CN101384020A - Wireless relay system and data transmission method - Google Patents
Wireless relay system and data transmission method Download PDFInfo
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- CN101384020A CN101384020A CNA2007101480631A CN200710148063A CN101384020A CN 101384020 A CN101384020 A CN 101384020A CN A2007101480631 A CNA2007101480631 A CN A2007101480631A CN 200710148063 A CN200710148063 A CN 200710148063A CN 101384020 A CN101384020 A CN 101384020A
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Abstract
The invention discloses a wireless relay system and the data transmission method thereof, which belong to the filed of wireless communication. The method of the invention includes the steps: first, a media access control layer (MAC) entity of a wireless relay station receives an MAC protocol data unit to be sent to a user terminal or a base station for the base station or the user terminal; then the MAC entity of the wireless relay station defines the length of the MAC protocol data unit which can be sent at present, analyzes the MAC protocol data unit which cannot be transmitted to the destination user terminal or the base station once and takes out the MAC protocol data unit to cache; finally, when the MAC entity of the wireless relay station sends the cached data, one or a plurality of MAC service data unit(s) is/are taken out to compose the MAC protocol data unit which conforms to the length requirement, and then the MAC protocol data unit is sent to the MAC entity of the destination user terminal or the base station. The invention also provides the wireless relay system, improves the success ratio for data transmission between BS and UT and the utilization ratio of wireless resources.
Description
Technical field
The invention belongs to field of wireless communication, particularly a kind of wireless relay system and data transmission method thereof.
Background technology
The framework of a kind of wireless access network (Radio Access Network) mainly is made up of a plurality of base station BSs (Base Station) and user side UT (User Terminal), by the network planning can be with base station distribution in suitable place to guarantee under limited transmitted power, can make the specific zone of covering of signal integrity.Yet when the coverage of planning base station, need consider that terrain and its features may cause shadow fading (shadow fading) effect of signal, cause effective coverage range need significantly dwindle to guarantee that user side suffers to still have under the serious shadow fading certain connection probability at signal.
Therefore arise at the historic moment with the notion that reduces the shadow fading effect by signal relay, its model as shown in Figure 1, promptly in wireless access network, introduce radio repeater station RS (Relay Station), received by RS from the wireless signal (perhaps data) of BS or UT emission, transmit UT or BS then respectively.In this system, BS and UT also can directly communicate between BS and the UT except communicating through RS forwarding data.A kind of possible protocol stack framework when BS of being shown in Figure 2 and UT directly carry out transfer of data Figure 3 shows that BS and UT a kind of possible protocol stack framework when transfer of data is carried out in the RS forwarding.Wherein protocol stack comprises physical layer PHY, media access control MAC, Radio Link control RLC and PDCP PDCP.
In said system, all wave point between BS and UT, BS and RS and RS and the UT, wherein the resource of the wave point between BS and UT, BS and the RS is managed by the radio resource management entity of BS and distributes, and the resource of the wave point between RS and the UT is managed by the radio resource management entity of RS and distributes.When between BS and UT, BS and RS and RS and UT, carrying out transfer of data, need determine the length of MACPDU according to the situation of wireless resource allocation situation and wireless signal environment, and and then the length of definite RLC PDU.Because the independence of BS and RS managing radio resources, the otherness of the wireless environment between the time-varying characteristics of wireless signal and BS and RS and RS and the UT, the MAC PDU that transmits between BS and RS and RS and the UT can not be complementary usually, thereby cause carrying out data transmission fails, have a strong impact on systematic function by RS.
Summary of the invention
The technical problem to be solved in the present invention is provide a kind of wireless relay system and data transmission method thereof, thereby raising BS and UT to transmit the success rate of transfer of data in the data procedures by RS.
In order to address the above problem, the invention provides the data transmission method in a kind of wireless relay system, the radio repeater station in this system comprises physical layer entity and media access control layer entity, this method may further comprise the steps:
(a) the media access control layer MAC entity of described radio repeater station from the base station or the MAC entity of user side receive the Medium Access Control (MAC) Protocol Data Unit will send to user side or base station;
(b) the MAC entity of described radio repeater station is determined the current Medium Access Control (MAC) Protocol Data Unit length that can send, and to can not a complete transmission resolving to the Medium Access Control (MAC) Protocol Data Unit of purpose user side or base station, takes out wherein MAC service data unit and buffer memory;
When (c) the MAC entity of described radio repeater station sends data in buffer, take out one or more MAC service data units of buffer memory and form the Medium Access Control (MAC) Protocol Data Unit that meets described length requirement, send to the MAC entity of purpose user side or base station.
