WO2015054903A1 - D2d终端间的初始同步方法及设备 - Google Patents

D2d终端间的初始同步方法及设备 Download PDF

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Publication number
WO2015054903A1
WO2015054903A1 PCT/CN2013/085499 CN2013085499W WO2015054903A1 WO 2015054903 A1 WO2015054903 A1 WO 2015054903A1 CN 2013085499 W CN2013085499 W CN 2013085499W WO 2015054903 A1 WO2015054903 A1 WO 2015054903A1
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WIPO (PCT)
Prior art keywords
synchronization
terminal
time
transmitting
slave
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PCT/CN2013/085499
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English (en)
French (fr)
Inventor
余志钦
张维良
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Huawei Technologies Co Ltd
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Huawei Technologies Co Ltd
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Application filed by Huawei Technologies Co Ltd filed Critical Huawei Technologies Co Ltd
Priority to CN201380003550.2A priority Critical patent/CN105009654A/zh
Priority to EP13895594.3A priority patent/EP3060017A4/en
Priority to PCT/CN2013/085499 priority patent/WO2015054903A1/zh
Publication of WO2015054903A1 publication Critical patent/WO2015054903A1/zh
Priority to US15/099,749 priority patent/US20160249311A1/en
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W56/00—Synchronisation arrangements
    • H04W56/001—Synchronization between nodes
    • H04W56/0015—Synchronization between nodes one node acting as a reference for the others
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W4/00—Services specially adapted for wireless communication networks; Facilities therefor
    • H04W4/70—Services for machine-to-machine communication [M2M] or machine type communication [MTC]
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W56/00—Synchronisation arrangements
    • H04W56/001—Synchronization between nodes
    • H04W56/0025—Synchronization between nodes synchronizing potentially movable access points

Definitions

  • the present invention relates to the field of wireless communication technologies, and in particular, to an initial synchronization method and device between D2D terminals. Background technique
  • the existing outdoor network can achieve higher outdoor coverage than indoor coverage, especially in indoor corners or basements, where the strength of the signal is weak, resulting in inability to communicate.
  • the meter that is expected to be placed in the basement can regularly report data to the power company through the network, which requires the network to be weak in places where the indoor signal is weak. Communicate.
  • the scheme may be referred to as a Twin UE scheme, and the Twin UE includes two UEs (User Equipments, ie, terminals), one of which is a master terminal, which is called a DM-UE (D2D master UE, D2D master terminal; D2D: device- To-device, device to device), and the other is a slave terminal, called DS-UE (D2D slave UE, D2D slave terminal).
  • DM-UE Device Equipments
  • D2D master UE D2D master terminal
  • D2D device- To-device, device to device
  • DS-UE D2D slave UE, D2D slave terminal
  • Embodiments of the present invention provide an initial synchronization method and device between D2D terminals, which are used to implement Initial synchronization between D2D terminals.
  • an initial synchronization method between device-to-device D2D terminals comprising:
  • the D2D master terminal measures the time-frequency resource set for transmitting the synchronization signal, and reports the measurement result to the network device; the D2D master terminal receives the measurement result reported by the network device according to the D2D master terminal as the D2D master a synchronization resource allocated by the terminal; the D2D master terminal transmits a synchronization signal according to the synchronization resource allocated for the D2D master terminal.
  • the D2D master terminal performs measurement on a time-frequency resource set for transmitting a synchronization signal, including: the D2D master terminal is preset according to the D2D master terminal. The time-frequency resource set for transmitting the synchronization signal is measured; or the D2D master terminal acquires a time-frequency resource set for transmitting the synchronization signal from the broadcast message sent by the network device, and according to the acquired time-frequency The resource set is measured.
  • the D2D master terminal reports the measurement result to the network device after initiating network access and accessing the network; wherein, the D2D master terminal is In the network access process, the access reason and the type of the terminal are used for the measurement, and the terminal type is the D2D master terminal.
  • the synchronization resource includes a time-frequency resource for transmitting a synchronization signal;
  • the D2D terminal Receiving, by the D2D terminal, the time-frequency resource allocated by the network device for the D2D master terminal for transmitting a synchronization signal, when receiving the synchronization indication sent by the network device, Sending a synchronization signal at a time-frequency resource location of the synchronization signal; wherein, the synchronization finger
  • the indication is that the network device sends when the D2D slave terminal corresponding to the D2D terminal learns to access the network.
  • the synchronization resource further includes a time-frequency resource for transmitting synchronization feedback information
  • the method further includes: the D2D master The terminal receives the synchronization feedback information sent by the D2D slave terminal corresponding to the D2D master terminal according to the time-frequency resource used for transmitting the synchronization feedback information, and reduces the synchronization signal when the received synchronization feedback information is a power reduction indication Transmit power.
  • the D2D master terminal is receiving After the power reduction indication transmitted by all D2D slave terminals corresponding to the D2D master terminal, the transmission power of the synchronization signal is reduced.
  • a second aspect provides a device-to-device D2D terminal synchronization method, where the method includes: a step resource includes a time-frequency resource for transmitting a synchronization signal; and the D2D slave terminal obtains the synchronization according to the synchronization a time-frequency resource for transmitting a synchronization signal in the resource, receiving a synchronization signal sent by the D2D master terminal corresponding to the D2D slave terminal; and the D2D slave terminal according to the received synchronization signal and the D2D master corresponding to the D2D slave terminal The terminal synchronizes.
  • the D2D obtains the synchronization resource of the D2D master terminal corresponding to the D2D slave terminal from the terminal, including:
  • the D2D slave terminal performs a signal search according to a time-frequency resource set for transmitting a synchronization signal that is preset in the D2D slave terminal, and the terminal identifier carried in the searched signal is a D2D master corresponding to the D2D slave terminal.
  • the terminal identifier carried in the searched signal is a D2D master corresponding to the D2D slave terminal.
  • the time-frequency resource used by the currently searched signal is used.
  • the D2D receives, from the terminal, a synchronization resource of the D2D master terminal corresponding to the D2D slave terminal that is notified by the network device, where the synchronization resource is the network device according to the D2D slave terminal.
  • the measurement result reported by the D2D master terminal is allocated by the D2D master terminal, and the measurement result is a result of measuring a time-frequency resource set for transmitting the synchronization signal.
  • the D2D slave terminal receives the network device notification and the D2D after initiating network access and accessing the network a synchronization resource of the D2D master terminal corresponding to the terminal; wherein the D2D slave terminal reports the terminal type in the network access process, and the terminal type is a D2D slave terminal;
  • the method further includes: after receiving the synchronization resource of the D2D master terminal corresponding to the D2D slave terminal notified by the network device, the D2D initiates a release process of a link with the network device.
  • the synchronization resource further includes a time for transmitting synchronization feedback information Frequency resource
  • the method further includes:
  • the D2D slave terminal sends synchronization feedback information to the D2D master terminal corresponding to the D2D slave terminal according to the time-frequency resource for transmitting the synchronization feedback information.
  • the sending the synchronization feedback information to the D2D master terminal corresponding to the D2D slave terminal includes:
  • a method for initial synchronization between device-to-device D2D terminals comprising:
  • the network device receives the measurement result of the time-frequency resource set for transmitting the synchronization signal reported by the D2D primary terminal; And the network device allocates a synchronization resource to the D2D master terminal according to the measurement result; the network device notifies the D2D master terminal of the synchronization resource allocated by the D2D master terminal.
  • the method further includes: the network device notifying, to the D2D slave terminal corresponding to the D2D master terminal, a synchronization resource allocated by the D2D master terminal.
  • the method further includes: after the network device learns that the D2D slave terminal corresponding to the D2D master terminal accesses the network, notifying the D2D master terminal to send Synchronization signal.
  • the indication is The D2D master terminal stops transmitting the synchronization signal.
  • the synchronization resource includes: a time-frequency resource for transmitting a synchronization signal
  • the synchronization resource includes: a time-frequency resource for transmitting a synchronization signal
  • a device-to-device D2D terminal including:
  • a measurement module configured to measure a time-frequency resource set used for transmitting the synchronization signal, and report the measurement result of the measurement module to the network device;
  • a synchronization resource configuration module configured to receive a synchronization resource allocated by the network device to the D2D master terminal according to the measurement result measured and uploaded by the measurement module;
  • a synchronization signal transmission module configured to send a synchronization signal according to the synchronization resource allocated by the synchronization resource configuration module for the D2D master terminal.
  • the measuring module is specifically configured to: perform measurement according to a time-frequency resource set for transmitting a synchronization signal preset in the D2D main terminal; or The time-frequency resource set for transmitting the synchronization signal is obtained in the broadcast message sent by the network device, and the measurement is performed according to the acquired time-frequency resource set.
  • the measuring module is specifically configured to report the measurement result to the network device after initiating network access and accessing the network; wherein, the D2D The network access module of the terminal reports the access reason and the terminal type in the network access process, and the access reason is measurement reporting, and the terminal type is a D2D primary terminal.
  • the synchronization resource includes a time-frequency resource for transmitting a synchronization signal
  • the synchronization signal transmission module is specifically configured to: after the synchronization resource configuration module receives the time-frequency resource allocated by the network device for the D2D master terminal for transmitting the synchronization signal, immediately after the allocation for transmitting the synchronization signal Sending a synchronization signal at a time-frequency resource location; or, after receiving the time-frequency resource allocated by the network device for the D2D master terminal for transmitting a synchronization signal, when receiving the synchronization indication sent by the network device Transmitting a synchronization signal on the allocated time-frequency resource location for transmitting the synchronization signal, where the synchronization indication is sent by the network device when learning that the D2D slave terminal corresponding to the D2D terminal accesses the network .
  • the synchronization resource further includes a time-frequency resource for transmitting synchronization feedback information
  • the synchronization signal transmission module is further configured to: receive, according to the time-frequency resource for transmitting synchronization feedback information, synchronization feedback information sent by the D2D slave terminal corresponding to the D2D master terminal, and receive the synchronization feedback information To reduce the power indication, reduce the transmission power of the synchronization signal.
  • the synchronization signal transmission module is specifically configured to: the number of D2D slave terminals corresponding to the D2D master terminal is at least 2 In the case of the reduced power indication transmitted by all the D2D slave terminals corresponding to the D2D master terminal, the transmission power of the synchronization signal is reduced.
  • the fifth aspect provides a device-to-device D2D terminal, including: a resource, where the synchronization resource includes a time-frequency resource for transmitting a synchronization signal;
  • a synchronization signal transmission module configured to acquire the synchronization according to the synchronization resource configuration module a time-frequency resource for transmitting a synchronization signal in the resource, and receiving a synchronization signal sent by the D2D master terminal corresponding to the D2D slave terminal;
  • a synchronization module configured to synchronize with the D2D main terminal corresponding to the D2D slave terminal according to the received synchronization signal.
  • the synchronization resource configuration module is specifically configured to: perform signal search according to a time-frequency resource set for transmitting a synchronization signal that is preset in the D2D slave terminal, when When the terminal identifier carried in the searched signal is the identifier of the D2D master terminal corresponding to the D2D slave terminal, the time-frequency resource used by the currently searched signal is determined as the D2D master terminal corresponding to the D2D slave terminal.
  • the D2D master terminal is allocated by the D2D master terminal, and the measurement result is a result of measuring a time-frequency resource set used for transmitting the synchronization signal.
  • the synchronization resource configuration module is specifically configured to: after the D2D slave network initiates network access and accesses the network, Receiving, by the network device, the synchronization resource of the D2D master terminal that is corresponding to the D2D slave terminal, where the network access module of the D2D slave terminal reports the terminal type in the network access process, and the terminal type is D2D From the terminal;
  • the synchronization resource configuration module is further configured to: after receiving the synchronization resource of the D2D master terminal corresponding to the D2D slave terminal that is notified by the network device, instructing the network access module of the D2D terminal to initiate the network The release process of the link between devices.
  • the synchronization resource further includes a time for transmitting synchronization feedback information Frequency resource
  • the synchronization signal transmission module is further configured to send synchronization feedback information to the D2D master terminal corresponding to the D2D slave terminal according to the time-frequency resource used for transmitting the synchronization feedback information.
  • the synchronization signal transmission module is specifically configured to send, when the strength of the synchronization signal sent by the D2D master terminal corresponding to the D2D slave terminal exceeds a set threshold, to the D2D master terminal corresponding to the D2D slave terminal And reducing the power indication, the low power indication is used to instruct the D2D main terminal to reduce the synchronization signal transmission power; or, after the synchronization is completed according to the received synchronization signal and the D2D master terminal corresponding to the D2D slave terminal, to the D2D A synchronization confirmation indication is sent from the D2D master terminal corresponding to the terminal.
  • a network device including:
  • a receiving module configured to receive a measurement result of a time-frequency resource set for transmitting a synchronization signal reported by the D2D primary terminal;
  • a synchronization resource allocation module configured to allocate a synchronization resource to the D2D master terminal according to the measurement result received by the receiving module
  • the notification module is configured to notify the D2D master terminal of the synchronization resource allocated by the synchronization resource allocation module for the D2D master terminal.
  • the notification module is further configured to: notify a D2D slave terminal corresponding to the D2D master terminal to a synchronization resource allocated by the D2D master terminal.
  • the notification module is further configured to notify the D2D main terminal to send a synchronization signal after learning that the D2D slave terminal corresponding to the D2D master terminal accesses the network .
  • the notification module is further configured to: after receiving the D2D slave terminal corresponding to the D2D master terminal, notify the D2D slave terminal that the host has camped on the macro cell After the message, the D2D master terminal is instructed to stop transmitting the synchronization signal.
  • the synchronization resource includes: a time-frequency resource for transmitting a synchronization signal
  • the D2D master terminal performs a measurement on the time-frequency resource set for transmitting the synchronization signal to the network device, so that the network device allocates the synchronization resource to the D2D master terminal according to the measurement result. Thereby transmitting a synchronization signal on the synchronization resource to implement Initial synchronization between D2D terminals.
  • the seventh aspect provides a device-to-device D2D terminal, including a transceiver and a processor, where the processor is configured to measure, by using the transceiver, a time-frequency resource set for transmitting a synchronization signal, and to the network The device reports the measurement result of the measurement module;
  • the processor is specifically configured to: according to a time-frequency resource set for transmitting a synchronization signal preset in the D2D main terminal, and pass the transceiver Performing measurement; or obtaining, by the transceiver, a time-frequency resource set for transmitting a synchronization signal from a broadcast message sent by the network device, and performing measurement according to the acquired time-frequency resource set and by using the transceiver .
  • the processor is specifically configured to report the measurement result to the network device by using the transceiver after initiating network access and accessing the network;
  • the network access module of the D2D terminal reports the access reason and the terminal type in the network access process, where the access reason is that the terminal type is a D2D master terminal.
  • the synchronization resource includes a time-frequency resource for transmitting a synchronization signal
  • the processor is specifically configured to: after the synchronization resource configuration module receives the time-frequency resource allocated by the network device for the D2D master terminal for transmitting a synchronization signal, immediately after the transceiver is configured by the transceiver Transmitting a synchronization signal at a time-frequency resource location for transmitting a synchronization signal; or, after receiving, by the transceiver, the time-frequency resource allocated by the network device for the D2D master terminal for transmitting a synchronization signal,
  • the transceiver receives the synchronization indication sent by the network device, the transceiver sends a synchronization signal at the time-frequency resource location for transmitting the synchronization signal by using the transceiver; wherein the synchronization indication is
  • the network device learns to correspond to the D2D terminal The D2D is sent when the terminal accesses the network.
  • the synchronization resource further includes a time-frequency resource for transmitting synchronization feedback information
  • the processor is further configured to: according to the time-frequency resource for transmitting synchronization feedback information, receive, by the transceiver, synchronization feedback information sent by the D2D slave terminal corresponding to the D2D master terminal, and when received The synchronization feedback information reduces the transmission power of the synchronization signal of the transceiver when the power indication is lowered.
  • the processor is specifically configured to: the number of D2D slave terminals corresponding to the D2D master terminal is at least two In the case, after receiving the reduced power indication transmitted by all the D2D slave terminals corresponding to the D2D master terminal through the transceiver, the transmission power of the synchronization signal of the transceiver is reduced.
  • the eighth aspect provides a device-to-device D2D terminal, including a transceiver and a processor, where the processor is configured to acquire, by using the transceiver, a synchronization resource of a D2D master terminal corresponding to the D2D slave terminal, where
  • the synchronization resource includes a time-frequency resource for transmitting a synchronization signal;
  • the processor is specifically configured to, by using the transceiver, perform, according to a time-frequency resource set that is preset to the D2D slave terminal for transmitting a synchronization signal.
