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
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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 n

Method used

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Examples

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Example Embodiment

[0016] The present invention uses the Timestamp field in the MSH-NCFG message specified in the 802.16d protocol to achieve synchronization between nodes; the primitive message is designed for the interaction between the MAC layer and the radio frequency to accurately realize the internal MAC and the radio frequency of the node Synchronization. It is characterized by including the following steps: clock synchronization within nodes, clock synchronization between nodes, and processing of the Timestamp field of neighbor nodes. The clock synchronization between nodes includes the initial clock synchronization when entering the network and the synchronization correction and maintenance after entering the network.

[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. Because there is a certain time delay in data transmission betwee...

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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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