CN105704641A

CN105704641A - Device-to-device D2D data transmission method, D2D data transmission apparatus and D2D UE

Info

Publication number: CN105704641A
Application number: CN201410693713.0A
Authority: CN
Inventors: 黄莹; 陈琳; 塞尔吉奥·帕洛拉里
Original assignee: ZTE Corp
Current assignee: ZTE Corp
Priority date: 2014-11-06
Filing date: 2014-11-26
Publication date: 2016-06-22
Anticipated expiration: 2034-11-26
Also published as: WO2016070601A1; CN105704641B

Abstract

The invention provides a device-to-device D2D data transmission method, a D2D data transmission apparatus and D2D UE. The method comprises the following steps: determining PDCP header compression instruction information used for indicating whether D2D communication sender user equipment UE compresses the PDCP header of a protocol data unit PDU of a packet data convergence protocol PDCP, and/or PDCP encryption instruction information used for indicating whether the D2D communication sender user equipment UE carries out PDCP encryption on the protocol data unit PDU of the packet data convergence protocol PDCP; and sending the PDCP header compression instruction information and/or the PDCP encryption instruction information to D2D communication receiver UE. The problem that the receiver D2D UE cannot correctly parse D2D communication data in the related technology is solved. Therefore, the D2D communication receiver UE can acquire the PDCP header compression instruction information and/or the PDCP encryption instruction information and correctly parse D2D communication data.

Description

Device-to-device D2D data transmission method, device and D2D UE

Technical field

The present invention relates to the communications field, in particular to a kind of standby to equipment D2D data transmission method, device and D2DUE。

Background technology

Along with the development of wireless multimedia service, people are growing to the demand of high data rate and Consumer's Experience, thus power system capacity and covering to conventional cellular network propose high requirement。On the other hand persons or things interested communicating near the right solution of the popular people of making of social networks, the closely application such as data sharing, local advertising, such as, the demand of adjacent service (ProximityServices, referred to as PS) is gradually increased。Obvious limitation is there is in traditional cellular network based on community in the support of high data rate and adjacent service, under this requirement background, device-to-device (Device-to-Device, referred to as the D2D) technology representing future communication technologies development new direction is arisen at the historic moment。The application of D2D technology, it is possible to the burden alleviating cellular network, the battery power consumption reducing subscriber equipment, raising data rate, and improve the robustness of network infrastructure, meet the requirement of above-mentioned high data rate traffic and adjacent service well。

D2D technology can be operated in mandate frequency range or unauthorized frequency range, allow multiple subscriber equipment (i.e. D2D subscriber equipment supporting D2D function, D2DUserEquipment, D2DUE) carry out when having network infrastructure or without network infrastructure directly find/directly communicating。Fig. 1 is the application model schematic diagram of D2D technology in correlation technique, as it is shown in figure 1, the application scenarios of D2D mainly has three kinds:

1) UE1 and UE2 carries out data interaction under the covering of cellular network, and user face data is without network infrastructure, such as the pattern 1 of Fig. 1；

2) weak/without the UE relay transmission of overlay area, the pattern 2 in Fig. 1, it is allowed to the poor UE4 of signal quality pass through near have the UE3 of the network coverage and network to communicate, operator can be helped to spread over, improve capacity；

3) there is earthquake or emergency, pattern 3 when cellular network cisco unity malfunction, it is allowed to equipment room directly communicates, in Fig. 1, between UE5, UE6 and UE7, chain of command and user face all carry out the data communication of a jumping or multi-hop without network infrastructure。

D2D technology generally includes D2D discovery technique and D2D communication technology:

1) D2D discovery technique refers to for judging/determine technology that is mutually adjacent (such as can carry out within D2D direct communications range) between two or more D2D subscriber equipment or that be used for judging/determining first user proximity of devices the second subscriber equipment。

2) D2D communication technology refers to that between D2D subscriber equipment, part or all of communication data can not be made directly the technology of communication by network infrastructure。

D2DUE is before carrying out D2D discovery or D2D communication, it is required for first obtaining corresponding Radio Resource, no matter it is that D2D finds or the D2D communication resource, all there is the two spike-type cultivars method of salary distribution, namely it is UE proprietary resource (the first resource method of salary distribution of distribution by base station, it is also called mode1), or carry out D2D discovery/communication based on the resource acquisition (the Secondary resource method of salary distribution, be also called mode2) competed。The first resource method of salary distribution is the D2DUE suitable D2D resource of distribution by base station according to the request of D2DUE, and this mode is only used for being positioned at the D2DUE that cellular network covers。And the Secondary resource method of salary distribution is generally by base station or one D2D resource pool of system predistribution, participate in the D2D D2DUE finding/communicating and monitor this resource pool, or obtain D2D transmission resource by the mode competed, this mode is mainly used in the D2DUE outside cellular network covers, it is also possible to the D2DUE in cellular network covers。D2DUE in covering for cellular network, it can use the D2D competitive resource pond of institute's Serving cell configuration。D2DUE outside covering for cellular network, then can use pre-configured D2D competitive resource pond。

In the related, the UE carrying out D2D communication moves to the scene of cellular network coverage area from cellular network covering, UE is once detect that it is in certain MPS process of cellular network, and this community support D2D communication, then stop using the pre-configured D2D resource under frequency identical with this community。UE is only from the system information broadcast (SystemInformationBroadcast of this community, referred to as SIB) middle acquisition mode2 resource (if present), or set up after obtaining mode1/mode2D2D resource by proprietary signaling after RRC connects, just can restart D2D communication data and send。Therefore, the UE under above-mentioned scene will experience a period of time D2D communication disruption, this will affect D2D business continuance, especially for some delay sensitive business, such as VOIP business。

It addition, in LTE system, base station need to be carried as sender and recipient UE configuration PDCP layer parameter by RRC signaling for each, for instance, PDCP head compression relevant parameter。And D2D communication in, the communication between UE need not by base station, and particular for broadcast communication scene, base station may not even be aware which UE be recipient UE, it is impossible to by RRC signaling be D2DUE configuration corresponding radio bearer parameter。In this case, recipient D2DUE can not obtain these D2D radio bearer PDCP layer parameters, it is impossible to correct parsing D2D communication data。

Therefore, there is D2D service disconnection and the problem that recipient D2DUE cannot correctly resolve D2D communication data in the related。

Summary of the invention

The invention provides a kind of device-to-device D2D data transmission method, device and D2DUE, so that in few correlation technique, solving that correlation technique exists D2D service disconnection and the problem that recipient D2DUE cannot correctly resolve D2D communication data。

According to an aspect of the present invention, provide a kind of device-to-device D2D data transmission method, comprise determining that for indicating D2D sender of communications user equipment (UE) that whether PDCP PDCP protocol Data Unit PDU carries out the PDCP head compression instruction information that PDCP head compression processes；And/or, for indicating D2D sender of communications user equipment (UE) that whether PDCP PDCP protocol Data Unit PDU carries out the PDCP encryption indication information of PDCP encryption；Described PDCP head compression instruction information and/or described PDCP encryption indication information is sent to D2D communication receiver UE。

Preferably, in the following manner at least one, it is determined that described PDCP head compression instruction information and/or described PDCP encryption indication information: according to D2D characteristics of communications traffic determine described PDCP head compression instruction information and/or described PDCP encryption indication information and；Described PDCP head compression instruction information and/or described PDCP encryption indication information is determined according to the configuration information that described D2D sender of communications UE own base station sends；The configuration information that ProSe server belonging to described D2D sender of communications UE sends determines described PDCP head compression instruction information and/or described PDCP encryption indication information；The configuration information that application server AS belonging to described D2D sender of communications UE sends determines described PDCP head compression instruction information and/or described PDCP encryption indication information。

Preferably, by described PDCP head compression instruction information and/or described PDCP encryption indication information are carried the mode at PDCPPDU packet, described PDCP head compression instruction information and/or described PDCP encryption indication information are sent to D2D communication receiver UE。

Preferably, by described PDCP head compression instruction information and/or described PDCP encryption indication information being carried the mode of the PDCP header part in described PDCPPDU packet, send described PDCP head compression instruction information and/or described PDCP encryption indication information to D2D communication receiver UE。

Preferably, the PDCP header part in described PDCPPDU packet also include following information at least one: maxCID, profiles。

Preferably, including one below: by described PDCP head compression instruction information and/or described PDCP encryption indication information are carried the mode in the PDU type field of the PDCP header part in described PDCPPDU packet, send described PDCP head compression instruction information and/or described PDCP encryption indication information to D2D communication receiver UE；By described PDCP head compression instruction information and/or described PDCP encryption indication information are carried the mode in the safety information instructions field of the PDCP header part in described PDCPPDU packet, send described PDCP head compression instruction information and/or described PDCP encryption indication information to D2D communication receiver UE；Carrying the mode in the head compression instructions field of the PDCP header part in described PDCPPDU packet and/or in encryption instructions field by described PDCP head being compressed instruction information and/or described PDCP encryption indication information, sending described PDCP head compression instruction information and/or described PDCP encryption indication information to D2D communication receiver UE。

