CN101170342B - Radio relay system and method for realizing downlink data transmission and relay base station - Google Patents

Abstract

The invention discloses a wireless relay system and its method for realizing downlink data transmission and a relay base station. By sending a current information position mark to a mobile terminal MS before switching, the current information position mark fed back by the MS is used after the handover is completed. The indicated position continues to send downlink data to the MS, which ensures the continuity of downlink data transmission when the relay system needs to be switched and there is still downlink data transmission in the downlink.

Description

Wireless relay system, method for realizing downlink data transmission and relay base station

technical field

The invention relates to data transmission technology in mobile communication, in particular to a wireless relay system, a method for realizing downlink data transmission of the wireless relay system and a relay base station. the

Background technique

It is well known that the higher the frequency of radio waves, the faster they attenuate with distance. This characteristic of radio waves has led to a very limited coverage of mobile communication base stations operating in high frequency bands. Therefore, the appearance of the wireless relay system effectively solves this problem. In a wireless relay system, a relay base station (RS) communicates with a BS through an air interface and forwards data from a terminal. Under the same system performance requirements, such as system coverage and throughput, the complexity and cost of building and maintaining RS are much smaller than traditional BS, and can be quickly laid. Therefore, using RS, the performance of the wireless system can be greatly improved at a lower cost. the

Figure 1 is a schematic diagram of the topology of the wireless relay system, in Figure 1:

The solid line represents the single-user data link, and the dotted line represents the broadcast message link;

A base station supporting mobile multi-hop relay (MMR-BS) is a base station capable of supporting a relay base station;

RS1, RS2 and RS3 are high-capacity relay base stations, which can send synchronization headers and resource allocation broadcast messages independently, and have resource allocation capabilities;

rs1, rs2, and rs3 are low-capability relay base stations, which cannot send synchronization headers and resource allocation broadcast messages independently, and do not have resource allocation capabilities;

MS1, MS2, MS3 and MS4 are mobile terminals;

The synchronization station of MS1 is RS1, and the access station is rs1; the synchronization station and access station of MS4 are both RS3; the synchronization station of rs3 is MMR-BS, and the access station is rs2; the synchronization station and access station of RS3 are both RS2. the

The MS or RS keeps synchronization with the synchronization station and reads broadcast messages from the synchronization station. A synchronization station can be a BS, an MMR-BS or a high-capability RS. The access station is a station that directly provides a network access point to the RS or MS, and the access station can be a BS, MMR-BS or RS.

In the relay system, when the MS or RS is handed over, there is still data transmission in the downlink of the MS or RS, so it is necessary to ensure that the data received by the MS or RS before and after the handover is continuous, without packet loss and without repeated packets. However, there is no solution to the above problems in the existing wireless relay system downlink data transmission technology. the

Contents of the invention

In view of this, the main purpose of the present invention is to provide a method for realizing downlink data transmission in a wireless relay system. the

Another object of the present invention is to provide a wireless relay system. the

Another object of the present invention is to provide a relay base station. the

In order to achieve the above object, technical solution of the present invention is achieved in that way:

The invention discloses a method for realizing downlink data transmission in a wireless relay system, the method comprising the following steps:

A. Before the handover node performs the handover, the downlink transmission control node sends the current information position mark to the mobile terminal (MS) before the handover;

B. After the handover node completes the handover, when the handover node is a relay base station (RS) capable of sending synchronization headers and resource allocation broadcast messages independently and capable of resource allocation, and there are more than one MS served by the handover node When handover is performed simultaneously with the handover node, each MS first sends its own current information position mark to the handover node, and then the handover node combines the received current information position marks to generate a new The message is sent to the downlink transmission control node after switching;

C. The downlink transmission control node continues to send downlink data to the MS according to the position indicated by the current information position mark after the handover. the

In the above method, the downlink transmission control node before the handover is a base station (MMR-BS) that supports mobile multi-hop relay or an RS that can send a synchronization header and a resource allocation broadcast message separately, and has resource allocation capabilities; the handover The subsequent downlink transmission control node is an MMR-BS or an RS capable of sending a synchronization header and a resource allocation broadcast message independently and capable of resource allocation. the

