CN102035632A - 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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- CN102035632A CN102035632A CN2009100931657A CN200910093165A CN102035632A CN 102035632 A CN102035632 A CN 102035632A CN 2009100931657 A CN2009100931657 A CN 2009100931657A CN 200910093165 A CN200910093165 A CN 200910093165A CN 102035632 A CN102035632 A CN 102035632A
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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 satisfy the demand that growing big bandwidth high-speed mobile inserts, third generation partner program (3GPP, Third Generation Partnership Projects) at Long Term Evolution (LTE, Long Term Evolution) releases senior Long Term Evolution (LTE-Advanced, Long Term Evolution advance) standard on the basis of system.LTE-Advanced is the evolution to the LTE technology, and the core that it has kept the LTE technology adopts series of new techniques to realize improving 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 among the LTE-Advanced, is intended to the coverage of Extended Cell, reduces the blind spot area in the 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, promptly between original base station (Donor-eNB) and UE, increase some new via node (RN, Relay-Node), by wireless connections, and there is not wired connection between the transmission network between RN that these are newly-increased and the Donor-eNB.Wherein, the air interface between Donor-eNB and the RN is called the Un mouth, and Radio Link is called back haul link (backhaul link); Air interface between RN and the UE is called the Uu mouth, and link is called access link (access link).Downlink data arrives Donor-eNB earlier, and then passes to RN, and RN transfers to UE again, otherwise then up.
Via node has different implementations and sorting technique, for example: transmitting according to wireless data is at physics (PHY, Physical) layer (also claiming the L1 layer), still at medium access control (MAC, Medium Access Control) layer (also claiming the L2 layer) can be divided into L1 via node or L2 via node to via node; Whether use identical frequency can be divided into (In-band) via node or outer (Out-of-band) via node of band in the band according to back haul link and access link.In the research of present 3GPP, realize feasibility according to networking demand in the future and technology, mainly defined two kinds of via node types, be referred to as first kind via node (Type I Relay) and the second class via node (Type II Relay) respectively.
First kind via node has the Physical Cell Identifier (PCI of self, Physical Cell Identificaiton), have control channel and the data channel that is independent of Donor eNB in provisional capital up and down, the UE of first kind via node under it covers is a new eNB.Be moved to Donor eNB and cover the process that need switch of following time when UE covers from first kind via node.First kind via node is mainly used in cover to be expanded, perhaps to the covering of blind spot, hot zones.
The second class via node does not have the PCI of self, the control channel that does not also have self, UE under it covers still needs to receive resource scheduling information and other control informations from Donor eNB, and the second class via node mainly is to assist DeNB UE to be carried out the collaborative transmission of up-downgoing data.The UE of the second class via node under it covers is transparent substantially, and UE still thinks it oneself is to be under the covering of Donor eNB sub-district, and UE covers to be moved under the Donor eNB covering from the second class via node not to be needed to switch yet.The application scenarios of the second class via node mainly is to realize uniting covering (Overlapped Coverage) with DeNB, as shown in Figure 1.
The second class via node is usually finished transfer of data to UE with Donor eNB in (cooperative) mode of working in coordination with.So-called collaborative, be meant Donor eNB and the second class via node on the identical moment and identical resource to the identical data of UE transmissions/receptions, gain the success rate of increase transfer of data thereby form transmission diversity.Typical working method is: Donor eNB is defeated by the second class via node with the UE downlink data in the Un oral instructions, and this process is transparent to UE; Donor eNB and the second class via node are united transfer of data in the identical moment and identical resource coordinating to UE.
Because Un uses identical frequency with the Uu mouth, the second class via node can not receive Donor eNB downlink data and send downlink data at the Uu mouth to UE at the Un mouth simultaneously, perhaps sends upstream data and receives the upstream data that UE sends at the Uu mouth to Donor eNB 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 still uses with similar dynamic dispatching of LTE and mixing automatic repeat requests (HARQ, Hybrid Automatic Repeat reQuest) mechanism at the Un mouth and finishes the scheduling of resource of RN and transfer of data.Dynamic dispatching is meant, Donor eNB can pass through Physical Downlink Control Channel (PDCCH, Physical Downlink Control Channel) sub-district-Radio Network Temporary Identifier (C-RNTI on, Cell Radio Network Temporary Identifier) at each Transmission Time Interval (TTI, Transmit Time Interval), 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 is that possible resource allocation is found in descending reception.When being used for descending scheduling, carries PDCCH the downlink resource assignment information, main contents comprise Resource Block RB assignment information, transformat (TF, Transport Format) or MCS, HARQ information, transmission power control (TPC, Transmit Power Control) information, RNTI/ cyclic redundancy check (CRC) information such as (CRC, Cyclical Redundancy Check).RN sends affirmation/non-affirmation (ACK/NACK) response message of feedback HARQ to downlink data by Physical Uplink Control Channel (PUCCH, Physical Uplink Control Channel).