Preferably, the PDU type field of described PDCP header part is for indicating the type of described PDCPPDU packet, and the value of described type includes at least one of: Internet Protocol IP bag, ARP bag, use the IP bag that head compresses, the IP bag not using head to compress。

According to a further aspect in the invention, provide a kind of device-to-device D2D data transmission method, including: receive for indicating D2D sender of communications user equipment (UE) that whether PDCP PDCP protocol Data Unit PDU carries out the PDCP head compression instruction information that PDCP head compression processes；And/or, for indicating D2D sender of communications user equipment (UE) that whether PDCP PDCP protocol Data Unit PDU carries out the PDCP encryption indication information of PDCP encryption；Described PDCP head compression instruction information and/or described PDCP encryption indication information according to receiving carry out PDCP layer process。

Preferably, carry out PDCP layer according to the described PDCP head compression instruction information received and/or described PDCP encryption indication information to process and include: compress instruction information at described PDCP head and indicate described D2D sender of communications UE that described PDCPPDU carried out the compression of PDCP head and/or when described PDCP encryption indication information indicates described D2D sender of communications UE that described PDCPPDU has been carried out PDCP encryption, the PDCPPDU received carries out head decompression and/or decryption processing；When described PDCPPDU has not been carried out the compression of PDCP head by the described PDCP head compression instruction information described D2D sender of communications UE of instruction and/or described PDCP encryption indication information indicates described D2D sender of communications UE described PDCPPDU not to be carried out PDCP encryption, abandon the PDCPPDU received is carried out head decompression and/or decryption processing。

Preferably, by described PDCP head compression instruction information and/or described PDCP encryption indication information are carried the mode at PDCPPDU packet, described PDCP head compression instruction information and/or described PDCP encryption indication information are received。

Preferably, by described PDCP head compression instruction information and/or described PDCP encryption indication information being carried the mode of the PDCP header part in described PDCPPDU packet, described PDCP head compression instruction information and/or described PDCP encryption indication information are received。

Preferably, including one below: by described PDCP head compression instruction information and/or described PDCP encryption indication information are carried the mode in the PDU type field of the PDCP header part in described PDCPPDU packet, receive described PDCP head compression instruction information and/or described PDCP encryption indication information；By described PDCP head compression instruction information and/or described PDCP encryption indication information are carried the mode in the safety information instructions field of the PDCP header part in described PDCPPDU packet, send described PDCP head compression instruction information and/or described PDCP encryption indication information to D2D communication receiver UE；Carry in the PDU type field of the PDCP header part in described PDCPPDU packet by described PDCP head being compressed instruction information and/or described PDCP encryption indication information and/or encrypt the mode in instructions field, receiving described PDCP head compression instruction information and/or described PDCP encryption indication information。

Further aspect according to the present invention, it is provided that a kind of device-to-device D2D data transmission method, comprises determining that the device-to-device D2D resource pool for abnormal conditions in cell system message；D2D data transmission is carried out according to the described D2D resource pool determined。

Preferably, before carrying out D2D data transmission according to the described D2D resource pool determined, also include: detect that the D2D user equipment (UE) carrying out D2D data transmission is in the coverage of cellular cell。

Preferably, the described D2DUE community being in the coverage of cellular cell residing for described D2DUE meets community and selects S criterion, or, described D2DUE determines that the community residing for described D2DUE is suitable community。

Preferably, after carrying out D2D data transmission according to the described D2D resource pool determined, also include: judge whether to receive the wireless spread-spectrum technology RRC reconfiguration message including D2D resource allocation information；When judged result is for being, stop using the described D2D resource pool for abnormal conditions in system message。

According to an aspect of the present invention, provide a kind of device-to-device D2D data transmission device, including: first determines module, for determining for indicating D2D sender of communications user equipment (UE) that whether PDCP PDCP protocol Data Unit PDU carries out the PDCP head compression instruction information that PDCP head compression processes；And/or, for indicating D2D sender of communications user equipment (UE) that whether PDCP PDCP protocol Data Unit PDU carries out the PDCP encryption indication information of PDCP encryption；Sending module, for sending described PDCP head compression instruction information and/or described PDCP encryption indication information to D2D communication receiver UE。

Preferably, described first determines module, be additionally operable in the following manner at least one, it is determined that described PDCP head compression instruction information and/or described PDCP encryption indication information: determine described PDCP head compression instruction information and/or described PDCP encryption indication information according to D2D characteristics of communications traffic；Described PDCP head compression instruction information and/or described PDCP encryption indication information is determined according to the configuration information that described D2D sender of communications UE own base station sends；The configuration information that ProSe server belonging to described D2D sender of communications UE sends determines described PDCP head compression instruction information and/or described PDCP encryption indication information；The configuration information that application server AS belonging to described D2D sender of communications UE sends determines described PDCP head compression instruction information and/or described PDCP encryption indication information。

Preferably, described sending module, it is additionally operable to, by described PDCP head compression instruction information and/or described PDCP encryption indication information are carried the mode at PDCPPDU packet, send described PDCP head compression instruction information and/or described PDCP encryption indication information to D2D communication receiver UE。

Preferably, described sending module, being additionally operable to the mode by described PDCP head compression instruction information and/or described PDCP encryption indication information being carried the PDCP header part in described PDCPPDU packet, sending described PDCP head compression instruction information and/or described PDCP encryption indication information to D2D communication receiver UE。

Preferably, described sending module, it is additionally operable to one below: by described PDCP head compression instruction information and/or described PDCP encryption indication information are carried the mode in the PDU type field of the PDCP header part in described PDCPPDU packet, send described PDCP head compression instruction information and/or described PDCP encryption indication information to D2D communication receiver UE；By described PDCP head compression instruction information and/or described PDCP encryption indication information are carried the mode in the safety information instructions field of the PDCP header part in described PDCPPDU packet, send described PDCP head compression instruction information and/or described PDCP encryption indication information to D2D communication receiver UE；Carrying the mode in the head compression instructions field of the PDCP header part in described PDCPPDU packet and/or in encryption instructions field by described PDCP head being compressed instruction information and/or described PDCP encryption indication information, sending described PDCP head compression instruction information and/or described PDCP encryption indication information to D2D communication receiver UE。

According to a further aspect in the invention, provide a kind of device-to-device D2D data transmission device, including receiver module, for receiving for indicating D2D sender of communications user equipment (UE) that whether PDCP PDCP protocol Data Unit PDU carries out the PDCP head compression instruction information that PDCP head compression processes；And/or, for indicating D2D sender of communications user equipment (UE) that whether PDCP PDCP protocol Data Unit PDU carries out the PDCP encryption indication information of PDCP encryption；Processing module, for carrying out PDCP layer process according to the described PDCP head compression instruction information received and/or described PDCP encryption indication information。

Preferably, described processing module includes: processing unit, indicate described D2D sender of communications UE that described PDCPPDU carried out the compression of PDCP head and/or when described PDCP encryption indication information indicates described D2D sender of communications UE that described PDCPPDU has been carried out PDCP encryption for compressing instruction information at described PDCP head, the PDCPPDU received is carried out head decompression and/or decryption processing；Abandon unit, for when described PDCPPDU has not been carried out the compression of PDCP head by the described PDCP head compression instruction information described D2D sender of communications UE of instruction and/or described PDCP encryption indication information indicates described D2D sender of communications UE described PDCPPDU not to be carried out PDCP encryption, abandoning the PDCPPDU received is carried out head decompression and/or decryption processing。

Preferably, described receiver module, it is additionally operable to, by described PDCP head compression instruction information and/or described PDCP encryption indication information are carried the mode at PDCPPDU packet, receive described PDCP head compression instruction information and/or described PDCP encryption indication information。

Preferably, described receiver module, being additionally operable to the mode by described PDCP head compression instruction information and/or described PDCP encryption indication information being carried the PDCP header part in described PDCPPDU packet, receiving described PDCP head compression instruction information and/or described PDCP encryption indication information。