  • the signal search when the terminal identifier carried in the searched signal is the identifier of the D2D master terminal corresponding to the D2D slave terminal, determining the time-frequency resource used by the currently searched signal to correspond to the D2D slave terminal
  • the D2D master terminal is configured to transmit a time-frequency resource of the synchronization signal; or, the transceiver receives, by the transceiver, a synchronization resource of the D2D master terminal corresponding to the D2D slave terminal that is notified by the network device, where the synchronization resource is the network device
  • the measurement result is allocated to the D2D master terminal according to the measurement result reported by the D2D master terminal corresponding to the D2D slave terminal, and the measurement result is a result of measuring a time-frequency resource set used for transmitting the synchronization signal.
  • the processor is specifically configured to: after the D2D initiates network access and accesses the network, the transceiver receives, by using the transceiver, a synchronization resource of the D2D master terminal that is notified by the network device and corresponding to the D2D slave terminal.
  • the network access module of the D2D slave terminal reports the terminal type in the network access process, and the terminal type is a D2D slave terminal;
  • the processor is further configured to, after receiving, by the transceiver, the synchronization resource of the D2D master terminal that is corresponding to the D2D slave terminal that is notified by the network device, instructing the network access module of the D2D terminal to initiate The release process of the link between the network devices.
  • the synchronization resource further includes a time for transmitting synchronization feedback information Frequency resource
  • the processor is further configured to send synchronization feedback information to the D2D master terminal corresponding to the D2D slave terminal by using the transceiver according to the time-frequency resource for transmitting synchronization feedback information.
  • the processor is specifically configured to: receive, by the transceiver, a D2D master corresponding to the D2D slave terminal When the strength of the synchronization signal sent by the terminal exceeds a set threshold, the reduced power indication is sent to the D2D master terminal corresponding to the D2D slave terminal, where the power reduction indication is used to instruct the D2D master terminal to reduce the synchronization signal transmission power; or After the synchronization signal received by the transceiver is synchronized with the D2D master terminal corresponding to the D2D slave terminal, the synchronization confirmation indication is sent by the transceiver to the D2D master terminal corresponding to the D2D slave terminal.
  • a network device including a transceiver and a processor
  • the transceiver is configured to receive a measurement result of a time-frequency resource set for transmitting a synchronization signal reported by the D2D primary terminal;
  • the processor is configured to allocate, according to the measurement result received by the transceiver, a synchronization resource to the D2D master terminal, and allocate, by using the transceiver, the synchronization resource allocation module to the D2D master terminal.
  • the synchronization resource is notified to the D2D master terminal.
  • the processor is specifically configured to: notify, by the transceiver, a synchronization resource allocated to the D2D master terminal to the D2D master terminal pair Should be D2D slave terminal.
  • the processor is further configured to notify the D2D by using the transceiver after learning that the D2D slave terminal corresponding to the D2D master terminal accesses the network
  • the master terminal transmits a synchronization signal.
  • the processor is further configured to: send, by the transceiver, a D2D corresponding to the D2D main terminal by using the transceiver, for sending a notification After the D2D slave station has camped on the macro cell message, the D2D master terminal is instructed by the transceiver to stop transmitting the synchronization signal.
  • the synchronization resource includes: a time-frequency resource for transmitting a synchronization signal
  • the synchronization resource includes: a time-frequency resource for transmitting a synchronization signal
  • the D2D master terminal reports the result of measuring the time-frequency resource set for transmitting the synchronization signal to the network device, so that the network device allocates the synchronization resource to the D2D master terminal according to the measurement result, thereby A synchronization signal is transmitted on the synchronization resource to implement initial synchronization between the D2D terminals.
  • FIG. 1 is a schematic diagram of communication between a DM-UE and a DS-UE in the prior art
  • FIG. 2 is a schematic flowchart of processing on a DM-UE side according to an embodiment of the present invention
  • FIG. 3 is a schematic flowchart of processing on a DS-UE side according to an embodiment of the present disclosure
  • FIG. 4 is a schematic flowchart of processing on the e B side according to an embodiment of the present invention.
  • FIG. 5 is a schematic flowchart of a specific application scenario according to an embodiment of the present disclosure
  • 6A and FIG. 6B are respectively schematic diagrams showing the structure of a D2D master terminal according to an embodiment of the present invention
  • FIG. 7A and FIG. 7B are respectively schematic diagrams showing the structure of a D2D slave terminal according to an embodiment of the present invention
  • FIG. 8A and FIG. A schematic diagram of the structure of a network device provided by the example. detailed description
  • the embodiment of the present invention provides an initial synchronization scheme between D2D terminals, which can enable the DM-UE and the DS-UE to acquire synchronization resources, thereby performing synchronization between the DM-UE and the DS-UE. Further, the DM-UE may further adjust the synchronization signal transmission power according to the synchronization feedback information sent by the DS-UE, so as to save terminal overhead and reduce or avoid the other 020 pairs (ie, Twin UE). .
  • the DM-UE is located in a network signal coverage area.
  • a UE located in a network signal coverage area may be configured as a DM-UE.
  • the DM-UE may measure the time-frequency resource set used for transmitting the synchronization signal and report the measurement result to the network device, and the network device allocates a synchronization resource to the DM-UE according to the measurement result, and the synchronization resource
  • the time-frequency resource for transmitting the synchronization signal may be included (the synchronization signal in the embodiment of the present invention refers to the synchronization signal between the DM-UE and the DS-UE), and may further include a time frequency for transmitting the synchronization feedback information.
  • the DM-UE sends a synchronization signal on a time-frequency resource allocated by the network device for the DM-UE to transmit a synchronization signal, if the network device further allocates a time-frequency for transmitting the synchronization feedback information to the DM-UE.
  • the DM-UE receives the synchronization feedback information sent by the DS-UE corresponding to the DM-UE on the time-frequency resource for transmitting the synchronization feedback information, and adjusts the synchronization signal according to the received synchronization feedback information. Transmit power.
  • the DS-UE may be first placed in the coverage of the network signal, so that the DS-UE can obtain the DS-UE from the network device, in consideration of the DS-UE installation location.
  • the synchronization resource may include a time-frequency resource for transmitting a synchronization signal, and further may further include a time-frequency resource for transmitting synchronization feedback information; and the DS-UE may receive the time-frequency resource for transmitting the synchronization signal.
  • the synchronization feedback information may also be transmitted on the time-frequency resource for transmitting the synchronization feedback information.
  • the DS-UE can also obtain the synchronization resource of the DM-UE corresponding to the DS-UE by means of signal search.
  • the network device is mainly responsible for allocating synchronization resources (including time-frequency resources for transmitting synchronization signals, and time-frequency resources for transmitting synchronization feedback information) for the DM-UE, and notifying the allocated synchronization resources.
  • the network device may also control the synchronization process of the DM-UE and the DS-UE, for example, instructing the DM-UE to start transmitting the synchronization signal and/or instructing the DM-UE to stop transmitting the synchronization signal.
  • FIG. 2 is a schematic diagram of a process flow of a DM-UE side according to an embodiment of the present invention. As shown in the figure, the process may include:
  • Step 201 The DM-UE performs measurement on a time-frequency resource set used for transmitting the synchronization signal.
  • the DM-UE may perform measurement of the time-frequency resource set in any of the following two ways:
  • the DM-UE performs measurement according to a time-frequency resource set for transmitting a synchronization signal preset in the DM-UE.
  • the synchronization resource set may be set in advance in the DM-UE, where at least the time-frequency resource set for transmitting the synchronization signal is included, for example, the synchronization resource set is specified by a protocol.
  • the time-frequency resource in the time-frequency resource set for transmitting the synchronization signal is an uplink time-frequency resource, and the uplink time-frequency resource may include, but is not limited to, an RB (Radio Bearer) resource and a symbol.
  • Table 1 shows the form of a time-frequency resource set.
  • the synchronization resource set may further include a time-frequency resource set for transmitting the synchronization feedback information
  • the time-frequency resource in the time-frequency resource set for transmitting the synchronization signal feedback information is an uplink time-frequency resource
  • the uplink time-frequency resource may include
  • it is not limited to RB resources and symbols, and there is a one-to-one correspondence between time-frequency resources for transmitting synchronization feedback information and time-frequency resources for transmitting synchronization signals.
  • Table 2 shows the form of a time-frequency resource set:
  • the DM-UE receives a signal on each time-frequency resource for transmitting the synchronization signal in the synchronization resource set to detect the signal strength on each time-frequency resource in the time-frequency resource set.
  • the DM-UE obtains a synchronization resource set from a broadcast message sent by the network device, where at least the time-frequency resource set for transmitting the synchronization signal is included, and further includes a time-frequency resource set for transmitting synchronization feedback information, and the DM The UE performs measurement according to the acquired time-frequency resource set for transmitting the synchronization signal.
  • the network device may send the synchronization resource set by using a broadcast message, for example, the information element may be added to the broadcast message to indicate the synchronization resource set.
  • the contents of the synchronization resource set are as described above.
  • the DM-UE After receiving the broadcast message, the DM-UE obtains a time-frequency resource set for transmitting a synchronization signal from the broadcast message, and receives a signal on each time-frequency resource in the time-frequency resource set to detect the time-frequency resource concentration. The signal strength on each time-frequency resource.
  • Step 202 The DM-UE reports the measurement result to the network device.
  • the DM-UE may report the measurement result to the network device after initiating a network access process (such as a random access procedure) and accessing the network.
  • the measurement result is the signal strength on each time-frequency resource of the time-frequency resource set used by the DM-UE for transmitting the synchronization signal.
  • the DM-UE may indicate that the access reason is the reported measurement result, and may further indicate the type of the DM-UE when reporting the terminal capability information, in the access reason carried by the sent random access request message. That is, the DM-UE is indicated as a D2D master terminal.
  • Step 203 The DM-UE receives a synchronization resource allocated by the network device to the DM-UE according to the measurement result reported by the DM-UE, where the synchronization resource may include a time-frequency resource for transmitting a synchronization signal, and further Includes time-frequency resources for transmitting synchronization feedback information.
  • the network device when the network device allocates time-frequency resources for transmitting the synchronization signal only for the DM-UE, the network device may select, according to the signal strength of each time-frequency resource in the time-frequency resource set reported by the DM-UE, The time-frequency resource with a small signal strength is used as the time-frequency resource of the DM-UE for transmitting the synchronization signal, and the time-frequency resource allocated for the DM-UE for transmitting the synchronization signal is notified to the DM-UE.
  • the synchronization resource set as shown in Table 2 may be preset on the network device, and the network device According to the signal strength of each time-frequency resource in the time-frequency resource set by the DM-UE, the "time-frequency resource for transmitting the synchronization signal" in which the signal strength is the smallest is selected, and the corresponding "use” is obtained through the query table 2. And transmitting the time-frequency resource of the synchronization feedback information, and allocating the "time-frequency resource for transmitting the synchronization signal" and "time-frequency resource for transmitting the synchronization feedback information" to the DM-UE.
  • the parameter of the synchronization resource may be sent to the DM-UE, or only the resource sequence number of the synchronization resource may be sent to the DM-UE to reduce network overhead.
  • the DM-UE After receiving the resource sequence number, the DM-UE can obtain the corresponding synchronization resource by querying the local synchronization resource set.
  • the network device selects the time-frequency resource used for transmitting the synchronization signal according to the signal strength on each time-frequency resource in the time-frequency resource set reported by the DM-UE, and may select the time when the signal strength is the smallest. Frequency resources, to minimize or avoid interference of the synchronization signal sent by the DM-UE to other Twin UEs.
  • Steps 204-205 The DM-UE sends a synchronization signal according to the synchronization resource allocated for the DM-UE. Further, in the case that the synchronization resource further includes a time-frequency resource for transmitting the synchronization feedback information, the DM-UE receives the DS-UE transmission corresponding to the DM-UE according to the time-frequency resource used for transmitting the synchronization feedback information. Synchronous feedback information.
  • the DM-UE may immediately send a synchronization signal on the synchronization resource, and may further receive synchronization feedback information according to the synchronization resource (in the DM) - the UE allocates a time-frequency resource for transmitting synchronization feedback information); the DM-UE may also send a synchronization signal according to the synchronization resource after receiving the synchronization indication sent by the network device, and may further further base the synchronization resource according to the synchronization resource Receiving synchronization feedback information (in the case where the DM-UE is allocated time-frequency resources for transmitting synchronization feedback information).
  • the synchronization feedback information may be synchronization confirmation information or power adjustment indication information. If the DM-UE receives the synchronization confirmation information, the DM-UE may confirm that the synchronization with the DS-UE that sent the synchronization confirmation information is completed according to the synchronization confirmation information, and may further stop transmitting the synchronization signal; if the DM-UE receives The power adjustment indication information is used, and the DM-UE adjusts the transmission power of the synchronization signal.
  • the DM-UE sends the synchronization signal at the maximum fixed power before the DM-UE receives the power adjustment indication information, and the DM-UE reduces the synchronization signal transmission power after receiving the power reduction indication information. Further, if the DM-UE receives the indication of increasing the power, the synchronization signal transmission power is increased.
  • one DM-UE may correspond to multiple DS-UEs.
  • the DM-UE receives the power adjustment indication (such as the power reduction indication) sent by all the corresponding DS-UEs, The synchronization signal transmission power is reduced; when the DM-UE receives the synchronization confirmation indication sent by all its corresponding DS-UEs, the synchronization signal is stopped.
  • the power adjustment indication such as the power reduction indication
  • the DM-UE may be authenticated by the core network device in the random access process of the DM-UE on the basis of the foregoing process.
  • the core network equipment After the right is passed, the network device (such as a base station) is successfully authenticated, and the network device is aware of the
  • the DM-UE After the DM-UE is successfully authenticated, the DM-UE is allocated a synchronization resource, and the synchronization resource allocated for the DM-UE is notified to the DM-UE.
  • the DM-UE reports the result of measuring the time-frequency resource set for transmitting the synchronization signal to the network device, so that the network device allocates the synchronization resource to the DM-UE according to the measurement result, thereby A synchronization signal is transmitted on the synchronization resource to implement initial synchronization between the D2D terminals.
  • FIG. 3 is a schematic diagram of a processing flow of a DS-UE side according to an embodiment of the present invention. As shown in the figure, the process may include:
  • Step 301 The DS-UE acquires a synchronization resource of the DM-UE corresponding to the DS-UE.
  • the DS-UE may obtain the synchronization resource of the DM-UE corresponding to the DS-UE in any of the following two manners:
  • the DS-UE determines the synchronization resource of the DM-UE corresponding to the DS-UE by performing a signal search on the preset time-frequency resource set for transmitting the synchronization signal.
  • the DM-UE sends a broadcast message
  • the ID of the DM-UE is included in the message
  • the ID of the DM-UE corresponding to the DS-UE is preset in the DS-UE (usually preset at the factory).
  • the synchronization resource set is also preset in the DS-UE, where at least the time-frequency resource set for transmitting the synchronization signal is included, and the content of the time-frequency resource set is the same as described above.
  • the synchronization resource set may further include a time-frequency resource set for transmitting synchronization feedback information, and “the time-frequency resource for transmitting the synchronization feedback information” has a one-to-one correspondence with the “time-frequency resource for transmitting the synchronization signal”. Relationship. The contents of the synchronization resource set are as described above.
  • the DS-UE performs a signal search according to a time-frequency resource set for transmitting a synchronization signal that is preset in the DS-UE, and when the terminal identifier carried in the searched signal is the identifier of the DM-UE corresponding to the DS-UE, And determining, by using the time-frequency resource used by the currently searched signal, a time-frequency resource used by the DM-UE corresponding to the DS-UE to transmit the synchronization signal. Further, the corresponding “time-frequency resource for transmitting synchronization feedback information” may be queried according to the determined DM-UE “time-frequency resource for transmitting synchronization signal”. Manner 2: The DS-UE receives the time-frequency resource that the DM-UE corresponding to the DS-UE that is notified by the network device is used to transmit the synchronization signal.
  • the network device records the DM-UE after the synchronization resource is allocated in the manner of step 203 in FIG. 2, and when the network device learns that the DS-UE corresponding to the DM-UE accesses the network, the DM-UE The assigned synchronization resource is notified to the DS-UE of the access network.
