CN101499894B - Uplink scheduling method in time division duplex system - Google Patents
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Abstract
The invention discloses an upstream scheduling method of a time division duplex system, which forms a bound subframe by binding at least two upstream subframes of a radio frame, and establishes a corresponding relation which contains a one-to-one corresponding relation between the bound subframe and an upstream scheduling signal. The upstream scheduling method of the time division duplex system comprises the following steps: the upstream scheduling signal is received; according to the established corresponding relation, information of the bound subframe which is corresponding to the received upstream scheduling signal is determined, and the corresponding bound subframe is scheduled. The upstream scheduling method of the time division duplex system can realize the scheduling of at least two upstream subframes by a single upstream scheduling signal.
Description
Technical field
The present invention relates to data transmission technology, the uplink dispatch method in particularly a kind of TDD (TDD, Time DivisionDuplexing) system.
Background technology
3G (Third Generation) Moblie (3G, 3
RdGeneration) adopt code division multiple access (CDMA, Code-Division Multiple Access) mode, support multimedia service, higher competitiveness is arranged in several years of future.In order to ensure in the longer time, making 3G keep this competitiveness, third generation partnership plan (3GPP, Third Generation Partnership Project) started the Long Term Evolution (LTE of 3G wireless interface technology, Long Term Evolution) research project, it comprise reduce time delay, improve user data rate, improve power system capacity and covering, pith such as reduction operator cost.
At present, the frame structure of the LTE project support comprises two classes.
1) first kind frame structure is applicable to TDD system and Frequency Division Duplexing (FDD) (FDD, FrequencyDivision Duplexing) system, and Fig. 1 shows this frame structure.The frame length of radio frames is 10 milliseconds (ms), is made up of 20 time slots, and each slot length is 0.5ms, is labeled as #0～#19 in Fig. 1.Two time slots are defined as a subframe.
The transmission of signal comprises among the 3G: by the base station to the transmission (being called down link) of terminal with by the transmission (being called up link) of terminal to base station.Based on above-mentioned first kind frame structure, for the FDD system, separately, therefore up link and down link each have 10 subframes and can use in every 10ms time on frequency domain for up link and down link.And for the TDD system, up link and downlink shared 10 subframes in every 10ms time, each subframe or distribute to up link or distribute to down link, the subframe of distributing to up link is called sub-frame of uplink, the subframe of distributing to down link is called descending sub frame, when sub-frame of uplink equates with descending sub frame quantity, the data rate of up link and down link is identical, when sub-frame of uplink and descending sub frame are unequal, can satisfy the different data-rate requirements of uplink downlink.
2) the second class frame structure is the optimization frame structure of a kind of TDD of being only applicable to system, and Fig. 2 shows this frame structure.Wireless frame length in this optimization frame structure is 10ms; each radio frames is split into the field of 2 5ms; the field of each 5ms is divided into conventional time slot and 1 special time slot that length is 1ms that 8 length are 0.5ms; this special time slot is by descending pilot frequency time slot (DwPTS; Downlinkpilot time slot), uplink pilot time slot (UpPTS; Uplink pilot time slot) and protection at interval (GP, Guard period) form, per two conventional time slots are composed of a subframe.
Similarly, based on this optimization frame structure, the up-downgoing of TDD system has 10 subframes and can use, and the subframe of distributing to up link is called sub-frame of uplink, and the subframe of distributing to down link is called descending sub frame.
In the TDD system, the descending control signaling indication that the professional transmission of uplink downlink need be sent by the base station, the indication of the descending control signaling that terminal is sent according to the base station is dispatched the sub-frame of uplink in the radio frames, and this process also can be called uplink scheduling.The descending control signaling that above-mentioned base station sends comprises following three parts:
The first, physical control channel format indication channel (PCFICH, Physical control formatindicator channel), this channel is present in each descending sub frame, carry 2 bit informations, be used for OFDM (OFDM) symbolic number of indicating place subframe descending control signaling shared;
The second, the automatic request retransmission indicating channel of physical mixed (PHICH, Physical hybrid-ARQindicator channel), this channel is present in each descending sub frame, be used to indicate mixing to retransmit (HARQ automatically for ul transmissions, Hybrid Automatic Repeat reQuest) response message of process, promptly confirm (Acknowledgement) or non-affirmation (NACK, NonAcknowledgement) message;
Three, Physical Downlink Control Channel (PDCCH, Physical downlink control channel), this channel is present among the DwPTS of each descending sub frame and special time slot, and its OFDM symbol quantity shared in subframe is indicated by above-mentioned PDFICH.Information such as bearing downlink dispatch (DLgrant), uplink scheduling signaling (UL grant) and power control among the PDCCH, the business transmission of uplink downlink is indicated by above-mentioned descending scheduling signaling and uplink scheduling signaling, wherein can the dispatching downlink subframe according to the indication of descending scheduling signaling, carry out downlink traffic transmission, can the dispatching uplink subframe according to the indication of uplink scheduling signaling, carry out uplink traffic transmission.
