信网络的人数激增以及对无线 通信网络性能的要求日益提高，频谱资源紧张的缺点已经成为限制无线通信性 能的关键所在。
目前， 蜂窝网是主要的无线通信网络， 在这种通信网络中， 两个终端通信 需要经过基站转发， 同一个数据包从终端到基站， 再从基站到终端， 会占用空 口资源两次。 如果两个通信终端距离较远， 无法到达对方， 则现有的无线通信 网络比较可行；但如果通信双方距离较近，还用现有的无线通信网络进行通信， 则会造成资源的浪费。
对于这种通信双方距离较近， 通信双方相互在对方的通信范围内的情况， 如果将数据包直接在两个终端之间进行传输， 不需要经过基站转发， 可以节省 一半的资源。
这种终端与终端之间的直接通信-用户设备到用户设备 (Device to Device, D2D)能够使终端设备之间直接通信而不需要任何中间的基础设施。 因此， 终 端设备的直接通信能够更高效率的利用频谱资源，提高蜂窝网容量， 减少基站 控制信令的开销， 是一项能给蜂窝网通信带来巨大利益的技术。
在 D2D通信中， 当多个 D2D发送用户设备 UE同时向一个 D2D接收 UE发送 信号时， 如果多个 D2D发送 UE都以各自的定时发送信号， 那么 D2D接收 UE可 能接收到的多个信号到达时间相差很大，这样就会造成很大的符号间干扰和载 波间干扰。 因此需要多个 D2D发送 UE发送的信号同时到达 D2D接收 UE。
目前， 在 LTE系统中， 多个 UE发送信号给基站 eNB时， 可以保证多个 UE 的信号同时到达 eNB, 这是釆用了 TA (定时提前）技术， 如图 1所示， 说明了 eNB定时和 UE定时的关系。 其中， 为 eNB的定时， 也就是 eNB在7 ί时刻同时 向 UE发送数据和接收 UE的数据。 为 UE的上行定时， 也就是 UE在 时刻向 eNB发送数据， eNB恰好在7 ί时刻收到。 为 UE的下行定时，也就是 eNB在7 ί时 刻向 UE发送数据， UE恰好在 时刻收到。 比 的提前量被称为 ΤΑ。 因此这 几个值满足关系7^ - = 7¾ , Τ3 -ΤΑΙ1 = Τ ΤΊ + ΤΑΙ1 = ΤΧ 。 为了使不同蜂窝 UE的 信号同时在 eNB的定时位置达到 eNB, eNB给每个 UE配置了一个上行子帧和下 行子帧的时间提前量 TA。 但实现这种技术需要大量的信令交互， 增大了开销。 而且 D2D UE很难具备 eNB强大的功能， 因此使用 TA技术来使得多个 D2D发送 UE的信号同时到达 D2D接收 UE是不太可能的。
综上所述， 现有技术无法使得多个 D2D发送 UE发送的信号同时到达 D2D 接收 UE。 发明内容
本发明实施例提供了一种用户设备到用户设备的通信方法及用户设备，旨 在解决现有技术无法使得多个 D2D发送 UE发送的信号同时到达 D2D接收 UE的问题。
一方面， 提供一种用户设备到用户设备的通信方法， 所述方法包括： 信号发送设备接收基站发送的蜂窝定时信号 ,根据所述蜂窝定时信号确定 所述基站的定时 ；
在设备发现子帧， 信号发送设备接收信号接收设备发送的设备发现信号 , 并记录所述设备发现信号的到达时刻 ；
信号发送设备根据所述到达时刻 、 所述基站的定时7 ί' , 计算出向信号接 收设备发送用户设备到用户设备 D2D数据信号的时刻 rs；
信号发送设备在所述时刻 发送 D2D数据信号至信号接收设备。
另一方面， 提供一种用户设备， 所述用户设备包括：
定时位置确定单元， 用于接收基站发送的蜂窝定时信号， 并根据所述蜂窝 定时信号确定所述基站的定时 Τ;；
到达时刻确定单元， 用于在设备发现子帧，接收信号接收设备发送的设备 发现信号， 并记录所述设备发现信号的到达时刻 ；
发送时刻确定单元， 用于根据所述到达时刻7^和所述基站的定时7 ί' , 计算 出向信号接收设备发送用户设备到用户设备 D2D数据信号的时刻 rs；
信号发送单元， 用于在所述时刻 发送 D2D数据信号至信号接收设备。 在本发明实施例中， 各个信号发送设备在计算出的时刻 发送 D2D数据 信号至同一信号接收设备，信号接收设备可以在同一时刻接收到各个信号发送 设备发送的 D2D数据信号， 实现了多个信号发送设备的同步。 附图说明
图 1是现有技术提供的 LTE系统中釆用了 TA技术时， eNB定时和 UE定 时的关系示意图；
图 2 是本发明实施例一提供的用户设备到用户设备的通信方法的实现流 程图；
图 3是本发明实施例一提供的无线通信系统的结构示意图；
图 4 是本发明实施例二提供的用户设备到用户设备的通信方法的实现流 程图；
图 5是本发明实施例二提供的7 ί、 Τ；、 τ2 , τ τ 以及 之间的关系 示意图；
图 6 是本发明实施例三提供的用户设备到用户设备的通信方法的实现流 程图；
图 7是本发明实施例三提供的7 ί、 Τ；、 τ2 , τ Γ3、 以及 之间的关系 示意图；
图 8 是本发明实施例四提供的用户设备到用户设备的通信方法的实现流 程图；
图 9是本发明实施例四提供的7 ί、 Τ；、 τ2 , Τ τ Τ 以及 之间的 关系示意图；
图 10是本发明实施例五提供的用户设备到用户设备的通信方法的实现流 程图；
图 11是本发明实施例五提供的7 ί、 τ；、 c2、 G、 c3、 cs、 以及 之间 的关系示意图；
图 12是本发明实施例六提供的用户设备的结构框图；
图 13是本发明实施例七提供的用户设备的结构框图；
图 14是本发明实施例八提供的用户设备的结构框图；
图 15是本发明实施例九提供的用户设备的结构框图；
图 16是本发明实施例十提供的用户设备的结构框图。 具体实施方式
为了使本发明实施例的目的、技术方案及优点更加清楚明白， 以下结合附 图及实施例， 对本发明进行进一步详细说明。 应当理解， 此处所描述的具体实 施例仅仅用以解释本发明， 并不用于限定本发明。
