CN101669335A - Radio link and handoff failure are handled - Google Patents

Abstract

Disclosed method and apparatus is used for handling RL and handoff failure based on context transfer details and the RACH process that has strengthened the failure processing procedure.After RL failure, subscriber equipment (UE) comprises the UE sign and as the enhancement mode Node B (e Node B) of the information element (IE) in RRC connection request and/or cell update message or any other RRC message and/or the sign of sub-district.

Description

Radio link and handoff failure are handled

Technical field

The present invention relates to wireless communication system.

Background technology

In the 2nd stage of evolved universal terrestrial radio access network (E-UTRAN), will list as further research (FFS) in the situation that radio link (RL) failure back wireless transmission receiving element (WTRU) selects to belong to the sub-district of same e Node B.It was suggested if WTRU selects different sub-districts from same e Node B, then do not had the mutual activity between WTRU and the e Node B to be resumed.Current, radio access network 2 (RAN2) is if regulation WTRU selects the sub-district from different e Node B, and then it need be controlled (RRC) and becomes the free time by radio resource.

Current, be based on about the RAN2 decision of RL failure that two stages determine.The behavior that these two stage managements and RL failure is associated, and show at Fig. 1.

When detecting radio problem, the phase I, this phase I has caused the RL failure detection.Thus, not based on timer or other (for example, counting) standard (T ₁) the mobility based on WTRU.

When detecting the radio link failure, second stage begins, and this second stage has caused the RRC free time.Mobility based on WTRU remains effectively, and it is based on (the T of timer ₂).

Following table 1 described about RL fail mobility current how processedly be.

Table 1: mobility and radio link failure

Situation	Phase I	Second stage	??T 2Stop
				UE returns same sub-district	As taking place, radio problem do not continue	Not having the mutual activity between UE and the e Node B not to be resumed, is FFS with the process of using, usually not by RRC_IDLE (RRC_ free time)	Pass through RRC_IDLE
UE selects different sub-districts from same e Node B	??N/A	??FFS	Pass through RRC_IDLE
				UE selects the sub-district of different e Node B	??N/A	Pass through RRC_IDLE	Pass through RRC_IDLE

Recently propose switching is divided into two (2) stages that are similar to the RL failure, and advise similar handoff failure processing procedure.

In the phase I, WTRU manages synchronously and inserts Target cell, as at timer T ₁During this time.In second stage, after the handoff failure, WTRU just interrupted switching and manage to rebuild lost with being connected of network, for example, at timer T ₂During this time.After second stage, UE enters RRC_IDLE.

Fig. 2 showed according to current two stages that are proposed in the activity that is associated with handoff failure by management during the mobility of network control.

Phase I is when starting from attempting for the first time Target cell synchronous; And cause handover failure detection.At this time durations, based on the mobility of WTRU, it is not based on (the T of timer or other (for example counting) standard ₁).

When second stage started from handover failure detection, it had caused RRC_IDLE.Based on timer (T ₂), remain effective based on the mobility of WTRU.

How processed table 2 has been described about the handoff failure mobility is.

Table 2: mobility and handoff failure

Situation	Phase I	Second stage	??T 2Stop
				UE target approach sub-district	As taking place, do not continue radio	Do not have the mutual activity between UE and the e Node B not to be resumed, UE carries out random access procedure according to 10.1.5	Pass through RRC_IDLE
UE returns the cell-of-origin	??N/A	Do not have the interacting activity between UE and the e Node B not to be resumed, carry out the process that inserts at random according to 10.1.5 UE	Pass through RRC_IDLE
				UE selects different sub-districts but not target or cell-of-origin	??N/A	Pass through RRC_IDLE	Pass through RRC_IDLE

And inserting at random based on uncontested between transfer period used in current permission.Similarly, current being included in the down link (DL) based on uncontested random access procedure that shows among Fig. 3 distributes random access preamble via dedicated signaling, wherein the e Node B is distributed the nothing dispute random access preamble (that is, not at the random access preamble within the set of being broadcasted on the BCH) of six (6) bits to WTRU.Under the situation that the DL data arrive, described preamble uses medium access controls (MAC) signaling (for example, layer 1 (L1)/layer 2 (L2) control channel or MAC control Packet Data Unit (PDU)) via being sent with switching (HO) instruction that is used to switch by also sending from source e Node B of target e Node B generation.

