CN101873609B - Data transmission method and device for relay system - Google Patents
Data transmission method and device for relay system Download PDFInfo
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- CN101873609B CN101873609B CN 200910083065 CN200910083065A CN101873609B CN 101873609 B CN101873609 B CN 101873609B CN 200910083065 CN200910083065 CN 200910083065 CN 200910083065 A CN200910083065 A CN 200910083065A CN 101873609 B CN101873609 B CN 101873609B
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- 238000007493 shaping process Methods 0.000 claims description 36
- 238000012546 transfer Methods 0.000 description 19
- 238000012545 processing Methods 0.000 description 4
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/24—Radio transmission systems, i.e. using radiation field for communication between two or more posts
- H04B7/26—Radio transmission systems, i.e. using radiation field for communication between two or more posts at least one of which is mobile
- H04B7/2603—Arrangements for wireless physical layer control
- H04B7/2606—Arrangements for base station coverage control, e.g. by using relays in tunnels
Abstract
The invention discloses a data transmission method for a relay system, which comprises: sending corresponding scheduling information of PDSCH data to the UE of a type-II relay service through a PDCCH; performing preset beamforming treatment of the PDSCH data and sending the processed PDSCH data and the corresponding special pilot frequency for the beamforming treatment to the UE; and allowing an eNB to send a common reference signal (CRS) used for demodulating the PDCCH to the UE directly, wherein a type-II relay does not send the CRS to the UE. Meanwhile, the invention also discloses the specific structure of the eNB and the type-II relay. When the method and the device are used, specific data transmission can be realized in a system into which the type-II relay is introduced.
Description
Technical field
The present invention relates to the relaying technique in the communication system, particularly data transmission method for uplink and the device in a kind of relay system.
Background technology
In the LTE-A system, introduced via node (Relay Node, RN) in order to improve throughput of system and to increase network coverage, be designated hereinafter simply as relaying.The network configuration of the LTE-A system of concrete introducing via node as shown in Figure 1.
Wherein, eNB links core net (CN) by wireline interface, and RN links eNB by wave point, and UE links RN or eNB by wave point.RN and eNB all can be for UE provide service, and the UE of RN service is called relaying UE (R-UE), and the eNB directly UE of service is called grand UE.
Have two types for relaying at present, namely Class1 and type 2 have provided the definition of type 2 among the LTE-A.Particularly, type 2 relayings do not have independent residential quarter ID, do not create any new residential quarter, can be R8 UE service; And at least for R8 UE, type 2 relayings are transparent, are higher than 8 UE for version, and the relaying of type 2 preferably also is transparent.
Although LTE-A has provided the above-mentioned definition of type 2, not to out-trunk and eNB and with concrete data transfer mode and the flow process of UE.
Summary of the invention
In view of this, the invention provides data transmission method for uplink and device in a kind of relay system, can in the system that introduces type 2 relayings, realize concrete transfer of data.
For achieving the above object, the present invention adopts following technical scheme:
Data transmission method for uplink in a kind of relay system comprises:
ENB sends at least one relaying of serving described UE with the PDSCH data of a UE and the corresponding schedule information thereof of giving to be sent;
ENB directly sends to described UE with the PDCCH of public reference signal CRS and the corresponding schedule information of the described PDSCH data of carrying.
Preferably, eNB to the mode that described relaying sends described PDSCH data and corresponding schedule information thereof is: at current descending time slot, the PDSCH data that next descending time slot need to be sent to described UE send to described relaying, described PDSCH data are sent to described relaying in the schedule information of this descending time slot by PDCCH, described PDSCH data are sent to described relaying in the schedule information of next descending time slot by PDCCH or PDSCH;
ENB to the mode that described UE sends the corresponding schedule information of described PDSCH data is: at described next descending time slot, described eNB directly sends to described UE in the schedule information of described next descending time slot by PDCCH with described PDSCH data.
Preferably, eNB to the mode that described relaying sends described PDSCH data and corresponding schedule information thereof is: at current descending time slot, described eNB sends to described relaying with the PDSCH data that next descending time slot need to send to described UE, described PDSCH data are sent to described relaying in the schedule information of this descending time slot by PDCCH, and the schedule information that rear N descending time slot in this frame need to be sent to PDSCH data rear N descending time slot in this frame of relaying sends to described relaying by PDCCH or PDSCH; Any one descending time slot n in rear N the descending time slot in this frame, eNB sends to described relaying with the PDSCH data that described descending time slot n+1 need to send to described UE;
ENB to the mode that described UE sends the corresponding schedule information of described PDSCH data is: any one the descending time slot n in rear N the descending time slot in this frame, described eNB need to send to the PDSCH data of UE in the schedule information of descending time slot n with descending time slot n, directly sends to described UE by PDCCH.
Preferably, the method further comprises: PDSCH data that eNB will transmit first and process corresponding dedicated pilot with described beam shaping directly send to described UE.
Preferably, the descending time slot that sends first in described PDSCH data, described eNB is with described PDSCH data and in the schedule information of this descending time slot, directly send to described UE and described relaying, and described dedicated pilot directly sent to described UE, the schedule information of described PDSCH data on the descending time slot that retransmits described PDSCH data sent to described relaying by PDCCH or PDSCH.
Preferably, the method further comprises: described eNB receives the information of the PDSCH data demodulates failure of described UE feedback, and after this information of reception, PDSCH data and dedicated pilot that needs are retransmitted send to described UE.
