CN101925188B - A kind of downlink feedback information for trunk link transmission method and device - Google Patents
A kind of downlink feedback information for trunk link transmission method and device Download PDFInfo
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- CN101925188B CN101925188B CN200910149122.6A CN200910149122A CN101925188B CN 101925188 B CN101925188 B CN 101925188B CN 200910149122 A CN200910149122 A CN 200910149122A CN 101925188 B CN101925188 B CN 101925188B
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Abstract
The invention discloses a kind of transmission method of downlink feedback information for trunk link, comprise: when the mode that the relay sub-frame configuration in radio frames makes the downlink feedback information of repeated link cannot specify according to time division duplex Long Term Evolution agreement carries, the new bearing mode of described downlink feedback information is determined according to the relay sub-frame of described radio frames in base station, the relay sub-frame information of described radio frames and/or described new bearing mode are notified described relay station, and carries by described new bearing mode and transmit described downlink feedback information.The present invention discloses a kind of device realizing preceding method.The present invention realizes simple and practical.
Description
Technical field
The present invention relates to downlink feedback information for trunk link transmission technology, particularly relate to a kind of time division duplex (TDD, TimeDivisionDual) transmission method of downlink feedback information for trunk link and device in senior Long Term Evolution (LTE-A, LongTermEvolution-Advanced) system.
Background technology
The demand for development of mobile communication to support higher transmission rate, more perfect quorum sensing inhibitor and higher resource utilization.In order to reach high transfer rate, next generation mobile communication system will adopt higher frequency bandwidth transmission signals, and higher frequency bandwidth will bring larger path loss simultaneously, affect the network coverage.Relaying (Relay) technology can increase covering and balance, increase cell throughout, and relay station is compared to base station, there is relatively little deployment cost, therefore relaying technique is regarded as the evolution system of Long Term Evolution (LTE, LongTermEvolution)--a key technology in lte-a system.
In the LTE system of TDD, frequency resource divides in time in units of frame.A in Fig. 1 is the wireless frame structure schematic diagram in LTE system, and as shown in a in Fig. 1, the length of each radio frames is 10 milliseconds, comprises the subframe that 10 length are 1 millisecond, wherein comprises sub-frame of uplink, descending sub frame and special subframe respectively.Ratio for ascending-descending subframes is different, has 7 kinds of subframe configuration structures in TDDLTE system, as shown in table 1:
Table 1
System can carry out flexible configuration according to the traffic carrying capacity of up-downgoing in community; wherein D represents descending sub frame; U represents sub-frame of uplink; S represents special subframe; as shown in b in Fig. 1, S subframe comprises a part of downlink symbol (DownlinkPilotTimeSlot is called for short DwPTS), a part of uplink symbol (UplinkPilotTimeSlot; be called for short UpPTS) and up-downgoing between the protection interval (GuardPeriod, be called for short GP) of changing.As the evolution system of the TDDLTE of guarantee backwards compatibility, TDDLTE-A system can keep the frame structure identical with TDDLTE.
In TDDLTE system, between business datum and transmission of feedback information, meet certain timing relationship.For the downstream feedback of uplink traffic transmission, data are sent at n sub-frame of uplink subscriber equipment, at n+k descending sub frame, base station confirms (ACK according to the data received to subscriber equipment feedback is corresponding, or non-acknowledgement (NACK, NegativeAcknowledge) information Acknowledge).K is different from, specifically as shown in table 2 the difference of TDD system subframe uplink-downlink configuration and subframe position:
Table 2
Introduce relay station in TDDLTE-A system after, be equivalent to the many jumpings of the transmission of data, the communication pattern of namely original base station-terminal there occurs change.For double bounce system, the communication pattern accepting the terminal of relay station service becomes the mode of base station-relay station-terminal.At this moment just need in uplink and downlink resource, to divide the communication resource of a part as base station-relay station respectively, namely a part of subframe is marked for the transfer of data between base station-relay station, these subframes are called as relay sub-frame, and corresponding transmission link is called as repeated link.But, relay station cannot carry out the operation sending and receive in same frequency resource simultaneously, if at this moment continue the feedback timing relationship of the ACK/NACK information continued to use in TDDLTE, the ACK/NACK feedback information of some the repeated link business transmission caused in system is lost.
See table 1, in TDD system subframe uplink-downlink configuration mode 3, suppose that 7,8 work song frames are as downlink relay sub-frame, 3 work song frames are as uplink relay subframe.According to the regulation of TDDLTE agreement, No. 3 sub-frame of uplink service data transmissions, No. 9 descending sub frames feed back, namely the corresponding ACK/NACK feedback information of No. 3 sub-frame of uplink business datums is carried, but in TDDLTE-A system, No. 9 descending sub frames are used for relay station to user terminal (UE, UserEquipment) downlink data is sent, obviously, if continue the ACK/NACK continued to use in TDDLTE agreement to feed back timing relationship, the feedback information ACK/NACK of the uplink business data caused in No. 3 relay sub-frame is lost.
Summary of the invention
In view of this, main purpose of the present invention is the transmission method, the device that provide a kind of downlink feedback information for trunk link, reasonably for the feedback information ACK/NACK of uplink business data arranges carrying subframe, and can be transferred to relay station.
