WO2015101218A1 - 设备到设备通信的数据传输方法及装置 - Google Patents

设备到设备通信的数据传输方法及装置 Download PDF

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Publication number
WO2015101218A1
WO2015101218A1 PCT/CN2014/095082 CN2014095082W WO2015101218A1 WO 2015101218 A1 WO2015101218 A1 WO 2015101218A1 CN 2014095082 W CN2014095082 W CN 2014095082W WO 2015101218 A1 WO2015101218 A1 WO 2015101218A1
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communication target
resource
communication
resource allocation
bsr
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PCT/CN2014/095082
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English (en)
French (fr)
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赵亚利
曾二林
傅婧
许芳丽
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电信科学技术研究院
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Priority to US15/107,873 priority Critical patent/US10834627B2/en
Priority to KR1020167021064A priority patent/KR101833842B1/ko
Priority to JP2016544413A priority patent/JP6345792B2/ja
Priority to EP14875923.6A priority patent/EP3091803B1/en
Publication of WO2015101218A1 publication Critical patent/WO2015101218A1/zh

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W28/00—Network traffic management; Network resource management
    • H04W28/02—Traffic management, e.g. flow control or congestion control
    • H04W28/06—Optimizing the usage of the radio link, e.g. header compression, information sizing, discarding information
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/30—Resource management for broadcast services
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W28/00—Network traffic management; Network resource management
    • H04W28/02—Traffic management, e.g. flow control or congestion control
    • H04W28/0278—Traffic management, e.g. flow control or congestion control using buffer status reports
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W4/00—Services specially adapted for wireless communication networks; Facilities therefor
    • H04W4/06—Selective distribution of broadcast services, e.g. multimedia broadcast multicast service [MBMS]; Services to user groups; One-way selective calling services
    • H04W4/08—User group management
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/20—Control channels or signalling for resource management
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/50—Allocation or scheduling criteria for wireless resources
    • H04W72/51—Allocation or scheduling criteria for wireless resources based on terminal or device properties
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W76/00—Connection management
    • H04W76/10—Connection setup
    • H04W76/14—Direct-mode setup
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
    • H04W52/02—Power saving arrangements
    • H04W52/0209—Power saving arrangements in terminal devices
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/04—Wireless resource allocation
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W76/00—Connection management
    • H04W76/10—Connection setup
    • H04W76/11—Allocation or use of connection identifiers
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
    • Y02D30/00—Reducing energy consumption in communication networks
    • Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks

Definitions

  • the present invention relates to the field of mobile communications, and in particular to a data transmission method and apparatus for device-to-device communication.
  • the data is transmitted and received in a centralized manner. That is, the uplink and downlink data of the user equipment UE are transmitted and received under the control of the network.
  • the communication between the UE and the UE is forwarded and controlled by the network. There is no direct communication link between the UE and the UE.
  • the data transmission between the UE and the network can be referred to as D2N (Device to Network, device). To the network) transmission.
  • D2N Device to Network, device
  • the BSR (Buffer State Reporting) mechanism in the LTE D2N communication system is as follows:
  • the LTE system is a scheduling-based system.
  • the base station allocates time-frequency resources required for data transmission to the terminal device, and the terminal performs downlink data reception or uplink data transmission according to the scheduling command of the base station.
  • the uplink data transmission is scheduled by the base station, and the base station scheduler notifies the terminal through the UL grant (uplink scheduling permission) after determining the uplink resource allocation situation.
  • the basis for the uplink resource allocation by the base station scheduler is the amount of uplink data to be sent by the terminal, that is, the buffer status of the terminal.
  • the buffer is on the terminal side. If the base station wants to know the information, the terminal needs to perform a BSR (Buffer state report) to the base station.
  • BSR Buffer state report
  • the parameters configured by the RRC layer for the BSR in the LTE system include the following two timers, both of which are based on the UE.
  • retxBSR-Timer Disables the timer reported by the BSR.
  • PeriodBSR-Timer The timer reported by the periodic BSR.
  • Regular BSR Regular BSR: (1) Triggered when there is data with higher priority than the data in the current buffer or if there is data in the originally empty buffer; (2) retxBSR-Timer times out and there is data in the buffer Triggered when.
  • Periodic BSR Periodic BSR is triggered when the periodBSR-Timer times out.
  • Padding BSR If the UE is in the process of organizing the MAC PDU, in addition to the data to be transmitted, there is a resource available (padding), which can trigger the Padding BSR.
  • LCG logical channel group
  • the padding BSR For the padding BSR, if the number of padding bits is greater than or equal to (short BSR+MAC subheader) but less than (long BSR+MAC subheader), if the UE has more than one LCG with data available, the truncated BSR is reported, otherwise the short BSR is reported; If the padding bit is greater than or equal to (long BSR+MAC subheader), the long BSR is reported;
  • both the periodic BSR and the Padding BSR can be reported when the uplink resource is available.
  • the regular BSR triggers the SR (Scheduling Request) process when the uplink resource is available, and requests the base station to allocate uplink resources to the UE.
  • the base station After the base station allocates the uplink resource to the UE, if the resource is just enough to send all the uplink data, the base station may send the uplink data without sending the BSR; if the resource is insufficient to send all the uplink data, the regular BSR or the periodic BSR is preferentially reported, and the base station according to the BSR The uplink data amount required by the reported UE is used for subsequent transmission scheduling.
  • a MAC PDU contains at most one BSR.
  • Regular BSR and Periodic BSR the content of all available data in the UE buffer is included because the content of the report is the same. , the reporting format is exactly the same, you can choose one of the reports.
  • the MAC layer organizes the MAC PDU, the two types of MAC CEs are preferentially placed, and then the MAC SDU is placed.
  • the padding BSR has a lower priority than the data.
  • the padding BSR and the regular/periodic BSR can be reported on different MAC PDUs in the same subframe.
  • the BSR is reported in the form of a MAC CE (Control Element).
  • the BSR is divided into a MAC sub-header and a MAC CE.
  • the BSR MAC CE includes the long BSR and the short BSR.
  • the format of the truncated BSR and the short BSR are the same.
  • the format of the MAC subheader and the BSR MAC CE in the LTE system is shown in Figure 1, Figure 2, and Figure 3.
  • LCID Logical Channel ID: A logical channel number used to identify the corresponding load part.
  • the long BSR, short BSR, and truncated BSR each have an LCID.
  • R Reserved, reserved: reserved bits.
  • LCG ID Logical channel group number. In the LTE system, four logical channel groups are divided when reporting BSR.
  • Buffer Size The amount of data buffer in the corresponding logical channel group.
  • the difference between the R10/11 version and the R8/9 version is that the R10/11 version introduces a new BS table due to support for carrier aggregation and peak rate increase.
  • the R1/11-capable UE reports the BSR whether to use the new BS table is configured by the base station through RRC signaling.
  • Both the BS table of R8/9 and the BS table of R10/11 are 64-level quantization, that is, the corresponding quantized value can be represented by 6 bits, so the buffer size of each LCG in the above BSR MAC CE format is 6 bits.
  • Direct D2D communication (device-to-device communication) is allowed between devices and devices that are close together.
  • a link that defines direct communication between D2D terminals is called a D2D (Device to Device) link
  • a cellular communication link between the network and the D2D terminal is called a Device to Network (D2N). Network) link.
  • D2D Device to Device
  • D2N Device to Network
  • the devices of D2D Communication can also be in the network, or both are off-net, or some devices are in the network, and some devices are off-network.
  • the device that participates in D2D Communication on the network is located in the coverage of the 3GPP network and uses the spectrum resources of the 3GPP network.
  • the so-called off-network that is, the device participating in D2D Communication is not covered by the 3GPP network or although it is within the coverage of the 3GPP network, D2D Communication dedicated spectrum resources.
  • a typical D2D communication scenario includes the following three types: one-to-one communication between D2D UEs; one device transmits the same data (group communication) to all devices in one communication group through a single transmission; one device transmits through a single transmission. Send the same data (broadcast communication) to all nearby devices;
  • one-to-one communication between D2D UEs is mainly used for social applications, and group/broadcast communication scenarios are mainly used for fire protection, rescue, and anti-terrorism in public safety applications.
  • the UE listens to the resources in the resource pool to see if there are any idle resources. If so, you can select the idle resources for D2D Communication. In this way, different UEs may select the same D2D Communication resource, and thus there is a problem of collision.
  • Centralized resource allocation introduces a resource allocation control node to manage the D2D Communication resource allocation of a specific scope (such as a group or a cell).
  • the base station is generally selected as the resource allocation control node.
  • a device is selected as the centralized control node for resource allocation.
  • the device is generally called CH (Cluster Header).
  • D2D devices are generally considered to support parallel D2D communication, that is, a D2D device can perform D2D communication with multiple D2D communication targets at the same time.
  • a D2D device can perform D2D communication with multiple D2D communication targets at the same time.
  • the Communication device does not need to perform unnecessary blind detection. Therefore, it is necessary to propose a device-to-device communication data transmission technology to ensure that the MAC PDU overhead is small and the D2D Communication device is not required to perform unnecessary blind detection.
  • the present invention provides a device-to-device communication data transmission method and apparatus, which can prevent data of one device to different target devices from being multiplexed in one MAC PDU, thereby reducing MAC PDU.
  • Head overhead ensures that the device at the receiving end of the D2D Communication does not need to perform unnecessary blind detection to achieve power saving.
  • a data transmission method for device-to-device communication is provided.
  • the data transmission method of the device to device communication includes:
  • the device-to-device communication data transmission method further includes: configuring a corresponding D2D communication target identifier for the D2D communication target in advance; and carrying the D2D communication target identifier in the MAC PDU in the MAC PDU or the MAC PDU in the MAC PDU.
  • Medium Media Access Control Service Data Unit in MAC SDU
  • the D2D communication target identifier includes at least one of the following: a group identifier, a broadcast identifier, a target terminal identifier, and a radio bearer RB identifier.
  • the BSR information is reported in the D2D buffer state corresponding to each D2D communication target reported by the UE that is sent by the UE at the time of the allocation of the corresponding resource for each D2D communication target; and the D2D communication is determined according to the D2D BSR information.
  • the target allocates the corresponding resource; at the same time, according to the determined resource allocated for each D2D communication target, the resource allocation information is generated, and the resource allocation information is sent to the UE at the transmitting end, and the UE at the transmitting end is determined to be each according to the resource allocation information.
  • the D2D communication target allocates resources.
  • the resource allocation information includes a D2D communication target identifier corresponding to each D2D communication target, and a resource corresponding to each D2D communication target.
  • the UE at the transmitting end reports the BSR information corresponding to each D2D communication target by means of independent reporting or unified reporting.
  • the triggering condition for the UE of the transmitting end to report the D2D BSR information corresponding to the D2D communication target includes at least one of the following: the D2D buffer of the D2D communication target has a higher priority than the current data; the D2D corresponding to the D2D communication target The buffer is originally empty, but new data arrives; the D2DBSR cycle timer of the D2D communication target times out; when the MAC PDU is generated for the D2D communication target, the resource corresponding to the D2D communication target contains resources required for the D2D data to be transmitted. Available resources other than .
  • the D2D BSR information includes a D2D communication target identifier corresponding to the D2D communication target and a buffer status BS information of the D2D buffer corresponding to the D2D communication target.
  • the corresponding resource pool allocates corresponding resources for each D2D communication target.
  • the priority of each D2D radio bearer RB corresponding to the D2D communication target may be determined. And sorting according to the D2D RB priority from high to low, generating a D2D RB priority queue corresponding to the D2D communication target; and corresponding to the D2D communication target according to the D2D RB priority queue
  • the resource allocates resources, and generates a MAC PDU corresponding to the D2D communication target according to the allocation result of the resource allocation.
  • the resource allocation corresponding to the D2D communication target resource according to the D2D RB priority queue, and the MAC PDU corresponding to the D2D communication target is generated according to the resource allocation allocation result, and the D2D communication can be performed according to the D2DRB priority queue.
  • Each D2D RB corresponding to the target performs resource allocation according to the prioritized bit rate PBR; and after performing resource allocation, if there is no remaining resource, determining, according to the resource allocation result, each D2D RB is allocated in the D2D communication target.
  • the resource to which the resource belongs, and the corresponding MAC PDU is organized for the D2D communication target according to the resource.
  • resource allocation is performed on resources corresponding to the D2D communication target, and when a MAC PDU corresponding to the D2D communication target is generated according to the allocation result of the resource allocation, after the resource allocation is performed, if Remaining resources, according to the remaining resources, according to the D2D RB priority queue, resource allocation for each D2D RB corresponding resource corresponding to the D2D communication target, and each D2D in the D2D RB priority queue.
