CN101990245B

CN101990245B - Transmission method, transmission device and receiving device for relay link

Info

Publication number: CN101990245B
Application number: CN200910090431.0A
Authority: CN
Inventors: 杨瑾; 梁枫; 毕峰; 袁明; 吴栓栓
Original assignee: ZTE Corp
Current assignee: ZTE Corp
Priority date: 2009-08-04
Filing date: 2009-08-04
Publication date: 2014-08-13
Anticipated expiration: 2029-08-04
Also published as: WO2011015095A1; CN101990245A

Abstract

The invention discloses a transmission method for a relay link. The method comprises the following step of: after packaging a relay MAC (Medium Access Control) control element (R-MAC CE) to be transmitted between an evolved node B (eNB) and a relay node (RN) and an MAC service data unit (MAC SDU) attributed to all nodes in an effective load of the R-MAC protocol data unit (R-MAC PDU), transmitting the R-MAC PDU on a return link between the eNB and the RN. The invention also discloses a transmission device and a receiving device for the relay link. In the transmission device, a packaging unit is used for packaging the R-MAC CE to be transmitted between the eNB and the RN and the MAC SDU attributed to all the nodes in the effective load of the R-MAC PDU and transmitting the R-MAC PDU to a transmission unit. By adopting the method and the device of the invention, the transmission performance on the relay link can be improved.

Description

Transmission method, transmission device and receiving device for relay link

Technical Field

The present invention relates to the field of mobile communications, and in particular, to a transmission method, a transmission apparatus, and a reception apparatus for a Relay link in a mobile communication system including a Relay Node (RN).

Background

Currently, the development of mobile communication requires supporting higher transmission rate, more perfect signal coverage and higher resource utilization. To achieve high transmission rates, communication systems will use higher frequency bands to transmit signals, but on the other hand, high frequencies will introduce large path losses, which in turn affects network coverage. In order to effectively improve network coverage and improve network capacity and resource utilization rate, the relay technology becomes a hot research direction of a mobile communication system.

In a mobile communication system with RN, a User Equipment (UE) has two modes to communicate with an enhanced base station (eNB), one is a direct communication mode in a conventional mobile network, and the other is to realize communication between the UE and the eNB through a relay service of the RN, as shown in fig. 1. In fig. 1, a link between an eNB and an RN is referred to as a backhaul link, a link between the RN and a UE served by the RN is referred to as an access link, a UE served by the RN under the control of the RN is referred to as an R-UE, and the R-UE is an RN subordinate user terminal.

In a Medium Access Control (MAC) layer of a Long Term Evolution (LTE) system, Data between an eNB and a UE is encapsulated into a MAC Protocol Data Unit (PDU) together with a Control Element (CE) related to the MAC layer by taking a MAC Service Data Unit (SDU) as a Unit, and then the MAC PDU is transmitted to a lower layer for further processing and transmission.

The format of MAC PDU of LTE system is shown in fig. 2, the MAC PDU is divided into two parts, namely, MAC PDU header and MAC PDU payload, wherein in one MAC PDU, the header part is before and the payload part is after. The MAC PDU header contains a plurality of MAC PDU sub-headers, the payload part contains several MAC SDUs and MAC CEs, and may also include padding bytes introduced according to the length specification of the MAC PDU, where the MAC CEs precede and follow the MAC SDUs and possibly the padding bytes. Each MAC PDU subheader corresponds to a MAC SDU, MAC CE, or stuff byte in the payload, respectively, and indicates the related information of the corresponding MAC SDU or MAC CE, or indicates the stuff byte. The arrangement sequence of each MAC PDU subheader in the MAC PDU header corresponds to the arrangement sequence of the MAC CE, the MAC SDU and the padding bytes in the effective load one by one.

The MAC PDU subheaders are divided into two types, a subheader format for MAC SDU and a subheader format for MAC CE or stuff byte. The subheader format for the MAC SDU is shown in fig. 3 and 4, where fig. 3 and 4 are respectively schematic structural diagrams of a subheader corresponding to the MAC SDU in a MAC PDU transmitted between an existing eNB and a UE, the subheader format is represented in a form of 1 byte as a row, and an Oct in the figure represents a byte, and an Oct in other figures herein also means here, which is not described in detail below; and the L region in fig. 3 is 7 bits (bit) and the L region in fig. 4 is 15 bits. The format of the subheader for the MAC CE or the padding byte is shown in fig. 5, and fig. 5 is a schematic structural diagram of the subheader corresponding to the MAC CE or the padding byte in the MAC PDU transmitted between the existing eNB and the UE.

As shown in fig. 3 and 4, it can be seen that the sub-header for the MAC SDU can occupy 2 bytes or 3 bytes, and as shown in fig. 5, the sub-header for the MAC CE or the stuff byte can occupy 1 byte. The following explains the respective indication information referred to in fig. 3, 4 and 5, and the meaning of the respective indication information is as follows:

r-1bit, reserved bit, no indicating meaning;

e-1bit, used to indicate that this subheader is followed by another MAC PDU subheader, or the beginning of the payload;

LCID-5bit, indicating the related attribute of MAC SDU or MAC CE corresponding to the sub-head, or indicating the filling byte;

f-1bit for indicating the length of L area as 7bit or 15 bit;

l-7bit or 15bit, which is used to indicate the information length of the corresponding MAC SDU.

It should be noted that: the subheader used for the MAC SDU is represented by each indication information contained in the subheader structure, and may be represented as an R/E/LCID/F/L subheader; the subheader for the MAC CE or the stuff byte is represented by the respective indication information contained in the subheader structure, and may be represented as an R/E/LCID subheader. Since the length of the MAC CE information is fixed, an L field indicating the length is not necessary in the subheader corresponding to the MAC CE, and further, an F indicating bit indicating the length of the L field is not necessary.

The format of the MAC PDU is used for processing and packaging MAC SDUs and MAC CEs between the eNB and the UE in an MAC layer in an LTE system, the eNB packages the MAC SDUs and the MAC CEs of each UE into the MAC PDU which is transmitted to a lower layer for further processing and then transmitted to the UE, and the UE also packages the MAC SDUs and the MAC CEs which are ready to be transmitted to the eNB into the MAC PDU which is transmitted to the lower layer for further processing and then transmitted to the eNB.

In a relay system, the transmission of MAC SDUs and MAC CEs on an access link between an RN and an R-UE may follow the above existing MAC PDU format between an eNB and a UE, but on a backhaul link between an eNB and an RN, the existing LTE MAC PDU format cannot completely adapt to the requirements of the transmission of MAC SDUs and MAC CEs between an eNB and an RN, because: on one hand, the original MAC PDU encapsulates the MAC SDU and the MAC CE of the same UE, and all information contained in one MAC PDU belongs to the same UE; however, the transmission on the backhaul link may include U-MAC SDUs of a plurality of R-UEs, R-MAC SDUs between the RN and the eNB, and R-MAC CEs, and if the existing MAC PDU format is adopted, there is a problem that information indicating the RN and the plurality of R-UEs cannot be included and distinguished at the same time. On the other hand, if U-MAC SDUs of a plurality of UEs under the RN and R-MAC SDUs and R-MAC CEs between the RN and the eNB are separately encapsulated and transmitted in the above-mentioned conventional MAC PDU format on the backhaul link, the resources of the backhaul link cannot be effectively utilized, and meanwhile, effective scheduling transmission cannot be performed according to the requirements of each UE or RN. In summary, both of these problems on the backhaul link of the relay system affect the transmission performance on the relay link. Currently, no effective solution has been proposed to improve the transmission performance on the relay link in view of the above two problems.

Disclosure of Invention

In view of the above, the present invention provides a transmission method, a transmission apparatus and a receiving apparatus for a relay link, which can improve the transmission performance on the relay link.

In order to achieve the purpose, the technical scheme of the invention is realized as follows:

a transmission method for a relay link, the method comprising: in the effective load of a relay media access control protocol data unit (R-MAC PDU), after a relay MAC control element (R-MAC CE) to be transmitted between an enhanced base station (eNB) and a relay station (RN) and an MAC service data unit (MAC SDU) belonging to each node are packaged, the R-MAC PDU is transmitted on a return link between the eNB and the RN;

and respectively indicating each node to which the MAC SDU packaged in the effective load belongs through node indication information packaged in an R-MAC PDU header, wherein the nodes comprise an RN and an RN subordinate user terminal (R-UE).

Wherein the R-MAC CE is an RN-related MAC control element;

the MAC SDU belongs to RN or R-UE; the MAC SDU belonging to the RN is specifically R-MAC SDU, and the MAC SDU belonging to the R-UE is specifically U-MAC SDU.

Wherein, the Node indication information specifically indicates a Node identifier (Node ID) of a Node to which each MAC SDU belongs.

Wherein, at least one R-MAC PDU payload is encapsulated with: k R-MAC CEs; m R-MAC SDUs; n U-MAC SDUs, wherein m is more than or equal to 0, k and n is more than or equal to 1.

Wherein, a R-MAC PDU payload is further encapsulated with a stuffing byte, and the stuffing byte is positioned at the end of the payload part.

The node indication information specifically includes: the R-MAC PDU head comprises a sub-head indicating MAC SDU; one MAC SDU sub-head correspondingly indicates one MAC SDU, and the MAC SDU sub-head comprises the Node ID of the Node to which the indicated MAC SDU belongs;

the R-MAC PDU header further comprises: a subheader indicating the R-MAC CE, and optionally a subheader indicating the padding bytes; one R-MAC CE subheader corresponds to one R-MAC CE.

The format of the MAC SDU subheader specifically includes: R/R/E/LCID/F/L/Node ID; the format of the subheader of the R-MAC CE or the subheader of the padding bytes is specifically: R/R/E/LCID; wherein,

when the current MAC SDU sub-head corresponds to the indication R-MAC SDU, the Node ID specifically indicates the RN ID in the current MAC SDU sub-head;

when the current MAC SDU sub-head corresponds to the indication U-MAC SDU, the Node ID specifically indicates the R-UE ID of the R-UE to which the MAC SDU belongs in the current MAC SDU sub-head.

The node indication information specifically includes: the R-MAC PDU head comprises an S subhead; one S subhead indicates one or more subheads corresponding to one or more MAC SDUs belonging to the same node;

the R-MAC PDU header further comprises: a subheader indicating the R-MAC CE, a subheader indicating the MAC SDU, and optionally a subheader indicating the padding bytes; one MAC SDU sub-head correspondingly indicates one MAC SDU, and one R-MAC CE sub-head correspondingly indicates one R-MAC CE.

