WO2015016610A1 - 무선 통신 시스템에서 서비스 효율을 향상시키기 위한 방법 및 장치 - Google Patents
무선 통신 시스템에서 서비스 효율을 향상시키기 위한 방법 및 장치 Download PDFInfo
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- WO2015016610A1 WO2015016610A1 PCT/KR2014/007001 KR2014007001W WO2015016610A1 WO 2015016610 A1 WO2015016610 A1 WO 2015016610A1 KR 2014007001 W KR2014007001 W KR 2014007001W WO 2015016610 A1 WO2015016610 A1 WO 2015016610A1
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W36/00—Hand-off or reselection arrangements
- H04W36/08—Reselecting an access point
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04M—TELEPHONIC COMMUNICATION
- H04M15/00—Arrangements for metering, time-control or time indication ; Metering, charging or billing arrangements for voice wireline or wireless communications, e.g. VoIP
- H04M15/56—Arrangements for metering, time-control or time indication ; Metering, charging or billing arrangements for voice wireline or wireless communications, e.g. VoIP for VoIP communications
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04M—TELEPHONIC COMMUNICATION
- H04M15/00—Arrangements for metering, time-control or time indication ; Metering, charging or billing arrangements for voice wireline or wireless communications, e.g. VoIP
- H04M15/57—Arrangements for metering, time-control or time indication ; Metering, charging or billing arrangements for voice wireline or wireless communications, e.g. VoIP for integrated multimedia messaging subsystem [IMS]
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04M—TELEPHONIC COMMUNICATION
- H04M15/00—Arrangements for metering, time-control or time indication ; Metering, charging or billing arrangements for voice wireline or wireless communications, e.g. VoIP
- H04M15/66—Policy and charging system
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04M—TELEPHONIC COMMUNICATION
- H04M15/00—Arrangements for metering, time-control or time indication ; Metering, charging or billing arrangements for voice wireline or wireless communications, e.g. VoIP
- H04M15/80—Rating or billing plans; Tariff determination aspects
- H04M15/8016—Rating or billing plans; Tariff determination aspects based on quality of service [QoS]
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W4/00—Services specially adapted for wireless communication networks; Facilities therefor
- H04W4/16—Communication-related supplementary services, e.g. call-transfer or call-hold
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W4/00—Services specially adapted for wireless communication networks; Facilities therefor
- H04W4/24—Accounting or billing
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W40/00—Communication routing or communication path finding
- H04W40/24—Connectivity information management, e.g. connectivity discovery or connectivity update
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W48/00—Access restriction; Network selection; Access point selection
- H04W48/02—Access restriction performed under specific conditions
- H04W48/04—Access restriction performed under specific conditions based on user or terminal location or mobility data, e.g. moving direction, speed
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W48/00—Access restriction; Network selection; Access point selection
- H04W48/18—Selecting a network or a communication service
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W8/00—Network data management
- H04W8/02—Processing of mobility data, e.g. registration information at HLR [Home Location Register] or VLR [Visitor Location Register]; Transfer of mobility data, e.g. between HLR, VLR or external networks
Definitions
- the present specification relates to a cell selection method and apparatus in a mobile communication network, and more particularly, to continuously provide a specific service, for example, a voice service, to a terminal.
- a specific service for example, a voice service
- the present invention relates to handover control in a mobile communication network, and more particularly, to a handover method and apparatus for reducing terminal battery consumption for increasing the efficiency of measurement required for handover or transmission power control in a mobile communication system. will be.
- mobile communication systems have been developed to provide voice services while guaranteeing user activity.
- mobile communication systems are gradually expanding not only voice but also data services, and now they have developed to the extent that they can provide high-speed data services.
- a shortage of resources and users demand faster services, and thus, a more advanced mobile communication system is required.
- LTE Long Term Evolution
- 3GPP The 3rd Generation Partnership Project
- LTE is a technology that implements high-speed packet-based communication with a transmission rate of up to 100 Mbps.
- various methods are discussed.
- the network structure can be simplified to reduce the number of nodes located on the communication path, or the wireless protocols can be as close to the wireless channel as possible.
- FIG. 1 is a diagram illustrating a structure of a general LTE mobile communication system.
- a radio access network of an LTE mobile communication system includes a next-generation base station (evolved Node B, EUTRAN, hereinafter referred to as ENB or Node B) 110, a mobility management entity 120, and an SME. It is composed of GW (Serving Gateway, 30).
- the user equipment (hereinafter referred to as UE) 100 is connected to an external network through an ENB and S-GW, and a P-GW (PDN Gateway; Packet Data Network Gateway).
- P-GW Packet Data Network Gateway
- ENB (base station) 110 is a Radio Access Network (RAN) node, which is a Radio Network Controller (RNC) of a Universal Terrestrial Radio Access Network (UTRAN) system and a Base Station Conroller (BSC) of a GSM EDGE Radio Access Network (GERAN) system.
- RNC Radio Network Controller
- BSC Base Station Conroller
- GERAN GSM EDGE Radio Access Network
- the ENB 110 is connected to the UE 100 through a radio channel and plays a role similar to that of the existing RNC / BSC.
- the ENB can use multiple cells at the same time.
- the MME 120 is a device that is in charge of various control functions.
- One MME may be connected to a plurality of base stations.
- the S-GW 130 is a device for providing a data bearer, and generates or removes a data bearer under the control of the MME 120.
- An application function (AF) 140 is a device that exchanges information associated with an application at the user and application level.
- Policy Charging and Rules Function (PCRF) 150 is a device that controls a policy related to a quality of service (QoS) of a user, and corresponds to a policy and charging control (PCC) rule. Is transmitted to and applied to the P-GW 160. Policy Charging and Rules Function (PCRF) 150 is an entity that collectively controls QoS and billing for traffic.
- the term 'UP' refers to the UE 100 and RAN node 110 to which user data is transmitted and received, the S-GW 130 at the RAN node 110, and the P- at the S-GW 130. It refers to a path connecting the GW (160).
- a portion of the path using a radio channel with a severe resource limitation is a path between the UE 100 and the RAN node 110.
- a unit that can apply QoS in a wireless communication system such as LTE is an Evolved Packet System (EPS) bearer.
- EPS Evolved Packet System
- One EPS bearer is used to transmit IP flows having the same QoS requirements.
- the EPS bearer may be assigned a parameter related to QoS, which includes a QoS Class Identifier (QCI) and Allocation and Retention Priority (ARP).
- QCI QoS Class Identifier
- ARP Allocation and Retention Priority
- the QCI is a parameter that defines the QoS priority as an integer value
- the ARP is a parameter that determines whether to allow or reject the creation of a new EPS bearer.
- the EPS bearer corresponds to a Packet Data Protocol (PDP) context of a General Packet Radio Service (GPRS) system.
- PDP Packet Data Protocol
- GPRS General Packet Radio Service
- One EPS bearer belongs to a PDN connection, and the PDN connection may have an access point name (APN) as an attribute.
- APN access point name
- IMS IP Multimedia Subsystem
- VoIP Voice over LTE
- the PDN connection should be created using a well-known IMS APN.
- VoLTE Voice over LTE
- VoIP circuit switched
- measurement information is used in a communication system.
- the base station transmits measurement information and parameter information related to the measurement so that the user terminal can perform the measurement, and the parameter information may include an offset for each measurement object and a threshold used to determine the measurement report. have.
- the user terminal measures the radio parameter of the measurement target according to the configuration information, and reports the measured result to the base station when the measurement conditions are satisfied.
- the present disclosure relates to a method for maintaining a service when a certain service, for example, a voice service is allowed to be started in some network areas and not allowed in the other network areas according to a network configuration and a load control method.
- a certain service for example, a voice service is allowed to be started in some network areas and not allowed in the other network areas according to a network configuration and a load control method.
