CN102711113A - Solution for China high-efficiency channel compatibility based on 802.11ac - Google Patents

Abstract

The invention provides a solution for China 120MHz channel division compatibility in ultra high-speed wireless local area network (WLAN) based on IEEE 802.11ac. Concrete definition and support for the China high-efficiency channel division are provided in the IEEE 802.11ac, wireless access point (AP) equipment in the 802.11ac standard supports two channel division modes which are used for supporting 802.11a/n or 802.11ac equipment; and a core processing unit is used for information processing and realizing a channel distribution algorithm. In an initial state, the AP equipment works in a China channel division mode, when an 802.11a/n station (STA) appears in a BSS (base station subsystem) coverage range established by the AP equipment, the AP equipment changes a corresponding channel to be compatible with the STA, an optimal channel selection method that all the available channels are taken as partially overlapped channels is adopted in channel selection, so that interference of the whole WLAN is minimum, and throughput is improved.

Description

A kind of based on the compatible solution of 802.11ac China efficient channel

Technical field

The present invention relates to the radio network technique field, relate in particular to the Wireless Network Applications field of 802.11ac ultrahigh speed WLAN, specifically be meant a kind of method of determining of dividing compatibility based on 802.11ac ultrahigh speed WLAN China efficient channel.

Background technology

Wireless local area network technology has obtained develop rapidly in the past few years, has become one of topmost Infrastructure platform of information-intensive society, and wireless lan (wlan) is the product that computer network and wireless communication technology combine; WLAN is as a kind of canonical form that realizes that WiMAX IP inserts; Owing to have mobile computing, the framework networking flexibility is quick, safeguards required expense than hanging down and advantages such as extensibility is good; It is increasingly extensive that these advantages make that WLAN uses, and just quickening its development.

First wlan standard 802.11 agreements were passed through in 1997, and its business mainly is limited to the visit of data, and working frequency range is 2.4GHz, 1999; IEEE 802.11 working groups have passed through two branches, and one is 802.11a, and another is 802.11b; Afterwards, in July, 2007, in conjunction with before all 8 of evolution augment part; Passed through IEEE 802.11-2007WLAN standard, carried out in 2009 the IEEE802.11-2007 standard augmented called after IEEE 802.11n-2009.

2008, to the supplementary standard of IEEE 802.11a, IEEE 802.11ac began to work out, and in WLAN of future generation, has defined the detailed method for using and the explanation of 20MHz and 40MHz channel distribution among the IEEE802.11n.IEEE 802.11ac has then added the definition of 80MHz and 160MHz on the basis of 802.11n.Like Fig. 8 and shown in Figure 9, defined the channel distribution of the 80MHz and the 160MHz of American market and American-European Japanese market in the standard respectively.Point out in the IEEE 802.11ac standard that the 80MHz channel is made up of two adjacent IEEE 40MHz channels, and two parts can not be overlapped.The 160MHz channel then is made up of two adjacent IEEE 80MHz channels, equally can not be overlapped.Wherein, but 160MHz is an options.

2010; The proposal of the Chinese frequency spectrum of being promoted mainly by Academy of Telecom Research of Ministry of Industry and Information of efficient support has obtained to pass through; But when this Chinese efficiently channel distribution has improved the availability of frequency spectrum; Also caused many problems, as shown in Figure 6, IEEE 802.11a/n and 802.11ac (U.S.) channel distribution and 802.11ac (China) channel distribution; The frequency deviation that will occur 7.5MHz on the centre frequency of its equipment work, this just caused the equipment of 802.11a/n and 802.11ac (U.S.) can't be related with access point (AP) with communicate by letter.Therefore on MAC, must propose a solution, solve the backward compatibility issues of new standard, guarantee the compossibility and the interoperability of WLAN.In addition, the compatibility with the 802.11ac equipment of American-European countries also needs to solve.

Summary of the invention

The objective of the invention is to solve IEEE 802.11ac China efficient channel and divide the compatibility issue that causes; Provide a kind of AP to switch through dynamic channel with multiple IEEE 802.11 standards of support; And the available channel on all 5GHz frequency ranges selected optimum channel as the channel of overlapping (referring to accompanying drawing 6) that is similar on the 2.4GHz frequency range; Realize disturbing minimum, throughput of system promotes the compatible method of accomplishing again to some extent.

