CN2877154Y - System for seamles channel change in wireless local area network - Google Patents
System for seamles channel change in wireless local area network Download PDFInfo
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- CN2877154Y CN2877154Y CN 200520105339 CN200520105339U CN2877154Y CN 2877154 Y CN2877154 Y CN 2877154Y CN 200520105339 CN200520105339 CN 200520105339 CN 200520105339 U CN200520105339 U CN 200520105339U CN 2877154 Y CN2877154 Y CN 2877154Y
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Abstract
A method for seamless channel change in a wireless local area network having a station (STA) and an access point (AP) begins by sending a channel change intention message from the AP to the STA. A channel change response message is sent from the STA to the AP, informing the AP whether the STA will follow the channel change. The AP determines whether to proceed with the channel change, and performs the channel change if the determination is positive.
Description
Technical field
The utility model is about a kind of WLAN (WLAN), the utility model especially about a kind of in a WLAN method of seamless channel change.
Background technology
In the wlan system that in infrastructure mode, operates, be linked to an access point (AP) of a basic service set (BSS), typically have the coupled knot of one or more platform (STAs).Described AP and relevant STAs thereof when this channel is crowded (that is flow shown on described passage is very high), just need the node of BSS to use more crowded passage by send and receive package to communicate with one another on a given passage.Similarly, if described channel is subjected to the influence of system external disturbance,, but wishes and more need the different passage of BSS node use though this is more common on unwarranted frequency band.
BSSs changes the most typical method of passage, it transmits the channel of all frames (management, control and data) to described AP at a specific time changing, this expression STA will stop to receive any frame from its AP suddenly, and all frames that will deliver to AP are considered as non-affirmation, the service responsive for service quality (QoS), this service disruption can't satisfy the user.
In order to satisfy the regulatory demand that in the 5GHz in Europe frequency band, operates, made correction (IEEE 802.11h) in WLAN medium access control (MAC) and physical layer (PHY) specification, allow in the wlan system and the radar system of 5GHZ frequency band in the correction and deposit, but it does not provide and makes terminal user seamless and effectively utilize the method for Radio Resource to implement channel change, when AP or its passage of STA decision replacing, the family of 802.11 standards does not provide any hand (hand-shaking) form of changing to guarantee seamless channel change.
Operating on the system of infrastructure mode, 803.11h specification comprises an announcement information, it allows described AP to notify described STA future with switching channel, in high-level, there are three selections to make described notice possess acceptance condition, and described passage will switch, and it should be noted that known technology does not provide any mechanism for following situation:
1) STA request AP changes passage.
2) STA confirms to receive the notice from AP, and it will follow described AP replacing to new passage.In 802.11h, notice is to use broadcasting to implement, so AP do not receive any affirmation (ACK) and make it can judge whether described STA will follow to described new tunnel, or whether described STA correctly receives described notice.This can cause a kind of situation, be an AP do not need to transmit and again transmission frame give and not follow the STA of AP to new tunnel, the number of frames that cushions in AP may be very a large amount of, and will cause wireless medium very inefficent, this is because the relevant multiple window that falls back of transmission again can present the growth of exponential type.
3) STA confirms that it has followed AP to new tunnel, and this can produce inefficiency situation similar to the above.
Therefore, the method and apparatus that needs a kind of seamless channel change in a WLAN is just arranged.
The utility model content
The purpose of this utility model provides the system that carries out seamless channel change in a kind of WLAN, and it has the not enough mechanism of carrying out of known this system.
System provided by the utility model comprises an access point and a platform.Described access point comprises the first channel-changing notifying device; The first channel-changing decision maker, it is connected to the described first channel-changing notifying device; The first channel-changing device, it is connected to the described first channel decision maker; Measurement request device, it is connected to the described first channel-changing decision maker; First transmitter/receiver, it is connected to the described first channel-changing notifying device, the described first channel-changing device and described measurement request device; And first antenna, it is connected to described first transmitter/receiver; Described platform comprises: second channel changes notifying device; Second channel changes decision maker, and it is connected to described second channel and changes notifying device; The platform performance devices, it is connected to described second channel and changes decision maker; The second channel modifier, it is connected to described second channel and changes decision maker; Second transmitter/receiver, it is connected to described second channel and changes notifying device and described second channel modifier; The measurement report device, it is connected to described second transmitter/receiver; And second antenna, it is connected to described second transmitter/receiver.