- VoLTE Voice over LTE
- TA some areas
- CS Circuit Switched
- Accurate state information is required for the user terminal to determine a cell and transmit / receive power for transmitting and receiving user data.
- the user terminal performs measurement according to the measurement setting information given by the base station, and this measurement operation occurs periodically to increase the accuracy of the measurement, and collects a large amount of calculation or information of several cells included in one measurement operation. If necessary, the battery consumption of the user terminal may be large.
- a method includes receiving information on whether a base station supports VoLTE by a base station in a mobile communication system; Checking whether neighboring base stations support VoLTE when a HO (handover) occurs; If the neighbor base station does not support VoLTE, it may include the step of initiating Single Radio Voice Call Continuity (SRVCC).
- SRVCC Single Radio Voice Call Continuity
- the method may include receiving a PS HO request message by a core network node from a base station, checking whether the core network node supports VoLTE based on a tracking area (TA) of a target base station, Notifying the base station that the PS HO fails and SRVCC is required if VoLTE is not allowed in the TA of the target base station; Based on this, it may include starting SRVCC if necessary.
- TA tracking area
- the core network node checks whether VoLTE is supported in the region to which the user terminal belongs, and if the VoLTE is not supported, setting the IMS VoPS to 0 to reply the user terminal. And sending it to the user terminal, which receives the IMS deregistration process, and the user terminal and the network changing the domain for the voice service to CS.
- the measurement parameters are pre-calculated and stored as one value. If necessary, it is characterized by including a process used without a separate calculation process if necessary.
- the user terminal when the measurement control method of the user terminal needs to measure two or more frequencies or cells according to the measurement parameters received from the base station, the user terminal load required for the measurement In order to reduce the frequency, the first frequency or cell is measured, and if the conditions are satisfied, the measurement is temporarily not performed for the first frequency or cell, but only the second frequency or cell is measured. And reporting a measurement result when the condition for the second frequency cell is satisfied.
- the mobile communication system of the present invention when a measurement control method of a user terminal needs to measure two or more frequencies or cells according to measurement parameters received from a base station, two or more frequencies or cells Only one of the measurement parameters for the selected and used, the remaining parameters are characterized in that it includes the process of ignoring.
- the measurement control method of the user terminal is received from the base station in order to reduce the unnecessary measurement process and reporting, to reduce the load on the user terminal and the network, and to increase the accuracy of the measurement. And adjusting and using the measurement parameter according to the state of the user terminal.
- a method for supporting an IMS voice of a terminal of the present invention is a method for supporting an IMS (IP multimedia subsystem) voice of a terminal in a mobile communication system.
- Receiving a message associated with a combined tracking area update (TAU) from a network node determining, by the terminal, whether the network supports IMS voice based on information included in the received message; And when the bearer associated with an evolved packet system (EPS) bearer context (EPS) persisting without supporting the IMS voice is activated, waiting for the terminal to release the bearer.
- TAU tracking area update
- EPS evolved packet system
- EPS bearer context
- the terminal of the present invention is a terminal for supporting an IMS (IP multimedia subsystem) voice in a mobile communication system, the combined tracking area update (combined TAU: tracking area) from a network node an evolved packet that determines whether a network supports an IMS voice based on the communication unit receiving a message associated with the update, and information included in the received message, and the network continues without supporting the IMS voice.
- the terminal may include a controller for controlling the terminal to wait until the bearer is released.
- a method for supporting an IMS voice of an MME of the present invention may include a method for supporting an IP multimedia subsystem (IMS) voice of a mobility management entity (MME) in a mobile communication system.
- the method may include receiving, by the MME, a message requesting a combined tracking area update (TAU) from the terminal, and in response to receiving the message, information for determining whether the network supports IMS voice.
- TAU tracking area update
- EPS Evolved Packet System
- the MME of the present invention is a combined tracking area updated from a terminal in a mobility management entity (MME) for supporting an IP multimedia subsystem (IMS) voice in a mobile communication system.
- TAU a communication unit for receiving a message requesting a tracking area update (TAU), and in response to receiving the message, a control unit for controlling to transmit a message including information for determining whether the network supports the IMS voice to the terminal; And bearer if the information is associated with the network not supporting the IMS voice and a bearer associated with a persistent Evolved Packet System (EPS) bearer context (EPS) bearer context for the terminal is activated. Is not released locally by the terminal.
- EPS Evolved Packet System
- EPS Evolved Packet System
- a method for supporting an IMS voice of a base station of the present invention is a method for supporting an IMS (IP multimedia subsystem) voice of a base station in a mobile communication system. Detecting the need for a handover (HO: handover) of the terminal, and if the target base station for the handover does not support the IMS voice, performs a PS (Packet Switched) HO with Long Term Evolution (LTE) It may include the step.
- HO Handover
- PS Packet Switched
- LTE Long Term Evolution
- the base station of the present invention is a base station for supporting an IP multimedia subsystem (IMS) voice in a mobile communication system, the communication unit for receiving information from the base station, and the received On the basis of the information, the base station detects the need for a handover (HO: Handover) of the terminal, and if the target base station for the handover does not support the IMS voice, PS (Packet) with Long Term Evolution (LTE) Switched) may include a control unit for controlling the HO to be performed.
- IMS IP multimedia subsystem
- a voice service may be provided without loss even when a region in which VoLTE is supported and a region in which VoLTE is not supported are mixed.
- the user terminal may reduce the load and battery consumption required to perform a measurement for determining handover or transmit / receive power.
- 1 is a diagram for describing a 3G / LTE service.
- FIG. 2 is a diagram illustrating a method of selecting a voice service continuity support method among PS HO and SRVCC based on a base station configuration.
- FIG. 3 is a diagram illustrating a method of selecting a voice service continuity support method among PS HO and SRVCC based on a TA of a target base station.
- FIG. 4 is a diagram illustrating an embodiment of changing a voice service domain by a terminal recognizing that IMS VoPS is not supported.
- FIG. 5 is a diagram illustrating another embodiment in which a terminal recognizing that IMS VoPS is not supported changes its voice service domain.
- FIG. 6 is a diagram illustrating an embodiment of an internal operation of a user terminal recognizing that IMS VoPS is not supported.
- FIG. 7 is a diagram illustrating a configuration of a terminal operating according to a preferred embodiment of the present specification.
- FIG. 8 is a diagram illustrating an operation flow of a user terminal according to an embodiment of the present invention.
- FIG 9 illustrates a process of performing a TAU according to an embodiment of the present invention.
- FIG. 10 is a diagram illustrating a measurement operation of a user terminal according to a measurement setting.
- FIG. 11 is a diagram illustrating a measurement operation of a user terminal according to an embodiment of the present invention.
- FIG. 12 illustrates an operation of a user terminal according to an embodiment of the present invention.
- FIG. 13 illustrates an operation of a user terminal according to an embodiment of the present invention.
- FIG. 14 illustrates an operation of a user terminal according to an embodiment of the present invention.
- 15 is a block diagram illustrating a configuration of a user terminal according to an embodiment of the present invention.
- an OFDM-based wireless communication system in particular, the 3GPP EUTRA standard will be the main target, and VoLTE will be the main target as a kind of specific service. May be applied to other communication systems and services having a similar technical background and channel form with a slight modification without departing from the scope of the present disclosure, which is determined by those skilled in the art. It will be possible.
- the technology described for VoLTE herein may be applied to other voice providing services (eg, Voice over WiFi) based on IMS without major changes.
- Some network operators of the mobile communication system may configure a network in which VoLTE is supported and a network in which VoLTE is not supported.
- whether VoLTE is supported may be different for each network configuration area.
- a small unit may be different for each cell or base station, and a larger unit is a unit for tracking area (TA) or MME pool area.
