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Media access control method and system of nodes in full duplex wireless local area network

A medium access control, wireless local area network technology, applied in transmission system, wireless communication, duplex signal operation and other directions, can solve the problem of FD-MAC throughput performance not reaching, duplex opportunity FD-MAC cannot be used, ignoring duplex opportunity, etc. question

Active Publication Date: 2016-06-15
INST OF COMPUTING TECH CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

FD-MAC mainly focuses on how to enable a pair of nodes with duplex opportunities to establish duplex communication, but completely neglects to seize duplex opportunities
Therefore, it may appear that there are duplex opportunities in the system and FD-MAC cannot take advantage of them
Therefore, the throughput performance of FD-MAC did not meet our expectations of applying FDWLAN
Moreover, due to the simple application of CSMA / CA, FD-MAC also has the problem of poor fairness

Method used

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  • Media access control method and system of nodes in full duplex wireless local area network
  • Media access control method and system of nodes in full duplex wireless local area network
  • Media access control method and system of nodes in full duplex wireless local area network

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0097] Embodiment 1: The AP has the advantage of accessing the medium, and the AP preferentially accesses the medium

[0098] At the beginning, the system state is as follows Figure 8 As shown, the AP has a data packet sent to the Client 1 and Client 2 .

[0099] 1.AP prepares to send a target is Client 1 The data packet, generate backoff count (backoffcount), backoffcount=x;

[0100] 2. The AP checks the transmission intent table and finds that the Client 1 If there is a transmission intention, the AP sets the backoffcount to 0;

[0101] 3.AP sends data packet immediately, because Client 1 There are also data packets sent to the AP, and the data packets sent by the AP can lead to a duplex data transmission, (because the Client 1 After sending the data packet, there is no transmission intention to the AP, and the Client will set "moredata" to 0);

[0102] 4. After the data transmission is completed, the AP will update the transmission intention table, and then the sys...

Embodiment 2

[0103] Embodiment 2: The AP does not have the advantage of accessing the medium, and the Client accesses the medium before the AP

[0104] At the beginning, the system state is as follows Figure 10 As shown, the AP has a data packet sent to the Client 1 and Client 2 .

[0105] 1.AP prepares to send a target is Client 2 data packets, generate backoffcount, backoffcount=x;

[0106] 2. The AP checks the transmission intent table and finds that the Client 2 There is no transmission intention, and the AP does not change the backoffcount;

[0107] 3.AP received from Client 1 data packets, AP and Client establish duplex communication, (due to Client 1 After sending the data packet, there is still a transmission intention to the AP, and the Client will set "moredata" to 1);

[0108] 4. After the data transmission is completed, the AP will update the transmission intention table, and then the system status is as follows Figure 10 shown.

Embodiment 3

[0109] Embodiment 3: AP uses POLL to inquire about the client's transmission intention

[0110] The system state at the beginning of the transfer is as follows Figure 12 As shown, Client 1 and Client 2 There are a large number of data packets sent to the AP, and the AP only sends them to the Client 1 There is a data packet, and one constructed by the AP is sent to the Client 1 POLL (with POLL 1 Indicates) has reached the head of the team.

[0111] 1. AP prepares to send POLL 1 ;

[0112] 2. AP sends POLL immediately 1 , due to Client 1 A data packet is sent to the AP, and the POLL sent by the AP can prompt the Client to 1 Initiate a transfer (because the Client 1 After sending the data packet, there is still a transmission intention to the AP, and the Client will set "moredata" to 1);

[0113] 3. After the data transmission is completed, the AP will update the transmission intent table;

[0114] 4. After AP sends POLL, it finds that none of the targets is Client b...

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PUM

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Abstract

The invention discloses a media access control method and system of nodes in a full duplex wireless local area network. The method comprises following steps of step 1, building full duplex communication by nodes through an asynchronous mode, wherein the nodes comprises access nodes and user nodes; if a node B in the nodes sends a data packet P to a node A, after the node A receives the head of the data packet P, detecting whether there is a data packet S in the node A needing to be sent to the node B; if so, sending the data packet S to the node B by the node A, thus building the duplex communication; and vice versa; step 2, building a transmission purpose graph for each node; storing the transmission purpose graph of each node; before the nodes access carry out the media access, firstly detecting whether the transmission purpose graphs of the opposite end nodes have transmission purposes; if so, accessing channels by the nodes preferentially, thus building the duplex communication with the opposite end nodes. According to the method and the system provided by the invention, the nodes can grasp more duplex communication opportunities to build the duplex communication; and therefore, the throughputs of the nodes are effectively improved.

Description

technical field [0001] The invention relates to the technical field of wireless communication, in particular to a medium access control method and system for nodes in a full-duplex wireless local area network. Background technique [0002] A wireless local area network (Wireless Local Area Network, WLAN) is a commonly used wireless network, and throughput performance is a key performance indicator. The emerging physical layer technology "simultaneous same frequency wireless full duplex" (InbandFullDuplexwireless, FD), because it can double the physical layer capacity of wireless local area network, will be widely used in wireless local area network in the future. Both the access point (AccessPoint, AP) and the user node (Client) support a "simultaneous same-frequency wireless full-duplex" wireless local area network, which is called a full-duplex wireless local area network (FDWLAN). FDWLAN usually consists of an AP and multiple clients. [0003] In order to bring out the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L29/06H04L5/14H04W28/06H04W28/14H04W74/08
CPCH04L5/14H04L63/10H04W28/06H04W28/14H04W74/0816H04W74/085H04W84/12
Inventor 段荣昌张瀚文张玉军李忠诚
Owner INST OF COMPUTING TECH CHINESE ACAD OF SCI