CN103517322A

CN103517322A - Method for providing information in cellular radio communication system

Info

Publication number: CN103517322A
Application number: CN201310293524.XA
Authority: CN
Inventors: 亨里克·奥鲁佛松; 彼得·莱格; 约翰·约翰松; 王学龙
Original assignee: Huawei Technologies Co Ltd
Current assignee: Huawei Technologies Co Ltd
Priority date: 2010-08-13
Filing date: 2010-08-13
Publication date: 2014-01-15
Anticipated expiration: 2030-08-13
Also published as: CN105072644B; CN105072644A; CN103517322B

Abstract

The invention relates to a method for providing information in a cellular radio communication system. The method for providing the information in the cellular radio communication system comprises the following steps that (1) when a first cell is connected, RLF of a mobile station is detected; (2) connection is rebuilt in a second cell; (3) information related to the RLF is only provided for a cell, wherein the same RAT is supported by the cell, the first cell and/or a third cell, and the mobile station is connected to the third cell before the third cell is connected with the first cell. The invention further relates to a method of the mobile station, a method of a base station, a computer program, a computer program product, a mobile station device and a base station device.

Description

For the method for information is provided at cellular radio communication system

Technical field

The present invention relates to a kind ofly for the method for information is provided at cellular radio communication system, or or rather, relate to a kind of according to the method for the preamble of claim 1.In addition, the invention still further relates to method, a kind of method in base station, a kind of computer program, a kind of computer program, a kind of mobile station apparatus and a kind of base station apparatus in a kind of travelling carriage.

Background technology

Conventionally, the travelling carriage in activity pattern in cellular radio communication system (MS) ，Cong Yige community when it moves through system is switched to next community, and data can transmit and receive, and can not cause obvious interruption because of these switchings.

Switching (HO) flow process can be comprised of some steps.In many cellular radio communication systems, HO is: 1) by network control,, when being connected to another community, MS is by network control; 2) prepared, prepare the Target cell that MS will move to; And 3) by MS, assisted, MS ，Xiang Serving cell before HO provides measurement report, determines that the HO of Target cell prepares to assist, and leaves Serving cell/the be connected to time of Target cell.

In the context of HO, the Serving cell before HO is usually called cell-of-origin.After successful HO, Target cell becomes Xin Serving cell.In Long Term Evolution (LTE), HO is " direct-cut operation ", represents that UE wireless link is switched to another (target) community from (source) community.In Universal Mobile Telecommunications System (UMTS), direct-cut operation is exclusively used in time division duplex (TDD) pattern, but also can be used for Frequency Division Duplexing (FDD) (FDD) pattern.

Below will focus on that LTE is with frequency HO flow process, but for LTE cross wireless access technology (RAT) and LTE alien frequencies HO flow process, its flow process is similar.Inner subscriber equipment (UE) the auxiliary network control type HO that adopts of E-UTRAN under RRC_CONNECTED state exists HO to prepare signaling in E-UTRAN.

HO is triggered by the measurement report that is sent to service eNB (E-UTRAN NodeB) from UE at first.How service eNB is measured for UE, and measurement report should trigger and be sent to eNB under which condition, and configures.

For auxiliary moving control decision, UE can measure some different communities and by report the test to network.Different networks and network design can have different concrete behaviors, but when the signal of most systems Zhong， Target cell receives the signal that is better than cell-of-origin and receives triggering HO naturally.

In the situation that (Ji cell-of-origin and Target cell are used in the system of same frequency resources completely) carries out with frequency HO in single-point multiplex system (reuse-one system), (always) when keeping UE to be connected to the community with optimum signal intensity, there is strong jamming management benefit.In measurement report, UE comprises that HO triggers reason, for example, Target cell signal is better than Serving cell signal, and to Serving cell with comprise the Reference Signal Received Power (RSRP) of some neighbor cells of Target cell or the measurement that Reference Signal Received Quality (RSRQ) carries out.Reduce the ping-pong while repeatedly switching between UELiang Ge community, HO skew can be added in HO trigger condition conventionally: by being once offset, Target cell signal should be better than Serving cell signal, wherein deviant > 0dB.

When service eNB receives measurement report from UE, and eNB will be by UE HO when another community, and the HO that eNB carries out for this community prepares.HO prepares to relate to the signaling exchange between (service) eNB and another (target) eNB.Cell-of-origin request HO(handover request) and ignore UE contextual information; And Target cell determines that it can access UE(access-in management and control), and determine it is to accept or refusal HO.Comprise that UEYu Target cell communicates required parameter accepting message (switching request acknowledgement message) Zhong， Target cell, these parameters are divided in transparent vessel.A plurality of communities can be prepared to carry out HO in cell-of-origin.

After success is prepared, there is HO and carry out.Cell-of-origin sends HO order to UE, i.e. RRCConnectionReconfiguration message, and carry transparent vessel.Once UE correctly receives this message, UE is synchronized to Xin Target cell, and sends synchronization message by Random Access Channel (RACH).Target cell sends and distributes to UE with rear, so that UE can send to Target cell HO acknowledge message (RRCConnectionReconfiguration-Complete message).

In not relating to the final step (switching completes) of UE, it serves cell-of-origin source eNB() data (unacknowledged downlink packet) can be forwarded to target eNB (it serves cell-of-origin), and must be from converting into target community, cell-of-origin (" path conversion " (path switch)) from the S1-U interface of gateway (S-GW).Finally, if handover success, target eNB sends UE context release message to source eNB.

But due to Radio Link Failure (RLF) or RACH failure, HO may failure on difference.RACH failure during HO is called " handoff failure " in 3GPP TS36.331, but for remainder herein, term " HO failure " comprises RLF failure and RACH failure simultaneously.

After HO failure, UE attempts carrying out the RRC described in standard 3GPP TS36.300 and 3GPP TS36.331 and rebuilds.First, UE attempts finding it can detect Qiang community (" community selection "), and then UE sends RRCConnection-ReestablishmentRequest to its selected community.If selected community has the prior knowledge about UE, and the details that connect about UE (for example, security parameter, this is called " UE context "), this community can send RRCConnectionReestablishment so, then successfully rebuild, represent that UE remains in Radio Resource and controls (RRC) connected state.

