JP7390149B2 - Terminal device, base station device, method, and integrated circuit - Google Patents

Description

The present invention relates to a terminal device, a base station device, a method, and an integrated circuit.

Radio access systems and radio networks for cellular mobile communications (hereinafter referred to as "Long Term Evolution (LTE: registered trademark)" or "Evolved Universal Terrestrial Radio Access: EUTRA"), and core networks (hereinafter referred to as "Evolved "Packet Core: EPC") is being considered in the 3rd Generation Partnership Project (3GPP).

In addition, 3GPP is conducting technical studies on LTE-Advanced Pro, which is an extension technology of LTE, and NR (New Radio technology), which is a new radio access technology, as a radio access method and radio network technology for the fifth generation cellular system. and standards are being formulated (Non-Patent Document 1). Further, 5 Generation Core Network (5GC), which is a core network for the 5th generation cellular system, is also being studied (Non-Patent Document 2).

3GPP RP-170855, “Work Item on New Radio (NR) Access Technology” 3GPP TS 23.501 v15.6.0, “System Architecture for the 5G System; Stage 2” 3GPP TS 36.300, v15.6.0, “Evolved Universal Terrestrial Radio Access (E-UTRA) and Evolved Universal Terestrial Radio Access N etwork (E-UTRAN); Overall description; Stage 2” 3GPP TS 36.331 v15.6.0, “Evolved Universal Tertrial Radio Access (E-UTRA); Radio Resource Control (RRC); Protocol specific ions” 3GPP TS 36.323 v15.4.0, “Evolved Universal Tertrial Radio Access (E-UTRA); Packet Data Convergence Protocol (PDCP) specific ation” 3GPP TS 36.322 V15.2.0, “Evolvered Universal Terry Radio ACCESS (E -UTRA); RADIO LINK CONTROL (RLC) PROTOCOL SPECIFICATI ON " 3GPP TS 36.321 v15.6.0, “Evolved Universal Tertrial Radio Access (E-UTRA); Medium Access Control (MAC) protocol specific on” 3GPP TS 37.340 v15.6.0, “Evolved Universal Terrestrial Radio Access (E-UTRA) and NR; Multi-Connectivity; Stage 2” 3GPP TS 38.300 v15.6.0, “NR; NR and NG-RAN Overall description; Stage 2” 3GPP TS 38.331 v15.6.0, “NR; Radio Resource Control (RRC); Protocol specifications” 3GPP TS 38.323 v15.6.0, “NR; Packet Data Convergence Protocol (PDCP) specification” 3GPP TS 38.322 v15.5.0, “NR; Radio Link Control (RLC) protocol specification” 3GPP TS 38.321 v15.6.0, “NR; Medium Access Control (MAC) protocol specification” 3GPP TS 23.401 v15.8.0, “General Packet Radio Service (GPRS) enhancements for Evolved Universal Terrestrial Radio Access Ne twork (E-UTRAN) access” 3GPP TS 37.324 v15.1.0, “NR; Service Data Adaptation Protocol (SDAP) specification” 3GPP R2-1911317, “Support NeedForGap capability for each supported NR band before EN-DC configuration”

As one of the LTE technologies, the terminal capability (UE capability) indicates whether a gap is necessary for measurement between frequencies (Inter-Frequency) and/or between radio access technologies (Inter-RAT, RAT). ) A mechanism has been introduced to notify base station apparatuses of information for each band, but it has been assumed that a gap is always required for Inter-RAT NR, and the above notification mechanism has not been introduced. Therefore, studies are underway to introduce a mechanism that takes NR into consideration (Non-Patent Document 16).

However, the study in Non-Patent Document 16 above proposes a mechanism for notifying whether a gap is necessary or not using an existing information element in which NR band information is stored. There was a problem in that there was no mechanism proposed for the network to identify whether it is notifying the network of the network or whether it is notifying the necessity of a gap in consideration of NR. Further, the notification of the necessity of a gap in NR and the notification of the necessity of a gap in MR-DC (Multi-Radio Dual Connectivity) have not yet been specified.

One aspect of the present invention has been made in view of the above circumstances, and it is an object of the present invention to provide a terminal device, a base station device, a method, and an integrated circuit that can efficiently notify whether or not a gap is necessary for a terminal device. Make it one of the objectives.

(1) In order to achieve the above object, one embodiment of the present invention takes the following measures.
That is, a first embodiment of the present invention is a terminal device that communicates with a base station device, and which receives a radio resource control (RRC) message (UE capability information inquiry message) from the base station device to inquire about capability information. ); a transmitting unit that transmits an RRC message (UE capability information message) for notifying the base station device of capability information; a first UE capability RAT container; a second UE capability RAT container; , a controller for including part or all of a third UE capability RAT container in the UE capability information message, wherein the first UE capability RAT container includes one or more of the first radio access technologies. The second UE capability RAT container includes a first information element including band information and a fourth information element including information regarding whether or not a measurement gap is required in each band of the first information element. , a second information element including information on one or more bands of a second radio access technology, and a fifth information element including information regarding the necessity of a measurement gap in each band of the second information element. a third information element comprising a plurality of band information including both a first radio access technology and a second radio access technology; and a sixth information element including information regarding the necessity of a measurement gap in each band of the second information element.

(2) A second embodiment of the present invention is a base station device that communicates with a terminal device, the radio resource control (RRC) message (UE capability information inquiry message) for inquiring capability information to the terminal device. ); a receiving unit that receives an RRC message (UE capability information message) for notification of capability information from the terminal device; a first UE capability RAT container, a second UE capability RAT container, a second UE capability RAT container; a controller configured to obtain some or all of the three UE capability RAT containers from the UE capability information message, the first UE capability RAT container having one or more bands of the first radio access technology; a first information element containing information; and a fourth information element containing information regarding the necessity of a measurement gap in each band of the first information element; the second UE capability RAT container includes: a second information element including information on one or more bands of a second radio access technology; and a fifth information element including information regarding whether or not a measurement gap is required in each band of the second information element. and the third UE capability RAT container includes a third information element including a plurality of band information including both a first radio access technology and a second radio access technology; and information regarding whether or not a measurement gap is required in each band of the second information element.

(3) A third embodiment of the present invention is a method applied to a terminal device that communicates with a base station device, the method including a radio resource control (RRC) message for inquiring capability information from the base station device. (UE capability information inquiry message);
transmitting an RRC message (UE capability information message) for notifying capability information to the base station device; a first information element comprising one or more band information of a first radio access technology; , a fourth information element including information regarding the necessity of measurement gaps in each band of the first information element, and the second UE capability RAT container includes one of the second radio access technologies. or a second information element including information on a plurality of bands; and a fifth information element including information on whether or not a measurement gap is required in each band of the second information element, and the third UE capability RAT The container includes a third information element containing a plurality of band information including both the first radio access technology and the second radio access technology, and a third information element containing information about each band of the first information element and the second information element. and a sixth information element including information regarding whether or not a measurement gap is necessary in the measurement gap.

(4) A fourth embodiment of the present invention is a method applied to a base station device that communicates with a terminal device, the method comprising: sending a radio resource control (RRC) message ( a step of transmitting a UE capability information inquiry message); a step of receiving an RRC message for capability information notification (UE capability information message) from the terminal device; a first UE capability RAT container; retrieving some or all of a third UE capability RAT container from the UE capability information message, wherein the first UE capability RAT container includes one or more of the first radio access technologies. a first information element including band information of the first information element; and a fourth information element including information regarding the necessity of a measurement gap in each band of the first information element; a second information element containing information on one or more bands of a second radio access technology; and a fifth information element containing information regarding the necessity or non-necessity of a measurement gap in each band of the second information element. , wherein the third UE capability RAT container includes a third information element including a plurality of band information including both a first radio access technology and a second radio access technology; and a sixth information element including information regarding the necessity of a measurement gap in each band of the second information element.

(5) A fifth embodiment of the present invention is a terminal device that communicates with a base station device, the radio resource control (RRC) message (UE capability information inquiry) for inquiring capability information from the base station device. a first UE capability RAT container; a first UE capability RAT container; a first UE capability RAT container; a second UE capability RAT container, a function implemented in including a part or all of a third UE capability RAT container in the UE capability information message, is performed on the terminal device; The RAT container includes a first information element including information on one or more bands of a first radio access technology, and a fourth information element including information regarding whether or not a measurement gap is required in each band of the first information element. an information element, the second UE capability RAT container includes a second information element comprising one or more band information of a second radio access technology; and each band of the second information element. a fifth information element including information regarding the necessity of a measurement gap in the third UE capability RAT container, and the third UE capability RAT container includes a plurality of A third information element includes band information, and a sixth information element includes information regarding whether or not a measurement gap is required in each band of the first information element and the second information element.

(6) A sixth embodiment of the present invention is a base station device that communicates with a terminal device, the radio resource control (RRC) message (UE capability information inquiry message) for inquiring capability information to the terminal device. ), a function implemented in receiving an RRC message (UE capability information message) for notification of capability information from the terminal device, a first UE capability RAT container, a second UE capability RAT container, a UE capability RAT container, and a function implemented to obtain a part or all of a third UE capability RAT container from the UE capability information message, for the terminal device; a first information element containing information on one or more bands of the first radio access technology; and a fourth information element containing information regarding the necessity or non-necessity of a measurement gap in each band of the first information element. and the second UE capability RAT container includes a second information element comprising one or more band information of a second radio access technology, and measurements in each band of the second information element. a fifth information element including information regarding whether or not a gap is necessary, and the third UE capability RAT container includes a plurality of band information including both a first radio access technology and a second radio access technology. and a sixth information element including information regarding the necessity of a measurement gap in each band of the first information element and the second information element.

Note that these comprehensive or specific aspects may be realized by a system, an apparatus, a method, an integrated circuit, a computer program, or a recording medium. It may be realized by any combination of the following.

According to one aspect of the present invention, a terminal device can efficiently notify whether a gap is necessary or not based on optimal parameter settings.

1 is a schematic diagram of a communication system according to an embodiment of the present invention. FIG. 2 is a protocol stack diagram of UP and CP of a terminal device and a base station device in E-UTRA in an embodiment of the present invention. FIG. 4 is a protocol stack diagram of UP and CP of a terminal device and a base station device in NR in an embodiment of the present invention. FIG. 1 is a block diagram showing the configuration of a terminal device in an embodiment of the present invention. FIG. 1 is a block diagram showing the configuration of a base station device in an embodiment of the present invention. FIG. 3 is a diagram illustrating an example of a flow of LTE UE capability transfer processing in an embodiment of the present invention. An ASN indicating an LTE UE Capability Information (UE Capability Information) message in an embodiment of the present invention. FIG. 1 is a diagram showing an example of one description. FIG. 3 is a diagram showing an example of a flow of UE capability transfer processing by an NR in an embodiment of the present invention. An ASN.ASN indicating a UE Capability Information (UE Capability Information) message of an NR in an embodiment of the present invention. FIG. 1 is a diagram showing an example of one description. ASN. which indicates the UE-EUTRA-Capability information element in the embodiment of the present invention. FIG. 1 is a diagram showing an example of one description. ASN. FIG. 1 is a diagram showing an example of one description. ASN.ASN.BandCombinationParameters information element in the embodiment of the present invention. FIG. 1 is a diagram showing an example of one description. ASN.MeasParameters information element in the embodiment of this invention. FIG. 1 is a diagram showing an example of one description. ASN.ASN.ASN indicating the UE-NR-Capability information element in the embodiment of the present invention. FIG. 1 is a diagram showing an example of one description. ASN. FIG. 1 is a diagram showing an example of one description. ASN. which indicates the UE-MRDC-Capability information element in the embodiment of the present invention. FIG. 1 is a diagram showing an example of one description. An ASN.ASN that indicates the UE-EUTRA-Capability information element considering NR in the embodiment of the present invention. FIG. 1 is a diagram showing an example of one description. The ASN.ASN.bandInfoEUTRA information element in the embodiment of this invention. FIG. 1 is a diagram showing an example of one description. The ASN.ASN.bandInfoNR information element in the embodiment of the present invention. FIG. 1 is a diagram showing an example of one description. ASN.bandInfo indicating the MRDC information element in the embodiment of the present invention. FIG. 1 is a diagram showing an example of one description.

Embodiments of the present invention will be described in detail below with reference to the drawings.

LTE (and LTE-A Pro) and NR may be defined as different RATs. Furthermore, LTE that can be connected to NR with Multi RAT Dual connectivity may be distinguished from conventional LTE. Further, LTE whose core network is 5GC may be distinguished from conventional LTE whose core network is EPC. This embodiment may be applied to NR, LTE and other RATs. The following description uses terms related to LTE and NR, but may be applied in other technologies using other terms. Further, the term E-UTRA in this embodiment may be replaced with the term LTE, and the term LTE may be replaced with the term E-UTRA.

FIG. 1 is a schematic diagram of a communication system according to each embodiment of the present invention.

The E-UTRA 100 is a radio access technology described in Non-Patent Document 3, etc., and is composed of a cell group (CG) made up of one or more frequency bands. The eNB (E-UTRAN Node B) 102 is a base station device of the E-UTRA 100. EPC (Evolved Packet Core) 104 is a core network described in Non-Patent Document 14 and the like, and was designed as a core network for E-UTRA 100. The interface 112 is an interface between the eNB 102 and the EPC 104, and includes a control plane (CP) through which control signals pass and a user plane (UP) through which user data passes.

NR106 is a radio access technology described in Non-Patent Document 9 and the like, and is made up of a cell group (CG) made up of one or more frequency bands. gNB (g Node B) 108 is a base station device of NR 106. The 5GC 110 is a core network described in Non-Patent Document 2, and is designed as a core network for the NR 106, but may also be used as a core network for the E-UTRA 100 that has the function of connecting to the 5GC 110. Hereinafter, the E-UTRA 100 may include an E-UTRA 100 having a function of connecting to the 5GC 110.

Interface 114 is an interface between eNB 102 and 5GC 110, interface 116 is an interface between gNB 108 and 5GC 110, interface 118 is an interface between gNB 108 and EPC 104, and interface 120 is an interface between eNB 102 and gNB 108. Face 124 is EPC104 and 5GC110 It is an interface between The interfaces 114, 116, 118, 120, 124, etc. may be interfaces that pass only the CP, only the UP, or both the CP and the UP. Further, the interface 114, the interface 116, the interface 118, the interface 120, the interface 124, etc. may not exist depending on the communication system provided by the communication carrier.

UE 122 is a terminal device that is compatible with E-UTRA 100, NR 106, or both E-UTRA 100 and NR 106. As described in Non-Patent Document 3 and/or Non-Patent Document 9, when the UE 122 connects to the core network via the E-UTRA 100 and/or the NR 106, the UE 122, the E-UTRA 100, and/or a logical path called a radio bearer (RB) is established between the NR 106 and the NR 106. The radio bearer used for CP is called a signaling radio bearer (SRB), and the radio bearer used for UP is called a data radio bearer (DRB Data Radio Bearer). Each RB is assigned an RB identifier (RB Identity, or RB ID) and is uniquely identified. The RB identifier for SRB is called an SRB identifier (SRB Identity, or SRB ID), and the RB identifier for DRB is called a DRB identifier (DRB Identity, or DRB ID).

As described in Non-Patent Document 3, when the core network to which the UE 122 is connected is the EPC 104, each DRB established between the UE 122 and the E-UTRA 100 and/or the NR 106 is further connected to each DRB that passes through the EPC 104. It is uniquely linked to an EPS (Evolved Packet System) bearer. Each EPS bearer is assigned an EPS bearer identifier (Identity, or ID) and is uniquely identified. Furthermore, the same QoS is guaranteed for data passing through the same EPS bearer.

As described in Non-Patent Document 9, when the core network to which the UE 122 is connected is the 5GC 110, one or more DRBs established between the UE 122, the E-UTRA 100, and/or the NR 106 are further connected to the 5GC 110. PDU (Packet Data
Unit) is linked to one of the sessions. Each PDU session has one or more QoS flows. Each DRB may be mapped to one or more QoS flows existing in the associated PDU session, or may not be mapped to any QoS flow. Each PDU session is identified by a PDU session identifier (Identity, or ID). Each QoS flow is also identified by a QoS flow identifier. Furthermore, the same QoS is guaranteed for data passing through the same QoS flow.

There are no PDU sessions and/or QoS flows in the EPC 104 and no EPS bearers in the 5GC 110. In other words, when the UE 122 is connected to the EPC 104, the UE 122 has EPS bearer information, and when the UE 122 is connected to the 5GC 110, the UE 122 has information about the PDU session and/or QoS flow.

FIG. 2 is a protocol stack diagram of the UP and CP of the terminal device and the base station device in the E-UTRA radio access layer in each embodiment of the present invention.

FIG. 2(A) is a protocol stack diagram of the UP used when the UE 122 communicates with the eNB 102 in the E-UTRA 100.

A PHY (Physical layer) 200 is a wireless physical layer, and provides a transmission service to an upper layer using a physical channel. The PHY200 is a higher-level MAC (Medium), which will be described later.
It is connected to the Access Control layer 202 via a transport channel. Data moves between the MAC 202 and the PHY 200 via the transport channel. Data is transmitted and received between the PHY of the UE 122 and the eNB 102 via a wireless physical channel.

The MAC 202 is a medium access control layer that maps various logical channels to various transport channels. The MAC 202 is connected to a higher-level RLC (Radio Link Control layer) 204, which will be described later, through a logical channel. Logical channels are broadly classified according to the type of information to be transmitted, and are divided into control channels that transmit control information and traffic channels that transmit user information. The MAC 202 has functions such as a function to control the PHY 200 to perform intermittent reception and transmission (DRX/DTX), a function to execute a random access procedure, a function to notify information on transmission power, a function to perform HARQ control, etc. (Non-patent Document 7).

The RLC 204 uses upper-level PDCP (Packet Data Convergence) which will be described later.
ence Protocol Layer) 206 and adjusts the data size so that the lower layer can appropriately transmit the data. It is. The RLC 200 also has a function to guarantee the QoS (Quality of Service) required by each piece of data. That is, the RLC 204 has functions such as data retransmission control (Non-Patent Document 6).

The PDCP 206 is a packet data convergence protocol layer (packet data convergence protocol layer) for efficiently transmitting IP packets, which are user data, over a wireless section. The PDCP 206 may have a header compression function that compresses unnecessary control information. Furthermore, the PDCP 206 may also have a data encryption function (Non-Patent Document 5).

Note that the data processed in the MAC 202, RLC 204, and PDCP 206 are respectively referred to as MAC PDU (Protocol Data Unit), RLC PDU, and PDCP PDU. Furthermore, data passed from the upper layer to the MAC 202, RLC 204, and PDCP 206, or data passed to the upper layer, are respectively referred to as MAC SDU (Service Data Unit), RLC SDU, and PDCP SDU.

FIG. 2(B) is a protocol stack diagram of the CP used when the UE 122 communicates with the eNB 102 and the MME (Mobility Management Entity), which is a logical node that provides functions such as authentication and mobility management, in the E-UTRA 100. .

In addition to PHY 200, MAC 202, RLC 204, and PDCP 206, the CP protocol stack includes RRC (Radio Resource Control layer) 208 and NAS (non Access Strarum) 210. The RRC 208 performs processes such as establishing, re-establishing, suspending, and resuming RRC connections, and resetting RRC connections, such as radio bearer (RB) and cell group. The radio link control layer (radio link control layer), which performs settings such as establishment, modification, and release, and controls logical channels, transport channels, and physical channels, as well as handover and measurement layer). The RB may be divided into a signaling radio bearer (SRB) and a data radio bearer (DRB), and the SRB is used as a path for transmitting an RRC message that is control information. It's okay. The DRB may be used as a path for transmitting user data. Each RB may be configured between the eNB 102 and the RRC 208 of the UE 122. Further, a portion of the RB that includes the RLC 204 and the MAC 202 may be called an RLC bearer (Non-Patent Document 4). In addition, for the NAS layer that carries signals between the MME and the UE 122, some or all of the layers of the PHY 200, MAC 202, RLC 204, PDCP 206, and RRC 208 that carry the signals between the UE 122 and the eNB 102 are set to AS (Access). It may be called the Strarum layer.

The functional classification of the MAC 202, RLC 204, PDCP 206, and RRC 208 described above is an example, and some or all of the functions may not be implemented. Further, part or all of the functions of each layer may be included in other layers.

Note that the IP layer, the TCP (Transmission Control Protocol) layer above the IP layer, and the UDP (User Datagram Pr
The PDCP layer is a layer above the PDCP layer (not shown). Further, the RRC layer and the NAS (non-access strum) layer are also upper layers of the SDAP layer (not shown). In other words, the PDCP layer is a layer below the RRC layer, NAS layer, IP layer, TCP (Transmission Control Protocol) layer above the IP layer, UDP (User Datagram Protocol) layer, and application layer.

FIG. 3 is a protocol stack diagram of the UP and CP of the terminal device and the base station device in the NR radio access layer in each embodiment of the present invention.

FIG. 3(A) is a protocol stack diagram of the UP used when the UE 122 communicates with the gNB 108 in the NR 106.

A PHY (Physical layer) 300 is a wireless physical layer of NR, and may provide a transmission service to an upper layer using a physical channel. The PHY 300 may be connected to a higher-level MAC (Medium Access Control layer) 302, which will be described later, via a transport channel. Data may be moved between MAC 302 and PHY 300 via a transport channel. Data may be transmitted and received between the PHY of the UE 122 and the gNB 108 via a wireless physical channel.

The MAC 302 is a medium access control layer that maps various logical channels to various transport channels. The MAC 302 may be connected to a higher-level RLC (Radio Link Control layer) 304, which will be described later, through a logical channel. Logical channels are broadly classified according to the type of information to be transmitted, and may be divided into control channels that transmit control information and traffic channels that transmit user information. The MAC 302 has a function of controlling the PHY 300 to perform intermittent reception and transmission (DRX/DTX), a function of executing a random access procedure, a function of notifying information on transmission power, a function of performing HARQ control, etc. (Non-patent Document 13).

The RLC 304 performs radio link control to segment data received from the upper PDCP (Packet Data Convergence Protocol Layer) 206 (described later) and adjusts the data size so that the lower layer can appropriately transmit the data. layer (radio link control layer). Further, the RLC 304 may also have a function to guarantee QoS (Quality of Service) required by each data. That is, the RLC 304 may have a function such as data retransmission control (Non-Patent Document 12).

The PDCP 306 is a packet data convergence protocol layer (packet data convergence protocol layer) that efficiently transmits IP packets, which are user data, in a wireless section. The PDCP 306 may have a header compression function that compresses unnecessary control information. Furthermore, the PDCP 306 may also have a data encryption function (Non-Patent Document 11).

SDAP (Service Data Adaptation Protocol) 310 maps the downlink QoS flow sent from the 5GC 110 to the terminal device via the base station device and the DRB, and the mapping from the terminal device to the terminal device via the base station device. This is a service data adaptation protocol layer (service data adaptation protocol layer) that has a function of mapping an uplink QoS flow sent to the 5GC 110 and a DRB and storing mapping rule information (Non-Patent Document 15).

FIG. 3B shows that in the NR 106, the UE 122 connects to the gNB 108 and the AMF (Access and
FIG. 2 is a protocol stack diagram of a CP used when communicating with a mobility management function.

In addition to PHY 300, MAC 302, RLC 304, and PDCP 306, the CP protocol stack includes RRC (Radio Resource Control layer) 308 and NAS (non Access Strarum) 312. The RRC 308 performs processes such as establishing, re-establishing, suspending, and resuming RRC connections, and resetting RRC connections, such as radio bearer (RB) and cell group. The radio link control layer (radio link control layer), which performs settings such as establishment, modification, and release, and controls logical channels, transport channels, and physical channels, as well as handover and measurement layer). The RB may be divided into a signaling radio bearer (SRB) and a data radio bearer (DRB), and the SRB is used as a path for transmitting an RRC message that is control information. It's okay. The DRB may be used as a path for transmitting user data. Each RB may be configured between the gNB 108 and the RRC 308 of the UE 122. Further, a portion of the RB that includes the RLC 304 and the MAC 302 may be called an RLC bearer (Non-Patent Document 10). In addition, for the NAS layer that carries signals between the AMF and the UE 122, some or all of the layers of the PHY 200, MAC 202, RLC 204, PDCP 206, and RRC 208 that carry the signals between the UE 122 and the gNB 108 are set to AS (Access). It may be called the Strarum layer.

The functional classification of the MAC 302, RLC 304, PDCP 306, SDAP 310, and RRC 308 described above is an example, and some or all of the functions may not be implemented. Moreover, a part or all of the functions of each layer (each layer) may be included in another layer (layer).

Note that each layer configured in a terminal device and/or a base station device may be referred to as an entity. That is, the MAC layer, RLC layer, PDCP layer, SDAP layer, and RRC layer configured in the terminal device and/or base station device are referred to as MAC entity, RLC entity, PDCP entity, SDAP entity, and RRC entity. You can call them respectively.

In each embodiment of the present invention, in order to distinguish between the E-UTRA protocol and the NR protocol, the MAC 202, RLC 204, PDCP 206, and RRC 208 are respectively referred to as MAC for E-UTRA, MAC for LTE, and E-UTRA. It is also called RLC for E-UTRA or RLC for LTE, PDCP for E-UTRA or PDCP for LTE, and RRC for E-UTRA or RRC for LTE. Furthermore, the MAC 302, RLC 304, PDCP 306, and RRC 308 may be referred to as NR MAC, NR RLC, NR RLC, and NR RRC, respectively. Alternatively, it may be written as E-UTRA PDCP, LTE PDCP, NR PDCP, etc. using spaces.

Further, as shown in FIG. 1, the eNB 102, gNB 108, EPC 104, and 5GC 110 may be connected via interface 112, interface 116, interface 118, interface 120, and interface 114. Therefore, in order to support various communication systems, the RRC 208 in FIG. 2 may be replaced with the RRC 308 in FIG. 3. Also, the PDCP 206 in FIG. 2 may be replaced with the PDCP 306 in FIG. 3. Further, the RRC 308 in FIG. 3 may include the functions of the RRC 208 in FIG. 2. Further, the PDCP 306 in FIG. 3 may be the PDCP 206 in FIG. 2. Furthermore, in the E-UTRA 100, NR PDCP may be used as the PDCP even when the UE 122 communicates with the eNB 102.

When a terminal device (UE 122) can communicate with a certain base station device (eNB 102 and/or gNB 108), among the cells of that base station device, a cell configured to be used for communication with the terminal device is selected. A serving cell may be referred to as a serving cell, and a cell that is not used for other communications may be referred to as a neighboring cell. Further, part or all of the system information required in the serving cell may be broadcast or notified to the terminal device in another cell.

One or more serving cells are configured for the terminal device. When multiple serving cells are configured for a terminal device, the configured multiple serving cells may include one primary cell and one or more secondary cells. The primary cell may be the serving cell on which the initial connection establishment procedure was performed, the serving cell that initiated the connection re-establishment procedure, or the cell designated as the primary cell in the handover procedure. . One or more secondary cells may be configured at the time the RRC (Radio Resource Control) connection is established or after the RRC connection is established. There are also cell groups (also referred to as master cell groups (MCGs)) consisting of one or more serving cells that include a primary cell (PCell), and one or more serving cells that do not include a primary cell but include a primary secondary cell (PSCell). One or more cell groups (also referred to as secondary cell groups (SCG)) configured with a plurality of serving cells may be configured for the terminal device. The primary secondary cell may be capable of performing random access procedures. The primary secondary cell may be a cell that does not become inactive. A master cell group may include one primary cell and zero or more secondary cells. A secondary cell group may include one primary secondary cell and zero or more secondary cells. Either or both of the MCG and the SCG may be a cell group composed of LTE cells. Either or both of the MCG and the SCG may be a cell group composed of NR cells.

When the core network is EPC 104 and the MCG base station is eNB 102, a connection in which MCG is an LTE cell group and SCG is an NR cell group may be referred to as EN-DC (E-UTRA-NR Dual Connectivity). . When the core network is 5GC110 and the master node is eNB102 (also referred to as extended eNB102), the connection where MCG is an LTE cell group and SCG is an NR cell group is connected to NGEN-DC (NG-RAN E-UTRA- NR Dual Connectivity).

Dual Connectivity using multiple radio access technologies (RATs) including EN-DC and NGEN-DC may be generally referred to as MR-DC (Multi-RAT Dual Connectivity, or Multi-Radio Dual Connectivity). The MR-DC may include an NR-DC in which the MCG is an NR cell group and the SCG is an NR cell group. The MR-DC may not include an NR-DC in which the MCG is a cell group of NR and the SCG is a cell group of NR. For example, UE capability information regarding MR-DC may not include information on NR-DC.

In the downlink, a carrier corresponding to a serving cell may be referred to as a downlink component carrier (or downlink carrier). In the uplink, a carrier corresponding to a serving cell may be referred to as an uplink component carrier (or uplink carrier).

An example of UE capability transfer in LTE will be described using FIGS. 6 and 7. Note that although the UE capability information message described below includes various information elements, only the information elements related to this embodiment will be described. That is, the UE capability information message may include information elements other than those shown in FIG. 7. Furthermore, the hierarchical structure of information elements included in the UE capability information message in the following description is just an example, and various hierarchical structures may be used.

Note that the messages and information elements used in each RRC layer, including the UE capability information message, are based on ASN. 1 (Abstract Syntax Notation One). Each message and each information element includes one or more fields and values for the fields. Values for fields can take (have) values of various types, and can also take information elements as values.

In FIG. 6, the base station device (eNB 102) transmits a UE capability inquiry message to the terminal device (UE 122) (step S61). The terminal device that has received the UE capability inquiry message (UECapabilityEnquiry) sets content in a UE capability information message (UECapabilityInformation) and submits it to the lower layer of the terminal device (step S62). The lower layer of the terminal device may transmit the UE capability information to the base station device (step S63).

In step S61, the base station device (eNB 102) may include information specifying which RAT type of UE capability is to be notified to the terminal device in the UE capability inquiry message.

In step S62, the terminal device may include a UE Capability RAT Container (ueCapabilityRAT-Container) for each RAT type in the UE capability information message, as shown in FIG. RAT types may include some or all of E-UTRA, UTRA, GERAN CS, GERAN PS, CDMA2000-1XRTT, NR, and EUTRA-NR. Further, the RAT type may include other RATs. The UE capability RAT container is octet string information, and information elements defined in specifications according to the RAT type are encoded and stored in the UE capability RAT container.

For example, when the RAT type is E-UTRA, the UE-EUTRA-Capability information element defined in Non-Patent Document 4 is encoded and stored in the UE capability RAT container. Further, for example, when the RAT type is NR, the UE-NR-Capability information element defined in Non-Patent Document 10 is encoded and stored in the UE capability RAT container. Further, for example, when the RAT type is EUTRA-NR, the UE-MRDC-Capability information element defined in Non-Patent Document 10 is encoded and stored in the UE capability RAT container.

An example of the NR RRC reconfiguration message will be described using FIGS. 8 and 9. Note that although the RRC reconfiguration message described below includes various information elements, only the information elements related to this embodiment will be described. That is, the RRC reconfiguration message may include information elements other than the information elements shown in FIG. Furthermore, the hierarchical structure of information elements included in the UE capability information message in the following description is just an example, and various hierarchical structures may be used.

In FIG. 8, the base station device (gNB108) transmits a UE capability inquiry message to the terminal device (UE122) (step S81). The terminal device that has received the UE capability inquiry message sets the content in the UE capability information message and submits it to the lower layer of the terminal device (step S82). The lower layer of the terminal device may transmit the UE capability information to the base station device (step S83).

In step S81, the base station device (gNB 108) may include information specifying which RAT type of UE capability is to be notified to the terminal device in the UE capability inquiry message.

In step S82, the terminal device may include a UE Capability RAT container (ueCapabilityRAT-Container) for each RAT type in the UE capability information message. The RAT type may include some or all of E-UTRA, NR, and EUTRA-NR. Further, the RAT type may include other RATs. The UE capability RAT container is octet string information, and information elements defined in specifications according to the RAT type are encoded and stored in the UE capability RAT container.

For example, if the RAT type is E-UTRA, the UE-EUTRA-Capability information element defined in Non-Patent Document 4 may be encoded and stored in the UE Capability RAT container. Further, for example, when the RAT type is NR, the UE-NR-Capability information element defined in Non-Patent Document 10 may be encoded and stored in the UE capability RAT container. Further, for example, when the RAT type is EUTRA-NR, the UE-MRDC-Capability information element defined in Non-Patent Document 10 may be encoded and stored in the UE capability RAT container.

The UE-EUTRA-Capability information element will be explained using FIGS. 10 to 13. Note that although the UE-EUTRA-Capability information element is an information element that has a hierarchical structure that is expanded based on releases and versions, a simplified hierarchical structure will be used below for ease of explanation. That is, each information element used in the following description may actually be placed at various locations within the layered UE-EUTRA-Capability information element. In addition, character strings derived from the release or version (for example, "-r15" or "-v1530") may be added to the actual field name of each information element, but these descriptions will not be used in the following explanation. May be omitted.

The UE-EUTRA-Capability information element includes (A) an accessStrumRelease field indicating AS release information, (B) an rf-Parameters field containing capability information regarding RF, (C) a measParameters field containing capability information regarding measurement, (D ) An interRAT-Parameters field containing capability information about a RAT other than NR different from EUTRA, and (E) an irat-ParametersNR field containing capability information about NR. Some or all of the fields may be included. The UE-EUTRA-Capability information element may include one or more other fields.

The accessStratumRelease field is
It may have the value mRelease information element. The AccessStratumRelease information element may take any value of an enumerated type having an enumerator such as "rel8", "rel9", "rel10", etc. indicating release information.

As shown in FIG. 10, the rf-Parameters field may have an RF-Parameters information element as a value. As shown in FIG. 11, the RF-Parameters information element includes (A) a supportedBandListEUTRA field indicating information about bands supported by the terminal device, and (B) a supportedBandCombination field indicating information about the combination of bands supported by the terminal device. It's fine.

The supportedBandListEUTRA field may have one or more BandEUTRA information elements as values depending on the number of bands supported by the terminal device. Each BandEUTRA information element may include information indicating a frequency band (operating band (also simply referred to as band)) of EUTRA.

The supportedBandCombination field may have a SupportedBandCombination information element as its value. Further, the RF-Parameters information element may include a supportedBandCombinationAdd field that can additionally indicate a band combination when the maximum value of band combinations that can be indicated in the supportedBandCombination field is exceeded. Furthermore, if the UE capability inquiry message received from the base station device includes a specific field (requestReducedFormat) whose value is true, the RF-Parameters information element includes the supportedBandCombination field instead of the supportedBandCombination field. nationReduced Fields may also be used.

The supportedBandCombination field may have one or more BandCombinationParameters-r10 information elements as values, depending on the number of band combinations and the various parameters applied in that combination. The supportedBandCombinationAdd field may have one or more BandCombinationParameters-r11 information elements as values, depending on the number of band combinations and the various parameters applied in the combinations. The supportedBandCombinationReduced field may have one or more BandCombinationParameters-r13 information elements as values, depending on the number of band combinations and the various parameters applied in the combinations. Note that in the following description, the "number of band combinations and various parameters applied to the combinations" may be simply referred to as "band combinations."

As shown in FIG. 12, the BandCombinationParameters-r10 information element may have as a value one or more information elements (BandParameters information element) that indicate information about each band in one band combination. For example, if there is one band in a certain band combination, the BandCombinationParameters-r10 information element has one BandParameters information element as a value. Further, for example, if there are two bands in a certain band combination, the BandCombinationParameters-r10 information element has two BandParameters information elements as values. Each BandParameters information element includes information indicating the EUTRA frequency band (operating band).

As shown in FIG. 12, the BandCombinationParameters-r11 information element may include a field (bandParameterList field) indicating information about each band in one band combination. Furthermore, the BandCombinationParameters-r11 information element may include a field (bandInfoEUTRA field) indicating information regarding the necessity of a measurement gap, which will be described later. The bandParameterList field may have as a value a number of BandParameters information elements corresponding to the number of bands to be combined. Each BandParameters information element includes information indicating the EUTRA frequency band (operating band).

As shown in FIG. 12, the BandCombinationParameters-r13 information element may include a field (bandParameterList field) indicating information about each band in one band combination. Furthermore, the BandCombinationParameters-r13 information element may include a field (bandInfoEUTRA field) indicating information regarding the necessity of a measurement gap, which will be described later. The bandParameterList field may have as a value a number of BandParameters information elements corresponding to the number of bands to be combined. Each BandParameters information element includes information indicating the EUTRA frequency band (operating band).

A field (bandInfoEUTRA field) indicating information regarding the necessity of a measurement gap may have a BandInfoEUTRA information element, which will be described later, as a value.

As shown in FIG. 13, the measParameters field may have a MeasParameters information element as a value. The MeasParameters information element is a field (bandCo mbinationListEUTRA field) .

As shown in FIG. 10, the interRAT-Parameters field includes (A) utraFDD, (B) utraTDD128, (C) utraTDD384, (D) utraTDD768, (E) geran, (F) cdma2000-HRPD, (G) cdma2000- It may consist of some or all of the fields of 1xRTT. Each field may include a list of information regarding the bands of the corresponding RAT.

As shown in FIG. 10, the irat-ParametersNR field may have an Irat-ParametersNR information element as a value. The Irat-ParametersNR information element is (A) supportedBandListEN-DC-r15 whose value is a list of information about bands of NR supported by EN-DC (SupportedBandListNR-r15), (B) supported in standalone operation of NR. may include some or all of the fields of supportedBandListNR-SA-r15, which has as a value a list of information on NR bands (SupportedBandListNR-r15). The Irat-ParametersNR information element may include one or more other fields.

The BandInfoEUTRA information element allows the terminal device to perform inter-frequency measurement (Inter-F
The information may include information (NeedForGaps field) indicating whether a measurement gap is required in each band supported by the terminal device in order to perform Inter-RAT measurements (requency measurements) and/or inter-RAT measurements (Inter-RAT measurements). The NeedForGaps field may have a value of type BOOLEAN. For example, a value of TRUE in the NeedForGaps field may indicate that a measurement gap is required, and a value of FALSE may indicate that a measurement gap is not required.

For example, as shown in FIG. 18, the interFreqBandList field included in the BandInfoEUTRA information element indicates whether a measurement gap is required in each band supported by the terminal device in order to perform inter-frequency measurements. (interFreqNeedForGaps field) may be indicated. In addition, the interRAT-BandList field included in the BandInfoEUTRA information element contains information (interRAT -NeedForGaps field).

Inter-Frequency Measurements in EUTRA means measuring a frequency in EUTRA that is different from the downlink carrier frequency of any serving cell. Furthermore, inter-RAT measurements in EUTRA means performing downlink measurements of a RAT different from EUTRA (eg, UTRA, GERAN, NR, etc.). The measurement gap is a period during which it can be considered that uplink transmission from the terminal device to the base station device and downlink transmission from the base station device to the terminal device are not scheduled. A terminal device configured with a measurement gap may perform measurements during the measurement gap period. For each combination of bands in which a serving cell can be configured, the terminal device determines whether a measurement gap is required for the measurement of each EUTRA band for inter-frequency measurement in that combination and/or whether a measurement gap is required between the RATs. The UE-EUTRA-Capability information element includes information as to whether a measurement gap is required for measurement of each band of a RAT other than EUTRA (excluding NR) for measurement.

For example, a certain terminal device uses EUTRA bandEUTRA#1 (operating band 1), bandEUTRA#2, bandEUTRA#3, bandEUTRA#4, NR bandNR#1 (operating band 1), bandNR#2, bandNR#3, UTRA. Assume that FDD band I and band II are supported.

In the supportedBandListEUTRA field, information regarding bandEUTRA#1, bandEUTRA#2, bandEUTRA#3, and bandEUTRA#4 is set as a value. Information regarding bandNR#2 and bandNR#3 is set as a value in the irat-ParametersNR field. Information regarding bandI and bandII of the UTRA FDD is set as a value in the interRAT-Parameters field.

If the terminal device supports the combination of bandEUTRA#2 and bandEUTRA#3 as the serving cell band, the BandCombinationParameters-r10 information element includes the BandParameters information element of bandEUTRA#2 and the BandPa of bandEUTRA#3. ramters information element as the value have

The terminal device requires a gap for interfrequency measurement in each band bandEUTRA#1, bandEUTRA#2, bandEUTRA#3, and bandEUTRA#4, which is indicated by the value of the supportedBandListEUTRA field in the corresponding BandInfoEUTRA information element. Include information indicating whether or not. Furthermore, if necessary, the terminal device sends information indicating whether a gap for inter-RAT measurement is required in each band I and band II of UTRA FDD, as indicated by the value of the interRAT-Parameters field, in the BandInfoEUTRA information element. Include.

The terminal device sets the BandInfoEUTRA information element for each combination of bands of the serving cell that it supports.

The UE-NR-Capability information element will be explained using FIGS. 14 and 15. Note that although the UE-NR-Capability information element is an information element that has a hierarchical structure that is expanded based on releases and versions, a simplified hierarchical structure will be used below for ease of explanation. That is, each information element used in the following description may actually be placed at various locations within the layered UE-NR-Capability information element. In addition, character strings derived from the release or version (for example, "-r15" or "-v1530") may be added to the actual field name of each information element, but these descriptions will not be used in the following explanation. May be omitted.

The UE-NR-Capability information element includes (A) an accessStratumRelease field indicating AS release information, (B) an rf-Parameters field containing capability information regarding RF, (C) measurement, radio resource management (RRM), and radio link. Some or all of the following fields may be included: a measAndMobParameters field containing capability information regarding monitoring (RLM) and mobility; and (D) an interRAT-Parameters field containing capability information regarding a RAT different from the NR. The UE-NR-Capability information element may include one or more other fields.

The accessStratumRelease field may have an AccessStratumRelease information element as a value. The AccessStratumRelease information element may take any value of an enumerated type having an enumerator such as "rel15" indicating release information.

As shown in FIG. 14, the rf-Parameters field may have an RF-Parameters information element as a value. As shown in FIG. 15, the RF-Parameters information element includes (A) a supportedBandListNR field indicating information about bands supported by the terminal device, and (B) a supportedBandCombinationList field indicating information about the combination of bands supported by the terminal device. It's fine.

The supportedBandListNR field may have one or more BandNR information elements as values depending on the number of bands supported by the terminal device. Each BandNR information element may include an NR frequency band number that is information that identifies an NR band.

The supportedBandCombinationList field may have a BandCombinationList information element as a value. The BandCombinationList information element may have multiple BandCombination information elements as values, depending on the number of band combinations and the various parameters applied in the combinations. Note that in the following description, the "number of band combinations and various parameters applied to the combinations" may be simply referred to as "band combinations."

The BandCombination information element may have as a value one or more information elements (BandParameters information element) that indicate information about each band in one band combination. For example, if there is one band in a certain combination of bands, the BandCombination information element has one BandParameters information element as a value. Further, for example, if there are two bands in a certain band combination, the BandCombination information element has two BandParameters information elements as values. Each BandParameters information element contains either information indicating the frequency band (operating band) of EUTRA or the NR frequency band number of NR, but in the UE-NR-Capability information element, only the NR frequency band number of NR is included. may be included.

As shown in FIG. 14, the interRAT-Parameters field may have an InterRAT-Parameters information element as a value. The InterRAT-Parameters information element may include an etra field whose value is a EUTRA-Parameters information element that is information about the EUTRA band. The InterRAT-Parameters information element may include fields related to one or more other RATs.

The EUTRA-Parameters information element may include a field (supportedBandListEUTRA) having one or more BandEUTRA information elements as values, depending on the number of bands supported by the terminal device. Each BandEUTRA information element may include information indicating a frequency band (operating band) of EUTRA.

The UE-MRDC-Capability information element will be explained using FIG. 16. Note that although the UE-MRDC-Capability information element is an information element that has a hierarchical structure that is expanded based on releases and versions, a simplified hierarchical structure will be used below for ease of explanation. That is, each information element used in the following description may actually be placed at various locations within the layered UE-MRDC-Capability information element. In addition, character strings derived from the release or version (for example, "-r15" or "-v1530") may be added to the actual field name of each information element, but these descriptions will not be used in the following explanation. May be omitted.

The UE-NR-Capability information element includes (A) an rf-Parameters MRDC field containing capability information regarding RF, (B) capability information regarding measurement, radio resource management (RRM), radio link monitoring (RLM), and mobility. Some or all of the measAndMobParametersMRDC fields may be included. The UE-NR-Capability information element may include one or more other fields.

The rf-ParametersMRDC field may have an RF-ParametersMRDC information element as a value. The RF-ParametersMRDC information element may include a supportedBandCombinationList field that indicates information about combinations of bands supported by the terminal device.

The supportedBandCombinationList field may have a BandCombinationList information element as a value. The BandCombinationList information element may have multiple BandCombination information elements as values, depending on the number of band combinations and the various parameters applied in the combinations. Note that in the following description, the "number of band combinations and various parameters applied to the combinations" may be simply referred to as "band combinations."

The BandCombination information element may have as a value one or more information elements (BandParameters information element) that indicate information about each band in one band combination. For example, if there is one band in a certain combination of bands, the BandCombination information element has one BandParameters information element as a value. Further, for example, if there are two bands in a certain band combination, the BandCombination information element has two BandParameters information elements as values. Each BandParameters information element may include either information indicating a frequency band (operating band) of EUTRA or an NR frequency band number of NR.

Based on the above messages and information elements, the setting of the BandInfoEUTRA information element in consideration of NR in inter-RAT measurement in EUTRA will be described.

In an embodiment, the terminal device includes information in the BandInfoEUTRA information element indicating whether a measurement gap is required for inter-RAT measurements for one or more first bands. The first band may be each band of each RAT included in the value of the interRAT-Parameters field of the UE-EUTRA-Capability information element. Furthermore, if a certain condition is met, information indicating whether a measurement gap is required for inter-RAT measurement for the NR band included in the value of the irat-ParametersNR field of the UE-EUTRA-Capability information element is added to the BandInfoEUTRA information element. may be included in The certain conditions are (A) to notify whether a measurement gap is required for the NR band, and (B) to have the ability to notify whether a measurement gap is required for the NR band. (C) if the accessStratumRelease field of the UE-EUTRA-Capability information element of the terminal device has a value indicating a specific release or a value indicating a release newer than the specific release; It may be part or all of.

At this time, in order to distinguish from existing operations that do not take certain conditions into account, for example, as shown in FIG. -The second IRAT -ParameterSnrfield (for example IRAT -PARAMETE Fields (for example, IRAT -PARAMERSNR Field), which is different from parametersnr -r15, / or / / IRAT -parameterSnr -v1540). RSNR -R16) may be introduced. At this time, the terminal device does not need to include the NeedForGaps field for the NR band indicated by the first irat-ParametersNR field in the BandInfoEUTRA information element. Also, at this time, the terminal device may include a NeedForGaps field for the NR band indicated by the second irat-ParametersNR field in the BandInfoEUTRA information element.

Further, the second irat-ParametersNR field is the supportedBandList included in the UE-NR-Capability information element shown in FIG.
It may also be an NR field.

Further, for example, the terminal device includes information on an NR band that requires a measurement gap in a first irat-ParametersNR field, and includes information on an NR band that clearly indicates whether a measurement gap is required in a second irat-ParametersNR field. may be included in Thereby, the number of bands indicating NeedForGaps can be reduced, and the message size of the UE capability information message can be reduced. Further, for example, the terminal device may include information on an NR band that requires a measurement gap in the first irat-ParametersNR field, include information on an NR band that does not require a measurement gap in the second irat-ParametersNR field, and send the BandInfoEUTRA NeedForGaps regarding the NR band may not be included in the information element. Thereby, the number of bands indicating NeedForGaps can be reduced, and the message size of the UE capability information message can be reduced.

Further, for example, it may be considered that a measurement gap is always unnecessary for a specific band (for example, Frequency Range 2: FR2). In this case, the BandInfoEUTRA information element may include a NeedForGaps field for NR bands other than FR2. Furthermore, in this case, the BandInfoEUTRA information element does not need to include the NeedForGaps field for the NR band of FR2. For example, if the second irat-ParametersNR field includes band information for both the FR2 NR band and the NR band other than FR2, the BandInfoEUTRA information element includes the NeedForGaps field for the FR2 NR band. You don't have to.

Furthermore, the terminal device may include information indicating that the BandInfoEUTRA information element includes information indicating whether a measurement gap is necessary for each NR band in the UE-EUTRA-Capability information element. Furthermore, the terminal device may determine whether information indicating whether a measurement gap is necessary for the NR band is included based on the number of NeedForGaps fields for inter-RAT measurements included in the BandInfoEUTRA information element.

In addition, the terminal device can specify the measurement gap for the NR band in the BandInfoEUTRA information element by having the accessStratumRelease field of the UE-EUTRA-Capability information element have a value indicating a specific release or a value indicating a newer release than the specific release. It may be determined whether information indicating necessity is included. Further, the terminal device may include a field indicating whether a measurement gap is necessary for the NR band in the BandInfoEUTRA information element. Thereby, it is possible to notify whether or not a measurement gap is required for inter-RAT measurement in consideration of NR.

The introduction of a BandInfoNR information element that takes into account inter-frequency and/or inter-RAT measurements in NR, based on the above messages and information elements, will now be described.

In an embodiment, the UE-NR-Capability information element may include a field (bandInfoNR field) indicating information indicating whether a measurement gap is required for inter-frequency measurements and/or inter-RAT measurements. A field (bandInfoNR field) indicating information regarding the necessity of a measurement gap may have a BandInfoNR information element as a value.

The BandInfoNR information element indicates that the terminal device performs inter-frequency measurements and/or inter-RAT measurements in the combination of bands associated with the BandInfoNR information element.
Measurements), information (NeedForGaps field) indicating whether a measurement gap is required in each band supported by the terminal device may be included. The NeedForGaps field may have a value of type BOOLEAN. For example, a value of TRUE in the NeedForGaps field may indicate that a measurement gap is required, and a value of FALSE may indicate that a measurement gap is not required.

Each band indicating whether a measurement gap is required when performing Inter-Frequency Measurements may be an NR band. For example, the NR band may be a band indicated by the supportedBandListNR field included in the UE-NR-Capability information element.

The bands indicating whether or not a measurement gap is necessary when performing inter-RAT measurements may include the EUTRA band. For example, the EUTRA band may be the band indicated by the supportedBandListEUTRA field included in the UE-EUTRA-Capability information element shown in FIG. 11. Further, for example, the EUTRA band may be the EUTRA band indicated by the interRAT-Parameters field included in the UE-NR-Capability information element shown in FIG. 14.

Inter-Frequency Measurements in NR is to measure a frequency of NR that is different from the downlink carrier frequency of any serving cell. Furthermore, inter-RAT measurements in NR means measuring the downlink frequency of a RAT (for example, EUTRA) different from NR. The measurement gap is a period during which it can be considered that uplink transmission from the terminal device to the base station device and downlink transmission from the base station device to the terminal device are not scheduled. A terminal device configured with a measurement gap may perform measurements during the measurement gap period. For each combination of bands for which a serving cell can be configured, the terminal device determines whether or not a measurement gap is required in the measurement of each band of NR for inter-frequency measurement in that combination, and/or whether a measurement gap is required between the RATs. The UE-NR-Capability information element may include information as to whether a measurement gap is required for measurement of each band of a RAT other than NR.

For example, as shown in FIG. 19, the interFreqBandList field included in the BandInfoNR information element
Information (interFreqNeedForGaps field) indicating whether a measurement gap is required in each band supported by the terminal device may be indicated. In addition, the interRAT-BandList field included in the BandInfoNR information element contains information (interRAT -NeedForGaps field).

The introduction of the BandInfo MRDC information element considering inter-frequency measurements and/or inter-RAT measurements in MR-DC, based on the above messages and information elements, will be described.

In some embodiments, the UE-MRDC-Capability information element may include a field (bandInfoMRDC field) indicating information regarding whether measurement gaps are required for measuring one or more second bands. The second band includes the UE-EUTRA-Capability information element and/or the UE-NR-Capability information element.
ty information element may be (A) a band of EUTRA, (B) a band of NR, and/or (C) a band of a RAT different from both EUTRA and NR. The bandInfoMRDC field may have a BandInfoMRDC information element as a value.

The BandInfo MRDC information element is used by a terminal device to perform inter-frequency measurements and/or inter-RAT measurements in a combination of bands associated with the BandInfo MRDC information element. may include information (NeedForGaps field) indicating whether measurement gaps are required in each band supported by the . The NeedForGaps field may have a value of type BOOLEAN. For example, a value of TRUE in the NeedForGaps field may indicate that a measurement gap is required, and a value of FALSE may indicate that a measurement gap is not required.

Each band indicating whether a measurement gap is required when performing Inter-Frequency Measurements may be a EUTRA band and an NR band. For example, the EUTRA band is the band indicated by the supportedBandListEUTRA field included in the UE-EUTRA-Capability information element shown in FIG. 11, and the NR band is the band included in the UE-NR-Capability information element shown in FIG. The band may be a band indicated by the supportedBandListNR field.

Each band indicating whether a measurement gap is required when performing Inter-RAT Measurements may be a band of a RAT excluding both the EUTRA band and the NR band. For example, the RAT band excluding the RATs in both the EUTRA band and the NR band may be the band indicated by the interRAT-Parameters field included in the UE-EUTRA-Capability information element shown in FIG. 10. Furthermore, for example, the RAT bands excluding the RATs of both the EUTRA band and the NR band are the bands shown in the interRAT-Parameters field included in the UE-EUTRA-Capability information element shown in FIG. 10, and the bands shown in FIG. It may be a band other than EUTRA indicated by the interRAT-Parameters field included in the UE-NR-Capability information element shown.

As another example, information for each band indicating whether or not a measurement gap is required to perform Inter-Frequency Measurements, and whether a measurement gap is required to perform Inter-RAT Measurements. An example is shown in which information for each band indicating whether or not is required is included in multiple fields.

For example, as shown in FIG. 20, the bandInfoMRDC information element includes information for each band indicating whether a measurement gap is required when performing Inter-Frequency Measurements in each of EUTRA and NR. , and information for each band indicating whether a measurement gap is required when performing Inter-RAT Measurements. For example, the information for each band included in the first field (interFreqBandList-EUTRA) may be information for each band of EUTRA. The information for each band included in the second field (interRATBandList-EUTRA) may be information for each band other than EUTRA. Alternatively, the information for each band included in the second field may be information for each band of RAT excluding both EUTRA and NR. Third
The information for each band included in the field (interFreqBandList-NR) may be information for each band of NR. The information for each band included in the fourth field (interRATBandList-NR) may be information for each band other than NR. Alternatively, the information for each band included in the fourth field may be information for each band of RAT excluding both NR and EUTRA.

In addition, the above ASN. 1, the field value is “SEQUENCE (SIZE
(1..N)) OF XXX” means that this field has one or more and N or less information elements XXX as values. In the figure, N is (A) maxRAT-Capabilities, (B) maxBandsNR-r15, (C) maxBands, (D) maxBandsEUTRA, (E) maxBandComb, (F) maxBandComb-r10, (G) maxBandCom. br11, (H ) maxBandComb-r13, (I) maxSimultaneousBands, (J) maxSimultaneousBands-r10, etc., where (A) is the upper limit number of information elements indicating the combination of the RAT type and its container, (B) to (D) are the upper limit numbers of information elements indicating bands, (E) to (H) are upper limit numbers of information elements indicating band combinations, and (I) and (J) are band combinations in MR-DC. The upper limit number of information elements to be displayed may be indicated.

FIG. 4 is a block diagram showing the configuration of the terminal device (UE 122) in the embodiment of the present invention. In order to avoid complicating the explanation, FIG. 4 shows only the main components closely related to the present invention.

The UE 122 shown in FIG. 4 includes a receiving unit 500 that receives a UE capability inquiry message and other RRC messages from the eNB 102, and performs processing according to various information elements (IE: Information Elements) and various conditions included in the received message. and a transmitting unit 404 that transmits a UE capability information message and other RRC messages to the eNB 102 and/or gNB 108. Further, a control section may be separately provided to control the operation of each section based on various conditions.

FIG. 5 is a block diagram showing the configuration of the base station device (eNB 102) in the embodiment of the present invention. In order to avoid complicating the explanation, FIG. 5 shows only the main components closely related to the present invention.

The eNB 102 shown in FIG. 5 includes a transmitter 500 that transmits a UE capability inquiry message and other RRC messages to the UE 122, and a transmitter 500 that creates a message including various information elements (IE: Information Element) and transmits it to the UE 122. The processing unit 502 includes a processing unit 502 that causes the processing unit 502 of the UE 122 to perform processing, and a receiving unit 504 that receives UE capability information messages and the like from the UE 122. Note that the configuration shown in FIG. 5 may be applied to the gNB 108. Further, the eNB 102 and/or the gNB 108 may separately include a control unit that controls the operation of each unit based on various conditions.

In this manner, in the embodiment of the present invention, appropriate mobility can be achieved by the UE 122 retaining or discarding settings based on the state transition conditions.

Various aspects of the terminal device (UE 122) and base station device (eNB 102 and/or gNB 108) in the embodiment of the present invention will be described.

(1) A first aspect of the present invention is a terminal device that communicates with a base station device, the radio resource control (RRC) message (UE capability information inquiry message) for inquiring capability information from the base station device. a receiving unit that receives, a transmitting unit that transmits an RRC message (UE capability information message) for notifying the base station device of capability information, a first UE capability RAT container, a second UE capability RAT container, a controller for including part or all of a third UE capability RAT container in the UE capability information message, wherein the first UE capability RAT container includes one or more bands of the first radio access technology. a first information element containing information; and a fourth information element containing information regarding the necessity of a measurement gap in each band of the first information element; the second UE capability RAT container includes: a second information element including information on one or more bands of a second radio access technology; and a fifth information element including information regarding whether or not a measurement gap is required in each band of the second information element. and the third UE capability RAT container includes a third information element including a plurality of band information including both a first radio access technology and a second radio access technology; and information regarding whether or not a measurement gap is required in each band of the second information element.

(2) A second embodiment of the present invention is a base station device that communicates with a terminal device, the radio resource control (RRC) message (UE capability information inquiry message) for inquiring capability information to the terminal device. ); a receiving unit that receives an RRC message (UE capability information message) for notification of capability information from the terminal device; a first UE capability RAT container, a second UE capability RAT container, a second UE capability RAT container; a controller configured to obtain some or all of the three UE capability RAT containers from the UE capability information message, the first UE capability RAT container having one or more bands of the first radio access technology; a first information element containing information; and a fourth information element containing information regarding the necessity of a measurement gap in each band of the first information element; the second UE capability RAT container includes: a second information element including information on one or more bands of a second radio access technology; and a fifth information element including information regarding whether or not a measurement gap is required in each band of the second information element. and the third UE capability RAT container includes a third information element including a plurality of band information including both a first radio access technology and a second radio access technology; and information regarding whether or not a measurement gap is required in each band of the second information element.

(3) A third embodiment of the present invention is a method applied to a terminal device that communicates with a base station device, the method including a radio resource control (RRC) message for inquiring capability information from the base station device. (UE capability information inquiry message);
transmitting an RRC message (UE capability information message) for notifying capability information to the base station device; a first information element comprising one or more band information of a first radio access technology; , a fourth information element including information regarding the necessity of measurement gaps in each band of the first information element, and the second UE capability RAT container includes one of the second radio access technologies. or a second information element including information on a plurality of bands; and a fifth information element including information on whether or not a measurement gap is required in each band of the second information element, and the third UE capability RAT The container includes a third information element containing a plurality of band information including both the first radio access technology and the second radio access technology, and a third information element containing information about each band of the first information element and the second information element. and a sixth information element including information regarding whether or not a measurement gap is necessary in the measurement gap.

(4) A fourth embodiment of the present invention is a method applied to a base station device that communicates with a terminal device, the method comprising: sending a radio resource control (RRC) message ( a step of transmitting a UE capability information inquiry message); a step of receiving an RRC message for capability information notification (UE capability information message) from the terminal device; a first UE capability RAT container; retrieving some or all of a third UE capability RAT container from the UE capability information message, wherein the first UE capability RAT container includes one or more of the first radio access technologies. a first information element including band information of the first information element; and a fourth information element including information regarding the necessity of a measurement gap in each band of the first information element; a second information element containing information on one or more bands of a second radio access technology; and a fifth information element containing information regarding the necessity or non-necessity of a measurement gap in each band of the second information element. , wherein the third UE capability RAT container includes a third information element including a plurality of band information including both a first radio access technology and a second radio access technology; and a sixth information element including information regarding the necessity of a measurement gap in each band of the second information element.

(5) A fifth embodiment of the present invention is a terminal device that communicates with a base station device, the radio resource control (RRC) message (UE capability information inquiry) for inquiring capability information from the base station device. a first UE capability RAT container; a first UE capability RAT container; a first UE capability RAT container; a second UE capability RAT container, a function implemented in including a part or all of a third UE capability RAT container in the UE capability information message, is performed on the terminal device; The RAT container includes a first information element including information on one or more bands of a first radio access technology, and a fourth information element including information regarding whether or not a measurement gap is required in each band of the first information element. an information element, the second UE capability RAT container includes a second information element comprising one or more band information of a second radio access technology; and each band of the second information element. a fifth information element including information regarding the necessity of a measurement gap in the third UE capability RAT container, and the third UE capability RAT container includes a plurality of A third information element includes band information, and a sixth information element includes information regarding whether or not a measurement gap is required in each band of the first information element and the second information element.

(6) A sixth embodiment of the present invention is a base station device that communicates with a terminal device, the radio resource control (RRC) message (UE capability information inquiry message) for inquiring capability information to the terminal device. ), a function implemented in receiving an RRC message (UE capability information message) for notification of capability information from the terminal device, a first UE capability RAT container, a second UE capability RAT container, a UE capability RAT container, and a function implemented to obtain a part or all of a third UE capability RAT container from the UE capability information message, for the terminal device; a first information element containing information on one or more bands of the first radio access technology; and a fourth information element containing information regarding the necessity or non-necessity of a measurement gap in each band of the first information element. and the second UE capability RAT container includes a second information element comprising one or more band information of a second radio access technology, and measurements in each band of the second information element. a fifth information element including information regarding whether or not a gap is necessary, and the third UE capability RAT container includes a plurality of band information including both a first radio access technology and a second radio access technology. and a sixth information element including information regarding the necessity of a measurement gap in each band of the first information element and the second information element.

(7) A seventh embodiment of the present invention is a terminal device that communicates with a base station device, the radio resource control (RRC) message (UE capability information inquiry) for inquiring capability information from the base station device. a receiving unit that receives a message); a transmitting unit that transmits an RRC message (UE capability information message) for notifying the base station device of capability information; 1 information element, a second information element indicating band information of a supported second radio access technology, and a third information element indicating band information of a supported second radio access technology. a control unit that includes an information element in the UE capability information message, the control unit including information indicating whether a measurement gap is required when performing inter-frequency measurements in the first information element. When including in the UE capability information message a fourth information element shown in an order corresponding to the order of the bands shown, and including the second information element in the UE capability information message, the control unit: When the UE capability information message does not include information indicating whether a measurement gap is required when performing measurements between RATs, and the control unit includes the third information element in the UE capability information message. a fifth information element that indicates information indicating whether or not a measurement gap is required when performing measurements between RATs in an order that corresponds to the order of bands indicated in the third information element; is included in the UE capability information message.

This allows the UE 122 to efficiently notify capability information.

The program that runs on the device related to the present invention may be a program that controls a central processing unit (CPU) or the like to make the computer function so as to realize the functions of the above-described embodiments related to the present invention. . Programs or information handled by programs are temporarily read into volatile memory such as Random Access Memory (RAM) during processing, or stored in non-volatile memory such as flash memory or Hard Disk Drive (HDD), and then transferred as needed. Reading, modification, and writing are performed by the CPU accordingly.

Note that a part of the apparatus in the embodiment described above may be realized by a computer. In that case, the program for realizing this control function is recorded on a computer-readable recording medium, and the program recorded on the recording medium is read into the computer system and executed. Good too. The "computer system" herein refers to a computer system built into the device, and includes hardware such as an operating system and peripheral devices. Further, the "computer-readable recording medium" may be any semiconductor recording medium, optical recording medium, magnetic recording medium, etc.

Furthermore, a ``computer-readable recording medium'' refers to a computer-readable storage medium that dynamically stores a program for a short period of time, such as a communication line when transmitting a program via a network such as the Internet or a communication line such as a telephone line. It may also include a device that retains a program for a certain period of time, such as a volatile memory inside a computer system that serves as a server or client. Further, the above-mentioned program may be one for realizing a part of the above-mentioned functions, or may be one that can realize the above-mentioned functions in combination with a program already recorded in the computer system. .

Additionally, each functional block or feature of the apparatus used in the embodiments described above may be implemented or performed in an electrical circuit, typically an integrated circuit or multiple integrated circuits. An electrical circuit designed to perform the functions described herein may be a general purpose processor, digital signal processor (DSP), application specific integrated circuit (ASIC), field programmable gate array (FPGA), or other programmable logic devices, discrete gate or transistor logic, discrete hardware components, or combinations thereof. A general purpose processor may be a microprocessor, or in the alternative, the processor may be a conventional processor, controller, microcontroller, or state machine. The general-purpose processor or each of the circuits described above may be configured with a digital circuit or an analog circuit. Further, if an integrated circuit technology that replaces the current integrated circuit emerges due to advances in semiconductor technology, it is also possible to use an integrated circuit based on this technology.

Note that the present invention is not limited to the above-described embodiments. Although an example of the device has been described in the embodiment, the present invention is not limited thereto, and can be applied to stationary or non-movable electronic devices installed indoors or outdoors, such as AV devices, kitchen devices, It can be applied to terminal devices or communication devices such as cleaning/washing equipment, air conditioning equipment, office equipment, vending machines, and other household equipment.

Although the embodiments of the present invention have been described above in detail with reference to the drawings, the specific configuration is not limited to these embodiments, and may include design changes within the scope of the gist of the present invention. Further, the present invention can be modified in various ways within the scope shown in the claims, and embodiments obtained by appropriately combining technical means disclosed in different embodiments are also included within the technical scope of the present invention. It will be done. Also included are configurations in which the elements described in the above embodiments are replaced with each other and have similar effects.

100 E-UTRA
102 eNB
104 EPC
106NR
108 gNB
110 5GC
112, 114, 116, 118, 120, 124 Interface 122 UE
200, 300 PHY
202, 302 MAC
204, 304 RLC
206, 306 PDCP
208, 308 RRC
310 SDAP
210, 312 NAS
400, 504 Receiving section 402, 502 Processing section 404, 500 Transmitting section

Claims (6)

A terminal device that communicates with a base station device,
a receiving unit that receives a radio resource control (RRC) message (UE capability information inquiry message) for inquiring capability information from the base station device;
a transmitting unit that transmits an RRC message (UE capability information message) for notifying capability information to the base station device;
a control unit that includes part or all of a first UE capability RAT container, a second UE capability RAT container, and a third UE capability RAT container in the UE capability information message;
The first UE capability RAT container includes a first information element including information on one or more bands of a first radio access technology, and information regarding the necessity of a measurement gap in each band of the first information element. a fourth information element containing information, and the fourth information element does not include information regarding the necessity of measurement gaps in some frequency range bands of each band of the first information element. , the fourth information element is a measurement gap for the NR band of the FR2 when the first information element includes information on both the NR band of the FR2 and the NR band other than the FR2. does not include a field indicating whether or not
The second UE capability RAT container includes a second information element including information on one or more bands of a second radio access technology, and information regarding whether or not a measurement gap is required in each band of the second information element. a fifth information element containing information;
The third UE capability RAT container includes a third information element including a plurality of band information including both a first radio access technology and a second radio access technology; and a sixth information element including information regarding whether or not a measurement gap is required in each band of the second information element. A base station device that communicates with a terminal device,
a transmitting unit that transmits a radio resource control (RRC) message (UE capability information inquiry message) for inquiring capability information to the terminal device;
a receiving unit that receives an RRC message (UE capability information message) for notification of capability information from the terminal device;
a control unit that acquires part or all of a first UE capability RAT container, a second UE capability RAT container, and a third UE capability RAT container from the UE capability information message;
The first UE capability RAT container includes a first information element including information on one or more bands of a first radio access technology, and information regarding the necessity of a measurement gap in each band of the first information element. a fourth information element containing information, and the fourth information element does not include information regarding the necessity of measurement gaps in some frequency range bands of each band of the first information element. , the fourth information element is a measurement gap for the NR band of the FR2 when the first information element includes information on both the NR band of the FR2 and the NR band other than the FR2. does not include a field indicating whether or not
The second UE capability RAT container includes a second information element including information on one or more bands of a second radio access technology, and information regarding whether or not a measurement gap is required in each band of the second information element. a fifth information element containing information;
The third UE capability RAT container includes a third information element including a plurality of band information including both a first radio access technology and a second radio access technology; and a sixth information element including information regarding whether or not a measurement gap is required in each band of the information element of No. 2. A method applied to a terminal device communicating with a base station device, the method comprising:
receiving a radio resource control (RRC) message (UE capability information inquiry message) for inquiring capability information from the base station device;
transmitting an RRC message (UE capability information message) for notifying capability information to the base station device;
including some or all of a first UE capability RAT container, a second UE capability RAT container, and a third UE capability RAT container in the UE capability information message;
The first UE capability RAT container includes a first information element including information on one or more bands of a first radio access technology, and information regarding the necessity of a measurement gap in each band of the first information element. a fourth information element containing information, and the fourth information element does not include information regarding the necessity of measurement gaps in some frequency range bands of each band of the first information element. , the fourth information element is a measurement gap for the NR band of the FR2 when the first information element includes information on both the NR band of the FR2 and the NR band other than the FR2. does not include a field indicating whether or not
The second UE capability RAT container includes a second information element including information on one or more bands of a second radio access technology, and information regarding whether or not a measurement gap is required in each band of the second information element. a fifth information element containing information;
The third UE capability RAT container includes a third information element including a plurality of band information including both a first radio access technology and a second radio access technology; and a sixth information element including information regarding whether or not a measurement gap is required in each band of the second information element. A method applied to a base station device communicating with a terminal device, the method comprising:
transmitting a radio resource control (RRC) message (UE capability information inquiry message) to the terminal device to inquire about capability information;
receiving an RRC message (UE capability information message) for notification of capability information from the terminal device;
retrieving some or all of a first UE capability RAT container, a second UE capability RAT container, and a third UE capability RAT container from the UE capability information message;
The first UE capability RAT container includes a first information element including information on one or more bands of a first radio access technology, and information regarding the necessity of a measurement gap in each band of the first information element. a fourth information element containing information, and the fourth information element does not include information regarding the necessity of measurement gaps in some frequency range bands of each band of the first information element. , the fourth information element is a measurement gap for the NR band of the FR2 when the first information element includes information on both the NR band of the FR2 and the NR band other than the FR2. does not include a field indicating whether or not
The second UE capability RAT container includes a second information element including information on one or more bands of a second radio access technology, and information regarding whether or not a measurement gap is required in each band of the second information element. a fifth information element containing information;
The third UE capability RAT container includes a third information element including a plurality of band information including both a first radio access technology and a second radio access technology; and a sixth information element including information regarding whether or not a measurement gap is required in each band of the second information element. A terminal device that communicates with a base station device,
A function implemented in receiving a radio resource control (RRC) message (UE capability information inquiry message) for inquiring capability information from the base station device;
A function implemented in transmitting an RRC message (UE capability information message) for notifying capability information to the base station device;
and a function implemented in including part or all of a first UE capability RAT container, a second UE capability RAT container, and a third UE capability RAT container in the UE capability information message. let me,
The first UE capability RAT container includes a first information element including information on one or more bands of a first radio access technology, and information regarding the necessity of a measurement gap in each band of the first information element. a fourth information element containing information, and the fourth information element does not include information regarding the necessity of measurement gaps in some frequency range bands of each band of the first information element. , the fourth information element is a measurement gap for the NR band of the FR2 when the first information element includes information on both the NR band of the FR2 and the NR band other than the FR2. does not include a field indicating whether or not
The second UE capability RAT container includes a second information element including information on one or more bands of a second radio access technology, and information regarding whether or not a measurement gap is required in each band of the second information element. a fifth information element containing information;
The third UE capability RAT container includes a third information element including a plurality of band information including both a first radio access technology and a second radio access technology; and a sixth information element including information regarding whether or not a measurement gap is required in each band of the second information element. A base station device that communicates with a terminal device,
A function implemented in transmitting a radio resource control (RRC) message (UE capability information inquiry message) for inquiring capability information to the terminal device;
A function implemented to receive an RRC message (UE capability information message) for notification of capability information from the terminal device;
a function implemented to obtain part or all of a first UE capability RAT container, a second UE capability RAT container, and a third UE capability RAT container from the UE capability information message; Let it show,
The first UE capability RAT container includes a first information element including information on one or more bands of a first radio access technology, and information regarding the necessity of a measurement gap in each band of the first information element. a fourth information element containing information, and the fourth information element does not include information regarding the necessity of measurement gaps in some frequency range bands of each band of the first information element. , the fourth information element is a measurement gap for the NR band of the FR2 when the first information element includes information on both the NR band of the FR2 and the NR band other than the FR2. does not include a field indicating whether or not
The second UE capability RAT container includes a second information element including information on one or more bands of a second radio access technology, and information regarding whether or not a measurement gap is required in each band of the second information element. a fifth information element containing information;
The third UE capability RAT container includes a third information element including a plurality of band information including both a first radio access technology and a second radio access technology; and a sixth information element including information regarding whether or not a measurement gap is required in each band of the second information element.

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