Wireless local area network (WLAN) switching method and system

A switching system and terminal technology, applied in network traffic/resource management, access restrictions, electrical components, etc., can solve problems such as heavy air interface load, unbalanced load between APs, and poor uplink quality of terminals, and achieve a balanced AP load, improve service quality, and avoid adverse effects

Active Publication Date: 2011-04-06
CHINA TELECOM CORP LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] When the terminal scans that the downlink SNR and downlink RSSI of the neighbor AP are very good, the uplink quality of the terminal may not be very good, that is, the uplink and downlink are asymmetrical, but the common terminal still selects the neighbor AP according to the best downlink quality, resulting in handover. Improved Terminal Service Quality
In addition, the optimal AP considered by the terminal may have a heavy load or the air interface load of the frequency point where it is located, while the current serving AP may have a lighter load. Therefore, after the handover, the load between APs will be unbalanced, and it cannot Improve Terminal Service Quality

Method used

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  • Wireless local area network (WLAN) switching method and system
  • Wireless local area network (WLAN) switching method and system
  • Wireless local area network (WLAN) switching method and system

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Embodiment Construction

[0022] The technical solutions of the present invention will be described in further detail below with reference to the accompanying drawings and embodiments. figure 1 For the WLAN handover method of the present invention, comprise the following steps:

[0023] In step 101, the quality of the uplink from the terminal to the AP and the quality of the downlink from the AP to the terminal are obtained, including the current serving AP and neighboring APs.

[0024] In order to obtain the quality of the uplink, it is necessary to add a private information element in the standard Probe Response frame: Up Link Quality information element, which indicates the quality of the uplink. The Element Id defined by the protocol is 221 for non-standard extension, that is, based on the standard extension ( In order to be compatible with the existing network), but not the same as the existing technology. Contains two pieces of information: SNR, Signal-to-Noise Ratio; RSSI, Received Signal Stren...

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Abstract

The invention provides a wireless local area network (WLAN) switching method and system. The method comprises the following steps: acquiring uplink quality from a terminal to an access point (AP), and acquiring downlink quality from the AP to the terminal; acquiring the load of the AP; taking the minimum value of each pair of uplink quality and downlink quality for expressing the link quality of the terminal and the AP as MIN(R); selecting each AP of which the MIN(R) is greater than or equal to T in all scanned APs to form an AP set, wherein T is a load balance switching threshold, and the unit of T is dB; and sequentially arranging the APs in the AP set according to the magnitude of the load of each AP, and taking the AP with a lightest load as a switching target for switching. The invention avoids the adverse effect on terminal switching caused by asymmetrical uplink quality and downlink quality, and can enable the terminal to always switch the AP with the lightest load to improve the service quality of the terminal.

Description

technical field [0001] The invention relates to the field of WLAN application technology, in particular to a WLAN switching method and system. Background technique [0002] With the development of WLAN networks, the demand for WLAN wide-area coverage is increasing, and further requirements are placed on the technology of seamless handover of terminals. However, when the current terminal switches, it will at most consider the downlink SNR (Signal to noise ratio, signal-to-noise ratio), downlink RSSI (Received Signal Strength Indicator, received signal strength indicator) and BER of the neighboring AP (Access Point, access point). , PER factors, and compare the downlink SNR and downlink RSSI factors of the current serving AP, so as to select the best AP in the neighbor list as the handover target. [0003] When the terminal scans that the downlink SNR and downlink RSSI of the neighbor AP are very good, the uplink quality of the terminal may not be very good, that is, the upli...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04W28/08H04W36/22H04W48/16
Inventor 李莉徐旭高波李浩琳
Owner CHINA TELECOM CORP LTD
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