CN104936226A - Data transmission method and system of equipment direct-communication system - Google Patents
Data transmission method and system of equipment direct-communication system Download PDFInfo
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Abstract
The invention discloses a data transmission method and system of an equipment direct-communication system. The data transmission method of the equipment direct-communication system includes: at least two pieces of Device to Device (D2D) User Equipment (UE) communicate based on a Media Access Control Protocol Data Unit (MAC PDU); wherein the MAC PDU contains a Media Access Control Control Element (MAC CE) for D2D communication addressing and an MAC subhead corresponding to the MAC CE for D2D communication addressing, or the MAC PDU adopts an MAC head of a new format which is located at the foremost end of the MAC PDU.
Description
Technical field
The present invention relates to device-to-device (D2D, Device to Device) data transmission technology, particularly relate to a kind of data transmission method and system of equipment direct communication system.
Background technology
At wireless communication field, along with the fast development of intelligent terminal and mobile Internet application, the requirement of people to Consumer's Experience and two-forty, big data quantity is more and more higher.Obvious limitation is there is in data that traditional with base station the is cellular network that transmits node center in the support of high data rate and adjacent service, under this requirement background, device-to-device (D2D, the Device toDevice) technology representing future communication technologies development new direction is arisen at the historic moment.The application of D2D technology, can alleviate the burden of cellular network, reduces the battery power consumption of subscriber equipment, improve 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 authorizes frequency range or unauthorized frequency range, allow the subscriber equipment of multiple support D2D function and D2D subscriber equipment (D2D UE, D2D User Equipment) when having network infrastructure or directly find/direct communication without when network infrastructure.The application scenarios of D2D mainly contains following three kinds:
UE1 and UE2 carries out data interaction under the covering of cellular network, user face data without network infrastructure, as the pattern 1 of Fig. 1;
Weak/without the UE relay transmission of overlay area, as the pattern 2 in Fig. 1, allow the poor UE4 of signal quality pass through near have the UE3 of the network coverage to communicate with network, operator can be helped to expand covering, raising capacity;
In generation earthquake or emergency, when cellular network cisco unity malfunction, allow equipment room direct communication, as the mode 3 in Fig. 1, between UE5, UE6 and UE7, the data communication of a jumping or multi-hop is all carried out in chain of command and user face without network infrastructure.
D2D technology generally includes D2D discovery technique and the D2D communication technology:
D2D discovery technique refers to and is mutually close to (such as can carry out within D2D direct communications range) or the technology for judging/determining first user proximity of devices second subscriber equipment for judging/determining between two or more D2D subscriber equipment.Usually, find that signal/information finds the other side by sending or receiving between D2D subscriber equipment, under having cellular network to cover, network can assist D2D subscriber equipment to carry out D2D discovery;
The D2D communication technology refers to that between D2D subscriber equipment, part or all of communication data directly can not carry out the technology communicated by network infrastructure.
In LTE transfer of data, medium education (MAC, Media Access Control) sublayer plays an important role to LTE system transfer of data and resource distribution.MAC layer is arranged in the data link layer of LTE system, and be the crucial sublayer ensureing connection setup, it is directly connected with physical layer downwards, and upwards direct and wireless spread-spectrum technology (RLC, Radio Link Control) layer connects.
Media access control protocol data unit (MAC PDU, Media Access Control ProtocolData Unit) is with the Bit String of byte-aligned (i.e. the multiple of 8bit) in length.MAC PDU comprises a MAC head, 0 or multiple medium education Service Data Unit (MAC SDU, Media AccessControl Service Data Unit), 0 or multiple medium education control unit (MAC CE, MediaAccess Control Control Element), and possible filling (padding), as shown in Figure 2.The MAC head of MAC PDU comprises one or more MAC PDU head, and every height head corresponds to a MAC SDU, or MAC CE, or fills.
D2D communication comprises clean culture, multicast and broadcast communication, usually carries source address, to make the clear source knowing data of recipient in data transmission procedure.In unicast communication, destination address is required, and receiving UE so just can according to carrying out the destination address in data verifying coupling to judge whether the data received issue self; When multicast, also need the group address of explicit data object, verification can be carried out according to self place group mark receive to receive UE; And for broadcast communication, although destination address can be optional, data are all receivable for all legal D2D UE, broadcast identification address also can be used to be distinguished for distinguishing over clean culture, multicast.In D2D communication process, the packets need transmitted is processed by MAC layer, current 3GPP meeting has been reached at MAC layer carrying layer 2 object ID, can filter out the packet of non-self UE reception like this at MAC.Current LTE MAC PDU form can not be directly applied for D2D communication, but also not yet has definition to be applicable to the MAC PDU format approach of D2D communication.
Summary of the invention
For solving the problems of the technologies described above, the embodiment of the present invention provides a kind of data transmission method and system of equipment direct communication system, by providing the MAC being suitable for transfer of data PDU, meets the data communication between D2D UE.
The technical scheme of the embodiment of the present invention is achieved in that
A data transmission method for equipment direct communication system, comprising:
Communicate based on media access control protocol data unit MAC PDU between at least two device-to-device D2D user equipment (UE)s;
Wherein, described MAC PDU comprises the medium education control unit MACCE of D2D communication addressing, and corresponds to the MAC head of described D2D communication addressing MAC CE; Or,
Described MAC PDU adopts the MAC head of format, and the MAC head of described format is positioned at MACPDU foremost.