Preferably, the descending time slot that sends first in described PDSCH data, described eNB is with described PDSCH data and in the schedule information of this descending time slot, directly send to described UE and described relaying, and described dedicated pilot directly sent to described UE, the schedule information of described PDSCH data on the descending time slot that retransmits described PDSCH data sent to described relaying by PDCCH or PDSCH;
On the descending time slot that retransmits described PDSCH data, the described PDSCH data that described eNB will transmit first directly send to described UE in the schedule information of this descending time slot by PDCCH; Described PDSCH data and described dedicated pilot that described eNB will retransmit send to described UE.
Data transmission method for uplink in a kind of relay system comprises:
The PDSCH data that relay reception eNB sends and corresponding schedule information thereof, and according to described schedule information, the described PDSCH data of dedicated pilot and reception are sent to the UE of described relay services; Wherein, the PDSCH data that send to described UE are processed through default beam shaping, and described dedicated pilot is to process corresponding pilot frequency information with described beam shaping;
Described relaying does not send public reference signal CRS to described UE.
Preferably, relaying from the mode that described eNB receives PDSCH data and corresponding schedule information thereof is: in current time slots, and described PDSCH data of described relay reception and in the schedule information of this descending time slot;
Relaying comprises to the mode that described UE issues PDSCH data and dedicated pilot: at next descending time slot of described current time slots, described relaying is given described UE with the PDSCH data retransmission of described current descending time slot reception, and described dedicated pilot is sent to described UE.
Preferably, relaying from the mode that described eNB receives PDSCH data and corresponding schedule information thereof is: at current descending time slot, receive the PDSCH data that next descending time slot need to send to described UE, reception utilizes the described PDSCH data of PDCCH carrying in the schedule information of this descending time slot; And the PDSCH data that send to self after receiving in this frame in N descending time slot rear schedule information of N descending time slot in this frame; Any one descending time slot n in rear N the descending time slot in this frame receives the PDSCH data that described descending time slot n+1 need to send to described UE;
Relaying comprises to the mode that described UE issues PDSCH data and dedicated pilot: any one the descending time slot n in rear N the descending time slot in this frame, described relaying is given described UE with the PDSCH data retransmission of descending time slot n-1 reception, and described dedicated pilot is sent to described UE.
Preferably, described relay reception is carried out the operation that sends PDSCH data and DRS to described UE behind the demodulation failure information of described UE feedback.
ENB in a kind of relay system comprises:
Relay interface unit is used for the PDSCH data to relaying institute of system service UE to be sent are sent to described relaying, and send and the corresponding schedule information of described PDSCH data to described relaying by PDCCH;
The UE interface unit is used for sending and the corresponding schedule information of described PDSCH data to described UE by PDCCH, and sends public reference signal CRS to described UE.
Preferably, described relay interface unit is further used for issuing described PDSCH data and described schedule information to a plurality of relayings of the described UE of service.
Preferably, described UE interface unit when sending described PDSCH data first, is further used for described PDSCH data, sends to described UE with the corresponding schedule information of described PDSCH data and dedicated pilot DRS.
Preferably, described UE interface unit, be further used for receiving the information of the described PDSCH data demodulates failure of described UE feedback, and after this information of reception, be used for described PDSCH data, again send to described UE with the corresponding schedule information of described PDSCH data and described DRS.
Relaying in a kind of relay system comprises:
The eNB interface unit, be used for to receive the PDSCH data that the eNB that links to each other with self issues and carry by PDCCH with the corresponding schedule information of these PDSCH data;
The UE interface unit, the PDSCH data and the dedicated pilot DRS that are used for receiving send to the UE that self serves, and do not send public reference signal CRS to described UE; Wherein, described PDSCH data are processed through default beam shaping, and described dedicated pilot is to process corresponding pilot frequency information with described beam shaping.
Preferably, described UE interface unit, be further used for receiving the information of the described PDSCH data demodulates failure of described UE feedback, and after this information of reception, be used for described PDSCH data, again send to described UE with the corresponding schedule information of described PDSCH data and described DRS.
As seen from the above technical solution, among the present invention, eNB sends to Physical Downlink Shared Channel (PDSCH) data of type 2 relayings institute service UE (being designated hereinafter simply as type 2R-UE) with needs, and use pattern 2 relay forwardings are to type 2R-UE; Simultaneously, eNB directly sends public reference signal (CRS) to UE, and type 2 relayings do not send CRS to type 2R-UE, to avoid the interference to grand UE; For guaranteeing that UE is to the demodulation of PDSCH data, type 2R-UE is set is operated in transmission mode 7 times, eNB carries out and the corresponding beam shaping of this transmission mode the PDSCH data, and use pattern 2 relayings will be handed down to type 2R-UE with the corresponding dedicated pilot of this beam shaping (DRS).Like this, namely can realize the transfer of data between type 2 relayings and type 2R-UE and the eNB, and effectively control the interference to grand UE.
Description of drawings
Fig. 1 is the schematic network structure of the LTE-A system of introducing via node.
Embodiment
For making purpose of the present invention, technological means and advantage clearer, below in conjunction with accompanying drawing the present invention is described in further details.
In the LTE-A system, downlink service data transmits at channel PDSCH, and therefore, the lower business datum that below will be carried on the upper transmission of PDSCH is called the PDSCH data.To corresponding schedule information should be arranged, utilize PDCCH to carry these schedule informations in the PDSCH data of each descending time slot transmission, therefore, need to determine the bearing mode that the PDSCH data are concrete according to the schedule information of the upper carrying of PDCCH.The demodulation of the upper schedule information of PDCCH need to be carried out according to public reference signal (CRS).In sum, if UE needs the correct PDSCH of reception data, at first need to receive CRS, utilize this CRS that the schedule information on the PDCCH is carried out demodulation, then determine the bearing mode of PDSCH data, again to the PDSCH data demodulates.
