Method for optimizing blind ultraviolet non line-of-sight Ad-hoc communication network shared channel

A technology of communication network and optimization method, which is applied in the field of shared channel optimization of solar-blind ultraviolet non-line-of-sight Ad-hoc communication network, and can solve problems such as directional beam directional transmission business conflicts, limited, time-space conflicts, etc.

Inactive Publication Date: 2014-03-19
CHONGQING TELECOMMUNICATION INSTITUTE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The problems that exist when the solar-blind ultraviolet non-line-of-sight Ad-hoc communication network nodes share the channel are actually caused by the directivity of the directional beam and the conflict of multiple ultraviolet node transmission services within the coverage of the omnidirectional or directional beam. of
Therefore, in a solar-blind ultraviolet non-line-of-sight Ad-hoc network system with n ultraviolet nodes, due to the directivity of the directional beam and the space-time competition characteristics of the data flow in it, the nodes in the deaf area cannot communicate and communicate with each other. When the source node or destination node in the interference area sends or receives data at the same time, there will be time and space conflicts, resulting in limited source node-destination node pairs that can successfully transmit data at the same time

Method used

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  • Method for optimizing blind ultraviolet non line-of-sight Ad-hoc communication network shared channel
  • Method for optimizing blind ultraviolet non line-of-sight Ad-hoc communication network shared channel
  • Method for optimizing blind ultraviolet non line-of-sight Ad-hoc communication network shared channel

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0196] Example 1: In the hardware environment of Pentium(R) Dual-Core CPU, E5200 2.50GHz 1.21GHz, 2.00GB, the link conflict graph with 10 nodes, 16 nodes, and 21 nodes is dyed, and the following results are obtained. result:

[0197] It can be seen from Figure 7, Figure 8, Figure 9 and Table 1 that only 2 colors are used for the optimal coloring of the link conflict graph of 10 nodes, only 3 colors are used for 21 nodes, and only 3 colors are used for 16 nodes. The optimal coloring of the link conflict graph of nodes also uses 4 colors. This is because the relationship between the edges and vertices of the link conflict graph of 16 nodes is higher than the relationship between the edges and vertices of the link conflict graph of 21 nodes. Complex, so the number of colors used is relatively increased. But in terms of running time, 16 nodes took 48.59420s, and 21 nodes took 98.9220s, and the time spent was mainly used for the greedy algorithm operation when the group was initia...

Embodiment 2

[0200] Example 2: NS2 is used to simulate a scenario where 10 nodes are randomly distributed in an area of ​​1000m*1000m, the transmission range of the nodes is 200 meters, and the node movement is assumed to be a random walk. The main parameters of the simulation are shown in Table 2.

[0201] Table 2

[0202] parameter

value

number of nodes

10

Simulation range

1000m×1000m

packet size

216bit

Simulation time

1000s

physical layer rate

1028b / s

Node movement maximum speed

20m / s

[0203] Figure 12 The system throughput of UVAd-TDMA protocol and IEEE802.11 is compared. Under the same load, the system throughput of the UVAd-TDMA protocol is significantly improved compared with IEEE802.11. The reason for the improvement is that the UVAd-TDMA protocol uses the shared channel optimal allocation algorithm and the ultraviolet directional beam to increase the reuse of the time slot, which improves the...

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Abstract

The invention discloses a method for optimizing a blind ultraviolet non line-of-sight Ad-hoc communication network shared channel. The method comprises the following steps: firstly, drawing up conflict graphs under three communication modes according to the characteristics of a blind ultraviolet non line-of-sight Ad-hoc network, and proposing a conflict avoidance model; then constructing a link conflict graph based on the conflict avoidance model, and proposing a dyeing theory to be applied on a time slot allocation control method of the blind ultraviolet non line-of-sight Ad-hoc communication network shared channel; further proposing a UVAd-TDMA protocol suitable for the blind ultraviolet non line-of-sight Ad-hoc network. The local link conflict graphs obtained by the method are small in color point quantity, namely the time slots divided within unit time are few, so that the target that different complementary interference channels are distributed to conflicted links by using the least time slot quantity within the unit time by the blind ultraviolet non line-of-sight Ad-hoc communication network is achieved.

Description

technical field [0001] The invention relates to a method for optimizing a shared channel of a solar-blind ultraviolet non-line-of-sight Ad-hoc communication network. Background technique [0002] Ultraviolet light communication in solar-blind areas is a communication method for information transmission through atmospheric scattering. It has non-line-of-sight NLOS (Non-Line-of-Sight) transmission, good confidentiality, strong anti-interference ability, and low construction and maintenance costs advantage. The above advantages make UV light communication in solar-blind areas widely used as a good alternative to radio frequency communication in rural, urban outdoor environments and military communication environments. However, due to the strong absorption of solar-blind ultraviolet light by near-Earth atmospheric molecules and particles, its transmission distance is limited. [0003] Wireless Ad-hoc network is a kind of temporary centerless distributed network, its nodes can ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04B10/11H04L29/06G06N3/12
Inventor 杨娟李晓毅赵芳
Owner CHONGQING TELECOMMUNICATION INSTITUTE
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