Status report method of automatic retransfer request

An automatic retransmission request and status report technology, which is applied in the direction of error prevention/detection using the return channel, can solve problems such as bad loops, reduce ARQ efficiency, and slow window sliding speed, so as to avoid delay and improve overall performance , reducing the effect of sending

Inactive Publication Date: 2007-08-01
ZTE CORP
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Problems solved by technology

If there are many frames waiting for a response in the ARQ window, and the timing for HARQ to deliver ACK to the upper layer has not yet arrived, the sliding speed of the window will slow down, and even the sliding window method will evolve into a stop-and-wait method, which reduces the efficiency of ARQ.
At the same time, due to the delay in sending new PDUs from ARQ to the HARQ layer, the efficiency of HARQ is reduced, resulting in a bad cycle, which reduces the ov

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  • Status report method of automatic retransfer request
  • Status report method of automatic retransfer request

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[0025] Analyzing the defects of the existing technology, the main reason is that the ARQ entity can only passively accept the status report information regularly reported by the HARQ entity, and when the period is not up, it may affect the transmission efficiency due to too many unconfirmed received data packets. But in fact, at this time, at the HARQ entity side, it is very likely that there are several reception confirmation messages, but they have not been sent to ARQ because the cycle has not yet arrived. Therefore, if ARQ can proactively request a status report from HARQ, the above problems will be solved.

[0026] According to the present invention, the timing of the ARQ active request status report can be determined by presetting the "maximum unacknowledged window threshold".

[0027] In this way, when the underlying HARQ receives a non-confirmation NACK message and fails the maximum number of retransmissions, or receives a NACK / ACK error indication (that is, a receipt ...

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Abstract

The invention discloses a kind of state report method of sender retransmits demand automatically, firstly sliding window of sender retransmits demand automatically is set ''maximum unacknowledged window threshold''; the ARQ noumenon sends ARQ PDU data pack to HARQ noumenon; the HARQ noumenon receives PDU from ARQ noumenon, and cascade or cascaded processed based on the instantaneous channel condition, sends HARQ PDU to receiver; the ARQ noumenon executes the window sliding operation based on the received message, and detects current unacknowledged window value; when it detects that it exceed the preset ''maximum unacknowledged window threshold'', it sends the ''demand state report message'' to the HARQ noumenon; the HARQ noumenon judges if the received message is ''demand state report message'' sent by the ARQ noumenon, the current saved accept confirmation message to the ARQ noumenon. The invention decreases time delay and increases the integral performance of system.

Description

technical field [0001] The invention relates to the technical field of digital mobile communication, in particular to a processing method for an automatic repeat request (ARQ) in a third-generation mobile communication long-term evolution system. Background technique [0002] The user plane of the third-generation mobile communication long-term evolution system uses a combination of upper-layer automatic repeat request (ARQ) and lower-layer hybrid automatic repeat request (HARQ) to achieve reliable transmission. The HARQ entity (entity) is located at the physical layer and the medium access control layer (MAC) of the base station, and the ARQ entity is located at the MAC layer of the base station. The upper-layer ARQ adopts the sliding window mechanism, and the lower-layer HARQ adopts N-channel stop and other protocols. [0003] For the ARQ status report mechanism, there have been suggestions for improvement as follows: when the HARQ at the sending end receives a NACK (not ...

Claims

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Application Information

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IPC IPC(8): H04L1/18
Inventor 张健
Owner ZTE CORP
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