CN100481793C - Wireless device and wireless channel measurement controller - Google Patents

Abstract

In measurement of wireless channels in an IEEE 802.11 wireless local area network (WLAN), in the case of multi-channel measurement as in North America in which eight wireless channels Ch 1 through Ch 8 are available, channel measurement according to a predetermined algorithm is made in which odd-numbered channels Ch 1 , Ch 3 , Ch 5 and Ch 7 are first measured, and if radio interference occurs in channel Ch 5 , channels Ch 4 and Ch 6 adjacent to channel Ch 5 are measured. This shortens the measurement time that conventionally corresponds to measurement of the eight channels to the time of six channels, i.e., the sum of the measurement time for the odd-numbered channels and that for the channels adjacent to the interference-occurring channel.

Description

Wireless device and wireless channel measurement controller

The cross reference of related application

The application requires the priority of the patent application No.2005-324074 that submits in Japan in the patent application No.2004-365829 that submitted in Japan on December 17th, 2004 and on November 8th, 2005, and its full content is herein incorporated for your guidance.

Technical field

The application relates to a kind of wireless device and wireless channel measurement controller, and more specifically, relates to the technology relevant with channel selecting method, and this method is used for the wireless channel measurement of IEEE802.11 wireless lan (wlan).

Background technology

Wireless lan (wlan) consists essentially of base station (access point; AP) and called tation (stand; STA) (base station and station also all are called as wireless terminal).The basic service set (BSS) that website within the same wireless coverage and access point are just usually said.When these BSS are placed close to each otherly, and when operating in same channel, this also is known as overlapping BSS, because the contention that may occur between overlapping BSS, and is difficult to the quality of service that provides required.For fear of such problem, if channel disturbance constantly takes place in the middle of one or more stations in particular B SS and/or the access point lastingly, this access point is dynamically selected new Radio Link so, to keep the operation of BSS.

In available wireless channel, for the channel of dynamically selecting to be used between a plurality of stations within the BSS coverage and access point, to communicate, this access point judges at first whether the channel that is used by a plurality of wireless terminals is the channel that is fit in current communication, that is to say, whether need to select the better new channel of communications status, ask the subclass at these stations to carry out the channel signal quality measurement then.In order to realize this process, determine one group of channel that can be used for these stations.By using determined this group available channel, whether detect the signal that has received the channel identical from neighbor bss S, and whether detection there is the radio interference from neighbor bss S in arbitrary channel of this group available channel with the channel that comprises this group available channel.The communications status of these available channels is measured at these stations, and to Packet Error Ratio (PER) and the received signal intensity index (RSSI) of access point report by all channels of these stations measurements.Equally also measure to disturb rank, just the interference rank that in preset time, occurs owing to the influence of any other wireless device.This interference rank is based on when this BSS measuring-signal and when access point is reported its measurement result, the shortage that receives from the signal of other BSS.Based on received signal intensity index, Packet Error Ratio and interference class information, come selector should new channel that access point settle the standard thereafter.

Fig. 2 shows the part of the structure of conventional wireless communication system (wireless device).The wireless communication system 20 of Fig. 2 comprises: transmission/receiving unit 23 has the channel measurement part 22 that is used to carry out channel measurement; And host machine part 21, be used to receive the measurement result that comes from channel measurement part 22.By convention, the measurement of wireless channel is undertaken by the wireless communication system with this channel measurement part 22.

As correlation technique, US2002/0060995A has described and has been used for measured channel to determine the method for new channel.

Equally, IEEE802.11h has examined and has measured wireless channel state dynamically to change the technology of channel.

Yet, although the measurement to wireless channel is discussed in about the document of above-mentioned channel measurement technology, and not mentioned specific method of measurement (algorithm).

Figure 13 is the view that the used channel of in December, 2004 Japan is shown, and Figure 14 is the view that the used channel of the U.S. is shown.As shown in figure 13, the number of Japanese used channel is four (5150 to 5250[MHz]), and as shown in figure 14, a plurality of channels (eight channels; 5150 to 5350[MHz]) be operable in the North America.(notice that from May, 2005, eight used channels of North America equally also can use in Japan.) when the number of available wireless channels is very big, if alternately is measured these wireless channels, so will be very long up to measure the required time interval of same channel next time, this causes increasing the problem of whole Measuring Time.

Summary of the invention

The purpose of this invention is to provide a kind of specific measurement system, be used to shorten the Measuring Time of available channel.

Specifically, the present invention relates to a kind of wireless device, comprising: the channel measurement part, have the function of measuring user mode, this user mode is represented the advantage or the inferior position of the communications status of two or more wireless channels; And measured channel determining section, be used for the definite wireless channel that will measure, wherein this measured channel determining section has pre-defined algorithm, is used at the state of measuring all available wireless channels and only measures between the state of all some channels of available wireless channels and carry out effective choice.

Wireless device of the present invention is to have the wireless device of measuring the user mode function, and this user mode is represented the advantage or the inferior position of the communications status of two or more wireless channels, and this equipment comprises: the channel measurement part is used to measure the user mode of wireless device; And measured channel determining section, be used for the definite wireless channel that will measure, and will measure instruction and send to the channel measurement part, wherein this measured channel determining section is according to pre-defined algorithm, first state of some channels and measure between second state of all available wireless channels and select in only measuring all available wireless channels, and will measure instruction and send to the channel measurement part.

Wireless channel measurement controller of the present invention is above-mentioned wireless device, wherein this wireless device is formed wireless network with individual or more other wireless terminals, and each other wireless terminal all has the channel measurement part of the user mode that is used to measure wireless channel.

In an embodiment of wireless device of the present invention, if detect radio interference in the measurement of the wireless channel of current use, then the measured channel determining section is selected second state, and will measure instruction and send to the channel measurement part.

In another embodiment of wireless device of the present invention, the measured channel determining section is selected first state according to pre-defined algorithm, only measure the wireless channel of odd-numbered in all available wireless channels or even-numbered in this first state, and will measure instruction and send to the channel measurement part.

In the another embodiment of wireless device of the present invention, the measured channel determining section is selected first state according to pre-defined algorithm, measure in all available wireless channels in this first state and comprise the odd-numbered of presently used wireless channel or the channel of even-numbered, and will measure instruction and send to the channel measurement part, if and in odd-numbered or even-numbered channel any one detects radio interference, then select first state, measure in this first state and detect the adjacent channel of channel of interference, and will measure to instruct and send to the channel measurement part.