A data transmission system for equipment direct communication system, described system comprises at least two device-to-device D2D user equipment (UE)s; Wherein, communicate based on media access control protocol data unit MAC PDU between described at least two D2D UE;
Wherein, described MAC PDU comprises the medium education control unit MACCE of D2D communication addressing, and corresponds to the MAC head of described D2D communication addressing MAC CE; Or,
Described MAC PDU adopts the MAC head of format, and the MAC head of described format is positioned at MACPDU foremost.
In the embodiment of the present invention, by providing a kind of MACPDU for transfer of data between D2D UE, to realize transfer of data between D2D UE; Wherein, described MAC PDU comprises the medium education control unit MAC CE of D2D communication addressing, and correspond to the MAC head of described D2D communication addressing MAC CE, or described MAC PDU adopts the MAC head of format, and the MAC head of described format is positioned at MAC PDU foremost.Embodiments provide the MAC PDU being suitable for transfer of data, meet the data communication between D2D UE.
Accompanying drawing explanation
Fig. 1 is the application scenarios figure of D2D;
Fig. 2 is LTE MAC PDU format structure schematic diagram;
Fig. 3 is the MAC header structure schematic diagram of LTE MAC PDU;
Fig. 4 is the structural representation that in the D2D communication of the embodiment of the present invention, MAC CE comprises layer 2 source and destination ID respectively;
Fig. 5 is the structural representation that in the D2D communication of the embodiment of the present invention, MAC CE comprises layer 2 source and destination two ID simultaneously;
Fig. 6 is the D2D communication MAC PDU structure example schematic diagram only comprising the data of a transmission communication objective address of D2D of the embodiment of the present invention;
Fig. 7 is the D2D communication MAC PDU structure example schematic diagram comprising the data of transmission two communication objective addresses of D2D of the embodiment of the present invention;
Fig. 8 is the sub-head comprising the communication objective address of given D2D of the embodiment of the present invention and the MAC header structure schematic diagram of size of data;
Fig. 9 is the structural representation comprising the data MAC head of a transmission communication objective address of D2D of the embodiment of the present invention;
Figure 10 is the structural representation comprising the data MAC head (only comprising sub-head length) sending the communication objective address of multiple D2D of the embodiment of the present invention;
Figure 11 is the structural representation comprising the data MAC head (comprising sub-head and CE/ data length) sending the communication objective address of multiple D2D of the embodiment of the present invention.
Embodiment
For making the object, technical solutions and advantages of the present invention clearly understand, by the following examples also with reference to accompanying drawing, the present invention is described in more detail.
In LTE communication system, MAC PDU is with the Bit String of byte-aligned (i.e. the multiple of 8bit) in length.MAC PDU comprises a MAC head, 0 or multiple MAC SDU, 0 or multiple MACCE, and possible filling, as shown in Figure 2.The MAC head of MAC PDU comprises the sub-head of one or more MACPDU, and every height head corresponds to a MAC SDU, or MAC CE, or fills.MAC PDU head form as shown in Figure 3, comprises 6 field: R/R/E/LCID/F/L usually.But for last height head of MAC PDU or the MAC CE for fixed size, MAC head only comprises 4 field: R/R/E/LCID.In addition corresponding with filling MAC PDU head is also comprise four field: R/R/E/LCID.Appearance order and the MAC SDU below of MAC PDU head, the order one_to_one corresponding of MAC CE and filling.
More defined MAC CE being applicable to needed for LTE communication in current LTE36.321.Be filled in and need the byte number of filling when being greater than two, usually appear at the end of MAC PDU; And when the byte needing to fill is one or two, corresponding filling is placed on the beginning of whole MAC PDU.
Logic Channel Identifier (LCID, the Logical Channel ID) field occurred in MAC head is used to indicate the logic channel example of corresponding MAC SDU, or the type of MAC CE, or fills, specifically as shown in Table 1 and Table 2:
| Index (Index) | LCID value (values) |
| 00000 | CCCH |
| 00001-01010 | Identity of the logical channel |
| 01011-11010 | Reserved |
| 11011 | Activation/Deactivation |
| 11100 | UE Contention Resolution Identity |
| 11101 | Timing Advance Command |
| 11110 | DRX Comman |
| 11111 | Padding |
Table 1
| Index (Index) | LCID value (values) |
| 00000 | CCCH |
| 00001-01010 | Identity of the logical channel |
| 01011-11000 | Reserved |
| 11001 | Extended Power Headroom Report |
| 11010 | Power Headroom Report |
| 11011 | C-RNTI |
| 11100 | Truncated BSR |
| 11101 | Short BSR |
| 11110 | Long BSR |
| 11111 | Padding |
Table 2
As shown in table 1, table 2, the L in MAC head is used to indicate the byte number of the length of MAC SDU or the MAC CE of variable-length.The size of L field is indicated by F field.Whether the E field instruction in MAC head also has more field in MAC head.If also have at least another group R/R/E/LCID field, then E is set to " 1 "; If E is set to " 0 ", represent from byte thereafter to be MAC SDU or MAC CE or filling.R is reserved field, is set to " 0 ".
The embodiment of the present invention describes a kind of data transmission system of equipment direct communication system, and described system comprises at least two device-to-device D2D user equipment (UE)s; Wherein, communicate based on media access control protocol data unit MAC PDU between described at least two D2D UE; Wherein, described MAC PDU comprises the medium education control unit MAC CE of D2D communication addressing, and corresponds to the MAC head of described D2D communication addressing MAC CE.