- TA tracking area
- MME MME
- the core network node, especially the MME provides the terminal with an identifier that an IMS-based voice service is available when the user terminal performs a location registration (attach or tracking area update (TAU)) process in the VoLTE support area, and conversely, no VoLTE support.
- TAU tracking area update
- VoLTE if VoLTE is not supported in a specific area, there is no interworking between the core network and the IMS network, or random access network (RAN) nodes or core network nodes may provide functions for supporting VoLTE.
- RAN random access network
- the voice service provided by VoLTE cannot be provided.
- the CS network is used without serving the voice call with VoLTE, and the VoLTE voice call activated by the user terminal in the VoLTE supported area does not support VoLTE. It means that the voice is converted to or disconnected from a CS voice call when moving to an area.
- VoLTE if VoLTE is not supported in a specific area, it may be due to call setup and load control according to the capacity of the IMS network. For example, if the capacity of the IMS network is insufficient to service the entire LTE user, to prevent the overload of the IMS network, use VoLTE for some areas (TA) and VoLTE for some other areas. You can do it.
- the core network of the network that does not actually support VoLTE is linked to the IMS, and the RAN node and the core network node may support all the functions for VoLTE.
- the continuity for the voice call is transferred to the CS network using SRVCC, Alternatively, the service may be continued using the PS and IMS networks in the VoLTE unsupported area.
- VoLTE is not supported but only allows the use of PS and IMS networks of voice calls that are already activated to provide service continuity.
- the CS call can be controlled to use the CS network instead of using the PS and IMS networks for the next voice call.
- the IMS for the user terminal is made into a deregistration state or a combined attach / TAU is performed.
- the 2G / 3G legacy network may be GERAN or UTRAN.
- the source base station has configuration information on whether or not VoLTE is supported by a base station in a peripheral region (the base station will be used as a concept including a cell) in a source base station, and when a HO (Handover) occurs, a candidate target base station If it belongs to the area supporting VoLTE, PS HO is performed. Otherwise, PS HO is not performed to the LTE base station, but SRVCC is performed through 2G / 3G networks to support continuity for voice service.
- the base station when the base station supports VoLTE, not only the base station belongs to an area supporting IMS VoPS but also supports only services continuously by handing over a VoLTE call of a terminal moved from another base station or cell (ie, In addition, the UE may generate a new outgoing VoLTE call or receive a new incoming VoLTE call in an area managed by the BS.
- FIG. 2 is a diagram illustrating a method of selecting a voice service continuity support method among PS HO and SRVCC based on a base station configuration.
- the source base station has information on neighboring base stations. It may receive information on neighboring base stations provided by an Operation and Maintenance (O & M) server, or may use information collected using a user terminal. Alternatively, the information can be set manually. Alternatively, the information may be transmitted to the base station through a handover restriction list for the user terminal.
- the O & M server provides the base station with information such as base station / cell ID, VoLTE support, and SRVCC support.
- the base station may instruct the user terminal to collect and report information of neighboring base stations, and in response, the user terminal may provide information such as base station / cell ID, VoLTE support, and additional SRVCC support.
- the user terminal with the activated VoLTE call performs a measurement and transmits a measurement report to the base station.
- the base station determines that the user terminal has an active VoLTE call (ie, has an active state with a bearer with QCI 1 or 5) and there is an LTE base station that does not support VoLTE around, You can also set up measurements for 2G / 3G cells.
- mobility support HO
- SRVCC is performed to transfer a voice call to a 2G / 3G cell.
- the base station may additionally set the measurement to the user terminal to find a suitable 2G / 3G cell, and receive a response. If the measurement process for the 2G / 3G cell has already been performed in the above process, this process may be omitted.
- the base station when the base station supports VoLTE, not only the base station belongs to an area supporting IMS VoPS but also supports only services continuously by handing over a VoLTE call of a terminal moved from another base station or cell (ie, In addition, the UE may generate a new outgoing VoLTE call or receive a new incoming VoLTE call in an area managed by the BS.
- the base station triggers the PS HO, the MME first determines that the user terminal is activated VoLTE Check whether the UE has a call based on the presence or absence of the QCI 1 or 5 bearer or the use of the IMS APN, and also checks whether the target base station supports the VoLTE.
- a bearer having a QCI of 1 may be referred to as a bearer associated with a persistent EPS bearer context.
- the VoLTE call refers to a call using QoS of teleservice 11.
- the MME notifies the HO with a message indicating that the request was not accepted, including an identifier indicating that the target base station does not support VoLTE or an identifier indicating that SRVCC is needed, and receiving the source base station. Performs SRVCC.
- the base station supports VoLTE, not only the base station belongs to an area supporting IMS VoPS but also supports only services continuously by handing over a VoLTE call of a terminal moved from another base station or cell (ie, In addition, the UE may generate a new outgoing VoLTE call or receive a new incoming VoLTE call in an area managed by the BS.
- FIG. 3 is a diagram illustrating a method in which an MME selects a voice service continuity supporting method among PS HO and SRVCC based on a TA of a target base station;
- a base station that receives a measurement report transmitted by a user terminal having an activated VoLTE call recognizes that a HO is necessary and transmits a handover required message to the MME together with an ID of the target base station. .
- the MME first checks whether the user terminal is using VoLTE. If a bearer with a QCI of 1 or 5 is active and / or using a PDN connection to the IMS APN, it may be determined whether VoLTE is in use.
- the MME determines whether the target base station (or region) supports VoLTE based on the ID of the target base station or the ID (eg, TAI) of the region to which the target base station / cell belongs. Check it. This may be based on a table indicating whether the MME supports VoLTE by base station / cell ID or TAI, and such a table may be set manually or by informing the base station whether its VoLTE is supported during the process of creating a connection with the MME. It may be set or may be set through a separate question / answer process. Alternatively, the information may be delivered to the MME through a handover restriction list for the user terminal.
- the MME accepts and proceeds with the PSHO procedure, otherwise it informs the source base station that the PS HO cannot be made.
- an S1 Handover Preparation Failure message may be used, which will contain information indicating that the HO failure reason indicates that the PS HO for the VoLTE call cannot be supported, or that SRVCC is required. Can be.
- the source base station that receives this may recognize that SRVCC is needed instead of PS HO, and may start the SRVCC process.
- the MME informs the source base station that the SRVCC request cannot be accepted.
- an S1 Handover Preparation Failure message may be used, and this message may include information indicating that the cause of the HO failure is a PS HO for the VoLTE call.
- the source base station which has received this may PS HO the user terminal to the neighbor neighbor LTE cell instead of SRVCC.
- the base station when the base station supports VoLTE, not only the base station belongs to an area supporting IMS VoPS but also supports only services continuously by handing over a VoLTE call of a terminal moved from another base station or cell (ie, In addition, the UE may generate a new outgoing VoLTE call or receive a new incoming VoLTE call in an area managed by the BS.
- the user terminal may call to maintain the IMS VoPS call currently in progress. You may not perform actions that may affect persistence. More specifically, the user terminal is in an ECM-CONNECTED state to maintain an ongoing IMS VoPS call, and ESM signaling associated with the IMS VoPS call (eg, PDN connection or EPS associated with the IMS VoPS call). request to further activate, deactivate, or modify the bearer).
- ESM signaling associated with the IMS VoPS call eg, PDN connection or EPS associated with the IMS VoPS call.
- the source base station performs a PS HO process. If the VoLTE support is divided into a TA (or a set of TAs), a tracking area update (TAU) process is performed when the user terminal is HOed to a base station configured not to use VoLTE. At this time, the MME may know that the user terminal has moved to a base station / area configured not to use VoLTE and inform the user terminal that IMS VoPS (used in the same sense as IMS Voice over PS, VoLTE / VoIMS) is not supported. .
