CN101162981B - Frame structure generating method of TDD communication system - Google Patents

Frame structure generating method of TDD communication system Download PDF

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Publication number
CN101162981B
CN101162981B CN2006101401828A CN200610140182A CN101162981B CN 101162981 B CN101162981 B CN 101162981B CN 2006101401828 A CN2006101401828 A CN 2006101401828A CN 200610140182 A CN200610140182 A CN 200610140182A CN 101162981 B CN101162981 B CN 101162981B
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time slot
frame
ascending
time
slot
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CN2006101401828A
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Chinese (zh)
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CN101162981A (en
Inventor
刁心玺
肖炼斌
陈冠
马志锋
耿鹏
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中兴通讯股份有限公司
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Abstract

The invention discloses a generation method of a frame structure applied in a time division duplex communication system. The generation method of the frame structure comprises: a first timeslot is arranged as a downlink timeslot for sending system broadcast information and then a downlink pilot timeslot and a guard interval are arranged. One or multiple unlink timeslots are arranged following the guard interval and an uplink pilot timeslot is arranged behind of one of the unlink timeslots. One or multiple downlink timeslots are arranged behind one or multiple uplink timeslots and the uplink pilot timeslot. The invention eliminates the interference of the downlink signal sent by the downlink pilot timeslot to the uplink pilot timeslot theoretically, which is easy to be carried out. In addition, implementation needs little change.

Description

The frame structure generating method of tdd communication systems

Technical field

The present invention relates to wireless communication field, relate in particular to the frame structure and the time slot allocation of tdd communication systems.

Background technology

In end of the year to 1,999 1998 year, according to ITU (InternationalTelecommunications Union, International Telecommunications Union) suggestion of discussing in, TD-SCDMA (Time Division-Synchronization Code Division MultipleAccess, the TD SDMA access) system has made repeatedly its frame structure and has revised, form present frame structure form, see Fig. 1.

The physical channel of present TD-SCDMA adopts four-layer structure: system-frame (superframe), radio frames, subframe and time slot/sign indicating number.Time slot is used for distinguishing the different user signal on time domain, has the characteristic of TDMA (Time Division Multiple Access, time division multiple access).Each is wireless frame length 10ms (above and UTRA (access of UMTS terrestrial wireless) TDD (Time division duplex, time division duplex) is identical).The support to technology such as smart antenna and uplink synchronous has been considered in the design of TD-SCDMA system frame structure.A tdma frame (radio frames) 101 long 10ms are divided into two 5ms subframe 102a, 102b that structure is identical.Each subframe has two transfer points.Number by the flexible configuration uplink and downlink timeslot is applicable to the non-symmetrical service pattern.3 special time slot DwPTS (Down link Pilot Time Slot, descending pilot frequency time slot), GP (Guard Period, protection at interval) and UpPTS (Up link Pilot Time Slot, uplink pilot time slot) are arranged in the subframe.DwPTS is as descending pilot frequency and design synchronously, and UpPTS designs for uplink synchronous, GP be in Node B (base station) side by emission to receiving the protection interval of changing.CP indication code leaf length in the main time slot burst structure, burst is made up of two data blocks, an intermediate code and a GP.

Conventional time slot is used for transmitting user data or control information, and TS0 always comes the transmitting system broadcast message as descending time slot regularly, and TS1 is always regularly as ascending time slot.Other conventional time slot can be configured to upstream or downstream as required neatly to realize the transmission of asymmetric traffic, as transmission of packet data.The 1st transfer point is fixed on TS0 end, and the 2nd transfer point then depends on the configuration (see figure 1) of sub-district uplink and downlink time slot.

Three special time slots, the arrangement of DwPTS, GP and UpPTS is a significantly difference of the frame structure of TD-SCDMA frame structure and other system, particularly process GP arrangement of time UpPTS time slot is characteristics of TD-SCDMA standard after descending DwPTS, and the outfield practice shows that there is major defect in the mode of this arrangement UpPTS.

Fig. 2 is that TD-SCDMA base station down synchronizing signal may be at the interference curve schematic diagram of UpPTS generation.The downstream signal that the base station sends at the DwPTS time slot can be because the influence of environment produces very big time delay expansion 103, this time delay spread signal is that direct path or the stack of reflection path on the home base stations antenna are passed through at the signal of DwPTS time slot emission in a plurality of adjacent base stations or non-adjacent base station, this is superimposed upon the interference magnitude 104 that can produce in the UpPTS time slot considerably beyond detection threshold, cause the base station can't sense terminals the normal upward signal of emission, make terminal can't finish normal access procedure.