For the FDD system, its uplink downlink separates at frequency domain, comprise the frequency domain position information of scheduling resource in uplink scheduling signaling and the descending scheduling signaling, but do not comprise the corresponding relation with time domain, so determine the corresponding relation of time domain by the definition relative time delay.Fig. 3 shows the dispatch sequential corresponding relation of FDD system, wherein the indication of heavy line arrow is the uplink scheduling signaling, what the fine line arrow was indicated is the descending scheduling signaling, what dotted arrow was indicated is the subframe of uplink scheduling signaling and descending scheduling signaling scheduling, also marked the downlink data of descending sub frame carrying among the figure, and the upstream data of sub-frame of uplink carrying.This subframe of descending scheduling signaling scheduling as can be seen, and the sub-frame of uplink after the uplink scheduling signaling scheduling constant time lag.
For the TDD system, the same in the sequential relationship of descending scheduling and the FDD system, it is exactly this subframe of descending scheduling signaling scheduling, but because the time of TDD system is discontinuous, support is multiple is that uplink downlink distributes the mode of subframe and the subframe in the shared radio frames of uplink downlink, therefore can't determine the uplink scheduling sequential by setting a simply time-delay relation in uplink scheduling.
Uplink scheduling sequential when Fig. 4 shows descending sub frame more than sub-frame of uplink, wherein to indicate current subframe be sub-frame of uplink to the short solid arrow that makes progress of each subframe inside, it is descending sub frame that the inner downward short solid arrow of each subframe is indicated current subframe, if order is each subframe numbering, if sequence number is 0～9, then subframe 0～subframe 1, subframe 4～subframe 6, subframe 9 are descending sub frame, remain to be sub-frame of uplink.Suppose in the TDD system that minimum time-delay needs to guarantee 3ms, promptly need to guarantee the time-delay of at least 3 subframe lengths, the uplink scheduling signaling scheduling subframe 7 in the subframe 1 then, time-delay is 5 subframes, the uplink scheduling signaling scheduling subframe 8 in the subframe 4, time-delay is 3 subframes.As seen, during more than sub-frame of uplink,, but can concern the one-to-one relationship of setting up uplink scheduling signaling and sub-frame of uplink at descending sub frame by defining different time-delays though the time-delay of the uplink scheduling signaling of different subframes may be inconsistent.
Uplink scheduling sequential when Fig. 5 shows descending sub frame and is less than sub-frame of uplink, still order is each subframe numbering, sequence number is 0～9, wherein subframe 0～subframe 1, subframe 5～subframe 6 is a descending sub frame, residue is sub-frame of uplink, suppose that minimum time-delay still needs to guarantee 3ms in the TDD system, promptly need to guarantee the time-delay of at least 3 subframe lengths, the uplink scheduling signaling scheduling subframe 4 in the subframe 0 then, time-delay is 5 subframes, uplink scheduling signaling scheduling subframe 7 in the subframe 1, time-delay is 6 subframes, but subframe 8 must be by the scheduling of the descending sub frame before the subframe 4 for the requirement of 3ms for satisfying minimum time-delay, but the descending sub frame before the subframe 4 includes only subframe 0 and subframe 1, and the uplink scheduling signaling of carrying all is responsible for the scheduling of other sub-frame of uplink in subframe 0 and the subframe 1, so when descending sub frame is less than sub-frame of uplink, can't all set up relation one to one for all sub-frame of uplink and uplink scheduling signaling, can't can't be scheduled with the sub-frame of uplink that the uplink scheduling signaling is set up corresponding relation.