本实施例中术语"和 /或"， 仅仅是一种描述关联对象的关联关系， 表示可 以存在三种关系， 例如， A和 /或 B, 可以表示： 单独存在 A, 同时存在 A和 B, 单独存在 B这三种情况。 另外， 本文中字符 "/" , 一般表示前后关联对象 是一种 "或" 的关系。
在本发明实施例中，信号发送设备接收基站发送的蜂窝定时信号，根据所 述蜂窝定时信号确定所述基站的定时；' ; 在设备发现子帧， 信号发送设备接收 信号接收设备发送的设备发现信号， 并记录所述设备发现信号的到达时刻 ； 信号发送设备再根据所述到达时刻 、 所述基站的定时7 ί' , 计算出向信号接收 设备发送 D2D数据信号的时刻 Τ5 , 各个个信号发送设备分别在所述时刻 Τ5向 同一信号接收设备发送 D2D数据信号，多个 D2D数据信号可以同时到达所述 信号接收设备， 实现了多个信号发送设备的同步。 实施例一
图 2 示出了本发明实施例一提供的用户设备到用户设备的通信方法的实 现流程， 在本实施例中， 所述用户设备分为信号发送设备和信号接收设备， 详 述如下：
在步骤 S201中， 信号发送设备接收基站发送的蜂窝定时信号， 根据所述 蜂窝定时信号确定所述基站的定时 T;。
在本实施例中， 如图 3 所示， 无线通信系统中包括用户设备基站 eNB、
UEl , UE2和 UE3 , 其中 UE1和 UE2为信号发送设备， UE3为信号接收设备， 基站 eNB可以向 UE1、 UE2和 UE3分别发送蜂窝定时信号，在设备发现子帧， UE3可以向 UE1和 UE2发送设备发现信号， UE1和 UE2根据所述设备发现 信号确定好向 UE3发送 D2D数据信号的时刻后，可以在所述时刻同时向 UE3 发送 D2D数据信号。
其中， UE3接收到基站发送的下行蜂窝定时信号后， 确定接收到所述下 行蜂窝定时信号的时刻为蜂窝通信的下行定时7，再根据所述下行蜂窝定时信 号中包含的 7¾值确定蜂窝通信的上行定时 W TA和基站的定时 Τχ = Τ -ΤΑΙ1。 UEi和 UE2接收到基站发送的下行蜂窝定时信号后， 确定接收 到所述下行蜂窝定时信号的时刻为蜂窝通信的下行定时，再根据所述下行蜂窝 定时信号中包含的 7¾值确定蜂窝通信的上行定时和基站的定时 '。
在步骤 S202中， 在设备发现子帧， 信号发送设备接收信号接收设备发送 的设备发现信号， 并记录所述设备发现信号的到达时刻 。
在本实施例中，信号接收设备可以在信号接收设备的上行定时7 ^发送设备 发现信号， 也可以在信号接收设备的下行定时 发送设备发现信号。
信号发送设备可以在信号发送设备的上行定时接收信号接收设备发送的 设备发现信号，也可以在信号发送设备的下行定时接收信号接收设备发送的设 备发现信号。
其中， 当信号接收设备是在信号接收设备的上行定时7 ^发送设备发现信 号，信号发送设备是在信号发送设备的上行定时接收设备发现信号，且信号接 收设备是在信号接收设备的上行定时接收 D2D数据信号时， 所述设备发现信 号中携带信号接收设备的接收定时信息， 所述接收定时信息包括 7¾值； 当信 号接收设备是在信号接收设备的下行定时 T3发送设备发现信号，信号发送设备 是在信号发送设备的下行定时接收设备发现信号，且信号接收设备是在信号接 收设备的下行定时接收 D2D数据信号时， 所述设备发现信号中携带信号接收 设备的接收定时信息， 所述接收定时信息包括 7¾值； 当信号接收设备是在信 号接收设备的上行定时 ^发送设备发现信号 ,信号接收设备是在信号接收设备 的上行定时接收设备发现信号，且信号接收设备是在信号接收设备的下行定时 接收 D2D数据信号时， 所述设备发现信号中不包含接收定时信息， 即不包含
ΤΑ值； 当信号接收设备是在信号接收设备的发送定时 ^发送设备发现信号， 信号发送设备是在信号发送设备设置的接收定时接收设备发现信号 ,且信号接 收设备是在信号接收设备设置的接收定时接收 D2D数据信号时， 所述设备发 现信号中携带信号接收设备的接收定时信息， 所述接收定时信息包括 Δ7值， 其中， ΔΓ = + C3 - 27；。 在步骤 S203中，信号发送设备根据所述到达时刻 和所述基站的定时7 ί'， 计算出向信号接收设备发送用户设备到用户设备 D2D数据信号的时刻 Τ5。
在本实施例中， 当信号接收设备是在信号接收设备的上行定时7 ^发送设备 发现信号， 各个信号发送设备是在信号发送设备的上行定时接收设备发现信 号， 且信号接收设备是在信号接收设备的上行定时接收信号发送设备发送的 D2D数据信号时，
信号发送设备解析所述设备发现信号 ,获得所述设备发现信号中携带的接 收定时信息；
根据所述基站的定时7 以及所述接收定时信息中的 7¾值， 计算出所述信 号接收设备的上行定时7^ 具体的计算公式为：
f2=T[-TAI2\ 根据所述到达时刻 以及所述上行定时 ， 计算出向信号接收设备发送
D2D数据信号的时刻 ， 具体的计算公式为：
Τ5 =Τ2-{Τ4-Τ2) = (Τ; -ΤΑ/2)- [Τ4― (7 - ΤΑ 12)] = 2Γ; -ΤΑ_Τ4。
当信号接收设备是在信号接收设备的下行定时 发送设备发现信号，信号 发送设备是在信号发送设备的下行定时接收设备发现信号 ,且信号接收设备是 在信号接收设备的下行定时接收 D2D数据信号时，
信号发送设备解析所述设备发现信号 ,获得所述设备发现信号中携带的接 收定时信息；
根据所述基站的定时7 ί'以及所述接收定时信息中的 7¾值， 计算出所述信 号接收设备的下行定时 Γ3 , 具体的计算公式为：
T'=T'+TA/2; 根据所述到达时刻 以及所述下行定时 Γ3 ， 计算出向信号接收设备发送
D2D数据信号的时刻 ， 具体的计算公式为：