In the another embodiment of wireless device of the present invention, this wireless device is a wireless channel measurement controller of forming wireless network with one or more other wireless terminals, each other wireless terminal all has the channel measurement part, be used to measure the user mode of wireless channel, and the measured channel determining section of this wireless channel measurement controller is according to pre-defined algorithm, between the third state and four condition, select, and will measure instruction and send to the channel measurement part of this wireless channel measurement controller, and in the channel measurement of other wireless terminals part at least one.In this third state, by at least two some channels of only measuring in all available wireless channels in the channel measurement part of the channel measurement of this wireless channel measurement controller part and other wireless terminals, in this four condition, measure all available wireless channels by any two in the channel measurement part of the channel measurement of this wireless channel measurement controller part and other wireless terminals.

Replacedly, wireless device of the present invention is to have the wireless device of measuring the user mode function, this user mode is represented the advantage or the inferior position of the communications status of two or more wireless channels, and this equipment comprises: the channel measurement part is used to measure the user mode of wireless device; And measured channel determining section, be used for the definite wireless channel that will measure, and will measure instruction and send to the channel measurement part, wherein this measured channel determining section is according to pre-defined algorithm, in the third state and four condition, select, and will measure at least one in partly of channel measurement that instruction sends to this wireless device self and other wireless terminals.In this third state, by at least two some channels of only measuring in all available wireless channels in the channel measurement part of this channel measurement part and one or more other wireless terminals, in this four condition, measure all available wireless channels by any two in the channel measurement part of this channel measurement part and other wireless terminals.

In an embodiment of wireless device of the present invention, the measured channel determining section if other wireless terminals become and are not connected to wireless network, then is converted to first or second state according to pre-defined algorithm; If other wireless terminals become and are connected to wireless network, then be converted to the 3rd or four condition.

In another embodiment of wireless device of the present invention, the measured channel determining section will be measured the channel measurement part that instruction sends to other wireless terminals that belong to same wireless network, to measure different wireless channels.

In the another embodiment of wireless device of the present invention, if in any wireless channel of partly measuring by channel measurement, detect radio interference, then the measured channel determining section will be measured at least one in the channel measurement part that instruction sends to this wireless channel measurement controller and other wireless terminals, to measure all available wireless channels.

In the another embodiment of wireless device of the present invention, if in by any wireless channel that other wireless terminals are measured arbitrarily, detect radio interference, and the adjacent channel of wireless channel of interference is being measured and be detected to other wireless terminals of neither one, then this measured channel determining section will be measured instruction and send to other wireless terminals of measuring the wireless channel that is detected interference, to measure this adjacent channel.

In the another embodiment of wireless device of the present invention, the measured channel determining section is selected second state according to pre-defined algorithm, the second-best wireless channel of user mode in all wireless channels is stored as candidate's alternate channel of current channel of communicating by letter, this second-best wireless channel is determined according to the result of the measurement of carrying out for all wireless channels in response to the measurement instruction that sends to the channel measurement part from the measured channel determining section, select only to measure first state of current channel of communicating by letter and candidate's alternate channel according to pre-defined algorithm, and will measure to instruct and send to the channel measurement part.

In the another embodiment of wireless device of the present invention, the measured channel determining section is selected four condition according to pre-defined algorithm, the second-best wireless channel of user mode in all wireless channels is stored as candidate's alternate channel of current channel of communicating by letter, this second-best wireless channel is determined according to the result of the measurement of carrying out for all wireless channels in response to the measurement instruction that sends to the channel measurement part from the measured channel determining section, select only to measure the third state of current channel of communicating by letter and candidate's alternate channel according to pre-defined algorithm, and will measure to instruct and send to the channel measurement part.

In the another embodiment of wireless device of the present invention, if in candidate's alternate channel, detect radio interference according to pre-defined algorithm, then the measured channel determining section is selected second state, and will measure the instruction send to the channel measurement part, measure all available wireless channels with the indicating channel measure portion.

In the another embodiment of wireless device of the present invention, if in candidate's alternate channel, detect radio interference according to pre-defined algorithm, then the measured channel determining section is selected four condition, and will measure the instruction send to the channel measurement part, measure all available wireless channels with the indicating channel measure portion.

In the another embodiment of wireless device of the present invention, the measured channel determining section is periodically selected second state according to pre-defined algorithm, and will measure the instruction send to the channel measurement part, be updated periodically this candidate's alternate channel thus.

In the another embodiment of wireless device of the present invention, the measured channel determining section is periodically selected four condition according to pre-defined algorithm, and will measure the instruction send to the channel measurement part, be updated periodically this candidate's alternate channel thus.

In the another embodiment of wireless device of the present invention, the measured channel determining section will be measured the channel measurement part that instruction sends to same equipment, if so that in the wireless channel of partly measuring by channel measurement, detect radio interference, then measure all available wireless channels or adjacent channel; If detect the interference source channel, then select not measure first state of interference source channel.

In the another embodiment of wireless device of the present invention, the measured channel determining section will be measured the channel measurement part that instruction sends to same equipment, if so that in the wireless channel of partly measuring by channel measurement, detect radio interference, then measure all available wireless channels or adjacent channel; If detect the interference source channel, then select not measure the third state of interference source channel.

As mentioned above, according to the present invention, be used for determining in all available wireless channels that the measured channel determining section of the channel that will measure will be measured to instruct and send to the channel measurement part that is used to measure wireless channel, so that only measure some channels in determined all wireless channels according to pre-defined algorithm.In addition, the measured channel determining section can be in all wireless channels be only selected between the measurement of the measurement of some channels and all available wireless channels.By this measurement of only channel of minimal amount being carried out as required, can shorten Measuring Time, and can carry out the detection of radio interference effectively.

Particularly, according to the present invention,, then next only measure and be detected the adjacent channel of channel of interference if in the measurement of odd-numbered or even-numbered channel, detect radio interference.This can obtain more effective channel measurement.

Description of drawings

Fig. 1 illustrates the structure in the BSS zone that comprises a wireless channel measurement controller in the embodiments of the invention 1.

Fig. 2 is the block diagram of the wireless communication system of conventional wireless terminal.

Fig. 3 is the block diagram with wireless communication system of the wireless channel measurement controller of the algorithm of foundation in the embodiment of the invention 1.

Fig. 4 is a sequential chart of only measuring some available channels in the embodiment of the invention 1.

Fig. 5 A is a sequential chart of measuring all available channels in the embodiment of the invention 1, and Fig. 5 B is a sequential chart of only measuring some available channels among this embodiment.

Fig. 6 illustrates the structure in the BSS zone that comprises a wireless channel measurement controller and two wireless terminals in the embodiments of the invention 2.

Fig. 7 is the block diagram with wireless communication system of the wireless channel measurement controller of the algorithm of foundation in the embodiment of the invention 2.

Fig. 8 is the block diagram of the wireless communication system of wireless terminal in the embodiment of the invention 2.

