KR20240013427A - Method and apparatus for providing Network Response Information in wireless communication system - Google Patents

Abstract

This disclosure relates to 5G or 6G communication systems to support higher data rates. This disclosure relates to terminal and base station operation in a wireless communication system, and particularly to a method and apparatus for providing network response information. The operation method of the terminal includes transmitting terminal capability information of the terminal to a base station, receiving a first message containing setting information for reporting preference settings of the terminal from the base station, and based on the setting information, Transmitting a second message containing the terminal's preference settings to a base station, receiving the first message, driving a first timer included in the first message, and when the first timer expires , including determining that the base station's response to the second message is rejected.

Description

{Method and apparatus for providing Network Response Information in wireless communication system}

This disclosure relates to terminal and base station operation in a wireless communication system, and particularly to a method and apparatus for providing network response information.

5G mobile communication technology defines a wide frequency band to enable fast transmission speeds and new services, and includes sub-6 GHz ('Sub 6GHz') bands such as 3.5 gigahertz (3.5 GHz) as well as millimeter wave (mm) bands such as 28 GHz and 39 GHz. It is also possible to implement it in the ultra-high frequency band ('Above 6GHz') called Wave. In addition, in the case of 6G mobile communication technology, which is called the system of Beyond 5G, Terra is working to achieve a transmission speed that is 50 times faster than 5G mobile communication technology and an ultra-low delay time that is reduced to one-tenth. Implementation in Terahertz (THz) bands (e.g., 3 terahertz bands at 95 GHz) is being considered.

In the early days of 5G mobile communication technology, there were concerns about ultra-wideband services (enhanced Mobile BroadBand, eMBB), ultra-reliable low-latency communications (URLLC), and massive machine-type communications (mMTC). With the goal of satisfying service support and performance requirements, efficient use of ultra-high frequency resources, including beamforming and massive array multiple input/output (Massive MIMO) to alleviate radio wave path loss in ultra-high frequency bands and increase radio transmission distance. Various numerology support (multiple subcarrier interval operation, etc.) and dynamic operation of slot format, initial access technology to support multi-beam transmission and broadband, definition and operation of BWP (Band-Width Part), large capacity New channel coding methods such as LDPC (Low Density Parity Check) codes for data transmission and Polar Code for highly reliable transmission of control information, L2 pre-processing, and dedicated services specialized for specific services. Standardization of network slicing, etc., which provides networks, has been carried out.

Currently, discussions are underway to improve and enhance the initial 5G mobile communication technology, considering the services that 5G mobile communication technology was intended to support, based on the vehicle's own location and status information. V2X (Vehicle-to-Everything) to help autonomous vehicles make driving decisions and increase user convenience, and NR-U (New Radio Unlicensed), which aims to operate a system that meets various regulatory requirements in unlicensed bands. ), NR terminal low power consumption technology (UE Power Saving), Non-Terrestrial Network (NTN), which is direct terminal-satellite communication to secure coverage in areas where communication with the terrestrial network is impossible, positioning, etc. Physical layer standardization for technology is in progress.

In addition, IAB (IAB) provides a node for expanding the network service area by integrating intelligent factories (Industrial Internet of Things, IIoT) to support new services through linkage and convergence with other industries, and wireless backhaul links and access links. Integrated Access and Backhaul, Mobility Enhancement including Conditional Handover and DAPS (Dual Active Protocol Stack) handover, and 2-step Random Access (2-step RACH for simplification of random access procedures) Standardization in the field of wireless interface architecture/protocol for technologies such as NR) is also in progress, and 5G baseline for incorporating Network Functions Virtualization (NFV) and Software-Defined Networking (SDN) technology Standardization in the field of system architecture/services for architecture (e.g., Service based Architecture, Service based Interface) and Mobile Edge Computing (MEC), which provides services based on the location of the terminal, is also in progress.

When this 5G mobile communication system is commercialized, an explosive increase in connected devices will be connected to the communication network. Accordingly, it is expected that strengthening the functions and performance of the 5G mobile communication system and integrated operation of connected devices will be necessary. To this end, eXtended Reality (XR) and Artificial Intelligence are designed to efficiently support Augmented Reality (AR), Virtual Reality (VR), and Mixed Reality (MR). , AI) and machine learning (ML), new research will be conducted on 5G performance improvement and complexity reduction, AI service support, metaverse service support, and drone communication.

