CN102035632B - Data transmission method and system in wireless relay scene - Google Patents
Data transmission method and system in wireless relay scene Download PDFInfo
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- CN102035632B CN102035632B CN2009100931657A CN200910093165A CN102035632B CN 102035632 B CN102035632 B CN 102035632B CN 2009100931657 A CN2009100931657 A CN 2009100931657A CN 200910093165 A CN200910093165 A CN 200910093165A CN 102035632 B CN102035632 B CN 102035632B
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Abstract
The invention discloses a data transmission method in a wireless relay scene, which comprises the following steps that: a donor evolved node B (donor-eNB) and a relay pre-negotiate a redundancy version (RV) sequence and data retransmission time during downlink data retransmission; and the donor-eNB and the relay perform downlink data cooperative retransmission on the UE according to the pre-negotiated RV sequence and the pre-negotiated data retransmission time during the downlink data retransmission when knowing that initially transmitted data sent to user equipment (UE) fail. The invention also discloses a data transmission system in the wireless relay scene. By the method and the system, frequent information exchange between the donor-eNB and the relay for data retransmission resource scheduling is avoided, resources of a Un interface control channel and a data shared channel are saved, and data transmission delay is reduced simultaneously.
Description
Technical field
The present invention relates to the relaying technique of radio communication, relate in particular to data transmission method and system under a kind of wireless relay scene.
Background technology
In order to meet the demand of growing large bandwidth high-speed mobile access, third generation partner program (3GPP, Third Generation Partnership Projects) at Long Term Evolution (LTE, Long TermEvolution) release senior Long Term Evolution (LTE-Advanced, Long TermEvolution advance) standard on the basis of system.LTE-Advanced is the evolution to the LTE technology, and the core that it has retained the LTE technology adopts series of new techniques to realize improving the purposes such as the availability of frequency spectrum, increase power system capacity and data throughput on this basis.Wireless relay (Relay) technology is one of technology in LTE-Advanced, is intended to the coverage of Extended Cell, reduces the blind spot area in communication, balanced load, shift the business of hot zones, save the transmitting power of user terminal (UE, User Equipment).The network configuration that contains wireless relay, increase some new via node (RN between original base station (Donor-eNB) and UE, Relay-Node), by wireless connections, and there is no wired connection between transmission network between the RN that these are newly-increased and Donor-eNB.Wherein, the air interface between Donor-eNB and RN is called the Un mouth, and wireless link is called back haul link (backhaul link); Air interface between RN and UE is called the Uu mouth, and link is called access link (access link).Downlink data first arrives Donor-eNB, and then passes to RN, and RN transfers to UE again, otherwise up.
Via node has different implementations and sorting technique, for example: according to wireless data, forwarding is at physics (PHY, Physical) layer (also claiming the L1 layer), or at media access control (MAC, MediumAccess Control) layer (also claiming the L2 layer), can be divided into L1 via node or L2 via node to via node; According to back haul link and access link, whether use identical frequency can be divided into (In-band) via node or outer (Out-of-band) via node of band in band.In the research of current 3GPP, realize feasibility according to networking demand and technology in the future, mainly define two kinds of via node types, be referred to as first kind via node (Type I Relay) and Equations of The Second Kind via node (Type II Relay).
First kind via node has the Physical Cell Identifier (PCI of self, Physical CellIdentificaiton), have in upper and lower provisional capital control channel and the data channel that is independent of Donor eNB, the UE of first kind via node under it covers is a new eNB.When UE covers and to be moved to Donor eNB and to cover the process that need to switch of time from first kind via node.First kind via node is mainly used in cover expanding, or to the covering of blind spot, hot zones.
The Equations of The Second Kind via node does not have the PCI of self, the control channel that also there is no self, UE under its covering still need to receive resource scheduling information and other control informations from Donor eNB, and the Equations of The Second Kind via node is mainly to assist DeNB UE to be carried out to the cooperative transmission of up-downgoing data.The UE of Equations of The Second Kind via node under it covers, be transparent substantially, UE still thinks it oneself is under Donor eNB community covers, and UE covers to be moved to Donor eNB covering from the Equations of The Second Kind via node not to be needed to switch yet.The application scenarios of Equations of The Second Kind via node is mainly to realize combining covering (OverlappedCoverage) with DeNB, as shown in Figure 1.