But if lack UE context, the request of rebuilding is so refused, and UE transfers RRC Idle state to, thereby causes before UE transfers RRC connected state to and restarts any data communication, further postpones." UE context " can send community to during HO flow process or on some other time point.This transmission is called HO and prepares.Note also, RRCConnectionReestablishmentRequest carries three fields, there is the Cell Radio Network Temporary Identifier/Identity, Cell-RNTI (C-RNTI) of the UE in failed Serving cell, the Physical Cell Identifier of this community (PCI), and the shortMAC-I calculating by rebuilding the sign (ID) of community.

Hard HO in Universal Mobile Telecommunications System (UMTS) is all closely similar with above-mentioned explanation aspect a lot, also by UE, assisted and by network control, this represents that UE is for sending the measurement report having triggered, and the time of network decision execution HO; (using wireless link flow process) prepares; Be " backward " HO, this represents that cell-of-origin sends HO order to UE, and UE replys Target cell; And complete by signaling between node.

In addition, RLF is described in standard 3GPP TS36.300 and 3GPP TS36.331.The detection of loss of mains that a kind of RLF of form is carried out by layer 1 drives.When UE receives continuous " step-out " indication of specific quantity from lower level, start wireless issue testing process.The quantity of indication is specified by threshold value N310 continuously.When this situation occurs, UE starts timer T310.At UE, from lower level, receive continuous " synchronously " indication of specific quantity (N311), in the situation that T310 is moving simultaneously, UE should stop timer, and returns to normal operating condition.

After statement RLF, UE attempts carrying out community selection.If UE attempts to find the community that will be connected in the choice phase in community, RRC is attempted rebuilding in UEJiang Duigai community so.On the other hand, if do not find community in the UE community choice phase (T311), UE returning to idle mode so, and can start to find other RATShang communities, and for example, LTE, UMTS, WiMaX, and GSM EDGE Radio Access Network (GERAN).

When reaching greatest maximum number of transmissions with transmit uplink RRC signaling bag, but described bag do not transmit when successful yet, and RLF also can control (RLC) layer by the wireless link of UE and state.In addition, if during HO, random access failure (T304 is overtime), the situation that UE shows as while occurring with RLF is so identical.Term herein " RLF " refers to above-mentioned any one event.

In addition, RLF report is introduced into 3GPP Rel-9 so that the eNB that receives RLF report distinguishes relating between the problem of mobile robustness optimization (MRO) and coverage problems.When this indicates unsuccessfully by adding, one group of neighbor cell measurement of signal strength signal intensity completes.Whereby, eNB can check whether there is the substituting neighbor cell that may use, or any neighbor cell whether do not detected in the situation that existing covering empty.

RLF report carries the information of relevant following aspect:

Serving cell RSRP, and optional RSRQ;

Neighbor cell RSRP/RSRQ; And

Also can indicate the intensity of the interactive RAT neighbor cell detecting.

In Rel-9, if the RLF during HO successfully carries out RRC reconstruction after occurring, in RLF INDICATION message, may comprise RLF report, when wherein said RLF INDICATION message sends to RLF and occurs from the eNB that occurs to rebuild just at the eNB of service UE.The mark of the performance that UE provides RLF report in RCConnectionReestablishmentComplete message indicated.RLF report offers the eNB that wherein uses UE information flow to rebuild subsequently.

A remaining problem in Rel-9 is that UE can only just send RLF report when RRC rebuilds successfully.And, appearance when this situation only may have in the community that receives RLF report the context (being HO " preparations ") of this UE.Under most of HO failure scenarios, because HO carried out evening, and wherein UE to attempt carrying out the community of RRC reconstruction offhand, so UE cannot send RLF report.

In order to relax this situation, existed some of the recommendations for also carry out RLF report after UE returning to idle mode.This expression, UE reports when attempting setting up RRC.

In addition,, in 3GPP, the self-organizing network of LTE (SON) has been carried out to large quantity research.This part is wherein handoff parameter optimization, above also referred to as MRO, is intended to optimize moving parameter.Although not yet specify the HO parameter that should be optimized, the example comprises HO sluggish (also referred to as skew) and triggered time (TTT) parameter.The object of optimizing is, reduces HO failure, reduces unnecessary HO simultaneously.MRO function is distributed in Evolved UTRAN (E-UTRAN), and each eNB has MRO optimization function separately.For auxiliary, optimize, signaling is also determined between eNB, to help to identify HO turkey.

Below described the use-case that handoff parameter is optimized, described handoff parameter optimization, at standard 3GPP TS36.300, is also referred to as MRO in the 22.5th joint of 9.2.0:

One of function of mobile robustness optimization [MRO] is, detects because of too early or spend evening and cross switching in evening, or is switched to wrong cell and the RLF that causes.The implementing procedure of this testing mechanism is as follows:

-[cross late HO] is if occurred after RLF at eNB A place, and UE attempts at eNB B place reconstruction wireless link, so eNB B can by RLF indicate flow process by this RLF event report to eNB A.

-[HO too early] is once eNB B receives RLF indication from eNB A, and eNB B sends with last Tstore_UE_cntxt and for same UE, completes and be about to the relevant UE context release message of the HO that carries out in second to eNB A, and eNB B can send the handover report message that indicate too early HO event to eNB A.

-[HODao wrong cell] receives RLF indication once eNB B from eNB C, and eNB B sends with last Tstore_UE_cntxt and for same UE, completes and be about to the relevant UE context release message of the HO that carries out in second to eNB A, and eNB B can send to eNB A the handover report message of expression HODao wrong cell event.If eNB B is identical with eNB C, and RLF is reported in the inside of this eNB, also may send indication.

The detection of above-mentioned event is indicated by RLF and handover report flow process realizes.