Preferably, described D2D communication addressing MAC CE comprises MAC CE, D2D communication objective address, D2D communication source address MAC CE; Or,
Described D2D communication addressing MAC CE comprises D2D communication source address information; Or,
Described D2D communication addressing MAC CE comprises D2D communication objective address information; Or,
Described D2D communication addressing MAC CE comprises D2D communication source address information and D2D communication source address information.
Preferably, described D2D communication source address is identified by the transmit leg UE communicated;
The communication objective address of described D2D is identified by the recipient UE communicated, and the communication objective address of described D2D comprises unicast reception side UE and identifies, or the communication set mark that multicast reception side is corresponding, or the broadcast identification that broadcast is corresponding.
Preferably, described D2D communication addressing MAC CE is carried on described MAC PDU foremost.
Preferably, the sub-head comprising the MAC CE of instruction D2D communication source address is positioned at first sub-head of MAC PDU;
Or when there is the filling sub-head of a byte and two bytes, the sub-head comprising the MAC CE of instruction D2D communication source address is positioned at first sub-head after the filling sub-head of MAC PDU.
Preferably, the Logic Channel Identifier LCID field comprised corresponding to the MAC head of D2D communication addressing MAC CE adopts preallocated index value to be used to indicate described D2D communication addressing MAC CE.
Preferably, when comprising the data for the communication objective address of multiple D2D in a MAC PDU, MAC CE comprises D2D communication source address only once simultaneously;
Multiple D2D UE communication is:
Unicast communication between source D2D UE and multiple object D2D UE; And/or,
Source D2D UE is to the cast communication between multiple D2D communication set; And/or,
Multiple broadcast communications that source D2D UE sends.
Preferably, when comprising the data for the communication objective address of multiple D2D in a MAC PDU simultaneously, for the communication objective address of each D2D, comprise the corresponding communication objective address MACCE of D2D in MAC PDU, and this MAC CE appears at the first place corresponding to this D2D communication objective address communication data;
Preferably, in the MAC PDU head for the data of the communication objective address of multiple D2D, comprise first that sub-head that corresponding D2D communication objective address MAC CE indicates appears at corresponding to MAC head corresponding to the communication objective address of this D2D;
Preferably, when comprising the data for the communication objective address of multiple D2D in a MAC PDU, indicate whether for last D2D communication objective address mode by increasing M field in the MAC head that D2D communication addressing MAC CE is corresponding simultaneously.
Preferably, when the instruction of M field is not last D2D communication objective address, the byte number that MAC head corresponding to the communication objective address of this D2D takies also is comprised in the MAC head that D2D communication addressing MAC CE is corresponding, and the byte number of the CE/ data relevant to the communication objective address of this D2D.
Preferably, when D2D communication is for broadcast communication, in the MAC head of the instruction corresponding MAC CE in D2D communication source address, use the LCID being specifically designed to instruction broadcast communication; Or use a certain bit in the reserved bit in the MAC head of D2D communication source address MACCE to be set to represent that current D2D communication is broadcast communication;
When D2D communication is for non-broadcast, in the MAC head of the instruction corresponding MAC CE in D2D communication source address, use the LCID being specifically designed to instruction non-broadcast; Or use a certain bit in the reserved bit in the MAC head of D2D communication source address MAC CE to be set to represent that current D2D communication is non-broadcast;
Wherein, being set in the reserved bit in the MAC head of D2D communication source address MAC CE represents that current D2D communicates as a certain bit of non-broadcast and broadcast communication is same bit.
Preferably, during broadcast communication, to the MAC CE comprising D2D communication source address and the communication objective address of D2D simultaneously, in MAC CE, do not carry D2D communication objective address field; Or in MAC PDU, do not take the MAC CE of D2D communication objective address MAC head and correspondence.
Preferably, described MAC PDU adopts the MAC head of format, and the MAC head of described format is positioned at MAC PDU foremost.
Preferably, the MAC head of described format carries D2D communication source address and the communication objective address of D2D, does not carry the MAC CE of MAC head and correspondence, does not comprise the field of LCID.
Preferably, when comprising the data of multiple destination node in described MAC PDU, increase whether field E mark is follow-up also has broadcast/group broadcast/unicast info indication information.
Preferably, the instruction of described E field is follow-up when having broadcast/group broadcast/unicast info, increases the field of length information byte number corresponding to the communication objective address of this D2D before or after the information of D2D communication objective address.
Preferably, the instruction of described E field is follow-up when also having broadcast/group broadcast/unicast info, increase again after the field of described length information byte number the communication objective address of this D2D the field of the byte number of CE/ data of being correlated with.
Below in conjunction with concrete example, illustrate the essence of technical solution of the present invention further.
Embodiment one
What the present embodiment mainly described is the format mode that the independent MAC CE of use two distinguishes marker 2 source ID and layer 2 object ID.
As shown in Figure 4, be the example of the format mode of use two independent MAC CE difference marker 2 source ID and layer 2 object ID, illustrate and be described below:
The MAC PDU of D2D communication adopts based on LTE MAC PDU form, and the frame mode be consistent, is specially: D2D communication MAC PDU is with the Bit String of byte-aligned (i.e. the multiple of 8bit) in length; MAC PDU comprises a MAC head, 0 or multiple MAC SDU, 0 or multiple MACCE, and possible filling.The variable-length of MAC head and MAC SDUs.The MAC head of MAC PDU comprises one or more MAC PDU head, and every height head corresponds to a MAC SDU, or MACCE, or fills.