  • Step 302 The DS-UE receives a synchronization signal sent by the DM-UE corresponding to the DS-UE according to the time-frequency resource used for transmitting the synchronization signal in the acquired synchronization resource, and according to the received synchronization signal, The DM-UE corresponding to the DS-UE is synchronized.
  • Step 303 Further, when the synchronization resource further includes a time-frequency resource for transmitting synchronization feedback information, the DS-UE further sends the synchronization feedback information at the time-frequency resource location for transmitting the synchronization feedback information.
  • the DS-UE if the strength of the synchronization signal sent by the DM-UE corresponding to the DS-UE exceeds a set threshold, the DS-UE sends a power adjustment indication to the DM-UE, so that the DM-UE adjusts the synchronization according to the indication. Signal transmission power; otherwise, after the synchronization is successful, a synchronization confirmation indication is sent to the DM-UE, so that the DM-UE stops transmitting the synchronization signal.
  • the DS-UE obtains the synchronization resource of the DM-UE corresponding to the DS-UE, and then receives the synchronization signal sent by the DM-UE according to the synchronization resource, so as to implement initial synchronization between the D2D terminals.
  • FIG. 4 is a schematic diagram of a process flow on the network side according to an embodiment of the present invention. As shown in the figure, the process may include:
  • Step 401 The network device receives the measurement result of the time-frequency resource set for transmitting the synchronization signal reported by the DM-UE.
  • the specific implementation of the measurement and reporting of the measurement result by the DM-UE according to the synchronization resource set, as described above, will not be described in detail herein.
  • Step 402 The network device allocates a synchronization resource to the DM-UE according to the measurement result.
  • the synchronization resource allocated by the network device to the DM-UE may include a time-frequency resource for transmitting the synchronization signal, and may also include a time-frequency resource for transmitting the synchronization feedback information, and the specific implementation manner is as described above. , will not be detailed here.
  • Step 403 The network device notifies the DM-UE of the synchronization resource allocated by the DM-UE, and the specific implementation manner is the same as that described above, and is not described in detail herein.
  • process may further include the following steps:
  • Step 404 After the network device learns that the DS-UE corresponding to the DM-UE accesses the network, the network device notifies the DS-UE of the synchronization resource allocated for the DM-UE.
  • process may further include the following steps:
  • Step 405 After the network device learns that the DS-UE corresponding to the DM-UE accesses the network, the network device is notified to send the synchronization signal.
  • the network device After receiving the message sent by the DS-UE corresponding to the DM-UE to notify the DS-UE that the DS-UE has camped on the macro cell, the network device instructs the DM-UE to stop sending the synchronization signal.
  • the network device allocates a synchronization resource to the DM-UE according to the measurement result of the time-frequency resource set for transmitting the synchronization signal reported by the DM-UE, and notifies the DM-UE of the allocated synchronization resource.
  • the DS-UE corresponding to the DM-UE may be further notified, so that the DM-UE sends a synchronization signal according to the synchronization resource, so that the DS-UE receives the synchronization signal according to the synchronization resource, thereby implementing initial synchronization between the D2D terminals.
  • the DS-UE may further send the synchronization feedback information according to the time-frequency resource used for transmitting the synchronization feedback information in the synchronization resource, and the DM-UE receives the synchronization feedback information according to the time-frequency resource used to transmit the synchronization feedback information in the synchronization resource. Therefore, the transmission power of the synchronization signal is adjusted according to the synchronization feedback information to save terminal consumption and reduce or avoid interference with other D2D pairs (ie, Twin UE).
  • the network device described in the above process may be a base station.
  • the mapping relationship between the DM-UE and the ID of the DS-UE is pre-stored in the DM-UE and the DS-UE (can be configured when the UE is shipped from the factory), and the operator also saves the mapping relationship information in the core network.
  • the functional entity on the core network side may be an MME (Mobility Management Entity), or may be a functional entity newly set in the embodiment of the present invention, such as a Twin-UE Server (related user server). .
  • MME Mobility Management Entity
  • Twin-UE Server related user server
  • the DM-UE and the DS-UE (hereinafter referred to as DS-UE) corresponding to the DM-UE are placed in a location where the network has coverage.
  • the network broadcasts a time-frequency resource set for transmitting the synchronization signal.
  • the DM-UE measures the broadcast time-frequency resource set to obtain a signal of each time-frequency resource in the time-frequency resource set. strength.
  • the DM-UE initiates a random access procedure, in which the DM-UE indicates, in the reason of the access request, that the measurement result of the time-frequency resource set for transmitting the synchronization signal is reported, and is reported.
  • the UE indicates its type when it is capable.
  • the core network device performs network authentication on the DM-UE, and the DM-UE accesses the network after the authentication is passed.
  • the signal strength of each time-frequency resource in the time-frequency resource set for transmitting the synchronization signal is reported; in step 505, the base station is the DM-UE according to the reported measurement result.
  • a synchronization resource is allocated, where the synchronization resource includes a time-frequency resource for transmitting a synchronization signal, and a time-frequency resource for transmitting synchronization feedback information.
  • the DS-UE initiates a random access procedure to access the network, and indicates its type when reporting the UE capability.
  • the core network device authenticates the DS-UE, and after the authentication is passed, in step 507, the core network device finds the DS-UE according to the mapping relationship information between the DM-UE and the ID of the DS-UE stored by the core network device. Corresponding DM-UE, and notifying the ID of the found DM-UE to the base station; in step 508, the base station notifying the DS-UE of the synchronization resource of the DM-UE, and in the following step 509, The DS-UE initiates a release procedure of the link with the base station.
  • the core network device notifies the DS-UE that there is no DM-UE corresponding thereto, and the DS-UE initiates a link with the base station according to the notification. Release process.
  • step 510 after the base station finds that the DS-UE accesses the network, it notifies the DM-UE to send a synchronization signal on the allocated time-frequency resource location for transmitting the synchronization signal, and is used to receive the synchronization feedback.
  • the synchronous feedback information is received on the time-frequency resource of the information.
  • the DS-UE After that, the DS-UE is placed in the actual installation location (the DS-UE has no network coverage required).
  • the DS-UE first attempts to search for the macro network. If it can reside in the macro network, it accesses the macro network and informs the network side (such as the core network device and/or the base station) that the DS-UE resides in the macro network (for example, The signaling mode informs that the content of the signaling message can be expressed as follows: "The DS-UE already resides in the macro network,". In the case that one DM-UE corresponds to one DS-UE, after receiving the indication, the network side receives the indication.
  • the DM-UE is notified not to send the synchronization signal and the detection of the synchronization feedback signal (for example, can be notified by signaling, the content of the signaling message can be expressed as follows) "DM-UE stops transmitting synchronization signal and detecting synchronization feedback signal" If the DM-UE needs to support multiple DS-UEs, the network side notifies the DM after all the DS-UEs corresponding to the DM-UE send the notification to the network to send the resident macro network. - The UE does not need to transmit the synchronization signal and the detection of the synchronization feedback signal.
  • step 511 after the DS-UE cannot search for the macro network for a period of time (the length of time can be broadcasted in the system broadcast message, defined in the standard or customized by each manufacturer), the DS-UE starts to follow the obtained synchronization resource.
  • a time-frequency resource for transmitting the synchronization signal receives the synchronization signal of the DM-UE, and synchronizes with the DM-UE according to the received synchronization signal, and the DS-UE compares the strength of the received synchronization signal with a preset threshold.
  • the synchronization confirmation information is fed back on the corresponding time-frequency resource according to the obtained synchronization resource (time-frequency resource for transmitting synchronization feedback information); if the synchronization signal strength is higher than the threshold, then In step 512, an adjustment indication for reducing the transmission power of the synchronization signal is issued (the adjustment adjustment indication may be a relative value or an absolute value). After the DS-UE and the DM-UE are successfully synchronized, the DS-UE sends a synchronization confirmation message.
  • step 513 after receiving the adjustment indication for reducing the transmission power of the synchronization signal, the DM-UE reduces the transmission power of the synchronization signal until the DM-UE receives the synchronization confirmation information, the initial synchronization ends, and the DM-UE stops transmitting the synchronization signal.
  • an embodiment of the present invention further provides a D2D terminal device and a network device. Since the principle of solving the problem of these devices is similar to the method flow described in the foregoing embodiment, the implementation of these devices can be referred to the implementation of the method, and the repeated description is not repeated.
  • FIG. 6A is a schematic diagram showing the logical function structure of a D2D terminal according to an embodiment of the present invention.
  • the D2D terminal is a D2D primary terminal (DM-UE).
  • the D2D terminal may include: a measurement module 601, a synchronization resource configuration module 602, and a synchronization signal transmission module 603.
  • the D2D terminal further includes a network access module (not shown in the figure).
  • the main functions of the above functional modules of the D2D terminal may include:
  • the measuring module 601 is configured to measure a time-frequency resource set used for transmitting the synchronization signal, and report the measurement result of the measurement module to the network device;
  • the synchronization resource configuration module 602 is configured to receive a synchronization resource allocated by the network device according to the measurement result measured and reported by the measurement module 601 for the D2D master terminal;
  • the synchronization signal transmission module 603 is configured to send a synchronization signal according to the synchronization resource allocated by the synchronization resource configuration module 602 for the D2D master terminal.
  • the measurement module 601 may perform measurement according to a time-frequency resource set for transmitting a synchronization signal preset in the D2D main terminal; or acquire from a broadcast message sent by the network device.
  • the time-frequency resource set of the synchronization signal is transmitted, and the measurement is performed according to the acquired time-frequency resource set.
  • the measurement module 601 may report the measurement result to the network device after initiating network access and accessing the network; where the network access module of the D2D terminal is in network access.
  • the access reason and the terminal type are reported in the process, and the access reason is measurement reporting, and the terminal type is a D2D primary terminal.
  • the synchronization resource includes a time-frequency resource for transmitting a synchronization signal.
  • the synchronization signal transmission module 603 can immediately transmit the synchronization signal in the allocated time after the synchronization resource configuration module 602 receives the time-frequency resource allocated by the network device for the D2D master terminal for transmitting the synchronization signal.
  • the synchronization resource further includes a time-frequency resource for transmitting synchronization feedback information.
  • the synchronization signal transmission module 603 can receive the synchronization feedback information sent by the D2D slave terminal corresponding to the D2D master terminal according to the time-frequency resource used for transmitting the synchronization feedback information, and when the received synchronization feedback information is When the power indication is lowered, the transmission power of the synchronization signal is lowered.
  • the synchronization signal transmission module 603 can receive all D2Ds corresponding to the D2D master terminal in a case where the number of D2D slave terminals corresponding to the D2D master terminal is at least two. After the power reduction indication sent from the terminal, the transmission power of the synchronization signal is reduced.
  • FIG. 6B is a schematic structural diagram of hardware of a D2D terminal configured as a D2D primary terminal (DM-UE) according to an embodiment of the present invention.
  • the D2D terminal can include: a transceiver 61, a processor 62, and further a memory 63.
  • the processor 62 has a measurement function 621, a synchronization resource configuration function 622, and a synchronization signal transmission function 623, each of the above functions.
  • the processor 62 has a measurement function 621, a synchronization resource configuration function 622, and a synchronization signal transmission function 623, each of the above functions.
  • FIG. 6A For the specific implementation process, reference may be made to the corresponding functional modules in FIG. 6A.
  • each component of the D2D master terminal includes:
  • the processor 62 is configured to measure, by using the transceiver 61, a time-frequency resource set for transmitting a synchronization signal, and report the measurement result of the measurement module to the network device; receive, by the transceiver 61, the network device according to the measurement The result is a synchronization resource allocated by the D2D master terminal; and, according to the synchronization resource allocated for the D2D master terminal, and transmitting a synchronization signal through the transceiver 61.
  • the processor 62 may perform measurement according to a time-frequency resource set for transmitting a synchronization signal preset in the D2D main terminal, and perform measurement by the transceiver 61; or
  • the time-frequency resource set for transmitting the synchronization signal is obtained in the broadcast message sent by the network device, and is measured by the transceiver 61 according to the acquired time-frequency resource set.
  • the processor 62 may report the measurement threshold to the network device by using the transceiver 61 after initiating the network access and accessing the network.
  • the network access of the D2D terminal is The module reports the access reason and the terminal type in the network access process, and the access reason is the measurement report, and the terminal type is a D2D master terminal.
  • the synchronization resource includes a time-frequency resource for transmitting a synchronization signal.
  • the processor 62 can use the transceiver 61 to transmit the synchronization signal through the transceiver 61 immediately after receiving the time-frequency resource allocated by the network device for the D2D master terminal for transmitting the synchronization signal.
  • the synchronization signal is sent by the transceiver 61 at the allocated time-frequency resource location for transmitting the synchronization signal; wherein, the synchronization refers to The indication is that the network device sends when the D2D slave terminal corresponding to the D2D terminal learns to access the network.
  • the synchronization resource further includes a time-frequency resource for transmitting synchronization feedback information.
  • the processor 61 may further receive the synchronization feedback information sent by the D2D slave terminal corresponding to the D2D master terminal through the transceiver 61 according to the time-frequency resource for transmitting the synchronization feedback information, and when receiving the synchronization The feedback information is to reduce the transmission power of the synchronization signal of the transceiver 61 when the power indication is lowered.
  • the processor 62 may receive, by using the transceiver 61, a corresponding to the D2D master terminal, when the number of D2D slave terminals corresponding to the D2D master terminal is at least two. After all the D2Ds transmit the power reduction indication from the terminal, the transmission power of the synchronization signal of the transceiver 61 is lowered.
  • FIG. 7A is a schematic structural diagram of a D2D terminal according to another embodiment of the present invention, where the D2D terminal is a D2D slave terminal (DS-UE).
  • the D2D terminal may include: a main function of the foregoing function module of the D2D terminal, which may include: a synchronization resource configuration module 701, a synchronization signal transmission module 702, and a synchronization module 703, where the D2D terminal further includes a network access module. (not shown in the figure).
  • the main functions of each functional module of the D2D terminal may include:
  • the synchronization resource configuration module 701 is configured to acquire a synchronization resource of the D2D master terminal corresponding to the D2D slave terminal, where the synchronization resource includes a time-frequency resource for transmitting a synchronization signal.
  • the synchronization signal transmission module 702 is configured to receive, according to the time-frequency resource used for transmitting the synchronization signal in the synchronization resource acquired by the synchronization resource configuration module 701, the synchronization signal sent by the D2D master terminal corresponding to the D2D slave terminal;
  • the synchronization module 703 is configured to synchronize with the D2D master terminal corresponding to the D2D slave terminal according to the received synchronization signal.
  • the synchronization resource configuration module 701 may perform a signal search according to a time-frequency resource set for transmitting a synchronization signal that is preset in the D2D slave terminal, and the terminal identifier carried in the searched signal.
  • a time-frequency resource for transmitting a synchronization signal When the ID of the D2D master terminal corresponding to the D2D slave terminal is current, a time-frequency resource for transmitting a synchronization signal; or, receiving, by the network device, a synchronization resource of the D2D master terminal corresponding to the D2D slave terminal, where the synchronization resource is according to the network device according to the D2D slave terminal
  • the measurement result reported by the D2D master terminal is allocated by the D2D master terminal, and the measurement result is a result of measuring a time-frequency resource set for transmitting the synchronization signal.
  • the synchronization resource configuration module 701 may receive, after the D2D slave network initiates network access and access the network, the D2D master terminal that is notified by the network device and corresponds to the D2D slave terminal. a synchronization resource; wherein the D2D slave network access module reports the terminal type in the network access process, the terminal type is a D2D slave terminal; the synchronization resource configuration module 701 can also receive the network device notification After the synchronization resource of the D2D master terminal corresponding to the D2D slave terminal, the network access module of the D2D terminal is instructed to initiate a release process of the link with the network device.
  • the synchronization resource further includes a time-frequency resource for transmitting synchronization feedback information.
  • the synchronization signal transmission module 702 can also be used to transmit synchronization information according to the method.
  • the synchronization signal transmission module 702 may correspond to the D2D slave terminal when the received strength of the synchronization signal sent by the D2D master terminal corresponding to the D2D slave terminal exceeds a set threshold.
  • the D2D master terminal sends a power reduction indication, where the power reduction indication is used to instruct the D2D master terminal to reduce the synchronization signal transmission power; or, after the synchronization is completed according to the received synchronization signal and the D2D master terminal corresponding to the D2D slave terminal, A synchronization confirmation indication is transmitted to the D2D master terminal corresponding to the D2D slave terminal.