Then, WTRU transmits the nothing dispute random access preamble that is assigned with on RACH in up link.Accidental access response from eNB sends on DL-SCH.This response (is in the variable window of one or more Transmission Time Intervals (TTI) in size) and message 1 half synchronously and be sent to C-RNTI or RA-RNTI (FFS) on the L1/L2 control channel.

Accidental access response comprises timing allocation information and the initial UL permission that is used to switch at least and is used for the timing allocation information that the DL data arrive.In addition, RA preamble identifier is sent to Routing Area radio net temporary identifier (RA-RNTI) on the L1/L2 control channel.

If this response is sent to sub-district RNTI (C-RNTI) on the L1/L2 control channel, then this response is only used for a WTRU in a downlink sharied signal channel (DL-SCH) message, if perhaps this response is sent to RA-RNTI on the L1/L2 control channel, then should response use for the one or more WTRU in the DL-SCH message.

Need a kind of improved method and apparatus that is used to handle radio link and handoff failure.

Summary of the invention

Disclosed method and apparatus is used for handling RL and handoff failure based on context transfer details and RACH process, and this RACH process has strengthened the failure processing procedure.After the RL failure, wireless transmission receiving element (WTRU) comprises WTRU sign and the evolved Node B (eNB) of the information element (IE) of conduct in RRC connection request and/or cell update message or any other RRC message and/or the identifier of sub-district.

Description of drawings

From obtaining more detailed understanding as the detailed description that embodiment provides below in conjunction with accompanying drawing.Wherein:

Fig. 1 shows traditional radio link failure;

Fig. 2 shows traditional handoff failure;

Fig. 3 shows traditional based on uncontested random access procedure;

Fig. 4 is the block diagram of wireless communication system; And

Fig. 5 shows the disclosed flow chart that is used to handle the method for radio link failure.

Embodiment

The term of hereinafter quoting " wireless transmitter/receiver unit (WTRU) " is including, but not limited to the subscriber equipment that can work in wireless environment of subscriber equipment (UE), mobile radio station, fixing or moving user unit, beep-pager, cell phone, PDA(Personal Digital Assistant), computer or other any kind.The term of hereinafter quoting " base station " is including, but not limited to Node B, site controller, access point (AP) or other any interface equipment that can work in wireless environment.

With reference to figure 4, LTE cordless communication network (NW) 10, for example, comprise one or more WTRU20, one or more Node B 30 and one or more sub-district 40, each WTRU comprises processor 21, each Node B 30 comprises processor 31, and each sub-district 40 comprises one or more Node B (NB or eNB) 30.Processor 21 and 31 all is configured to carry out the disclosed method that is used to handle radio link (RL) and handoff failure.

In whole disclosed method, contextual information is meant the context that may be continued of any radio resource control (RRC) context, safe context, PDCP (PDCP) context or any layer in mobility.Yet for the purpose of brief, term context or RRC context can be used as the context of top disclosed each type.

When the RL failure is detected by WTRU 20, WTRU 20 beginning mobile process, (that is sub-district gravity treatment).In common cell reselection process, WTRU 20 arrives any available sub-district in RL failure back gravity treatment, and by cell update or radio resource control (RRC) connection request, WTRU20 sends its WTRU and identifies to e Node B (eNB) 30.Whether eNB 30 uses the WTRU label detection WTRU 20 before the radio link failure takes place that receives to be under the control of this eNB 30.

A kind of method and apparatus is disclosed, wherein at radio link (RL) or after switching (HO) failure, WTRU 20 comprises that its WTRU sign (for example TMSI/IMSI/IMEI or any other UE sign) and eNB sign and/or cell ID are as the information element (IE) in RRC connection request, cell update message or any other RRC message.

In case WTRU 20 takies after the gravity treatment of sub-district on eNB (that is, target eNB), the information that is comprised among the IE is transferred into described target eNB.If WTRU 20 shared target eNB are different from the shared eNB of before RL failure WTRU 20 (promptly, source eNB), then described target eNB uses the eNB sign and/or the sub-district ID that are comprised among the IE to get in touch source eNB, so that the sign of WTRU 20 is informed source eNB.Then, target eNB request source eNB transmits the context parameters of WTRU 20.Replacedly, target eNB also can be informed cell ID source eNB.