Fig. 9 is the exemplary plot that channel measurement in the BSS zone is shown, and the BSS zone comprises a wireless channel measurement controller and two wireless terminals in the embodiment of the invention 2.

Figure 10 is the sequential chart of channel measurement in the embodiment of the invention 2.

Figure 11 A to 11C is the exemplary plot that the measurement of adjacent channel in the BSS zone is shown, the BSS zone comprises a wireless channel measurement controller and two wireless terminals in the embodiment of the invention 2, wherein Figure 11 A illustrates first example of measuring, the example of the measurement of adjacent channel after the radio interference that is illustrated in Figure 11 B takes place, and Figure 11 C is illustrated in the example that the measurement of all channels after the radio interference occurs.

Figure 12 is the sequential chart of channel measurement in the embodiment of the invention 2.

Figure 13 illustrates wherein wireless channel at the view of the available frequency band of Japan.

Figure 14 is the view that the frequency band that wireless channel wherein can use in the North America is shown.

Figure 15 is the exemplary plot that the measurement of current channel and second-best candidate's alternate channel in the embodiment of the invention 3 is shown.

Figure 16 is the flow chart that algorithm in the embodiment of the invention 2 is shown.

Figure 17 is the flow chart that algorithm in the embodiment of the invention 3 is shown.

Figure 18 is the flow chart that another algorithm in the embodiment of the invention 3 is shown.

Figure 19 is the flow chart that another algorithm in the embodiment of the invention 3 is shown.

Figure 20 is the sequential chart of channel measurement in the embodiment of the invention 2.

Figure 21 is the flow chart that algorithm in the embodiment of the invention 4 is shown.

Figure 22 is the sequential chart of channel measurement in the embodiment of the invention 4.

Figure 23 is the sequential chart of channel measurement in the embodiment of the invention 5.

Embodiment

Hereinafter, by the reference accompanying drawing, wireless communication system of the present invention (wireless device) and wireless channel measurement controller are described.

(embodiment 1)

Hereinafter with reference to relevant drawings embodiments of the invention 1 are described.

Fig. 1 is the view that is illustrated in the basic service set (BSS) that only comprises a wireless terminal (wireless device) A in the BSS zone 10.In this case, wireless terminal A plays the effect of wireless channel measurement controller, is used for the definite wireless channel that will measure, to carry out channel measurement by himself.

Fig. 3 is the block diagram of wireless communication system in the present embodiment.The wireless communication system 30 of Fig. 3, the part as wireless channel measurement controller comprises: host machine part 31 has the measured channel determining section 32 that establishes the pre-defined algorithm that is used for the definite channel that will measure therein; And transmission/receiving unit 34, have the channel measurement part 33 of the user mode that is used to measure two or more wireless channels.

Measured channel determining section 32 is measured instruction 36 by sending, and request channel measurement part 33 is carried out channel measurement, and channel measurement part 33 will be notified to host machine part 31 by the measurement result 35 that channel measurement part 33 is made.

In wireless communication system 30, can between first state and second state, switch according to pre-defined algorithm.In first state, measured channel determining section 32 indicating channel measure portion 33 are only measured some channels in all available channels, and in second state, measured channel determining section 32 indicating channel measure portion 33 are measured all available channels.By suitably adopting first state or second state, can shorten the Measuring Time of all wireless channels.

Fig. 4 is the sequential chart that is illustrated in the measurement example under the situation that adopts first state, and the current available channel of some of them is measured.Beacon among Fig. 4 (beacon) represents that respectively by this information, the wireless device among the BSS can be discerned the existence of access point by the synchronizing information of the wireless device among the BSS (wireless channel measurement controller) A output.As the frequency measurement time limit, a beacon only can be used for a channel.In an example shown, channel Ch1, Ch3, Ch5 and Ch7 measure in four beacon interval of Measuring Time 40 respectively.

Fig. 5 A is the sequential chart that the measurement example under the situation that adopts second state is shown, all eight wireless channels wherein, and Ch1 to Ch8 is measured.If determine presently used channel, and come from the request of main frame and when presently used channel switches, determine candidate channel, will select the measurement in second state according to pre-defined algorithm so in response in the starting stage.Equally,, if in first state, detect the abnormality of radio interference, also can be switched to second state, thereby channel measurement part 33 can be measured all wireless channels, so that determine will be to its candidate channel of switching according to pre-defined algorithm.

Figure 13 shows at the available channel of Japan (four channels), and Figure 14 shows the channel (eight channels) that can use in the U.S..The radio interference that dash area 130 among Figure 13 and 140 representatives of the dash area among Figure 14 are caused by adjacent channel.Utilize radio communication to this feature from the radio interference sensitivity of adjacent channel.That is to say, measure channel (measuring the channel of odd number or even-numbered) every one, and if do not detect radio interference (from the interference of adjacent channel), then identify adjacent channel and be not used.For instance, if in the North America can with all eight wireless channels all to measure, shown in Fig. 5 A, will be essential corresponding to the Measuring Time 50 of eight beacons.Yet, as shown in Figure 4,, Measuring Time can be shortened to time corresponding to four beacons by only measuring some channels in these channels.

In the measurement of first state shown in Figure 4,, can determine to exist the disturbing wave that comes from current channel or adjacent channel if the radio interference grade surpasses predetermine level.By utilizing this fact, can realize the reduction of the channel quantity that will measure.

Although only measure the channel of odd-numbered among Fig. 4, the channel of equally only measuring even-numbered also is possible.Although in Fig. 4 with only once measurement as an example, measure and also can repeat any number of times to improve the precision of measuring.

Fig. 5 B illustrates when detecting radio interference, the detection of follow-up adjacent channel and the sequential chart of measurement.Fig. 5 B is illustrated in the situation that detects interference among the channel Ch5.In order to determine to cause the channel of the reason of radio interference among the channel Ch5, measure channel Ch4 and the Ch6 adjacent with channel Ch5.Shown in Fig. 5 B, measured channel Ch1, Ch3, Ch5 and Ch7 in the Measuring Time 51 of four beacons, and measured channel Ch4 and Ch6 in the Measuring Time 52 of two beacons subsequently.Like this,, promptly at first measure the channel of odd-numbered by utilizing pre-defined algorithm, and if detect radio interference by this measurement, then measure and detect the adjacent channel of channel of interference, can measure the correct radio state of wireless channel.

In above-mentioned wireless communication system 30, the pre-defined algorithm of setting up in measured channel determining section 32 can allow to be transformed into second state at the arbitrary timing of being set by host machine part 31, the for example timing of overflowing at the counting of setting by host machine part 31, all or other wireless channels are measured in the perhaps timing that expires of the time that timer internal is set in by host machine part 31, and indicating channel measure portion 33.

