JP2020136734A - Terminal device, method, and integrated circuit - Google Patents

Abstract

To provide a technique relating to a terminal device, a method, and an integrated circuit that can reduce the complexity of protocol processing, improve communication quality, and perform efficient communication.SOLUTION: A method of a terminal device that communicates with a base station device includes: generating a delay budget report information element by including a delay budget adjustment value in the delay budget report information element based on receiving a delay budget adjustment request from an upper layer; and notifying the upper layer of the delay budget adjustment being performed and information on any or all of adjusted values based on detecting that the delay budget of the terminal device is adjusted according to the delay budget adjustment value after transmitting an RRC message including the delay budget report information element to the base station device.SELECTED DRAWING: Figure 7

Description

The present invention relates to terminal devices, methods, and integrated circuits.

Cellular mobile communication wireless access schemes and networks (hereinafter referred to as "Long Term Evolution (LTE: registered trademark)" or "Evolved Universal Terrestrial Radio Access: E-UTRA"), and core networks (hereinafter referred to as "E-UTRA"). "Evolved Packet Core: EPC") is being considered in the 3rd Generation Partnership Project (3GPP).

In addition, in 3GPP, as wireless access methods and wireless network technologies for 5th generation cellular systems, technical studies of LTE-Advanced Pro, which is an extended technology of LTE, and NR (New Radio technology), which is a new wireless access technology. And standards have been established (Non-Patent Document 1). In addition, 5GC (5 Generation Core Network), which is a core network for the 5th generation cellular system, is also being studied (Non-Patent Document 2).

Further, in 3GPP, the processing of media such as audio and video, which are provided as services using the 3GPP wireless network and core network, is being standardized. The services provided by 3GPP are performed using the IMS (IP Multimedia Subsystem) network, which is a 3GPP call control network (Non-Patent Document 17).

3GPP RP-170855, "Work Item on New Radio (NR) Access Technology" 3GPP TS 23.501 v15.3.0, "System Architecture for the 5G System; Stage 2" 3GPP TS 36.300, v15.3.0, "Evolved Universal Terrestrial Radio Access (E-UTRA) and Evolved Universal Terrestrial Radio Access Network; Network (E-UTRA)" 3GPP TS 36.331 v15.3.0, "Evolved Universal Terrestrial Radio Access (E-UTRA); Radio Access Control (RRC); Protocol specialties" 3GPP TS 36.323 v15.3.0, "Evolved Universal Terrestrial Radio Access (E-UTRA); Packet Data Convergence Specification (PDCP) Specification" 3GPP TS 36.322 v15.3.0, "Evolved Universal Terrestrial Radio Access (E-UTRA); Radio Link Control (RLC) Protocol Specification" 3GPP TS 36.321 v15.3.0, "Evolved Universal Terrestrial Radio Access (E-UTRA); Medium Access Control (MAC) protocol specification" 3GPP TS 37.340v 15.3.0, "Evolved Universal Terrestrial Radio Access (E-UTRA) and NR; Multi-Connectivity; Stage 2" 3GPP TS 38.300v 15.3.0, "NR; NR and NG-RAN Overall description; Stage 2" 3GPP TS 38.331 v15.3.0, "NR; Radio Resource Control (RRC); Protocol specialties" 3GPP TS 38.323 v15.3.0, "NR; Packet Data Convergence Protocol (PDCP) Specification" 3GPP TS 38.322 v15.3.0, "NR; Radio Link Control (RLC) protocol specification" 3GPP TS 38.321 v15.3.0, "NR; Medium Access Control (MAC) protocol specification" 3GPP TS 23.401 v15.0.0, "General Packet Radio Service (GPRS) enhancements for Evolved Universal Terrestrial Radio Access Network" (E-UTRAN) ac 3GPP TS 23.502 v15.3.0, "Procedure for 5G System; Stage 2" 3GPP TS 37.324 v15.1.0, "NR; Service Data Adaptation Protocol (SDAP) specification" 3GPP TS 26.114 v15.4.0, "IP Multimedia Subsystem (IMS); Multimedia telephony; Multimedia handling and interaction" 3GPP S4-181433, "LS on E2E_DELAY"

The quality of service experienced by users who enjoy media services generally depends on the data loss rate, delay, and the like. Therefore, in Rel-14 of 3GPP, a delayed budget reporting technique has been standardized for E-UTRA (Non-Patent Document 4). Delayed budget reporting technology shortens the connected mode intermittent reception (DRX) cycle by sending a delayed budget report to the base station device when the radio quality of the terminal device being communicated is good. When the request is made and the base station device is set to shorten the DRX cycle of the terminal device according to the request, the data transmission / reception delay is shortened, and conversely, when the radio quality of the terminal device during communication is poor, the terminal device is the base. It is a technology that sends another type of delay budget report to the station equipment, and the base station equipment makes settings related to coverage enhancement of the terminal equipment according to the request, so that the data transmission / reception delay becomes longer but the data loss rate is reduced.

In the delay budget reporting technology, the data transmission side terminal device and the data reception side terminal device can be expected to improve the quality of experience of the user who enjoys the service by adjusting the delay budget with each other. However, since the delay budget reporting technology standardized by Rel-14 is a technology used only between the terminal device and the base station device, the data transmitting side terminal device and the data receiving side terminal device are mutually delayed. There was a problem that the budget could not be adjusted.