The S subheader further performs unified indication on the subheader number of one or more MAC SDUs corresponding to the indication belonging to the same Node and the corresponding Node ID included in the R-MAC PDU header.

Determining Node IDs of nodes to which one or more sub-heads indicating MAC SDUs belong, corresponding to the sub-heads indicating the MAC SDUs, contained in the header according to the packaging sequence of the one or more S sub-heads contained in the R-MAC PDU header and the indication of each S sub-head; wherein, the subheads corresponding to the MAC SDU belonging to the same node are adjacent in sequence; and the MAC SDU sub-heads corresponding to different nodes are in one-to-one correspondence with the corresponding S sub-head sequences.

Wherein, the packaging sequence of the content included in the effective load is in one-to-one correspondence with the packaging sequence of the corresponding subheader; wherein,

the encapsulation sequence of the content included in the payload is in turn: one or more R-MAC CEs precede; followed by one or more MAC SDUs; and finally optional padding bytes;

the packaging sequence of the sub-heads is as follows: one or more subheaders corresponding to the indicated R-MAC CE are preceding; followed by one or more S subheads; sequentially packaging one or more sub-heads corresponding to the indicated MACSDU according to the sequence of the S sub-heads; finally, an optional subheader corresponding to the indication stuff byte.

The format of the S subheader is R/R/E/SDU number/Node ID specifically; the format of the subheader of the MAC SDU specifically is: R/R/E/LCID/F/L; the format of the R-MAC CE sub-header or the stuffing byte sub-header is specifically as follows: R/R/E/LCID; wherein,

in the current R-MAC CE subheader, the E indicating bit specifically indicates: the current R-MAC CE sub-header is followed by another R-MAC CE sub-header or an S sub-header;

in the current S subheader, the E indication bit specifically indicates: the next S subhead or the MAC SDU subhead follows the current S subhead;

in other types of current subheaders besides the R-MAC CE subheader and the S subheader, the E indicating bit specifically indicates: the current subheader is followed by another subheader, or the start of the payload.

Wherein, in the current S subheader, SDU No. specifically indicates: the number of MAC SDU sub-heads belonging to the node corresponding to the current S sub-head.

When the corresponding indication Node of the current S subheader is RN, Node ID specifically indicates RN ID in the current S subheader;

and when the corresponding indication Node of the current S subhead is R-UE, the Node ID specifically indicates the R-UE ID in the current S subhead.

The node indication information specifically includes: the R-MAC PDU head comprises a subhead indicating MAC SDU; one MAC SDU sub-head correspondingly indicates one MAC SDU, and a D indicating bit is adopted in the MAC SDU sub-head to indicate whether the MAC SDU corresponding to the current sub-head and the MAC SDU corresponding to the previous sub-head belong to the same node or not;

The format of the MAC SDU subheader specifically includes: R/D/E/LCID/F/L or R/D/E/LCID/F/L/Node ID; the format of the R-MAC CE sub-header or the stuffing byte sub-header is specifically as follows: R/R/E/LCID; wherein,

in the subhead of the current MAC SDU, when the D indicating bit indicates that the MAC SDU corresponding to the subhead of the current MAC SDU and the MAC SDU corresponding to the previous subhead do not belong to the same Node, the format adopted by the subhead of the current MAC SDU is R/D/E/LCID/F/L/Node ID;

in the sub-heads of the current MAC SDU, when the D indicating bit specifically indicates that the MAC SDU corresponding to the sub-head of the current MAC SDU and the MAC SDU corresponding to the previous sub-head are indicated to belong to the same node, the format adopted by the sub-head of the current MAC SDU is R/D/E/LCID/F/L.

The format adopted by the MAC SDU sub-head is R/D/E/LCID/F/L/Node ID, and when the current MAC SDU sub-head correspondingly indicates R-MAC SDU, the Node ID specifically indicates RN ID;

and when the subheader of the current MAC SDU corresponds to the indication U-MAC SDU, the Node ID specifically indicates the R-UEID.

Wherein, in the R-MAC PDU head, one or more MACSDU subheads which correspondingly indicate to belong to the same node are adjacent in sequence;

correspondingly indicating one or more MAC SDU subheads belonging to the same Node, wherein the first MAC SDU subhead comprises Node identification information and indicates a Node ID; then, in the MAC SDU subheader of the same Node, which is adjacent in sequence, the Node ID is not required to be indicated again.

Wherein, the packaging sequence of the content included in the payload of one R-MAC PDU is in one-to-one correspondence with the packaging sequence of the corresponding subheader; wherein,

the packaging sequence of the sub-heads is as follows: one or more subheaders corresponding to the indicated R-MAC CE are preceding; followed by one or more subheaders corresponding to the indicated MAC SDU; finally, an optional subheader corresponding to the indication stuff byte.

Wherein the R-UE ID specifically includes: a cell radio network temporary identity (C-RNTI) of the R-UE, and other identification information uniquely identifying one R-UE between the eNB and the RN.

A transmission apparatus for a relay link, the apparatus comprising: an indication information generation unit, a packaging unit, and a transmission unit; wherein,

the indication information generating unit is used for generating node indication information of the node to which the MAC SDU packaged in the effective load belongs, transmitting the node indication information to the packaging unit and packaging the node indication information in an R-MAC PDU head;

the packaging unit is used for packaging the R-MAC CE to be transmitted between the eNB and the RN and the MAC SDU belonging to each node in the effective load of the R-MAC PDU; encapsulating node indication information in an R-MAC PDU header; and transmitting the R-MAC PDU to the transmission unit;

a transmission unit, configured to transmit the R-mac pdu over a backhaul link between the eNB and the RN.

Wherein, the encapsulating unit is further configured to encapsulate at least: k R-MAC CEs; m R-MAC SDUs; n U-MAC SDUs, wherein m is more than or equal to 0, k and n is more than or equal to 1.

Wherein, the encapsulating unit is further configured to further encapsulate a padding byte in a payload of an R-MAC PDU, and the padding byte is located at the end of the payload portion.

Wherein, the indication information generating unit is further configured to include, as the Node indication information, a Node ID of a corresponding Node in a subheader of the indication MAC SDU.

The indication information generating unit is further configured to use a format of the MAC SDU subheader specifically as follows: R/R/E/LCID/F/L/Node ID; wherein,

when the current MAC SDU sub-head corresponds to the indication R-MAC SDU, Node ID specifically indicates RN ID in the current MAC SDU sub-head;

when the current MAC SDU sub-head corresponds to the indication U-MAC SDU, the Node ID specifically indicates the R-UE ID in the current MAC SDU sub-head.

The indication information generating unit is further configured to use an S subheader in an R-MAC PDU header as the node indication information;

wherein one S subheader indicates one or more MAC SDU subheaders belonging to the same node.

The indication information generating unit is further configured to use the format of the S subheader as the Node indication information to be specifically R/E/SDU number/Node ID;

wherein, the E indicating bit specifically indicates: the next S subhead after the current S subhead is another S subhead or a subhead of the MAC SDU;

SDU No. specific indication: the number of MAC SDU sub-heads belonging to the node corresponding to the current S sub-head;

node ID indicates specifically: node identification information of the corresponding node; when the corresponding Node is RN, the Node ID is RN ID, and when the corresponding Node is R-UE, the Node ID is R-UE ID.

Wherein, the indication information generating unit is further configured to include a D indication bit, or a D indication bit and a Node ID in a subheader of the MAC SDU as the Node indication information.

The indication information generating unit is further configured to use a format of the MAC SDU subheader including the node indication information to specifically be: R/D/E/LCID/F/L or R/D/E/LCID/F/L/Node ID; wherein,

in the subhead of the current MAC SDU, when the D indicating bit indicates that the MAC SDU corresponding to the indication of the subhead of the current MAC SDU and the MAC SDU corresponding to the indication of the previous subhead do not belong to the same Node, the adopted format is R/D/E/LCID/F/L/Node ID specifically; wherein,

node ID indicates specifically: node identification information of the corresponding node; when the corresponding Node is RN, the Node ID is RN ID, and when the corresponding Node is R-UE, the Node ID is R-UE ID;

in the sub-head of the current MAC SDU, when the D indicating bit indicates that the MAC SDU corresponding to the indication of the current MAC SDU sub-head and the MAC SDU corresponding to the indication of the previous sub-head belong to the same node, the adopted format is R/D/E/LCID/F/L.

A receiving apparatus for a relay link, the apparatus comprising: an indication information analysis unit and a decapsulation unit; wherein,

the indication information analysis unit is used for analyzing the node indication information encapsulated in the R-MAC PDU head and transmitting the analysis result to the decapsulation unit; the node indication information is node indication information of a node to which an MAC SDU packaged in an effective load of an R-MAC PDU belongs;

and the decapsulation unit is used for decapsulating the R-MAC CE to be transmitted between the eNB and the RN and the MAC SDU belonging to each node in the R-MAC PDU payload according to the analysis result to obtain the R-MAC CE in the payload and the MAC SDU belonging to each node.

Wherein, the decapsulating unit is further configured to parse out information encapsulated in a payload of an R-MAC PDU, and at least includes: k R-MAC CEs; m R-MAC SDUs; n U-MAC SDUs, wherein m is more than or equal to 0, k and n is more than or equal to 1.

The decapsulation unit is further configured to parse padding bytes from an R-MAC PDU payload; the stuff bytes are located at the end of the payload section.

The indication information analyzing unit is further configured to analyze that the node indication information is: and Node ID of the corresponding Node contained in the subheader of the indication MAC SDU.

The format of the MAC SDU subheader specifically includes: R/R/E/LCID/F/L/Node ID;

the indication information analysis unit is further configured to analyze the current MAC SDU subheader and obtain a Node ID of a Node to which the corresponding MAC SDU belongs from the MAC SDU subheader; and transmitting the Node ID obtained by analysis to the decapsulation unit.

The indication information analyzing unit is further configured to analyze that the node indication information is: an S subheader included in an R-MAC PDU header; wherein one S subheader indicates one or more MAC SDU subheaders belonging to the same node.

The format of the S subheader is R/R/E/SDU number/Node ID specifically;

the indication information analyzing unit is further configured to analyze an E indication bit specific indication: the next S subhead or the MAC SDU subhead follows the current S subhead;

the indication information parsing unit is further configured to parse out an SDU No. specific indication: the number of MAC SDU sub-heads belonging to the node corresponding to the current S sub-head;

the indication information analyzing unit is further configured to analyze a Node ID specific indication: if the corresponding Node is RN, the Node ID is RN ID; or, the indication information parsing unit is further configured to specifically indicate that: if the corresponding Node is R-UE, the Node ID is R-UE ID.