In addition, the development of these 5G mobile communication systems includes new waveforms, full dimensional MIMO (FD-MIMO), and array antennas to ensure coverage in the terahertz band of 6G mobile communication technology. , multi-antenna transmission technology such as Large Scale Antenna, metamaterial-based lens and antenna to improve coverage of terahertz band signals, high-dimensional spatial multiplexing technology using OAM (Orbital Angular Momentum), RIS ( In addition to Reconfigurable Intelligent Surface technology, Full Duplex technology, satellite, and AI (Artificial Intelligence) to improve the frequency efficiency of 6G mobile communication technology and system network are utilized from the design stage and end-to-end. -to-End) Development of AI-based communication technology that realizes system optimization by internalizing AI support functions, and next-generation distributed computing technology that realizes services of complexity beyond the limits of terminal computing capabilities by utilizing ultra-high-performance communication and computing resources. It could be the basis for .

The disclosed embodiment seeks to provide an apparatus and method that can effectively provide services in a wireless communication system.

According to an embodiment of the present disclosure, a method for a terminal to receive network response information includes the steps of transmitting terminal capability information of the terminal to a base station, and setting information for reporting preference settings of the terminal from the base station. Receiving a first message, transmitting a second message containing preference settings of the terminal based on the setting information to a base station, after receiving the first message, the first message included in the first message It may include driving a timer, and when the first timer expires, determining that the base station's response to the second message is rejected.

The present disclosure provides an apparatus and method that can effectively provide services in a wireless communication system.

FIG. 1A is a diagram illustrating the structure of a next-generation wireless communication system according to an embodiment of the present disclosure.
FIG. 1B is a flowchart of a process in which a terminal reports predetermined information reporting preferences to a base station in a wireless communication system according to an embodiment of the present disclosure.
FIG. 1C is a flowchart of a process for recognizing network rejection of a terminal's reset request through a predetermined timer according to an embodiment of the present disclosure.
FIG. 1D is a flowchart of a process for recognizing network rejection of a terminal's reset request through a predetermined indicator according to an embodiment of the present disclosure.
Figure 1E is a flowchart of terminal operations according to an embodiment of the present disclosure.
1F is a flowchart of base station operation according to an embodiment of the present disclosure.
Figure 1g is a block diagram showing the internal structure of a terminal according to an embodiment of the present disclosure.
Figure 1h is a block diagram showing the configuration of a base station according to an embodiment of the present disclosure.

In the following description of the present invention, if a detailed description of a related known function or configuration is judged to unnecessarily obscure the gist of the present invention, the detailed description will be omitted. In addition, the terms described below are terms defined in consideration of the functions in the present disclosure, and may vary depending on the intention or custom of the user or operator. Therefore, the definition should be made based on the contents throughout this specification. Hereinafter, embodiments of the present invention may be described with reference to the attached drawings. The advantages and features of the present disclosure and methods for achieving them will become clear by referring to the embodiments described in detail below along with the accompanying drawings. However, the present disclosure is not limited to the embodiments disclosed below and may be implemented in various different forms, and the present embodiments are merely intended to ensure that the disclosure is complete and to provide common knowledge in the technical field to which the present disclosure pertains. It is provided to fully inform those who have the scope of the invention, and the present disclosure is only defined by the scope of the claims. The same reference numerals may refer to the same elements throughout the specification.

At this time, it will be understood that each block of the processing flow diagrams and combinations of the flow diagram diagrams can be performed by computer program instructions. These computer program instructions can be mounted on a processor of a general-purpose computer, special-purpose computer, or other programmable data processing equipment, so that the instructions performed through the processor of the computer or other programmable data processing equipment are described in the flow chart block(s). It creates the means to perform functions. These computer program instructions may also be stored in computer-usable or computer-readable memory that can be directed to a computer or other programmable data processing equipment to implement a function in a particular manner, so that the computer-usable or computer-readable memory It is also possible to produce manufactured items containing instruction means that perform the functions described in the flowchart block(s). Computer program instructions can also be mounted on a computer or other programmable data processing equipment, so that a series of operational steps are performed on the computer or other programmable data processing equipment to create a process that is executed by the computer, thereby generating a process that is executed by the computer or other programmable data processing equipment. Instructions that perform processing equipment may also provide steps for executing the functions described in the flow diagram block(s).