For achieving the above object, technical scheme of the present invention is achieved in that
A transmission method for downlink feedback information for trunk link, comprising:
When the mode that the configuration of the relay sub-frame in radio frames makes the downlink feedback information of repeated link cannot specify according to time division duplex Long Term Evolution agreement carries, system determines the new bearing mode of described downlink feedback information for trunk link according to the configuration of the relay sub-frame of described radio frames, and base station carries according to described new bearing mode and transmits described downlink feedback information.
Preferably, described method also comprises:
The relay sub-frame configuration information of described radio frames and/or described new bearing mode are notified described relay station by described base station.
Preferably, described new bearing mode comprises: arrange respectively to carry the timing relationship between described downlink feedback information and uplink traffic transmission according to the configuration mode of often kind of relay sub-frame in radio frames.
Preferably, described new bearing mode comprises: the indicating bit arranging the relay sub-frame position carrying described downlink feedback information, the relay sub-frame positional information of the described downlink feedback information of described indicating bit instruction carrying.
Preferably, described indicating bit directly indicates the relay sub-frame number carrying described downlink feedback information.
Preferably, the side-play amount of the relay sub-frame of the described downlink feedback information of described indicating bit instruction carrying, described side-play amount is subframe carry described downlink feedback information transmits subframe side-play amount relative to repeated link uplink business data;
Or described side-play amount is the subframe that the carries described downlink feedback information side-play amount relative to first downlink relay sub-frame after repeated link uplink business data transmission subframe.
Preferably, described indicating bit is carried in the control signal that described base station sends to described relay station.
Preferably, described new bearing mode comprises: the relay sub-frame carrying described downlink feedback information is first downlink relay sub-frame after uplink relay business transmission subframe after amount subframe.
Preferably, described method also comprises:
Described relay station obtains described downlink feedback information by monitoring each downlink relay sub-frame.
Preferably, the subframe carrying described downlink feedback information and uplink relay business datum comprises the special subframe with uplink and downlink timeslot and protection interval.
Preferably, described downlink feedback information confirms ACK information or non-acknowledgement nack message.
Preferably, described method also comprises:
When described base station determines that described downlink feedback information is nack message, send uplink authorization information dispatching of relays station directly to relay station and carry out the re-transmission of repeated link uplink service, and do not send described nack message.
A transmitting device for downlink feedback information for trunk link, comprising:
First determining unit, during for determining that the mode that the configuration of the relay sub-frame in radio frames makes the downlink feedback information of repeated link cannot specify according to time division duplex Long Term Evolution agreement carries, triggers the second determining unit;
Second determining unit, the new bearing mode of the downlink feedback information of described repeated link is determined in the configuration for the relay sub-frame according to described radio frames; And
Carrying and transmission unit, for carrying by described new bearing mode and transmitting described downlink feedback information.
Preferably, described device also comprises:
Notification unit, for notifying described relay station by the relay sub-frame information of described radio frames and/or described new bearing mode.
Preferably, described new bearing mode comprises: arrange respectively to carry the timing relationship between described downlink feedback information and repeated link uplink traffic transmission according to the configuration mode of often kind of relay sub-frame in radio frames.
Preferably, described new bearing mode comprises: the indicating bit arranging the relay sub-frame carrying described downlink feedback information, and described indicating bit dynamically indicates the relay sub-frame positional information carrying described downlink feedback information.
Preferably, described indicating bit directly indicates the relay sub-frame number carrying described downlink feedback information.
Preferably, the side-play amount of the relay sub-frame of the described downlink feedback information of described indicating bit instruction carrying, described side-play amount is subframe carry described downlink feedback information transmits subframe side-play amount relative to repeated link uplink business data;
Or described side-play amount is the subframe that the carries described downlink feedback information side-play amount relative to first downlink relay sub-frame after repeated link uplink business data transmission subframe.
Preferably, described indicating bit is arranged in the control signal that base station sends to relay station.
Preferably, described new bearing mode comprises: the relay sub-frame carrying described downlink feedback information is first downlink relay sub-frame after relay uplink business transmission subframe after amount subframe.
Preferably, the subframe carrying described downlink feedback information comprises the special subframe with uplink and downlink timeslot and protection interval.
Preferably, described downlink feedback information confirms ACK information or non-acknowledgement nack message.
Preferably, described device also comprises:
3rd determining unit, during for determining that described downlink feedback information is nack message, triggers transmitting element; And
Transmitting element, carries out information re-transmission for sending uplink authorization information dispatching of relays station directly to relay station, and does not send described nack message.
In lte-a system, when the mode that the relay sub-frame configuration in radio frames makes the downlink feedback information of repeated link cannot specify according to TDDLTE agreement carries, base station of the present invention is relay station determination up-downgoing relay sub-frame in radio frames, and determine new bearing mode for downlink feedback information, and by the bearing mode of the configuration mode of up-downgoing relay sub-frame and/or the new of downlink feedback information in radio frames notice relay station, base station is by the feedback information by this new bearing mode carrying uplink relay subframe, and send to relay station, new bearing mode real-time informing is to relay station, or, the bearing mode of feedback information arranged by prior and relay station, when the bearing mode of feedback information be can not determine by relay station, relay station will monitor all downlink relay sub-frame.Adopt method of the present invention, avoid the loss of downlink feedback information for trunk link, ensure that the reliability that repeated link uplink business data transmits, and support relay sub-frame configuration method flexibly.