The indication information analyzing unit is further configured to analyze that the node indication information is: and D indicating bits or D indicating bits and Node IDs contained in the subheaders of the MAC SDUs.

The indication information parsing unit is further configured to parse out a D-indicator bit indication: the MAC SDU corresponding to the current MAC SDU sub-head and the MAC SDU corresponding to the previous sub-head do not belong to the same node; the format of the current MAC SDU sub-header is specifically: R/D/E/LCID/F/L/Node ID;

the indication information analyzing unit is further configured to analyze a D indication bit indication: the MAC SDU corresponding to the current MAC SDU sub-head and the MAC SDU corresponding to the previous sub-head belong to the same node; the format of the current MAC SDU sub-header is specifically: R/D/E/LCID/F/L.

The format of the MAC SDU subheader containing the node indication information is specifically: under the condition of R/D/E/LCID/F/L/Node ID, the indication information analysis unit is further used for analyzing the specific indication of the Node ID: the RN ID of the corresponding node; or, the indication information parsing unit is further configured to parse out the Node ID specific indication: R-UE ID.

In the invention, in the R-MAC PDU effective load controlled by the relay media access, the R-MAC CE to be transmitted between the eNB and the RN and the MAC SDU belonging to each node are packaged, and then the R-MAC PDU is transmitted on a return link between the eNB and the RN. And respectively indicating each node to which the MAC SDU packaged in the effective load belongs by packaging node indication information in the head of the R-MAC PDU.

The invention utilizes a new MAC PDU format suitable for a return link, namely an R-MAC PDU format, to process and package U-MAC SDUs of one or more R-UEs between an eNB and an RN, R-MAC SDUs of the RN and R-MAC CEs. Herein, the R-MAC PDU may be referred to as a Relay Medium Access control protocol data Unit. U-MAC SDUs of a plurality of R-UEs and R-MAC CEs and R-MAC SDUs of RNs can be simultaneously contained in one R-MAC PDU as required. The transmission after the data and the control information are encapsulated by adopting the R-MAC PDU format can solve the two problems, on one hand: MAC SDUs indicating the RN and a plurality of R-UEs can be simultaneously contained and distinguished in one R-MACPDU; on the other hand: just because the U-MAC SDU of a plurality of R-UE, the R-MAC SDU of RN and R-MAC CE are contained in one R-MAC PDU, the resource utilization rate of a return link can be improved, the requirements of the R-UE and the RN on data delay, data quantity and the like can be more effectively met, and the fairness of system resource scheduling is improved. Therefore, the transmission performance on the relay link is improved.

Drawings

Fig. 1 is a schematic structural diagram of a relay network;

fig. 2 is a schematic diagram of a MAC PDU structure of a conventional LTE system;

fig. 3 is a schematic diagram of a structure of a subheader of a conventional MAC SDU;

fig. 4 is another schematic structural diagram of a subheader of a conventional MAC SDU;

FIG. 5 is a diagram illustrating a structure of a subheader of a conventional MAC CE or padding byte;

FIG. 6 is a schematic flow chart of the implementation of the method of the present invention;

FIG. 7 is a diagram illustrating an R-MAC PDU structure according to a first embodiment of the present invention;

fig. 8 is a schematic diagram of a sub-header of a MAC SDU according to the first embodiment of the present invention;

fig. 9 is another schematic structural diagram of a subheader of a MAC SDU according to the first embodiment of the present invention;

fig. 10 is a schematic diagram of another structure of a subheader of a MAC SDU according to the first embodiment of the present invention;

fig. 11 is a schematic diagram of another structure of a subheader of a MAC SDU according to the first embodiment of the present invention;

FIG. 12 is a diagram illustrating an R-MAC PDU structure according to a second embodiment of the present invention;

FIG. 13 is a schematic structural view of the S sub-head of the second embodiment of the present invention;

FIG. 14 is another schematic structural diagram of the S subhead of the second embodiment of the present invention;

FIG. 15 is a diagram illustrating an R-MAC PDU structure according to a third embodiment of the present invention;

fig. 16 is a schematic diagram of a sub-header of a MAC SDU according to a third embodiment of the present invention;

fig. 17 is another schematic structural diagram of a subheader of a MAC SDU according to the third embodiment of the present invention;

fig. 18 is a schematic diagram of another structure of a subheader of a MAC SDU according to the third embodiment of the present invention;

fig. 19 is a schematic diagram of another structure of a subheader of a MAC SDU according to the third embodiment of the present invention;

fig. 20 is a structural diagram illustrating that the subheader of the MAC SDU does not include a Node ID field in the third embodiment of the present invention;

fig. 21 is another schematic structural diagram of the MAC SDU subheader of the third embodiment of the present invention without Node ID fields;

FIG. 22 is a diagram illustrating the structure of an R-MAC PDU in example 1;

FIG. 23 is a diagram illustrating the structure of an R-MAC PDU in example 2;

FIG. 24 is a diagram illustrating the structure of an R-MAC PDU in example 3;

FIG. 25 is a diagram illustrating the structure of an R-MAC PDU in example 4;

FIG. 26 is a diagram illustrating the structure of an R-MAC PDU in example 5;

FIG. 27 is a diagram illustrating the structure of an R-MAC PDU in example 6;

FIG. 28 is a schematic diagram of the construction of the apparatus of the present invention;

FIG. 29 is a schematic view of another embodiment of the present invention.

Detailed Description

The basic idea of the invention is: and in the effective load of the R-MAC PDU, after the R-MAC CE to be transmitted between the eNB and the RN and the MAC SDU belonging to each node are packaged, the R-MAC PDU is transmitted on a return link between the eNB and the RN. And respectively indicating each node to which the MAC SDU packaged in the effective load belongs by packaging node indication information in the head of the R-MAC PDU.

The following describes the embodiments in further detail with reference to the accompanying drawings.

As shown in fig. 6, a transmission method for a relay link includes:

and step 101, packaging the MAC SDU and the R-MAC CE transmitted between the eNB and the RN by adopting the R-MAC PDU.

Wherein, the R-MAC CE and the MAC SDU belonging to each node are packaged in the effective load of the R-MAC PDU. And respectively indicating each node to which the MAC SDU packaged in the effective load belongs through the node indication information packaged in the R-MAC PDU header. The node here includes: RN and R-UE.

And 102, transmitting the R-MAC PDU on a backhaul link between the eNB and the RN after encapsulation.

For the technical scheme composed of step 101 to step 102, the R-MAC CE is a MAC control element related to the RN. MAC SDU belongs to RN or R-UE; the MAC SDU belonging to the RN is specifically an R-MAC SDU, and the MAC SDU belonging to the R-UE is specifically a U-MAC SDU.

Here, the node indication information specifically indicates a node identification (NodeID) of a node to which each MAC SDU belongs. Wherein, when the MAC SDU belongs to the RN, the node indication information specifically indicates: the RN ID of the RN to which the MAC SDU belongs, namely the Node ID is the RN ID at the moment; when the MAC SDU belongs to R-UE, the node indication information specifically indicates that: the R-UE ID of the R-UE to which the MAC SDU belongs, i.e. the Node ID, is now the R-UE ID.

Here, one R-MAC PDU payload is encapsulated with at least: k R-MAC CEs; m R-MAC SDUs; n U-MAC SDUs, wherein m is more than or equal to 0, k and n is more than or equal to 1.

Here, a R-MAC PDU payload is further encapsulated with a stuff byte, which is located at the end of the payload part.

Three different specific cases of the node indication information are respectively explained below.

In the first case: the node indication information is specifically: the R-MAC PDU head comprises a sub-head indicating MAC SDU; one MAC SDU sub-head correspondingly indicates one MAC SDU, and the MAC SDU sub-head comprises the Node ID of the indicated Node to which the MAC SDU belongs.

The R-MAC PDU header also comprises: a subheader indicating the R-MAC CE, and optionally a subheader indicating the padding bytes; one R-MAC CE subheader corresponds to one R-MAC CE.

Here, the format of the MAC SDU subheader specifically includes: R/R/E/LCID/F/L/Node ID; the format of the subheader or the padding byte subheader of the R-MAC CE is specifically as follows: R/R/E/LCID. When the current MAC SDU subhead corresponds to the indication R-MAC SDU, the Node ID specifically indicates the RN ID in the current MAC SDU subhead; and when the current MAC SDU sub-head corresponds to the indication U-MAC SDU, the NodeID specifically indicates the R-UE ID of the R-UE to which the MAC SDU belongs in the current MAC SDU sub-head.

Here, the R-UE ID specifically includes: C-RNTI of R-UE, or other identity uniquely identifying R-UE between eNB and RN.

It should be noted that: there are multiple subheaders in the R-MAC PDU. The types of subheads include: a subheader type for R-MAC CE, a subheader type for MAC SDU, and optionally a subheader type for padding bytes. The packing order of the contents included in the payload corresponds one-to-one to the packing order of the corresponding subheaders.

Wherein, the packaging sequence of the contents included in the effective load is as follows in sequence: one or more R-MAC CEs precede; followed by one or more MAC SDUs; and finally optional padding bytes; correspondingly, the packaging sequence of the sub-heads is as follows: one or more subheaders corresponding to the indicated R-MAC CE are preceding; followed by one or more subheaders corresponding to the indicated MAC SDU; finally, an optional subheader corresponding to the indication stuff byte.

In the second case: the node indication information is specifically: the R-MAC PDU head comprises an S subhead; one S subheader indicates one or more subheaders corresponding to one or more MAC SDUs belonging to the same node.

In this case, the R-MAC PDU header further includes: a subheader indicating the R-MAC CE, a subheader indicating the MAC SDU, and optionally a subheader indicating the padding bytes; one MAC SDU sub-head correspondingly indicates one MAC SDU, and one R-MAC CE sub-head correspondingly indicates one R-MAC CE.

Here, the S subheader further performs a unified indication on the number of subheaders corresponding to one or more MAC SDUs indicating to belong to the same Node and the corresponding Node IDs included in the R-MAC PDU header.

Determining Node IDs of nodes to which the indicated MAC SDU belongs, corresponding to one or more sub-heads of the indicated MAC SDU contained in the header, according to the encapsulation sequence of one or more S sub-heads contained in the R-MAC PDU header and the indication of each S sub-head; wherein, the subheads corresponding to the MAC SDU belonging to the same node are adjacent in sequence; and the MAC SDU sub-heads corresponding to different nodes are in one-to-one correspondence with the corresponding S sub-head sequences.