The PDSCH data that grand UE issues eNB are carried out demodulation also to be needed to follow above-mentioned process, that is to say that eNB need to issue CRS and PDCCH to grand UE.And in the system at type 2 relaying places, if type 2 relayings send CRS to type 2R-UE, then can produce the CRS that eNB issues to grand UE and disturb, affect grand UE to the reception of CRS, thereby can affect the demodulation of PDCCH and PDSCH.
Based on above-mentioned analysis, the main purpose of considering type 2 relayings is the throughput of increase system, is the interference of control type 2 relayings to grand UE, in the data transmission method among the present invention, utilize eNB to issue CRS to type 2R-UE, type 2 relayings do not issue CRS to type 2R-UE.Simultaneously, type 2 relayings do not issue CRS to type 2R-UE, and the PDSCH data send to type 2R-UE by type 2 relayings, then also need to consider the demodulation problem of PDSCH data.Among the present invention, in order to allow type 2R-UE utilize the signal of relaying, type 2R-UE is configured to special-purpose transmission mode 7, uses DRS to carry out the demodulation of PDSCH data.Wherein, transmission mode 7 has defined the beam forming processing mode, and DRS is the pilot tone after processing through the beam shaping of this definition, and therefore, type 2R-UE can directly utilize this DRS that PDSCH is carried out demodulation.Concrete beam shaping is processed and can independently be disposed at eNB and relaying place, as long as the running time-frequency resource that uses and debugging coded system (MCS) are identical.
In sum, the data transmission method for uplink at network side comprises among the present invention: the corresponding schedule information of PDSCH data is sent to type 2R-UE by PDCCH; The beam shaping that the PDSCH data are preset is processed, and PDSCH data after will processing and process corresponding DRS with described beam shaping, sends to described UE; ENB directly sends to described UE with public reference signal CRS, and described type 2 relayings do not send CRS to described UE.Above-mentioned sending method is that the data transmission method for uplink by the data transmission method for uplink of eNB and type 2 relayings combines and forms, and acting in conjunction is used for to type 2R-UE the transmission of data.
With above-mentioned sending method correspondingly, when the UE side is carried out data receiver, UE need to be set be operated in transmission mode 7; When carrying out data receiver, UE receives CRS from eNB, the schedule information that demodulation is carried by PDCCH, and according to the PDSCH data of demodulation result reception after default beam shaping is processed, the beam shaping with default that recycling receives is processed corresponding DRS, and the PDSCH data that receive are carried out demodulation.
In above-mentioned data send, the schedule information of PDCCH carrying can be that eNB passes through type 2 relay forwardings to type 2R-UE, namely at eNB and type 2 relay wells, between type 2 relayings and type 2R-UE, all have PDCCH, perhaps, also can be that eNB directly sends to type 2R-UE, namely between eNB and type 2R-UE, there is PDCCH, and between type 2 relayings and type 2R-UE, do not have PDCCH.
Owing to need to utilize CRS to carry out the demodulation of PDCCH, therefore, CRS and PDCCH are preferably corresponding, if the CRS information of the PDCCH channel that UE receives and reception is not mated, may cause the demodulation performance of PDCCH signal to descend.Therefore, preferably, the schedule information of PDCCH carrying directly sends to type 2R-UE by eNB.
If type 2 relayings do not send CRS and Physical Downlink Control Channel (PDCCH), this relaying can not send broadcast channel (PBCH) yet so, or even synchronously main and auxiliary synchronous signal (PSS/SSS).Simultaneously, eNB is identical with existing implementation to the mode that type 2R-UE sends CRS, hereinafter just repeats no more.
When not having PDCCH between UE and type 2 relayings, the data transmission method for uplink that carries out in the eNB side among the present invention comprises: eNB sends at least one type 2 relaying of serving UE with the PDSCH data to a UE to be sent and corresponding schedule information thereof; And the PDCCH of CRS and carrying PDSCH data corresponding schedule information directly sent to UE.
The data transmission method for uplink that carries out at type 2 trunk sides comprises: type 2 relay reception eNB send PDSCH data and corresponding schedule information thereof, and according to described schedule information, the described PDSCH data of DRS and reception are sent to the UE of described type 2 relay services; Described type 2 relayings do not send public reference signal CRS to described UE.Wherein, type 2 relayings send to the data of PDSCH data for processing through default beam shaping of UE, and this beam shaping is processed operation and can be carried out at eNB, perhaps can carry out at type 2 relaying places; The DRS that sends is with this beam shaping and processes corresponding pilot frequency information.
Next, the specific embodiment of the present invention is described in detail.For convenience of description, the data of the eNB that provides among the present invention are sent and the data transmission method for uplink of type 2 relayings and accordingly method of reseptance introduce in the lump.Wherein, preferably between type 2 relayings and type 2R-UE, not exist PDCCH to describe as example.And, in the following examples, the PDSCH data that issue are carried out beam shaping process in eNB, to carry out as example, in fact, also this beam shaping can be processed and in type 2 relayings, carry out.
Embodiment one:
In the present embodiment, do not consider situation about retransmitting, the each implementation to UE transmission PDSCH data is described.