Modes such as HARQ function employing N road concurrent process send and retransmit transmission block (TB, Transport Block) between L1 layer peer-entities, are used to improve the reliability that transmission block successfully sends.These HARQ processes and HARQ entity are associated, and the HARQ entity retransmits in the asynchronous self adaptation of descending support, refer to need dispatch by the control channel of L1/L2 layer the opportunity that retransmits, and can use and first different Radio Resources, the MCS etc. of passing.In the LTE system, the control channel of L1/L2 layer refers to PDCCH.HARQ head sends the initial redundancy version (RV of transmission block when passing, Redundancy Version), when retransmitting, HARQ sends other redundancy versions of transmission block, HARQ is first to be passed and the same HARQ process of HARQ re-transmission use, and receiving terminal is carried out soft union operation at the redundancy versions of the re-transmission that this HARQ process buffering area will receive with the redundancy versions that the head that receives passes.HARQ Loop Round Trip Time (HARQ RTT, HARQ Round Trip Time) refers to the shortest time interval between first biography of HARQ and the HARQ re-transmission, and after HARQ head passed, the HARQ re-transmission will just can be scheduled after the HARQ RTT time at least.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 indicate the HARQ process identification (PID) to use which HARQ process to handle corresponding transmission block by PDCCH to specify UE.
In the working method of the above-mentioned second class via node, when if the Donor eNB and the second class via node need to retransmit to the first biography failure of the downlink data of UE, retransmit mode according to the asynchronous self adaptation of traditional downlink data, Donor eNB need send the scheduling downlink resource instruction (DL Assignment) that is used for the data retransmission scheduling of resource on PDCCH, the downlink resource that in DL Assignment, is used for data retransmission except indication, outside the new information such as modulation coding mode, also need to comprise RV number of data retransmission.In order when retransmitting, also to utilize the second class via node to work in coordination with transmission, above-mentioned data retransmission schedule information also need be notified the second class via node by Donor eNB before retransmitting generation, the limited resources that Donor eNB that produces owing to data re-transmission and the information interaction between the second class via node have not only taken the Un mouth have 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, takies Un mouth resource to solve downlink data re-transmission of the prior art, 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, this method comprises:
Redundancy versions (RV) order and data re-transmission time that base station (Donor-eNB) and via node (Relay) use when consulting the downlink data re-transmission in advance;
Described Donor-eNB and Relay the RV order and the data re-transmission time of using when retransmitting according to the downlink data of consulting in advance, carry out the collaborative re-transmission of downlink data to described UE when knowing that the head that sends to user terminal (UE) passes data failure.
Described RV and the data re-transmission time of consulting in advance, stipulate by agreement; Perhaps give described Relay by described Donor-eNB selection and by Radio Resource control (RRC) signaling of Relay special use; Perhaps mode and the UE data multiplex of controlling cell with media access control MAC by described Donor-eNB sends to described Relay together.
The described collaborative re-transmission that UE is carried out downlink data is specially:
The data re-transmission time of using when retransmitting according to described downlink data, go up to described UE at Physical Downlink Control Channel (PDCCH) by described Donor-eNB in the moment of retransmit taking place and to send scheduling downlink resource instruction DL Assignment, and the RV that uses when retransmitting according to described downlink data is provided with the RV among the DL Assignment in proper order; Resource scheduling information among the described DL Assignment except that RV is identical when passing with data modulation coding mode and data are first;
In the same Transmission Time Interval (TTI) that sends with described DL Assignment, described Donor-eNB carries out the collaborative re-transmission of downlink data with Relay on identical resource, and the RV of data retransmission is provided with in proper order according to the described RV that consults in advance.
The described collaborative re-transmission that UE is carried out downlink data is specially:
The data re-transmission time of using when retransmitting according to described downlink data, on PDCCH, send DL Assignment by described Donor-eNB in the moment of retransmit taking place, and the RV that uses when retransmitting according to described downlink data is provided with the RV among the DL Assignment in proper order to described UE; Resource scheduling information among the described DL Assignment except that RV is identical when passing with data modulation coding mode and data are first;
In the same TTI that sends with described DL Assignment, described Relay carries out the re-transmission of downlink data alone, and the RV of data retransmission is provided with in proper order according to the described RV that consults in advance.