When being less than sub-frame of uplink in order to solve above-mentioned descending sub frame, the problem that uplink scheduling occurs in the TDD system, a kind of solution thinking has been proposed at present, use the uplink scheduling signaling of carrying in the descending sub frame, dispatch at least two sub-frame of uplink, this method need increase in the uplink scheduling signaling and two indication informations that sub-frame of uplink is corresponding at least, corresponding sub-frame of uplink number is many more, the expense that is used for indication information is big more, this has increased the expense that takies, and, the present specific implementation method that does not also propose this solution.
Summary of the invention
The invention provides the uplink dispatch method in a kind of TDD system, use this method can realize at least two sub-frame of uplink of uplink scheduling signaling scheduling that carry in the descending sub frame.
Uplink dispatch method in a kind of TDD system is bound at least two sub-frame of uplink in the radio frames, forms the binding subframe, sets up corresponding relation, and described corresponding relation comprises the one-to-one relationship between binding subframe and the uplink scheduling signaling; This method comprises:
Receive the uplink scheduling signaling;
According to the corresponding relation of setting up, determine the information of the binding subframe corresponding, the corresponding binding of scheduling subframe with the uplink scheduling signaling that receives.
As seen, uplink dispatch method in the TDD provided by the invention system, this method is set up the one-to-one relationship between binding subframe and the uplink scheduling signaling, described binding subframe comprises at least two sub-frame of uplink in the radio frames, like this, after the reception uplink scheduling signaling, according to the corresponding relation of setting up, determine the information of the binding subframe corresponding, just can dispatch corresponding binding subframe with the uplink scheduling signaling that receives.Thereby, under the prerequisite that does not increase the subframe indication information, realized at least two sub-frame of uplink of a uplink scheduling signaling scheduling.
Description of drawings
Fig. 1 is a first kind frame structure schematic diagram of the prior art;
Fig. 2 is the second class frame structure schematic diagram of the prior art;
Fig. 3 is the dispatch sequential corresponding relation schematic diagram in the FDD system;
Fig. 4 is first kind of dispatch sequential corresponding relation schematic diagram in the TDD system;
Fig. 5 is second kind of dispatch sequential corresponding relation schematic diagram in the TDD system;
Fig. 6 is the exemplary process diagram of the uplink dispatch method in the TDD of the present invention system;
Fig. 7 is the structural representation of the radio frames of 5ms for the cycle;
Fig. 8 (a) is the inventive method in conjunction with the schematic diagram of uplink scheduling signaling in first kind of situation behind the hypothesis application scenarios with the sequential corresponding relation of binding subframe;
Fig. 8 (b) for the inventive method in conjunction with the hypothesis application scenarios after the schematic diagram that should concern sequential of uplink scheduling signaling and binding subframe in second kind of situation;
Fig. 9 is the schematic diagram of the sequential corresponding relation of PHICH and sub-frame of uplink in the application scenarios of Fig. 8 (a).
Embodiment
For making objects and advantages of the present invention clearer, the present invention is further detailed explanation below in conjunction with drawings and Examples.
Fig. 6 is the exemplary process diagram of the uplink dispatch method in the TDD of the present invention system, this method is bound at least two sub-frame of uplink in the radio frames, form the binding subframe, set up corresponding relation, described corresponding relation comprises the one-to-one relationship between binding subframe and the uplink scheduling signaling; This method is further comprising the steps of:
Step 601 receives the uplink scheduling signaling.
Step 602 according to the corresponding relation of setting up, is determined the information of the binding subframe corresponding with the uplink scheduling signaling that receives, the corresponding binding of scheduling subframe.
The corresponding uplink scheduling signaling of at least two subframes that bind together, corresponding described uplink scheduling signaling can be the uplink scheduling signaling in the descending sub frame, also can be the uplink scheduling signaling of the descending pilot frequency time slot in the special time slot.The encoding block of described at least two sub-frame of uplink transmission can be the different redundancy versions of same data block, promptly same data block is carried out two different coding pieces behind the different coding; Also can be that same data block is carried out two same-code pieces behind the same-code; It can also be a data encoding block.After receiving the uplink scheduling signaling, just can dispatch corresponding binding subframe according to the corresponding relation of setting up, like this, need not increases indication information in the uplink scheduling signaling, has realized at least two sub-frame of uplink of a uplink scheduling signaling scheduling.