  • the remaining resource allocation is determined to be ended; and after the remaining resource allocation ends, each of the D2D communication targets is determined according to the resource allocation and the allocation result of the remaining resource allocation.
  • the resources to which the D2D RB is allocated and organize the corresponding MAC PDUs for the D2D communication target according to the resources.
  • a device-to-device communication data transmission apparatus is provided.
  • the device-to-device communication data transmission device includes:
  • a determining module configured to determine a device-to-device D2D communication target corresponding to the user equipment UE at the transmitting end;
  • An allocation module configured to allocate a corresponding resource for each D2D communication target
  • a processing module configured to generate, according to resources corresponding to each D2D communication target, a media access control protocol data unit MAC PDU corresponding to the D2D communication target, and send a MAC PDU by using a resource corresponding to the D2D communication target.
  • the device-to-device communication data transmission device further includes: a configuration module, configured to pre-configure a corresponding D2D communication target identifier for the D2D communication target.
  • the processing module is further configured to carry the D2D communication target identifier in a medium access control MAC subheader in the MAC PDU or a medium access control service data unit MAC SDU in the MAC PDU.
  • the D2D communication target identifier includes at least one of the following: a group identifier, a broadcast identifier, a target terminal identifier, and a radio bearer RB identifier.
  • the allocating module may include: a receiving submodule, configured to receive each D2D pass reported by the UE at the transmitting end The D2D buffer status corresponding to the target of the message is reported to the BSR information; the first determining submodule is configured to determine, according to the D2D BSR information, a corresponding resource for each D2D communication target; and the processing submodule is configured to determine according to each The resources allocated by the D2D communication target generate resource allocation information, and send the resource allocation information to the UE at the transmitting end, so that the UE at the transmitting end determines to allocate resources for each D2D communication target according to the resource allocation information.
  • the resource allocation information may include a D2D communication target identifier corresponding to each D2D communication target, and a resource corresponding to each D2D communication target.
  • the UE at the transmitting end reports the BSR information corresponding to each D2D communication target by means of independent reporting or unified reporting.
  • the triggering condition for the UE of the transmitting end to report the D2D BSR information corresponding to the D2D communication target includes at least one of the following: the D2D buffer of the D2D communication target has a higher priority than the current data; the D2D corresponding to the D2D communication target The buffer is originally empty, but new data arrives; the D2DBSR cycle timer of the D2D communication target times out; when the MAC PDU is generated for the D2D communication target, the resource corresponding to the D2D communication target contains resources required for the D2D data to be transmitted. Available resources other than .
  • the D2D BSR information includes a D2D communication target identifier corresponding to the D2D communication target and a buffer status BS information of the D2D buffer corresponding to the D2D communication target.
  • the allocating module may further include: a second determining submodule, configured to determine an amount of data to be sent by each D2D logical channel or logical channel group corresponding to each D2D communication target; and a first allocation submodule for using the data amount And a resource pool corresponding to each D2D communication target, and a corresponding resource is allocated for each D2D communication target.
  • a second determining submodule configured to determine an amount of data to be sent by each D2D logical channel or logical channel group corresponding to each D2D communication target
  • a first allocation submodule for using the data amount And a resource pool corresponding to each D2D communication target, and a corresponding resource is allocated for each D2D communication target.
  • the processing module may include: a third determining submodule, configured to determine a priority of each D2D radio bearer RB corresponding to the D2D communication target, and sort the D2D RB priority according to the D2D RB priority, and generate a D2D communication target corresponding to the D2D communication target.
  • the D2D RB priority queue is configured to generate a resource allocation corresponding to the resource corresponding to the D2D communication target according to the D2D RB priority queue, and generate a MAC PDU corresponding to the D2D communication target according to the allocation result of the resource allocation.
  • the generating sub-module may include: a second allocation sub-module, configured to perform resource allocation according to a prioritized bit rate PBR for each D2D RB corresponding to the D2D communication target according to the D2D RB priority queue; And after the resource allocation, if there is no remaining resources, determining, according to the resource allocation result, the resource allocated by each D2D RB in the D2D communication target, and organizing the corresponding MAC PDU according to the resource as the D2D communication target.
  • a second allocation sub-module configured to perform resource allocation according to a prioritized bit rate PBR for each D2D RB corresponding to the D2D communication target according to the D2D RB priority queue.
  • the generating sub-module may further include: a third allocation sub-module, configured to: after the resource allocation, if there are remaining resources, according to the remaining resources, according to the D2D RB priority queue, each corresponding to the D2D communication target The data of the D2D RB has not been allocated resources, and the resource allocation is performed, and when all the data of each D2DRB in the D2D RB priority queue is allocated to the resource or the remaining resources are allocated, it is determined that the remaining resource allocation ends;
  • the organization sub-module is further configured to: after the end of the remaining resource allocation, determine, according to the resource allocation and the allocation result of the remaining resource allocation, the resource allocated by each D2D RB in the D2D communication target, and organize the D2D communication target according to the resource. Corresponding MAC PDU.
  • the invention separately generates a MAC PDU for each D2D communication target of the UE at the transmitting end, thereby avoiding the situation that data multiplexing of one device to different D2D communication target devices occurs in one MAC PDU, thereby reducing the head overhead of the MAC PDU. Moreover, it also ensures that the device at the receiving end does not need unnecessary blind detection, and achieves the purpose of power saving.
  • FIG. 1 is a schematic diagram of a format of a MAC subheader in an existing LTE system
  • FIG. 2 is a schematic diagram of a short D2D BSR and a truncated D2D BSR MAC CE format in an existing LTE system;
  • FIG. 3 is a schematic diagram of a long D2D BSR format in an existing LTE system
  • FIG. 4 is a flow chart showing a method for data communication from device to device according to an embodiment of the present invention.
  • FIG. 5 is a schematic diagram of a format of a MAC header when D2D BSR information is independently reported based on device triggering according to an embodiment of the present invention
  • FIG. 6 is a schematic diagram of a format of a short D2D BSR MAC CE when the D2D BSR information is independently reported by the device when the D2D BSR information is triggered according to an embodiment of the present invention
  • FIG. 7 is a schematic diagram of a format of a long D2D BSR MAC CE when D2D BSR information is independently reported based on device triggering according to an embodiment of the present invention
  • FIG. 8 is a schematic diagram of a format of a MAC header when D2D BSR information is independently reported when D2D BSR information is triggered based on a D2D communication target according to an embodiment of the present invention
  • FIG. 9 is a schematic diagram of a format of a short D2D BSR MAC CE when D2D BSR information is triggered based on a D2D communication target, and D2D BSR information is independently reported when the D2D BSR information is triggered according to an embodiment of the present invention
  • FIG. 10 is a schematic diagram of a format of a long D2D BSR MAC CE when D2D BSR information is triggered based on a D2D communication target, and D2D BSR information is independently reported when D2D BSR information is triggered according to an embodiment of the present invention
  • FIG. 11 is a schematic diagram of a MAC PDU format according to an embodiment of the present invention.
  • FIG. 12 is a schematic structural diagram of a data transmission apparatus for device-to-device communication according to an embodiment of the present invention.
  • Figure 13 is a block diagram showing an exemplary structure of a computer embodying the technical solution of the present invention.
  • a data transmission method of device-to-device communication is provided.
  • a data transmission method for device-to-device communication includes:
  • Step S401 determining a device-to-device D2D communication target corresponding to the user equipment UE at the transmitting end;
  • Step S403 allocating corresponding resources for each D2D communication target
  • Step S405 Generate a media access control protocol data unit MAC PDU corresponding to the D2D communication target according to the resource corresponding to each D2D communication target, and send the MAC PDU by using the resource corresponding to the D2D communication target.
  • the device-to-device communication data transmission method further includes: configuring a corresponding D2D communication target identifier for the D2D communication target in advance; and carrying the D2D communication target identifier in the MAC PDU in the MAC PDU or the MAC PDU in the MAC PDU.
  • Medium Media Access Control Service Data Unit in MAC SDU
  • the D2D communication target identifier includes at least one of the following: a group identifier, a broadcast identifier, a target terminal identifier, and a radio bearer RB identifier.
  • the BSR information is reported in the D2D buffer state corresponding to each D2D communication target reported by the UE that is sent by the UE at the time of the allocation of the corresponding resource for each D2D communication target; and the D2D communication is determined according to the D2D BSR information.
  • the target allocates the corresponding resource; at the same time, according to the determined resource allocated for each D2D communication target, the resource allocation information is generated, and the resource allocation information is sent to the UE at the transmitting end, and the UE at the transmitting end is determined to be each according to the resource allocation information.
  • the D2D communication target allocates resources.
  • the resource allocation information includes a D2D communication target identifier corresponding to each D2D communication target, and a resource corresponding to each D2D communication target.
  • the UE at the transmitting end reports the D2D BSR information corresponding to each D2D communication target by means of independent reporting or unified reporting.
  • the triggering condition for the UE of the transmitting end to report the D2D BSR information corresponding to the D2D communication target includes at least one of the following: the D2D buffer of the D2D communication target has a higher priority than the current data; the D2D corresponding to the D2D communication target The buffer is originally empty, but new data arrives; the D2DBSR cycle timer of the D2D communication target times out; when the MAC PDU is generated for the D2D communication target, the resource corresponding to the D2D communication target contains resources required for the D2D data to be transmitted. Available resources other than .
  • the D2D BSR information includes a D2D communication target identifier corresponding to the D2D communication target and a buffer status BS information of the D2D buffer corresponding to the D2D communication target.
  • the corresponding resource pool allocates corresponding resources for each D2D communication target.
  • the priority of each D2D radio bearer RB corresponding to the D2D communication target may be determined. And sorting according to the D2D RB priority from high to low, generating a D2D RB priority queue corresponding to the D2D communication target; and performing resource allocation on the resource corresponding to the D2D communication target according to the D2D RB priority queue, and according to the resource allocation As a result of the allocation, a MAC PDU corresponding to the D2D communication target is generated.
  • the resource allocation corresponding to the D2D communication target resource according to the D2D RB priority queue, and the MAC PDU corresponding to the D2D communication target is generated according to the resource allocation allocation result, and the D2D communication can be performed according to the D2DRB priority queue.
  • Each D2D RB corresponding to the target performs resource allocation according to the prioritized bit rate PBR; and after performing resource allocation, if there is no remaining resource, determining, according to the resource allocation result, each D2D RB is allocated in the D2D communication target.
  • the resource to which the resource belongs, and the corresponding MAC PDU is organized for the D2D communication target according to the resource.
  • resource allocation is performed on resources corresponding to the D2D communication target, and when a MAC PDU corresponding to the D2D communication target is generated according to the allocation result of the resource allocation, after the resource allocation is performed, if Remaining resources, according to the remaining resources, according to the D2D RB priority queue, resource allocation for each D2D RB corresponding resource corresponding to the D2D communication target, and each D2D in the D2D RB priority queue
  • Remaining resources according to the remaining resources, according to the D2D RB priority queue, resource allocation for each D2D RB corresponding resource corresponding to the D2D communication target, and each D2D in the D2D RB priority queue
  • the foregoing technical solutions of the present invention determine the D2D Communication resources for different D2D communication targets in the following two ways:
  • the D2D Communication sending device needs to carry the D2D communication target identification information for the BSR when the D2D Communication BSR (Buffer State Report) is sent to the resource allocation control node; the resource allocation control node is based on the D2D reported by the device for each D2D communication target.
  • the BSR information is respectively allocated to the D2D Communication resource, and then the D2D Communication resource allocation result is indicated to the D2D Communication sending device by using the D2D Communication resource allocation indication signaling.
  • the D2DCommunication resource allocation result carries the D2D communication target identifier information and corresponding resources.
  • the D2D transmitting device determines resources allocated for each D2D communication target according to the received D2D Communication resource allocation indication signaling.
  • the D2D communication target identifier target may be a group ID or a broadcast ID or a target terminal identifier (UE ID) or an RB identifier (the RB identifier may be an RB ID or a group ID/broadcastID+Logical channel ID, etc.) Multiple ways to identify).
  • UE ID target terminal identifier
  • RB identifier may be an RB ID or a group ID/broadcastID+Logical channel ID, etc.
  • the D2D BSR report can be independently reported or jointly reported.
  • the so-called independent reporting means that the device separately reports the D2D BSR information corresponding to the D2D communication target for each D2D communication target; the joint reporting means that the device will D2D BSR of all D2D communication targets.
  • the information is reported to the resource allocation control node at a time.
  • the D2D Communication transmitting device determines which D2D data of the D2D communication target needs to be transmitted and the amount of data to be transmitted for one D2D communication target, and then selects an appropriate amount according to the amount of data to be sent corresponding to the D2D communication target in the resource pool corresponding to each D2D communication target. Resources.