Accompanying drawing explanation
Fig. 1 is radio frames in LTE system and special subframe structural representation;
Fig. 2 is the configuration mode structural representation of the relay sub-frame of embodiment one;
Fig. 3 is the configuration mode structural representation of the relay sub-frame of embodiment two;
Fig. 4 is the configuration mode structural representation of the relay sub-frame of embodiment three, four;
Fig. 5 is the configuration mode structural representation of the repeated link resource of embodiment five;
Fig. 6 is the composition structural representation of the transmitting device of downlink feedback information for trunk link of the present invention.
Embodiment
Basic thought of the present invention is: in lte-a system, when the mode that the relay sub-frame configuration in radio frames makes the downlink feedback information of repeated link cannot specify according to TDDLTE agreement carries, base station of the present invention in the up-downgoing relay sub-frame determined for downlink feedback information determines new bearing mode, and by the bearing mode of the configuration mode of up-downgoing relay sub-frame and/or the new of downlink feedback information in radio frames notice relay station, base station is by the feedback information by this new bearing mode carrying uplink relay subframe, and send to relay station, new bearing mode real-time informing is to relay station, or, the bearing mode of feedback information arranged by prior and relay station, when the bearing mode of feedback information be can not determine by relay station, relay station will monitor all downlink relay sub-frame.Concrete, described bearing mode is the timing relationship of described repeated link uplink traffic transmission and downlink feedback information.
For making the object, technical solutions and advantages of the present invention clearly understand, by the following examples also with reference to accompanying drawing, the present invention is described in more detail.
Suppose in TDDLTE-A system, a community comprises a base station and several relay stations.In view of the cause of failures that same carrier frequency is received and dispatched simultaneously, cause relay station not send in same resource simultaneously and to receive, therefore can mark a part of resource respectively and be used as communicating between relay station with base station in uplink and downlink subframe.If at this time continue to use the timing relationship of the descending ACK/NACK feedback specified in TDDLTE agreement, the loss of some descending ACK/NACK feedback information of repeated link may be caused.Therefore need the timing relationship redefining relay link downlink ACK/NACK transmission of feedback information, ensure the reliability of repeated link uplink traffic transmission.The essence of technical solution of the present invention is described in detail below by way of concrete example.
Embodiment one
A part of uplink and downlink subframe in radio frames is configured to be used as to communicate between base station and relay station, and this configuration is static.So-called static, the configuration mode of radio frames selected when referring to base station and relay station communication be determine and the configuration mode of the radio frames relay sub-frame of this configuration mode is also determined, in the radio frames namely selected and this radio frames, the method for salary distribution of relay sub-frame is determined.When namely communicating between base station and relay station, the uplink relay subframe and downlink relay sub-frame that have configured in certain radio frames must be used.Be described in subframe uplink-downlink configuration mode 6 in such as table 1 in this example.Fig. 2 is the configuration mode structural representation of the relay sub-frame of embodiment one, as shown in Figure 2, in the radio frames including relay sub-frame, subframe 4 is configured to be used as uplink relay subframe, subframe 9 is configured to be used as downlink relay sub-frame, and wherein, DL-B represents downlink relay sub-frame, namely in DL-B subframe, relay station receives the business datum from base station; UL-B represents uplink relay subframe, and namely in UL-B subframe, relay station sends data to base station.
According to the regulation of existing TDD LTE protocol, in subframe uplink-downlink configuration mode 6, in sub-frame of uplink 4, the corresponding ACK/NACK feedback information of business data transmission sends in the subframe 0 of next radio frames.In this example, because subframe 0 is not downlink relay sub-frame, also namely in subframe 0, relay station sends data message to the UE of its subordinate, cannot receive the feedback information of base station.If therefore according to the regulation of existing TDD LTE protocol, relay station, after 4 work song frames send business datum to base station, cannot receive corresponding feedback information ACK/NACK.
In the present invention, will the bearing mode of the ACK/NACK of uplink relay subframe business datum be reset, for the subframe uplink-downlink configuration mode 6 in table 1, be arranged on the feedback information ACK/NACK carrying relay uplink business datum in subframe 4 in subframe 9.Namely, in subframe 9, base station is to the corresponding ACK/NACK information of repeated link uplink business data in relay station feedback subframe 4.
Configuration due to the relay sub-frame in radio frames is static, namely when needs configuration relay sub-frame, for subframe uplink-downlink configuration mode 6, all descending sub frame 9 can be configured to downlink relay sub-frame, sub-frame of uplink 4 is configured to uplink relay subframe.Corresponding, the bearing mode of the ACK/NACK feedback information of relay uplink business datum is also determined, namely appoints if having uplink relay business in subframe 4, and so corresponding feedback information will transmission in stepchild's frame 9 in downstream.About fix this, base station is without the need to the carrier frame position of extra signaling to relay station indication feedback information, above-mentioned bearing mode is configured in relay station as configuration information, for the configuration mode of any one relay sub-frame, the timing relationship of the ACK/NACK feedback information of carrying relay uplink business datum is all determined, as in this example, fixing downlink relay sub-frame is set to carry the feedback information of repeated link upstream data.
Base station is resolved receive the business datum of relay station transmission in sub-frame of uplink 4 after, according to the check results of resolution data, generate corresponding ACK or nack message, and utilize the repeated link feedback information bearing mode of arranging between base station and relay station, determine that the subframe carrying feedback information is downlink relay sub-frame 9, then in subframe 9, send described ACK/NACK information.