When only comprising the unbundling subframe in the radio frames, the corresponding relation of foundation only comprises the one-to-one relationship between unbundling subframe and the uplink scheduling signaling.
When comprising binding subframe and unbundling subframe in the radio frames, the corresponding relation of foundation not only comprises the one-to-one relationship between binding subframe and the uplink scheduling signaling, also comprises the one-to-one relationship between unbundling subframe and the uplink scheduling signaling; The sub-frame of uplink of described unbundling subframe for not binding.After receiving the uplink scheduling signaling, according to the corresponding relation of setting up, be the information of binding subframe if determine corresponding with the uplink scheduling signaling that receives, the corresponding binding of scheduling subframe then; If what the uplink scheduling signaling of determining and receiving was corresponding is the information of unbundling subframe, then dispatch corresponding unbundling subframe.
In the LTE standard progress of current TDD system, widespread usage is optimized frame structure, is example with this frame structure, if represent descending sub frame with DL, represents sub-frame of uplink with UL, and the sequential ratio of determining comprises at present:
, can comprise: 1DL: 3UL, 2DL: 2UL, 3DL: 1UL during with 5ms as one-period;
, can comprise: 6DL: 3UL, 7DL: 2UL, 8DL: 1UL, 3DL: 5UL during with 10ms as one-period.
The descending sub frame number is less than the situation of sub-frame of uplink number in the above-mentioned as can be seen sequential ratio, the 3DL when only comprising the 1DL when being 5ms with the cycle: 3UL and being 10ms with the cycle: 5UL.Wherein 3DL: 5UL is comparatively special, owing to optimize in the frame structure and comprise special time slot, and the DwPTS in the special time slot can control signaling by bearing downlink, when using this frame structure, comprise 2 DwPTS in the one-period, be equivalent to increase the descending sub frame of two carrying uplink scheduling signalings, so in fact the sequential ratio is equivalent to be 5DL: 5UL, also can be according to the situation of descending sub frame more than sub-frame of uplink, concern and realize uplink scheduling by setting up one by one correspondence mappings.When the sub-frame of uplink number is counted more than descending sub frame, based on different frame structures multiple different situation may appear.
Adopt the present invention program below, to 5ms during as one-period the scheduling of the radio frames of 1DL: 3UL describe.At this moment, the application scenarios of supposing is as follows: as one-period, the ratio of descending sub frame and sub-frame of uplink is 1: 3 with 5ms, and this wireless frame structure as shown in Figure 7, here for convenience of explanation, each field is labeled as 5 subframes of #0～#4 respectively, and wherein, subframe 0 is a descending sub frame, subframe 2,3 and 4 is a sub-frame of uplink, subframe 1 is a special time slot, and by DwPTS, GP and UpPTS form.Here suppose DwPTS carrying uplink scheduling signaling, UpPTS does not carry upstream data, just has only subframe 2,3 and 4 carrying upstream datas; And suppose that minimum time-delay needs to guarantee 3ms in the TDD system, promptly need to guarantee the time-delay of at least 3 subframe lengths.
Present embodiment is bound subframe 2 and subframe 3, forms the binding subframe, the corresponding uplink scheduling signaling of this binding subframe, and the corresponding uplink scheduling signaling of hypothesis is the uplink scheduling signaling of the descending pilot frequency time slot in the subframe 0 here, delaying time is 5ms; The subframe 4 of the corresponding time-delay of uplink scheduling signaling in the subframe 0 3ms.
The subframe 2 and subframe 3 data carried by data that are bundled in together can be above two kinds of situations:
1, subframe 2 is identical with the original source of data carried by data in the subframe 3, and this original source is carried out identical coding or different codings, obtains two data blocks behind the coding, is carried on respectively in subframe 2 and the subframe 3 and transmits, shown in Fig. 8 (a).
The subframe 4 of uplink scheduling signaling scheduling time-delay 3ms among Fig. 8 (a) in the descending sub frame 0; Subframe that binds together 2 and the subframe 3 of the uplink scheduling signaling scheduling of descending pilot frequency time slot time-delay 5ms in the subframe 1.
