Method for adding time division mechanism in CSMA/CA by the aid of CTS
A technology of time slices and time cycles, applied in access restriction, network traffic/resource management, electrical components, etc., can solve problems such as difficult 802.11 terminal popularization, information collision, system transmission efficiency decline, etc., and achieve the effect of improving communication capabilities
Inactive Publication Date: 2011-03-30
CHONGQING SICMICRO ELECTRONICS
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Problems solved by technology
[0003] However, if the 802.11 technology is used in a wired network, especially a cable TV network, as a broadband access system, there will be hidden sites and information collisions because the terminals cannot detect each other, resulting in a significant drop in system transmission efficiency
If the CSMA / CA mechanism is modified, hidden stations can be effectively eliminated, but the link layer protocol in the terminal equipment must be changed, which is difficult to popularize among a large number of 802.11 terminals
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[0025] In order to clearly illustrate the solutions in the present invention, preferred embodiments are given below and detailed descriptions are given in conjunction with the accompanying drawings.
[0026] In order to overcome the problem of system congestion caused by hidden stations in air access or coaxial cable access, the method of the present invention adds a time-division mechanism through CTS during the access process between the terminal and the AP. The specific steps can be found in figure 1 , the embodiment includes the following steps:
[0027] Step 1: When the AP starts, first set the time period length of the Superframe, for example, 20ms. The maximum number of stations is determined according to the system performance, and the minimum time slice length obtained by each terminal is determined by the time length of the Superframe and the maximum number of terminals.
[0028] Step 2: Calculate the number M of terminals currently connected to the system;
[0029...
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The invention discloses a method for adding time division mechanism in CSMA / CA by the aid of CTS, comprising: access point AP distributes time slices of each terminal according to preset time cycle and current terminal number, in each time slice, AP broadcasts terminal address permitting communication and time slice sequence number to each terminal by CTS data frame, and carries out data-transmission with the current terminal permitting communication; when a new adding terminal is connected with the AP device, the new adding terminal occupies the communicating time slice of the current terminal, when current time cycle ends, AP recalculates number of the current terminals. The method of the invention can avoids congestion to system because of exist of hidden station when the terminal accesses AP by wireless or coaxial cable manners; especially for the access system based on coaxial cable network, congestion of access system will not occur even if distance of each terminal is long and hidden station is generated, thereby effectively raising communication capability of the access network.
Description
technical field [0001] The present invention relates to time-division communication technology, in particular to a method for adding time-division mechanism in CSMA / CA by means of CTS. Background technique [0002] As the 802.11 protocol is more and more used in computers and mobile phones, in many places, the user operation terminal Station can be connected to the network by connecting to the 802.11 access point AP. When more than two terminals access the AP, the AP uses the CSMA / CA access mechanism to control terminal access. In a wireless network, since each terminal can detect each other and there is no hidden station, the possibility of information collision is relatively small. [0003] However, if the 802.11 technology is used in a wired network, especially a cable TV network, as a broadband access system, there will be hidden sites and information collisions because the terminals cannot detect each other, resulting in a significant drop in system transmission effici...
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IPC IPC(8): H04W48/06H04W28/02H04W74/08
Inventor 钟洋贾治安边晓春
Owner CHONGQING SICMICRO ELECTRONICS