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A Realization Method of Wireless Ad Hoc Network

A wireless ad hoc network and implementation method technology, applied in wireless communication, network topology, network planning and other directions, can solve the problems of affecting system throughput, lack of good scheduling mechanism for different types of services, low transmission efficiency, etc. The effect of resource reservation and preemption, improving time slot utilization, and increasing the number of terminals

Inactive Publication Date: 2019-08-27
BEIJING XINWEI TELECOM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In a traditional centerless network, when this method is applied to broadcast services, such as PTT (voice broadcast), it is necessary to compete or negotiate resources with all adjacent nodes, considering that it is difficult to coordinate and unify the available resources of all adjacent nodes, and during the reservation process A large amount of control information may collide during transmission, so there is a high possibility of resource acquisition failure, and the transmission efficiency is low
In addition, the current mainstream decentralized network does not have a good scheduling mechanism for different types of services. It may occur that the resources occupied by reserved unicast services are relatively discrete, resulting in the situation that broadcast services cannot be reserved, and cannot accommodate as much as possible. Guarantee the smooth progress of high-priority business under the premise of possible multi-business
[0004] In addition, in the public TDMA-based wireless ad hoc network system seen so far, the division of all time slots is similar to the above, and a guard interval is reserved between each time slot to avoid problems caused by different distances between nodes and timing accuracy. The time slot collision, but at the same time, each time slot will reduce the slot utilization while retaining the guard interval, which further affects the throughput of the entire system

Method used

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  • A Realization Method of Wireless Ad Hoc Network
  • A Realization Method of Wireless Ad Hoc Network
  • A Realization Method of Wireless Ad Hoc Network

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0052] This embodiment will describe in detail the special wireless frame structure adopted by the wireless ad hoc network. The wireless superframe for inter-node communication consists of a common control area, an intra-cluster control area, and several data and PTT areas, such as figure 2 shown.

[0053] The common control area consists of synchronization area, cluster broadcast area, cross-cluster PTT service instruction area, cross-cluster routing and control message area, such as image 3 shown. This embodiment uses the public frequency hopping mode in the public control area, that is, the nodes of the entire network use the same frequency hopping mode (the public frequency hopping mode selects a narrowband frequency band used by the nodes of the entire network, rather than the specific use of the frequency domain subcarrier position ).

[0054] Nodes send and receive synchronization signals and synchronization channels in the synchronization area of ​​the common cont...

Embodiment 2

[0078] The cross-cluster PTT service indication area in the common control area in the frame structure and the intra-cluster PTT service indication area in the intra-cluster control area are divided into several cross-cluster PTT indication time slots, cross-cluster data broadcast indication time slots, and intra-cluster PTT indication time slots. slots and intra-cluster data broadcast indication slots. The difference between this embodiment and Embodiment 1 is:

[0079] The node can randomly select the indicated time slot to use for resource preemption of cross-cluster PTT service, cross-cluster data broadcast service, intra-cluster PTT service and intra-cluster data broadcast service;

[0080] Nodes can also use statically configured indicated time slots according to node IDs to preempt resources for cross-cluster PTT services, cross-cluster data broadcast services, intra-cluster PTT services, and intra-cluster data broadcast services.

Embodiment 3

[0082] The wireless ad hoc network of the present embodiment is a TDMA system, and a section of Guard (guard interval) can be reserved between each time slot in the TDMA system, such as Figure 10 As shown, the purpose is to prevent users at different locations from transmitting on adjacent time slots to avoid time slot collisions. If a single user occupies consecutive time slots, time slot collisions will not occur, so the guard interval in the middle can be As an available symbol, make full use of it, so as to achieve the purpose of improving system efficiency. Based on this idea, this embodiment defines two states of time slot transmission: continuous transmission state and discontinuous transmission state, wherein the continuous transmission state means that when a node occupies a continuous time slot, it can transmit on a given time slot, or Data can be sent on the Guard between the two time slots before and after; the discontinuous transmission state means that the node ...

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Abstract

The invention provides a method for realizing a wireless ad hoc network. The wireless ad hoc network is used for dividing in-cluster and inter-cluster control information to different areas in a wireless frame structure. Furthermore a control area and a data area which are specialized for each broadcast service are divided in the wireless frame structure. The method realizes overall scheduling on different types of services with different priorities through a specific frame structure. Furthermore through reserving a specialized control resource area and a data resource area for the high-priority broadcast service, service priority insurance is realized.

Description

technical field [0001] The invention relates to the field of wireless communication, in particular to a method for realizing a wireless ad hoc network. Background technique [0002] In the public wireless ad hoc networks seen so far, the more common and mature technical solutions are represented by Mesh technology based on IEEE802.16, and its Mesh mode physical frame structure is as follows: figure 1 shown. A radio frame includes a control subframe and a data subframe. The control subframe occupies a predetermined OFDM symbol at the front end of each frame, which can be divided into several time slots, and the remaining symbols are symbols of the data subframe. The control subframe is fixed to use QPSK modulation and 1 / 2 code rate RS-CC coding. The data subframe can adopt a custom modulation and coding method, but it does not support changing every Mesh frame. At the end of the radio frame is a reserved guard interval. [0003] In a decentralized network, because there i...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04W16/10H04W72/12H04W84/18
Inventor 孙鹏俞岚周淼李静叶董付现
Owner BEIJING XINWEI TELECOM TECH
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