  • the resource corresponding to each D2D communication target may be first determined, and then the corresponding D2D RB (Radio Bearer) of the D2D communication target is organized according to the D2D RB priority.
  • MAC PDU Radio Bearer
  • the terminal when the terminal organizes the MAC PDU, the D2D communication target identification information and the D2D transmission device identification information may be carried in the MAC PDU.
  • Embodiment 1 D2D BSR Process (BSR is based on device triggering, D2D for each D2D communication target) The buffer status is reported independently or jointly.
  • the D2D BSR parameter configuration, the D2D BSR triggering mechanism, the D2D BSR reporting process, and the D2D BSR reporting format are described in the following four D2D BSR processes, as follows:
  • D2D BSR parameter configuration wherein the D2D BSR related parameter may be configured by the resource allocation control node based on the device, including any of the following parameters or combinations, of course, for the network scenario, D2D and D2N may also multiplex a set of D2D BSR parameters.
  • D2D retxBSR-Timer Disables the timer reported by the D2D BSR.
  • D2D periodicBSR-Timer Timer reported by the periodic D2D BSR.
  • D2D BSR trigger mechanism wherein the D2D BSR trigger is based on device triggering, and the trigger condition may be any of the following conditions:
  • D2D regular BSR a.
  • the data in the current D2D buffer arrives at the higher priority data or the D2D buffer in the device is empty.
  • b is triggered when the device D2D retxBSR-Timer times out and there is data in the buffer.
  • Periodic BSR Periodic BSR: The D2D periodicBSR-Timer of the device times out, triggering the Periodic BSR.
  • D2D Banding If the device is organizing a device to the MAC PDU of the resource allocation control node, in addition to the data to be transmitted, there is a resource available (padding), which can trigger the D2D Padding BSR.
  • the D2D BSR reporting format the D2D BSR is reported in the form of a MAC CE (Control Element), and is divided into a MAC subheader and a MAC CE.
  • the D2D BSR MAC CE includes two formats: a long D2D BSR and a short/truncated D2D BSR. The truncated D2D BSR and the short D2D BSR have the same format.
  • the D2D BSR MAC CE sub-header or the MAC CE must contain the identification information of the D2D communication target.
  • the identification information of the D2D communication target may be in various forms, such as a group ID or a broadcast ID or a target terminal identifier (UE ID) or an RB identifier (the RB identifier may be an RB ID or a group ID/broadcast). ID+Logical channel ID and other ways to identify).
  • the D2D BSR report can be independently reported or jointly reported.
  • the so-called independent reporting means that the device reports the D2D BSR information corresponding to the D2D communication target for each D2D communication target respectively;
  • the D2D BSR information of all D2D communication targets is reported to the resource allocation control node at one time.
  • the independent reporting is taken as an example.
  • the communication destination in the D2D BSR is the group ID.
  • the BSR MAC CE subheader and its MAC CE grid can be seen in Figure 5, Figure 6, and Figure 7. Wherein, D/N in the subheader is used to indicate whether the D2D BSR MAC CE is for a D2N link or a D2D link.
  • the "D2D communication target identifier" in the MAC subheader may be used to indicate which group of bitmaps are included in the D2D BSR MAC CE (provided that the resource allocation control node and the terminal agree on the group identifier corresponding to each bit) And then sequentially indicating the D2D buffer status information corresponding to each D2D communication target in the order of the bitmap; or the "D2D communication target identifier" in the MAC subheader in the above figure as a reserved bit, and then each D2D in the D2D BSR MAC CE The D2D communication target identification information is added before the buffer status information.
  • Embodiment 2 D2D BSR process (initiated reporting based on D2D communication target triggering, D2D buffer status for each D2D communication target), similarly, the following processing from D2D BSR parameter configuration, D2D BSR trigger mechanism, D2D BSR reporting
  • D2D BSR reporting format describes the D2D BSR process in four distinct ways, as follows:
  • D2D BSR parameter configuration wherein the D2D BSR related parameters may be configured by the resource allocation control node based on the device or the D2D communication target, including any of the following parameters or combinations, of course, for the network scenario, D2D and D2N may also be reused.
  • D2D retxBSR-Timer Disables the timer reported by the D2DBSR.
  • D2D periodicBSR-Timer Timer reported by the periodic D2DBSR.
  • D2D BSR trigger mechanism D2D BSR trigger mechanism
  • D2D BSR trigger is triggered based on D2D communication target, and the trigger condition can be any of the following conditions:
  • D2D regular BSR a, current data in the D2D buffer for a particular D2D communication target, higher priority data arrival or device triggers when data arrives in the D2D buffer where a particular D2D communication target is originally empty; b The device triggers when the D2D retxBSR-Timer of a specific D2D communication target times out and there is data in the cache.
  • D2D Periodic BSR The device times out the D2D periodicBSR-Timer for a specific D2D communication target, triggering the Periodic BSR.
  • D2D Banding If the device organizes the device to the resource allocation control node's MAC PDU for a specific D2D communication target, in addition to the data to be transmitted, there is a resource available (padding), which can trigger the D2D Padding BSR.
  • the D2D BSR report format the D2DBSR is reported in the form of a MAC CE (Control Element), and is divided into a MAC subheader and a MAC CE.
  • the D2D BSR MAC CE includes two formats: a long D2D BSR and a short/truncated D2D BSR. The truncated D2D BSR and the short D2D BSR have the same format.
  • the D2D BSR MAC CE sub-header or the MAC CE should contain the identification information of the D2D communication target.
  • the identification information of the D2D communication target may be in various forms, such as a group ID or a broadcast ID or a target terminal identifier (UE ID) or an RB identifier (the RB identifier may be an RB ID or a group ID/broadcast). ID+Logical channel ID and other ways to identify).
  • the D2D BSR report uses the independent reporting.
  • the so-called independent reporting means that the device reports the D2D BSR information corresponding to the D2D communication target for each D2D communication target.
  • the group ID of the D2D communication destination is taken as an example.
  • the D2D BSR MAC CE subheader and its MAC CE format can be seen in FIG. 8, FIG. 9, and FIG. Wherein, D/N in the subheader is used to indicate whether the D2D BSR MAC CE is for a D2N link or a D2D link.
  • Embodiment 3 Determining D2D Communication resources for different D2D communication targets (centralized resource allocation)
  • the resource allocation control node respectively allocates D2D Communication resources based on the D2D BSR information reported by the device for each D2D communication target. If the D2D communication resource in the system is limited, the resource allocation control node needs to comprehensively consider resource allocation according to the priority of each device of the D2D communication and the QoS parameter of the D2D communication service requested by each device according to the request of the service.
  • the resource allocation control node may notify the corresponding D2D Communication transmitting device by using the resource allocation indication signaling.
  • the resource allocation indication information needs to carry the identifier information of each D2D communication target of the D2D Communication sending device and the corresponding resource allocation indication information (including time-frequency resources, modulation and coding modes, and the like).
  • the D2D Communication sending device determines a specific resource allocated for each D2D communication target according to the received D2D Communication resource allocation indication signaling.
  • Embodiment 4 Determining the D2D Communication resource for different D2D communication targets (distributed resource allocation)
  • the D2D Communication transmitting device determines which D2D data of the D2D communication target needs to be transmitted and the amount of data to be transmitted for one D2D communication target, and then selects an appropriate amount according to the amount of data to be sent corresponding to the D2D communication target in the resource pool corresponding to each D2D communication target. Resources.
  • the resource pools corresponding to different D2D communication targets may be the same or different, and may be configured by the resource allocation node to be pre-configured to the terminal or the terminal.
  • the D2D Communication sending device may determine which D2D RBs of the D2D communication target are allocated resources according to the QoS parameters of the D2D communication service to be served. The resources allocated by the D2D RBs belonging to the same D2D communication target are then merged, and the merged resources are resources for the D2D communication target.
  • Embodiment 5 Organization mode of D2D Communication sender MAC PDU
  • the D2D Communication transmitting device determines the specific resources allocated for each D2D Communication communication target, the D2D Communication MAC PDUs are respectively organized according to the resources allocated for the respective D2D communication targets, and the organized MAC PDUs are passed through corresponding The resource is sent.
  • the D2D communication resources allocated by the resource allocation control node to the device UE1 are as follows:
  • D2D communication target identifier Resource allocation information Group ID1 D2D resource allocation information 1 (PRB location, MCS level, etc.) Group ID2 D2D resource allocation information 2 (PRB location, MCS level, etc.) Group ID3 Not assigned to resources
  • the UE of the D2D Communication sender needs to organize the data in the cache corresponding to Group ID1 and Group ID2 into a MAC PDU according to the resource allocation indication information.
  • a MAC PDU When configuring a MAC PDU, consider the priority priority of multiple D2D RBs included in a Group ID. If multiple D2D RBs corresponding to a Group ID have priority and PBR (Prioritized Bit Rate) configuration, then first The D2D RB priority queue may be generated according to the priority parameter of the D2D RB corresponding to the Group ID. According to the D2D RB priority queue, two rounds of resource allocation are performed according to the following manner, and the MAC PDU is organized as follows:
  • the first round of resource allocation according to the priority queue composed of D2D RBs included in the Group ID, in turn for each The RB performs the first round of resource allocation according to the PBR.
  • the first round of resource allocation ends, and if there are remaining resources, the second round of resource allocation is continued; otherwise, the resource allocation ends.
  • the second round of resource allocation if there is any remaining resource corresponding to the group ID after the first round of allocation, the second round of resource allocation is performed, and the priority queue consisting of the D2D RBs included in the Group ID is still used, once for each RB. The remaining amount of data is allocated for resources until the resources are exhausted or resource allocation for all RB data has been completed.
  • each D2D RB included in each Group ID is finally allocated to a resource, and organized into a MAC PDU according to the resource allocation result.
  • the MAC PDU is sent by the physical resource allocated to the group ID to which it belongs.
  • Embodiment 6 MAC PDU format
  • the format of the MAC PDU can be as shown in FIG. 11.
  • the MAC PDU in this embodiment includes the D2D communication target identifier (the D2D communication target identifier is carried in the MAC sub-header or the MAC SDU). Specifically, it depends on its length and size, and several MAC subheaders and MAC SDUs for the D2D communication target. In addition, D2D communication source identification information may also be carried.
  • the D2D Communication receiving device can obtain the D2D Communication resource used by the D2D Communication transmission from the resource allocation control node and receive it on the corresponding D2D Communication resource.
  • the D2D transmitting device's MAC PDU may not carry the D2D communication target identifier and the D2D communication source identification information.
  • the foregoing embodiment is described by using a single processing step in the D2D data communication process as an embodiment.
  • the real D2D communication data transmission process may be implemented in combination with some embodiments in the foregoing embodiments.
  • the embodiment may be implemented.
  • a 1/3/5/6 or 2/3/5/6 combination can obtain a D2D Communication data transmission process in a centralized resource allocation mode; a distributed version can be obtained for the embodiment 3/4/5/6 combination.
  • a device-to-device communication data transmission apparatus is also provided.
  • a device-to-device communication data transmission apparatus includes:
  • a determining module 121 configured to determine a device-to-device D2D communication destination corresponding to the user equipment UE at the transmitting end Standard
  • An allocating module 122 configured to allocate a corresponding resource for each D2D communication target
  • the processing module 123 is configured to generate a media access control protocol data unit MAC PDU corresponding to the D2D communication target according to the resource corresponding to each D2D communication target, and send the MAC PDU by using the resource corresponding to the D2D communication target.
  • the device-to-device communication data transmission apparatus further includes: a configuration module (not shown) for configuring a corresponding communication target identifier for the D2D communication target in advance.
  • the processing module 123 is further configured to carry the D2D communication target identifier in a medium access control MAC sub-header in the MAC PDU or a medium access control service data unit MAC SDU in the MAC PDU.
  • the D2D communication target identifier includes at least one of the following: a group identifier, a broadcast identifier, a target terminal identifier, and a radio bearer RB identifier.
  • the distribution module 122 may include: a receiving sub-module (not shown), configured to receive the D2D buffer status report BSR information corresponding to each D2D communication target reported by the UE at the transmitting end; the first determining sub-module (not shown) And determining, according to the D2D BSR information, determining, for each D2D communication target, a corresponding resource; and processing a sub-module (not shown), configured to generate resource allocation information according to the determined resource allocated for each D2D communication target. And transmitting the resource allocation information to the UE at the transmitting end, causing the UE at the transmitting end to determine to allocate resources for each D2D communication target according to the resource allocation information.
  • the resource allocation information may include a D2D communication target identifier corresponding to each D2D communication target, and a resource corresponding to each D2D communication target.
