CN103379653A

CN103379653A - Method and device for indicating TD-LTE terminal to receive downlink pilot time slot

Info

Publication number: CN103379653A
Application number: CN2012101301187A
Authority: CN
Inventors: 仲华
Original assignee: ZTE Corp
Current assignee: ZTE Corp
Priority date: 2012-04-27
Filing date: 2012-04-27
Publication date: 2013-10-30
Anticipated expiration: 2032-04-27
Also published as: CN103379653B

Abstract

The invention discloses a method and device for indicating a TD-LTE terminal to receive a downlink pilot time slot. The method and device is used for avoiding a conflict of uplink UpPTS transmitting of the TD-LTE terminal and DwPTS receiving of special subframes. The method includes the steps that if a TA value in a message sent to the TD-LTE terminal is larger than the maximum preset TA threshold value, a close instruction is carried by the message, a network side is absent from a physical downlink shared channel used for the TD-LTE terminal and dispatched by DwPTS, and the close instruction is used for indicating the TD-LTE terminal to close the receiving of the DwPTS. The device comprises a judgment module, a transmitting module and a setting module. According to the method and device, the terminal can determine whether the receiving of the DwPTS is closed in advance according to instructions in RAR and TACE sent by a network, and therefore the situation of the conflict of the transmitting of the UpPTS and the receiving of the DwPTS is avoided.

Description

Indication TD-LTE terminal receives the method and apparatus of descending pilot frequency time slot

Technical field

Mobile communication system of the present invention, be specifically related to LTE (Long Term Evolution, Long Term Evolution) TDD (Time Division Duplexing, time division duplex) indicate TD-LTE (Time Division Long Term Evolution, timesharing Long Term Evolution) terminal to receive the method and apparatus of DwPTS (descending pilot frequency time slot) under the standard.

Background technology

The frame structure of LTE tdd mode as shown in Figure 1; adopt type 2 wireless frame structures; the field that each 10ms radio frames is 5ms by two length consists of; each half frame length is 5ms; formed by 4 data subframes and 1 special subframe; wherein 4 data subframes take 8 conventional time slots, and 1 special subframe comprises DwPTS (descending pilot frequency time slot), GP (protection time slot) and three special time slots of UpPTS (uplink pilot time slot), and total length is 1ms.Wherein the length of DwPTS and UpPTS is configurable, and the length of DwPTS is 3～12 OFDM symbols, and the length of UpPTS is 1～2 OFDM symbol, and corresponding GP length is 1～10 OFDM symbol, and the total length of DwPTS, GP and three time slots of UpPTS is 1ms.UpPTS can be used for uplink, and DwPTS can be used for downlink transfer.

LTE supports 5ms and 10ms up-downgoing switching point.For 5ms up-downgoing switching cycle, as shown in Figure 1, subframe (Subframe) 2 and 7 is always as up.For 10ms up-downgoing switching cycle, each field (half-frame) has DwPTS; Only in the 1st field GP and UpPTS are arranged, the DwPTS length of the 2nd field is 1ms.UpPTS and subframe 2 are as up, and subframe 7 and 9 is as descending.

In the actual deployment of network, can be according to radius of society and BS-BS (Base Station, the base station) disturbed condition, the reasonable disposition special subframe, so that GP reaches that assurance can accept to disturb rank and to timing advance (TA, Timing Advanced) there is not effect, be the GP value greater than the Timing Advance of the Timing Advance of maximum+fixedly+downstream-to-upstream radio frequency switching time, to guarantee can in time decode PDSCH (Physical Downlink Shared Channel, Physical Downlink Shared Channel) and in time switch to the up transmission of UpPTS of user terminal.But because wireless environment is changeable, following situation might occur: the TA that the user receives (timing advance) value can cause the UpPTS of the up transmission of terminal to exceed GP, overlapping with DwPTS, cause terminal or have little time to process DwPTS, it is imperfect perhaps to send upstream data.

