WO2014021611A1 - Appareil et procédé de commande de la sélection de cellule ou de la resélection de cellule dans un système de communication sans fil - Google Patents

Appareil et procédé de commande de la sélection de cellule ou de la resélection de cellule dans un système de communication sans fil Download PDF

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Publication number
WO2014021611A1
WO2014021611A1 PCT/KR2013/006842 KR2013006842W WO2014021611A1 WO 2014021611 A1 WO2014021611 A1 WO 2014021611A1 KR 2013006842 W KR2013006842 W KR 2013006842W WO 2014021611 A1 WO2014021611 A1 WO 2014021611A1
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Prior art keywords
cell
terminal
random access
frequency band
timer
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PCT/KR2013/006842
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English (en)
Korean (ko)
Inventor
김명주
정명철
권기범
안재현
허강석
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주식회사 팬택
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/06—Reselecting a communication resource in the serving access point
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/0005—Control or signalling for completing the hand-off
    • H04W36/0055—Transmission or use of information for re-establishing the radio link
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/34—Reselection control
    • H04W36/36—Reselection control by user or terminal equipment
    • H04W36/362—Conditional handover
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W48/00—Access restriction; Network selection; Access point selection
    • H04W48/16—Discovering, processing access restriction or access information

Definitions

  • the present invention relates to wireless communications, and more particularly, to an apparatus and method for controlling cell selection or cell reselection in a wireless communication system.
  • the terminal may change the connection from the current cell to another cell or change the connection from the current base station to another base station. For example, in a situation in which a smooth service cannot be provided because load is concentrated in a cell to which the terminal is currently connected, the base station instructs the terminal to select a cell of a different frequency from the cell of the current frequency. can do.
  • the operator may receive and use one or more frequency bands, and may provide other cells belonging to each frequency band to the terminal. If a plurality of terminals are connected to a cell within a specific frequency band and provided with a service, the load concentrates on one cell at the same time. Therefore, the quality of service for the terminal cannot be maintained. In order to prevent such a problem, the base station may move a terminal connected to a cell in an overloaded frequency band to a cell in another frequency band having a relatively low load.
  • the base station may transmit an RRC connection release message for releasing the RRC connection for the terminal.
  • the RRC connection release message provides the UE with a priority of a frequency band to which the UE moves, UE-specifically or exclusively. This is called dedicated priority allocation.
  • the terminal may select a cell of a frequency band corresponding to the priority at the time of cell reselection.
  • the RRC connection release message may include a value of a specific timer. And the dedicated priority is maintained for a time corresponding to the value of a specific timer. In this case, priority information included in system information broadcasted by the base station is ignored.
  • a cell of a frequency band designated by the base station as a dedicated priority to the terminal may have a problem in transmission and reception according to the design, load state, or setting of the network. Nevertheless, the terminal cannot move to a frequency band other than the frequency band according to the dedicated priority until the specific timer expires. In other words, there is a problem in that the terminal cannot reselect a cell having a better frequency band than a cell in the current frequency band. This may cause a problem in that call setup for the terminal is delayed.
  • An object of the present invention is to provide an apparatus and method for controlling cell selection or cell reselection in a wireless communication system.
  • Another technical problem of the present invention is to provide an apparatus and method for operating a new T320 timer.
  • Another technical problem of the present invention is to provide an apparatus and a method for performing cell selection or cell reselection using redirected carrier information.
  • a terminal for controlling cell selection or cell reselection in a wireless communication system includes a receiver for receiving a radio resource control (RRC) connection release message from a base station, a dedicated priority included in the RRC connection release message, and the dedicated priority.
  • Message processing unit for obtaining a value of a timer (timer) that defines the duration of time, controlling the start, stop and expiration of the timer, if the stop condition of the timer is satisfied, stop the timer, the timer stops or
  • the terminal camps on a cell of a frequency band indicated by the dedicated priority before expiration, and a cell of a frequency band indicated by priority information included in system information after the timer is stopped or expired.
  • a cell change processor searching for a cell suitable for camping, and a random access preamble to the base station It includes a transmission unit for transmitting).
  • a method of performing cell selection or cell reselection by a terminal in a wireless communication system includes receiving an RRC connection release message from a base station, a dedicated priority included in the RRC connection release message, and a value of a timer defining a time duration for which the dedicated priority lasts. Acquiring, determining whether a stop condition of the timer is satisfied, searching for a cell suitable for camping by the terminal based on whether the stop condition of the timer is satisfied, and random access preamble on the suitable cell Transmitting to the base station.
  • the cell of the frequency band indicated by the dedicated priority is searched for the appropriate cell, and after the timer is stopped, the cell of the frequency band indicated by the priority information included in the system information is determined. Can be searched by cell.
  • a base station for controlling cell selection or cell reselection in a wireless communication system.
  • the base station generates a RRC connection release message including a parameter setting unit for setting a value of a timer defining a dedicated priority and a time duration of the dedicated priority, the dedicated priority and the value of the timer.
  • a message processor a transmitter for transmitting the RRC connection release message to a terminal, and a receiver for receiving a random access preamble on a suitable cell retrieved by the terminal.
  • the suitable cell may be searched as a cell of the frequency band indicated by the priority information included in the system information.
  • a method of controlling cell selection or cell reselection by a base station in a wireless communication system includes setting a value of a timer that defines a dedicated priority and a time duration for which the dedicated priority lasts, generating an RRC connection release message that includes the dedicated priority and the value of the timer; Sending the RRC connection release message to a terminal, and receiving a random access preamble on a suitable cell retrieved by the terminal.
  • the suitable cell may be searched as a cell of the frequency band indicated by the priority information included in the system information.
  • a method for controlling cell selection or cell reselection by a terminal in a wireless communication system is provided.
  • the method includes transmitting a random access preamble to a base station in a first cell, and if a random access response message is not received from the base station within a predetermined random access window interval, the random access preamble. Increasing the number of retransmissions by 1, checking whether a random access failure condition is satisfied in the first cell, performing a cell reselection when the random access failure condition is satisfied, And camping on a second cell of a different frequency band from the first cell by reselection of the cell.
  • the random access failure condition may be equal to the maximum allowable number + 1 of the retransmission number of the random access preamble.
  • the method may further include stopping T320, a timer that defines a time for maintaining a dedicated priority for the first cell if the random access failure condition is satisfied. .
  • the method may further comprise receiving an RRC connection release message from the base station including the dedicated priority and the value of the T320.
  • the method implicitly searches for a cell of a frequency band in which the RRC connection release message is received to the second cell when a releaseCause field included in the RRC connection release message indicates 'load balancing'. It may further include.
  • the second cell may belong to a frequency band according to a priority provided by system information.
  • the second cell may be a cell of a frequency band indicated by the dedicated priority.
  • a terminal for controlling cell selection or cell reselection in a wireless communication system If the terminal does not receive a random access response message from the base station within a transmission unit for transmitting a random access preamble (random access preamble) to the base station in the first cell, and a predetermined random access window (window) interval, Increase the number of retransmissions of the access preamble by 1, determine whether a random access failure condition is satisfied in the first cell, perform reselection of a cell when the random access failure condition is satisfied, and perform the cell selection And a cell change processor configured to camp on a second cell of a different frequency band from the first cell by reselection.
  • a random access preamble random access preamble
  • window predetermined random access window
  • the random access failure condition is that the number of retransmissions of the random access preamble is equal to the maximum allowable number of times.
  • the cell change processor may stop T320, which is a timer that defines a time for maintaining a dedicated priority for the first cell.
  • the receiver may receive an RRC connection release message including the dedicated priority and the value of the T320 from the base station.
  • the cell change processor implicitly searches the cell of the frequency band in which the RRC connection release message is received, as the second cell. can do.
  • the second cell may belong to a frequency band according to a priority provided by system information.
  • the cell change processor may search for the second cell as a cell of a frequency band indicated by the dedicated priority.
  • the UE may move to a frequency band other than the frequency band according to the dedicated priority, Since the cell may reselect a cell having a better frequency band than a cell in the current frequency band, it may solve a problem of delay of call setup for the terminal.
  • FIG. 1 shows a wireless communication system to which the present invention is applied.
  • FIG. 2 is an exemplary diagram illustrating a cell selection process of a UE in an RRC idle state according to the present invention.
  • FIG. 3 is a diagram illustrating a state change of the RRC idle state terminal to which the present invention is applied.
  • FIG. 4 is a flowchart illustrating an example in which a terminal and a base station to which the present invention is applied perform load balancing based on a dedicated priority.
  • FIG. 5 is a flowchart illustrating another example in which a terminal and a base station to which the present invention is applied perform load balancing based on a dedicated priority.
