CN102474777B

CN102474777B - Apparatus and method for determining mobility state in wireless communication system

Info

Publication number: CN102474777B
Application number: CN201080025450.6A
Authority: CN
Inventors: 李圣民; 朴成埈; 郑圣勋; 千成德; 李承俊
Original assignee: LG Electronics Inc
Current assignee: LG Electronics Inc
Priority date: 2009-07-27
Filing date: 2010-07-26
Publication date: 2015-04-01
Anticipated expiration: 2030-07-26
Also published as: KR20110011554A; GB2482820A; GB2482820B; GB201120282D0; CN102474777A

Abstract

An apparatus and method of determining a mobility state is provided. A user equipment determines a size of a cell to be reselected by performing cell reselection, and determines the mobility state on the basis of the number of cell reselections and a size of the cell. Unnecessary cell reselection can be avoided even if the user equipment enters an area where a micro cell and a macro cell coexist.

Description

For determining the apparatus and method of the mobility status in wireless communication system

Technical field

The present invention relates to radio communication, and more particularly, relate to the method and apparatus for determining the mobility status in wireless communication system.

Background technology

Third generation partner program (3GPP) Long Term Evolution (LTE) is the improvement version of universal mobile telecommunications system (UMTS), and proposes as 3GPP release 8.3GPP LTE uses OFDM (OFDMA) in the downlink, and uses single-carrier frequency division multiple access (SC-FDMA) in the uplink.3GPP LTE adopts the multiple-input and multiple-output (MIMO) with nearly four antennas.In recent years, the 3GPP LTE-advanced (LTE-A) of the evolution as 3GPP LTE is discussed.

Propose closed subscriber group (CSG) with by only allowing the limited access of certain subscriber to provide good service quality.The base station that CSG can be provided to serve is called family eNodeB (HNB), and provides the community of the service through license to be called CSG cell to the subscriber of CSG.The basic demand of the CSG in 3GPP is open in 3GPP TS 22.220V1.0.1 (2008-12) " Service requirements for Home NodeBs and Home eNodeBs (Release9) ".

Community is selected to be the process selecting the community providing service to subscriber equipment.Cell reselection (reselection) is the process that gravity treatment is in the community of a state, and in a state in which, described subscriber equipment have selected described community by fully performing the selection of described community.

Determine mobility status to coordinate cell reselection according to the mobility of subscriber equipment.

CSG cell has the cell size (that is, the size of the coverage that by community provided) less than conventional cell.Because the community with various cell size coexists, thus when execution community select or when determining mobility status in a conventional manner, subscriber equipment may perform unnecessary cell reselection.

Summary of the invention

Technical problem

The invention provides by considering that cell size determines the method and apparatus of the mobility status of subscriber equipment.

Present invention also offers a kind of for performing by consideration cell size the method and apparatus selected community.

The solution of problem

In one aspect, a kind of method of mobility status of the subscriber equipment determined in wireless communication system is provided.The method comprises the following steps: determining will by performing cell reselection by the size of the community of gravity treatment; And determine the step of mobility status, this step determines described mobility status based on the number of times of cell reselection and the size of described community.

Described mobility status can be the one in conventional mobility, medium mobility and high mobility.

Describedly determine that the step of mobility status can comprise: if be less than medium mobility threshold value at the number of times of the described cell reselection of period mobility period (mobility period), then described mobility status is defined as described conventional mobility; If described mobility status between described medium mobility threshold value and high mobility threshold value, is then defined as described medium mobility by the number of times of the described cell reselection during the described mobility period; And if the number of times of described cell reselection during the described mobility period is greater than described high mobility threshold value, then described mobility status is defined as described high mobility.

The method can also comprise the following steps: determine whether to be used according to described cell size and indicate the value of the counter of the number of times of described cell reselection to increase progressively.

If the community of gravity treatment is Microcell, then the value of described counter can not be made to increase progressively.

Described Microcell can be closed subscriber group (CSG) community.

The method can also comprise the following steps: adjust reselection time based on described mobility status.

On the other hand, a kind of for determining that the subscriber equipment of mobility status comprises: radio frequency (RF) unit, it is for transmitting and receiving wireless signal; And the processor to couple with described RF unit, it is for determining described mobility status, wherein, described processor is configured to determine by performing cell reselection by the size of the community of gravity treatment, and to determine described mobility status based on the number of times of cell reselection and the size of described community.

The beneficial effect of the invention

Even if subscriber equipment enters the region that Microcell and macrocell coexist also can avoid unnecessary cell reselection.In addition, the mobility status of described subscriber equipment can correctly be determined.

Accompanying drawing explanation

Fig. 1 shows and applies wireless communication system of the present invention.

Fig. 2 shows the diagram of the radio protocol architecture of user plane.

Fig. 3 shows the diagram of the radio protocol architecture of control plane.

Fig. 4 shows subscriber equipment (UE) in idle mode and selects the diagram of the operation of community.

Fig. 5 shows for the exemplary diagram by using family's node B (HNB) gateway (GW) to manage the network architecture of HNB.

Fig. 6 shows the flow chart of the method being checked the access module of base station by UE.

Fig. 7 shows traditional residence reselecting.

Fig. 8 shows the cell reselection using reselection time.

Fig. 9 shows the situation not using reselection time.

Figure 10 shows an example of unnecessary cell reselection.

Figure 11 shows the flow chart of the residence reselecting according to one embodiment of the present invention.

Figure 12 shows the cell reselection of the mobility status according to UE.

Figure 13 shows an example to the false judgment that mobility status is made.

Figure 14 shows the flow chart of the method for the determination mobility status according to one embodiment of the present invention.

Figure 15 shows the flow chart of the method determining mobility status according to cell size.

Figure 16 shows the block diagram of the wireless communication system for realizing embodiments of the present invention.

Embodiment

Fig. 1 shows and applies wireless communication system of the present invention.This wireless communication system can also be called as Evolved UMTS Terrestrial Radio Access Network (E-UTRAN) or Long Term Evolution (LTE)/lte-a system.

E-UTRAN comprises at least one base station (BS) 20, BS 20 provides control plane and user plane to subscriber equipment (UE) 10.UE 10 can be fixing or movement, and can be called as other terms, such as travelling carriage (MS), user terminal (UT), subscriber stations (SS), mobile terminal (MT), wireless device etc.BS20 normally carries out the fixed station communicated with UE 10, and can be called as other terms, such as evolved node-B (eNB), base station transceiver system (BTS), access point etc.

BS 20 interconnects by means of X2 interface.BS 20 is also connected to Evolved Packet Core (EPC) 30 by means of S1 interface, more particularly, is connected to Mobility Management Entity (MME) by S1-MME, and is connected to gateway (S-GW) by S1-U.