Additionally, each block may represent a module, segment, or portion of code that includes one or more executable instructions for executing specified logical function(s). Additionally, it may be noted that in some alternative implementation examples it is possible for the functions mentioned in the blocks to occur out of order. For example, it is possible for two blocks shown in succession to be performed substantially simultaneously, or it is possible for the blocks to be performed in reverse order depending on the corresponding function.

At this time, the term '~unit' used in this embodiment refers to software or hardware components such as FPGA (Field Programmable Gate Array) or ASIC (Application Specific Integrated Circuit), and '~unit' performs certain roles. can do. However, '~part' is not limited to software or hardware. The '~ part' may be configured to reside in an addressable storage medium and may be configured to reproduce on one or more processors. Therefore, as an example, '~ part' refers to components such as software components, object-oriented software components, class components, and task components, processes, functions, properties, and procedures. , subroutines, segments of program code, drivers, firmware, microcode, circuitry, data, databases, data structures, tables, arrays, and variables. The functions provided within the components and 'parts' may be combined into a smaller number of components and 'parts' or may be further separated into additional components and 'parts'. In addition, the components and 'parts' may be implemented to regenerate one or more CPUs within the device or secure multimedia card. Also, in an embodiment, '~ part' may include one or more processors.

In the following description of the present disclosure, if a detailed description of a related known function or configuration is determined to unnecessarily obscure the gist of the present disclosure, the detailed description will be omitted. Hereinafter, embodiments of the present disclosure may be described with reference to the attached drawings.

Terms used in the following description to identify a connection node, terms referring to network entities, terms referring to messages, terms referring to interfaces between network objects, and various identification information. Referring terms, etc. are exemplified for convenience of explanation. Accordingly, the present disclosure is not limited to the terms described below, and other terms referring to objects having equivalent technical meaning may be used.

In the following description, physical channel and signal may be used interchangeably with data or control signals. For example, PDSCH (physical downlink shared channel) is a term that refers to a physical channel through which data is transmitted, but PDSCH can also be used to refer to data. That is, in the present disclosure, the expression 'can transmit a physical channel' can be interpreted as equivalent to the expression 'can transmit data or a signal through a physical channel'.

Hereinafter, in the present disclosure, higher signaling may refer to a method of transmitting a signal from a base station to a terminal using a downlink data channel of the physical layer, or from a terminal to a base station using an uplink data channel of the physical layer. High-level signaling can be understood as radio resource control (RRC) signaling or media access control (MAC) control element (CE).

For convenience of description below, the present disclosure may use terms and names defined in the 3rd Generation Partnership Project NR (New Radio) (3GPP NR) or 3rd Generation Partnership Project Long Term Evolution (3GPP LTE) specifications. However, the present disclosure is not limited by terms and names, and can be equally applied to systems that comply with other standards. In this disclosure, gNB may be used interchangeably with eNB for convenience of explanation. That is, a base station described as an eNB may represent a gNB. Additionally, the term terminal can refer to mobile phones, MTC devices, NB-IoT devices, sensors, as well as other wireless communication devices.

Hereinafter, the base station is the entity that performs resource allocation for the terminal, and may be at least one of gNodeB (gNB), eNode B (eNB), NodeB, BS (Base Station), wireless access unit, base station controller, or node on the network. . A terminal may include a UE (User Equipment), MS (Mobile Station), a cellular phone, a smartphone, a computer, or a multimedia system capable of performing communication functions. Of course, this is not limited to examples.

In particular, the present disclosure is applicable to 3GPP NR (5th generation mobile communication standard). In addition, this disclosure provides intelligent services (e.g., smart home, smart building, smart city, smart car or connected car, healthcare, digital education, retail, security and safety-related services) based on 5G communication technology and IoT-related technology. etc.) can be applied. In this disclosure, eNB may be used interchangeably with gNB for convenience of explanation. That is, a base station described as an eNB may represent a gNB. Additionally, the term terminal can refer to mobile phones, NB-IoT devices, sensors, as well as other wireless communication devices.

Wireless communication systems have moved away from providing early voice-oriented services to, for example, 3GPP's HSPA (High Speed Packet Access), LTE (Long Term Evolution or E-UTRA (Evolved Universal Terrestrial Radio Access)), and LTE-Advanced. Broadband wireless that provides high-speed, high-quality packet data services such as communication standards such as (LTE-A), LTE-Pro, 3GPP2's High Rate Packet Data (HRPD), UMB (Ultra Mobile Broadband), and IEEE's 802.16e. It is evolving into a communication system.