In the above method, when there is more than one RS in the link between the pre-handover downlink transmission control node and the MS, the method of sending the current information position mark in step A is: the pre-handover downlink transmission control node The node transparently transmits the current information position marker step by step through the RS in the link until it reaches the MS. the

In the above method, when there is more than one RS in the link between the handover node and the post-handover downlink transmission control node, in step B, the handover node sends the new message generated by the merge process to the handover The method for the subsequent downlink transmission control node is: the switching node transparently transmits the new message generated through the merge process step by step through the RS in the link until it reaches the post-switching downlink transmission control node; The data method is as follows: after the switching, the downlink transmission control node transparently transmits the downlink data step by step through the RS in the link until it reaches the switching node, and then the switching node sends the downlink data to the Said MS. . the

The above method, before each RS in the link transparently transmits the new message generated through the combination process, further includes: the synchronization station of the RS allocates bandwidth for sending the uplink message to the RS. the

The method for the synchronization station to allocate bandwidth for the RS is: the synchronization station of the RS allocates bandwidth for sending uplink messages to the RS in an uplink resource allocation broadcast message sent to the RS. the

The above method, before the step B, further includes: the synchronization station of the MS allocates bandwidth for sending uplink messages to the MS. the

The method for the synchronization station to allocate bandwidth to the MS is: the synchronization station of the MS allocates bandwidth for sending uplink messages to the MS in an uplink resource allocation broadcast message sent to the MS. the

In the above-mentioned method, the current information position described in the step A is marked as: the SDU SN extended subheader containing the service data unit serial number SDU SN; the current information position described in the step B is marked as: the SN report MAC header comprising the SDU SN. the

The above method, in the step A, further includes: the MS updates and calculates the current information position mark sent by the downlink transmission control node before the handover; in the step B, the MS updates and calculates the The current information location marker of is sent to the switching node. the

The invention discloses a wireless relay system, which includes:

The switching node, before switching, receives the current information position mark sent by the downlink transmission control node before switching; after the handover is completed, receives the current information position mark sent by more than one mobile terminal (MS) served by the switching node and performs Combine processing, generate a new message, send the new message to the downlink transmission control node after the switch, and receive the downlink data sent by the downlink transmission control node after the switch; the switch node is capable of sending the synchronization header and A relay base station (RS) that broadcasts a resource allocation message, has resource allocation capabilities, and more than one MS served by the handover node follows the handover node and performs handover at the same time;

The pre-handover downlink transmission control node is used to control the downlink transmission node in the pre-handover link of the handover node, and send the current information location mark to the handover node before the handover node performs handover;

The post-handover downlink transmission control node is used to control the downlink transmission node in the post-switching link of the switching node. After the switching node completes the switching, it receives the current information position mark sent by the switching node, and according to the The position indicated by the current information position mark continues to send downlink data to the switching node. the

In the above system, the downlink transmission control node before the handover is a base station (MMR-BS) supporting mobile multi-hop relay or an RS capable of sending synchronization headers and resource allocation broadcast messages independently and capable of resource allocation; after the handover The downlink transmission control node is an MMR-BS or an RS capable of sending synchronization headers and resource allocation broadcast messages independently, and capable of resource allocation. the

The above system, in the link between the downlink transmission control node before switching and the switching node, further includes more than one RS, which is used to mark the current information position sent by the downlink transmission control node before switching transparently passed to the switching node. the

The above system, in the link between the downlink transmission control node after the handover and the handover node, further includes more than one RS, which is used to transparently transmit the current information position mark sent by the handover node to the handover node step by step. The switched downlink transmission control node transparently transmits the downlink data sent by the switched downlink transmission control node to the switching node step by step. the

The present invention also discloses a relay base station (RS). When more than one mobile terminal (MS) served by the RS follows the RS and switches simultaneously, the RS realizes the following functions:

Before the RS performs the handover, it forwards the current information location mark sent by the downlink transmission control node before the handover to the MS served by the RS;

After the RS completes the handover, it receives the current information location marker sent by the MS served by the RS, and combines the received current information location markers to generate a new message, and then sends it to the post-handover downlink transmission control node. the

The RS includes at least the following units:

The downlink forwarding control unit is used to forward the current information position mark sent by the downlink transmission control node before the handover to the MS served by the RS;

A merge processing unit, configured to receive the current information position mark sent by the MS served by the RS, and perform merge processing to generate a new message;