(embodiment 2)

Hereinafter with reference to relevant drawings embodiments of the invention 2 are described.

Fig. 6 is the view that is illustrated in the basic service set (BSS) that comprises three wireless devices (A, B and C) in the BSS zone 60.

The wireless device A of wireless network plays the effect of wireless channel measurement controller in the BSS zone 60 of composition diagram 6, and wireless device B and C are the wireless terminals of not bringing into play the wireless channel measurement controller effect.Except wireless channel measurement controller A, also there are under the situation of wireless terminal B and C the definable third state, the measurement of wherein in a plurality of wireless devices, only sharing some channels in all available wireless channels equally in the BSS zone.In this relation, suppose to allow wireless channel measurement controller A request wireless terminal B and C to carry out channel measurement.Notice that the conversion from first state of situation shown in Figure 1 to the third state of situation shown in Figure 6 is considered to the state exchange when networking in the network that stands in the BSS with access point.

Fig. 7 is the block diagram of the wireless communication system of wireless channel measurement controller A among the BSS60 with three wireless devices (A, B and C) shown in Figure 6.In the wireless communication system 70 of Fig. 7, the same in the wireless communication system 30 of image pattern 3, the channel measurement part 33 of the measured channel determining section 32 request same systems of host machine part 31 is measured wireless channel.In addition, the wireless communication system 70 of Fig. 7 sends the request of measurement 37 by transmission/receiving unit 34 to other wireless terminal B and C, and finish the wireless terminal B of measurement and C receives measurement result from response measurement request 37 by transmission/receiving unit 34, receive 38 as measurement result.

Fig. 8 is the block diagram of the wireless communication system of wireless terminal B or C among the same BSS 60 of Fig. 6.The same in the wireless communication system 70 of image pattern 7, the wireless communication system 80 of Fig. 8, basically form by host machine part 81 and transmission/receiving unit 83, in transmission/receiving unit 83, have channel measurement part 82, but in host machine part 81, do not have the measured channel determining section.In wireless communication system 80, the measurement request 37 that 83 receptions of transmission/receiving unit send from wireless communication system 70, and the request of should measuring is notified to host machine part 81 as measuring request reception 83.In response to this notice, host machine part 81 indicating channel measure portion 82 are carried out wireless channel measurements, and receive measurement result notify 84.The notice of the measurement result that is received outputs to transmission/receiving unit 83 as measurement result 85 from host machine part 81, is sent to wireless communication system 70 then.The measurement result 85 that sends from wireless communication system 80 by transmissions/receiving unit 34, receives 38 receptions by the host machine part 31 of the wireless communication system 70 of Fig. 7 as measurement result.

In BSS 60, only exist under the situation of wireless channel measurement controller A, as the above description of carrying out with reference to Fig. 3, measured channel determining section 32 will send to channel measurement part 33 about the instruction of measured channel, and channel measurement part 33 is given host machine part 31 with the channel measurement result notification.

Fig. 9 illustrates the example of channel measurement, wherein has two wireless terminals (B and C) in the BSS 60 with a wireless channel measurement controller A shown in Figure 6.In Fig. 9, wireless terminal A request wireless terminal B is measured different channels with C, as request wireless terminal B measured channel Ch1 and Ch3, and request wireless terminal C measured channel Ch5 and Ch7, and receive the measurement result 90 that comes from wireless terminal B and C, realize effective retrieval of channel measurement result thus.Note at this, for the order of the channel that will measure, need not increase importance especially.

Figure 10 is the sequential chart that channel measurement among Fig. 9 is shown.In Figure 10, in the Measuring Time 100 of three beacons, during the commitment defini interval after sending first beacon, wireless device (wireless channel measurement controller) A at first will measure instruction and send to wireless device (wireless terminal) B and C.Receive this measurement instruction, measured channel Ch1 during the commitment defini interval of wireless terminal B after first beacon, measured channel Ch3 during the commitment defini interval after second beacon, and during the commitment defini interval after the 3rd beacon, this measurement result sends to wireless channel measurement controller A the most at last.

Similarly, the measurement instruction that reception is sent by wireless channel measurement controller A, measured channel Ch5 during the commitment defini interval of wireless terminal C after first beacon, measured channel Ch7 during the commitment defini interval after second beacon, and during the commitment defini interval after the 3rd beacon, this measurement result sends to wireless channel measurement controller A the most at last.During the commitment defini interval of wireless channel measurement controller A after the 3rd beacon, receive from the measurement result of wireless terminal B and C transmission.

As mentioned above, when in BSS, except wireless channel measurement controller A, also having wireless terminal B and C, and when having a plurality of available channel, for example in the North America that has eight channels to use, can select the third state according to pre-defined algorithm, wherein the channel that will measure is assigned to a plurality of wireless terminal B and the C among the BSS, measures to realize local channel.Like this, can in the time of three beacons, finish one section measurement, and if use a wireless terminal to carry out the time that this section measurement will need eight beacons, this has shortened Measuring Time widely.

Although only figure 10 illustrates measurement once, this measurement also can be repeated any number of times.Although in Figure 10, only measured the channel of odd-numbered, also can only measure the channel of even-numbered.Although in Figure 10, all wireless terminal B, C among the BSS have been made the request of measurement, also can only ask some wireless terminals among the BSS.In the above description, when having a plurality of wireless terminal in the BSS zone, wireless channel measurement controller is all left whole channel measurement for these wireless terminals and is handled.Replacedly, wireless channel measurement controller self also can be shared a part of channel measurement.

If in the third state shown in Fig. 9 and 10, detected radio interference, can adopt four condition, wherein measure all available channels by sharing equally.This state has been shown in Figure 11 A and 11C.In Figure 11 A, wireless channel measurement controller A request wireless terminal B measured channel Ch1 and Ch5, and request wireless terminal C measured channel Ch3 and Ch7.At this moment, if the measurement result 110 that sends from wireless terminal B, find out, in channel Ch5, detect radio interference, then wireless channel measurement controller A request wireless terminal B is measured the channel Ch2/4/1/5 in all available channels, and request wireless terminal C measured channel Ch6/8/3/7, and receive the measurement result 110 that comes from wireless terminal B and C.