In order to solve downstream signal that the DwPTS time slot the sends interference problem to the UpPTS time slot, following method is arranged: 1) length of compression DwPTS increases the length of GP, only launches the first half of DwPTS; 2) parity frame is alternately launched DwPTS, allows the UpPTS time slot of terminal in the subframe of not launching DwPTS send uplink synchronizing signals; 3) a plurality of subframes are one group of loop cycle emission DwPTS; 4) interference cancellation; 5) N frequency integrated dispatch; 6) ascending time slot in the TD-SCDMA frame and descending time slot are exchanged.

Said method 1)~5 all be to alleviate the interference of DwPTS to a certain extent), and all be that other performances with sacrificial system are cost the UpPTS time slot, as, sacrifice the down-going synchronous performance, sacrifice the access speed of terminal etc.Method 6) if exchange simply, the downstream signal that the DwPTS time slot sends shows no sign of solution to the interference problem of UpPTS time slot.

In addition, the proposition of existing method all is that thinking is confined to solve on the interference problem of downstream signal to the UpPTS time slot of DwPTS time slot transmission, does not consider that the TD-SCDMA system introduces the requirement that wireless digital repeater is arranged the UpPTS time slot.

Therefore, need a kind of technical scheme, uplink synchronizing signals or the up access signal that the realization terminal can be issued the base station are not disturbed.

Summary of the invention

Main purpose of the present invention is to provide a kind of production method and business time-slot distribution method that is used for the frame structure of tdd communication systems, is used to overcome downstream signal that DwPTS time slot that limitation and defective owing to prior art cause the sends interference problem to the UpPTS time slot.

To achieve these goals, according to a first aspect of the invention, the invention provides a kind of production method that is used for the frame structure of tdd communication systems.Frame structure generating method may further comprise the steps:

Step S102 is provided with first time slot, as descending time slot, is used for the transmitting system broadcast message;

Step S104, and then first time slot is provided with descending pilot frequency time slot and protection at interval;

Step S106, and then protection is provided with one or more ascending time slots, and uplink pilot time slot is set to one of them ascending time slot back at interval;

Step S108 after one or more ascending time slots and uplink pilot time slot, is provided with one or more descending time slots.

Alternatively, uplink pilot time slot is arranged on first ascending time slot back in one or more ascending time slots.

Preferably, when ascending time slot during, uplink pilot time slot is arranged on second ascending time slot back in a plurality of ascending time slots more than one.

Alternatively, when ascending time slot during, uplink pilot time slot is arranged on the 3rd ascending time slot back in a plurality of ascending time slots more than two.

Frame structure can be used for the subframe of the radio frames of TD-SCDMA system.Total number of one or more ascending time slots and one or more descending time slots can be 6.

Protection can be set at interval between uplink pilot time slot and ascending time slot.

Uplink pilot time slot can comprise uplink synchronous time slot or up access slot.

To achieve these goals, according to a second aspect of the invention, the invention provides a kind of business time-slot distribution method that is used for tdd communication systems.Business time-slot distribution method adopts according to the frame structure that said method produced, and wherein, the ascending time slot that is being close to the uplink pilot time slot front is special ascending time slot, and other ascending time slots are common ascending time slot.Business time-slot distribution method may further comprise the steps:

Step S202 when the uplink service access takes place, judges whether common ascending time slot is enough, if enough, then inserts common ascending time slot, and business time-slot distributes end, if not enough, then proceeds to step S204;

Step S204 judges that whether uplink service is real time business, if real time business then proceeds to step S206, if not real time business, then proceeds to step S210;

Step S206 judges in the business in the common ascending time slot whether can adjust the capacity that can hold real time business from the non-real-time service of its service, if can, then proceed to step S208, if cannot, then proceed to step S210;

Step S208, judge whether special ascending time slot has the capacity of the business that admittance adjusts, if can admit, then from common ascending time slot, adjust non-real-time service to special ascending time slot, real time business is linked into common ascending time slot, and business time-slot distributes end, if can not admit, then refusal inserts, and business time-slot distributes end;

Step S210 judges whether special ascending time slot can hold uplink service, if can, then inserting special ascending time slot, business time-slot distributes end, if cannot, then refusal inserts, and the business time-slot distribution finishes.

In step S202, judging that common ascending time slot is whether enough can be by judging whether common ascending time slot has the idle capacity that holds uplink service and carry out.