RLF indication flow process can occur after RLF at eNB A place, UE attempts starting after eNB B place rebuilds wireless link.The RLF Indication message that sends to eNB A from eNB B should comprise following information element:

-failed community ID: the PCI that RLF community occurs:

-rebuilding community ID: the ECGI of the community of RL reconstruction is carried out in trial;

-C-RNTI: the C-RNTI that the UE in RLF community occurs.

-shortMAC-I(is optional): the security configuration by cell-of-origin and 16 least significant bits rebuilding the MAC-I that cell ID calculates.

ENB B can initiate RLF indication to a plurality of eNB, and prerequisite is to use UE to send PCI community by signal during these eNB are controlled at reconstruction flow process.ENB A selects UE context mate with received failed community PCI and C-RNTI, and if can, with shortMAC-I, confirm this sign, method is, calculating shortMAC-I by itself and the IE comparison that receives.

After Target cell (in eNB B) sends UE context release message to source eNB A, soon, when in Target cell, (in eNB B) RLF occurs, handover report process is used in the situation that completing switching recently.Handover report message comprises following information:

The type of-the switching problem that detects (HO,HODao wrong cell too early)

The ECGI of-switching Zhong cell-of-origin and Target cell

In the situation of the ECGI(HODao wrong cell of-reconstruction community)

-switch reasons (sending by signal in switching preparatory stage Jian You source)

Interactive RAT moves

HO between different RAT, interactive RAT HO, can have different reasons.Wherein two examples can be:

Coverage on coverage-current RAT is not enough, and has coverage on other RAT.Therefore UE may be required that HO arrives another RAT;

Capacity in capacity-current RAT may be not enough, but have active volume in another RAT of covering the same area.

For the interactive RAT based on coverage moves, conventionally there are two absolute signal strength signal intensities, or signal quality threshold: the standard in source RAT and target RAT.In the situation that the UE expection in LTE system is present in target RAT, target RAT standard can be used for arranging threshold value.Source standard can be used for adjusting UE and starts to carry out the time that interactive RAT measures.

The too low meeting of standard of Serving cell causes measuring excessively, and high demarcated standard can cause call drop (dropped call), and this is cannot be for before further communication because the quality of Serving cell crosses difference, and UE cannot find any substituting.

According to standard 3GPP TS36.331, can be used for measuring the typical event configuring as follows:

Event A1: service is better than threshold value.

Event A2: threshold difference is compared in service.

Event A3: adjacent than the excellent side-play amount of service.

Event A4: the adjacent threshold value that is better than.

Event A5: it is poorer than threshold value 1 to serve, and the adjacent threshold value 2 that is better than.

Event B1: the adjacent threshold value that is better than of interactive RAT.

Event B2: it is poorer than threshold value 1 to serve, and the adjacent threshold value 2 that is better than of interactive RAT.

Herein " service " refer to Serving cell or cell-of-origin, and " adjacent " refers to the neighbor cell detecting.Different event compares cell signal strength (or quality) and fixed threshold, or the value of Serving cell and neighbor cell compares (comprising above-mentioned lagged value).

A kind of exemplary embodiment of interactive RAT HO algorithm (coverage HO) is as follows:

When the quality of Serving cell is during lower than acceptable level, by event A2, start interactive RAT and measure.

Pass through event B1 or B2 simultaneously, allocating and measuring interval (if needs), and configuration UE is to report another RAT community.

Interactive RAT MRO

The following parameter of interactive RAT MRO function capable of regulating in eNB:

The time (A2) that measurement on other RAT communities starts, and report the time (B2_threshold1) that should be triggered;

Before report, about the requirement (B1 and B2_threshold2) of Target cell;

The difference skew of different frequency arranges (described skew arranges via parameter ofn).

The error situation of interactive RAT MRO and the HO(in LTE with frequently or alien frequencies switching) MRO compare slightly different.Various error situations are as follows, and wherein IRAT represents interactive RAT:

IRAT is excessively late-and the threshold value of Serving cell requires to arrange too lowly, thus cause UE can start or before HO can carry out, move to outside Serving cell at measurement report;

IRAT too early-threshold value of Target cell require too low, thereby cause HO failure, or HO after soon, generation RLF;

IRAT is to wrong RAT(IRAT wrong RAT)-HO to after another RAT soon, generation RLF, thus cause rebuilding in the 3rd RAT;

IRAT is frequent-and the requirement of Serving cell arranges too definitely, even if may carry out HO in LTE, also can cause interactive RAT HO;

IRAT table tennis (ping pong)-compare when the requirement of UE change RATShi，Yu cell-of-origin, requiring of Target cell is too low;

The quick HO-of IRAT is after HO, and HO is to another RAT fast.

Can suppose, " IRAT is excessively late " is topmost failure scenarios, in the starting stage, is at least such, because the coverage of LTE system is unbalanced, if HO can not suffer failure when legacy system does not carry out in time." IRAT is excessively late " event can meet with RLF, returning to idle mode and attempt to find the number of times of new community to measure in another RAT by calculating in UE community.

MRO in the existing LTE of suggestion expansion, for example, so that exchange message (, NGMN alliance, handover optimization) between the network node in different RAT.In the example of " IRAT is excessively late ", this expression, the community that UE attempts to connect after RLF will receive from UE the report of relevant failed Qian Serving cell details.Then, this eNB need to be sent to the message that is similar to " RLF indication " eNB that processes the community that UE is connected to before RLF.As mentioned above, RAN information management (RIM) Application of Interface is in the information transmission of carrying out between different RAT.

In order to collect in RAT and exchange message, each RAT must be to from UE reception and decode about the information of another RAT, and sends this information with form generally acknowledged between RAT.

In addition, the most possible network interface using is RIM.This interface has been common to other purposes, to communicate between each RAT, but wherein requires signaling to limit.The reason of this restriction is the processing complexity of core net node.Therefore, this interface also may be had problems for inter-rat MRO.

Therefore, need a kind of method that information is provided in cellular radio communication system, to relax or to solve the problems of the prior art.