Here, the packing order of the contents included in the payload corresponds one-to-one to the packing order of the corresponding subheader. Wherein, the packaging sequence of the contents included in the effective load is as follows in sequence: one or more R-MAC CEs precede; followed by one or more MAC SDUs; and finally optional padding bytes.

Here, the format of the S subheader is specifically R/E/SDU number/Node ID; the format of the MAC SDU sub-header specifically comprises the following steps: R/R/E/LCID/F/L; the format of the R-MAC CE sub-header or the stuffing byte sub-header is specifically as follows: R/R/E/LCID.

Wherein, in the current R-MAC CE subheader, the E indicating bit specifically indicates: the current R-MAC CE subheader is followed by another R-MAC CE subheader, or an S subheader. In the current S subheader, the E indication bit specifically indicates: the current S subheader is followed by another S subheader, or MAC SDU subheader. In other types of current subheaders besides the R-MAC CE subheader and the S subheader, the E indicating bit specifically indicates: the current subheader is followed by another subheader, or the start of the payload.

Here, in the current S subheader, SDU No. specifically indicates: the number of MAC SDU sub-heads belonging to the node corresponding to the current S sub-head.

Here, when the current S subheader corresponds to the indication RN, the Node ID specifically indicates the RN ID; when the R-UE is correspondingly indicated, the No de ID specifically indicates the R-UE ID.

Here, the R-UE ID specifically includes: C-RNTI, or other identity that uniquely identifies the R-UE between the eNB and the RN.

In the third case: the node indication information is specifically: the R-MAC PDU head comprises a subhead indicating MAC SDU; one MAC SDU sub-head correspondingly indicates one MAC SDU, and a D indicating bit is adopted in the MAC SDU sub-head to indicate whether the MAC SDU corresponding to the current sub-head and the MAC SDU corresponding to the previous sub-head belong to the same node.

Here, the format of the MAC SDU subheader specifically includes: R/D/E/LCID/F/L or R/D/E/LCID/F/L/Node ID; the format of the R-MAC CE sub-header or the stuffing byte sub-header is specifically as follows: R/R/R/LCID. Wherein,

Here, the format adopted by the sub-head of the MAC SDU is R/D/E/LCID/F/L/Node ID, and when the sub-head of the current MAC SDU indicates R-MAC SDU correspondingly, the Node ID indicates RN ID specifically; when the subheader of the current MAC SDU corresponds to the indication U-MAC SDU, the Node ID specifically indicates the R-UE ID.

Here, in the R-MAC PDU header, one or more MAC SDU subheaders corresponding to indications belonging to the same node are sequentially adjacent in order. Correspondingly indicating one or more MAC SDU subheads belonging to the same Node, wherein the first MAC SDU subhead comprises Node identification information and indicates a Node ID; then, in the MAC SDU subheader of the same Node, which is adjacent in sequence, the Node ID is not required to be indicated again.

Here, the R-UE ID specifically includes: C-RNTI, or other identification information uniquely identifying the R-UE between the eNB and the RN.

In summary, the present invention mainly includes the following three specific implementation schemes, which are applicable to the format and system of R-MAC PDU of the backhaul link, so as to effectively meet the requirement of R-UE and improve the utilization rate of the backhaul link resource. Each of which is specifically described below.

The first scheme is as follows:

as shown in FIG. 7, the R-MAC PDU consists of two parts, a R-MAC PDU header and an R-MAC PDU payload, where the header part precedes and the trailer payload part follows in one R-MAC PDU. The header of the R-MAC PDU comprises a plurality of subheaders, the payload part comprises one or more MAC SDUs, which can be U-MAC SDUs belonging to a certain R-UE, R-MAC SDUs belonging to RN and one or more R-MAC CEs, and the payload part can also comprise padding of certain padding bytes introduced according to the length specification of the R-MAC PDU. The R-MAC CE is preceded and followed in the payload by one or more MAC SDUs, and possibly padding bytes. Each R-MAC PDU subheader respectively corresponds to one MAC SDU, R-MAC CE or padding byte in the effective load, and indicates the relevant information of the corresponding MAC SDU or R-MAC CE or indicates the padded padding byte. The arrangement sequence of each R-MAC PDU subheader in the R-MAC PDU header corresponds to the arrangement sequence of R-MAC CE, MAC SDU and possible padding bytes in the effective load one by one.

The R-MAC PDU subheader has two types, namely a subheader format used for indicating MAC SDU and a subheader format used for indicating R-MAC CE or padding bytes.

Wherein, the sub-header for indicating the MAC SDU can occupy 3-5 bytes, and the structure is R/E/LCID/F/L/Node ID, as shown in fig. 8, 9, 10, and 11, wherein fig. 8 is a schematic structural diagram of the R-MAC PDU corresponding to the sub-header of the MAC SDU in the first solution of the present invention, wherein the Node ID area occupies 16 bits, and the L area occupies 7 bits; fig. 9 is another schematic structural diagram of a subheader corresponding to a MAC SDU in an R-MAC PDU according to the first embodiment of the present invention, in which a Node ID region occupies 16 bits, and an L region occupies 15 bits; fig. 10 is a schematic diagram of another structure of a subheader corresponding to a MAC SDU in an R-MAC PDU according to the first embodiment of the present invention, in which a Node ID region occupies 8 bits, and an L region occupies 7 bits; fig. 11 is a schematic diagram of another structure of a subheader corresponding to a MAC SDU in an R-MAC PDU according to the first embodiment of the present invention, where a Node ID region occupies 8 bits, and an L region occupies 15 bits.

The subheader indicating that the subheader belonging to the R-MAC CE or the stuff byte occupies 1 byte, has the structure of R/E/LCID, and has the same structure as the existing MAC CE subheader as shown in fig. 5.

The meanings of the respective pieces of instruction information in the subheaders of fig. 5, 8 to 11 are as follows:

r-1bit, reserved bit, no indicating meaning;

e-1bit, indicating that this subheader is followed by another R-MAC PDU subheader, or the beginning of the payload;

LCID-5bit, indicating the related attribute of MAC SDU or R-MAC CE corresponding to the sub-head, or indicating the filling byte;

f-1bit for indicating the length of L area as 7bit or 15 bit;

l-7bit or 15bit, which is used to indicate the information length of the corresponding MAC SDU;

node ID-8bit or 16 bit; and when the subheader corresponds to R-MAC SDU, Node ID indicates RN ID; when the subheader corresponds to the U-MAC SDU, the Node ID indicates the R-UE ID; wherein the R-UE ID may be the C-RNTI of the R-UE or other ID capable of uniquely identifying the R-UE between the eNB and the RN.

The encapsulation sequence of each subheader in the R-MAC PDU header is as follows: one or more subheaders corresponding to the R-MAC CE are preceded, followed by one or more subheaders corresponding to the MAC SDU, and finally, possibly, a subheader associated with the padding bytes.

The payload portion of the R-MAC PDU contains three types of content, R-MAC CE, one or more MAC SDUs belonging to the RN or R-UE, and padding bytes that may be performed depending on the R-MAC PDU length specification. The encapsulation sequence of each R-MAC CE, MAC SDU or stuffing byte in the effective load part is in one-to-one correspondence with the corresponding sequence of each subheader in the R-MAC PDU header.

Wherein the R-MAC CE in the R-MAC PDU payload may include one or more of the following information: a buffer status report, a C-RNTI indication, a discontinuous transmission configuration indication, a contention resolution identification indication, a time advance adjustment indication, a power control indication.

One or more MAC SDUs in the R-MAC PDU payload can belong to the RN and can also belong to different R-UEs respectively; there may be one or more U-MAC SDUs belonging to the same R-UE, and there may also be one or more R-MAC SDUs belonging to the RN. The specific composition mode of the MAC SDU is consistent with the mode of MAD SDU between eNB and UE in an LTE system, and corresponding ID information contained in a corresponding subheader.

In addition, according to the length regulation of the R-MAC PDU, after the head part of the R-MAC PDU and the corresponding R-MAC CE and MAC SDU are sequentially packaged, if the length of the R-MAC PDU does not reach the corresponding specified value, certain bytes of padding bytes are required to be filled in the R-MAC PDU until the length of the R-MAC PDU meets the specified length. The padding byte part is padded at the end of the payload of the R-MAC PDU and adds a corresponding indicator subheader to the R-MAC PDU header for the padding byte, which becomes the last subheader in the R-MAC PDU header part.

Scheme II:

as shown in FIG. 12, the R-MAC PDU consists of two parts, a R-MAC PDU header and an R-MAC PDU payload, where the header part precedes and the trailer payload part follows in one R-MAC PDU. The R-MAC PDU header comprises a plurality of R-MAC PDU subheaders, the payload part comprises one or more MAC SDUs and R-MAC CEs, and the R-MAC PDU header can also comprise padding of certain padding bytes introduced according to the length specification of the R-MAC PDU. The R-MAC CE is preceded and followed by the MAC SDU, and possibly padding bytes, in the payload.

The subheads of the R-MAC PDU are divided into two categories, one category of subheads does not correspond to the content in the payload, but carries out unified indication on the number of the subheads of the MAC SDU and the corresponding node identification, which are contained in the R-MAC PDU head and correspondingly indicate the subheads of the MAC SDU belonging to the same node, and the number is called as an S subhead. The other class corresponds to MAC SDUs or R-MAC CEs or padding bytes in the payload, respectively, indicates relevant information of the corresponding MAC SDUs or R-MAC CEs, or indicates padded padding bytes. The arrangement sequence of the R-MAC PDU sub-headers corresponding to the R-MAC CE, the MAC SDU or the stuffing bytes in the R-MAC PDU header corresponds to the arrangement sequence of the R-MAC CE, the MAC SDU and the possible stuffing bytes in the effective load one by one.

The S sub-header is used to indicate the number of MAC SDU sub-headers belonging to the same Node and the corresponding Node identifier, occupies 2 or 3 bytes, and has a structure of R/E/SDU number/Node ID, as shown in fig. 13 and 14. Fig. 13 is a schematic structural diagram of an S subheader in an R-MAC PDU according to the second embodiment of the present invention, in which a NodeID area occupies 16 bits; FIG. 14 is another schematic diagram of the structure of the S subheader in the R-MAC PDU according to the second embodiment of the present invention, in which the Node ID area occupies 8 bits.

The sub-header for indicating the MAC SDU can occupy 2 or 3 bytes and has a structure of R/E/LCID/F/L, as shown in fig. 3 and 4.