Τ5 = ― (Γ4 -Γ3) = (7 +ΤΑ/2)- [Τ4― (Γ; + TA 12)] = 2T; +TA_T4。
当信号接收设备是在信号接收设备的上行定时 ^发送设备发现信号，信号 发送设备是在信号发送设备的上行定时接收设备发现信号，且信号接收设备是 在信号接收设备的下行定时接收 D2D数据信号时，
信号发送设备根据所述基站的定时7 ,计算出所述信号接收设备的下行定时7^ 和所述信号接收设备的上行定时 ， 具体的计算公式为：
=Τ +ΤΑΙ2 Τ2'=Τχ'-ΤΑΙ2。
根据所述到达时刻 以及所述下行定时 和所述上行定时 ， 计算出向信 号接收设备发送 D2D数据信号的时刻 rs , 具体的计算公式为：
Τ5 = -{Τ4-Τ2) = (Τ; + ΤΑ/2)-[Τ4-(Τ; -ΤΑ/2)] = 2Τ[― Τ4。
当信号接收设备是在信号接收设备的发送定时 ^发送设备发现信号，信号 发送设备是在信号发送设备设置的接收定时接收设备发现信号，且信号接收设 备是在信号接收设备设置的接收定时接收 D2D数据信号时，
信号发送设备解析所述设备发现信号 ,获得所述设备发现信号中携带的接 收定时信息；
根据所述基站的定时 Τ;以及所述接收定时信息中的 Δ7值， 计算出所述信 号接收设备的接收行定时 C3和所述信号接收设备的发送定时 C2。 具体的计算 公式为：
I =Τ'+ΑΈ = T; + AT2
其中， ΔΓ; = C2 - J! , AT2 = C3 - Τ , AT = C2 + C3 - 2Τ；
其中， 是由信号接收设备确定的所述基站的定时， 是由信号发送设备 确定的所述基站的定时， 是信号接收设备的发送定时， 是信号接收设备 的接收定时；
根据所述到达时刻 以及所述接收定时 C3和所述发送定时 C2 ,计算出向同 一信号接收设备发送 D2D数据信号的时刻 Γ5 , 具体的计算公式为：
7 ' = C3 _ (Γ4 _ C2 ) = ( ' + ΔΓ2 ) _ [Γ4 _ (7 ' + Δ7; )] = 27；' + ΔΓ _ Γ4。 在步骤 S204中，信号发送设备在所述时刻 发送 D2D数据信号至信号接 收设备。
本实施例， 多个信号发送设备接收基站发送的蜂窝定时信号，根据所述蜂 窝定时信号确定所述基站的定时 ； 在设备发现子帧， 多个信号发送设备分别 接收同一信号接收设备发送的设备发现信号，并记录所述设备发现信号的到达 时刻 ； 各个信号发送设备再分别根据所述到达时刻 、 所述基站的定时7 ί' , 计算出向同一信号接收设备发送 D2D数据信号的时刻 ， 各个信号发送设备 分
别在所述时刻 向同一信号接收设备发送 D2D数据信号， 可以同时到达所述 信号接收设备， 实现了多个信号发送设备的同步。
实施例二
图 4 示出了本发明实施例二提供的用户设备到用户设备的通信方法的实 现流程， 在本实施例中， 所述用户设备分为信号发送设备和信号接收设备， 每 个信号接收设备以信号接收设备的上行定时发送设备发现信号，每个信号发送 设备以信号发送设备的上行定时接收其它用户设备发送的设备发现信号，所述 设备发送信号中携带接收定时信息 ,每个信号发送设备根据信号接收设备发送 的设备发现信号的到达时刻 ； 再根据所述到达时刻 、 所述基站的定时7 ί'和 所述接收定时信息，计算出向同一信号接收设备发送 D2D数据信号的时刻 , 以确保不同信号发送设备发送的 D2D 数据信号同时到达同一个信号接收设 备， 信号接收设备在自己的上行定时位置接收信号发送设备发送的 D2D数据 信号。本实施例特别适用于 D2D通信共享蜂窝 FDD上行频率和共享蜂窝 TDD 频率的场景， 详述如下：
在步骤 1中，信号接收设备接收基站发送的蜂窝定时信号，根据所述蜂窝 定时信号确定信号接收设备的下行定时 r3、 上行定时 r2及所述基站的定时 。
在步骤 2中， 多个信号发送设备接收基站发送的蜂窝定时信号，根据所述 蜂窝定时信号确定信号发送设备的下行定时、 上行定时及所述基站的定时7 。
需要说明的是， 步骤 1、 2没有先后次序之分， 可以串行执行， 也可以并 行执行。
在步骤 3中，在设备发现子帧，信号接收设备以信号接收设备的上行定时 τ2发送设备发现信号， 所述设备发现信号中携带信号接收设备的接收定时信 息， 所述接收定时信息中包括 7¾值。
在步骤 4中，在设备发现子帧， 多个信号发送设备以信号发送设备的上行 定时接收同一信号接收设备发送的设备发现信号，并记录所述设备发现信号的 到达时刻 。
在步骤 5中，各个信号发送设备分别解析所述设备发现信号， 获得所述设 备发现信号中携带的接收定时信息。 在本实施例中， 所述接收定时信息包括信号接收设备的 7¾值。 在步骤 6中，各个信号发送设备分别根据所述基站的定时7 ί'以及所述接收 定时信息中的 7¾值， 计算出所述信号接收设备的上行定时 。
在本实施例中， 的具体的计算公式为：
τ2'=Τ;_ΤΑΙ2。
在步骤 7中，各个信号发送设备分别根据所述到达时刻 以及所述上行定 时7^ 计算出向同一信号接收设备发送 D2D数据信号的时刻 。
在本实施例中， 具体的计算公式为：
Τ5 =Τ2-{Τ4-Τ2) = (Τ; -ΤΑ/2)- [Τ4― (7 - ΤΑ 12)] = 2Γ; -ΤΑ_Τ4。
另外， 本实施例中的7 ί、 Γ；、 Τ2 , Ί Τ 以及7 ^之间的关系参见图 5, 其中，信号发送设备用 D2D— UE— Τχ表示，信号接收设备用 D2D— UE— Rx表示。
具体的 的计算分析如下：