In the present embodiment, when needs issued the PDSCH data to certain type 2R-UE, eNB utilized at least one type 2 relaying serve the type 2R-UE, with the PDSCH data retransmission after beam shaping is processed to the type 2R-UE; ENB will directly send to the type 2R-UE by PDCCH with the corresponding schedule information of PDSCH data; Carry out all types 2 relayings of described PDSCH data retransmission, will process corresponding DRS with beam shaping and send to the type 2R-UE;
The type 2R-UE directly from eNB receive by the PDCCH carrying with the corresponding schedule information of described PDSCH data, and from type 2 relay reception PDSCH data and DRS, all PDSCH data that receive are merged, all DRS that receive are merged the PDSCH data after the DRS demodulation after recycling merges merges.
In above-mentioned data transfer mode, need to finish issuing of one group of PDSCH data by two descending time slots, and, when carrying out the PDSCH data retransmission, can utilize one or more type 2 relayings to transmit.Below, provide two of above-mentioned transmission means concrete transmission examples, transmit utilizing one and a plurality of type 2 relayings, be illustrated.Wherein, describe to utilize two descending time slots to finish issuing as example of one group of PDSCH data.
Example one: utilize a type 2 relaying RN A for the type 2R-UE (hereinafter referred to as UE B) of service carries out relay forwarding, specifically comprise:
Step 101, at descending time slot 1, eNB sends PDSCH data, PDSCH data in the schedule information of descending time slot 1 and descending time slot 2 to RN A.
Wherein, sending to the data of the PDSCH of RN A, is the PDSCH data that send to UE B in a descending time slot of system call; This UE B is the UE of RN A service;
ENB to the mode that RN A sends descending time slot 1 schedule information is: the schedule information in the C-RNTI transmission descending time slot 1 of PDCCH use RNA, and wherein, C-RNTI is the sign of node (comprising relaying and UE) in system in the system, the whole network is unique;
ENB to RN A send descending time slot 2 schedule informations mode can for: use the C-RNTI of relaying to send at PDCCH, perhaps, also can utilize and RN A between the schedule information of PDSCH transmission descending time slot 2.
Step 102, at descending time slot 2, eNB sends the PDSCH data in the schedule information of descending time slot 2 to UE B, and RN A sends PDSCH data and DRS to UE B; UE utilizes the schedule information that receives to determine the bearing mode of PDSCH data, and utilizes the PDSCH data demodulates of DRS to receiving.
Wherein, eNB to the mode that UE B sends the schedule information of descending time slot 2 is: utilize the C-RNTI of UE B to send the schedule information of descending time slot 2 at PDCCH.
Example two: eNB determines to utilize a plurality of relayings of serving type 2R-UE (hereinafter referred to as UE B) to carry out transfer of data, and these a plurality of relayings consist of relay collection C, and concrete transfer of data flow process comprises:
Step 201, at descending time slot 1, eNB each relaying in the relay collection C sends PDSCH data, PDSCH data in the schedule information of descending time slot 1 and descending time slot 2.
Wherein, sending to the data of the PDSCH of RN A, is the PDSCH data that send to UE B in a descending time slot of system call; This UE B is the UE of RN A service;
ENB to the mode that each relaying among the relay collection C sends descending time slot 1 schedule information is: the schedule information in the C-RNTI transmission descending time slot 1 of described each relaying of PDCCH use;
ENB each relaying in the relay collection C send descending time slot 2 schedule informations mode can for: use the C-RNTI of described each relaying to send at PDCCH, perhaps, also can utilize the schedule information with the PDSCH transmission descending time slot 2 of each relay well.
Step 202, at descending time slot 2, eNB sends the PDSCH data in the schedule information of descending time slot 2 to UE B, and each relaying among the relay collection C sends PDSCH data and DRS to UE B; The schedule information that UE utilize to receive is determined the bearing mode of PDSCH data, the PDSCH data of all receptions is merged, and the DRS of all receptions is merged the PDSCH data demodulates after the DRS after recycling merges is combined.
Wherein, eNB is identical with example one to the mode of the schedule information of UE B transmission descending time slot 2.
In example two, utilize a plurality of relayings to carry out the PDSCH data transfer, thereby can realize certain merging gain, improve the receptivity of PDSCH data.
In above-mentioned two examples, only describe as an example of two descending time slots example.In fact, applicable too to a plurality of descending time slots.Type 2R-UE is only from type 2 relay reception PDSCH data and DRS, and only receives PDCCH and CRS from eNB.
Particularly, under the descending time slot that (comprises three) more than three, the Embedded process of descending time slot one by one, namely at descending time slot 2, eNB not only issues descending time slot 2 schedule informations to UE, also issue PDSCH data and the schedule information that need to send to UE at descending time slot 3 to each relaying, begin next group PDSCH data transfer; At descending time slot 3, eNB sends to UE with the schedule information of next group PDSCH data, and relaying also can directly be handed down to UE with next group PDSCH data and DRS; UE both from eNB receiving scheduling information, from relay reception PDSCH data and DRS, carried out data demodulates again still at each descending time slot.In this way, each descending time slot is nested one by one, realizes many group PDSCH data transfers.
Perhaps, under the descending time slot that (comprises three) more than three, all right bulk transfer schedule information, namely at descending time slot 2, eNB not only issues descending time slot 2 schedule informations to UE, also issue the schedule information that need to send to the PDSCH data of UE at descending time slot 3,4... to each relaying, prepare several groups of PDSCH data transfers in back.