As a representative example of a broadband wireless communication system, the LTE system uses Orthogonal Frequency Division Multiplexing (OFDM) in the downlink (DL), and Single Carrier Frequency Division Multiple Access (SC-FDMA) in the uplink (UL). ) method is adopted. Uplink refers to a wireless link in which a terminal (UE; User Equipment or MS; Mobile Station) transmits data or control signals to a base station (eNode B or BS; Base Station), and downlink refers to a wireless link in which the base station transmits data or control signals to the terminal. It can refer to a wireless link that transmits signals. Multiple access methods such as this can distinguish each user's data or control information by allocating and operating the time-frequency resources to carry data or control information for each user so that they do not overlap, that is, orthogonality is established. .

As a future communication system after LTE, that is, the 5G communication system must be able to freely reflect the various requirements of users and service providers, so services that simultaneously satisfy various requirements may need to be supported. Services considered for the 5G communication system include Enhanced Mobile BroadBand (eMBB), massive Machine Type Communication (mMTC), and Ultra Reliability Low Latency Communication (URLLC). There is.

According to some embodiments, eMBB may aim to provide more improved data transmission rates than those supported by existing LTE, LTE-A, or LTE-Pro. For example, in a 5G communication system, eMBB may need to be able to provide a peak data rate of 20Gbps in the downlink and a peak data rate of 10Gbps in the uplink from the perspective of one base station. In addition, the 5G communication system may need to provide the maximum transmission rate and at the same time provide an increased user perceived data rate. In order to meet these requirements, the 5G communication system may require improvements in various transmission and reception technologies, including more advanced multi-antenna (MIMO; Multi Input Multi Output) transmission technology. In addition, while the current LTE transmits signals using a maximum of 20 MHz transmission bandwidth in the 2 GHz band, the 5G communication system uses a frequency bandwidth wider than 20 MHz in the 3 to 6 GHz or above 6 GHz frequency band, meeting the requirements of the 5G communication system. Data transfer speed can be satisfied.

At the same time, mMTC is being considered to support application services such as Internet of Things (IoT) in 5G communication systems. In order to efficiently provide the Internet of Things, mMTC may require support for access to a large number of terminals within a cell, improved coverage of terminals, improved battery time, and reduced terminal costs. Since the Internet of Things is attached to various sensors and various devices to provide communication functions, it may need to be able to support a large number of terminals (for example, 1,000,000 terminals/km2) within a cell. Additionally, due to the nature of the service, terminals supporting mMTC are likely to be located in shadow areas that cannot be covered by cells, such as the basement of a building, so wider coverage may be required compared to other services provided by the 5G communication system. Terminals that support mMTC must be composed of low-cost terminals, and since it is difficult to frequently replace the terminal's battery, a very long battery life time, such as 10 to 15 years, may be required.

Lastly, in the case of URLLC, it is a cellular-based wireless communication service used for specific purposes (mission-critical), such as remote control of robots or machinery, industrial automation, It can be used for services such as unmanned aerial vehicles, remote health care, and emergency alerts. Therefore, the communication provided by URLLC may need to provide very low latency (ultra-low latency) and very high reliability (ultra-reliability). For example, a service supporting URLLC must satisfy an air interface latency of less than 0.5 milliseconds and may have a packet error rate of less than 10-5. Therefore, for services supporting URLLC, the 5G system must provide a smaller Transmit Time Interval (TTI) than other services, and at the same time, a design that requires allocating wide resources in the frequency band to ensure the reliability of the communication link. Specifications may be required.

The three services considered in the above-described 5G communication system, namely eMBB, URLLC, and mMTC, can be multiplexed and transmitted in one system. At this time, different transmission/reception techniques and transmission/reception parameters can be used between services to satisfy the different requirements of each service. However, the above-described mMTC, URLLC, and eMBB are only examples of different service types, and the service types to which this disclosure is applied are not limited to the above-described examples.

In addition, hereinafter, embodiments of the present disclosure will be described using LTE, LTE-A, LTE Pro, or 5G (or NR, next-generation mobile communication) systems as examples, but the present disclosure may also be applied to other communication systems with similar technical background or channel type. Examples of may be applied. In addition, the embodiments of the present disclosure may be applied to other communication systems through some modifications without significantly departing from the scope of the present disclosure at the discretion of a person with skilled technical knowledge.

FIG. 1A is a diagram illustrating the structure of a next-generation wireless communication system according to an embodiment of the present disclosure.