Non-Patent Document 18 examines and discloses a method of notifying a terminal device of a communication partner of a delay budget of a data transmitting side terminal device at an application layer by using RTCP (Real-time Transport Control Protocol). However, it is not disclosed how the application layer can know the adjustment of the delay budget by the delay budget reporting technology in the lower layer E-UTRA.

One aspect of the present invention has been made in view of the above circumstances, and is used in a terminal device capable of reducing the complexity of protocol processing, improving communication quality, and efficiently performing communication. One of the purposes is to provide an integrated circuit mounted on the terminal device.

In order to achieve the above object, one aspect of the present invention has taken the following measures. That is, it is a terminal device that communicates with the base station device, and includes a receiving unit that receives an RRC message from the base station device, and an information element instructing that the delay budget report transmission is set in the RRC message. Based on the fact that the delay budget report transmission is set and the delay budget adjustment request from the upper layer is received, the adjustment value of the delay budget according to the delay budget adjustment request from the upper layer is delayed. The processing unit includes a processing unit included in the budget report information element and a transmission unit that transmits an RRC message including the delay budget report information element to the base station apparatus. The processing unit includes the delay budget report information by the transmission unit. After transmitting the RRC message including the element to the base station device, the delay budget adjustment is performed on the upper layer based on the detection that the delay budget of the terminal device is adjusted according to the adjustment value of the delay budget. Notify information about what has happened and any or all of the adjusted values.

Further, one aspect of the present invention is a method of a terminal device that communicates with a base station device, in which an RRC message is received from the base station device, and the RRC message is instructed to be set to transmit a delayed budget report. Based on the fact that the information element is included, the delay budget report transmission is set, and the delay budget according to the delay budget adjustment request from the upper layer is received based on the delay budget adjustment request from the upper layer. The adjustment value of is included in the delay budget report information element, the RRC message including the delay budget report information element is transmitted to the base station apparatus, and the RRC message including the delay budget report information element is transmitted to the base station apparatus. After transmitting to, the delay budget adjustment was performed on the upper layer based on the detection that the delay budget of the terminal device was adjusted according to the adjustment value of the delay budget, and among the adjusted values. Notify information about any or all.

It should be noted that these comprehensive or specific embodiments may be realized in a system, device, method, integrated circuit, computer program, or recording medium, and the system, device, method, integrated circuit, computer program, and recording medium. It may be realized by any combination of.

According to one aspect of the present invention, the terminal device can reduce the complexity of protocol processing, improve the communication quality, and perform communication efficiently.

The schematic diagram of the communication system which concerns on embodiment of this invention. The protocol stack diagram of UP and CP of the terminal device and the base station device in E-UTRA in the embodiment of the present invention. The protocol stack diagram of UP and CP of the terminal device and the base station device in NR in the embodiment of the present invention. An example of an RRC message transmitted / received between a terminal device and a base station device according to each embodiment of the present invention. The block diagram which shows the structure of the terminal apparatus in each embodiment of this invention. The block diagram which shows the structure of the base station apparatus in each embodiment of this invention. An example of a processing method for a terminal device and a base station device according to an embodiment of the present invention.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

LTE (and LTE-A Pro) and NR may be defined as different RATs. NR may also be defined as a technique included in LTE. LTE may be defined as a technique included in NR. In addition, LTE that can be connected to NR by Multi Radio Dual connectivity may be distinguished from conventional LTE. Further, LTE having a core network of 5GC may be distinguished from conventional LTE having a core network of EPC. This embodiment may be applied to NR, LTE and other RATs. In the following description, the terms related to LTE and NR will be used, but they may be applied in other techniques using other terms. Further, the term E-UTRA in the present 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 view of a communication system according to each embodiment of the present invention.

The E-UTRA100 is a wireless access technology described in Non-Patent Document 3 and the like, and is composed of a cell group (Cell Group: CG) composed of one or a plurality of frequency bands. The eNB (E-UTRAN Node B) 102 is a base station device of the E-UTRA100. The EPC (Evolved Package Core) 104 is a core network described in Non-Patent Document 14 and the like, and was designed as a core network for the E-UTRA100. The interface 112 is an interface between the eNB 102 and the EPC 104, and has a control plane (Control Plane: CP) through which control signals pass and a user plane (User Plane: UP) through which user data passes.

NR106 is a wireless access technology described in Non-Patent Document 9 and the like, and is composed of a cell group (Cell Group: CG) composed of one or a plurality of frequency bands. gNB (g Node B) 108 is a base station device of NR106. The 5GC110 is a core network described in Non-Patent Document 2 and the like, and is designed as a core network for the NR106, but may be used as a core network for the E-UTRA100 having a function of connecting to the 5GC110. Hereinafter, the E-UTRA 100 may include the E-UTRA 100 having a function of connecting to the 5GC110.

Interface 114 is an interface between eNB 102 and 5GC110, interface 116 is an interface between gNB108 and 5GC110, interface 118 is an interface between gNB108 and EPC104, interface 120 is an interface between eNB102 and gNB108, and interface 124 is an interface between EPC104 and 5GC110. The interface between. Interface 114, interface 116, interface 118, interface 120, interface 124, and the like may be CP only, UP only, or an interface that passes through both CP and UP. Further, the interface 114, the interface 116, the interface 118, the interface 120, the interface 124, and the like may not exist depending on the communication system provided by the telecommunications carrier.