If source eNB has found the contextual information that the sign with WTRU 20 is complementary, then described source eNB is sent to target eNB with this contextual information.Then, described target eNB can be sent to response WTRU 20 cell updates, RRC connection request or any RRC process that other is initiated by WTRU, the context before indication WTRU 20 may reuse.

If described context is not found by source eNB that then target eNB is carried out cell update/RRC connection and set up process or any other RRC process.Receive from WTRU 20 under the situation that rebulids the RRC connection requests in target eNB, described target eNB sends all layers 1 and layer 2/3 parameter with signal, should be new RRC originally as it and connects and send the signal.Then, WTRU 20 can delete any contextual information of having stored that is applicable to old sub-district.Replacedly, if do not find context, then WTRU 20 can enter RRC idle and not waiting timer T2 stop, and restart process or waiting timer T2 stops to enter the RRC free time.

Disclosedly comprise that the IE about the information of the last shared eNB of WTRU 20 can be comprised by WTRU 20.According to this alternative embodiment, only processor 21 just comprises eNB sign and/or cell ID in IE when detecting handoff failure.

If the shared target eNB of WTRU 20 is identical with source eNB before the failure and if eNB has found to be used for the context of WTRU 20, (whether eNB has the context that the sign with WTRU20 is complementary by check eNB is found described context), then when receiving RRC CONNECTION REQUEST (RRC connection request) from WTRU 20 (or when receiving any RRC process that other is initiated by WTRU), the identical contextual information that eNB can indicate WTRU 20 to use eNB to be had before failure takes place.Otherwise eNB can be sent to WTRU 20 with signal with all layers 1 and layer 2/3 parameter, should be new RRC as eNB and connects and send the signal.Then, WTRU 20 can delete any contextual information of having stored.

The employed flow chart that is used to handle the method for RL failure of disclosed processor 21 by WTRU 20 is described below.When detecting the RL failure (step 500), WTRU 20 indications are used to be linked into the process (step 501) of selected target eNB.Then, WTRU 20 transmits IE to target eNB, and this IE comprises the eNB ID (step 502) of source eNB shared before the WTRU 20 at least.Then, after the RRC context was obtained by target eNB, WTRU 20 received this context from target eNB, for example, receives from source eNB.

According to disclosed method, the duration in target eNB reservation radio access control (RAC) contextual cycle is preferably decided based on specific implementation.Whether the transmission of determining the contextual information between target eNB and the source eNB only takes place when radio link is failed also is such.

If the shared target eNB of WTRU 20 and WTRU 20 shared source eNB before switching is identical, then when receiving RRC CONNECTION REQUEST from WTRU 20 or receiving any RRC process that other is initiated by WTRU, the identical contextual information that can indicate WTRU 20 to use eNB before failure takes place, to be had.

Such just as the skilled personnel to understand, the same sub-district or the WTRU on the same eNB 20 that take in that WTRU 20 just took before the RL failure help to have saved Internet resources.Similarly, disclosed method can replacedly be included in during the cell selecting process after the RL failure, and WTRU 20 considers source eNB sign, therefore than the sub-district from different e NB, preferably from the sub-district of source eNB.According to this alternative embodiment, preferably, WTRU 20 determines the priority of detected eNB: WTRU 20 last shared sub-district before with following order; Shared sub-district before the WTRU 20 from same e Node B; And from the sub-district of any other e Node B.

Because after failure, the initiation that takies fast and call out is a main standards, can also can not considered in the situation of radio link failure by WTRU 20 so be used for other parameter of sub-district gravity treatment; Only obtain eNB sign (or cell ID), and after the cell signal strength, just be enough to when radio link is failed, instruct cell selecting.According to this method, described sign (eNB and sub-district) can be broadcasted in system information with sub-district ID.

For handoff failure, a kind of method is disclosed, wherein move to different sub-districts and this different sub-district when belonging to same eNB as WTRU 20, based on WTRU 20 signs, what WTRU 20 had moved to determines whether this eNB has WTRU 20 contexts.If this eNB has described context, then eNB informs that with signal WTRU 20 uses and identical before context.Because this context is stored about eNB rather than about the sub-district, so WTRU 20 can use identical context.Method as an alternative, according to this method, as top disclosed, the same priority of the cell selecting of the RL of being used for failure described above is applicable to the eNB handoff failure.