This method further comprises: if described Relay is before the transmission data retransmission, receive the new DL Assignment of described Donor-eNB about the automatic repeat requests of same mixing (HARQ) process of described UE, then 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, be used for the RV order and data re-transmission time of using when consulting downlink data in advance and retransmit with described via node, and when knowing that the head that sends to UE passes data failure, the RV order and the data re-transmission time of using when retransmitting according to the downlink data of consulting in advance, collaborative described via node carries out the re-transmission of downlink data to UE;
Described via node, be used for the RV order and data re-transmission time of using when consulting downlink data in advance and retransmit with described base station, and when knowing that the head that sends to UE passes data failure, the RV order and the data re-transmission time of using when retransmitting according to the downlink data of consulting in advance, 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, stipulate by agreement; Perhaps give described via node by described RRC signaling base station selected and by the via node special use; Perhaps send to described via node with mode and the UE data multiplex that MAC controls cell by described base station together.
Described base station is further used for, the data re-transmission time of using when retransmitting according to described downlink data, when retransmit taking place, be engraved on the PDCCH and send DL Assignment, and the RV that uses when retransmitting according to described downlink data is provided with the RV among the DL Assignment in proper order to described UE; And the resource scheduling information among the described DL Assignment except that RV is identical when passing with data modulation coding mode and data are first.
Described via node is further used for, and in the same TTI that sends with described DL Assignment, the re-transmission of downlink data is carried out in collaborative described base station on identical resource; Perhaps carry out the re-transmission of downlink data alone; And the RV of data retransmission is provided with in proper order according to the described RV that consults in advance.
Described via node is further used for, before the transmission data retransmission, if receive the new DLAssignment of described base station, then interrupt the transmission of current data retransmission, and carry out the collaborative re-transmission of data according to described new DL Assignment about the same HARQ process of described UE.
Data transmission method and system under a kind of wireless relay scene provided by the present invention, UE is carried out downlink data retransmit by by appointment RV order and data re-transmission time of agreement between Donor eNB and Relay, avoided between Donor eNB and Relay being 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.
Description of drawings
Fig. 1 is for comprising the schematic network structure of the second class via node in the prior art;
Fig. 2 is the flow chart of the data transmission method under a kind of wireless relay scene of the present invention;
Fig. 3 is the data transmission method flow chart of the embodiment of the invention one;
Fig. 4 is the data transmission method flow chart of the embodiment of the invention two;
Fig. 5 is the data transmission method flow chart of the embodiment of the invention three;
Fig. 6 is the data transmission method flow chart of the embodiment of the invention four;
Fig. 7 is the data transmission method flow chart of the embodiment of the invention five;
Fig. 8 is the composition structural representation of the data transmission system under a kind of wireless relay scene of the present invention.
Embodiment
The technical solution of the present invention is further elaborated below in conjunction with the drawings and specific embodiments.
Data transmission method under a kind of wireless relay scene provided by the present invention as shown in Figure 2, mainly may further comprise the steps:
Relay of the present invention is meant the second class via node.In advance RV of Xie Shanging and data re-transmission time, can stipulate by agreement; Also can give Relay by the Donor-eNB selection and by Radio Resource control (RRC, Radio Resource Control) signaling of Relay special use; Can also send to Relay with mode and the UE data multiplex that MAC controls cell by Donor-eNB together.
The data re-transmission time of using when retransmitting according to downlink data sends DL Assignment to UE by Donor-eNB retransmitting the moment of taking place on PDCCH, and the RV of use is provided with RV among the DLAssignment in proper order when retransmitting according to downlink data; Resource scheduling information among the DLAssignment except that RV is identical when passing with data modulation coding mode and data are first.
In the same TTI that sends with above-mentioned DL Assignment, Donor-eNB carries out the collaborative re-transmission of downlink data with Relay on identical resource; Perhaps also can carry out the re-transmission (Donor-eNB does not participate in the re-transmission of downlink data) of downlink data alone by Relay.The RV of data retransmission is provided with in proper order according to the RV that consults 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, then interrupt the transmission of current data retransmission, and carry out the collaborative re-transmission of data according to new DL Assignment.
After if data retransmission sends, Relay listens to UE once more and receives the data retransmission failure, then carry out the collaborative re-transmission of downlink data once more with Donor-eNB, reach default higher limit up to data re-transmission success or number of retransmissions according to the next RV in the RV order of consulting in advance.