Via system of the present utility model, mechanism of providing at following situation of failing in the known system is provided for it: platform changes channel to the access point request, this platform acknowledges receipt of the channel-changing notice of access point and follows this access point to new channel, and this platform confirms to have followed this access point to new channel.
Via system provided by the utility model, platform can change channel to the access point request, this platform can send one and confirm to receive the affirmation of channel-changing notice to this access point, and follow this access point to new channel, and this platform can send an affirmation followed this access point to the affirmation of new channel to this access point; The utility model has solved the problem of above-mentioned known system thus.
Therefore the utility model overcomes the restriction of prior art, allows to carry out seamless channel change at a WLAN, and does not need break in service and can significantly not reduce the efficient of wireless medium.
A kind of have the method for seamless channel change among the WLAN of a STA and an AP one.At first send a channel change intent information to described STA by described AP.Then send a channel change response message to described AP, notify the described STA of described AP whether will follow channel change by described STA.Described AP judges whether continue channel change, and if be judged to be and be, just carry out described channel change.
Another kind of have the method for seamless channel change among the WLAN of a STA and an AP one.At first send a channel change request to described AP by described STA.Judge whether can carry out channel change, and described channel change system carries out according to described judgement.
Two methods all comprise a non-essential additional step, and it sends a channel change by described STA and carry out information to described AP according to the successful execution of described channel change.
A kind ofly comprise in the WLAN of an AP and a STA, carry out the system of a seamless channel change one.Described AP is configured to send a channel-changing intent information to described STA.Described STA is configured to send a channel-changing response message to described AP, comprises an indication, indicates described STA whether will follow described AP to a new tunnel.After receiving described channel change response message, described AP more is configured to judge whether will continue channel change, if just and to be judged to be to carry out described channel change.Although described AP will consider the response message from described STA, the decision that whether continues described channel change does not need according to described response message.
Another kind comprises in the WLAN of an AP and a STA one, carries out the system of a seamless channel change.Described STA is configured to send a channel-changing solicited message to described AP.Only support in the example of a STA at AP described AP is configured to judge whether described channel change can be performed, and carries out described channel change according to described judgement.Support that at AP described AP is configured to begin aforesaid channel-changing program via described channel change intent information in the example of the STA above.
A kind ofly comprise in the WLAN of an AP and a STA, carry out the system of a seamless channel change one.Described AP comprises the first channel-changing notifying device; The first channel-changing decision maker, it is connected to the described first channel-changing notifying device; One measurement request device, it is connected to the described first channel-changing decision maker; First transmitter/receiver, it is connected to the described first channel-changing notifying device, the described first channel-changing device and described measurement request device; And first antenna, it is connected to described first transmitter/receiver.Described STA comprises second channel and changes notifying device; Second channel changes decision maker, and it is connected to described second channel and changes notifying device; One platform performance devices, it is connected to described second channel and changes decision maker; The second channel modifier, it is connected to described second channel and changes decision maker; Second transmitter/receiver, it is connected to described second channel change notifying device and described second channel modifier; One measurement report device, it is connected to described second transmitter/receiver; And second antenna, it is connected to described second transmitter/receiver.
Description of drawings
By the description of a hereinafter preferred embodiment, the example that is given, with reference to corresponding accompanying drawing, the utility model can obtain to understand in more detail, wherein:
Figure 1 shows that initial seamless channel change method flow diagram by AP;
Figure 2 shows that the signal flow graph of method shown in Figure 1;
Figure 3 shows that initial seamless channel change method flow diagram by a STA; And
Figure 4 shows that a system block diagrams, it is to be configured to implement a seamless channel change.
Embodiment
After this, proprietary term " platform (STA) ", it comprises but is not limited to, a wireless transmission/receive unit, user's equipment, a fixing or mobile subscriber unit, a calling set or any type of device that can operate under a wireless environment.When after this this paper mention proprietary term " access point (AP) ", it comprises but is not limited to, a platform, a Node B, a platform controller or any type of interface arrangement under wireless environment.