In more detail, at current descending time slot, eNB sends to type 2 relayings with the PDSCH data that next descending time slot need to send to UE, these PDSCH data are sent to described type 2 relayings in the schedule information of this descending time slot by PDCCH, and the schedule information that rear N descending time slot (because eNB can only send to relaying the schedule information of this frame) in this frame need to be sent to PDSCH data rear N descending time slot in this frame of type 2 relayings sends to type 2 relayings;
Any one descending time slot n in rear N the descending time slot in this frame, eNB sends to described type 2 relayings with the PDSCH data that described descending time slot n+1 need to send to described UE, and descending time slot n need to be sent to the PDSCH data of UE in the schedule information of descending time slot n, directly send to described UE by PDCCH, the PDSCH data retransmission that type 2 relayings receive descending time slot n-1 is to UE, and DRS is also sent to UE.UE both from eNB receiving scheduling information, from relay reception PDSCH data and DRS, carried out data demodulates again still at each descending time slot.
By the mode of above-mentioned bulk transfer schedule information, can realize the continuous transmission of PDSCH data.
Among these following two embodiment, consider the situation of re-transmission, the implementation of subtend UE transmission PDSCH data is described.
Embodiment two:
In the present embodiment, when needs issue the PDSCH data to certain type 2R-UE, type 2 relayings that the PDSCH data that eNB will transmit first directly send to the type 2R-UE and serve this UE; When needs retransmitted these PDSCH data, the PDSCH data that type 2 relayings will need to retransmit sent to the type 2R-UE.
The type 2R-UE directly receives the first PDSCH data of transmission from eNB, and carries out demodulation, and after the demodulation failure, to type 2 relayings feedback demodulation failure information, the PDSCH data that retransmit from type 2 relay receptions are again carried out demodulation.
In above-mentioned data transfer mode, need to finish issuing first and retransmitting of one group of PDSCH data by two descending time slots.Below, provide one of above-mentioned transmission means concrete transmission example wherein, describe as example to utilize two descending time slots to finish issuing first of one group of PDSCH data and re-transmission.
Example three: utilize a type 2 relaying RN A for the type 2R-UE (hereinafter referred to as UE B) of service carries out relay forwarding, specifically comprise:
Step 301, at descending time slot 1, eNB sends the data, PDSCH data of PDSCH in the schedule information of descending time slot 1 and descending time slot 2 to RN A, and sends the data, PDSCH data of PDSCH at schedule information and the DRS of descending time slot 1 to UE B.
Wherein, the PDSCH data that eNB sends to RN A and UE B are identical, all are PDSCH data that send to UE B in a descending time slot of system call;
ENB to the mode that UE B sends descending time slot 1 schedule information is: the schedule information in the C-RNTI transmission descending time slot 1 of PDCCH use UEB;
When eNB sends descending time slot 1 schedule information to RN A, can use the C-RNTI of RN A to send at PDCCH; Perhaps, can use the C-RNTI of UE B to send the schedule information of this descending time slot 1 at PDCCH, owing to preserve the C-RNTI of UE B among the RN A, so RN A can parse this schedule information, like this, can finish in the lump to the purpose of RN A and UE B transmission descending time slot 1 schedule information;
ENB is identical with example one to the mode that RN A sends descending time slot 2 schedule informations, just repeats no more here.
Step 302, UE determines from the bearing mode of the PDSCH data of eNB reception, and utilizes the DRS that receives from eNB that the PDSCH data that receive are carried out demodulation from the schedule information that eNB receives the descending time slot 1 of PDCCH carrying, if the demodulation failure is then to RN A feedback demodulation failure information.
Step 303, at descending time slot 2, eNB sends the PDSCH data in the schedule information of descending time slot 2 to UE B, and RN A sends PDSCH data and DRS again to UE B; UE utilizes the schedule information that receives to determine the bearing mode of PDSCH data, and utilizes the PDSCH data demodulates of DRS to retransmitting.
Wherein, eNB is identical with example one to the mode that UE B sends schedule information, just repeats no more here.
So far, first transmission and the re-transmission of PDSCH data have namely been realized.In the present embodiment, the PDSCH data directly send to UE by eNB when transmitting first, when retransmitting, send to UE by type 2 relayings.
Embodiment three:
In the present embodiment, when needs issue the PDSCH data to certain type 2R-UE, type 2 relayings that the PDSCH data that eNB will send first directly send to the type 2R-UE and serve this UE; When needs retransmitted described PDSCH data, the PDSCH data that eNB and type 2 relayings will need to retransmit sent to the type 2R-UE.
UE directly receives the PDSCH data that send first from eNB, and carries out demodulation, after the demodulation failure, receives PDSCH data and the DRS that retransmits from type 2 relayings and eNB; To carry out demodulation after the PDSCH data merging that retransmit.
In above-mentioned data transfer mode, need to finish issuing first and retransmitting of one group of PDSCH data by two descending time slots.Below, provide one of above-mentioned transmission means concrete transmission example wherein, describe as example to utilize two descending time slots to finish issuing first of one group of PDSCH data and re-transmission.
Example four: utilize a type 2 relaying RN A for the type 2R-UE (hereinafter referred to as UE B) of service carries out relay forwarding, specifically comprise:
Step 401, at descending time slot 1, eNB sends the data, PDSCH data of PDSCH in the schedule information of descending time slot 1 and descending time slot 2 to RN A, and sends the data, PDSCH data of PDSCH at schedule information and the DRS of descending time slot 1 to UE B.
Wherein, concrete send mode is identical with example one, just repeats no more here.
Step 402, UE determines from the bearing mode of the PDSCH data of eNB reception, and utilizes the DRS that receives from eNB that the PDSCH data that receive are carried out demodulation from the schedule information that eNB receives the descending time slot 1 of PDCCH carrying, if the demodulation failure is then to RN A feedback demodulation failure information.