The UE 122 is a terminal device corresponding to any or all of the E-UTRA100 and the NR106. As described in any or all of Non-Patent Documents 3 and 9, when the UE 122 connects to the core network via any or all of the E-UTRA100 and NR106, the UE 122 and A logical path called a radio bearer (RB: Radio Bearer) is established between any or all of the E-UTRA100 and the NR106. The radio bearer used for CP is called a signaling radio bearer (SRB: Signaling Radio Bearer), 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 SRB RB identifier is called an SRB identifier (SRB Identity or SRB ID), and the DRB RB identifier 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 any or all of the E-UTRA100 and the NR106 is further equipped with the EPC104. It is uniquely associated with each EPS (Evolved Patent System) bearer that passes through the inside. Each EPS bearer is assigned an EPS bearer identifier (Identity or ID) and is uniquely identified. Also, the same QoS is guaranteed for the 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 5GC110, one or more DRBs established between the UE 122 and any or all of the E-UTRA100 and the NR106 Furthermore, the PDU (Packet) established within 5GC110
Data Unit) Linked to one of the sessions. There is one or more QoS flows in each PDU session. Each DRB may be associated (mapped) with one or more QoS flows existing in the associated PDU session, or may not be associated with any QoS flow. Each PDU session is identified by a PDU session identifier (Identity, or ID). Each QoS flow is identified by a QoS flow identifier. Further, the same QoS is guaranteed for the data passing through the same QoS flow.

EPC104 does not have any or all of the PDU sessions and QoS flows, and 5GC110 does not have EPS bearers. In other words, when the UE 122 is connected to the EPC 104, the UE 122 has information on the EPS bearer, and when the UE 122 is connected to the 5GC110, the UE 122 has any or all of the information in the PDU session and the QoS flow. ..

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

FIG. 2A is a protocol stack diagram of UP used when the UE 122 communicates with the eNB 102 in the E-UTRA100.

The PHY (Physical layer) 200 is a wireless physical layer (radio physical layer), and provides a transmission service to an upper layer (upper layer) by using a physical channel (Physical Channel). The PHY200 is a higher-level MAC (Medium) described later.
It is connected to the Access Control layer 202 by a transport channel (Transport Channel). Data moves between MAC202 and PHY200 via a transport channel. Data is transmitted and received between the PHY of the UE 122 and the eNB 102 via the radio physical channel.

The MAC 202 is a medium access control layer (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, via a logical channel. The logical channel is roughly classified according to the type of information to be transmitted, and is divided into a control channel for transmitting control information and a traffic channel for transmitting user information. The MAC202 has a function of controlling PHY200 for performing intermittent transmission (DRX / DTX), a function of executing a random access (Random Access) procedure, a function of notifying transmission power information, a function of performing HARQ control, and the like. Has (Non-Patent Document 7).

The RLC204 divides the data received from the upper PDCP (Packet Data Convergence Protocol Layer) 206, which will be described later, by segmentation, and adjusts the data size so that the lower layer (lower layer) can appropriately transmit the data. It is a wireless link control layer (wireless link control layer). In addition, the RLC 200 also has a function for guaranteeing the QoS (Quality of Service) required by each data. That is, the RLC 204 has a function such as data retransmission control (Non-Patent Document 6).

PDCP206 is a packet data convergence protocol layer (packet data convergence protocol layer) for efficiently transmitting an IP packet (IP Packet) which is user data in a wireless section. The PDCP206 may have a header compression function that compresses unnecessary control information. The PDCP206 may also have a data encryption function (Non-Patent Document 5).

The data processed by MAC202, RLC204, and PDCP206 are referred to as MAC PDU (Protocol Data Unit), RLC PDU, and PDU PDU, respectively. Further, the data passed from the upper layer to MAC202, RLC204, and PDCP206, or the data passed to the upper layer are called MAC SDU (Service Data Unit), RLC SDU, and PDCP SDU, respectively.

FIG. 2B 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-UTRA100. ..

In addition to PHY200, MAC202, RLC204, and PDCP206, RRC (Radio Resource Control layer) 208 and NAS (non Access Stratum) 210 are present in the protocol stack of CP. The RRC208 performs processes such as establishing, reestablishing, suspending, and canceling the RRC connection, and resetting the RRC connection, for example, a radio bearer (RB) and a cell group (Cell Group). Wireless link control layer (wireless link control) that establishes, changes, releases, etc., controls logical channels, transport channels, physical channels, etc., and also sets handover and measurement (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 route for transmitting an RRC message which is control information. You may. The DRB may be used as a route for transmitting user data. Each RB may be set between the eNB 102 and the RRC 208 of the UE 122. Further, the portion of RB composed of RLC204 and MAC202 may be called an RLC bearer (Non-Patent Document 4). Also, for the NAS layer that carries the signal between the MME and the UE 122, AS some or all of the layers of the PHY200, MAC202, RLC204, PDCP206, RRC208 that carry the signal and data between the UE 122 and the eNB 102. It may be referred to as an (Access Signal) layer.

The above-mentioned functional classifications of MAC202, RLC204, PDCP206, and RRC208 are examples, and some or all of the functions may not be implemented. Further, a part or all of the functions of each layer may be included in another layer.