EPC 30 comprises MME, S-GW and packet data network-gateway (P-GW).MME has the access information of UE or the ability information of UE, and this type of information is generally used for the mobile management of UE.S-GW has the gateway of E-UTRAN as end points.P-GW has the gateway of PDN as end points.

Based on lower three layers of open system interconnection (OSI) model known in communication system, the layer of the Radio interface protocols between UE and network can be classified as ground floor (L1), the second layer (L2) and third layer (L3).Wherein, physics (PHY) layer belonging to ground floor provides formation transfer service by using physical channel, and wireless heterogeneous networks (RRC) layer belonging to third layer is for the Radio Resource between control UE and network.For this reason, rrc layer exchanges RRC information between UE and BS.

Fig. 2 shows the diagram of the radio protocol architecture of user plane.Fig. 3 shows the diagram of the radio protocol architecture of control plane.User plane is the protocol stack for user data transmission.Control plane is the protocol stack for control signal transmission.

With reference to Fig. 2 and Fig. 3, formation transfer service is supplied to upper strata by physical channel by PHY layer.PHY layer is connected to medium access control (MAC) layer by transmission channel, and it is the upper strata of PHY layer.Between MAC layer and PHY layer, data are transmitted by transmission channel.According to how by wave point transmission data and utilize what characteristic to be classified to transmission channel by wave point transmission data.

Between different PHY layer, that is, between the PHY layer and the PHY layer of receiver of transmitter, transmit data by physical channel.Use OFDM (OFDM) scheme to modulate physical channel, and service time and frequency are as Radio Resource.

The function of MAC layer is included between logical signal and transmission channel and maps, and to by belong to logic channel, transmission block that the transmission channel of MAC service data unit (SDU) provides to physical channel carries out multiplex/demultiplex.MAC layer provides service by logic channel to wireless spread-spectrum technology (RLC) layer.

The function of rlc layer comprises RLC SDU cascade, segmentation and reassemble.In order to ensure the various service quality (QoS) required for radio bearer (RB), rlc layer provides three kinds of operator schemes, that is, transparent mode (TM), Unacknowledged Mode (UM) and affirmation mode (AM).AM RLC provides error correction by using HARQ (ARQ).

PDCP (PDCP) layer in user plane comprises user data delivery, header-compressed and encryption.The function of the PDCP in control plane comprises control plane data delivery and encryption/integrity protection.

Only define wireless heterogeneous networks (RRC) layer in the control plane.Rrc layer is used for controlling with the configuration of radio bearer (RB), reconfiguring and discharge the logic channel, transmission channel and the physical channel that are associated.RB is the logical path for the data delivery between UE and network provided by ground floor (that is, PHY layer) and the second layer (that is, MAC layer, rlc layer and PDCP layer).The configuration of RB means such process: specific radio protocol layer and the characteristic of channel are to provide special services and to determine respective detail parameters and operation.RB can be classified as two types, i.e. signaling RB (SRB) and data RB (DRB).SRB is used as the path of transmitting RRC information in the control plane.DRB is used as the path of transmitting user data in user plane.

Between the rrc layer and the rrc layer of network of UE, there is RRC when being connected, UE is in RRC_CONNECTED pattern, otherwise UE is in RRC_IDLE pattern.

Data are sent from network to UE by downlink transmission channel.The example of this downlink transmission channel comprises for the broadcast channel (BCH) of transmitting system information and the downlink sharied signal channel (SCH) for sending customer service or control message.Can at down link SCH or upper customer service or the control message sending Downlink multicast or broadcast service of additional downlink Multicast Channel (MCH).Data are sent from UE to network by uplink transmission channels.The example of uplink transmission channels comprises Random Access Channel (RACH) for sending initial control message and the up link SCH for sending customer service or control message.

Belong to the higher channel of transmission channel and the example being mapped to the logic channel on transmission channel comprises broadcast channel (BCCH), Paging Control Channel (PCCH), Common Control Channel (CCCH), multicast control channel (MCCH), Logical Traffic Channels (MTCH) etc.

Physical channel comprises the multiple symbol in time domain and the multiple subcarriers in frequency domain.Subframe comprises the multiple symbols in time domain.A subframe comprises multiple Resource Block.A Resource Block comprises multiple symbol and multiple subcarrier.In addition, each subframe can use the specific subcarrier of the special symbol (such as, the first symbol) of the corresponding subframe of physical downlink control channel (PDCCH) (that is, L1/L2 control channel).Transmission time interval (TTI) is the unit interval that data send, and is 1 millisecond (ms) corresponding to a subframe.

Hereinafter, the RRC state of open UE is connected with RRC.

RRC state represents whether the rrc layer of UE is connected to the rrc layer of E-UTRAN in logic.If two layers are connected to each other, be then called RRC_CONNECTED state, and if two layers are not connected to each other, be then called RRC_IDLE state.When being in RRC_CONNECTED state, UE has RRC and connects, and E-UTRAN can identify the existence of UE in cell unit thus.Therefore, UE can be controlled effectively.On the other hand, when being in RRC_IDLE state, UE cannot be identified by E-UTRAN, and is managed by the core network in tracing area unit, and this tracing area unit is the unit with the region wider than community.Also namely, for the UE being in RRC_IDLE state, in wide area unit, only identify whether UE exists.In order to obtain the typical mobile communications service of such as voice or data, the transformation to RRC_CONNECTED state is necessary.

When user opens UE at first, first UE searches for suitable community, and is in RRC_IDLE state in the cell afterwards.Only when RRC connection set up by needs, the UE being in RRC_IDLE state just sets up the connection with E-UTRAN by RRC connection procedure, and is then converted to RRC_CONNECTED state.The UE being in RRC_IDLE state needs the example setting up the situation that RRC connects to be different, such as because the phone of user is attempted etc. thus need the situation of uplink data transmission, or send the situation of response message in response to the beep-page message received from E-UTRAN.

Non-Access Stratum (NAS) layer belongs to the upper strata of rrc layer, and for performing session management, mobile management etc.

In order to manage the mobility of UE in NAS layer, define two states, i.e. EPS mobile management-REGISTERED (EMM-REGISTERED) state and EMM-DEREGISTERED state.These two states are applied to UE and MME.At first, UE is in EMM-DEREGISTERED state.In order to access network, UE performs the process to network registry by initial attachment process.If for successfully completing attach procedure, then UE and MME enters EMM-REGISTERED state.

