CN101390407A - Wireless communication methods and components that implement handoff in wireless local area networks - Google Patents

Abstract

This invention relates to wireless local area networks, and particularly to the IEEE 802.11 family of standards. It consists of a method and apparatus that can be implemented in access points (APs) and subscriber wireless transmit/receive units (WTRUs), in order to allow an AP to initiate re-association of a WTRU to itself or a different AP. The invention improves the robustness of the network by enabling more efficient load balancing, congestion control, and roaming, without compromising the user experience.

Description

In radio area network, implement wireless communications method and the assembly of handing-over

Technical field

The invention relates to radio area network (WLANs) and impel wireless transmission/reception unit (WTRU) to switch to another and method and the device of " roaming " by the communication via Yi Ge communication station.Particularly, the present invention can by be configured as meet IEEE 802 standards WLANs operation WTRU and advantageously use, in this WTRUs can carry out with the radio communication of wlan access point (APs) and when the radio link from an AP switches to the radio link with another AP lasting radio communication.

Background technology

At wireless communication system in the art, for knowing, general, this germline turnkey is drawn together communication station, its transmission and receive wireless communication signals to each other.According to system form Er Ding， communication station, be typically one of them of wireless transmission/reception unit (WTRUs) of two kinds of patterns: a kind of form is base station, and another kind is subscriber unit, it is for movably.

Term base station as used herein includes, but not limited to base station, accessing points, Node B, base station controller or other interface arrangements or at the WTRU of wireless environment, it provides the accessing wirelessly of network that other WTRUs to AP correlate.

Title wireless transmission/reception unit as used herein (WTRU) includes, but not limited to subscriber equipment, mobile radio station, fixing or moving user unit, beeper or can be at any other form device of wireless environment operation.This kind of WTRUs comprises personal communicator, as the networking telephone of phone, video phone and the connection of tool network.In addition, WTRUs comprises Portable personal computing device, as the notebook computer of the wireless modem of PDAs and tool similar network capacity.The WTRUs that maybe can change position for Portable is called mobile unit.

Typically, provide the network of base station, wherein each base station can with suitable configuration WTRUs, and while radio communication is carried out in a plurality of suitable configurations base station.Some WTRUs are alternately configured as and carry out to each other directly radio communication, also, can be by the network delay via base station, this is commonly referred to as point to point wireless communication.When WTRU is configured as the situation with other WTRUs direct communications, itself is also configured as and function is used as base station, and WTRUs is configurable is for multi-channel network, tool network and point-to-point communication ability.

A wireless system for form, is called radio area network (WLAN), and configurable for carrying out and the radio communication that is equipped with the WTRUs of WLAN modem, it also can carry out the point-to-point communication with similar outfit WTRUs.At present, WLAN modem Wei You manufacturer is integrated into some traditional communication and calculation element, and for example, mobile phone, personal digital assistant and kneetop computer are manufactured together with one or more WLAN modem.

The universal WLAN environment with one or more WLAN base station, be typically called accessing points (APs), comprise the accessing points of setting up according to one or more IEEE 802 family's standards, access to these networks always needs user authentication process, the agreement of this kind of system is at present in the standardization of WLAN technical field, and a kind of this kind of protocol frame is with IEEE 802 family's canonical representations.

Basic service set (BSS) is the Foundation matrix of IEEE 802.11WLAN, and it comprises the WTRUs also referred to as station (STAs).One group of STAs that can talk to each other can form BSS, and multichannel BSS interconnects to form extended service set (ESS) via the frame shaped element that is called decentralized system (DS).Accessing points (AP), and is accessed when generally allowing by a plurality of STAs to this DS by providing DS service to provide to the WTRU of the access of this DS for a kind of.

With the WTRUs network in IEEE 802.11 environment point-to-point communication operations, on typical case, be called " with Italian type " pattern, also referred to as " independent BSS ", at independent BSS, two or more WTRUs set up communication between them and without the demand of reciprocity network element, without any need for AP-to-network foundation tissue.Yet AP is configurable to be acted at point-to-point communication in the way to do that for using with Italian type agreement and as WTRUs.Can be as to another network or to bridge or the router of world-wide web at this kind of situation AP.

The initial WTRU with Italian type network selects this with the operating parameter of Italian type network, for example services set identification code (SSID), channel and beacon sequential, and transmit this data in communication frame as beacon frame, when other WTRUs add this with Italian type network, they detect and use this selection with the operating parameter of Italian type network.

When using network foundation tissue and control radio communication via APs, parameter is stipulated by the network controller of this Aps of connection as SSID, and this APs disseminates beacon frame termly so that WTRUs can identify this Aps and attempt foundation and they communicate by letter.

At the SSID of IEEE802 base system, can be the 32 character unique identification codes that are attached to the packet header transmitting on WLAN, this SSID is then used as the password when WTRU attempt is connected to BBS or independent BBS, WTRU of this SSID difference and another, so all base stations and be connected to or attempt to be connected to the general identical SSID of use of every other device of specific WLAN, unless device does not generally allow to add BBS, it can provide correct SSID.

At AP-substrate W LAN, mobile WTRU wirelessly communicates by letter with specific AP when geographic service area at this AP, and this WTRU is called connection AP, through it carries out radio communication thus.Sometimes must or wish that WTRU changes the AP that it correlates, for example, this WTRU may experience poor signal conditioning because it moves and exceeds it and correlate the geographic area that AP serves.The demand that pass is connected to another AP also can cause because betiding being jammed of basic service set (BSS) that this AP serves.Re-connect also referred to as roaming, if particularly this WTRU tool is specified " family " AP (or Aps network) and followed " roaming " when this WTRU communicates by letter via different AP (or AP of heterogeneous networks).

At the WLANs that meets current IEEE 802.11 standards, WTRU is completely initial by this WTRU to re-connecting of new AP.For carrying out this, WTRU must first identify in its vicinity and can potentially provide to the APs of this WTRU network service.This is reached by scan method traditionally, and it can be active or passive.

In active scan, WTRU transmits exploration and requires one or more channel that will communicate by letter in this WTRU institute configuration, and this WTRU receives to explore in the APs responding from it and selects a new AP.In drive sweep, WTRU rests on it and can be used to attempt reception by the channel of APs (it provides this WTRU the to follow geographic location) beacon message packet that transmits, and this WTRU then selects a new AP in the APs of its reception beacon message packet.Can maintain the viewpoint of carrying out middle communication, particularly, when this WTRU moves, active and drive sweep all can spend the remarkable time.

Present inventor is cognitive wishes that AP re-connects the beginning of WTRU sometimes, for example, APs (or control some other nodes of the WTRU behavior) can be based on because correlating set amount and/or current " load " situation of the institute's form that communicates decision of wireless communications traffic of the WTRUs number of this AP.WTRU also can be positioned at the position of being served by several contiguous APs, and each AP can be used the different channels in one group of channel that WTRU can communicate by letter thereon.To an AP collective flow flux being quite high (high capacity) and in the situation that circulation of one or more contiguous APs be quite low (underload), wish that the one or more WTRUs that correlate this high capacity AP re-connect contiguous underload APs.

Yet, at the WLANs that meets current IEEE 802.11 standards, these only re-connect when the WTRUs of this high capacity of connection AP is equipped with complicated algorithm and make their circulations based at these channels estimate automatically to determine to provide re-connecting of AP to carry out when desired to other.Confirm that it is difficult that all WTRU are equipped with this kind of algorithm, and the design of this kind of algorithm and be embodied as very complex.Even providing all WTRU of geographic area operation to be all equipped with this kind of algorithm, guarantee that it is difficult that WTRUs can not re-connect to other APs in disorderly mode, this may cause the multichannel occurring back and forth between identical APs to re-connect.