Preferably, described receiver module, it is additionally operable to one below: by described PDCP head compression instruction information and/or described PDCP encryption indication information are carried the mode in the PDU type field of the PDCP header part in described PDCPPDU packet, receive described PDCP head compression instruction information and/or described PDCP encryption indication information；By described PDCP head compression instruction information and/or described PDCP encryption indication information are carried the mode in the safety information instructions field of the PDCP header part in described PDCPPDU packet, send described PDCP head compression instruction information and/or described PDCP encryption indication information to D2D communication receiver UE；Carry in the PDU type field of the PDCP header part in described PDCPPDU packet by described PDCP head being compressed instruction information and/or described PDCP encryption indication information and/or encrypt the mode in instructions field, receiving described PDCP head compression instruction information and/or described PDCP encryption indication information。

Further aspect according to the present invention, it is provided that a kind of device-to-device D2D data transmission device, including: second determines module, for determining the device-to-device D2D resource pool for abnormal conditions in cell system message；Transport module, for carrying out D2D data transmission according to the described D2D resource pool determined。

Preferably, this device also includes: detection module, for detecting that the D2D subscriber equipment carrying out D2D data transmission is in the coverage of community。

Preferably, this device also includes: judge module, for judging whether to receive the wireless spread-spectrum technology RRC reconfiguration message including D2D resource allocation information；Stopping modular, for when the judged result of described judge module is for being, stopping using the described D2D resource pool for abnormal conditions in system message。

In accordance with a further aspect of the present invention, it is provided that a kind of device-to-device D2D user equipment (UE), including the device described in any of the above-described item。

By the present invention, adopt and determine for indicating D2D sender of communications user equipment (UE) that whether PDCP PDCP protocol Data Unit PDU carries out the PDCP head compression instruction information that PDCP head compression processes；And/or, for indicating D2D sender of communications user equipment (UE) that whether PDCP PDCP protocol Data Unit PDU carries out the PDCP encryption indication information of PDCP encryption；Described PDCP head compression instruction information and/or described PDCP encryption indication information is sent to D2D communication receiver UE, solve the problem that in correlation technique, recipient D2DUE cannot correctly resolve D2D communication data, and then reached D2D communication receiver UE acquisition PDCP head compression instruction information and/or described PDCP encryption indication information, it is possible to the correct effect resolving D2D communication data。

Accompanying drawing explanation

Accompanying drawing described herein is used for providing a further understanding of the present invention, constitutes the part of the application, and the schematic description and description of the present invention is used for explaining the present invention, is not intended that inappropriate limitation of the present invention。In the accompanying drawings:

Fig. 1 is the application model schematic diagram of D2D technology in correlation technique；

Fig. 2 is the flow chart of device-to-device D2D data transmission method one according to embodiments of the present invention；

Fig. 3 is the flow chart of device-to-device D2D data transmission method two according to embodiments of the present invention；

Fig. 4 is the flow chart of device-to-device D2D data transmission method three according to embodiments of the present invention；

Fig. 5 is the structured flowchart of device-to-device D2D data transmission device one according to embodiments of the present invention；

Fig. 6 is the structured flowchart of device-to-device D2D data transmission device two according to embodiments of the present invention；

Fig. 7 is the preferred structure block diagram of processing module 64 in device-to-device D2D data transmission device two according to embodiments of the present invention；

Fig. 8 is the structured flowchart of device-to-device D2D data transmission device three according to embodiments of the present invention；

Fig. 9 is the preferred structure block diagram of device-to-device D2D data transmission device three according to embodiments of the present invention；

Figure 10 is the preferred structure block diagram two of device-to-device D2D data transmission device three according to embodiments of the present invention；

Figure 11 is the structured flowchart of D2DUE according to embodiments of the present invention；

Figure 12 is the flow chart according to the preferred embodiment of the present invention one；

Figure 13 is D2D communication PDCPPDU data packet format schematic diagram according to embodiments of the present invention；

Figure 14 is the flow chart according to the preferred embodiment of the present invention two；

Figure 15 is scene schematic diagram according to the preferred embodiment of the invention；

Figure 16 is the method schematic diagram according to the preferred embodiment of the present invention three。

Detailed description of the invention

Below with reference to accompanying drawing and describe the present invention in detail in conjunction with the embodiments。It should be noted that when not conflicting, the embodiment in the application and the feature in embodiment can be mutually combined。

Providing a kind of device-to-device D2D data transmission method in the present embodiment, Fig. 2 is the flow chart of device-to-device D2D data transmission method one according to embodiments of the present invention, as in figure 2 it is shown, this flow process comprises the steps:

Step S202, it is determined that for indicating D2D sender of communications user equipment (UE) that whether PDCP PDCP protocol Data Unit PDU carries out the PDCP head compression instruction information that PDCP head compression processes；And/or, for indicating D2D sender of communications user equipment (UE) that whether PDCP PDCP protocol Data Unit PDU carries out the PDCP encryption indication information of PDCP encryption；PDCP head compression instruction information and/or PDCP encryption indication information is sent to D2D communication receiver UE；

Step S204, sends PDCP head compression instruction information and/or PDCP encryption indication information to D2D communication receiver UE。

By above-mentioned steps, D2D sender of communications to D2D communication receiver send that this D2D sender of communications determines for indicating D2D sender of communications user equipment (UE) that whether PDCP PDCP protocol Data Unit PDU carries out the PDCP head compression instruction information that PDCP head compression processes；And/or, for indicating D2D sender of communications user equipment (UE) that whether PDCP PDCP protocol Data Unit PDU carries out the PDCP encryption indication information of PDCP encryption, solve the problem that in correlation technique, recipient D2DUE cannot correctly resolve D2D communication data, and then reached D2D communication receiver UE acquisition PDCP head compression instruction information and/or PDCP encryption indication information, it is possible to the correct effect resolving D2D communication data。

When determining for indicate D2D sender of communications user equipment (UE) whether PDCP PDCP protocol Data Unit PDU to be carried out PDCP head compression instruction information and/or PDCP encryption indication information that PDCP head compression processes, various ways can be adopted, for example, it is possible in the following manner at least one: determine PDCP head compression instruction information and/or PDCP encryption indication information according to D2D characteristics of communications traffic；PDCP head compression instruction information and/or PDCP encryption indication information is determined according to the configuration information that D2D sender of communications UE own base station sends；The configuration information that ProSe server belonging to D2D sender of communications UE sends determines PDCP head compression instruction information and/or PDCP encryption indication information；The configuration information that application server AS belonging to D2D sender of communications UE sends determines PDCP head compression instruction information and/or PDCP encryption indication information。

Various ways can also be adopted when sending PDCP head compression instruction information and/or PDCP encryption indication information to D2D communication receiver UE, such as, by PDCP head compression instruction information and/or PDCP encryption indication information are carried the mode at PDCPPDU packet, PDCP head compression instruction information and/or PDCP encryption indication information can be sent to D2D communication receiver UE。

Preferably, it is possible to by PDCP head compression instruction information and/or PDCP encryption indication information being carried the mode of the PDCP header part in PDCPPDU packet, send PDCP head compression instruction information and/or PDCP encryption indication information to D2D communication receiver UE。Wherein, the PDCP header part in above-mentioned PDCPPDU packet can also include following information at least one: maxCID, profiles。

More preferably, in the mode by PDCP head compression instruction information and/or PDCP encryption indication information being carried the PDCP header part in PDCPPDU packet, when sending PDCP head compression instruction information and/or PDCP encryption indication information to D2D communication receiver UE, by PDCP head compression instruction information and/or PDCP encryption indication information are carried the mode in the PDU type field of the PDCP header part in PDCPPDU packet, PDCP head compression instruction information and/or PDCP encryption indication information can be sent to D2D communication receiver UE；Or by PDCP head compression instruction information and/or PDCP encryption indication information are carried the mode in the safety information instructions field of the PDCP header part in PDCPPDU packet, send PDCP head compression instruction information and/or PDCP encryption indication information to D2D communication receiver UE；The mode in the head compression instructions field of the PDCP header part in PDCPPDU packet and/or in encryption instructions field can also be carried by PDCP head being compressed instruction information and/or PDCP encryption indication information, send PDCP head compression instruction information and/or PDCP encryption indication information to D2D communication receiver UE。

Wherein, the PDU type field of above-mentioned PDCP header part is for indicating the type of PDCPPDU packet, and the value of type can include at least one of: Internet Protocol IP bag, ARP bag, use the IP bag that head compresses, the IP bag not using head to compress。

In the present embodiment, additionally providing a kind of device-to-device D2D data transmission method, Fig. 3 is the flow chart of device-to-device D2D data transmission method two according to embodiments of the present invention, as it is shown on figure 3, this flow process comprises the steps:

Step S302, receives for indicating D2D sender of communications user equipment (UE) that whether PDCP PDCP protocol Data Unit PDU carries out the PDCP head compression instruction information that PDCP head compression processes；And/or, for indicating D2D sender of communications user equipment (UE) that whether PDCP PDCP protocol Data Unit PDU carries out the PDCP encryption indication information of PDCP encryption；

