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Link switching method

A link switching and all-channel technology, applied in the field of link switching, can solve problems such as inability to establish an accurate channel selection list, switching failure, network complexity, etc., to avoid repeated switching, reduce delay, and ensure compatibility Effect

Active Publication Date: 2007-05-23
LENOVO (BEIJING) LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The algorithm maintains a dynamic scan list through the sensor method, which is also complex in the network and increases the number of devices
And for fast-moving nodes, an accurate channel selection list cannot be established before switching, which will cause switching failure

Method used

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Experimental program
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no. 1 approach

[0037] As shown in FIG. 2 , it is a flow chart of the link switching method according to the first embodiment of the present invention.

[0038] The link switching method shown in Figure 2 includes steps:

[0039] Selecting a candidate AP from the current candidate AP set generated by full channel scanning;

[0040] Use the selected candidate AP for association and authentication,

[0041] i) If the association and authentication are successful, complete the link switch;

[0042] ii) If the association and authentication are unsuccessful, it is judged whether all APs in the candidate AP set are selected.

[0043] If not, the above steps are repeated, and if all the APs in the candidate AP set are selected, the link switching ends.

[0044] In the present invention, in order to realize fast link switching, before performing link switching, the result of periodic scanning of wireless network equipment is used to generate a candidate AP set. Therefore, when performing link swi...

no. 2 approach

[0063] As shown in Figure 4, in order to better ensure the successful link switching of each communication service, after the candidate AP set is generated in Figure 3, a dynamic scanning list is further maintained for performing selection after association and authentication failures Sexual scanning process. The specific generation method of the dynamic scanning list is as follows: the scanned channel (not the current channel) is added to the dynamic scanning list, and then the channel which cannot overlap with the current channel is added to the dynamic scanning list.

[0064] As shown in Figure 5, when performing link switching, the wireless network device first performs association and authentication according to the APs in the candidate AP set, and after the authentication and association fails, it performs channel scanning in the channels listed in the dynamic scanning list, Then select 1) the AP with the best signal quality from the channel scan results; 2) the AP with ...

no. 3 approach

[0066] In order to better reflect the channel condition, the delay-sensitive communication service and the delay-insensitive communication service may be processed differently here. That is, for communication services that are sensitive to delay, link switching can be performed in the manners of the above-mentioned first embodiment and second embodiment, while for communication services that are not sensitive to delay, the link switching can be performed according to scan first and then associate and authenticate way.

[0067] Specifically, in the process of communication services that are not sensitive to delay, due to the long link switching time, full channel scanning can be performed during the link switching process to obtain the signal strength and signal strength of each channel. Quality, and use the method of generating candidate AP sets in the above-mentioned first embodiment to generate a corresponding candidate AP set, and use this candidate AP set as the latest can...

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Abstract

The invention relates to a chain switch method, which comprises: 1, selecting one ready AP from present ready AP group generated by full-channel scanning; 2, using selected AP to relate and identify; if they are successful, executing step 3, or else, repeating steps 1 and 2; if all AP are selected and the relate and identify are failed, ending; 3, completing the chain switch. The invention can improve switch speed.

Description

technical field [0001] The invention relates to a link switching method, in particular to a link switching method which reduces switching delay and improves link switching speed. Background technique [0002] The current optimization algorithm for fast link switching mainly focuses on how to reduce the scan time and authentication time. The channel scanning time during the channel switching process accounts for more than 90% of the total switching delay, while the sum of the delays spent on authentication and closing accounts for a very low proportion of the total delay, indicating that the switching delay is affected during the switching process. The main factor is the way the channels are scanned. [0003] Ishwar Ramani, Stefan Savage and others proposed a synchronous scanning algorithm in the paper "Syncscan: Practical FastHandoff for 802.11 Infrastructure Networks". This algorithm advances the scanning process to the normal communication process. When the handover is i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04Q7/38H04W36/08H04W36/30
Inventor 徐晓飞单文英杨仁忠吴功伟
Owner LENOVO (BEIJING) LTD
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