The uplink forwarding control unit is configured to send the new message generated by the merging processing unit to the downlink transmission control node after switching. the

Therefore, a wireless relay switching system and a downlink data transmission method in the switching process and a relay base station provided by the present invention have the following advantages: the current information position mark is sequentially forwarded by the RS in the link, and is transmitted by the RS in the link. The scheme of MS assisting in memorizing the current information location mark makes it possible to ensure the continuity of downlink transmission data before and after the handover during the handover process of the wireless relay system. the

Description of drawings

Fig. 1 is a schematic diagram of the topology of the wireless relay system;

Figure 2 is a schematic diagram of a scene when an MS performs inter-cell handover in a wireless relay system;

Figure 3 is a flow chart of downlink data transmission in the scenario shown in Figure 2;

Figure 4 is a schematic diagram of a scene when an MS performs an intra-cell handover in a wireless relay system;

Fig. 5 is a flow chart of downlink data transmission in the scenario shown in Fig. 4;

Fig. 6 is a schematic diagram of the scene when the RS in the wireless relay system and the MS served by the RS perform inter-cell handover as a whole;

FIG. 7 is a flow chart of downlink data transmission in the scenario shown in FIG. 6 . the

Detailed ways

In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below with reference to the accompanying drawings and preferred embodiments. the

Firstly, some technical terms involved in the following description are introduced to make the description clearer. the

Handover node: the node where handover occurs in the relay network, which can be MS or RS;

Handover control node: a node that initiates a handover process to a handover node or responds to a handover request initiated by a handover node, which can be an MMR-BS or a high-capacity RS;

Downlink transmission control node before handover: the node that controls the downlink transmission in the link before handover of the handover node. The cached data is transmitted to the switched downlink transmission control node. The downlink transmission control node before handover may be the same as the handover control node. the

Downlink transmission control node after switching: the node that controls the downlink transmission in the link after the switching node. Send new data. When an intra-cell handover occurs, the downlink transmission control node after the handover is the same as the downlink transmission control node before the handover. the

Figure 2 is a schematic diagram of a scenario where an MS performs inter-cell handover in a wireless relay system. The BS and the handover control node are serving MMR-BSs. The MS is handed over from the cell covered by the serving MMR-BS to the cell covered by the target MMR-BS. And there are high-capacity relay base stations RS1 and RS2 in the links between MS and MMR-BS and MMR-BS in the two cells respectively. the

Here, the range of the cell covered by the MMR-BS refers to the area covered by the MMR-BS and all the RSs it serves. In the scenario shown in FIG. 2 , the serving MMR-BS is different from the target MMR-BS, so the handover shown in FIG. 2 is called an inter-cell handover. The difference between the handover of the relay network and the handover of the non-relay network is that: before or after the handover in the relay network, there is at least one RS in the link between the MS and the MMR-BS, while in the non-relay network before the handover, there is at least one RS After handover, there is no RS in the link between MS and BS. the

Figure 3 is a flow chart of downlink data transmission in the scenario shown in Figure 2. First, the MS initiates a handover request to RS1, and the serving MMR-BS responds to the MS's handover request; or the serving MMR-BS directly initiates handover. If at this time, the serving MMR-BS still has downlink data to send to the MS, in order to ensure the continuity of the downlink data received by the MS before and after handover, perform the steps shown in Figure 3:

Step 301, the serving MMR-BS sends the SDU SN extended subheader to the MS. the

Before the MS communicates with the target access station RS2, the serving MMR-BS sends the current information location mark to the MS at least once, which is used to record the location of the information sent in the current downlink. the

In this embodiment, the current information position mark is the service data unit serial number SDU SN, and the SDUSN is included in the SDU SN extended subheader. The SDU SN extended subheader is included in the protocol data unit (PDU) sent by the serving MMR-BS to the MS, and the SDU SN contained in the SDU SN extended subheader is the sequence number of the last SDU in the PDU currently received by the MS. the

At least one PDU in every 2 ^p PDUs sent by the serving MMR-BS to the MS contains the SDUSN extended subheader. P is specified by the wireless relay system and will not be discussed in detail here.

