CN101159526A - Data transmission method - Google Patents
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- CN101159526A CN101159526A CNA2007101658013A CN200710165801A CN101159526A CN 101159526 A CN101159526 A CN 101159526A CN A2007101658013 A CNA2007101658013 A CN A2007101658013A CN 200710165801 A CN200710165801 A CN 200710165801A CN 101159526 A CN101159526 A CN 101159526A
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Abstract
The invention provides a data transmission method used in a time division duplexing system. The method comprises: step 1, a data transmission terminal packages the data in a predetermined frame structure and sends the data to a data reception terminal, in the predetermined frame structure, the random access channel is provided inside the uplink transmission subframe; step 2, the data reception terminal analyzes and processes the data packaged in the predetermined frame structure.
Description
Technical field
The present invention relates to moving communicating field, particularly a kind of data transmission method of TDD system.
Background technology
LTE (Long Term Evolution, Long Term Evolution) system definition two class frame structures, the second class frame structure wherein corresponding to the Long Term Evolution of TD-SCDMA, adopts TDD (Time Division Duplex) pattern.As shown in Figure 1, in the second class frame structure, subframe (subframe) 0 fixedly descends line data; N subframe is used to catch line data before among the subframe 1-6, and a back 6-n subframe is used to descend line data (1≤n≤6); (the Downlink Pilot Time Slot of DwPTS in the special time slot; descending special time slot) be used to transmit down-going synchronous information, GP (Guard Period, protection period) is a boundary belt; UpPTS (UplinkPilot Time Slot, uplink special time slot) is used to transmit uplink synchronous information.Simultaneously, in order to support big sub-district, preceding m subframe of 1-6 work song frame also can be used for catching capable synchronizing information, and the preceding n in the at this moment remaining upstream data subframe is used for catching line data, and back 6-m-n is individual to be used to descend line data.
The benefit of the second class frame structure of LTE system is to make LTE system and TD-SCDMA system realize adjacent frequency coexistence easily at present, as long as the uplink and downlink timeslot switching proportion that promptly makes the LTE system is identical with the TD-SCDMA system, just can avoid two phase mutual interference between the system effectively.But the shortcoming of this frame structure also is clearly, that is:
1.GP be provided with very dumb.In this system, the GP slot length equals 50us, and when system need support wider covering, the length of GP must enlarge, and the method that enlarges GP can be that reservation UpPTS time slot is the GP time slot, and perhaps reserving UpPTS time slot and TS1 is the GP time slot.Note, the part symbol that cannot reserve TS1 is GP, this is because the both sides of the common system bandwidth of ascending control channel, duration is a time slot, if reserving the part symbol of TS1 is GP, the receptivity of ascending control channel can seriously descend, the part symbol that also cannot reserve TS0 is GP, this be because the P/S-SCH signal TS0 latter two symbol send, if reserving the part symbol of TS0 is GP, the user just possibly can't receive the P/S-SCH signal, and the P/S-SCH signal signal that to be subscriber access system at first need receives, the user can't correctly receive the P/S-SCH signal, also just can't insert this system.
2.P/S-SCH signal is positioned at the boundary that descending time slot switches to ascending time slot; as preceding; the P/S-SCH signal is that subscriber access system at first needs the signal that receives; therefore; the power of P/S-SCH signal usually can be greater than other signal; under cellular environment,, can have a strong impact on the receptivity of ascending time slot signal because the power of P/S-SCH signal is bigger.
3.DwPTS the utilization ratio of time slot is not high, when the bandwidth ratio broad of system, owing to have only of middle bandwidth (1.25MHz) transmission of P-SCH signal in system bandwidth, so the utilization ratio of DwPTS time slot can be very low.