When WTRU 20 moves to sub-district from diverse eNB, above the disclosed same process that is used for the radio link failure also can be used.It should be noted that in such handoff procedure according to the stage of handoff failure process, last eNB sign that WTRU 20 can store can be source eNB or target eNB.According to the method for the disclosure, preferably, WTRU 20 is stored as last shared eNB of WTRU 20 with source eNB, up to completing successfully switching.No matter whether WTRU sends source eNB or target eNB identifies the shared last eNB to WTRU, self can not be affected this process.

Can regain a contextual importance is because WTRU takies the sub-district as soon as possible and sends message 1 (being random access preamble) in the RACH process.If in this process delay is arranged, then eNB should delete this context, and it is invalid therefore to make context recapture process.Therefore, the method for enhancing Random Access Channel (RACH) process of a kind of RL of being used for and handoff failure is disclosed.According to this method, special marker is assigned to WTRU 20 during handoff procedure.Then, the special marker of being distributed is used as and then RL or handoff failure access cell-of-origin.For example, HO instruction (or any signaling message) is that WTRU 20 distributes two special marker, under the situation that failure takes place (for example, if WTRU 20 can not manage to insert Target cell), a special marker will be used for inserting Target cell by WTRU 20, and another special marker will be used for inserting cell-of-origin (or any other sub-district) by WTRU 20.

Completed successfully if switch, then WTRU 20 can (implicit expression or explicit) discharge back network with mark in switch acknowledgment message.Under the situation of failing between transfer period, WTRU 20 can use this second special marker and attempt access network as early as possible.Because WTRU 20 has used special marker, so can from failure, recover quickly.

Replacedly, one group of special marker is broadcasted to be used for the RL failure exclusively in broadcast channel (BCH) group, and this group special marker is to be used by WTRU 20 under the situation of RL or handoff failure.In another alternative embodiment, one group in all sub-districts all effectively universal dedicated signature can be used for RL failure.This group universal dedicated signature can be sent out in switching message, or is broadcasted in system information.Then, WTRU can use this universal dedicated signature to insert any sub-district after failure.

An interchangeable RACH process is disclosed, rather than will under the situation of failure, the special marker that use distribute to WTRU 20, at least one mark (for example random access preamble) in broadcast on BCH current group can be determined/reserve to be used for the access sub-district of and then failing.According to this alternative embodiment, the mark that WTRU 20 is reserved from the BCH acquisition (perhaps switch (HO) instruction and can inform the mark of being reserved that WTRU 20 will be used under the situation of failure).In case the mark that WTRU 20 acquisitions are reserved, if WTRU 20 experience RL or handoff failures, then WTRU 20 uses these marks of reserving.

Another alternative embodiment is disclosed, and the higher access grade that wherein is used for RL failure processing is used.According to this alternative embodiment, WTRU 20 handles the RL failure and higher access grade service linkage, and therefore may finish the gravity treatment of network with lower compensation or higher priority.Under these circumstances, when WTRU 20 attempts in access sub-district, RL failure back, because WTRU 20 may have higher access grade service, and therefore may attempt with lower compensation or do not have different RACH between attempting backoff interval access network 10.Similarly, back WTRU 20 may have the higher possibility with lower access grade service access network than other WTRU in the RL failure, and it may have longer backoff interval.

Be used for RACH at another and insert the replacement method, WTRU 20 increases its power quickly, and network has highlyer to its chance that detects thus, and therefore distinguishes the priority of given WTRU 20.Table 3 has been described the mobility of WTRU 20 during the RL failure according to the method for the disclosure.

Table 3: mobility and radio link failure

Situation	Phase I	Second stage	T2 stops	The priority of cell selecting
					UE returns same sub-district	As taking place, radio problem do not continue	Not having the mutual activity between WTRU and the e Node B not to be resumed, is FFS with the process that is used, and does not pass through RRC_IDLE usually	Pass through RRC_IDLE	??1
UE selects different sub-districts from same e Node B	??N/A	Do not have between WTRU and the e Node B mutual activity can not be resumed	Pass through RRC_IDLE	??2
					UE selects the sub-district of different e Node B	??N/A	Not having the mutual activity between WTRU and the e Node B not to be resumed, is FFS with the process that is used, and does not pass through RRC_IDLE usually	Pass through RRC_IDLE	??3