Step 403, at descending time slot 2, eNB sends the PDSCH data in the schedule information of descending time slot 2 to UE B, and eNB and RN A send PDSCH data and DRS again to UE B; UE utilizes the schedule information that receives to determine the bearing mode of PDSCH data, and the PDSCH data and the PDSCH data merging that is received from RN A of eNB will be received from the descending time slot 2, the DRS that is received from eNB in the descending time slot 2 is merged the PDSCH data demodulates after the DRS after utilization merges is combined with the DRS that is received from RN A.
So far, first transmission and the re-transmission of PDSCH data have namely been realized.In the present embodiment, the PDSCH data directly send to UE by eNB when transmitting first, when retransmitting, send to UE by eNB and type 2 relayings, demodulation after UE merges the data retransmission that receives.By the mode in the present embodiment, all send the PDSCH data by eNB and type 2 relayings, can obtain to merge gain when retransmitting so that UE is in, thereby improve the receptivity of PDSCH data.
Above-mentioned example two and example three be the data transfer mode under the explanation consideration re-transmission as an example of two descending time slots example all, in fact, applicable too for more descending time slots, specifically can adopt one by one the modes such as the nested and bulk transfer schedule information of descending time slot, identical among the nested mode with the bulk transfer schedule information of concrete one by one descending time slot and the embodiment one, just repeat no more here.
The above-mentioned embodiment of introducing the data transmission method that the present invention proposes behind type 2 relayings that is.In said method, eNB is identical with existing mode to the process that UE sends CRS, so when describing specific implementation, and not mentioned, in fact, in whole data transmission method, eNB sends CRS according to existing mode to UE all the time.
With said method correspondingly, the present invention also provides eNB and the type 2 relaying concrete structures that are used for realizing correlation method.And type 2R-UE can adopt existing structure, and setting works in transmission mode 7 times.
Particularly, comprise type 2 relay interface unit and UE interface unit with embodiment one corresponding eNB;
Wherein, type 2 relay interface unit are used for the PDSCH data to system's type 2 relayings institute service UE to be sent are sent to described type 2 relayings, and send and the corresponding schedule information of PDSCH data to type 2 relayings by PDCCH;
The UE interface unit is used for sending and the corresponding schedule information of described PDSCH data to described UE by PDCCH, and sends the public reference signal CRS that is used for demodulation PDCCH to UE.
Comprise eNB interface unit and UE interface unit with embodiment one corresponding type 2 relayings;
Wherein, the eNB interface unit, be used for to receive the PDSCH data that the eNB that links to each other with self issues and carry by PDCCH with the corresponding schedule information of these PDSCH data.
The UE interface unit is used for the PDSCH data of DRS and reception are sent to the UE that self serves, and does not send public reference signal CRS to described UE.Wherein, the PDSCH data that send to UE are processed through default beam shaping, and dedicated pilot is to process corresponding pilot frequency information with this beam shaping.
When above-mentioned eNB be applied to shown in the example two utilize a plurality of type 2 relayings for the method for UE forwarding data in the time, type 2 relay interface unit wherein are further used for a plurality of types 2 relayings to service UE, issue PDSCH data and corresponding schedule information.
Also comprise type 2 relay interface unit and UE interface unit with embodiment two corresponding eNB;
Wherein, type 2 relay interface unit are used for the PDSCH data to system's type 2 relayings institute service UE to be sent are sent to type 2 relayings, and send and the corresponding schedule information of described PDSCH data to described type 2 relayings by PDCCH;
The UE interface unit, when sending described PDSCH data first, described PDSCH data and DRS are sent to UE, when transmitting first and retransmitting the PDSCH data, send and the corresponding schedule information of PDSCH data to UE by PDCCH, and send the public reference signal CRS that is used for demodulation PDCCH to UE.Wherein, the PDSCH data that send to UE are processed through default beam shaping, and dedicated pilot is to process corresponding pilot frequency information with this beam shaping.
Comprise eNB interface unit and UE interface unit with embodiment two corresponding type 2 relayings;
Wherein, the eNB interface unit, be used for to receive the PDSCH data that the eNB that links to each other with self issues and carry by PDCCH with the corresponding schedule information of these PDSCH data; Described PDSCH data are processed through default beam shaping.
The UE interface unit is used for the PDSCH data that will receive and processes corresponding dedicated pilot DRS with described beam shaping sending to the UE that self serves, and does not send public reference signal CRS to described UE; Be further used for receiving the information of the described PDSCH data demodulates failure of UE feedback, and after this information of reception, be used for the PDSCH data, again send to UE with the corresponding schedule information of PDSCH data and DRS.Wherein, the PDSCH data that send to UE are processed through default beam shaping, and dedicated pilot is to process corresponding pilot frequency information with this beam shaping.
Also comprise type 2 relay interface unit and UE interface unit with embodiment three corresponding eNB;
Wherein, type 2 relay interface unit are used for the PDSCH data to system's type 2 relayings institute service UE to be sent are sent to type 2 relayings, and send and the corresponding schedule information of described PDSCH data to described type 2 relayings by PDCCH;
The UE interface unit when sending described PDSCH data first, sends to UE with described PDSCH data and DRS, sends and the corresponding schedule information of PDSCH data to UE by PDCCH; Be used for to receive the information of the PDSCH data demodulates failure of UE feedback, and after this information of reception, with described PDSCH data, again send to described UE with the corresponding schedule information of described PDSCH data and described DRS; Also be used for sending the public reference signal CRS that is used for demodulation PDCCH to UE.Wherein, the PDSCH data that send to UE are processed through default beam shaping, and dedicated pilot is to process corresponding pilot frequency information with this beam shaping.