D2D communication MAC PDU head comprises 6 field: R/R/E/LCID/F/L usually.But for last height head of MAC PDU or the MAC CE for fixed size, MAC head only comprises 4 field: R/R/E/LCID.In addition corresponding with filling MAC PDU head is also comprise four field: R/R/E/LCID.Appearance order and the MAC SDU below of MAC PDU head, the order one_to_one corresponding of MAC CE and filling.
When needing the byte number of filling to be greater than two, fill the end usually appearing at MAC PDU.Filling can comprise arbitrary value, and UE can directly ignore.When filling appear at MAC PDU last time, 0 or multiple byte of padding can be allowed.When the filling of needs byte or two bytes, one or two corresponds to the beginning that the MAC PDU head of filling is placed on whole MAC PDU, before other MAC PDU heads arbitrarily.
The content format of the CE of MAC shown in Fig. 4 is use two fixed sizes and independently MAC CE is used to indicate layer 2 source ID and layer 2 object ID, and its middle level 2 source ID and layer 2 object ID adopts 16 bit-wise to represent; The LCID being used to indicate D2D communication MAC CE adopts the LCID by LTE MAC PDU is reserved to select two, from table 1 and table 2, reserved LCID identification number is 01011-11000, and the MAC CE that 11000 are used to indicate layer 2 object ID as chosen, is used to indicate the MAC CE of layer 2 source ID by 10111.Or as table 3 mode, LCID value special in MAC head be designed to determine that MACCE type is that D2D UE identifies, D2D broadcasts, D2D multicast/clean culture.To the corresponding MAC CE be made up of L2 source ID of MAC head instruction that D2D UE identifies.The corresponding MAC CE be made up of L2 Target id is indicated to the MAC head of D2D broadcast and D2D multicast/clean culture.In addition, be indicate reception UE to be that follow-up RLC PDU receives because D2D broadcasts sub-head, the MAC CE that corresponding D2D broadcasts sub-head can be made up of 0 bit.
| Index | LCID values |
| 00000 | Reserved |
| 00001-01010 | Identity of the logical channel |
| 01011-11011 | Reserved |
| 11100 | D2D UE Identity |
| 11101 | D2D broadcast |
| 11110 | D2D groupcast/unicast |
| 11111 | Padding |
Table 3
When D2D communication data receives, D2D UE can know the MAC CE of layer 2 source ID and layer 2 object ID respectively by the sub-head of D2D communication MAC PDU, thus securing layer 2 source ID and layer 2 object ID, by verifying 2 object ID of the layer obtained, can know whether received D2D communication data is self need to receive.
Embodiment two
The format mode of the independent MAC CE of use one that what the present embodiment mainly described is marker 2 source ID and layer 2 object ID simultaneously.
As shown in Figure 5, be the example of the independent MAC CE of use one format mode of marker 2 source ID and layer 2 object ID simultaneously, illustrate and be described below:
The MAC PDU of D2D communication adopts based on LTE MAC PDU form, and the frame mode be consistent, illustrates see embodiment one.
Figure 5 shows that the content format of MAC CE, only use a fixed size and independently MAC CE is used for simultaneously that marker 2 source ID and layer 2 object ID, its middle level 2 source ID and layer 2 object ID adopt 16 bit-wise to represent; The LCID being used to indicate D2D communication MAC CE adopts the LCID from LTE MAC PDU is reserved to select one, from table 1 and table 2, reserved LCID identification number is 01011-11000, as can choose 11000 for while marker 2 source ID and layer 2 object ID MAC CE.
Embodiment three
The example example of D2D communication MAC PDU form when what the present embodiment mainly described is the data only comprising a transmission communication objective address of D2D.
The example example of D2D communication MACPDU form when being the data only comprising a transmission communication objective address of D2D as shown in Figure 6, illustrates and is described below:
The MAC CE of layer 2 source ID and layer 2 object ID should be placed on starting most of MAC PDU as far as possible, to allow the filtration that reception UE can be fast as far as possible receive interested MAC PDU, according to example one, the sub-head that the MAC CE of layer 2 source ID and layer 2 object ID is corresponding be also be placed on as far as possible MAC chieftain's head before;
Shown in the left figure of Fig. 6 be when only comprising D2D communication set data, use two independent MAC CE marker 2 source ID and layer 2 object ID respectively, the MAC CE of layer 2 source ID and layer 2 object ID should be placed on starting most of MAC PDU as far as possible, during as filling to a non-byte or two bytes, MAC CE corresponding to layer 2 source ID to be placed on after MAC head first, the MAC CE that only then placed layer 2 object ID is corresponding, namely to a non-byte or the filling of two bytes, the sub-head of the MAC PDU head first MAC CE of placed layer 2 source ID, and then the MAC CE head of placed layer 2 object ID, the MAC CE of first placed layer 2 source ID after sub-head terminates, and then the MAC CE of placed layer 2 object ID, place possible MAC SDU and/or filling below again.
Shown in the right figure of Fig. 6 is when only comprising D2D communication set data, use independent MACCE marker 2 source ID and layer 2 object ID respectively, the MAC CE of layer 2 source ID and layer 2 object ID should be placed on starting most of MAC PDU as far as possible, during as filling to a non-byte or two bytes, layer 2 source ID and the MAC CE corresponding to layer 2 object ID to be placed on after MAC head first, namely to a non-byte or the filling of two bytes, the sub-head of the MAC PDU head first MAC CE of placed layer 2 source ID and layer 2 object ID, after sub-head terminates, the MAC CE of placed layer 2 source ID and layer 2 object ID, place possible MAC SDU and/or filling below again.