Step S304, PDCP head compression instruction information and/or PDCP encryption indication information according to receiving carry out PDCP layer process。

By above-mentioned steps, D2D communication receiver receive that D2D sender of communications determines for indicating D2D sender of communications user equipment (UE) that whether PDCP PDCP protocol Data Unit PDU carries out the PDCP head compression instruction information that PDCP head compression processes；And/or, for indicating D2D sender of communications user equipment (UE) that whether PDCP PDCP protocol Data Unit PDU carries out the PDCP encryption indication information of PDCP encryption, compress instruction information according to this PDCP head and/or PDCP encryption indication information carries out PDCP layer process, solve the problem that in correlation technique, recipient D2DUE cannot correctly resolve D2D communication data, and then reached D2D communication receiver UE acquisition PDCP head compression instruction information and/or PDCP encryption indication information, it is possible to the correct effect resolving D2D communication data。

Preferably, carry out PDCP layer according to the PDCP head compression instruction information received and/or PDCP encryption indication information to process and include: compress that PDCPPDU has been carried out the compression of PDCP head by instruction information instruction D2D sender of communications UE and/or PDCP encryption indication information instruction D2D sender of communications UE at PDCP head and carried out, in PDCP encryption situation, the PDCPPDU received carrying out head decompression and/or decryption processing to PDCPPDU；When PDCPPDU has not been carried out the compression of PDCP head by PDCP head compression instruction information instruction D2D sender of communications UE and/or PDCP encryption indication information instruction D2D sender of communications UE PDCPPDU is not carried out PDCP encryption, abandon the PDCPPDU received is carried out head decompression and/or decryption processing。

When receiving PDCP head compression instruction information and/or PDCP encryption indication information, various ways can be adopted, such as, by PDCP head compression instruction information and/or PDCP encryption indication information are carried the mode at PDCPPDU packet, PDCP head compression instruction information and/or PDCP encryption indication information can be received。

Preferably, by PDCP head compression instruction information and/or PDCP encryption indication information are carried the mode at PDCPPDU packet, when receiving PDCP head compression instruction information and/or PDCP encryption indication information, by PDCP head compression instruction information and/or PDCP encryption indication information being carried the mode of the PDCP header part in PDCPPDU packet, PDCP head compression instruction information and/or PDCP encryption indication information can be received。Wherein, the PDCP header part in this PDCPPDU packet can also include following information at least one: maxCID, profiles。

Preferably, in the mode by PDCP head compression instruction information and/or PDCP encryption indication information being carried the PDCP header part in PDCPPDU packet, when receiving PDCP head compression instruction information and/or PDCP encryption indication information, by PDCP head compression instruction information and/or PDCP encryption indication information are carried the mode in the PDU type field of the PDCP header part in PDCPPDU packet, PDCP head compression instruction information and/or PDCP encryption indication information can be received；Or by PDCP head compression instruction information and/or PDCP encryption indication information are carried the mode in the safety information instructions field of the PDCP header part in PDCPPDU packet, send PDCP head compression instruction information and/or PDCP encryption indication information to D2D communication receiver UE；By carrying in the PDU type field of the PDCP header part in PDCPPDU packet by PDCP head compression instruction information and/or PDCP encryption indication information and/or the mode in instructions field can also be encrypted, receive PDCP head compression instruction information and/or PDCP encryption indication information。

Wherein, the PDU type field of this PDCP header part is for indicating the type of PDCPPDU packet, and the value of type can include at least one of: Internet Protocol IP bag, ARP bag, use the IP bag that head compresses, the IP bag not using head to compress。

In the present embodiment, additionally providing a kind of device-to-device D2D data transmission method, Fig. 4 is the flow chart of device-to-device D2D data transmission method three according to embodiments of the present invention, and as shown in Figure 4, this flow process comprises the steps:

Step S402, it is determined that the device-to-device D2D resource pool for abnormal conditions in cell system message；

Step S404, carries out D2D data transmission according to the D2D resource pool determined。

Pass through above-mentioned steps, the D2D resource pool being used for abnormal conditions in cell system message is used for the transmission of D2D data, relative in correlation technique, D2D communicates outside UE is covered by cellular network and moves to the scene of cellular network coverage area, cause that D2D communication service is interrupted, solve at least the problem of D2D service disconnection in correlation technique, effectively improve Consumer's Experience。

Before carrying out D2D data transmission according to the D2D resource pool determined, also include: detect that the D2D user equipment (UE) carrying out D2D data transmission is in the coverage of cellular cell。Wherein it is desired to illustrate, the D2DUE community being in the coverage of cellular cell residing for D2DUE meets community and selects S criterion, or, D2DUE determines that the community residing for D2DUE is suitable community。

After carrying out D2D data transmission according to the D2D resource pool determined, also include: judge whether to receive the wireless spread-spectrum technology RRC reconfiguration message including D2D resource allocation information；When judged result is for being, stop using the D2D resource pool for abnormal conditions in system message。

Additionally providing a kind of device-to-device D2D data transmission device in the present embodiment, this device is used for realizing above-described embodiment and preferred implementation, has be carried out repeating no more of explanation。As used below, term " module " can realize the software of predetermined function and/or the combination of hardware。Although the device described by following example preferably realizes with software, but hardware, or the realization of the combination of software and hardware is also likely to and is contemplated。

Fig. 5 is the structured flowchart of device-to-device D2D data transmission device one according to embodiments of the present invention, as it is shown in figure 5, this device includes: first determines module 52 and sending module 54, below this device is illustrated。

First determines module 52, for determining for indicating D2D sender of communications user equipment (UE) that whether PDCP PDCP protocol Data Unit PDU carries out the PDCP head compression instruction information that PDCP head compression processes；And/or, for indicating D2D sender of communications user equipment (UE) that whether PDCP PDCP protocol Data Unit PDU carries out the PDCP encryption indication information of PDCP encryption；Sending module 54, is connected to above-mentioned first and determines module 52, for sending PDCP head compression instruction information and/or PDCP encryption indication information to D2D communication receiver UE。

Above-mentioned first determines module 52, be additionally operable in the following manner at least one, it is determined that PDCP head compression instruction information and/or the PDCP encryption indication information whether PDCP head compression processes for indicating D2D sender of communications user equipment (UE) PDCP PDCP protocol Data Unit PDU to be carried out: determine PDCP head compression instruction information and/or PDCP encryption indication information according to D2D characteristics of communications traffic；PDCP head compression instruction information and/or PDCP encryption indication information is determined according to the configuration information that D2D sender of communications UE own base station sends；The configuration information that ProSe server belonging to D2D sender of communications UE sends determines PDCP head compression instruction information and/or PDCP encryption indication information；The configuration information that application server AS belonging to D2D sender of communications UE sends determines PDCP head compression instruction information and/or PDCP encryption indication information。

Preferably, above-mentioned sending module 54, it is additionally operable to, by PDCP head compression instruction information and/or PDCP encryption indication information are carried the mode at PDCPPDU packet, send PDCP head compression instruction information and/or PDCP encryption indication information to D2D communication receiver UE。

Preferably, above-mentioned sending module 54, being additionally operable to the mode by PDCP head compression instruction information and/or PDCP encryption indication information being carried the PDCP header part in PDCPPDU packet, sending PDCP head compression instruction information and/or PDCP encryption indication information to D2D communication receiver UE。

Wherein, the PDCP header part in above-mentioned PDCPPDU packet also include following information at least one: maxCID, profiles。

Preferably, above-mentioned sending module, it is additionally operable to, by PDCP head compression instruction information and/or PDCP encryption indication information are carried the mode in the PDU type field of the PDCP header part in PDCPPDU packet, send PDCP head compression instruction information and/or PDCP encryption indication information to D2D communication receiver UE；Or by PDCP head compression instruction information and/or PDCP encryption indication information are carried the mode in the safety information instructions field of the PDCP header part in PDCPPDU packet, send PDCP head compression instruction information and/or PDCP encryption indication information to D2D communication receiver UE；The mode in the head compression instructions field of the PDCP header part in PDCPPDU packet and/or in encryption instructions field can also be carried by PDCP head being compressed instruction information and/or PDCP encryption indication information, send PDCP head compression instruction information and/or PDCP encryption indication information to D2D communication receiver UE。

Wherein, the PDU type field of PDCP header part is for indicating the type of PDCPPDU packet, and the value of type includes at least one of: Internet Protocol IP bag, ARP bag, use the IP bag that head compresses, the IP bag not using head to compress。

Fig. 6 is the structured flowchart of device-to-device D2D data transmission device two according to embodiments of the present invention, and as shown in Figure 6, this device includes: receiver module 62 and processing module 64, below this device is illustrated。

