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Method for judging repeat SRP command frame

A technique for retransmitting protocols and command frames, applied in transmission systems, error prevention/detection through transmission repetition, electrical components, etc., can solve problems such as consuming storage space and low efficiency, and achieve saving storage space, ensuring rollback, The effect of improving system operation efficiency

Inactive Publication Date: 2006-04-05
HUAWEI TECH CO LTD
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  • Summary
  • Abstract
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] In order to solve the problems of inefficiency and consumption of storage space in the above-mentioned prior art method, the purpose of the present invention is to provide a simple and efficient method for judging the retransmitted SRP command frame

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  • Method for judging repeat SRP command frame
  • Method for judging repeat SRP command frame
  • Method for judging repeat SRP command frame

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Embodiment Construction

[0020] Refer to the following Figure 3 to Figure 6 Embodiments of the present invention are described in detail.

[0021] In one embodiment of the present invention, established as image 3 shown in the serial number bit table. Such as Figure 4 As shown, the list occupies 32 bytes, 8 bits in each byte, for a total of 256 bits. These 256 bits correspond to 256 sequence numbers of the SRP command frame respectively. For example, use bit 0 to represent serial number 1 (SN1), bit 1 to represent serial number 2 (SN2), ..., bit 255 to represent serial number 256 (SN256). In this example, set 0 to indicate that the SRP command frame with the corresponding sequence number has not been received, and 1 to indicate that the SRP command frame with the corresponding sequence number has been received. At the beginning, all bit values ​​are cleared to zero.

[0022] When the receiving terminal receives an SRP command frame from the sending terminal, it takes out the sequence number i...

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Abstract

The invention discloses a method for judging the retransmitted SPR command frame in the H.324 protocol comprising: arranging a sequence bit table, while each bit of said table is relative to one sequence number; when receiving the SPR command frame, fixing the condition of the bit relative to the sequence number of said SPR command frame; according to the condition of said bit, judging that if said SPR command frame is retransmitted; if not, changing the condition of the bit of said sequence table relative to the sequence number of said SPR command frame. The invention can overcome the problems of lower efficiency and space waste of present technology and confirm the correct deleting of the record of received SPR command sequence number which is over time-effect.

Description

field of invention [0001] The invention relates to a method for judging a retransmitted Simple Retransmission Protocol (SRP) command frame, in particular to a method for judging a retransmitted SRP command frame in the H.324 protocol. Background technique [0002] The H.324 protocol is a low-rate multimedia communication terminal protocol. The H.324 terminal multiplexes audio, video, data, and control plane signaling according to the H.223 protocol, transmits them to the peer end, and demultiplexes them by the peer end. Separate out audio, video, data, and control plane signaling. The control plane signaling is defined in the H.245 protocol, which requires a reliable link layer for transmission. [0003] In the H.324 protocol, a Simple Retransmission Protocol (SRP) is defined to ensure reliable transmission of H.245 signaling. Under the SRP protocol, each time an SRP command frame is sent, the sequence number is accumulated modulo 256. If the SRP response frame is not rec...

Claims

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Application Information

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IPC IPC(8): H04L29/06H04L1/08
Inventor 高顺纪
Owner HUAWEI TECH CO LTD
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