Embodiment four
The example example of D2D communication MAC PDU form when what the present embodiment mainly described is the data comprising transmission two and the communication objective address of above D2D.
As shown in Figure 7, the example example of D2D communication MAC PDU form when being the data comprising transmission two communication objective addresses of different D2D, illustrates and is described below:
If D2D UE assembling simultaneously can comprise the data issuing the communication objective address of multiple D2D in a MAC PDU, for sake of convenience, the communication of issuing the communication objective address of a certain D2D is called a certain D2D communication set.The D2D communication MAC PDU form assembling mode issuing the data acquisition of multiple D2D communication set is: for the MAC CE comprising source ID, only comprise once, and the sub-head corresponding to it be MAC PDU first sub-head (except a byte and two bytes filling sub-head except).For the MAC CE comprising object ID, can according to the number of the multiplexing D2D communication set an assembling, for each D2D communication set, there is the MAC CE once comprising corresponding object ID, this MAC CE appears at first sub-head corresponding to these D2D communication set data at every turn, be only the MAC SDU that it is possible below, and other possible MAC CE and MAC SDU, and possible filling.
Figure 7 shows that D2D UE assembling simultaneously in a MAC PDU comprises and send the data of the communication objective address of multiple D2D: during filling to a non-byte or two bytes, the MAC CE of layer corresponding to 2 source ID to be placed on after MAC head first, the immediately MAC CE of placed layer 2 object ID1 and corresponding possible MAC SDU, and other possible MAC CE and MAC SDU, and then at MAC CE and the corresponding possible MAC SDU of placed layer 2 object ID2, and other possible MAC CE and MAC SDU, finally place possible filling.When receiving, receiving UE separates parsing MAC PDU respectively sub-head and MAC CE according to order, obtaining corresponding information data.
Embodiment five
D2D UE assembling simultaneously in a MAC PDU that what the present embodiment mainly described is comprises the MAC head form during data sending the communication objective address of multiple D2D.
As shown in Figure 8, be to D2D UE assembling simultaneously in a MAC PDU comprise send the data of multiple D2D communication objective address time MAC head form example, illustrate and be described below:
For convenience of description, the communication of issuing the communication objective address of a certain D2D is called a certain D2D communication set.
In embodiment four, for the UE only receiving second D2D communication set data, must travel through the data that the MAC head corresponding to first D2D communication set could start to receive second D2D communication set, treatment effeciency is not high enough.Whether be indication field M and the field Lsubheader of byte number that MAC head take of last group and the field Ldata of the byte number of to this communication set relevant CE/ data, thus can accelerate to locate the sub-head of next D2D communication set and Data Position if can increase in MAC head.
In MAC head, when to D2D UE, in a MAC PDU, assembling comprises the data of multiple D2D communication set simultaneously, as shown in Figure 8, increase field M and indicate whether it is last group, if not, then in sub-head, increase the field Ldata of the field Lsubheader that MAC head that instruction belongs to these group data takies byte number and the byte number taken with this communication set related data further.If namely field M instruction is not last group, to continue thereafter the byte number Ldata of byte number Lsubheader that the MAC head of filling bag containing this communication set corresponding CE/ data take and CE/ data corresponding to this communication set.Like this, receive D2D UE when receiving data, when being resolved to present communications group, if discovery is not the communication set (being not the communication data issuing self) interested to self, and when finding to also have another one group, the byte number Lsubheader that the MAC head that D2D UE directly can skip the corresponding CE/ data of this communication set on MAC head takies, concrete data can be skipped when locating the byte number Ldata of the corresponding CE/ data of communication set, thus quick position carries out resolving and obtains self information needed to next D2D communication set.
Embodiment six
What the present embodiment mainly described is that the LCID using the MAC head of the corresponding MAC CE of layer 2 source ID to use distinguishes use broadcast or non-broadcasting, illustrates and is described below:
In the aforementioned embodiment, the D2D communication carried out may be clean culture, multicast and broadcast, and for broadcast communication, all legal D2D UE need to receive, therefore can without carrying layer 2 object id field in MAC CE.
In MAC PDU, the MAC CE corresponding to specifying by MAC CE head LCID is layer 2 source ID or layer 2 object ID, as supposed the 11000 MAC CE being used to indicate layer 2 object ID, and the 10111 MAC CE being used to indicate layer 2 source ID.
To the broadcast communication in D2D, can the MAC CE of removed layers 2 object ID, the MAC CE corresponding to specifying in combination with LCID is layer 2 source ID or layer 2 object ID, saves the MAC head of layer 2 object ID and the MAC CE byte number of correspondence;
Or to the MAC CE comprising layer 2 source ID and layer 2 object ID simultaneously, not carrying layer 2 object id field in MAC CE, the MAC CE corresponding to specifying in combination with LCID is layer 2 source ID or layer 2 object id information, saves the MAC CE byte number of layer 2 object ID.