The subheader indicating that the subheader belonging to the R-MAC CE or the padding byte occupies 1 byte, has a structure of R/R/E/LCID, as shown in FIG. 5.

The following explains the respective indication information in fig. 3 to 5 and fig. 13 to 14, and the meanings are as follows:

r-1bit, reserved bit, no indicating meaning;

e-1 bit; in the subheader corresponding to the R-MAC CE, a header indicating that the subheader is followed by another subheader corresponding to the R-MAC CE, or an S subheader; in the S subheader, the S subheader is used to indicate that the S subheader is followed by another S subheader or a subheader corresponding to the MAC SDU; in other types of subheaders, to indicate that this subheader is followed by another subheader, or the start of the payload;

SDU number-5 bit, which indicates the number of MAC SDU sub-heads belonging to the node corresponding to the S sub-head in the R-MAC PDU head;

f-1bit for indicating the length of L area as 7bit or 15 bit;

node ID-8bit or 16 bit; moreover, when the S subheader corresponds to the RN, the Node ID indicates the RN ID; when the S subheader corresponds to R-UE, the Node ID indicates the R-UE ID; the R-UE ID can be C-RNTI of the R-UE or other IDs capable of uniquely identifying the R-UE.

The encapsulation sequence of each subheader in the R-MAC PDU header is as follows: one or more subheaders corresponding to the R-MAC CE are preceded by one or more S subheaders, the corresponding subheaders of the corresponding one or more MAC SDUs are sequentially packaged according to the sequence of the S subheaders, and finally the possible subheaders related to the padding bytes are obtained.

The payload portion of an R-MAC PDU contains three types of content, respectively an R-MAC CE, one or more MAC SDUs belonging to an RN or an R-UE, and padding of padding bytes possible according to the length specification of the R-MAC PDU. The encapsulation sequence of each R-MAC CE, MAC SDU or stuffing byte in the effective load part is in one-to-one correspondence with the corresponding sequence of each subheader in the R-MAC PDU header. When a plurality of MAC SDUs belong to the same R-UE in the R-MAC PDU, the plurality of MAC SDUs are sequentially connected according to the corresponding subheader sequence. And the encapsulation sequence corresponds to the sequence of the corresponding S subheads one by one among all groups of subheads of the MAC SDU corresponding to different R-UE.

Wherein the R-MAC CE in the R-MAC PDU payload may include one or more of the following information: a buffer status report, a discontinuous transmission configuration indication, a C-RNTI indication, a contention resolution identity indication, a time advance adjustment indication, a power control indication.

One or more MAC SDUs in the R-MAC PDU payload can belong to the RN and can also belong to different R-UEs respectively; there may be one or more U-MAC SDUs belonging to the same R-UE, and there may also be one or more R-MAC SDUs belonging to the RN. The specific composition mode of the MAC SDU is consistent with the mode of MAD SDU between eNB and UE in the LTE system.

According to the length regulation of the R-MAC PDU, after the head part of the R-MAC PDU and the corresponding MAC SDU and R-MAC CE are sequentially packaged, if the length of the R-MAC PDU does not reach the corresponding specified value, padding bytes are required to be filled in the R-MAC PDU until the length of the R-MAC PDU meets the specified length. The padding byte part is padded at the end of the payload of the R-MAC PDU, and a corresponding indication subheader is added in the R-MAC PDU header for the padding byte, so that the padding byte becomes the last subheader in the R-MAC PDU header part.

The third scheme is as follows:

as shown in FIG. 15, the R-MAC PDU consists of two parts, a R-MAC PDU header and an R-MAC PDU payload, where the header part precedes and the trailer payload part follows in one R-MAC PDU. The R-MAC PDU head comprises a plurality of R-MAC PDU subheads, the payload part comprises one or more MAC SDUs and R-MAC CEs, and certain padding bytes introduced according to the length specification of the R-MAC PDU can be included. The R-MAC CE is preceded and followed by the MAC SDU and possibly padding bytes in the payload. Each R-MAC PDU subheader respectively corresponds to one MAC SDU, R-MAC CE or padding byte in the effective load, and indicates the relevant information of the corresponding MAC SDU or R-MAC CE or indicates the padded padding byte. The arrangement sequence of each R-MAC PDU subheader in the R-MAC PDU header corresponds to the arrangement sequence of R-MAC CE, MAC SDU and possible padding bytes in the effective load one by one.

Wherein, the sub-header for indicating the MAC SDU can occupy 2-5 bytes, and the structure is R/D/E/LCID/F/L or R/D/E/LCID/F/L/Node ID, as shown in fig. 16-21, where fig. 16 is a schematic structural diagram of the sub-header corresponding to the MAC SDU in the R-MAC PDU according to the third aspect of the present invention, where the Node ID area occupies 16 bits, and the L area occupies 7 bits; fig. 17 is another schematic structural diagram of a subheader corresponding to a MAC SDU in an R-MAC PDU according to a third embodiment of the present invention, where a Node ID region occupies 16 bits, and an L region occupies 15 bits; fig. 18 is a schematic view of another structure of a subheader corresponding to a MAC SDU in an R-MAC PDU according to a third embodiment of the present invention, in which a Node ID region occupies 8 bits, and an L region occupies 7 bits; fig. 19 is a schematic diagram of another structure of the subheader corresponding to the MAC SDU in the R-MAC PDU according to the third embodiment of the present invention, in which the Node ID area occupies 8 bits, and the L area occupies 15 bits. Fig. 20 and fig. 21 are two schematic structural diagrams illustrating that the subheader corresponding to the MAC SDU in the R-MAC PDU according to the third embodiment of the present invention does not include a Node ID region, where the L region in fig. 20 occupies 7 bits; the L region occupies 15 bits in fig. 21.

The following explains each instruction information in fig. 5, 16 to 21, as follows:

r-1bit, reserved bit, no indicating meaning;

d-1bit, indicate whether MAC SDU that this subhead corresponds to and MAC SDU that the previous subhead corresponds to belong to the same node, if MAC SDU that correspond to the previous subhead belongs to the same node, this subhead structure is R/D/E/LCID/F/L, does not indicate the corresponding node label; if not, the subhead structure is R/D/E/LCID/F/L/Node ID, and a Node ID area exists behind the L area to indicate the Node identification of the Node of the MAC SDU corresponding to the subhead;

f-1bit for indicating the length of L area as 7bit or 15 bit;

node ID-8bit or 16 bit; and when the subheader corresponds to R-MAC SDU, Node ID indicates RN ID; when the subheader corresponds to the U-MAC SDU, the Node ID indicates the R-UE ID; the R-UE ID can be C-RNTI of the R-UE or other IDs which can uniquely identify the R-UE between the eNB and the RN.

The payload portion of an R-MAC PDU contains three types of content, respectively an R-MAC CE, one or more MAC SDUs belonging to an RN or an R-UE, and padding of padding bytes possible according to the length specification of the R-MAC PDU. The encapsulation sequence of each R-MAC CE, MAC SDU or stuffing byte in the effective load part is in one-to-one correspondence with the corresponding sequence of each subheader in the R-MAC PDU header.

One or more MAC SDUs in the R-MAC PDU payload can belong to the RN and can also belong to different R-UEs respectively; one or more U-MAC SDUs belonging to the same R-UE can be provided, one or more R-MAC SDUs belonging to the RN can also be provided, and a plurality of MAC SDUs belonging to the RN or the same R-UE are adjacent in sequence. The specific composition mode of the MAC SDU is consistent with the mode of MAD SDU between eNB and UE in the LTE system. When one MAC SDU is the first MAC SDU belonging to RN or a certain R-UE in the R-MAC PDU, the corresponding sub-head indicates RN ID or UE ID information of the R-UE, and then the adjacent MAC SDU does not need to indicate the node identification again if the adjacent MAC SDU belongs to the same node.

In addition, according to the length regulation of the R-MAC PDU, after the head part of the R-MAC PDU and the corresponding R-MAC CE and MAC SDU are sequentially packaged, if the length of the R-MAC PDU does not reach the corresponding specified value, filling bytes with a certain number of bytes into the R-MAC PDU until the length of the R-MAC PDU meets the specified length. The padding byte part is padded at the end of the payload of the R-MAC PDU and adds a corresponding indicator subheader to the R-MAC PDU header for the padding byte, which becomes the last subheader in the R-MAC PDU header part.

It should be noted that: the formats of the R-MAC PDUs involved in the above three schemes are suitable for different system requirements, for example, when the system requirements are: when the data transmitted by the backhaul link belongs to a plurality of R-UEs and the number of MAC SDUs of each R-UE is not large, because the scheme is that Node identification indication is performed in a corresponding subheader for each MAC SDU, under the system requirement, the R-MAC PDU format adopting the first scheme is more suitable, and the MAC SDUs of each Node encapsulated in the R-MAC PDU can be flexibly and effectively indicated. And when the system requirements are: when a plurality of MAC SDUs packaged in the R-MAC PDU belong to a small number of R-UEs and the number of the MAC SDUs of each R-UE is large, because the second scheme and the third scheme are used for uniformly indicating the MAC SDUs belonging to the same node, under the system requirement, the R-MAC PDU format adopting the second scheme and the third scheme is more applicable, and the indicating overhead can be further reduced while related contents in the R-MAC PDU are effectively indicated.

In a word, the R-MAC PDU format for the relay link and the transmission after the data and the control information are encapsulated by the format realize the effective transmission of a plurality of R-UE data on the return link, flexibly adapt to the system requirement, effectively improve the resource utilization rate of the return link and are beneficial to meeting different requirements of the R-UE.

In the following, the three specific implementations described above are illustrated by way of example respectively. Wherein, examples 1 and 2 adopt the R-MAC PDU format involved in scheme one; examples 3 and 4 employ the R-MAC PDU format referred to in scheme two; examples 5 and 6 use the R-MAC PDU format referred to in scheme three.

Example 1:

the eNB encapsulates 5 MAC SDUs belonging to 5R-UEs respectively under the RN, one MAC SDU of the RN and 3 items of R-MAC CE information into one R-MAC PDU to be transmitted to the RN on a relay link, wherein each R-UE is respectively represented as R-UE1 to R-UE5, and the three R-MA CEs are respectively represented as R-MAC CE1 to R-MAC CE 3.

In the header part of the R-MAC PDU, sequentially encapsulating:

3R/R/E/LCID subheaders corresponding to R-MAC CEs, R-MAC CE1 to R-MAC CE 3, respectively, of the payload part, the subheader format being as shown in FIG. 5.

