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Auxiliary directional access control method of spare nodes in WLAN

An access control and idle node technology, applied in digital transmission systems, electrical components, error prevention and other directions, can solve the problems of wasting channel resources and poor fairness, increase logarithms, avoid hidden node problems, and improve channel utilization. Effect

Active Publication Date: 2015-05-20
XIDIAN UNIV
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AI Technical Summary

Problems solved by technology

This method reduces hidden terminals, but in the same network, some users may communicate more, and some users may communicate less. Covering multiple users sequentially wastes channel resources, and the fairness is poor.

Method used

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  • Auxiliary directional access control method of spare nodes in WLAN
  • Auxiliary directional access control method of spare nodes in WLAN
  • Auxiliary directional access control method of spare nodes in WLAN

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Embodiment Construction

[0039]The traditional DMAC protocol is implemented by requesting to send / allowing to send RTS / CTS signals to reserve channels. When the surrounding nodes hear the handshake signal, DNAV settings are performed, and beams in the direction that will cause interference are blocked to realize distributed beam switching control. However, in a WLAN system using beam switching antennas, handshake signals for channel reservation may be missed during directional transmission / reception, causing hidden node problems. Such as image 3 As shown, nodes A, D communicate with C, B, and the beam of node A locks on beam 3 for directional data transmission and reception, so the DRTS / DCTS handshake signal between B and C is missed. After the transmission between A and D ends, if the new destination node of node A is B, C or F, the DRTS in the direction of beam 4 will interfere with the data transmission between nodes B and C; and A repeats the request until B ends the communication with C Returns...

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Abstract

The invention provides an auxiliary directional access control method of idle nodes in WLAN. The method comprises the following steps: firstly monitoring a channel by a source node, after the channel is idle, sending a Directional Request To Send (DRTS) information; after an idle neighbor node receives the DRTS, judging whether the DRTS causes interference on communication among other nodes according to an information list, if interference is caused, sending a Neighbor Information Package (NIP) to the source node by the idle neighbor node, and blocking the transmission of the source node; if interference is not caused, updating a Directional Network Allocation Vector (DNAV) value in the DRTS information list according to the DRTS, sending Directional Clear To Send (DCTS) information to the source node by a destination node by using a wave beam in the DRTS direction of a receiving source node, beginning to send data by the source node and confirming successful transmission after the response of the destination node is received, and returning to a monitoring state. The problem of hidden nodes caused by handshaking signal listening missing is avoided, the pair number of parallel transmission nodes is increased, and the channel utilization rate is improved.

Description

technical field [0001] The invention belongs to the technical field of media access control MAC in a wireless local area network (WLAN), and relates to an access control method for suppressing interference caused by beam switching antennas assisted by idle nodes, in particular to a directional access control method assisted by idle nodes in WLAN . Background technique [0002] With the continuous development of wireless local area network (WLAN), the interference problem between nodes in WLAN is becoming more and more serious. In order to reduce the interference between nodes, the industry introduces beam-switching antennas into WLAN systems, and makes full use of beam-switching antennas to improve spatial multiplexing and network performance. The beam switching antenna uses a directional working mode in the data communication process, which will cause the leakage of the request to send / permission to send RTS / CTS handshake signals, thereby creating new hidden nodes and caus...

Claims

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Application Information

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IPC IPC(8): H04L1/00
Inventor 李晓辉宋立华白琰刘乃安付卫红黑永强韦娟
Owner XIDIAN UNIV
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