Below in conjunction with specific embodiment the data transmission method under the above-mentioned wireless relay scene is further described.
Embodiments of the invention one are used the general operation flow process that data transmission method shown in Figure 2 carries out data re-transmission in order to describe, and as shown in Figure 3, mainly may further comprise the steps:
At first, suppose that the data re-transmission RV of Donor eNB and Relay agreement is followed successively by (0,2,3,1) in proper order, this order obtains configuration by the RRC signaling in Relay.The data re-transmission time of supposing Donor eNB and Relay agreement is the NACK feedback back 4ms that receives UE, and should the time also obtain configuration by the RRC signaling in Relay.
Step 301, Donor eNB need carry out downlink data transmission to certain UE, and Donor eNB has known when this UE is under the Relay covering, in order to utilize Relay to carry out the data collaborative transmission, the downlink data that Donor eNB need will send to UE in advance sends 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 use, and other necessary control informations are multiplexed with the Relay downlink data and send to Relay.
Step 303 behind the Relay success downlink data receiving, to the ACK that Donor eNB sends the HARQ feedback, is confirmed the Data Receiving 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 relevant scheduling downlink resource information of the UE that sends to Relay in the resource scheduling information of indicating among the DL Assignment and the step 302 is identical, wherein RV=0.
Step 305, with step 304 in the same TTI that sends of DLAssignment, Donor eNB carries out the collaborative transmission of downlink data 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, sends the NACK response to Donor eNB, 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, Zhi Shi RV=2 wherein, other resource scheduling information are identical during all with data head biography with data modulation coding mode.
Step 308, with step 307 in the same TTI that sends of DLAssignment, Donor eNB carries out the collaborative transmission of downlink data to UE together with Relay on identical resource.This data transfer is a data re-transmission, and the RV of use is 2.
Step 309, UE receives data retransmission and decodes successfully, sends ACK to Donor eNB, and this ACK is also listened to this DTD simultaneously by Relay.
Embodiments of the invention two are used the operating process that data transmission method shown in Figure 2 carries out data re-transmission in order under the situation of NACK response that is described in Donor eNB and does not receive UE, as shown in Figure 4, mainly may further comprise the steps:
At first, suppose that the data re-transmission RV of Donor eNB and Relay agreement is followed successively by (0,2,3,1) in proper order, this order obtains configuration by the RRC signaling in Relay.The data re-transmission time of supposing Donor eNB and Relay agreement is the NACK feedback back 4ms that receives UE, and should the time also obtain configuration by the RRC signaling in Relay.
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, sends the NACK response to Donor eNB, however for a certain reason, this NACK response is not received by Donor eNB, but is successfully received by Relay.
Step 407, owing to do not receive any feedback of 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, Zhi Shi RV=2 wherein, and other resource scheduling information are identical when 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 collaborative transmission of downlink data to UE together with Relay on identical resource.This data transfer is a data re-transmission, and the RV of use is 2.
Step 409, UE receives data retransmission and decodes successfully, sends ACK to Donor eNB, and this ACK is also listened to this DTD simultaneously by Relay.
Embodiments of the invention three are used data transmission method shown in Figure 2 in order to describe, and finish data re-transmission alone by Relay, and Donor eNB does not participate in the flow process that data send, and as shown in Figure 5, mainly may further comprise the steps:
At first, suppose that the data re-transmission RV of Donor eNB and Relay agreement is followed successively by (0,2,3,1) in proper order, this order obtains configuration by the RRC signaling in Relay.The data re-transmission time of supposing Donor eNB and Relay agreement is the NACK feedback back 4ms that receives UE, and should the time also obtain configuration by the RRC signaling in Relay.
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 DLAssignment on PDCCH, Zhi Shi RV=2 wherein, other resource scheduling information are identical during all with data head biography with data modulation coding mode.
Step 508, with step 507 in the same TTI that sends of DL Assignment, Relay carries out the re-transmission of downlink data alone, and Donor eNB does not participate in data and sends.The data RV of Relay transmission is 2.
Step 509, UE receives data retransmission and decodes successfully, sends ACK to Donor eNB, and this ACK is also listened to this DTD simultaneously by Relay.