The Equations of The Second Kind via node usually completes the transfer of data to UE with Donor eNB to work in coordination with together with (cooperative) mode.So-called collaborative, refer to Donor eNB and Equations of The Second Kind via node on the identical moment and identical resource to the UE sending/receiving identical data, thereby form the transmission diversity gain, increase the success rate of transfer of data.Typical working method is: Donor eNB by the UE downlink data at the Un port transmission to the Equations of The Second Kind via node, this process is transparent to UE; Donor eNB and Equations of The Second Kind via node are combined transfer of data in the identical moment and identical resource coordinating to UE.
Because Un and Uu mouth are used identical frequency, the Equations of The Second Kind via node can not receive Donor eNB downlink data and send downlink data at the Uu mouth to UE at the Un mouth simultaneously, or sends upstream data and receive at the Uu mouth upstream data that UE sends to DonoreNB at the Un mouth simultaneously.For this reason, the ascending-descending subframes of the ascending-descending subframes of Un mouth and Uu mouth is multiplexing in the mode of time-division (TDM, Time Division Multiplexing).Un mouth ascending-descending subframes number can be pre-configured in semi-static mode.
Donor eNB is still used with the similar dynamic dispatching of LTE and mixed automatic retransfer request (HARQ, Hybrid Automatic Repeat reQuest) mechanism and completes the scheduling of resource of RN and transfer of data at the Un mouth.Dynamic dispatching refers to, Donor eNB can pass through Physical Downlink Control Channel (PDCCH, Physical Downlink Control Channel) Shang community-Radio Network Temporary Identifier (C-RNTI, CellRadio Network Temporary Identifier) at each Transmission Time Interval (TTI, Transmit TimeInterval), to UE dynamic assignment resource, as: Physical Resource Block (PRB, Physical Resource Block) and Modulation and Coding Scheme (MCS, Modulation and Coding Scheme) etc.RN always monitors PDCCH, thereby find possible resource for descending reception, distributes.PDCCH carries the downlink resource assignment information while being used for descending scheduling, main contents comprise Resource Block RB assignment information, transformat (TF, TransportFormat) or MCS, HARQ information, transmission power control (TPC, Transmit Power Control) information such as information, RNTI/ cyclic redundancy check (CRC) (CRC, Cyclical Redundancy Check).RN sends the confirmation of feedback HARQ/non-confirmation (ACK/NACK) response message by Physical Uplink Control Channel (PUCCH, Physical Uplink Control Channel) to downlink data.
The modes such as HARQ function employing N road concurrent process are sent and are retransmitted transmission block (TB, Transport Block), the reliability successfully sent for improving transmission block between L1 layer peer-entities.These HARQ processes and HARQ entity are associated, and the HARQ entity is at the asynchronous adaptive retransmission of descending support, refer to that need to be dispatched the opportunity retransmitted by the control channel of L1/L2 layer, and can use from head and pass different Radio Resources, MCS etc.In the LTE system, the control channel of L1/L2 layer refers to PDCCH.Send the initial redundancy version (RV of transmission block during the first biography of HARQ, Redundancy Version), when retransmitting, HARQ sends other redundancy versions of transmission block, HARQ is first to be passed and HARQ retransmits the same HARQ process of using, and receiving terminal is carried out soft union operation at this HARQ process buffering area by the redundancy versions of the redundancy versions of the re-transmission that receives and the head biography that receives.HARQ Loop Round Trip Time (HARQ RTT, HARQ Round TripTime) refers to the shortest time interval between the first biography of HARQ and HARQ re-transmission, and after the first biography of HARQ, HARQ retransmits and at least will just can be scheduled after the HARQ RTT time.Descending, each HARQ process has an explicit identifier, is called HARQ process identification (PID) (HARQ Process identifier).When E-UTRAN carries out dynamic dispatching, need to indicate the HARQ process identification (PID) to specify UE to use which HARQ process to process corresponding transmission block by PDCCH.
