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MAC (Media Access Control) layer synchronizing method improved based on IEEE 802.16d

A technology of clock synchronization and synchronization correction, which is applied in the communication between multiple stations, electrical components, time division multiplexing system, etc., and can solve problems such as not taking into account the synchronization problem

Inactive Publication Date: 2010-08-11
BEIJING JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The 802.16d standard describes the synchronization mechanism between nodes, including rough synchronization when a new node joins the network and fine synchronization after joining the network, but does not take into account the synchronization problems in some unexpected situations such as nodes leaving the network or nodes disconnecting from the network. , and the clock synchronization problem inside the node

Method used

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Embodiment Construction

[0016] The present invention utilizes the Timestamp field in the MSH-NCFG message stipulated in the 802.16d protocol to realize synchronization between nodes; design a primitive message for the interaction between the MAC layer and the radio frequency, so as to accurately realize the communication between the MAC layer and the radio frequency within the node synchronization. It is characterized in that it includes the following steps: internal clock synchronization between nodes, clock synchronization between nodes and processing of Timestamp fields of neighbor nodes, wherein the clock synchronization between nodes includes initial clock synchronization when entering the network and synchronization correction and maintenance after network access.

[0017] The specific content of the clock synchronization inside the node includes: the clock synchronization inside the node mainly refers to the synchronization between the MAC layer and the radio frequency. Since there is a certai...

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PUM

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Abstract

The invention discloses an MAC (Media Access Control) layer synchronizing method improved based on IEEE 802.16d, which is used for realizing synchronization among nodes and synchronization between an MAC layer inside the nodes and radio frequency. The invention adopts the technical scheme as follows: realizing the synchronization among nodes by using a time stamp field in an MSH-NCFG message specified in a 802.16d protocol; and designing a primitive message for interaction between the MAC layer and the radio frequency to correctly realize the synchronization among nodes and the synchronization between the interiors of the nodes. The method is characterized by comprising the steps of clock synchronization of the interiors of the nodes, clock synchronization among nodes and processing of the time stamp field of neighboring nodes, wherein the clock synchronization among nodes comprises primary clock synchronization in network accessing and synchronous correction and maintenance after network accessing.

Description

technical field [0001] The invention relates to an improved MAC layer synchronization method, in particular to an improved MAC layer synchronization method based on IEEE 802.16d, belonging to the field of wireless ad hoc network communication. Background technique [0002] The Mesh network stipulated in the IEEE 802.16d standard adopts the TDD working method, and the most important and difficult part of the system based on time division duplexing is the synchronization of the clock. Therefore, whether the clock synchronization design is effective or not determines the system to a large extent. performance. [0003] The 802.16d standard describes the synchronization mechanism between nodes, including rough synchronization when a new node joins the network and fine synchronization after joining the network, but does not take into account the synchronization problems in some unexpected situations such as nodes leaving the network or nodes being disconnected from the network. ,...

Claims

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Application Information

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IPC IPC(8): H04J3/06H04B7/26
Inventor 李旭申宏刚姜晓丽李富艳
Owner BEIJING JIAOTONG UNIV
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