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Competition and allocation combined MAC access method based on AP control

An access method and phase allocation technology, applied in the field of MAC access, can solve the problems of no distinction mechanism, reduced throughput, wasting time, etc., and achieve the effect of solving the problem of hidden stations, ensuring fairness, and solving the problems of exposed stations

Inactive Publication Date: 2015-01-28
CHINA UNIV OF GEOSCIENCES (WUHAN)
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Problems solved by technology

[0005] Secondly, the DCF model also has inherent defects
The DCF mode is more effective when the network load is light, but as the load conflict increases, the backoff execution process wastes a lot of time, the throughput will gradually decrease, and the effective end-to-end delay cannot be guaranteed.
At the same time, in the DCF mode, all stations in a BSS compete for channels with the same priority, so there is no differentiation mechanism to ensure the service of high-priority stations

Method used

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  • Competition and allocation combined MAC access method based on AP control
  • Competition and allocation combined MAC access method based on AP control
  • Competition and allocation combined MAC access method based on AP control

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Embodiment Construction

[0029] The present invention will be further described below in conjunction with drawings and embodiments.

[0030] The present invention provides a MAC access method based on AP-controlled contention and allocation. In a BSS, the AP is used to control the data transmission sequence of the stations, and a working cycle is divided into a contention period T1 and an allocation period T2. Two time periods, T1 is the default value;

[0031] (1) The competition period T1 carries out the following steps:

[0032] (1-1) At the beginning of the T1 period, the AP sends a broadcast message NEWS1 to inform all stations in the BSS to request to send data, and at the same time clears the sending station sequence table stored in the AP, and at the same time sets the T1 timer for determining the duration of T1; The content of the sending station sequence table is shown in Table 1:

[0033]

[0034] Table 1 Sequence list of sending stations

[0035] (1-2) After receiving NEWS1, all stat...

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Abstract

The invention provides a competition and allocation combined MAC access method based on AP control. The data sending sequence of sites is controlled through an AP in a BSS, one working period is divided into a competition time frame T1 and an allocation time frame T2, a site sends a request to the AP in the process of the competition time frame T1, and the AP allocates the data sending time of the sites in the process of the allocation time frame T2. According to the method, the AP is introduced for controlling data sent by the mobile sites, it can be guaranteed that no interference exists between different times of communication, and the problems about a WLAN hidden station and a WLAN exposed station can be solved. Meanwhile, the sending application of mobile terminals can only be differentiated according to the reaching sequence and cannot be differentiated according to priorities, and therefore the fairness of the mobile terminals is guaranteed.

Description

technical field [0001] The invention relates to a MAC access method combining contention and allocation based on AP control, which belongs to the field of wireless communication. Background technique [0002] For densely populated business districts, exhibition halls, and airports, where the number of wireless access points is limited and many people use them, the current IEEE 802.11 access mechanism has a very high collision probability, which greatly restricts the WLAN Use efficiency. [0003] The CSMA / CA protocol proposes many effective methods for wireless access, but there are still some problems. The existing problems are mainly divided into two aspects: [0004] First, the backoff algorithm adopted by the CSMA / CA protocol is the BEB algorithm. The BEB algorithm is simple to implement, but its adjustment to the backoff time is too drastic: when a collision is detected, the backoff time will increase exponentially in binary; and after a successful transmission, the b...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04W74/02H04W74/08
CPCH04W74/02H04W74/0816H04W74/0825
Inventor 黄鹰郝宝亮
Owner CHINA UNIV OF GEOSCIENCES (WUHAN)
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