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Mixing automatic re-transmission method and apparatus for TDD system

A technology of time division duplex system and hybrid automatic retransmission, applied in the direction of duplex signal operation, error prevention/detection using return channel, etc., can solve the increase of complexity and manufacturing cost, increase of manufacturing cost, and increase of system design complexity and other problems to achieve the effect of reducing complexity

Active Publication Date: 2009-04-22
DATANG MOBILE COMM EQUIP CO LTD
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Problems solved by technology

[0038] To sum up, in the two existing synchronous HARQ implementation methods introduced above, since the ACK / NACK feedback and the HARQ Process id in the HARQ transmission process need to be determined through various parameters according to different situations, it leads to system design complexity increase, the corresponding manufacturing cost will also increase
For a TDD system with more uplink and downlink switching points in the frame structure, more subframes contained in the frame, and a more complex frame structure, the increase in design complexity and manufacturing cost for HARQ will be more obvious

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  • Mixing automatic re-transmission method and apparatus for TDD system
  • Mixing automatic re-transmission method and apparatus for TDD system
  • Mixing automatic re-transmission method and apparatus for TDD system

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Embodiment Construction

[0057] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below with reference to the accompanying drawings and examples.

[0058] The embodiment of the present invention mainly sets the length and number of TTIs for the downlink subframe and the uplink subframe respectively according to the acquired uplink and downlink ratio information of the subframe of the wireless frame in the time division duplex system, so that the uplink and downlink TTI numbers are the same, And establish a one-to-one correspondence, so that in the HARQ transmission process, there can be a fixed correspondence between ACK / NACK feedback, HARQ process id and TTI, and the ACK / NACK feedback and HARQ process can be easily determined through TTI id, so that the HARQ process in the time division duplex system can be simplified, thus reducing the design complexity of the TDD system that implements HARQ.

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Abstract

The invention discloses a hybrid automatic repeat method for a time division duplex system. The method ensures that the TTI numbers of an uplink and a downlink are the same by setting the length and the number of TTI in a frame structure, thus establishing the one-to-one corresponding relationship between TTI of the uplink and the downlink, so that in the HARQ transmission process, fixed relationship can exist among the feedback of ACK / NACK, HARQ process id and TTI. The feedback of ACK / NACK and HARQ process id can be easily determined by TTI, thus reducing the complexity of realizing the TDD system design of HARQ effectively.

Description

technical field [0001] The invention relates to the technical field of time division duplex, in particular to a hybrid automatic retransmission method and device for a time division duplex system. Background technique [0002] At present, in high-speed downlink packet access (HSDPA, High Speed ​​Downlink Packet Access), high-speed uplink packet access (HSUPA, High Speed ​​Uplink Packet Access) and future long-term evolution (Long Term Evolution, LTE) technologies, in order to correct transmission errors Fast feedback retransmission of the data blocks, and make full use of the information carried by the wrong data through data block merging. As a better solution, Hybrid Automatic Repeat Request (HARQ, Hybrid Automatic Repeat Request) technology has been adopted by various communications system adopted. Many communication systems, such as HSDPA, HSUPA and future LTE, adopt multi-channel parallel stop and other HARQ protocols to support continuous scheduling and transmission o...

Claims

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Application Information

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IPC IPC(8): H04L1/18H04L1/16H04L5/14
Inventor 索士强肖国军唐海王可孙韶辉王映民
Owner DATANG MOBILE COMM EQUIP CO LTD
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