When base station is NACK according to the feedback information that the check results of data produces, base station also can send feedback information NACK to relay station, and retransmit by sending uplink authorization (ULgrant) message scheduling relay station to relay station, replace relay link downlink NACK feedback information with this.
For disclosed technical scheme, in other subframe uplink-downlink configuration modes, fixing relay sub-frame can be determined equally, and set the downlink relay sub-frame of repeated link bearing downlink ACK/NACK information, repeat no longer one by one here.In this example, the position of downlink relay sub-frame in radio frames of loading ACK/nack message is fixing, is equivalent to set the timing relationship between the downlink relay sub-frame of loading ACK/nack message and uplink traffic transmission subframe.
Embodiment two
In radio frames, a part of uplink and downlink subframe is configured to be used as to communicate between base station and relay station, and this configuration is semi-static.So-called semi-static, refer to for certain subframe uplink-downlink configuration form, being configured in a period of time of relay sub-frame is well-determined, if namely need to communicate between base station and relay station, so base station according to the information configuration part sub-frame of uplink such as the possible traffic carrying capacity of relay station and descending sub frame as relay sub-frame, and this distributing sustainable a period of time is the configuration cycle of relay sub-frame during this period of time.After a configuration cycle, for same subframe uplink-downlink configuration mode, the configuring condition of relay sub-frame may change.This example is described in the subframe uplink-downlink configuration mode 3 shown in table 1.
Base station is according to information configuration relay sub-frame such as the possible business datum amounts of relay station.Suppose the radio frames for subframe uplink-downlink configuration mode 3, limit the relay sub-frame configuration scheme of 3 kinds of candidates altogether, respectively as shown in a, b, c in Fig. 3, Fig. 3 is the configuration mode structural representation of the relay sub-frame of embodiment two, if the subframe uplink-downlink configuration mode of the current configuration of system is configuration mode 3, when having the demand of transfer of data between base station and relay station, base station is chosen a kind of configuration mode as current relay sub-frame according to information such as the possible traffic carrying capacitys of relay station and notifies relay station in kind of the relay sub-frame configuration mode of three shown in Fig. 3.
In this example, for three kinds of relay sub-frame configuration modes, determine the downlink relay sub-frame carrying relay link downlink ACK/NACK information respectively.And for each relay sub-frame configuration mode, the corresponding relation between repeated link uplink traffic transmission and downlink feedback information transmit determines.For relay sub-frame configuration mode a, according to the ACK/NACK feedback system specified in TDDLTE agreement, transmit uplink business data in sub-frame of uplink 3, its feedback information will feed back in descending sub frame 9.But, in this example, descending sub frame 9 is descending common subframes, namely relay station sends business datum and the signal that cannot receive from base station to subordinate UE in subframe 9, if therefore continue to use the ACK/NACK feedback specified in existing TDD LTE protocol to determine mode, after relay station sends business datum to base station in subframe 3, relay station cannot receive corresponding feedback information ACK/NACK.The present invention, for the configuration mode a of relay sub-frame, determines the transmission subframe of new subframe as downlink feedback information for trunk link in downstream in stepchild's frame.Such as, determine that subframe 7 is the transmission subframe of new downlink feedback information for trunk link, after namely relay station sends business datum to base station in subframe 3, base station will send corresponding feedback information ACK/NACK in descending sub frame 7.For relay sub-frame configuration mode b, the descending ACK/NACK feedback of repeated link is according to the ACK/NACK feedback system specified in TDDLTE agreement, and namely in uplink relay subframe 3, the corresponding ACK/NACK feedback information of business datum transmits in stepchild's frame 9 in downstream.For relay sub-frame configuration mode c, according to the ACK/NACK feedback timing specified in TDDLTE agreement, in sub-frame of uplink 3,4, the respective feedback information of business transmission is fed back in the descending sub frame 0 of descending sub frame 9 and next radio frames.Because descending sub frame 0 is non-relay sub-frame, therefore, need to determine new downlink feedback information for trunk link transmission subframe.Such as, the corresponding downlink feedback information of uplink relay business data transmission in uplink relay subframe 4 can be carried in downlink relay sub-frame 9 equally and feed back.
In this example, the configuration of relay sub-frame is semi-static, and for subframe uplink-downlink configuration mode 3, limits the relay sub-frame configuration mode of three kinds of candidates altogether.That is, when needing the transfer of data of repeated link, base station is determined one and is notified relay station in these three kinds of subframe configuration modes.Relay station according to relay sub-frame configuration scheme, determines the transmission means of downlink feedback information for trunk link ACK/NACK after obtaining relay sub-frame configuration information.Also namely, downlink feedback information for trunk link subframe is carried corresponding with relay sub-frame configuration mode.Base station side, before selected sub-frame configuration mode changes, need not notify relay station constantly, only notifies relay station when selected sub-frame configuration mode changes.Relay station side is configured with the sub-frame information of loading ACK/NACK in relay sub-frame configuration mode and this sub-frame configuration mode, once determine relay sub-frame configuration mode, relay station can determine the sub-frame information carrying relay link downlink ACK/NACK information, monitors ACK/NACK in the subframe of corresponding loading ACK/NACK.
When base station is NACK according to the feedback information that the check results of data produces, base station also can send feedback information NACK to relay station, and retransmit by sending uplink authorization (ULgrant) message scheduling relay station to relay station, replace relay link downlink NACK feedback information with this.