In order to address the above problem, some companies have proposed a new frame structure that is applicable to LTE system TDD model (, below this frame structure being called " new frame structure " in order to narrate conveniently).In this " new frame structure ", as shown in Figure 2, the radio frames of one 1 0ms is divided into two fields, and it is 0.5ms time slot (numbering from 0 to 9) that each field is divided into 10 length, two time slots are formed the subframe that length is 1ms, comprise 5 subframes (numbering from 0 to 4) in the field.For length is the short CP (CyclicPrefix, Cyclic Prefix) of 5.21us and 4.69us, the symbol that it is 66.7us that time slot comprises 7 length, and wherein first symbol CP length is 5.21us, the CP length of all the other 6 symbols is 4.69us; For length is the long CP of 16.67us, and a time slot comprises 6 symbols.In addition, in this frame structure, the preparation characteristics of subframe are:
Subframe 1 (hereinafter referred to as special subframe) comprises 3 special time slots, is respectively DwPTS, GP and UpPTS, wherein:
DwPTS is used for descending, and a minimum symbol is used to transmit primary synchronization channel P-SCH (Primary-Synchronization Channel), and when DwPTS comprised a plurality of symbol, P-SCH was placed on first symbol;
GP is a guard time, does not transmit any data;
UpPTS is used for up, comprises 2 symbols at least and is used to transmit RACH (RandomAccess Channel, Random Access Channel), and the symbolic number that comprises as UpPTS is greater than 2 the time, and RACH is placed on preceding two symbols and transmits;
Preceding n subframe of subframe 1 back is used for uplink, and a back 3-n subframe is used for downlink transfer, wherein 1≤n≤3.
In " new frame structure ", the RACH channel that is placed in the UpPTS can only use 2 symbols, and its length leading and GT (Guard Time) is shorter, and preamble length is 133.3us, GT length is 9.5us when CP (short) or 33.5us when CP (long), can not satisfy the requirement of big covering.If in order to support big covering, on current RACH channel basis, design a kind of more RACH channel of long preambles and GT that has again, then the complexity of terminal will increase greatly.
Summary of the invention
At above one or more problems, the invention provides a kind of data transmission method, by the RACH channel is placed in the subframe that is used for uplink, make the RACH channel have long leading and GT, can satisfy the requirement of big covering.
Data transmission method of the present invention is used for tdd systems, this method may further comprise the steps: step 1, data sending terminal becomes the predetermined frame structure to be sent to data receiver data encapsulation, and in the predetermined frame structure, Random Access Channel is arranged in the subframe that is used for uplink; And step 2, data receiver is resolved and is handled the data that are packaged into the predetermined frame structure.
The predetermined frame structure comprises: subframe 0 is fixed for transmitting downlink data; Subframe 1 comprises: descending special time slot, protection period, uplink special time slot; Preceding n subframe of subframe 1 back is used for uplink, wherein 1≤n≤3; And 3-n the subframe in back, be used for downlink transfer, wherein 1≤n≤3.
Wherein, when the subframe that is used for uplink was 2, Random Access Channel was arranged in 1 subframe at least.When the subframe that is used for uplink was 3, Random Access Channel was arranged in 1 subframe at least.When the subframe that is used for uplink was 3, Random Access Channel was arranged in 2 subframes, and 2 subframes are continuous subframe.Random Access Channel is not arranged in the uplink special time slot of subframe 1.
Random Access Channel comprise following one of at least: Cyclic Prefix, leading and guard time.
Method of the present invention is placed on Random Access Channel in 1 or several sub-frame of uplink can guarantee that Random Access Channel has enough length, supports bigger covering.In addition, there are the implementation method of identical Random Access Channel in the design TDD system that can guarantee LTE and FDD system like this, reduce the complexity and the cost of design.
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 is the LTE system second class frame structure schematic diagram in the prior art;
Fig. 2 is a kind of improved frame structure schematic diagram in the prior art;
Fig. 3 is the flow chart of steps of data transmission method according to an embodiment of the invention;
Fig. 4 is first kind of frame structure schematic diagram according to an embodiment of the invention;
Fig. 5 a is second kind of frame structure schematic diagram according to an embodiment of the invention;
Fig. 5 b is the third frame structure schematic diagram according to an embodiment of the invention;
Fig. 5 c is the 4th kind of frame structure schematic diagram according to an embodiment of the invention; And
Fig. 6 is the 5th kind of frame structure schematic diagram according to an embodiment of the invention;
Embodiment
Below with reference to accompanying drawing, describe the specific embodiment of the present invention in detail.