The utility model addresses the above problem, and it is by the hand-exchanging program of setting between between an AP and a STA, the STAs communication that wherein said AP is coupled, and it notify with switching channel, and wherein said STA confirms its general or the AP that will can not follow in new tunnel.This program guarantees that discernable all AP of all STAs change the notice of passages, and which STA AP also can know and can follow to new tunnel, and which STAs has followed the new tunnel that the AP decision changes.The utility model also solves problem by allowing the STA request channel to change to trigger hand-exchanging program.
Fig. 1 in order to simplify accompanying drawing and discussion of the present utility model, hereinafter only talks about a single S TA with the initial hand-exchanging program 100 of description of drawings AP of the present utility model, and principle of the present utility model is also applicable to the system of a plurality of STAs.
One AP sends channel change intent information to a STA, changes channel to channel X to indicate its intention, and wherein X represents gap marker symbol (step 102).This information also comprises the information about the channel change time, this information can use broadcast frame or clean culture to send frame to send, use the benefit of broadcast frame to be, when a plurality of STAs link to each other with described AP, the quantity that its restricted information sends on wireless medium, use the benefit of single broadcasting frame (one of the STA that each links to each other) to be, the robustness that it helps signal to send, because described AP can wait for the MAC ACK from STA, indicate described STA whether correctly to receive information, in the example of not receiving from the ACK of specific STA, AP can resend described channel change intent information.
According to the channel change intent information that receives, STA can judge whether will change its channel to described new channel (step 104) based on the wireless frequency environment of its performance, its present position and validity and the load of other APs in system.Described judgement can involve a multiple criteria determination procedure, for instance, first criterion that described STA can consider is, whether it has performance (considering the restriction of hardware and configuration) changes to passage X, as being declared by the channel change intent information that AP sent.STA may consider second and the 3rd criterion be the level of interference of STA and load on passage X.According to this kind criterion, described STA just determines whether need described channel change, and the multiple criteria analysis that this conclusion can use any row to be is reached, and it is will to calculate the mark that obtained and a predetermined level comparison based on weights and obtain.
In case make decision, STA just sends a channel change response message, it comprises a notice, notify described information to be received (also can be used for using in the example of broadcast transmission channel change intent information), and an indication, indicate described STA whether will follow described AP to new passage (step 106).
Indication in the channel change response message has comprised the response of different predefine, its including but not limited to:
1) described STA will follow described AP to new tunnel.
2) described STA will can not follow to new tunnel, and will be ready to continue to be served on the phase circulation passage by AP.If the scan performance or the STA that indicate new tunnel will reduce its usefulness or STA shortage change channel of STA judge that changing passage can't make the QoS demand of its application facet that satisfies the user, can improve just the probability of this situation then takes place.
3) STA will not follow AP to new passage, but can not ask AP to treat at identical passage.If STA has identified another candidate AP, and judge that it can provide than the better usefulness of existing AP on new tunnel, can improve just the probability of this situation then takes place.
STA can carry out the technical scope that channel change is judged, be included in to use on the new tunnel and measure or report quality yardstick (for example: signal noise ratio (SNR), signal interference and noise ratio (SINR), packet error (PER) or the like), and with these yardsticks and the quality scale ratio on existing channel, measured, or with predetermined level relatively.STA also uses on new tunnel and to measure or the load yardstick (for example: channel occupancy, medium access postpone or the like) of report, with load scale ratio measured on existing channel, or with predetermined level relatively.Also can use the weights benchmark combination of above-mentioned yardstick on new tunnel, compare with the weights benchmark combination of same scale on existing passage, or compare with predetermined level.
If AP uses its channel change intent information of broadcast transmission, also receive the purpose use of described channel change intent information by the described channel change response message that STA sent as affirmation.With the single broadcasting information sendaisle information of changing one's intention several benefits is arranged, because it allows AP to distinguish out the STA that does not receive the channel change intent information, and receive the channel change intent information but do not send the STA of described channel change response message, whether described APc can wait for the response (plus or minus) of all STAs or till expiring, then just make a determination with frequently
The band change continues, and AP also can not limited by the suggestion of STA.
According to the channel change response notice that receives from STA, whether described AP then decision will change described passage (step 108), this step allows described AP to consider the intention that it changes passage again, for instance, only serve a single STA and this STA indicates it not follow described AP to the example of new tunnel at AP, described AP may determine not carry out channel change, can help it to make better decision if AP believes measurement report, and this also is to measure to the STAs request to the AP chance.
