CN101515848A - Frame structure and data transmission method for time division duplexing wireless communication system - Google Patents
Frame structure and data transmission method for time division duplexing wireless communication system Download PDFInfo
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- CN101515848A CN101515848A CNA2008100083278A CN200810008327A CN101515848A CN 101515848 A CN101515848 A CN 101515848A CN A2008100083278 A CNA2008100083278 A CN A2008100083278A CN 200810008327 A CN200810008327 A CN 200810008327A CN 101515848 A CN101515848 A CN 101515848A
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Abstract
The invention discloses a transmission method for a time division duplexing wireless communication system. The data transmission between a base station and a terminal is carried out by taking a super frame as a unit; within the duration of one super frame, the base station sends a predecessor to the terminal and transmits downlink data to the terminal through nine downlink physical frames; and the terminal transmits uplink data to the base station through 15 uplink physical frames. The invention also discloses a frame structure for the time division duplexing wireless communication system. The frame structure is the super frame which consists of one predecessor and twenty-four physical frames. The twenty-four physical frames are divided into the downlink physical frames and the uplink physical frames in the proportion of 3:5 of the downlink number to the uplink number. The technical proposal solves the problem of dividing the PHY frames into the downlink frames and uplink frames. The technical proposal simultaneously solves the problems of resource allocation, time delay, guard band, and the like.
Description
Technical field
The present invention relates to wireless communication system, relate in particular to the frame structure and the data transmission method of a kind of TDD (Time DivisionDuplex, time division duplex) wireless communication system.
Background technology
To be that unit carries out in the wireless system of transfer of data with superframe (superframe), the Uplink/Downlink of radio open transmission generally be that unit transmits data with superframe; Each superframe is made up of a preamble (leading) and several PHY Frame (physical frame); Preamble and PHY Frame form for base unit with OFDM (OrthogonalFrequency Division Multiplexing, OFDM) Symbol (symbol).
Present UMB (Ultra Mobile Broadband, super mobile broadband), LTE (Long-Term Evolution, Long Term Evolution), Wimax (WorldwideInteroperability for Microwave Access, micro-wave access to global intercommunication) all there are two kinds of duplex modes in system, be FDD (Frequency Division Duplex, Frequency Division Duplexing (FDD)) mode and TDD mode.
Under the FDD mode, Uplink/Downlink adopts different frequency band transmission, like this, and in the system/resource allocation of descending PHY Frames is relatively independent.
Under the TDD mode, Uplink/Downlink uses identical frequency range timesharing to transmit.System how PHY frames be set to be used for up/descending be a relatively more crucial problem, it also is attended by problems such as resource allocation, time delay and protection interval simultaneously needs solution.
Summary of the invention
The invention provides a kind of frame structure and data transmission method of TDD radio communication system, to solve on the PHY frames that prior art exists/problem that downlink resource is divided.
In order to solve the problems of the technologies described above, according to an aspect of the present invention, a kind of transmission method of TDD radio communication system is provided, wherein, base station and terminal are that unit carries out transfer of data with the superframe, and in the duration of a superframe, the base station sends one leading to terminal, and sending downlink data to terminal by 9 downstream physical frame, terminal sends upstream data by 15 ascending physical signal frames to the base station.
In said method of the present invention, in the duration of a superframe, the base station at first sends leading to terminal, provide overhead information to terminal.
In said method of the present invention, in the duration of a superframe, the base station successively sends downlink data by 3 downstream transmission blocks of being made up of 3 continuous downstream physical frame to terminal; Terminal successively sends upstream data by 3 uplink transmission blocks of being made up of 5 continuous ascending physical signal frames to the base station.
Further, in the duration of a superframe, the base station sends downlink data by the downstream transmission blocks that one or more downstream physical frame are formed to terminal earlier, terminal sends upstream data by the uplink transmission block that one or more ascending physical signal frames are formed to the base station again, so alternately send, the uplink and downlink data respectively send one or many in a superframe duration.
Further, in the duration of a superframe, after the base station sends downlink data and before the terminal transmission upstream data, and/or terminal sends after the upstream data and the base station sends before the downlink data, one time interval was all arranged, and base station and terminal all do not send data on this time interval.