For avoiding these problems, present inventor has considered potential workaround.For example, high capacity AP can be forcibly more separated through selecting WTRUs, wish another AP that these WTRUs can then find them and can re-connect.Also can indirectly by reducing its some key message bag transmitting, as the transmission power level of beacon or exploration reaction information bag, bring out separation.The problem of these isolation technics is for they can cause some WTRU user service disruption as unacceptable in the user of message or video signal in immediate service.This interruption is by WTRU, after separation, must be scanned to seek new AP and caused, this is a kind of method that spends the remarkable time.When considering whole problem, present inventor is cognitive be desirable to provide allow the initial WTRU of AP from an AP re-connecting and can not reduce performance to another.

Summary of the invention

The invention provides a kind of communication means, system and assembly, it comprises the talk step of shaking hands, it allows the WTRU communicating by letter with a network station via the first set of communication parameters to be handover to another network station of communicating by letter via second communication parameter group.Be preferably, original accessing points (AP) of radio area network (WLAN) requires or order WTRU is handover to target AP.As replacement scheme, original AP that the target AP of WLAN can require or order WTRU communicating by letter from this WTRU is handover to target AP.

Be preferably, in IEEE 802 form WLAN, in literary composition, provide four kinds of different events, it can be implemented individually or together with special WLAN combination, is called:

1. original AP requires WTRU to be handover to target AP, and this WTRU then determines whether join, and its decision of communicating by letter is to original AP.In the situation that this WTRU determines to join, this WTRU be its channel of this target AP re-configuration, BSSID, etc., and transmit to indicate and completed the confirmation message that re-connects to target AP.

2. original AP requires WTRU to be handover to target AP, this WTRU then for its channel of this target AP re-configuration, BSSID, etc., and transmit indication and completed the confirmation message that re-connects to target AP.

3. target AP order WTRU is handover to this target AP, this WTRU then notifies its its urgent handing-over of original AP communicating by letter, this WTRU be its channel of this target AP re-configuration, BSSID, etc., and transmit indication and completed the confirmation message that re-connects to target AP.

4. target AP requires WTRU to be handover to this target AP, and this WTRU determines whether join, and its decision of communicating by letter is to this target AP.In the situation that this WTRU determines to join, this WTRU notifies its its urgent handing-over of original AP communicating by letter, for its channel of this target AP re-configuration, BSSID, etc., and transmit indication and completed the confirmation message that re-connects to this target AP.

Understanding more in detail of the present invention can be obtained by the following narration of the preferred embodiment as example, and will understand together with reference to relevant drawings, and wherein similar elements represents with same numeral.

Accompanying drawing explanation

Fig. 1 is the system general view of explanation WLAN communication.

Fig. 2 is the figure of indication system according to the invention overview, and wherein mobile WTRU leaves the coverage of original AP and enters the coverage of target AP.

The figure that the signal that Fig. 3 is indication the first event exchanges, wherein original AP requires WTRU to be handover to target AP.

The figure that the signal that Fig. 4 is indication second event exchanges, wherein original AP order WTRU is handover to target AP.

The figure that the signal that Fig. 5 is indication the 3rd event exchanges, wherein target AP order WTRU is handover to target AP.

The figure that the signal that Fig. 6 is indication the 4th event exchanges, wherein target AP requires WTRU to be handover to target AP.

Embodiment

Title accessing points (AP), original AP, target AP and wireless transmission/reception unit (WTRU) are used as described above, the invention provides and have manyly through setting up the less radio-frequency accesses network of the APs of network organization, through any wireless network services thus, be provided for one or more WTRUs.When using in the lump with mobile WTRUs, the present invention is particularly useful.Because the geographic area that indivedual services that they are passed through is provided by indivedual APs are contained, it is integrated or through installing wireless WLAN device that this WTRUs can be had, as 820.11 (a), 820.11 (b), 820.11 (g) or 820.11 (n) conform to device with communication.Yet the present invention can be applicable to any wireless system.

Title re-connects requirements (DRRq) expression and is directed to WTRU and requires itself signal to communicate by letter as target AP with heterogeneous networks station of this WTRU re-configuration through guiding.In the interior literary composition of WLAN IEEE 802, this DRRq can be transmitted by original AP or target AP.

The information that is contained in this DRRq is preferably the data that comprise enough identification target AP and this WTRU is communicated by letter with this target AP, this information is preferably and comprises that the channel of this target AP, the identification code of this target AP (MAC Address, IP address, etc.), this target BSSID, this target AP capacity etc., this DRRq are preferably and also comprise about when dispatching the time sequence information of handing-over.The sign of time domain or particular value can be used for indication and represent that handing-over will start immediately.This DRRq also comprises that signal-customizing messages is as signalling step essential in exchange, and for example, whether this DRRq can indicate this target AP to wish to receive through guiding and re-connect confirmation, or whether this original AP wishes that reception re-connects indication through guiding.

In the situation that DRRq is sent by target AP, this target AP is preferably and uses the original AP communicating by letter with the same channel just being used by this WTRU and this WTRU to transmit this DRRq to this WTRU.In preferred embodiment, this DRRq is embodied as unicast frame, and more specific is control frame, for management frames or as the pay(useful) load of Frame.In substituting specific embodiment, this signals and also can use clean culture or broadcast message to implement.

Title re-connects reaction (DRRsp) and represents to transmit to this DRRq from this WTRU through guiding, and is directed to the signal of the network station of this DRRq of transmission.This DRRsp is preferably this WTRU of indication and whether accepts or refuse itself this requirement to communicate by letter as target AP with heterogeneous networks station of re-configuration.

Title re-connects order (DRCm) and represents that automatic network station is directed to the signal of WTRU through guiding, order this WTRU re-configuration itself to communicate by letter as target AP with heterogeneous networks station.In the interior literary composition of IEEE 802.11, this DRCm can be transmitted by original AP or target AP.Wish that this WTRU follows this DRCm and thereby do not need to transmit DRRsp to this network station that transmits this DRCm.This DRCm is preferably and comprises and the identical target AP information of above DRRq being narrated.

In the situation that DRCm is sent by target AP, this target AP is preferably and uses the original AP just communicating by letter with the same channel just being used by this WTRU and this WTRU to transmit this DRCm to this WTRU.In preferred embodiment, this DRCm is embodied as unicast frame, and more specific is control frame, for management frames or as the pay(useful) load of Frame.In substituting specific embodiment, this signals and also can use clean culture or broadcast message to implement.

Title through guide re-connect confirmation (DRCf) be illustrated in this WTRU re-configuration itself with after communicating by letter with this station from this WTRU to network station as the signal of target AP.This DRCf confirm this WTRU re-configuration itself, this DRCf be for prevent target AP this WTRU successfully re-connect to just start before this target AP to transmit packets of information to WTRU do not want event, this can cause target AP unnecessarily to transmit and transmit again frame to expect re-configuration itself to the WTRU of this target AP (but so not doing).This kind of situation, in the frame number of this target AP buffering, can be basic, and can be because of increasing exponentially close that connected with multiple transmits again retreat form and cause the reduction of wireless medium efficiency.And to re-connect in the wanted time of having a rest be successful DRCf if target AP does not receive indication, this target AP finally can disengage any Radio Resource that is preserved for this WTRU.