由于信号发送设备和信号接收设备首先都知道自己的下行定时，这样可以 根据背景技术中的 TA技术分析计算出7 ί和7 ί', 为信号接收设备计算的 eNB 定时， 为信号发送设备计算的 eNB定时。 其实这两个值在绝对时间上相同， 但由于每个用户设备 UE的相对时间不相同， 所以这两个值不同。 为信号接 收设备的上行定时， τ2为信号发送设备根据信号接收设备发送的设备发现信号 中携带的 ΤΑ值计算出来的信号接收设备的上行定时。 这两个值的关系与7 ί和 的关系类似，也是绝对时间相同，但值不同。 为信号接收设备的下行定时。 当信号接收设备以它的上行定时 发送设备发现信号，那么这个设备发现信号 到达信号发送设备的时刻为 ，那信号接收设备与信号发送设备之间的传输时 延为 那么当信号发送设备向信号接收设备发送 D2D数据信号时， 信号 发送设备的发送时刻就要比信号接收设备的接收时刻 (即信号接收设备的上 行定时）提前7 ^ _ ， 因此信号发送设备向同一信号接收设备发送 D2D数据信 号的时刻 为： = = 2(Χ - ΤΑ/2) - Τ4 = 2Τ; - ΤΑ - Τ4。 在步骤 8中、 各个信号发送设备在所述时刻 发送 D2D数据信号至同一 信号接收设备。
其中， 步骤 5、 6、 7包括在实施例一的步骤 S103中， 在此不再赘述。 实施例三
图 6 示出了本发明实施例三提供的用户设备到用户设备的通信方法的实 现流程， 在本实施例中， 所述用户设备分为信号发送设备和信号接收设备， 每 个信号接收设备以信号接收设备的下行定时发送设备发现信号，每个信号发送 设备以信号发送设备的下行定时接收其它用户设备发送的设备发现信号，所述 设备发送信号中携带接收定时信息 ,每个信号发送设备根据信号接收设备发送 的设备发现信号的到达时刻 ； 再根据所述到达时刻 、 所述基站的定时7 ί'和 所述接收定时信息，计算出向同一信号接收设备发送 D2D数据信号的时刻 , 以确保不同信号发送设备发送的 D2D数据信号在信号接收设备的下行定时位 置同时到达该信号接收设备，信号接收设备可以在自己的下行定时位置接收到 所有信号发送设备发送的 D2D数据信号。本实施例特别适用于 D2D通信共享 蜂窝 FDD下行频率的场景， 详述如下：
在步骤 11中， 信号接收设备接收基站发送的蜂窝定时信号， 根据所述蜂 窝定时信号确定自己的下行定时 Γ3、 上行定时 Γ2及所述基站的定时；。
在步骤 12中， 多个信号发送设备接收基站发送的蜂窝定时信号， 根据所 述蜂窝定时信号确定信号发送设备的下行定时、 上行定时及所述基站的定时 T；。
需要说明的是， 步骤 11、 12没有先后次序之分， 可以串行执行， 也可以 并行执行。
在步骤 13中， 在设备发现子帧， 信号接收设备以信号接收设备的下行定 时7^发送设备发现信号，所述设备发现信号中携带信号接收设备的接收定时信 息， 所述接收定时信息中包括 7¾值。
在步骤 14中， 在设备发现子帧， 多个信号发送设备以信号发送设备的下 行定时接收同一信号接收设备发送的设备发现信号，并记录所述设备发现信号 的到达时刻 。
在步骤 15中， 各个信号发送设备分别解析所述设备发现信号， 获得所述 设备发现信号中携带的接收定时信息。
在本实施例中， 所述接收定时信息包括信号接收设备的 7¾值。
在步骤 16中， 各个信号发送设备根据所述基站的定时7 ί'以及所述接收定 时信息中的 7¾值， 计算出所述信号接收设备的下行定时73 。
在本实施例中， 的具体的计算公式为：
= Τ; + ΤΑ/ 2。
在步骤 17中， 各个信号发送设备根据所述到达时刻 以及所述下行定时 Τ3 , 计算出向同一信号接收设备发送 D2D数据信号的时刻 。
在本实施例中， 的具体计算公式为：
Τ5 = - (Γ4 -Γ3 ) = (7 + ΤΑ/ 2) - [Τ4 - (Τ + TA 12)] = 27；' + 7¾ _ Γ4。
步骤 18、 各个信号发送设备在所述时刻 发送 D2D数据信号至同一信号 接收设备。 其中， 步骤 15、 16、 17包括在实施例一的步骤 S103中， 在此不再赘述。 另外， 本实施例中的7 i、 r；、 T、 τ τ3、 以及 之间的关系参见图 7 , 其中，信号发送设备用 D2D— UE— Τχ表示，信号接收设备用 D2D— UE— Rx表示。
实施例四
图 8示出了本发明实施例四提供的用户设备到用户设备的通信方法的 实现流程， 在本实施例中， 所述用户设备分为信号发送设备和信号接收设 备， 每个信号接收设备以信号接收设备的上行定时发送设备发现信号， 每 个信号发送设备以信号发送设备的上行定时接收其它用户设备发送的设备 发现信号， 每个信号发送设备根据信号接收设备发送的设备发现信号的到 达时刻 ； 再根据所述到达时刻 以及所述基站的定时7 ί' , 计算出向同一信 号接收设备发送 D2D数据信号的时刻 Γ5 , 以确保不同信号发送设备发送的 D2D数据信号在信号接收设备的下行定时位置同时到达该信号接收设备， 信号接收设备可以在自己的下行定时位置接收到所有信号发送设备发送的 D2D数据信号。本实施例特别适用于 D2D同信釆用 FDD模式共享蜂窝 FDD 上下行频谱的场景， 详述如下：
在步骤 21中， 信号接收设备接收基站发送的蜂窝定时信号， 根据所述蜂 窝定时信号确定信号接收设备的下行定时 Γ3、 上行定时 τ2及所述基站的定时
Τ\。
在步骤 22中， 多个信号发送设备接收基站发送的蜂窝定时信号， 根据所 述蜂窝定时信号确定信号发送设备的下行定时、 上行定时及所述基站的定时 τ；。
需要说明的是， 步骤 21、 22没有先后次序之分， 可以串行执行， 也可以 并行执行。
在步骤 23中， 在设备发现子帧， 信号接收设备以自己的上行定时 Γ2时刻 发送设备发现信号， 所述设备发现信号中不携带信号接收设备的接收定时信 息， 即所述设备发现信号中不包括 7¾值。
在步骤 24中， 在设备发现子帧， 多个信号发送设备以自己的上行定时接 收信号接收设备发送的设备发现信号， 并记录所述设备发现信号的到达时刻 Ί。