Referring to FIG. 1A, as shown, the radio access network of the next-generation wireless communication system (New Radio, NR) includes a next-generation base station (New Radio Node B, hereinafter gNB) (1a-10) and a radio core network (new radio core network). ), and the wireless core network may include AMF (1a-05, access management function). Of course, the configuration of the wireless access network is not limited to the examples described above. A user terminal (New Radio User Equipment, hereinafter referred to as NR user equipment (UE) or terminal) 1a-15 may access an external network through gNB 1a-10 and AMF 1a-05.

In Figure 1a, the gNB can connect to the eNB (Evolved Node B) of the existing LTE system. The gNB is connected to the NR UE through a wireless channel and can provide superior services than existing Node B (e.g., LTE base station) (1a-20). In the next-generation wireless communication system, all user traffic is serviced through a shared channel, so a device is needed to perform scheduling by collecting status information such as buffer status, available transmission power status, and/or channel status of UEs, It can be said that gNB (1a-10) can be responsible for this. One gNB can usually control multiple cells. In order to implement ultra-high-speed data transmission compared to existing LTE, it can have more than the existing maximum bandwidth, and additional beamforming technology can be used using Orthogonal Frequency Division Multiplexing (OFDM) as a wireless access technology. there is.

In addition, according to an embodiment of the present disclosure, gNB (1a-10) determines the modulation scheme and channel coding rate according to the channel state of the terminal. Adaptive Modulation & Coding (Adaptive Modulation & Coding) It can be said that the method (hereinafter referred to as AMC) can be applied. AMF (1a-05) may perform functions such as mobility support, bearer setup, and QoS (quality of service) setup. AMF (1a-05) is a device that handles various control functions as well as mobility management functions for the terminal and can be connected to multiple base stations. Additionally, the next-generation wireless communication system can be linked to the existing LTE system, and the AMF can be connected to the mobility management entity (MME) (1a-25) through a network interface. MME (1a-25) can be connected to eNB (1a-30), which is an existing base station. A terminal that supports LTE-NR Dual Connectivity (EN-DC) can transmit and receive data while maintaining connectivity to not only the gNB but also the eNB (1a-35).

FIG. 1B is a flowchart of a process in which a terminal reports predetermined information reporting preferences to a base station in a wireless communication system according to an embodiment of the present disclosure.

Referring to FIG. 1B, in a wireless communication system according to an embodiment of the present disclosure, the terminal (1b-05) sets the preferred settings of the terminal (1b-05) compared to the current settings to the base station (1b-10) for a certain purpose. can be reported to To this end, the base station 1b-10 may transmit configuration information for reporting preference settings to the terminal 1b-05 through the RRCReconfiguration message (1b-15). Setting information for reporting preference settings may include a predetermined prohibit timer to prevent reports from being transmitted frequently. For example, the inhibit timer can be set to 0 seconds, 0.5 seconds, 1 second, 2 seconds, ..., 30 seconds. The terminal (1b-05) may report separate preference settings to the base station (1b-10) for various purposes, and a dedicated inhibit timer may exist for each purpose. A timer for each purpose may be driven when preference settings corresponding to the purpose are transmitted to the base station 1b-10. Until the prohibition timer for each purpose expires, the terminal 1b-05 cannot transmit preference settings corresponding to the purpose to the base station 1b-10. For example, the purpose may be as follows:

- Preferred delay budget

- Preference for reducing power consumption (UE power preference)

- Preference for heat reduction (overheating assistance)

- IDC problem reporting and preferred solutions (IDC assistance)

- Solution to support multiple SIMs (MUSIM assistance), etc.

The terminal (1b-05) can detect (or confirm, identify) that the terminal power consumption should be reduced (1b-20), and for this, the terminal (1b-05) sets the maximum number of CCs. You can recognize (or determine) that it needs to be reduced (1b-25). The terminal 1b-05 may store the preferred maximum number of CCs in a predetermined information element (IE) (eg, MaxCC-Preference IE). The terminal (1b-05) can transmit a UEAssistanceInformation message including IE to the base station (1b-10) (1b-30). At this time, the terminal (1b-05) may drive one prohibit timer (eg, maxCC-PreferenceProhibitTimer) corresponding to the maximum number of preferred CCs (1b-35).