  • the UE at the transmitting end reports the D2D BSR information corresponding to each D2D communication target by means of independent reporting or unified reporting.
  • the triggering condition for the UE of the transmitting end to report the D2D BSR information corresponding to the D2D communication target includes at least one of the following: the D2D buffer of the D2D communication target has a higher priority than the current data; the D2D corresponding to the D2D communication target The buffer is originally empty, but new data arrives; the D2DBSR cycle timer of the D2D communication target times out; when the MAC PDU is generated for the D2D communication target, the resource corresponding to the D2D communication target contains resources required for the D2D data to be transmitted. Available resources other than .
  • the D2D BSR information includes a D2D communication target identifier corresponding to the D2D communication target and a buffer status BS information of the D2D buffer corresponding to the D2D communication target.
  • the allocating module 122 may further include: a second determining submodule (not shown) for determining an amount of data to be sent by each D2D logical channel or logical channel group corresponding to each D2D communication target; the first allocation submodule (not shown) for allocating corresponding resources for each D2D communication target according to the amount of data and the resource pool corresponding to each D2D communication target.
  • the processing module 123 may include: a third determining submodule (not shown), configured to determine a priority of each D2D radio bearer RB corresponding to the D2D communication target, and sorting from high to low according to the D2D RB priority, Generating a D2D RB priority queue corresponding to the D2D communication target; generating a sub-module (not shown) for performing resource allocation on the resource corresponding to the D2D communication target according to the D2D RB priority queue, and according to the allocation result of the resource allocation, A MAC PDU corresponding to the D2D communication target is generated.
  • a third determining submodule (not shown), configured to determine a priority of each D2D radio bearer RB corresponding to the D2D communication target, and sorting from high to low according to the D2D RB priority, Generating a D2D RB priority queue corresponding to the D2D communication target; generating a sub-module (not shown) for performing resource allocation on the resource corresponding to the
  • the generating sub-module may include: a second allocation sub-module (not shown), configured to perform resources according to the prioritized bit rate PBR for each D2D RB corresponding to the D2D communication target according to the D2D RB priority queue.
  • An allocation sub-module (not shown), after performing resource allocation, if there is no remaining resource, determining, according to the resource allocation result, a resource allocated by each D2D RB in the D2D communication target, and according to the resource
  • the D2D communication target organization corresponds to the MAC PDU.
  • the generating submodule may further include: a third allocating submodule (not shown), if there is remaining resources after the resource allocation, according to the remaining resources, according to the D2D RB priority queue, corresponding to the D2D communication target Each D2D RB has not allocated resource data for resource allocation, and determines that the remaining resource allocation is allocated when all data of each D2D RB in the D2D RB priority queue is allocated to the resource or the remaining resources are allocated. End;
  • the organization sub-module is further configured to: after the end of the remaining resource allocation, determine, according to the resource allocation and the allocation result of the remaining resource allocation, the resource allocated by each D2D RB in the D2D communication target, and organize the D2D communication target according to the resource. Corresponding MAC PDU.
  • a MAC PDU is separately generated for each D2D communication target of the UE at the transmitting end, thereby avoiding data multiplexing of one device to different D2D communication target devices in one MAC PDU. Occurs, which reduces the overhead of the MAC PDU, and also ensures that the device at the receiving end does not need to perform unnecessary blind detection, thereby achieving the purpose of power saving.
  • the object of the present invention can run a program or a set of programs on any computing device.
  • the computing device can be a well-known general purpose device.
  • the object of the present invention can also be achieved by merely providing a program product comprising program code for implementing the method or apparatus. That is to say, such a program product also constitutes the present invention, and a storage medium storing such a program product also constitutes the present invention. It will be apparent that the storage medium may be any known storage medium or any storage medium developed in the future.
  • a storage medium (which may be a ROM, a RAM, a hard disk, a detachable memory, or the like) in which a computer for performing a data transmission step of device-to-device communication is embedded a program having a code segment configured to perform the steps of: determining a device-to-device D2D communication target corresponding to the user equipment UE at the transmitting end; assigning a corresponding resource to each D2D communication target; according to each D2D communication target The corresponding resource generates a media access control protocol data unit MAC PDU corresponding to the D2D communication target, and sends a MAC PDU by using a resource corresponding to the D2D communication target.
  • a storage medium which may be a ROM, a RAM, a hard disk, a detachable memory, or the like
  • a computer program having a code segment configured to perform a data transmission step of device-to-device communication: determining a device-to-device D2D corresponding to a user equipment UE at a transmitting end a communication target; assigning a corresponding resource to each D2D communication target; generating a media access control protocol data unit MAC PDU corresponding to the D2D communication target according to the resource corresponding to each D2D communication target, and using the D2D communication target The corresponding resource sends a MAC PDU.
  • a program constituting the software is installed from a storage medium or a network to a computer having a dedicated hardware structure, such as the general-purpose computer 1300 shown in FIG. 13, which is installed When there are various programs, you can perform various functions and so on.