In the working method of above-mentioned Equations of The Second Kind via node, if Donor eNB and Equations of The Second Kind via node are to first the biography unsuccessfully of the downlink data of UE and during the needs re-transmission, according to the asynchronous adaptive retransmission mode of traditional downlink data, Donor eNB need to send the scheduling downlink resource instruction (DL Assignment) for the data retransmission scheduling of resource on PDCCH, be used for the downlink resource of data retransmission except indication in DL Assignment, outside the new information such as modulation coding mode, also need to comprise No. RV of data retransmission.In order when retransmitting, also to utilize the Equations of The Second Kind via node to carry out cooperative transmission, above-mentioned data retransmission schedule information also need to be by Donor eNB notice Equations of The Second Kind via node before retransmitting generation, the limited resources that the DonoreNB produced due to data re-transmission and the information interaction between the Equations of The Second Kind via node have not only taken the Un mouth, also caused the delay of transfer of data.
Summary of the invention
In view of this, main purpose of the present invention is to provide data transmission method and the system under a kind of wireless relay scene, to solve downlink data re-transmission of the prior art, takies Un mouth resource, causes the problem of data transfer delay.
For achieving the above object, technical scheme of the present invention is achieved in that
The invention provides the data transmission method under a kind of wireless relay scene, the method comprises:
Base station (Donor-eNB) and via node (Relay) are consulted when downlink data retransmits redundancy versions (RV) order and the data re-transmission time of using in advance;
Described Donor-eNB and Relay, when knowing that the head that sends to user terminal (UE) passes data failure, RV order and the data re-transmission time of using while retransmitting according to the downlink data of consulting in advance, carry out the collaborative re-transmission of downlink data to described UE.
Described RV and the data re-transmission time of consulting in advance, by agreement, stipulate; The Radio Resource of perhaps by described Donor-eNB, being selected and passing through the Relay special use is controlled (RRC) signaling to described Relay; The mode of perhaps by described Donor-eNB, with media access control MAC, controlling cell sends to described Relay together with the UE data-reusing.
The described collaborative re-transmission that UE is carried out to downlink data is specially:
The data re-transmission time of using while retransmitting according to described downlink data, to described UE send scheduling downlink resource instruction DL Assignment by described Donor-eNB Physical Downlink Control Channel (PDCCH) is upper in the moment retransmit occurred, and the RV used while retransmitting according to described downlink data sequentially arranges the RV in DLAssignment; Resource scheduling information in described DL Assignment except RV is identical while passing with data modulation coding mode and data are first;
In the same Transmission Time Interval (TTI) with described DL Assignment transmission, described Donor-eNB and Relay carry out the collaborative re-transmission of downlink data on identical resource, and the RV of data retransmission is sequentially arranged according to the described RV consulted in advance.
The described collaborative re-transmission that UE is carried out to downlink data is specially:
The data re-transmission time of using while retransmitting according to described downlink data, send DL Assignment to described UE by described Donor-eNB in the moment retransmit occurred on PDCCH, and the RV used while retransmitting according to described downlink data sequentially arranges the RV in DL Assignment; Resource scheduling information in described DL Assignment except RV is identical while passing with data modulation coding mode and data are first;
In the same TTI with described DL Assignment transmission, described Relay carries out alone the re-transmission of downlink data, and the RV of data retransmission is sequentially arranged according to the described RV consulted in advance.
The method further comprises: if described Relay is before the transmission data retransmission, receive the new DLAssignment of described Donor-eNB about same mixed automatic retransfer request (HARQ) process of described UE, interrupt the transmission of current data retransmission, and carry out the collaborative re-transmission of data according to described new DL Assignment.
The present invention also provides the data transmission system under a kind of wireless relay scene, and this system comprises: base station and via node, wherein,
Described base station, for with described via node, consulting in advance when downlink data retransmits RV order and the data re-transmission time of using, and when knowing that the head that sends to UE passes data failure, RV order and the data re-transmission time of while retransmitting according to the downlink data of consulting in advance, using, collaborative described via node carries out the re-transmission of downlink data to UE;
Described via node, for with described base station, consulting in advance when downlink data retransmits RV order and the data re-transmission time of using, and when knowing that the head that sends to UE passes data failure, RV order and the data re-transmission time of while retransmitting according to the downlink data of consulting in advance, using, the re-transmission of downlink data is carried out in collaborative described base station to UE.
Described RV and the data re-transmission time of consulting in advance, by agreement, stipulate; Perhaps by described base station selected and RRC signaling by the via node special use, give described via node; The mode of perhaps by described base station, with MAC, controlling cell sends to described via node together with the UE data-reusing.