  • FIG. 7B is a schematic structural diagram of hardware of a D2D terminal configured as a D2D slave terminal (DS-UE) according to an embodiment of the present invention.
  • the D2D terminal can include: a transceiver 71, a processor 72, and can further include a memory 73.
  • the processor 72 can implement a synchronization resource configuration function 721, a synchronization signal transmission function 722, and a synchronization function 723.
  • a synchronization resource configuration function 721 a synchronization signal transmission function 722
  • a synchronization function 723 a synchronization signal transmission function
  • the processor 72 is configured to acquire, by using the transceiver 71, a synchronization resource of the D2D master terminal corresponding to the D2D slave terminal, where the synchronization resource includes a time-frequency resource for transmitting a synchronization signal; The time-frequency resource for transmitting the synchronization signal in the synchronization resource, receiving, by the transceiver 71, the synchronization signal sent by the D2D master terminal corresponding to the D2D slave terminal; and, according to the received synchronization signal, in a possible
  • the processor 72 may perform a signal search according to a time-frequency resource set for transmitting a synchronization signal that is preset in the D2D slave terminal, by using the transceiver 71, where the terminal identifier carried in the searched signal is When the D2D is identified by the D2D master terminal corresponding to the terminal, the time-frequency resource used by the currently searched signal is determined as a time-frequency resource used by the D2D master terminal corresponding to the D2D slave
  • the processor 72 may receive, by the transceiver 71, the D2D master corresponding to the D2D slave terminal that is notified by the network device after the D2D slave network initiates network access and accesses the network.
  • the synchronization resource of the terminal wherein the network access module of the D2D slave terminal reports the terminal type in the network access process, and the terminal type is a D2D slave terminal.
  • the processor 72 may further instruct the network access module of the D2D terminal to initiate the network device after receiving the synchronization resource of the D2D master terminal corresponding to the D2D slave terminal that is notified by the network device by the transceiver 71. The release process of the link between.
  • the synchronization resource further includes a time-frequency resource for transmitting synchronization feedback information.
  • the processor 72 can send the synchronization feedback information to the D2D master terminal corresponding to the D2D slave terminal through the transceiver 71 according to the time-frequency resource for transmitting the synchronization feedback information.
  • the processor 72 may go to the D2D when the strength of the synchronization signal sent by the D2D master terminal corresponding to the D2D slave terminal received by the transceiver 71 exceeds a set threshold.
  • the D2D primary terminal corresponding to the terminal sends a reduced power indication, where the reduced power indication is used to instruct the D2D primary terminal to reduce the synchronization signal sending power; or, according to the received by the transceiver
  • the D2D sends a synchronization confirmation indication from the D2D master terminal corresponding to the terminal.
  • FIG. 8A is a schematic structural diagram of a network device according to an embodiment of the present invention.
  • the network device may be the eNB in the above embodiment.
  • the network device can be a network access device that implements eB-like functionality.
  • the network device may include: a receiving module 801, a synchronization resource allocation module 803, and a notification module 803.
  • the main functions of the above functional modules of the network device may include:
  • the receiving module 801 is configured to receive, by the D2D primary terminal, a measurement result of a time-frequency resource set for transmitting a synchronization signal;
  • a synchronization resource allocation module 802 configured to allocate a synchronization resource to the D2D master terminal according to the measurement result received by the receiving module;
  • the notification module 803 is configured to notify the D2D master terminal of the synchronization resource allocated by the synchronization resource allocation module for the D2D master terminal.
  • the notification module 803 may also notify the D2D slave terminal corresponding to the D2D master terminal of the synchronization resource allocated by the D2D master terminal.
  • the notification module 803 may further notify the D2D master terminal to send a synchronization signal after learning that the D2D slave terminal corresponding to the D2D master terminal accesses the network.
  • the notification module 803 may further indicate the D2D master after receiving a message sent by the D2D slave terminal corresponding to the D2D master terminal to notify the D2D slave terminal that the macro cell is camped on. The terminal stops transmitting the synchronization signal.
  • the synchronization resource includes: a time-frequency resource for transmitting a synchronization signal, or includes: a time-frequency resource for transmitting a synchronization signal and a time-frequency resource for transmitting synchronization feedback information.
  • the D2D master terminal reports the result of measuring the time-frequency resource set for transmitting the synchronization signal to the network device, so that the network device allocates the synchronization resource to the D2D master terminal according to the measurement result, thereby A synchronization signal is transmitted on the synchronization resource to implement initial synchronization between the D2D terminals.
  • FIG. 8B is a schematic structural diagram of hardware of a network device according to an embodiment of the present invention.
  • the network device may be the eNB in the above embodiment.
  • the network device may be a network access device that implements functions similar to an eNB.
  • the network device can include a transceiver 81, a processor 82, and can further include a memory 83. Further, the processor 82 can implement a synchronous resource allocation function 821 and a notification function 822.
  • the components of the network device :
  • the transceiver 81 is configured to receive a measurement result of a time-frequency resource set for transmitting a synchronization signal reported by the D2D primary terminal;
  • the processor 82 is configured to allocate a synchronization resource to the D2D master terminal according to the measurement result received by the transceiver 81, and notify the synchronization resource allocation module by the synchronization resource allocation module for the D2D master terminal by using the transceiver 81. Give the D2D master terminal.
  • the processor 82 may notify the D2D slave terminal corresponding to the D2D master terminal of the synchronization resource allocated by the D2D master terminal through the transceiver 81.
  • the processor 81 may further notify the D2D master terminal to send a synchronization signal by using the transceiver 81 after learning that the D2D slave terminal corresponding to the D2D master terminal accesses the network.
  • the processor 82 may also pass the message sent by the D2D slave terminal corresponding to the D2D master terminal through the transceiver 81 to notify the D2D slave terminal that the macro cell is camped on.
  • the transceiver 81 instructs the D2D master terminal to stop transmitting the synchronization signal.
  • the synchronization resource includes: a time-frequency resource for transmitting a synchronization signal, or includes: a time-frequency resource for transmitting a synchronization signal and a time-frequency resource for transmitting synchronization feedback information.