Embodiment seven
What the present embodiment mainly described is use the reserved bit in MAC head to indicate for broadcast or non-broadcasting, illustrates and is described below:
For the D2D communication carried out in embodiment one to embodiment five, may be clean culture, multicast and broadcast, communicate with multicast D2D for clean culture, layer 2 object ID be essential, judges whether it is self interested D2D communication data for D2D UE; And if D2D broadcast communication, then all D2D UE need to receive, therefore without the need for special layer 2 object ID, as long as by other message identifications.Namely the present embodiment is adopt a bit in the reserved bit in MAC head to indicate for broadcast or non-broadcasting:
When carrying out the broadcast communication of D2D communication, in reserved bit in MAC head an one bit R is set to 1 and is expressed as broadcast, simultaneously can adopt method described in embodiment six, can not carrying layer 2 object id field or do not carry the MAC head of marker 2 object ID and the MAC CE of correspondence in MAC PDU in MAC CE;
When carrying out cast communication or the unicast communication of D2D communication, the bit R of in the reserved bit in MAC head being set to 0 and being expressed as non-broadcasting.
Embodiment eight
When what the present embodiment mainly described is the data comprising a transmission communication objective address of D2D, D2D communication MAC PDU adopts the mode of format MAC head.
When being the data comprising a transmission communication objective address of D2D as shown in Figure 9, D2D communication MACPDU adopts the process example of the mode of format MAC head, illustrates and is described below:
D2D communication MAC PDU increases the MAC head of a format in forefront, it carries source and destination indication information as shown in figure 11.
In MAC head, only include layer 2 source ID and layer 2 object id information.MAC header modes of emplacement is: layer 2 source ID is placed on MAC head forward part, after immediately placed layer 2 object ID; MAC CE information by MAC head and correspondence is all removed, that is no longer needs LCID.
Embodiment nine
What the present embodiment mainly described is when comprising the data sending the communication objective address of multiple D2D, and D2D communication MAC PDU adopts the mode of format MAC head.
Be when comprising the data sending the communication objective address of multiple D2D as shown in Figure 10, D2D communication MACPDU adopts the process example of the mode of format MAC head, illustrates and is described below:
When comprising the data of the destination node that multiple needs send in D2D communication MAC PDU, D2D communication MAC PDU increases the MAC head of a format in forefront.
First the MAC head of format is placed layer 2 source id information; Thereafter place again and represent the follow-up indication information E whether having broadcast/group broadcast/unicast info, as when E is set as 1, represent follow-up and also have broadcast/group broadcast/unicast info, E is set to 0, and representing follow-up does not have broadcast/group broadcast/unicast info; Thereafter immediately placing the sub-header Lsubheader representing broadcast/group broadcast/unicast info, it represents the length of the sub-header of broadcast/group broadcast/clean culture; Placed layer 2 object id information again after these information; Also information field E, sub-header Lsubheader field and layer 2 object id information mode place corresponding information as indicated below.
Embodiment ten
Send data that UE once comprises the communication objective address of multiple D2D in D2D communication that what the present embodiment mainly described is when sending, the D2D MAC PDU that communicates adopts the another kind of mode of new MAC head form.
As shown in figure 11, be when comprising the data sending the communication objective address of multiple D2D in D2D communication, D2D communication MAC PDU adopts the process example of the another kind of mode of new MAC head form, illustrates and is described below:
When comprising the data of the destination node that multiple needs send in D2D communication MAC PDU, D2D communication MAC PDU increases the MAC head of a format in forefront.
First the MAC head of format is placed layer 2 source id information; Thereafter place again and represent the follow-up indication information E whether having broadcast/group broadcast/unicast info, as when E is set as 1, represent follow-up and also have broadcast/group broadcast/unicast info, E is set to 0, and representing follow-up does not have broadcast/group broadcast/unicast info; Place the sub-header Lsubheader field representing broadcast/group broadcast/unicast info immediately preceding indication information E field, it represents the length of the sub-header of broadcast/group broadcast/clean culture, and is placing expression data length information Ldata field thereafter; Placed layer 2 object id information again after these information; Also information field E, sub-header Lsubheader field, data length information Ldata field and layer 2 object id information mode place corresponding information as indicated below.
The foregoing is only embodiments of the invention, be not limited to the present invention, for a person skilled in the art, the present invention can have various modifications and variations.Within the spirit and principles in the present invention all, any amendment done, equivalent replacement, improvement etc., all should be included within right of the present invention.
The all or part of step that one of ordinary skill in the art will appreciate that in said method is carried out instruction related hardware by program and is completed, and described program can be stored in computer-readable recording medium, as read-only memory, disk or CD etc.Alternatively, all or part of step of above-described embodiment also can use one or more integrated circuit to realize.Correspondingly, each module/unit in above-described embodiment can adopt the form of hardware to realize, and the form of software function module also can be adopted to realize.The present invention is not restricted to the combination of the hardware and software of any particular form.
Claims (34)
1. a data transmission method for equipment direct communication system, is characterized in that, described method comprises:
Communicate based on media access control protocol data unit MAC PDU between at least two device-to-device D2D user equipment (UE)s;
Wherein, described MAC PDU comprises the medium education control unit MACCE of D2D communication addressing, and corresponds to the MAC head of described D2D communication addressing MAC CE; Or,
Described MAC PDU adopts the MAC head of format, and the MAC head of described format is positioned at MACPDU foremost.
2. method according to claim 1, is characterized in that, described D2D communication addressing MAC CE comprises MAC CE, D2D communication objective address, D2D communication source address MAC CE; Or,
Described D2D communication addressing MAC CE comprises D2D communication source address information; Or,
Described D2D communication addressing MAC CE comprises D2D communication objective address information; Or,
Described D2D communication addressing MAC CE comprises D2D communication source address information and D2D communication source address information.