Described base station is further used for, the data re-transmission time of using while retransmitting according to described downlink data, retransmit to occur the time be engraved on PDCCH and send DL Assignment to described UE, and the RV used while retransmitting according to described downlink data sequentially arranges the RV in DL Assignment; And the resource scheduling information in described DL Assignment except RV is identical while passing with data modulation coding mode and data are first.
Described via node is further used for, and in the same TTI with described DL Assignment transmission, the re-transmission of downlink data is carried out in collaborative described base station on identical resource; Perhaps carry out alone the re-transmission of downlink data; And the RV of data retransmission is sequentially arranged according to the described RV consulted in advance.
Described via node is further used for, before the transmission data retransmission, if receive the new DL Assignment of described base station about the same HARQ process of described UE, interrupt the transmission of current data retransmission, and carry out the collaborative re-transmission of data according to described new DL Assignment.
Data transmission method and system under a kind of wireless relay scene provided by the present invention, by between Donor eNB and Relay, according to the RV order of agreement and the data re-transmission time of agreement, UE being carried out to the downlink data re-transmission, avoided between Donor eNB and Relay as data re-transmission scheduling of resource interactive information continually, save Un mouth control channel and data sharing channel resource, and reduced data transfer delay simultaneously.
The accompanying drawing explanation
Fig. 1 is the schematic network structure that comprises the Equations of The Second Kind via node in prior art;
The flow chart that Fig. 2 is the data transmission method under a kind of wireless relay scene of the present invention;
The data transmission method flow chart that Fig. 3 is the embodiment of the present invention one;
The data transmission method flow chart that Fig. 4 is the embodiment of the present invention two;
The data transmission method flow chart that Fig. 5 is the embodiment of the present invention three;
The data transmission method flow chart that Fig. 6 is the embodiment of the present invention four;
The data transmission method flow chart that Fig. 7 is the embodiment of the present invention five;
The composition structural representation that Fig. 8 is the data transmission system under a kind of wireless relay scene of the present invention.
Embodiment
Below in conjunction with the drawings and specific embodiments, the technical solution of the present invention is further elaborated.
Data transmission method under a kind of wireless relay scene provided by the present invention as shown in Figure 2, mainly comprises the following steps:
Step 201, Donor-eNB and Relay consult when downlink data retransmits RV order and the data re-transmission time of using in advance.
Relay of the present invention refers to the Equations of The Second Kind via node.RV and the data re-transmission time of consulting in advance, can stipulate by agreement; Also can be selected and the Radio Resource that passes through the Relay special use is controlled (RRC, Radio Resource Control) signaling to Relay by Donor-eNB; The mode that can also control cell with MAC by Donor-eNB sends to Relay together with the UE data-reusing.
Step 202, Donor-eNB and Relay, when knowing that the head that sends to UE passes data failure, RV order and the data re-transmission time of using while retransmitting according to the downlink data of consulting in advance, carry out the collaborative re-transmission of downlink data to UE.
The data re-transmission time of using while retransmitting according to downlink data sends DL Assignment to UE by Donor-eNB retransmitting the moment occurred on PDCCH, and the RV of use sequentially arranges the RV in DLAssignment while retransmitting according to downlink data; Resource scheduling information in DLAssignment except RV is identical while passing with data modulation coding mode and data are first.
In the same TTI with above-mentioned DL Assignment transmission, Donor-eNB and Relay carry out the collaborative re-transmission of downlink data on identical resource; Perhaps also can be carried out alone by Relay the re-transmission (Donor-eNB does not participate in the re-transmission of downlink data) of downlink data.The RV of data retransmission is sequentially arranged according to the RV consulted in advance.
In addition, if Relay received the new DL Assignment of Donor-eNB about the same HARQ process of UE before the transmission data retransmission, interrupt the transmission of current data retransmission, and carry out the collaborative re-transmission of data according to new DLAssignment.
After if data retransmission sends, Relay again listens to UE and receives the data retransmission failure, according to the next RV in the RV order of consulting in advance, again together with Donor-eNB, carry out the collaborative re-transmission of downlink data, until data re-transmission success or number of retransmissions reach default higher limit.
Below in conjunction with specific embodiment, the data transmission method under above-mentioned wireless relay scene is further described.
Embodiments of the invention one carry out the general operation flow process of data re-transmission in order to describe the data transmission method shown in application drawing 2, as shown in Figure 3, mainly comprise the following steps:
At first, suppose that the data re-transmission RV of Donor eNB and Relay agreement sequentially is followed successively by (0,2,3,1), this order is configured in Relay by the RRC signaling.The data re-transmission time of supposing Donor eNB and Relay agreement is the rear 4ms of NACK feedback that receives UE, and this time is also configured in Relay by the RRC signaling.