Receiver module 62, for receiving for indicating D2D sender of communications user equipment (UE) that whether PDCP PDCP protocol Data Unit PDU carries out the PDCP head compression instruction information that PDCP head compression processes；And/or, for indicating D2D sender of communications user equipment (UE) that whether PDCP PDCP protocol Data Unit PDU carries out the PDCP encryption indication information of PDCP encryption；Processing module 64, is connected to above-mentioned receiver module 62, for carrying out PDCP layer process according to the PDCP head compression instruction information received and/or PDCP encryption indication information。

Fig. 7 is the preferred structure block diagram of processing module 64 in device-to-device D2D data transmission device two according to embodiments of the present invention, as it is shown in fig. 7, this processing module 64 includes: processing unit 72 and abandon unit 74, below this processing module 64 is illustrated。

Processing unit 72, PDCPPDU carried out the compression of PDCP head and/or when PDCPPDU has been carried out PDCP encryption indication information instruction D2D sender of communications UE PDCP encryption for compressing instruction information instruction D2D sender of communications UE at PDCP head, the PDCPPDU received has been carried out head decompression and/or decryption processing；Abandon unit 74, for when PDCPPDU has not been carried out the compression of PDCP head by PDCP head compression instruction information instruction D2D sender of communications UE and/or PDCP encryption indication information instruction D2D sender of communications UE PDCPPDU is not carried out PDCP encryption, abandoning the PDCPPDU received is carried out head decompression and/or decryption processing。

Preferably, above-mentioned receiver module 62, it is additionally operable to, by PDCP head compression instruction information and/or PDCP encryption indication information are carried the mode at PDCPPDU packet, receive PDCP head compression instruction information and/or PDCP encryption indication information。

Preferably, above-mentioned receiver module 62, being additionally operable to the mode by PDCP head compression instruction information and/or PDCP encryption indication information being carried the PDCP header part in PDCPPDU packet, receiving PDCP head compression instruction information and/or PDCP encryption indication information。

Wherein, the PDCP header part in above-mentioned PDCPPDU packet can also include following information at least one: maxCID, profiles。

Preferably, above-mentioned receiver module 62, it is additionally operable to one below: by PDCP head compression instruction information and/or PDCP encryption indication information are carried the mode in the PDU type field of the PDCP header part in PDCPPDU packet, receive PDCP head compression instruction information and/or PDCP encryption indication information；By PDCP head compression instruction information and/or PDCP encryption indication information are carried the mode in the safety information instructions field of the PDCP header part in PDCPPDU packet, PDCP head compression instruction information and/or PDCP encryption indication information is sent to D2D communication receiver UE, carry in the PDU type field of the PDCP header part in PDCPPDU packet by PDCP head being compressed instruction information and/or PDCP encryption indication information and/or encrypt the mode in instructions field, receiving PDCP head compression instruction information and/or PDCP encryption indication information。

Preferably, the PDU type field of above-mentioned PDCP header part is for indicating the type of PDCPPDU packet, and the value of type includes at least one of: Internet Protocol IP bag, ARP bag, use the IP bag that head compresses, the IP bag not using head to compress。

Fig. 8 is the structured flowchart of device-to-device D2D data transmission device three according to embodiments of the present invention, and as shown in Figure 8, this device includes: second determines module 82 and transport module 84, below this device is illustrated。

Second determines module 82, for determining the device-to-device D2D resource pool for abnormal conditions in cell system message；Transport module 84, is connected to above-mentioned second and determines module 82, for carrying out D2D data transmission according to the D2D resource pool determined。

Fig. 9 is the preferred structure block diagram one of device-to-device D2D data transmission device three according to embodiments of the present invention, as it is shown in figure 9, this device is except including all modules shown in Fig. 8, also includes detection module 92, below this detection module 92 is illustrated。

Detection module 92, is connected to above-mentioned second and determines module 82 and transport module 84, for detecting that the D2D subscriber equipment carrying out D2D data transmission is in the coverage of community。

Preferably, D2DUE is in the coverage of cellular cell can meet community selection S criterion in the community residing for D2DUE, or, D2DUE determines that the community residing for D2DUE is suitable community。

Figure 10 is the preferred structure block diagram two of device-to-device D2D data transmission device three according to embodiments of the present invention, as shown in Figure 10, this device, except including all modules shown in Fig. 8, also includes judge module 102 and stopping modular 104, below this device is illustrated。

Judge module 102, is connected to above-mentioned transport module 84, for judging whether to receive the wireless spread-spectrum technology RRC reconfiguration message including D2D resource allocation information；Stopping modular 104, is connected to above-mentioned judge module 102, for when the judged result of judge module is for being, stopping using the D2D resource pool for abnormal conditions in system message。

Figure 11 is the structured flowchart of D2DUE according to embodiments of the present invention, and as shown in figure 11, this D2DUE112 includes the D2D data transmission device 3 114 of any of the above-described。

For in correlation technique, the D2DUE carrying out D2D communication moves to the scene of cellular network coverage area from without cellular network coverage area, the problem how improving D2D business continuance, and the problem how D2D recipient UE obtains D2D radio bearer PDCP layer parameter。

By the D2D data transmission method that above-described embodiment of the embodiment of the present invention and preferred implementation provide, D2DUE can be made to obtain the resource sent for D2D communication data in time, effectively reduce the time delay of D2D communication service, ensure D2D communication service seriality, and make D2D recipient UE obtain D2D radio bearer PDCP layer parameter, correctly to resolve D2D communication data, promote D2D QoS and Consumer's Experience。Below this D2D data transmission method is illustrated。

This D2D data transmission method includes: PDCP head is compressed D2D sender of communications UE instruction information and/or PDCP encryption indication information is sent to D2D communication receiver UE；D2D communication receiver UE compresses instruction information according to head and carries out PDCP layer process。

Wherein, above-mentioned PDCP head compression instruction information is used for indicating D2D sender of communications UE that whether PDCPPDU carries out PDCP head compression；Above-mentioned PDCP encryption indication information is used for indicating whether D2D sender of communications UE carries out PDCP encryption to PDCPPDU。

Preferably, PDCP head compression instruction information and/or PDCP encryption indication information can be sent to D2D communication receiver UE by PDCPPDU packet by D2D sender of communications UE。

When PDCP head compression instruction information and/or PDCP encryption indication information are sent to D2D communication receiver UE by PDCPPDU packet by D2D sender of communications UE, more preferably, PDCP head compression instruction information and/or PDCP encryption indication information can be included in the PDCP header part in PDCPPDU by this D2D sender of communications UE。It should be noted that the PDCP header part in above-mentioned PDCPPDU can also comprise following information at least one: maxCID, profiles。

Preferably, when PDCP head is compressed the PDCP header part that instruction information and/or PDCP encryption indication information are included in PDCPPDU by D2D sender of communications UE, in the PDU type field that PDCP head can be compressed instruction information by this D2D sender of communications UE and/or PDCP encryption indication information be included in PDCPPDU PDCP header part。Or by PDCP head compression instruction information and/or PDCP encryption indication information are carried the mode in the safety information instructions field of the PDCP header part in PDCPPDU packet, send PDCP head compression instruction information and/or PDCP encryption indication information to D2D communication receiver UE；The mode in the head compression instructions field of the PDCP header part in PDCPPDU packet and/or in encryption instructions field can also be carried by PDCP head being compressed instruction information and/or PDCP encryption indication information, send PDCP head compression instruction information and/or PDCP encryption indication information to D2D communication receiver UE。Wherein, this PDU type field is for indicating the type of PDCPPDU packet, and value can be one below: IP bag, ARP bag, uses the IP bag of head compression, does not use the IP bag that head compresses。

It should be noted that, before PDCP head compression instruction information and/or PDCP encryption indication information are sent to D2D communication receiver UE by D2D sender of communications UE, this PDCP head compression instruction information and/or PDCP encryption indication information can also be determined in several ways, for example, it is possible at least one is determined in the following manner: D2D sender of communications UE determines PDCP head compression instruction information and/or PDCP encryption indication information voluntarily according to D2D characteristics of communications traffic；D2D sender of communications UE determines PDCP head compression instruction information and/or PDCP encryption indication information according to base station configuration；D2D sender of communications UE determines PDCP head compression instruction information and/or PDCP encryption indication information according to ProSe server or application server configuration。