By technique scheme, the present invention has eliminated the interference to the UpPTS time slot of downstream signal that the DwPTS time slot sends from principle, and is easy to implement, and the change that relates in the realization aspect seldom.

Description of drawings

Accompanying drawing described herein is used to provide further understanding of the present invention, constitutes the application's a part, and illustrative examples of the present invention and explanation thereof are used to explain the present invention, do not constitute improper qualification of the present invention.In the accompanying drawings:

Fig. 1 illustrates the frame structure of existing TD-SCDMA system;

Fig. 2 illustrates the interference that existing TD-SCDMA system frame structure causes;

Fig. 3 is the flow chart according to the production method of the frame structure of tdd communication systems of the present invention;

Fig. 4 is the flow chart according to the business time-slot distribution method of tdd communication systems of the present invention;

Fig. 5 illustrates the time division duplex frame structure according to the embodiment of the invention;

Fig. 6 illustrates the application example according to the time division duplex frame structure of the embodiment of the invention; And

Fig. 7 is the flow chart to the arrangement method of special ascending time slot according to the embodiment of the invention.

Embodiment

Describe the present invention below with reference to the accompanying drawings in detail.

Fig. 3 illustrates the production method that is used for the frame structure of tdd communication systems according to of the present invention.Frame structure generating method may further comprise the steps:

Step S102 is provided with first time slot, as descending time slot, is used for the transmitting system broadcast message.

Step S104, and then first time slot is provided with descending pilot frequency time slot and protection at interval.

Step S106, and then protection is provided with one or more ascending time slots, and uplink pilot time slot is set to one of them ascending time slot back at interval.

Uplink pilot time slot can be arranged on first ascending time slot back in one or more ascending time slots.When ascending time slot during, uplink pilot time slot can be arranged on second ascending time slot back in a plurality of ascending time slots more than one.When ascending time slot during, uplink pilot time slot can be arranged on the 3rd ascending time slot back in a plurality of ascending time slots more than two.Uplink pilot time slot can comprise uplink synchronous time slot or up access slot.Protection can be set at interval between uplink pilot time slot and ascending time slot.

Step S108 after one or more ascending time slots and uplink pilot time slot, is provided with one or more descending time slots (also descending time slot might be set).

Frame structure can be used for the subframe of the radio frames of TD-SCDMA system.Total number of one or more ascending time slots and one or more descending time slots can be 6.

Fig. 4 illustrates the business time-slot distribution method that is used for tdd communication systems according to of the present invention.Business time-slot distribution method adopts according to the frame structure that method shown in Figure 3 produced, and wherein, the ascending time slot that is being close to the uplink pilot time slot front is special ascending time slot, and other ascending time slots are common ascending time slot.Business time-slot distribution method may further comprise the steps:

Step S202, when the uplink service access takes place, by judging whether common ascending time slot has the idle capacity that holds uplink service and judge whether common ascending time slot is enough, if it is enough, then insert common ascending time slot, business time-slot distributes end, if not enough, then proceeds to step S204;

Step S204 judges that whether uplink service is real time business, if real time business then proceeds to step S206, if not real time business, then proceeds to step S210;

Step S206 judges in the business in the common ascending time slot whether can adjust the capacity that can hold real time business from the non-real-time service of its service, if can, then proceed to step S208, if cannot, then proceed to step S210;

Step S208, judge whether special ascending time slot has the capacity of the business that admittance adjusts, if can admit, then from common ascending time slot, adjust non-real-time service to special ascending time slot, real time business is linked into common ascending time slot, and business time-slot distributes end, if can not admit, then refusal inserts, and business time-slot distributes end;

Step S210 judges whether special ascending time slot can hold uplink service, if can, then inserting special ascending time slot, business time-slot distributes end, if cannot, then refusal inserts, and the business time-slot distribution finishes.

The present invention is intended to the downstream signal that solves the transmission of DwPTS time slot is taken all factors into consideration the interference problem and the professional real-time demand of UpPTS time slot, other characteristics in conjunction with the TD-SCDMA system, integrated use as intelligent antenna technology, fundamentally eliminate of the interference of the downstream signal of DwPTS time slot transmission to the UpPTS time slot, provide the UpPTS time slot arrangement of complex optimum, and the terseness of ensuring method, practicality.

In the frame structure that is applicable to tdd communication systems that the present invention provides, the uplink synchronizing signals time slot is followed in reverse link traffic channel time slot back, exists protection at interval between uplink synchronizing signals time slot and reverse link traffic channel time slot.