- IMS VoPS used in the same sense as IMS Voice over PS, VoLTE / VoIMS
- the domain of the voice service for the user terminal is changed from PS to CS, and outgoing and incoming voice calls are serviced through the CS.
- This operation i.e., maintaining VoLTE for a call that is already in progress, then changing the domain to CS at the end of the call
- the user terminal has an IMS VoPS call currently in progress and moves to an area that is not supported by IMS VoPS, and the user terminal recognizes this, in order to maintain the current IMS VoPS call, You may not perform actions that may affect the duration of the call.
- the user terminal is in an ECM-CONNECTED state to maintain an ongoing IMS VoPS call, and ESM signaling associated with the IMS VoPS call (eg, PDN connection or EPS associated with the IMS VoPS call). request to further activate, deactivate, or modify the bearer).
- the user terminal may apply the operation only to a specific PLMN.
- the terminal may apply the operation only to the HPLMN (home operator) or may selectively apply the operation based on the predetermined information on whether to apply the operation for each PLMN.
- FIG. 4 is a diagram illustrating an embodiment of changing a voice service domain by a terminal recognizing that IMS VoPS is not supported.
- the source base station when a user terminal having a VoLTE call moves and needs a HO, the source base station performs a PS HO process. If the cell to which the user terminal moves belongs to a base station configured not to use VoLTE, an already activated voice call is moved through a PS HO process, but a newly generated voice call may not use IMS VoPS. According to the embodiment of the present specification described above, an area allowed / disallowed to use VoLTE is configured in units of TAs (or sets of TAs), and the situation of this embodiment, that is, a user with an active VoLTE call uses VoLTE. In case of HO to a base station which is not allowed to do so, a TAU procedure should be performed.
- the base station When the user terminal sends a normal TAU request in a Radio Resource Control (RRC) message to the base station, the base station sends the message to the MME in S1 and sends the message to the MME. You can send TAI together.
- the MME may receive and store a TAI (Tracking Area Identity) to which the target base station belongs from the source base station. The MME may know the TA to which the user terminal belongs based on this information, and may determine whether the base stations of the TA are configured to use VoLTE. If it does not support VoLTE, the MME sets the IMS VoPS field in EPS network feature support information of the TAU accept message sent to the user terminal to 0 (ie, not supported). Set to.
- RRC Radio Resource Control
- the user terminal receiving this can know that VoLTE is not supported in the current staying area. Even if the user terminal receives a message set to not support IMS VoPS from the MME, if there is a currently active VoLTE call, the user terminal does not immediately change the domain for the voice service to CS. In addition, if the user terminal has an IMS VoPS call currently in progress and moves to an area where IMS VoPS is not supported, and the user terminal recognizes this, in order to maintain the current IMS VoPS call, You may not perform actions that may affect the duration of the call.
- the user terminal is in an ECM-CONNECTED state to maintain an ongoing IMS VoPS call, and ESM signaling associated with the IMS VoPS call (eg, PDN connection or EPS associated with the IMS VoPS call). request to further activate, deactivate, or modify the bearer).
- the user terminal since the user terminal needs to use the CS domain for voice service, it sends a combined TAU request to the MME for registration for CSFB.
- the MME sets the type of the TAU accept message to be combined and delivers it to the terminal, indicating that the CSFB can be used in the future, and voices the user terminal. Change the domain to CS, and perform the location registration process of the terminal for the CS service with the Mobile Switching Center (MSC).
- MSC Mobile Switching Center
- EPS update information IE EPS update information IE
- the UE may recognize that the CSFB should be used for voice service in the future If the UE transmits a combined TAU request to the MME for use of the CSFB and the network does not support the CSFB, the MME allows the TAU.
- the EPS update result information element (EPS update result IE) of the message can be set to TA updated (send) and sent, and the user terminal receiving the message can not know that the CSFB is not available. You can disable the UTRAN function and then use the 2G / 3G network.
- the operation of the user terminal receiving the EPS update result IE of the TAU permission message, turning off the E-UTRAN and using the 2G / 3G (GERAN / UTRAN) network depends on the number of times the TAU has been issued. Can be controlled.
- the terminal increases the number of trials by 1 each time the TAU request is performed, and transmits the operation, that is, the combined type TAU request, but the EPS update result is performed as EPS only, and the number of trials is a specific value (for example, the E-UTRAN function may be turned off, the GERAN / UTRAN network may be selected, and the operation of using the selected network (GMM or MM operation) may be performed only when it is equal to or larger than 5).
- the E-UTRAN function may be turned off, the GERAN / UTRAN network may be selected, and the operation of using the selected network (GMM or MM operation) may be performed only when it is equal to or larger than 5).
- the user terminal may transmit a combined TAU request by setting, instead of the normal TAU request (normal TAU requst) instead of the combined TAU. ) Can be sent. This is to prevent a new CS received call request from occurring due to the location update of the CS domain of the user terminal. More specifically, if there is an IMS VoPS session in which the user terminal is in progress and the merged TAU is performed and the voice domain for the user terminal is changed to CS, when a CS hand signal is generated, a single voice call (IMS) is present.
- IMS single voice call
- Paging for CS calls may occur even though VoPS is in progress, even if a merge TAU is required depending on the settings to prevent this, IMS VoPS If a call needs to be maintained, a normal type TAU may be performed first, and after the IMS VoPS call is terminated, the merge TAU may be performed again.
- the user terminal may call the CSFB.
- the emergency call must be initiated before knowing whether it is supported, so you can immediately turn off the E-UTRAN function and move to the 2G / 3G network to perform the emergency call process.
- the user terminal may use the merge type attach / TAU (TAU) instead of the normal type attach / TAU (TAU). It can also be done. Usually this is for the case that voice service is provided through IMS VoPS, but SMS is provided through CS network. In this case, the user terminal can always use CSFB, but since VoLTE is supported, the user terminal is in a state of using VoLTE. In this case, performing the TAU process twice in the previous embodiment can be shortened.
- TAU merge type attach / TAU
- TAU normal type attach / TAU
- FIG. 5 is a diagram illustrating another embodiment in which a terminal recognizing that IMS VoPS is not supported changes its voice service domain.
- the source base station performs a PS HO process. If the cell to which the user terminal moves belongs to a base station configured not to use VoLTE, the voice call that is already activated is moved through the PS HO process, but the newly generated voice call may not use IMS VoPS.
- an area allowed / disallowed to use VoLTE is configured in units of TAs (or sets of TAs), and the situation of this embodiment, that is, a user with an active VoLTE call uses VoLTE. In case of HO to a base station which is not allowed to do so, a TAU procedure should be performed.
- the base station When the user terminal sends a combined TAU request in an RRC message to the base station, the base station sends the combined TAU request to the MME in an S1 message and sends the ID of the TA to which the cell in which the user terminal stays, that is, the TAI. Can be.
- the MME may receive and store the TAI to which the target base station belongs from the source base station. The MME may know the TA to which the user terminal belongs based on this information, and may determine whether the base stations of the TA are configured to use VoLTE. If it does not support VoLTE, the MME sets the IMS VoPS field in EPS network feature support information of the TAU accept message sent to the user terminal to 0 (ie, not supported).
- the MME sets the EPS update result information element (EPS update result IE) to merged TA / LA updated. To pass.
- EPS update result IE EPS update result information element
- the user terminal receiving this can know that VoLTE is not supported in the current staying area. Even if a user terminal receives a message configured as IMS VoPS not supported from the MME, if there is a currently active VoLTE call, the user terminal does not immediately change the domain for the voice service to CS. Also, if the user terminal moves to an area where IMS VoPS is not supported when the user terminal has an ongoing IMS VoPS call, and the user terminal recognizes this, the user terminal may call the call to maintain the ongoing IMS VoPS call.