The invention provides a kind of data transmission method, be used for tdd systems, as shown in Figure 1, this method may further comprise the steps:
Step S302, data sending terminal becomes the predetermined frame structure to be sent to data receiver data encapsulation, and in the predetermined frame structure, Random Access Channel is arranged in the subframe that is used for uplink.
Step S304, data receiver is resolved and is handled the data that are packaged into the predetermined frame structure.
Wherein, Random Access Channel (RACH channel) comprises leading CP (Cyclic Prefix), leading and GT (guard time).
The predetermined frame structure is: subframe 0 is fixed for transmitting downlink data; Subframe 1 (special subframe) comprising: descending special time slot, protection period, uplink special time slot; Preceding n subframe of subframe 1 back is used for uplink, wherein 1≤n≤3; And 3-n the subframe in back, be used for downlink transfer, wherein 1≤n≤3.
According to the difference of the quantity of the subframe that is used for uplink in the predetermined frame structure, the method for placing the RACH channel is also different.The subframe that is used for uplink can be 1,2 or 3.
When the subframe that is used for uplink has only 1, the RACH channel is arranged in this subframe.As shown in Figure 4, subframe 2 is used for uplink in the predetermined frame structure, and subframe 3 and subframe 4 are used for downlink transfer.The RACH channel is arranged in the subframe 2 that is used for uplink, and wherein, the length of leading CP is 102.6us, and leading length is 800us, and the length of GT is 97.4us.
When the subframe that is used for uplink had 2, the RACH channel can be arranged in any 1 subframe or be arranged in 2 continuous subframes.Subframe 2 and subframe 3 are used for uplink in the predetermined frame structure, and subframe 4 is used for downlink transfer.The RACH channel can be arranged in the subframe 2, shown in Fig. 5 a, or is arranged in the subframe 3, and shown in Fig. 5 b, wherein, the length of the CP of RACH channel leading is 102.6us, and leading length is 800us, and the length of GT is 97.4us.The RACH channel also can be arranged in subframe 2 and 3, and shown in Fig. 5 c, wherein, the CP length of RACH channel leading is 684us, and preamble length is 800us, and GT length is 516us.The concrete situation that is provided with is according to environment for use and condition and different.
When the subframe that is used for uplink was 3, Random Access Channel can be arranged in wherein any 1 subframe, also can be arranged in wherein any 2 continuous subframes, can also be arranged in whole 3 uplink subframes.As shown in Figure 6, subframe 2, subframe 3 and subframe 4 are used for uplink in the predetermined frame structure, the RACH channel is arranged in subframe 2, subframe 3 and the subframe 4 that is used for uplink, wherein, the CP length of RACH channel leading is 684us, preamble length is 1600us (with the leading repetition of 800us 2 times), and GT length is 716us.
It is noted that when the above-mentioned RACH of setting channel, the RACH channel can not be arranged in the uplink special time slot of subframe 1.
After being arranged on the RACH channel in the predetermined frame structure, data sending terminal sends to data receiver with predetermined frame, finishes the transmission of RACH channel.Method of the present invention can be used for the situation of tdd systems and TD-SCDMA coexistence of systems.
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 (7)
1. a data transmission method is used for tdd systems, it is characterized in that, said method comprising the steps of:
Step 1, data sending terminal becomes the predetermined frame structure to be sent to data receiver data encapsulation, and in described predetermined frame structure, Random Access Channel is arranged in the subframe that is used for uplink; And
Step 2, described data receiver is resolved and is handled the data that are packaged into described predetermined frame structure.
2. data transmission method according to claim 1 is characterized in that, described predetermined frame structure comprises:
Subframe 0 is fixed for downlink transfer;
Subframe 1 comprises: descending special time slot, protection period, uplink special time slot;
Preceding n subframe of subframe 1 back is used for uplink, wherein 1≤n≤3;
And
A back 3-n subframe is used for downlink transfer, wherein 1≤n≤3.