With embodiment three corresponding type 2 relayings and identical with embodiment three corresponding type 2 relay structures, just repeat no more here.
Above-mentioned concrete structure and the corresponding function of introducing eNB provided by the invention and type 2 relayings behind type 2 relayings that be.Wherein, only the structure that the present invention relates to is described, finishes the unit of other inherent function in eNB and type 2 relayings for needs, introduce.Its specific implementation is with existing identical.UE can adopt existing implementation structure, just repeats no more here.
By the specific implementation of the invention described above as seen, in the LTE-A system that introduces type 2 relayings, the invention provides the concrete mode of between eNB, type 2 relayings and type 2R-UE, carrying out transfer of data, can realize transfer of data.And, in this transmission means, issuing CRS by eNB to UE, type 2 relayings do not issue CRS to UE, thereby have avoided the Pilot Interference for grand UE; Simultaneously, preferably, UE only receives PDCCH from eNB, and there are not PDCCH in UE and type 2 relay wells, thereby have reduced the expense of PDCCH.
Being preferred embodiment of the present invention only below, is not for limiting protection scope of the present invention.Within the spirit and principles in the present invention all, any modification of doing, be equal to replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (14)
1. the data transmission method for uplink in the relay system is characterized in that the method comprises:
ENB sends at least one relaying of serving described UE with the PDSCH data of a UE and the corresponding schedule information thereof of giving to be sent;
ENB directly sends to described UE with the PDCCH of public reference signal CRS and the corresponding schedule information of the described PDSCH data of carrying;
Wherein,
ENB to the mode that described relaying sends described PDSCH data and corresponding schedule information thereof is: at current descending time slot, the PDSCH data that next descending time slot need to be sent to described UE send to described relaying, described PDSCH data are sent to described relaying in the schedule information of this descending time slot by PDCCH, described PDSCH data are sent to described relaying in the schedule information of next descending time slot by PDCCH or PDSCH;
ENB to the mode that described UE sends the corresponding schedule information of described PDSCH data is: at described next descending time slot, described eNB directly sends to described UE in the schedule information of described next descending time slot by PDCCH with described PDSCH data.
2. sending method according to claim 1 is characterized in that, the method further comprises: PDSCH data that eNB will transmit first and process corresponding dedicated pilot with beam shaping directly send to described UE.
3. sending method according to claim 2, it is characterized in that, the descending time slot that sends first in described PDSCH data, described eNB is with described PDSCH data and in the schedule information of this descending time slot, directly send to described UE and described relaying, and described dedicated pilot directly sent to described UE, the schedule information of described PDSCH data on the descending time slot that retransmits described PDSCH data sent to described relaying by PDCCH or PDSCH.
4. sending method according to claim 2, it is characterized in that, the method further comprises: described eNB receives the information of the PDSCH data demodulates failure of described UE feedback, and after this information of reception, PDSCH data and dedicated pilot that needs are retransmitted send to described UE.
5. sending method according to claim 4, it is characterized in that, the descending time slot that sends first in described PDSCH data, described eNB is with described PDSCH data and in the schedule information of this descending time slot, directly send to described UE and described relaying, and described dedicated pilot directly sent to described UE, the schedule information of described PDSCH data on the descending time slot that retransmits described PDSCH data sent to described relaying by PDCCH or PDSCH;
On the descending time slot that retransmits described PDSCH data, the described PDSCH data that described eNB will transmit first directly send to described UE in the schedule information of this descending time slot by PDCCH; Described PDSCH data and described dedicated pilot that described eNB will retransmit send to described UE.
6. the data transmission method for uplink in the relay system is characterized in that the method comprises:
ENB sends at least one relaying of serving described UE with the PDSCH data of a UE and the corresponding schedule information thereof of giving to be sent;
ENB directly sends to described UE with the PDCCH of public reference signal CRS and the corresponding schedule information of the described PDSCH data of carrying;
Wherein, eNB to the mode that described relaying sends described PDSCH data and corresponding schedule information thereof is: at current descending time slot, described eNB sends to described relaying with the PDSCH data that next descending time slot need to send to described UE, described PDSCH data are sent to described relaying in the schedule information of this descending time slot by PDCCH, and the schedule information that rear N descending time slot in this frame need to be sent to PDSCH data rear N descending time slot in this frame of relaying sends to described relaying by PDCCH or PDSCH; Any one descending time slot n in rear N the descending time slot in this frame, eNB sends to described relaying with the PDSCH data that described descending time slot n+1 need to send to described UE;
ENB to the mode that described UE sends the corresponding schedule information of described PDSCH data is: any one the descending time slot n in rear N the descending time slot in this frame, described eNB need to send to the PDSCH data of UE in the schedule information of descending time slot n with descending time slot n, directly sends to described UE by PDCCH.
7. sending method according to claim 6 is characterized in that, the method further comprises: PDSCH data that eNB will transmit first and process corresponding dedicated pilot with beam shaping directly send to described UE.
8. sending method according to claim 7, it is characterized in that, the descending time slot that sends first in described PDSCH data, described eNB is with described PDSCH data and in the schedule information of this descending time slot, directly send to described UE and described relaying, and described dedicated pilot directly sent to described UE, the schedule information of described PDSCH data on the descending time slot that retransmits described PDSCH data sent to described relaying by PDCCH or PDSCH.
9. sending method according to claim 7, it is characterized in that, the method further comprises: described eNB receives the information of the PDSCH data demodulates failure of described UE feedback, and after this information of reception, PDSCH data and dedicated pilot that needs are retransmitted send to described UE.