  • FIG. 6 is a flowchart illustrating another example in which a terminal and a base station to which the present invention is applied perform load balancing based on a dedicated priority.
  • FIG. 7 is a flowchart illustrating still another example in which a terminal and a base station to which the present invention is applied perform load balancing based on a dedicated priority.
  • FIG. 8 is a flowchart illustrating a cell reselection method of a terminal according to an embodiment of the present invention.
  • FIG. 9 is a flowchart illustrating a stop condition of a T320 timer according to an embodiment of the present invention.
  • FIG. 10 is a flowchart illustrating a stop condition of a T320 timer according to another example of the present invention.
  • FIG. 11 is a flowchart illustrating a stop condition of a T320 timer according to another embodiment of the present invention.
  • FIG. 12 is a flowchart illustrating a method for performing cell reselection by using a redirected carrier information (redirectedCarrierInfo) between a terminal and a base station to which the present invention is applied.
  • redirectedCarrierInfo a redirected carrier information
  • FIG. 13 is a block diagram illustrating a terminal and a base station according to an embodiment of the present invention.
  • the present specification describes a wireless communication network
  • the operation performed in the wireless communication network is performed in the process of controlling the network and transmitting data in the system (for example, the base station) that is in charge of the wireless communication network, or the corresponding wireless Work may be done at the terminal coupled to the network.
  • E-UTRAN Evolved-UMTS Terrestrial Radio Access Network
  • LTE Long Term Evolution
  • the E-UTRAN includes a base station (BS) 20 that provides a control plane and a user plane to a user equipment (UE).
  • the terminal 10 may be fixed or mobile and may be called by other terms such as a mobile station (MS), a user terminal (UT), a subscriber station (SS), a mobile terminal (MT), a wireless device (Wireless Device), and the like.
  • the base station 20 refers to a station that communicates with the terminal 10, and may be referred to as other terms such as an evolved-NodeB (eNB), a base transceiver system (BTS), and an access point.
  • eNB evolved-NodeB
  • BTS base transceiver system
  • the base stations 20 may be connected to each other through an X2 interface.
  • the base station 20 is connected to a Serving Gateway (S-GW) through an MME (Mobility Management Entity) and an S1-U through an Evolved Packet Core (EPC) 30, more specifically, an S1-MME through an S1 interface.
  • S-GW Serving Gateway
  • MME Mobility Management Entity
  • EPC Evolved Packet Core
  • S1 interface exchanges OAM (Operation and Management) information for supporting the movement of the terminal 10 by exchanging signals with the MME.
  • OAM Operaation and Management
  • EPC 30 is composed of MME, S-GW and P-GW (Packet Data Network-Gateway).
  • the MME has access information of the terminal 10 or information on the capability of the terminal 10, and this information is mainly used for mobility management of the terminal 10.
  • S-GW is a gateway having an E-UTRAN as an endpoint
  • P-GW is a gateway having a PDN as an endpoint.
  • Layers of the Radio Interface Protocol between the terminal 10 and the network are based on the lower three layers of the Open System Interconnection (OSI) reference model, which is widely known in communication systems. Layer), L2 (second layer), and L3 (third layer), among which the physical layer belonging to the first layer provides an information transfer service using a physical channel.
  • the RRC (Radio Resource Control) layer located in the third layer plays a role of controlling radio resources between the terminal 10 and the network. To this end, the RRC layer exchanges an RRC message between the terminal 10 and the base station.
  • OSI Open System Interconnection
  • a physical layer (PHY) layer provides an information transfer service to a higher layer by using a physical channel.
  • the physical layer is connected to a medium access control (MAC) layer belonging to a second layer through a transport channel.
  • MAC medium access control
  • Transport channels are classified according to how and with what characteristics data is transmitted over the air interface.
  • the physical channel is modulated by an orthogonal frequency division multiplexing (OFDM) scheme and utilizes time and frequency as radio resources.
  • OFDM orthogonal frequency division multiplexing
  • the functions of the MAC layer include mapping between logical channels and transport channels and multiplexing / demultiplexing into transport blocks provided as physical channels on transport channels of MAC service data units (SDUs) belonging to the logical channels.
  • the MAC layer provides a service to a Radio Link Control (RLC) layer through a logical channel.
  • RLC Radio Link Control
  • Functions of the RLC layer belonging to the second layer include concatenation, segmentation, and reassembly of the RLC SDUs.
  • the RLC layer In order to guarantee the various Quality of Service (QoS) required by the radio bearer (RB), the RLC layer has a transparent mode (TM), an unacknowledged mode (UM), and an acknowledged mode (Acknowledged Mode). Three modes of operation (AM).
  • AM RLC provides error correction through an automatic repeat request (ARQ).
  • PDCP Packet Data Convergence Protocol
  • Functions of the Packet Data Convergence Protocol (PDCP) layer in the user plane include delivery of user data, header compression, and ciphering.
  • the functionality of the Packet Data Convergence Protocol (PDCP) layer in the user plane includes the transfer of control plane data and encryption / integrity protection.
  • a Radio Resource Control (RRC) layer belonging to the third layer is defined only in the control plane.
  • the RRC layer is responsible for the control of logical channels, transport channels, and physical channels in connection with configuration, re-configuration, and release of radio bearers.
  • RB means a logical path provided by the first layer (PHY layer) and the second layer (MAC layer, RLC layer, PDCP layer) for data transmission between the terminal 10 and the network.
  • the establishment of the RB means a process of defining characteristics of a radio protocol layer and a channel to provide a specific service, and setting each specific parameter and operation method.
  • RB can be divided into SRB (Signaling RB) and DRB * Data RB.
  • the SRB is used as a path for transmitting RRC messages in the control plane
  • the DRB is used as a path for transmitting user data in the user plane.
  • the terminal 10 If there is an RRC connection between the RRC layer of the terminal 10 and the RRC layer of the E-UTRAN, the terminal 10 is in an RRC CONNECTED state, otherwise the RRC idle (RRC IDLE) ) State.
  • the downlink transport channel for transmitting data from the network to the terminal 10 includes a BCH (Broadcast Channel) for transmitting system information and a downlink shared channel (SCH) for transmitting user traffic or control messages. Traffic or control messages of a downlink multicast or broadcast service may be transmitted through a downlink SCH or may be transmitted through a separate downlink multicast channel (MCH).
  • the uplink transport channel for transmitting data from the terminal 10 to the network includes a random access channel (RACH) for transmitting an initial control message and an uplink shared channel (SCH) for transmitting user traffic or control messages.
  • RACH random access channel
  • SCH uplink shared channel
  • BCCH broadcast control channel
  • PCCH paging control channel
  • CCCH common control channel
  • MCCH multicast control channel
  • MTCH multicast traffic
  • the physical channel is composed of several symbols in the time domain and several sub-carriers in the frequency domain.
  • One sub-frame consists of a plurality of symbols in the time domain.
  • One subframe consists of a plurality of resource blocks, and one resource block consists of a plurality of symbols and a plurality of subcarriers.
  • each subframe may use specific subcarriers of specific symbols (eg, the first symbol) of the corresponding subframe for the physical downlink control channel (PDCCH), that is, the L1 / L2 control channel.
  • the transmission time interval (TTI) which is a unit time for transmitting data, is 1 ms corresponding to one subframe.
  • the RRC state refers to whether or not the RRC layer of the UE is in logical connection with the RRC layer of the E-UTRAN. If connected, the RRC connection state is referred to; Call. Since the UE in the RRC connected state has an RRC connection, the E-UTRAN can grasp the existence of the corresponding UE in a cell unit, and thus can effectively control the UE. On the other hand, the UE of the RRC idle state is not identified by the E-UTRAN and is managed by the core network in units of a tracking area, which is a larger area unit than the cell. That is, the presence or absence of the UE in the RRC idle state is identified only in a large area unit, and in order to receive a normal mobile communication service such as voice or data, it must move to the RRC connected state.
  • PLMN Public Land Mobile Network
  • MCCs Mobile Country Codes
  • MCSs Mobile Networks
  • IMSI International Mobile Subscriber Identity
  • GSM Global System for Mobile Communication
  • An equivalent HPLMN list refers to a PLMN code list that replaces the HPLMN code extracted from IMSI to allow the provision of multiple HPLMN codes.
  • the EHPLMN list is stored in the USIM.
  • the EHPLMN list may include HPLMN codes extracted from IMSI. If the HPLMN code extracted from IMSI is not included in the EHPLMN list, the HPLMN should be treated as Visited PLMN when selecting a PLMN. Visited PLMNs are PLMNs different from HPLMNs and EHPLMNs, if any.