In order to realize above-mentioned purpose; The invention provides the method for a kind of access device AP through dynamic frequency management solution compatibling problem, wherein, described 802.11ac standard radio access point apparatus AP; Said core processing unit, described compatible solution may further comprise the steps:

(1). described AP device power-up acquiescence mode of operation is a 120MHz China channel distribution pattern;

(2). described access device AP measures website (promptly having inserted the STA of BSS) request channel situation to one at least during operation and measures, and collects this information to core processing unit;

(3). need compatible website (STA) when getting into the BSS coverage, to insert BSS through related mode request; Request is divided into active request and passive request; Website should be notified access device AP in the beacon that active request is sent out, the channel that website (STA) is supported, information such as mode of operation;

(4). described access device AP delivers to core processing unit with information after receiving compatible STA related information, and core processing unit is according to the channel information of collecting; These information comprise channel operating position on every side, need related STA whether to need compatible operation etc., carry out analysis-by-synthesis; As the channel information that portion collects, these information comprise channel operating position on every side with all available channels (American-European channel on all 5GHz frequency ranges and Chinese channel mainly are that bandwidth is the channel of 20MHz); Need related STA whether to need compatible operation etc.; Carry out analysis-by-synthesis, all available channels (American-European channel on all 5GHz frequency ranges and Chinese channel mainly are that bandwidth is the channel of 20MHz) are handled as partly overlapping channel; Select optimum compatible channel, so that compatible website (STA) work;

Adopted the compatible solution based on the efficient channel division of 802.11ac ultrahigh speed WLAN China of this invention; Will bring following benefit: because described AP has the function of supporting multiple 802.11 standards, so the compatibility issue that the frequency deviation that is produced by channel distribution causes is resolved; Most importantly; On channel is selected, just make emphasis and handle, the feasible channel of selecting that is used for compatibility can make to reduce between AP and disturb, the raising throughput of system.

Description of drawings

In order to be illustrated more clearly in this technical scheme, will simply introduce the accompanying drawing of required use in the technical description below.

Fig. 1 is a kind of implementing procedure figure based on IEEE 802.11ac ultrahigh speed WLAN China channel distribution compatibility issue solution of the present invention.

Fig. 2 is the practical implementation flow chart of channel allocation algorithm

Fig. 3 inserts the situation embodiment of BSS for portable terminal STA.

Fig. 4 is a kind of concrete channel allocation design sketch.

Fig. 5 is Chinese efficient channel splitting scheme.

Fig. 6 is the definition of channel of overlapping.

Fig. 7 is the typical case of the figure of core processing unit foundation.

The channel distribution of Fig. 8 American market 80MHz and 160MHz.

The channel distribution of American-European Japanese market 80MHz of Fig. 9 and 160MHz.

Embodiment

To combine the accompanying drawing in the embodiment of the invention below, the technical scheme in the embodiment of the invention carried out clear, intactly describe.

As shown in Figure 1, be a kind of implementing procedure figure of the embodiment of the invention based on IEEE 802.11ac ultrahigh speed WLAN China channel distribution compatibility issue solution, said method comprises:

(1). described AP device power-up acquiescence mode of operation is a 120MHz China channel distribution pattern.Wherein, access device AP must be able to support Chinese channel distribution and two kinds of patterns of U.S.'s channel distribution.

(2). described access device AP measures website (promptly being associated with the STA of BSS) request channel situation to one at least during operation and measures; The channel information that this AP collects to measuring station point comprises each frequency range channel number, the channel number that power level, AP have taken; Employed channel number and AP institute beacon on (beacon) signal strength signal intensity etc.; And collect these information to core processing unit, core processing unit requires can stores information of channels, and can carry out the algorithm of certain complexity.

(3). need compatible website (STA) mode (mode through active request is sent beacon frame, and request inserts) notice access device AP through association when getting into the BSS coverage, the channel that website (STA) is supported, information such as mode of operation.These websites comprise the 802.11a website, 802.11n website, 802.11ac website (China) and 802.11ac website (American-European countries).

(4). described access device AP delivers to core processing unit with information after receiving compatible STA related information, and core processing unit is according to the channel information of collecting; The channel of BSS uses information promptly; And the information (channel that STA supported, information such as mode of operation) that needs related site STA to submit to, carry out analysis-by-synthesis; Set up a figure by core processing unit about access point AP, as shown in Figure 7.Access point AP is promptly represented on the summit among the figure, has line to represent that AP can detect the other side's operating state each other between the summit.

(5). as shown in Figure 3, in the middle of the relatively intensive environment of BSS, the AP equipment that can have many various criterions is in work.Suppose in wireless environment, to exist simultaneously 802.11n; 802.11ac Deng equipment, as can be seen from Figure 5, if with under the legal pattern (like the 802.1ac of American-European standard; 802.11n;) and China's Mode under 802.11ac channel distribution schemes synthesis get up to analyze, all 20MHz channels just are similar to the channel distribution mode under the 2.4GHz (802.11b/g) under the low rate mode, promptly channel exists overlapped.

(6). the effect of core processing unit is exactly that the available channel under all these 5GHz (20MHz channel) is integrated; Whole channels are regarded as meeting partly overlapping channel to be handled; Utilize the graph coloring method among Fig. 2 to carry out channel allocation; Select optimum compatible channel, so that compatible website (STA) work.