在步骤 25中， 各个信号发送设备根据所述基站的定时7 ί' , 计算出所述信 号接收设备的下行定时 和所述信号接收设备的上行定时 。
在本实施例中， 和 具体的计算公式为：
=Τ +ΤΑΙ2
Τ2'=Τ;_ΤΑΙ2。
在步骤 26中，各个信号发送设备根据所述到达时刻 以及所述下行定时 和所述上行定时 ，计算出向同一信号接收设备发送 D2D数据信号的时刻 。
在本实施例中， 具体的计算公式为：
Τ5 = -{Τ4-Τ2) = (Τ; + ΤΑ/2)-[Τ4-(Τ; -ΤΑ/2)] = 2Τ[― Τ4。
在步骤 27中、各个信号发送设备在所述时刻 rs发送 D2D数据信号至同一 信号接收设备。
其中， 步骤 25、 26包括在实施例一的步骤 S103中， 在此不再赘述。 另外， 本实施例中的7 ί、 τ；、 τ2 , 、 τ τ 以及7 ^之间的关系参见 图 9,其中，信号发送设备用 D2D— UE— Τχ表示，信号接收设备用 D2D— UE— Rx 表示。 实施例五
图 10示出了本发明实施例五提供的用户设备到用户设备的通信方法的实 现流程， 在本实施例中， 所述用户设备分为信号发送设备和信号接收设备， 每 个信号接收设备以信号接收设备的发送定时发送设备发现信号 ,每个信号发送 设备以信号发送设备的接收定时接收其它用户设备发送的设备发现信号，所述 设备发送信号中携带的接收定时信息 ,每个信号发送设备根据信号接收设备发 送的设备发现信号的到达时刻7^ 再根据所述到达时刻 、 所述基站的定时7 ί' 以及所述接收定时信息， 计算出向同一信号接收设备发送 D2D数据信号的时 刻 Γ5 , 以确保不同信号发送设备发送的 D2D数据信号在信号接收设备的接收 定时位置同时到达该信号接收设备，信号接收设备可以在自己的接收定时位置 接收到所有信号发送设备发送的 D2D数据信号， 详述如下：
在步骤 31中， 信号接收设备接收基站发送的蜂窝定时信号， 根据所述蜂 窝定时信号确定信号接收设备的接收定时 C3、 发送定时 C2及所述基站的定时 。
在步骤 32中， 多个信号发送设备接收基站发送的蜂窝定时信号， 根据所 述蜂窝定时信号确定信号发送设备的下行定时、 上行定时及所述基站的定时 τ；。
需要说明的是， 步骤 31、 32没有先后次序之分， 可以串行执行， 也可以 并行执行。
在步骤 33中， 在设备发现子帧， 信号接收设备以信号接收设备的发送定 时 τ2发送设备发现信号，所述设备发现信号中携带信号接收设备的接收定时信 息， 所述接收定时信息中包括 Δ7值。 其中， 在本实施例中， Ar = C2+C3— 27；。
在步骤 34中， 在设备发现子帧， 多个信号发送设备以信号发送设备的接 收定时接收信号接收设备发送的设备发现信号，并记录所述设备发现信号的到 达时刻 。
在步骤 35中， 各个信号发送设备分别解析所述设备发现信号， 获得所述 设备发现信号中携带的接收定时信息。
在本实施例中， 所述接收定时信息包括信号接收设备的 Δ7值。
在步骤 36中， 各个信号发送设备根据所述基站的定时7 ί'以及所述 Δ7值， 计算出所述信号接收设备的接收行定时 C3和所述信号接收设备的发送定时 c2。 具体的计算公式为：
C2=T^+AT,
C3 =T; +ΑΤ2
其中， Δ = C2— , ΔΓ2 =C3 -Tx;
其中， 是由信号接收设备确定的所述基站的定时， Α是由信号发送设备 确定的所述基站的定时， 是信号接收设备的发送定时， G是信号接收设备 的接收定时。
在步骤 37中， 各个信号发送设备根据所述到达时刻 以及所述接收定时 C3和所述发送定时 C2 , 计算出向同一信号接收设备发送 D2D数据信号的时刻
T5。
具体的计算公式为：
7' = C3 _ (Γ4 _ C2 ) = ( ' + ΔΓ2 ) _ [Γ4 _ (7' + Δ7; )] = 27；' + ΔΓ _ Γ4。
在步骤 38中、各个信号发送设备在所述时刻 Τ5发送 D2D数据信号至同一 信号接收设备。
其中， 发送定时是指： 信号发送设备发送设备发现信号的时间。 类似于实 施例二中的上行定时和实施例三中的下行定时。 但这两个只是发送定时的特 例， 本实施例中的发送定时可以是其它时间， 比如通过 GPS获得的定时等。
接收定时是指： 信号接收设备在 D2D数据通信阶段接收其它 D2D信号发 送设备发送的 D2D数据的时间。 类似于实施例二中的上行定时和实施例三中 的下行定时。但这两个只是发送定时的特例， 本实施例中的接收定时可以是其 它时间， 比如通过 GPS获得的定时等。
其中， 步骤 35、 36、 37包括在实施例一的步骤 S103中， 在此不再赘述。 另外， 本实施例中的7 ί、 r；、 C2、 C c3、 G、 以及 之间的关系参见 图 11 ,其中，信号发送设备用 D2D— UE— Tx表示，信号接收设备用 D2D— UE— Rx 表示。
实施例六
图 12示出了本发明实施例六提供的用户设备的具体结构框图， 为了便于 说明，仅示出了与本发明实施例相关的部分。该用户设备和基站组成无线网络 系统， 所述用户设备包括： 定时位置确定单元 121、 到达时刻确定单元 122、 发送时刻确定单元 123和信号发送单元 124。
其中， 定时位置确定单元 121 , 用于接收基站发送的蜂窝定时信号， 并根 据所述蜂窝定时信号确定所述基站的定时 '；
到达时刻确定单元 122, 用于在设备发现子帧， 接收信号接收设备发送的 设备发现信号， 并记录所述设备发现信号的到达时刻 ；
发送时刻确定单元 123 , 用于根据所述到达时刻7^和所述基站的定时7 ί' , 计算出向信号接收设备发送用户设备到用户设备 D2D数据信号的时刻 Γ5 信号发送单元 124, 用于在所述时刻 发送 D2D数据信号至信号接收设 备。