The information that is contained in this DRCf is preferably and comprises original AP, target AP that this WTRU of enough identification is communicating by letter and the data of this WTRU, in the interior literary composition of IEEE 802.11, this DRCf is preferably the indication that comprises each communication channel of using, identification code (MAC Address, IP address, etc.) of this target and original APs and the capacity of BSSID, this target and original APs, and this DRCf also comprises about when joining the time sequence information occurring.In preferred embodiment, this DRCf is embodied as unicast frame, and more specific is control frame, for management frames or as the pay(useful) load of Frame.In substituting specific embodiment, this signals and also can use clean culture or broadcast message to implement.

Title re-connects indication (DRI) and is illustrated in WTRU and by other stations, as target AP, has been required or ordered after re-configuration itself and this WTRU so carry out through guiding, and the network station of having communicated by letter to this WTRU from WTRU is as the signal of original AP.It itself is target AP by re-configuration that this DRI is preferably for original AP being indicated to this WTRU, and this DRI allows original AP stop transmitting packets of information to this WTRU (it can cause the inefficiency of wireless medium to use) and through buffer information bag, deliver to this target AP by any.This DRI also allows original AP to disengage to be preserved for any Radio Resource of this WTRU.

In the interior literary composition of IEEE 802.11, the information that is contained in this DRI is preferably and comprises that the channel of this target AP, the identification code of this target AP (MAC Address, IP address, etc.) and this target BSSID, this target AP capacity etc., this DRCf also comprise about when dispatching the time sequence information of handing-over.The sign of time domain or particular value can be used for indication and represent that handing-over will start immediately.In preferred embodiment, this DRI is embodied as unicast frame, and more specific is control frame, for management frames or as the pay(useful) load of Frame.In substituting specific embodiment, this signals and also can use clean culture or broadcast message to implement.

With reference to figure 1, illustrate WLAN wherein WTRUs via network station, carry out radio communication, be AP in the case, AP is connected to DS.This AP is depicted as with five WTRUs and communicates, and this kind of configuration is also referred to as the basic service set at WLAN Nei Wennei (BSS).Generally, this wlan system is supported WTRUs with different data rate, and in some cases, AP is configurable for supporting the WTRUs of a plurality of forms, as 802.11 (b) and 802.11 (g) WTRUs that conforms to.

With reference to figure 2, WLAN is illustrated as two APs of tool, is denoted as original and target.WTRUs is depicted as via this original AP and carries out radio communication, thus this WTRU be positioned over this WTRU be positioned over by this original AP and this target AP, served this WTRU of region may from this original AP " handing-over ", it be communicated to this target AP.

Traditionally at IEEE 802.11 WLAN, this WTRU can rise and start from this original AP and work as to the handover operation of this target AP, and for example, this WTRU starts to be moved further and leaves this original AP and when this target AP.To this kind of initial handing-over of WTRU, this handover operation must this WTRU for complete before outside this original AP scope to avoid by this WTRU performed carry out the interruption of radio communication.

According to the present invention, whether this WTRU is by allowing this APs also to determine and when to join should to occur and to be provided as tool further functional.This functional this WTRU that makes solves because of the problem of being jammed the various flows flux of the coverage of grooves or indivedual APs occurs individually.This to by make Payload balance and be jammed control that algorithm can be carried out and the steady key that do not need compromise user experience take to improve network as favourable.It also makes more effective roaming to carry out.According to the invention process, this original AP and/or this target AP can require and/or order this WTRU to be handover to this target AP.Be preferably, in IEEE 802 pattern WLAN, four different event of literary composition provide, and it can separately or merge implements for special WLAN.

With reference to Fig. 3, first event that illustrates requires this WTRU to be handover to this target AP in this this original AP, and this WTRU then determines whether join, and its decision of communicating by letter is to original AP.In the situation that this WTRU determines to join, this WTRU then for its channel of this target AP re-configuration, BSSID, etc., and transmit indication and completed the confirmation message that re-connects to this target AP.This re-configuration method itself is preferably substantially identical with for the initial handing-over of traditional WTRU, but one of them in this APs is preferably the re-configuration data that provide about this target AP in DRRq message.

As first step, this original AP determines that this WTRU should change direction to this target AP, this decision is based on comparing form and the amount in traffic that this original AP communicates with this target AP, this original AP then transmits DRRq and requires this WTRU to be handover to this target AP to this WTRU, this WTRU determines that whether accepting this changes direction requirement, and communicates by letter its decision to this original AP via DRRsp.This select to allow as this WTRU decision want service quality and whether can derive from this target AP.In the situation that this WTRU accepts to be handover to the requirement of this target AP, this WTRU re-configuration is originally as this target AP, and transmission confirms that the DCRf having joined is to this target AP.

With reference to Fig. 4, illustrate that second event is handover to target AP in this original AP order WTRU, based on this order, this WTRU be its channel of this target AP re-configuration, BSSID, etc., and transmit to indicate and completed the confirmation message that re-connects to this target AP.

In this event, when determining this WTRU, this original AP should change direction to this target AP, and the DCRm that this original this WTRU of AP transmission order is handover to this target AP is to this WTRU, and this WTRU re-configuration is originally as this target AP, and transmission DCRf is to this target AP.When using DCRm message, be preferably this WTRU before sending this kind of order and carry out the decision that wanted service quality can derive from this target AP.This kind of decision is based on deriving from this WTRU via signalling or the region customization data of this WTRU that the signal based on this WTRU receives certainly or measurement report calculate by this WTRU.

With reference to Fig. 5, the 3rd event that illustrates is handover to this target AP in this target AP order WTRU, this WTRU then notifies its urgent handing-over of original AP of its communication, for its channel of this target AP re-configuration, BSSID, etc., and transmit indication and completed the confirmation message that re-connects to this target AP.

In this event, this target AP is preferably and determines that this WTRU should change direction to this target AP, and this target AP can be as being configured as based on being directed to the interrupt signal from this WTRU of this original AP or carrying out the want decision that service quality can derive from this target AP based on obtaining via interruptions-AP signalling before sending this kind of order from this target AP of the measurement report of this original AP.If this WTRU is used oriented antenna to signal to this original AP in it, the interruption letter from this WTRU may not be effective.The DCRm that this WTRU of this target AP transmission order is handover to this target AP, to this WTRU, is preferably, and this target AP is used the channel that uses at that time of being communicated by letter via this original AP by this WTRU to transmit this DCRm.After transmitting this DCRm, the further communication between this target AP and this WTRU is preferably the channel of operation at this target AP.The DRI that this its meeting re-configuration of WTRU transmission communication is this target AP is to this original AP, and this WTRU follows re-configuration originally as this target AP, and transmits DCRf to this target AP, confirms that it joins.

With reference to Fig. 6, the 4th event that illustrates requires WTRU to be handover to this target AP in this target AP, and this WTRU determines whether join, and its decision of communicating by letter is to this target AP.In the situation that this WTRU determines to join, this WTRU notifies its its urgent handing-over of original AP communicating by letter, for its channel of this target AP re-configuration, BSSID, etc., and transmit indication and completed the confirmation message that re-connects to this target AP.