The embodiments of the invention four-function is used data transmission method shown in Figure 2 to describe, and Relay receives the situation of Donor eNB to the new DL Assignment of the same HARQ process of same UE before sending data retransmission.As shown in Figure 6, mainly may further comprise the steps:
At first, suppose that the data re-transmission RV of Donor eNB and Relay agreement is followed successively by (0,2,3,1) in proper order, this order obtains configuration by the RRC signaling in Relay.The data re-transmission time of supposing Donor eNB and Relay agreement is the NACK feedback back 4ms that receives UE, and should the time also obtain configuration by the RRC signaling in Relay.
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 607 before Relay begins to transmit data retransmission, receives the DL Assignment from Donor eNB.
Step 608, Relay receives the downlink data from Donor eNB, comprise new schedule information in the data for the same HARQ process of same UE, 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, also may be the data retransmission of last 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 under the first situation about passing of UE number, use the flow process of data transmission method shown in Figure 2, as shown in Figure 7, mainly may further comprise the steps:
At first, suppose that the data re-transmission RV of Donor eNB and Relay agreement is followed successively by (0,2,3,1) in proper order, this order obtains configuration by the RRC signaling in Relay.The data re-transmission time of supposing Donor eNB and Relay agreement is the NACK feedback back 4ms that receives UE, and should the time also obtain configuration by the RRC signaling in Relay.
Step 702, Donor eNB sends the downlink data (the first biography) of UE on PDCCH; Because Relay has obtained the down dispatch information at this UE, so Relay also can receive and preserve the UE downlink data on the PDSCH.
Step 703, UE sends the NACK response to descending first the taking defeat of data that pass to Donor eNB, and this NACK response is also listened to by Relay simultaneously.
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, be used for the RV order and data re-transmission time of using when consulting downlink data in advance and retransmit with via node 20, and when knowing that the head that sends to UE passes data failure, the RV order and the data re-transmission time of using when retransmitting according to the downlink data of consulting in advance, collaborative 20 couples of UE of via node carry out the re-transmission of downlink data.Via node 20, be used for the RV order and data re-transmission time of using when consulting downlink data in advance and retransmit with base station 10, and when knowing that the head that sends to UE passes data failure, the RV order and the data re-transmission time of using when retransmitting according to the downlink data of consulting in advance, collaborative 10 couples of UE in base station carry out the re-transmission of downlink data.
Wherein, in advance RV of Xie Shanging and data re-transmission time, stipulate by agreement; Perhaps give via node 20 by base station 10 selections and by the RRC signaling of via node 20 special uses; Perhaps send to via node 20 with mode and the UE data multiplex that MAC controls cell by base station 10 together.
Via node 20 is further used for, and in the same TTI that sends with DL Assignment, the re-transmission of downlink data is carried out in collaborative base station 10 on identical resource; Perhaps carry out the re-transmission of downlink data alone; And the RV of data retransmission is provided with in proper order according to the RV that consults in advance.In addition, before the transmission data retransmission, if via node 20 is received the new DL Assignment of base station 10 about the same HARQ process of UE, then 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 carried out downlink data to UE and retransmits by by appointment RV order and data re-transmission time of agreement between base station and via node, avoided between base station and via node being 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 is preferred embodiment of the present invention only, is not to be used to limit protection scope of the present invention.
Claims (10)
1. the data transmission method under the wireless relay scene is characterized in that this method comprises:
Redundancy versions (RV) order and data re-transmission time that base station (Donor-eNB) and via node (Relay) use when consulting the downlink data re-transmission in advance;
Described Donor-eNB and Relay the RV order and the data re-transmission time of using when retransmitting according to the downlink data of consulting in advance, carry out the collaborative re-transmission of downlink data to described UE when knowing that the head that sends to user terminal (UE) passes data failure.
2. according to the data transmission method under the described wireless relay scene of claim 1, it is characterized in that, described RV and the data re-transmission time of consulting in advance, stipulate by agreement; Perhaps give described Relay by described Donor-eNB selection and by Radio Resource control (RRC) signaling of Relay special use; Perhaps mode and the UE data multiplex of controlling cell with media access control MAC by described Donor-eNB sends to described Relay together.
3. according to the data transmission method under claim 1 or the 2 described wireless relay scenes, it is characterized in that the described collaborative re-transmission that UE is carried out downlink data is specially:
The data re-transmission time of using when retransmitting according to described downlink data, go up to described UE at Physical Downlink Control Channel (PDCCH) by described Donor-eNB in the moment of retransmit taking place and to send scheduling downlink resource instruction DL Assignment, and the RV that uses when retransmitting according to described downlink data is provided with the RV among the DL Assignment in proper order; Resource scheduling information among the described DL Assignment except that RV is identical when passing with data modulation coding mode and data are first;
In the same Transmission Time Interval (TTI) that sends with described DL Assignment, described Donor-eNB carries out the collaborative re-transmission of downlink data with Relay on identical resource, and the RV of data retransmission is provided with in proper order according to the described RV that consults in advance.