  • a central processing module (CPU) 1301 executes various processes in accordance with a program stored in a read only memory (ROM) 1302 or a program loaded from a storage portion 1308 to a random access memory (RAM) 1303.
  • ROM read only memory
  • RAM random access memory
  • data required when the CPU 1301 executes various processes and the like is also stored as needed.
  • the CPU 1301, the ROM 1302, and the RAM 1303 are connected to each other via a bus 1304.
  • Input/output interface 1305 is also coupled to bus 1304.
  • the following components are connected to the input/output interface 1305: an input portion 1306 including a keyboard, a mouse, etc.; an output portion 1307 including a display such as a cathode ray tube (CRT), a liquid crystal display (LCD), and the like, and a speaker and the like;
  • the storage portion 1308 includes a hard disk or the like; and the communication portion 1309 includes a network interface card such as a LAN card, a modem, and the like.
  • the communication section 1309 performs communication processing via a network such as the Internet.
  • the driver 1310 is also connected to the input/output interface 1305 as needed.
  • a removable medium 1311 such as a magnetic disk, an optical disk, a magneto-optical disk, a semiconductor memory or the like is mounted on the drive 1310 as needed so that it is read out therefrom
  • the computer program is installed into the storage portion 1308 as needed.
  • a program constituting the software is installed from a network such as the Internet or a storage medium such as the removable medium 1311.
  • such a storage medium is not limited to the removable medium 1311 shown in FIG. 13 in which a program is stored and distributed separately from the device to provide a program to the user.
  • the detachable medium 1311 include a magnetic disk (including a floppy disk (registered trademark)), an optical disk (including a compact disk read only memory (CD-ROM) and a digital versatile disk (DVD)), and a magneto-optical disk (including a mini disk (MD) (registered trademark) )) and semiconductor memory.
  • the storage medium may be a ROM 1302, a hard disk included in the storage portion 1308, and the like, in which programs are stored, and distributed to the user together with the device including them.

Abstract

本发明公开了一种设备到设备通信的数据传输方法及装置，该设备到设备通信的数据传输方法包括：确定发送端的用户设备UE所对应的设备到设备D2D通信目标；为每个D2D通信目标分配对应的资源；根据每个D2D通信目标所对应的资源，生成该D2D通信目标所对应的媒体接入控制协议数据单元MAC PDU，并利用该D2D通信目标所对应的资源发送MAC PDU。本发明通过针对发送端的UE的每个D2D通信目标单独生成MAC PDU，从而避免了一个设备到不同D2D通信目标设备的数据复用在一个MAC PDU的情况发生，进而减少了MAC PDU的头开销，并且还保证了接收端的设备不需要进行不必要的盲检，达到了节电的目的。

Description

设备到设备通信的数据传输方法及装置
本申请要求在2014年1月2日提交中国专利局、申请号为201410001603.3、发明名称为“设备到设备通信的数据传输方法及装置”的中国专利申请的优先权，其全部内容通过引用结合在本申请中。
技术领域
本发明涉及移动通信领域，具体来说，涉及一种设备到设备通信的数据传输方法及装置。
背景技术
1、LTE D2N通信系统
在LTE(Long Term Evolution，长期演进)系统中，数据的发送和接收采取的是网络集中控制的方式，即用户设备UE的上下行数据都在网络的控制下进行发送和接收。UE和UE之间的通信，是由网络进行转发和控制的，UE与UE之间不存在直接的通信链路，这种方式下UE和网络的数据传输可以简称为D2N(Device to Network，设备到网络)传输。
LTE D2N通信系统中的BSR(Buffer State Reporting，缓冲区状态上报)机制如下：
BSR的目的：
LTE系统都是基于调度的系统，由基站为终端设备分配数据传输所需的时频资源，终端根据基站的调度命令进行下行数据接收或者上行数据发送。上行数据传输是由基站调度的，基站调度器确定上行资源分配情况之后会通过UL grant(上行调度许可)通知终端。基站调度器进行上行资源分配的依据是终端要发送的上行数据量，即终端的缓存状态。该缓存在终端侧，基站要想获知该信息，就需要终端向基站进行BSR(Buffer state report，缓存状态上报)。LTE Rel-11及之前版本中BSR机制如下：
BSR相关RRC层参数配置：
LTE系统中RRC层针对BSR配置的参数包括如下两个定时器，这两个定时器均是基于UE
配置和维护的：
retxBSR-Timer：禁止BSR上报的定时器；
periodicBSR-Timer：周期性BSR上报的定时器；
BSR分类以及触发机制
常规BSR(Regular BSR)：(1)当有比当前buffer中的数据更高优先级的数据到达或原本为空的buffer中有数据到达时触发；(2)retxBSR-Timer超时且缓存中有数据时触发。
周期性BSR(Periodic BSR)：periodicBSR-Timer超时时触发Periodic BSR。
捎带(Padding BSR)：如果UE在组织MAC PDU的时候，除了需要传输的数据外还有资源可用(padding)，可以触发Padding BSR。
BSR上报原则：
对于Regular BSR和Periodic BSR如果多余一个LCG(logical channel group，逻辑信道组)有数据可用，则上报long BSR，否则上报short BSR；
对于padding BSR，如果padding bit数大于等于(short BSR+MAC subheader)但是小于(long BSR+MAC subheader)，则如果UE有多余一个LCG有数据可用，则上报截短的BSR，否则上报short BSR；如果padding bit大于等于(long BSR+MAC subheader)，则上报long BSR；
触发BSR后，Periodic BSR和Padding BSR都要在有上行资源可用时才能上报，Regular BSR在没有上行资源可用时则会触发SR(Scheduling Request，调度请求)过程，请求基站给UE分配上行资源。
基站给UE分配上行资源后，如果该资源刚够发送所有上行数据，则可以不发BSR，直接发送上行数据；如果该资源不够发送所有上行数据，优先上报Regular BSR或者Periodic BSR，基站再根据BSR上报的UE所需上行数据量进行后续传输调度。
一个MAC PDU最多包含一个BSR。BSR优先级：Regular BSR＝Periodic BSR>padding BSR,如果多个BSR同时触发，只上报优先级最高的，对于Regular BSR和Periodic BSR由于其上报内容相同，都包含UE buffer中全部可用的数据量信息，上报格式完全相同，任选一个上报即可。MAC层在组织MAC PDU的时候优先放置这两类MAC CE，其后才放置MAC SDU。
padding BSR的优先级低于数据。在同一个子帧可以在不同MAC PDU上报padding BSR和regular/periodic BSR。
BSR上报后的处理：
只要BSR被触发且可以上报，则启动或重启periodicBSR-Timer和retxBSR-Timer,但是
需要注意对于截短的BSR，不能启动/重启periodicBSR-Timer，只启动或重启retxBSR-Timer。
BSR上报格式：
BSR以MAC CE(Control Element，控制单元)的形式上报，上报时分为MAC子头和MAC CE两部分，BSR MAC CE包括长BSR和短BSR两种格式，truncated BSR和short BSR格式相同。LTE系统中MAC子头和BSR MAC CE的格式如图1、图2、图3所示。
其中各域的含义如下：
LCID(Logical Channel ID，逻辑信道标识)：用于标识对应负荷部分的逻辑信道号，long BSR、short BSR、truncated BSR各有一个LCID。
E(Extended，扩展的)：扩展比特，用于指示下一个byte是MAC子头还是MAC负荷。
R(Reserved,预留的)：预留比特。
LCG ID：逻辑信道组编号。LTE系统中BSR上报时划分了4个逻辑信道组。
Buffer Size：对应逻辑信道组中的数据缓存量。
对于BSR上报，R10/11版本和R8/9版本的区别在于R10/11版本由于支持载波聚合，峰值速率提升，因此引入了新的BS table。支持R10/11的UE上报BSR时是否使用新的BS table由基站通过RRC信令配置。不管是R8/9的BS table还是R10/11的BS table都是64级量化，即用6bit可以表示对应的量化值，所以上面BSR MAC CE格式中每个LCG的buffer size取值都是6bit。
2、LTE D2D通信系统
相互靠近的设备和设备之间允许直接进行D2D communication(设备到设备通信)。为了便于描述，定义D2D终端之间直接通信的链路称为D2D(Device to Device，设备到设备)link，网络与D2D终端之间的蜂窝通信链路称之为D2N(Device to Network，设备到网络)link。
其中，D2D Communication的设备也可以均是在网的，或者均是脱网的，还可以是部分设备在网，部分设备脱网。所谓在网即参与D2D Communication的设备位于3GPP网络覆盖范围内且使用3GPP网络的频谱资源，所谓脱网即参与D2DCommunication的设备不在3GPP网络覆盖范围内或者虽然在3GPP网络覆盖范围内但其使用的是D2D Communication专用频谱资源。
其中，典型的D2D Communication场景包括如下三种：D2D UE之间一对一通信；一个设备通过单次传输给一个通信群组里的所有设备发送相同数据(组通信)；一个设备通过单次传输给所有附近的设备发送相同数据(广播通信)；
其中、D2D UE之间一对一通信主要用于社交等应用，群组/广播通信的场景主要用于公共安全应用中的消防、救援和反恐等。
目前，对于D2D Communication，主要有两种资源分配方式：集中式和分布式。其中，
分布式资源分配：即由UE自行对资源池内的资源进行侦听，看看是否有空闲资源，如果有，则可以自行选择空闲的资源进行D2D Communication。这种方式下不同UE有可能选择相同的D2D Communication资源，从而存在碰撞的问题。
集中式资源分配，则是引入一个资源分配控制节点，来负责管理特定范围(比如一个组或者一个小区等)的D2D Communication资源分配。对于在网情况，一般选择基站作为资源分配控制节点；对于脱网情况，会选择某个设备作为资源分配集中控制节点，该设备一般称为CH(Cluster Header)。
目前，一般认为D2D设备支持并行D2D Communication，即一个D2D设备可以同时和多个D2D通信目标进行D2D Communication，这种情况下需要考虑MAC层如何组织MAC PDU，以保证MAC PDU开销较小并避免D2D Communication设备不必进行不必要的盲检，因此，有必要提出一种设备到设备通信的数据传输技术，来保证MAC PDU开销较小并避免D2D Communication设备不必进行不必要的盲检。
发明内容
针对相关技术中的上述技术问题，本发明提出一种设备到设备通信的数据传输方法及装置，能够使得一个设备到不同目标设备的数据不会复用在一个MAC PDU，从而可以减少MAC PDU的头开销，保证D2D Communication接收端的设备不需要进行不必要的盲检，实现节电的目的。
本发明的技术方案是这样实现的：
根据本发明的一个方面，提供了一种设备到设备通信的数据传输方法。
该设备到设备通信的数据传输方法包括：
确定发送端的用户设备UE所对应的设备到设备D2D通信目标；
为每个D2D通信目标分配对应的资源；
根据每个D2D通信目标所对应的资源，生成该D2D通信目标所对应的媒体接入控制协议数据单元MAC PDU，并利用该D2D通信目标所对应的资源发送MAC PDU。
此外，该设备到设备通信的数据传输方法还包括：预先为D2D通信目标配置对应的D2D通信目标标识；并且，将D2D通信目标标识携带于MAC PDU中的媒体接入控制MAC子头或者MAC PDU中的媒体接入控制服务数据单元MAC SDU中。