- IMS VoPS EPS update result information element
- the user terminal is in an ECM-CONNECTED state to maintain an ongoing IMS VoPS call, and ESM signaling (eg, PDN connection or EPS associated with IMS VoPS call) associated with the IMS VoPS call. request to further activate, deactivate, or modify the bearer).
- ESM signaling eg, PDN connection or EPS associated with IMS VoPS call
- the user terminal waits until the currently activated voice call ends, and when the voice call ends, the user terminal performs an IMS deregistration process to explicitly notify the network that IMS is no longer used. have.
- the user terminal can recognize that the CSFB should be used for voice service in the future.
- the MME sends an EPS update result IE (EPS update result IE) of the TAU accept message. It can be seen that the user terminal, which has been configured to send TA updated (updated) and receives it, cannot use the CSFB. In this case, the user terminal may operate to use the 2G / 3G network after turning off the E-UTRAN function.
- the operation of the user terminal receiving the EPS update result IE of the TAU permission message, turning off the E-UTRAN and using the 2G / 3G (GERAN / UTRAN) network depends on the number of times the TAU has been issued. Can be controlled.
- the terminal increases the number of trials by 1 each time the TAU request is performed, and transmits the operation, that is, the combined type TAU request, but the EPS update result is performed as EPS only, and the number of trials is a specific value (for example, the E-UTRAN function may be turned off, the GERAN / UTRAN network may be selected, and the operation of using the selected network (GMM or MM operation) may be performed only when it is equal to or larger than 5).
- the E-UTRAN function may be turned off, the GERAN / UTRAN network may be selected, and the operation of using the selected network (GMM or MM operation) may be performed only when it is equal to or larger than 5).
- the user terminal receives a response to the TAU request after the PS HO, and a new emergency call may occur before the VoLTE call ends.
- the bearer for the VoLTE call can be selectively deactivated locally, and the CSFB request process for the emergency call can be immediately performed.
- the E-UTRAN function can be immediately turned off and moved to the 2G / 3G network to perform the emergency call process.
- FIG. 6 is a diagram illustrating an embodiment of an internal operation of a user terminal recognizing that IMS VoPS is not supported.
- FIG. 6 is a diagram illustrating interworking between a 3GPP modem layer in charge of a function related to a 3GPP access network and an IMS / connection manager layer in charge of IMS and overall communication functions within a user terminal.
- RIL Radio Interface Layer
- the interworking between the IMS / connection management layer and the 3GPP modem layer is described as a request / command and an operation thereof. However, this is only an embodiment. Receiving that VoPS is not supported, and based on this, changing the domain of the IMS deregistration process and subsequent voice service to CS (or CSFB) can be applied to operations with slight variations. .
- FIG. 7 is a diagram illustrating a configuration of a terminal operating according to a preferred embodiment of the present specification.
- a terminal may include a wireless transceiver, a controller, and a storage.
- the wireless transceiver receives IMS VoPS support information from the network and transmits and receives a registration related message under the control of the controller.
- the controller determines whether to perform an IMS deregistration process or changes a domain for a voice service according to the embodiments described above.
- the storage unit may store various pieces of information necessary for the operation of the terminal according to the exemplary embodiment of the present specification. For example, whether or not IMS VoPS is supported for each TA may be stored.
- the wireless transceiver of FIG. 7 may correspond to the 3GPP modem layer of FIG. 6, and the controller of FIG. 7 may correspond to the IMS / connection management layer of FIG. 6.
- FIG. 8 is a diagram illustrating an operation flow of a user terminal according to an embodiment of the present invention.
- a user terminal having an ongoing VoLTE call transmits a TAU request message to the MME (S800).
- the MME can determine whether VoLTE (IMS VoPS) is supported in the region where the user is located, based on the TAI received from the base station. If VoLTE is not allowed in the area, the MME sets the IMS VoPS field of EPS network feature support information of the TAU accept message to the user terminal to 0 (ie, not supported). By setting or not including the information in the TAU accept message, it is possible to indicate whether VoLTE is not supported.
- IMS VoPS VoLTE
- the user terminal checks whether there is an ongoing VoLTE call (S810). Confirming that a VoLTE call is in progress can be done either by explicitly using information received from another layer, or by checking that the QCI 1/5 bearer is active.
- the user terminal waits until the VoLTE call ends (S820), and when the VoLTE call ends (S830), checks whether the updated state of the result of the received TAU is combined TA / LA updated (S840). ). If the user terminal moves to an area where IMS VoPS is not supported when the user terminal has an ongoing IMS VoPS call, and the user terminal recognizes the current IMS VoPS call, the user terminal may continue to maintain the ongoing IMS VoPS call. You may not perform actions that may affect you.
- the user terminal is in an ECM-CONNECTED state to maintain an ongoing IMS VoPS call, and ESM signaling associated with the IMS VoPS call (eg, PDN connection or EPS associated with the IMS VoPS call). request to further activate, deactivate, or modify the bearer).
- ESM signaling associated with the IMS VoPS call eg, PDN connection or EPS associated with the IMS VoPS call.
- the user terminal may perform IMS deregistration and change the voice domain to CS (S860).
- Changing the voice domain to CS means that the voice call is set up through the CS network when a voice outgoing call is made in the future (using CSFB), and the voice call is set up through the CS network when the outgoing voice call is made (using CSFB). Means.
- the user terminal performs the combined TAU process again (S850) and receives the combined TA / LA updated acceptance through the acceptance message.
- the user terminal may perform IMS deregistration and change the voice domain to CS.
- the user terminal may directly request the transmission of a TAU message to the NAS layer or may intentionally satisfy one or more of conditions causing the TAU. For example, the user terminal may change one or more of a usage setting, voice domain preference, or DRX cycle (discontinuous reception cycle) to induce a TAU. In this way, the parameters changed to cause the TAU may be applied only temporarily, and may be reset to the original values during the next TAU process.
- a usage setting e.g., voice domain preference
- DRX cycle discontinuous reception cycle
- the user terminal may check which PLMN the user is currently receiving. That is, when the VoLTE call is in progress and the IMS VoPS is not supported, the user terminal waits until the voice call is terminated and performs the combined TAU if necessary, performs the IMS deregistration, and changes the voice domain to CS.
- the present invention may be applied only to a specific preset PLMN. To this end, the user terminal may compare the currently selected PLMN with a pre-stored PLMN or not, and may execute the operation only when allowed.
- FIG 9 illustrates a process of performing a TAU according to an embodiment of the present invention.
- the user terminal recognizes a TAC of a new cell (S900). Before step S900, the user terminal may have an IMS VoPS call currently in progress.
- the user terminal When the TAC of the new cell is recognized, the user terminal first determines whether there is an ongoing IMS VoPS session and whether the TAU is necessary (S910).
- the user terminal If there is a current IMS VoPS session and a TAU is required, the user terminal performs a TAU (S920).
- the user terminal checks whether the TAU accept message received from the MME indicates that VoIMS is not supported in the current region (S930). If the TAU accept message received from the MME indicates that VoIMS is not supported in the current region, the user terminal maintains the current IMS VoPS session as it is (S940) and waits until the IMS VoPS session is terminated (S950). ). If the user terminal moves to an area where IMS VoPS is not supported when the user terminal has an ongoing IMS VoPS call, and the user terminal recognizes the current IMS VoPS call, the user terminal may continue to maintain the ongoing IMS VoPS call. You may not perform actions that may affect you.
- the user terminal is in an ECM-CONNECTED state to maintain an ongoing IMS VoPS call, and ESM signaling associated with the IMS VoPS call (eg, PDN connection or EPS associated with the IMS VoPS call). request to further activate, deactivate, or modify the bearer).