The MS updates and calculates the received current information location mark. The specific calculation method is: when the MS receives a PDU containing the SDU SN extended sub-header, store the service data unit serial number SDU SN in the SDU SN extended sub-header, When receiving a PDU that does not contain the SDU SN extended sub-header, for each SDU in the PDU, perform the operation of adding one to the sequence number of the service data unit SDU SN, so as to record the sequence number of the currently received data in real time. the

Since there is a high-capacity RS1 between the serving MMR-BS and the MS, the serving MMR-BS first sends the SDU SN extension header containing the current information location mark to RS1, and then transparently transmits it to the MS by RS1. Transparent transmission means that the RS only processes the received message at the physical layer and then forwards it without changing the content of the MAC layer and higher layers of the message. the

Step 302, after the MS completes the handover and re-accesses the relay network, the synchronization station RS2 of the MS sends a UL_MAP to the MS, and in the UL_MAP allocates uplink transmission bandwidth for sending the SN report MAC header to the MS. the

In step 303, the MS sends the SN report MAC header to the synchronization station RS2 in the bandwidth allocated in step 302. the

The MAC header of the SN report contains the current information location mark SDU SN sent by the serving MMR-BS of the transmission control node before the handover and updated and calculated by the MS. the

If there are other low-capability RSs in the link between the MS and its synchronization station, the SN report MAC header is first received by the low-capability RS, and then transparently transmitted to the synchronization station of the MS step by step. In this embodiment, there is no low-capability RS between the MS and its synchronization station RS2, so the MAC header of the SN report is directly received by RS2. the

Step 304, RS2 uploads the SN report MAC header to the target MMR-BS after receiving the SN report MAC header. the

If the synchronization station of the MS is the downlink transmission control node after the handover, there is no need to continue uploading; if there are other high-capacity or low-capability RSs between the MS synchronization station and the downlink transmission control node after the handover, the SN needs to be reported to the MAC The header is transparently transmitted step by step until it reaches the downlink transmission control node after switching. the

In this embodiment, the downlink transmission control node is the target MMR-BS, and there is no RS between the synchronization station RS2 and the target MMR-BS, so RS2 directly sends the SN report MAC header to the target MMR-BS. the

In step 305, the target MMR-BS continues to send downlink data to the MS according to the position displayed by the current information position mark SDU SN in the MAC header of the SN report. the

The target MMR-BS first sends the downlink data to RS2, and RS2 transparently transmits the downlink data to the MS. the

Through the above steps, the continuity of downlink transmission data in the scenario shown in FIG. 2 is guaranteed. the

Figure 4 is a schematic diagram of a scenario where an MS performs an intra-cell handover in a wireless relay system. As shown in Figure 4, the handover node is an MS, and the downlink transmission control nodes before and after handover are both serving/target MMR-BSs and handover control nodes for RS1. In the cell covered by the serving/target MMR-BS, the MS switches from the area covered by RS1 to the area covered by RS2. In this scenario, the serving MMR-BS and the target MMR-BS are the same base station, so it is called intra-cell handover. the

Fig. 5 is a flow chart of downlink data transmission in the scenario shown in Fig. 4. First, MS initiates a handover request to RS1, and RS1 responds to the MS's handover request; or RS1 directly initiates handover. If at this time the switching control node RS1 still has downlink data to send to the MS, then perform the steps shown in Figure 5:

Step 501, the serving/target MMR-BS sends the SDU SN extended subheader to the MS. the

Before the MS communicates with the target access station RS2, the serving/target MMR-BS sends the current information location marker SDU SN to the MS at least once. The SDU SN is included in the SDU SN extended subheader. The MS performs update calculation on the received current message position mark, and the calculation method is the same as that described in step 301. the

Step 502, after the MS completes the handover and re-accesses the wireless relay network, the synchronization station RS2 of the MS sends a UL_MAP to the MS, and allocates uplink transmission bandwidth for sending the SN report MAC header to the MS in the UL_MAP. the

In step 503, the MS sends the SN report MAC header to the synchronization station RS2 in the bandwidth allocated in step 502. the

The SN report MAC header contains the current information position mark SDU SN sent by the serving/target MMR-BS of the downlink transmission control node before the handover and updated and calculated by the MS. the

Step 504, after receiving the SN report MAC header, RS2 uploads the SN report MAC header to the serving/target MMR-BS of the downlink transmission control node after handover. the