6R/R/E/LCID/F/L/Node ID subheaders corresponding to the MAC SDUs, 5 MAC SDUs corresponding to the payload parts R-UE1 to R-UE5 and 1 MAC SDU transmitted by the eNB to the RN, respectively. Wherein, the C-RNTI of the corresponding R-UE is adopted as the ID identification of the UE, and the RN ID also adopts 16 bits and is filled in the Node ID area of the subheader format shown in figure 8 or figure 9.

And each R-MAC CE and MAC SDU in the R-MAC PDU effective load corresponds to the corresponding sub-head sequence in the R-MAC PDU head one by one. The Node ID information contained in each MAC SDU subheader indicates that the corresponding MAC SDU belongs to RN or a certain R-UE.

Meanwhile, the length of the R-MAC PDU after encapsulation is in accordance with the specified length, padding is not needed, the effective load in the R-MAC PDU does not contain padding bytes, and the corresponding head part does not contain a sub-head indicating the padding bytes.

Example 2:

the RN packages 5 MAC SDUs of the subordinate 4R-UEs, 1 MAC SDU transmitted to the eNB by the RN and 2 items of R-MAC CE information into one R-MAC PDU to be transmitted to the eNB on a relay link, wherein each R-UE is respectively represented as R-UE1 to R-UE4, two R-MAC CEs are respectively represented as R-MAC CE1 and R-MAC CE 2, wherein the R-UE 3 has 2 MAC SDUs, and the other R-UEs have one MAC SDU respectively.

In the header part of the R-MAC PDU, sequentially encapsulating:

2R/R/E/LCID subheaders corresponding to R-MAC CEs, R-MAC CEs 1 to R-MAC CE 3, respectively, of the payload part, the subheader format being as shown in FIG. 5.

The 6R/R/E/LCID/F/L/Node ID subheaders corresponding to the MAC SDUs correspond to a total of 6 MAC SDUs of the payload sections R-UE1 to R-UE4 and RN, respectively. Wherein, other UE IDs capable of uniquely identifying R-UE between eNB and RN are adopted as identifiers, the identifier IDs occupy 8 bits, the RN IDs also occupy 8 bits, and the subheader format is as shown in fig. 10 or fig. 11.

Meanwhile, since the length of the encapsulated R-MAC PDU does not reach the corresponding specified length, the payload in the R-MAC PDU is filled with the byte number of the corresponding stuff byte at the last, and an R/R/E/LCID subheader for indicating the stuff byte is added at the last of the corresponding header part, wherein the format of the subheader is shown in FIG. 5.

Example 3:

and the eNB packages 6 MAC SDUs belonging to 2R-UEs and 3 items of R-MAC CE information under the RN into one R-MAC PDU to be transmitted to the RN on a relay link, wherein the two R-UEs are respectively represented as R-UE1 and R-UE 2, the three R-MAC CEs are respectively represented as R-MAC CE1 to R-MAC CE 3, the number of the MAC SDUs belonging to the R-UE1 is 2, and the number of the MAC SDUs belonging to the R-UE 2 is 4.

In the header part of the R-MAC PDU, sequentially encapsulating:

2S subheads respectively corresponding to R-UE1 and R-UE 2, wherein the S subhead of the R-UE1 is in front, which indicates that the R-UE1 contains 2 MAC SDU subheads in the R-MAC PDU head and indicates the UE ID of the R-UE; this is followed by an S subheader corresponding to R-UE 2, indicating the UE ID of R-UE 2 and containing 4 MAC SDU subheaders in the R-MAC PDU header. Wherein, the C-RNTI of the corresponding R-UE is adopted as the ID identification of the UE, and the format of the subheader is shown in figure 13.

6R/R/E/LCID/F/L subheaders corresponding to MAC SDUs corresponding to all MAC SDUs of the payload parts R-UE1 and R-UE 2, respectively, the subheader format is as shown in FIG. 3 or FIG. 4. Wherein, according to the order of the S subheaders, 2 subheaders of the MAC SDU corresponding to R-UE1 are preceded by 4 subheaders of the MAC SDU corresponding to R-UE 2.

And the packaging sequence of the R-MAC CE and the MAC SDU in the effective load of the R-MAC PDU corresponds to the sequence of each corresponding subheader in the header of the R-MAC PDU one by one. MAC SDUs belonging to the same node are sequentially adjacent.

Example 4:

the RN packages 6 MAC SDUs of the following 2R-UEs and 2 items of R-MAC CE information into one R-MAC PDU to be transmitted to the eNB on a relay link, the two R-UEs are respectively represented as R-UE1 and R-UE 2, the two R-MA CEs are respectively represented as R-MAC CE1 and R-MAC CE 2, wherein the number of the MAC SDUs belonging to the R-UE1 is 3, and the number of the MAC SDUs belonging to the R-UE 2 is 3.

In the header part of the R-MAC PDU, sequentially encapsulating:

2R/R/E/LCID subheaders corresponding to R-MAC CE, R-MAC CE1 and R-MAC CE 2 corresponding to the payload part, respectively, the subheader format is shown in FIG. 5.

2S subheads respectively corresponding to R-UE1 and R-UE 2, wherein the S subhead of the R-UE1 is in front, which indicates that the R-UE1 contains 3 MAC SDU subheads in the R-MAC PDU head and indicates the UE ID of the R-UE; this is followed by an S subheader corresponding to R-UE 2, indicating the UE ID of R-UE 2 and containing 3 MAC SDU subheaders in this R-MAC PDU header. Wherein, other UE IDs capable of uniquely identifying R-UE between eNB and RN are adopted as identifiers, and the format of subheader is shown in fig. 14.

6R/R/E/LCID/F/L subheaders corresponding to MAC SDUs corresponding to all MAC SDUs of the payload parts R-UE1 and R-UE 2, respectively, the subheader format is as shown in FIG. 3 or FIG. 4. Wherein, according to the order of the S subheaders, 3 subheaders of the MAC SDU corresponding to R-UE1 are preceded and followed by 3 subheaders of the MAC SDU corresponding to R-UE 2.

And the encapsulation sequence of the MAC CE and the MAC SDU in the effective load of the R-MAC PDU corresponds to the sequence of each corresponding subheader in the head of the R-MAC PDU one by one. MAC SDUs belonging to the same node are sequentially adjacent.

Example 5:

the eNB packages 4 MAC SDUs belonging to 2R-UE under the RN, 2 MAC SDUs belonging to the RN and 3 items of R-MAC CE information into one R-MAC PDU to be transmitted to the RN on a relay link, wherein the two R-UE are respectively represented as R-UE1 and R-UE 2, the three R-MAC CEs are respectively represented as R-MAC CE1 to R-MAC CE 3, the number of the MAC SDUs belonging to the R-UE1 is 1, the number of the MAC SDUs belonging to the R-UE 2 is 3, and the R-MAC PDU is obtained according to the third R-MAC PDU scheme provided by the invention, as shown in FIG. 26.

In the header part of the R-MAC PDU, sequentially encapsulating:

6R/D/E/LCID/F/L or R/D/E/LCID/F/L/Node ID subheaders corresponding to the MAC SDUs correspond to all the MAC SDUs of the payload parts R-UE1, R-UE 2 and RN, respectively.

Wherein, 1 sub-head of MAC SDU corresponding to R-UE1 is in front, the sub-head of MAC SDU of R-UE1 is indicated to adopt R/D/E/LCID/F/L/Node ID format, wherein, D indicating bit value is 1, the sub-head is indicated to contain Node ID information, and the Node ID area indicates corresponding R-UE ID.

And then 2 subheads of the MAC PDU corresponding to the RN are arranged, the first subhead indicating the MAC SDU belonging to the RN adopts an R/D/E/LCID/F/L/Node ID format, wherein the D indicating bit takes the value of 1, the subhead is indicated to contain Node ID information, and a Node ID area indicates the ID information of the RN. And the subsequent other indication corresponds to the sub-head of the MAC SDU of the RN, which adopts an R/D/E/LCID/F/L format, wherein the D indication bit takes a value of 0, and the node to which the MAC SDU corresponding to the sub-head belongs is the same as the node indicated by the previous sub-head.

Next, 3 sub-heads of the MAC SDU corresponding to the R-UE 2 are carried out, the first sub-head of the MAC SDU indicating the R-UE 2 adopts an R/D/E/LCID/F/L/Node ID format, wherein, the value of a D indicating bit is 1, the sub-head is indicated to contain Node ID information, and a Node ID area indicates a corresponding R-UE ID. And the following 2 sub-heads of the MAC SDU indicating the R-UE 2 adopt an R/D/E/LCID/F/L format, wherein the D indicating bit takes a value of 0, and the node to which the MAC SDU corresponding to the sub-head belongs is the same as the node indicated by the previous sub-head.

C-RNTI is used as UE ID identification in the subheader containing UE ID information of corresponding R-UE, and occupies 16 bits, and the format of the subheader is shown in figure 16 or figure 17.

Example 6:

the RN packages 6 MAC SDUs of the subordinate 2R-UEs and 1 item of R-MAC CE information into one R-MAC SDU which is transmitted to the eNB on a relay link, the two R-UEs are respectively represented as R-UE1 and R-UE 2, wherein the number of the MAC SDUs belonging to the R-UE1 is 3, and the number of the MAC SDUs belonging to the R-UE 2 is 3.

In the header part of the R-MAC PDU, sequentially encapsulating:

1R/R/E/LCID subheader corresponding to R-MAC CE, respectively corresponding to R-MAC CE1 of the payload part, the subheader format is shown in FIG. 5.

6R/D/E/LCID/F/L or R/D/E/LCID/F/L/Node ID subheaders corresponding to the MAC SDUs correspond to all the MAC SDUs of the payload parts R-UE1 and R-UE 2, respectively.

The method comprises the steps that 3 sub-heads of MAC SDUs corresponding to R-UE1 are in front, the first sub-head of the MAC SDU indicating the R-UE1 adopts an R/D/E/LCID/F/L/Node ID format, the D indicating bit value is 1, UE ID information is contained in the sub-head, the other 2 sub-heads of the MAC SDU indicating the R-UE1 adopt an R/D/E/LCID/F/L format, the D indicating bit value is 0, and the Node to which the MAC SDU corresponding to the sub-head belongs is the same as the Node indicated by the previous sub-head.