A kind of transmission method of TDD radio communication system is provided according to another aspect of the present invention.
Wherein, base station and terminal are that unit carries out transfer of data with the superframe, in the duration of a superframe, the base station at first sends leading to terminal, the downstream transmission blocks of forming by 3 continuous downstream physical frame sends downlink data to terminal then, base station and terminal do not send data on very first time interval then, the base station receiving terminal is by the upstream data of the uplink transmission block transmission of 5 continuous ascending physical signal frames compositions then, base station and terminal do not send data on second time interval then, the base station sends downlink data by another downstream transmission blocks that 3 continuous downstream physical frame are formed to terminal more then, base station and terminal do not send data on the 3rd time interval then, the base station upstream data that sends of another uplink transmission block of forming by 5 continuous ascending physical signal frames of receiving terminal more then, base station and terminal do not send data on the 4th time interval then, the base station sends downlink data by another downstream transmission blocks that 3 continuous downstream physical frame are formed to terminal more then, base station and terminal do not send data on the 5th time interval then, then the base station upstream data that sends of another uplink transmission block of forming by 5 continuous ascending physical signal frames of receiving terminal again.
A kind of frame structure of TDD radio communication system is provided according to a further aspect in the invention.
Frame structure according to the embodiment of the invention is a superframe, superframe by one leading and 24 physical frames form, these 24 physical frames are that 3: 5 mode is divided into downstream physical frame and ascending physical signal frame according to descending and up number ratio.
In the frame structure according to the embodiment of the invention, the leading original position that is positioned at frame structure comprises overhead information.
In frame structure according to the embodiment of the invention, comprise 3 downstream transmission blocks of forming by 3 continuous downstream physical frame in the superframe, and 3 uplink transmission blocks of forming by 5 continuous ascending physical signal frames.
Further, in the superframe from original position, be provided with the downstream transmission blocks that one or more downstream physical frame are formed earlier, be provided with the uplink transmission block that one or more ascending physical signal frames are formed afterwards, comprise one or more groups alternatively distributed like this uplink transmission block and downstream transmission blocks in the superframe.
Further, between downstream transmission blocks and uplink transmission block, be inserted with the guardtime interval of certain hour length; The guardtime that between uplink transmission block and downstream transmission blocks subsequently, is inserted with certain time length at interval, this guardtime at interval with equate at interval at the guardtime that inserts between downstream transmission blocks and the uplink transmission block or unequal.
A kind of frame structure of TDD radio communication system also is provided according to a further aspect in the invention.
Frame structure according to the embodiment of the invention is a superframe, comprise successively that in superframe one is leading, 3 descending transmission blocks that continuous downstream physical frame is formed, very first time interval, 5 uplink transmission blocks that continuous ascending physical signal frame is formed, second time interval, 3 another downstream transmission blocks that continuous downstream physical frame is formed, the 3rd time interval, 5 another uplink transmission blocks that continuous ascending physical signal frame is formed, the 4th time interval, 3 another downstream transmission blocks that continuous downstream physical frame is formed, the 5th time interval and 5 another uplink transmission blocks that continuous ascending physical signal frame is formed.
The present invention program has solved the problem that PHY frames uplink and downlink are divided, and has also solved problems such as resource allocation, time delay and protection interval simultaneously.
Other features and advantages of the present invention will be set forth in the following description, and, partly from specification, become apparent, perhaps understand by implementing the present invention.Purpose of the present invention and other advantages can realize and obtain by specifically noted structure in the specification of being write, claims and accompanying drawing.
Description of drawings
Accompanying drawing is used to provide further understanding of the present invention, and constitutes the part of specification, is used from explanation the present invention with embodiments of the invention one, is not construed as limiting the invention.In the accompanying drawings:
Fig. 1 is according to the superframe structural representation under 3: 5 modes of the TDD of the embodiment of the invention;
Fig. 2 is the flow chart according to the transmission method under 3: 5 modes of the TDD of the embodiment of the invention.
Embodiment
Below in conjunction with accompanying drawing the preferred embodiments of the present invention are described, should be appreciated that preferred embodiment described herein only is used for description and interpretation the present invention, and be not used in qualification the present invention.