具体的各个单元的执行情况， 可参见实施例 1中的描述， 在此不再赘述。 实施例七
图 13示出了本发明实施例七提供的用户设备的具体结构框图， 为了便于 说明，仅示出了与本发明实施例相关的部分。该用户设备和基站组成无线网络 系统， 所述用户设备包括： 定时位置确定单元 131、 到达时刻确定单元 132、 发送时刻确定单元 133和信号发送单元 134。
定时位置确定单元 131、 到达时刻确定单元 132、 发送时刻确定单元 133 和信号发送单元 134的具体功能请参见实施例六的描述， 在此不再赘述。
其中，所述发送时刻确定单元 133包括：第一接收定时信息获取模块 1331、 第一上行定时获取模块 1332和第一发送时刻确定模块 1333。
具体的， 第一接收定时信息获取模块 1331 , 用于当信号接收设备是在信 号接收设备的上行定时 ^发送设备发现信号 ,信号发送设备是在信号发送设备 的上行定时接收设备发现信号，且信号接收设备是在信号接收设备的上行定时 接收信号发送设备发送的 D2D数据信号时， 解析所述设备发现信号， 获得 所述设备发现信号中携带的接收定时信息；
第一上行定时获取模块 1332 , 用于根据所述基站的定时7 ί'以及所述接收 定时信息中的 7¾值， 计算出所述信号接收设备的上行定时7^ 计算公式为： f2 = T[ -TAI2 \
第一发送时刻确定模块 1333 , 用于根据所述到达时刻 以及所述上行定 时7^ 计算出向信号接收设备发送 D2D数据信号的时刻 ， 计算公式为： Τ5 =Τ2-{Τ4-Τ2) = (Τ; -ΤΑ/2)- [Τ4― (7 - ΤΑ 12)] = 2Γ; -ΤΑ_Τ4。
具体的各个模块的执行情况， 可参见实施例 1和实施例 2中的描述，在此 不再赘述。
实施例八
图 14示出了本发明实施例八提供的用户设备的具体结构框图， 为了便于 说明，仅示出了与本发明实施例相关的部分。该用户设备和基站组成无线网络 系统， 所述用户设备包括： 定时位置确定单元 141、 到达时刻确定单元 142、 发送时刻确定单元 143和信号发送单元 144。
定时位置确定单元 141、 到达时刻确定单元 142、 发送时刻确定单元 143 和信号发送单元 144的具体功能请参见实施例六的描述， 在此不再赘述。
其中，所述发送时刻确定单元 143包括：第二接收定时信息获取模块 1431、 第一下行定时获取模块 1432和第二发送时刻确定模块 1433。
具体的， 第二接收定时信息获取模块 1431, 用于当信号接收设备是在信 号接收设备的下行定时7^发送设备发现信号，信号发送设备是在信号发送设备 的下行定时接收设备发现信号，且信号接收设备是在信号接收设备的下行定时 接收 D2D数据信号时， 解析所述设备发现信号， 获得所述设备发现信号中 携带的接收定时信息；
第一下行定时获取模块 1432, 用于根据所述基站的定时7 ί'以及所述接收 定时信息中的 7¾值， 计算出所述信号接收设备的下行定时 Γ3, 计算公式为：
=T;+TA/2 第二发送时刻确定模块 1433, 用于根据所述到达时刻 以及所述下行定 时 Γ3 , 计算出向信号接收设备发送 D2D数据信号的时刻 ， 计算公式为： Τ5 = ― (Γ4 -Γ3) = (7 +ΤΑ/2)- [Τ4― (Γ; + TA 12)] = 2T; +TA_T4。
具体的各个模块的执行情况， 可参见实施例 1和实施例 3中的描述，在此 不再赘述。
实施例九
图 15示出了本发明实施例九提供的用户设备的具体结构框图， 为了便于 说明，仅示出了与本发明实施例相关的部分。该用户设备和基站组成无线网络 系统， 所述用户设备包括： 定时位置确定单元 151、 到达时刻确定单元 152、 发送时刻确定单元 153和信号发送单元 154。
定时位置确定单元 151、 到达时刻确定单元 152、 发送时刻确定单元 153 和信号发送单元 154的具体功能请参见实施例六的描述， 在此不再赘述。
其中， 所述发送时刻确定单元 153包括： 上下行定时获取模块 1531和第三发 送时刻确定模块 1532。
具体的， 上下行定时获取模块 1531, 用于当信号接收设备是在信号接收 设备的上行定时 τ2发送设备发现信号，信号发送设备是在信号发送设备的上行 定时接收设备发现信号， 且信号接收设备是在信号接收设备的下行定时接收
D2D数据信号时， 根据所述基站的定时7 ί', 计算出所述信号接收设备的下行 定时 和所述信号接收设备的上行定时 ， 计算公式为：
=Τ +ΤΑΙ2
t2=T[-TAI2
第三发送时刻确定模块 1532, 用于根据所述到达时刻 以及所述下行定 时 和所述上行定时7^ 计算出向信号接收设备发送 D2D数据信号的时刻 Τ5 , 计算公式为：
T5 = - {Τ4 - Τ2) = (Τ; + ΤΑ/2) -[Τ4 - (Τ; - ΤΑ/2)] = 2Τ[― Τ4。
具体的各个模块的执行情况， 可参见实施例 1和实施例 4中的描述，在此 不再赘述。
实施例十
图 16示出了本发明实施例十提供的用户设备的具体结构框图， 为了便于 说明，仅示出了与本发明实施例相关的部分。该用户设备和基站组成无线网络 系统， 所述用户设备包括： 定时位置确定单元 161、 到达时刻确定单元 162、 发送时刻确定单元 163和信号发送单元 164。
定时位置确定单元 161、 到达时刻确定单元 162、 发送时刻确定单元 163 和信号发送单元 164的具体功能请参见实施例六的描述， 在此不再赘述。
其中，所述发送时刻确定单元 163包括：第三接收定时信息获取模块 1631、 接收发送定时获取模块 1632和第四发送时刻确定模块 1633。