Step 301, Donor eNB need to carry out downlink data transmission to certain UE, and when Donor eNB has known that this UE is under Relay covers, in order to utilize Relay to carry out the data collaborative transmission, DonoreNB needs to send in advance the downlink data of UE to send to Relay, Donor eNB sends DL Assignment on PDCCH for this reason, and its corresponding C-RNTI is designated the Relay sign.
Step 302, with step 301 in the same TTI that sends of DLAssignment, Donor eNB is the UE downlink data, corresponding UE sign, the scheduling downlink resource information that UE be about to be used, and other necessary control informations are multiplexed with the Relay downlink data and send to Relay.
Step 303, after Relay success downlink data receiving, send the ACK of HARQ feedback to Donor eNB, confirm the data receiver success.
Step 304, after receiving the ACK 2ms of Relay, Donor eNB sends DL Assignment on PDCCH, its corresponding C-RNTI is designated the UE sign, and the resource scheduling information of indicating in DL Assignment scheduling downlink resource information relevant with the UE that sends to Relay in step 302 is identical, wherein RV=0.
Step 305, with step 304 in the same TTI that sends of DL Assignment, Donor eNB carries out the downlink data cooperative transmission to UE together with Relay on identical resource.This data transfer is the first biographies of data.
Step 306, UE can't successful downlink data receiving, to Donor eNB, sends the NACK response, and this NACK response is also listened to by Relay simultaneously.
Step 307, after receiving the NACK response 4ms of UE, Donor eNB sends DL Assignment on PDCCH, the RV=2 wherein indicated, other resource scheduling information are identical while all passing with data are first with data modulation coding mode.
Step 308, with step 307 in the same TTI that sends of DLAssignment, Donor eNB carries out the downlink data cooperative transmission to UE together with Relay on identical resource.This data transfer is data re-transmission, and the RV of use is 2.
Step 309, UE receives the data retransmission successfully decoded, to Donor eNB, sends ACK, and this ACK is also listened to by Relay simultaneously, this DTD.
Embodiments of the invention two do not receive in the situation of NACK response of UE in order to be described in Donor eNB, and the data transmission method shown in application drawing 2 carries out the operating process of data re-transmission, as shown in Figure 4, mainly comprises the following steps:
At first, suppose that the data re-transmission RV of Donor eNB and Relay agreement sequentially is followed successively by (0,2,3,1), this order is configured in Relay by the RRC signaling.The data re-transmission time of supposing Donor eNB and Relay agreement is the rear 4ms of NACK feedback that receives UE, and this time is also configured in Relay by the RRC signaling.
Wherein, the operation of step 401～405 is identical with the operation of step 301～305 in embodiment illustrated in fig. 3, repeats no more herein.
Step 406, UE can't successful downlink data receiving, to Donor eNB, sends the NACK response, however for a certain reason, this NACK response is not received by Donor eNB, but is successfully received by Relay.
Step 407, due to any feedback that does not receive UE, Donor eNB thinks that first biography of data do not have success, log-on data retransmission processes.Donor eNB sends DL Assignment on PDCCH, the RV=2 wherein indicated, and other resource scheduling information are identical while all passing with data are first with data modulation coding mode.
Step 408, with step 407 in the same TTI that sends of DL Assignment, Donor eNB carries out the downlink data cooperative transmission to UE together with Relay on identical resource.This data transfer is data re-transmission, and the RV of use is 2.
Step 409, UE receives the data retransmission successfully decoded, to Donor eNB, sends ACK, and this ACK is also listened to by Relay simultaneously, this DTD.
Embodiments of the invention three, in order to describe the data transmission method shown in application drawing 2, complete alone data re-transmission by Relay, and Donor eNB does not participate in the flow process that data send, and as shown in Figure 5, mainly comprises the following steps:
At first, suppose that the data re-transmission RV of Donor eNB and Relay agreement sequentially is followed successively by (0,2,3,1), this order is configured in Relay by the RRC signaling.The data re-transmission time of supposing Donor eNB and Relay agreement is the rear 4ms of NACK feedback that receives UE, and this time is also configured in Relay by the RRC signaling.