In the above-mentioned data transmission method, in the step (b), the MAC entity of described radio repeater station can to from the base station or all Medium Access Control (MAC) Protocol Data Units that will send to user side or base station of receiving of user side all resolve, take out wherein MAC service data unit and buffer memory.
Perhaps, the MAC entity of described radio repeater station also can be at each user side, judgement from the base station or the Medium Access Control (MAC) Protocol Data Unit that will send to purpose user side or base station received of user side whether can one time complete transmission and the current MAC service data unit buffer queue of described user side whether be empty, if all be, directly it is forwarded to purpose user side or base station, otherwise, resolve this Medium Access Control (MAC) Protocol Data Unit and buffer memory MAC service data unit wherein.
In the above-mentioned data transmission method, step (b) also comprises, the MAC entity of described radio repeater station is during according to Medium Access Control (MAC) Protocol Data Unit header parsing Medium Access Control (MAC) Protocol Data Unit, preserve the MAC service data unit relevant information that comprises in the Medium Access Control (MAC) Protocol Data Unit head simultaneously, comprise in user side sign, Logic Channel Identifier, priority query's sign, formation sequence number, MAC service data unit length and the number information one or more;
Step (c) also comprises, the MAC entity of described radio repeater station takes out one or more MAC service data units from user's buffer queue when forming new Medium Access Control (MAC) Protocol Data Unit, constitutes new Medium Access Control (MAC) Protocol Data Unit head according to the described MAC service data unit relevant information of preserving.
Above-mentioned data transmission method, the MAC entity of radio repeater station described in the step (b) to from the base station or all Medium Access Control (MAC) Protocol Data Units that will send to user side or base station of receiving of user side all resolve, take out wherein the MAC service data unit and during buffer memory, the MAC entity of described radio repeater station resolve receive from the base station to send to the Medium Access Control (MAC) Protocol Data Unit of user side the time, as judging the MAC service data unit wherein comprise a plurality of users, each user's MAC service data unit is taken out the buffer queue of putting into separately;
The MAC entity of the described radio repeater station of step (c) reads the MAC service data unit of described buffer memory from each user's buffer queue, one or more MAC service data units of same user are formed the Medium Access Control (MAC) Protocol Data Unit that meets length requirement, send to this user side.
In the above-mentioned data transmission method, step (c) also comprises, the MAC entity of described radio repeater station takes out one or more MAC service data unit that the needs of receiving from user side send to the base station from one or more user's buffer queue, form a Medium Access Control (MAC) Protocol Data Unit that meets length requirement and send to the base station.
Perhaps, the MAC entity of described radio repeater station also can be at each user side, from the buffer queue of this user side, take out one or more MAC service data units, form this user's who meets length requirement protocol Data Unit, and send to purpose base station or described user side.
In the above-mentioned data transmission method, the wireless chain control layer RLC entity of described base station and/or user side is when the rlc protocol data cell that assembling will send, be not more than the minimum length of determining wireless link control protocol data cell under the condition of specified thresholds at the header overhead of this data cell, and assemble by this length; Perhaps
The maximum length of the earlier default rlc protocol data cell of described base station and/or user side, the length of the rlc protocol data cell that send of all assemblings all is no more than the maximum length of this default rlc protocol data cell.
The present invention also provides a kind of wireless relay system, comprise base station, user side and radio repeater station, wherein base station and user side comprise rlc protocol layer and PDCP protocol layer and carry out the peer layer transfer of data on this are two-layer, base station, radio repeater station and user side include PHY protocol layer, MAC protocol layer, base station, wireless relay stand in this and realize the peer layer transfer of data with radio repeater station respectively on two-layer, and the MAC entity of radio repeater station further comprises:
Receiving element is used to receive from the base station or the Medium Access Control (MAC) Protocol Data Unit that will send to user side or base station that the MAC entity of user side is sent;
Resolve buffer unit, be used for taking out wherein MAC service data unit and buffer memory can not a complete transmission resolving to the Medium Access Control (MAC) Protocol Data Unit of purpose user side or base station;
Data transmission unit, be used for determining the current Medium Access Control (MAC) Protocol Data Unit length that can send, when sending data in buffer, take out one or more MAC service data units of buffer memory and form the Medium Access Control (MAC) Protocol Data Unit that meets length requirement, send to the MAC entity of purpose user side or base station.