The base station 1b-10 may trigger a reset in response to the preference settings received from the terminal 1b-05 (1b-37). For example, the base station (1b-10) that has received the preference settings can reduce the maximum number of SCells and reset it to the terminal (1b-05). On the other hand, it may be up to the base station implementation whether the base station 1b-10, which has received the preference settings, resets it by reflecting the received preference settings. Accordingly, the base station 1b-10 may ignore the preference setting for some reason (1b-40). However, it may be difficult for the terminal 1b-05 to know whether the base station 1b-10 rejected the reset request. When the inhibit timer expires (1b-45), the terminal (1b-05) may retransmit the preference settings to the base station (1b-10) (1b-55). The terminal (1b-05) may have an implementation solution to solve the purpose as well as a reset request through the UEAssistanceInformation message. Accordingly, the terminal (1b-05) may trigger an implementation solution in addition to retransmission of preference settings (1b-50).

In the steps of FIG. 1B, the terminal 1b-05 cannot know whether the base station 1b-10 has rejected the reset request of the terminal 1b-05, so the terminal 1b-05 responds to the problem. There may be delays in quickly resolving the issue. For example, if the terminal 1b-05 can recognize that the base station 1b-10 will not reflect the reset request of the terminal 1b-05, it may immediately trigger an implementation solution.

In this embodiment, we propose a method of informing the terminal that the base station will not perform a reset reflecting the reset request reported by the terminal.

FIG. 1C is a flowchart of a process for recognizing network rejection of a terminal's reset request through a predetermined timer according to an embodiment of the present disclosure.

The UE (1c-05) may report UE capabilities (eg, UE capabilities) information to the base station (1c-10) (1c-15). The terminal capability information may include an indicator indicating whether the operation of recognizing network rejection proposed in this embodiment is supported. The base station 1c-10 can be set to report the terminal 1c-05's preferred settings according to a predetermined purpose (1c-20). The following fields corresponding to certain purposes can be stored in the OtherConfig IE of the RRCReconfiguration message. Each field below may contain setting information necessary for the terminal (1c-05) to perform reporting according to the purpose, and for an explanation, refer to TS38.331 (V17.1.0).

- delayBudgetReportingConfig

-overheatingAssistanceConfig

-idc-AssistanceConfig

- drx-PreferenceConfig

-maxBW-PreferenceConfig

-maxCC-PreferenceConfig

-maxMIMO-LayerPreferenceConfig

-minSchedulingOffsetPreferenceConfig

-releasePreferenceConfig

- referenceTimePreferenceReporting

-ul-GapFR2-PreferenceConfig

-musim-GapAssistanceConfig

-musim-LeaveAssistanceConfig

-maxBW-PreferenceConfigFR2-2

-maxMIMO-LayerPreferenceConfigFR2-2

-minSchedulingOffsetPreferenceConfigExt

-rlm-RelaxationReportingConfig

-bfd-RelaxationReportingConfig

-scg-DeactivationPreferenceConfig

For example, overheatingAssistanceConfig can be set to report preference settings to solve heat problems, and drx-PreferenceConfig, maxBW-PreferenceConfig, maxCC-PreferenceConfig, maxMIMO- to report preference settings to save terminal power consumption. LayerPreferenceConfig, releasePreferenceConfig, maxBW-PreferenceConfigFR2-2, maxMIMO-LayerPreferenceConfigFR2-2, scg-DeactivationPreferenceConfig, etc. can be set. An inhibition timer may be set corresponding to the setting information for reporting each preference setting.

In this embodiment, a new timer corresponding to each purpose can be proposed. In this embodiment, the new timer may be called NW Response Timer. A new timer (e.g., NW Response Timer) may start running when a preference setting corresponding to the purpose is reported to the base station (1c-10), and the terminal (1c-05) will report until the new timer expires. If the preferred settings are not reset by the base station 1c-10, the terminal 1c-05 may consider that the base station 1c-10 has rejected the reset request. The configuration value of each new timer can be stored in the OtherConfig IE of the RRCReconfiguration message along with the corresponding fields. The new timer may be stopped when the reporting setting of the corresponding preference setting is released or a specific operation, such as a re-establishment operation or a resume operation, is performed.

The terminal (1c-05) may detect that the terminal power consumption must be reduced (1c-25), and for this, the terminal (1c-05) may recognize that the maximum number of CCs must be reduced (1c-25). -30). The terminal (1c-05) can store the preferred maximum number of CCs in a predetermined IE (e.g., MaxCC-Preference IE) and transmit a UEAssistanceInformation message including the IE to the base station (1c-10) (1c) -35). At this time, the terminal may run one new timer corresponding to the preferred maximum CC number information (1c-40). At this time, the terminal may run one prohibit timer (e.g., maxCC-PreferenceProhibitTimer) corresponding to information on the maximum number of preferred CCs (1c-45).