其中，D2D通信目标标识包括以下至少之一：组标识、广播标识、目标终端标识、无线承载RB标识。
其中，在为每个D2D通信目标分配对应的资源时，可接收发送端的UE上报的每个D2D通信目标所对应的D2D缓冲区状态上报BSR信息；并根据D2D BSR信息，确定为每个D2D通信目标分配对应的资源；同时根据确定出的为每个D2D通信目标分配的资源，生成资源分配信息，并将资源分配信息发送至发送端的UE，促使发送端的UE根据资源分配信息，确定为每个D2D通信目标分配资源。
其中，资源分配信息包括每个D2D通信目标对应的D2D通信目标标识、以及每个D2D通信目标对应的资源。
其中，发送端的UE通过独立上报或统一上报的方式上报每个D2D通信目标对应的BSR信息。
其中，发送端的UE上报D2D通信目标所对应的D2D BSR信息的触发条件包括以下至少之一：D2D通信目标的D2D缓冲区中有比当前数据的优先级高的数据到达；D2D通信目标对应的D2D缓冲区原来为空，但是有新数据到达；D2D通信目标的D2DBSR周期定时器超时；在为D2D通信目标生成MAC PDU时，D2D通信目标所对应的资源中包含除需要传输的D2D数据所需资源以外的可用资源。
其中，D2D BSR信息包括D2D通信目标对应的D2D通信目标标识、以及D2D通信目标对应的D2D缓冲区的缓冲区状态BS信息。
此外，在为每个D2D通信目标分配对应的资源时，还可确定每个D2D通信目标对应的每个D2D逻辑信道或逻辑信道组将要发送的数据量；并根据数据量以及每个D2D通信目标对应的资源池，为每个D2D通信目标分配对应的资源。
另外，在根据每个D2D通信目标所对应的资源，生成该D2D通信目标所对应的媒体接入控制协议数据单元MAC PDU时，可确定D2D通信目标所对应的每个D2D无线承载RB的优先级，并根据D2D RB优先级从高到底进行排序，生成D2D通信目标对应的D2D RB优先级队列；并根据D2D RB优先级队列，对D2D通信目标所对应 的资源进行资源分配，并根据资源分配的分配结果，生成与D2D通信目标对应的MACPDU。
其中，在根据D2D RB优先级队列，对D2D通信目标对应的资源进行资源分配，并根据资源分配的分配结果，生成与D2D通信目标对应的MAC PDU时，可根据D2DRB优先级队列，为D2D通信目标所对应的每个D2D RB，按照优先化比特速率PBR，进行资源的分配；并在进行资源分配之后，若无剩余资源，则根据资源分配结果，确定D2D通信目标中每个D2D RB所分配到的资源，并根据该资源为D2D通信目标组织对应的MAC PDU。
另外，在根据D2D RB优先级队列，对D2D通信目标对应的资源进行资源分配，并根据资源分配的分配结果，生成与D2D通信目标对应的MAC PDU时，还可在进行资源分配之后，若有剩余资源，则根据所述剩余资源，按照D2D RB优先级队列，为D2D通信目标所对应的每个D2D RB尚未分配资源的数据进行资源分配，并在所述D2D RB优先级队列中每个D2D RB的所有数据都分配到资源或者所述剩余资源分配完毕时，确定所述剩余资源分配结束；并在剩余资源分配结束之后，根据资源分配以及剩余资源分配的分配结果，确定D2D通信目标中每个D2D RB所分配到的资源，并根据该资源为D2D通信目标组织对应的MAC PDU。
根据本发明的另一方面，提供了一种设备到设备通信的数据传输装置。
该设备到设备通信的数据传输装置包括：
确定模块，用于确定发送端的用户设备UE所对应的设备到设备D2D通信目标；
分配模块，用于为每个D2D通信目标分配对应的资源；
处理模块，用于根据每个D2D通信目标所对应的资源，生成该D2D通信目标所对应的媒体接入控制协议数据单元MAC PDU，并利用该D2D通信目标所对应的资源发送MAC PDU。
此外，该设备到设备通信的数据传输装置还包括：配置模块，用于预先为D2D通信目标配置对应的D2D通信目标标识。
并且，处理模块还用于将D2D通信目标标识携带于MAC PDU中的媒体接入控制MAC子头或者MAC PDU中的媒体接入控制服务数据单元MAC SDU中。
其中，D2D通信目标标识包括以下至少之一：组标识、广播标识、目标终端标识、无线承载RB标识。
其中，分配模块可包括：接收子模块，用于接收发送端的UE上报的每个D2D通 信目标所对应的D2D缓冲区状态上报BSR信息；第一确定子模块，用于根据D2D BSR信息，确定为每个D2D通信目标分配对应的资源；处理子模块，用于根据确定出的为每个D2D通信目标分配的资源，生成资源分配信息，并将资源分配信息发送至发送端的UE，促使发送端的UE根据资源分配信息，确定为每个D2D通信目标分配资源。
其中，资源分配信息可以包括每个D2D通信目标对应的D2D通信目标标识、以及每个D2D通信目标对应的资源。
其中，发送端的UE通过独立上报或统一上报的方式上报每个D2D通信目标对应的BSR信息。
其中，发送端的UE上报D2D通信目标所对应的D2D BSR信息的触发条件包括以下至少之一：D2D通信目标的D2D缓冲区中有比当前数据的优先级高的数据到达；D2D通信目标对应的D2D缓冲区原来为空，但是有新数据到达；D2D通信目标的D2DBSR周期定时器超时；在为D2D通信目标生成MAC PDU时，D2D通信目标所对应的资源中包含除需要传输的D2D数据所需资源以外的可用资源。
其中，D2D BSR信息包括D2D通信目标对应的D2D通信目标标识、以及D2D通信目标对应的D2D缓冲区的缓冲区状态BS信息。
此外，分配模块还可包括：第二确定子模块，用于确定每个D2D通信目标对应的每个D2D逻辑信道或逻辑信道组将要发送的数据量；第一分配子模块，用于根据数据量以及每个D2D通信目标对应的资源池，为每个D2D通信目标分配对应的资源。
其中，处理模块可包括：第三确定子模块，用于确定D2D通信目标所对应的每个D2D无线承载RB的优先级，并根据D2D RB优先级从高到底进行排序，生成D2D通信目标对应的D2D RB优先级队列；生成子模块，用于根据D2D RB优先级队列，对D2D通信目标所对应的资源进行资源分配，并根据资源分配的分配结果，生成与D2D通信目标对应的MAC PDU。
其中，生成子模块可包括：第二分配子模块，用于根据D2D RB优先级队列，为D2D通信目标所对应的每个D2D RB，按照优先化比特速率PBR，进行资源的分配；组织子模块，用于在进行资源分配之后，若无剩余资源，则根据资源分配结果，确定D2D通信目标中每个D2D RB所分配到的资源，并根据该资源为D2D通信目标组织对应的MAC PDU。
另外，生成子模块还可包括：第三分配子模块，用于在进行资源分配之后，若有剩余资源，根据剩余资源，按照D2D RB优先级队列，为D2D通信目标所对应的每个 D2D RB尚未分配资源的数据进行资源分配，并在所述D2D RB优先级队列中每个D2DRB的所有数据都分配到资源或者所述剩余资源分配完毕时，确定所述剩余资源分配结束；
并且，组织子模块还用于在剩余资源分配结束之后，根据资源分配以及剩余资源分配的分配结果，确定D2D通信目标中每个D2D RB所分配到的资源，并根据该资源为D2D通信目标组织对应的MAC PDU。
本发明通过针对发送端的UE的每个D2D通信目标单独生成MAC PDU，从而避免了一个设备到不同D2D通信目标设备的数据复用在一个MAC PDU的情况发生，进而减少了MAC PDU的头开销，并且还保证了接收端的设备不需要进行不必要的盲检，达到了节电的目的。
附图说明
为了更清楚地说明本发明实施例或现有技术中的技术方案，下面将对实施例中所需要使用的附图作简单地介绍，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，对于本领域普通技术人员来讲，在不付出创造性劳动的前提下，还可以根据这些附图获得其他的附图。
图1是现有LTE系统中的MAC子头的格式示意图；
图2是现有LTE系统中的短D2D BSR和截短D2D BSR MAC CE格式的示意图；
图3是现有LTE系统中的长D2D BSR格式的示意图；
图4是根据本发明实施例的设备到设备通信的数据方法的流程示意图；
图5是根据本发明实施例的D2D BSR信息基于设备触发时，独立上报D2D BSR信息时MAC字头的格式示意图；
图6是根据本发明实施例的D2D BSR信息基于设备触发时，独立上报BSR信息时的短D2D BSR MAC CE的格式示意图；
图7是根据本发明实施例的D2D BSR信息基于设备触发时，独立上报D2D BSR信息时的长D2D BSR MAC CE的格式示意图；
图8是根据本发明实施例的D2D BSR信息基于D2D通信目标触发时，独立上报D2D BSR信息时MAC字头的格式示意图；
图9是根据本发明实施例的D2D BSR信息基于D2D通信目标触发时，独立上报D2D BSR信息时的短D2D BSR MAC CE的格式示意图；
图10是根据本发明实施例的D2D BSR信息基于D2D通信目标触发时，独立上报D2D BSR信息时的长D2D BSR MAC CE的格式示意图；
图11是根据本发明实施例的MAC PDU格式的示意图；
图12是根据本发明实施例的设备到设备通信的数据传输装置的结构示意图；
图13是实现本发明技术方案的计算机的示例性结构框图。
具体实施方式
下面将结合本发明实施例中的附图，对本发明实施例中的技术方案进行清楚、完整地描述，显然，所描述的实施例仅仅是本发明一部分实施例，而不是全部的实施例。基于本发明中的实施例，本领域普通技术人员所获得的所有其他实施例，都属于本发明保护的范围。
根据本发明的实施例，提供了一种设备到设备通信的数据传输方法。
如图4所示，根据本发明实施例的设备到设备通信的数据传输方法包括：
步骤S401，确定发送端的用户设备UE所对应的设备到设备D2D通信目标；
步骤S403，为每个D2D通信目标分配对应的资源；
步骤S405，根据每个D2D通信目标所对应的资源，生成该D2D通信目标所对应的媒体接入控制协议数据单元MAC PDU，并利用该D2D通信目标所对应的资源发送MAC PDU。
此外，该设备到设备通信的数据传输方法还包括：预先为D2D通信目标配置对应的D2D通信目标标识；并且，将D2D通信目标标识携带于MAC PDU中的媒体接入控制MAC子头或者MAC PDU中的媒体接入控制服务数据单元MAC SDU中。
其中，D2D通信目标标识包括以下至少之一：组标识、广播标识、目标终端标识、无线承载RB标识。
其中，在为每个D2D通信目标分配对应的资源时，可接收发送端的UE上报的每个D2D通信目标所对应的D2D缓冲区状态上报BSR信息；并根据D2D BSR信息，确定为每个D2D通信目标分配对应的资源；同时根据确定出的为每个D2D通信目标分配的资源，生成资源分配信息，并将资源分配信息发送至发送端的UE，促使发送端的UE根据资源分配信息，确定为每个D2D通信目标分配资源。
其中，资源分配信息包括每个D2D通信目标对应的D2D通信目标标识、以及每个D2D通信目标对应的资源。
其中，发送端的UE通过独立上报或统一上报的方式上报每个D2D通信目标对应的D2D BSR信息。
其中，发送端的UE上报D2D通信目标所对应的D2D BSR信息的触发条件包括以下至少之一：D2D通信目标的D2D缓冲区中有比当前数据的优先级高的数据到达；D2D通信目标对应的D2D缓冲区原来为空，但是有新数据到达；D2D通信目标的D2DBSR周期定时器超时；在为D2D通信目标生成MAC PDU时，D2D通信目标所对应的资源中包含除需要传输的D2D数据所需资源以外的可用资源。
其中，D2D BSR信息包括D2D通信目标对应的D2D通信目标标识、以及D2D通信目标对应的D2D缓冲区的缓冲区状态BS信息。
此外，在为每个D2D通信目标分配对应的资源时，还可确定每个D2D通信目标对应的每个D2D逻辑信道或逻辑信道组将要发送的数据量；并根据数据量以及每个D2D通信目标对应的资源池，为每个D2D通信目标分配对应的资源。
另外，在根据每个D2D通信目标所对应的资源，生成该D2D通信目标所对应的媒体接入控制协议数据单元MAC PDU时，可确定D2D通信目标所对应的每个D2D无线承载RB的优先级，并根据D2D RB优先级从高到底进行排序，生成D2D通信目标对应的D2D RB优先级队列；并根据D2D RB优先级队列，对D2D通信目标所对应的资源进行资源分配，并根据资源分配的分配结果，生成与D2D通信目标对应的MACPDU。
其中，在根据D2D RB优先级队列，对D2D通信目标对应的资源进行资源分配，并根据资源分配的分配结果，生成与D2D通信目标对应的MAC PDU时，可根据D2DRB优先级队列，为D2D通信目标所对应的每个D2D RB，按照优先化比特速率PBR，进行资源的分配；并在进行资源分配之后，若无剩余资源，则根据资源分配结果，确定D2D通信目标中每个D2D RB所分配到的资源，并根据该资源为D2D通信目标组织对应的MAC PDU。
另外，在根据D2D RB优先级队列，对D2D通信目标对应的资源进行资源分配，并根据资源分配的分配结果，生成与D2D通信目标对应的MAC PDU时，还可在进行资源分配之后，若有剩余资源，则根据所述剩余资源，按照D2D RB优先级队列，为D2D通信目标所对应的每个D2D RB尚未分配资源的数据进行资源分配，并在所述D2D RB优先级队列中每个D2D RB的所有数据都分配到资源或者所述剩余资源分配完毕时，确定所述剩余资源分配结束；并在剩余资源分配结束之后，根据资源分配以 及剩余资源分配的分配结果，确定D2D通信目标中每个D2D RB所分配到的资源，并根据该资源为D2D通信目标组织对应的MAC PDU。
在实际应用时，本发明的上述技术方案针对不同的D2D通信目标的D2DCommunication资源的确定方式包括以下两种：
1、集中式资源分配：
D2D Communication发送设备向资源分配控制节点进行D2D Communication BSR(Buffer State Report,缓冲区状态上报)时需要携带BSR针对的D2D通信目标标识信息；资源分配控制节点基于设备上报的针对各个D2D通信目标的D2D BSR信息分别分配D2D Communication资源，然后通过D2D Communication资源分配指示信令将D2D Communication资源分配结果指示给D2D Communication发送设备。其中，D2DCommunication资源分配结果中携带D2D通信目标标识信息及其对应的资源。D2D发送设备根据接收到的D2D Communication资源分配指示信令，确定为各个D2D通信目标分配的资源。
其中，D2D通信目标标识目标可以是组标识(group ID)或广播标识(broadcast ID)或目标终端标识(UE ID)或者RB标识(RB标识可以用RB ID或者group ID/broadcastID+Logical channel ID等多种方式标识)。
而D2D BSR上报则可以采用独立上报或者联合上报，所谓独立上报即设备针对每个D2D通信目标分别上报该与该D2D通信目标对应的D2D BSR信息；联合上报即设备将所有D2D通信目标的D2D BSR信息一次上报给资源分配控制节点。
2、分布式资源分配：
D2D Communication发送设备确定一个调度时刻针对哪些D2D通信目标的D2D数据需要传输以及要传输的数据量，然后在各个D2D通信目标对应的资源池内根据该D2D通信目标对应的要发送的数据量选择合适的资源。
在实际应用时，终端组织MAC PDU时，可首先确定各个D2D通信目标对应的资源，然后在该资源上针对该D2D通信目标的对应的D2D RB(Radio Bearer，无线承载)按照D2D RB优先级组织MAC PDU。
并且，在终端组织MAC PDU时，MAC PDU中可以带入D2D通信目标标识信息、D2D发送设备标识信息。
下面通过具体实例对本发明的上述技术方案进行详细说明。
实施例1：D2D BSR过程(BSR基于设备触发、针对各个D2D通信目标的D2D 缓冲区状态独立上报或者联合上报)，下面分别从D2D BSR参数配置、D2D BSR触发机制、D2D BSR上报后的处理、D2D BSR上报格式四个分明对D2D BSR过程进行说明，具体如下：