In the above-mentioned wireless relay system, all Medium Access Control (MAC) Protocol Data Units that the receiving element in the MAC entity of described radio repeater station will be received all output to the parsing buffer unit; Described parsing buffer unit is all resolved and buffer memory MAC service data unit wherein all Medium Access Control (MAC) Protocol Data Units of receiving.
In the above-mentioned wireless relay system, can also comprise a judging unit in the MAC entity of described radio repeater station, be used at each user side, according to the current Medium Access Control (MAC) Protocol Data Unit length that can send is judged from the base station or user side is received the Medium Access Control (MAC) Protocol Data Unit that will send to user side or base station whether can one time complete transmission and the current MAC service data unit buffer queue of this user side whether be empty, if all be, directly give data transmission unit with it and send, handle otherwise give the parsing buffer unit with it.
In the above-mentioned wireless relay system, described parsing buffer unit, during according to Medium Access Control (MAC) Protocol Data Unit header parsing Medium Access Control (MAC) Protocol Data Unit, preserve the MAC service data unit relevant information that comprises in the Medium Access Control (MAC) Protocol Data Unit head simultaneously, comprise in user side sign, Logic Channel Identifier, priority query's sign, formation sequence number, MAC service data unit length and the number information one or more;
Described data transmission unit when the one or more MAC service data units of taking-up are formed new Medium Access Control (MAC) Protocol Data Unit from user's buffer queue, constitutes new Medium Access Control (MAC) Protocol Data Unit head according to the described MAC service data unit relevant information of preserving.
In the above-mentioned wireless relay system, described parsing buffer unit, resolve receive from the base station to send to the Medium Access Control (MAC) Protocol Data Unit of user side the time, as judging the MAC service data unit wherein comprise a plurality of users, each user's MAC service data unit is taken out the buffer queue of putting into separately;
Described data transmission unit reads the MAC service data unit of described buffer memory from each user's buffer queue, one or more MAC service data units of same user are formed the Medium Access Control (MAC) Protocol Data Unit that meets length requirement, sends to this user side.
In the above-mentioned wireless relay system, described data transmission unit, can from one or more user's buffer queue, take out one or more MAC service data unit that the needs of receiving from user side send to the base station, form a Medium Access Control (MAC) Protocol Data Unit that meets length requirement and send to the base station.
Perhaps, described data transmission unit also can be at each user side, from the buffer queue of this user side, take out one or more MAC service data units, form this user's who meets length requirement Medium Access Control (MAC) Protocol Data Unit, and send to purpose base station or described user side.
In the above-mentioned wireless relay system, the wireless chain control layer RLC entity of described base station and/or user side is when the rlc protocol data cell that assembling will send, be not more than the minimum length of determining wireless link control protocol data cell under the condition of specified thresholds at the header overhead of this data cell, and assemble by this length;
The maximum length of the earlier default rlc protocol data cell of perhaps described base station and/or user side, the length of the rlc protocol data cell that send of all assemblings all is no more than the maximum length of this default rlc protocol data cell.
Technical solution of the present invention is by adapting to the independence owing to BS and RS managing radio resources, the otherness of the wireless environment between the time-varying characteristics of the wireless signal that is caused and BS and RS and RS and the UT, thereby improved the data transmission success between BS and the UT, and the service efficiency of Radio Resource.
Description of drawings
Fig. 1 is the wireless relay system schematic diagram;
Protocol stack framework schematic diagram when Fig. 2 directly carries out transfer of data for BS in the system shown in Figure 1 and UT;
Fig. 3 is protocol stack framework schematic diagram when carrying out transfer of data between BS in the system shown in Figure 1 and RS, RS and the UT;
Fig. 4 is protocol stack framework schematic diagram when carrying out transfer of data between BS and RS, RS and the UT among the embodiment 1 that adopts technical solution of the present invention;
Fig. 5 is multiplexed into the schematic diagram of MAC PDU process for RLC PDU among the embodiment 1 that adopts technical solution of the present invention;
Fig. 6 is the process schematic diagram of the fractionation of MAC entity, buffer memory and the reorganization MAC PDU of RS among the embodiment 1 that adopts technical solution of the present invention.