When D2D communication receiver UE carries out the process of PDCP layer according to above-mentioned head compression instruction information, including: head compression instruction information instruction D2D sender of communications UE PDCPPDU having carried out the compression of PDCP head and/or when PDCPPDU has been carried out PDCP encryption indication information instruction D2D sender of communications UE PDCP encryption, the PDCPPDU received need to be carried out head decompression and/or decryption processing by D2D communication receiver UE；PDCPPDU is not carried out PDCP head compression and/or PDCP encryption indication information instruction D2D sender of communications UE when PDCPPDU not being carried out PDCP encryption by head compression instruction information instruction D2D sender of communications UE, and the PDCPPDU received is not carried out head decompression and/or decryption processing by D2D communication receiver UE。

In the present embodiment, additionally provide a kind of D2D data transmission method, including: D2DUE uses the D2D resource pool for abnormal conditions in cell system message to send for D2D communication。

D2DUE uses the D2D resource pool for abnormal conditions in cell system message to include for D2D communication transmission: D2DUE detects that it is in the coverage of community, Ji Gai community meets community and selects S criterion, or, D2DUE determines that the community residing for D2DUE is suitable community。

D2DUE detects that it is in the covering of this community, it is possible to adopt various ways, for instance, it is possible in the following ways, D2DUE detects that this community meets community and selects S criterion。

Before D2DUE uses the D2D resource pool for abnormal conditions in cell system message to send for D2D communication, it is also possible to including: D2DUE receives the D2D resource pool information for abnormal conditions in this cell system message。

Additionally, after D2DUE uses the D2D resource pool for abnormal conditions in cell system message to send for D2D communication, can also include: if D2DUE receives the RRC reconfiguration message comprising D2D resource allocation information, then D2DUE stops using the D2D resource pool for abnormal conditions in system message。

By above-described embodiment and preferred implementation, solve the D2DUE carrying out D2D communication to move to the scene of cellular network coverage area from without cellular network coverage area, the problem how improving D2D business continuance, and the problem how D2D recipient UE obtains D2D radio bearer PDCP layer parameter。Compared with correlation technique, D2DUE can be made to obtain the resource sent for D2D communication data in time, effectively reduce the time delay of D2D communication service, ensure D2D communication service seriality, and make D2D recipient UE obtain D2D radio bearer PDCP layer parameter, correctly to resolve D2D communication data, promote D2D QoS and Consumer's Experience。

Below the preferred embodiment of the present invention is illustrated。

Method preferred embodiment one

What this preferred embodiment described is the sender D2DUE method that head compression instruction is sent to recipient D2DUE。Figure 12 is the flow chart according to the preferred embodiment of the present invention one, and as shown in figure 12, this flow process comprises the following steps:

Step 1, D2D sender UE determines PDCP head compression instruction information voluntarily according to D2D characteristics of communications traffic；Or, D2D sender of communications UE determines PDCP head compression instruction information according to base station configuration, and base station can be D2D sender UE configuration by the proprietary signaling of RRC；Or, D2D sender of communications UE determines PDCP head compression instruction information according to ProSe server or application server configuration；Concrete, PDCP head compression instruction information is used for indicating D2D sender of communications UE that whether PDCPPDU carries out PDCP head compression。Concrete。Need to carry out PDCP head compression if D2D sender of communications UE determines, in addition it is also necessary to determine parameter information that PDCP head compresses (such as, maxCID (upper-layer configured), profiles etc.)。Similar, the parameter information of PDCP head compression also can be determined by D2D sender of communications UE voluntarily, or is configured by base station, or by ProSe server or application server configuration。The parameter information of PDCP head compression can also be determined particular value by agreement。It should be noted that PDCP head compresses only for IP packet。

Step 2, head is compressed instruction information and is sent to D2D communication receiver UE by D2D sender of communications UE。PDCP head is compressed instruction information by PDCPPDU packet and is sent to D2D communication receiver UE by D2D sender of communications UE。Concrete, PDCP head can be compressed instruction information and be included in the PDCP header part in PDCPPDU by D2D sender of communications UE。PDCP head compression instruction information can be indicated by newly-increased PDCP head compression instructions field, and this PDCP head compression instructions field can be 1 bit, for instance, value 0 represents and does not use PDCP head to compress, and value 1 represents and uses the compression of PDCP head；Or, D2D sender of communications UE can indicate head compression instruction information by the PDU type field of PDCP header part in PDCPPDU。Figure 13 is D2D communication PDCPPDU data packet format schematic diagram according to embodiments of the present invention, as shown in figure 13, wherein Layer-3PDUType territory and PDU type field, for indicating the type of D2D communication PDCPPDU packet, its value can be one below: IP bag, ARP bag, uses the IP bag of head compression, does not use the IP bag that head compresses。If value is use the IP bag of head compression, then it represents that this PDCPPDU employs the compression of PDCP head, otherwise, represents that this PDCPPDU does not use PDCP head to compress。Table 1 is the value example in Layer-3PDUType territory, and as shown in table 1, value 000 can represent that this PDCPPDU is the IP bag using head compression, and value 001 can represent that this PDCPPDU is the IP bag not using head to compress。Optionally, the PDCP header part in PDCPPDU also can comprise following PDCP compressed parameter information: maxCID and/or profiles。

Table 1:Layer-3PDUType value

Bit	Description
		000	Use the IP bag of head compression
001	Do not use the IP bag that head compresses
		010	ARP
011-111	reserved

Step 3, recipient D2DUE compresses instruction information according to head and carries out PDCP layer process。Concrete, when this PDCPPDU has been carried out the compression of PDCP head by head compression instruction information instruction D2D sender of communications UE, the PDCPPDU received need to be carried out head decompression by D2D communication receiver UE；When this PDCPPDU is not carried out PDCP head compression by head compression instruction information instruction D2D sender of communications UE, the PDCPPDU received is not carried out head decompression by D2D communication receiver UE。

Method preferred embodiment two

What this preferred embodiment described is the sender D2DUE method that the encryption instruction of PDCP layer is sent to recipient D2DUE。Figure 14 is the flow chart according to the preferred embodiment of the present invention two, and as shown in figure 14, this flow process comprises the following steps:

Step 1, D2D sender UE determines whether PDCP data PDU is encrypted according to D2D characteristics of communications traffic voluntarily；Or, D2D sender of communications UE determines whether to perform the encryption of PDCP layer according to base station configuration, and base station can be D2D sender UE configuration by the proprietary signaling of RRC；Or, D2D sender of communications UE determines whether to carry out PDCP layer encryption according to ProSe server or application server configuration；

Step 2, PDCP encryption indication information is sent to D2D communication receiver UE by D2D sender of communications UE。PDCP encryption indication information is sent to D2D communication receiver UE by PDCPPDU packet by D2D sender of communications UE。Concrete, PDCP encryption indication information can be included in the PDCP header part in PDCPPDU by D2D sender of communications UE。As one way in which, D2D sender of communications UE can be indicated by the PDU type field of PDCP header part in PDCPPDU and add confidential information。Figure 13 is D2D communication PDCPPDU data packet format schematic diagram according to embodiments of the present invention, and as shown in figure 13, wherein Layer-3PDUType territory and PDU type field, for indicating the type of D2D communication PDCPPDU packet。Table 2 is the value example in Layer-3PDUType territory, and as shown in table 2, Layer-3PDUType territory is made up of three bits, can be indicated respectively whether this PDCPPDU uses head to compress by two of which bit, or whether use encryption。Such as, value 000 can represent that this PDCPPDU does not use head to compress, and this PDCPPDU does not use head compression but uses encryption not to use encryption, value 001 to represent, value 010 represents that this PDCPPDU uses head compression but do not use encryption, and value 011 represents that this PDCPPDU uses head compression and uses encryption。

Or, D2D sender of communications UE can be indicated by the newly-increased encryption instructions field of PDCP header part in PDCPPDU and add confidential information。This encryption instructions field can be 1 bit, for instance, value 0 represents and does not use encryption, and value 1 represents and uses encryption。

Or, D2D sender of communications UE can pass through the newly-increased territory (such as safety information instructions field) of PDCP header part in PDCPPDU and indicates head compression and/or add confidential information。This newly-increased territory can form for dibit position, and each bit indicates respectively whether this PDCPPDU uses head to compress, and/or whether uses encryption。Such as, value 00 can represent that this PDCPPDU does not use head to compress, and this PDCPPDU does not use head compression but uses encryption not to use encryption, value 01 to represent, value 10 represents that this PDCPPDU uses head compression but do not use encryption, and value 11 represents that this PDCPPDU uses head compression and uses encryption。

Table 2:Layer-3PDUType value

Bit	Description
		000	Do not use head to compress, do not use encryption
001	Do not use head to compress, use encryption
		010	Use head compresses, and does not use encryption
011	Use head compresses, and uses encryption
		100	ARP
101-111	reserved