Embodiment three
A part of uplink and downlink subframe in radio frames is configured to be used as to communicate between base station and relay station, and this configuration mode is dynamic.Dynamically so-called, refer to the radio frames for certain subframe uplink-downlink configuration mode, base station is carried out the configuration of relay sub-frame in real time and is notified relay station.When namely communicating between base station and relay station, base station configures relay sub-frame in real time by according to information such as the possible traffic carrying capacitys of relay station.This example illustrates technical scheme of the present invention further in the subframe uplink-downlink configuration mode 3 in table 1.
For the wireless sub-frame of subframe uplink-downlink configuration mode 3, two kinds of possible relay sub-frame configuration modes are listed in this example, respectively as shown in a, b in Fig. 4, Fig. 4 is the configuration mode structural representation of the relay sub-frame of embodiment three, four, the bearing mode of relay link downlink ACK/NACK information is indicated to relay station by base station, and relay station determines according to the instruction of base station the subframe position receiving relay link downlink ACK/NACK feedback information.For relay sub-frame configuration mode a, feed back timing relationship according to the ACK/NACK specified in TDDLTE agreement, in sub-frame of uplink 3, the respective feedback information of business transmission will be fed back in descending sub frame 9.But, in this example, subframe 9 is descending common subframes, namely relay station sends business datum and the signal that cannot receive from base station to the UE of its subordinate in subframe 9, if therefore according to the bearing mode specified in existing TDD LTE protocol, relay station will be caused cannot to receive corresponding feedback information ACK/NACK.Therefore, according to method of the present invention, in stepchild's frame, determine the transmission subframe of new subframe as downlink feedback information for trunk link in downstream.Such as, in this example, determine that subframe 7 is the transmission subframe of new downlink feedback information for trunk link, after namely base station receives the business datum of relay station in subframe 3, in descending sub frame 7, corresponding feedback information ACK/NACK will be sent to relay station.
In this example, the subframe position that relay station receives downlink feedback information for trunk link is indicated to relay station by base station.Such as, the subframe position of uplink authorization information to relay station instruction receiving feedback information of relay station is passed through in base station.Be specially, base station sends uplink authorization information to relay station in certain downlink relay sub-frame, stands in uplink relay subframe 3 send business datum to base station with dispatching of relays.In this uplink authorization information, increase information bit, instruction relay station receives the subframe position of downstream feedback simultaneously.Such as, the information bit of increase is 2bits, for representing the side-play amount of relay link downlink feedback subframe position relative to uplink business data transmission subframe position.00 expression does not offset, i.e. first the downlink relay sub-frame receiving feedback information of relay station after the relay sub-frame sending uplink service; 01 represents skew 1 subframe, i.e. second the downlink relay sub-frame receiving feedback information of relay station after the relay sub-frame sending uplink service; 10,11 represent skew 2,3 subframes respectively, and concrete meaning is analogized according to aforementioned.Here side-play amount be relative to uplink relay subframe after the side-play amount of first downlink relay sub-frame, namely offset-lists is shown in relay station to the side-play amount in the downlink relay sub-frame that base station sends after business datum, for Fig. 4 b, relay station sends after business datum to base station in uplink relay subframe 4, next 3 downlink relay sub-frame are had in present sub-frame, side-play amount is 0, namely expression relay station receives the subframe of downstream feedback is ensuing first downlink relay sub-frame 7, to be 1 expression be side-play amount in subframe 7 downlink relay sub-frame backward, offset a subframe relative to subframe 7, namely downlink feedback information is received in stepchild's frame 8 in downstream.
In this example, for relay sub-frame configuration mode a, when base station sends uplink authorization information to relay station, be 00 by feedback position indicating positions simultaneously, represent first the downlink relay sub-frame receiving feedback information of relay station after the subframe sending uplink business data.After relay station receives uplink authorization information, in uplink relay subframe 3, send business datum to base station, and go to receive corresponding feedback information ACK/NACK in stepchild's frame 7 in downstream according to the instruction of feedback position.
For relay sub-frame configuration mode b, according to the ACK/NACK bearing mode specified in TDDLTE agreement, in sub-frame of uplink 3,4, the feedback information of service data transmission will be carried in the descending sub frame 0 of descending sub frame 9 and next radio frames.Due to the non-relay sub-frame of descending sub frame 0, therefore need to determine new downlink feedback information for trunk link transmission subframe.Such as, be similar to the processing mode to configuration mode a, base station is when dispatching of relays stands in the business of uplink relay subframe 4, be 10 by feedback position indicating positions in uplink authorization information, after relay station receives this uplink authorization information, send business datum in uplink relay subframe 4, and for the repeated link uplink business data in subframe 4, base station sends corresponding feedback information in stepchild's frame 9 in downstream.
In this example, the configuration of relay sub-frame is dynamic, and that is, when there being the communication requirement of repeated link, base station is determined the configuration mode of relay sub-frame and notified relay station.Relay station determines the carrying subframe of downlink feedback information for trunk link ACK/NACK after obtaining relay sub-frame configuration information according to the instruction of base station uplink authorization information.
When base station is NACK according to the feedback information that the check results of data produces, base station also can send feedback information NACK to relay station, and retransmit by sending uplink authorization (ULgrant) message scheduling relay station to relay station, replace relay link downlink NACK feedback information with this.