The frame structure of avoiding the TD-SCDMA system that uplink synchronous time slot (perhaps up access slot) disturbed according to the embodiment of the invention a kind of is described below.

In adjusted TD-SCDMA radio frames 201 to the UpPTS position, uplink synchronous time slot (perhaps up access slot) UpPTS time slot is put into the back of ascending time slot, multiple placement location can be arranged, be put into such as, UpPTS time slot that TS1 back, UpPTS time slot are put into the TS2 back, the UpPTS time slot is put into the TS3 back.But placement location is the back at TS2 preferably.

The benefit that UpPTS is put into the TS1 back is: 1) can terminal the SYNC-UL signal of UpPTS time slot emission to the Interference Control of adjacent base station in very little scope, because SYNC-UL is (Synchronization-Up link, uplink synchronous) GP of back has ensured that terminal only can produce interference to the outer base station of 32CHIP=7.5 kilometer, and the transmitting power of terminal has determined this to disturb and the signal of the terminal of interfered cell is little a lot, can not produce substantial effect, 2) there be not of the interference of SYNC-UL signal, because the time slot of back also is the terminal transmission time slot to other-end.

UpPTS be put into the TS3 back also can terminal the SYNC-UL signal of UpPTS time slot emission to the Interference Control of adjacent base station in very little scope, but, may be to (7.5 kilometers outer) terminal at a distance, produce a bit and disturb, in view of 7.5 kilometers the transmission range and the transmitting power of terminal, this interference is little more a lot of than the signal of base station that disturbed terminal receives.

Why say that it is a kind of method preferably that UpPTS is put into the TS2 back, reason is that this mode has two benefits: can obtain and UpPTS is put into same benefit after the TS1; Be convenient to DwPTS (R), GP (R) in the wireless repeater radio frames 204 and the arrangement (referring to Fig. 6) of UpPTS (R) 205.

The characteristics that adopt frame structure shown in Figure 5 are that original DwPTS is converted to the interference of DwPTS to TS1 to the interference of UpPTS time slot, and TS1 is a Traffic Channel, can resist, suppress this interference by measures such as chnnel coding, beam shapings, to such an extent as to even if disturbing under the invalid fully situation of very strong above-mentioned interference protection measure, its result who causes just allows the TS1 time slot free time, cause the waste of this time interval resource, the consequence that this terminal that causes compared with present frame structure can't insert wants " flexibility " a little.

Next, description is according to the business time-slot arrangement method of the embodiment of the invention.

The arrangement method of the terminal traffic time slot that the present invention provides is: preferentially use common ascending time slot to be used for the arrangement of miscellaneous service, when common ascending time slot is not enough, non-real-time service is arranged into the special ascending time slot the inside that is subjected to the downstream signal interference easily, real time business is arranged into common uplink service time slot the inside.

With reference to Fig. 7, the arrangement method of the terminal traffic time slot that the present invention provides is made up of following steps, described special ascending time slot is meant in UpPTS time slot front and is close to that business time-slot of UpPTS time slot, different according to the difference of UpPTS position and transfer point, this special ascending time slot can be any time slots among TS1~TS6 in the TD-SCDMA frame structure.

Step 301 inserts and waits for.New service access is waited in the access-in management unit of network, enters step 302 after service access is arranged.

Whether step 302 comprises uplink.Whether the business that the request of access-in management unit judges inserts comprises uplink service (whether needing the uplink time slot), if comprise uplink service, just enters step 303; If do not comprise uplink service, just enter step 312.

Step 303, whether common ascending time slot is enough.Judge whether common ascending time slot has the idle capacity that holds this uplink service,, just enter step 313 if having; If common ascending time slot does not hold the idle capacity of this uplink service, just enter step 304.

Step 304, whether up be real time business.According to the applying type of terminal, judge whether this business is real time business, if, just enter step 306, if not real time business, just enter step 305.

Step 305, whether special ascending time slot can hold this business.The access-in management unit judges according to the situation that takies and the demand of the business of asking to insert to capacity of special time slot whether special ascending time slot can hold this business.If can hold this business, just enter step 311; If can not hold the access of this business, just enter step 310.

Whether can from the non-real-time service of its service, adjust the capacity that can hold this real time business in the business in the step 306, common ascending time slot.If of course, just enter step 307, if cannot, just entering step 305, the purpose that enters step 305 is to handle according to non-real-time service.