  • embodiments of the present invention can be provided as a method, system, or computer program product. Accordingly, the present invention may take the form of an entirely hardware embodiment, an entirely software embodiment, or a combination of software and hardware. Moreover, the invention can take the form of a computer program product embodied on one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) including computer usable program code.
  • computer-usable storage media including but not limited to disk storage, CD-ROM, optical storage, etc.
  • the computer program instructions can also be stored in a computer readable memory that can direct a computer or other programmable data processing device to operate in a particular manner, such that the instructions stored in the computer readable memory produce an article of manufacture comprising the instruction device.
  • the apparatus implements the functions specified in one or more blocks of a flow or a flow and/or block diagram of the flowchart.
  • These computer program instructions can also be loaded onto a computer or other programmable data processing device such that a series of operational steps are performed on a computer or other programmable device to produce computer-implemented processing for execution on a computer or other programmable device.
  • the instructions provide steps for implementing the functions specified in one or more of the flow or in a block or blocks of a flow diagram.

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Abstract

一种D2D终端间的初始同步方法及设备，用以实现D2D终端间的初始同步。本发明中，D2D主终端对用于传输同步信号的时频资源集进行测量，并向网络设备上报测量结果；所述D2D主终端接收所述网络设备根据所述D2D主终端上报的测量结果为所述D2D主终端分配的同步资源；所述D2D主终端根据为所述D2D主终端分配的同步资源发送同步信号。

Description

D2D终端间的初始同歩方法及设备
技术领域
本发明涉及无线通信技术领域， 尤其涉及 D2D终端间的初始同步方法及 设备。 背景技术
现有的宏网能够达到的室外覆盖率高于室内覆盖率， 尤其在室内的墙角 处或者地下室等处， 因信号的强度较弱， 导致无法通信。 但是， 有不少应用 是需要在室内进行， 比如在智能电表的应用中， 希望放在地下室的电表能够 通过网络定期上报数据给电力公司， 这就要求在室内信号较弱的地方也能与 网络进行通信。
为了达到室内的覆盖的目的， 一种方案是增加室内的接入点， 但这给运 营商带来巨大的投资。
目前， 提出了一种新的覆盖增强的方案， 能够在提供网络覆盖增强的同 时， 降低运营商建网的成本。 该方案可称为 Twin UE方案， Twin UE包括两 个 UE( User Equipment,用户设备，即终端），其中一个是主终端，称为 DM-UE ( D2D master UE, D2D主终端； D2D: device-to-device, 设备到设备）， 另一 个是从终端， 称为 DS-UE ( D2D slave UE, D2D从终端）。
为了使 DS-UE能够接收网络的数据以及 DS-UE发送数据给网络，则需要 保证 DM-UE以及 DS-UE与网絡侧的同步。 由于 DM-UE在网络覆盖内， 可 实现与网络侧的同步，因此通过 DS-UE与 DM-UE间的同步，即可实现 DM-UE 以及 DS-UE与网络侧的同步。但目前尚未提供 DM-UE与 DS-UE之间同步的 方案。 发明内容
本发明实施例提供了一种 D2D终端间的初始同步方法及设备， 用以实现 D2D终端间的初始同步。
第一方面， 提供了一种设备到设备 D2D终端间的初始同步方法， 所述方 法包括：
D2D主终端对用于传输同步信号的时频资源集进行测量， 并向网络设备 上报测量结果；所述 D2D主终端接收所述网络设备根据所述 D2D主终端上报的 测量结果为所述 D2D主终端分配的同步资源；所述 D2D主终端根据为所述 D2D 主终端分配的同步资源发送同步信号。
结合第一方面， 在第一种可能的实现方式中， 所述 D2D主终端对用于传 输同步信号的时频资源集进行测量， 包括： 所述 D2D主终端根据预先设置于 所述 D2D主终端的用于传输同步信号的时频资源集进行测量； 或者， 所述 D2D 主终端从所述网络设备发送的广播消息中获取用于传输同步信号的时频资源 集， 并根据获取到的时频资源集进行测量。
结合第一方面， 在第二种可能的实现方式中， 所述 D2D主终端在发起网 络接入并接入网络后， 向所述网络设备上报所述测量结果； 其中， 所述 D2D 主终端在网络接入过程中上 4艮接入原因和终端类型， 所述接入原因为测量上 报， 所述终端类型为 D2D主终端。
结合第一方面或第一方面的第一种和第二种可能的实现方式中的一种， 在第三种可能的实现方式中， 所述同步资源包括用于传输同步信号的时频资 源； 括：
所述 D2D终端接收到所述网络设备为所述 D2D主终端分配的用于传输同 步信号的时频资源后立即在所述分配的用于传输同步信号的时频资源位置上 发送同步信号； 或者
所述 D2D终端接收到所述网络设备为所述 D2D主终端分配的用于传输同 步信号的时频资源后， 在接收到所述网络设备发送的同步指示时， 在所述分 配的用于传输同步信号的时频资源位置上发送同步信号； 其中， 所述同步指 示是所述网络设备在获知与所述 D2D终端对应的 D2D从终端接入网络时发送 的。
结合第一方面的第三种可能的实现方式， 在第四种可能的实现方式中， 所述同步资源还包括用于传输同步反馈信息的时频资源； 所述方法还包括： 所述 D2D主终端根据所述用于传输同步反馈信息的时频资源， 接收与所 述 D2D主终端对应的 D2D从终端发送的同步反馈信息，并当接收到的同步反馈 信息为降低功率指示时， 降低同步信号的发送功率。
结合第一方面的第四种可能的实现方式， 在第五种可能的实现方式中， 若与所述 D2D主终端对应的 D2D从终端的数量为至少 2个， 则所述 D2D主终端 在接收到与所述 D2D主终端对应的所有 D2D从终端发送的降低功率指示后，降 低同步信号的发送功率。
第二方面， 提供了一种设备到设备 D2D终端间的初步同步方法， 所述方 法包括： 步资源中包括用于传输同步信号的时频资源； 所述 D2D从终端根据获取到的 所述同步资源中用于传输同步信号的时频资源， 接收与所述 D2D从终端对应 的 D2D主终端发送的同步信号；所述 D2D从终端根据接收到的同步信号与所述 D2D从终端对应的 D2D主终端进行同步。
结合第二方面， 在第一种可能的实现方式中， 所述 D2D从终端获取与所 述 D2D从终端对应的 D2D主终端的同步资源， 包括：
所述 D2D从终端根据预先设置于所述 D2D从终端的用于传输同步信号的 时频资源集进行信号搜索， 当搜索到的信号中所携带的终端标识为所述 D2D 从终端对应的 D2D主终端的标识时， 将当前搜索到的信号所使用的时频资源 者
所述 D2D从终端接收网絡设备通知的与所述 D2D从终端对应的 D2D主终 端的同步资源， 所述同步资源是所述网络设备根据与所述 D2D从终端对应的 D2D主终端上报的测量结果为所述 D2D主终端分配的，所述测量结果是对用于 传输同步信号的时频资源集进行测量的结果。
结合第二方面的第一种可能的实现方式， 在第二种可能的实现方式中， 所述 D2D从终端在发起网络接入并接入网络后， 接收所述网络设备通知的与 所述 D2D从终端对应的 D2D主终端的同步资源； 其中， 所述 D2D从终端在网络 接入过程中上报终端类型， 所述终端类型为 D2D从终端；
所述方法还包括：所述 D2D从终端接收到所述网络设备通知的与所述 D2D 从终端对应的 D2D主终端的同步资源后 , 发起与所述网络设备间的链路的释 放过程。
结合第二方面或第二方面的第一种和第二种可能的实现方式中的一种， 在第三种可能的实现方式中， 所述同步资源中还包括用于传输同步反馈信息 的时频资源， 所述方法还包括：
所述 D2D从终端根据所述用于传输同步反馈信息的时频资源， 向与所述 D2D从终端对应的 D2D主终端发送同步反馈信息。
结合第二方面的第三种可能的实现方式， 在第四种可能的实现方式中， 所述向与所述 D2D从终端对应的 D2D主终端发送同步反馈信息， 包括：
若所述 D2D从终端接收到的与所述 D2D从终端对应的 D2D主终端发送的 同步信号的强度超过设定门限，则向与所述 D2D从终端对应的 D2D主终端发送 降低功率指示， 所述降低功率指示用于指示 D2D主终端降低同步信号发送功 率； 或者
若所述 D2D从终端根据接收到的同步信号与所述 D2D从终端对应的 D2D 主终端完成同步， 则向与所述 D2D从终端对应的 D2D主终端发送同步确认指 示。
第三方面， 提供了一种设备到设备 D2D终端间的初步同步方法， 所述方 法包括：
网络设备接收 D2D主终端上报的用于传输同步信号的时频资源集的测量 结果； 所述网络设备根据所述测量结果为所述 D2D主终端分配同步资源； 所述网络设备将为所述 D2D主终端分配的同步资源通知给所述 D2D主终 端。
结合第三方面， 在第一种可能的实现方式中， 所述方法还包括： 所述网 络设备将为所述 D2D主终端分配的同步资源通知给所述 D2D主终端对应的 D2D从终端。
结合第三方面， 在第二种可能的实现方式中， 所述方法还包括： 所述网 络设备在获知与所述 D2D主终端对应的 D2D从终端接入网络后，通知所述 D2D 主终端发送同步信号。
结合第三方面， 在第三种可能的实现方式中， 所述网络设备接收到所述 D2D主终端对应的 D2D从终端发送的用于通知该 D2D从终端已驻留宏小区的 消息后， 指示所述 D2D主终端停止发送同步信号。
结合第三方面或第三方面的第一种至第三种可能的实现方式中的一种， 在第四种可能的实现方式中， 所述同步资源包括： 用于传输同步信号的时频 资源， 或者包括： 用于传输同步信号的时频资源和用于传输同步反馈信息的 时频资源。
第四方面， 提供了一种设备到设备 D2D终端， 包括：
测量模块， 用于对用于传输同步信号的时频资源集进行测量， 并向网络 设备上报所述测量模块的测量结果；
同步资源配置模块， 用于接收所述网络设备根据所述测量模块测量并上 艮的测量结果为所述 D2D主终端分配的同步资源；
同步信号传输模块， 用于根据所述同步资源配置模块接收到的所述为所 述 D2D主终端分配的同步资源发送同步信号。
结合第四方面， 在第一种可能的实现方式中， 所述测量模块具体用于， 根据预先设置于所述 D2D主终端的用于传输同步信号的时频资源集进行测 量； 或者， 从所述网络设备发送的广播消息中获取用于传输同步信号的时频 资源集， 并根据获取到的时频资源集进行测量。 结合第四方面， 在第二种可能的实现方式中， 所述测量模块具体用于， 在发起网络接入并接入网絡后， 向所述网络设备上报所述测量结果； 其中， 所述 D2D终端的网络接入模块在网络接入过程中上报接入原因和终端类型 , 所述接入原因为测量上报， 所述终端类型为 D2D主终端。
结合第四方面或第四方面的第一种和第二种可能的实现方式中的一种， 在第三种可能的实现方式中， 所述同步资源包括用于传输同步信号的时频资 源；
同步信号传输模块具体用于， 在所述同步资源配置模块接收到所述网络 设备为所述 D2D主终端分配的用于传输同步信号的时频资源后立即在所述分 配的用于传输同步信号的时频资源位置上发送同步信号； 或者， 在接收到所 述网络设备为所述 D2D主终端分配的用于传输同步信号的时频资源后， 在接 收到所述网络设备发送的同步指示时， 在所述分配的用于传输同步信号的时 频资源位置上发送同步信号； 其中， 所述同步指示是所述网络设备在获知与 所述 D2D终端对应的 D2D从终端接入网络时发送的。
结合第四方面的第三种可能的实现方式， 在第四种可能的实现方式中， 所述同步资源还包括用于传输同步反馈信息的时频资源；
所述同步信号传输模块还用于， 根据所述用于传输同步反馈信息的时频 资源，接收与所述 D2D主终端对应的 D2D从终端发送的同步反馈信息， 并当接 收到的同步反馈信息为降低功率指示时， 降低同步信号的发送功率。
结合第四方面的第四种可能的实现方式， 在第五种可能的实现方式中， 所述同步信号传输模块具体用于，在与所述 D2D主终端对应的 D2D从终端的数 量为至少 2个的情况下， 在接收到与所述 D2D主终端对应的所有 D2D从终端发 送的降低功率指示后， 降低同步信号的发送功率。
第五方面， 提供了一种设备到设备 D2D终端， 包括： 资源， 所述同步资源中包括用于传输同步信号的时频资源；
同步信号传输模块， 用于根据所述同步资源配置模块获取到的所述同步 资源中用于传输同步信号的时频资源，接收与所述 D2D从终端对应的 D2D主终 端发送的同步信号；
同步模块，用于根据接收到的同步信号与所述 D2D从终端对应的 D2D主终 端进行同步。
结合第五方面， 在第一种可能的实现方式中， 所述同步资源配置模块具 体用于， 根据预先设置于所述 D2D从终端的用于传输同步信号的时频资源集 进行信号搜索， 当搜索到的信号中所携带的终端标识为所述 D2D从终端对应 的 D2D主终端的标识时， 将当前搜索到的信号所使用的时频资源确定为与所 述 D2D从终端对应的 D2D主终端用于传输同步信号的时频资源； 或者，接收网 络设备通知的与所述 D2D从终端对应的 D2D主终端的同步资源 ,所述同步资源 是所述网络设备根据与所述 D2D从终端对应的 D2D主终端上报的测量结果为 所述 D2D主终端分配的， 所述测量结果是对用于传输同步信号的时频资源集 进行测量的结果。
结合第五方明的第一种可能的实现方式， 在第二种可能的实现方式中， 所述同步资源配置模块具体用于， 在所述 D2D从终端发起网络接入并接入网 络后 ,接收所述网络设备通知的与所述 D2D从终端对应的 D2D主终端的同步资 源； 其中， 所述 D2D从终端的网络接入模块在网络接入过程中上报终端类型， 所述终端类型为 D2D从终端；
所述同步资源配置模块还用于， 在接收到所述网络设备通知的与所述 D2D从终端对应的 D2D主终端的同步资源后，指示所述 D2D终端的网络接入模 块发起与所述网絡设备间的链路的释放过程。
结合第五方面或第五方面的第一种和第二种可能的实现方式中的一种， 在第三种可能的实现方式中， 所述同步资源中还包括用于传输同步反馈信息 的时频资源；
所述同步信号传输模块还用于， 根据所述用于传输同步反馈信息的时频 资源， 向与所述 D2D从终端对应的 D2D主终端发送同步反馈信息。
结合第五方面的第三种可能的实现方式， 在第四种可能的实现方式中， 所述同步信号传输模块具体用于 , 在接收到的与所述 D2D从终端对应的 D2D 主终端发送的同步信号的强度超过设定门限时， 向与所述 D2D从终端对应的 D2D主终端发送降低功率指示，所述降低功率指示用于指示 D2D主终端降低同 步信号发送功率； 或者， 在根据接收到的同步信号与所述 D2D从终端对应的 D2D主终端完成同步后，向与所述 D2D从终端对应的 D2D主终端发送同步确认 指示。
第六方面， 提供了一种网络设备， 包括：
接收模块， 用于接收 D2D主终端上报的用于传输同步信号的时频资源集 的测量结果；
同步资源分配模块， 用于根据所述接收模块接收到的所述测量结果为所 述 D2D主终端分配同步资源；
通知模块， 用于将所述同步资源分配模块为所述 D2D主终端分配的同步 资源通知给所述 D2D主终端。
结合第六方面， 在第一种可能的实现方式中， 所述通知模块还用于， 将 为所述 D2D主终端分配的同步资源通知给所述 D2D主终端对应的 D2D从终端。
结合第六方面， 在第二种可能的实现方式中， 所述通知模块还用于， 在 获知与所述 D2D主终端对应的 D2D从终端接入网絡后，通知所述 D2D主终端发 送同步信号。
结合第六方面， 在第三种可能的实现方式中， 所述通知模块还用于， 在 接收到所述 D2D主终端对应的 D2D从终端发送的用于通知该 D2D从终端已驻 留宏小区的消息后， 指示所述 D2D主终端停止发送同步信号。
结合第六方面或第六方面的第一种至第三种可能的实现方式中的一种， 在第四种可能的实现方式中， 所述同步资源包括： 用于传输同步信号的时频 资源， 或者包括： 用于传输同步信号的时频资源和用于传输同步反馈信息的 时频资源。 本发明的上述实施例中， D2D主终端通过向网络设备上 ^艮对用于 传输同步信号的时频资源集进行测量的结果， 使网络设备根据该测量结果为 该 D2D 主终端分配同步资源， 从而在该同步资源上发送同步信号， 以实现 D2D终端间的初始同步。