The IP layer, the TCP (Transmission Control Protocol) layer above the IP layer, the UDP (User Datagram Protocol) layer, the application layer, and the like are higher layers of the PDCP layer (not shown). Further, the RRC layer and the NAS (non Access Stratum) layer are also higher layers of the PDCP layer (not shown). In other words, the PDCP layer is a lower layer of the RRC layer, the NAS layer, the IP layer, the TCP (Transmission Control Protocol) layer above the IP layer, the UDP (User Datagram Protocol) layer, and the application layer.

FIG. 3 is a protocol stack (Protocol Stack) diagram of 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. 3A is a protocol stack diagram of UP used when UE 122 communicates with gNB 108 in NR106.

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

The MAC 302 is a medium access control layer (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 described later by a logical channel. The logical channel is roughly classified according to the type of information to be transmitted, and may be divided into a control channel for transmitting control information and a traffic channel for transmitting user information. The MAC 302 has a function of controlling PHY300 for intermittent transmission (DRX / DTX), a function of executing a random access (Random Access) procedure, a function of notifying transmission power information, a function of performing HARQ control, and the like. You may have it (Non-Patent Document 13).

The RLC 304 is a wireless link control that divides the data received from the upper PDCP (Packet Data Convergence Protocol Layer) 206, which will be described later, and adjusts the data size so that the lower layer can appropriately transmit the data. It is a layer (wireless link control layer). Further, the RLC 304 may also have a function for guaranteeing the 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 PDCP306 is a packet data convergence protocol layer (packet data convergence protocol layer) that efficiently transmits IP packets (IP Packets) that are user data in a wireless section. PDCP306 may have a header compression function that compresses unnecessary control information. The PDCP306 may also have a data encryption function (Non-Patent Document 11).

The SDAP (Service Data Application Protocol) 310 is associated with the downlink QoS flow sent from the 5GC110 to the terminal device via the base station device and the DRB (mapping: mapping), and from the terminal device to the base station device via the base station device. It is a service data adaptation protocol layer (service data adaptation protocol layer) having a function of mapping the uplink QoS flow sent to the 5GC110 with the DRB and storing the mapping rule information (Non-Patent Document 16).

FIG. 3B is a protocol stack diagram of the CP used when the UE 122 communicates with the gNB 108 and the AMF (Access and Mobility Management function), which is a logical node that provides functions such as authentication and mobility management, in the NR 106. ..

In addition to PHY300, MAC302, RLC304, and PDCP306, RRC (Radio Resource Control layer) 308 and NAS (non Access Stratum) 310 are present in the CP protocol stack. The RRC308 performs processes such as establishing, reestablishing, suspending, and canceling the RRC connection, and resetting the RRC connection, for example, a radio bearer (RB) and a cell group (Cell Group). Wireless link control layer (wireless link control) that establishes, changes, releases, etc., controls logical channels, transport channels, physical channels, etc., and also sets handover and measurement (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 route for transmitting an RRC message which is control information. You may. The DRB may be used as a route for transmitting user data. Each RB may be set between the gNB 108 and the RRC 308 of the UE 122. Further, the portion of the RB composed of RLC 304 and MAC 302 may be called an RLC bearer (Non-Patent Document 10). Also, for NAS layers that carry signals between AMF and UE 122, some or all layers of PHY300, MAC302, RLC304, PDCP306, RRC308, SDAP310 that carry signals and data between UE 122 and gNB 108 May be referred to as an AS (Access Signal) layer.

MAC302, RLC304, PDCP306, SDAP310, and RRC3 mentioned above
The functional classification of 08 is an example, and it is not necessary to implement a part or all of each function. Further, a part or all of the functions of each layer (each layer) may be included in another layer (layer).

The IP layer, the TCP (Transmission Control Protocol) layer above the IP layer, the UDP (User Datagram Protocol) layer, the application layer, and the like are any or all of the SDAP layer and the PDCP layer. Not shown). Further, the RRC layer and the NAS (non Access Stratum) layer may also be an upper layer of any or all of the SDAP layer and the PDCP layer (not shown). In other words, any or all of the SDAP layer and PDCP layer are the RRC layer, NAS layer, IP layer, and TCP (Transmission Protocol) layer above the IP layer, UDP (User Datagram Protocol) layer, and application layer. It becomes a lower layer of any or all of.

In each embodiment of the present invention, SIP (Session Initiation Protocol) and SDP (Session Description Protocol) used in IMS, RTP (Real-time Transport Protocol) used for media communication or media communication control, and RTCP. Any or all of (Real-time Transport Control Protocol), HTTP (HyperText Transfer Protocol), etc., and code codes of various media, etc. shall belong to the application layer.

In addition, each layer belonging to the AS layer set in any or all of the terminal device and the base station device, or the function of each layer may be referred to as an entity. That is, the MAC layer, the RLC layer, the PDCP layer, the SDAP layer, and the RRC layer, or the functions of each layer, which are set in any or all of the terminal device and the base station device, are referred to as MAC entities. They may be referred to as RLC entity, PDCP entity, SDAP entity, and RRC entity, respectively.

In each embodiment of the present invention, in order to distinguish between the E-UTRA protocol and the NR protocol, MAC202, RLC204, PDCP206, and RRC208 are used as MAC for E-UTRA or MAC for LTE, and E-UTRA, respectively. RLC for LTE or LTE, PDCP for E-UTRA or PDCP for LTE, and RRC for E-UTRA or RRC for LTE. Further, MAC302, RLC304, PDCP306, and RRC308 may be referred to as NR MAC, NR RLC, NR RLC, and NR RRC, respectively. Alternatively, it may be described using a space as E-UTRA PDCP, LTE PDCP, NR PDCP, or the like.