4. according to the data transmission method under claim 1 or the 2 described wireless relay scenes, it is characterized in that the described collaborative re-transmission that UE is carried out downlink data is specially:
The data re-transmission time of using when retransmitting according to described downlink data, on PDCCH, send DL Assignment by described Donor-eNB in the moment of retransmit taking place, and the RV that uses when retransmitting according to described downlink data is provided with the RV among the DL Assignment in proper order to described UE; Resource scheduling information among the described DL Assignment except that RV is identical when passing with data modulation coding mode and data are first;
In the same TTI that sends with described DL Assignment, described Relay carries out the re-transmission of downlink data alone, and the RV of data retransmission is provided with in proper order according to the described RV that consults in advance.
5. according to the data transmission method under claim 1 or the 2 described wireless relay scenes, it is characterized in that, this method further comprises: if described Relay is before the transmission data retransmission, receive the new DL Assignment of described Donor-eNB about the automatic repeat requests of same mixing (HARQ) process of described UE, then interrupt the transmission of current data retransmission, and carry out the collaborative re-transmission of data according to described new DLAssignment.
6. the data transmission system under the wireless relay scene is characterized in that this system comprises: base station and via node, wherein,
Described base station, be used for the RV order and data re-transmission time of using when consulting downlink data in advance and retransmit with described via node, and when knowing that the head that sends to UE passes data failure, the RV order and the data re-transmission time of using when retransmitting according to the downlink data of consulting in advance, collaborative described via node carries out the re-transmission of downlink data to UE;
Described via node, be used for the RV order and data re-transmission time of using when consulting downlink data in advance and retransmit with described base station, and when knowing that the head that sends to UE passes data failure, the RV order and the data re-transmission time of using when retransmitting according to the downlink data of consulting in advance, the re-transmission of downlink data is carried out in collaborative described base station to UE.
7. according to the data transmission system under the described wireless relay scene of claim 6, it is characterized in that, described RV and the data re-transmission time of consulting in advance, stipulate by agreement; Perhaps give described via node by described RRC signaling base station selected and by the via node special use; Perhaps send to described via node with mode and the UE data multiplex that MAC controls cell by described base station together.
8. according to the data transmission system under claim 6 or the 7 described wireless relay scenes, it is characterized in that, described base station is further used for, the data re-transmission time of using when retransmitting according to described downlink data, when retransmit taking place, be engraved on the PDCCH and send DL Assignment, and the RV that uses when retransmitting according to described downlink data is provided with the RV among the DL Assignment in proper order to described UE; And the resource scheduling information among the described DL Assignment except that RV is identical when passing with data modulation coding mode and data are first.
9. the data transmission system under the described according to Claim 8 wireless relay scene, it is characterized in that, described via node is further used for, and in the same TTI that sends with described DL Assignment, the re-transmission of downlink data is carried out in collaborative described base station on identical resource; Perhaps carry out the re-transmission of downlink data alone; And the RV of data retransmission is provided with in proper order according to the described RV that consults in advance.
10. according to the data transmission system under claim 6 or the 7 described wireless relay scenes, it is characterized in that, described via node is further used for, before the transmission data retransmission, if receive the new DLAssignment of described base station about the same HARQ process of described UE, then interrupt the transmission of current data retransmission, and carry out the collaborative re-transmission of data according to described new DLAssignment.
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| CN101064547B (en) * | 2006-04-27 | 2010-11-03 | 上海贝尔阿尔卡特股份有限公司 | Relay method of wireless access system and its base station, repeater facility and relay system |
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| WO2016161784A1 (en) * | 2015-04-10 | 2016-10-13 | 中兴通讯股份有限公司 | Method and device for reducing message congestion in lmp |
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| CN108347623A (en) * | 2017-01-23 | 2018-07-31 | 北京新唐思创教育科技有限公司 | Generation method, device and the online live broadcast system of online live content |
| CN111386666A (en) * | 2017-11-08 | 2020-07-07 | 高通股份有限公司 | Enhanced Internet of things relay data retransmission |
| US11811485B2 (en) | 2017-11-08 | 2023-11-07 | Qualcomm Incorporated | Enhanced internet of things relay data re-transmission |
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