Summary of the invention

The object of this invention is to provide a kind of method that relaxes or solve the problems of the prior art.Another object of the present invention is to provide the interactive RAT HO of a kind of improvement problem detection, reduces signaling, and with the method for existing cellular communications system compatibility.Another object of the present invention is to provide a kind of alternative method that information is provided in cellular radio communication system.

According to an aspect of the present invention, described object realizes by a kind of method that information is provided in cellular radio communication system, each community in wherein said cellular radio communication system is served by base station, and the wireless access technology (RAT) of the radio communication between one or more travelling carriages of supporting to be used for community and to be connected to described community; Described cellular radio communication system adopts a kind of switching flow, wherein travelling carriage Ke Congyige community is switched to another community of supporting different radio access technologies (RAT), and further adopt a kind of flow process that reconnects, while being wherein connected to the travelling carriage generation Radio Link Failure (RLF) of Yi Ge community, can attempt reconnecting to another community of supporting different radio access technologies (RAT), said method comprising the steps of:

-when being connected to the first community, detect the Radio Link Failure (RLF) of travelling carriage;

-in the second community, rebuild and connect; And

-only to supporting the community of same wireless access technology (RAT) that the information of relevant described Radio Link Failure (RLF) is provided with described the first community and/or San community, wherein said San community be connect described the first community before, the community that described travelling carriage is connected to.

Dependent claims 2 to 16 discloses the above-mentioned embodiment about the method in cellular radio communication system.

According to a further aspect in the invention, described object also by a kind of for provide the method in the travelling carriage of information to realize at cellular radio communication system, each community in wherein said cellular radio communication system is served by base station, and the wireless access technology (RAT) of the radio communication between one or more travelling carriages of supporting to be used for community and to be connected to described community; Described cellular radio communication system adopts a kind of switching flow, wherein travelling carriage Ke Congyige community is switched to another community of supporting different radio access technologies (RAT), and further adopt a kind of flow process that reconnects, while being wherein connected to the travelling carriage generation Radio Link Failure (RLF) of Yi Ge community, can attempt reconnecting to another community of supporting different radio access technologies (RAT), said method comprising the steps of:

-when being connected to the first community, detect Radio Link Failure (RLF);

-in the second community, rebuild and connect; And

According to another aspect of the invention, described object also by a kind of for provide the method in the base station of information to realize at cellular radio communication system, each community in wherein said cellular radio communication system is served by base station, and the wireless access technology (RAT) of the radio communication between one or more travelling carriages of supporting to be used for community and to be connected to described community; Described cellular radio communication system adopts a kind of switching flow, wherein travelling carriage Ke Congyige community is switched to another community of supporting different radio access technologies (RAT), and further adopt a kind of flow process that reconnects, while being wherein connected to the travelling carriage generation Radio Link Failure (RLF) of Yi Ge community, can attempt reconnecting to another community of supporting different radio access technologies (RAT), said method comprising the steps of:

-when travelling carriage is connected to the first community, receive Radio Link Failure (RLF) report of the Radio Link Failure (RLF) of relevant described travelling carriage; And

If same wireless access technology (RAT) is supported in-described base station and described the first community Huo tri-communities, to described the first community and/or described San community the information of relevant described Radio Link Failure (RLF) is provided, wherein said San community be connect described the first community before, the community that described travelling carriage is connected to.

According to the method in above-mentioned base station embodiment, described in provide the step of information to comprise:

-by described communication to the first base station of serving described the first community, or be transferred to the San base station of serving described San community, this communication can directly carry out, and also can carry out via the one or more X2 on one or more other base stations in described cellular radio communication system and/or S1 interface.

Method in above-mentioned travelling carriage Zhong He base station can be modified according to the different embodiment of the method about cellular radio communication system.

The invention still further relates to a kind of computer program and a kind of computer program, when it moves in computer, can make computer carry out method in above-mentioned travelling carriage and the method in base station.

In accordance with a further aspect of the present invention, described object also by a kind of for provide the mobile station apparatus of information to realize at cellular radio communication system, each cell arrangements Cheng You base station service in wherein said cellular radio communication system, and the wireless access technology (RAT) of the radio communication between one or more travelling carriages of supporting to be used for community and to be connected to described community; Described cellular radio communication system adopts a kind of switching flow, wherein travelling carriage Ke Congyige community is switched to another community of supporting different radio access technologies (RAT), and further adopt a kind of flow process that reconnects, while being wherein connected to the travelling carriage generation Radio Link Failure (RLF) of Yi Ge community, can attempt reconnecting to another community of supporting different radio access technologies (RAT); Described mobile station apparatus is used for:

-when being connected to the first community, detect Radio Link Failure (RLF);

-in the second community, rebuild and connect; And

According to a further aspect of the invention, described object also by a kind of for provide the base station apparatus of information to realize at cellular radio communication system, each cell arrangements Cheng You base station service in wherein said cellular radio communication system, and the wireless access technology (RAT) of the radio communication between one or more travelling carriages of supporting to be used for community and to be connected to described community; Described cellular radio communication system adopts a kind of switching flow, wherein travelling carriage Ke Congyige community is switched to another community of supporting different radio access technologies (RAT), and further adopt a kind of flow process that reconnects, while being wherein connected to the travelling carriage generation Radio Link Failure (RLF) of Yi Ge community, can attempt reconnecting to another community of supporting different radio access technologies (RAT), described base station apparatus is used for:

According to mobile station apparatus of the present invention and base station apparatus, also can arrange according to the different embodiment of said method.

By using current solution, may support interactive RAT MRO, and without introduce signaling between different RAT, also without setting the mechanism that should how can be reported in the RLF event occurring in different RAT about UE.

The present invention further has following dominance effect: can carry out interactive RAT RLF problem detection, the for example detection of relevant switching problem, also the signaling of this content can be sent to original source community, in described original source community, can take correction measure to avoid later interactive RAT same problem to occur in switching; Process some interactive RAT failed handoff scenario, especially " IRAT is excessively late ", " IRAT is too early ", " IRAT is to wrong RAT " (IRAT wrong RAT); Only affect the LTE signaling capability of UE and eNB; Avoid any signaling from a RAT to another RAT, for example, use RIM flow process, thereby avoid producing extra duty in the core network element of two RAT; Compare with prior art solution, less on the impact of 3GPP standard convention; Only affect LTE standard convention; Can be by thering is the X2 interface of suitable extender, for example, RLF Indication message or handover report message, reuse existing procedure; And be applicable to be switched to non-3GPP RAT, and for example, WiMax or Wi-Fi.