具体的， 第四接收定时信息获取模块 1631 , 用于当信号接收设备是在信 号接收设备的发送定时 2发送设备发现信号，信号发送设备是在信号发送设备 设置的接收定时接收设备发现信号，且信号接收设备是在信号接收设备设置的 接收定时接收 D2D数据信号时， 解析所述设备发现信号， 获得所述设备发现 信号中携带的接收定时信息；
接收发送定时获取模块 1632 , 用于根据所述基站的定时 7；'以及所述接收 定时信息中的 Δ7值， 计算出所述信号接收设备的接收定时^：3和所述信号接收 设备的发送定时 C2 , 计算公式为：
I = Τ' + ΑΈ C3 =7 +ΔΓ2 , 其中 A =C2—；, AT2 =C3 -Τ , ΑΤ≡ΑΤ^+ΑΤ2, AT = C2+C3 -2Τ , ^是由信 号接收设备确定的基站的定时， 是信号接收设备的发送定时， 是信号接 收 设备的接收定时； 第四发送时刻确定模块 1633, 用于根据所述到达时刻 以及所述接收定 时 C3和所述发送定时 C2 ,计算出向信号接收设备发送 D2D数据信号的时刻 , 计算公式为：
7' = C3 _ (Γ4 _ C2 ) = ( ' + ΔΓ2 ) _ [Γ4 _ (7' + Δ7; )] = 27；' + ΔΓ _ Γ4。 具体的各个模块的执行情况， 可参见实施例 1和实施例 5中的描述，在此 不再赘述。 值得注意的是， 上述系统实施例中， 所包括的各个单元只是按照功能逻辑 进行划分的，但并不局限于上述的划分，只要能够实现相应的功能即可； 另夕卜， 各功能单元的具体名称也只是为了便于相互区分，并不用于限制本发明的保护 范围。 另外 ,本领域普通技术人员可以理解实现上述各实施例方法中的全部或部 分步骤是可以通过程序来指令相关的硬件来完成，相应的程序可以存储于一计 算机可读取存储介质中， 所述的存储介质， 如 ROM/RAM、 磁盘或光盘等。
以上所述仅为本发明的较佳实施例而已， 并不用以限制本发明， 凡在本发 明的精神和原则之内所作的任何修改、等同替换和改进等， 均应包含在本发明 的保护范围之内。

Claims

权 利 要 求
1、 一种用户设备到用户设备的通信方法， 其特征在于， 所述方法包括： 信号发送设备接收基站发送的蜂窝定时信号，并根据所述蜂窝定时信号确 定所述基站的定时 ；
在设备发现子帧， 信号发送设备接收信号接收设备发送的设备发现信号， 并记录所述设备发现信号的到达时刻 ；
信号发送设备根据所述到达时刻 和所述基站的定时 Τ; ,计算出向信号接 收设备发送用户设备到用户设备 D2D数据信号的时刻 rs
信号发送设备在所述时刻 发送 D2D数据信号至信号接收设备。
2、 如权利要求 1所述的方法， 其特征在于， 所述信号发送设备根据所述 到达时刻 和所述基站的定时7 ί' , 计算出向信号接收设备发送 D2D数据信号 的时刻 Γ5包括：
当信号接收设备是在信号接收设备的上行定时 ^发送设备发现信号，信号 发送设备是在信号发送设备的上行定时接收设备发现信号，且信号接收设备是 在信号接收设备的上行定时 接收信号发送设备发送的 D2D数据信号时， 信号发送设备解析所述设备发现信号 ,获得所述设备发现信号中携带的接 收定时信息；
根据所述基站的定时7 以及所述接收定时信息中的 7¾值， 计算出所述信 号接收设备的上行定时7^ 计算公式为：
t2 = T[ -TAI2
根据所述到达时刻 以及所述上行定时 ， 计算出向信号接收设备发送 D2D数据信号的时刻 ， 计算公式为： T5 =T2-{T4-T2) = (Τ; -ΤΑ/2)- [Τ4― (7 - ΤΑ 12)] = 2Γ; -ΤΑ_Τ4。
3、 如权利要求 1所述的方法， 其特征在于， 所述信号发送设备根据所述 到达时刻 和所述基站的定时7 ί' , 计算出向信号接收设备发送 D2D数据信号 的时刻 Γ5包括：
当信号接收设备是在信号接收设备的下行定时 发送设备发现信号，信号 发送设备是在信号发送设备的下行定时接收设备发现信号 ,且信号接收设备是 在信号接收设备的下行定时 接收 D2D数据信号时，
信号发送设备解析所述设备发现信号 ,获得所述设备发现信号中携带的接 收定时信息；
根据所述基站的定时7 ί'以及所述接收定时信息中的 7¾值， 计算出所述信 号接收设备的下行定时 Γ3 , 计算公式为：
=T;+TA/2
根据所述到达时刻 以及所述下行定时 Γ3 ， 计算出向信号接收设备发送
D2D数据信号的时刻 计算公式为：
Τ5 = - (Τ4 -Γ3) = (7 +ΤΑ/2)- [Τ4 - (Τ + TA 12)] = 2T; +TA_T4。
4、 如权利要求 1所述的方法， 其特征在于， 所述信号发送设备根据所述 到达时刻 和所述基站的定时7 ί' , 计算出向信号接收设备发送 D2D数据信号 的时刻 Γ5包括：
当信号接收设备是在信号接收设备的上行定时 ^发送设备发现信号，信号 发送设备是在信号发送设备的上行定时接收设备发现信号，且信号接收设备是 在信号接收设备的下行定时接收 D2D数据信号时，
信号发送设备根据所述基站的定时7 ,计算出所述信号接收设备的下行定 时7^和所述信号接收设备的上行定时 ， 计算公式为：
=T +TAI2
f2=T[-TAI2 根据所述到达时刻 Τ4以及所述下行定时 和所述上行定时 ， 计算出向信 号接收设备发送 D2D数据信号的时刻 rs , 计算公式为：
Τ5 = -{Τ4-Τ2) = (Τ; + ΤΑ/2)-[Τ4-(Τ; -ΤΑ/2)] = 2Τ[― Τ4。
5、 如权利要求 1所述的方法， 其特征在于， 所述信号发送设备根据所述 到达时刻 和所述基站的定时7 ί' , 计算出向信号接收设备发送 D2D数据信号 的时刻 Γ5包括：
当信号接收设备是在信号接收设备的发送定时 c2发送设备发现信号，信号 发送设备是在信号发送设备设置的接收定时接收设备发现信号，且信号接收设 备是在信号接收设备设置的接收定时接收 D2D数据信号时，