Further, as shown in FIG. 1, the eNB 102, gNB 108, EPC 104, and 5GC 110 may be connected via the interface 112, the interface 116, the interface 118, the interface 120, and the interface 114. Therefore, the RRC208 in FIG. 2 may be replaced with the RRC308 in FIG. 3 in order to support various communication systems. Further, the PDCP206 of FIG. 2 may be replaced with the PDCP306 of FIG. Further, the RRC308 of FIG. 3 may include the function of the RRC208 of FIG. Further, the PDCP306 of FIG. 3 may be the PDCP206 of FIG. Further, in the E-UTRA 100, NR PDCP may be used as the PDCP even when the UE 122 communicates with the eNB 102.

Next, the state transition of UE 122 in LTE and NR will be described. The UE 122 connected to the EPC has an RRC connection established (RRC connection has).
When been staffed), it may be in the RRC_CONNECTED state. Also, the UE 122 may be in the RRC_INACIVE state (if the UE 122 is connected to 5GC) when the RRC connection is dormant. If not in those cases, UE 122 may be in the RRC_IDLE state.

Although the UE 122 connected to the EPC does not have the RRC_INACIVE state, the suspension of the RRC connection may be started by E-UTRAN. In this case, when the RRC connection is suspended, the UE 122 transitions to the RRC_IDLE state by holding the AS context of the UE and the identifier (resumeIdentity) used for returning. When the UE 122 holds the AS context of the UE, the E-UTRAN allows the return of the RRC connection (Permit), and the UE 122 needs to transition from the RRC_IDLE state to the RRC_CONNECTED state, the hibernated RRC Restoration of the connection may be initiated by a higher layer (eg NAS layer).

That is, the definition of pause may be different between the UE 122 connected to the EPC and the UE 122 connected to the 5GC. In addition, when the UE 122 is connected to the EPC (when it is hibernating in the RRC_IDLE state) and when it is connected to the 5GC (when it is hibernating in the RRC_INACTIVE state), all the procedures for returning from hibernation or Some may be different.

The RRC_CONNECTED state, RRC_INACTIVE state, and RRC_IDLE state may be referred to as a connected state (connected mode), an inactive state (inactive mode), and a dormant state (idle mode), respectively.

The AS context of the UE held by the UE 122 includes the current RRC setting, the current security context, the PDCP state including the ROHC (RObust Header Compression) state, the C-RNTI used in the PCell of the connection source (Source), and the cell identifier. (CellIdentity), physical cell identifier of the PCell of the connection source, may be information including all or a part. The AS context of the UE held by any or all of the eNB 102 and the gNB 108 may include the same information as the AS context of the UE held by the UE 122, or the information included in the AS context of the UE held by the UE 122. May contain information different from.

The security context is an encryption key at the AS level, NH (Next Hop).
Parameter), NCC (Next Hop Chaining Counter parameter) used to derive the access key for the next hop, the identifier of the selected AS-level encryption algorithm, and the counter used for replay protection, all or part of the information. May be.

(Embodiment 1)
Embodiments of the present invention will be described with reference to FIGS. 1 to 7. In the embodiment of the present invention, in order for the terminal device to request the base station device to adjust the delay budget, the RRC message including the delay budget reporting information element is transmitted to the base station device and then adjusted to the requested delay budget. Based on detecting the matter, the upper layer is notified that the delay budget has been adjusted.

The delay budget in the present embodiment is defined as the connected mode intermittent reception (DRX: discontinuou) described in Non-Patent Document 4 or Non-Patent Document 10.
It may be the length of the dimension cycle (hereinafter, the connection mode is abbreviated and may be referred to as a DRX cycle), and it is allowed by the coverage enhancement or coverage enhancement described in Non-Patent Document 4. It may be the length of the delay. Further, in the embodiment of the present invention, the upper layer may be an application layer. In the present embodiment, the application layer may be referred to as an MTSI (Multimedia Telephony Service for IMS) layer. Further, in the embodiment of the present invention, the lower layer may be an AS layer or an RRC layer.

Further, the RAT to which the embodiment of the present invention is applied may be E-UTRA or NR. It may also be another RAT.

FIG. 4 is an example of an RRC message transmitted and received between the terminal device and the base station device according to each embodiment of the present invention. FIG. 4 (A) shows an RRC message sent from the base station apparatus (eNB 102 or gNB 108) to the terminal apparatus (UE122), and FIG. 4 (B) shows an RRC transmitted from the terminal apparatus (UE 122) to the base station apparatus (eNB 102 or gNB 108). This is an example of a message.

The RRC message of E-UTRA is described in Non-Patent Document 4, and the RRC message of NR is described in Non-Patent Document 10. As an RRC message sent from the base station device (eNB 102 or gNB 108) to the terminal device (UE 122), for example, a message for performing an RRC connection resetting procedure (RRC Connection Reconfiguration described in Non-Patent Document 4). There are messages, RRC Reconfiguration messages described in Non-Patent Document 10, and the like. Further, as the RRC message sent from the terminal device (UE122) to the base station device (eNB102 or gNB108), the above-mentioned confirmation response message in the RRC connection resetting procedure (RRC connection resetting confirmation message described in Non-Patent Document 4). And RRC resetting confirmation described in Non-Patent Document 10) and the like. UE Assistance Information means, which is a means for transmitting various information of the terminal device to the base station device as an RRC message sent from the terminal device (UE 122) to the base station device (eNB 102 or gNB 108). There is a UE assistance information message etc. used for.