Figure 20 is the sequential chart of handling among Figure 11 A and the 11C.In Figure 20, wireless device (wireless channel measurement controller) A at first sends during first commitment defini interval and measures instruction.Receive wireless device (wireless terminal) B of this measurement instruction, measured channel Ch1 and Ch5 during two continuous commitment defini intervals.In illustrated embodiment, in channel Ch5, detect radio interference.In third communication interim, wireless terminal B sends to wireless channel measurement controller A with measurement result.Similarly, during first commitment defini interval, receive wireless device (wireless terminal) C that measures instruction from wireless channel measurement controller A, measured channel Ch3 during first commitment defini interval, at second communication interim measured channel Ch7, and measurement result is sent to wireless channel measurement controller A in third communication interim.Wireless channel measurement controller A receives measurement result in third communication interim from wireless terminal B and C, and in third communication interim transmission measurement instruction, measure channel Ch2/4/1/5 in all available channels with the request wireless terminal B, and request wireless terminal C measured channel Ch6/8/3/7.Receive this measurement instruction, wireless terminal B and C measure each self-channel that distributes on the 3rd to the 6th commitment defini interval, and during next the 7th commitment defini interval, measurement result are sent to wireless channel measurement controller A.Wireless channel measurement controller A receives measurement result from wireless terminal B and C during the 7th commitment defini interval.

As mentioned above, carry out channel measurement according to pre-defined algorithm, wherein the channel allocation that will measure is given a plurality of wireless terminals (third state) among the BSS, if and in any one channel, detect radio interference, then, measure all available channels (four condition) by in a plurality of wireless terminals, sharing this measurement equally.Therefore, even just in case detected radio interference, the total time also can be shortened into the Measuring Time 200 of seven beacons.After four condition, recover the third state to continue this measurement.

Below will utilize the flow chart of Figure 16, the example of above-mentioned measurement will be discussed.To be described the flow chart of Figure 16 respectively with two parts: flow chart 16A is used for only having at wireless network the situation of a wireless terminal, and flow chart 16ABC is used for except wireless channel measurement controller, also has the situation of a plurality of wireless terminals.

At first, in flow chart 16A,, all available wireless channels are measured (second state), to determine current channel at step S1601.At step S1602, determine in same wireless network, whether there are other equipment (wireless terminal).If there are other wireless terminals, in step S1603, determine whether and to make the request of measurement to these wireless terminals.If these wireless terminals have been made the request of measurement, then this process moves to flow chart 16ABC.If make the request of measuring, perhaps if there is no other wireless terminals, then this process proceeds to step S1604, to carry out the measurement (first state) of odd-numbered or even-numbered channel.Whether in case the measurement among the step S1604 is terminated, then this process proceeds to step S1605, busy to determine current channel, that is to say, whether current channel is used to the communication undertaken by another wireless network that causes radio interference.If determine current channel idle, then this process turns back to step S1604, to measure odd-numbered or even-numbered channel.If determine current channel busy, then this process turns back to step S1601, determines based on the channel of whole channel measurements with beginning.

Next flow chart 16ABC will be described.If determine other wireless terminals are made the request of measurement at step S1603, the request of then should measuring in the step S1606 of flow chart 16ABC sends to other wireless terminals (third state) from the wireless measurement controller.Next in step S1607, return the measurement result of making by other wireless terminals.The wireless channel measurement controller that has received this measurement result in step S1608 determines whether current channel is busy.If determine current channel busy, then this process turns back to step S1606.If determine current channel idle, then this process proceeds to step S1609.In step S1609, determine whether to measure all channels.In step S1610, if measure all channels, the wireless channel measurement controller request of will measuring sends to other wireless terminals, with the measurement (four condition) of sharing all channels equally.In step S1611, wireless channel measurement controller receives the measurement result of being finished by the other-end that receives the request of measurement.After four condition, this process turns back to the step S1606 that recovers the third state, and proceeds to measure.

In the above description, when having a plurality of wireless terminal in the BSS zone, wireless channel measurement controller is all left whole channel measurement for these wireless terminals and is handled.Replacedly, wireless channel measurement controller self also can be shared channel measurement.

Next, with reference to Figure 11 A and 11B, in the third state shown in Fig. 9 and 10, if detect radio interference then the situation of measuring adjacent channel is described.Owing to measure some available channel by sharing equally, regard this situation as the third state.

In Figure 11 A, wireless channel measurement controller A request wireless terminal B measured channel Ch1 and Ch5, and request wireless terminal C measured channel Ch3 and Ch7.At this moment, if in the measurement result 110 that wireless terminal B sends, find out, detect radio interference in channel Ch5, then wireless channel measurement controller A request wireless terminal B and C measure adjacent channel Ch4 and Ch6 respectively, and receive the measurement result 110 that comes from wireless terminal B and C.

Figure 12 is the sequential chart of handling among Figure 11 A and the 11B.In Figure 12, wireless device (wireless channel measurement controller) A at first sends during first commitment defini interval and measures instruction.Receive wireless device (wireless terminal) B of this measurement instruction, measured channel Ch1 and Ch5 during two continuous commitment defini intervals.In an example shown, in channel Ch5, detect radio interference.In third communication interim, wireless terminal B sends to wireless channel measurement controller A with measurement result.Similarly, during first commitment defini interval, receive wireless device (wireless terminal) C that measures instruction from wireless channel measurement controller A, measured channel Ch3 during first commitment defini interval, at second communication interim measured channel Ch7, and measurement result is sent to wireless channel measurement controller A in third communication interim.Wireless channel measurement controller A receives measurement result in third communication interim from wireless terminal B and C, and in third communication interim transmission measurement instruction, measure and the adjacent channel Ch4 of channel Ch5 that detects radio interference with the request wireless terminal B, and request wireless terminal C measures the channel Ch6 as another adjacent channel.Receive this measurement instruction, wireless terminal B and C measure the channel that distributes separately on third communication interval, and believe interim at next four-way, and measurement result is sent to wireless channel measurement controller A.Wireless channel measurement controller A believes that at four-way interim receives measurement result from wireless terminal B and C.

Thereby, carrying out local channel according to pre-defined algorithm measures, wherein give a plurality of wireless terminals among the BSS by the channel allocation that will measure, carry out channel measurement (third state), if and in any one channel, detect radio interference, then, measure and detecting the adjacent channel in channel both sides of interference by further adjacent channel being distributed to wireless terminal.By this way, even just in case detected radio interference, the total time also can be shortened into the Measuring Time 120 of four beacons.Replacedly, in order to improve the certainty of measurement of radio interference, can indicate the terminal that detects radio interference to measure adjacent channel.

As mentioned above, when a plurality of wireless terminal of existing in the BSS zone except wireless channel measurement controller, wireless channel measurement controller can ask wireless terminal to carry out channel measurement, to shorten Measuring Time.

Below will utilize the flow chart of Figure 16, the example of above-mentioned measurement will be discussed.