3. data transmission method according to claim 2 is characterized in that, in described step 1, when the subframe that is used for uplink was 2, described Random Access Channel was arranged in 1 subframe at least.
4. data transmission method according to claim 2, it is characterized in that, in described step 1, when the subframe that is used for uplink is 3, described Random Access Channel is arranged in 1 subframe (when Random Access Channel was placed in the subframe more than 1, the subframe of placing Random Access Channel was a continuous subframes) at least.
5. data transmission method according to claim 4 is characterized in that, in described step 1, when the subframe that is used for uplink was 3, described Random Access Channel was arranged in 2 subframes or 3 subframes, and described 2 subframes are continuous subframe.
6. according to each described data transmission method in the claim 1 to 5, it is characterized in that described Random Access Channel is not arranged in the uplink special time slot of described subframe 1.
7. according to each described data transmission method in the claim 1 to 5, it is characterized in that described Random Access Channel comprises with the lower part: Cyclic Prefix, leading and guard time, wherein the length of Cyclic Prefix can be 0.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN200710165801.3A CN101159526B (en) | 2007-10-29 | 2007-10-29 | Data transmission method |
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| CN200710165801.3A CN101159526B (en) | 2007-10-29 | 2007-10-29 | Data transmission method |
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| CN101159526A true CN101159526A (en) | 2008-04-09 |
| CN101159526B CN101159526B (en) | 2014-03-19 |
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| CN200710165801.3A Active CN101159526B (en) | 2007-10-29 | 2007-10-29 | Data transmission method |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101662827A (en) * | 2008-08-25 | 2010-03-03 | 三星电子株式会社 | Method for specifying protective work time slot to reduce inter-system interference |
| CN101742698B (en) * | 2008-11-10 | 2012-10-17 | 华为技术有限公司 | Indication and acquisition method, device and system of CP length configuration |
| CN102932327A (en) * | 2012-07-17 | 2013-02-13 | 上海金图信息科技有限公司 | Method and system for communicating zero-terminal equipment and desktop virtual machine |
| CN103078718A (en) * | 2008-10-24 | 2013-05-01 | 华为技术有限公司 | Relay transmission method and device |
| US9203501B2 (en) | 2008-10-24 | 2015-12-01 | Huawei Technologies Co., Ltd. | Relay transmission method and apparatus |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0938193A1 (en) * | 1998-02-18 | 1999-08-25 | Sony International (Europe) GmbH | Header structure for TDD systems |
| CN100375561C (en) * | 2004-09-13 | 2008-03-12 | 大唐移动通信设备有限公司 | Method for distributing radio resource in multiple carrier time-division duplex mobile communication system |
| CN101043256B (en) * | 2006-03-23 | 2013-03-27 | 电信科学技术研究院 | User access method for TDD mode |
| CN101197608A (en) * | 2006-12-04 | 2008-06-11 | 华为技术有限公司 | Communication method and device in TDD mode |
| CN101369840B (en) * | 2007-08-13 | 2012-07-04 | 电信科学技术研究院 | TDD accidental access method, system and its composition modules |
-
2007
- 2007-10-29 CN CN200710165801.3A patent/CN101159526B/en active Active
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101662827A (en) * | 2008-08-25 | 2010-03-03 | 三星电子株式会社 | Method for specifying protective work time slot to reduce inter-system interference |
| CN103078718A (en) * | 2008-10-24 | 2013-05-01 | 华为技术有限公司 | Relay transmission method and device |
| CN103078718B (en) * | 2008-10-24 | 2015-08-19 | 华为技术有限公司 | The method and apparatus of relay transmission |
| US9203501B2 (en) | 2008-10-24 | 2015-12-01 | Huawei Technologies Co., Ltd. | Relay transmission method and apparatus |
| CN101742698B (en) * | 2008-11-10 | 2012-10-17 | 华为技术有限公司 | Indication and acquisition method, device and system of CP length configuration |
| CN102932327A (en) * | 2012-07-17 | 2013-02-13 | 上海金图信息科技有限公司 | Method and system for communicating zero-terminal equipment and desktop virtual machine |
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| CN101159526B (en) | 2014-03-19 |
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