For second stage, in order to turn back to same sub-district as WTRU 20 or to recover active as WTRU 20 when same e Node B or different eNB select different sub-districts, a kind of method is disclosed, wherein WTRU 20 inserts the sub-district by random access procedure.Employed Non-Access Stratum (NAS) sign also is used for determining by eNB whether eNB has the RRC context of being stored for described WTRU 20 in the random access procedure.If eNB has found the RRC context of coupling WTRU 20 signs, then eNB (for example sends message in response to RRC CONNECTIONION REQUEST, RRCCONNECTION RESPONSE (RRC connection response)) or any RRC process that other is initiated by WTRU, indication WTRU 20 reuses the RRC context that it has been stored.

If eNB does not find to mate the RRC context of WTRU 20 signs, then new eNB uses the eNB that is transmitted by WTRU 20 to identify and contacts directly the eNB that takies before.As top disclosed, replacedly, eNB can obtain WTRU sign or WTRU context from mobile management entity (MME).

If context is found and is transmitted in old eNB, then eNB (for example sends message in response to RRCCONNECTION REQUEST, RRC CONNECTIONRESPONSE), or any RRC process that other is initiated by WTRU, indication WTRU 20 reuses the RRC context that it has been stored.If in new and old eNB, all do not find context, RRC then takes place connect and set up process, and WTRU 20 abandons the RRC context that it has been stored.Under the situation of network transmission by the response of the RRC process of WTRU 20 initiations, whether network 10 indication WTRU 20 can use its old contextual information that has before failure to set up stack, and perhaps network 10 sends new parameter and sets up its stack to be used for WTRU 20 in response message.In case WTRU20 receives response message and it is handled from network 10, WTRU 20 transmits and finishes message and finished configuration to network 10 in one side to be used for indication network 10.

Following table 4 has been described the mobility of the WTRU 20 during the handoff failure according to disclosed method.

Table 4: mobility and handoff failure

Situation	Phase I	Second stage	T2 stops	The priority of cell selecting
					UE target approach sub-district	As there not being wireless issue to take place to continue	Do not have between WTRU and the e Node B mutual activity can not be resumed	Pass through RRC_IDLE	??1
UE returns the cell-of-origin	??N/A	Do not have between UE and the e Node B mutual activity can not be resumed	Pass through RRC_IDLE	??2
					UE selects different sub-districts from same e Node B	??N/A	Not having the mutual activity between UE and the e Node B not to be resumed, is FFS with the process that is used, and does not pass through RRC_IDLE usually	Pass through RRC_IDLE	??3
UE selects the sub-district of different e Node B	??N/A	Not having the mutual activity between UE and the e Node B not to be resumed, is FFS with the process that is used, and does not pass through RRC_IDLE usually	Pass through RRC_IDLE	??4

For second stage, in order to recover active when same eNB or different eNB select different sub-districts when WTRU20 returns same sub-district or as WTRU 20, a kind of method is disclosed, and wherein WTRU 20 inserts the sub-district by random access procedure.The Non-Access Stratum that uses in random access procedure (NAS) sign also is used for determining by eNB whether eNB has the RRC context of having stored that is used for WTRU 20.If eNB has found the RRC context of the sign of coupling WTRU 20, then eNB (for example sends message in response to RRC CONNECTION REQUEST, RRCCONNECTION RESPONSE) or any RRC process that other is initiated by WTRU, indication WTRU 20 reuses the RRC context that it has been stored.

If eNB does not find to mate the RRC context of the sign of WTRU 20, the eNB that takies before then new eNB uses the eNB that is transmitted by WTRU 20 to identify to contact directly.As top disclosed, replacedly, eNB can obtain WTRU sign or WTRU context from MME.

If context is found and is transmitted in old eNB, then this context response (for example sends message in RRCCONNECTION REQUEST, RRC CONNECTIONRESPONSE) or any RRC process that other is initiated by WTRU, indication WTRU 20 reuses the RRC context that it has been stored.If all do not find context in new or old eNB, common RRC then takes place connect and set up process and WTRU 20 preferably abandons the RRC context that it has been stored.Should be noted that the use at the priority row of the cell selecting of table 3 and 4 is a replacement method, and no matter priority is used if be used for other priority of cell selecting/gravity treatment, then disclosed process is still available.