Whether the base station 1c-10 that has received the preference setting reflects this and resets it is up to the implementation of the base station 1c-10. For certain reasons, the base station 1c-10 may reject the reset request (1c) -50). When the new timer expires (1c-55), the terminal (1c-05) may consider that the base station (1c-10) has rejected the reset request of the terminal (1c-05) (1c-60). The terminal (1c-05) may have an implementation solution to solve the purpose as well as a reset request through the UEAssistanceInformation message. Accordingly, the terminal 1c-05 may trigger an implementation solution in addition to retransmitting the preferred settings to the base station 1c-10 (1c-65). For example, the implementation solution is that after the terminal (1c-05) performs detach and attach operations (1c-70), the terminal (1c-05) is sent to the base station (1c-10). It may mean readjusting and reporting capabilities (1c-75). The above-described disconnection and connection operations of the terminal (1c-05) may mean operations of deregistering and re-registering the terminal (1c-05) to the network, and the terminal (1c-05) connects to re-register to the network. It may need to be in a mode (e.g. RRC connected mode). In one embodiment, the terminal 1c-05 may report to the base station 1c-10 with a capability that is lower than the capability of the terminal 1c-05 that reported to the base station 1c-10 in step 1c-15. Accordingly, the terminal 1c-05 can trigger an implementation solution by determining whether or not there is a reset from the network within a predetermined time according to the setting value of the new timer. When the new timer expires, the terminal 1c-05 may restart the currently running prohibition timer. The setting value of the new timer corresponding to one preference setting may not be set larger than the setting value of the prohibition timer corresponding to the same preference setting.

As another example, the inhibit timer may perform the role of the new timer proposed in this embodiment. In this embodiment, the new timer may be called NW Response Timer. That is, when the prohibit timer expires, this may mean that the terminal 1c-05 may retransmit the preference settings, or it may mean that the previously transmitted reset request was rejected by the network. At this time, there is an advantage in terms of signaling overhead because there is no need to define a new timer. However, if the setting value of the prohibit timer is large, the disadvantage is that it has to wait as long as the setting value of the prohibit timer to determine whether to reject the reset request. This can be.

In a dual connectivity (DC) scenario, a secondary node (SN) may provide a new timer.

FIG. 1D is a flowchart of a process for recognizing network rejection through a predetermined indicator in response to a terminal's reset request according to an embodiment of the present disclosure.

The UE (1d-05) may report UE capabilities (eg, UE capabilities) information to the base station (1d-10) (1d-15). The terminal capability information may include an indicator indicating whether the operation of recognizing network rejection proposed in this embodiment is supported. The base station 1d-10 can be set to report the terminal 1d-05's preferred settings according to a predetermined purpose (1d-20). The following fields corresponding to certain purposes can be stored in the OtherConfig IE of the RRCReconfiguration message. Each field below may contain setting information necessary for the terminal (1d-05) to perform reporting according to the purpose, and for an explanation, refer to TS38.331 (V17.1.0).

- delayBudgetReportingConfig

-overheatingAssistanceConfig

-idc-AssistanceConfig

- drx-PreferenceConfig

-maxBW-PreferenceConfig

-maxCC-PreferenceConfig

-maxMIMO-LayerPreferenceConfig

-minSchedulingOffsetPreferenceConfig

-releasePreferenceConfig

- referenceTimePreferenceReporting

-ul-GapFR2-PreferenceConfig

-musim-GapAssistanceConfig

-musim-LeaveAssistanceConfig

-maxBW-PreferenceConfigFR2-2

-maxMIMO-LayerPreferenceConfigFR2-2

-minSchedulingOffsetPreferenceConfigExt

-rlm-RelaxationReportingConfig

-bfd-RelaxationReportingConfig

-scg-DeactivationPreferenceConfig

For example, overheatingAssistanceConfig can be set to report preference settings to solve heat problems, and drx-PreferenceConfig, maxBW-PreferenceConfig, maxCC-PreferenceConfig, maxMIMO- to report preference settings to save terminal power consumption. LayerPreferenceConfig, releasePreferenceConfig, maxBW-PreferenceConfigFR2-2, maxMIMO-LayerPreferenceConfigFR2-2, scg-DeactivationPreferenceConfig, etc. can be set. An inhibition timer corresponding to the setting information for each preference setting report may be set.