In the 4th event, this target AP determines that this WTRU should change direction to this target AP, be preferably, this target AP is used the channel just being used with this original AP signal post by this WTRU to transmit to require this DRRq that this WTRU is handover to this target AP to this WTRU, and this target AP then communicates by letter in the better channel of operation of this target AP with this WTRU.This WTRU determines that whether accepting this changes direction requirement, and it is communicated by letter via DRRsp, and it determines to this target AP, is preferably the channel of operation at this target AP.In the situation that this WTRU accepts to be handover to the requirement of this target AP, this WTRU transmits the DRI of its decision of communication to this original AP, is preferably at the original channel for communicating by letter with this original AP.This WTRU follows re-configuration originally as this target AP, and transmits and confirm that the DCRf having joined is to this target AP.

A replacement scheme of the 4th event for merge DRRsp and DRCf (or processing DRCf with DRRsp) in this this WTRU determine to accept from this target AP change direction requirement, this replacement scheme is eliminated the demand that this WTRU repeatedly switches between messaging parameter at during handover.This replacement scheme imply this original AP and this target AP all use same channel or, after transmitting this DRRq, this target AP still stays this original AP channel until it receives this DRCf.

Drive that this AP of handover procedure determines which AP be this target AP be applicable to or the method for the wishs pick AP of institute comprises, as, this WTRU propose to treat signalling between pick APs inventory, AP, in central authorities' decision of central controller execution, or any other appropriate method.

During enforcement, better WTRU comprises and being optionally configured as based on the initial message of AP via using first accessing points (AP) of the first set of communication parameters to implement transceiver and the processor of radio communication handing-over via the second accessing points (AP) of using second communication parameter group.This transceiver is preferably to be configured as and uses the first set of communication parameters reception to re-connect message, its identification the 2nd AP and second communication parameter group.This processor operations ground connection transceiver and being preferably is configured as optionally this transceiver of re-configuration and re-connects message and make this transceiver can use second communication parameter group to transmit re-configuration to confirm to the 2nd AP to communicate by letter to respond via second communication parameter group through receiving.Be preferably, this WTRU is configured as in conform to system operation of IEEE 802.11 this transceiver is configured as with the communication of predetermined frame form, and the message that re-connects of an AP is then preferably and is re-connecting that command frame receives and confirming re-connecting acknowledgement frame and transmit through guiding to the re-configuration of the 2nd AP through guiding certainly.

This WTRU, wherein this processor is configurable for re-connecting relevant the re-connecting of message (its 2nd AP that serves as reasons transmit re-connect order) and indicate message to an AP with processing through receiving to guide before via the communication of second communication parameter group this transceiver to transmit at this transceiver of re-configuration.In the situation of using this WTRU of predetermined frame form configuration to be the system operation that conforms at IEEE 802.11, this processor is preferably to be configured as and guides this transceiver to receive and re-connect message from the 2nd AP in re-connecting command frame through guide, in indicating frame transmission to re-connect indication to an AP through guiding to re-connect, and transmit re-configuration confirmation to the 2nd AP in re-connect acknowledgement frame through guide.

This WTRU processor is configurable re-connects requirement with the decision via the communication of second communication parameter group to respond through receiving about re-configuration for carrying out.At this kind of situation processor, being preferably to be configured as guides this transceiver in re-connecting reaction frame and re-connect requirement place and transmit and determine to make this processor guide this transceiver re-configuration for communicating by letter to re-connect the second communication parameter group of carrying out via determining to this AP by receiving this through guiding.When being used predetermined frame form, this WTRU is configured as the system operation that conforms at IEEE 802.11, this processor is preferably to be configured as and guides this transceiver to be received and re-connected requirement by an AP in re-connect requirement (DRRq) frame through guide, in re-connect reaction (DRRsp) frame through guide, use the first set of communication parameters to transmit the decision about re-connecting, and in re-connecting the confirmation of confirmation (DRCf) frame use second communication parameter group transmission re-configuration through guiding.

This WTRU processor can further be configured as guide this transceiver use second communication parameter group with transmit about process that the connection that received from the 2nd AP requires this through guiding re-configuration reaction message.When this determines to re-connect while processing, this processor is also configurable re-connects indication to an AP for guiding this transceiver to use the first set of communication parameters to transmit about what process that the decision receiving from the 2nd AP will process that the connection that re-connects requires.When being used predetermined frame form, this WTRU is configured as the system operation that conforms at IEEE 802.11, this processor is preferably to be configured as and guides this transceiver in re-connecting requirements (DRRq) frame and receive and re-connect requirement through guiding, in re-connecting indication (DRI) frame and transmit this and re-connect indication and in re-connecting the confirmation of confirmation (DRCf) frame transmission re-configuration through guiding through guiding.This WTRU processor is then also configurable for guiding this transceiver in re-connecting the decision of reaction (DRRsp) frame transmission about re-connecting through guiding before this DRI frame.

Enforcement at network side is preferably via WLAN APs is provided, its each comprise be optionally configured as assisting planting therewith WTRUs to or from transceiver and the processor of the handing-over of the radio communication of special APs.This AP transceiver is preferably to be configured as and uses the wireless network access that wireless transmission/reception unit (WTRUs) is provided through definition set of communication parameters.This AP processor be preferably be configured as use pre-handing-over parameter group carry out radio communication about being undertaken by WTRU from or to the decision of the handing-over of this AP.This processor is to be configured as when handing-over determines, guides this transceiver to transmit and re-connects message, and its use is pre-payed and connect set of communication parameters identification for joining AP and rear handing-over set of communication parameters.This AP transceiver be preferably that being configured as controls oneself and receive the WTRU re-connect message and to join receive this AP for by this WTRU, received re-connect message in identification for the re-configuration of the AP that joins, confirm.

For carrying out the enforcement of second event above, this AP is preferably and is configured as the conform to system operation at IEEE 802.11, and wherein this transceiver is to be configured as to use predetermined frame form in re-connecting command frame and transmit and re-connect message to WTRUs and in re-connecting acknowledgement frame and receive from the re-configuration of WTRUs and confirm through guiding through guiding.

This transceiver is configurable is from this WTRU, and it carries out radio communication via this AP, receives indication to re-connecting of another AP communication handing-over and indicates message to carry out the 3rd event.This processor is preferably to be configured as and disengages the resource of placing for re-connecting the communication of indication message about receiving this.Also for the carrying out of the 3rd event, this AP is preferably and is configured as the conform to system operation at IEEE 802.11, wherein this transceiver is that to be configured as with the communication of predetermined frame form and this processor be to be configured as to guide this transceiver in re-connecting command frame and transmit and re-connect message through guiding, in indicating frame reception to re-connect indication through guiding to re-connect, and confirm in re-connect acknowledgement frame reception re-configuration through guide.

For implementing the first event, this AP processor is preferably and is configured as when handing-over determine to determine, guides this transceiver to transmit to re-connect the form of requirement through receiving that to re-connect message and this transceiver be to be configured as to control oneself from this AP, to receive the WTRUs that re-connects requirement and receive reaction and through guiding, re-connect reaction message about what process that the reaction WTRU that re-connects determines.This AP be preferably be configured as IEEE 802.11 conform to system operation wherein this transceiver be to be configured as that to use predetermined frame form and this processor be to be configured as to guide this transceiver in re-connecting the transmission of requirements (DRRq) frame and re-connect requirement through guiding, in re-connecting the decision of reaction (DRRsp) frame reception about re-connecting through guiding, and in re-connecting the confirmation of confirmation (DRCf) frame reception re-configuration through guiding.