Embodiment four
A part of uplink and downlink subframe in radio frames is configured to be used as to communicate between base station and relay station.When namely communicating between base station and relay station, base station configuration relay sub-frame also indicates to relay station.This example illustrates technical scheme of the present invention further in the subframe uplink-downlink configuration mode 3 in table 1.
In this example, for the radio frames of subframe uplink-downlink configuration mode 3, list two kinds of possible relay sub-frame configuration modes, respectively as shown in a, the b in Fig. 4, relay link downlink ACK/NACK information bearing mode is determined by base station, not to the bearing mode of relay station notice ACK/NACK information, relay station obtains relay link downlink ACK/NACK feedback information by monitoring each downlink relay sub-frame.According to the ACK/NACK feedback system specified in TDDLTE agreement, transmit uplink business data in sub-frame of uplink 3, its feedback information will feed back in descending sub frame 9.But, in this example, descending sub frame 9 is descending common subframes, namely relay station sends business datum and the signal that cannot receive from base station to subordinate UE in subframe 9, if therefore continue to use the ACK/NACK feedback specified in existing TDD LTE protocol to determine mode, after relay station sends business datum to base station in subframe 3, relay station cannot receive corresponding feedback information ACK/NACK.The present invention, for the configuration mode a of relay sub-frame, determines the transmission subframe of new subframe as downlink feedback information for trunk link in downstream in stepchild's frame.Such as, determine that subframe 7 is the transmission subframe of new downlink feedback information for trunk link.After relay station sends business datum to base station in subframe 3, by monitoring the follow-up all downlink relay sub-frame of subframe 3, in descending sub frame 7, receive corresponding feedback information ACK/NACK.
For relay sub-frame configuration mode b, according to the ACK/NACK feedback timing specified in TDDLTE agreement, in sub-frame of uplink 3,4, the feedback information of business datum will be carried in the descending sub frame 0 of descending sub frame 9 and next radio frames.Due to the non-relay sub-frame of descending sub frame 0, the carrying subframe of new downlink feedback information for trunk link therefore need be determined equally.Be similar to the processing mode to configuration mode a, for the relay uplink business datum in uplink relay subframe 3,4, base station sends corresponding feedback information in stepchild's frame 9 in downstream.Relay station monitors each downlink relay sub-frame follow-up to obtain feedback information by starting send business datum to base station in uplink relay subframe 3,4 after.In this example, relay station receives corresponding feedback information in stepchild's frame 9 in downstream.
In this example, after relay station obtains relay sub-frame configuration information, need not determine which downlink relay sub-frame the feedback information of uplink business data is carried in, but by monitoring each downlink relay sub-frame to obtain the respective feedback information ACK/NACK of uplink relay business datum.Meanwhile, consider the processing delay of base station to the uplink relay business received, relay station starts the subframe position of the subframe and the up transmission business datum of relay station monitoring ACK/NACK preferably from subframe place, four, interval.Here, the number of subframes at institute interval is only exemplary explanation, and can be set to five or six etc., the object arranging four monitors time delay preferably to arrange.Such as, relay station sends after business datum to base station in uplink relay subframe 4 in this example, monitors corresponding descending ACK/NACK feedback information from downlink relay sub-frame 8 place.This introns frame number is configured in relay station side by stipulated form, and base station is by loading ACK/nack message in certain downlink relay sub-frame of the subframe of at least four after receiving uplink relay subframe.
When base station is NACK according to the feedback information that the check results of data produces, base station also can send feedback information NACK to relay station, and retransmit by sending uplink authorization (ULgrant) message scheduling relay station to relay station, replace relay link downlink NACK feedback information with this.
Embodiment five
Because relay station needs to send broadcast, paging, the information such as synchronous to the UE of its subordinate in subframe 0,1,5,6, the subframe 0,1,5,6 therefore in radio frames can not as relay sub-frame.But in the radio frames adopting subframe uplink-downlink configuration mode 0, except subframe 0,1,5,6, do not have available downlink resource to send business datum for base station to relay station; In the radio frames adopting subframe uplink-downlink configuration mode 5, only have a sub-frame of uplink, relay station needs the upstream data receiving its subordinate UE in the burst, so there is no available ascending resource and sends data for relay station to base station.But, in the radio frames of subframe uplink-downlink configuration mode 0, the part of the GP in special subframe S (subframe 1,6) can be used to be used for carrying the data that send to relay station of base station; In subframe uplink-downlink configuration mode 5, the part of the GP in special subframe S (subframe 1) can be used to be used for carrying the data that send to base station of relay station.The structure of special subframe as shown in fig. ib.
In this example, respectively for the radio frames of subframe uplink-downlink configuration mode 0 and 5, the essence of this exemplary scenario is described in detail.
Fig. 5 is the configuration mode structural representation of the repeated link resource of embodiment five, for the radio frames of subframe uplink-downlink configuration mode 0, suppose that No. n is configured to be used as relay resource with the GP part resource in the subframe 1 and 6 of n+1 radio frames, subframe 3 and 8 is configured to be used as uplink relay subframe, as shown in a in Fig. 5, wherein, as hereinbefore, the DL-B just in this example only has middle a part of symbol (GP) to send data as base station to relay station to the implication of DL-B and UL-B.