Summary of the invention

The technical problem to be solved in the present invention provides the method and apparatus that a kind of TD-LTE of indication terminal receives descending pilot frequency time slot, avoids the reception of TD-LTE terminal up transmission UpPTS and special subframe DwPTS to clash.

For solving the problems of the technologies described above, the invention provides the method that a kind of TD-LTE of indication terminal receives descending pilot frequency time slot, comprising:

If judge that timing advance (TA) value in the message send to the TD-LTE terminal is greater than the maximum TA threshold value of presetting, then in this message, carry and close indication, and network side is not used for this TD-LTE terminal in this DwPTS scheduling Physical Downlink Shared Channel is set, this is closed indication and is used to indicate the reception that the TD-LTE terminal is closed descending pilot frequency time slot (DwPTS).

Further, described method also comprises: be not more than default maximum TA threshold value if judge the TA value in the message that sends to the TD-LTE terminal, then carry in this message and open indication, this unlatching indication is used to indicate the reception that the TD-LTE terminal is opened DwPTS.

Further, before judging, described method also comprises: process indication to TD-LTE terminal broadcast transmission, be used for the indication of closing that notice TD-LTE terminal current area is supported DwPTS.

Further, described default maximum TA threshold value is: guarantee time that the TD-LTE terminal sends uplink pilot time slot (UpPTS) not can with the TA value of the time-interleaving that receives DwPTS.

Further, described message comprises: accidental access response (RAR) message or TA control unit message or newly-increased MAC Control Element message.

For solving the problems of the technologies described above, the present invention also provides a kind of TD-LTE terminal to receive the indicating means of descending pilot frequency time slot, comprising:

The message of TA value is carried in reception, if judging to carry in the message closes indication, then closes the reception of DwPTS, carries out uplink synchronous according to described TA value, sends upstream data.

Further, described method also comprises: open indication, the reception of then opening DwPTS if judge to carry in the message.

Further, before judging, described method also comprises: receive the processing indication of broadcast transmission, this processing indication is used for the indication of closing that the notice current area is supported DwPTS.

For solving the problems of the technologies described above, the present invention also provides a kind of TD-LTE of indication terminal to receive the device of descending pilot frequency time slot, and comprise judge module, sending module and module is set, wherein:

Described judge module: be used for judging that whether the TA value of the message that sends to the TD-LTE terminal is greater than default maximum TA threshold value;

Described sending module, the TA value that is used for judging the message that sends to the TD-LTE terminal at described judge module carry in this message and close indication during greater than default maximum TA threshold value, and this is closed to indicate and is used to indicate the reception that the TD-LTE terminal is closed DwPTS;

The described module that arranges is used for after indication is closed in the sending module transmission, and network side is not used for this TD-LTE terminal in this DwPTS scheduling Physical Downlink Shared Channel is set.

For solving the problems of the technologies described above, the present invention also provides a kind of TD-LTE terminal that receives descending pilot frequency time slot, comprises receiver module, judge module and control module, wherein:

Described receiver module is used for receiving the message of carrying the TA value;

Described judge module is closed indication for judging whether message carries;

Described control module is used for judging that at described judge module message carries when closing indication, closes the reception of DwPTS, carries out uplink synchronous according to described TA value, the transmission upstream data.

Adopt embodiment of the invention method and apparatus, under the scene that the large radius of society under the LTE tdd mode, UE are in cell edge, terminal can be according to the RAR of network transmission and the indication among the TA CE, determine whether to close in advance the reception of DwPTS, correctly send upstream data according to timing advance value, receive the situation of conflicting thereby avoid UpPTS to send with DwPTS.

Description of drawings

Fig. 1 is LTE tdd mode frame assumption diagram;

Fig. 2 is the embodiment of the invention 1 flow chart;

Fig. 3 is TA CE message structure figure;

Fig. 4 is RAR message structure figure;

Fig. 5 is new definition MAC Control Element message structure figure;

Fig. 6 is the embodiment of the invention 2 flow charts;

Fig. 7 is the embodiment of the invention 3 network side apparatus structural representations;

Fig. 8 is the embodiment of the invention 4 end side apparatus structure schematic diagrames;

Fig. 9 is for using example 1 flow chart;

Figure 10 is for using example 2 flow charts.