Shown in the practical implementation flow chart of Fig. 2 channel allocation algorithm, further comprise step based on the improvement algorithm of channel mapping colouring:

(1). under the low rate mode, after all AP have collected information needed in the wireless lan (wlan), in adjustment cycle, carry out painted, allocated channel.Concrete graph coloring method is; Accomplishing the maximum new startup AP of painted access point (AP) number around at first selecting carries out newly painted; Accomplish channel allocation; If the situation that exists number to equate, around then further selecting maximum new the accesss AP of interference signal intensity summation carry out painted, the completion channel allocation.

(2). under the high-rate mode, AP then utilizes the mode of contention-free period (CFP) and competing cycle (CP) poll to be used alternatingly through multichannel RTS/CTS mechanism.

Wherein, low rate mode comprises 20MHz, HT-20MHz, and HT-40MHz and 20MHz/40MHz mixed mode, high-rate mode comprises 80MHz, the 120MHz pattern.

Shown in the situation embodiment that Fig. 3 mobile site STA inserts BSS, STA can send out association request (Association request) when inserting BSS, requires to carry out relatedly with AP, and at this moment, AP just can adjust channel according to the information of association request, the distribution suitable channel.

Fig. 4 has provided a kind of embodiment of concrete channel allocation.Comprised the BSS under the Chinese channel distribution pattern among the figure, and at the BSS that carries out under the compatibility mode, the channel between BSS is the channel that can overlap.Proved that this method for channel allocation can reduce interference, improved system throughput.

Fig. 5 has then provided a kind of concrete mode that Chinese efficient channel is divided; As can be seen from the figure, Chinese efficient channel division can comprise the non-overlapped channel of 6 20MHz, based on these 6 20MHz channels; Can be divided into 3 40MHz channels again, 1 80MHz channel and 1 120MHz channel.

Fig. 6 has then provided the definition of the channel of overlapping.Among the figure, the bandwidth of each channel is 22MHz, and we can find out to have only C1 from figure, C6, and three channels of C11 (redness marks) are non-overlapped channel, these three channels also are that present WLAN is used three channels the most widely.Other like C2 and C1, C1 and C3 etc. is called the channel of overlapping.

Fig. 7 then is the typical case by the figure of core processing unit foundation.In the wireless local area network (WLAN) system, basic service set (BSS) or extended service set (ESS) system can abstractly be a non-directed graph G=(V, coloring problem E).Interference figure G is made up of two parts, and V is a vertex set among the figure, represents the access point (AP) in the wireless local area network (WLAN) system, and E is the limit collection of presentation graphs then, has the limit between two summits, has the overlapping region with regard to the coverage that two access points (AP) are described.Concrete color rendering intent is following:

1. at first all AP can set up a non-directed graph G

2. it is painted to select the maximum AP of surrounding edge number at first to carry out, i.e. channel allocation

3. if the AP that exists the limit number to equate, it is painted to disturb a maximum AP to carry out around then selecting,

4. upgrade figure, return step 2, till all AP accomplish channel allocation.

Claims (2)

1. backwards compatibility way to solve the problem based on the relevant Chinese channel distribution pattern of 802.11ac ultrahigh speed wireless lan (wlan) is characterized in that described compatible solution may further comprise the steps:

(1) acquiescence of the wireless access point AP device power-up in 802.11ac standard mode of operation is a 120MHz China channel distribution pattern; Wherein, AP must be able to support Chinese channel distribution and two kinds of patterns of U.S.'s channel distribution;

(2) said AP measures the measurement of website (STA) request channel situation to one during operation at least; The channel information that this AP collects to measuring station point comprises each frequency range channel number, the channel number that power level, AP have taken; Employed channel number and AP institute beacon on (beacon) signal strength signal intensity; And collect said channel information to core processing unit, core processing unit requires can stores information of channels, and can carry out the algorithm of certain complexity;

(3) need compatible website (STA) when getting into the BSS coverage, notify channel, the mode of operation information of its support of AP through the mode of association; The said website of compatibility that needs comprises the 802.11a website, 802.11n website, 802.11ac website (China) and 802.11ac website (American-European countries);

(4) after AP receives and needs compatible STA related information; Information is delivered to core processing unit; Core processing unit is handled all available channels according to the channel information of collecting as partly overlapping channel, utilize the graph coloring method to carry out channel allocation; Select optimum compatible channel, so that compatible website (STA) work.

2. the method for claim 1 is characterized in that, said graph coloring method under low rate mode, after all AP have collected information needed in the wireless lan (wlan), in adjustment cycle, carry out painted, allocated channel; Concrete graph coloring method is; Accomplishing the maximum new startup AP of painted access point (AP) number around at first selecting carries out newly painted; Accomplish channel allocation; If the situation that exists number to equate, around then further selecting maximum new the accesss AP of interference signal intensity summation carry out painted, the completion channel allocation;

Under the high-rate mode, AP then utilizes the mode of contention-free period (CFP) and competing cycle (CP) poll to be used alternatingly through multichannel RTS/CTS mechanism;

Wherein, low rate mode comprises 20MHz, HT-20MHz, and HT-40MHz and 20MHz/40MHz mixed mode, high-rate mode comprises 80MHz, the 120MHz pattern.

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