Generally speaking, the judgement whether described AP continues channel change based on,, carry out of the influence of described channel change cause to service quality with prediction with the user's of the channel-changing information response of each pattern relative populations.Relatively the relative populations of each form response changes the program that target is made decision with the usefulness of predicting according to the described passage of switching, also is one of several possibility executive modes.
If described AP decision does not change channel, just program 100 stops (step 110).If the AP decision continues channel change (step 108), then it sends a channel change announcement information to the STA (step 112) that links to each other.This information also comprises the information about the channel-changing time, and this information can use broadcast frame or single broadcasting frame sends, and the advantage of each form is with mentioned above identical.
If the AP decision continues channel change, it can use the information that is contained in the channel-changing response message that is received from STA, and removing all belongs to response and does not follow the buffering package of AP to the STA of new tunnel, if STA does not follow AP to new tunnel, then this can prevent that a large amount of banded amount of AP waste is on unsuccessful transmission package.Described AP changes to new tunnel (step 114), and if STA follow described AP, described STA also changes to new tunnel (step 116).
The inessential step of a hand-exchanging program is, behind STA change passage, send a channel change and carry out information to described AP (step 118), this information also can be used for preventing that described AP waste frequency band is in transmit package to STA unsuccessfully, described STA indicates (in its channel change response message) will follow described AP to new tunnel, but can't reach.Follow described program and become termination (step 110).Figure 2 shows that system's 200 signal graphs of carrying out program shown in Figure 1, described system 200 comprises an AP 202 and a STA 204.Described AP 202 sends a channel change intent information 210, and it can be broadcasted or single broadcasting sends.Described STA 204 (or each STA 204, if it is coupled that its described AP 202 has a plurality of STAs) by send a channel change response message 212 to described AP 202 to respond described intent information 210, each STA 204 sends its echo message with single broadcasting information.
Take place if described frequency band changes, just described AP 202 sends a channel change announcement information 214 to described STA 204, as intent information 210, described announcement information 214 can broadcast message or the transmission of single broadcasting information.Described STA 204 can send a channel change according to the channel change of success and carry out information 216 to described AP 202, and it is a non-essential information.
Figure 3 shows that wherein a STA asks described AP to change its passage according to method 300 flow charts of the present utility model.In a preferred implementation, the utility model makes described STA ask it to change employed passage to described AP, and when the critical QoS to the user of interference that described STA suffered or channel-active power, the needs of this kind request just can rise.
Described STA sends with a single broadcasting frame and changes flexible road solicited message to its AP (step 302), described information can comprise following in some or all information: carry out the preferable channel table of time restriction, desire migration of described channel change and the interference on existing and candidate channel or noise grade and measure.
According to the information that is received, described AP then can take one or two action.If described AP has a plurality of coupled STAs, then it makes described AP begin to carry out hand-exchanging program 100, is begun by step 102.If it is coupled that described AP only has a single STA, then very can determine to continue described channel-changing program, and begin to carry out described program 100 by step 108.
In the flow process of the described any point of Fig. 1, described AP can take to measure on the passage of existing and recommendation, and/or the STA that requires the request channel to change measures.
Channel 4 is for being configured to carry out system's 400 schematic diagrames of a seamless channel change, and described system 400 comprises an AP 402 and a STA 404.Described AP 402 comprises a channel-changing notifying device 410, and a channel-changing decision maker 412, and it is to be connected to described channel-changing notifying device 410.One channel-changing device 414 is connected to described channel-changing decision maker 412.One measurement request device 416 is connected to described channel-changing decision maker 412.One transmitter/receiver 418 is to be connected to described channel-changing notifying device 410, described channel-changing device 414 and described measurement request device 416.One antenna 420 is connected to described transmitter/receiver 418.
Described STA 404 comprises a channel-changing notifying device 430, and a channel-changing decision maker 432, and it is to be connected to described channel-changing notifying device 430.One STA performance devices 434 is connected to described channel-changing decision maker 432.One channel-changing device 436 is connected to described channel-changing decision maker 432.One transmitter/receiver 438 is connected to described channel-changing notifying device 430 and described channel-changing device 436.One measurement report device 440 is connected to described transmitter/receiver 438.One antenna 442 is connected to described transmitter/receiver 438.