Embodiment

Find by analysis, the UpPTS that the TA value of receiving when terminal causes terminal to send exceeds GP, have influence on the reception as the DwPTS of PDSCH, because terminal parses PDCCH (Physical Downlink Control Channel, Physical Downlink Control Channel) the existence time-delay that judges whether to exist corresponding own downlink resource to distribute can't be closed DwPTS unlatching uplink in advance; If judge do not have downlink resource to distribute after by the time having resolved PDCCH, then can cause up transmission imperfect.

Therefore, network need to shift to an earlier date the reception that indicating terminal is in time closed DwPTS.When network side judges that if TA value to terminal can cause the up transmission of terminal and DwPTS to receive overlapping possibility, notification terminal is closed the reception of DwPTS in advance, the PDSCH that network side also can not be used in the DwPTS scheduling this terminal avoids the up transmission of terminal to conflict with special subframe DwPTS with this.

For making the purpose, technical solutions and advantages of the present invention clearer, hereinafter in connection with accompanying drawing embodiments of the invention are elaborated.Need to prove that in the situation of not conflicting, the embodiment among the application and the feature among the embodiment be combination in any mutually.

Embodiment 1

Present embodiment is described network side, and how indicating terminal receives DwPTS, as shown in Figure 2, may further comprise the steps:

Step 110, if judge TA value in the message send to the TD-LTE terminal greater than the maximum TA threshold value of presetting, then execution in step 120;

Preferably, before step 110, process indication to TD-LTE terminal broadcast transmission first, be used for the indication of closing that notice TD-LTE terminal current area is supported DwPTS.When network and terminal all give tacit consent to support DwPTS close indication the time, this step can be omitted.

Step 120 is carried in this message and is closed indication, and this is closed indication and is used to indicate the reception that the TD-LTE terminal is closed DwPTS;

Step 130 arranges network side is not used for this terminal in this DwPTS scheduling Physical Downlink Shared Channel (PDSCH).

Above-mentioned steps 120 can be carried out simultaneously with step 130.

Particularly, carry the indication of closing whether indicating user can close the DwPTS reception in advance in TA CE (control element, the timing advance control unit) message that network can send when UE is in the RAR message that sends when attitude is set up in connection or is in connected state.Concrete grammar is as follows:

Network side is for the combination of each sub-frame configuration and special subframe configuration, be arranged on the maximum TA threshold value under this kind combination, in case send to the RAR message of UE or the TA value in the TA message greater than the maximum TA threshold value that arranges, the upstream data that may cause UE to send exceeds GP, when overlapping with DwPTS, in RAR or TA message, the reception that the corresponding bits indicating user can be closed DwPTS is set, according to the ascending resource transmission data of network scheduling.Meanwhile, network side is guaranteed after corresponding bits is set, and is not used for the PDSCH of this UE in the DwPTS scheduling.

When network side judges that the TA value that sends to UE is not more than default maximum TA threshold value, then can in message, carry and open indication, be used to indicate the reception that terminal is opened DwPTS, this moment, network side can be used in this DwPTS scheduling the PDSCH of this UE.

For example, the bit (with reference to 36.321) that first or second reservation of TA CE message can be set is used for the reception of closing or opening DwPTS is set, and Figure 3 shows that TA CE message structure figure, and wherein R is reservation bit; Timing Advance Command (TA order) is used to indicate T _A(0,1,2...63) index value.For example can utilize R to carry and close or open indication, it is that the DwPTS reception is closed in 1 expression that R for example is set, and equals 0 expression and opens the DwPTS reception, and UE carries out work according to setting, until receive new setting.