Embodiment
Main design of the present invention is, in the MAC of RS entity, the Medium Access Control (MAC) Protocol Data Unit PDU that receives is resolved into MAC service data unit SDU, concrete condition according to system reassembles into MAC PDU then, wherein in order to adapt to the independence of BS and RS managing radio resources, the otherness of the wireless environment between the time-varying characteristics of wireless signal and BS and RS and RS and the UT, MAC entity between BS and RS, RS and the UT can be assembled different MAC PDU respectively, thereby improve the data transmission success between BS and the UT, improve the service efficiency of Radio Resource.
Below in conjunction with accompanying drawing the technical solution used in the present invention is described in further detail.
Wireless relay system of the present invention comprises BS, UT and RS, BS, UT and RS protocol stack framework separately as shown in Figure 4, wherein BS, UT comprise PDCP entity, RLC entity, MAC entity and PHY entity, and RS only comprises physical layer PHY entity and media access control layer MAC entity.BS, UT carry out the peer layer transfer of data on rlc protocol layer and PDCP protocol layer, and BS, UT realize the peer layer transfer of data with RS respectively on PHY protocol layer, MAC protocol layer.
The MAC entity of RS receives MAC PDU from the MAC entity of BS or UT, and this MACPDU resolved, buffer memory MAC SDU wherein, when sending data in buffer, determine the current Medium Access Control (MAC) Protocol Data Unit length that can send, the one or more MAC SDU that take out buffer memory according to this length form MAC PDU, send to the MAC entity of purpose user side or base station.This MAC entity further comprises:
Receiving element is used to receive from the base station or the MAC PDU that will send to user side or base station that the MAC entity of user side is sent, is sent to resolve buffer unit and handle;
Resolve buffer unit, be used for the MAC PDU that receives is resolved, and taking-up MACSDU and buffer memory wherein.During according to Medium Access Control (MAC) Protocol Data Unit header parsing Medium Access Control (MAC) Protocol Data Unit, preserve the MAC service data unit relevant information that comprises in the Medium Access Control (MAC) Protocol Data Unit head, as judge that MACPDU comprises a plurality of users' MAC SDU, then each user's MAC SDU is taken out and puts into buffer queue separately.
Data transmission unit, be used for determining the current MAC PDU length that can send, at down direction, from each user's buffer queue, read the MAC service data unit of described buffer memory, one or more MAC service data units of same user are formed the Medium Access Control (MAC) Protocol Data Unit that meets length requirement, send to this user side; At up direction, the needs that taking-up is received from user side from one or more user's buffer queue send to one or more MAC service data unit of base station, form a Medium Access Control (MAC) Protocol Data Unit that meets length requirement and send to the base station; Perhaps, from the buffer queue of this user side, take out one or more MAC service data units, form this user's who meets length requirement Medium Access Control (MAC) Protocol Data Unit, and send to the base station at each user side.When forming new Medium Access Control (MAC) Protocol Data Unit, need constitute new Medium Access Control (MAC) Protocol Data Unit head according to the MAC service data unit relevant information of preserving.
Be example through RS to the process that UT sends data with BS below, its concrete data transmission procedure may further comprise the steps:
The radio resource management entity distributing radio resource of step 1:BS is used to send data to RS, the MAC entity of BS is according to the definite MAC PDU length that can transmit of factors such as wireless environment and assigned radio resource between BS and the RS, then according to the MAC PDU length of determining, one or more RLC PDU (being MAC SDU), MAC PDU head (Header) and necessary filling bit are formed MAC PDU, send to RS;
In this step, the process of the MAC entity assembling MAC PDU of BS as shown in Figure 5, in order to make the MAC entity of RS can carry out the reorganization of MAC SDU more flexibly, to adapt to wireless environment situation and the resource allocation conditions between RS and the UT, when in the RLC of BS entity, assembling RLCPDU, be not more than the minimum length of determining RLCPDU under the condition of specified thresholds in the expense of this RLC PDU Header, and assemble by this length, perhaps preset the maximum length of a rlc protocol data cell in BS earlier, the length of the rlc protocol data cell that send of all assemblings all is no more than the maximum length of this default rlc protocol data cell.