Wherein, the operation of step 501～506 is identical with the operation of step 301～306 in embodiment illustrated in fig. 3, repeats no more herein.
Step 507, after receiving the NACK response 4ms of UE, Donor eNB sends DL Assignment on PDCCH, the RV=2 wherein indicated, other resource scheduling information are identical while all passing with data are first with data modulation coding mode.
Step 508, with step 507 in the same TTI that sends of DL Assignment, Relay carries out alone the re-transmission of downlink data, and Donor eNB does not participate in data and sends.The data RV of Relay transmission is 2.
Step 509, UE receives the data retransmission successfully decoded, to Donor eNB, sends ACK, and this ACK is also listened to by Relay simultaneously, this DTD.
The embodiments of the invention four-function is to describe the data transmission method shown in application drawing 2, and Relay receives the situation of Donor eNB new DL Assignment to the same HARQ process of same UE before sending data retransmission.As shown in Figure 6, mainly comprise the following steps:
At first, suppose that the data re-transmission RV of Donor eNB and Relay agreement sequentially is followed successively by (0,2,3,1), this order is configured in Relay by the RRC signaling.The data re-transmission time of supposing Donor eNB and Relay agreement is the rear 4ms of NACK feedback that receives UE, and this time is also configured in Relay by the RRC signaling.
Wherein, the operation of step 601～606 is identical with the operation of step 301～306 in embodiment illustrated in fig. 3, repeats no more herein.
Step 608, Relay receives the downlink data from Donor eNB, comprise the new schedule information for the same HARQ process of same UE in data, Relay stops a data retransmission processes, beginning is according to new schedule information and the transmission of Donor eNB synergistic data, the data of transmission may be new data, may be also the data retransmission of upper data, but scheduling of resource or modulation coding mode etc. change.
Embodiments of the invention five receive the first biography of UE data in order to describe Relay with listening mode, and do not participate in the first situation about passing of UE number, and the flow process of data transmission method shown in application drawing 2 as shown in Figure 7, mainly comprises the following steps:
At first, suppose that the data re-transmission RV of Donor eNB and Relay agreement sequentially is followed successively by (0,2,3,1), this order is configured in Relay by the RRC signaling.The data re-transmission time of supposing Donor eNB and Relay agreement is the rear 4ms of NACK feedback that receives UE, and this time is also configured in Relay by the RRC signaling.
Step 702, Donor eNB sends the downlink data (the first biography) of UE on PDCCH; Because Relay has obtained the down dispatch information for this UE, so Relay also can be received and be preserved the UE downlink data on PDSCH.
For realizing the method for above-mentioned transfer of data, the present invention also provides the data transmission system under a kind of wireless relay scene, and as shown in Figure 8, this system comprises: base station 10 and via node 20.Base station 10, for with via node 20, consulting in advance when downlink data retransmits RV order and the data re-transmission time of using, and when knowing that the head that sends to UE passes data failure, RV order and the data re-transmission time of while retransmitting according to the downlink data of consulting in advance, using, 20 couples of UE of cooperative relaying node carry out the re-transmission of downlink data.Via node 20, for with base station 10, consulting in advance when downlink data retransmits RV order and the data re-transmission time of using, and when knowing that the head that sends to UE passes data failure, RV order and the data re-transmission time of while retransmitting according to the downlink data of consulting in advance, using, collaborative 10 pairs of base stations UE carries out the re-transmission of downlink data.
Wherein, RV and the data re-transmission time of consulting in advance, by agreement, stipulate; The RRC signaling of perhaps by base station 10, being selected and passing through via node 20 special uses is to via node 20; The mode of perhaps by base station 10, with MAC, controlling cell sends to via node 20 together with the UE data-reusing.
Via node 20 is further used for, and in the same TTI with DL Assignment transmission, the re-transmission of downlink data is carried out in collaborative base station 10 on identical resource; Perhaps carry out alone the re-transmission of downlink data; And the RV of data retransmission is sequentially arranged according to the RV consulted in advance.In addition, before the transmission data retransmission, if via node 20 is received the new DLAssignment of base station 10 about the same HARQ process of UE, interrupt the transmission of current data retransmission, and carry out the collaborative re-transmission of data according to new DL Assignment.