第七方面， 提供了一种设备到设备 D2D终端， 包括收发器和处理器； 所述处理器， 用于通过所述收发器对用于传输同步信号的时频资源集进 行测量， 并向网络设备上报所述测量模块的测量结果；
通过所述收发器接收所述网络设备根据所述测量结果为所述 D2D主终端 分配的同步资源； 以及
根据所述为所述 D2D主终端分配的同步资源， 并通过所述收发器发送同 步信号。
结合第七方面， 在第一种可能的实现方式中， 所述处理器具体用于， 根 据预先设置于所述 D2D主终端的用于传输同步信号的时频资源集， 并通过所 述收发器进行测量； 或者， 通过所述收发器从所述网络设备发送的广播消息 中获取用于传输同步信号的时频资源集， 并根据获取到的时频资源集， 并通 过所述收发器进行测量。
结合第七方面， 在第二种可能的实现方式中， 所述处理器具体用于， 在 发起网络接入并接入网络后， 通过所述收发器向所述网络设备上报所述测量 结果； 其中， 所述 D2D终端的网络接入模块在网络接入过程中上报接入原因 和终端类型 , 所述接入原因为测量上 所述终端类型为 D2D主终端。
结合第七方面或第七方面的第一种和第二种可能的实现方式中的一种， 在第三种可能的实现方式中， 所述同步资源包括用于传输同步信号的时频资 源；
所述处理器具体用于， 在所述同步资源配置模块接收到所述网络设备为 所述 D2D主终端分配的用于传输同步信号的时频资源后立即通过所述收发器 在所述分配的用于传输同步信号的时频资源位置上发送同步信号； 或者， 通 过所述收发器在接收到所述网络设备为所述 D2D主终端分配的用于传输同步 信号的时频资源后， 在通过所述收发器接收到所述网络设备发送的同步指示 时， 通过所述收发器在所述分配的用于传输同步信号的时频资源位置上发送 同步信号； 其中， 所述同步指示是所述网络设备在获知与所述 D2D终端对应 的 D2D从终端接入网络时发送的。
结合第七方面的第三种可能的实现方式， 在第四种可能的实现方式中， 所述同步资源还包括用于传输同步反馈信息的时频资源；
所述处理器还用于， 根据所述用于传输同步反馈信息的时频资源， 通过 所述收发器接收与所述 D2D主终端对应的 D2D从终端发送的同步反馈信息，并 当接收到的同步反馈信息为降低功率指示时， 降低所述收发器的同步信号的 发送功率。
结合第七方面的第四种可能的实现方式， 在第五种可能的实现方式中， 所述处理器具体用于， 在与所述 D2D主终端对应的 D2D从终端的数量为至少 2 个的情况下，在通过所述收发器接收到与所述 D2D主终端对应的所有 D2D从终 端发送的降低功率指示后， 降低所述收发器的同步信号的发送功率。
第八方面， 提供了一种设备到设备 D2D终端， 包括收发器和处理器； 所述处理器，用于通过所述收发器获取与所述 D2D从终端对应的 D2D主终 端的同步资源， 所述同步资源中包括用于传输同步信号的时频资源；
根据获取到的所述同步资源中用于传输同步信号的时频资源， 通过所述 收发器接收与所述 D2D从终端对应的 D2D主终端发送的同步信号； 以及
根据接收到的同步信号与所述 D2D从终端对应的 D2D主终端进行同步。 结合第八方面， 在第一种可能的实现方式中， 所述处理器具体用于， 通 过所述收发器， 根据预先设置于所述 D2D从终端的用于传输同步信号的时频 资源集进行信号搜索， 当搜索到的信号中所携带的终端标识为所述 D2D从终 端对应的 D2D主终端的标识时， 将当前搜索到的信号所使用的时频资源确定 为与所述 D2D从终端对应的 D2D主终端用于传输同步信号的时频资源； 或者， 通过所述收发器接收网络设备通知的与所述 D2D从终端对应的 D2D主终端的 同步资源， 所述同步资源是所述网络设备根据与所述 D2D从终端对应的 D2D 主终端上报的测量结果为所述 D2D主终端分配的， 所述测量结果是对用于传 输同步信号的时频资源集进行测量的结果。
结合第八方明的第一种可能的实现方式， 在第二种可能的实现方式中， 所述处理器具体用于， 在所述 D2D从终端发起网络接入并接入网络后， 通过 所述收发器接收所述网络设备通知的与所述 D2D从终端对应的 D2D主终端的 同步资源； 其中， 所述 D2D从终端的网络接入模块在网络接入过程中上报终 端类型， 所述终端类型为 D2D从终端；
所述处理器还用于， 在通过所述收发器接收到所述网络设备通知的与所 述 D2D从终端对应的 D2D主终端的同步资源后，指示所述 D2D终端的网络接入 模块发起与所述网络设备间的链路的释放过程。
结合第八方面或第八方面的第一种和第二种可能的实现方式中的一种， 在第三种可能的实现方式中， 所述同步资源中还包括用于传输同步反馈信息 的时频资源；
所述处理器还用于， 根据所述用于传输同步反馈信息的时频资源， 通过 所述收发器向与所述 D2D从终端对应的 D2D主终端发送同步反馈信息。
结合第八方面的第三种可能的实现方式， 在第四种可能的实现方式中， 所述处理器具体用于 , 在通过所述收发器接收到的与所述 D2D从终端对应的 D2D主终端发送的同步信号的强度超过设定门限时，向与所述 D2D从终端对应 的 D2D主终端发送降低功率指示，所述降低功率指示用于指示 D2D主终端降低 同步信号发送功率； 或者， 在根据所述收发器接收到的同步信号与所述 D2D 从终端对应的 D2D主终端完成同步后，通过所述收发器向与所述 D2D从终端对 应的 D2D主终端发送同步确认指示。
第九方面， 提供了一种网络设备， 包括收发器和处理器；
所述收发器， 用于接收 D2D主终端上报的用于传输同步信号的时频资源 集的测量结果；
所述处理器， 用于根据所述收发器接收到的所述测量结果为所述 D2D主 终端分配同步资源， 并通过所述收发器将所述同步资源分配模块为所述 D2D 主终端分配的同步资源通知给所述 D2D主终端。
结合第九方面， 在第一种可能的实现方式中， 所述处理器具体用于， 通 过所述收发器将为所述 D2D主终端分配的同步资源通知给所述 D2D主终端对 应的 D2D从终端。
结合第九方面， 在第二种可能的实现方式中， 所述处理器还用于， 在获 知与所述 D2D主终端对应的 D2D从终端接入网络后，通过所述收发器通知所述 D2D主终端发送同步信号。
结合第九方面， 在第三种可能的实现方式中， 所述处理器还用于， 在通 过所述收发器接收到所述 D 2 D主终端对应的 D 2 D从终端发送的用于通知该 D2D从终端已驻留宏小区的消息后，通过所述收发器指示所述 D2D主终端停止 发送同步信号。
结合第九方面或第九方面的第一种至第三种可能的实现方式中的一种， 在第四种可能的实现方式中， 所述同步资源包括： 用于传输同步信号的时频 资源， 或者包括： 用于传输同步信号的时频资源和用于传输同步反馈信息的 时频资源。
本发明的上述实施例中， D2D 主终端通过向网络设备上报对用于传输同 步信号的时频资源集进行测量的结果， 使网络设备根据该测量结果为该 D2D 主终端分配同步资源， 从而在该同步资源上发送同步信号， 以实现 D2D终端 间的初始同步。 附图说明
为了更清楚地说明本发明实施例中的技术方案， 下面将对实施例描述中 所需要使用的附图作筒要介绍， 显而易见地， 下面描述中的附图仅仅是本发 明的一些实施例， 对于本领域的普通技术人员来讲， 在不付出创造性劳动性 的前提下， 还可以根据这些附图获得其他的附图。
图 1为现有技术中的 DM-UE和 DS-UE通信的示意图；
图 2为本发明实施例提供的 DM-UE侧的处理流程示意图；
图 3为本发明实施例提供的 DS-UE侧的处理流程示意图；
图 4为本发明实施例提供的 e B侧的处理流程示意图；
图 5为本发明实施例提供的具体应用场景下的流程示意图； 图 6A和图 6B分别为本发明实施例提供的 D2D主终端的结构示意图; 图 7A和图 7B分别为本发明实施例提供的 D2D从终端的结构示意图; 图 8A和图 8B分别为本发明实施例提供的网络设备的结构示意图。 具体实施方式
本发明实施例提供了一种 D2D终端间的初始同步方案， 通过该方案可以 使 DM-UE与 DS-UE获取同步资源， 从而进行 DM-UE与 DS-UE间的同步。 进一步的， DM-UE还可以根据 DS-UE发送的同步反馈信息， 对同步信号发 送功率进行调整，以达到节省终端开销和降低或者避免对其他 020对（即 Twin UE ) 的干 4尤的目的。
通常情况下， DM-UE位于网络信号覆盖区域， 比如， 可将位于网络信号 覆盖区域的 UE配置为 DM-UE。本发明实施例中， DM-UE可对用于传输同步 信号的时频资源集进行测量并将测量结果上报给网络设备， 网络设备根据该 测量结果为该 DM-UE分配同步资源，该同步资源可包括用于传输同步信号的 时频资源 （本发明实施例中的同步信号是指 DM-UE与 DS-UE之间的同步信 号 ), 进一步的还可包括用于传输同步反馈信息的时频资源； 该 DM-UE在网 络设备为该 DM-UE分配的用于传输同步信号的时频资源上发送同步信号，如 果网络设备还为该 DM-UE 分配了用于传输同步反馈信息的时频资源， 则该 DM-UE还在该用于传输同步反馈信息的时频资源上接收与该 DM-UE对应的 DS-UE发送的同步反馈信息， 并可根据接收到的同步反馈信息调整同步信号 的发送功率。
考虑到 DS-UE的安装位置通常不在网络信号覆盖区域之内， 本发明实施 例中可首先将 DS-UE放置于网络信号覆盖范围内，以使 DS-UE可从网络设备 获得与该 DS-UE对应的 DM-UE的同步资源。 该同步资源可包括用于传输同 步信号的时频资源， 进一步的还可包括用于传输同步反馈信息的时频资源； DS-UE 可在该用于传输同步信号的时频资源上接收与该 DS-UE 对应的 DM-UE发送的同步信号，进而根据接收到的同步信号与该 DM-UE进行同步， 还可在该用于传输同步反馈信息的时频资源上发送同步反馈信息。 DS-UE也 可以通过信号搜索的方式获得与该 DS-UE对应的 DM-UE的同步资源。
在上述过程中， 网络设备主要负责为 DM-UE分配同步资源 (包括用于传 输同步信号的时频资源， 还可包括用于传输同步反馈信息的时频资源）， 并将 分配的同步资源通知给该 DM-UE和与该 DM-UE对应的 DS-UE。 进一步的， 网络设备还可以对 DM-UE与 DS-UE的同步过程进行控制，比如指示 DM-UE 开始发送同步信号和 /或指示 DM-UE停止发送同步信号。
下面结合附图， 分别对 DM-UE侧的处理流程、 DS-UE侧的处理流程以 及网络侧的处理流程进行详细描述。
参见图 2， 为本发明实施例提供的 DM-UE侧的处理流程示意图， 如图所 示， 该流程可包括：
步驟 201 : DM-UE对用于传输同步信号的时频资源集进行测量。
具体实施时， DM-UE可采用以下两种方式中的任意一种进行时频资源集 的测量：
方式一： DM-UE根据预先设置于该 DM-UE的用于传输同步信号的时频 资源集进行测量。 具体的， 可预先在 DM-UE中设置同步资源集， 其中至少包 括用于传输同步信号的时频资源集， 比如通过协议规定的方式规定该同步资 源集。 所述用于传输同步信号的时频资源集中的时频资源为上行时频资源， 该上行时频资源可包括但不限于 RB ( Radio Bearer, 无线承载） 资源、 符号。 表 1示出了一种时频资源集的形式。
表 1 : 同步资源集
资源序号 用于传输同步信号的时频资源
1 每 5个帧的第 0、 5子帧的 RB=2的第 5、 6符号
2 每 m个子帧的第 n、 k子帧的 RB=p的第 x、 y符
号 进一步的， 同步资源集中还可包括用于传输同步反馈信息的时频资源集 , 用于传输同步信号反馈信息的时频资源集中的时频资源为上行时频资源， 该 上行时频资源可包括但不限于 RB资源、符号， 并且用于传输同步反馈信息的 时频资源与用于传输同步信号的时频资源存在一一对应的关系。 表 2 示出了 一种时频资源集的形式：
表 2: 同步资源表
Figure imgf000016_0001
表 1和表 2中的 m、 n、 k、 p、 x、 y， 以及 m，、 n，、 k'、 p'、 x，、 y，均为示意， 不代表任何特定含义。
DM-UE在同步资源集中的每个用于传输同步信号的时频资源上接收信 号， 以检测该时频资源集中各个时频资源上的信号强度。
方式二： DM-UE从网络设备发送的广播消息中获取同步资源集， 其中至 少包括用于传输同步信号的时频资源集， 并可进一步包括用于传输同步反馈 信息的时频资源集， DM-UE根据获取到的用于传输同步信号的时频资源集进 行测量。
具体的， 网络设备可通过广播消息发送同步资源集， 比如可在广播消息 中增加信息单元来指示该同步资源集。 同步资源集的内容同前所述。 DM-UE 接收到该广播消息后， 从该广播消息获得用于传输同步信号的时频资源集， 并在该时频资源集中的每个时频资源上接收信号， 以检测该时频资源集中的 各个时频资源上的信号强度。 步骤 202: 该 DM-UE向网络设备上报测量结果。
具体实施时， DM-UE可在发起网络接入过程 （比如随机接入过程） 并接 入网络后， 向网络设备上报测量结果。 所述测量结果为 DM-UE所检测到的用 于传输同步信号的时频资源集中的各个时频资源上的信号强度。
进一步的， DM-UE可在发送的随机接入请求消息携带的接入原因中， 指 示出接入原因为上报测量结果， 并可进一步在上报终端能力信息时指示出该 DM-UE的类型， 即指示出该 DM-UE为 D2D主终端。
步骤 203 : 该 DM-UE接收该网络设备根据该 DM-UE上报的测量结果为该 DM-UE分配的同步资源，所述同步资源可包括用于传输同步信号的时频资源， 进一步的还可包括用于传输同步反馈信息的时频资源。
具体实施时， 在网络设备仅为 DM-UE分配用于传输同步信号的时频资源 的情况下， 该网络设备可根据 DM-UE上报的时频资源集中各时频资源上的信 号强度， 选择其中信号强度较小的时频资源作为该 DM-UE的用于传输同步信 号的时频资源 , 并将为该 DM-UE分配的用于传输同步信号的时频资源通知给 该 DM-UE。
在网络设备为 DM-UE分配用于传输同步信号的时频资源和用于传输同步 反馈信息的时频资源的情况下， 网络设备上可预置如表 2所示的同步资源集， 网络设备可根据 DM-UE上报的时频资源集中各个时频资源上的信号强度， 选 择其中信号强度最较小的 "用于传输同步信号的时频资源" ， 并通过查询表 2 获得对应的 "用于传输同步反馈信息的时频资源" ， 并将该 "用于传输同步 信号的时频资源"以及"用于传输同步反馈信息的时频资源"分配给该 DM-UE。
网络设备在将分配的同步资源通知给 DM-UE时， 可将同步资源的参数发 送给 DM-UE，也可仅将同步资源的资源序号发送给 DM-UE，以减少网络开销。
DM-UE收到资源序号后， 可通过查询预置于本地的同步资源集获得对应的同 步资源。
优选的， 网絡设备根据 DM-UE上报的时频资源集中各时频资源上的信号 强度， 选择 "用于传输同步信号的时频资源" 时， 可选择信号强度最小的时 频资源， 以最大限度的降低或避免 DM-UE发送的同步信号对其它 Twin UE的 干扰。
步骤 204~205： 该 DM-UE根据为该 DM-UE分配的同步资源发送同步信号。 进一步的， 在同步资源中还包括用于传输同步反馈信息的时频资源的情况下， 该 DM-UE根据用于传输同步反馈信息的时频资源接收与该 DM-UE对应的 DS-UE发送的同步反馈信息。
具体实施时， DM-UE可在接收到网络设备为该 DM-UE分配的同步资源 后， 立即在该同步资源上发送同步信号， 并可进一步根据该同步资源接收同 步反馈信息 （在为该 DM-UE分配了用于传输同步反馈信息的时频资源的情况 下） ； DM-UE也可在收到网络设备发送的同步指示后， 根据该同步资源发送 同步信号， 并可进一步根据该同步资源接收同步反馈信息 （在为该 DM-UE分 配了用于传输同步反馈信息的时频资源的情况下） 。
所述同步反馈信息可能是同步确认信息， 也可能是功率调整指示信息。 如果 DM-UE接收到的是同步确认信息 , 则 DM-UE可根据该同步确认信息确认 与发送该同步确认信息的 DS-UE同步完成， 并可进一步停止发送同步信号； 如果 DM-UE接收到的是功率调整指示信息， 则 DM-UE调整同步信号的发送功 率。
较佳的， DM-UE在未收到任何的功率调整指示信息之前， DM-UE以最大 固定功率发送同步信号， DM-UE接收到降低功率的指示信息后， 降低同步信 号发送功率。 进一步的， 如果 DM-UE收到提高功率的指示信息， 则提高同步 信号发送功率。
进一步的， 考虑到一个 DM-UE可能对应多个 DS-UE, 在这种情况下， 当 DM-UE接收到其对应的所有 DS-UE发送的功率调整指示（如降低功率的指示 ) 后， 才降低同步信号发送功率； 当 DM-UE接收到其对应的所有 DS-UE发送的 同步确认指示后， 才停止发送同步信号。
进一步的， 为了提高安全性， 可在上述流程的基础上， 在 DM-UE的随机 接入过程中， 通过核心网设备对该 DM-UE进行鉴权。 相应的， 核心网设备鉴 权通过后通知所述网络设备 （如基站） 鉴权成功， 所述网络设备在获知该
DM-UE鉴权成功后， 为该 DM-UE分配同步资源， 并将为该 DM-UE分配的同步 资源通知给该 DM-UE。
通过以上描述可以看出， DM-UE通过向网络设备上报对用于传输同步信 号的时频资源集进行测量的结果， 使网络设备根据该测量结果为该 DM-UE分 配同步资源， 从而在该同步资源上发送同步信号， 以实现 D2D终端间的初始 同步。
参见图 3 ,为本发明实施例提供的 DS-UE侧的处理流程示意图，如图所示， 该流程可包括：
步骤 301： DS-UE获取与该 DS-UE对应的 DM-UE的同步资源。
具体实施时， DS-UE可采用以下两种方式中的任意一种获取与该 DS-UE 对应的 DM-UE的同步资源：
方式一： DS-UE通过对预设的用于传输同步信号的时频资源集进行信号 搜索的方式， 确定出与该 DS-UE对应的 DM-UE的同步资源。
通常情况下， DM-UE会发送广播消息， 消息内包含该 DM-UE的 ID, 并且 DS-UE中预置有该 DS-UE对应的 DM-UE的 ID (通常在出厂时预置） 。 本发明 实施例中， 还在 DS-UE中预置同步资源集， 其中至少包括用于传输同步信号 的时频资源集， 该时频资源集的内容同前所述。 进一步的， 该同步资源集中 还可包括用于传输同步反馈信息的时频资源集， "用于传输同步反馈信息的 时频资源" 与 "用于传输同步信号的时频资源" 存在一一对应的关系。 同步 资源集的内容同前所述。