Step 505, the serving/target MMR-BS continues to send downlink data to the MS according to the position displayed by the current information position mark SDU SN in the MAC header of the SN report. the

The serving/target MMR-BS first sends the downlink data to RS2, and RS2 transparently transmits the downlink data to the MS. the

In some special cases, the handover node is a high-capability RS, and the RS and the MS served by the RS will move as a whole. In the present invention, the MS served by the handover node RS refers to the MS that accesses the network through the RS and stores downlink data transmission while following the RS while performing handover. For example, the RS and the MS served by the RS are located in mobile places such as trains and ships. the

Figure 6 shows a schematic diagram of the scene when the RS in the wireless relay system and the MSs served by the RS perform inter-cell handover as a whole. The MMR-BS, the downlink transmission control node after handover is the target MMR-BS, and the handover control node is the serving MMR-BS. RSO is handed over from the cell covered by the serving MMR-BS to the cell covered by the target MMR-BS. There is a high-capability RS1 in the link between RSO and the serving MMR-BS, and there is a high-capability RS2 in the link between RSO and the target MMR-BS, and it is assumed that RSO serves two mobile terminals MS1 and MS2. the

Fig. 7 is a flow chart of downlink data transmission in the scenario shown in Fig. 6. First, RS0 initiates a handover request to the serving MMR-BS, and the serving MMR-BS responds to the handover request of RS0; or the serving MMR-BS directly initiates handover. If at this time, the serving MMR-BS still continues to send downlink data to MS1 and MS2, in order to maintain the continuity of the downlink data received by MS1 and MS2 before and after the handover, perform the steps shown in Figure 7:

Step 701, the serving MMR-BS sends the SDU SN extended subheader to MS1 and MS2. the

Before RSO communicates with target access station RS2, the serving MMR-BS sends the current information location marker at least once to MS1 and MS2 served by RSO. the

In this embodiment, the current information location mark is the SDU SN, and the SDU SN is included in the SDU SN extended subheader. The serving MMR-BS first sends the SDU SN extended subheader to RS1, RS1 then transparently transmits it to RS0, and the downlink forwarding control unit of RS0 then downlinks the received SDU SN extended subheader to MS1 and MS2. the

MS1 and MS2 respectively update and calculate the received current information position mark, and the calculation method is the same as that described in step 301 . the

Step 702, the switching node RS0 and MS1 and MS2 served by RS0 complete the relay network switching, and after re-connecting to the relay network, RS0 sends UL_MAP to MS1 and MS2 respectively, and assigns MS1 and MS2 in the UL_MAP to send SN reports Uplink transmission bandwidth of the MAC header. the

In step 703, MS1 and MS2 respectively send the SN report MAC header to the synchronization station RS0 in the bandwidth allocated in step 702. the

The SN report MAC header contains the current information position mark SDU SN sent by the serving MMR-BS of the downlink transmission control node before the handover and updated and calculated by the MS. the

Step 704, the synchronization station RS2 of RS0 sends a UL_MAP to RS0, and allocates bandwidth for sending SN report messages to RS0 in the UL_MAP. the

Step 705 , RS0 combines the SN report MAC headers sent to it by MS1 and MS2 in step 703 , generates an SN report message, and uploads it to RS2 in the bandwidth allocated in step 704 . the

Wherein, it is the merging processing unit of RS0 to merge the SN report MAC headers to generate an SN report message; the uplink forwarding control unit of RS0 is to upload the newly generated SN report message to RS2. the

The combined SN report message includes the number of MSs that follow the handover node RS handover and can feed back the SDUSN, and the connection identifier of each MS; the SN report message also includes the information between each MS that follows the RS handover and the target MMR-BS The number of connections that can feedback the SDU SN, and the current information position mark SDU SN in each connection. the

Table 1 is a specific data format of the SN report message, as shown in Table 1:

grammar size illustrate SN report message() the Indicates that the SN report message starts message type 8 bits It can be any number not used in the 802.16e protocol The number of MS n 4 bits Follow the switching node RS to switch, and transmit control to the post-switching The number of MSs that the node feeds back the SDU SN For(i=0; i<n; i++) the Describe n MSs sequentially { the Start of description for the i-th MS MS Basic Connection Identifier 16 bits The basic connection identifier of the i-th MS Number of connections m 4 bits The i-th one can feed back SDUs between the MS and the target MMR-BS