In sum, the present invention by carrying out the downlink data re-transmission according to the RV order of agreement and the data re-transmission time of agreement to UE between base station and via node, avoided between base station and via node as data re-transmission scheduling of resource interactive information continually, save Un mouth control channel and data sharing channel resource, and reduced data transfer delay simultaneously.
The above, be only preferred embodiment of the present invention, is not intended to limit protection scope of the present invention.
Claims (6)
1. the data transmission method under a wireless relay scene, is characterized in that, the method comprises:
Base station (Donor-eNB) and via node (Relay) are consulted when downlink data retransmits redundancy versions (RV) order and the data re-transmission time of using in advance; Described Donor-eNB and Relay, when knowing that the head that sends to user terminal (UE) passes data failure, RV order and the data re-transmission time of using while retransmitting according to the downlink data of consulting in advance, carry out the collaborative re-transmission of downlink data to described UE;
Wherein, the described collaborative re-transmission that UE is carried out to downlink data comprises:
The data re-transmission time of using while retransmitting according to described downlink data, to described UE send scheduling downlink resource instruction DL Assignment by described Donor-eNB Physical Downlink Control Channel (PDCCH) is upper in the moment retransmit occurred, and the RV used while retransmitting according to described downlink data sequentially arranges the RV in DL Assignment; Resource scheduling information in described DL Assignment except RV is identical while passing with data modulation coding mode and data are first;
In the same Transmission Time Interval (TTI) with described DL Assignment transmission, collaborative re-transmission or described Relay that described Donor-eNB and Relay carry out downlink data on identical resource carry out alone the re-transmission of downlink data, and the RV of data retransmission is sequentially arranged according to the described RV consulted in advance.
2. the data transmission method under the wireless relay scene according to claim 1, is characterized in that, described RV and the data re-transmission time of consulting in advance, by agreement, stipulates; The Radio Resource of perhaps by described Donor-eNB, being selected and passing through the Relay special use is controlled (RRC) signaling to described Relay; The mode of perhaps by described Donor-eNB, with media access control MAC, controlling cell sends to described Relay together with the UE data-reusing.
3. according to the data transmission method under the described wireless relay scene of claim 1 or 2, it is characterized in that, the method further comprises: if described Relay is before the transmission data retransmission, receive the new DL Assignment of described Donor-eNB about same mixed automatic retransfer request (HARQ) process of described UE, interrupt the transmission of current data retransmission, and carry out the collaborative re-transmission of data according to described new DL Assignment.
4. the data transmission system under a wireless relay scene, is characterized in that, this system comprises: base station and via node, wherein,
Described base station, for with described via node, consulting in advance when downlink data retransmits RV order and the data re-transmission time of using, and when knowing that the head that sends to UE passes data failure, RV order and the data re-transmission time of while retransmitting according to the downlink data of consulting in advance, using, collaborative described via node carries out the re-transmission of downlink data to UE; Comprise: the data re-transmission time of using while retransmitting according to described downlink data, retransmit occur the time be engraved on PDCCH and send DL Assignment to described UE, and the RV used while retransmitting according to described downlink data sequentially arranges the RV in DL Assignment; And the resource scheduling information in described DL Assignment except RV is identical while passing with data modulation coding mode and data are first;
Described via node, for with described base station, consulting in advance when downlink data retransmits RV order and the data re-transmission time of using, and when knowing that the head that sends to UE passes data failure, RV order and the data re-transmission time of while retransmitting according to the downlink data of consulting in advance, using, the re-transmission of downlink data is carried out in collaborative described base station to UE; Comprise: in the same TTI with described DL Assignment transmission, collaborative described base station is carried out the re-transmission of downlink data or carries out alone the re-transmission of downlink data on identical resource, and the RV of data retransmission is sequentially arranged according to the described RV consulted in advance.
5. the data transmission system under the wireless relay scene according to claim 4, is characterized in that, described RV and the data re-transmission time of consulting in advance, by agreement, stipulates; Perhaps by described base station selected and RRC signaling by the via node special use, give described via node; The mode of perhaps by described base station, with MAC, controlling cell sends to described via node together with the UE data-reusing.
6. according to the data transmission system under the described wireless relay scene of claim 4 or 5, it is characterized in that, described via node is further used for, before the transmission data retransmission, if receive the new DL Assignment of described base station about the same HARQ process of described UE, interrupt the transmission of current data retransmission, and carry out the collaborative re-transmission of data according to described new DL Assignment.
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