To the 4th event, this AP transceiver is preferably to be configured as and uses rear handing-over set of communication parameters to receive through guiding re-configuration reaction message, in this this AP processor, used and joined in advance set of communication parameters and guide this transceiver to transmit to re-connect message to WTRU, its identification for the AP that joins as this AP itself and identify this rear handing-over set of communication parameters as this first set of communication parameters.This AP transceiver be also preferably be configured as from the WTRU that carries out radio communication via this AP receive indication to another AP communication handing-over re-connect indication message and this processor is to be configured as to disengage the resource of placing for re-connecting the communication of indication message about receiving this.

To this first and the 4th event, this AP be preferably be configured as IEEE 802.11 conform to system operation wherein this transceiver be to be configured as to use predetermined frame form, this processor is preferably configured as and guides this transceiver to re-connect requirement in re-connect the transmission of requirement (DRRq) frame through guide, in re-connect indication (DRI) frame and receive and re-connect indication through guiding, in re-connecting that confirmations (DRCf) frame receives that re-configuration is confirmed and in re-connect the decision of reaction (DRRsp) frame reception about re-connecting through guide through guiding.

Specific embodiment

1. an accessing points (AP) comprises transceiver and processor.

2. the AP of any previous specific embodiment is for radio area network (WLAN).

3. the AP of any previous specific embodiment is the standard operation being configured as according to meeting IEEE 802.11 family's standards.

4. the AP of any previous specific embodiment is configured as with at least one wireless transmission/reception unit (WTRU) to communicate by letter.

5. the AP of any previous specific embodiment is configured as to use predetermined frame form.

6. the AP of any previous specific embodiment is configured as to assist to proceed to or from the handing-over of the radio communication via this AP.

The AP of any previous specific embodiment wherein this transceiver be to be configured as the wireless network access that uses the first set of communication parameters that at least one WTRU is provided.

The AP of any previous specific embodiment wherein this processor be configured as carry out about to or from the decision by the handing-over of the performed radio communication of WTRU via this AP, it uses and joins in advance set of communication parameters.

The AP of any previous specific embodiment wherein this processor be to be configured as when rear handing-over determines, to guide this transceiver to use to join in advance set of communication parameters to transmit to re-connect message, this message identification is used for joining AP and rear handing-over set of communication parameters.

The AP of any previous specific embodiment wherein this transceiver be configured as control oneself receive the WTRU re-connect message and to join receive this AP for by this WTRU, received re-connect message in identification for the re-configuration of the AP that joins, confirm.

The AP of 11. any previous specific embodiments is configured as in re-connect command frame transmission through guide to re-connect message to WTRU.

The AP of 12. any previous specific embodiments is configured as in re-connecting acknowledgement frame from the confirmation of WTRUs reception re-configuration through guiding.

The AP of 13. any previous specific embodiments is configured as from the WTRU that carries out radio communication via this AP to receive indication to re-connecting indication message via another AP communication handing-over.

The AP of 14. any previous specific embodiments is configured as to disengage to place for about receiving the resource that joins communication that re-connects indication message.

The AP of 15. any previous specific embodiments wherein this processor is to be configured as to guide this transceiver to re-connect message in re-connect command frame transmission through guide, in indicating frame reception to re-connect indication through guiding to re-connect, and confirm in re-connect acknowledgement frame reception re-configuration through guide.

The AP of 16. any previous specific embodiments wherein this processor is to be configured as when handing-over determine to determine, guides this transceiver to transmit to re-connect the form of requirement that to re-connect message and this transceiver be to be configured as to control oneself from this AP, to receive the WTRUs that re-connects requirement and receive reaction and through guiding, re-connect reaction message about what process that the reaction WTRU that re-connects determines.

The AP of 17. any previous specific embodiments is configured as in re-connect the transmission of requirement (DRRq) frame through guide to re-connect requirement, in re-connecting the decision of reaction (DRRsp) frame reception about re-connecting through guiding, and in re-connecting the confirmation of confirmation (DRCf) frame reception re-configuration through guiding.

The AP of 18. any previous specific embodiments is configured as to use rear handing-over set of communication parameters to receive through guiding re-configuration reaction message, in this this AP processor, used and joined in advance set of communication parameters and guide this transceiver to transmit to re-connect message to WTRU, its identification for the AP that joins as this AP itself and identify this rear handing-over set of communication parameters as the first set of communication parameters.

The AP of 19. any previous specific embodiments is configured as from the WTRU that just carries out radio communication via this AP, to receive indication and re-connect indication message to the communication handing-over via another AP.

The AP of 20. any previous specific embodiments is configured as to disengage the resource of placing the communication joining for re-connecting indication message about reception.

The AP of 21. any previous specific embodiments is configured as in re-connect the transmission of requirement (DRRq) frame through guide to re-connect requirement.

The AP of 22. any previous specific embodiments is configured as in re-connect indication (DRI) frame and receive this and re-connect indication through guiding.

The AP of 23. any previous specific embodiments is configured as in re-connecting the confirmation of confirmation (DRCf) frame reception re-configuration through guiding.

The AP of 24. any previous specific embodiments is configured as through guiding to re-connect the decision of reaction (DRRsp) frame reception about re-connecting.

25. 1 kinds of methods of carrying out the handing-over of the radio communication of the wireless transmission/reception unit (WTRU) to the 2nd AP via use second communication parameter group from the first accessing points (AP) via use the first set of communication parameters in radio area network (WLAN), the method comprises uses the first set of communication parameters transmission of identification the 2nd AP and second communication parameter group to re-connect message to this WTRU.

26. according to the method for specific embodiment 25, and it further comprises that the 2nd AP of use second communication parameter group receives re-configuration from this WTRU and confirms.

27. according to any method in specific embodiment 25-26, and wherein this WTRU is a kind of IEEE 802.11 that uses predetermined frame format operation system that conforms to.

28. according to any method in specific embodiment 25-27, wherein this to re-connect message be in re-connecting order that order (DRCm) frame transmits by an AP and re-configuration and be confirmed to be in re-connecting confirmation (DRCf) frame and received by the 2nd AP through guiding through guiding for a kind of.

29. according to any method in specific embodiment 25-28, wherein this to re-connect message be the order transmitting from the 2nd AP for a kind of, it is further included in and by the 2nd AP that uses second communication parameter group, receives re-configuration and by an AP, received and re-connected indication before confirming.

30. according to any method in specific embodiment 25-29, wherein this to re-connect indication be in re-connecting the reception of indication (DRI) frame through guiding.

31. according to any method in specific embodiment 25-30, and wherein this re-configuration is confirmed to be in re-connecting the reception of confirmations (DRCf) frame through guiding.

32. according to any method in specific embodiment 25-31, wherein this re-connects that to require be to be transmitted by an AP, it further comprises by this AP and receives and determine about the WTRU re-connecting, and this re-connects and requires thus AP in re-connecting reaction message and transmit through guiding.

33. according to any method in specific embodiment 25-32, and wherein this re-configuration confirms that the reception by the 2nd AP is only to complete determining to process while re-connecting.

34. according to any method in specific embodiment 25-33, and wherein this re-connects that to require be in re-connecting requirement (DRRq) frame and transmit from an AP through guiding.

35. according to any method in specific embodiment 25-34, about the decision re-connecting, is wherein to use this first set of communication parameters in re-connecting the reception of reaction (DRRsp) frame through guiding.

36. according to any method in specific embodiment 25-35, and wherein this re-configuration is confirmed to be and uses this second communication parameter group in re-connecting the reception of confirmations (DRCf) frame through guiding.

37. according to any method in specific embodiment 25-36, and wherein this re-connects that to require be to transmit from the 2nd AP, and it further comprises and uses this second communication parameter group to receive this through guiding re-configuration reaction message.