The RRC Connection Reconfiguration procedure sets the establishment, change, release of the radio bearer (RB) in the E-UTRA, and the change, release, etc. of the secondary cell described in Non-Patent Document 4. In addition to this, it is a procedure used for setting handover, measurement, and the like. On the other hand, the RRC reconfiguration procedure (RRC Reconfiguration) sets the establishment, change, release of RB in NR, change, release of secondary cell, etc. described in Non-Patent Document 10, and also causes handover (resetting with synchronization). ) And measurement (Measurement) and the like.

The UE assistance information means is used to request the base station device to adjust the delay budget (delay budget) such as the wireless interface delay between the terminal device and the base station device or the connection mode DRX length, and the terminal device. It is used to report overheating information to the base station equipment.

The parameters included in each RRC message are referred to as information elements (IE: Information Elements) or fields. In the embodiment of the present invention, the field may be referred to as an information element.

FIG. 5 is a block diagram showing a configuration of a terminal device (UE122) according to each embodiment of the present invention. In addition, in order to avoid complicated explanation, FIG. 5 shows only the main components closely related to the present invention.

The UE 122 shown in FIG. 5 is a receiving unit 500 that receives any or all of the reception of the RRC message or the like transmitted from the eNB 102 or the gNB 108 and the reception of the application layer signaling or the like transmitted from the communication partner, and the received RRC. Settings according to any or all of the various information elements (IE: Information Element) and fields included in the message, processing related to the AS layer such as creating RRC messages, received application layer signaling, etc. Transmission of RRC messages, etc. to the processing unit 502, eNB 102, or gNB 108, which performs any or all of the operations according to the above and the processing related to the application layer such as the creation of application layer signaling, and the application layer to the communication partner. It is composed of a transmission unit 504 that performs any or all of transmissions such as signaling. Further, a control unit that controls the operation of each unit based on various conditions may be separately provided.

FIG. 6 is a block diagram showing a configuration of a base station apparatus (eNB102 or gNB108) according to each embodiment of the present invention. In order to avoid complicating the explanation, FIG. 6 shows only the main components closely related to the present invention.

The eNB 102 or gNB 108 shown in FIG. 6 creates a message including any or all of the transmission unit 800 that transmits an RRC message or the like to the UE 122, various information elements (IE: Information Elements), and fields and the like. It is composed of a processing unit 802 that causes the processing unit 502 of the UE 122 to perform processing by transmitting to the UE 122, and a receiving unit 804 that receives an RRC message or the like from the UE 122. Further, a control unit that controls the operation of each unit based on various conditions may be separately provided.

An example of the processing method of the terminal device and the base station device according to the embodiment of the present invention will be described with reference to FIG. 7. In FIG. 7, the operation in NR is assumed and the gNB 108 is used as the base station apparatus. However, the operation may be for the E-UTRA, and in this case, the base station apparatus may be the eNB 102.

The processing unit 602 of the gNB 108 creates an RRC message including an information element instructing the UE 122 to set the delayed budget report transmission, and transmits the RRC message from the transmitting unit 604 to the UE 122. The information element instructing the setting of the delayed budget report transmission described above may be an information element related to the setting of the timer for prohibiting the transmission of the delayed budget report for a certain period of time. Further, the RRC message including the information element instructing the setting of the delay budget report transmission described above may be an RRC connection reset message or an RRC reset message. (Step S700)

The reception unit 500 of the UE 122 receives the RRC message transmitted from the gNB 108 including the information element instructing the setting of the delay budget report transmission described above, and the processing unit 502 of the UE 122 sets the delay budget report. (Step S702)

The processing unit 502 of the UE 122 creates a delay budget report information element, which is an information element for instructing the gNB 108 to adjust the delay budget based on a certain condition. The above-mentioned certain conditions are as follows: (1) After receiving the RRC message including the information element instructing to set the above-mentioned delayed budget report transmission, the RRC message including the delayed budget report information element is transmitted to the gNB 108 even once. If not, (2) If the current delay budget is different from the delay budget that instructed gNB108 to adjust last time, and the timer for prohibiting the transmission of the delay budget report for a certain period of time is not operating, (3) ) When a delay budget adjustment request is received from the upper layer, it may be any or all of the cases, or it may be a condition other than this. In the case of the condition (3), it may be added to the condition that the timer for prohibiting the transmission of the delayed budget report for a certain period of time is not activated. In the creation of the delay budget reporting information element described above, the processing unit 502 of the UE 122 may include the required adjustment value of the delay budget in the delay budget reporting information element. The above-mentioned adjustment value may be the difference between the delay budget currently set in the UE 122 and the required delay budget. For example, when instructing the adjustment of the DRX cycle length as the delay budget, the difference required for the adjustment from the currently set DRX cycle length may be included in the delay budget report information element in milliseconds as the adjustment value. Further, for example, when instructing the adjustment of the coverage enhancement setting as a delay budget, the difference between the currently set interface delay between the UE 122 and the gNB 108 and the required interface delay is used as the adjustment value as the delay budget value in milliseconds. It may be included in the delayed budget reporting information element. If a delay budget adjustment request is received from a higher layer and the above adjustment request contains information about the delay budget that requires adjustment, the adjustment value is adjusted according to the above information about the delay budget that requires adjustment. May be set. (Step S704)