Next, 3 sub-headers of the MAC SDU corresponding to the R-UE 2 are followed, the first sub-header indicating the MAC SDU of the R-UE 2 adopts an R/D/E/LCID/F/L/Node ID format, where a D indicating bit takes a value of 1 to indicate that the sub-header contains UE ID information, and the next 2 sub-headers indicating the MAC SDU of the R-UE 2 adopts an R/D/E/LCID/F/L format, where a D indicating bit takes a value of 0 to indicate that a Node to which the MAC SDU corresponding to the sub-header belongs is the same as that indicated by the previous sub-header.

Other UE IDs capable of uniquely identifying the R-UE between the eNB and the RN are adopted as identifications in the subheader containing the UE ID information of the corresponding R-UE, and the format of the subheader is shown in figure 18 or figure 19.

The embodiment of the device is as follows:

as shown in fig. 28, a transmission apparatus for a relay link, the apparatus comprising: the device comprises an indication information generating unit, a packaging unit and a transmission unit. The indication information generating unit is used for generating node indication information of a node to which the MAC SDU encapsulated in the effective load belongs, transmitting the node indication information to the encapsulating unit and encapsulating the node indication information in an R-MAC PDU header. The packaging unit is used for packaging the R-MAC CE to be transmitted between the eNB and the RN and the MAC SDU belonging to each node in the effective load of the R-MAC PDU; encapsulating the node indication information in the R-MACPDU header; and delivers the R-MAC PDU to the transmission unit. And a transmission unit, configured to transmit the R-MAC PDU on a backhaul link between the eNB and the RN.

Here, the encapsulating unit is further configured to encapsulate at least: k R-MAC CEs; m R-MAC SDUs; n U-MAC SDUs, wherein m is more than or equal to 0, k and n is more than or equal to 1.

Here, the encapsulating unit is further configured to further encapsulate a stuff byte in a payload of one R-MAC PDU, where the stuff byte is located at the end of the payload portion.

Since the adopted node indication information is different, the specific implementation of the indication information generation unit in the device is different, and is set forth below respectively.

The first implementation is as follows: and the indication information generating unit is further used for containing the Node ID of the corresponding Node in the subheader of the indication MAC SDU as the Node indication information.

At this time, the subheader of one MAC SDU correspondingly indicates one MAC SDU; the R-MAC PDU header also comprises: a subheader indicating the R-MAC CE, and optionally a subheader indicating the stuff bytes.

Here, the indication information generating unit is further configured to use a format of the subheader of the MAC SDU specifically as follows: R/R/E/LCID/F/L/Node ID; the format of the sub-header of the R-MAC CE or the sub-header of the stuffing byte is specifically as follows: R/R/E/LCID. Wherein,

when the current MAC SDU subhead corresponds to the indication R-MAC SDU, a Node ID indication bit is adopted in the current MAC SDU subhead to specifically indicate the RN ID; and when the current MAC SDU subhead corresponds to the indication U-MAC SDU, specifically indicating the R-UE ID by adopting a Node ID indication bit in the current MAC SDU subhead.

The second implementation is as follows: and the indication information generating unit is further used for adopting the S subheader in the R-MAC PDU header as the node indication information.

At this time, one S subheader indicates one or more MAC SDUs belonging to the same node; the R-MAC PDU header also comprises: a subheader indicating R-MAC CE, a subheader indicating MAC SDU, and optionally a subheader indicating padding bytes.

Here, the indication information generating unit is further configured to specify a format of the S subheader as the Node indication information as R/E/SDU number/Node ID; the adopted MAC SDU sub-header format specifically comprises the following steps: R/R/E/LCID/F/L; the adopted format of the R-MAC CE sub-header or the padding byte sub-header is specifically as follows: R/R/E/LCID.

Wherein, in the subheader of the current R-MAC CE, the E indicating bit specifically indicates: the current R-MAC CE subheader is followed by another R-MAC CE subheader or an S subheader; in the current S subheader, the E indication bit specifically indicates: the next S subhead or the MAC SDU subhead follows the current S subhead; in other types of current subheaders besides the R-MAC CE subheader and the S subheader, the E indicating bit specifically indicates: the current subheader is followed by another subheader, or the start of the payload.

Here, the indication information generating unit is further configured to, in the current S subheader, specifically indicate with SDU No.: the number of MAC SDU sub-heads belonging to the node corresponding to the current S sub-head.

Here, the indication information generating unit is further configured to specifically indicate, in the current S subheader, with the Node ID: node identification information of the corresponding node; when the corresponding Node is RN, the Node ID is RN ID, and when the corresponding Node is R-UE, the Node ID is R-UE ID.

The third concrete implementation: and an indication information generating unit, further configured to include the D indication bit, or the D indication bit and the Node ID in a subheader of the MAC SDU as the Node indication information.

At this time, the MAC SDU sub-head comprises a D indicating bit which indicates whether the MAC SDU corresponding to the current sub-head and the MAC SDU corresponding to the previous sub-head belong to the same node; the R-MAC PDU header also comprises: a subheader indicating the R-MAC CE, and optionally a subheader indicating the stuff bytes.

Here, the indication information generating unit is further configured to use a format of a subheader of the MAC SDU including the node indication information to be specifically: R/D/E/LCID/F/L or R/D/E/LCID/F/L/Node ID; the adopted format of the R-MAC CE sub-header or the padding byte sub-header is specifically as follows: R/R/E/LCID.

In the current MAC SDU subhead, when the D indicating bit indicates that the MAC SDU corresponding to the indication of the current MAC SDU subhead and the MAC SDU corresponding to the indication of the previous subhead do not belong to the same Node, the format adopted by the current subhead is specifically R/D/E/LCID/F/L/Node ID. Wherein, the Node ID specifically indicates: node identification information of the corresponding node; when the corresponding Node is RN, the Node ID is RN ID, and when the corresponding Node is R-UE, the Node ID is R-UE ID.

In the current MAC SDU subhead, when the D indicating bit indicates that the MAC SDU corresponding to the indication of the current MAC SDU subhead and the MAC SDU corresponding to the indication of the previous subhead belong to the same node, the format adopted by the current subhead is specifically R/D/E/LCID/F/L.

The embodiment of the device is as follows:

as shown in fig. 29, a receiving apparatus for a relay link, the apparatus comprising: an indication information analysis unit and a decapsulation unit. The device comprises an indication information analysis unit, a decapsulation unit and a message sending unit, wherein the indication information analysis unit is used for obtaining node indication information analysis from the encapsulation of an R-MAC PDU header and transmitting an analysis result to the decapsulation unit; the node indication information is node indication information of a node to which the MAC SDU encapsulated in the R-MAC PDU payload belongs. A decapsulation unit, configured to decapsulate, in an R-MAC PDU payload, an R-MAC CE to be transmitted between the eNB and the RN and MAC SDUs belonging to each node according to an analysis result; the R-MAC CE and the MAC SDUs belonging to each node in the payload are obtained.

Here, the decapsulating unit is further configured to parse out information encapsulated in a payload of an R-MAC PDU, and includes at least: k R-MAC CEs; m R-MAC SDUs; n U-MAC SDUs, wherein m is more than or equal to 0, k and n is more than or equal to 1.

Here, the decapsulating unit is further configured to parse padding bytes from a payload of an R-MAC PDU; the stuff bytes are located at the end of the payload section.

Because the adopted node indication information is different, the specific implementation of the indication information analysis unit and the decapsulation unit in the device is different, and the following description is provided respectively.

The first implementation is as follows: the indication information analysis unit is further used for analyzing that the node indication information is: node ID indicating the corresponding Node contained in the subheader of the MAC SDU.

The format of the MAC SDU sub-header specifically comprises the following steps: under the condition of R/R/E/LCID/F/L/Node ID, here, the indication information analysis unit obtains the Node ID of the Node to which the corresponding MAC SDU belongs from the sub-head of the MAC SDU; the indication information analyzing unit is further used for analyzing the Node ID specific indication: if the corresponding Node is RN, the Node ID is RN ID; or, the indication information parsing unit is further configured to specifically indicate, by the Node ID: if the corresponding Node is R-UE, the Node ID is R-UE ID.

Here, the indication information analysis unit further transmits the node indication information obtained by the analysis to the decapsulation unit.

Here, the decapsulating unit further decapsulates one or more MAC SDUs included in the payload, based on the Node ID information for the Node to which each MAC SDU belongs, which is obtained from the instruction information parsing unit.

The second implementation is as follows: the indication information analysis unit is further used for analyzing that the node indication information is: an S subheader included in an R-MAC PDU header; wherein one S subheader indicates one or more MAC SDU subheaders belonging to the same node.

In the case that the format of the S subheader is specifically R/E/SDU number/Node ID, here, the indication information parsing unit is further configured to parse out the E indication bit specific indication: the current S subheader is followed by another S subheader, or MAC SDU subheader.

Here, the indication information parsing unit is further configured to parse out an SDU No. specific indication: the number of MAC SDU sub-heads belonging to the node corresponding to the current S sub-head.

Here, the indication information parsing unit is further configured to parse out the Node ID specific indication: if the corresponding Node is RN, the Node ID is RN ID; or, the indication information parsing unit is further configured to specifically indicate, by the Node ID: if the corresponding Node is R-UE, the Node ID is R-UE ID.

Here, the instruction information analyzing unit further transfers the node instruction information obtained by the analysis to the decapsulating unit.

Here, the decapsulating unit decapsulates one or more MAC SDUs included in the payload, based on the number of MAC SDUs belonging to the same Node and Node ID information of the Node to which the MAC SDUs belong, which are obtained from the instruction information parsing unit.

The third concrete implementation: the indication information analysis unit is further used for analyzing that the node indication information is: d indication bits contained in the subheader of the MAC SDU, or D indication bits and Node ID.

Here, the indication information parsing unit is further configured to parse out the D-indicating bit indication: if the MAC SDU indicated by the current MAC SDU subheader does not belong to the same node as the MAC SDU indicated by the previous subheader, the format of the current MAC SDU subheader is specifically: R/D/E/LCID/F/L/Node ID. The indication information analyzing unit is further used for analyzing the Node ID specific indication: if the corresponding Node is RN, the Node ID is RN ID; or, the indication information parsing unit is further configured to specifically indicate, by the Node ID: if the corresponding Node is R-UE, the Node ID is R-UE ID.

The indication information analysis unit is further used for analyzing the D indication information: the MAC SDU indicated by the current MAC SDU subheader and the MAC SDU indicated by the previous subheader belong to the same node, and the format of the current MAC SDU subheader is specifically as follows: R/D/E/LCID/F/L.

Here, the decapsulating unit further decapsulates one or more MAC SDUs included in the payload, based on the Node ID information and whether or not the Node to which the MAC SDU belongs is the same as the previous MAC SDU, which is obtained from the instruction information parsing unit.