Whether step 307, special ascending time slot have the capacity of these business that adjust of admittance.If special ascending time slot has the capacity of these business that adjust of admittance, just enter step 308; Otherwise, enter step 310.

Step 308 is adjusted non-real-time service to special ascending time slot from common ascending time slot.Purpose is for real time business adjusts resource needed, for the access of real time business is prepared.

Step 309 is linked into common ascending time slot to real-time uplink service.

Step 310, refusal inserts.

Step 311 inserts special ascending time slot.

Step 312 is user's allocation of downlink time slot according to common descending cut-in method.

Step 313 inserts common ascending time slot.

The present invention reaches following effect: 1) eliminated the interference of the downstream signal of DwPTS time slot transmission to the UpPTS time slot from principle; 2) frame structure has guaranteed that access signal between terminal and the wireless repeater is not subjected to the interference of adjacent base station transmit signals; 3) easy to implement, the change that relates in the realization aspect seldom, and these designs to change also be the adjustment of time relationship.

The above is the preferred embodiments of the present invention only, is not limited to the present invention, and for a person skilled in the art, the present invention can have various changes and variation.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. a production method that is used for the frame structure of tdd communication systems is characterized in that, may further comprise the steps:
Step S102 is provided with first time slot, as descending time slot, is used for the transmitting system broadcast message;
Step S104, and then described first time slot is provided with descending pilot frequency time slot and protection at interval;
Step S106, and then described protection is provided with one or more ascending time slots, and uplink pilot time slot is set to one of them ascending time slot back at interval;
Step S108 if described frame structure is not finished, then after described one or more ascending time slots and described uplink pilot time slot, is provided with one or more descending time slots.
2. the production method of frame structure according to claim 1 is characterized in that, described uplink pilot time slot is arranged on first ascending time slot back in described one or more ascending time slot.
3. the production method of frame structure according to claim 1 is characterized in that, when described ascending time slot during more than, described uplink pilot time slot is arranged on second ascending time slot back in described a plurality of ascending time slot.
4. the production method of frame structure according to claim 1 is characterized in that, when described ascending time slot during more than two, described uplink pilot time slot is arranged on the 3rd ascending time slot back in described a plurality of ascending time slot.
5. according to the production method of each described frame structure in the claim 1 to 4, it is characterized in that described frame structure is used for the subframe of the radio frames of TD-SCDMA system.
6. according to the production method of each described frame structure in the claim 1 to 4, it is characterized in that total number of described one or more ascending time slots and described one or more descending time slots is 6.
7. according to the production method of each described frame structure in the claim 1 to 4, it is characterized in that, protection is set at interval between described uplink pilot time slot and described ascending time slot.
8. according to the production method of each described frame structure in the claim 1 to 4, it is characterized in that described uplink pilot time slot comprises uplink synchronous time slot or up access slot.
CN2006101401828A 2006-10-12 2006-10-12 Frame structure generating method of TDD communication system CN101162981B (en)

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CN101645732A (en) * 2008-08-06 2010-02-10 华硕电脑股份有限公司 Signal forwarding device and signal forwarding method
WO2010102449A1 (en) * 2009-03-11 2010-09-16 华为技术有限公司 Coexistence method and device of multiple running main systems
CN102014394B (en) * 2009-09-08 2014-04-09 中兴通讯股份有限公司 Method and device for dynamically configuring uplink pilot channel
CN104052570B (en) * 2013-03-15 2017-08-18 华为技术有限公司 A kind of information transferring method and equipment based on time division duplex
CN104135359B (en) * 2014-07-22 2017-12-12 南京磐能电力科技股份有限公司 Tandem type multi-node synchronization sampling and data transmission method when a kind of strong
CN109039571A (en) * 2014-08-21 2018-12-18 上海朗帛通信技术有限公司 The transmission method and device of TDD system signal
CN105828363B (en) * 2016-03-30 2020-04-21 深圳科立讯通信有限公司 Method and device for aligning time slots of narrow-band wireless digital communication
EP3432497A4 (en) * 2016-06-07 2019-03-20 Guangdong OPPO Mobile Telecommunications Corp., Ltd. Data transmission method and device
CN106301738B (en) * 2016-06-28 2020-04-07 宇龙计算机通信科技(深圳)有限公司 Communication method based on frame structure
CN108882372A (en) * 2017-05-16 2018-11-23 大唐移动通信设备有限公司 A kind of method and apparatus of time slot allocation

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