Step 3, recipient D2DUE carries out PDCP layer process according to encryption indication information。Concrete, when this PDCPPDU has been carried out the encryption of PDCP layer by encryption indication information instruction D2D sender of communications UE, the PDCPPDU received need to be carried out head decryption processing by D2D communication receiver UE；When this PDCPPDU is not carried out PDCP layer encryption by encryption indication information instruction D2D sender of communications UE, the PDCPPDU received is not carried out PDCP layer decryption processing by D2D communication receiver UE。

Method preferred embodiment three

What this preferred embodiment described is move, the UE carrying out D2D communication covers from cellular network, the method obtaining available D2D resource to cellular network in the process in covering, Figure 15 is scene schematic diagram according to the preferred embodiment of the invention, as shown in figure 15, the D2DUE1 being in outside cellular network covers is carrying out D2D communication, and it uses pre-configured mode2 resource pool (obtaining resource by competitive way from this resource pool) to carry out the transmission of D2D communication data。Further, D2DUE1 moves in the coverage of 1 community, base station from cellular network covering exterior domain。Figure 16 is the method schematic diagram according to the preferred embodiment of the present invention three, and as shown in figure 16, D2DUE1 experiences following several stages in moving process, and its D2D communication resource situation used in each stage is as follows:

Stage 1:D2DUE is in without cellular network coverage area, and now UE uses the pre-configured mode2D2D communication resource。Now UE moves in the cellular network coverage area of base station 1。

Stage 2:UE detects that community, 1 time, base station 1 meets foot community and selects S criterion, assuming that the frequency of the community 1 D2D resource pool frequency pre-configured with this UE is identical, now UE need to stop using pre-configured D2D communication resource pond, to avoid the cellular communication in community 1 is interfered。Then, UE will attempt the D2D resource pool information (this D2D resource pool is in normal situation and/or abnormal conditions) read in this community in SIB。Assuming that this community SIB comprises D2D communication resource pond information, then UE from detect this community meet S criterion or meet suitablecell criterion to UE read SIB D2D resource pool information during this period of time in for the stage 2, UE without available D2D resource, interrupts the transmission of D2D communication data when stage 2。In this stage, if only comprising the mode2 resource pool for abnormal conditions in SIB, or contain the mode2 resource pool for normal situation in SIB but UE goes for mode1 resource, then UE initiates RRC connection establishment process and attempts setting up RRC with base station and be connected。

Stage 3:UE reads in SIB after D2D resource pool information, recovers the transmission of D2D communication data。UE from read D2D resource SIB to UE complete RRC connection establishment process and receive the RRC reconfiguration message comprising D2D resource distribution (mode1 and/or mode2) time in be called the stage 3, in this stage, UE uses mode2 resource in SIB to carry out the transmission of D2D communication。

Stage 4:UE carries out D2D communication according to this resource allocation information after getting the D2D resource allocation information (can be mode1 configuration information or mode2 resource pool information) that base station is sent by proprietary signaling。

It should be noted that D2DUE is only when (Ji Gai community meets community and selects S criterion or meet suitablecell criterion) in the coverage being in community, could use the D2D communication mode2 resource for normal or abnormal conditions of this community。Once this UE detects that this community is unsatisfactory for S criterion or suitablecell criterion, stop using the D2D communication mode2 resource for normal or abnormal conditions of this community。

Except above scene, further contemplate UE and move to half mulching region from covering exterior domain, then move again to the scene covering inner region, wherein half mulching region refers to that UE is not detected by community and meets S criterion or suitablecell criterion, but can receive from covering interior or covering the outer UE D2DSS (D2DSS sequence is belonging respectively to set D2DSSue_net or set D2DSSue_oon) sent and PD2DSCH。Under this scene, when UE is in covering outer state, pre-configured D2D resource pool is used to carry out D2D communication, when UE moves to when detecting that it is in half mulching state, namely UE receives from covering interior or covering outer UE D2DSS and PD2DSCH sent, then this UE uses and carries out D2D communication from the PD2DSCH D2D resource pool received。When UE moves to covering inner region, namely detect when certain community meets S criterion or meets suitablecell criterion, UE obtains the D2D resource pool in SIB (for normal condition or abnormal conditions, this resource pool is likely to identical or different with resource pool in PD2DSCH) after, use D2D resource pool in this SIB to carry out D2D communication。

Additionally, consider that UE moves to half mulching region from covering inner region, then move again to the scene covering exterior domain, identical, wherein half mulching region refers to that UE is not detected by community and meets S criterion or suitablecell criterion, but can receive from covering interior or covering the outer UE D2DSS (D2DSS sequence is belonging respectively to set D2DSSue_net or set D2DSSue_oon) sent and PD2DSCH。Under this scene, when UE is in state in covering, if detecting, certain community meets S criterion or meets suitablecell criterion, and UE uses D2D resource pool in this SIB to carry out D2D communication after obtaining the D2D resource pool (for normal condition or abnormal conditions) in SIB。When UE detects and is in half mulching state; namely UE is presently in position and is unsatisfactory for covering interior criterion; but UE receives from covering or cover outer UE D2DSS and PD2DSCH sent, then this UE use receives from PD2DSCH D2D resource pool (this resource pool be likely to SIB for normal or abnormal conditions resource pool is identical or different) carry out D2D communication。When UE moves to covering exterior domain, this UE uses pre-configured D2D resource to carry out D2D communication。

Obviously, those skilled in the art should be understood that, each module of the above-mentioned present invention or each step can realize with general calculation element, they can concentrate on single calculation element, or it is distributed on the network that multiple calculation element forms, alternatively, they can realize with the executable program code of calculation element, thus, can be stored in storage device is performed by calculation element, and in some cases, shown or described step can be performed with the order being different from herein, or they are fabricated to respectively each integrated circuit modules, or the multiple modules in them or step are fabricated to single integrated circuit module realize。So, the present invention is not restricted to the combination of any specific hardware and software。

The foregoing is only the preferred embodiments of the present invention, be not limited to the present invention, for a person skilled in the art, the present invention can have various modifications and variations。All within the spirit and principles in the present invention, any amendment of making, equivalent replacement, improvement etc., should be included within protection scope of the present invention。

Claims

1. a device-to-device D2D data transmission method, it is characterised in that including:

Determine for indicating D2D sender of communications user equipment (UE) that whether PDCP PDCP protocol Data Unit PDU carries out the PDCP head compression instruction information that PDCP head compression processes；And/or, for indicating D2D sender of communications user equipment (UE) that whether PDCP PDCP protocol Data Unit PDU carries out the PDCP encryption indication information of PDCP encryption；

Described PDCP head compression instruction information and/or described PDCP encryption indication information is sent to D2D communication receiver UE。

2. method according to claim 1, it is characterised in that in the following manner at least one, it is determined that described PDCP head compression instruction information and/or described PDCP encryption indication information:

Described PDCP head compression instruction information and/or described PDCP encryption indication information is determined according to D2D characteristics of communications traffic；

Described PDCP head compression instruction information and/or described PDCP encryption indication information is determined according to the configuration information that described D2D sender of communications UE own base station sends；

The configuration information that ProSe server belonging to described D2D sender of communications UE sends determines described PDCP head compression instruction information and/or described PDCP encryption indication information；

The configuration information that application server AS belonging to described D2D sender of communications UE sends determines described PDCP head compression instruction information and/or described PDCP encryption indication information。

3. method according to claim 1, it is characterized in that, by described PDCP head compression instruction information and/or described PDCP encryption indication information are carried the mode at PDCPPDU packet, send described PDCP head compression instruction information and/or described PDCP encryption indication information to D2D communication receiver UE。

4. method according to claim 3, it is characterized in that, by described PDCP head compression instruction information and/or described PDCP encryption indication information being carried the mode of the PDCP header part in described PDCPPDU packet, send described PDCP head compression instruction information and/or described PDCP encryption indication information to D2D communication receiver UE。

5. method according to claim 4, it is characterised in that the PDCP header part in described PDCPPDU packet also include following information at least one:

maxCID、profiles。

6. method according to claim 4, it is characterised in that include one below:

By described PDCP head compression instruction information and/or described PDCP encryption indication information are carried the mode in the PDU type field of the PDCP header part in described PDCPPDU packet, send described PDCP head compression instruction information and/or described PDCP encryption indication information to D2D communication receiver UE；

By described PDCP head compression instruction information and/or described PDCP encryption indication information are carried the mode in the safety information instructions field of the PDCP header part in described PDCPPDU packet, send described PDCP head compression instruction information and/or described PDCP encryption indication information to D2D communication receiver UE；

Carrying the mode in the head compression instructions field of the PDCP header part in described PDCPPDU packet and/or in encryption instructions field by described PDCP head being compressed instruction information and/or described PDCP encryption indication information, sending described PDCP head compression instruction information and/or described PDCP encryption indication information to D2D communication receiver UE。