Next, the transmission unit 504 of the UE 122 transmits the RRC message including the delay budget report information element created by the processing unit 502 to the gNB 108. The RRC message including the delay budget reporting information element described above may be a UE assistance information message or another message. (Step S706)

Next, the processing unit 502 of the UE 122 detects that the delay budget has been adjusted according to the adjustment value of the delay budget instructed to the gNB 108. The above-mentioned detection that the delay budget has been adjusted includes a new delay budget such as DRX length and coverage enhancement setting from gNB 108 after sending an RRC message including a delay budget reporting information element to gNB 108 in step S706. It may be detected by receiving the RRC message and following the adjustment value of the delay budget requested by the new delay budget, or a value close to the adjustment value, or another method may be used. The RRC message including the DRX length and the coverage enhancement setting described above may be a message of the RRC connection resetting procedure. Based on the fact that the processing unit 502 of the UE 122 detects that the delay budget has been adjusted according to the adjustment value of the delay budget instructed to gNB 108, the delay budget has been adjusted to the upper layer, and the adjusted delay budget has been adjusted. You may notify any or all of the information about the value of. The above-mentioned "detected that the delay budget was adjusted according to the adjustment value of the delay budget instructed to gNB 108" indicates that "the delay budget was adjusted according to the adjustment value of the delay budget instructed to gNB 108". Any other expression may be used as long as it means "done". For example, it may be "delayed budget adjusted well", "delayed budget resolved", "delayed budget report succeeded", or in other terms. There may be. (Step S708)

In the delay budget report information element created in step 704, a field including the adjustment value of the DRX cycle length and a field including the adjustment value of the coverage enhancement setting may be set separately. For example, the field including the adjustment value of the DRX cycle length may be named type 1, and the field including the adjustment value of the coverage enhancement setting may be named type 2. Further, for example, the delay budget report information element including the adjustment value of the DRX cycle length is called the delay budget report type 1, and the delay budget report information element including the adjustment value of the coverage enhancement setting is called the delay budget report type 2. But it's okay.

When the processing unit 502 of the UE 122 receives the information element related to the setting of the timer for prohibiting the transmission of the delayed budget report for a certain period of time in step S702, the processing unit 502 of the UE 122 determines the timer for prohibiting the transmission of the delayed budget report for a certain period of time. Information about the value may be notified to the upper layer.

Further, the processing unit 502 of the UE 122 may or may not perform any or all of transmission and reception of delay budget information signaling (Delay Budget Information (DBI) signaling) in the upper layer from the upper layer. You may receive information indicating that. Further, in step S708, based on the detection that the delay budget has been adjusted according to the adjustment value of the delay budget instructed to gNB 108, the delay budget has been adjusted to the upper layer, and the adjusted delay budget value. The process of notifying any or all of the information regarding the above-mentioned delay budget information signaling is performed only when the information indicating that any or all of the above-mentioned transmission and reception of the delayed budget information signaling is performed is received from the upper layer. It may be done. The delay budget information signaling described above may be signaling using RTCP feedback. Further, whether or not any or all of the transmission and reception of the above-mentioned delayed budget information signaling is performed may be negotiated using the SDP offer and the SDP answer.

Further, in step S708, based on the detection that the delay budget has been adjusted according to the adjustment value of the delay budget instructed to gNB 108, the delay budget has been adjusted to the upper layer, and the adjusted delay budget value. In step S704, the condition for invoking the creation of the delayed budget report information element is "(3) When a delayed budget adjustment request is received from the upper layer" for the process of notifying any or all of the information related to. It may be done based on something.

In the upper layer of the terminal device, the delay budget notified in the lower layer of the terminal device was adjusted in the process of step S708, and any or all of the adjusted delay budget values were used as described above. Delayed budget information signaling may be generated and transmitted to the communication partner.

Further, when the above-mentioned delay budget information signaling is received from the communication partner in the upper layer of the terminal device, the above-mentioned delay budget adjustment request may be notified to the lower layer of the terminal device. At this time, the delay budget information included in the above-mentioned delay budget information signaling may be sent together with the lower layer of the terminal device.

Embodiments of the present invention are summarized as follows.

A terminal device that communicates with a base station device, and includes a receiving unit that receives an RRC message from the base station device, and an information element instructing the RRC message to set delay budget report transmission. Based on the fact, the delay budget report transmission is set, and the delay budget adjustment value according to the delay budget adjustment request from the upper layer is set based on the delay budget adjustment request from the upper layer. The processing unit includes a processing unit included in the report information element and a transmission unit that transmits an RRC message including the delay budget report information element to the base station apparatus. The processing unit includes the delay budget report information element by the transmission unit. After transmitting the RRC message including the above to the base station device, the delay budget adjustment was performed on the upper layer based on the detection that the delay budget of the terminal device was adjusted according to the adjustment value of the delay budget. Notify any or all of the information about the matter and the adjusted value.

Further, it is a method of a terminal device that communicates with a base station device, and includes an information element instructing that an RRC message is received from the base station device and that the delay budget report transmission is set in the RRC message. Based on the fact that the delay budget report transmission is set and the delay budget adjustment request from the upper layer is received, the adjustment value of the delay budget according to the delay budget adjustment request from the upper layer is delayed. After performing processing to be included in the budget report information element, transmitting an RRC message including the delayed budget report information element to the base station apparatus, and transmitting an RRC message including the delayed budget report information element to the base station apparatus, the terminal Information about any or all of the delay budget adjustments made to the upper layers and any or all of the adjusted values based on the detection that the delay budget of the device has been adjusted according to the adjustment values of the delay budget. Notify.