In this example, the descending ACK/NACK information bearing mode of repeated link is arranged in advance between base station and relay station.Concrete, after agreement relay station sends business datum to base station, meet at first first relay link downlink being more than or equal to four subframes with repeated link uplink traffic transmission sub-frame interval and transmit receiving feedback information ACK/NACK in subframe.Such as, in this example, relay station sends after business datum to base station in sub-frame of uplink 3, if according to the regulation of existing TDD LTE protocol, cannot receive corresponding feedback information.The present invention determines that the subframe 1 of next radio frames is new downlink feedback information transmission subframe, after namely relay station sends business datum to base station in the subframe 3 of n radio frames, in the subframe 1 of n+1 radio frames, receives corresponding feedback information ACK/NACK.In like manner, for the transmission of the business datum in the uplink relay subframe 8 of n radio frames, base station sends corresponding ACK/NACK feedback information by the repeated link resource in the subframe 6 of n+1 radio frames, and relay station receives corresponding feedback information ACK/NACK in the burst.
For the wireless sub-frame of subframe uplink-downlink configuration mode 5, suppose that the GP part resource in the subframe 1 of n radio frames is configured to be used as relay station sends resource from data to base station, subframe 7,8 and 9 is configured to be used as downlink relay sub-frame, as shown in the b in Fig. 5, as hereinbefore, just in this example, UL-B only has middle a part of symbol (GP) to send the resource of data to base station as relay station to the implication of DL-B and UL-B.
In this example, relay link downlink ACK/NACK information bearing mode is appointed in advance between base station and relay station.Appoint that relay station sends after business datum to base station, meet at first the relay link downlink being more than or equal to 4 subframes with repeated link uplink traffic transmission sub-frame interval and transmit in subframe and carry feedback information ACK/NACK.After relay station sends business datum to base station in the subframe 1 of n radio frames in this example, in the downlink relay sub-frame 7 of n radio frames, receive corresponding feedback information ACK/NACK.
When base station is NACK according to the feedback information that the check results of data produces, base station also can send feedback information NACK to relay station, and retransmit by sending uplink authorization (ULgrant) message scheduling relay station to relay station, replace relay link downlink NACK feedback information with this.
Fig. 6 is the composition structural representation of the transmitting device of downlink feedback information for trunk link of the present invention, as shown in Figure 6, in time division duplex advanced long-term evolution system of the present invention, the transmitting device of downlink feedback information for trunk link comprises the first determining unit 60, second determining unit 61 and carries and transmission unit 62, wherein, when first determining unit 60 carries for the mode determined the configuration of the relay sub-frame in radio frames and make the downlink feedback information of repeated link cannot specify according to time division duplex Long Term Evolution agreement, trigger the second determining unit 61; Second determining unit 61 determines the new bearing mode of the downlink feedback information of described repeated link for the configuration of the relay sub-frame according to described radio frames; Carrying and transmission unit 62 are for carrying by described new bearing mode and transmitting described downlink feedback information.Described new bearing mode is see the associated description of previous embodiment one to embodiment five.Wherein, described downlink feedback information confirms ACK information or non-acknowledgement nack message.
As shown in Figure 6, apparatus of the present invention also comprise notification unit 63, for the relay sub-frame information of described radio frames and/or described new bearing mode are notified described relay station.
As shown in Figure 6, apparatus of the present invention also comprise the 3rd determining unit 64 and transmitting element 65, wherein, when the 3rd determining unit 64 is for determining that described downlink feedback information is nack message, trigger transmitting element 65; Transmitting element 65 carries out information re-transmission for sending uplink authorization information dispatching of relays station directly to relay station, and does not send described nack message.
It will be appreciated by those skilled in the art that notification unit 63, the 3rd determining unit 64 and transmitting element 65 not realize the essential features of Fig. 6 shown device, are only its optimisation technique features.
It will be appreciated by those skilled in the art that the practical function of each processing unit in the device shown in Fig. 6 can refer to the associated description in embodiment one to embodiment five and understands.In device shown in Fig. 6, the function of each unit realizes by the program run on processor, also realizes by concrete logical circuit.
The above, be only preferred embodiment of the present invention, be not intended to limit protection scope of the present invention.
Claims (21)
1. a transmission method for downlink feedback information for trunk link, is characterized in that, comprising:
When the mode that the configuration of the relay sub-frame in radio frames makes the downlink feedback information of repeated link cannot specify according to time division duplex Long Term Evolution agreement carries, system determines the new bearing mode of described downlink feedback information for trunk link according to the configuration of the relay sub-frame of described radio frames, and base station carries according to described new bearing mode and transmits described downlink feedback information; Wherein,
Described new bearing mode comprises: the indicating bit arranging the relay sub-frame position carrying described downlink feedback information, the relay sub-frame positional information of the described downlink feedback information of described indicating bit instruction carrying;
The configuration of described relay sub-frame is static, or described relay sub-frame is configured by semi-static or dynamic mode by base station.
2. method according to claim 1, is characterized in that, described method also comprises:
The relay sub-frame configuration information of described radio frames and/or described new bearing mode are notified described relay station by described base station.
3. method according to claim 1 and 2, is characterized in that, described new bearing mode comprises: arrange respectively to carry the timing relationship between described downlink feedback information and uplink traffic transmission according to the configuration mode of often kind of relay sub-frame in radio frames.
4. method according to claim 1 and 2, is characterized in that, described indicating bit directly indicates the relay sub-frame number carrying described downlink feedback information.