Other advantages of the present invention and application will be expressed hereinafter.

Accompanying drawing explanation

Accompanying drawing is intended to illustrate and explains every embodiment of the present invention, wherein:

-Fig. 1 illustrates the typical cell sight that carries out cell measurement;

-Fig. 2 illustrates the present invention in the too early exemplary embodiment with crossing in late situation of IRAT; And

-Fig. 3 illustrates the present invention and arrives the exemplary embodiment in RAT mistake (IRAT to wrong RAT) situation at IRAT.

Embodiment

As mentioned above, the invention provides the interactive RAT RLF of a kind of identification problem, HO problem for example, and this information is forwarded to the method for original source community.

Therefore, the present invention relates to a kind of for the method for information is provided at cellular radio communication system, each community in wherein said cellular radio communication system by base station (BS) service, this represents that each community includes the BS that serves this community.The RAT of the radio communication between one or more MS that in addition, each community is supported to be used for community and to be connected to this community.System adopts a kind of switching flow, and wherein MS Ke Congyige community is switched to another community of supporting different RAT.System further adopts a kind of flow process that reconnects, while being wherein connected to the travelling carriage generation Radio Link Failure (RLF) of Yi Ge community, can attempt reconnecting to another community of the wireless access technology (RAT) of supporting that the RAT that supports from described community is different.

Said method comprising the steps of: when MS is connected to the first community, detect the RLF of MS; In the second community, rebuild the connection having disconnected; And only to supporting identical RAT community that the information of relevant RLF is provided with the first community and/or San community.San community is before MS is connected to the first community, the community that described MS is connected to.

According to an embodiment, therefore the present invention relates to a kind of mechanism, and wherein MS determines cell-of-origin in the situation that there is RLF failure, and identical community, RATYu cell-of-origin under this information is only reported to.Like this, the signaling requirement between different RAT reduces, in addition, and without transitional information between different RAT.Therefore,, according to one embodiment of the present invention, MS, when returning to the RAT identical with cell-of-origin, sends RLF report.

According to another embodiment of the present invention, RLF report comprises one or more in the group consisting of following item, comprise: the community ID of ID, tri-communities, community of the community ID of the measurement that combining wireless RLF carries out on the community detecting, the first community, the second community, and HO Fail Type.Preferably situation is, RLF report further comprises and comprises one or more in the group consisting of following item: RAT type, carrier frequency, Location Area Code, and the Routing Area Code of each community in system.

According to another embodiment of the present invention, transmitting step comprises: via one or more X2 and/or S1 interface on one or more other middle BS, carry out transmission information; And if information transmits via one or more X2 interface, situation is that described information is included in RLF Indication message or HO report message preferably.

The behavior of each MS of MS/ and each BS of BS/ is slightly different, specifically depend on type of error, and therefore, the example scenarios of different type of errors will be summarized hereinafter.Below specifically described the relevant HO(outgoing of going out HO), the LTE RLF from LTE to another RAT, is not limited to this situation but technical staff it should be understood that the present invention.

But for LTE system, the present invention only affects the LTE signaling capability of UE and eNB; And for example by using RIM flow process, further avoid any signaling from a RAT to another RAT, thereby avoid producing extra duty in the core network element of two RAT.UE must be able to record RLF failure details, and can, when being finally again connected to LTE system, report these details.Therefore the impact of 3GPP standard is less than to prior art solution, and this is advantage of the present invention.In addition, this method is also applicable to RLF, or the equivalent in non-3GPP RAT, for example, and WiMax or Wi-Fi.

The exemplary embodiment of following situation has been described hereinafter: " IRAT is excessively late ", " IRAT is too early " and " IRAT is to wrong RAT." still, as recognized in one of ordinary skill in the art, the present invention is not limited to these embodiment, but relate to simultaneously and be incorporated to all embodiment within the scope of appended independent claims.

Exemplary embodiment: IRAT is excessively late

1UE is connected to the community 1 of supporting that the eNB1 of RAT1 serves.UE moves to outside the coverage of community 1, wireless issue detected, and tries to find the community that it can be connected to.Try to find after a period of time UE returning to idle mode.

2 when Idle state, and UE detects from community 1 and adheres to different RAT(RAT2 separately) another community (community 2).UE is connected to this community 2, and keeps connecting a period of time (referring to (2) in Fig. 2).

3 is final, and UE retracts another community (community n) of RAT1.This community may be community 1 or other communities.UE remembers that its RLF that has stored cell-of-origin in RAT1 that can send, relevant reports.The eNB(that UE reports to the upper community n of processing of RAT1 by this is referring to (3) in Fig. 2).

4 eNB that serve community n receive RLF report, read report, for example find the community ID(of Shang Yige Serving cell (community 1), EGCI), and when community difference (community 1 is different from community n), the eNB(that information is forwarded to processing community 1 is referring to (4) in Fig. 2).

5 cell-of-origins (community 1) research RLF report, and adjust moving parameter by described information, for example, the threshold value of interactive RAT moving event.

Exemplary embodiment: IRAT is too early

1UE is connected to the community 1 of supporting that the eNB1 of RAT1 serves.

2UE is switched to and belongs to another RAT(RAT2) another community (community 2).At time threshold (T_dwell), in the determined a bit of time, UE detects wireless issue, and tries to find the community that it can be connected to.Try to find after a period of time UE returning to idle mode (referring to (2) in Fig. 2).

3 when idle pulley, and UE detects another community (community n) that belongs to RAT1.This community may be community 1 or other communities.UE is connected to this community, and described UE recognize ，Gai community have can send, about the RLF report UE of cell-of-origin in RAT1 by this report on RAT1, serve community n eNB(referring to (3) in Fig. 2).