  • a Registered PLMN is a PLMN from which certain LR results occur. In general, in a shared network, an RPLMN is a PLMN defined by PLMN identification of a core network operator that allows LR.
  • the UE searches for the appropriate cell of the selected PLMN and stays in the RRC idle state in the cell.
  • the UE in the RRC idle state selects a cell capable of providing possible services (cell selection) and adjusts it to the control channel of the selected cell. This process is called "camp on a cell.”
  • a terminal camped on a cell may read system information, etc. from the cell, and in most cases, may receive paging information.
  • the terminal When camping is completed, the terminal may register its presence in the registration area of the selected cell. This is called location registration (LR).
  • the terminal regularly registers its presence in the registration area or when entering a new tracking area (TA).
  • the registration area refers to any area where the terminal may roam without a location registration procedure.
  • the terminal If the terminal leaves the service area of the cell or finds a more suitable cell, the terminal reselects and camps the most suitable cell in the PLMN. If a new cell is included in another registration area, a location registration request is performed. If the terminal leaves the service area of the PLMN, a new PLMN may be automatically selected or a new PLMN may be manually selected by the user.
  • the terminal initially accesses the network through the control channel of the camped cell after initiating a call.
  • the PLMN When the PLMN receives a call for the terminal, the PLMN knows the registration area of the cell where the terminal is camped on. Therefore, the PLMN may send a paging message for the terminal through the control channel of all cells in the registration area. The terminal may receive a paging message since it is already adjusted for the control channel of the camped cell.
  • the cells camped on by the terminal in the dormant state may be classified into several types according to service types.
  • the service type defines the content of the service that the terminal proceeds in the idle state.
  • the cell type is different for each service type provided by the cell. Service types include limited service, normal service, and operator service.
  • Restricted services are mainly available in emergencies such as emergency calls, emergencyquake and tsunami warning systems (ETWS), or commercial mobile alert systems (CMAS).
  • EWS emergencyquake and tsunami warning systems
  • CMAS commercial mobile alert systems
  • a general service is a service corresponding to a public or normal call and can support a suitable cell.
  • a suitable cell is a cell when the terminal belongs to a specific PLMN.
  • the specific PLMN may be any one of a selected PLMN, a registered PLMN, and a PLMN of the Equivalent PLMN list.
  • the specific PLMN When the terminal manually or automatically selects a specific PLMN, the specific PLMN is called a selected PLMN. If the terminal belongs to the selected PLMN, the terminal selects a cell in the selected PLMN.
  • the registered PLMN is a PLMN that the network notifies the terminal through a location registration (LR) process.
  • the terminal In relation to a suitable cell, if a suitable cell is found through cell selection or cell reselection, the terminal is generally changed to a "camped normally" state. Or, if the terminal does not find a suitable cell through cell selection or cell reselection, the terminal is changed to an "any cell selection” state.
  • the "any cell selection” state is an attempt to find an allowable cell for all PLMNs corresponding to all Radio Access Technology (RAT) provided by the UE. If the UE does not find a suitable cell through cell selection or cell reselection, the UE finds an allowable cell in any PLMN other than the PLMN corresponding to any suitable cell, targeting all the supported RATs.
  • RAT Radio Access Technology
  • the operator service is a service that is allowed only to a specific terminal by the operator, it can support a reserved cell (reserved cell).
  • the UE in the RRC idle state When the UE in the RRC idle state needs to establish an RRC connection, it establishes an RRC connection with the E-UTRAN through an RRC connection procedure and transitions to the RRC connected state. There are several cases where a UE in RRC idle state needs to establish an RRC connection. For example, an upstream data transmission is necessary due to a user's call attempt, or a paging message is received from E-UTRAN. If received, a response message may be sent.
  • FIG. 2 is an exemplary diagram illustrating a cell selection process of a UE in an RRC idle state according to the present invention.
  • the terminal selects a PLMN and a radio access technology (RAT) to be serviced (S210).
  • the PLMN and the RAT may be selected by the user of the terminal or may be stored in the USIM.
  • the terminal selects a cell having the largest value among the measured base station and a cell whose signal strength or quality is greater than a specific value (S220).
  • the base station periodically receives system information.
  • a specific value is a value defined in the system to ensure the quality of a physical signal in data transmission / reception. Therefore, the value may vary depending on the RAT applied.
  • the terminal registers its information (eg, IMSI) in order to receive a service (eg, paging) from the network (S230, S240).
  • the terminal does not register in the network to which the terminal is connected every time the cell is selected. For example, if the system information of the network to be registered (for example, Tracking Area Identity (TAI)) is different from the information of the network known to the user, the network is registered in the network.
  • TAI Tracking Area Identity
  • the terminal selects another cell that provides better signal characteristics than the cell of the base station to which the terminal is connected ( S250).
  • This process is referred to as cell reselection, distinguished from initial cell selection in step S220.
  • a time constraint may be set in order to prevent the cell from being frequently reselected according to the change of the signal characteristic.
  • the terminal selects / reselects a cell of appropriate quality and performs procedures for receiving service.
  • the UE in the RRC dormant state should always select a cell of appropriate quality and prepare to receive service through this cell. For example, a terminal that has just been powered on must select a cell of appropriate quality to register with the network. When the UE in the RRC connected state enters the RRC idle state, the terminal should select a cell to stay in the RRC idle state. As such, a process of selecting a cell satisfying a certain condition in order for the terminal to enter a service standby state such as an RRC idle state is called cell selection.
  • cell selection is performed in a state in which the UE does not currently determine a cell to stay in the RRC idle state, it is most important to select the cell as soon as possible. Therefore, if the cell provides a radio signal quality of a predetermined criterion or more, even if this cell is not the cell providing the best radio signal quality to the terminal, it may be selected during the cell selection process of the terminal.
  • this process is used by the terminal when the terminal does not have prior information on the radio channel. Accordingly, the terminal searches all radio channels of the EUTRAN band only in a range where the capability of the terminal is allowed to find an appropriate cell. In each channel, the terminal finds the strongest cell. Thereafter, the terminal selects a corresponding cell if it finds a suitable cell that satisfies the cell selection criteria.
  • the second cell selection process is a cell selection process using stored information.
  • cell selection is performed by using information stored in a terminal for a wireless channel or by using information broadcast from a cell. Therefore, the cell selection may be faster than the initial cell selection process.
  • the UE selects a corresponding cell if it finds a cell that satisfies a cell selection criterion. If a suitable cell that satisfies the cell selection criteria is not found through this process, the UE performs an initial cell selection process.
  • Equation 1 The cell selection criterion used by the terminal in the cell selection process is shown in Equation 1 below.
  • Srxlev Q rxlevmeas- (Q rxlevmin + Q rxlevminoffset ) + Pcompensation.
  • Q rxlevmeas is the reception level (RSRP) of the measured cell
  • Q rxlevmin is the minimum required reception level (dBm) in the cell
  • Q rxlevminoffset is the offset for Q rxlevmin
  • Pcompensation max (P EMAX -P UMAX , 0 (dB)
  • P EMAX is the maximum transmit power (dBm) that the terminal can transmit in the cell
  • P UMAX is the maximum transmit power (dBm) of the terminal radio transmitter (RF) according to the performance of the terminal.
  • Equation 1 the UE can know that the strength and quality of the measured signal selects a cell larger than a specific value determined by the cell providing the service.
  • parameters used in Equation 1 are broadcast through system information, and the terminal receives these parameter values and uses them in cell selection criteria. At this time, there is no inter-frequency or inter-RAT priority for cell selection.
  • the terminal When the terminal selects a cell that satisfies the cell selection criteria, the terminal receives information necessary for the RRC idle state operation of the terminal in the cell from the system information of the cell. After the UE receives all the information necessary for the RRC idle state operation, the UE waits in the idle mode to request a service (eg, an originating call) or to receive a service (eg, a terminating call) from the network.
  • a service eg, an originating call
  • a service eg, a terminating call
  • the third cell selection process is a cell selection process due to leaving of the RRC connection state. This process is as follows. When the UE is changed from the RRC connected state to the dormant state, (a) if the redirectedCarrierInfo is included in the RRC connection release message, the UE selects an appropriate cell according to the redirectedCarrierInfo and attempts to camp on. . If the UE does not find a suitable cell, the UE may camp on by searching for any suitable cell according to the designated RAT.
  • the UE searches for a suitable cell in the EUTRA carrier (carrier).
  • the terminal starts a stored information cell selection to find a suitable cell and performs a cell selection process.
  • the terminal When the UE camped on any cell is changed from the RRC connected state to the RRC dormant state, (b) if the RRC connection release message includes the redirecteCarrierInfo, the terminal is in the redirectedCarrierInfo Therefore, try to camp on an acceptable cell.