7. a device-to-device D2D data transmission method, it is characterised in that including:

Receive for indicating D2D sender of communications user equipment (UE) that whether PDCP PDCP protocol Data Unit PDU carries out the PDCP head compression instruction information that PDCP head compression processes；And/or, for indicating D2D sender of communications user equipment (UE) that whether PDCP PDCP protocol Data Unit PDU carries out the PDCP encryption indication information of PDCP encryption；

Described PDCP head compression instruction information and/or described PDCP encryption indication information according to receiving carry out PDCP layer process。

8. method according to claim 7, it is characterised in that carry out the process of PDCP layer according to the described PDCP head compression instruction information received and/or described PDCP encryption indication information and include:

Compressing instruction information at described PDCP head indicates described D2D sender of communications UE that described PDCPPDU carried out the compression of PDCP head and/or when described PDCP encryption indication information indicates described D2D sender of communications UE that described PDCPPDU has been carried out PDCP encryption, and the PDCPPDU received carries out head decompression and/or decryption processing；

When described PDCPPDU has not been carried out the compression of PDCP head by the described PDCP head compression instruction information described D2D sender of communications UE of instruction and/or described PDCP encryption indication information indicates described D2D sender of communications UE described PDCPPDU not to be carried out PDCP encryption, abandon the PDCPPDU received is carried out head decompression and/or decryption processing。

9. method according to claim 7, it is characterized in that, by described PDCP head compression instruction information and/or described PDCP encryption indication information are carried the mode at PDCPPDU packet, receive described PDCP head compression instruction information and/or described PDCP encryption indication information。

10. method according to claim 9, it is characterized in that, by described PDCP head compression instruction information and/or described PDCP encryption indication information being carried the mode of the PDCP header part in described PDCPPDU packet, receive described PDCP head compression instruction information and/or described PDCP encryption indication information。

11. method according to claim 10, it is characterised in that the PDCP header part in described PDCPPDU packet also include following information at least one:

maxCID、profiles。

12. method according to claim 10, it is characterised in that include one below:

By described PDCP head compression instruction information and/or described PDCP encryption indication information are carried the mode in the PDU type field of the PDCP header part in described PDCPPDU packet, receive described PDCP head compression instruction information and/or described PDCP encryption indication information；

Carry in the PDU type field of the PDCP header part in described PDCPPDU packet by described PDCP head being compressed instruction information and/or described PDCP encryption indication information and/or encrypt the mode in instructions field, receiving described PDCP head compression instruction information and/or described PDCP encryption indication information。

13. method according to claim 12, it is characterised in that the PDU type field of described PDCP header part is for indicating the type of described PDCPPDU packet, and the value of described type includes at least one of:

Internet Protocol IP bag, ARP bag, use the IP bag of head compression, do not use the IP bag that head compresses。

14. a device-to-device D2D data transmission method, it is characterised in that including:

Determine the device-to-device D2D resource pool for abnormal conditions in cell system message；

D2D data transmission is carried out according to the described D2D resource pool determined。

15. method according to claim 14, it is characterised in that before carrying out D2D data transmission according to the described D2D resource pool determined, also include:

Detect that the D2D user equipment (UE) carrying out D2D data transmission is in the coverage of cellular cell。

16. method according to claim 15, it is characterized in that, the described D2DUE community being in the coverage of cellular cell residing for described D2DUE meets community and selects S criterion, or, described D2DUE determines that the community residing for described D2DUE is suitable community。

17. method according to claim 14, it is characterised in that after carrying out D2D data transmission according to the described D2D resource pool determined, also include:

Judge whether to receive the wireless spread-spectrum technology RRC reconfiguration message including D2D resource allocation information；

When judged result is for being, stop using the described D2D resource pool for abnormal conditions in system message。

18. a device-to-device D2D data transmission device, it is characterised in that including:

First determines module, for determining for indicating D2D sender of communications user equipment (UE) that whether PDCP PDCP protocol Data Unit PDU carries out the PDCP head compression instruction information that PDCP head compression processes；And/or, for indicating D2D sender of communications user equipment (UE) that whether PDCP PDCP protocol Data Unit PDU carries out the PDCP encryption indication information of PDCP encryption；

Sending module, for sending described PDCP head compression instruction information and/or described PDCP encryption indication information to D2D communication receiver UE。

19. device according to claim 18, it is characterised in that described first determines module, be additionally operable in the following manner at least one, it is determined that described PDCP head compression instruction information and/or described PDCP encryption indication information:

20. device according to claim 18, it is characterized in that, described sending module, it is additionally operable to, by described PDCP head compression instruction information and/or described PDCP encryption indication information are carried the mode at PDCPPDU packet, send described PDCP head compression instruction information and/or described PDCP encryption indication information to D2D communication receiver UE。

21. device according to claim 20, it is characterized in that, described sending module, being additionally operable to the mode by described PDCP head compression instruction information and/or described PDCP encryption indication information being carried the PDCP header part in described PDCPPDU packet, sending described PDCP head compression instruction information and/or described PDCP encryption indication information to D2D communication receiver UE。

22. device according to claim 21, it is characterised in that the PDCP header part in described PDCPPDU packet also include following information at least one:

maxCID、profiles。

23. device according to claim 21, it is characterised in that described sending module, it is additionally operable to one below:

24. device according to claim 23, it is characterised in that the PDU type field of described PDCP header part is for indicating the type of described PDCPPDU packet, and the value of described type includes at least one of:

25. a device-to-device D2D data transmission device, it is characterised in that including:

Receiver module, for receiving for indicating D2D sender of communications user equipment (UE) that whether PDCP PDCP protocol Data Unit PDU carries out the PDCP head compression instruction information that PDCP head compression processes；And/or, for indicating D2D sender of communications user equipment (UE) that whether PDCP PDCP protocol Data Unit PDU carries out the PDCP encryption indication information of PDCP encryption；

Processing module, for carrying out PDCP layer process according to the described PDCP head compression instruction information received and/or described PDCP encryption indication information。

26. device according to claim 25, it is characterised in that described processing module includes:

Processing unit, indicate described D2D sender of communications UE that described PDCPPDU carried out the compression of PDCP head and/or when described PDCP encryption indication information indicates described D2D sender of communications UE that described PDCPPDU has been carried out PDCP encryption for compressing instruction information at described PDCP head, the PDCPPDU received is carried out head decompression and/or decryption processing；

Abandon unit, for when described PDCPPDU has not been carried out the compression of PDCP head by the described PDCP head compression instruction information described D2D sender of communications UE of instruction and/or described PDCP encryption indication information indicates described D2D sender of communications UE described PDCPPDU not to be carried out PDCP encryption, abandoning the PDCPPDU received is carried out head decompression and/or decryption processing。

27. device according to claim 25, it is characterized in that, described receiver module, it is additionally operable to, by described PDCP head compression instruction information and/or described PDCP encryption indication information are carried the mode at PDCPPDU packet, receive described PDCP head compression instruction information and/or described PDCP encryption indication information。

28. device according to claim 27, it is characterized in that, described receiver module, being additionally operable to the mode by described PDCP head compression instruction information and/or described PDCP encryption indication information being carried the PDCP header part in described PDCPPDU packet, receiving described PDCP head compression instruction information and/or described PDCP encryption indication information。

29. device according to claim 28, it is characterised in that the PDCP header part in described PDCPPDU packet also include following information at least one:

maxCID、profiles。

30. device according to claim 28, it is characterised in that described receiver module, it is additionally operable to one below:

31. device according to claim 30, it is characterised in that the PDU type field of described PDCP header part is for indicating the type of described PDCPPDU packet, and the value of described type includes at least one of:

32. a device-to-device D2D data transmission device, it is characterised in that including:

Second determines module, for determining the device-to-device D2D resource pool for abnormal conditions in cell system message；

Transport module, for carrying out D2D data transmission according to the described D2D resource pool determined。

33. device according to claim 32, it is characterised in that also include:

Detection module, for detecting that the D2D subscriber equipment carrying out D2D data transmission is in the coverage of community。

34. device according to claim 32, it is characterized in that, the described D2DUE community being in the coverage of cellular cell residing for described D2DUE meets community and selects S criterion, or, described D2DUE determines that the community residing for described D2DUE is suitable community。

35. device according to claim 32, it is characterised in that also include:

Judge module, for judging whether to receive the wireless spread-spectrum technology RRC reconfiguration message including D2D resource allocation information；

Stopping modular, for when the judged result of described judge module is for being, stopping using the described D2D resource pool for abnormal conditions in system message。

36. a device-to-device D2D user equipment (UE), it is characterised in that include the device according to any one of claim 18 to 35。