4 eNB that serve community n receive RLF report.This eNB reads this RLF report, finds the EGCI of Shang Yige Serving cell (community 1), and in community when different (community 1 is different from community n), by information be forwarded to serve community 1 eNB(referring to (4) in Fig. 2).

5 cell-of-origins (community 1) research report, and adjust moving parameter by described information.

Exemplary embodiment: IRAT is to wrong RAT

1UE is connected to the community 1 of supporting that the eNB1 of RAT1 serves.

2UE is switched to and belongs to another RAT(RAT2) another community (community 2).At time threshold (T_dwell), in the determined a bit of time, UE detects wireless issue, and tries to find the community that it can be connected to.Try to find after a period of time UE returning to idle mode (referring to (2) in Fig. 3).

3 when Idle state, and UE detects and belongs to another RAT(RAT3) another community (community 3).UE is connected to this community (referring to (3) in Fig. 3).

4 is final, and UE retracts another community (community n) of RAT1.This community may be community 1 or other communities (referring to (4) in Fig. 3).

5UE remembers that its RLF that has stored cell-of-origin in RAT1 that can send, relevant reports.UE by this report on RAT1, serve community n eNB(referring to (5) in Fig. 3).

6 eNB that serve community n receive RLF report.This eNB reads this RLF report, finds the EGCI of Shang Yige Serving cell (community 1), and when community difference (community 1 is different from community n), information is forwarded to the eNB that serves community 1.

7 cell-of-origins (community 1) research RLF report, and adjust moving parameter by described information.

UE behavior

In order to determine type of error, UE must detect and store following community: before last HO, and the community that UE is connected to; Before there is RLF because HO is failed, the community that UE is connected to; And after RLF, the community that wherein UE reconnects.

In above-mentioned exemplary embodiment, different from MRO in LTE, UE is by comparing the time between HO and RLF and threshold value (T_dwell), thereby part is identification error type voluntarily indirectly, to determine whether being considered as cell-of-origin (" IRAT is excessively late " in the situation that) by there is RLF community, or whether the community before HO should be considered as to cell-of-origin (" IRAT is too early " or " IRAT arrives wrong RAT " in the situation that)." this is essential, because UE must identify cell-of-origin voluntarily, with the RAT to correct, report.It should be noted that this requirement transfers to UE by threshold value (T_dwell).

Following community should be reported by UE, to support interactive RAT MRO:

That cell-of-origin-wherein before error event, MS is connected to and support the community of RAT1.

Target cell-wherein attempts carrying out HO but during HO or RLF community occurs afterwards soon.

Final community-wherein MS try reconstruct arrives the community of the connection of network.

In table 1, listed under different error situations the mapping between the community detecting and the community of reporting.

Table 1: the mapping between the community detecting and the community of reporting

It should be noted that other definition that may use reported community, this can cause different mappings.In addition, UE also may a detection resources community, to understand in which RAT, report, and the community that detects of tale quale report, and without any mapping to final/Target cell.

UE is the complete identification error type of possibility also, and clearly this type of error is sent to eNB by signal.In order to distinguish between " IRAT is too early " and " IRAT mistake RAT ", whether UE only needs reference source RAT identical with the RAT that after RLF, UE attempted to reconnect to.

Interactive RAT information is collected by UE and reports

Except the prior art of measuring according to interactive RAT is collected the content of RLF report, UE also can according to one embodiment of the present invention collect related detection to the information that belongs to other RAT communities.Described information should be about failed cell-of-origin wherein occurs, because described information is passed to this community the most at last.

Cell-of-origin is before error event occurs, UE is connected to, RAT1 Zhong community.Owing to intending this information reporting to the RAT under cell-of-origin, so cell-of-origin can carry out unique identification by the global identity (ID) of this RAT, for example, by the EGCI in LTE system, carry out unique identification.

For Target cell and final community, wherein at least one community will belong to different RAT(or, event is not interactive RAT MRO event).Only need with reference to specific interactive RAT measuring object ID, because this ID can point to the Proprietary Information of adjacent R AT, carrier frequency for example, wherein said ID is used while being measured on other RAT by UE.But in view of each UE all configures, and because the report from UE may arrive immediately after failure, and cannot always require this information to be kept in eNB, therefore mode that may be more suitable is, by clearly send RAT type and carrier frequency by signal in system, thereby store information in mode that can self-demarking code.

Similar discussion is applicable to community ID.Because the list meeting of neighbor cell is delivered to UE, therefore may only need report by the index (for neighbor cell list) of the community that wherein UE attempts to reconnect, but because information may not can be kept in eNB, therefore according to one embodiment of the present invention, community ID may clearly report in system.The example of the information that may comprise is:

Carrier frequency E-UTRA Absolute Radio Frequency Channel Number (EARFCN).

RAT type, for example UTRAN/GERAN/CDMA2000.

Community ID.

But in some cases, physical district ID should be enough to identify Target cell and final community.An example of this situation is that because source eNB is required HODao Ci community, so Target cell is conventionally known in cell-of-origin.Therefore,, according to another example of the present invention, a kind of may be the physical I D of a reporting objectives and/or final community.

But, finally known to community possibility Bu Wei cell-of-origin.And, in the Neighboring Relation Table (NRT) in possibility Yi Cong cell-of-origin, Target cell, delete.Therefore, another kind of selection be, uses final community and/or for the World Wide ID of Target cell always.

In the situation that UE does not carry out any mapping (described in substituting solution as mentioned in the above) of target/final community, the community that UE detects needs report, that is:

Before last HO, the community that UE is connected to.

Before RLF, the community that UE is connected to.

After RLF, the community that wherein UE reconnects.

But in this case, UE cannot distinguish between cell-of-origin/Target cell/final community, and the therefore complete information about all communities by needs report, that is:

Carrier frequency EARFCN.

RAT type, for example UTRAN/GERAN/CDMA2000.

Community ID.