  • the terminal may camp on by searching for any allowable cell according to the designated RAT.
  • the UE searches for an allowable cell in the EUTRA carrier.
  • the terminal performs a search to find an acceptable cell in any PLMN in any cell selection state.
  • the terminal After the terminal selects a cell through a cell selection process, the strength or quality of a signal between the terminal and the base station may change due to a change in mobility or a wireless environment of the terminal. Therefore, if the quality of the selected cell is degraded, the terminal may select another cell that provides better quality. When reselecting a cell in this way, a cell that generally provides better signal quality than the currently selected cell is selected. This process is called cell reselection.
  • the cell reselection process has a basic purpose in selecting a cell that generally provides the best quality to a terminal in view of the quality of a radio signal. That is, cells searched by cell reselection are cells that satisfy cell reselection criteria. If a cell of good quality is found, the terminal reselects the cell of good quality. Changing the cell may mean changing the RAT.
  • Cell reselection may be performed depending on the network, in addition to the above-described quality of the radio signal.
  • the network may determine the priority (priority) for each frequency and notify the terminal. Upon receiving this priority, the UE considers this priority prior to the radio signal quality criteria in the cell reselection process.
  • Information about absolute priority for different EUTRAN frequencies or Inter-RAT frequencies may be transmitted by system information and an RRC connection release message.
  • the system information may optionally include the priority information.
  • the RRC connection release message may include a dedicated priority.
  • the information about the absolute priority may be inherit from the other RAT when the UE reselects the inter-RAT cell. This follows the specifications specified in the existing RAT.
  • the terminal If the terminal is provided with priority through dedicated signaling, the priority provided through system information is ignored. In other words, when receiving a priority through the RRC connection release message from the base station, the terminal ignores the priority received from the system information.
  • the terminal When the terminal is camped on a cell, the terminal should apply only the priority received through the system information. Accordingly, priorities received through dedicated signaling are reserved only unless otherwise specified.
  • the terminal determines whether the terminal generally sets a band other than the currently connected frequency band as a dedicated priority while camping on. If the terminal generally sets a band other than the currently connected frequency band as a dedicated priority while camping on, the terminal regards the current frequency band as the lowest priority.
  • the dedicated priority is released in the following cases. i) When the UE enters the RRC connected state, ii) In T320, which is a timer defining a time for which the dedicated priority is maintained, when the selective validity time of T320 expires, iii) PLMN selection is NAS If performed at the request of. In addition, the dedicated priority may be released even when the UE attempts an RRC connection state.
  • the dedicated priority is maintained while the T320 timer remains activated. Therefore, while the T320 timer is maintained, the priority of the frequency band that the terminal receives through the system information is not used. That is, while the T320 timer is in progress, the UE performs cell reselection using the priority received through dedicated signaling instead of the priority received through the system information.
  • the UE performs a cell reselection evaluation process for an EUTRAN frequency band or an intra-RAT frequency band provided by system information or dedicated signaling. Meanwhile, the terminal does not perform cell reselection in a black listed cell.
  • FIG. 3 is a diagram illustrating a state change of the RRC idle state terminal to which the present invention is applied.
  • an RRC idle state terminal may be generally divided into a camped normally state, an arbitrary cell selection state, and a camped on any cell state.
  • the situation in which the terminal enters the RRC connected state includes a situation in which the terminal generally enters the RRC connected state in a camped-on state, and a situation in which the terminal enters the RRC connected state in a state in which the terminal is camped in an arbitrary cell.
  • the random cell selection again includes cell selection when leaving the connected mode, stored information cell selection, and initial cell selection.
  • the terminal selects a suitable cell when selecting each cell, the terminal is generally changed to a camped state.
  • the cell selection when the terminal exits the connected state is performed when the terminal changes from the connected state to the dormant state.
  • the terminal finds a suitable cell, the terminal is generally changed into a camped-on state.
  • no suitable cell it moves to the stored information cell selection state.
  • the UE In the case where the UE newly selects the PLMN, when the UE already knows the cell information in the PLMN, the UE moves to the stored information cell selection state. On the other hand, when the terminal does not know the cell information in the PLMN in the past, the terminal moves to the initial cell selection state. If no suitable cell is found in the stored information cell selection, the terminal eventually moves to the initial cell selection state.
  • the terminal moves to an arbitrary cell selection state. This is to allow the search of the cell to camp on any RAT that can be provided by the UE in all PLMNs because no cells that can be camped are found in the currently selected PLMN, registered PLMN, or equivalent PLMN.
  • the UE enters a camped state in an arbitrary cell.
  • a cell found in any RAT corresponds to an allowable cell. This is to allow the terminal to provide a limited service such as an emergency or disaster situation to the network.
  • the UE is authorized to use the corresponding PLMN or RAT in the random cell selection state, the state determines that the PLMN is newly selected and proceeds with the initial cell selection process. If no allowable cell is found after moving to a cell reselection process in a state of camping on an arbitrary cell, the UE moves to an arbitrary cell selection state.
  • Each procedure for cell reselection may be triggered in a generally camped-on state or a camped state in an arbitrary cell.
  • the terminal attempts to connect to a frequency band or a cell in which a load situation is sufficient, thereby preventing the concentration of load, thereby increasing the overall system efficiency.
  • This is called load balancing.
  • the base station uses the RRC connection release message to release the connection with the terminal in the RRC connection state.
  • the RRC disconnection procedure may be performed due to redirection for circuit switching-fallback in addition to load balancing.
  • FIG. 4 is a flowchart illustrating an example in which a terminal and a base station to which the present invention is applied perform load balancing based on a dedicated priority.
  • cell f1 is a cell in frequency band 1 and cell f2 is a cell in frequency band 2.
  • the UE is currently in an RRC connected state and is connected to the cell f1.
  • the base station attempts to change the terminal from the cell f1 to the cell f2 for load balancing.
  • the base station transmits an RRC connection release message to the terminal (S400).
  • the RRC connection release message is used to release all radio resources, as well as established radio bearers.
  • the RRC connection release message (RRCconnectionRelease) may include idle mode mobility control information (idleModeMobilityControlInfo) that provides dedicated priority information as shown in Table 1.
  • the idle mode mobility control information field includes a dedicatedPriorityListEUTRA field that provides dedicated priority information of EUTRA, as shown in Table 2. Dedicated priority information is determined for each mobile access network such as EUTRA, GERAN, UTRA-FDD, UTRA-TDD. It is assumed that the redirectedCarrierInfo field is not set separately.
  • the idle mode mobility control information field may include a t320 field indicating a T320 timer value.
  • the t320 field has any one of min5, min10, min20, ..., min180, and min means minute.
  • an RRC connection release message includes idle mode mobility control information (idleModeMobilityControlInfo) and a T320 timer value, and a dedicated priority indicates a cell f2.
  • DedicatedPriorityListEUTRA of EUTRA can be defined up to maxFreq and maxFreq is defined as 8. Thus, at least one and up to eight different EUTRA frequency bands may be allocated with respective dedicated priorities from 0 to 7.
  • DedicatedPriorityListEUTRA of EUTRA includes a carrierFreq field indicating a frequency band and a dedicated priority field of a frequency band according to the carrierFreq field as shown in Table 3.
  • the dedicated priority field is set to a value of any one of natural numbers 0 to 7. 0 means the lowest priority.
  • Dedicated priority may be referred to as cell reselection priority information.
  • the UE has elapsed a predetermined time (for example, 60 ms) from the earlier of a moment when the RRC connection release message is received or a time at which the lower layer indicates that the reception of the RRC connection release message has been successfully acknowledged. After that, proceed with the RRC dormant procedure.
  • a predetermined time for example, 60 ms
  • the terminal checks whether the RRC connection release message includes idle mode mobility control information (idleModeMobilityControlInfo) and a T320 timer value. In addition, the terminal stores idle mode movement control information (S405). In addition, the terminal starts the T320 timer set according to the T320 timer value (S410).
  • idle mode mobility control information IdleModeMobilityControlInfo
  • the UE performs cell selection when leaving the RRC connection state (S415).
  • the cell selection when leaving the RRC connection state redirectedCarrierInfo is not set, so a suitable cell is searched in the EUTRA frequency.
  • the terminal finds a suitable cell, the terminal camps on the cell and may enter a general camp-on state. If the terminal does not find a suitable cell, it can search for a suitable cell through the stored information cell search. If a suitable cell is not found through a stored information cell search, a suitable cell is searched through initial cell selection. At this time, the priority for frequency and the like is not considered in the cell selection process. In this embodiment, it is assumed that the terminal finds the cell f2 as a suitable cell.