Perhaps, the bit (with reference to 36.321) that first reservation of first byte in the RAR message is set is used for the reception of closing or opening DwPTS is set, and Figure 4 shows that RAR message structure figure, and wherein R is reservation bit; Timing Advance Command (TA order) is used to indicate T _A(0,1,2...1282) index value; UL Grant (up license domain) is used to indicate ascending resource; Temporary C-RNTI (interim Cell Radio Network Temporary Identifier/Identity, Cell-RNTI territory) is used to indicate the temporary mark that UE uses in the random access procedure.It is that the DwPTS reception is closed in 1 expression that R for example is set, and equals 0 expression and opens the DwPTS reception, and UE carries out work according to setting, until receive new setting.

Except RAR message and TA message are set, can also define a new MAC Control Element message and carry and be used to indicate the descending indication that UE closed or opened the reception of DwPTS.As shown in Figure 5, wherein the D bit is indicated closing or opening of DwPTS reception.

Embodiment 2

Present embodiment is described terminal and how to be received DwPTS, as shown in Figure 6, may further comprise the steps:

Step 210 receives the message of carrying the TA value;

Preferably, before receiving above-mentioned message, also receive the processing indication of broadcast transmission, this processing indication is used for the indication of closing that the notice current area is supported DwPTS.When network and terminal all give tacit consent to support DwPTS close indication the time, this step can be omitted.

Step 220 if judging to carry in the message closes indication, is then closed the reception of DwPTS, carries out uplink synchronous according to described TA value, sends upstream data.

Open indication, the reception of then opening DwPTS if carry in the terminal judges message.

Above-mentioned message comprises: RAR message or TA control unit message or newly-increased MAC Control Element message.

Embodiment 3

The present embodiment introduction realizes the network side apparatus of embodiment 1 method, as shown in Figure 7, comprising: judge module, sending module and module is set, wherein:

This judge module: be used for judging that whether the TA value of the message that sends to the TD-LTE terminal is greater than default maximum TA threshold value;

This sending module, the TA value that is used for judging the message that sends to the TD-LTE terminal at described judge module carry in this message and close indication during greater than default maximum TA threshold value, and this is closed to indicate and is used to indicate the reception that the TD-LTE terminal is closed DwPTS;

This arranges module, is used for after indication is closed in the sending module transmission, and network side is not used for this terminal in this DwPTS scheduling Physical Downlink Shared Channel is set.

Preferably, above-mentioned sending module also is used for: when judge module judges that the TA value of the message that sends to the TD-LTE terminal is not more than default maximum TA threshold value, carry in this message and open indication, this unlatching indication is used to indicate the reception that the TD-LTE terminal is opened DwPTS.Exist with network equipment if said apparatus is independent, then can send notice to network equipment, informed that it can be used in the DwPTS scheduling PDSCH of this terminal.

Preferably, this sending module also is used for: process indication to TD-LTE terminal broadcast transmission, be used for the indication of closing that notice TD-LTE terminal current area is supported DwPTS.

Embodiment 4

The present embodiment introduction realizes the terminal of embodiment 2 methods, as shown in Figure 8, comprising: receiver module, judge module and control module, wherein:

This receiver module is used for receiving the message of carrying the TA value;

This judge module is closed indication for judging whether message carries;

This control module is used for judging that at described judge module message carries when closing indication, closes the reception of DwPTS, carries out uplink synchronous according to described TA value, the transmission upstream data.

Preferably, this judge module also can be used for judging whether carry the unlatching indication in the message; This control module also is used for when judge module judges that message is carried the unlatching indication, the reception of opening DwPTS.

Preferably, this receiver module also is used for receiving the processing indication of broadcast transmission, and this processing indication is used for the indication of closing that the notice current area is supported DwPTS.

Use example 1

The below illustrates how to indicate TD-LTE UE to receive DwPTS take the base station as network side apparatus as example, in this example, the base station is in by the indication of RAR message and connects the UE reception of setting up attitude or do not receive DwPTS.As shown in Figure 9, may further comprise the steps:

Step 1, UE indicates according to the DwPTS relevant treatment in the cell broadcast information and judges whether this residential quarter supports the indicating downlink pilot time slot to receive, if the residential quarter supports the indicating downlink pilot time slot to receive, then UE thinks that the related bits or the message that receive about DwPts in the following steps are effective; If the residential quarter does not support the indicating downlink pilot time slot to receive or do not comprise the content that the indicating downlink pilot time slot receives in the system information of broadcasting, then UE thinks that the related bits or the message that receive about DwPts in the following steps are invalid;

Preferably, this processing indication can be to increase by one to be used to indicate the IE whether this residential quarter supports that the indicating downlink pilot time slot receives in SIB1 or SIB2.