DS-UE根据预先设置于该 DS-UE的用于传输同步信号的时频资源集进行 信号搜索， 当搜索到的信号中所携带的终端标识为该 DS-UE对应的 DM-UE的 标识时， 将当前搜索到的信号所使用的时频资源确定为与该 DS-UE对应的 DM-UE用于传输同步信号的时频资源。 进一步的， 还可根据确定出的 DM-UE "用于传输同步信号的时频资源" 查询到对应的 "用于传输同步反馈信息的 时频资源" 。 方式二： DS-UE接收网络设备通知的与该 DS-UE对应的 DM-UE用于传输 同步信号的时频资源。
具体实施时， 网络设备在通过图 2中步骤 203的方式为 DM-UE分配同步资 源后进行记录， 当网络设备获知该 DM-UE对应的 DS-UE接入网络时， 将为该 DM-UE分配的同步资源通知给该接入网络的 DS-UE。
步骤 302: 该 DS-UE根据获取到的同步资源中的用于传输同步信号的时频 资源， 接收与该 DS-UE对应的 DM-UE发送的同步信号， 并根据接收到的同步 信号与该 DS-UE对应的 DM-UE进行同步。
步骤 303 : 进一步的， 在该同步资源中还包括用于传输同步反馈信息的时 频资源时， 该 DS-UE还在该用于传输同步反馈信息的时频资源位置上发送同 步反馈信息。
具体实施时， 若该 DS-UE对应的 DM-UE发送的同步信号的强度超过设定 门限， 则该 DS-UE向该 DM-UE发送功率调整指示， 以使 DM-UE根据该指示调 整同步信号发送功率； 否则在同步成功后向与该 DM-UE发送同步确认指示 , 以使 DM-UE停止发送同步信号。
通过以上描述可以看出， DS-UE通过获取与该 DS-UE对应的 DM-UE的同 步资源， 从而根据该同步资源接收该 DM-UE发送的同步信号， 实现 D2D终端 间的初始同步。
参见图 4， 为本发明实施例提供的网络侧的处理流程示意图， 如图所示， 该流程可包括：
步骤 401 : 网络设备接收 DM-UE上报的用于传输同步信号的时频资源集的 测量结果。 DM-UE根据同步资源集进行测量以及上报测量结果的具体实现， 同前所述， 在此不再详述。
步骤 402： 该网络设备根据该测量结果为该 DM-UE分配同步资源。 同前所 述， 网络设备为 DM-UE分配的同步资源中， 可包括用于传输同步信号的时频 资源， 还可包括用于传输同步反馈信息的时频资源， 具体实现方式同前所述， 在此不再详述。 步骤 403： 该网络设备将为该 DM-UE分配的同步资源通知给该 DM-UE, 具体实现方式同前所述， 在此不再详述。
进一步的， 该流程还可包括以下步骤：
步骤 404: 该网络设备在获知与该 DM-UE对应的 DS-UE接入网络后， 将为 该 DM-UE分配的同步资源通知给该 DS-UE。
进一步的， 该流程还可包括以下步骤：
步骤 405: 该网絡设备在获知与该 DM-UE对应的 DS-UE接入网絡后， 通知 该 DM-UE发送同步信号。
上述步骤 404和步骤 405没有严格时序要求。
进一步的 , 该网络设备在接收到该 DM-UE对应的 DS-UE发送的用于通知 该 DS-UE已驻留宏小区的消息后， 指示该 DM-UE停止发送同步信号。
通过以上描述可以看出， 网络设备根据 DM-UE上报的对用于传输同步信 号的时频资源集的测量结果， 为 DM-UE分配同步资源， 并将分配的同步资源 通知给该 DM-UE, 并可进一步通知给该 DM-UE对应的 DS-UE, 从而使 DM-UE 根据该同步资源发送同步信号， 使 DS-UE根据该同步资源接收同步信号， 从 而实现 D2D终端间的初始同步。进一步的， DS-UE还可根据同步资源中的用于 传输同步反馈信息的时频资源发送同步反馈信息， DM-UE根据同步资源中的 用于传输同步反馈信息的时频资源接收同步反馈信息， 从而根据同步反馈信 息调整同步信号的发送功率， 以节省终端消耗并降低或者避免对其他 D2D对 (即 Twin UE ) 的干扰。
上述流程中所述的网络设备可以是基站。
为了便于理解本发明实施例， 下面以一个具体应用场景为例进行说明。 该具体场景中， DM-UE、 DS-UE中预先保存有 DM-UE与 DS-UE的 ID的映 射关系信息 （可在 UE出厂时配置） ， 运营商还将该映射关系信息保存在核心 网侧的功能实体上，该核心网侧的功能实体可以是 MME( Mobility Management Entity, 移动性管理实体） ， 也可以是本发明实施例新设置的功能实体， 如 Twin-UE Server (相关用户服务器） 。 参见图 5 , 为该具体应用场景下的 D2D终端间初始同步的流程示意图。 首先， 将 DM-UE以及与该 DM-UE对应的 DS-UE (以下简称 DS-UE )放置 于室内有网络覆盖的位置。 在步骤 501中， 网络广播用于传输同步信号的时频 资源集， 在步骤 502中， DM-UE对广播的时频资源集进行测量， 得到该时频资 源集当中在各个时频资源的信号强度。
然后， 在步骤 503中， DM-UE发起随机接入过程， 在该过程中， DM-UE 在接入请求原因当中标注是上报用于传输同步信号的时频资源集的测量结 果， 并且在上报 UE能力的时候指示其类型。 核心网设备对该 DM-UE的进行网 络鉴权， 鉴权通过后 DM-UE接入网络。 在步骤 504中， DM-UE接入网络后， 上报上述用于传输同步信号的时频资源集中的各个时频资源的信号强度； 在 步骤 505中，基站根据上报的测量结果为该 DM-UE分配同步资源， 该同步资源 中包括用于传输同步信号的时频资源， 以及用于传输同步反馈信息的时频资 源。
再然后， 在步骤 506中， DS-UE发起随机接入过程接入网絡， 并在上报 UE 能力的时候指示其类型。 核心网设备对该 DS-UE进行鉴权， 鉴权通过后， 在 步骤 507中， 核心网设备根据其存储的有 DM-UE与 DS-UE的 ID的映射关系信 息， 找到与该 DS-UE对应的 DM-UE, 并将找到的 DM-UE的 ID通知给基站； 在 步骤 508中， 基站将该 DM-UE的同步资源通知给该 DS-UE, 并在此之后的步骤 509中， 该 DS-UE发起与基站间的链路的释放过程。 进一步的， 如果没有找到 与该 DS-UE对应的 DM-UE , 则核心网设备通知该 DS-UE没有与之相对应的 DM-UE, 该 DS-UE根据该通知发起与基站间的链路释放过程。
在步骤 510中， 在基站发现 DS-UE接入网络之后， 通过信令的方式通知 DM-UE在分配的用于传输同步信号的时频资源位置上发送同步信号， 并在用 于接收同步反馈信息的时频资源上接收同步反馈信息。
之后， 将 DS-UE放置在实际安装位置上 （DS-UE是否有网络覆盖没有要 求） 。 DS-UE先尝试搜索宏网络， 如果能够驻留在宏网络， 则接入宏网络， 并告知网络侧 （如核心网设备和 /或基站）该 DS-UE驻留在宏网络（比如通过 信令方式通知， 信令消息的内容可以这样的表述 "DS-UE已经驻留在宏网 络，， ) 。 在一个 DM-UE对应一个 DS-UE的情况下， 网络侧在收到该指示后， 通知 DM-UE不用再发送同步信号和对同步反馈信号的检测 （例如可通过信令 方式通知， 信令消息的内容可以这样的表述 "DM-UE停止发送同步信号和对 同步反馈信号的检测" ） 。 如果是一个 DM-UE需要支持多个 DS-UE, 则在网 络侧收到该 DM-UE对应的所有 DS-UE向网络发送驻留宏网络的通知后， 网絡 侧才通知该 DM-UE不用再发送同步信号和对同步反馈信号的检测。
在步骤 511中， DS-UE在无法搜索到宏网络一段时间后 （时间长度可以是 在系统广播消息当中广播的、 在标准当中定义或者是各个厂家自定义的） ， 则开始按照获得的同步资源 （用于传输同步信号的时频资源）接收 DM-UE的 同步信号， 根据接收到的同步信号与 DM-UE进行同步， DS-UE将收到的同步 信号的强度与预设门限进行比较， 如果同步信号强度不高于该门限， 则按照 获得的同步资源 （用于传输同步反馈信息的时频资源）在相应时频资源上反 馈同步确认信息； 如果同步信号强度高于该门限， 则在步骤 512中发出降低同 步信号发送功率的调整指示 （该调整调整指示可以是相对值也可以是绝对 值） 。 DS-UE与 DM-UE同步成功后， DS-UE发送同步确认信息。
在步骤 513中， DM-UE接收到降低同步信号发送功率的调整指示后， 降低 同步信号的发送功率， 直到 DM-UE收到同步确认信息后， 初始同步结束， DM-UE停止发送同步信号。
基于相同的技术构思， 本发明实施例还提供了一种 D2D终端设备和一种 网络设备。 由于这些设备解决问题的原理与上述实施例描述的方法流程相似， 因此这些设备的实施可以参见方法的实施， 重复之处不再赘述。
参见图 6A, 为本发明实施例提供的 D2D终端的逻辑功能结构示意图， 该 D2D终端为 D2D主终端 （DM-UE ) 。 如图 6A所示， 该 D2D终端可包括： 测量 模块 601、 同步资源配置模块 602、 同步信号传输模块 603 , 该 D2D终端还包括 网络接入模块 （未在图中示出） 。 该 D2D终端的上述功能模块的主要功能可 包括： 测量模块 601 , 用于对用于传输同步信号的时频资源集进行测量， 并向网 络设备上报所述测量模块的测量结果；
同步资源配置模块 602 , 用于接收所述网络设备根据测量模块 601测量并 上报的测量结果为所述 D2D主终端分配的同步资源；
同步信号传输模块 603， 用于根据同步资源配置模块 602接收到的所述为 所述 D2D主终端分配的同步资源发送同步信号。
在一种可能的实现方式中， 测量模块 601可根据预先设置于所述 D2D主终 端的用于传输同步信号的时频资源集进行测量； 或者， 从所述网络设备发送 的广播消息中获取用于传输同步信号的时频资源集， 并根据获取到的时频资 源集进行测量。
在一种可能的实现方式中， 测量模块 601可在发起网络接入并接入网络 后， 向所述网络设备上报所述测量结果； 其中， 所述 D2D终端的网络接入模 块在网络接入过程中上报接入原因和终端类型， 所述接入原因为测量上报， 所述终端类型为 D2D主终端。
在一种可能的实现方式中， 所述同步资源包括用于传输同步信号的时频 资源。 相应的， 同步信号传输模块 603可在同步资源配置模块 602接收到所述 网絡设备为所述 D2D主终端分配的用于传输同步信号的时频资源后立即在所 述分配的用于传输同步信号的时频资源位置上发送同步信号； 或者， 在接收 到所述网络设备为所述 D2D主终端分配的用于传输同步信号的时频资源后， 在接收到所述网络设备发送的同步指示时， 在所述分配的用于传输同步信号 的时频资源位置上发送同步信号； 其中， 所述同步指示是所述网络设备在获 知与所述 D2D终端对应的 D2D从终端接入网络时发送的。
在一种可能的实现方式中， 所述同步资源还包括用于传输同步反馈信息 的时频资源。 相应的， 同步信号传输模块 603可根据所述用于传输同步反馈信 息的时频资源， 接收与所述 D2D主终端对应的 D2D从终端发送的同步反馈信 息， 并当接收到的同步反馈信息为降低功率指示时， 降低同步信号的发送功 率。 在一种可能的实现方式中， 同步信号传输模块 603可在与所述 D2D主终端 对应的 D2D从终端的数量为至少 2个的情况下， 在接收到与所述 D2D主终端对 应的所有 D2D从终端发送的降低功率指示后， 降低同步信号的发送功率。
参见图 6B, 为本发明实施例提供的配置为 D2D主终端 （DM-UE ) 的 D2D 终端的硬件结构示意图。 如图所示， 该 D2D终端可包括： 收发器 61、 处理器 62, 进一步的还可包括存储器 63.处理器 62具有测量功能 621、 同步资源配置功 能 622和同步信号传输功能 623 , 上述各功能的具体实现过程可参照图 6A中的 相应功能模块。 具体的， 该 D2D主终端中的各组成部分中：
处理器 62， 用于通过收发器 61对用于传输同步信号的时频资源集进行测 量， 并向网络设备上报所述测量模块的测量结果； 通过收发器 61接收所述网 络设备根据所述测量结果为所述 D2D主终端分配的同步资源； 以及， 根据所 述为所述 D2D主终端分配的同步资源， 并通过收发器 61发送同步信号。
在一种可能的实现方式中， 处理器 62可根据预先设置于所述 D2D主终端 的用于传输同步信号的时频资源集， 并通过收发器 61进行测量； 或者， 通过 收发器 61从所述网络设备发送的广播消息中获取用于传输同步信号的时频资 源集， 并根据获取到的时频资源集， 通过收发器 61进行测量。
在一种可能的实现方式中， 处理器 62可在发起网络接入并接入网络后， 通过收发器 61向所述网络设备上报所述测量结杲； 其中， 所述 D2D终端的网 络接入模块在网络接入过程中上报接入原因和终端类型， 所述接入原因为测 量上报， 所述终端类型为 D2D主终端。
在一种可能的实现方式中， 同步资源包括用于传输同步信号的时频资源。 相应的， 处理器 62可在收发器 61接收到所述网络设备为所述 D2D主终端分配 的用于传输同步信号的时频资源后立即通过收发器 61在所述分配的用于传输 同步信号的时频资源位置上发送同步信号； 或者， 通过收发器 61在接收到所 述网络设备为所述 D2D主终端分配的用于传输同步信号的时频资源后， 在通 过收发器 61接收到所述网絡设备发送的同步指示时， 通过收发器 61在所述分 配的用于传输同步信号的时频资源位置上发送同步信号； 其中， 所述同步指 示是所述网络设备在获知与所述 D2D终端对应的 D2D从终端接入网络时发送 的。
在一种可能的实现方式中， 所述同步资源还包括用于传输同步反馈信息 的时频资源。 相应的， 处理器 61还可根据所述用于传输同步反馈信息的时频 资源，通过收发器 61接收与所述 D2D主终端对应的 D2D从终端发送的同步反馈 信息， 并当接收到的同步反馈信息为降低功率指示时， 降低收发器 61的同步 信号的发送功率。
在一种可能的实现方式中 , 处理器 62可在与所述 D2D主终端对应的 D2D 从终端的数量为至少 2个的情况下， 在通过收发器 61接收到与所述 D2D主终端 对应的所有 D2D从终端发送的降低功率指示后， 降低收发器 61的同步信号的 发送功率。
参见图 7A， 为本发明另一实施例提供的 D2D终端的结构示意图， 该 D2D 终端为 D2D从终端 （DS-UE ) 。 如图 7A所示， 该 D2D终端可包括： 该 D2D终 端的上述功能模块的主要功能可包括： 同步资源配置模块 701、 同步信号传输 模块 702、 同步模块 703 , 该 D2D终端还包括网络接入模块（未在图中示出） 。 该 D2D终端的各功能模块的主要功能可包括：
同步资源配置模块 701 , 用于获取与所述 D2D从终端对应的 D2D主终端的 同步资源， 所述同步资源中包括用于传输同步信号的时频资源；
同步信号传输模块 702， 用于根据同步资源配置模块 701获取到的所述同 步资源中用于传输同步信号的时频资源， 接收与所述 D2D从终端对应的 D2D 主终端发送的同步信号；
同步模块 703 , 用于根据接收到的同步信号与所述 D2D从终端对应的 D2D 主终端进行同步。
在一种可能的实现方式中， 同步资源配置模块 701可根据预先设置于所述 D2D从终端的用于传输同步信号的时频资源集进行信号搜索， 当搜索到的信 号中所携带的终端标识为所述 D2D从终端对应的 D2D主终端的标识时，将当前 用于传输同步信号的时频资源； 或者， 接收网络设备通知的与所述 D2D从终 端对应的 D2D主终端的同步资源， 所述同步资源是所述网络设备根据与所述 D2D从终端对应的 D2D主终端上报的测量结果为所述 D2D主终端分配的，所述 测量结果是对用于传输同步信号的时频资源集进行测量的结果。
在一种可能的实现方式中， 同步资源配置模块 701可在所述 D2D从终端发 起网络接入并接入网络后， 接收所述网络设备通知的与所述 D2D从终端对应 的 D2D主终端的同步资源； 其中， 所述 D2D从终端的网络接入模块在网络接入 过程中上报终端类型， 所述终端类型为 D2D从终端； 同步资源配置模块 701还 可在接收到所述网络设备通知的与所述 D2D从终端对应的 D2D主终端的同步 资源后， 指示所述 D2D终端的网络接入模块发起与所述网络设备间的链路的 释放过程。
在一种可能的实现方式中， 所述同步资源中还包括用于传输同步反馈信 息的时频资源。 相应的， 同步信号传输模块 702还可根据所述用于传输同步反 息。
在一种可能的实现方式中， 同步信号传输模块 702可在接收到的与所述 D2D从终端对应的 D2D主终端发送的同步信号的强度超过设定门限时，向与所 述 D2D从终端对应的 D2D主终端发送降低功率指示，所述降低功率指示用于指 示 D2D主终端降低同步信号发送功率； 或者， 在根据接收到的同步信号与所 述 D2D从终端对应的 D2D主终端完成同步后，向与所述 D2D从终端对应的 D2D 主终端发送同步确认指示。
参见图 7B, 为本发明实施例提供的配置为 D2D从终端 （DS-UE ) 的 D2D 终端的硬件结构示意图。 如图所示， 该 D2D终端可包括： 收发器 71、 处理器 72, 还可进一步包括存储器 73.处理器 72可实现同步资源配置功能 721、 同步信 号传输功能 722和同步功能 723。 该 D2D终端的各组成部分中：
处理器 72，用于通过收发器 71获取与所述 D2D从终端对应的 D2D主终端的 同步资源， 所述同步资源中包括用于传输同步信号的时频资源； 根据获取到 的所述同步资源中用于传输同步信号的时频资源， 通过收发器 71接收与所述 D2D从终端对应的 D2D主终端发送的同步信号；以及，根据接收到的同步信号， 在一种可能的实现方式中， 处理器 72可通过收发器 71 , 根据预先设置于 所述 D2D从终端的用于传输同步信号的时频资源集进行信号搜索， 当搜索到 的信号中所携带的终端标识为所述 D2D从终端对应的 D2D主终端的标识时，将 当前搜索到的信号所使用的时频资源确定为与所述 D2D从终端对应的 D2D主 终端用于传输同步信号的时频资源； 或者， 通过收发器 71接收网络设备通知 的与所述 D2D从终端对应的 D2D主终端的同步资源，所述同步资源是所述网絡 设备根据与所述 D2D从终端对应的 D2D主终端上报的测量结果为所述 D2D主 终端分配的， 所述测量结果是对用于传输同步信号的时频资源集进行测量的 结果。
在一种可能的实现方式中 , 处理器 72可在所述 D2D从终端发起网络接入 并接入网络后， 通过收发器 71接收所述网络设备通知的与所述 D2D从终端对 应的 D2D主终端的同步资源； 其中， 所述 D2D从终端的网络接入模块在网络接 入过程中上报终端类型， 所述终端类型为 D2D从终端。 处理器 72还可在通过 收发器 71接收到所述网络设备通知的与所述 D2D从终端对应的 D2D主终端的 同步资源后， 指示所述 D2D终端的网络接入模块发起与所述网络设备间的链 路的释放过程。