  • the terminal camps on the cell f2 (S420).
  • the terminal performs cell reselection in order to find a more favorable cell in the camped state.
  • the dedicated priority is allocated to the cell f2 by the S400, and the priority received through the system information is ignored during the progress of the T320 timer in which the dedicated priority is maintained.
  • the terminal if the T320 timer is in progress in the cell f2 camped by the terminal, the terminal camps in the cell f2 because the terminal does not reselect a cell of a new frequency band. This is because, except for the cell f2, there is no frequency band designated with priority through dedicated priority assignment.
  • the terminal does not perform evaluation for cell reselection for other frequencies other than cell f2 and does not perform cell reselection. Only after the T320 timer expires can the UE perform cell reselection via information corresponding to the priority received through system information.
  • the UE performs an RRC connection establishment procedure when there is an incoming call or an outgoing call in the RRC idle state. To this end, the terminal transmits an RRC connection setup request message to the base station through the cell f2 (S425). Finally, the UE makes an RRC connection to the cell f2 rather than the cell f1 and moves from the cell f1 to the cell f2. Therefore, the load in the cell f1 can be distributed to the cell f2.
  • FIG. 5 is a flowchart illustrating another example in which a terminal and a base station to which the present invention is applied perform load balancing based on a dedicated priority.
  • cell f1 is a cell in frequency band 1 and cell f2 is a cell in frequency band 2.
  • the UE is currently in an RRC connected state and is connected to the cell f1.
  • the base station attempts to change the terminal from the cell f1 to the cell f2 for load balancing.
  • the base station transmits an RRC connection release message to the terminal (S500).
  • an RRC connection release message includes idle mode mobility control information (idleModeMobilityControlInfo) and a T320 timer value, and a dedicated priority indicates a cell f2.
  • the terminal checks whether the RRC connection release message includes idle mode mobility control information (idleModeMobilityControlInfo) and a T320 timer value. In addition, the terminal stores idle mode movement control information (S505). In addition, the terminal starts the T320 timer set according to the T320 timer value (S510).
  • idle mode mobility control information IdleModeMobilityControlInfo
  • Step S515 is the same as step S415.
  • This embodiment assumes that the terminal has searched for cell f1 as a suitable cell. Therefore, the terminal camps on the cell f1 (S520). This is a case where the cell f1 to which the UE is connected in the RRC connected state is set back to an appropriate cell in the RRC idle state.
  • the terminal performs cell reselection while camping on the cell f1 (S525).
  • the terminal generally performs cell reselection in order to find a more favorable cell in a camped state.
  • the dedicated priority is allocated to the cell f2, and before the expiration of the T320 timer in which the dedicated priority is maintained, the terminal ignores the priority received through the system information. Accordingly, the terminal maintains only the dedicated priority of the cell f2 and regards the cell f1 as the lowest priority.
  • the UE evaluates only the EUTRAN frequency band or the inter-RAT frequency band of priority given by system information or dedicated signaling for cell reselection.
  • the terminal prioritizes the cell f2 until the T320 timer expires and performs cell reselection.
  • the terminal reselects the cell f2 according to the dedicated priority. This is because, except for the cell f2, there is no frequency band designated with priority through dedicated priority assignment.
  • the terminal may reselect the cell of the frequency band corresponding to the priority received through the system information.
  • the terminal camps on the cell f2 (S530). Through cell reselection, the terminal identifies cell f2 as a suitable cell, and thus reselects cell f2 and camps on cell f2.
  • the UE performs an RRC connection establishment procedure when there is an incoming call or an outgoing call in the RRC idle state. To this end, the terminal transmits an RRC connection establishment request message to the base station through the cell f2 (S425). Finally, the UE makes an RRC connection to the cell f2 rather than the cell f1 and moves from the cell f1 to the cell f2. Therefore, the load in the cell f1 can be distributed to the cell f2.
  • FIG. 6 is a flowchart illustrating another example in which a terminal and a base station to which the present invention is applied perform load balancing based on a dedicated priority.
  • steps S600 to S620 are performed in the same manner as steps S400 to S420, respectively.
  • an incoming call or an outgoing call may occur to the terminal.
  • the base station transmits a paging message to the terminal.
  • the UE checks the incoming call for itself and proceeds with the RRC connection establishment procedure with the base station.
  • the terminal may proceed with the RRC connection establishment procedure with the base station.
  • the UE may be allocated a resource for the RRC connection establishment request message through a random access procedure.
  • the RRC connection establishment procedure when the RRC connection establishment procedure is performed, communication between the terminal and the base station may not be smooth.
  • a frequency band corresponding to cell f2 may be located at a relatively geographical edge.
  • the cell selection or cell reselection criterion for the cell f2 is satisfied at an unexpected position compared to the existing cell f1, and thus, the cell may be selected as a suitable cell.
  • Uplink transmission and reception may cause problems. This is because interference may affect other forms according to the position where the cell f2 is disposed as compared to the cell f1.
  • the terminal transmits the RRC connection establishment request message in the cell f2 allocated with the dedicated priority
  • the terminal is connected to the RRC even though the cell f2 is a suitable cell because communication in the cell f2 is not smooth. May fail (S625).
  • the UE Due to the limitation of the dedicated priority, the UE has a problem in that a state in which connection with the base station is impossible while the T320 timer is in progress is maintained.
  • the limitation of the dedicated priority refers to a phenomenon in which the UE performs cell reselection by ignoring the priority according to system information and considering only one designated priority.
  • the UE may perform cell reselection according to the priority of the E-UTRAN frequency or the interRAT frequency specified in the system information (S630). If the cell f1 is set to have a higher priority than the cell f2 in the system information of the cell f2, the terminal may reselect the cell f1 again.
  • the terminal Since the terminal reselects the cell f1, the terminal camps on the cell f1 (S635). At this time, when the paging message due to the incoming call is received from the base station, the terminal transmits an RRC connection establishment request message in the cell f1 (S640).
  • FIG. 7 is a flowchart illustrating still another example in which a terminal and a base station to which the present invention is applied perform load balancing based on a dedicated priority.
  • steps S700 to S730 are performed in the same manner as steps S500 to S530, respectively.
  • the UE transmits the RRC connection establishment request message in the cell f2 allocated with the dedicated priority, but the UE fails to connect the RRC even though the cell f2 is a suitable cell because communication in the cell f2 is not smooth. It may be (S735). Due to the limitation of the dedicated priority, the UE has a problem in that a state in which connection with the base station is impossible while the T320 timer is in progress is maintained.
  • the limitation of the dedicated priority refers to a phenomenon in which the UE performs cell reselection by ignoring the priority according to system information and considering only one designated priority.
  • the terminal may perform cell reselection according to the priority of the E-UTRAN frequency or the interRAT frequency specified in the system information (S740). If the cell f1 is set to have a higher priority than the cell f2 in the system information of the cell f2, the terminal may reselect the cell f1 again. Since the terminal reselects the cell f1, the terminal camps on the cell f1 (S745). At this time, when the paging message due to the incoming call is received from the base station, the terminal transmits an RRC connection establishment request message in the cell f1 (S750).
  • the UE when the T320 timer is in progress, the UE cannot perform cell reselection except for a cell having a designated frequency band due to limitation of dedicated priority as shown in FIGS. 6 and 7. This is true even when receiving system information indicating priority.
  • a problem occurs in a cell of a frequency band according to a dedicated priority or a load balancing is necessary, if the terminal cannot reselect a cell of another frequency band due to a T320 timer, it causes system degradation. . In particular, since the value of the T320 timer is a minimum number of minutes, a connection problem for a long time may occur.
  • the present embodiment provides a method of reselecting a cell of another frequency band by stopping the T320 timer in a certain case.
  • FIG. 8 is a flowchart illustrating a cell reselection method of a terminal according to an embodiment of the present invention.
  • the terminal receiving the RRC connection release message checks whether the RRC connection release message includes an idleModeMobilityControlInfo and a T320 timer value, stores the idle mode movement control information, and stores a T320 timer value. Start the set T320 timer (S800).
  • the idle mode movement control information provides a dedicated priority.
  • the terminal checks the stop condition of the T320 timer (S805).
  • the stop condition of the T320 timer includes a situation in which a problem occurs in the RRC connection due to the limitation of the dedicated priority. If the stop condition of the T320 timer is satisfied, the terminal stops the T320 timer even before the T320 timer expires (S810).
  • the UE may reselect a cell of another frequency band without being restricted by the dedicated priority (S815).
  • the other frequency band may be a frequency band according to the priority provided by the system information.
  • the terminal reselects a cell of a frequency band according to a dedicated priority until the T320 timer expires (S820).