38. further comprise that according to the method for any in specific embodiment 25-37 using this first set of communication parameters to be received to re-connect by an AP is instructed in this decision and will processes and re-connect.

39. according to any method in specific embodiment 25-38, and wherein this re-connects that to require be in re-connecting the transmission of requirements (DRRq) frame through guiding.

40. according to any method in specific embodiment 25-39, wherein this to re-connect indication be in re-connecting the reception of indication (DRI) frame through guiding.

41. according to any method in specific embodiment 25-40, and wherein this re-configuration is confirmed to be in re-connecting the reception of confirmations (DRCf) frame through guiding.

42. according to any method in specific embodiment 25-41, about the decision re-connecting, is wherein in re-connecting the reception of reaction (DRRsp) frame through guiding.

43. according to the method for specific embodiment 42, and wherein this DRRsp frame is to receive before DRI frame.

44. 1 kinds of wireless transmission/reception units (WTRU) are comprised of transceiver and processor.

45. is for radio area network (WLAN) according to the WTRU of specific embodiment 44.

46. is the standard operation being configured as according to meeting IEEE 802.11 family's standards according to the WTRU of any in specific embodiment 44-45.

47. is to be configured as with at least one accessing points (AP) to communicate by letter according to the WTRU of any in specific embodiment 44-46.

48. is to be configured as to use predetermined frame form according to the WTRU of any in specific embodiment 44-47.

49. is to be configured as the handing-over of carrying out from via using first accessing points (AP) of the first set of communication parameters to the radio communication of the second accessing points (AP) via use second communication parameter group according to the WTRU of any in specific embodiment 44-48.

50. according to the WTRU of specific embodiment 49, and wherein this transceiver is to be configured as to use this first set of communication parameters reception to re-connect message, and it distinguishes the 2nd AP and this second communication parameter group.

51. according to any WTRU in specific embodiment 49-50, and wherein this processor is to be configured as optionally this transceiver of re-configuration via this second communication parameter group, to communicate by letter to respond through receiving and re-connect message and make this transceiver can use this second communication parameter group to transmit re-configuration to confirm to the 2nd AP.

52. according to any WTRU in specific embodiment 49-51, and wherein this transceiver is to be configured as in re-connecting command frame and receive and re-connect message from an AP through guiding.

53. according to any WTRU in specific embodiment 49-52, and wherein this transceiver is to be configured as in re-connecting acknowledgement frame and transmit re-configuration and confirm to the 2nd AP through guiding.

54. according to the WTRU of any in specific embodiment 49-53 be configured as via this this transceiver of second communication parameter group re-configuration, transmit before with communication about through receive re-connect message (it is treated to the order that re-connects being transmitted by the 2nd AP) through receiving, re-connect indication message to an AP.

55. is to be configured as in re-connecting command frame through guide to receive and re-connect message from the 2nd AP according to the WTRU of any in specific embodiment 49-54, in re-connect indication frame and transmit this and re-connect indication to an AP through guiding, and in re-connecting acknowledgement frame and transmit re-configuration and confirm to the 2nd AP through guiding.

56. is to be configured as to carry out requiring and to guide this transceiver to re-connect and require to receive in re-connecting reaction message and transmit this decisions and make this processor guide this transceiver to be configured as via decision to the 2nd AP will to process and re-connect this second communication parameter group communication of carrying out through guiding from this to communicate by letter via this second communication parameter group to respond through receiving to re-connect about the decision of re-configuration according to the WTRU of any in specific embodiment 49-55.

57. is to be configured as in re-connect requirements (DRRq) frame and AP reception re-connects requirement through guiding according to the WTRU of any in specific embodiment 49-56, use this first set of communication parameters in re-connecting the decision of reaction (DRRsp) frame transmission about re-connecting through guiding, and use this second communication parameter group to transmit this re-configuration confirmation in re-connect confirmation (DRCf) frame through guide.

58. according to the WTRU of any in specific embodiment 49-57 be configured as transmit about process that the connection that receives from the 2nd AP requires through guiding re-configuration reaction message.

59. according to the WTRU of any in specific embodiment 49-58 be configured as guide this transceiver use this first set of communication parameters transmit about process from the 2nd AP in this decision to process re-connect that received connection requires re-connect indication to an AP.

60. is to be configured as in re-connect requirements (DRRq) frame and receive and re-connect requirement through guiding according to the WTRU of any in specific embodiment 49-59, in re-connecting indication (DRI) frame and transmit this and re-connect and indicate and transmit this and re-connect confirmation in re-connect confirmation (DRCf) frame through guide through guiding.

61. is to be configured as before DRI frame in re-connecting the decision of reaction (DRRsp) frame transmission about re-connecting through guiding according to the WTRU of any in specific embodiment 49-60.

62. 1 kinds of methods that WTRU carry out certainly extremely joining via the radio communication of using the 2nd AP of second communication parameter group via an AP who uses the first set of communication parameters in WLAN, it this first set of communication parameters reception that comprises use identification the 2nd AP and this second communication parameter group re-connects message.

63. according to the method for specific embodiment 62, and it further comprises that re-configuration is with the WTRU via this second communication parameter group communication.

64. according to any method in specific embodiment 62-63, and it further comprises that using this second communication parameter group to transmit re-configuration confirms to the 2nd AP.

65. according in specific embodiment 62-64 any method wherein this to re-connect message be the order for an AP receives certainly.

66. according in specific embodiment 62-65 any method wherein this WTRU be configured as to use predetermined frame form to meet system operation in IEEE 802.11.

67. according in specific embodiment 62-66 any method wherein this to re-connect order be in re-connect order (DRCm) frame and receive through guiding, and re-configuration is confirmed to be in re-connecting the transmission of confirmations (DRCf) frame through guiding.

68. according to any method in specific embodiment 62-67, wherein this to re-connect message be the order receiving from the 2nd AP for a kind of, it further comprises that re-configuration is to re-connect indication to an AP via transmitting before this second communication parameter group communication.

69. according to any method in specific embodiment 62-68, wherein re-connecting order is in re-connecting the reception of order (DRCm) frame through guiding, re-connecting indication is in re-connecting the transmission of indication (DRI) frame through guiding, and re-configuration is confirmed to be in re-connecting the transmission of confirmation (DRCf) frame through guiding.

70. according to any method in specific embodiment 62-64, wherein this to re-connect message be to be a kind of requirement, it further comprises that this WTRU processes this and re-connects requirement by carrying out decision about re-connecting.

71. according to the method for specific embodiment 70, and it further comprises that this WTRU re-connects and requires in re-connecting reaction message and transmit this decision to this AP through guiding by receiving this.

72. further comprise that according to the method for any in specific embodiment 70-71 this WTRU re-configuration is will process this second communication parameter group communication re-connecting via this decision.

73. according to any method in specific embodiment 70-72, wherein this re-connects that to require be in re-connecting requirement (DRRq) frame and receive from an AP through guiding, about the decision re-connecting, be to use this first set of communication parameters in re-connecting reaction (DRRsp) frame and transmit through guiding, and this re-connect to be confirmed to be and uses this second communication parameter group in re-connecting the transmission of confirmation (DRCf) frame through guiding.

74. according to any method in specific embodiment 70-73, and wherein this re-connects that to require be to receive from the 2nd AP, and it further comprises that this WTRU is used this second communication parameter group to transmit this through guiding re-configuration reaction message.

75. further comprise that according to the method for any in specific embodiment 70-74 this WTRU is used this WTRU to determine to process this first set of communication parameters re-connecting and transmits and re-connect indication to an AP.