The delay budget may be the connection mode DRX cycle length. Further, the delay budget may be a coverage enhancement setting.

As described above, in the embodiment of the present invention, the terminal device notifies the upper layer that the delay budget adjustment has been performed, so that the terminal device is end-to-end with the communication partner in the upper layer of the terminal device. Delay adjustment can be performed. That is, the terminal device can suppress deterioration of call quality and efficiently perform communication.

The program that operates in the apparatus according to the present invention may be a program that controls the Central Processing Unit (CPU) or the like to operate the computer so as to realize the functions of the above-described embodiments related to the present invention. .. The program or information handled by the program is temporarily read into volatile memory such as Random Access Memory (RAM) at the time of processing, or stored in non-volatile memory such as flash memory or Hard Disk Drive (HDD), and is required. The CPU reads, corrects, and writes accordingly.

In addition, a part of the apparatus in the above-described embodiment may be realized by a computer. In that case, the program for realizing this control function is recorded on a recording medium that can be read by the computer, and the program recorded on the recording medium is read by the computer system and executed. May be good. The "computer system" referred to here is a computer system built into the device, and includes hardware such as an operating system and peripheral devices. Further, the "recording medium that can be read by a computer" may be any of a semiconductor recording medium, an optical recording medium, a magnetic recording medium, and the like.

Furthermore, a "recording medium that can be read by a computer" is a communication line that dynamically holds a program for a short time, like a communication line when a program is transmitted via a network such as the Internet or a communication line such as a telephone line. It may also include a program that holds a program for a certain period of time, such as a volatile memory inside a computer system that serves as a server or a client in that case. Further, the above program may be for realizing a part of the above-mentioned functions, and may be further realized by combining the above-mentioned functions with a program already recorded in the computer system. ..

Also, each functional block, or feature, of the device used in the embodiments described above may be implemented or implemented in an electrical circuit, i.e., typically an integrated circuit or a plurality of integrated circuits. Electrical circuits designed to perform the functions described herein are general purpose processors, digital signal processors (DSPs), application specific integrated circuits (ASICs), field programmable gate arrays (FPGAs), or others. Programmable logical device,
It may include discrete gates or transistor logic, discrete hardware components, or a combination thereof. The general purpose processor may be a microprocessor or instead the processor may be a conventional processor, controller, microprocessor, or state machine. The general-purpose processor or each of the above-mentioned circuits may be composed of a digital circuit or an analog circuit. In addition, when an integrated circuit technology that replaces the current integrated circuit appears due to advances in semiconductor technology, it is also possible to use an integrated circuit based on this technology.

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

Although the embodiments of the present invention have been described in detail with reference to the drawings, the specific configuration is not limited to this embodiment, and design changes and the like within a range not deviating from the gist of the present invention are also included. Further, the present invention can be variously modified within the scope of the claims, and the technical scope of the present invention also includes embodiments obtained by appropriately combining the technical means disclosed in the different embodiments. Is done. In addition, the elements described in the above embodiment include a configuration in which elements having the same effect are replaced with each other.

100 E-UTRA
102 eNB
104 EPC
106 NR
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
500,604 Receiver 502,602 Processing 504,600 Transmitter

Claims (6)

A terminal device that communicates with a base station device
A receiving unit that receives an RRC message from the base station device,
Based on the fact that the RRC message contains an information element instructing the setting of the delayed budget report transmission, the delayed budget report transmission is set.
Based on receiving the delay budget adjustment request from the upper layer, the processing unit that includes the adjustment value of the delay budget according to the delay budget adjustment request from the upper layer in the delay budget report information element.
It has a transmitter that transmits an RRC message including the delay budget reporting information element to the base station apparatus, and has.
The processing unit detected that the delay budget of the terminal device was adjusted according to the adjustment value of the delay budget after the transmission unit transmitted the RRC message including the delay budget reporting information element to the base station device. Based on the fact, inform the upper layer of information about the delay budget adjustment and any or all of the adjusted values.
Terminal equipment. The delay budget is the connection mode DRX cycle length.
The terminal device according to claim 1. The delay budget is a coverage enhancement setting.
The terminal device according to claim 1. A method of terminal equipment that communicates with base station equipment.
Upon receiving the RRC message from the base station apparatus,
Based on the fact that the RRC message contains an information element instructing the setting of the delayed budget report transmission, the delayed budget report transmission is set.
Based on receiving the delay budget adjustment request from the upper layer, the process of including the adjustment value of the delay budget according to the delay budget adjustment request from the upper layer in the delay budget report information element is performed.
An RRC message including the delay budget reporting information element is transmitted to the base station apparatus.
After transmitting the RRC message including the delay budget reporting information element to the base station device, the delay budget of the terminal device is delayed to the upper layer based on the detection that the delay budget is adjusted according to the adjustment value of the delay budget. Notify you of information about the budget adjustments made and any or all of the adjusted values,
Method. The delay budget is the connection mode DRX cycle length.
The method according to claim 4. The delay budget is a coverage enhancement setting.
The method according to claim 4.

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