  • the stop condition of the T320 timer in step S805 may be defined according to various embodiments.
  • the burn condition is a failure requirement of the random access procedure, and a problem with the random access indicates that there is a problem with the cell of the corresponding frequency band.
  • Step S805 may include, for example, the procedure of FIG. 9.
  • FIG. 9 is a flowchart illustrating a stop condition of a T320 timer according to an embodiment of the present invention.
  • N RA_TX N MAX_TX +1 and it is determined through the dedicated priority that a suitable cell cannot be searched in the designated frequency band (S905), the terminal stops the T320 timer because the stopping condition of the T320 timer is satisfied. (S810).
  • the UE transmits a random access preamble (RA preamble) to the base station again (S910) and within a predetermined random access window period. If the random access response message is not received from the base station, the number of retransmissions N RA_TX of the random access preamble is increased by 1 (S915).
  • the terminal If it is determined to be a suitable cell through cell reselection and the cell camped by the terminal is found to have a problem with the connectivity for the actual call, the terminal is currently running without waiting for the T320 timer to expire. You can stop the T320 timer. Therefore, a delay time that may occur by newly receiving system information after the time until the T320 timer is completed and reselecting a cell may be reduced.
  • step S805 may comprise, for example, the procedure of FIG. 10.
  • FIG. 10 is a flowchart illustrating a stop condition of a T320 timer according to another example of the present invention.
  • the terminal checks whether a T320 timer is in progress and checks whether an RRC connection establishment procedure is started (S1000).
  • the RRC connection establishment procedure proceeds with a series of processes for transmitting an RRC connection establishment request message starting from the UE transmitting the random access preamble to the base station.
  • An example of a scenario in which an RRC connection establishment procedure is initiated is when an UE performs an outgoing call or an incoming call by receiving a paging message from a device station while camping on a suitable cell identified through cell reselection. .
  • the terminal stops the T320 timer because the stopping condition of the T320 timer is satisfied (S810).
  • the UE may reselect a cell of another frequency band without being restricted by the dedicated priority (S815).
  • the other frequency band may be a frequency band according to the priority provided by the system information.
  • the UE which normally enters the RRC connection state through the RRC connection establishment procedure, no longer performs cell selection or cell reselection in the RRC idle state.
  • most UEs that have reselected a suitable cell will normally enter an RRC connected state through an RRC connection establishment procedure.
  • the terminal will have a problem in the RRC connection establishment procedure, at this time, the terminal failed to enter the RRC connection state Will remain in the RRC dormant state.
  • the UE which is in the RRC idle state may select a frequency band having a better state than a frequency band according to a dedicated priority through stopping of the T320 timer.
  • Step S805 may include, for example, the procedure of FIG. 11.
  • FIG. 11 is a flowchart illustrating a stop condition of a T320 timer according to another embodiment of the present invention.
  • the terminal checks whether the T320 timer is in progress and checks whether an RRC connection establishment procedure is started (S1100).
  • the RRC connection establishment procedure proceeds with a series of processes for transmitting an RRC connection establishment request message starting from the UE transmitting the random access preamble to the base station.
  • An example of a scenario in which an RRC connection establishment procedure is initiated is when an UE performs an outgoing call or an incoming call by receiving a paging message from a device station while camping on a suitable cell identified through cell reselection. .
  • the terminal determines that it is unable to search for a suitable cell in the designated frequency band through the dedicated priority (S1105), the terminal stops the T320 timer because the stop condition of the T320 timer is satisfied.
  • the UE when the UE attempts an RRC connection establishment procedure in a cell in the current frequency band, the UE enters the RRC connection state without a problem or fails to enter the RRC connection state.
  • the situation as in step S1105 is a situation where there is no more frequency band for the UE to perform cell reselection except for the frequency band according to the dedicated priority.
  • the terminal may reselect a cell of a frequency band according to the priority indicated by the system information, in addition to the frequency band to which the dedicated priority is applied.
  • the above embodiments relate to a method of reselecting a cell of another frequency band by stopping the T320 timer in a certain case.
  • another embodiment allows the terminal to reselect cells of other frequency bands by adjusting the value of the T320 timer or introducing a new timer in a reasonable line.
  • the base station may set the value of the T320 timer to keep the constraint of the dedicated priority to a minimum. That is, the base station may inform the terminal by setting the T320 timer to a minimum time shorter than 5 minutes, which is the minimum value of the existing T320 timer. When the minimum time elapses, the T320 timer expires, and thus the UE may perform cell reselection for cells in frequency bands other than the frequency bands according to dedicated priorities.
  • the minimum time may be defined as, for example, a time required for the UE to search for a suitable cell for cells in a frequency band related to all dedicated priorities.
  • the base station may operate a separate timer used to release the constraint of the dedicated priority.
  • the separate timer may be called, for example, a pseudo T320 timer.
  • the pseudo timer starts with the T320 timer, but the time is given a much smaller value than the T320 timer. Therefore, when the pseudo timer expires, the terminal may selectively reselect a cell in the frequency band according to the priority transmitted through the system information.
  • the base station may assign a value of a T320 timer or a pseudo timer to a value smaller than a general T320 value at a cell boundary. That is, the base station may adaptively set the value of the T320 timer according to the location of the terminal in the cell.
  • the priority may be a dedicated priority or may be a priority provided by system information.
  • the dedicated priority is transmitted from the base station to the terminal by dedicated signaling (RRC signaling).
  • the dedicated priority is defined only by cell f2.
  • the terminal may reselect only the cells of the single frequency band and camp on. Thereafter, even when a problem occurs in the camped cell, as long as the T320 timer is in progress, cell reselection for cells of other frequency bands in which normal service is available may be limited. That is, when the base station or the terminal uses only the frequency band of the terminal as a dedicated priority for load balancing, it may inevitably have a connection delay due to the limitation of the T320 timer.
  • the base station may set a plurality of dedicated priorities. That is, the base station may set two dedicated priorities, such as cell f2 and cell f1, or two or more dedicated priorities. In this way, if a plurality of dedicated priorities are set, the terminal may be moved to another dedicated priority cell f1 instead of the heavily loaded cell f2. Since the cell f1 corresponds to a dedicated priority, the terminal may reselect the cell f1 as a suitable cell even when the T320 timer is in operation.
  • the embodiments of Figs. 4 to 11 are dedicated to changing the operation of the T320 timer, such as stopping the T320 timer or decreasing its value.
  • the embodiments of Figs. 4 to 11 are dedicated to changing the operation of the T320 timer, such as stopping the T320 timer or decreasing its value.
  • Specifying a plurality of dedicated priorities may be controlled explicitly or implicitly.
  • the disclosure is directed to explicit dedicated prioritization.
  • the base station allows the terminal to use a plurality of dedicated priorities for cells in a movable frequency band. For example, when two dedicated priorities are defined, the base station includes a plurality of dedicated priorities in the EUTRA dedicated priority list (DedicatedPriorityListEUTRA) as shown in the table below.
  • EUTRA dedicated priority list DedicatedPriorityListEUTRA
  • the DedicatedPriorityEUTRA field has a size of 2. That is, there are two dicatedPriorityEUTRA fields.
  • the carrierFreq field of the first DedicatedPriorityEUTRA field indicates the cell f2 of the frequency band, and the dedicated priority for the cell f2 is 7. In other words, the highest priority.
  • the carrierFreq field of the second DedicatedPriorityEUTRA field indicates a cell f1 of the frequency band, and the dedicated priority of the cell f1 is 6. That is, the priority is higher after cell f2.
  • a second DedicatedPriorityEUTRA field may be used to keep the cell f1 of the currently connected frequency band as a default. If the UE intends to move to cell f2 and there is a problem such as overloading in cell f2, the UE may perform cell reselection for the cell f1 of the frequency band designated according to the second DedicatedPriorityEUTRA field. .
  • a single dedicated priority is explicitly defined.
  • the UE may implicitly recognize that there is a default priority, and may reselect a cell of a frequency band according to the default priority instead of the dedicated priority. This is possible even before the T320 timer expires. This is because the default priority can be treated as a kind of dedicated priority.
  • ETURA dedicated priority list (DedicatedPriorityListEUTRA) as shown in the following table.
  • the carrierFreq field indicates the cell f2 of the frequency band, and the dedicated priority for the cell f2 is 7.
  • the releaseCause field in the RRC connection release message as shown in Table 6 specifies the reason for the RRC connection release. If the release reason field indicates “load balancing or loadBalancingTAUrequired,” the UE indicates that the RRC connection release is performed. It can be seen that it is performed for load balancing purposes.