信号发送设备解析所述设备发现信号 ,获得所述设备发现信号中携带的接 收定时信息；
根据所述基站的定时 7；'以及所述接收定时信息中的 Δ7值， 计算出所述信 号接收设备的接收定时 C3和所述信号接收设备的发送定时 C2 , 计算公式为：
02=Τ^+ΑΤλ
C3 = +ΔΓ2
其中， ΔΓ; = C2 - J! , AT2 =C3 -Τ , ΑΤ≡ΑΤ^+ΑΤ2, AT = C2+C3 -2Τ , 是由 信号接收设备确定的基站的定时， 是信号接收设备的发送定时， G是信号 接收设备的接收定时；
根据所述到达时刻 以及所述接收定时 c3和所述发送定时 c2 ,计算出向信 号接收设备发送 D2D数据信号的时刻 Γ5 , 计算公式为：
7 ' = C3 _ (Γ4 _ C2 ) = ( ' + ΔΓ2 ) _ [Γ4 _ (7 ' + Δ7; )] = 27；' + ΔΓ _ Γ4。
6、 一种用户设备， 其特征在于， 所述用户设备包括：
定时位置确定单元， 用于接收基站发送的蜂窝定时信号， 并根据所述蜂窝 定时信号确定所述基站的定时 Τ;；
到达时刻确定单元， 用于在设备发现子帧，接收信号接收设备发送的设备 发现信号， 并记录所述设备发现信号的到达时刻 ；
发送时刻确定单元， 用于根据所述到达时刻7^和所述基站的定时7 ί' , 计算 出向信号接收设备发送用户设备到用户设备 D2D数据信号的时刻 rs；
信号发送单元， 用于在所述时刻 发送 D2D数据信号至信号接收设备。
7、 如权利要求 6所述的用户设备， 其特征在于， 所述发送时刻确定单元 包括：
第一接收定时信息获取模块，用于当信号接收设备是在信号接收设备的上 行定时 ^发送设备发现信号 ,信号发送设备是在信号发送设备的上行定时接收 设备发现信号，且信号接收设备是在信号接收设备的上行定时 接收信号发送 设备发送的 D2D数据信号时， 解析所述设备发现信号， 获得所述设备发现信 号中携带的接收定时信息；
第一上行定时获取模块，用于根据所述基站的定时7以及所述接收定时信 息中的 7¾值， 计算出所述信号接收设备的上行定时7^ 计算公式为：
t2 = T[ -TAI2
第一发送时刻确定模块， 用于根据所述到达时刻 以及所述上行定时 ， 计算出向信号接收设备发送 D2D数据信号的时刻 ， 计算公式为： T5 =T2-{T4-T2) = (Τ; -ΤΑ/2)- [Τ4― (7 - ΤΑ 12)] = 2Γ; -ΤΑ_Τ4。
8、 如权利要求 6所述的用户设备， 其特征在于， 所述发送时刻确定单元 包括：
第二接收定时信息获取模块，用于当信号接收设备是在信号接收设备的下 行定时 发送设备发现信号，信号发送设备是在信号发送设备的下行定时接收 设备发现信号， 且信号接收设备是在信号接收设备的下行定时 接收 D2D数 据信号时， 解析所述设备发现信号， 获得所述设备发现信号中携带的接收定时 信息；
第一下行定时获取模块，用于根据所述基站的定时7以及所述接收定时信 息中的 7¾值， 计算出所述信号接收设备的下行定时 Γ3, 计算公式为：
=T;+TA/2
第二发送时刻确定模块， 用于根据所述到达时刻 以及所述下行定时 Γ3 , 计算出向信号接收设备发送 D2D数据信号的时刻 rs , 计算公式为：
T5 = ― (Γ4 -Γ3) = (7 +ΤΑ/2)- [Τ4― (Γ; + TA 12)] = 2T; +TA_T4。
9、 如权利要求 6所述的用户设备， 其特征在于， 所述发送时刻确定单元 包括：
上下行定时获取模块，用于当信号接收设备是在信号接收设备的上行定时
T2发送设备发现信号 ,信号发送设备是在信号发送设备的上行定时接收设备发 现信号，且信号接收设备是在信号接收设备的下行定时接收 D2D数据信号时， 根据所述基站的定时7 ，计算出所述信号接收设备的下行定时7^和所述信号接 收设备的上行定时 ， 计算公式为：
Τ'=Τ'+ΤΑ/2 f2=T[-TAI2
第三发送时刻确定模块，用于根据所述到达时刻 以及所述下行定时 和 所述上行定时 ， 计算出向信号接收设备发送 D2D数据信号的时刻 ， 计算 公式为：
Τ5 = -{Τ4-Τ2) = (Τ; + ΤΑ/2)-[Τ4-(Τ; -ΤΑ/2)] = 2Τ[ - Τ4。
10、 如权利要求 6所述的用户设备， 其特征在于， 所述发送时刻确定单元 包括：
第三接收定时信息获取模块，用于当信号接收设备是在信号接收设备的发 送定时 C2发送设备发现信号，信号发送设备是在信号发送设备设置的接收定时 接收设备发现信号， 且信号接收设备是在信号接收设备设置的接收定时接收 D2D数据信号时， 解析所述设备发现信号， 获得所述设备发现信号中携带的 接收定时信息；
接收发送定时获取模块，用于根据所述基站的定时；'以及所述接收定时信 息中的 Δ7值， 计算出所述信号接收设备的接收定时^：3和所述信号接收设备的 发送定时 C2, 计算公式为：
02=Τ^+ΑΤλ
C3 = +ΔΓ2 ,
其中 A =C2—；, AT2 =C3 -Τ , ΑΤ≡ΑΤ^+ΑΤ2, AT = C2+C3 -2Τ , ^是由信 号接收设备确定的基站的定时， 是信号接收设备的发送定时， 是信号接 收
设备的接收定时；
第四发送时刻确定模块，用于根据所述到达时刻 以及所述接收定时 (^3和 所述发送定时 C2 , 计算出向信号接收设备发送 D2D数据信号的时刻 Γ5 , 计算 公式为：
T5 = C3 _ (Γ4 _ C2) = (Γ; + ΔΓ2) _[Γ4 _ (7' + Δ7;)] = 27；' + ΔΓ _ Γ4。
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