在一种可能的实现方式中， 所述同步资源中还包括用于传输同步反馈信 息的时频资源。 相应的， 处理器 72可根据所述用于传输同步反馈信息的时频 资源， 通过收发器 71向与所述 D2D从终端对应的 D2D主终端发送同步反馈信 息。
在一种可能的实现方式中， 处理器 72可在通过收发器 71接收到的与所述 D2D从终端对应的 D2D主终端发送的同步信号的强度超过设定门限时，向与所 述 D2D从终端对应的 D2D主终端发送降低功率指示，所述降低功率指示用于指 示 D2D主终端降低同步信号发送功率； 或者， 在根据所述收发器接收到的同 述 D2D从终端对应的 D2D主终端发送同步确认指示。
参见图 8A, 为本发明实施例提供的网络设备的结构示意图。 在 LTE系统 中， 该网络设备可以是上述实施例中的 eNB。 对于其它无线通信系统， 该网络 设备可以是实现类似 e B的功能的网络接入设备。 如图 8A所示， 该网络设备 可包括： 接收模块 801、 同步资源分配模块 803、 通知模块 803。 该网络设备的 上述功能模块的主要功能可包括：
接收模块 801 , 用于接收 D2D主终端上报的用于传输同步信号的时频资源 集的测量结果；
同步资源分配模块 802, 用于根据所述接收模块接收到的所述测量结果为 所述 D2D主终端分配同步资源；
通知模块 803， 用于将所述同步资源分配模块为所述 D2D主终端分配的同 步资源通知给所述 D2D主终端。
在一种可能的实现方式中， 通知模块 803还可将为所述 D2D主终端分配的 同步资源通知给所述 D2D主终端对应的 D2D从终端。
在一种可能的实现方式中， 通知模块 803还可在获知与所述 D2D主终端对 应的 D2D从终端接入网络后， 通知所述 D2D主终端发送同步信号。
在一种可能的实现方式中， 通知模块 803还可在接收到所述 D2D主终端对 应的 D2D从终端发送的用于通知该 D2D从终端已驻留宏小区的消息后，指示所 述 D2D主终端停止发送同步信号。
在一种可能的实现方式中， 所述同步资源包括： 用于传输同步信号的时 频资源， 或者包括： 用于传输同步信号的时频资源和用于传输同步反馈信息 的时频资源。 本发明的上述实施例中， D2D主终端通过向网络设备上报对用 于传输同步信号的时频资源集进行测量的结果， 使网络设备根据该测量结果 为该 D2D主终端分配同步资源， 从而在该同步资源上发送同步信号， 以实现 D2D终端间的初始同步。 参见图 8B, 为本发明实施例提供的网络设备的硬件结构示意图。 在 LTE 系统中， 该网络设备可以是上述实施例中的 eNB。 对于其它无线通信系统， 该 网络设备可以是实现类似 eNB的功能的网络接入设备。该网络设备可包括收发 器 81、 处理器 82, 还可进一步包括存储器 83。 进一步的， 处理器 82可实现同 步资源分配功能 821和通知功能 822。 该网络设备的各组成部分中：
收发器 81 , 用于接收 D2D主终端上报的用于传输同步信号的时频资源集 的测量结果；
处理器 82, 用于根据收发器 81接收到的所述测量结果为所述 D2D主终端 分配同步资源， 并通过收发器 81将所述同步资源分配模块为所述 D2D主终端 分配的同步资源通知给所述 D2D主终端。
在一种可能的实现方式中， 处理器 82可通过收发器 81将为所述 D2D主终 端分配的同步资源通知给所述 D2D主终端对应的 D2D从终端。
在一种可能的实现方式中， 处理器 81还可在获知与所述 D2D主终端对应 的 D2D从终端接入网络后， 通过收发器 81通知所述 D2D主终端发送同步信号。
在一种可能的实现方式中， 处理器 82还可在通过收发器 81接收到所述 D2D主终端对应的 D2D从终端发送的用于通知该 D2D从终端已驻留宏小区的 消息后， 通过收发器 81指示所述 D2D主终端停止发送同步信号。
在一种可能的实现方式中， 所述同步资源包括： 用于传输同步信号的时 频资源， 或者包括： 用于传输同步信号的时频资源和用于传输同步反馈信息 的时频资源。
本领域内的技术人员应明白， 本发明的实施例可提供为方法、 系统、 或 计算机程序产品。 因此， 本发明可采用完全硬件实施例、 完全软件实施例、 或结合软件和硬件方面的实施例的形式。 而且， 本发明可采用在一个或多个 其中包含有计算机可用程序代码的计算机可用存储介质 (包括但不限于磁盘 存储器、 CD-ROM、 光学存储器等） 上实施的计算机程序产品的形式。
本发明是参照根据本发明实施例的方法、 设备（系统） 、 和计算机程序 产品的流程图和 /或方框图来描述的。 应理解可由计算机程序指令实现流程 图和 /或方框图中的每一流程和 /或方框、 以及流程图和 /或方框图中的流 程和 /或方框的结合。 可提供这些计算机程序指令到通用计算机、 专用计算 机、 嵌入式处理机或其他可编程数据处理设备的处理器以产生一个机器， 使 得通过计算机或其他可编程数据处理设备的处理器执行的指令产生用于实现 在流程图一个流程或多个流程和 /或方框图一个方框或多个方框中指定的功 能的装置。
这些计算机程序指令也可存储在能引导计算机或其他可编程数据处理设 备以特定方式工作的计算机可读存储器中， 使得存储在该计算机可读存储器 中的指令产生包括指令装置的制造品， 该指令装置实现在流程图一个流程或 多个流程和 /或方框图一个方框或多个方框中指定的功能。
这些计算机程序指令也可装载到计算机或其他可编程数据处理设备上， 使得在计算机或其他可编程设备上执行一系列操作步骤以产生计算机实现的 处理， 从而在计算机或其他可编程设备上执行的指令提供用于实现在流程图 一个流程或多个流程和 /或方框图一个方框或多个方框中指定的功能的步 骤。
尽管已描述了本发明的优选实施例， 但本领域内的技术人员一旦得知了 基本创造性概念， 则可对这些实施例作出另外的变更和修改。 所以， 所附权 利要求意欲解释为包括优选实施例以及落入本发明范围的所有变更和修改。
显然， 本领域的技术人员可以对本发明实施例进行各种改动和变型而不 脱离本发明实施例的精神和范围。 这样， 倘若本发明实施例的这些修改和变 型属于本发明权利要求及其等同技术的范围之内， 则本发明也意图包含这些 改动和变型在内。

Claims

权 利 要 求
1、 一种设备到设备 D2D终端间的初始同步方法， 其特征在于， 所述方法 包括：
D2D主终端对用于传输同步信号的时频资源集进行测量， 并向网络设备 上报测量结果；
所述 D2D主终端接收所述网络设备根据所述 D2D主终端上报的测量结果 为所述 D2D主终端分配的同步资源；
所述 D2D主终端根据为所述 D2D主终端分配的同步资源发送同步信号。
2、 如权利要求 1所述的方法， 其特征在于， 所述 D2D主终端对用于传输 同步信号的时频资源集进行测量， 包括：
所述 D2D主终端根据预先设置于所述 D2D主终端的用于传输同步信号的 时频资源集进行测量； 或者
所述 D2D主终端从所述网络设备发送的广播消息中获取用于传输同步信 号的时频资源集， 并根据获取到的时频资源集进行测量。
3、 如权利要求 1所述的方法， 其特征在于， 所述 D2D主终端在发起网络 接入并接入网络后， 向所述网络设备上报所述测量结果； 其中， 所述 D2D主 终端在网络接入过程中上报接入原因和终端类型， 所述接入原因为测量上报， 所述终端类型为 D2D主终端。
4、 如权利要求 1-3中任一项所述的方法， 其特征在于， 所述同步资源包括 用于传输同步信号的时频资源； 括：
所述 D2D终端接收到所述网络设备为所述 D2D主终端分配的用于传输同 步信号的时频资源后立即在所述分配的用于传输同步信号的时频资源位置上 发送同步信号； 或者
所述 D2D终端接收到所述网絡设备为所述 D2D主终端分配的用于传输同 步信号的时频资源后， 在接收到所述网络设备发送的同步指示时， 在所述分 配的用于传输同步信号的时频资源位置上发送同步信号； 其中， 所述同步指 示是所述网络设备在获知与所述 D2D终端对应的 D2D从终端接入网络时发送 的。
5、 如权利要求 4所述的方法， 其特征在于， 所述同步资源还包括用于传 输同步反馈信息的时频资源； 所述方法还包括：
所述 D2D主终端根据所述用于传输同步反馈信息的时频资源， 接收与所 述 D2D主终端对应的 D2D从终端发送的同步反馈信息，并当接收到的同步反馈 信息为降低功率指示时， 降低同步信号的发送功率。
6、 如权利要求 5所述的方法， 其特征在于， 若与所述 D2D主终端对应的 D2D从终端的数量为至少 2个， 则所述 D2D主终端在接收到与所述 D2D主终端 对应的所有 D2D从终端发送的降低功率指示后， 降低同步信号的发送功率。
7、 一种设备到设备 D2D终端间的初步同步方法， 其特征在于， 所述方法 包括：
D2D从终端获取与所述 D2D从终端对应的 D2D主终端的同步资源，所述同 步资源中包括用于传输同步信号的时频资源；
所述 D2D从终端根据获取到的所述同步资源中用于传输同步信号的时频 资源， 接收与所述 D2D从终端对应的 D2D主终端发送的同步信号；
所述 D2D从终端根据接收到的同步信号与所述 D2D从终端对应的 D2D主 终端进行同步。
8、 如权利要求 7所述的方法， 其特征在于， 所述 D2D从终端获取与所述 D2D从终端对应的 D2D主终端的同步资源， 包括：
所述 D2D从终端根据预先设置于所述 D2D从终端的用于传输同步信号的 时频资源集进行信号搜索， 当搜索到的信号中所携带的终端标识为所述 D2D 从终端对应的 D2D主终端的标识时， 将当前搜索到的信号所使用的时频资源 确定为与所述 D2D从终端对应的 D2D主终端用于传输同步信号的时频资源；或 者 所述 D2D从终端接收网络设备通知的与所述 D2D从终端对应的 D2D主终 端的同步资源， 所述同步资源是所述网络设备根据与所述 D2D从终端对应的 D2D主终端上报的测量结果为所述 D2D主终端分配的，所述测量结果是对用于 传输同步信号的时频资源集进行测量的结果。
9、 如权利要求 8所述的方法， 其特征在于， 所述 D2D从终端在发起网络 接入并接入网络后， 接收所述网絡设备通知的与所述 D2D从终端对应的 D2D 主终端的同步资源； 其中， 所述 D2D从终端在网络接入过程中上报终端类型， 所述终端类型为 D2D从终端；
所述方法还包括：所述 D2D从终端接收到所述网络设备通知的与所述 D2D 从终端对应的 D2D主终端的同步资源后 , 发起与所述网络设备间的链路的释 放过程。
10、 如权利要求 7-9中任一项所述的方法， 其特征在于， 所述同步资源中 还包括用于传输同步反馈信息的时频资源， 所述方法还包括：
所述 D2D从终端根据所述用于传输同步反馈信息的时频资源， 向与所述 D2D从终端对应的 D2D主终端发送同步反馈信息。
11、 如权利要求 10所述的方法， 其特征在于， 所述向与所述 D2D从终端 对应的 D2D主终端发送同步反馈信息， 包括：
若所述 D2D从终端接收到的与所述 D2D从终端对应的 D2D主终端发送的 同步信号的强度超过设定门限，则向与所述 D2D从终端对应的 D2D主终端发送 降低功率指示， 所述降低功率指示用于指示 D2D主终端降低同步信号发送功 率； 或者
若所述 D2D从终端根据接收到的同步信号与所述 D2D从终端对应的 D2D 主终端完成同步， 则向与所述 D2D从终端对应的 D2D主终端发送同步确认指 示。
12、 一种设备到设备 D2D终端间的初步同步方法， 其特征在于， 所述方 法包括：
网络设备接收 D2D主终端上报的用于传输同步信号的时频资源集的测量 结果；
所述网络设备根据所述测量结果为所述 D2D主终端分配同步资源； 所述网络设备将为所述 D2D主终端分配的同步资源通知给所述 D2D主终 端
13、 如权利要求 12所述的方法， 其特征在于， 所述方法还包括： 所述网络设备将为所述 D2D主终端分配的同步资源通知给所述 D2D主终 端对应的 D2D从终端。
14、 如权利要求 12所述的方法， 其特征在于， 所述方法还包括： 所述网絡设备在获知与所述 D2D主终端对应的 D2D从终端接入网络后，通 知所述 D2D主终端发送同步信号。
15、 如权利要求 12所述的方法， 其特征在于， 所述网络设备接收到所述 D2D主终端对应的 D2D从终端发送的用于通知该 D2D从终端已驻留宏小区的 消息后， 指示所述 D2D主终端停止发送同步信号。
16、 如权利要求 12-15任一项所述的方法， 其特征在于， 所述同步资源包 括： 用于传输同步信号的时频资源， 或者包括： 用于传输同步信号的时频资 源和用于传输同步反馈信息的时频资源。
17、 一种设备到设备 D2D终端， 其特征在于， 包括：
测量模块， 用于对用于传输同步信号的时频资源集进行测量， 并向网络 设备上报所述测量模块的测量结果；
同步资源配置模块， 用于接收所述网络设备根据所述测量模块测量并上 艮的测量结果为所述 D2D主终端分配的同步资源；
同步信号传输模块， 用于根据所述同步资源配置模块接收到的所述为所 述 D2D主终端分配的同步资源发送同步信号。
18、 如权利要求 17所述的 D2D终端， 其特征在于， 所述测量模块具体用 于， 根据预先设置于所述 D2D主终端的用于传输同步信号的时频资源集进行 测量； 或者， 从所述网络设备发送的广播消息中获取用于传输同步信号的时 频资源集 , 并根据获取到的时频资源集进行测量。
19、 如权利要求 17所述的 D2D终端， 其特征在于， 所述测量模块具体用 于， 在发起网络接入并接入网絡后， 向所述网络设备上报所述测量结果； 其 中， 所述 D2D终端的网络接入模块在网络接入过程中上报接入原因和终端类 型， 所述接入原因为测量上报， 所述终端类型为 D2D主终端。
20、 如权利要求 17-19中任一项所述的 D2D终端， 其特征在于， 所述同步 资源包括用于传输同步信号的时频资源；
同步信号传输模块具体用于， 在所述同步资源配置模块接收到所述网络 设备为所述 D2D主终端分配的用于传输同步信号的时频资源后立即在所述分 配的用于传输同步信号的时频资源位置上发送同步信号； 或者， 在接收到所 述网络设备为所述 D2D主终端分配的用于传输同步信号的时频资源后 , 在接 收到所述网络设备发送的同步指示时， 在所述分配的用于传输同步信号的时 频资源位置上发送同步信号； 其中， 所述同步指示是所述网络设备在获知与 所述 D2D终端对应的 D2D从终端接入网络时发送的。
21、 如权利要求 20所述的 D2D终端， 其特征在于， 所述同步资源还包括 用于传输同步反馈信息的时频资源；
所述同步信号传输模块还用于， 根据所述用于传输同步反馈信息的时频 资源，接收与所述 D2D主终端对应的 D2D从终端发送的同步反馈信息， 并当接 收到的同步反馈信息为降低功率指示时， 降低同步信号的发送功率。
22、 如权利要求 21所述的 D2D终端， 其特征在于， 所述同步信号传输模 块具体用于 , 在与所述 D2D主终端对应的 D2D从终端的数量为至少 2个的情况 后， 降低同步信号的发送功率。
23、 一种设备到设备 D2D终端， 其特征在于， 包括： 资源， 所述同步资源中包括用于传输同步信号的时频资源；
同步信号传输模块， 用于根据所述同步资源配置模块获取到的所述同步 资源中用于传输同步信号的时频资源 ,接收与所述 D2D从终端对应的 D2D主终 端发送的同步信号；
同步模块，用于根据接收到的同步信号与所述 D2D从终端对应的 D2D主终 端进行同步。
24、 如权利要求 23所述的 D2D终端， 其特征在于， 所述同步资源配置模 块具体用于， 根据预先设置于所述 D2D从终端的用于传输同步信号的时频资 源集进行信号搜索， 当搜索到的信号中所携带的终端标识为所述 D2D从终端 对应的 D2D主终端的标识时， 将当前搜索到的信号所使用的时频资源确定为 与所述 D2D从终端对应的 D2D主终端用于传输同步信号的时频资源； 或者，接 收网络设备通知的与所述 D2D从终端对应的 D2D主终端的同步资源，所述同步 资源是所述网络设备根据与所述 D2D从终端对应的 D2D主终端上报的测量结 果为所述 D2D主终端分配的， 所述测量结果是对用于传输同步信号的时频资 源集进行测量的结果。
25、 如权利要求 24所述的 D2D终端， 其特征在于， 所述同步资源配置模 块具体用于， 在所述 D2D从终端发起网絡接入并接入网络后， 接收所述网络 从终端的网络接入模块在网络接入过程中上报终端类型， 所述终端类型为 D2D从终端；
所述同步资源配置模块还用于， 在接收到所述网络设备通知的与所述 D2D从终端对应的 D2D主终端的同步资源后，指示所述 D2D终端的网络接入模 块发起与所述网络设备间的链路的释放过程。
26、 如权利要求 23-25中任一项所述的 D2D终端， 其特征在于， 所述同步 资源中还包括用于传输同步反馈信息的时频资源；
所述同步信号传输模块还用于， 根据所述用于传输同步反馈信息的时频 资源， 向与所述 D2D从终端对应的 D2D主终端发送同步反馈信息。
27、 如权利要求 26所述的 D2D终端， 其特征在于， 所述同步信号传输模 块具体用于，在接收到的与所述 D2D从终端对应的 D2D主终端发送的同步信号 的强度超过设定门限时，向与所述 D2D从终端对应的 D2D主终端发送降低功率 指示， 所述降低功率指示用于指示 D2D主终端降低同步信号发送功率； 或者， 与所述 D2D从终端对应的 D2D主终端发送同步确认指示。
28、 一种网络设备， 其特征在于， 包括：
接收模块， 用于接收 D2D主终端上报的用于传输同步信号的时频资源集 的测量结果；
同步资源分配模块， 用于根据所述接收模块接收到的所述测量结果为所 述 D2D主终端分配同步资源；
通知模块， 用于将所述同步资源分配模块为所述 D2D主终端分配的同步 资源通知给所述 D2D主终端。
29、 如权利要求 28所述的网络设备， 其特征在于， 所述通知模块还用于， 将为所述 D2D主终端分配的同步资源通知给所述 D2D主终端对应的 D2D从终 端。
30、 如权利要求 28所述的网络设备， 其特征在于， 所述通知模块还用于， 在获知与所述 D2D主终端对应的 D2D从终端接入网络后，通知所述 D2D主终端 发送同步信号。
31、 如权利要求 28所述的网络设备， 其特征在于， 所述通知模块还用于， 在接收到所述 D2D主终端对应的 D2D从终端发送的用于通知该 D2D从终端已 驻留宏小区的消息后， 指示所述 D2D主终端停止发送同步信号。
32、 如权利要求 28-31任一项所述的网络设备， 其特征在于， 所述同步资 源包括： 用于传输同步信号的时频资源， 或者包括： 用于传输同步信号的时 频资源和用于传输同步反馈信息的时频资源。
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