In addition, the MAC entity of BS can be assembled into one or more RLC PDU of a plurality of users among the MAC PDU, sends to RS.In order to identify the RLC PDU of different user, can in the MAC SDU relevant information among the header of MAC PDU, comprise the user side sign.BS also can be configured to only support same user's RLC PDU is assembled into a MAC PDU.
The MAC entity of step 2:RS receives MAC PDU from the MAC entity of BS, then the MAC PDU that receives is resolved, and takes out one or more MAC SDU, and stores these MAC SUD into buffer area, and its process as shown in Figure 6;
The MAC entity of RS as is judged the MAC SDU that comprises a plurality of users among the MAC PDU that receives in resolving, then each user's MAC SDU is taken out and puts into buffer queue separately.
In this step, when the MAC entity of RS is separated parsing MAC PDU and buffer memory MAC SDU according to MAC PDU header, need to preserve the information relevant that comprises among the MAC PDU header with MAC SDU, comprise the user side sign, Logic Channel Identifier, priority query's sign, formation sequence number, one or more information in the information such as MAC SDU length, number.
The radio resource management entity distributing radio resource of step 3:RS is used to send data to UT, when the MAC entity of RS sends data in buffer, the MAC entity of RS is determined the MAC PDU length that current (referring to current transmission time interval) can send according to factors such as wireless environment and assigned radio resource between RS and the UT, then according to the MAC PDU length of determining, one or more MAC SDU that will take out from buffer area, form the new MAC PDU that meets described MAC PDU length requirement with MAC PDU Header, necessary filling bit, send to UT, as shown in Figure 6;
The MAC entity of RS need constitute new MAC PDUheader according to the relevant information of the MAC SDU that preserves when the one or more MAC SDU of taking-up form new MAC PDU from buffer queue.
When there was a plurality of users' buffer queue in buffer area, the MAC entity of RS read MAC SDU from each user's buffer queue, and the MAC PDU with one or more MAC SDU of same user form this user sends to corresponding user side.
The MAC entity of step 4:UT receives the MAC PDU from RS, separates parsing MAC PDU, takes out one or more MAC SDU, and promptly RLC PDU sends to the RLC entity.
Said method has been described BS through the process of RS to UT transmission data, and for the process of UT process RS to BS transmission data, UT forms MAC PDU, and to send to the processing of the processing of RS and BS side basic identical, can just there be the processing that a plurality of users' MAC SDU is assembled into a MAC PDU with reference to step 1.And in this process, be cached to the buffer queue of each UT after the MAC entity of RS is resolved the MAC PDU that sends from UT respectively, need equally to preserve when the information relevant with MAC SDU that comprises among the MACPDU header regenerates MAC PDU for the MAC entity of RS and use.When sending up direction data cached, the MAC entity of RS takes out MAC PDU who meets length requirement of one or more MAC SDU composition and sends to the base station from one or more user's buffer queue; Perhaps at each user side, the MAC entity of radio repeater station takes out one or more MAC SDU from the buffer queue of this user side, forms this user's who meets length requirement MAC PDU, and sends to the base station.
Present embodiment based on system architecture identical with embodiment 1, BS, UT carry out the peer layer transfer of data on rlc protocol layer and PDCP protocol layer, and BS, UT realize the peer layer transfer of data with RS respectively on PHY protocol layer, MAC protocol layer.
Media access control layer MAC entity and embodiment 1 among the RS are different, further comprise:
Receiving element is used to receive from the base station or the MAC PDU that will send to user side or base station that the MAC entity of user side is sent, and triggers judging unit and handle.
Judging unit, be used at each user side (comprising data that will send to this user side and the data of sending from this user side), according to the current MAC PDU length that can send is judged from the base station or user side is received the Medium Access Control (MAC) Protocol Data Unit that will send to user side or base station whether can one time complete transmission and the current MAC SDU buffer queue (buffer queue that comprises the uplink and downlink direction) of this user side whether be empty, if all be, directly giving data transmission unit with it sends, if can not one time complete transmission or the current MAC SDU buffer queue of this user side be not empty, give and resolve buffer unit and handle.
Resolve buffer unit, be used for the MAC PDU that receives is resolved, take out wherein MACSDU and buffer memory, during according to Medium Access Control (MAC) Protocol Data Unit header parsing Medium Access Control (MAC) Protocol Data Unit, preserve the MAC service data unit relevant information that comprises in the Medium Access Control (MAC) Protocol Data Unit head simultaneously.