10. sending method according to claim 9, it is characterized in that, the descending time slot that sends first in described PDSCH data, described eNB is with described PDSCH data and in the schedule information of this descending time slot, directly send to described UE and described relaying, and described dedicated pilot directly sent to described UE, the schedule information of described PDSCH data on the descending time slot that retransmits described PDSCH data sent to described relaying by PDCCH or PDSCH;
On the descending time slot that retransmits described PDSCH data, the described PDSCH data that described eNB will transmit first directly send to described UE in the schedule information of this descending time slot by PDCCH; Described PDSCH data and described dedicated pilot that described eNB will retransmit send to described UE.
11. the data transmission method for uplink in the relay system is characterized in that the method comprises:
The PDSCH data that relay reception eNB sends and corresponding schedule information thereof, and according to described schedule information, the described PDSCH data of dedicated pilot and reception are sent to the UE of described relay services; Wherein, the PDSCH data that send to described UE are processed through default beam shaping, and described dedicated pilot is to process corresponding pilot frequency information with described beam shaping;
Described relaying does not send public reference signal CRS to described UE;
Wherein, relaying from the mode that described eNB receives PDSCH data and corresponding schedule information thereof is: in current time slots, and described PDSCH data of described relay reception and in the schedule information of this descending time slot;
Relaying comprises to the mode that described UE issues PDSCH data and dedicated pilot: at next descending time slot of described current time slots, described relaying is given described UE with the PDSCH data retransmission of described current descending time slot reception, and described dedicated pilot is sent to described UE.
12. sending method according to claim 11 is characterized in that, described relay reception is carried out the operation that sends PDSCH data and DRS to described UE behind the demodulation failure information of described UE feedback.
13. the data transmission method for uplink in the relay system is characterized in that the method comprises:
The PDSCH data that relay reception eNB sends and corresponding schedule information thereof, and according to described schedule information, the described PDSCH data of dedicated pilot and reception are sent to the UE of described relay services; Wherein, the PDSCH data that send to described UE are processed through default beam shaping, and described dedicated pilot is to process corresponding pilot frequency information with described beam shaping;
Described relaying does not send public reference signal CRS to described UE;
Wherein, relaying from the mode that described eNB receives PDSCH data and corresponding schedule information thereof is: at current descending time slot, receive the PDSCH data that next descending time slot need to send to described UE, reception utilizes the described PDSCH data of PDCCH carrying in the schedule information of this descending time slot; And the PDSCH data that send to self after receiving in this frame in N descending time slot rear schedule information of N descending time slot in this frame; Any one descending time slot n in rear N the descending time slot in this frame receives the PDSCH data that described descending time slot n+1 need to send to described UE;
Relaying comprises to the mode that described UE issues PDSCH data and dedicated pilot: any one the descending time slot n in rear N the descending time slot in this frame, described relaying is given described UE with the PDSCH data retransmission of descending time slot n-1 reception, and described dedicated pilot is sent to described UE.
14. sending method according to claim 13 is characterized in that, described relay reception is carried out the operation that sends PDSCH data and DRS to described UE behind the demodulation failure information of described UE feedback.
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| CN 200910083065 CN101873609B (en) | 2009-04-27 | 2009-04-27 | Data transmission method and device for relay system |
| PCT/CN2010/072198 WO2010124605A1 (en) | 2009-04-27 | 2010-04-26 | Method and apparatus for data transmission in relay system |
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| CN 200910083065 CN101873609B (en) | 2009-04-27 | 2009-04-27 | Data transmission method and device for relay system |
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| US8472366B2 (en) | 2008-09-22 | 2013-06-25 | Research In Motion Limited | Network-relay signaling for downlink transparent relay |
| RU2543977C2 (en) * | 2009-09-21 | 2015-03-10 | Блэкберри Лимитед | Relay method and base station |
| CN103238285B (en) * | 2010-12-03 | 2017-06-09 | 三星电子株式会社 | For the reference signaling distribution in distributing antenna system and the method and apparatus of channel estimation |
| WO2012112614A1 (en) * | 2011-02-14 | 2012-08-23 | Huawei Technologies Co., Ltd | Control channel transmission and reception method and system |
| CN104012061B (en) * | 2011-11-01 | 2017-08-15 | Lg电子株式会社 | Method and wireless device for monitoring control channel |
| CA2860981C (en) * | 2012-01-13 | 2019-02-19 | Branislav Popovic | Method for generating and transmitting demodulation reference signals |
| US10791542B2 (en) * | 2012-01-27 | 2020-09-29 | Qualcomm Incorporated | Regional and narrow band common reference signal (CRS) for user equipment (UE) relays |
| CN103379072B (en) * | 2012-04-20 | 2016-12-14 | 电信科学技术研究院 | A kind of method for transmitting signals and device |
| CN106954260B (en) * | 2016-01-07 | 2023-05-30 | 中兴通讯股份有限公司 | Resource allocation method and device |
| CN107547178B (en) * | 2016-06-29 | 2021-02-12 | 中兴通讯股份有限公司 | Data transmission method, device, base station, terminal equipment and system |
| CN108737034B (en) * | 2017-04-13 | 2021-08-03 | 华为技术有限公司 | Method and device for transmitting information and method and device for receiving information |
| CN109391401B (en) * | 2017-08-10 | 2021-07-23 | 大唐移动通信设备有限公司 | Transmission method of downlink control information, base station, terminal and storage medium |
| CN109618352B (en) * | 2019-01-14 | 2019-11-15 | 普兴移动通讯设备有限公司 | A kind of non line of sight relay communications system based on LTE |
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