  • the terminal may transmit the cell of the frequency band currently connected based on the releaseCause field.
  • (f1) is specified as the default priority. That is, when the base station designates a dedicated priority in consideration of load balancing, even if the dedicated priority indicates only a cell f2 of a single frequency band, the terminal defaults the priority for the other frequency bands. To utilize. Therefore, when receiving a dedicated priority for a single frequency band, the terminal checks the current release reason and then considers the frequency band of the current cell that was used when receiving the RRC connection as the default priority.
  • the base station transmits an RRC connection release message including the reason for release to the terminal, and transmits an ETURA dedicated priority list (DedicatedPriorityListEUTRA) as shown in Table 5 to the terminal.
  • the terminal receives the ETURA dedicated priority list (DedicatedPriorityListEUTRA) as shown in Table 5, but implicitly interprets the ETURA dedicated priority list (DedicatedPriorityListEUTRA) as shown in Table 4 through the release reason.
  • the embodiments of FIGS. 4 through 11 change the operation of the T320 timer, such as stopping the T320 timer or decreasing its value.
  • the limitation of the dedicated priority is overcome by extending the dedicated priority to cells of a plurality of frequency bands.
  • the frequency is reselected by the terminal using redirected carrier information for the purpose of circuit switching fallback without using the concept of dedicated priority and T320 timer. Or you can change the cell.
  • FIG. 12 is a flowchart illustrating a method for performing cell reselection by using a redirected carrier information (redirectedCarrierInfo) between a terminal and a base station to which the present invention is applied.
  • redirectedCarrierInfo a redirected carrier information
  • cell f1 is a cell in frequency band 1
  • cell f2 is a cell in frequency band 2.
  • the UE is currently in an RRC connected state and is connected to the cell f1.
  • the base station attempts to change the terminal from the cell f1 to the cell f2 for load balancing.
  • the base station transmits an RRC connection release message to the terminal (S1100).
  • the RRC connection release message may be composed of the following syntax, for example.
  • the RRC connection release message optionally includes redirected carrier information (redirectedCarrierInfo). That is, the base station may move the terminal to the ETURA frequency or interRAT in a redirection method. In this way, the re-switching method is used not only for the purpose of circuit switched fallback, but also for the purpose of moving the terminal from the current frequency band to another frequency band for load balancing.
  • redirectedCarrierInfo redirected carrier information
  • the redirected carrier information (redirectedCarrierInfo) of the RRC connection release message may be specified as shown in Table 8.
  • Table 8 RedirectedCarrierInfo CHOICE ⁇ eutra Frequency f1 information, geran CarrierFreqsGERAN, utra-FDD ARFCN-ValueUTRA, utra-TDD ARFCN-ValueUTRA, cdma2000-HRPD CarrierFreqCDMA2000, cdma2000-1xRTT CarrierFreqCDMA2000, ..., utra-TDD-r10 CarrierFreqListUTRA-TDD-r10 ⁇
  • the eutra field indicates a cell to be reselected by the terminal for load balancing.
  • the UE may reselect cell f1 for load balancing.
  • the UE When the UE receives the RRC connection release message as described above, the UE switches to the RRC idle state and checks the retransformed carrier information (S1205). Since the reconverted carrier information indicates the cell f1, the UE may reselect the cell f1 as a suitable cell to camp on (S1210) and camp on the cell f1 (S1215).
  • the terminal may immediately camp on the cell f2. If the cell f2 is not found to be a suitable cell, the UE may camp on any designated suitable cell.
  • the terminal uses priority according to system information in cell f2. Cell reselection can be performed continuously. Therefore, when a problem occurs in the cell f2 and the cell reselection to the cell f1 is necessary, since the T320 timer is not driven, the EUTRA frequency or the interRAT frequency is according to the priority defined in the system information. Cell reselection may be performed for.
  • the terminal may transmit an RRC connection establishment request message to the base station through the cell f1 in order to switch to the RRC connected state later (S1220).
  • FIG. 13 is a block diagram illustrating a terminal and a base station according to an embodiment of the present invention.
  • the terminal 1300 includes a receiver 1305, a terminal processor 1310, and a transmitter 1315.
  • the terminal processor 1310 further includes a message processor 1311 and a cell change processor 1312.
  • the receiver 1305 receives an RRC connection release message, system information, etc. from the base station 1350.
  • the receiver 1305 transmits the received information or messages to the message processor 1311.
  • the message processor 1311 analyzes or interprets the syntax of information or messages received from the receiver 1305.
  • the message processor 1311 may analyze or interpret a message or information having a format as shown in Tables 1 to 8.
  • the message processor 1111 may analyze the syntax of the RRC connection release message to identify a frequency band corresponding to a dedicated priority.
  • the message processor 1311 may analyze the syntax of the RRC connection release message and check the value t320 of the T320 timer included in the RRC connection release message.
  • the message processor 1311 informs each layer of the terminal 1300 to perform the indication of each information or message by the terminal 1300.
  • the layer may include an RRC layer and a MAC layer.
  • Each layer that is instructed by the message processor 1311 may perform a function according to the corresponding instruction. For example, in view of the dedicated priority, when the terminal 1300 can select or reselect a cell of a specific frequency band, the message processing unit 1311 notifies the cell change processing unit 1312 and the cell change processing unit ( 1312) to perform cell selection or cell reselection for the cell.
  • the cell change processor 1312 performs cell selection or cell reselection 1312 of the terminal 1300. To this end, the cell change processor 1312 may basically perform cell selection or cell reselection as described in FIG. 2.
  • the cell change processor 1312 stores the idle mode mobility control information, and according to the T320 timer value. Start the configured T320 timer.
  • the cell change processor 1312 confirms the stop condition of the T320 timer.
  • the stop condition of the T320 timer includes a situation in which a problem occurs in the RRC connection due to the limitation of the dedicated priority. If the stop condition of the T320 timer is satisfied, the cell change processor 1312 stops the T320 timer even before the T320 timer expires.
  • the cell change processor 1312 may reselect cells of other frequency bands without being restricted by the dedicated priority.
  • the other frequency band may be a frequency band according to the priority provided by the system information.
  • the cell change processor 1312 reselects the cells of the frequency band according to the dedicated priority until the T320 timer expires.
  • the stop condition of the T320 timer may be defined according to various embodiments.
  • the cell change processor 1312 performs an operation as illustrated in FIG. 9.
  • the stopping condition of the T320 timer requires i) to be in progress in T320 and ii) to enter the RRC connected state.
  • the cell change processor 1312 performs an operation as illustrated in FIG. 10.
  • the stopping condition of the T320 timer is i) T320 is in progress, ii) the UE attempts to enter the RRC connected state, iii) the dedicated priority to search for a suitable cell in the designated frequency band It costs nothing.
  • the cell change processor 1312 performs an operation as illustrated in FIG. 11.
  • the cell change processor 1312 may check the release reason in the RRC connection release message and may implicitly recognize that there is a default priority.
  • the release reason field specifies the reason for RRC disconnection.
  • the cell change processor 1312 may determine that RRC disconnection is performed for load balancing purposes.
  • the cell change processor 1312 may reselect a cell of a frequency band according to a default priority rather than a dedicated priority. This is possible even before the T320 timer expires. This is because the default priority can be treated as a kind of dedicated priority. For example, according to a single DedicatedPriorityEUTRA field as shown in Table 5, the carrierFreq field indicates the cell f2 of the frequency band, and the dedicated priority for the cell f2 is 7.
  • the cell change processor 1312 may determine the frequency of the currently connected frequency band based on the release reason field. Note that cell f1 is designated with a default priority. In other words, the cell change processor 1312 uses the priority of the other frequency band as a default. Therefore, when the receiver 1305 receives the dedicated priority for a single frequency band, the cell change processor 1312 checks the current release reason and defaults to the frequency band of the current cell that was used when receiving the RRC connection release. Consider it a priority. That is, the cell change processor 1312 receives the ETURA dedicated priority list (DedicatedPriorityListEUTRA) as shown in Table 5, but implicitly interprets the ETURA dedicated priority list (DedicatedPriorityListEUTRA) through the release reason as shown in Table 4.
  • the cell change processing unit 1312 uses the redirected carrier information (redirectedCarrierInfo) to You can change the cell.
  • the transmitter 1315 transmits the random access preamble to the base station 1350 in order for the terminal 1300 to switch from the RRC idle state to the RRC connected state. In addition, the transmitter 1315 transmits an RRC connection establishment request message to the base station 1350 using the uplink resources allowed through the random access procedure.
  • the base station 1350 includes a transmitter 1355, a base station processor 1360, and a receiver 1365.
  • the base station processor 1360 includes a message processing unit 1362 and a parameter setting unit 1361.