Consider the compatibility of realization, by whether possessing this descending deixis in system message indicating current area, thereby avoid occurring because the version difference causes UE and network the situation that relevant field is understood differently and causes to occur.

The residential quarter initiating random access procedure that step 2:UE is being stationed;

The main purpose of random access procedure may be: RRC connects the request of foundation; The request of RRC connection reconstruction; Support the handoff procedure between the eNodeB; Obtain or recover uplink synchronous; PDCCH ORDER triggering etc.

Step 3: the base station receives the lead code (preamble) that UE sends, judge the distance of UE and base station, generate the TA value in RAR (accidental access response) message, simultaneously use this TA value whether can cause the up transmission of UE to exceed GP in conjunction with special subframe configuration determination UE, if not can the DwPTS that closes that arranges among the RAR is received as 0, the corresponding PDSCH of normal consistency DwPTS simultaneously; If the DwPTS that closes that can exceed GP then arrange among the RAR is received as 1, do not dispatch the corresponding PDSCH of DwPTS simultaneously, particularly, do not dispatch the PDSCH for this terminal;

The base station can judge UE uses this TA value whether can cause the up transmission of UE to exceed GP according to art methods.Owing to defined the length of GP, UpPts and DwPts under the different sub-frame configuration in the standard, so the base station is when sending by calculating the TA order that can judge according to appointment, UE send UpPtS whether can with receive DwPTS and conflict mutually.

Step 4:UE receives RAR, processes the reception of DwPTS according to the indication of whether closing in advance DwPTS, then sends Msg3;

Access procedure is finished in step 5:UE and base station collaborative work, enters connected state.

Use example 2

The below illustrates how to indicate TD-LTE UE to receive DwPTS take the base station as network side apparatus as example, in this example, the base station receives or do not receive DwPTS by the UE that the indication of TA message is in connected state.As shown in figure 10, may further comprise the steps:

Step 1: in connected state, the TA measurement is carried out according to upstream data or the upward signal that UE sends in the base station, generate TA and adjust instruction, whether the base station uses this TA value can cause the up transmission of UE to exceed GP in conjunction with special subframe configuration determination UE simultaneously according to TA value wherein, if not can the DwPTS that closes that arranges among the RAR is received as 0, the corresponding PDSCH of normal consistency DwPTS simultaneously; If the DwPTS that closes that can exceed GP then arrange among the RAR is received as 1, do not dispatch the corresponding PDSCH of DwPTS simultaneously, particularly, do not dispatch the PDSCH for this terminal;

When network side need to carry the TA message of descending indication to the terminal transmission, can process indication to the terminal broadcast transmission first, the notification terminal current area is supported descending indication (comprising the unlatching indication of closing indication or DwPTS of DwPTS).

Step 2: the user receives TA and adjusts order, processes the reception of DwPTS according to the indication of whether closing in advance DwPTS, then adjusts uplink synchronous and distributes transmission upstream data or upward signal according to corresponding resource according to TA value wherein;

Idle state is returned in the transmitting-receiving of step 3:UE end data, perhaps resends preamble and carries out access procedure.

One of ordinary skill in the art will appreciate that all or part of step in the said method can come the instruction related hardware to finish by program, described program can be stored in the computer-readable recording medium, such as read-only memory, disk or CD etc.Alternatively, all or part of step of above-described embodiment also can realize with one or more integrated circuits.Correspondingly, each the module/unit in above-described embodiment can adopt the form of hardware to realize, also can adopt the form of software function module to realize.The present invention is not restricted to the combination of the hardware and software of any particular form.