In order to the signaling managed between UE and EPC connects, define two states, that is, EPS Connection Management (ECM)-IDLE state and ECM-CONNECTED state.These two states are applied to UE and MME.When the UE foundation being in ECM-IDLE state is connected with the RRC of E-UTRAN, UE enters ECM-CONNECTED state.When the MME foundation being in ECM-IDLE state is connected with the S1 of E-UTRAN, MME enters ECM-CONNECTED state.When UE is in ECM-IDLE state, E-UTRAN does not have the contextual information of UE.Therefore, the UE being in ECM-IDLE state performs the process relevant to the mobility based on UE, and such as community is selected or gravity treatment, and does not need the order receiving network.On the other hand, when UE is in ECM-CONNECTED state, the mobility of UE is by the order management of network.If the position that the position being in the UE of ECM-IDLE state becomes known from network is different, then UE is by the position of tracking area update process to network-reporting UE.

Next, system information will be disclosed.

System information comprises the essential information that UE access BS must know.Thus, UE must receive all system informations before access BS.In addition, UE always needs to have up-to-date system information.Because the information that the whole UE in system information Shi Yige community must know, so BS periodically transmitting system information.

5.2.2 according to 3GPP TS 36.331 V8.4.0 (2008-12) saves " Radio Resource Control (RRC); Protocol specification (Release 8) ", system information is classified as Master Information Block (MIB), Scheduling Block (SB) and system information block (SIB).MIB makes UE can know the physical configuration (such as, bandwidth) of specific cell.SB reports the transmission information (such as, transmitting the period etc.) of SIB.SIB is the group of the multiple system informations be relative to each other.Such as, SIB only comprises the information of neighbor cell, and another SIB only comprises the information of the uplink radio channel that UE uses.

Usually, the following three types that will describe can be classified as by network to the service that UE provides.In addition, according to anything can be provided to serve, cell type is identified as different types by UE.Below first will describe COS, and then will describe cell type.

1) limited service: this service provides urgent call and earthquake and tsunami warning system (ETWS), and can provide in acceptable cell.

2) regular service: this service represents general public use service, and can provide in the community of suitable or routine.

3) carrier service: this service represents the service of network to service provider, and community can only be used by Internet Service Provider, and can not be used by common user.

The COS that community provides can identify as follows.

1) acceptable cell: UE can receive limited service in the cell.From the angle of UE, this community is not prohibited, and meets the cell selection standard of UE.

2) suitable community: UE receives regular service in the cell.This community meets the condition of acceptable cell, and meets additional conditions.About additional conditions, this community must belong to the PLMN that UE can access, and cannot forbid the tracking area update process of UE in the cell.If specific cell is CSG cell, Ze Gai community must be accessible as the UE of CSG member.

3) community is forbidden: broadcasting indicating cell by use system information is in the cell the information of forbidding community.

4) community is retained: broadcasting indicating cell by use information system is in the cell the information retaining community.

Fig. 4 illustrates that UE selects the diagram of the operation of community in idle mode.

UE selects wireless access technology (RAT) for communicating with public land mobile network (PLMN), and UE itself expects to receive service (S410) from PLMN.The information of PLMN and RAT can be selected by the user of UE, and also can use the information of PLMN and RAT stored in USIM.

UE has in the community of the value larger than particular value the community (S420) selecting to have maximum in signal strength signal intensity and quality in measured base station.Then, it receives the system information sent by base station.Described particular value represent by system definition, for guaranteeing that data send and/or receive time the value of quality of physical signalling.Therefore, this value can change based on the RAT that will apply.

If need network registry, then UE registers the information (such as, IMSI) of himself, so that from network reception service (such as, paging) (S430, S440).Whenever selecting community, UE is not registered to the network that will access.Such as, the system information of the network registered (such as, tracing area mark (TAI)) is different from the network information that UE self knows.

If by UE from its base station measurement receiving service to signal strength signal intensity and the value of quality be less than by the base station measurement of neighbor cell to value, then described UE selects a community (S450) in other communities of the better signal of characteristic of the signal providing the community of the base station characteristically accessed than described UE to provide.This process is called as cell reselection, to be selected to distinguish mutually in itself and the initial cell in step S420.Now, can fixed time restrictive condition, to prevent change based on characteristics of signals and frequent re-selecting cell.

Next, the process being selected community by UE will be described in detail.

If UE is opened or camp-on on community, then UE can perform selection/reselection have suitable quality community in case receive service process.

The UE being in RRC_IDLE state needs the community always selecting to have suitable quality, and is prepared for thus receiving service by described community.Such as, the UE be just opened selects the community with suitable quality to be registered in network, if the UE being in RRC_CONNECTED state enters RRC_IDLE state, then this UE should select the community of self camp-on of this UE.By this way, select the community meeting predetermined condition so that the process of camp-on is called as community selection in service wait state (such as RRC_IDLE state) by UE.Described community is selected to be performed under the current state not determining oneself community of camp-on in RRC_IDLE state of this UE of UE, and therefore selects community to be very important as quickly as possible.Therefore, if there is the community providing the radio signal quality being greater than predeterminated level, Ze Qi community can be selected by UE, even if this community is not to provide the community of optimal wireless signal quality during selecting process.

Hereinafter, will describe by referring to open 3GPP TS 36.304 V8.3.0 (2008-09) " User Equipment (UE) procedures in idle mode (Release 8) " Method and Process being selected community by UE in detail.

If initial opening power, then UE searches for available PLMN, and selects suitable PLMN to receive service.Subsequently, UE selects to receive the suitably signal quality of service and the community of characteristic in the community provided by selected PLMN.

This community selects process can be classified as two types.

One type is that process is selected in initial cell, and in this process, UE does not have the previous message relevant with wireless channel.Therefore, this UE searches for all wireless channels to find suitable community.In each channel, the community that UE search is the strongest.Subsequently, if having found the suitable community meeting cell selection standard, then UE selects corresponding community.

Another type uses the community of the information stored to select process, and in this process, UE is used in this UE the information relevant with wireless channel stored, or select community by using from the information of Cell Broadcast CB.Therefore, compared with selecting process with initial cell, community can be selected rapidly.If have found the community meeting cell selection standard, then this UE selects corresponding community.If do not find the community meeting cell selection standard, then this UE performs initial cell and selects process.

UE selects the cell selection standard used in process can represent according to shown formula in community:

Formula Fig. 1

[formula 1]

S _rxlev＞0

Wherein, Srxlev=Qrxlevmeas-(Qrxlevmin+Qrxlevminoffset)-Pcompensation, Qrxlevmeas represents the community reception level (RSRP) measured, Qrxlevmin represents the minimum required reception level (dBm) in community, Qrxlevminoffset represents the skew to Qrxlevmin, Pcompensation=max (PEMAX-PUMAX, 0) (dB), PEMAX represents in respective cell for the maximum transmission power (dBm) that UE allows, and PUMAX represents the maximum transmission power (dBm) of the UE wireless transmitting unit of the performance based on UE.