- ESM signaling associated with the IMS VoPS call eg, PDN connection or EPS associated with the IMS VoPS call.
- the user terminal can again check that a TAU (pending) is still needed and perform a combined TAU.
- inducing a TAU may be performed by using an API for requesting a TAU to be performed by the NAS layer, or by satisfying one or more of the conditions causing the TAU.
- the user terminal may change one or more of a usage setting, a voice domain preference, or a DRX cycle to induce a TAU.
- the parameters changed to cause the TAU may be applied only temporarily, and may be reset to the original values during the next TAU process.
- the user terminal may additionally perform an IMS de-registration process to invalidate IMS registration.
- the user terminal triggers a combined TA / LA update (S960).
- the triggering of the merge TA / LA update may be performed by using an API for requesting a TAU to the NAS layer or by satisfying one or more of the conditions causing the merge TA / LA update.
- the user terminal may change one or more of a usage setting, a voice domain preference, or a DRX cycle to cause a merge TA / LA update.
- the user terminal performs a combined type TAU (S970).
- the changed parameters to cause the merge TA / LA update can be applied only temporarily, and can be reset to the original values during the next TAU process.
- the user terminal may additionally perform an IMS de-registration process to invalidate IMS registration.
- all steps may optionally be subject to performance or to be omitted.
- the steps do not necessarily have to occur in order and may be reversed.
- the TAU process may be applied in place of the attach or routing area update (RAU) process.
- RAU routing area update
- the combined TAU, the combined type TAU, and the combined TA / LA update are used in the same meaning.
- the LTE network may be used in the same sense as the E-UTRAN, and the CS network may be UTRAN, GERAN, CDMA2000, or a similar network capable of supporting CS services, collectively referred to as a legacy network.
- being in one network may cover both cases of being connected to one network or camping in an idle state.
- the term base station corresponds to the eNB in the case of the E-UTRAN.
- an object to be measured by the user terminal is a cell, and one cell operates at a specific frequency, but there may be several cells sharing one frequency.
- the base station may set the measurement (measurement) to determine the handover or transmission power of the user terminal.
- the base station may transmit measurement configuration information related to measurement to the user terminal, and the information may include a measurement object and a parameter (correction value, threshold value, etc.) used for the measurement.
- the user terminal receiving the measurement setting periodically performs the measurement, and if it is necessary to report the measurement result by the measured result, and reports the measurement result to the base station.
- FIG. 10 is a diagram illustrating a measurement operation of a user terminal according to a measurement setting.
- the user terminal receives measurement setting information from the base station (S1000).
- the measurement setting information may include one or more measurement targets (frequency / cell), one or more reporting conditions (thresholds), and one or more offsets.
- the correction value may include a frequency-specific correction value for correcting a measurement result according to transmission characteristics by frequency, a cell-specific correction value for correcting the measurement results according to transmission characteristics by cells, and a hysteresis parameter.
- the user terminal performs measurement according to the set information (S1010). That is, the user terminal measures a radio condition (radio condition or radio parameter) of the measurement target, and the radio wave state may be RSRP (Reference Signal Received Power) or RSRQ (Reference Signal Received Quality).
- RSRP Reference Signal Received Power
- RSRQ Reference Signal Received Quality
- the user terminal corrects the measured propagation state by using the correction value included in the measurement setting, and compares it with a reporting condition (threshold value), and reports the measurement result to the base station (S1020).
- the radio wave state of the measurement target can be measured and corrected according to the measurement setting, and the result can be reported.
- the calculation result of the user terminal is large because the measurement result must be corrected every time the measurement is performed. This can drain the battery.
- the threshold value to which the correction value is applied in advance is calculated and stored for each frequency or cell, and then stored in the actual measurement target. It is characterized in that the calculation complexity of the user terminal is lowered by using only the calculated threshold value without performing correction when determining whether to make a measurement and report determination.
- FIG. 11 is a diagram illustrating a measurement operation of a user terminal according to an embodiment of the present invention.
- the user terminal receives measurement setting information from the base station (S1100).
- the measurement setting information may include one or more measurement targets (frequency / cell), one or more reporting conditions (thresholds), and one or more offsets.
- the correction value may include a frequency-specific correction value for correcting a measurement result according to transmission characteristics by frequency, a cell-specific correction value for correcting the measurement results according to transmission characteristics by cells, and a hysteresis parameter.
- the user terminal performs a process of applying the correction value to the reporting condition (eg, the threshold value) and stores the calculated reporting condition. (S1110). More specifically, if the reporting condition is defined as a threshold, the measurement setting includes the correction value V_f for the specific frequency f, the correction value V_c for the specific cell c, and the threshold value T used for the measurement. Assuming that the user terminal receives the measurement information,
- T (f, c) T-V_f-V_c
- a threshold value is calculated and stored for each frequency and cell, and the stored threshold value is used in a subsequent measurement process. If some correction values are not included in the measurement setting, the correction values may be omitted in the threshold calculation process. In addition, if the hysteresis is included in the measurement setting, the hysteresis may also be reflected in the threshold calculation in advance.
- T (f, c) T-V_f-V_c-Hysteresis
- the user terminal measures the radio wave state with respect to the measurement target (S1120), finds and compares the previously calculated and stored threshold values according to the frequency and cell information of the measurement target (for example, the measurement target is the frequency f
- the measurement target is the frequency f
- T (f, c) of the stored values is used
- the measurement result is reported to the base station (S1130).
- the correction value is not used in this process.
- the threshold value is not used in the reporting condition and only the history value is used, the result of applying the correction value to the history value is calculated and stored in advance, and when the measurement occurs later, only the stored history value together with the measured value It can also be used to report the measurement results.
- the user terminal should measure the two or more measurement targets according to the measurement configuration. In this case, since the user terminal needs to measure two or more cells, inefficiency due to the measurement, for example, power consumption may increase.
- a method for reducing inefficiency that may occur when determining whether to report a measurement result based on the measurement results of the two or more cells is provided.
- the user terminal first selects one of the measurement targets according to the measurement setting, and replaces the threshold value for the selected measurement target with a threshold value for the condition for starting the measurement for the second measurement target instead of the threshold value for the measurement result report. do. That is, the user terminal performs measurement only on the selected first measurement target, and if the measurement result satisfies the condition according to the threshold value, the user terminal does not perform measurement on the first measurement target for a predetermined time and the remaining measurement targets, that is, two Only the measurement for the first measurement object is performed.
- the user terminal determines that the measurement result report is necessary. After the set period of time, the user terminal performs measurement only on the first measurement target selected again. That is, by changing the situation in which the measurement result report should be determined based on the measurement results of two or more measurement objects to measure only one measurement object at one measurement time point, the computational complexity and power consumption of the user terminal are reduced.
- FIG. 12 illustrates an operation of a user terminal according to an embodiment of the present invention.
- the user terminal receives measurement setting information from the base station (S1200).
- the measurement setting information may include one or more measurement targets (frequency / cell), one or more reporting conditions (thresholds), and one or more offsets.
- the correction value may include a frequency-specific correction value for correcting a measurement result according to transmission characteristics by frequency, a cell-specific correction value for correcting the measurement results according to transmission characteristics by cells, and a hysteresis parameter.
- the measurement report setting is to be made based on the measurement result of two or more cells (for example, if the RSRP of the cell to which the user terminal accesses is less than or equal to T1 and the RSRP of the neighboring cell is greater than or equal to T2, the measurement result reporting starts. ), The user terminal does not perform all the measurements for the various measurement targets.
- the embodiment of the present invention will now be described only in the case of using measurement results for two cells, but the main point of the present embodiment can be applied to the case where the measurement result of two or more cells should be used without major change. .