As further improvement, information also can expand to minimize the demand that UE Automatic Neighboring Relation (ANR) is measured.In this case, the information of collecting for target and final community is the in the situation that of GERAN detected cells, CGI and the Routing Area Code (RAC) that should always comprise the neighbor cell detecting, the in the situation that of UTRAN detected cells, should always comprise CGI, LAC and RAC, and the in the situation that of CDMA2000 detected cells, should always comprise CGI.

Another kind may be to use the available information in measuring object definition (as the definition in 3GPP standard TS36.331) to determine whether reporting the above-mentioned measurement about ANR.In LTE, there is a cell list, listed report UTRAN and CGI community, GERAN neighbor cell (cellForWhichToReportCGI).

From UE, receive the anticipatory behavior of the eNB of information

Suppose and exist another kind of suitable solution, this scheme also can make UE after returning to Idle state, report RLF report.

A solution is, the eNB that receives information from UE reads cell-of-origin EGCI, and if this community by different e NB, processed, information is forwarded to the eNB that processes cell-of-origin.This forwarding can realize in the following manner, use X2 interface and create new information unit, or existing RLF Indication message or RLF report message in LTE system adds extraneous information.Required extraneous information is the RAT information about Target cell and final community above summarized:

Carrier frequency.

RAT type.

Community ID.

The information of relevant ANR (optional).

Another kind may be, via S1 interface forwarding information.

Property solution, receives eNB and not only information can be forwarded to the eNB that serves cell-of-origin as an alternative, and described information can be forwarded to the eNB that serves target/final community, because point out these communities for error event, is favourable.

In the situation that UE does not carry out any mapping (as mentioned above), or in the situation that do not use signal to send any clear and definite cell-of-origin in the message from UE, the information that eNB must be used UE to report, execution error type detection voluntarily, to determine cell-of-origin.Complete after detection, eNB can be forwarded to cell-of-origin by information.In this case, UE only need collect and report the You Guan information of following content:

Before last HO, the community that UE is connected to.

Before RLF, the community that UE is connected to.

After RLF, the community that wherein UE reconnects.

Elapsed time between last HO and RLF.

According to this embodiment, the information of relevant community should comprise RAT information (as hereinbefore defined), and UE before attempting to reconnect to RLF, be connected to, during same RATZhong community, only report this information.Then, the eNB that receives this information is forwarded to this information the eNB that serves community, and described community is the RLF community that UE is connected to before.This eNB can determine type of error by provided information, and the community detecting and the community of reporting are carried out and similar mapping mentioned above.

If soon, there is not any HO before RLF, type of error is " IRAT is excessively late ", and the actual cell-of-origin that is equal to, community that before RLF, UE is connected to.Therefore, under this particular case, can directly with the detection of this error situation, adjust interactive RAT moving parameter, and without carrying out any extra information transmission.

On the other hand, if Ho occurred soon before RLF, type of error is " IRAT is too early " or " IRAT mistake RAT "; And cell-of-origin is the last HO community that UE is connected to before.In this case, information must be delivered to cell-of-origin by being similar to the message of the report of the HO in MRO in LTE.Compare with current LTE MRO solution, a difference is, this message may need to send to another RAT, and must be included about the RAT information of all three communities that detect.For UE, although this solution is comparatively easy, but still need on RAT, resend message, to carry out the detection of all error situations.

With reference to above-mentioned about a kind of for the embodiment of the method for information is provided at cellular radio communication system, the invention still further relates to a kind of method in MS and in BS.

Method in MS comprises the following steps: when being connected to the first community, detect RLF; In the second community of serving at the 2nd BS, rebuild and connect; And only to supporting identical RAT community that the information of relevant RLF is provided with the first community and/or San community, wherein San community be connect the first community before, the community that MS is connected to.

Method in BS comprises the following steps: receive the RLF report of the RLF of the relevant MS that is connected to the first community; And if BS supports identical RAT with the first community Huo tri-communities, to the first community and/or San community the information of relevant RLF is provided, wherein San community be connect the first community before, the community that MS is connected to.

According to the method in above-mentioned BS embodiment, provide the step of information to comprise: by communication to a BS who serves the first community, or be transferred to the 3rd BS that serves San community, this communication can directly carry out, and also can carry out via the one or more X2 on one or more other BS in communication system and/or S1 interface.

Method in above-mentioned MS and in BS can be modified according to the different embodiment of the method in above-mentioned cellular radio Communication system.

In addition, those skilled in the art will appreciate that, according to the method in MS of the present invention and the method in BS, can in the computer program with coding member, implement, when described computer program moves in computer, can make computer carry out each step of the method.Computer program is contained in the computer-readable media of computer program.Computer-readable media can be comprised of any memory substantially, for example ROM(read-only memory), PROM(programmable read only memory), the erasable PROM of EPROM(), flash memory, EEPROM(electricity erasable PROM) or hard disk drive.

And, the invention still further relates to a kind of MS device and a kind of BS device.MS and BS device can be and be applicable to any relevant RAT system of the present invention, for example any suitable device in LTE, UMTS, CDMA2000, WiMaX, Wi-Fi or GERAN.Therefore, MS may be UE, MS or SS[SS], and BS may be eNB, NodeB or BTS.

MS device is used for: when being connected to the first community, detect RLF;

In the second community of serving at the 2nd BS, rebuild and connect; And only to supporting identical RAT community that the information of relevant RLF is provided with the first community and/or San community, wherein San community be connect the first community before, the community that MS is connected to.

BS device is used for: receive the RLF report that MS is connected to the relevant RLF of the first community; And if BS supports identical RAT with the first community Huo tri-communities, to the first community and/or San community the information of relevant described RLF is provided, wherein San community be connect the first community before, the community that MS is connected to.

MS device of the present invention and BS device also can be arranged according to the different embodiment of the either method in disclosed method.