In above formula 1, can find out, UE selects to have the value than by the large measure signal intensity of the particular value provided specified by the community of service and quality.In addition, the parameter used in above formula 1 is broadcasted via system information, and UE receives these parameter values they are used for cell selection standard.

If UE have selected the community meeting cell selection standard, then this UE is received in the information needed for the operation of RRC_IDLE pattern of UE in respective cell from the system information of respective cell.This UE receives the full detail needed for the operation of RRC_IDLE pattern, and then waits for to network request service (such as, making a call) or from network reception service (such as, end call) in idle mode.

After UE selects certain community of processing selecting via community, the signal strength signal intensity between UE and base station and quality may change due to the change of UE mobility and wireless environment.Therefore, if the deterioration of selected community, then UE can select another community providing good quality.By this way, if re-selecting cell, then usually select the community that signal quality more better than the signal quality of the community of current selection is provided.This process is called as cell reselection.The basic object of cell reselection process normally provides the community of best in quality from the angle Selection of radio signal quality to UE.

Except the angle of radio signal quality, network can by notifying its priority for each frequency determination priority to UE.First the UE having received priority can consider this priority during cell reselection process before consideration radio signal quality standard.

As mentioned above, there is a kind of characteristics of signals based on wireless environment to select or the method for re-selecting cell.When re-selecting cell, in the process selecting the community being used for gravity treatment, based on RAT and the frequency characteristic of community, residence reselecting described below can be there is.

-with frequently (intra-frequency) cell reselection: gravity treatment has the community of the similar centre frequency of the RAT of the current community used with UE.

-alien frequencies (inter-frequency) cell reselection: gravity treatment has the community of the different centre frequency of the RAT of the community that using current from UE.

Cell reselection between-REAT: gravity treatment has the community of the different RAT of the RAT that using current from UE.

The principle of cell reselection is as follows.

First, UE can measure the quality of the quality of Serving cell and/or the neighbor cell for cell reselection.

Secondly, cell reselection can be performed based on cell reselection criteria.Cell reselection criteria has the following characteristic relevant with the measurement of community.

Co-frequency cell gravity treatment can be performed based on the rank of community.Rank can be the process defining ranking criteria and the order based on this ranking criteria arrangement community.The community of the highest rank is called as best rank community.Rank value can be the measurement result provided by UE, or can be the value through regulating applying frequency shift (FS) or cell offset to measurement result.

The priority of the frequency that can provide based on BS performs alien-frequency district gravity treatment.UE can be in camp-on on community in the frequency with limit priority.Network can provide frequency priority via broadcast signaling or via dedicated signaling to UE.

For alien-frequency district gravity treatment, network can be provided for each UE the parameter (such as, frequency particular offset) that uses when cell reselection.

For with frequently or alien-frequency district gravity treatment, network can be provided for each UE the neighbor cell list (NCL) that uses when cell reselection.NCL can comprise cell-specific parameters (such as, cell specific offset).

For with frequently or alien-frequency district gravity treatment, network can provide to each UE that comprise should by the blacklist of multiple communities of gravity treatment.The community be included in blacklist cannot be used for cell reselection.

Hereafter the rank of community will be described in further detail.

Ranking criteria for carrying out rank to community is defined as follows:

Formula Fig. 2

[formula 2]

Rs＝Q _meas，s+Qhyst，Rn＝Q _meas，n-Qoffset

Wherein, Rs represents the rank value of Serving cell, Rn represents the rank value of neighbor cell, Qmeas, s represents the quality of the Serving cell measured by UE, and Qmeas, n represent the quality of the neighbor cell measured by UE, Qhyst represents the lagged value for rank, and Qoffset represents the skew between Liang Ge community.

In the reuse adoption process of co-frequency cell, if UE receives the skew Qoffsets between Serving cell and neighbor cell, n, then Qoffset=Qoffsets, n.Otherwise, Qoffset=0.

In the reuse adoption process of alien-frequency district, if UE receives skew Qoffsets, n, then Qoffset=Qoffsets, n+Qfrequency.Otherwise, Qoffset=Qfrequency.

If the rank value of Serving cell and neighbor cell does not have too many difference each other, and constantly changes, then the rank of Serving cell and neighbor cell can frequently change.Thus, Serving cell and neighbor cell may be alternately elected to be new Serving cell too continually.In order to address this problem, lagged value Qhyst can be used.

UE can use formula (2) to determine the rank of Serving cell and neighbor cell, the community having a more high ranking value than another community in Serving cell and neighbor cell best rank community can be defined as, and best rank community new Serving cell can be elected to be.

In above-mentioned cell reselection criteria, when performing cell reselection, the quality of community is considered most important factor.If the community of gravity treatment is not suitable community, then UE can get rid of the frequency of the community of described gravity treatment or the community of described gravity treatment.

Now, description is regulated the influential speed of the cell reselection of the translational speed depending on UE.

When UE with fast speed by community time, may exist correctly do not perform cell reselection and UE cannot the situation of camp-on on specific cell.This problem is by for preventing the reselection time of unnecessary cell reselection (that is, Treselection) from causing.

If the signal strength signal intensity of the neighbor cell measured by UE during Treselection is greater than particular value, then perform cell reselection, and if the translational speed of UE is fast, then there is the situation by using existing Treselection cannot meet cell re-selection conditions.Therefore, if the translational speed of UE changes, then reduce Treselection, to make to meet cell re-selection conditions under translational speed faster, this is called as speed and regulates.Determine that the speed of UE changes by the number of times of the cell reselection carried out during special time period and particular value being compared.

Hereinafter, closed subscriber group (CSG) will be described.

The base station providing CSG to serve is called family Node B (HNB) or family eNB (HeNB) in 3 gpp.Hereinafter, both HNB and HeNB are referred to as HNB.The object of HNB is only provide proprietary service to the member of CSG substantially.But the operator scheme based on HNB is arranged, also these can be provided to serve to other users beyond CSG.

Fig. 5 shows for the exemplary diagram by using HNB gateway (GW) to manage the network architecture of HNB.

HNB can be connected to EPC via HNB GW, or is connected directly to EPC.Herein, HNB GW is considered to the typical BS for MME.And HNB GW is considered to the MME for HNB.Therefore, S1 interface is connected between HNB and HNB GW, and S1 interface is also connected between HNB GW and EPC.In addition, even if when directly connecting between HNB and EPC, it also connects via S1 interface.The function of HNB is almost similar to the function of typical BS.

Usually, compared with the BS had with mobile communication service provider, HNB has lower wireless transmission power output.Therefore, the service coverage that HNB provides is less than the service coverage that (e) NB provides usually.Due to this class feature, from the angle of service coverage, the community that HNB provides is classified as Femto cell, different from the macrocell that (e) NB provides.

From the angle of provided service, when HNB only provides those to serve to CSG group, the community provided by this HNB is called CSG cell.

Each CSG has himself identifier, is called as CSG ID (CSG mark).UE can have the CSG list that UE self belongs to as members, and this CSG list can be changed by the order of the request of UE or network.In current 3GPP specification, a HNB can support a CSG.

UE can have the list of the CSG that UE belongs to as members.This list is called CSG whitelist.

The CSG ID of the CSG that HNB himself is supported by system information delivery, thus only allow corresponding CSG member UE to access.When UE finds CSG cell, can check that this CSG cell is supporting the CSG of what type by reading the CSG ID be included in system information.Only when UE self is the member of corresponding CSG cell or the CSG corresponding with CSG ID is included in the CSG whitelist of UE, respective cell just shows for accessible community by the UE having read CSGID.

HNB is not always needed to allow CSG UE access.Configuration based on HNB is arranged, and non-CSG member UE can be allowed to access.The type of the UE of access is allowed to arrange based on the configuration of HNB and to change.Herein, configuration arranges the setting of the access module (or can be called operator scheme) representing HNB.Based on the type of UE, the access module of HNB can be divided into following three types.

1) access module is closed: the pattern that service is only provided to specific CSG member.CSG cell is provided by HNB.

2) access module is opened: to provide the pattern of service without any the mode of specific CSG member's restriction (being similar to typical case (e) NB).HNB provides the typical cell of not CSG cell.For the sake of clarity, macrocell is the community by open access module operation.

3) access module is mixed: provide CSG to serve to specific CSG member and the pattern of service is also provided to non-CSG member (being similar to typical cell).It is identified as CSG cell for CSG member UE, and is identified as typical cell for non-CSG member.This community is called mixed cell.

HNB notifies that the community that UE is being served by himself is CSG cell or typical cell, knows whether it can access respective cell to allow UE.It is CSG cell via system information broadcast to close the HNB managed under access module.By this way, HNB allows system information to comprise CSG designator, and this CSG designator indicates in system information whether the community served by himself is CSG cell.

Such as, CSG cell is broadcasted by CSG designator being set to " TRUE (very) ".If be not just CSG cell in serviced community, then can use such method, namely CSG designator can be set to " FALSE (vacation) " or omit the transmission of CSG designator.UE should distinguish typical cell and CSG cell, and typical BS also can send CSG designator (such as thus, be set to the CSG designator of " FALSE "), thus UE can be known, and the cell type himself provided is typical cell.In addition, typical BS also can not send CSG designator, thus UE can be known, and the cell type himself provided is typical cell.

The parameter relevant to CSG sent by respective cell for each cell type is illustrated in table 1.The parameter relevant to CSG can be sent via system information.

Table 1

[table 1]

[table]

Illustrate in table 2 each cell type allow the type of UE that accesses.

Table 2

[table 2]

[table]

	CSG cell	Typical cell
			Do not support the UE of CSG	Refusal access	Accept access
Non-CSG member UE	Refusal access	Accept access
			CSG member UE	Accept access	Accept access

UE checks the CSG designator in the system information of Target cell, and what (S510) is the type of Target cell for confirmation be.

After inspection CSG designator, if CSG designator indicating target community is CSG cell, then respective cell is identified as CSG cell (S520, S530) by UE.CSG ID in UE check system information, to check that whether UE self is the CSG member (S540) of Target cell.

If check out that UE is the CSG member of Target cell according to CSG ID, then this respective cell will be identified as accessible CSG cell (S550, S560).If check out that UE is not the CSG member of Target cell according to CSG ID, then this respective cell will be identified as not can be accessed by CSG cell (S550, S570).

If CSG designator indicating target community is not CSG cell, then target cell identification is typical cell (S520, S580) by UE.In addition, if do not send CSG designator in step S510, then target cell identification is typical cell by UE.

Usually, CSG cell and macrocell can be managed under characteristic frequency simultaneously.CSG dedicated frequency is the frequency of only CSG cell existence.Mixed carrier frequency is the frequency that CSG cell and macrocell all exist.Network can accord with by the physical-layer cell identifier retained in mixed carrier frequency for CSG cell.This physical-layer cell identifier symbol is called Physical Cell Identifier (PCI) in E-UTRAN, and is called physics scrambler (PSC) in utran.For the sake of clarity, will represent that physical-layer cell identifier accords with by PCI.

CSG cell notifies the information relevant with the PCI retained for CSG cell at ongoing frequency place via system information.When discovery specific cell, corresponding frequencies place, according to the PCI of this community, the UE receiving this information can determine whether this community is CSG cell.To illustrate when the UE of two types how UE uses this information below.

First, when UE does not support the function relevant to CSG or do not have the CSG list belonging to UE self, during community selection/reselection process or switching, UE does not need CSG cell to be considered as selecting community.In this case, if PCI be for CSG retain PCI, the selection/reselection process of Ze community or switch during, UE only checks the PCI of community, and UE can eliminate corresponding community immediately then.Usually, during the process of existence checking respective cell in physical layer, the PCI of specific cell can be known by UE immediately.

Secondly, when UE has the CSG list belonging to UE self, when UE wants the list of the adjacent C SG community knowing mixed carrier frequency place, it is appreciated that, only when finding the community had for the PCI of CSG reservation, respective cell is only CSG cell, instead of check individually each community found in whole PCI scope system information CSG mark.

Hereinafter how description is performed the cell reselection relevant to CSG cell.

CSG cell is the community of the service (that is, CSG service) for providing good quality to its member UE.Because UE is usual than obtaining the service with better service quality (Qos) in non-CSG cell in CSG cell, so when UE is in CSG cell during camp-on, even if having found the alien frequencies that priority ratio service frequency is higher, the selection of another community also may be improper in QoS.

In order to the alien frequencies place that prevents priority ratio service frequency higher during re-selection process community alternative service CSG cell and selected, as long as UE can suppose that service CSG cell is assessed as the best rank community in corresponding frequencies, service frequency just has limit priority in every other frequency.

The frequency priority of CSG cell and the CSG cell of gravity treatment alien frequencies is not considered but not with the non-CSG cell of frequency/alien frequencies in order to encourage UE, as long as UE can suppose that CSG cell is assessed as the best rank community in corresponding frequencies, the frequency of this CSG cell just has limit priority in every other frequency.

When UE is when without any when giving characteristic frequency limit priority when definite network signaling, this frequency priority can be called " implicit expression limit priority ".By this way, likely help UE when not violating the existing cell reselection rules based on the priority execution cell reselection of frequency, camp-on in CSG cell as much as possible.

Fig. 7 shows traditional residence reselecting.

UE camp-on in CSG cell (S710).

Because the Serving cell of this UE is CSG cell, so can to service frequency assignment implicit expression limit priority (S720).

UE can measure the quality (S730) of service CSG cell and neighbor cell.

UE can based on measurement result application normal reselection rule (S740) performed in step S730.More particularly, UE can search for the community of best rank in the frequency higher than service frequency priority.If do not find best rank community from the frequency higher than service frequency priority, then UE can search for the community of best rank in the frequency with the priority identical with service frequency.If from not finding best rank community the frequency with the priority identical with the priority of service frequency, then UE can search for best rank community in the frequency lower than the priority of service frequency.

If have found new community (S750), then UE can this new community (S760) of gravity treatment.

If the community of institute's gravity treatment is non-CSG cell, then UE can cancel the implicit expression limit priority distributing to service CSG cell, and the frequency priority provided by network can be used for cell reselection.

If UE have found new best rank CSG cell from the frequency with the priority identical with service frequency, then UE can determine to reside in current service CSG cell or the best rank CSG cell that gravity treatment is new.

In cell reselection process, UE uses and determines that whether cell reselection is necessary from the reselection time (that is, Treselection) of network reception.But, according to traditional method, in the community (this type of community is called as Microcell) with less cell size of such as CSG cell and the situation of conventional cell (this type of community is called as macrocell), unnecessary cell reselection may be performed.

Fig. 8 shows the cell reselection using reselection time.If UE moves to community B from community A, then the signal quality of community A is deteriorated, and the signal quality of community B improves.

If the signal quality of community A is less than first threshold Th1, and the signal quality of community B is greater than Second Threshold Th2, then reselection timer Tr starts (810).First threshold Th1 and Second Threshold Th2 can be equal to each other, or can meet Th1 > Th2 or Th1 < Th2.

Reselection time (that is, Treselction) is the timer value of reselection timer Tr.If the signal quality of community B is greater than Second Threshold Th2 (and/or the signal quality of community A is less than first threshold Th1) until reselection timer Tr is overtime always always, then UE selects community B (820).

Treselection is used for preventing from unnecessarily frequently cell reselection occurring.

Fig. 9 shows the situation not using reselection time.In this case, when UE resides in the boundary between community A and community B, UE is re-selecting cell A and community B repeatedly.By using Treselection, even if UE resides in the boundary between Liang Ge community, also unnecessary cell reselection can be avoided.

Usually, in order to reduce the delay occurred in cell reselection process, Treselection is set to relatively little value (such as, 1 second or 2 seconds).According to 3GPP TS 36.331, Treselection can be set to the value in 0 second to 7 seconds scope.

But, if UE has the region of the Microcell (such as, CSG cell) of less cell size by existing, then may exist there is less cell size CSG cell by the situation of continuous gravity treatment.When UE only passes through near CSG cell, if CSG cell in cell reselection process by gravity treatment, then the battery consumption of UE may be caused to increase.

When UE is by Microcell, even if use existing Treselection, also unnecessary cell reselection may cannot be prevented.Although Treselection is set to maximum 7 seconds, if the average walking speed of hypothesis people is 3.0km/h, then the coverage in the region that can be covered by Treselection is about 5.8m.If therefore for the coverage of community is 10-20m, then may there is such problem, even if that is, UE is by Microcell, UE also can unnecessarily gravity treatment Microcell.

Figure 10 shows an example of unnecessary cell reselection.Community A and community B is macrocell, and community C and community D is included in the Microcell in the coverage of community A.Treselection is 1 second.

UE camp-on (step 1010) on the A of community at first.

Along with UE is close to community C, if the signal quality of community C is greater than threshold value during Treselection always, then re-selecting cell C (step 1020).

Along with UE leaves community C, if the signal quality of community A is greater than threshold value during Treselection always, then re-selecting cell A (step 1030).

Equally, UE re-selecting cell D (step 1040), and re-selecting cell A (step 1050) again.

When Microcell (such as CSG cell) uses the Treselection value identical with the Treselection value used in macrocell, along with UE moves, continue cell reselection.Repeatedly performing cell reselection can cause the battery consumption of UE to increase.

According to proposed method, identifying will by the size of the community of gravity treatment, and according to cell size application Treselection.

By making UE can use for cell size the Treselection be applicable in cell reselection process, UE is prevented to carry out unnecessary cell reselection.Such as, in order to prevent UE unnecessarily gravity treatment Microcell, Treselection can be set to higher than the value being used for Microcell (such as, being greater than the value of 7 seconds).

UE arranges Treselection (step S1110) according to cell size.In order to arrange Treselection according to cell size, UE can receive reselecting parameters from BS (that is, Serving cell).

In one embodiment, reselecting parameters can comprise the information relevant with the Treselection value of each community according to cell size.Such as, reselecting parameters can comprise the Treselection T for Microcell _microand/or for the 2nd Treselection T of macrocell _macro.

In another embodiment, reselecting parameters can comprise the information for arranging Treselection according to cell size.Such as, reselecting parameters can comprise the information relevant with scale factor β.There is the Treselection T for macrocell _macrowhen, the Treselection of Microcell is T _micro=β * T _macro.In this case, β can meet β > 1.

Reselecting parameters can be reported to UE by the part in system information, RRC information, MAC message or PDCCH by BS.

UE measures the signal quality (step S1120) of neighbor cell.

UE determines the size (step S1130) of neighbor cell.The method of cell size is determined in present description.

Although there has been described UE to determine cell size after beginning mass measurement, can with whether start mass measurement and independently determine cell size.

UE is by considering that the size of neighbor cell performs cell reselection (step S1140).If the signal quality of neighbor cell is greater than threshold value (if and/or the signal quality of Serving cell be less than threshold value), then reselection timer starts.In this case, Treselection is determined according to cell size.Such as, if neighbor cell is Microcell, then use a Treselection T _microand if neighbor cell is macrocell, then use the 2nd TreselectionT _macro.The signal quality of neighbor cell is maintained during Treselection, then the corresponding community of gravity treatment.

Now, the method being determined cell size by UE will be described.

In one embodiment, UE can determine cell size by Based PC I.After the master sync signal receiving neighbor cell and auxiliary synchronous signals, UE can obtain PCI.N is obtained from master sync signal ⁽²⁾ _iD, and N is obtained from auxiliary synchronous signals ⁽¹⁾ _iD.PCI＝3N ⁽¹⁾ _ID+N ⁽²⁾ _ID。Because N ⁽¹⁾ _iDscope be from 0 to 2, and N ⁽²⁾ _iDscope be from 0 to 167, so the sum of PCI is 504.

Different cell types can have different PCI.Such as, suppose that whole PCI set is called as PCI _total, then the PCI set for Microcell is called PCI _micro.PCI for macrocell gathers PCI _macrocan be PCI _macro=PCI _total-PCI _micro.Therefore, if UE checks the PCI of neighbor cell, then UE can know that the type of neighbor cell is macrocell or Microcell.

In another embodiment, UE can determine cell size based on the cell size designator sent from BS.

Cell size designator can be reported to UE by the part in system information, RRC information, MAC message or PDCCH by BS.Cell size designator can be included in the measurement configuration messages of the measurement for configuring neighbor cell.

Cell size designator can be 1 bit field.Such as, if cell size designator is set to " 0 ", then it can indicate macrocell, and if cell size designator is set to " 1 ", then it can indicate Microcell.

CSG designator can be regarded as cell size designator by UE.Because the coverage that CSG cell service is less, so when CSG designator instruction respective cell is CSG cell, CSG cell can be regarded as Microcell by UE.

Cell size designator can comprise various bit field.By the combination of various bit field, cell size designator can represent various cell size.

UE can receive cell size designator and/or CSG designator.Information (that is, PCI, cell size designator and/or CSG designator) for cell size can store in memory by UE.UE based on the information in memory, can switch or identify during cell reselection the cell size of neighbor cell.

According to proposed method, even if UE enters the region that Microcell and macrocell coexist, also unnecessary cell reselection can be avoided.In addition, UE can carry out restricted cell gravity treatment according to cell size.

Now, by a kind of method determining the mobility status of UE according to cell size of description.

In the above-described embodiment, unnecessary cell reselection is avoided by directly adjusting Treselection according to cell size.In contrast, below describe according to cell size determine UE mobility status and based on the method for determination result re-selecting cell.

5.2.4.3 according to 3GPP TS 36.304 V8.3.0 (2008-09) saves, and based on the number of times of re-selecting cell during special time period, the mobility status of UE is classified as conventional mobility, medium mobility and high mobility.

Determine that the method for the mobility status of UE is as follows.In order to determine medium mobility except conventional mobility and high mobility, use three parameters, that is, mobility period TCR, medium mobility threshold value N _cR-Mwith high mobility threshold value N _cR-H.

If during the mobility period, the number of times of cell reselection is between N _cR-Mwith N _cR-Hbetween, then mobility status is defined as medium mobility.

If during the mobility period, the number of times of cell reselection is greater than N _cR-H, then by mobility status determination high mobility.

Along with the translational speed of UE increases, the wireless quality of the community measured by UE changes fast.In order to make UE suitably perform cell reselection, be necessary to reduce Treselection value.If this is because Treselection is not along with the translational speed of UE changes, then UE at UE with the state Xia community of the fast speed movement resident time being similar to Treselection, and do not have re-selecting cell thus, this may cause UE cannot receive the problem of service.

Figure 12 shows the cell reselection of the mobility status according to UE.Treselection is 3 seconds in the subgraph (A) of Figure 12, and is 1 second in the subgraph (B) of Figure 12.Suppose that community A is macrocell, and community B, community C and community D are Microcells.

With reference to the subgraph (A) of Figure 12, even if UE moves according to the order of community A, community B, community C and community D in the state of community A, UE also cannot select any community in community B, community C and community D, because do not meet relatively large Treselection.

With reference to the subgraph (B) of Figure 12, UE moves according to the order of community A, community B, community C and community D in the state of community A, and Treselection becomes relatively short thus.Therefore, UE re-selecting cell B, community C and community D successively.

By determining mobility status, UE can regulate Treselection, and Treselection is according to one of mobility factor determining cell reselection of UE.If mobility is high, then Treselection reduces.

But, if by means of only being used in the number of times of the situation small area gravity treatment that macrocell and Microcell coexist to determine the mobility status of UE, then the Treselection value of mistake may be determined.

When macrocell On-premise Microcell, even if the translational speed of UE does not change, also frequently cell reselection may be there is owing to there is Microcell.Therefore, when using the method for traditional determination mobility status, UE may determine mobility status improperly.

When UE determines mobility status improperly, the Treselection value of mistake may be determined.In this case, even if speed does not change, also can be defined as high-mobility state, and thus reduce Treselection.Therefore, unnecessary cell reselection may be performed.

Figure 13 shows an example to the false judgment that mobility status is made.

With reference to the subgraph (A) of Figure 13, when UE moves from macrocell A to macrocell B, perform a cell reselection when there is not Microcell.On the other hand, when there is Microcell (that is, community C and community D), three cell reselections are performed.

Therefore, although the translational speed of UE does not change, perform cell reselection more continually, and mobility status may change to medium mobility or high mobility from conventional mobility thus.

Therefore, according to the change of mobility status, Treselection shortens, and may perform cell reselection more continually.

With reference to the subgraph (B) of Figure 13, because in the subgraph (A) of Figure 13, Treselection shortens, so perform cell reselection more continually.Suppose that its mobility status is changed into high mobility by UE, and Treselection shortens thus in the subgraph (A) of Figure 13.

If used for the ambulant Treselection of routine, then gravity treatment may have community E or the community F of little coverage.But, because UE reduces Treselection, so the community E that when UE can move in the B of community, gravity treatment is all, community F and community G.

Therefore, the power consumption that there is UE increases and wastes the problem of Radio Resource due to unnecessary signaling.

Therefore, in proposed method, by considering that cell size estimates the mobility status of UE.

UE obtains mobility determination parameter and gravity treatment scale parameter (step S1410).Mobility determination parameter comprises mobility period T _cR, medium mobility threshold value N _cR-Mwith high mobility threshold value N _cR-H.Gravity treatment scale parameter comprises medium mobility scale factor S _cR-Mwith high mobility scale factor S _cR-H.Herein, S _cR-H< S _cR-M< 1.

Mobility determination parameter and/or gravity treatment scale parameter can be reported to UE by the part in system information, RRC information, MAC message or PDCCH by BS.Mobility determination parameter and gravity treatment scale parameter can be sent by a parameter, or can be sent by independently message.

UE performs cell reselection (step S1420).When the signal quality of Serving cell is lower than threshold value, UE measures the signal quality of neighbor cell.If the signal quality of neighbor cell is greater than threshold value (if and/or the signal quality of Serving cell be less than the signal quality of threshold value and/or neighbor cell better than the signal quality of Serving cell), then reselection timer starts.If maintain the signal quality of neighbor cell during Treselection, then gravity treatment respective cell.

UE determines mobility status (step S1430) according to cell size.

UE regulates Treselection (step S1440) according to determined mobile status.When UE changes to medium mobility from conventional mobility, Treselection is multiplied by medium mobility scale factor S _cR-M.When UE changes to high mobility, Treselection is multiplied by high mobility scale factor S _cR-H.

The Treselection that UE is crossed by Use Adjustment performs cell reselection.

UE determines the size (step S1431) of the community of gravity treatment.As mentioned above, UE at least one in Based PC I, cell size designator, CSG designator and previously stored information can determine cell size.

If the community of gravity treatment is macrocell (step S1432), then Counter Value is not made to increase progressively.If the community of gravity treatment is Microcell, then Counter Value is made to increase progressively (step S1433).This means, the community with little cell size is disregarded in the number of times of cell reselection.

The number of times of counter indicating cell gravity treatment.Determine whether the mobility status of UE changes based on Counter Value.

Determine whether be greater than N in mobility period time period counter value _cR-M(step S1434).If Counter Value is less than N _cR-M, then mobility status is defined as conventional mobility (step S1436).

If Counter Value is greater than N _cR-M, then determine whether be greater than N in mobility period time period counter value _cR-H(step S1435).

If Counter Value is less than N _cR-H, then mobility status is defined as medium mobility (step S1437).If Counter Value is greater than N _cR-H, then mobility status is defined as high mobility (step S1438).

Even if UE enters the region that Microcell and macrocell coexist, the mobility status of UE also correctly can be determined.Therefore, unnecessary cell reselection can be avoided.

The method proposed can be applied to various process to support the mobility of UE.Such as, for switching, UE can to the measurement result of cell-of-origin (that is, current service cell) reporting objectives community.During trigger period, if measurement result meets reporting event, then UE can report measurement results.Can be used for proposed regulating the technology of Treselection to be applied to according to cell size and regulate according to cell size the trigger period being used for switching.

BS 50 can comprise processor 51, memory 52 and radio frequency (RF) unit 53.Memory 52 operationally couples with processor 51, and stores the various information being used for Operation Processor 51.RF unit operationally couples with processor 11, and launches and/or receive wireless signal.

Processor 51 can be configured to the function proposed, process and/or the method that realize describing in this manual.The layer of Radio interface protocols can be realized in processor 51.Processor 51 can realize the operation of the BS in the execution mode in Figure 11 and Figure 14.

UE 60 can comprise processor 61, memory 62 and RF unit 63.Memory 62 operationally couples with processor 61, and stores the various information being used for Operation Processor 61.RF unit 63 operationally couples with processor 61, and launches and/or receive wireless signal.

Processor 61 can be configured for the function proposed, process and/or the method that realization describes in this manual.The layer of Radio interface protocols can be realized in processor 61.Processor 51 can realize the operation of the UE in the execution mode in Figure 11 and Figure 14.

Processor 51,61 can comprise application-specific integrated circuit (ASIC) (ASIC), other chipsets, logical circuit and/or data processing equipment.Memory 52,62 can comprise read-only memory (ROM), random access memory (RAM), flash memory, memory card, storage medium and/or other memory devices.RF unit 53,63 can comprise the baseband circuit for the treatment of radiofrequency signal.When with software simulating execution mode, technology described here can utilize the module (such as, process, function etc.) performing function described here to realize.Module can be stored in memory 52,62, and can be performed by processor 51,61.Memory 52,62 can realize in processor 51,61 inside or realize in processor 51,61 outside, and in the case of the latter, memory 52,62 is coupled to processor 51,61 by correspondence via various mode as known in the art.

In view of example system described here, implementation method can be carried out according to the theme disclosed in describing with reference to multiple flow chart.But the object in order to simplify; method is shown and described as series of steps or frame, can understand and understand, and claimed theme is not limited to the order of step or frame; some step can occur in sequence according to different, or occurs with other steps drawn since then and describe simultaneously.In addition, it will be understood by those skilled in the art that the step shown in flow chart is not exclusiveness, and when not affecting spirit and scope of the present disclosure, other steps can be comprised, or the one or more steps in example flow diagram can be deleted.

More than comprise the example of various aspect.Certainly, in order to describe various aspect, assembly cannot be described or each of method may combine, but those skilled in the art will recognize that other combination and permutation a lot of are also possible.Therefore, be intended to comprise fall in the spirit and scope of claims all this type of is alternative, amendment and variant for this specification.

Claims

1. determine a method for the mobility status of the subscriber equipment in wireless communication system, the method comprises the following steps:

Perform the step of cell reselection;

Determining will by the step of the size of the community of gravity treatment;

Determine whether that the value making counter increases progressively according to the size of described community, the number of times of described counter indicating cell gravity treatment,

Wherein, if the community of gravity treatment is macrocell, then do not make the value of described counter increase progressively, and if the community of gravity treatment is Microcell, then make the value of described counter increase progressively,

Wherein, described Microcell is closed subscriber group CSG cell,

Wherein, at least one in physically based deformation cell ID PCI, cell size designator and CSG designator determines the size of described community; And

Determine the step of mobility status, this step determines described mobility status based on the number of times of cell reselection and the size of described community,

Wherein, described mobility status is the one in conventional mobility, medium mobility and high mobility, and

Wherein, describedly determine that the step of mobility status comprises:

If the number of times of the cell reselection during the mobility period is less than medium mobility threshold value, then described mobility status is defined as described conventional mobility;

If described mobility status between described medium mobility threshold value and high mobility threshold value, is then defined as described medium mobility by the number of times of the cell reselection during the described mobility period; And

If the number of times of the cell reselection during the described mobility period is greater than described high mobility threshold value, then described mobility status is defined as described high mobility.

2. method according to claim 1, further comprising the steps of: to adjust reselection time based on described mobility status.

3. method according to claim 2, wherein, determines the size of described community further based on cell size designator.

4. method according to claim 2, wherein, determines the size of described community based on CSG designator.

5., for determining a subscriber equipment for mobility status, this subscriber equipment comprises:

Radio frequency unit, it is for transmitting and receiving wireless signal; And

Processor, it is coupled to described RF unit, and this processor is used for determining described mobility status,

Wherein, described processor is configured to:

Perform cell reselection,

Determining will by the size of the community of gravity treatment,

Wherein, described Microcell is closed subscriber group CSG cell,

Described mobility status is determined based on the number of times of cell reselection and the size of described community,

Wherein, determine that described mobility status comprises:

If the number of times of the cell reselection during the mobility period is less than medium mobility threshold value, then described mobility status is defined as described conventional mobility,

If described mobility status between described medium mobility threshold value and high mobility threshold value, is then defined as described medium mobility by the number of times of the cell reselection during the described mobility period, and