- the user terminal When the user terminal receives the measurement setting, instead of performing the measurement on the two measurement objects, the user terminal first selects one measurement object to measure, and the threshold value for the selected measurement object determines whether to report the measurement result. Instead, it is used to determine whether to start the timer.
- the first selection of any one of the two measurement targets may use a priority set in advance in the user terminal, use information included in the measurement setting, or randomly select.
- the user terminal may measure the primary cell or serving cell prior to the state of the neighboring cell. The user terminal continuously performs only the measurement on the first measurement target, and if the propagation state of the selected first cell satisfies the threshold value, the user terminal starts a timer (S1210).
- the user terminal While this timer is in progress, the user terminal no longer measures the propagation state of the first measurement object, but instead measures the propagation state of the second measurement object (S1230). If the measurement result of the second measurement object satisfies the threshold value, the user terminal performs an operation for reporting the measurement result to the base station. If the timer expires by a preset value, the user terminal does not measure the second measurement target and again performs only the measurement on the first measurement target.
- the user terminal only needs to measure one measurement object at one measurement time, thereby reducing measurement load or power consumption.
- an embodiment of the present invention proposes a method of correcting and using a measurement result report condition (for example, a threshold value) among measurement settings received from a base station in real time according to a state of a user terminal. That is, the user terminal performs the measurement according to the measurement setting, and when determining whether to report the measurement result according to the measurement result that reaches the measurement target, instead of using a predetermined reporting condition (for example, the threshold value), it is changed in real time Is to use conditions.
- a measurement result report condition for example, a threshold value
- the user terminal may adjust the reporting conditions in real time according to the moving speed, or at the same time, the user terminals located in the similar area report the measurement results at the same time and generate a small random number to reduce the handover occurring simultaneously. It is also possible to adjust the conditions.
- FIG. 13 illustrates an operation of a user terminal according to an embodiment of the present invention.
- the user terminal receives measurement setting information from the base station (S1300).
- the measurement setting information may include one or more measurement targets (frequency / cell), one or more reporting conditions (thresholds), and one or more offsets.
- the correction value may include a frequency-specific correction value for correcting a measurement result according to transmission characteristics by frequency, a cell-specific correction value for correcting the measurement results according to transmission characteristics by cells, and a hysteresis parameter.
- the user terminal performs measurement according to the set information (S1310). That is, the user terminal measures a radio condition (radio condition or radio parameter) of the measurement target, and the radio wave state may be RSRP (Reference Signal Received Power) or RSRQ (Reference Signal Received Quality).
- the user terminal may use a reporting condition included in the measurement setting, for example, a threshold value, to determine whether to report the measurement result.
- the user terminal may change and use a reporting condition in real time in order to reflect the real time state of the user terminal or to prevent the handover from being driven in a specific area.
- the degree to which the reporting condition is changed may be determined in proportion to or inversely proportional to the state of the user terminal.
- the user terminal determines that the probability of handover is high when the moving speed is high, and may change the threshold included in the measurement setting to a smaller value.
- the degree of movement may be proportional to the speed of movement.
- the user terminal may generate and add a random number having a relatively small negative or positive value to the threshold value in order to temporarily prevent the measurement result from being concentrated. If the user terminal is satisfied by comparing the measured result with the adjusted measurement report condition, and reports the measurement result to the base station (S1320).
- the user terminal may perform the measurement using only one of them. For example, if it is necessary to report a measurement result by measuring two measurement targets, the user terminal may measure one of the two measurement targets even if two measurement targets include different measurement reporting conditions. Only reporting conditions may be selected and measurement reporting conditions may be applied to the measurement results of both measurement objects to determine whether to report the measurement.
- FIG. 14 illustrates an operation of a user terminal according to an embodiment of the present invention.
- the user terminal receives measurement setting information from the base station (S1400).
- the measurement setting information may include one or more measurement targets (frequency / cell), one or more reporting conditions (thresholds), and one or more offsets.
- the correction value may include a frequency-specific correction value for correcting a measurement result according to transmission characteristics by frequency, a cell-specific correction value for correcting the measurement results according to transmission characteristics by cells, and a hysteresis parameter.
- the measurement report setting is to be made based on the measurement result of two or more cells (for example, if the RSRP of the cell to which the user terminal accesses is less than or equal to T1 and the RSRP of the neighboring cell is greater than or equal to T2, the measurement result reporting starts. ),
- the user terminal does not perform all the measurements for the various measurement targets.
- the embodiment of the present invention will now be described only in the case of using measurement results for two cells, but the main point of the present embodiment can be applied to the case where the measurement result of two or more cells should be used without major change. .
- the user terminal selects only one of the measurement report conditions for the two measurement targets to be used later (S1410).
- the two measurement report conditions which one is preferentially selected may be selected using a priority set in advance in the user terminal, using information included in the measurement setting, or randomly.
- the user terminal may use the reporting condition for the primary cell or the serving cell to measure the neighbor cell instead of the reporting condition for the neighbor cell.
- the user terminal uses the selected reporting condition to compare the measurement results of several cells. For example, when the measurement result of the primary cell or the serving cell is less than T1 and larger than T2 and the neighbor cell in the measurement configuration, the UE is configured to report the measurement result. If the measurement result of the cell or serving cell is smaller than T1 and larger than the measurement result of the neighboring cell and T1, the measurement result may be reported (S1420).
- 15 is a block diagram illustrating an internal structure of a user terminal according to an embodiment of the present invention.
- a user terminal of the present invention may include a wireless transceiver 1510, a storage 1520, and a controller 1530.
- the wireless transceiver 1510 performs a function of transmitting and receiving corresponding data for wireless communication of the user terminal.
- the wireless transceiver 1510 may be configured as an RF transmitter for upconverting and amplifying a frequency of a transmitted signal, and an RF receiver for low noise amplifying and downconverting a received signal.
- the wireless transceiver 1510 may receive data through a wireless channel, output the data to the controller 1530, and transmit data output from the controller 1530 through a wireless channel.
- the storage unit 1520 stores programs and data necessary for the operation of the user terminal.
- a report condition (threshold value) modified by reflecting the correction value described in the foregoing embodiment (the embodiment associated with FIGS. 10 to 14) may be stored.
- the controller 1530 controls the signal flow between blocks so that the user terminal can operate according to an embodiment of the present invention.
- controller 1530 may control the user terminal to operate according to another embodiment of the present invention.
- step S1110 of FIG. 11 may be included in the execution process of FIG. 12.
- the user terminal searches for and compares a previously calculated and stored threshold value according to frequency and cell information of a measurement target. (For example, when the measurement target corresponds to the frequency f and the cell c, T (f, c) among the stored values is used), and if the condition is satisfied, the operation of reporting the measurement result to the base station may be further performed. .
- all steps may optionally be subject to performance or to be omitted.
- the steps do not necessarily have to occur in order and may be reversed.
Abstract
Description
Claims (16)
- 이동 통신 시스템에서 단말의 IMS(IP multimedia subsystem) 보이스(voice)를 지원하기 위한 방법에 있어서,상기 단말이 네트워크 노드로부터 병합 트랙킹 영역 업데이트(combined TAU : tracking area update)와 연관된 메시지를 수신하는 단계;상기 단말이 상기 수신된 메시지에 포함된 정보를 기초로 네트워크가 IMS voice를 지원하는지 여부를 결정하는 단계; 및상기 네트워크가 상기 IMS voice를 지원하지 않고 지속되는 EPS(Evolved Packet System) 베어러 컨텍스트(persistent EPS bearer context)와 연관된 베어러가 활성화 되어 있는 경우에는, 상기 단말이 상기 베어러가 해제될 때까지 대기하는 단계를 포함하는 것을 특징으로 하는 단말의 IMS voice를 지원하기 위한 방법.