5. method according to claim 1 and 2, it is characterized in that, the side-play amount of the relay sub-frame of the described downlink feedback information of described indicating bit instruction carrying, described side-play amount is subframe carry described downlink feedback information transmits subframe side-play amount relative to repeated link uplink business data;
Or described side-play amount is the subframe that the carries described downlink feedback information side-play amount relative to first downlink relay sub-frame after repeated link uplink business data transmission subframe.
6. method according to claim 1 and 2, is characterized in that, described indicating bit is carried in the control signal that described base station sends to described relay station.
7. method according to claim 1, is characterized in that, described new bearing mode comprises: the relay sub-frame carrying described downlink feedback information is first downlink relay sub-frame after uplink relay business transmission subframe after amount subframe.
8. method according to claim 1 and 2, is characterized in that, described method also comprises:
Described relay station obtains described downlink feedback information by monitoring each downlink relay sub-frame.
9. method according to claim 1 and 2, is characterized in that, the subframe carrying described downlink feedback information and uplink relay business datum comprises the special subframe with uplink and downlink timeslot and protection interval.
10. method according to claim 9, is characterized in that, described downlink feedback information confirms ACK information or non-acknowledgement nack message.
11. methods according to claim 10, is characterized in that, described method also comprises:
When described base station determines that described downlink feedback information is nack message, send uplink authorization information dispatching of relays station directly to relay station and carry out the re-transmission of repeated link uplink service, and do not send described nack message.
The transmitting device of 12. 1 kinds of downlink feedback information for trunk links, is characterized in that, comprising:
First determining unit, during for determining that the mode that the configuration of the relay sub-frame in radio frames makes the downlink feedback information of repeated link cannot specify according to time division duplex Long Term Evolution agreement carries, triggers the second determining unit;
Second determining unit, the new bearing mode of the downlink feedback information of described repeated link is determined in the configuration for the relay sub-frame according to described radio frames; And
Carrying and transmission unit, for carrying by described new bearing mode and transmitting described downlink feedback information; Wherein,
Described new bearing mode comprises: the indicating bit arranging the relay sub-frame carrying described downlink feedback information, and described indicating bit dynamically indicates the relay sub-frame positional information carrying described downlink feedback information;
The configuration of described relay sub-frame is static, or described relay sub-frame is configured by semi-static or dynamic mode by base station.
13. devices according to claim 12, is characterized in that, described device also comprises:
Notification unit, for notifying described relay station by the relay sub-frame information of described radio frames and/or described new bearing mode.
14. devices according to claim 12 or 13, it is characterized in that, described new bearing mode comprises: arrange respectively to carry the timing relationship between described downlink feedback information and repeated link uplink traffic transmission according to the configuration mode of often kind of relay sub-frame in radio frames.
15. devices according to claim 12 or 13, it is characterized in that, described indicating bit directly indicates the relay sub-frame number carrying described downlink feedback information.
16. devices according to claim 12 or 13, it is characterized in that, the side-play amount of the relay sub-frame of the described downlink feedback information of described indicating bit instruction carrying, described side-play amount is subframe carry described downlink feedback information transmits subframe side-play amount relative to repeated link uplink business data;
Or described side-play amount is the subframe that the carries described downlink feedback information side-play amount relative to first downlink relay sub-frame after repeated link uplink business data transmission subframe.
17. devices according to claim 12 or 13, it is characterized in that, described indicating bit is arranged in the control signal that base station sends to relay station.
18. devices according to claim 12, is characterized in that, described new bearing mode comprises: the relay sub-frame carrying described downlink feedback information is first downlink relay sub-frame after relay uplink business transmission subframe after amount subframe.
19. devices according to claim 12 or 13, is characterized in that, the subframe carrying described downlink feedback information comprises the special subframe with uplink and downlink timeslot and protection interval.
20. devices according to claim 19, is characterized in that, described downlink feedback information confirms ACK information or non-acknowledgement nack message.
21. devices according to claim 20, is characterized in that, described device also comprises:
3rd determining unit, during for determining that described downlink feedback information is nack message, triggers transmitting element; And
Transmitting element, carries out information re-transmission for sending uplink authorization information dispatching of relays station directly to relay station, and does not send described nack message.
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| CN102036380B (en) * | 2009-09-27 | 2013-07-31 | 电信科学技术研究院 | Method, system and device for receiving downlink feedback information |
| CN102594435B (en) * | 2011-01-11 | 2014-11-05 | 华为技术有限公司 | Relay node subframe configuration method, device and communication system |
| CN102594437B (en) * | 2011-01-12 | 2018-03-23 | 中兴通讯股份有限公司 | A kind of method and system of data transfer |
| CN102820958B (en) * | 2011-06-09 | 2017-08-08 | 中兴通讯股份有限公司 | Newly-increased backhaul subframe ascending HARQ method and device |
| CN103516490A (en) * | 2012-06-29 | 2014-01-15 | 电信科学技术研究院 | TDD uplink/downlink configuration transmission feedback method and device |
| CN106031267B (en) * | 2014-09-26 | 2019-10-11 | 宇龙计算机通信科技(深圳)有限公司 | Data transmission method, system and the equipment with base station functions |
| CN115694586A (en) * | 2021-07-30 | 2023-02-03 | 维沃移动通信有限公司 | Signal transmission method, amplifier and network side equipment |
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