Certainly; the present invention also can have other various embodiments; in the situation that does not deviate from spirit of the present invention and essence thereof; those of ordinary skill in the art work as can make according to the present invention various corresponding changes and distortion, but these corresponding changes and distortion all should belong to the protection range of the appended claim of the present invention.

Claims

1. method of indicating the TD-LTE terminal to receive descending pilot frequency time slot comprises:

2. the method for claim 1 is characterized in that:

Described method also comprises: be not more than default maximum TA threshold value if judge the TA value in the message that sends to the TD-LTE terminal, then carry in this message and open indication, this unlatching indication is used to indicate the reception that the TD-LTE terminal is opened DwPTS.

3. the method for claim 1 is characterized in that,

Before judging, described method also comprises: process indication to TD-LTE terminal broadcast transmission, be used for the indication of closing that notice TD-LTE terminal current area is supported DwPTS.

4. such as claim 1 or 2 or 3 described methods, it is characterized in that:

Described default maximum TA threshold value is: guarantee time that the TD-LTE terminal sends uplink pilot time slot (UpPTS) not can with the TA value of the time-interleaving that receives DwPTS.

5. such as claim 1 or 2 or 3 described methods, it is characterized in that:

Described message comprises: accidental access response (RAR) message or TA control unit message or newly-increased MAC Control Element message.

6. a TD-LTE terminal receives the indicating means of descending pilot frequency time slot, comprising:

The message of timing advance (TA) value is carried in reception, if judging to carry in the message closes indication, then closes the reception of descending pilot frequency time slot (DwPTS), carries out uplink synchronous according to described TA value, sends upstream data.

7. method as claimed in claim 6 is characterized in that:

Described method also comprises: open indication, the reception of then opening DwPTS if judge to carry in the message.

8. method as claimed in claim 6 is characterized in that:

Before judging, described method also comprises: receive the processing indication of broadcast transmission, this processing indication is used for the indication of closing that the notice current area is supported DwPTS.

9. such as claim 6 or 7 or 8 described methods, it is characterized in that:

10. a device of indicating the TD-LTE terminal to receive descending pilot frequency time slot comprises judge module, sending module and module is set, wherein:

Described judge module: be used for judging that whether timing advance (TA) value of the message that sends to the TD-LTE terminal is greater than default maximum TA threshold value;

Described sending module, the TA value that is used for judging the message that sends to the TD-LTE terminal at described judge module is during greater than the maximum TA threshold value preset, carry in this message and close indication, this is closed indication and is used to indicate the reception that the TD-LTE terminal is closed descending pilot frequency time slot (DwPTS);

11. device as claimed in claim 10 is characterized in that:

Described sending module also is used for: when described judge module judges that the TA value of the message that sends to the TD-LTE terminal is not more than default maximum TA threshold value, carry in this message and open indication, this unlatching indication is used to indicate the reception that the TD-LTE terminal is opened DwPTS.

12. device as claimed in claim 10 is characterized in that:

Described sending module also is used for: process indication to TD-LTE terminal broadcast transmission, be used for the indication of closing that notice TD-LTE terminal current area is supported DwPTS.

13. such as claim 9 or 10 or 11 described devices, it is characterized in that:

14. such as claim 10 or 11 or 12 described devices, it is characterized in that:

15. a TD-LTE terminal that receives descending pilot frequency time slot comprises receiver module, judge module and control module, wherein:

Described receiver module is used for receiving the message of carrying timing advance (TA) value;

Described control module is used for judging that at described judge module message carries when closing indication, closes the reception of descending pilot frequency time slot (DwPTS), carries out uplink synchronous according to described TA value, the transmission upstream data.

16. terminal as claimed in claim 15 is characterized in that:

Described judge module is used for also judging whether message carries the unlatching indication;

Described control module also is used for when described judge module judges that message is carried the unlatching indication reception of opening descending pilot frequency time slot (DwPTS).

17. terminal as claimed in claim 15 is characterized in that:

Described receiver module also is used for receiving the processing indication of broadcast transmission, and this processing indication is used for the indication of closing that the notice current area is supported DwPTS.

18. such as claim 14 or 15 or 16 described terminals, it is characterized in that: