WO2018143245A1

WO2018143245A1 - Radio terminal, processor and base station

Info

Publication number: WO2018143245A1
Application number: PCT/JP2018/003136
Authority: WO
Inventors: 真人藤代
Original assignee: 京セラ株式会社
Priority date: 2017-02-03
Filing date: 2018-01-31
Publication date: 2018-08-09

Abstract

This radio terminal is provided with a receiver and a controller. The receiver receives measurement setting information from a base station. The measurement setting information includes identification information for identifying an association between a measurement target and multiple references for triggering a measurement report. On the basis of the aforementioned multiple references specified by the identification information, the controller reports to the base station a measurement result about the measurement target associated with the multiple references.

Description

Wireless terminal, processor and base station

The present disclosure relates to a wireless terminal, a processor, and a base station.

In 3GPP (3rd Generation Partnership Project), which is a standardization project for mobile communication systems, specifications for wireless environment measurement (Measurement) in wireless terminals are being developed (see Non-Patent Document 1).

The base station transmits measurement setting information to the wireless terminal. The wireless terminal measures the wireless environment based on the measurement setting information and reports the measurement result to the base station.

In the measurement setting information transmitted from the base station to the wireless terminal, one reference for triggering a measurement report and one measurement object are associated. Each time one criterion is satisfied, the wireless terminal reports a measurement result for a measurement object associated with the criterion to the base station.

The wireless terminal according to one embodiment includes a receiver and a controller. The receiver is configured to receive measurement configuration information from a base station. The measurement setting information includes identification information for identifying an association between a plurality of criteria for triggering a measurement report and a measurement object. The controller is configured to report a measurement result for the measurement object associated with the plurality of criteria to the base station based on the plurality of criteria specified by the identification information.

The processor according to one embodiment is a processor for controlling a wireless terminal. The processor executes a process of receiving measurement setting information from the base station. The measurement setting information includes identification information for identifying an association between a plurality of criteria for triggering a measurement report and a measurement object. The processor executes a process of reporting a measurement result for the measurement object associated with the plurality of criteria to the base station based on the plurality of criteria specified by the identification information.

The base station according to one embodiment includes a controller, a transmitter, and a receiver. The controller is configured to include, in the measurement setting information, identification information for identifying an association between a plurality of criteria for triggering a measurement report and a measurement object. The transmitter is configured to transmit the measurement setting information to a wireless terminal. The receiver is configured to receive a report of measurement results based on the plurality of criteria specified by the identification information from the wireless terminal. The measurement result is a measurement result for the measurement object associated with the plurality of criteria.

FIG. 1 is a diagram illustrating a configuration of a mobile communication system. FIG. 2 is a protocol stack diagram of the radio interface. FIG. 3 is a block diagram of the UE 100. FIG. 4 is a block diagram of BS 200. FIG. 5 is a sequence diagram for explaining the operation according to the embodiment. FIG. 6 is a flowchart for explaining the operation of the BS 200 according to the embodiment. FIG. 7 is a flowchart for explaining the operation of the UE 100 according to the embodiment.

[Outline of Embodiment]
A wireless terminal according to an embodiment includes a receiver and a controller. The receiver is configured to receive measurement configuration information from a base station. The measurement setting information includes identification information for identifying an association between a plurality of criteria for triggering a measurement report and a measurement object. The controller is configured to report a measurement result for the measurement object associated with the plurality of criteria to the base station based on the plurality of criteria specified by the identification information.

The controller may be configured to report the measurement result to the base station when all the plurality of criteria are satisfied.

The measurement setting information may include an identifier for identifying whether an established condition for the plurality of trigger criteria is an AND condition or an OR condition.

The measurement setting information may include information indicating a predetermined standard added to the plurality of standards.

The measurement setting information may include time information indicating a time until a criterion for triggering the measurement report is satisfied. The time information may be a value common to the plurality of criteria.

The measurement setting information may include time information indicating a time until a criterion for triggering the measurement report is satisfied. Each of the plurality of criteria may be associated with the time information.

The plurality of standards may include a first standard related only to a radio signal from the first cell and a second standard related to a radio signal from the second cell. The controller may be configured to initiate an evaluation for the second criterion in response to the first criterion being met.

The controller may be configured to sequentially perform evaluations as to whether the plurality of criteria are satisfied without simultaneously performing evaluations as to whether the plurality of criteria are satisfied.

The controller may be configured to report the measurement result to the base station when each of the plurality of criteria is continuously satisfied.

The controller may be configured to report the measurement result of the measurement object associated with the plurality of criteria by the identification information in one message.

[Embodiment]
(Mobile communication system)
Hereinafter, the mobile communication system will be described. FIG. 1 is a diagram illustrating a configuration of a mobile communication system. An LTE system will be described as an example of a mobile communication system.

As shown in FIG. 1, the LTE system includes a UE (User Equipment) 100, an E-UTRAN (Evolved Universal Terrestrial Radio Access Network) 10, and an EPC (Evolved Packet Core) 20.

UE 100 corresponds to a communication device (wireless terminal). The UE 100 is a mobile communication device. UE100 performs radio | wireless communication with a cell (BS200 mentioned later). The configuration of the UE 100 will be described later.

E-UTRAN 10 corresponds to a radio access network. The E-UTRAN 10 includes a BS (BASE STATION) 200. BS 200 corresponds to a base station. The BS 200 is, for example, an eNB 200 (evolved Node-B). BS 200 may be a node that can execute radio communication with UE 100. For example, the BS 200 may be gNB (next Generation Node-B). The BSs 200 may be connected to each other via an X2 interface. The configuration of BS 200 will be described later.

BS 200 manages one or a plurality of cells. BS 200 performs radio communication with UE 100 that has established a connection with a cell managed by BS 200. BS 200 has a radio resource management (RRM) function, a routing function of user data (hereinafter also referred to as “data”), a measurement control function for mobility control / scheduling, and the like.

“Cell” is used as a term indicating the minimum unit of a wireless communication area. “Cell” may also be used as a term indicating a function of performing wireless communication with the UE 100. A “cell” may be a downlink resource. A “cell” may be a combination of downlink resources and uplink resources. A link between the carrier frequency of the downlink resource and the carrier frequency of the uplink resource may be included in the system information transmitted on the downlink resource.

The EPC 20 corresponds to a core network. The EPC 20 may form a network together with the E-UTRAN 10. The EPC 20 includes an MME (Mobility Management Entity) 300 and an SGW (Serving Gateway) 400.

The MME 300 performs various mobility controls for the UE 100, for example. For example, the SGW 400 performs data transfer control. The MME 300 and the SGW 400 are connected to the BS 200 via the S1 interface.

FIG. 2 is a protocol stack diagram of a radio interface in the LTE system. As shown in FIG. 2, the radio interface protocol is divided into the first layer (layer 1) to the third layer (layer 3) of the OSI reference model. The first layer is a physical (PHY) layer (physical layer). The second layer (layer 2) includes a MAC (Medium Access Control) layer (MAC layer), an RLC (Radio Link Control) layer (RLC layer), and a PDCP (Packet Data Convergence Protocol) layer (PRCP layer). The third layer (layer 3) includes an RRC (Radio Resource Control) layer (RRC layer).

The physical layer performs encoding / decoding, modulation / demodulation, antenna mapping / demapping, and resource mapping / demapping. Data and control signals are transmitted between the physical layer of the UE 100 and the physical layer of the BS 200 via a physical channel.

The MAC layer performs data priority control, retransmission processing by hybrid ARQ (HARQ), random access procedure, and the like. Data and control signals are transmitted between the MAC layer of the UE 100 and the MAC layer of the BS 200 via a transport channel. The MAC layer of BS 200 includes a scheduler (MAC scheduler). The scheduler determines the uplink / downlink transport format (transport block size, modulation and coding scheme (MCS)) and the resource blocks allocated to the UE 100.

The RLC layer transmits data to the RLC layer on the receiving side using the functions of the MAC layer and the physical layer. Data and control signals are transmitted between the RLC layer of the UE 100 and the RLC layer of the BS 200 via a logical channel.

The PDCP layer performs header compression / decompression and encryption (ciphering) / decryption (deciphering).

The RRC layer is defined only in the control plane that handles control signals. Messages for various settings (RRC messages) are transmitted between the RRC layer of the UE 100 and the RRC layer of the BS 200. The RRC layer controls the logical channel, the transport channel, and the physical channel according to establishment, re-establishment, and release of the radio bearer. When there is an RRC connection between the RRC of the UE 100 and the RRC of the BS 200, the UE 100 is in the RRC connected state. When there is no RRC connection between the RRC of the UE 100 and the RRC of the BS 200, the UE 100 is in the RRC idle state.

A NAS (Non-Access Stratum) layer located above the RRC layer performs, for example, session management and mobility management.

(Wireless terminal)
The UE 100 (wireless terminal) according to the embodiment will be described. FIG. 3 is a block diagram of the UE 100. As illustrated in FIG. 3, the UE 100 includes a receiver (receiver) 110, a transmitter (transmitter) 120, and a controller (controller) 130. The receiver 110 and the transmitter 120 may be an integrated transceiver (transmission / reception unit).

The receiver 110 performs various types of reception under the control of the controller 130. The receiver 110 includes an antenna. The receiver 110 converts a radio signal received by the antenna into a baseband signal (received signal). The receiver 110 outputs a baseband signal to the controller 130.

The transmitter 120 performs various transmissions under the control of the controller 130. The transmitter 120 includes an antenna. The transmitter 120 converts the baseband signal (transmission signal) output from the controller 130 into a radio signal. The transmitter 130 transmits a radio signal from the antenna.

The controller 130 performs various controls in the UE 100. The controller 130 includes a processor and a memory. The memory stores a program executed by the processor and information used for processing by the processor. The processor includes a baseband processor and a CPU (Central Processing Unit). The baseband processor performs, for example, modulation / demodulation and encoding / decoding of a baseband signal. The CPU performs various processes by executing programs stored in the memory. The processor may include a codec that performs encoding / decoding of an audio / video signal. The processor executes various processes described later and various communication protocols described above.

The UE 100 may include a GNSS (Global Navigation Satellite System) receiver. The GNSS receiver can receive a GNSS signal in order to obtain location information indicating the geographical location of the UE 100. The GNSS receiver outputs a GNSS signal to the controller 130. The UE 100 may have a GPS (Global Positioning System) function for acquiring location information of the UE 100.

In this specification, a process executed by at least one of the receiver 110, the transmitter 120, and the controller 130 included in the UE 100 will be described as a process (operation) executed by the UE 100 for convenience.

(base station)
The BS 200 (base station) according to the embodiment will be described. FIG. 4 is a block diagram of BS 200. As shown in FIG. 4, the BS 200 includes a receiver (reception unit) 210, a transmitter (transmission unit) 220, a controller (control unit) 230, and a network interface 240. The transmitter 210 and the receiver 220 may be an integrated transceiver (transmission / reception unit).

The receiver 210 performs various types of reception under the control of the controller 230. The receiver 210 includes an antenna. The receiver 210 converts a radio signal received by the antenna into a baseband signal (received signal). The receiver 210 outputs a baseband signal to the controller 230.

The transmitter 220 performs various transmissions under the control of the controller 230. The transmitter 220 includes an antenna. The transmitter 220 converts the baseband signal (transmission signal) output from the controller 230 into a radio signal. The transmitter 220 transmits a radio signal from the antenna.

The controller 230 performs various controls in the BS 200. The controller 230 includes a processor and a memory. The memory stores a program executed by the processor and information used for processing by the processor. The processor includes a baseband processor and a CPU. The baseband processor performs, for example, modulation / demodulation and encoding / decoding of a baseband signal. The CPU performs various processes by executing programs stored in the memory. The processor executes various processes described later and various communication protocols described above.

The network interface 240 is connected to the adjacent BS 200 via the X2 interface. The network interface 240 is connected to the MME 300 and the SGW 400 via the S1 interface. The network interface 240 is used for communication performed on the X2 interface and communication performed on the S1 interface, for example.

In this specification, a process executed by at least one of the transmitter 210, the receiver 220, the controller 230, and the network interface 240 included in the BS 200 will be described as a process (operation) executed by the BS 200 for convenience.

(Measurement setting information)
The measurement setting information (Measurement Configuration) will be described.

The measurement setting information is information related to the measurement set in the UE 100. The measurement setting information (for example, MeasConfig) can specify a measurement to be performed by the UE 100, for example.

The measurement setting information includes, for example, the following information.

Measurement object list related to measurement objects (for example, measObjectToRemoveList, measObjectToAddModList)
Report setting list related to report settings (for example, reportConfigToRemoveList, reportConfigToAddModList)
Measurement identifier list for measurement identifiers (eg, measIdToRemoveList, measIdToAddModList)

The measurement target list may be a list for adding or changing a measurement target. The measurement target list may be a list for excluding the measurement target set in the UE 100.

In the measurement object list, measurement object identifiers (for example, measObjectId) and measurement object settings (for example, measObject, measObjectEUTRA, measObjectUTRA, measObjectGERAN, measObjectCDMA2000, measObjectWLAN, etc.) are associated. Specifically, the measurement target list is a list of information (for example, MeasObjectToAddMod) indicating a correspondence relationship between the measurement target identifier and the measurement target setting.

The measurement target identifier is used to identify the measurement target (setting). The measurement target setting is a setting for specifying the measurement target. The measurement target setting may include information such as a carrier frequency that is a measurement target and a list of cells that are the measurement target.

The report setting list may be a list for adding or changing report settings. The report setting list may be a list for excluding report settings set for the UE 100.

In the report setting list, a report setting identifier (for example, reportConfigId) is associated with a report setting (for example, reportConfig, ReportConfigEUTRA, reportConfigInterRAT, etc.). Specifically, the report setting list is a list of information (for example, ReportConfigToAddMod) indicating the correspondence between the report setting identifier and the report setting.

The report setting identifier is used to identify the report setting (measurement report setting). The report setting (measurement report setting) is a setting for specifying a measurement report method. The report setting may specify a trigger criterion for triggering the measurement report.

The report setting includes trigger type information (for example, triggerType) indicating a trigger criterion. The trigger type information may include event identification information (for example, eventId) for identifying an event and parameters related to the event (for example, hysteresis, timeToTrigger, etc.). The UE 100 can specify the trigger criterion based on the event identification information and the parameters related to the event.

The event identification information indicates one of the following events, for example.

Event A1: The reception level of the radio signal from the serving cell becomes better than the absolute threshold value.
Event A2: The reception level of the radio signal from the serving cell becomes worse than the absolute threshold value.
Event A3: The reception level of the radio signal from the adjacent cell becomes an offset amount larger than the reception level of the radio signal from the P cell (Primary Cell) / (or) PS cell (Primary SCell).
Event A4 (B1): The reception level of the radio signal from the adjacent cell becomes better than the absolute threshold value.
Event A5 (B2): The reception level of the radio signal from the P cell / (or) PS cell becomes worse than the absolute threshold 1, and the reception level of the radio signal from the adjacent cell It becomes better than the typical threshold value 2.
Event A6: The reception level of the radio signal from the adjacent cell is larger than the reception level of the radio signal from the S cell (Secondary Cell).
Event C1: CSI-RS (Channel State Information-Reference Signal) resource becomes higher than an absolute threshold.
Event C2: CSI-RS (Channel State Information-Reference Signal) resource has a larger offset amount than the reference CSI-RS resource.
Event W1: The reception level of the radio signal from the WLAN (Wireless Local Area Network) becomes better than the threshold value.
Event W2: The reception level of radio signals from all WLANs in the WLAN mobility set is worse than the threshold value 1, and the reception level of radio signals from WLANs outside the WLAN mobility set is better than the threshold value 2. Become.
Event W3: Reception levels of radio signals from all WLANs in WLAN mobility become worse than an absolute threshold.

The reception level may be a reception signal strength (RSRP: Reference Signal Received Power). The reception level may be received signal quality (RSRQ: Reference Signal Received Quality). The radio signal may be a reference signal (Reference Signal).

The WLAN may be a WLAN access point configured based on, for example, IEEE 802.11 standards. A WLAN mobility set includes one or more WLAN access point (AP) identifiers (for example, BSSID (Basic Service Set Indentifier), HESSID (Homeogenous Extended Service Identifier), or SSID (ServiceInset Set). .

The event identification information may indicate an event different from the above event. The event identification information may indicate an event related to the moving speed of the UE 100. The event identification information may indicate an event related to the position of the UE 100. Specifically, the event identification information may indicate one of the following events, for example.

Event a: the moving speed of the UE 100 is larger than the absolute threshold. Event b: the moving speed of the UE 100 is smaller than the absolute threshold. Event c: the UE 100 is located in a predetermined area. Event d: UE 100 is located outside a predetermined area

The event identification information may include parameters related to the event (for example, threshold information, offset value information, geographic information indicating a predetermined area, etc.).

The parameter relating to the event may include, for example, time information (timeToTrigger) indicating a time until the trigger criterion is satisfied. The UE 100 triggers a measurement report when the trigger criteria continues to be satisfied for the time indicated by the time information. The parameter relating to the event may be a heterolysis value that is a parameter used in the entry / exit conditions of the event.

The measurement identifier list may be a list for adding or changing a measurement identifier. In this case, the measurement identifier list may include a measurement identifier (for example, measId), an associated measurement object identifier, and an associated report setting identifier for each entry. That is, the measurement identifier list may be a list of information (for example, MeasIdToAddMod) indicating a correspondence relationship between the measurement identifier, the measurement target identifier, and the report setting identifier.

The measurement identifier list may be a list for excluding measurement identifiers. In this case, the measurement identifier list may be a list of measurement identifiers to be excluded from the UE 100 settings.

The measurement identifier is used to identify the association between the measurement target and the report setting. The measurement identifier may be used to identify a measurement setting.

The measurement identifier may be identification information for identifying an association between a plurality of trigger criteria for triggering a measurement report and a measurement target.

For example, the following shows an example of the association between a plurality of trigger criteria and measurement objects.

(A) First case

Table 1 shows an example of a measurement identifier list. As shown in Table 1, one measurement identifier (for example, measId # m) includes one measurement object identifier (for example, measObjectId # m), and a plurality of report setting identifiers (for example, reportConfigId # m, reportConfigId # n, …). Thereby, a plurality of trigger references and one measurement object are associated with each other.

The UE 100 identifies a plurality of report settings by a plurality of report setting identifiers associated with one measurement identifier. The UE 100 specifies a plurality of trigger criteria according to each of the identified plurality of report settings.

UE100 may report the measurement result linked | related with the measurement identifier to BS200 according to all the some trigger criteria being satisfy | filled.

The measurement setting information may include a condition identifier (and / or) for identifying whether the establishment condition for a plurality of trigger criteria is an AND condition or an OR condition. The AND condition is a condition that is satisfied when a plurality of trigger criteria are all satisfied. The OR condition is a condition that is satisfied when one of the plurality of trigger criteria is satisfied.

The condition identifier may be a common identifier for all measurement identifiers included in the measurement setting information. In this case, one condition identifier may be included in the measurement setting information.

The condition identifier may be associated with each measurement identifier. For example, in the case of Table 2, an identifier (and) indicating an AND condition is associated with measId # 1. Therefore, UE100 reports the measurement result about the measurement object shown by measObjectId # 1 according to the fact that each trigger criterion included in each of reportConfigId # 1 and reportConfigId # 2 is satisfied. On the other hand, an identifier (or) indicating an OR condition is associated with measId # 2. UE100 reports the measurement result about the measurement object shown by measObjectId # 2 according to which one of the trigger criteria contained in each of reportConfigId # 1, reportConfigId # 2, ... is satisfy | filled.

When each report setting includes time information (TTT: TimeToTrigger), each of a plurality of trigger criteria is associated with time information. A measurement report may be triggered in response to each trigger criterion continuing to be satisfied for the time indicated by the TTT associated with each trigger criterion. When the conditions for establishing the plurality of trigger criteria is an AND condition, in response to the fact that all of the plurality of trigger criteria continue to be satisfied during the time indicated by the longest TTT among the plurality of associated TTTs The measurement report may be triggered. A measurement report may be triggered in response to all of the multiple trigger criteria being met for the time indicated by the shortest TTT of the associated multiple TTTs. That is, the shortest TTT is a minimum overlap period in which all of the plurality of trigger criteria are continuously satisfied.

Multiple trigger criteria (one measurement identifier) and one time information (TTT) may be associated. That is, a common value may be set for a plurality of trigger references as TTT.

(B) Second Case The second case will be described. A description of the same parts as those in the above case will be omitted.

Table 3 shows an example of a measurement identifier list. As shown in Table 3, one measurement identifier (for example, measId # m) is associated with one measurement target identifier (for example, measObjectId # m) and one report setting identifier (for example, reportConfigId # m). May be. In this case, the report setting identified by the report setting identifier includes a trigger type identifier (eg, triggerTypeId # m). The trigger type identifier is an identifier used to specify trigger type information. The trigger type identifier may be associated with one measurement object identifier without being included in the report setting identifier.

The measurement setting information may include, for example, a trigger type list (for example, triggerTypeList) shown in Table 4.

In the trigger type list, a trigger type identifier (for example, triggerTypeId # m) and a plurality of trigger type information (for example, triggerType # m, triggerType # n,...) Are associated. Thereby, a plurality of trigger references and one measurement object are associated with each other.

The UE 100 identifies a plurality of pieces of trigger type information based on a report setting identifier (trigger type identifier) associated with one measurement identifier using the trigger type list. The UE 100 can specify a plurality of trigger criteria by each of the plurality of trigger type information.

The trigger type list may include one condition identifier (common). A condition identifier may be associated with each trigger type identifier. Similar to the first case described above, a condition identifier may be associated with each measurement identifier.

(C) Third Case A third case will be described. A description of the same parts as those in the above case will be omitted.

Table 5 shows an example of the measurement identifier list. As shown in Table 5, one measurement identifier (for example, measId # m) is associated with one measurement object identifier (for example, measObjectId # m) and one report setting identifier (for example, reportConfigId # m). May be. In this case, the report setting identified by the report setting identifier is associated with a plurality of event identification information (eventId # m, eventId # n,...). The UE 100 can specify a report setting by a report setting identifier associated with one measurement identifier. As a result, the UE 100 can specify a plurality of trigger criteria by a plurality of event identification information included in the report setting.

One measurement identifier may be associated with a plurality of event identification information. The UE 100 can specify a plurality of trigger criteria by a plurality of event identification information associated with one measurement identifier.

(D) Fourth Case The fourth case will be described. A description of the same parts as those in the above case will be omitted. The fourth case is a case in which the measurement setting information includes information indicating a predetermined standard added to a plurality of standards.

Table 6 shows an example of an event addition change list (for example, EventToAddModList). The event addition / change list is a list for adding or changing an event for one measurement target. The event addition / change list is included in the measurement setting information.

As shown in Table 6, in the event addition / change list, one measurement identifier (for example, measId # m) is associated with event identification information (for example, eventId # Ap, eventId # Aq) of an event to be added or changed. It is done.

UE100 specifies the event identification information linked | related with the measurement identifier in an event addition change list based on an event addition change list. Event identification information is added to the measurement identifier set in the UE 100. For example, as a setting of the UE 100, measId # m is associated with measObjectId # m and reportConfigId # m by information (for example, MeasIdToAddMod) indicating a correspondence relationship between a measurement identifier, a measurement target identifier, and a report setting identifier. Assuming that reportConfigId # m identifies reportConfig # m, and it is assumed that eventConfig # m includes eventId # Am.

The UE 100 further associates eventId # Ap and eventId # Aq with measId # m set in the UE 100 based on the event addition / change list, and stores the association. Thereby, in setting of UE100, not only eventId # Am but also eventId # Ap and eventId # Aq are associated with measId # m.

As a result, the UE 100 measures the measurement target (associated with measId # m) based on a plurality of trigger criteria associated with measId # m (events indicated by each of eventId # Am, eventId # Ap, and eventId # Aq). The measurement result of the measurement object (measObject # m) identified by measObjectId # m can be reported to the BS 200.

The measurement setting information may include an event exclusion list (for example, EventToRemoveList). The event exclusion list is a list for excluding events from one measurement target. In the event addition / change list, one measurement identifier (for example, measId # m) is associated with event identification information (for example, eventId # Am, eventId # An) of an event to be excluded.

UE100 excludes eventId # Ap and eventId # Aq linked | related with measId # m set to UE100 based on an event exclusion list | wrist, for example. Thereby, in UE100, even if the trigger criteria based on eventId # Ap and eventId # Aq are satisfied, the measurement target associated with measId # m (measObjectId # m (measObject # m)) The measurement result is not reported to BS200.

As described above, the measurement settings of the UE 100 can be flexibly changed.

(Operation according to the embodiment)
The operation according to the embodiment will be described with reference to FIGS.

FIG. 5 is a sequence diagram for explaining the operation according to the embodiment. FIG. 6 is a flowchart for explaining the operation of the BS 200 according to the embodiment. FIG. 7 is a flowchart for explaining the operation of the UE 100 according to the embodiment.

UE 100 exists in a range where it can receive signaling from BS 200. For example, the UE 100 is in a cell managed by the BS 200. The UE 100 is in an RRC connection state. Alternatively, the UE 100 may be in an RRC idle state.

As shown in FIG. 5, in step S110, the BS 200 transmits measurement setting information to the UE 100. The BS 200 may transmit the measurement setting information to the UE 100 by dedicated signaling (for example, an RRC connection reconfiguration message). The BS 200 may transmit the measurement setting information to the UE 100 by broadcast signaling (for example, SIB (System Information Block)) / group cast signaling.

The BS 200 includes identification information for identifying the association between a plurality of standards and a measurement object in the measurement setting information (S210 in FIG. 6). “Identification information” is, for example, a measurement target identifier.

For example, the BS 200 may associate one measurement target identifier with a plurality of report setting identifiers (see the first case). The BS 200 may include a measurement identifier list for indicating the association in the measurement setting information.

The BS 200 may associate one measurement target identifier with a report setting identifier (or trigger type identifier) for identifying a report setting including a trigger type identifier (see the second case). The BS 200 may include a measurement identifier list for indicating the association in the measurement setting information. The BS 200 may include a trigger type list in the measurement setting information. The BS 200 may not include the trigger type list in the measurement setting information when the trigger type list has already been transmitted to the UE 100. When updating the trigger type list, the BS 200 may include update information about the updated trigger type list in the measurement setting information. The update information may be the updated trigger type list itself. The update information may be a list for adding / changing / excluding updated information (trigger type identifier, trigger type information).

The BS 200 may associate one measurement target identifier with one report setting identifier (or a plurality of event identification information) for identifying a report setting including a plurality of event identification information (see the third case). . The BS 200 may include a measurement identifier list for indicating the association in the measurement setting information.

The BS 200 may associate one measurement target identifier with event identification information to be added / changed (see the fourth case). The BS 200 may include an event addition / change list for indicating the association in the measurement setting information.

BS200 includes the identification information for identifying the association between a plurality of criteria and the measurement target in the measurement setting information, and then transmits the measurement setting information to UE 100 (S220 in FIG. 6).

UE100 receives measurement setting information from BS200 (S310 of FIG. 7).

In step S120, the UE 100 starts measurement and trigger determination based on the measurement setting information.

The UE 100 identifies a plurality of trigger criteria based on the identification information included in the measurement setting information (S320 in FIG. 7).

For example, the UE 100 may specify a plurality of trigger criteria by a plurality of report setting identifiers associated with one measurement target identifier (see the first case). UE100 grasps | ascertains each trigger reference | standard prescribed | regulated by the trigger type information contained in each of several report setting. Thereby, the UE 100 can specify a plurality of trigger criteria.

The UE 100 may specify a plurality of trigger criteria by a report setting identifier (trigger type identifier) associated with one measurement target identifier (see the second case). UE100 identifies several trigger type information with a trigger type identifier using a trigger type list | wrist. UE100 grasps | ascertains several trigger criteria prescribed | regulated by several trigger type information. Thereby, the UE 100 can specify a plurality of trigger criteria.

The UE 100 may specify a plurality of trigger criteria by one report setting identifier (or a plurality of event identification information) associated with one measurement target identifier (see the third case). UE100 identifies each trigger type information by each of several event identification information (included in one report setting identifier). UE100 grasps | ascertains each trigger reference prescribed | regulated by each trigger type information. Thereby, the UE 100 can specify a plurality of trigger criteria.

The UE 100 may specify a plurality of trigger criteria based on event identification information to be added / changed associated with one measurement target identifier (see the fourth case). The UE 100 identifies each trigger type information based on event identification information set in the UE 100 and event identification information to be added / changed, which are associated with one measurement target identifier. UE100 grasps | ascertains each trigger reference prescribed | regulated by each trigger type information. Thereby, the UE 100 can specify a plurality of trigger criteria.

The UE 100 performs measurement and / or trigger determination (evaluation) on a measurement target associated with a plurality of trigger criteria (via one measurement identifier) (S330 in FIG. 7). In this specification, “evaluation” means “measurement” and / or “trigger determination (determination of whether or not a trigger criterion is satisfied)”. The measurement is a measurement of a wireless environment. For example, the UE 100 performs measurement according to the measurement target setting. UE100 can perform the measurement with respect to the carrier (frequency) and / or cell specified by the measurement object setting, for example. The UE 100 may perform measurement and trigger determination at the same time. The UE 100 may perform the trigger determination after finishing the measurement.

When the fulfillment conditions for the plurality of trigger criteria are AND conditions, that is, when the UE 100 reports the measurement result in response to all the plurality of trigger criteria being satisfied, the UE 100 may perform the following operations.

Suppose that the plurality of trigger criteria includes a first reference relating only to radio signals from the first cell and a second reference relating to radio signals from each of the first cell and the second cell. A plurality of trigger criteria are event A2 (the reception level of the radio signal from the serving cell (first cell) becomes worse than the absolute threshold) and event A3 (reception of the radio signal from the adjacent cell (second cell)) A case where the level is an offset amount larger than the reception level of the radio signal from the P cell / PS cell) will be described as an example.

1stly, UE100 may perform evaluation about a plurality of trigger criteria (event A2 and event A3) simultaneously. A measurement report may be triggered when a plurality of trigger criteria are all met.

Secondly, the UE 100 starts evaluating the neighboring cell in response to the event A2 being satisfied. That is, the UE 100 does not start the evaluation for the event A3 until the event A2 is satisfied. Thereby, since UE100 does not need to perform evaluation (measurement / trigger determination) about event A3, it can achieve power saving.

The UE 100 may evaluate whether or not the event A2 is satisfied even after starting the evaluation for the event A3. For example, when the time information (TTT) is an overlapping period, the UE 100 may evaluate whether the event A2 is satisfied even after the evaluation for the event A3 is started.

The UE 100 may sequentially perform the evaluation on whether the plurality of trigger criteria are satisfied without simultaneously performing the evaluation on whether the plurality of trigger criteria (event A2 and event A3) are satisfied. For example, the UE 100 alternately evaluates the event A2 and the event 3. Since the UE 100 does not evaluate a plurality of trigger criteria at the same time, power saving can be achieved.

When the UE 100 performs the evaluation in order, the measurement report may be triggered in response to a plurality of trigger criteria (event A2 and event A3) being successively satisfied. For example, the UE 100 alternately evaluates the event A2 and the event A3. The UE 100 can evaluate the event A3 regardless of whether or not the event A2 is satisfied. The UE 100 can determine that the plurality of trigger criteria are satisfied when the event A3 is satisfied after the event A2 is satisfied.

When the establishment condition for the plurality of trigger criteria is an OR condition, that is, when the UE 100 reports a measurement result in response to any of the trigger criteria being satisfied, the UE 100 performs the following operation. May be executed. A case where the plurality of trigger criteria are event A2 and event A3 will be described as an example.

1stly, UE100 may perform evaluation about a plurality of trigger criteria (event A2 and event A3) simultaneously. A measurement report may be triggered if one of the multiple trigger criteria is met.

Secondly, the UE 100 may sequentially perform the evaluation on whether the plurality of trigger criteria are satisfied without simultaneously performing the evaluation on whether the plurality of trigger criteria (event A2 and event A3) are satisfied. Good. Again, the measurement report may be triggered if one of the multiple trigger criteria is met. For example, the UE 100 alternately evaluates the event A2 and the event A3. Even if the event A2 is not satisfied, the UE 100 may determine that the measurement report is triggered when the event A3 is satisfied. Thereby, in UE100, the measurement report about the measuring object linked | related with the some trigger reference | standard by one measurement identifier is triggered.

The UE 100 executes the evaluation for the event A3 without triggering the measurement report even when the event A2 is satisfied. The UE 100 triggers the measurement report in response to determining that the event A3 is satisfied.

In step S130, the UE 100 reports a measurement report about the measurement object associated with the plurality of trigger criteria to the BS 200 based on the plurality of trigger criteria (S340 in FIG. 7).

The UE 100 may report the measurement result to the BS 200 when all of the plurality of trigger criteria are satisfied. The UE 100 may report the measurement result to the BS 200 in response to satisfying at least the trigger criteria of the plurality of trigger criteria. When the condition identifier (and / or) is associated with each of the plurality of trigger criteria, the UE 100 determines that the measurement result is in accordance with the fact that some of the trigger criteria are satisfied. May be reported to BS 200.

In the existing technology, one measurement identifier is associated with only one report setting, and one report setting includes only one event identification information. Therefore, every time one trigger criterion indicated by one event identification information is satisfied, the UE 100 has to report the measurement result of the measurement target to the BS 200. The UE 100 may report a measurement result that overlaps (at least in part).

On the other hand, in the present embodiment, the UE 100 can report a measurement report about a measurement object associated with a plurality of trigger criteria by one message. Thereby, the frequency | count of the measurement report about the overlapping measurement result can be reduced.

BS 200 receives a report of measurement results based on a plurality of trigger criteria from UE 100 (S230 in FIG. 6).

BS 200 executes control of UE 100 based on the measurement result.

As described above, the UE 100 can report, to the BS 200, measurement reports on measurement objects associated with a plurality of trigger criteria based on a plurality of trigger criteria. Thereby, UE100 can report a measurement result by the same trigger reference | standard as the said new event, without introducing the new event which can be expressed by the combination of the existing event. As a result, the same measurement result can be reported not only for the UE 100 for which the operation corresponding to the new event is guaranteed, but also for the existing UE 100. Also, standardization work for defining new events can be reduced.

Furthermore, the BS 200 can receive a measurement result for one measurement object based on a combination of existing events without causing the UE 100 to report a plurality of measurement results for one measurement object. Therefore, the overhead between the UE 100 and the BS 200 can be reduced.

[Other Embodiments]
Although the contents of the present application have been described by using the above-described embodiments, it should not be understood that the descriptions and drawings constituting a part of this disclosure limit the contents of the present application. From this disclosure, various alternative embodiments, examples and operational techniques will be apparent to those skilled in the art.

The contents according to the above-described embodiments may be executed in combination as appropriate. In addition, in each sequence described above, not all operations are necessarily essential. For example, only a part of the operations may be executed in each sequence.

Although not particularly mentioned in the above-described embodiment, a program for causing a computer to execute each process performed by any of the above-described nodes (UE 100, BS 200, etc.) may be provided. The program may be recorded on a computer readable medium. If a computer-readable medium is used, a program can be installed in the computer. Here, the computer-readable medium on which the program is recorded may be a non-transitory recording medium. The non-transitory recording medium is not particularly limited, but may be a recording medium such as a CD-ROM or a DVD-ROM.

A chip configured by a memory that stores a program for executing each process performed by either the UE 100 or the BS 200 and a processor that executes the program stored in the memory may be provided.

In the above-described embodiment, the LTE system has been described as an example of the mobile communication system, but the present invention is not limited to the LTE system, and the content according to the present application may be applied to a system other than the LTE system. For example, the content according to the present application may be applied to a communication system in 5G.

The entire content of Japanese Patent Application No. 2017-018171 (filed on Feb. 3, 2017) is incorporated herein by reference.

This disclosure is useful in the mobile communication field.

Claims

A wireless terminal,
A receiver,
A controller, and
The receiver is configured to receive measurement configuration information from a base station;
The measurement setting information includes identification information for identifying an association between a plurality of criteria and a measurement object for triggering a measurement report,
The wireless terminal configured to report a measurement result of the measurement object associated with the plurality of criteria to the base station based on the plurality of criteria specified by the identification information.
The wireless terminal according to claim 1, wherein the controller is configured to report the measurement result to the base station in response to all of the plurality of criteria being satisfied.
The wireless terminal according to claim 1, wherein the measurement setting information includes an identifier for identifying whether an established condition for the plurality of trigger criteria is an AND condition or an OR condition.
The wireless terminal according to claim 1, wherein the measurement setting information includes information indicating a predetermined standard added to the plurality of standards.
The measurement configuration information includes time information indicating a time until a criterion for triggering the measurement report is satisfied,
The wireless terminal according to claim 1, wherein the time information is a value common to the plurality of criteria.
The measurement configuration information includes time information indicating a time until a criterion for triggering the measurement report is satisfied,
The wireless terminal according to claim 1, wherein each of the plurality of criteria is associated with the time information.
The plurality of criteria includes a first criterion relating only to radio signals from the first cell and a second criterion relating to radio signals from the second cell;
The wireless terminal of claim 1, wherein the controller is configured to initiate an evaluation for the second criterion in response to the first criterion being satisfied.
2. The wireless terminal according to claim 1, wherein the controller is configured to sequentially perform evaluations as to whether the plurality of criteria are satisfied without simultaneously performing evaluations as to whether the plurality of criteria are satisfied. .
The wireless terminal according to claim 8, wherein the controller is configured to report the measurement result to the base station in response to each of the plurality of criteria being continuously satisfied.
The wireless terminal according to claim 1, wherein the controller is configured to report the measurement result of the measurement object associated with the plurality of criteria by the identification information in one message.
A processor for controlling a wireless terminal,
Execute processing to receive measurement setting information from the base station,
The measurement setting information includes identification information for identifying an association between a plurality of criteria and a measurement object for triggering a measurement report,
A processor that executes processing for reporting a measurement result of the measurement object associated with the plurality of criteria to the base station based on the plurality of criteria specified by the identification information.
A base station,
A controller,
A transmitter,
And a receiver,
The controller is configured to include, in the measurement setting information, identification information for identifying an association between a plurality of criteria and a measurement object for triggering a measurement report,
The transmitter is configured to transmit the measurement configuration information to a wireless terminal;
The receiver is configured to receive a report of measurement results based on the plurality of criteria identified by the identification information from the wireless terminal;
The measurement result is a base station that is a measurement result for the measurement object associated with the plurality of criteria.