Claims

1. the method that information is provided in cellular radio communication system, each community in wherein said cellular radio communication system is served by base station, and the wireless access technology RAT of the wireless telecommunications between one or more travelling carriages of supporting to be used for community and to be connected to described community; Described cellular radio communication system adopts a kind of switching flow, wherein travelling carriage Ke Congyige community is switched to another community of supporting different radio access technologies RAT, and described cellular radio communication system further adopts a kind of flow process that reconnects, while being wherein connected to the travelling carriage generation Radio Link Failure RLF of Yi Ge community, can attempt reconnecting to another community of supporting different radio access technologies RAT, described method is characterised in that, comprises the following steps:

When being connected to the first community, detect the Radio Link Failure RLF of travelling carriage;

In the second community, rebuild and connect; And

Only to supporting same wireless access technology RAT community that the information of relevant described Radio Link Failure RLF is provided with described the first community.

2. method according to claim 1, wherein said information comprises the Radio Link Failure RLF report that described travelling carriage generates.

3. method according to claim 2, wherein said Radio Link Failure RLF report comprises following one or more: the cell ID ID of the cell ID ID of the measurement on the community that detect carried out relevant to described Radio Link Failure RLF, described the first community, the cell ID ID of described the second community, Ge tri-communities, and handoff failure type, wherein said San community be connect described the first community before, the community that described travelling carriage is connected to.

4. method according to claim 3, wherein said Radio Link Failure RLF report further comprises following one or more: the Location Area Code of each community that the carrier frequency of each community that the wireless access technology RAT type of each community that described Radio Link Failure RLF report comprises, described Radio Link Failure RLF report comprise, described Radio Link Failure RLF report comprise, and described Radio Link Failure RLF reports the Routing Area Code of each community comprising.

5. according to the method described in arbitrary claim in claim 2 to 4, if wherein same wireless access technology RAT is supported in Si community and described the first community and/or San community, described information exchange is crossed described travelling carriage and is transferred to the Si base station of serving described Si community, described Si community is after described Radio Link Failure RLF, the community that described travelling carriage is connected to, wherein said Si community is the arbitrary community in described first, second Huo tri-communities, or other communities.

6. method according to claim 5, further comprising the steps:

By described Si base station by described communication to serving the first base station of described the first community and/or serving the San base station of described San community.

7. method according to claim 6, wherein said transmitting step comprises:

In described cellular radio communication system, by one or more X2 and/or S1 interface, transmit described information.

8. method according to claim 7, if wherein described information is transmitted via described one or more X2 interface, described packets of information is contained in Radio Link Failure RLF Indication message or handover report message.

9. method according to claim 1, same wireless access technology RAT is not all supported in wherein said first, second, and third community.

10. method according to claim 1, wherein said travelling carriage is based on before occurring at described Radio Link Failure RLF, the time period that described travelling carriage is connected to described the first community determines whether described information to send to described the first community or Ge tri-communities and support same wireless access technology RAT community, wherein said San community be connect described the first community before, the community that described travelling carriage is connected to.

11. methods according to claim 10, if the time period that wherein described travelling carriage is connected to described the first community is over time of staying threshold value, described information is sent to described the first community and support same wireless access technology RAT community, otherwise described information is sent to described San community and supports same wireless access technology RAT community.

12. methods according to claim 11, wherein said time of staying threshold value sends to described travelling carriage from base station, or predetermined.

13. methods according to claim 1, one or more moving parameters are adjusted by described information in the base station of wherein serving the base station of described the first community and/or serving described San community.

14. 1 kinds for providing the method in the base station of information at cellular radio communication system, each community in wherein said cellular radio communication system is served by base station, and the wireless access technology RAT of the radio communication between one or more travelling carriages of supporting to be used for community and to be connected to described community; Described cellular radio communication system adopts a kind of switching flow, wherein travelling carriage Ke Congyige community is switched to another community of supporting different radio access technologies RAT, and described cellular radio communication system further adopts a kind of flow process that reconnects, while being wherein connected to the travelling carriage generation Radio Link Failure RLF of Yi Ge community, can attempt reconnecting to another community of supporting different radio access technologies RAT, described method is characterised in that, comprises the following steps:

If same wireless access technology RAT is supported in described base station and described the first community, when receiving MS and being connected to the first community about the Radio Link Failure RLF report of the Radio Link Failure RLF of described travelling carriage; And

If same wireless access technology RAT is supported in described base station and described the first community, to described the first community, community, provide the information of relevant described Radio Link Failure RLF.

Method in 15. base stations according to claim 14, wherein said information provides step to comprise:

By described communication to the first base station of serving described the first community,, communication directly carries out, or is undertaken by the one or more X2 in described cellular radio communication system and/or S1 interface.

16. 1 kinds for providing the mobile station apparatus of information at cellular radio communication system, each cell arrangements Cheng You base station service in wherein said cellular radio communication system, and the wireless access technology RAT of the radio communication between one or more travelling carriages of supporting to be used for community and to be connected to described community; Described cellular radio communication system adopts a kind of switching flow, wherein travelling carriage Ke Congyige community is switched to another community of supporting different radio access technologies RAT, and described cellular radio communication system further adopts a kind of flow process that reconnects, while being wherein connected to the travelling carriage generation Radio Link Failure RLF of Yi Ge community, can attempt reconnecting to another community of supporting different radio access technologies RAT; Described mobile station apparatus is characterised in that, described mobile station apparatus is used for:

When being connected to the first community, detect Radio Link Failure RLF;

In the second community, rebuild and connect; And

17. 1 kinds for providing the base station apparatus of information at cellular radio communication system, each cell arrangements Cheng You base station service in wherein said cellular radio communication system, and the wireless access technology RAT of the radio communication between one or more travelling carriages of supporting to be used for community and to be connected to described community; Described cellular radio communication system adopts a kind of switching flow, wherein travelling carriage Ke Congyige community is switched to another community of supporting different radio access technologies RAT, and described cellular radio communication system further adopts a kind of flow process that reconnects, while being wherein connected to the travelling carriage generation Radio Link Failure RLF of Yi Ge community, can attempt reconnecting to another community of supporting different radio access technologies RAT; Described base station apparatus is characterised in that, described base station apparatus is used for:

If same wireless access technology RAT is supported in described base station and described the first community, to described the first community, provide the information of relevant described Radio Link Failure RLF.