Data transmission unit is used at each user side, determines the current MAC PDU length (comprising the uplink and downlink direction) that can send; Directly transmit the complete MAC PDU that receives and give purpose user side or base station, perhaps take out the MAC PDU that one or more MAC SDU in the user cache formation form this user who meets length requirement, send to purpose user side or base station, when forming Medium Access Control (MAC) Protocol Data Unit, constitute new Medium Access Control (MAC) Protocol Data Unit head according to the described MAC service data unit relevant information of preserving.
In the said system, judge that as the MAC entity of RS the current MAC SDU buffer memory of UT is empty, and when current channel conditions can once be transferred to the MAC PDU that receives MAC PDU length that purpose user side or base station promptly receive and is not more than the current MAC PDU length that can send of this user side, directly it is forwarded to the MAC entity of purpose user side or base station.
Said system realizes that BS and UT may further comprise the steps through the method that RS transmits data, and this step has been described the processing of uplink and downlink simultaneously:
The MAC entity of step a:RS receives MAC PDU from the MAC entity of BS or the MAC entity of UT;
In this step, the radio resource management entity distributing radio resource of BS or RS is used to send data to RS, the MAC entity of BS or UT is according to the definite MAC PDU length that can transmit of factors such as wireless environment and assigned radio resource between BS or UT and the RS, then according to the MACPDU length of determining, one or more RLC PDU (being MAC SDU), MAC PDU head (Header) and necessary filling bit are formed MAC PDU, send to RS;
Wherein, in order to make the MAC entity of RS can carry out the reorganization of MAC SDU more flexibly, to adapt to wireless environment situation and the resource allocation conditions between RS and BS or the UT, when in the RLC of BS or UT entity, assembling RLC PDU, be not more than the minimum length of determining RLC PDU under the condition of specified thresholds in the expense of this RLC PDU Header, and assemble by this length, perhaps preset the maximum length of a rlc protocol data cell in BS or UT earlier, the length of the rlc protocol data cell that send of all assemblings all is no more than the maximum length of this default rlc protocol data cell.
The MAC entity of step b:RS is at each user side, determine the MAC PDU length of current can the transmission (comprising the uplink and downlink direction), and judge whether the current MAC SDU buffer queue of this UT is empty, if be not empty, then this MAC PDU is resolved, take out MAC SDU buffer memory wherein; If it is empty, again current MAC PDU length that can send and the Medium Access Control (MAC) Protocol Data Unit length that receives are compared, as the complete MAC PDU that receives once can be transferred to purpose user or base station the time, then directly transmit this MAC PDU to UT or BS, process ends, otherwise, this MAC PDU is resolved, take out MAC SDU buffer memory wherein, carry out next step;
Wherein, when the MAC entity of RS is separated parsing MAC PDU and buffer memory MAC SDU according to MAC PDU header, need to preserve the information relevant that comprises among the MAC PDU header with MAC SDU, identify as user side, Logic Channel Identifier, priority query's sign, formation sequence number, one or more information in the information such as MACSDU length, number;
The MAC entity of step c:RS is when sending data in buffer, at each user side, length according to the MAC PDU that can send that determines, from the MAC SDU of buffer memory, take out one or more MAC SDU, form the new MAC PDU that meets this length requirement with MAC PDU Header, necessary filling bit, send to the MAC entity of UT or the MAC entity of BS.
In this step, the radio resource management entity distributing radio resource of BS or RS is used for RS and sends data to BS or UT, and the MAC entity of RS is according to the definite MAC PDU length that can transmit of factors such as wireless environment and assigned radio resource between BS or UT and the RS.
Decompose the method that MAC PDU becomes the MACSDU and the MAC PDU that recombinates in the MAC entity that has adopted at RS in the foregoing description 1,2, make the MAC entity between BS and RS, RS and the UT can assemble different MAC PDU respectively simultaneously, thereby the independence that adapts to BS and RS managing radio resources, the otherness of the wireless environment between the time-varying characteristics of wireless signal and BS and RS and RS and the UT has finally improved the data transmission success between BS and the UT and the service efficiency of Radio Resource.
Certainly, above-mentioned specific embodiment is not the further qualification to technical solution of the present invention, and any those of ordinary skill in the art replaced or corresponding improvement the technology of the present invention feature being equal to of being done, still within protection scope of the present invention.