Fig. 1 is the structural representation of superframe under 3: 5 modes of TDD of the embodiment of the invention.
Wherein, Preamble is sent downwards by the base station, for terminal provides overhead information.These 24 PHY Frame will be divided into descending PHY Frame and up PHY Frame, and the several PHY Frame in preamble and front are used for downlink transfer.Also promptly, the descending PHY Frame of transmission catches capable PHY Frame more earlier, hockets so in time.
In technical scheme provided by the invention, it is 3: 5 that these 24 PHY Frame are divided into descending and up number ratio, be called 3: 5 modes of TDD, each downstream transmission blocks is made up of 3 continuous PHY Frame, and each uplink transmission block is made up of 5 continuous PHY Frame.
As shown in Figure 1, concrete dividing mode can be following mode: F0F1F2-〉R0R1R2R3R4-〉F3F4F5-〉R5R6R7R8R9-〉F6F7F8-〉R10R11R12R13R14.
F0 represents descending first PHY Frame, and F1 represents descending second PHYFrame, and by that analogy, therefore the expression of descending 9 PHY Frame is respectively: " F0F1...F8 ".
These continuous 3 PHY Frame of F0F1F2 form first downstream transmission blocks, these continuous 3 PHY Frame of F3F4F5 form second downstream transmission blocks, these continuous 3 PHY Frame of F6F7F8 form the 3rd downstream transmission blocks, and the terminal transmission data message is given by these three downstream transmission blocks in the base station.
R0 represents up first PHY Frame, and R1 represents up second PHYFrame, and by that analogy, therefore the expression of up 15 PHY Frame is respectively: " R0R1...R14 ".
These continuous 5 PHY Frame of R0R1R2R3R4 form first uplink transmission block, and are on the time between first downstream transmission blocks and second downstream transmission blocks, as shown in Figure 1; These continuous 5 PHY Frame of R5R6R7R8R9 form second uplink transmission block, and transmit between second downstream transmission blocks and the 3rd downstream transmission blocks; These continuous 5 PHY Frame of R10R11R12R13R14 form the 3rd uplink transmission block, and transmission after the 3rd downstream transmission blocks.Terminal sends data message by these three uplink transmission blocks to the base station.
For transmission course, the base station is during downstream transmission blocks sends data message to terminal, and terminal can only receive information, and can not send data message to the base station; In like manner, terminal is during uplink transmission block sends data message to the base station, and the base station can only receive information, and can not send data message to terminal.That is to say that base station and terminal can not send information and reception information simultaneously.
Because base station and terminal need the regular hour in receiving the process of carrying out state exchange between information state and the transmission information state, therefore need between downstream transmission blocks and uplink transmission block, insert the protection interval of certain hour length.
Between downstream transmission blocks and uplink transmission block subsequently, need to insert guardtime interval T 0 (guard interval), as shown in Figure 1; In like manner, between uplink transmission block and downstream transmission blocks subsequently, need to insert guardtime interval T 1 (guard interval); T0 and T1 can equate also can be unequal.
Based on above-described frame structure, the invention provides a kind of TDD data transfer mode of the wireless communication system based on the superframe structure, wherein, the wireless communication system up-downgoing link of eating dishes without rice or wine is that unit transmits data with superframe, as mentioned above, each superframe is made up of a preamble and 24 PHY Frame.Leftmost resource square shown in Fig. 1 is superframe preamble, and 24 resource squares on the right are PHY Frame.
In data transmission method according to the embodiment of the invention, base station and terminal are that unit carries out transfer of data with the superframe, in the duration of a superframe, the base station sends one leading to terminal, and sending downlink data to terminal by 9 downstream physical frame, terminal sends upstream data by 15 ascending physical signal frames to the base station.
Preferably, in said method, in the duration of a superframe, the base station at first sends leading to terminal, for terminal provides overhead information.
Particularly, in the duration of a superframe, the base station successively sends downlink data by 3 downstream transmission blocks of being made up of 3 continuous downstream physical frame to terminal; Terminal successively sends upstream data by 3 uplink transmission blocks of being made up of 5 continuous ascending physical signal frames to the base station.
