Underwater acoustic communication network time division multiple address (TDMA) method
An underwater acoustic communication network and time-division multiplexing technology, which is applied in time-division multiplexing systems, multiplexing communications, electrical components, etc., can solve problems such as clock synchronization difficulties and achieve high time utilization
Inactive Publication Date: 2015-03-11
HARBIN ENG UNIV
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Problems solved by technology
However, the key to realizing the TDMA protocol is to have strict frame synchronization timing, and it is very difficult to achieve strict clock synchronization in underwater acoustic communication networks
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[0025] The present invention will be further described below in conjunction with accompanying drawing:
[0026] The present invention does not need strict global clock synchronization, does not need to repeatedly broadcast synchronous signals, and completes schedule correction during data transmission.
[0027] The network adopts a centralized topology and consists of a master node and several sub-nodes. In the initialization phase, the master node obtains the propagation delay with each sub-node by means of a response, arranges the data sending time of each sub-node interleaved according to the size of the propagation delay, establishes the corresponding data receiving interval on the local time axis, and The schedule is sent to all sub-nodes by broadcasting.
[0028] The schedule information includes node ID, network duty cycle T, propagation delay T pd , the adjustment value of sending time t m , each sub-node obtains the corresponding information from the timetable acco...
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The invention relates to the field of underwater acoustic communication, particularly to an underwater acoustic communication network time division multiple address (TDMA) technology, which does not require strict synchronization of all node clocks in a whole network, does not require periodically broadcasting synchronizing signal and adopts a centralized network topology for realizing TDMA. The method comprises the following steps: a host node broadcasts an initialize signal, arranges transmission timeslots of partial nodes, establishes corresponding receiving timeslots, and broadcasts the finished schedule to the partial nodes; the partial nodes acquire corresponding information from the schedule according to ID numbers; interception is executed; whether the clock drift is in a safe area is judged; and the partial nodes intercept the notification signal sent by the host node during the interception duration. According to the method, strict synchronization of all node clocks in the whole network is not required; the host node and the partial nodes work by taking a local clock as a reference; the synchronizing signal does not need to be periodically broadcast; schedule revision is completed during data communication process; and working timeslots of the partial nodes are arranged in a staggered manner, so that the time availability is high.
Description
technical field [0001] The invention relates to the field of underwater acoustic communication, in particular to a time-division underwater acoustic communication network that does not require strict synchronization of all node clocks in the entire network, does not need to periodically broadcast synchronous signals, and adopts a centralized network topology when implementing time-division multiplexing. multiplexing (TDMA) technology. Background technique [0002] In recent years, with the development of underwater acoustic communication technology, underwater acoustic communication network has gradually become a research hotspot at home and abroad. Due to the long propagation delay, narrow available bandwidth, low transmission rate and complex time-varying multipath of underwater acoustic channels, many mature protocols in land wireless communication networks cannot be directly applied to underwater acoustic communication networks. For competitive protocols based on the ha...
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IPC IPC(8): H04L29/06H04B13/02H04J3/00
Inventor 乔钢章佳荣马雪飞周锋孙宗鑫刘淞佐张禹尹艳玲聂东虎杨健敏
Owner HARBIN ENG UNIV