Claims (16)
1, the data transmission method in a kind of wireless relay system, the radio repeater station in this system comprises physical layer entity and media access control layer entity, it is characterized in that, this method may further comprise the steps:
(a) the media access control layer MAC entity of described radio repeater station from the base station or the MAC entity of user side receive the Medium Access Control (MAC) Protocol Data Unit will send to user side or base station;
(b) the MAC entity of described radio repeater station is determined the current Medium Access Control (MAC) Protocol Data Unit length that can send, and to can not a complete transmission resolving to the Medium Access Control (MAC) Protocol Data Unit of purpose user side or base station, takes out wherein MAC service data unit and buffer memory;
When (c) the MAC entity of described radio repeater station sends data in buffer, take out one or more MAC service data units of buffer memory and form the Medium Access Control (MAC) Protocol Data Unit that meets described length requirement, send to the MAC entity of purpose user side or base station.
2, data transmission method as claimed in claim 1 is characterized in that:
In the step (b), the MAC entity of described radio repeater station to from the base station or all Medium Access Control (MAC) Protocol Data Units that will send to user side or base station of receiving of user side all resolve, take out wherein MAC service data unit and buffer memory.
3, data transmission method as claimed in claim 1 is characterized in that:
In the step (b), the MAC entity of described radio repeater station is at each user side, judgement from the base station or the Medium Access Control (MAC) Protocol Data Unit that will send to purpose user side or base station received of user side whether can one time complete transmission and the current MAC service data unit buffer queue of described user side whether be empty, if all be, directly it is forwarded to purpose user side or base station, otherwise, resolve this Medium Access Control (MAC) Protocol Data Unit and buffer memory MAC service data unit wherein.
4, as claim 1,2 or 3 described data transmission methods, it is characterized in that:
The MAC entity of the described radio repeater station of step (b) is during according to Medium Access Control (MAC) Protocol Data Unit header parsing Medium Access Control (MAC) Protocol Data Unit, preserve the MAC service data unit relevant information that comprises in the Medium Access Control (MAC) Protocol Data Unit head simultaneously, comprise in user side sign, Logic Channel Identifier, priority query's sign, formation sequence number, MAC service data unit length and the number information one or more;
The MAC entity of the described radio repeater station of step (c) takes out one or more MAC service data units from user's buffer queue when forming new Medium Access Control (MAC) Protocol Data Unit, constitutes new Medium Access Control (MAC) Protocol Data Unit head according to the described MAC service data unit relevant information of preserving.
5, data transmission method as claimed in claim 2 is characterized in that:
The MAC entity of the described radio repeater station of step (b) resolve receive from the base station to send to the Medium Access Control (MAC) Protocol Data Unit of user side the time, as judging the MAC service data unit wherein comprise a plurality of users, each user's MAC service data unit is taken out the buffer queue of putting into separately;
The MAC entity of the described radio repeater station of step (c) reads the MAC service data unit of described buffer memory from each user's buffer queue, one or more MAC service data units of same user are formed the Medium Access Control (MAC) Protocol Data Unit that meets length requirement, send to this user side.
6, data transmission method as claimed in claim 1 or 2 is characterized in that:
In the step (c), the MAC entity of described radio repeater station takes out one or more MAC service data unit that the needs of receiving from user side send to the base station from one or more user's buffer queue, form a Medium Access Control (MAC) Protocol Data Unit that meets length requirement and send to the base station.
7, as claim 2,3 or 5 described data transmission methods, it is characterized in that:
In the step (c), the MAC entity of described radio repeater station is at each user side, from the buffer queue of this user side, take out one or more MAC service data units, form this user's who meets length requirement protocol Data Unit, and send to purpose base station or described user side.
8, as claim 1,2 or 3 described data transmission methods, it is characterized in that:
The wireless chain control layer RLC entity of described base station and/or user side is when the rlc protocol data cell that assembling will send, be not more than the minimum length of determining wireless link control protocol data cell under the condition of specified thresholds at the header overhead of this data cell, and assemble by this length; Perhaps
The maximum length of the earlier default rlc protocol data cell of described base station and/or user side, the length of the rlc protocol data cell that send of all assemblings all is no more than the maximum length of this default rlc protocol data cell.