Further, in the duration of a superframe, the base station sends downlink data by the downstream transmission blocks that one or more downstream physical frame are formed to terminal earlier, terminal sends upstream data by the uplink transmission block that one or more ascending physical signal frames are formed to the base station again, so alternately send, the uplink and downlink data respectively send one or many in a superframe duration.
As indicated above, in the duration of a superframe, after the base station sends downlink data and before the terminal transmission upstream data, and/or terminal sends after the upstream data and the base station sends before the downlink data, one time interval was all arranged, all do not send data in the above base station of this time interval and terminal.
Can understand above-mentioned transmission course better by embodiment given below.
At first, the superframe structure that is defined as follows: in superframe, comprise successively a descending transmission block that one leading, 3 continuous downstream physical frame form, the very first time at interval, 5 uplink transmission block, second time interval, 3 another downstream transmission blocks, the 3rd time interval, 5 another uplink transmission block, second time interval, 3 another downstream transmission blocks, the 3rd time interval and 5 another uplink transmission blocks that continuous ascending physical signal frame is formed that continuous downstream physical frame is formed that continuous ascending physical signal frame is formed that continuous downstream physical frame is formed that continuous ascending physical signal frame is formed.
Based on above-mentioned frame structure, base station and terminal are that unit carries out transfer of data with above-mentioned superframe, and particularly, as shown in Figure 2, according to the TDD3 of the embodiment of the invention: the data transmission method of 5 modes can comprise following processing:
Step S202, in the duration of a superframe, the base station at first sends leading to terminal, and the downstream transmission blocks of forming by 3 continuous downstream physical frame sends downlink data to terminal then, and base station and terminal do not send data on very first time interval then;
Step S204, the upstream data that the uplink transmission block that the base station receiving terminal is formed by 5 continuous ascending physical signal frames sends, base station and terminal do not send data on second time interval then;
Step S206, the base station sends downlink data by another downstream transmission blocks that 3 continuous downstream physical frame are formed to terminal again, and base station and terminal do not send data on the 3rd time interval then;
Step S208, the base station upstream data that sends of another uplink transmission block of forming by 5 continuous ascending physical signal frames of receiving terminal more then, base station and terminal do not send data on the 4th time interval then;
Step S210, the base station sends downlink data by another downstream transmission blocks that 3 continuous downstream physical frame are formed to terminal again, and base station and terminal do not send data on the 5th time interval then;
Step S212, the base station is the upstream data that sends of another uplink transmission block of forming by 5 continuous ascending physical signal frames of receiving terminal again.
By above-mentioned at least one technical scheme provided by the invention, solved the partition problem of the uplink and downlink of PHY frames, also solved problems such as resource allocation, time delay and protection interval simultaneously.
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 (12)
1. the transmission method of a TDD radio communication system, it is characterized in that, base station and terminal are that unit carries out transfer of data with the superframe, in the duration of a superframe, described base station sends one leading to described terminal, and pass through 9 downstream physical frame to described terminal transmission downlink data, described terminal sends upstream data by 15 ascending physical signal frames to described base station.
2. transmission method according to claim 1 is characterized in that, in the duration of a superframe, described base station at first sends described leading to described terminal, overhead information is provided for described terminal.
3. transmission method according to claim 1 is characterized in that, in the duration of a superframe, described base station successively sends downlink data by 3 downstream transmission blocks of being made up of 3 continuous downstream physical frame to described terminal; Described terminal successively sends upstream data by 3 uplink transmission blocks of being made up of 5 continuous ascending physical signal frames to described base station.
4. according to claim 1 or 3 described transmission methods, it is characterized in that, in the duration of a superframe, described base station sends downlink data by the downstream transmission blocks that one or more downstream physical frame are formed to described terminal earlier, described terminal sends upstream data by the uplink transmission block that one or more ascending physical signal frames are formed to described base station again, so alternately send, the uplink and downlink data respectively send one or many in a superframe duration.