The 400 following runnings of described system.Described channel-changing notifying device 410 in described AP 402 sends described channel change intent information to described STA 404, is handled by channel-changing notifying device 430 in STA 404.Change in a STA initial channel under the situation of request, the described channel-changing notifying device 430 in described STA 402 at first sends described channel change solicited message to described AP 402, is handled by channel-changing notifying device 410 in AP 402.
After the described channel change intent information of described STA 404 receptions, described channel-changing decision maker 432 in described STA 404 judges just whether described STA changes its channel, and the information that described channel-changing decision maker 432 meeting accesses are stored in described STA performance devices 434 is made decision with help.In case described channel-changing decision maker 432 is made the decision about described channel change, it just sends a signal to described channel-changing notifying device 430, and it can be sent to described decision (via described channel change response message) the described channel-changing notifying device 410 in described AP 402.If described STA 404 desires change its channel, just then described channel-changing decision maker 4332 sends a signal to described channel-changing device 436 to change described passage.
In described AP 402, described channel-changing decision maker 412 is in order to judge whether described AP will change its passage.As mentioned above, the channel change response message that this decision can be subjected to being received from described STA 404 influences.Making aspect this decision, described channel-changing decision maker 412 can be to described STA 404 requests, and it is to reach via measurement request device 416.According to the measurement request that is received from described AP 402, described STA 404 takes suitable measurement, and gives described AP402 via described measurement report device 440 repayment.If described AP 402 desires change its channel, just described channel decision maker 412 sends a signal to channel-changing device 414 to change described passage.
Embodiment
A kind of have the method for seamless channel change among the WLAN of a STA and an AP one, and its step comprises: send a channel change intent information to described STA by described AP; Send a channel change response message to described AP by described STA, notify the described STA of described AP whether will follow described channel change; Judge whether carry out channel change in described AP; And if result of determination is for being then to carry out a channel change.
According to described method elder generation's the last period, wherein said channel change response message comprises an affirmation, and it confirms that described channel change intent information is received.
According to previous two sections described methods wherein, wherein said execution in step also comprises following steps: send a channel change announcement information to described STA by described AP; Go up the described passage of change in described AP and described STA; And send a channel change by described STA and carry out information to described AP, it is according to the successful execution of channel change.
According to first three section of elder generation described method wherein, wherein said WLAN comprises and surpasses one STA, and described execution in step will consider the quantity of the STAs that can change passage before the described channel change of execution.
According to the described method of first previous paragraphs, wherein said WLAN only comprises a STA, and described determination step comprises following steps: whether carry out described channel change by described AP decision; If desire is carried out described channel change, send a channel change announcement information to described STA by described AP; On described AP and described STA, change described passage.
According to the described method of previous arbitrary paragraph, its step also comprises: if described channel change is successfully finished, send a channel change by described STA and carry out information to described AP.
According to first three section of elder generation described method wherein, wherein said WLAN comprises and surpasses a STA, and described determination step comprises following steps: send a channel change intent information to every described STA by described AP; Whether support described channel change by every described STA decision; Send a channel change response message to described AP by every described STA; Judge whether carry out described channel change by described AP; If desire is carried out described channel change, send a channel change announcement information to every described STA by described AP; And on described AP and every described STA, change described passage.
According to previous four sections described methods wherein, its step also comprises: if described channel change is successfully finished, send a channel change by every described STA and carry out information to described AP.
A kind ofly comprise the system that carries out a seamless channel change among the WLAN of an AP and a STA one.Described AP is configured to send a channel-changing intent information to described STA.Described STA is configured to send a channel-changing response message to described AP, and described channel change response message comprises an indication, and it indicates described STA whether will follow described AP to a new tunnel.Described AP more be configured to receive described channel change response news known after, judge whether change its passage, and if be judged to be and be, just change its passage.
According to described system the last period, wherein said channel-changing response message comprises an affirmation, and it confirms that described channel change intent information is received by described STA.
According to previous two sections one section described systems wherein, if wherein described AP decision changes its passage, then described AP also is configured to send a channel-changing announcement information to described STA and change its passage; And described STA more is configured to change its channel, and sends a channel change and carry out information to described AP, and it is according to the successful execution of channel change.
According to first three section described system wherein of elder generation, wherein said WLAN comprises and surpasses one STA, and described AP will consider the quantity of the STAs that can change passage before the described channel change of execution.