- 제 1항에 있어서,상기 단말이 combined TAU를 요청하는 메시지를 상기 네트워크 노드로 전송하는 단계를 더 포함하는 것을 특징으로 하는 단말의 IMS voice를 지원하기 위한 방법.
- 제 1항에 있어서,상기 단말이 상기 베어러가 활성화 되어 있는지 여부를 확인하는 단계를 더 포함하는 것을 특징으로 하는 단말의 IMS voice를 지원하기 위한 방법.
- 제 1항에 있어서,상기 수신된 메시지에 포함된 정보는 상기 수신된 메시지의 EPS 네트워크 요소 지원 정보(EPS network feature support information)에 포함된 지시자(indicator)인 것을 특징으로 하는 단말의 IMS voice를 지원하기 위한 방법.
- 제 1항에 있어서,상기 베어러가 해제된 경우에는, 상기 단말이 GERAN(GSM EDGE Radio Access Network) 또는 UTRAN(Universal Terrestrial Radio Access Network) 라디오 액세스 기술(radio access technology)를 선택하는 단계; 및상기 베어러가 해제된 경우에는, 상기 단말이 E-UTRAN 기능(capability)를 끄는(disable) 단계 중 적어도 하나를 더 포함하는 것을 특징으로 하는 단말의 IMS voice를 지원하기 위한 방법.
- 이동 통신 시스템에서 IMS(IP multimedia subsystem) 보이스(voice)를 지원하기 위한 단말에 있어서,네트워크 노드로부터 병합 트랙킹 영역 업데이트(combined TAU : tracking area update)와 연관된 메시지를 수신하는 통신부; 및상기 수신된 메시지에 포함된 정보를 기초로 네트워크가 IMS voice를 지원하는지 여부를 결정하고, 상기 네트워크가 상기 IMS voice를 지원하지 않고 지속되는 EPS(Evolved Packet System) 베어러 컨텍스트(persistent EPS bearer context)와 연관된 베어러가 활성화 되어 있는 경우에는, 상기 단말이 상기 베어러가 해제될 때까지 대기하도록 제어하는 제어부를 포함하는 것을 특징으로 하는 단말.
- 제 1항에 있어서,상기 통신부는 combined TAU를 요청하는 메시지를 상기 네트워크 노드로 전송하는 것을 특징으로 하는 단말.
- 제 1항에 있어서,상기 제어부는 상기 베어러가 활성화 되어 있는지 여부를 확인하는 것을 특징으로 하는 단말.
- 제 1항에 있어서,상기 수신된 메시지에 포함된 정보는 상기 수신된 메시지의 EPS 네트워크 요소 지원 정보(EPS network feature support information)에 포함된 지시자(indicator)인 것을 특징으로 하는 단말.
- 제 1항에 있어서,상기 제어부는,상기 베어러가 해제된 경우에는, GERAN(GSM EDGE Radio Access Network) 또는 UTRAN(Universal Terrestrial Radio Access Network) 라디오 액세스 기술(radio access technology)를 선택하는 것; 및상기 베어러가 해제된 경우에는, E-UTRAN 기능(capability)를 끄는(disable) 것 중 적어도 하나를 더 수행하는 것을 특징으로 하는 단말.
- 이동 통신 시스템에서 MME(Mobility Management Entity)의 IMS(IP multimedia subsystem) 보이스(voice)를 지원하기 위한 방법에 있어서,상기 MME가 단말로부터 병합 트랙킹 영역 업데이트(combined TAU : tracking area update)를 요청하는 메시지를 수신하는 단계; 및상기 메시지 수신에 응답하여, 네트워크가 IMS voice를 지원하는지 여부를 결정하기 위한 정보를 포함하는 메시지를 상기 단말로 전송하는 단계를 포함하고,상기 정보가 상기 네트워크가 상기 IMS voice를 지원하지 않는다는 것과 연관되고 상기 단말을 위한 지속되는 EPS(Evolved Packet System) 베어러 컨텍스트(persistent EPS bearer context)와 연관된 베어러가 활성화된 경우에는, 상기 베어러는 상기 단말에 의해 단말 내부적으로(locally) 해제되지 않는 것을 특징으로 하는 MME의 IMS voice를 지원하기 위한 방법.
- 제 11항에 있어서,상기 정보는 상기 전송된 메시지의 EPS 네트워크 요소 지원 정보(EPS network feature support information)에 포함된 지시자(indicator)인 것을 특징으로 하는 MME의 IMS voice를 지원하기 위한 방법.
- 이동 통신 시스템에서 IMS(IP multimedia subsystem) 보이스(voice)를 지원하기 위한 MME(Mobility Management Entity)에 있어서,단말로부터 병합 트랙킹 영역 업데이트(combined TAU : tracking area update)를 요청하는 메시지를 수신하는 통신부; 및상기 메시지 수신에 응답하여, 네트워크가 IMS voice를 지원하는지 여부를 결정하기 위한 정보를 포함하는 메시지를 상기 단말로 전송되도록 제어하는 제어부를 포함하고,상기 정보가 상기 네트워크가 상기 IMS voice를 지원하지 않는다는 것과 연관되고 상기 단말을 위한 지속되는 EPS(Evolved Packet System) 베어러 컨텍스트(persistent EPS bearer context)와 연관된 베어러가 활성화된 경우에는, 상기 베어러는 상기 단말에 의해 단말 내부적으로(locally) 해제되지 않는 것을 특징으로 하는 MME.
- 제 13항에 있어서,상기 정보는 상기 전송된 메시지의 EPS 네트워크 요소 지원 정보(EPS network feature support information)에 포함된 지시자(indicator)인 것을 특징으로 하는 MME.
- 이동 통신 시스템에서 기지국의 IMS(IP multimedia subsystem) 보이스(voice)를 지원하기 위한 방법에 있어서상기 기지국이 단말의 핸드오버(HO : Handover)가 필요함을 감지하는 단계; 및상기 핸드오버를 위한 대상 기지국이 상기 IMS voice를 지원하지 않는 경우에는, LTE(Long Term Evolution)로 PS(Packet Switched) HO를 수행하는 단계를 포함하는 것을 특징으로 하는 기지국의 IMS voice를 지원하기 위한 방법.
- 이동 통신 시스템에서 IMS(IP multimedia subsystem) 보이스(voice)를 지원하기 위한 기지국에 있어서,상기 기지국으로부터 정보를 수신하는 통신부; 및상기 수신된 정보를 기초로 상기 기지국이 단말의 핸드오버(HO : Handover)가 필요함을 감지하고, 상기 핸드오버를 위한 대상 기지국이 상기 IMS voice를 지원하지 않는 경우에는, LTE(Long Term Evolution)로 PS(Packet Switched) HO가 수행되도록 제어하는 제어부를 포함하는 것을 특징으로 하는 기지국.
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CN110784604B (zh) | 2021-09-07 |
EP3029966A4 (en) | 2017-03-15 |
EP3503604A1 (en) | 2019-06-26 |
KR102207492B1 (ko) | 2021-01-26 |
KR20150014837A (ko) | 2015-02-09 |
AU2014296985B2 (en) | 2017-11-23 |
CN104956702B (zh) | 2019-12-17 |
US20150358477A1 (en) | 2015-12-10 |
EP3029966B1 (en) | 2019-01-30 |
US10778850B2 (en) | 2020-09-15 |
AU2014296985A1 (en) | 2015-08-13 |
EP3029966A1 (en) | 2016-06-08 |
KR20150014834A (ko) | 2015-02-09 |
EP3503604B1 (en) | 2021-05-26 |
AU2014296985A2 (en) | 2015-09-24 |
US20190089841A1 (en) | 2019-03-21 |
CN110784604A (zh) | 2020-02-11 |
US10142490B2 (en) | 2018-11-27 |
CN104956702A (zh) | 2015-09-30 |
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