If in the step S1603 of flow chart 16A, determine other wireless terminals are made the request of measurement, in the step S1606 of flow chart 16ABC then, should measure and ask to send to other wireless terminals (third state) from the wireless measurement controller.Next in step S1607, return the measurement result of making by other wireless terminals.The wireless channel measurement controller that has received this measurement result in step S1608 determines whether current channel is busy.If determine current channel busy, then this process turns back to step S1606.If determine that current channel is idle, then this process proceeds to step S1609.In step S1609, determine whether to measure all channels.If do not measure all channels, then in step S1612, determine whether to measure adjacent channel (predetermined channel).If do not measure adjacent channel, then this process turns back to step S1606.Otherwise this process proceeds to step S1613.In step S1613, the wireless channel measurement controller request of will measuring sends to other wireless terminals, to carry out the measurement (the 3rd gos deep into state) of adjacent channel in step S1613.In step S1611, wireless channel measurement controller receives the measurement result of being finished by the other-end that receives the request of measurement.After the 3rd goed deep into state, this process turned back to the step S1606 that recovers the third state, and proceeded to measure.

In the above description, when having a plurality of wireless terminal in the BSS zone, wireless channel measurement controller is all left whole channel measurement for these wireless terminals and is handled.Replacedly, wireless channel measurement controller self also can be shared channel measurement.

(embodiment 3)

Next, will describe a kind of channel selecting method, be used to select to want the minimal amount of measured channel.

In the present embodiment, in the wireless channel measurement controller of wireless communication system 70 with Fig. 7, indicating channel measure portion 33 is measured all channels (second state), and in measured channel determining section 32 the second-best channel of measurement result is stored as candidate's alternate channel.In measuring, priority gives second-best candidate's alternate channel (first state), rather than measures all channels next time.Like this, can shorten the Measuring Time that is used for all wireless channels.

Figure 15 is the sequential chart of aforesaid operations.Have as the North America under the situation of eight available channels more than the channel, in Measuring Time 150, at first measuring all wireless channels.Eight channels in the middle of, Measuring Time 151 in only measure current channel (in this example be channel Ch1) and second-best channel (in this example be Ch8) thereafter.This can shorten to Measuring Time the time of two beacons.Although in Figure 15, in Measuring Time 151 and 152, only two channel Ch1 and Ch8 are carried out twice measurement, also can repeat repeatedly to measure arbitrarily, to improve certainty of measurement.Figure 17 shows the flow chart of this processing.

Among Figure 17,, measure all wireless channels (second state) at step S1701.At step S1702, in the middle of all wireless channels, select second-best channel as the candidate replacer.At step S1703, two channels are measured: current channel and candidate's alternate channel (first state).At step S1704, determine whether current channel is busy.If determine current channel idle, then this process turns back to the step S1703 that is used for channel measurement.If determine current channel busy, then this process proceeds to step S1705, replaces current channel to use candidate's alternate channel.Next this process turns back to the step S1701 that is used to measure all wireless channels, to select new candidate's alternate channel.Mode is carried out the measurement of all wireless channels at first like this, and based on this measurement result, will be stored as candidate's alternate channel by the second-best channel of communications status (user mode) for current channel of communicating by letter.As long as in current channel, radio interference do not occur, in step S1703 and S1704, just repeat measurement to two channels.By utilizing this pre-defined algorithm, can shorten Measuring Time.

Although in an example shown, wireless channel measurement controller is carried out and is measured, and it also can ask the wireless terminal among the BSS to carry out measurement.

As another example of handling, in the wireless channel measurement controller of wireless communication system 70 with Fig. 7, indicating channel measure portion 33 is measured all channels, and in measured channel determining section 32 the second-best channel of measurement result is stored as candidate's alternate channel.In this example, when not only in current channel, radio interference occurring, and when in second-best candidate's alternate channel, radio interference occurring, all to measure all wireless channels.This allows the maintenance to the candidate's alternate channel that always upgrades, and therefore can shorten the Measuring Time of all wireless channels.Figure 18 is the flow chart of this processing.

At step S1801 in the processing of S1804 and S1806, the flow chart of Figure 18 flow chart with Figure 17 basically is identical, but its difference part is, if determine current channel idle in step S1804, will determine further in step S1805 so whether candidate's alternate channel is busy.If determine that in step S1805 candidate's alternate channel is busy, then this process turns back to step S1801, all wireless channels is measured, to select new candidate's alternate channel.If determine candidate's alternate channel free time in step S1805, then this process turns back to step S1803, to proceed the measurement to current channel and current candidate's alternate channel.Mode is carried out the measurement of all wireless channels at first like this, and based on this measurement result, will be stored as candidate's alternate channel by the second-best channel of communications status (user mode) for current channel of communicating by letter.As long as radio interference do not occur in current channel and candidate's alternate channel, step S1803 just repeats the measurement to these two channels in the processing of S1804.By adopting this pre-defined algorithm, can shorten Measuring Time.

As another example of handling, in the wireless channel measurement controller of wireless communication system 70 with Fig. 7, indicating channel measure portion 33 is measured all channels, and in measured channel determining section 32 the second-best channel of measurement result is stored as candidate's alternate channel.In this example, periodically all channels are measured, realizing maintenance, and therefore can be shortened Measuring Time all wireless channels to the candidate's alternate channel that always upgrades.Figure 19 is the flow chart that this processing is shown.

In the processing of S1904 and S1907, the flow chart of Figure 19 flow chart with Figure 17 basically is identical at step S1901, but determines in step S1904 in the processing afterwards of current channel idle, difference to some extent with it.Particularly, after determining the whether busy step 1904 of current channel, determine in step S1905 whether candidate's alternate channel is busy.If determine that candidate's alternate channel is busy, then this process turns back to step S1901, to select new candidate's alternate channel.If determine candidate's alternate channel free time, then this process proceeds to step S1906, whether needs to redefine candidate's alternate channel with decision.If decision will redefine, then this process turns back to step S1901.Otherwise this process turns back to step S1903, to proceed the measurement to current channel and current candidate's alternate channel.Mode is carried out the measurement of all wireless channels at first like this, and based on this measurement result, will be stored as candidate's alternate channel by the second-best channel of communications status (user mode) for current channel of communicating by letter.As long as radio interference do not occur in current channel or candidate's alternate channel, step S1903 just repeats the measurement to two channels in the processing of S1906.In addition,, also to determine whether and to redefine, to obtain better candidate replacer even in current candidate's alternate channel, radio interference do not occur.By adopting this pre-defined algorithm, can keep the candidate's alternate channel that always upgrades.

(embodiment 4)

Hereinafter with reference to relevant drawings,, be described as embodiment 4 with using the method for measurement of the algorithm different with used algorithm among the embodiment 2.Figure 22 is the sequential chart of this method of measurement.

