Method for passing token in wireless dynamic token ring network
A token ring and token technology, applied in wireless communications, electrical components, etc., can solve problems such as network performance degradation, maintain dynamics, improve token transfer efficiency and network data transmission performance, ensure the minimum number of hops and least time effect
Active Publication Date: 2011-03-30
SHANGHAI MUNICIPAL ELECTRIC POWER CO +1
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That is to say, after the channel changes, the order of token transfer is changed from the initial A-B-C-E-D-A to A-B-C-D-E-C-A, the token is passed twice at node C, and the number of token transfer hops increases by one hop, which will lead to network performance degradation
In the second case, if the token is in the second round of circulation, the channel recovery from node C to node E is valid, because WDTP does not have an effective recovery mechanism for channel recovery, the order of token transfer is still A-B-C-D-E-D-A, at this time the token After passing it twice at node D, the number of token passing hops also increases by one hop, which also leads to a decrease in network performance
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[0025] The invention will be described in more detail hereinafter with reference to the accompanying drawings showing embodiments of the invention. However, this invention may be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art. In these drawings, the size and relative sizes of layers and regions may be exaggerated for clarity.
[0026] now refer to figure 2 ~4, describe in detail the token passing method using queue backup according to the present invention.
[0027] image 3 Shown is the basic structure of the token used by the wireless dynamic token ring. Such as image 3 As shown, the tokens used in this embodiment include FT, NN, SA, DA, NAM, HOP and CYCLE. FT is the protocol version and token type, such as token, invitation signaling, ne...
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The invention discloses a method for passing a token in a token ring network, which is used for carrying out communication in the network by way of token passing, wherein the network comprises a plurality of communicating nodes, and the communicating nodes are annularly connected by an Ethernet network. The method comprises the following steps: (a) a source node acquires the token for obtaining acommunication right so as to carry out data transmission, then passes the token to a target node; (b) when the token passing fails, the source node backups an ordered queue thereof; and (c) when somenode in receive status in the network finds that a new neighbor node passes the token, the ordered queue is replaced by the backup ordered queue. Through backuping TPQ and comparing the positions of the new neighbor node and a subsequent node, the invention has the advantages of ensuring the dynamics maintenance of the network token passing process when a wireless channel changes abruptly, and guaranteeing the minimum passing hops and the minimum passing time, thereby improving the token passing efficiency and the network data transmission performance.
Description
technical field [0001] The invention relates to the technical field of wireless sensor networks, in particular to a token transfer method in a wireless token ring network. Background technique [0002] Due to the simple network structure and high throughput of the token ring network, it has become one of the technical standards for wired networks, and the improved wireless dynamic token ring technology for wireless sensor networks has also become a research hotspot. Token Protocol (WDTP) is an important protocol of wireless dynamic token ring technology. [0003] WDTP divides the entire network into multiple subnets, which contain a master node and multiple common nodes. The master node is responsible for generating tokens and managing the entire subnet. There is only one token in a subnet and it is circulated among nodes in the subnet. Only nodes holding tokens can transmit data, and other nodes can only receive data. WDTP avoids the conflict of data in the subnet through...
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IPC IPC(8): H04W74/04
Inventor 范光宇迟冬祥
Owner SHANGHAI MUNICIPAL ELECTRIC POWER CO