9, a kind of wireless relay system, comprise base station, user side and radio repeater station, it is characterized in that, base station and user side comprise rlc protocol layer and PDCP protocol layer and carry out the peer layer transfer of data on this are two-layer, base station, radio repeater station and user side include PHY protocol layer, MAC protocol layer, base station, wireless relay stand in this and realize the peer layer transfer of data with radio repeater station respectively on two-layer, and wherein the MAC entity of radio repeater station comprises:
Receiving element is used to receive from the base station or the Medium Access Control (MAC) Protocol Data Unit that will send to user side or base station that the MAC entity of user side is sent;
Resolve buffer unit, be used for taking out wherein MAC service data unit and buffer memory can not a complete transmission resolving to the Medium Access Control (MAC) Protocol Data Unit of purpose user side or base station;
Data transmission unit, be used for determining the current Medium Access Control (MAC) Protocol Data Unit length that can send, when sending data in buffer, take out one or more MAC service data units of buffer memory and form the Medium Access Control (MAC) Protocol Data Unit that meets length requirement, send to the MAC entity of purpose user side or base station.
10, wireless relay system as claimed in claim 9 is characterized in that,
All Medium Access Control (MAC) Protocol Data Units that receiving element in the MAC entity of described radio repeater station will be received all output to the parsing buffer unit; Described parsing buffer unit is all resolved and buffer memory MAC service data unit wherein all Medium Access Control (MAC) Protocol Data Units of receiving.
11, wireless relay system as claimed in claim 9 is characterized in that,
Also comprise a judging unit in the MAC entity of described radio repeater station, be used at each user side, according to the current Medium Access Control (MAC) Protocol Data Unit length that can send is judged from the base station or user side is received the Medium Access Control (MAC) Protocol Data Unit that will send to user side or base station whether can one time complete transmission and the current MAC service data unit buffer queue of this user side whether be empty, if all be, directly give data transmission unit with it and send, handle otherwise give the parsing buffer unit with it.
12, as claim 9,10 or 11 described wireless relay system, it is characterized in that,
Described parsing buffer unit, during according to Medium Access Control (MAC) Protocol Data Unit header parsing Medium Access Control (MAC) Protocol Data Unit, preserve the MAC service data unit relevant information that comprises in the Medium Access Control (MAC) Protocol Data Unit head simultaneously, comprise in user side sign, Logic Channel Identifier, priority query's sign, formation sequence number, MAC service data unit length and the number information one or more;
Described data transmission unit when the one or more MAC service data units of taking-up are formed new Medium Access Control (MAC) Protocol Data Unit from user's buffer queue, constitutes new Medium Access Control (MAC) Protocol Data Unit head according to the described MAC service data unit relevant information of preserving.
13, wireless relay system as claimed in claim 10 is characterized in that,
Described parsing buffer unit, resolve receive from the base station to send to the Medium Access Control (MAC) Protocol Data Unit of user side the time, as judging the MAC service data unit wherein comprise a plurality of users, each user's MAC service data unit is taken out the buffer queue of putting into separately;
Described data transmission unit reads the MAC service data unit of described buffer memory from each user's buffer queue, one or more MAC service data units of same user are formed the Medium Access Control (MAC) Protocol Data Unit that meets length requirement, sends to this user side.
14, as claim 9 or 10 described wireless relay system, it is characterized in that,
Described data transmission unit, the needs that taking-up is received from user side from one or more user's buffer queue send to one or more MAC service data unit of base station, form a Medium Access Control (MAC) Protocol Data Unit that meets length requirement and send to the base station.
15, as claim 10,11 or 13 described wireless relay system, it is characterized in that,
Described data transmission unit is taken out one or more MAC service data units at each user side from the buffer queue of this user side, form this user's who meets length requirement Medium Access Control (MAC) Protocol Data Unit, and send to purpose base station or described user side.
16, as claim 9,10 or 11 described wireless relay system, it is characterized in that,
The wireless chain control layer RLC entity of described base station and/or user side is when the rlc protocol data cell that assembling will send, be not more than the minimum length of determining wireless link control protocol data cell under the condition of specified thresholds at the header overhead of this data cell, and assemble by this length;
The maximum length of the earlier default rlc protocol data cell of perhaps described base station and/or user side, the length of the rlc protocol data cell that send of all assemblings all is no more than the maximum length of this default rlc protocol data cell.
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