1)D2D BSR参数配置；其中，D2D BSR相关参数可以由资源分配控制节点基于设备配置，包含如下任一参数或者组合，当然对于在网场景，D2D和D2N也可以复用一套D2D BSR参数。
D2D retxBSR-Timer：禁止D2D BSR上报的定时器；
D2D periodicBSR-Timer：周期性D2D BSR上报的定时器。
2)D2D BSR触发机制；其中，D2D BSR触发基于设备触发，触发条件可以是如下任一条件：
D2D常规BSR：a、当前D2D buffer中的数据更高优先级的数据到达或设备原本为空的D2D buffer中有数据到达时触发；b、设备D2D retxBSR-Timer超时且缓存中有数据时触发。
D2D周期性BSR(Periodic BSR)：设备的D2D periodicBSR-Timer超时，触发Periodic BSR。
D2D捎带(Padding BSR)：如果设备在组织设备到资源分配控制节点的MAC PDU时，除了需要传输的数据外还有资源可用(padding)，可以触发D2D Padding BSR。
3)D2D BSR上报后的处理；其中，只要D2D BSR被触发且可以上报，则启动或重启对应的D2D periodicBSR-Timer和D2D retxBSR-Timer,但是需要注意对于截短的D2D BSR，不能启动/重启D2D periodicBSR-Timer，只启动或重启D2D retxBSR-Timer。
4)D2D BSR上报格式；其中，D2D BSR以MAC CE(Control Element)的形式上报，上报时分为MAC子头和MAC CE两部分。其中，D2D BSR MAC CE包括长D2D BSR和短/截短D2D BSR两种格式，截短D2D BSR和短小D2D BSR格式相同。而对于D2D BSR，由于要区分通信目标上报D2D BSR，因此D2D BSR MAC CE子头或者MAC CE内要包含D2D通信目标的标识信息。D2D通信目标的标识信息可以有多种形式，比如：组标识(group ID)或广播标识(broadcast ID)或目标终端标识(UE ID)或者RB标识(RB标识可以用RB ID或者group ID/broadcast ID+Logical channel ID等多种方式标识)。
D2D BSR上报可以采用独立上报或者联合上报，所谓独立上报即设备针对每个D2D通信目标分别上报与该D2D通信目标对应的D2D BSR信息；联合上报即设备将 所有D2D通信目标的D2D BSR信息一次上报给资源分配控制节点。
以独立上报为例，D2D BSR中的通信目标为group ID为例，BSR MAC CE子头及其MAC CE格可参见图5、图6、图7所示。其中，子头中D/N用于表示这个D2D BSR MAC CE是针对D2N链路的还是D2D链路的。
而如果采用联合上报，那么可以用MAC子头中“D2D通信目标标识”指示该D2D BSR MAC CE中包含哪些组的bitmap(前提是资源分配控制节点和终端约定好每个bit对应的组标识)，然后在按照bitmap顺序依次指示每个D2D通信目标对应的D2D缓冲区状态信息；或者将上图中MAC子头中“D2D通信目标标识”作为保留比特，然后在D2D BSR MAC CE中每个D2D缓冲区状态信息之前增加D2D通信目标标识信息。
实施例2：D2D BSR过程(基于D2D通信目标触发、针对各个D2D通信目标的D2D缓冲区状态独立上报)，同样的，下面分别从D2D BSR参数配置、D2D BSR触发机制、D2D BSR上报后的处理、D2D BSR上报格式四个分明对D2D BSR过程进行说明，具体如下：
1)D2D BSR参数配置；其中，D2D BSR相关参数可以由资源分配控制节点基于设备或者D2D通信目标配置，包含如下任一参数或者组合，当然对于在网场景，D2D和D2N也可以复用一套BSR上报参数。
D2D retxBSR-Timer：禁止D2DBSR上报的定时器；
D2D periodicBSR-Timer：周期性D2DBSR上报的定时器。
2)D2D BSR触发机制；D2D BSR触发基于D2D通信目标触发，触发条件可以是如下任一条件：
D2D常规BSR：a、当前针对某个特定D2D通信目标的D2D buffer中的数据更高优先级的数据到达或设备针对某个特定D2D通信目标原本为空的D2D buffer中有数据到达时触发；b、设备针对某个特定D2D通信目标的D2D retxBSR-Timer超时且缓存中有数据时触发。
D2D周期性BSR(Periodic BSR)：设备针对某个特定D2D通信目标的D2D periodicBSR-Timer超时，触发Periodic BSR。
D2D捎带(Padding BSR)：如果设备针对某个特定D2D通信目标在组织设备到资源分配控制节点的MAC PDU时，除了需要传输的数据外还有资源可用(padding)，可以触发D2D Padding BSR。
3)D2D BSR上报后的处理；其中，只要D2D BSR被触发且可以上报，则启动或重启D2D通信目标对应的D2D periodicBSR-Timer和D2D retxBSR-Timer,但是需要注意对于截短的BSR，不能启动/重启D2D通信目标对应的D2D periodicBSR-Timer，只启动或重启D2D通信目标对应的D2D retxBSR-Timer。
4)D2D BSR上报格式；其中，D2DBSR以MAC CE(Control Element)的形式上报，上报时分为MAC子头和MAC CE两部分。其中，D2D BSR MAC CE包括长D2D BSR和短/截短D2D BSR两种格式，截短D2D BSR和短小D2D BSR格式相同。而对于D2D BSR，由于要区分D2D通信目标上报D2D BSR，因此D2D BSR MAC CE子头或者MAC CE内要包含D2D通信目标的标识信息。D2D通信目标的标识信息可以有多种形式，比如：组标识(group ID)或广播标识(broadcast ID)或目标终端标识(UE ID)或者RB标识(RB标识可以用RB ID或者group ID/broadcast ID+Logical channel ID等多种方式标识)。
D2D BSR上报采用独立上报，所谓独立上报即设备针对每个D2D通信目标分别上报与该D2D通信目标对应的D2D BSR信息。
举例说明：以D2D通信目标为group ID为例，D2D BSR MAC CE子头及其MAC CE格式可参见图8、图9、图10。其中，子头中D/N用于表示这个D2D BSR MAC CE是针对D2N链路的还是D2D链路的。
实施例3：针对不同D2D通信目标的D2D Communication资源确定方式(集中式资源分配)
资源分配控制节点基于设备上报的针对各个D2D通信目标的D2D BSR信息分别分配D2D Communication资源。如果系统中D2D Communication资源受限，那么资源分配控制节点需要根据其服务的请求进行D2D Communication的各个设备的优先级、各个设备请求的D2D Communication业务的QoS参数等信息综合考虑进行资源分配。
而一旦资源分配控制节点确定针对其服务的各个D2D Communication发送设备的资源分配信息，那么可以通过资源分配指示信令通知给相应D2D Communication发送设备。其中，资源分配指示信息中需要携带该D2D Communication发送设备的各个D2D通信目标的标识信息及其对应的资源分配指示信息(包括时频资源、调制编码方式等等)。
D2D Communication发送设备根据接收到的D2D Communication资源分配指示信令，确定为各个D2D通信目标分配的具体资源。
实施例4：针对不同D2D通信目标的D2D Communication资源确定方式(分布式资源分配)
D2D Communication发送设备确定一个调度时刻针对哪些D2D通信目标的D2D数据需要传输以及要传输的数据量，然后在各个D2D通信目标对应的资源池内根据该D2D通信目标对应的要发送的数据量选择合适的资源。
具体地，不同D2D通信目标对应的资源池可以相同，也可以不同，可以是资源分配节点配置给终端或者终端内部预配置的。
而当D2D Communication可用资源受限时，D2D Communication发送设备可以根据其服务的要进行D2D Communication业务的QoS参数确定具体为哪些D2D通信目标的哪些D2D RB分配资源。然后将归属于同一个D2D通信目标的D2D RB分配的资源进行合并，合并后的资源即为针对该D2D通信目标的资源。
实施例5：D2D Communication发送端MAC PDU组织方式
在实际应用时，一旦D2D Communication发送设备确定为各个D2D Communication通信目标分配的具体资源，则根据针对各个D2D通信目标分配的资源分别组织D2D Communication的MAC PDU，并将组织好的MAC PDU通过对应的资源进行发送。
举例说明：以组通信为例，资源分配控制节点为设备UE1分配的D2D Communication资源如下：
D2D通信目标标识 资源分配信息
Group ID1 D2D资源分配信息1(PRB位置、MCS等级等)
Group ID2 D2D资源分配信息2(PRB位置、MCS等级等)
Group ID3 未分配到资源
具体的：D2D Communication发送端的UE需要根据上述资源分配指示信息将Group ID1、和Group ID2对应的缓存中数据组织成MAC PDU。组织MAC PDU时需要考虑一个Group ID包含的多个D2D RB的优先级priority，即如果一个Group ID对应的多个D2D RB有优先级和PBR(Prioritized Bit Rate，优先化比特速率)配置，那么首先可以按照该Group ID对应的D2D RB的priority参数从高到低生成D2D RB优先级队列，按照对该D2D RB优先级队列按照如下方式进行两轮资源分配，并组织MAC PDU，具体如下：
第一轮资源分配：按照Group ID包含的D2D RB组成的优先级队列，依次对每个 RB按照PBR进行第一轮资源分配。第一轮资源分配结束，如果还有剩余资源，则继续进行第二轮资源分配；否则，资源分配结束。
第二轮资源分配：如果第一轮分配后该group ID对应的资源还有剩余，那么进行第二轮资源分配，仍然按照该Group ID包含的D2D RB组成的优先级队列，一次对每个RB的剩余数据量进行资源分配，直到资源耗尽或者已经完成对所有RB数据的资源分配。
综合上述两轮资源分配情况，得到每个Group ID包含的各个D2D RB最终分配到资源，按照资源分配结果，组织成MAC PDU。将MAC PDU通过为其归属的Group ID分配的物理资源进行数据发送。
实施例6:MAC PDU格式
本实施例中，MAC PDU的格式可以如图11所示，从图11中可以看出，本实施例的MAC PDU中包含D2D通信目标标识(D2D通信目标标识携带在MAC子头或者MAC SDU中，具体携带在哪取决于其长度大小)和针对该D2D通信目标的若干个MAC子头以及MAC SDU，此外，还可以携带D2D通信源标识信息。
在实际应用时，D2D Communication接收端的设备可以从资源分配控制节点获取其感兴趣的D2D Communication传输使用的D2D Communication资源，并在对应的D2D Communication资源上进行接收即可。当然，如果D2D Communication接收端的设备可以准确获知其感兴趣的D2D Communication使用的资源位置，那么D2D发送设备的MAC PDU中也可以不携带D2D通信目标标识和D2D通信源标识信息。
上述实施例是以D2D数据通信过程中的单个处理步骤分别作为一个实施例进行说明的，真正D2D Communication数据传输过程是可以是对上述实施例中部分实施例进行组合实现的，比如可以将实施例1/3/5/6或者2/3/5/6组合就可以获得一个集中式资源分配方式下的D2D Communication数据传输流程；对实施例3/4/5/6组合就可以得到一个分布式资源分配下的D2D Communication数据传输流程。
由此可见，通过本发明的上述方案，可以使得一个设备到不同D2D通信目标设备的数据不会复用在一个MAC PDU中。从而可以减少MAC PDU头开销，并且保证D2D Communication接收端的设备不需要进行不必要的盲检，达到节电的目的。
此外，根据本发明的实施例，还提供了一种设备到设备通信的数据传输装置。
如图12所示，根据本发明实施例的设备到设备通信的数据传输装置包括：
确定模块121，用于确定发送端的用户设备UE所对应的设备到设备D2D通信目 标；
分配模块122，用于为每个D2D通信目标分配对应的资源；
处理模块123，用于根据每个D2D通信目标所对应的资源，生成该D2D通信目标所对应的媒体接入控制协议数据单元MAC PDU，并利用该D2D通信目标所对应的资源发送MAC PDU。
此外，该设备到设备通信的数据传输装置还包括：配置模块(未示出)，用于预先为D2D通信目标配置对应的通信目标标识。
并且，处理模块123还用于将D2D通信目标标识携带于MAC PDU中的媒体接入控制MAC子头或者MAC PDU中的媒体接入控制服务数据单元MAC SDU中。
其中，D2D通信目标标识包括以下至少之一：组标识、广播标识、目标终端标识、无线承载RB标识。
其中，分配模块122可包括：接收子模块(未示出)，用于接收发送端的UE上报的每个D2D通信目标所对应的D2D缓冲区状态上报BSR信息；第一确定子模块(未示出)，用于根据D2D BSR信息，确定为每个D2D通信目标分配对应的资源；处理子模块(未示出)，用于根据确定出的为每个D2D通信目标分配的资源，生成资源分配信息，并将资源分配信息发送至发送端的UE，促使发送端的UE根据资源分配信息，确定为每个D2D通信目标分配资源。
其中，资源分配信息可以包括每个D2D通信目标对应的D2D通信目标标识、以及每个D2D通信目标对应的资源。
其中，发送端的UE通过独立上报或统一上报的方式上报每个D2D通信目标对应的D2D BSR信息。
其中，发送端的UE上报D2D通信目标所对应的D2D BSR信息的触发条件包括以下至少之一：D2D通信目标的D2D缓冲区中有比当前数据的优先级高的数据到达；D2D通信目标对应的D2D缓冲区原来为空，但是有新数据到达；D2D通信目标的D2DBSR周期定时器超时；在为D2D通信目标生成MAC PDU时，D2D通信目标所对应的资源中包含除需要传输的D2D数据所需资源以外的可用资源。
其中，D2D BSR信息包括D2D通信目标对应的D2D通信目标标识、以及D2D通信目标对应的D2D缓冲区的缓冲区状态BS信息。
此外，分配模块122还可包括：第二确定子模块(未示出)，用于确定每个D2D通信目标对应的每个D2D逻辑信道或逻辑信道组将要发送的数据量；第一分配子模块 (未示出)，用于根据数据量以及每个D2D通信目标对应的资源池，为每个D2D通信目标分配对应的资源。
其中，处理模块123可包括：第三确定子模块(未示出)，用于确定D2D通信目标所对应的每个D2D无线承载RB的优先级，并根据D2D RB优先级从高到底进行排序，生成D2D通信目标对应的D2D RB优先级队列；生成子模块(未示出)，用于根据D2D RB优先级队列，对D2D通信目标所对应的资源进行资源分配，并根据资源分配的分配结果，生成与D2D通信目标对应的MAC PDU。