Embodiment

One kind in wireless transmission receiving element (WTRU), carry out be used for method of wireless communication,

This method comprises:

Detect failure, this failure comprises at least one in radio link (RL) failure and switching (HO) failure;

Transmit wireless transmission receiving element (WTRU) sign and information element (IE), this IE comprises at least one in source node B sign and the cell-of-origin sign, is used to insert destination node; And

To small part based on described IE, receive contextual information from described target node b.

2. according to embodiment 1 described method, this method also comprises selects the sub-district gravity treatment of available targets Node B to instruct to being used to.

3. according to the described method of each embodiment in the foregoing description, wherein when selecting the available targets Node B, consider described source node B sign.

4. according to the described method of each embodiment in the foregoing description, wherein said gravity treatment comprises:

At first attempt gravity treatment to described source node B; And

When described source node B is unavailable, attempts gravity treatment and go back to the cell-of-origin that is associated with described cell-of-origin sign.

5. according to embodiment 4 described methods, wherein said target node b and Target cell are different from described source node B and cell-of-origin.

6. according to the described method of each embodiment in the foregoing description, this method is stored contextual information before also being included in and detecting failure.

7. according to the described method of any embodiment among the embodiment 1-6, wherein said contextual information comprises using the indication of stored contextual information.

8. according to the described method of any embodiment among the embodiment 1-6, wherein said contextual information comprises and the different contextual information of described stored contextual information.

9. according to the described method of each embodiment in the foregoing description, this method comprises that also in increasing at least one of compensation that use is littler or higher power comes access network.

10. according to the described method of each embodiment in the foregoing description, this method also is included in and receives at least one special marker that is assigned with between transfer period, and described thus special marker is used for inserting the cell-of-origin after RL or handoff failure.

11. according to embodiment 10 described methods, wherein said at least one special marker is received by switching command.

12. according to embodiment 10 described methods, this method comprises that also reception comprises the switching command of two appointed special marker, one of them special marker is used to insert target node b, and another special marker is used for inserting source node B under the situation that RL or handoff failure take place.

13. according to embodiment 12 described methods, this method also is included in and discharges described two special marker after described switching is done.

14. according to the described method of each embodiment in the foregoing description, wherein described at least one special marker from the mark group is reserved on the broadcast channel to be used for inserting arbitrary sub-district from arbitrary Node B after RL or handoff failure.

15., be received in switching command wherein for special use inserts the described mark group of reserving according to embodiment 14 described methods.

16. a wireless transmission receiving element that comprises processor, described processor are configured to carry out the described method of above-mentioned each embodiment.

17. a Node B that comprises processor, described processor are configured to carry out the described method of above-mentioned each embodiment.

18. a processor is configured to carry out the described method of above-mentioned each embodiment.

Though feature of the present invention and element are described with particular combination in the above-described embodiment, but each feature or element can be under the situation that does not have other features and element use separately, or with or with under the various situations that other features and element combine do not use.Method provided by the invention or flow chart can be implemented in computer program, software or the firmware carried out by all-purpose computer or processor, and wherein said computer program, software or firmware are to be included in the computer-readable recording medium in tangible mode.The light medium that comprises magnetizing mediums, magnet-optical medium and the CD-ROM video disc of read-only memory (ROM), random-access memory (ram), register, buffer storage, semiconductor memory apparatus, internal hard drive and moveable magnetic disc and so on and digital versatile disc (DVD) and so on about the example of computer-readable recording medium.

For instance, appropriate processor comprises: general processor, application specific processor, conventional processors, digital signal processor (DSP), a plurality of microprocessor, the one or more microprocessors that are associated with the DSP core, controller, microcontroller, application-specific integrated circuit (ASIC) (ASIC), field programmable gate array (FPGA) circuit, any integrated circuit (IC) and/or state machine.

The processor that is associated with software can be used to realize a radio frequency transceiver, so that used in wireless transmission receiving element (WTRU), subscriber equipment (UE), terminal, base station, radio network controller (RNC) or any host computer.WTRU can be used in combination with the module that adopts hardware and/or form of software to implement, for example camera, camara module, video telephone, speaker-phone, vibratory equipment, loud speaker, microphone, TV transceiver, Earphone with microphone, keyboard, bluetooth

Module, frequency modulation (FM) radio-cell, LCD (LCD) display unit, Organic Light Emitting Diode (OLED) display unit, digital music player, media player, video game machine module, explorer and/or any wireless lan (wlan) or ultra broadband (UWB) module.