In Figure 22, have only the measurement of wireless device (wireless channel measurement controller) A execution to channel Ch1/3/5/7.In an example shown, in channel Ch7, detect radio interference, and during the 5th to the 13 commitment defini interval subsequently, measure all channel Ch1 to Ch8.In case channel Ch7 is confirmed as interference source, next measure the channel Ch1/3/5 except that Ch7.Mode if detecting radio interference under first state in arbitrary channel, is just measured (second state) to all available channels like this.In case determine interference source, then no longer measure determined channel.By adopting this pre-defined algorithm, can in first state of the channel that reduces number, carry out channel measurement.

In above-mentioned sequential chart, after detecting radio interference, all channels are measured.Replacedly, can only measure and detect the adjacent channel of channel of interference, to determine the interference source channel.

In Figure 22, only show one-shot measurement.Replacedly, in order to improve certainty of measurement, also can carry out multiple measurement.Figure 21 is the flow chart that this processing is shown.In the flow chart of Figure 21, step S1601 to S1605 basically with the flow chart of Figure 16 in identical.After in step S1601, all available wireless channels being measured,, then in step S2102, determine whether from the channel that will measure, to delete this interference source channel if in step S2101, a certain given channel is defined as radio interference source.If determine deletion, in step S2103, from the channel that will measure, delete the interference source channel, and next in step S2104, determine whether also to remain any channel that will measure.If have remainingly, then this process turns back to step S1602.Otherwise it is the channel that comprises all deletions that the channel that will measure is resumed, and this process turns back to step S1602.

(embodiment 5)

Hereinafter with reference to relevant drawings, under the situation that has a plurality of wireless terminals, use the method for measurement of the algorithm different with used algorithm among the embodiment 2, be described as embodiment 5.Figure 23 is the sequential chart of this method of measurement.

In Figure 23, wireless device (wireless channel measurement controller) A at first sends during first commitment defini interval and measures instruction.Receive wireless device (wireless terminal) B of this measurement instruction, measured channel Ch1 and Ch5 during two continuous commitment defini intervals.In third communication interim, wireless terminal B sends to wireless channel measurement controller A with measurement result.Similarly, receive wireless device (wireless terminal) C that measures instruction from wireless channel measurement controller A during first commitment defini interval, measured channel Ch3 during first commitment defini interval is at second communication interim measured channel Ch7.In an example shown, in channel Ch7, detect radio interference.In third communication interim, wireless terminal C sends to wireless channel measurement controller A with measurement result.Wireless channel measurement controller A receives measurement result in third communication interim from wireless terminal B and C, and in third communication interim transmission measurement instruction, measure and the adjacent channel Ch6 of channel Ch7 that detects interference with the request wireless terminal B, and request wireless terminal C measures the channel Ch8 as another adjacent channel.Receive this measurement instruction, wireless terminal B and C measure separately allocated channel in third communication interim, and in next four-way letter interim measurement result are sent to wireless channel measurement controller A.Wireless channel measurement controller A believes that at four-way interim receives measurement result from wireless terminal B and C.

As measurement result,, just in channel measurement subsequently, from the channel that will measure, delete the interference source channel in case channel Ch7 is defined as the interference source channel.Particularly, wireless device (wireless channel measurement controller) A measures instruction in the interim transmission of four-way letter.Wireless device (wireless terminal) B measured channel Ch1 and Ch5 during two continuous commitment defini intervals, and next during the 6th commitment defini interval, measurement result sent to wireless channel measurement controller A.Wireless device (wireless terminal) C response comes from the measurement instruction of wireless channel measurement controller A, at four-way letter interim measured channel Ch3, and next believes that at five-way interim sends to wireless channel measurement controller A with measurement result.

As mentioned above, if in any one channel of the third state, detect radio interference, by sharing the adjacent channel of channel of measuring and detect interference equally.In case determine the interference source channel, then no longer measure determined channel.By adopting this kind pre-defined algorithm, can in the third state of the channel that reduces number, carry out channel measurement.

In the sequential chart of Figure 23, after detecting radio interference, only measure adjacent channel.Replacedly, also can after detecting radio interference, measure all channels.Equally, in order to improve certainty of measurement, can indicate the terminal that detects radio interference to measure adjacent channel.

In the present embodiment, have only wireless terminal to carry out channel measurement.Replacedly, wireless channel measurement controller also can be shared this measurement.Flow process at Figure 21 there is shown above-mentioned processing.

In the flow chart of Figure 21, step S1601 to S1613 basically with the flow chart of Figure 16 in identical.If after in step S1608, detecting radio interference in the current channel, in step S1609, determine all channels are measured, then wireless channel measurement controller sends to other wireless terminals with this measurement result in step S1610, sharing measurement equally, and in step S1611, receive this measurement result to all channels.If in step S1609, do not measure all channels, then in step S1612, determine whether to measure adjacent channel.If measure adjacent channel, then the wireless channel measurement controller request of will measuring sends to other wireless terminals, so that carry out the measurement to adjacent channel in step S1603, and receives this measurement result in step S1611.

From the result who receives, determine to determine whether from the channel that will measure, to delete this interference source channel at step S1620 after the interference source channel.If determine deletion, then in step S2202, from the channel that will measure, delete the interference source channel, and next in step S2203, determine whether also to remain any channel that will measure.If have remainingly, then this process turns back to step S1606, to recover the third state.Otherwise it is the channel that comprises all deletions that the channel that will measure is resumed, and this process turns back to step S1606, to recover the third state.

As mentioned above, if in any one channel of the third state, detect radio interference, then the channel adjacent with the channel that detects interference measured by sharing equally to come.In case determine the interference source channel, then no longer measure determined channel.By adopting this kind pre-defined algorithm, can in the third state of the channel that reduces number, carry out channel measurement.

In the sequential chart of Figure 23, after detecting radio interference, only measure adjacent channel.Replacedly, also can after detecting radio interference, measure all channels.Equally, in Figure 23, only show one-shot measurement.In order to improve certainty of measurement, can certainly carry out multiple measurement.In order further to improve certainty of measurement, can indicate the terminal that detects radio interference to measure adjacent channel.

In the present embodiment, have only wireless terminal to carry out channel measurement.Replacedly, wireless channel measurement controller also can be shared this measurement.

Although invention has been described in a preferred embodiment, yet it will be appreciated by those skilled in the art that, disclosed invention can be made amendment according to multiple mode, and can take the many embodiment except above the embodiment that clearly shows and describe.Therefore, appended claim desire covers all changes of the present invention that drop within practicalness of the present invention and the scope.

Claims (19)

1. one kind has the wireless device of measuring the user mode function, and described user mode is represented the advantage or the inferior position of the communications status of two or more wireless channels, and this equipment comprises:

The channel measurement part is used to measure the user mode of described wireless channel; With

The measured channel determining section is used for determine wanting measured wireless channel, and will measure to instruct and send to this channel measurement part,

Wherein this measured channel determining section is according to pre-defined algorithm, the odd-numbered in all available wireless channels only or the first measured state of wireless channel of even-numbered, and selected between measured second state of all available wireless channels, and should measure instruction and sent to this channel measurement part.