The relays referred to above are denoted Relay; the Backhaul Link is denoted by Backhaul Link; the Access Link is represented by Access Link; the MAC PDU Header is expressed by a MAC PDU Header; sub-heads are denoted as subheads; the MAC PDU Payload is expressed in MAC PDU Payload; the MAC PDU Subheader is expressed by MAC PDU Subheader; padding bytes are denoted Padding; R-MAC PDU is expressed as Relay-MAC PDU; R-MAC CE is expressed as Relay MAC CE; the Buffer Status Report is expressed by a Buffer Status Report R-MAC control element; the discontinuous transmission configuration indication is expressed by DRXCommand R-MAC Control Element; the time advance adjustment indication is expressed by Timing advanced command R-MAC Control Element; the Power Control indication is expressed in a Power HeadroomR-MAC Control Element; the S subheader is denoted by SDU Number indication header, abbreviated as S-header.

The above description is only a preferred embodiment of the present invention, and is not intended to limit the scope of the present invention.

Claims

1. A transmission method for a relay link, the method comprising: in the effective load of a relay media access control protocol data unit (R-MAC PDU), after a relay MAC control element (R-MAC CE) to be transmitted between an enhanced base station (eNB) and a relay station (RN) and an MAC service data unit (MAC SDU) belonging to each node are packaged, the R-MAC PDU is transmitted on a return link between the eNB and the RN;

respectively indicating each node to which the MAC SDU packaged in the effective load belongs through node indication information packaged in an R-MAC PDU header, wherein the node comprises an RN and an RN subordinate user terminal (R-UE);

the node comprises at least one R-UE;

and respectively indicating each node to which the MAC SDU packaged in the effective load belongs through node indication information packaged in an R-MAC PDU head, specifically indicating the R-MAC SDU belonging to the RN node and the U-MAC SDU belonging to the R-UE node by differentiating the node indication information.

2. The method of claim 1, wherein the R-MAC CE is a MAC control element related to the RN;

3. The method of claim 1, wherein the Node indication information specifically indicates a Node identification (Node ID) of a Node to which each MAC SDU belongs.

4. The method of claim 2, wherein at least one R-MAC PDU payload is encapsulated with: k R-MAC CEs; m R-MAC SDUs; n U-MAC SDUs, wherein m is more than or equal to 0, k and n is more than or equal to 1.

5. The method of claim 4 wherein a R-MAC PDU payload is further encapsulated with stuff bytes, the stuff bytes being located at the end of the payload portion.

6. The method according to claim 1, wherein the node indication information is specifically: the R-MAC PDU head comprises a sub-head indicating MAC SDU; one MAC SDU sub-head correspondingly indicates one MAC SDU, and the MAC SDU sub-head comprises the NodeID of the indicated node to which the MAC SDU belongs;

7. The method of claim 6, wherein the format of the MAC SDU subheader specifically is: R/R/E/LCID/F/L/Node ID; the format of the subheader of the R-MAC CE or the subheader of the padding bytes is specifically: R/R/E/LCID; wherein,

8. The method according to claim 1, wherein the node indication information is specifically: the R-MAC PDU head comprises an S subhead; one S subhead indicates one or more subheads corresponding to one or more MAC SDUs belonging to the same node;

9. The method of claim 8 wherein the S subheader further provides a unified indication of the number of subheaders corresponding to one or more MAC SDUs belonging to the same Node and corresponding Node IDs contained in the R-MAC PDU header.

10. The method according to claim 9, wherein the Node ID of the Node to which the one or more subheaders indicating the MAC SDU belongs is determined according to the encapsulation order of the one or more S subheaders included in the header of the R-MAC PDU and the indication of each S subheader; wherein, the subheads corresponding to the MAC SDU belonging to the same node are adjacent in sequence; and the MAC SDU sub-heads corresponding to different nodes are in one-to-one correspondence with the corresponding S sub-head sequences.

11. The method of claim 9, wherein the encapsulation order of the content included in the payload corresponds to the encapsulation order of the corresponding subheader one to one; wherein,

12. The method of claim 9, wherein the format of the S subheader is specifically R/E/SDU number/Node ID; the format of the subheader of the MAC SDU specifically is: R/R/E/LCID/F/L; the format of the R-MAC CE sub-header or the stuffing byte sub-header is specifically as follows: R/R/E/LCID; wherein,

13. The method of claim 12, wherein in the current S subheader, sduno. The number of MAC SDU sub-heads belonging to the node corresponding to the current S sub-head.

14. The method of claim 12, wherein when the indication Node corresponding to the current S subheader is RN, the Node ID specifically indicates RN ID in the current S subheader;

15. The method according to claim 1, wherein the node indication information is specifically: the R-MAC PDU head comprises a subhead indicating MAC SDU; one MAC SDU sub-head correspondingly indicates one MAC SDU, and the D indicating bit is adopted in the MAC SDU sub-head to indicate whether the MAC SDU corresponding to the current sub-head and the MAC SDU corresponding to the previous sub-head belong to the same node or not;

16. The method of claim 15, wherein the format of the MAC SDU subheader specifically is: R/D/E/LCID/F/L or R/D/E/LCID/F/L/Node ID; the format of the R-MAC CE sub-header or the stuffing byte sub-header is specifically as follows: R/R/E/LCID; wherein,

17. The method of claim 16, wherein the format adopted by the sub-header of the MAC SDU is specifically R/D/E/LCID/F/L/Node ID, and when the sub-header of the current MAC SDU corresponds to the indication R-MAC SDU, the Node ID specifically indicates the RN ID;

18. The method of claim 15, wherein the R-MAC PDU header comprises one or more MAC SDU subheaders corresponding to indications belonging to the same node, which are sequentially adjacent in sequence;

19. The method according to claim 6 or 15, wherein the encapsulation order of the contents included in one R-MAC PDU payload corresponds one-to-one to the encapsulation order of the corresponding subheader; wherein,

20. The method according to claim 7, or 14, or 17, wherein the R-UE ID specifically comprises: a cell radio network temporary identity (C-RNTI) of the R-UE, and other identification information uniquely identifying one R-UE between the eNB and the RN.

21. A transmission apparatus for a relay link, the apparatus comprising: an indication information generation unit, a packaging unit, and a transmission unit; wherein,

the indication information generating unit is used for generating node indication information of the node to which the MAC SDU packaged in the effective load belongs, transmitting the node indication information to the packaging unit and packaging the node indication information in an R-MAC PDU head; the node indication information is used for indicating R-MAC SDU belonging to the RN node and U-MAC SDU belonging to the R-UE node in a distinguishing way;

22. The apparatus of claim 21, wherein the encapsulating unit is further configured to encapsulate at least one of: k R-MAC CEs; m R-MACSDUs; n U-MAC SDUs, wherein m is more than or equal to 0, k and n is more than or equal to 1.

23. The apparatus of claim 22, wherein the encapsulating unit is further configured to further encapsulate padding bytes in a payload of the R-MAC PDU, and wherein the padding bytes are located at the end of the payload portion.

24. The apparatus of claim 21, wherein the indication information generating unit is further configured to include a Node ID of a corresponding Node in a subheader of the indication MAC SDU as the Node indication information.

25. The apparatus according to claim 24, wherein the indication information generating unit is further configured to use a MAC SDU subheader format specifically as follows: R/R/E/LCID/F/L/Node ID; wherein,

26. The apparatus of claim 21, wherein the indication information generating unit is further configured to use an S subheader in a header of an R-MAC PDU as the node indication information;

27. The apparatus according to claim 26, wherein the indication information generating unit is further configured to use a format of an S subheader as the Node indication information, specifically, R/E/SDU number/Node ID;

28. The apparatus of claim 21, wherein the indication information generating unit is further configured to include a D indication bit or a D indication bit and a Node ID in a subheader of the MAC SDU as the Node indication information.

29. The apparatus according to claim 28, wherein the indication information generating unit is further configured to specify a format of the MAC SDU subheader including the node indication information as: R/D/E/LCID/F/L or R/D/E/LCID/F/L/Node ID; wherein,

30. A receiving apparatus for a relay link, the apparatus comprising: an indication information analysis unit and a decapsulation unit; wherein,

the indication information analysis unit is used for analyzing the node indication information encapsulated in the R-MAC PDU head and transmitting the analysis result to the decapsulation unit; the node indication information is node indication information of a node to which MAC SDU packaged in an effective load of the R-MAC PDU belongs, and is used for indicating the R-MAC SDU belonging to the RN node and the U-MAC SDU belonging to the R-UE node in a distinguishing manner;

31. The apparatus of claim 30, wherein the decapsulating unit is further configured to parse out information encapsulated in a payload of an R-MAC PDU, and comprises: k R-MACCEs; m R-MAC SDUs; n U-MAC SDUs, wherein m is more than or equal to 0, k and n is more than or equal to 1.

32. The apparatus of claim 31, wherein the decapsulating unit is further configured to parse a payload of an R-MAC PDU to further extract padding bytes; the stuff bytes are located at the end of the payload section.

33. The apparatus of claim 30, wherein the indication information parsing unit is further configured to parse out node indication information as: and Node ID of the corresponding Node contained in the subheader of the indication MAC SDU.

34. The apparatus of claim 33, wherein the format of the MAC SDU subheader is specifically: R/R/E/LCID/F/L/Node ID;

35. The apparatus of claim 30, wherein the indication information parsing unit is further configured to parse out node indication information as: an S subheader included in an R-MAC PDU header; wherein one S subheader indicates one or more MAC SDU subheaders belonging to the same node.

36. The apparatus of claim 35 wherein the format of the S subheader is specifically R/E/SDU number/Node ID;

37. The apparatus of claim 30, wherein the indication information parsing unit is further configured to parse out node indication information as: and D indicating bits or D indicating bits and Node IDs contained in the subheaders of the MAC SDUs.

38. The apparatus of claim 37, wherein the indication information parsing unit is further configured to parse out a D-indicator bit indication: the MAC SDU corresponding to the current MAC SDU sub-head and the MAC SDU corresponding to the previous sub-head do not belong to the same node; the format of the current MAC SDU sub-header is specifically: R/D/E/LCID/F/L/Node ID;

39. The apparatus of claim 38, wherein a format of the mac sdu subheader containing the node indication information is specifically: under the condition of R/D/E/LCID/F/L/Node ID, the indication information analysis unit is further used for analyzing the specific indication of the Node ID: the RN ID of the corresponding node; or, the indication information parsing unit is further configured to parse out the Node ID specific indication: R-UE ID.