Claims (26)

1. One kind in wireless transmission receiving element (WTRU), carry out be used for method of wireless communication, this method comprises:

   Detect failure, this failure comprises at least one in radio link (RL) failure and switching (HO) failure;

   Transmit wireless transmission receiving element (WTRU) sign and information element (IE) to be used to insert destination node, this IE comprises at least one in source node B sign and the cell-of-origin sign; And

   To small part based on described IE, receive contextual information from described target node b.
2. 2. method according to claim 1, this method also comprise the sub-district gravity treatment that is used to select the available targets Node B.
3. 3. method according to claim 2 wherein when selecting the available targets Node B, is considered described source node B sign.
4. 4. method according to claim 3, wherein said gravity treatment comprises:

   At first attempt gravity treatment to described source node B; And

   When described source node B is unavailable, attempts gravity treatment and go back to the cell-of-origin that is associated with described cell-of-origin sign.
5. 5. method according to claim 4, wherein said target node b and Target cell are different from described source node B and cell-of-origin.
6. 6. method according to claim 4, this method are stored contextual information before also being included in and detecting failure.
7. 7. method according to claim 6, wherein said contextual information comprise using the indication of stored contextual information.
8. 8. method according to claim 6, wherein said contextual information comprise and the different contextual information of described stored contextual information.
9. 9. method according to claim 1, this method comprise that also in increasing at least one of compensation that use is littler or higher power comes access network.
10. 10. a wireless transmission receiving element (WTRU), this WTRU comprises:

    Be used to detect the processor of failure, described failure comprises at least one in radio link (RL) failure or switching (HO) failure;

    Transmitter is used to transmit WTRU sign and information element (IE) to target node b, and described IE comprises at least one in Node B sign and the cell ID; And

    Receiver, be used for to small part based on described IE, receive contextual information from described target e Node B.
11. 11. WTRU according to claim 10, wherein said Node B sign is the sign of source node B, and described WTRU takies on this source node B before detecting failure.
12. 12. WTRU according to claim 11, wherein call identification is the sign of sub-district, and described WTRU takies on this sub-district before detecting failure.
13. 13. WTRU according to claim 11, wherein said processor store the source node B sign of described source node B.
14. 14. WTRU according to claim 13, wherein said processor carry out the sub-district gravity treatment to select available target node b.
15. 15. WTRU according to claim 14, wherein said processor use the source node B that the is stored sign of considering when selecting described target node b.
16. 16. WTRU according to claim 15, wherein said processor attempt to come gravity treatment to arrive source node B by any other Node B, then when described source node B was unavailable, described processor was attempted gravity treatment and is gone back to the cell-of-origin that is associated with the cell-of-origin sign.
17. 17. WTRU according to claim 16, wherein said target node b and Target cell are different from described source node B and cell-of-origin.
18. 18. WTRU according to claim 16, wherein said processor was stored contextual information before detecting failure.
19. 19. WTRU according to claim 18, wherein said contextual information comprise using the indication of stored contextual information.
20. 20. WTRU according to claim 18, wherein said contextual information comprise and the different contextual information of described stored contextual information.
21. Receive at least one special marker that is assigned with between transfer period 21. a method that is used to handle radio link (RL) and handoff failure, this method are included in, described thus special marker is used for inserting the cell-of-origin after RL or handoff failure.
22. 22. method according to claim 21, wherein said at least one special marker is received by switching command.
23. 23. method according to claim 22, this method comprises that also reception comprises the switching command of two appointed special marker, one of them special marker is used to insert target node b, and another special marker is used for inserting source node B under the situation that RL or handoff failure take place.
24. 24. also being included in, method according to claim 23, this method discharge described two special marker after described switching is done.
25. 25. method according to claim 21, wherein described at least one special marker from the mark group is reserved on the broadcast channel to be used for inserting arbitrary sub-district from arbitrary Node B after RL or handoff failure.
26. 26. method according to claim 25 is received in switching command for special use inserts the described mark group of reserving wherein.

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