Because subframe 2 is identical with the original source of the encoding block of subframe 3 carryings, no matter subframe 2 is two identical encoding blocks with subframe 3 data carried by data pieces, still is encoding block inequality, and the base station receives after subframe 2 and the subframe 3, can only decode subframe 2, obtain original source; Perhaps, only decode subframe 3, obtain original source; Perhaps, subframe 2 and subframe 3 are carried out the combination decoding, obtain original source.
What 2, carry in subframe 2 and the subframe 3 is an encoding block, and an original source of encoding block correspondence of promptly carrying is shown in Fig. 8 (b).
The subframe 4 of uplink scheduling signaling scheduling time-delay 3ms among Fig. 8 (a) in the descending sub frame 0; Subframe that binds together 2 and the subframe 3 of the uplink scheduling signaling scheduling of descending pilot frequency time slot time-delay 5ms in the subframe 1.
Because subframe 2 and subframe 3 carryings is an encoding block, after this encoding block of base station receiving terminal transmission, can only obtain original source in conjunction with subframe 2 and subframe 3 together decode; And can not decode separately by subframe 2 or subframe 3, obtain original source.
Similar said method, if in the wireless frame structure of Fig. 7, the UpPTS carrying upstream data in the special time slot then can be bound subframe 2,3 and 4, the subframe after the binding is corresponding with the uplink scheduling signaling of DwPTS in the subframe 1 before that differs the 5ms time-delay; The upstream data of UpPTS in the subframe 1 of uplink scheduling signaling in the subframe 0 and time-delay 5ms is corresponding. Subframe 2,3 is identical with above-mentioned two kinds of situations with 4 data carried by data, repeats no more here.
Adopt the present invention program,, do not need to increase the subframe indication, and the feedback of PHICH is very simple for the situation of sub-frame of uplink in the radio frames greater than descending sub frame.Referring to Fig. 9, schematic diagram for the sequential corresponding relation of PHICH and sub-frame of uplink in the application scenarios of Fig. 8 (a), here PHICH also needs to guarantee the minimum time-delay of 3ms, like this, the PHICH of DwPTS in the subframe 1 of subframe 4 corresponding time-delay 6ms, terminal can know just that by the ACK message that the PHICH of DwPTS in the subframe 1 of time-delay 6ms comprises the base station receives the situation of corresponding subframe 4; The PHICH of DwPTS in the subframe 1 of subframe 2 after the binding and subframe 3 corresponding time-delay 7ms, the ACK message that the PHICH of terminal by DwPTS in the subframe 1 of time-delay 7ms comprises can know that just the base station receives the situation of corresponding binding subframe.
As seen, only corresponding ACK/NACK of each PHICH among the present invention, i.e. the ACK/NACK message of the ACK/NACK message of the only corresponding upstream data subframe of each PHICH or an only corresponding binding subframe.Like this, in the time of the method that increases subframe sequence number indication information can not occurring adopting, a PHICH needs corresponding problem greater than an ACK/NACK message, makes the feedback of PHICH simple.
The present invention program not only can apply to the radio frames of aforementioned 5ms 1DL: 3UL in the cycle; Can apply to also that the sub-frame of uplink number comprise that radio frames comprises the situation of special time slot, and radio frames does not comprise the situation of special time slot greater than other situations of descending sub frame number in the radio frames; Can also use with radio frames in the sub-frame of uplink number be less than or equal to the situation of descending sub frame number.
Adopt the present invention program, especially when the sub-frame of uplink number of radio frames is counted more than descending sub frame, by at least two sub-frame of uplink are bound, the corresponding uplink scheduling signaling of the binding subframe that forms, after receiving the uplink scheduling signaling, according to the corresponding relation between uplink scheduling signaling and the binding subframe, just can dispatch corresponding binding subframe.Like this, realized at least two sub-frame of uplink of a uplink scheduling signaling scheduling, thereby, need in the uplink scheduling signaling, not increase the indication of subframe sequence number, reduced signaling consumption, reduced the scheduling complexity.