3. method according to claim 2, is characterized in that, described D2D communication source address is identified by the transmit leg UE communicated;
The communication objective address of described D2D is identified by the recipient UE communicated, and the communication objective address of described D2D comprises unicast reception side UE and identifies, or the communication set mark that multicast reception side is corresponding, or the broadcast identification that broadcast is corresponding.
4. method according to claim 1, is characterized in that, described D2D communication addressing MAC CE is carried on described MAC PDU foremost.
5. method according to claim 1, is characterized in that, described method also comprises:
The sub-head comprising the MAC CE of instruction D2D communication source address is positioned at first sub-head of MAC PDU;
Or when there is the filling sub-head of a byte and two bytes, the sub-head comprising the MAC CE of instruction D2D communication source address is positioned at first sub-head after MAC PDU filling sub-head.
6. method according to claim 1 or 5, it is characterized in that, described method also comprises:
The Logic Channel Identifier LCID field comprised corresponding to the MAC head of D2D communication addressing MAC CE adopts preallocated index value to be used to indicate described D2D communication addressing MAC CE.
7. method according to claim 2, is characterized in that, described method also comprises:
When comprising the data for the communication objective address of multiple D2D in a MAC PDU, MACCE comprises D2D communication source address only once simultaneously;
Multiple D2D UE communication is:
Unicast communication between source D2D UE and multiple object D2D UE; And/or,
Source D2D UE is to the cast communication between multiple D2D communication set; And/or,
Multiple broadcast communications that source D2D UE sends.
8. method according to claim 2, is characterized in that, described method also comprises:
When comprising the data for the communication objective address of multiple D2D in a MAC PDU simultaneously, for the communication objective address of each D2D, comprise corresponding D2D communication objective address MAC CE in MAC PDU, and this MAC CE appears at the first place corresponding to this D2D communication objective address communication data.
9. method according to claim 2, is characterized in that, described method also comprises:
In MAC PDU head for the data of the communication objective address of multiple D2D, comprise first that sub-head that corresponding D2D communication objective address MAC CE indicates appears at corresponding to MAC head corresponding to the communication objective address of this D2D.
10. method according to claim 2, is characterized in that, described method also comprises:
When comprising the data for the communication objective address of multiple D2D in a MAC PDU, indicate whether for last D2D communication objective address mode by increasing M field in the MAC head that D2D communication addressing MAC CE is corresponding simultaneously.
11. methods according to claim 10, is characterized in that, described method also comprises:
When the instruction of M field is not last D2D communication objective address, the byte number that MAC head corresponding to the communication objective address of this D2D takies also is comprised in the MAC head that D2D communication addressing MAC CE is corresponding, and the byte number of the CE/ data relevant to the communication objective address of this D2D.
12. methods according to claim 2, is characterized in that, described method also comprises:
When D2D communication is for broadcast communication, in the MAC head of the instruction corresponding MAC CE in D2D communication source address, use the LCID being specifically designed to instruction broadcast communication; Or use a certain bit in the reserved bit in the MAC head of D2D communication source address MAC CE to be set to represent that current D2D communication is broadcast communication;
When D2D communication is for non-broadcast, in the MAC head of the instruction corresponding MAC CE in D2D communication source address, use the LCID being specifically designed to instruction non-broadcast; Or use a certain bit in the reserved bit in the MAC head of D2D communication source address MAC CE to be set to represent that current D2D communication is non-broadcast;
Wherein, being set in the reserved bit in the MAC head of D2D communication source address MAC CE represents that current D2D communicates as a certain bit of non-broadcast and broadcast communication is same bit.
13. methods according to claim 2, is characterized in that, described method also comprises:
During broadcast communication, to the MACCE comprising D2D communication source address and the communication objective address of D2D simultaneously, in MAC CE, do not carry D2D communication objective address field; Or in MAC PDU, do not take the MAC CE of D2D communication objective address MAC head and correspondence.
14. methods according to claim 1, is characterized in that, the MAC head of described format carries D2D communication source address and the communication objective address of D2D, does not carry the MAC CE of MAC head and correspondence, does not comprise the field of LCID.
15. methods according to claim 14, is characterized in that, described method also comprises:
When comprising the data of multiple destination node in described MAC PDU, increase whether field E mark is follow-up also has broadcast/group broadcast/unicast info indication information.
16. methods according to claim 15, is characterized in that, the instruction of described E field is follow-up when having broadcast/group broadcast/unicast info, increases the field of length information byte number corresponding to the communication objective address of this D2D before or after the information of D2D communication objective address.
17. methods according to claim 16, it is characterized in that, the instruction of described E field is follow-up when also having broadcast/group broadcast/unicast info, increase again after the field of described length information byte number the communication objective address of this D2D the field of the byte number of CE/ data of being correlated with.
The data transmission system of 18. 1 kinds of equipment direct communication systems, is characterized in that, described system comprises at least two device-to-device D2D user equipment (UE)s; Wherein, communicate based on media access control protocol data unit MAC PDU between described at least two D2D UE;
Wherein, described MAC PDU comprises the medium education control unit MACCE of D2D communication addressing, and corresponds to the MAC head of described D2D communication addressing MAC CE; Or,
Described MAC PDU adopts the MAC head of format, and the MAC head of described format is positioned at MACPDU foremost.