其中，生成子模块可包括：第二分配子模块(未示出)，用于根据D2D RB优先级队列，为D2D通信目标所对应的每个D2D RB，按照优先化比特速率PBR，进行资源的分配；组织子模块(未示出)，用于在进行资源分配之后，若无剩余资源，则根据资源分配结果，确定D2D通信目标中每个D2D RB所分配到的资源，并根据该资源为D2D通信目标组织对应的MAC PDU。
另外，生成子模块还可包括：第三分配子模块(未示出)，用于在进行资源分配之后，若有剩余资源，根据剩余资源，按照D2D RB优先级队列，为D2D通信目标所对应的每个D2D RB尚未分配资源的数据进行资源分配，并在所述D2D RB优先级队列中每个D2D RB的所有数据都分配到资源或者所述剩余资源分配完毕时，确定所述剩余资源分配结束；
并且，组织子模块还用于在剩余资源分配结束之后，根据资源分配以及剩余资源分配的分配结果，确定D2D通信目标中每个D2D RB所分配到的资源，并根据该资源为D2D通信目标组织对应的MAC PDU。
综上所述，借助于本发明的上述技术方案，针对发送端的UE的每个D2D通信目标单独生成MAC PDU，从而避免了一个设备到不同D2D通信目标设备的数据复用在一个MAC PDU的情况发生，进而减少了MAC PDU的头开销，并且还保证了接收端的设备不需要进行不必要的盲检，达到了节电的目的。
以上结合具体实施例描述了本发明的基本原理，但是，需要指出的是，对本领域的普通技术人员而言，能够理解本发明的方法和装置的全部或者任何步骤或者部件，可以在任何计算装置(包括处理器、存储介质等)或者计算装置的网络中，以硬件、固件、软件或者它们的组合加以实现，这是本领域普通技术人员在阅读了本发明的说明的情况下运用它们的基本编程技能就能实现的。
因此，本发明的目的还可以通过在任何计算装置上运行一个程序或者一组程序来 实现。所述计算装置可以是公知的通用装置。因此，本发明的目的也可以仅仅通过提供包含实现所述方法或者装置的程序代码的程序产品来实现。也就是说，这样的程序产品也构成本发明，并且存储有这样的程序产品的存储介质也构成本发明。显然，所述存储介质可以是任何公知的存储介质或者将来所开发出来的任何存储介质。
根据本发明的实施例，还提供了一种存储介质(该存储介质可以是ROM、RAM、硬盘、可拆卸存储器等)，该存储介质中嵌入有用于进行设备到设备通信的数据传输步骤的计算机程序，该计算机程序具有被配置用于执行以下步骤的代码段：确定发送端的用户设备UE所对应的设备到设备D2D通信目标；为每个D2D通信目标分配对应的资源；根据每个D2D通信目标所对应的资源，生成该D2D通信目标所对应的媒体接入控制协议数据单元MAC PDU，并利用该D2D通信目标所对应的资源发送MACPDU。
根据本发明的实施例，还提供了一种计算机程序，该计算机程序具有被配置用于执行以下设备到设备通信的数据传输步骤的代码段：确定发送端的用户设备UE所对应的设备到设备D2D通信目标；为每个D2D通信目标分配对应的资源；根据每个D2D通信目标所对应的资源，生成该D2D通信目标所对应的媒体接入控制协议数据单元MAC PDU，并利用该D2D通信目标所对应的资源发送MAC PDU。
在通过软件和/或固件实现本发明的实施例的情况下，从存储介质或网络向具有专用硬件结构的计算机，例如图13所示的通用计算机1300安装构成该软件的程序，该计算机在安装有各种程序时，能够执行各种功能等等。
在图13中，中央处理模块(CPU)1301根据只读存储器(ROM)1302中存储的程序或从存储部分1308加载到随机存取存储器(RAM)1303的程序执行各种处理。在RAM 1303中，也根据需要存储当CPU 1301执行各种处理等等时所需的数据。CPU1301、ROM 1302和RAM 1303经由总线1304彼此连接。输入/输出接口1305也连接到总线1304。
下述部件连接到输入/输出接口1305：输入部分1306，包括键盘、鼠标等等；输出部分1307，包括显示器，比如阴极射线管(CRT)、液晶显示器(LCD)等等，和扬声器等等；存储部分1308，包括硬盘等等；和通信部分1309，包括网络接口卡比如LAN卡、调制解调器等等。通信部分1309经由网络比如因特网执行通信处理。
根据需要，驱动器1310也连接到输入/输出接口1305。可拆卸介质1311比如磁盘、光盘、磁光盘、半导体存储器等等根据需要被安装在驱动器1310上，使得从中读出的 计算机程序根据需要被安装到存储部分1308中。
在通过软件实现上述系列处理的情况下，从网络比如因特网或存储介质比如可拆卸介质1311安装构成软件的程序。
本领域的技术人员应当理解，这种存储介质不局限于图13所示的其中存储有程序、与装置相分离地分发以向用户提供程序的可拆卸介质1311。可拆卸介质1311的例子包含磁盘(包含软盘(注册商标))、光盘(包含光盘只读存储器(CD-ROM)和数字通用盘(DVD))、磁光盘(包含迷你盘(MD)(注册商标))和半导体存储器。或者，存储介质可以是ROM 1302、存储部分1308中包含的硬盘等等，其中存有程序，并且与包含它们的装置一起被分发给用户。
还需要指出的是，在本发明的装置和方法中，显然，各部件或各步骤是可以分解和/或重新组合的。这些分解和/或重新组合应视为本发明的等效方案。并且，执行上述系列处理的步骤可以自然地按照说明的顺序按时间顺序执行，但是并不需要一定按照时间顺序执行。某些步骤可以并行或彼此独立地执行。
虽然已经详细说明了本发明及其优点，但是应当理解在不脱离由所附的权利要求所限定的本发明的精神和范围的情况下可以进行各种改变、替代和变换。而且，本申请的术语“包括”、“包含”或者其任何其他变体意在涵盖非排他性的包含，从而使得包括一系列要素的过程、方法、物品或者装置不仅包括那些要素，而且还包括没有明确列出的其他要素，或者是还包括为这种过程、方法、物品或者装置所固有的要素。在没有更多限制的情况下，由语句“包括一个……”限定的要素，并不排除在包括所述要素的过程、方法、物品或者装置中还存在另外的相同要素。

Claims (24)

  1. 一种设备到设备通信的数据传输方法，其特征在于，包括：
    确定发送端的用户设备UE所对应的设备到设备D2D通信目标；
    为每个D2D通信目标分配对应的资源；
    根据每个D2D通信目标所对应的资源，生成该D2D通信目标所对应的媒体接入控制协议数据单元MAC PDU，并利用该D2D通信目标所对应的资源发送所述MAC PDU。
  2. 根据权利要求1所述的数据传输方法，其特征在于，进一步包括：
    预先为所述D2D通信目标配置对应的D2D通信目标标识；
    并且，将所述D2D通信目标标识携带于所述MAC PDU中的媒体接入控制MAC子头或者所述MAC PDU中的媒体接入控制服务数据单元MAC SDU中。
  3. 根据权利要求2所述的数据传输方法，其特征在于，所述D2D通信目标标识包括以下至少之一：
    组标识、广播标识、目标终端标识、无线承载RB标识。
  4. 根据权利要求1所述的数据传输方法，其特征在于，为每个D2D通信目标分配对应的资源包括：
    接收所述发送端的UE上报的每个D2D通信目标所对应的D2D缓冲区状态上报BSR信息；
    根据所述D2D BSR信息，确定为每个D2D通信目标分配对应的资源；
    根据确定出的为所述每个D2D通信目标分配的资源，生成资源分配信息，并将所述资源分配信息发送至所述发送端的UE，促使所述发送端的UE根据所述资源分配信息，确定为所述每个D2D通信目标分配资源。
  5. 根据权利要求4所述的数据传输方法，其特征在于，所述资源分配信息包括每个D2D通信目标对应的D2D通信目标标识、以及每个D2D通信目标对应的所述资源。
  6. 根据权利要求4所述的数据传输方法，其特征在于，所述发送端的UE通过独立上报或统一上报的方式上报所述每个D2D通信目标对应的BSR信息。
  7. 根据权利要求4所述的数据传输方法，其特征在于，所述发送端的UE上报D2D通信目标所对应的D2D BSR信息的触发条件包括以下至少之一：
    所述D2D通信目标的D2D缓冲区中有比当前数据的优先级高的数据到达；
    所述D2D通信目标对应的D2D缓冲区原来为空，但是有新数据到达；
    所述D2D通信目标的D2D BSR周期定时器超时；
    在为所述D2D通信目标生成MAC PDU时，所述D2D通信目标所对应的资源中包含除需要传输的D2D数据所需资源以外的可用资源。
  8. 根据权利要求4所述的数据传输方法，其特征在于，所述D2D BSR信息包括所述D2D通信目标对应的D2D通信目标标识、以及所述D2D通信目标对应的D2D缓冲区的缓冲区状态BS信息。
  9. 根据权利要求1或4所述的数据传输方法，其特征在于，为每个D2D通信目标分配对应的资源包括：
    确定所述每个D2D通信目标对应的每个D2D逻辑信道或逻辑信道组将要发送的数据量；
    根据所述数据量以及所述每个D2D通信目标对应的资源池，为所述每个D2D通信目标分配对应的资源。
  10. 根据权利要求1所述的数据传输方法，其特征在于，根据每个D2D通信目标所对应的资源，生成该D2D通信目标所对应的媒体接入控制协议数据单元MAC PDU包括：
    确定所述D2D通信目标所对应的每个D2D无线承载RB的优先级，并根据所述D2D RB优先级从高到底进行排序，生成所述D2D通信目标对应的D2D RB优先级队列；
    根据所述D2D RB优先级队列，对所述D2D通信目标所对应的资源进行资源分配，并根据所述资源分配的分配结果，生成与所述D2D通信目标对应的MAC PDU。
  11. 根据权利要求10所述的数据传输方法，其特征在于，根据所述D2D RB优先级队列，对所述D2D通信目标对应的资源进行资源分配，并根据所述资源分配的分配结果，生成与所述D2D通信目标对应的MAC PDU包括：
    根据所述D2D RB优先级队列，为所述D2D通信目标所对应的每个D2D RB，按照优先化比特速率PBR，进行所述资源的分配；
    在进行所述资源分配之后，若无剩余资源，则根据所述资源分配结果，确定所述D2D通信目标中每个D2D RB所分配到的资源，并根据该资源为所述D2D通信目标组织对应的MAC PDU。
  12. 根据权利要求11所述的数据传输方法，其特征在于，根据所述D2D RB优先级队列，对所述D2D通信目标对应的资源进行资源分配，并根据所述资源分配的分配 结果，生成与所述D2D通信目标对应的MAC PDU进一步包括：
    在进行所述资源分配之后，若有剩余资源，则根据所述剩余资源，按照所述D2D RB优先级队列，为所述D2D通信目标所对应的每个D2D RB尚未分配资源的数据进行资源分配，并在所述D2D RB优先级队列中每个D2D RB的所有数据都分配到资源或者所述剩余资源分配完毕时，确定所述剩余资源分配结束；
    在所述剩余资源分配结束之后，根据所述资源分配以及所述剩余资源分配的分配结果，确定所述D2D通信目标中每个D2D RB所分配到的资源，并根据该资源为所述D2D通信目标组织对应的MAC PDU。
  13. 一种设备到设备通信的数据传输装置，其特征在于，包括：
    确定模块，用于确定发送端的用户设备UE所对应的设备到设备D2D通信目标；
    分配模块，用于为每个D2D通信目标分配对应的资源；
    处理模块，用于根据每个D2D通信目标所对应的资源，生成该D2D通信目标所对应的媒体接入控制协议数据单元MAC PDU，并利用该D2D通信目标所对应的资源发送所述MAC PDU。
  14. 根据权利要求13所述的数据传输装置，其特征在于，进一步包括：
    配置模块，用于预先为所述D2D通信目标配置对应的D2D通信目标标识；
    并且，所述处理模块还用于将所述D2D通信目标标识携带于所述MAC PDU中的媒体接入控制MAC子头或者所述MAC PDU中的媒体接入控制服务数据单元MAC SDU中。
  15. 根据权利要求14所述的数据传输装置，其特征在于，所述D2D通信目标标识包括以下至少之一：
    组标识、广播标识、目标终端标识、无线承载RB标识。
  16. 根据权利要求13所述的数据传输装置，其特征在于，所述分配模块进一步包括：
    接收子模块，用于接收所述发送端的UE上报的每D2D个通信目标所对应的D2D缓冲区状态上报BSR信息；
    第一确定子模块，用于根据所述D2D BSR信息，确定为每个D2D通信目标分配对应的资源；
    处理子模块，用于根据确定出的为所述每个D2D通信目标分配的资源，生成资源分配信息，并将所述资源分配信息发送至所述发送端的UE，促使所述发送端的UE根 据所述资源分配信息，确定为所述每个D2D通信目标分配资源。
  17. 根据权利要求16所述的数据传输装置，其特征在于，所述资源分配信息包括每个D2D通信目标对应的D2D通信目标标识、以及每个D2D通信目标对应的所述资源。
  18. 根据权利要求16所述的数据传输装置，其特征在于，所述发送端的UE通过独立上报或统一上报的方式上报所述每个D2D通信目标对应的BSR信息。
  19. 根据权利要求16所述的数据传输装置，其特征在于，所述发送端的UE上报D2D通信目标所对应的D2D BSR信息的触发条件包括以下至少之一：
    所述D2D通信目标的D2D缓冲区中有比当前数据的优先级高的数据到达；
    所述D2D通信目标对应的D2D缓冲区原来为空，但是有新数据到达；
    所述D2D通信目标的D2D BSR周期定时器超时；
    在为所述D2D通信目标生成MAC PDU时，所述D2D通信目标所对应的资源中包含除需要传输的D2D数据所需资源以外的可用资源。
  20. 根据权利要求16所述的数据传输装置，其特征在于，所述D2D BSR信息包括所述D2D通信目标对应的D2D通信目标标识、以及所述D2D通信目标对应的D2D缓冲区的缓冲区状态BS信息。
  21. 根据权利要求13或16所述的数据传输装置，其特征在于，所述分配模块包括：
    第二确定子模块，用于确定所述每个D2D通信目标对应的每个D2D逻辑信道或逻辑信道组将要发送的数据量；
    第一分配子模块，用于根据所述数据量以及所述每个D2D通信目标对应的资源池，为所述每个D2D通信目标分配对应的资源。
  22. 根据权利要求13所述的数据传输装置，其特征在于，所述处理模块进一步包括：
    第三确定子模块，用于确定所述D2D通信目标所对应的每个D2D无线承载RB的优先级，并根据所述D2D RB优先级从高到底进行排序，生成所述D2D通信目标对应的D2D RB优先级队列；
    生成子模块，用于根据所述D2D RB优先级队列，对所述D2D通信目标所对应的资源进行资源分配，并根据所述资源分配的分配结果，生成与所述D2D通信目标对应的MAC PDU。
  23. 根据权利要求22所述的数据传输装置，其特征在于，所述生成子模块进一步包括：
    第二分配子模块，用于根据所述D2D RB优先级队列，为所述D2D通信目标所对应的每个D2D RB，按照优先化比特速率PBR，进行所述资源的分配；
    组织子模块，用于在进行所述资源分配之后，若无剩余资源，则根据所述资源分配结果，确定所述D2D通信目标中每个D2D RB所分配到的资源，并根据该资源为所述D2D通信目标组织对应的MAC PDU。
  24. 根据权利要求23所述的数据传输装置，其特征在于，所述生成子模块还包括：
    第三分配子模块，用于在进行所述资源分配之后，若有剩余资源，根据所述剩余资源，按照所述D2D RB优先级队列，为所述D2D通信目标所对应的每个D2D RB尚未分配资源的数据进行资源分配，并在所述D2D RB优先级队列中每个D2D RB的所有数据都分配到资源或者所述剩余资源分配完毕时，确定所述剩余资源分配结束；
    并且，所述组织子模块还用于在所述剩余资源分配结束之后，根据所述资源分配以及所述剩余资源分配的分配结果，确定所述D2D通信目标中每个D2D RB所分配到的资源，并根据该资源为所述D2D通信目标组织对应的MAC PDU。
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