Time frequency two-dimensional hybrid MAC layer access method

An access method, time-frequency two-dimensional technology, applied in the field of communication, can solve problems such as high collision probability, low MAC layer efficiency, and limited system throughput, so as to reduce collision probability, increase random access opportunities, and improve Effects on System Throughput

Inactive Publication Date: 2011-05-25
BEIJING UNIV OF POSTS & TELECOMM
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  • Claims
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Problems solved by technology

Due to the high collision probability of the existing simple CSMA / CA mechanism MAC layer protocol, especially in the case of a large number of STAs and a large amount of data, the impact of collisions reduces the efficiency of the MAC layer and limits the entire system. Throughput

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  • Time frequency two-dimensional hybrid MAC layer access method
  • Time frequency two-dimensional hybrid MAC layer access method
  • Time frequency two-dimensional hybrid MAC layer access method

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Embodiment Construction

[0030] The specific implementation manners of the present invention will be described in further detail below in conjunction with the accompanying drawings and examples. The following examples are used to illustrate the present invention, but are not intended to limit the scope of the present invention.

[0031] The design idea of ​​the present invention is: in the frequency domain dimension, use OFDMA technology for access: a group of subcarriers forms a subchannel, the entire bandwidth is divided into multiple different subchannels, and different users occupy different subchannels. The sub-channels are orthogonal to each other without interference. In the time dimension, the use of CSMA / CA technology enables different users (hereinafter referred to as stations) to compete to reserve different time slots, and each user occupies different time slots to send data, avoiding interference. Thus, two-dimensional access in the time domain and frequency domain is realized by combini...

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Abstract

The invention discloses a time frequency two-dimensional hybrid media access control (MAC) layer access method. In the two-dimensional direction of a frequency domain and a time domain, multiple users can compete with an available resource together, wherein the available resource comprises each sub channel and different time slots. Conflict is avoided by adopting a withdrawal mechanism, and the users are accessed to a wireless channel to transmit data by competing with the available resource and combining a reservation mechanism. The frequency resource and the time resource are simultaneously utilized in the method, and the competition and the reservation mechanism are combined, so that the utilization rate of the system channel is improved; and the conflict is avoided, so that the throughput of the whole system is effectively improved.

Description

technical field [0001] The present invention relates to the field of communication technology, in particular to a time-frequency two-dimensional hybrid media access control (Media Access Control, MAC) layer access method based on CSMA / CA and OFDMA. Background technique [0002] With the rapid development of mobile communication technology, Internet technology and computer technology, mobile communication is no longer limited to pure voice communication, and high data rate services have attracted more and more attention. In the future, mobile communication users will continue to improve their expectations in terms of types and applications of the communication services that can be realized. Wireless local area network is the product of the combination of computer network and wireless communication technology. As a typical form of broadband wireless IP access, wireless local area network has the advantages of mobile computing, flexible and fast networking, low maintenance cos...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04W74/08
Inventor 康桂霞张平王晶
Owner BEIJING UNIV OF POSTS & TELECOMM
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