[0107] the the Number of SN connections For(j=0; j<m; j++) the Describe the m connections in turn { the start of description for the jth connection SDU SN 6 bits The current information location mark of the jth connection can be the lowest bit of the sequence number of the automatic repeat request block, or the SN of the MAC SDU is sorted in ascending order of the service flow identifier } the End of description for the jth connection } the End of description for the i-th MS If(less than byte boundary) the If the number of bits occupied by the above content is not an integer multiple of 8 bits, then perform the following operations { the start stuffing bits padding bits 2, 4 or 6 bits Fill 2, 4 or 6 bits of stuffing bits, so that the number of bits of the entire SN report message is an integer multiple of 8 bits } the end of padding

Table 1. Data format of SN report message

The switching node RS combines the current information position marks sent by multiple MSs to form a new message, and then uploads it to the downlink transmission control node after switching. The technical solution improves the effective utilization rate of the link. the

Step 706, RS2 uploads the received SN report message to the target MMR-BS. the

Step 707, the target MMR-BS marks the SDU SN according to the current information positions of MS1 and MS2 in the SN report message, and continues to send downlink data to MS1 and MS2. the

In this embodiment, the target MMR-BS first sends the downlink data of MS1 and MS2 to RS2, RS2 transparently transmits them to RS0, and RS0 then sends the downlink data to MS1 and MS2. the

The wireless relay switching system of the present invention at least includes a switching node, a downlink transmission control node before switching, and a downlink transmission control node after switching. Among them, the handover node is MS or relay base station RS; the downlink transmission control node before handover is the base station MMR-BS or high-capacity RS supporting mobile multi-hop relay; the downlink transmission control node after handover is the base station supporting mobile multi-hop relay MMR-BS or High Capability RS. the

The method for realizing downlink data transmission in the wireless relay switching system of the present invention is: before the switching node performs switching, the downlink transmission control node before switching sends the current information position mark to the mobile terminal MS; after the switching node completes the switching, the MS sends the current information The position mark is sent to the downlink transmission control node after the handover; the downlink transmission control node continues to send downlink data to the MS according to the position indicated by the current information position mark after the handover. the

The wireless relay switching system of the present invention may also include several RSs, and these RSs are distributed in the link between the MS and the downlink transmission control node before and after the switch, and transparently transmit the MS and the downlink before and after the switch step by step. Transmission controls messages sent between nodes. the

The above descriptions are only preferred embodiments of the present invention, and are not intended to limit the protection scope of the present invention. the

Claims (16)

1. a wireless relay system realizes downlink data transmitting method, it is characterized in that this method may further comprise the steps:

A, before switching node switches, the downlink transfer Control Node is sent the current information position mark to portable terminal (MS) before switching;

B, after switching node accomplish to switch; When said switching node is the relay base station (RS) that can send synchronous head and resource allocation broadcast separately and possess resource allocation; And follow this switching node when switching simultaneously by an above MS of said switching node service; Said each MS sends to said switching node with current information position mark separately earlier; By said switching node the current information position mark of receiving is merged processing then, generate a new message, redispatch to switching back downlink transfer Control Node;

The downlink transfer Control Node continues to send downlink data to said MS according to the position of said current information position mark indication after C, the said switching.

2. the method for claim 1 is characterized in that, the downlink transfer Control Node is to support the base station (MMR-BS) of mobile multi-hop relaying or can send synchronous head and resource allocation broadcast separately and possess the RS of resource allocation before the said switching; It is said that to switch back downlink transfer Control Node be MMR-BS or can send synchronous head and resource allocation broadcast separately and possess the RS of resource allocation.

3. method as claimed in claim 2; It is characterized in that; When having an above RS in the link between downlink transfer Control Node before the said switching and the said MS; The method of sending the current information position mark described in the steps A is: the downlink transfer Control Node is through the said current information position mark of transparent transmission step by step of the RS in the said link, until arriving said MS before the said switching.

4. method as claimed in claim 2; It is characterized in that; When having an above RS in said switching node and the said link that switches between the downlink transfer Control Node of back; Switching node described in the step B will through the new information that merging to handle generates and send to the said method of switching back downlink transfer Control Node and be: said switching node through RS in the said link step by step transparent transmission handle the new information that generates through merging, downlink transfer Control Node after arriving said switchings.