76. according to any method in specific embodiment 70-75, wherein this re-connects that to require be in re-connecting the reception of requirements (DRRq) frame through guiding, this re-connects indication is in re-connecting the transmission of indication (DRI) frame through guiding, and this re-configuration is confirmed to be in re-connecting the transmission of confirmation (DRCf) frame through guiding.

77. according to any method in specific embodiment 70-76, wherein about the decision re-connecting be before DRI frame by this WTRU in re-connecting the transmission of reaction (DRRsp) frame through guiding.

Although feature of the present invention and element are to combine to be especially described in preferred embodiment, each feature or element can be used alone other features and the element of preferred embodiment (do not have) or with tool or do not have other features of the present invention and the various of element and be used in combination.

Claims (40)

1. the method that user radio transmitting/receiving unit (WTRU) is carried out the handing-over of the radio communication to the 2nd AP via a use one second communication parameter group from the first accessing points (AP) via use one first set of communication parameters in radio area network (WLAN), the method comprises:

Use this first set of communication parameters reception one of identification the 2nd AP and second communication parameter group to re-connect message;

Re-configuration is to communicate via this second communication parameter group; And

Use this second communication parameter group that one re-configuration is confirmed to be sent to the 2nd AP.

2. method according to claim 1, it is characterized in that this re-connects message is a kind of order receiving from an AP, this WTRU is configured as to use predetermined frame form and operate in an IEEE 802.11 conforms to system, this re-connects order is to receive to re-connect order (DRCm) frame once guide, and this re-configuration is confirmed to be to re-connect once guide in confirmation (DRCf) frame and transmits.

3. method according to claim 1, it is characterized in that this re-connects message is a kind of order receiving from the 2nd AP, it is further included in re-configuration and re-connects indication to an AP to transmit one before communicating via this second communication parameter group.

4. method according to claim 3, it is characterized in that this WTRU is configured as to use predetermined frame form to operate in an IEEE 802.11 conforms to system, wherein this to re-connect order be to receive to re-connect order (DRCm) frame once guide, this re-connects indication is to transmit in re-connect indication (DRI) frame once guide, and this re-configuration is confirmed to be once guide, to re-connect the transmission of confirmation (DRCf) frame.

5. method according to claim 1, is characterized in that this re-connects message is a requirement, and it further comprises:

By making one, about the decision re-connecting, process this and re-connect requirement;

In re-connect reaction message once guide, certainly receive this and re-connect requirement place and transmit this decision to this AP; And

Re-configuration is to re-connect with this this second communication parameter group communication of carrying out via decision.

6. method according to claim 5, it is characterized in that this WTRU is configured as to use predetermined frame form with the system operation that conforms at IEEE 802.11, and this re-connects and requires to be received from an AP to re-connect requirement (DRRq) frame once guide, about this decision re-connecting, be to use this first set of communication parameters to transmit to re-connect once guide in reaction (DRRsp) frame, and this re-configuration is confirmed to be and uses this second communication parameter group, to re-connect once guide in confirmation (DRCf) frame, transmit.

7. method according to claim 5, is characterized in that this re-connects requirement is to receive from the 2nd AP, and it further comprises that using this second communication parameter group to transmit this reacts message through guide re-configuration.

8. method according to claim 7, is characterized in that further comprising with determining that re-connecting this first letter parameter group of carrying out with this re-connects indication to an AP.

9. method according to claim 8, it is characterized in that this WTRU is configured as to use predetermined frame form to operate in an IEEE 802.11 conforms to system, this re-connects and requires is to receive to re-connect requirement (DRRq) frame once guide, this re-connects indication is to transmit to re-connect indication (DRI) frame once guide, and this re-configuration is confirmed to be in re-connect the transmission of confirmation (DRCf) frame once guide.

10. method according to claim 9, is characterized in that this decision about re-connecting is to re-connect reaction (DRRsp) frame once guide, to transmit before DRI frame.

11. 1 kinds of wireless transmission/reception units (WTRU), for a radio area network (WLAN) and also for carrying out the handing-over of the radio communication to the 2nd AP via a use one second communication parameter group from the first accessing points (AP) via use one first set of communication parameters, this WTRU comprises:

One transceiver, is configured as by this first set of communication parameters and re-connects message, and it identifies the 2nd AP and this second communication parameter group; And

One processor, relevant to this transceiver operations, respond once reception and re-connect message and this transceiver of re-configuration optionally, to communicate via this second communication parameter group, make this transceiver to transmit a re-configuration by this second communication parameter group and confirm to the 2nd AP.

12. WTRU according to claim 11, it is characterized in that it is configured as in an IEEE 802.11 meets in system and operates, wherein this transceiver is to be configured as to use predetermined frame form, in re-connect command frame once guide, from an AP, receive this and re-connect message, and this re-configuration is confirmed to be sent to the 2nd AP re-connecting acknowledgement frame once guide.

13. WTRU according to claim 11, it is characterized in that this processor is to be further configured as at this transceiver of re-configuration with before communicating via this second communication parameter group, guide this transceiver to re-connect relevant one the re-connecting indication message and be sent to an AP of message with processing once reception, what its 2nd AP that serves as reasons transmitted one re-connects order.

14. WTRU according to claim 13, it is characterized in that it is configured as in an IEEE 802.11 conforms to system operates, wherein this transceiver is to be configured as to use predetermined frame form, and this processor is to be configured as to guide this transceiver to receive from the 2nd AP and one re-connect message, transmit this and re-connect indication to an AP in re-connect indication frame once guide in re-connect command frame once guide, and Yu Jingyi guides and re-connects acknowledgement frame and transmit this re-configuration and confirm to the 2nd AP.

15. WTRU according to claim 11, it is characterized in that this processor is to be further configured as to make one and with the decision communicating via this second communication parameter group, to respond once reception, re-connect requirement about re-configuration, and guide this transceiver certainly to receive this in re-connect reaction message once guide to re-connect requirement place and transmit this decision to this AP, make this processor guide this transceiver re-configuration, to communicate via this second communication parameter group, wherein this decision is for re-connecting.

16. WTRU according to claim 15, it is characterized in that it is configured as in an IEEE 802.11 conforms to system operates, wherein this transceiver is to be configured as to use predetermined frame form, and this processor is to be configured as to guide this transceiver to re-connect requirement in re-connect requirement (DRRq) frame once guide from an AP reception one, use this first set of communication parameters to transmit this decision about re-connecting in re-connect reaction (DRRsp) frame once guide, and use this second communication parameter group to transmit re-configuration confirmation in re-connect confirmation (DRCf) frame once guide.

17. WTRU according to claim 15, is characterized in that this processor is to be configured as to guide this transceiver to use this second communication parameter group, to transmit and to process the connection being received from the 2nd AP and require relevant this through guiding re-configuration reaction message.

18. WTRU according to claim 17, it is characterized in that this processor is to be configured as to guide this transceiver to use this first set of communication parameters transmission to require relevant re-connecting to indicate to an AP with processing the connection receiving from the 2nd AP, wherein this decision is for re-connecting.

19. WTRU according to claim 18, it is characterized in that it is configured as in an IEEE 802.11 conforms to system operates, wherein this transceiver is to be configured as to use predetermined frame form, and this processor is to be configured as to guide this transceiver to receive and one re-connect requirement, transmit this and re-connect indication in re-connect indication (DRI) frame once guide in re-connect requirements (DRRq) frame once guide, and transmit this re-configuration confirmation in re-connect confirmation (DRCf) frame once guide.