5. according to claim 1 or 3 described transmission methods, it is characterized in that, in the duration of a superframe, after described base station sends downlink data and before the described terminal transmission upstream data, and/or described terminal sends after the upstream data and described base station sends before the downlink data, one time interval was all arranged, and on this time interval, described base station and described terminal all do not send data.
6. the transmission method of a TDD radio communication system, it is characterized in that, base station and terminal are that unit carries out transfer of data with the superframe, in the duration of a superframe, described base station at first sends leading to described terminal, the downstream transmission blocks of forming by 3 continuous downstream physical frame sends downlink data to described terminal then, then on very first time interval, described base station and described terminal do not send data, described then base station receives the upstream data of described terminal by the uplink transmission block transmission of 5 continuous ascending physical signal frames compositions, on second time interval, described base station and described terminal do not send data, then, described base station sends downlink data by another downstream transmission blocks that 3 continuous downstream physical frame are formed to described terminal again, on the 3rd time interval, described base station and described terminal do not send data, then, described base station receives the upstream data of described terminal by another uplink transmission block transmission of 5 continuous ascending physical signal frames compositions again, on the 4th time interval, described base station and described terminal do not send data, then, described base station sends downlink data by another downstream transmission blocks that 3 continuous downstream physical frame are formed to described terminal again, on the 5th time interval, described base station and described terminal do not send data, then, described base station receives the upstream data of described terminal by another uplink transmission block transmission of 5 continuous ascending physical signal frames compositions again.
7. the frame structure of a TDD radio communication system, it is characterized in that, described frame structure is a superframe, described superframe by one leading and 24 physical frames form, these 24 physical frames are that 3: 5 mode is divided into downstream physical frame and ascending physical signal frame according to descending and up number ratio.
8. frame structure according to claim 7 is characterized in that, the described leading original position that is positioned at described frame structure comprises overhead information.
9. frame structure according to claim 7 is characterized in that, comprises 3 downstream transmission blocks of being made up of 3 continuous downstream physical frame in the described superframe, and 3 uplink transmission blocks of being made up of 5 continuous ascending physical signal frames.
10. according to claim 7 or 9 described frame structures, it is characterized in that, in the described superframe from original position, be provided with the downstream transmission blocks that one or more downstream physical frame are formed earlier, be provided with the uplink transmission block that one or more ascending physical signal frames are formed afterwards, comprise one or more groups alternatively distributed like this uplink transmission block and downstream transmission blocks in the superframe.
11. frame structure according to claim 10 is characterized in that, is inserted with the guardtime interval of certain hour length between described downstream transmission blocks and described uplink transmission block; The guardtime that between described uplink transmission block and downstream transmission blocks subsequently, also is inserted with certain hour length at interval, this guardtime at interval with equate at interval at the described guardtime that inserts between described downstream transmission blocks and the described uplink transmission block or unequal.
12. the frame structure of a TDD radio communication system, it is characterized in that, described frame structure is a superframe, comprises successively that in superframe one is leading, 3 descending transmission blocks that continuous downstream physical frame is formed, the very first time at interval, 5 uplink transmission blocks that continuous ascending physical signal frame is formed, second time interval, 3 another downstream transmission blocks that continuous downstream physical frame is formed, the 3rd time interval, 5 another uplink transmission blocks that continuous ascending physical signal frame is formed, the 4th time interval, 3 another downstream transmission blocks that continuous downstream physical frame is formed, the 5th time interval and 5 another uplink transmission blocks that continuous ascending physical signal frame is formed.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2008100083278A CN101515848A (en) | 2008-02-22 | 2008-02-22 | Frame structure and data transmission method for time division duplexing wireless communication system |
| PCT/CN2009/070283 WO2009097806A1 (en) | 2008-02-04 | 2009-01-22 | Frame structure and transmission method in a time division duplex wireless communication system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2008100083278A CN101515848A (en) | 2008-02-22 | 2008-02-22 | Frame structure and data transmission method for time division duplexing wireless communication system |
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| CN101515848A true CN101515848A (en) | 2009-08-26 |
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| CNA2008100083278A Pending CN101515848A (en) | 2008-02-04 | 2008-02-22 | Frame structure and data transmission method for time division duplexing wireless communication system |
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Application publication date: 20090826 |