19. systems according to claim 18, is characterized in that, described D2D communication addressing MACCE comprises MAC CE, D2D communication objective address, D2D communication source address MAC CE; Or,
Described D2D communication addressing MAC CE comprises D2D communication source address information; Or,
Described D2D communication addressing MAC CE comprises D2D communication objective address information; Or,
Described D2D communication addressing MAC CE comprises D2D communication source address information and D2D communication source address information.
20. systems according to claim 19, is characterized in that, described D2D communication source address is identified by the transmit leg UE communicated;
The communication objective address of described D2D is identified by the recipient UE communicated, and the communication objective address of described D2D comprises unicast reception side UE and identifies, or the communication set mark that multicast reception side is corresponding, or the broadcast identification that broadcast is corresponding.
21. systems according to claim 18, is characterized in that, described D2D communication addressing MACCE is carried on described MAC PDU foremost.
22. systems according to claim 18, is characterized in that:
The sub-head comprising the MAC CE of instruction D2D communication source address is positioned at first sub-head of MAC PDU;
Or when there is the filling sub-head of a byte and two bytes, the sub-head comprising the MAC CE of instruction D2D communication source address is positioned at first sub-head after the filling sub-head of MAC PDU.
23. systems according to claim 18 or 22, is characterized in that:
The Logic Channel Identifier LCID field comprised corresponding to the MAC head of D2D communication addressing MAC CE adopts preallocated index value to be used to indicate described D2D communication addressing MAC CE.
24. systems according to claim 19, is characterized in that:
When comprising the data for the communication objective address of multiple D2D in a MAC PDU, MACCE comprises D2D communication source address only once simultaneously;
Multiple D2D UE communication is:
Unicast communication between source D2D UE and multiple object D2D UE; And/or,
Source D2D UE is to the cast communication between multiple D2D communication set; And/or,
Multiple broadcast communications that source D2D UE sends.
25. systems according to claim 19, is characterized in that:
When comprising the data for the communication objective address of multiple D2D in a MAC PDU simultaneously, for the communication objective address of each D2D, comprise corresponding D2D communication objective address MAC CE in MAC PDU, and this MAC CE appears at the first place corresponding to this D2D communication objective address communication data.
26. systems according to claim 19, is characterized in that:
In MAC PDU head for the data of the communication objective address of multiple D2D, comprise first that sub-head that corresponding D2D communication objective address MAC CE indicates appears at corresponding to MAC head corresponding to the communication objective address of this D2D.
27. systems according to claim 19, is characterized in that:
When comprising the data for the communication objective address of multiple D2D in a MAC PDU, indicate whether for last D2D communication objective address mode by increasing M field in the MAC head that D2D communication addressing MAC CE is corresponding simultaneously.
28. systems according to claim 27, is characterized in that:
When the instruction of M field is not last D2D communication objective address, the byte number that MAC head corresponding to the communication objective address of this D2D takies also is comprised in the MAC head that D2D communication addressing MAC CE is corresponding, and the byte number of the CE/ data relevant to the communication objective address of this D2D.
29. systems according to claim 19, is characterized in that:
When D2D communication is for broadcast communication, in the MAC head of the instruction corresponding MAC CE in D2D communication source address, use the LCID being specifically designed to instruction broadcast communication; Or use a certain bit in the reserved bit in the MAC head of D2D communication source address MAC CE to be set to represent that current D2D communication is broadcast communication;
When D2D communication is for non-broadcast, in the MAC head of the instruction corresponding MAC CE in D2D communication source address, use the LCID being specifically designed to instruction non-broadcast; Or use a certain bit in the reserved bit in the MAC head of D2D communication source address MAC CE to be set to represent that current D2D communication is non-broadcast;
Wherein, being set in the reserved bit in the MAC head of D2D communication source address MAC CE represents that current D2D communicates as a certain bit of non-broadcast and broadcast communication is same bit.
30. systems according to claim 19, is characterized in that:
During broadcast communication, to the MACCE comprising D2D communication source address and the communication objective address of D2D simultaneously, in MAC CE, do not carry D2D communication objective address field; Or in MAC PDU, do not take the MAC CE of D2D communication objective address MAC head and correspondence.
31. systems according to claim 19, is characterized in that, the MAC head of described format carries D2D communication source address and the communication objective address of D2D, does not carry the MAC CE of MAC head and correspondence, does not comprise the field of LCID.
32. systems according to claim 31, is characterized in that:
When comprising the data of multiple destination node in described MAC PDU, increase whether field E mark is follow-up also has broadcast/group broadcast/unicast info indication information.
33. systems according to claim 32, is characterized in that, the instruction of described E field is follow-up when having broadcast/group broadcast/unicast info, increases the field of length information byte number corresponding to the communication objective address of this D2D before or after the information of D2D communication objective address.
34. systems according to claim 33, it is characterized in that, the instruction of described E field is follow-up when also having broadcast/group broadcast/unicast info, increase again after the field of described length information byte number the communication objective address of this D2D the field of the byte number of CE/ data of being correlated with.
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| CN201410106041.9A CN104936226A (en) | 2014-03-20 | 2014-03-20 | Data transmission method and system of equipment direct-communication system |
| PCT/CN2014/084127 WO2015139409A1 (en) | 2014-03-20 | 2014-08-11 | Method and system for data transmission in a direct device communication system, and storage medium |
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| CN201410106041.9A CN104936226A (en) | 2014-03-20 | 2014-03-20 | Data transmission method and system of equipment direct-communication system |
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