In sum, more than be the preferred embodiment of present embodiment only, be not to be used to limit protection scope of the present invention.Within the spirit and principles in the present invention all, any modification of being done, be equal to replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (8)
1. the uplink dispatch method among the tdd systems TDD, it is characterized in that, at least two sub-frame of uplink in the radio frames are bound, form the binding subframe, set up corresponding relation, described corresponding relation comprises the one-to-one relationship between binding subframe and the uplink scheduling signaling; This method comprises:
Receive the uplink scheduling signaling;
According to the corresponding relation of setting up, determine the information of the binding subframe corresponding, the corresponding binding of scheduling subframe with the uplink scheduling signaling that receives.
2. the method for claim 1, it is characterized in that described radio frames comprises the unbundling subframe, described corresponding relation also comprises the one-to-one relationship between unbundling subframe and the uplink scheduling signaling, after the described reception uplink scheduling signaling, this method also comprises:
According to the corresponding relation of setting up, determine the information of the unbundling subframe corresponding with the uplink scheduling signaling that receives, dispatch corresponding unbundling subframe.
3. the method for claim 1 is characterized in that, the encoding block of described at least two sub-frame of uplink transmission is the different redundancy versions of same data block.
4. the method for claim 1 is characterized in that, the encoding block of described at least two sub-frame of uplink transmission is that same data block is carried out two same-code pieces behind the same-code.
5. the method for claim 1 is characterized in that, what described at least two sub-frame of uplink transmitted is an encoding block.
6. the method for claim 1 is characterized in that, the sub-frame of uplink number of described radio frames is greater than the descending sub frame number.
7. the method for claim 1 is characterized in that, described uplink scheduling signaling is the uplink scheduling signaling in the descending sub frame or the uplink scheduling signaling of the descending pilot frequency time slot in the special time slot.
8. as each described method in the claim 1 to 7, it is characterized in that in the field of described radio frames, subframe 0 is a descending sub frame, subframe 2,3 and 4 is that sub-frame of uplink, subframe 1 are special time slot, and the uplink pilot time slot of described special time slot does not carry upstream data;
Described at least two sub-frame of uplink of binding are subframe 2 and subframe 3, and described scheduling is bound subframe accordingly and comprised: with the uplink scheduling signaling scheduling binding subframe of the descending pilot frequency time slot in the special time slot of preceding field;
This method also comprises: with the uplink scheduling signaling scheduling subframe 4 in the subframe 0.
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| CN101998327B (en) * | 2009-08-21 | 2014-04-02 | 电信科学技术研究院 | Method and equipment for configuring transmission scheme and/or feedback mode |
| CN102045766A (en) * | 2009-10-23 | 2011-05-04 | 中兴通讯股份有限公司 | Method and system for scheduling uplink dual-data stream transmission |
| CN102137504B (en) * | 2011-04-12 | 2016-01-20 | 电信科学技术研究院 | A kind of method of dispatching transmission of multiple sub-frames and device |
| WO2013103280A1 (en) * | 2012-01-06 | 2013-07-11 | 엘지전자 주식회사 | Method and apparatus for allocating channels related to uplink bundling |
| KR20130125695A (en) | 2012-05-09 | 2013-11-19 | 주식회사 팬택 | Method and apparatus for controlling harq-ack index mapping and uplink resource allocation for channel selection transmission in inter-band time division duplex mode |
| CN103546235B (en) * | 2012-07-13 | 2017-04-19 | 电信科学技术研究院 | Uplink data transmitting and receiving method and equipment in time division duplex system |
| CN103825671B (en) * | 2012-11-19 | 2017-03-01 | 电信科学技术研究院 | Transmitting uplink data in tdd systems and method of reseptance and equipment |
| CN104581836B (en) * | 2013-10-29 | 2020-04-28 | 中兴通讯股份有限公司 | Method and equipment for improving anti-range finder interference capability of LTE (Long term evolution) system |
| CN107040347B (en) | 2016-02-03 | 2021-05-25 | 电信科学技术研究院 | Uplink transmission method and device |
| CN107733619A (en) | 2016-08-11 | 2018-02-23 | 中国移动通信有限公司研究院 | A kind of transmission method, device, mobile communication terminal and network side equipment |
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| CN1371584A (en) * | 1999-08-27 | 2002-09-25 | 西门子公司 | Method for allocating transmission resources of uplink of radio transmission |
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