  • the transmitter 1355 transmits an RRC connection release message, system information, and the like to the terminal 1100.
  • the receiver 1365 receives a random access preamble, an RRC connection establishment request message, etc. from the terminal 1300, and transfers the same to the message processor 1136.
  • the message processor 1136 analyzes or interprets the syntax of the information or the message received from the receiver 1365.
  • the message processing unit 1362 may configure or generate a message or information having a format as in any one of Tables 1 to 8.
  • the message processing unit 1362 may generate an RRC connection release message including a reason for release and an ETURA dedicated priority list (DedicatedPriorityListEUTRA) as shown in Table 5 above.
  • the parameter setting unit 1361 may set a value of the T320 timer so as to keep the constraint of the exclusive priority at a minimum, and transmit it to the message processing unit 1362. That is, the parameter setting unit 1361 may set the T320 timer to the message processing unit 1362 with a minimum time shorter than 5 minutes, which is the minimum value of the existing T320 timer. When the minimum time elapses, the T320 timer expires, and thus, the cell change processor 1312 may perform cell reselection for cells in a frequency band other than the frequency band according to the dedicated priority.
  • the minimum time may be defined as, for example, a time required for the UE to search for a suitable cell for cells in a frequency band related to all dedicated priorities.
  • the parameter setting unit 1361 may operate a separate timer used to release the restriction of the dedicated priority.
  • the separate timer may be called, for example, a pseudo T320 timer.
  • the pseudo timer starts with the T320 timer, but the time is given a much smaller value than the T320 timer. Therefore, when the pseudo timer expires, the cell change processor 1312 may reselect the cells of the frequency band according to the priority transmitted through the system information.
  • the parameter setting unit 1361 may set the value of the T320 timer or the pseudo timer at a cell boundary to a value smaller than the minimum value of the general T320. That is, the parameter setting unit 1361 may adaptively set the value of the T320 timer according to the position of the terminal in the cell.
  • the parameter setting unit 1361 may set a plurality of dedicated priorities. That is, the parameter setting unit 1361 may set two dedicated priorities, such as the cell f2 and the cell f1, or may set the two or more dedicated priorities. When the plurality of dedicated priorities are set as described above, the terminal 1300 may be moved to another dedicated priority cell f1 instead of the heavily loaded cell f2. Since the cell f1 corresponds to a dedicated priority, the cell change processor 1312 may reselect the cell f1 as an appropriate cell even when the T320 timer is in operation.

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Computer Security & Cryptography (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

La présente invention concerne un appareil et un procédé de commande de la sélection de cellule ou de la resélection de cellule dans un système de communication sans fil. Un terminal ci-décrit comprend : une unité de réception destinée à recevoir un message de libération de connexion RRC en provenance d'une station de base ; une unité de traitement de message servant à acquérir la priorité dédiée contenue dans le message de libération de connexion RRC ainsi que la valeur du compteur qui définit la durée de maintien de la priorité dédiée ; une unité de traitement de changement de cellule conçue pour commander le lancement, l'arrêt et l'expiration du compteur ; et une unité de transmission permettant de transmettre un préambule d'accès aléatoire à la station de base. Ledit terminal peut passer à une bande de fréquences différente de la bande de fréquences basée sur la priorité dédiée, et il peut resélectionner la cellule dans la bande de fréquences qui est plus adaptée que la cellule dans la bande de fréquences actuelle, même avant l'expiration du compteur permettant le maintien de la priorité dédiée, et cela résout les problèmes de retard de l'établissement de communication ou autres qui affectent le terminal.
PCT/KR2013/006842 2012-07-31 2013-07-30 Appareil et procédé de commande de la sélection de cellule ou de la resélection de cellule dans un système de communication sans fil WO2014021611A1 (fr)

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CN108924891A (zh) * 2018-08-20 2018-11-30 奇酷互联网络科技（深圳）有限公司 一种小区确定方法、用户设备和具有存储功能的装置
WO2019160343A1 (fr) * 2018-02-14 2019-08-22 Lg Electronics Inc. Procédé et appareil d'exécution d'une transmission de liaison montante avec des faisceaux pré-attribués dans un système de communication sans fil
CN111247868A (zh) * 2018-06-20 2020-06-05 谷歌有限责任公司 释放信息以改善在不同的资源控制状态下的小区选择
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CN112740760A (zh) * 2019-02-13 2021-04-30 Oppo广东移动通信有限公司 用于小区切换的方法及设备
CN114788347A (zh) * 2019-12-10 2022-07-22 三星电子株式会社 用于在无线通信***中重选小区的方法和装置
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EP3952470A1 (fr) * 2016-02-08 2022-02-09 Telefonaktiebolaget Lm Ericsson (Publ) Dispositif de communication et procédé associé, pour sélectionner une cellule et une technologie d'accès radio dans un réseau de communications sans fil
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KR101507888B1 (ko) 2014-03-05 2015-04-07 콘텔라 주식회사 이동통신 기지국 장치의 무선수락제어 실패 조건에서의 호 처리방법 및 그 기지국 장치
WO2015133684A1 (fr) * 2014-03-05 2015-09-11 콘텔라 주식회사 Procédé de traitement d'appel par un dispositif station de base de communication mobile en cas de défaillance de commande d'admission radio, et dispositif station de base correspondant
WO2016048029A3 (fr) * 2014-09-24 2016-05-19 Samsung Electronics Co., Ltd. Procédé et appareil d'attribution de priorité sur la base d'une resélection de cellules
US10064128B2 (en) 2014-09-24 2018-08-28 Samsung Electronics Co., Ltd. Method and apparatus for performing priority based cell reselection
WO2018026139A1 (fr) * 2016-08-02 2018-02-08 삼성전자 주식회사 Procédé et appareil d'exécution de radiomessagerie dans un système de communication mobile
US11382061B2 (en) 2016-08-02 2022-07-05 Samsung Electronics Co., Ltd Method and apparatus for performing paging in mobile communication system
US10271357B2 (en) 2016-09-12 2019-04-23 Lg Electronics Inc. Multiple random access preamble transmission for prioritized events
CN109644500A (zh) * 2016-09-12 2019-04-16 Lg 电子株式会社 用于单随机接入过程的多随机接入前导传输
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WO2018048182A1 (fr) * 2016-09-12 2018-03-15 Lg Electronics Inc. Transmission de préambule d'accès aléatoires multiples pour une procédure d'accès aléatoire unique
CN109644500B (zh) * 2016-09-12 2023-04-07 Lg 电子株式会社 用于单随机接入过程的多随机接入前导传输
US10791497B2 (en) 2017-03-21 2020-09-29 Samsung Electronics Co., Ltd. Method and apparatus for supporting discontinuous reception mode of connected mode in mobile communication system
WO2019160343A1 (fr) * 2018-02-14 2019-08-22 Lg Electronics Inc. Procédé et appareil d'exécution d'une transmission de liaison montante avec des faisceaux pré-attribués dans un système de communication sans fil
US11363628B2 (en) 2018-02-14 2022-06-14 Lg Electronics Inc. Method and apparatus for performing uplink transmission with pre-allocated beams in wireless communication system
US11903078B2 (en) * 2018-04-03 2024-02-13 Telefonaktiebolaget Lm Ericsson (Publ) Handling of parameters provided in release / suspend
US20220287140A1 (en) * 2018-04-03 2022-09-08 Telefonaktiebolaget Lm Ericsson (Publ) Handling of Parameters Provided in Release / Suspend
US11617209B2 (en) * 2018-04-04 2023-03-28 Kyocera Corporation Timer control in early data transmission
CN111247868A (zh) * 2018-06-20 2020-06-05 谷歌有限责任公司 释放信息以改善在不同的资源控制状态下的小区选择
CN111247868B (zh) * 2018-06-20 2023-11-10 谷歌有限责任公司 释放信息以改善在不同的资源控制状态下的小区选择
CN108924891A (zh) * 2018-08-20 2018-11-30 奇酷互联网络科技（深圳）有限公司 一种小区确定方法、用户设备和具有存储功能的装置
CN108924891B (zh) * 2018-08-20 2021-01-08 奇酷互联网络科技（深圳）有限公司 一种小区确定方法、用户设备和具有存储功能的装置
CN112740760B (zh) * 2019-02-13 2023-05-09 Oppo广东移动通信有限公司 用于小区切换的方法及设备
CN112740760A (zh) * 2019-02-13 2021-04-30 Oppo广东移动通信有限公司 用于小区切换的方法及设备
CN114788347A (zh) * 2019-12-10 2022-07-22 三星电子株式会社 用于在无线通信***中重选小区的方法和装置

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