5. method as claimed in claim 4; It is characterized in that; The method of sending downlink data described in the step C is: the said back downlink transfer Control Node of switching is through the said downlink data of transparent transmission step by step of the RS in the said link; Until arriving said switching node, said switching node sends to said MS with said downlink data again.

6. method as claimed in claim 4 is characterized in that, each RS in the said link, further comprises through before the new information transparent transmission that merges the processing generation said: the synchronizing station of said RS is used in the bandwidth of sending upstream message for this RS divides.

7. method as claimed in claim 6; It is characterized in that said synchronizing station is that said RS distributes the method for bandwidth to be: the synchronizing station of said RS is used in the bandwidth of sending upstream message for this RS divides in the uplink resource allocation broadcast of sending to said RS.

8. the method for claim 1 is characterized in that, further comprises before the said step B: the synchronizing station of said MS is used in the bandwidth of sending upstream message for this MS divides.

9. method as claimed in claim 8; It is characterized in that said synchronizing station is that said MS distributes the method for bandwidth to be: the synchronizing station of said MS is used in the bandwidth of sending upstream message for this MS divides in the uplink resource allocation broadcast of sending to said MS.

10. like each described method in the claim 1 to 9, it is characterized in that the position mark of current information described in the steps A is: the SDU SN that comprises Service Data Unit sequence number SDU SN expands sub-head; The position mark of current information described in the step B is: the SN report MAC head that comprises SDU SN.

11. the method for claim 1 is characterized in that, in said steps A, further comprises: said MS to said switching before the current information position mark that sends of downlink transfer Control Node carry out update calculation; In said step B, said MS sends to said switching node with said current information position mark through update calculation.

12. a wireless relay system is characterized in that, this system comprises:

Switching node before switching, receives the current information position mark that the downlink transfer Control Node is sent before switching; After accomplishing switching; The current information position mark that the above portable terminal (MS) that reception is served by said switching node sends also merges processing; Generate a new message; Said new message is sent to switching back downlink transfer Control Node, and receive the said downlink data that back downlink transfer Control Node is sent that switches; Said switching node is for sending synchronous head and resource allocation broadcast separately and possessing resource allocation and an above MS of this switching node service follows the relay base station (RS) that this switching node switches simultaneously;

Switch preceding downlink transfer Control Node, be used for the node of link control downlink transfer before said switching node switches, before said switching node switches, send said current information position mark to said switching node;

Switch back downlink transfer Control Node; Be used for switching the node of back link control downlink transfer at said switching node; After said switching node is accomplished switching; Receive the current information position mark that said switching node sends, and continue to send downlink data to said switching node according to the position of said current information position mark indication.

13. system as claimed in claim 12 is characterized in that, the downlink transfer Control Node is to support the base station (MMR-BS) of mobile multi-hop relaying or can send synchronous head and resource allocation broadcast separately and possess the RS of resource allocation before the said switching; It is said that to switch back downlink transfer Control Node be MMR-BS or can send synchronous head and resource allocation broadcast separately and possess the RS of resource allocation.

14. system as claimed in claim 13; It is characterized in that; In the link before the said switching between downlink transfer Control Node and the said switching node; Further comprise an above RS, be used for the current information position mark that downlink transfer Control Node before the said switching is sent is passed through said switching node step by step.

15. system as claimed in claim 13; It is characterized in that; In the said link that switches between back downlink transfer Control Node and the said switching node; Further comprise an above RS, be used for the current information position mark that said switching node sends is passed through said switching back downlink transfer Control Node step by step, and the said downlink data that switches back downlink transfer Control Node transmission is passed through said switching node step by step.

16. a relay base station (RS) is characterized in that, when following this RS by an above portable terminal (MS) of this RS service and switch simultaneously, said RS comprises with lower unit at least:

Descending forwarding control unit is used for the current information position mark that downlink transfer Control Node before switching is sent is transmitted to the MS by this RS service;

Merge processing unit, be used for after accomplishing switching, the current information position mark that the MS that reception is served by said RS sends also merges processing, generates new message;

The forwarded upstream control unit is used for the new information that said merging processing unit generates is sent to switching back downlink transfer Control Node.

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