20. WTRU according to claim 19, is characterized in that this processor is to be configured as, and before this DRI frame, guide this transceiver to transmit this decision about re-connecting in re-connect reaction (DRRsp) frame once guide.

21. 1 kinds of methods of carrying out the radio communication handing-over of wireless transmission/reception unit (WTRU) in radio area network (WLAN), this handing-over be from via first accessing points (AP) of use one first set of communication parameters to the 2nd AP via a use one second communication parameter group, the method comprises:

By this first set of communication parameters of identification the 2nd AP and second communication parameter group, re-connect message to this WTRU; And

By the 2nd AP, using this second communication parameter group to receive a re-configuration from this WTRU confirms.

22. methods according to claim 21, it is characterized in that this WLAN is the IEEE 802.11 of the use predetermined frame format operation system that conforms to, wherein this to re-connect message be a kind of in the order that re-connects order (DRCm) frame once guide and transmitted by an AP, and this re-configuration is confirmed to be in re-connect confirmation (DRCf) frame once guide and is received by the 2nd AP.

23. methods according to claim 21, it is characterized in that this re-connects message is a kind of order transmitting from the 2nd AP, it re-connects indication by an AP reception one before being further included in and receiving a re-configuration confirmation by the 2nd AP that uses this second communication parameter group.

24. methods according to claim 23, it is characterized in that this WLAN is the IEEE 802.11 of the use predetermined frame format operation system that conforms to, wherein this to re-connect order be to transmit in re-connect order (DRCm) frame once guide, this re-connects indication is to receive in re-connect indication (DRI) frame once guide, and this re-configuration is confirmed to be in re-connect the reception of confirmation (DRCf) frame once guide.

25. methods according to claim 21, is characterized in that this re-connects message is a kind of requirement being transmitted by an AP, and it further comprises:

By this AP, received and determined about the WTRU re-connecting, this re-connects and requires is to transmit to re-connect reaction message once guide from this AP; And

Should only be confirmed to be and complete when determining to re-connect by reception one re-configuration of the 2nd AP.

26. methods according to claim 25, it is characterized in that this WLAN is a kind of IEEE 802.11 that uses predetermined frame format operation system that conforms to, wherein this re-connects and requires to be transmitted to re-connect requirement (DRRq) frame once guide from an AP, about this decision re-connecting, be to use this first set of communication parameters, to re-connect reaction (DRRsp) frame once guide, received, and this re-configuration is confirmed to be and uses this second communication parameter group, to re-connect confirmation (DRCf) frame once guide, received.

27. methods according to claim 25, is characterized in that this re-connects requirement is to transmit from the 2nd AP, and it further comprises that by this second communication parameter group, receiving this reacts message through guide re-configuration.

28. methods according to claim 27, is characterized in that it further comprises this first set of communication parameters of use and re-connects indication by an AP reception one, and wherein this decision is for re-connecting.

29. methods according to claim 28, it is characterized in that this WLAN is a kind of IEEE 802.11 that uses predetermined frame format operation system that conforms to, wherein this re-connects that to require be to re-connect the transmission of requirements (DRRq) frame once guide, this re-connects indication is to receive to re-connect indication (DRI) frame once guide, and this re-configuration is confirmed to be once guide, to re-connect the reception of confirmation (DRCf) frame.

30. methods according to claim 29, is characterized in that this decision about re-connecting is before this DRI frame, to re-connect reaction (DRRsp) frame once guide, receive.

31. 1 kinds of accessing points for radio area network (WLAN) (AP), it is configured as assists to this accessing points or from the carrying out of the radio communication handing-over of this accessing points (AP), this AP comprises:

One transceiver, it is configured as by one first set of communication parameters provides wireless network access to wireless transmission/reception unit (WTRU);

One processor, be configured as make about to or certainly the handing-over of this AP by using a decision that joins in advance the performed radio communication of the WTRU of parameter group;

This processor is to be configured as, and when making, guides this transceiver to use this to join in advance set of communication parameters to transmit one and re-connect message, AP and the rear handing-over set of communication parameters of its identification one for joining when a handing-over determines; And

This transceiver is to be configured as from receiving one to re-connect message and the WTRU that joining receives a re-configuration and confirms, wherein this AP for by this WTRU, received re-connect message in for joining this identified AP.

32. AP according to claim 31, it is characterized in that it is to be configured as in an IEEE 802.11 conforms to system to operate, wherein this transceiver is to be configured as to use a predetermined frame form to re-connect message to WTRUs to re-connect command frame transmission once guide, and from WTRUs, receives re-configuration confirmation to re-connect acknowledgement frame once guide.

33. AP according to claim 31, it is characterized in that this transceiver be configured as from a WTRU who is carrying out a radio communication via this AP receive an indication to the handing-over via another AP communication re-connect indication message, and this processor be configured as disengage for this signal post distribute and with receive this again this connection indicate the resource of the relevant communication of message.

34. AP according to claim 33, it is characterized in that it is to be configured as in an IEEE 802.11 conforms to system to operate, wherein this transceiver is to be configured as with a predetermined frame form communication, and this processor be configured as guide this transceiver with through guide re-connect command frame transmit re-connect message, to re-connect indication frame and receive and re-connect indication through guiding, and to re-connect acknowledgement frame and receive re-configuration and confirm through guiding.

35. AP according to claim 31, it is characterized in that this processor is to be configured as, when making a handing-over decision, guide this transceiver to re-connect message with a form that re-connects requirement, and this transceiver is to be configured as from receiving a WTRUs who re-connects requirement from this AP to receive once guide and re-connect reaction message, the reaction WTRU decision of this reaction about re-connecting.

36. AP according to claim 35, it is characterized in that it is configured as in an IEEE 802.11 conforms to system operates, wherein this transceiver is to be configured as to use predetermined frame form, and this processor be configured as guide this transceiver with through guide re-connect requirements (DRRq) frame transmit re-connect requirements, to re-connect reaction (DRRsp) frame and receive the decision about re-connecting through guiding, and to re-connect the confirmation of confirmation (DRCf) frame reception re-configuration through guide.

37. AP according to claim 35, it is characterized in that this transceiver is to be configured as by rear handing-over set of communication parameters to receive once guiding re-configuration reaction message, wherein this AP processor use one join in advance set of communication parameters guide this transceiver transmit one re-connect message to identification for the AP that joins as this AP itself and identify this rear handing-over set of communication parameters as the WTRU of this first set of communication parameters.

38. according to the AP described in claim 37, it is characterized in that this transceiver is to be configured as from just carrying out the WTRU reception one of a radio communication via this AP to re-connect indication message, this re-connects the indication of indication message to a handing-over of the communication via another AP, and this processor is to be configured as the resource of disengaging for this signal post distributes and this re-connects the relevant communication of indication message with reception.

39. according to the AP described in claim 38, it is characterized in that it is to be configured as in an IEEE 802.11 conforms to system to operate, wherein this transceiver is to be configured as to use predetermined frame form, and this processor is to be configured as to guide this transceiver to re-connect requirements (DRRq) frame and transmit and re-connect requirement through guiding, to re-connect indication (DRI) frame and receive this and re-connect indication and to re-connect the confirmation of confirmation (DRCf) frame reception re-configuration through guiding through guiding.

40. according to the AP described in claim 39, it is characterized in that this processor is to be configured as to guide this transceiver to re-connect the decision of reaction (DRRsp) frame reception about re-connecting through guiding.

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