2. equipment as claimed in claim 1, wherein this wireless device is a wireless channel measurement controller of forming wireless network with one or more other wireless terminals, each described other wireless terminal all has the channel measurement part, is used to measure the user mode of described wireless channel.

3. equipment as claimed in claim 1, if wherein detect radio interference in the measurement of the wireless channel of current use, then this measured channel determining section is selected this second state, and should measure instruction and send to this channel measurement part.

4. equipment as claimed in claim 1, wherein this measured channel determining section is according to this pre-defined algorithm, select this first state, wherein only the wireless channel of odd-numbered in all available wireless channels or even-numbered is measured, and should measure instruction and send to the channel measurement part.

5. equipment as claimed in claim 1, wherein this measured channel determining section is according to this pre-defined algorithm, select this first state, the channel that wherein comprises the odd-numbered of wireless channel of current use or even-numbered in all available wireless channels is measured, and should measure instruction and sent to this channel measurement part, if any one in the channel of described odd-numbered or even-numbered detects radio interference, then adjacent with the channel that is detected interference channel is measured, and should measure instruction and send to this channel measurement part.

6. equipment as claimed in claim 1, wherein this wireless device is a wireless channel measurement controller of forming wireless network with one or more other wireless terminals, each described other wireless terminal all has the channel measurement part, is used to measure the user mode of described wireless channel; And

The measured channel determining section of this wireless channel measurement controller is according to this pre-defined algorithm, in the third state and four condition, select, and will measure in the channel measurement part that instruction sends to this wireless channel measurement controller and other wireless terminals at least one, in this third state, only measure the odd-numbered in all available wireless channels or the wireless channel of even-numbered by in partly at least two of the channel measurement of the channel measurement of this wireless channel measurement controller part and described other wireless terminals, in this four condition, measure all available wireless channels by in partly any two of the channel measurement of the channel measurement of this wireless channel measurement controller part and described other wireless terminals.

7. equipment as claimed in claim 6, wherein this measured channel determining section if described other wireless terminals become and are not connected to this wireless network, then is transformed into this first or second state according to this pre-defined algorithm; If described other wireless terminals become and are connected to this wireless network, then be transformed into the 3rd or four condition.

8. equipment as claimed in claim 6, wherein this measured channel determining section will be measured the channel measurement part that instruction sends to other wireless terminals that belong to same wireless network, to measure different wireless channels.

9. equipment as claimed in claim 6, if wherein in any wireless channel of partly measuring by described channel measurement, detect radio interference, then this measured channel determining section will be measured at least one in the channel measurement part that instruction sends to this wireless channel measurement controller and other wireless terminals, to measure all available wireless channels.

10. equipment as claimed in claim 1, wherein this measured channel determining section is selected this second state according to this pre-defined algorithm, the second-best wireless channel of user mode in these all available wireless channels is stored as candidate's alternate channel of current channel of communicating by letter, this second-best wireless channel is determined according to the result who in response to the measurement instruction that sends to this channel measurement part from this measured channel determining section is the measurement carried out of these all available wireless channels, according to this pre-defined algorithm, select only to measure current channel of communicating by letter and this candidate's alternate channel, and should measure to instruct and send to this channel measurement part.

11. equipment as claimed in claim 10, if wherein in this candidate's alternate channel, detect radio interference according to this pre-defined algorithm, then this measured channel determining section is selected this second state, and should measure the instruction send to this channel measurement part, partly measure all available wireless channels to indicate this channel measurement.

12. equipment as claimed in claim 10, wherein this measured channel determining section is periodically selected this second state according to this pre-defined algorithm, and should measure the instruction send to this channel measurement part, be updated periodically this candidate's alternate channel thus.

13. equipment as claimed in claim 1, wherein this measured channel determining section should be measured instruction and send to this channel measurement part, if thereby in the wireless channel of partly measuring by this channel measurement, detect radio interference, then measure all available wireless channels or adjacent channel, if detect the interference source channel, then select not measure first state of this interference source channel.

14. one kind has the wireless device of measuring the user mode function, described user mode is represented the advantage or the inferior position of the communications status of two or more wireless channels, and this equipment comprises:

The channel measurement part is used to measure the user mode of described wireless channel; With

The measured channel determining section is used for determine wanting measured wireless channel, and will measure to instruct and send to this channel measurement part,

Wherein this measured channel determining section is according to pre-defined algorithm, in the third state and four condition, select, and will measure the channel measurement part that instruction sends to this wireless device self, and in the channel measurement of other wireless terminals part at least one, in this third state, only measure the odd-numbered in all available wireless channels or the wireless channel of even-numbered by in partly at least two of the channel measurement of this channel measurement part and one or more other wireless terminals, in this four condition, measure all available wireless channels by any two in the channel measurement part of this channel measurement part and described other wireless terminals.

15. equipment as claimed in claim 14, if wherein in any wireless channel, detect radio interference by any one measurement in described other wireless terminals, and the adjacent channel of wireless channel of interference is being measured and be detected to neither one in described other wireless terminals, then this measured channel determining section will be measured instruction and send to these other wireless terminals of measuring the wireless channel that is detected interference, to measure this adjacent channel.

16. equipment as claimed in claim 14, wherein this measured channel determining section is selected this four condition according to this pre-defined algorithm, the second-best wireless channel of user mode in these all available wireless channels is stored as candidate's alternate channel of current channel of communicating by letter, this second-best wireless channel is determined according to the result who in response to the measurement instruction that sends to this channel measurement part from this measured channel determining section is the measurement carried out of these all available wireless channels, according to this pre-defined algorithm, select only to measure current channel of communicating by letter and this candidate's alternate channel, and should measure to instruct and send to this channel measurement part.

17. equipment as claimed in claim 16, if wherein in this candidate's alternate channel, detect radio interference according to this pre-defined algorithm, then this measured channel determining section is selected this four condition, and should measure the instruction send to this channel measurement part, partly measure all available wireless channels to indicate this channel measurement.

18. equipment as claimed in claim 16, wherein this measured channel determining section is periodically selected this four condition according to this pre-defined algorithm, and should measure the instruction send to this channel measurement part, be updated periodically this candidate's alternate channel thus.

19. equipment as claimed in claim 14, wherein this measured channel determining section should be measured instruction and send to this channel measurement part, if thereby in the wireless channel of partly measuring by this channel measurement, detect radio interference, then measure all available wireless channels or adjacent channel, if detect the interference source channel, then select not measure the third state of this interference source channel.

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