A kind ofly comprise the system that carries out a seamless channel change among the WLAN of an AP and a STA one.Described STA is configured to send a channel-changing solicited message to described AP.Described AP is configured to judge whether can carry out described channel change, and carries out described channel change based on described decision.
According to the described method, system of first previous paragraphs, wherein said WLAN only comprises a STA; If desire is carried out described channel change, send a channel change announcement information to described STA by described AP; Described AP is configured to change its channel; And described STA is configured to change its channel.
According to previous two sections described systems wherein, if wherein described channel change is successfully finished, described STA more is configured to send a channel-changing and carries out information to described AP.
According to first three section described system wherein of elder generation, wherein said WLAN comprises and surpasses a STA; Described AP is configured to send a channel-changing intent information to every described STA; Every described STA is configured to decision and whether supports described channel change, and sends a channel change response message to described AP; Described AP is configured to judge whether carry out described channel change, and if desire carry out described channel change, just send a channel change announcement information, and change its passage to every described STA; And every described STA is configured to change its channel.
According to previous four sections described methods wherein, if wherein described channel change is successfully finished, every described STA more is configured to send a channel-changing and carries out information to described AP.
A kind ofly comprise the system that carries out a seamless channel change among the WLAN of an AP and a STA one.Described AP comprises the first channel-changing notifying device; The first channel-changing decision maker, it is connected to the described first channel-changing notifying device; The first channel-changing device, it is connected to the described first channel-changing decision maker; One measurement request device, it is connected to the described first channel-changing decision maker; First transmitter/receiver, it is connected to the described first channel-changing notifying device, the described first channel-changing device and described measurement request device; And first antenna, it is connected to described first transmitter/receiver.Described STA comprises second channel and changes notifying device; Second channel changes decision maker, and it is connected to described second channel and changes notifying device; One platform performance devices, it is connected to described second channel and changes decision maker; The second channel modifier, it is connected to described second channel and changes decision maker; Second transmitter/receiver, it is connected to described second channel and changes notifying device and described second channel modifier; One measurement report device, it is connected to described second transmitter/receiver; And second antenna, it is connected to described second transmitter/receiver.
According to described system elder generation's the last period, wherein the described first channel-changing notifying device in described AP is configured to send a channel-changing intent information to described platform.
According to previous two sections described systems wherein, wherein the described second channel in described platform changes notifying device, is configured to receive described channel-changing intent information.
According to first three section described system wherein of elder generation, wherein the described second channel in described platform changes notifying device, is configured to send a channel-changing solicited message to described AP.
According to previous four sections described systems wherein, wherein the described first channel-changing notifying device in described AP is configured to receive described channel-changing solicited message.
According to the first five section described system wherein of elder generation, wherein the described first channel-changing decision maker in described AP is configured to judge whether described AP will change its transmission channel.
According to the first six section described system wherein of elder generation, if wherein described AP will change its transmission channel, just the then described first channel-changing decision maker sends a signal to the described first channel-changing device, to change described transmission channel.
According to the first seven section described system wherein of elder generation, wherein the described first channel-changing decision maker in described AP sends a signal to described measurement request device, to measure to described platform request.
According to the first eight section described system wherein of elder generation, wherein said measurement report device is configured to carry out measurement and reports that described measurement is to described AP.
According to previous nine sections described systems wherein, wherein the described second channel in described platform changes decision maker, is configured to judge whether described platform will change its receive path.
According to previous ten sections described systems wherein,, just changing decision maker, then described second channel sends a signal to described second channel modifier, to change described receive path if wherein described platform will change its receive path.
Demonstration Application of the present utility model has comprised the field of load balance and dynamic channel selection, in these are used, needs described AP to change its passage and has become time dependent load of adaptation and disturbance state.The utility model allows to interrupt carrying out this kind channel change with the minimum service of the STAs that links to each other.
Although feature of the present utility model and assembly are all described in the particular combinations mode in embodiment, but each feature or assembly can use alone among the embodiment, and do not need further feature or combination of components with better embodiment, or with/do not do different combinations with further feature of the present utility model and assembly.Although the utility model has seen through preferred embodiment and described, the modification of desorption claim of the present utility model is not conspicuous concerning the personage who has the knack of this skill for other.Above-mentioned description is for the purpose of description, and can not limit special utility model by any way.
Claims (7)
1. system that carries out a seamless channel change in a WLAN is characterized in that this system comprises:
One access point comprises:
The first channel-changing notifying device;
The first channel-changing decision maker, it is connected to the described first channel-changing notifying device;
The first channel-changing device, it is connected to the described first channel-changing decision maker;
One measurement request device, it is connected to the described first channel-changing decision maker;
First transmitter/receiver, it is connected to the described first channel-changing notifying device, the described first channel-changing device and described measurement request device; And
First antenna, it is connected to described first transmitter/receiver;
One platform comprises:
Second channel changes notifying device;
Second channel changes decision maker, and it is connected to described second channel and changes notifying device;
One platform performance devices, it is connected to described second channel and changes decision maker;
The second channel modifier, it is connected to described second channel and changes decision maker;
Second transmitter/receiver, it is connected to described second channel and changes notifying device and described second channel modifier;
One measurement report device, it is connected to described second transmitter/receiver; And
Second antenna, it is connected to described second transmitter/receiver.
2. the system as claimed in claim 1 is characterized in that, the described first channel-changing notifying device in described access point is connected to described platform via sending a channel-changing intent information.
3. system as claimed in claim 2 is characterized in that, the described second channel in described platform changes notifying device and is connected to described access point via receiving described channel-changing intent information.
4. system as claimed in claim 1 or 2 is characterized in that, the described second channel in described platform changes notifying device and is connected to described access point via sending a channel-changing solicited message.
5. system as claimed in claim 4 is characterized in that, the described first channel-changing notifying device in described access point is connected to described platform via receiving described channel-changing solicited message.
6. the system as claimed in claim 1, it is characterized in that, the described first channel-changing decision maker in described access point is connected to this platform to measure to described platform request, and described measurement request device promptly is connected to described platform when receiving from this first channel-changing decision maker.
7. the system as claimed in claim 1 is characterized in that, described measurement report device is connected to described access point, to report described measurement to described access point.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US60876904P | 2004-09-10 | 2004-09-10 | |
| US60/608,769 | 2004-09-10 | ||
| US11/005,823 | 2004-12-07 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2877154Y true CN2877154Y (en) | 2007-03-07 |
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Family Applications (2)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200580030612 Pending CN101019443A (en) | 2004-09-10 | 2005-09-06 | Seamless channel change in a wireless local area network |
| CN 200520105339 Expired - Lifetime CN2877154Y (en) | 2004-09-10 | 2005-09-09 | System for seamles channel change in wireless local area network |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200580030612 Pending CN101019443A (en) | 2004-09-10 | 2005-09-06 | Seamless channel change in a wireless local area network |
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| Country | Link |
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| CN (2) | CN101019443A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102792721A (en) * | 2009-11-12 | 2012-11-21 | 法国电信 | Method for allocating data-transmission resources, and corresponding switching method, access point, terminal, computer program and signal |
| CN102833749A (en) * | 2011-06-14 | 2012-12-19 | 启碁科技股份有限公司 | Wireless communication method and system |
| CN104968023A (en) * | 2015-06-10 | 2015-10-07 | 小米科技有限责任公司 | Working channel adjusting method, device and equipment |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105636134A (en) * | 2012-08-03 | 2016-06-01 | 北京新岸线移动多媒体技术有限公司 | Channel switching method |
-
2005
- 2005-09-06 CN CN 200580030612 patent/CN101019443A/en active Pending
- 2005-09-09 CN CN 200520105339 patent/CN2877154Y/en not_active Expired - Lifetime
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102792721A (en) * | 2009-11-12 | 2012-11-21 | 法国电信 | Method for allocating data-transmission resources, and corresponding switching method, access point, terminal, computer program and signal |
| CN102792721B (en) * | 2009-11-12 | 2016-10-12 | 法国电信 | For the method distributing data transmission resources, and corresponding changing method, access point, terminal |
| CN102833749A (en) * | 2011-06-14 | 2012-12-19 | 启碁科技股份有限公司 | Wireless communication method and system |
| CN104968023A (en) * | 2015-06-10 | 2015-10-07 | 小米科技有限责任公司 | Working channel adjusting method, device and equipment |
| CN104968023B (en) * | 2015-06-10 | 2018-05-08 | 小米科技有限责任公司 | Working channel method of adjustment, device and equipment |
Also Published As
| Publication number | Publication date |
|---|---|
| CN101019443A (en) | 2007-08-15 |
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