In this embodiment, one explicit indication may be proposed to reject the reset request of the terminal 1d-05 corresponding to each purpose. The base station 1d-10 rejects the reconfiguration request reported by the terminal 1d-05 using any one of a predetermined RRC message (e.g., RRCReconfiguration message), MAC CE, or rejection indicator contained in L1 signaling. It can be instructed to do so. The terminal 1d-05, which has received a rejection indicator from the base station 1d-10, may regard the reset request of the terminal 1d-05 as being rejected during the validity time (eg, validity time). The effective time may be predefined or may be set by the base station 1d-10. If set by the base station 1d-10, information about the effective time may be contained in the OtherConfig IE of the RRCReconfiguration message along with the corresponding fields. The validity time may be considered invalid when the reporting setting of the corresponding preference setting is released, or when a specific operation is performed, such as a re-establishment operation or a resume operation.

The terminal (1d-05) may detect that the terminal power consumption must be reduced (1d-25), and for this, the terminal (1d-05) may recognize that the maximum number of CCs must be reduced (1d-25). -30). The terminal (1d-05) can store the preferred maximum number of CCs in a predetermined IE (e.g., MaxCC-Preference IE) and transmit a UEAssistanceInformation message including the IE to the base station (1d-10) (1d -35). At this time, the terminal (1d-05) may run one prohibit timer (eg, maxCC-PreferenceProhibitTimer) corresponding to information on the maximum number of preferred CCs (1d-40).

Whether the base station 1d-10 that has received the preference setting reflects this and resets it is up to the implementation of the base station 1d-10. Due to certain reasons, the base station 1d-10 may reject the reset request (1d-10). -45). At this time, the base station 1d-10 may transmit a rejection indicator indicating to reject the reset request to the terminal 1d-05 (1d-50). The terminal (1d-05) that has received the rejection indicator may consider that the base station (1d-10) has rejected the reset request (1d-55). The terminal (1d-05) may have an implementation solution to solve the purpose as well as a reset request through the UEAssistanceInformation message. Accordingly, the terminal 1d-05 may trigger an implementation solution in addition to retransmitting the preferred settings to the base station 1d-10 (1d-60). For example, the implementation solution refers to the capabilities of the terminal (1d-05) after performing the terminal (1d-05) detach and attach operations (1d-65), and the base station (1d-10). This may mean readjusting and reporting (1d-70). The above-described disconnection and connection operations of the terminal (1d-05) may mean operations of deregistering and re-registering the terminal (1d-05) to the network, and the terminal (1d-05) connects to re-register to the network. It may need to be in a mode (e.g. RRC connected mode). In one embodiment, the terminal 1d-05 may report to the base station 1d-10 with a capability that is lower than the capability of the terminal 1d-05 that reported to the base station 1d-10 in step 1d-15. Accordingly, the terminal 1d-05 can determine whether or not a reset is made from the network within a predetermined time based on reception of the rejection indicator and trigger an implementation solution. Upon receiving the rejection indicator, the terminal 1d-05 may restart the currently running inhibit timer.

As another example, an inhibit timer may perform the role of the valid time proposed in this embodiment. That is, when the terminal (1d-05) receives a rejection indicator, it restarts the prohibit timer, and the reset request of the terminal (1d-05) may be considered rejected until the prohibit timer expires.

At this time, since there is no need to newly define the valid time, there is an advantage in terms of signaling overhead, but since it cannot be set separately from the inhibit timer, there may be a disadvantage in that flexibility in setting the setting value of the valid time is reduced.

In a dual connectivity (DC) scenario, the SN may provide a valid time period.

The new timer and rejection indicator can be set and operated simultaneously.

Figure 1E is a flowchart of terminal operations according to an embodiment of the present disclosure.

In operation 1e-05, the terminal can report its capability information to the base station. Capability information may include an indicator indicating whether the operation of recognizing network rejection proposed in this embodiment is supported.

In operation 1e-10, the terminal may receive an RRCReconfiguration message containing configuration information for reporting the terminal's preferred settings according to a predetermined purpose from the base station. Setting information for reporting preference information may include setting values for a new timer and/or valid time period.

In operation 1e-15, the UE may transmit a UEAssistanceInformation message containing preferred settings to the base station for a specific purpose (e.g., UE power saving, overheating mitigation, etc.). The terminal can request a reset from the base station by sending a UEAssistanceInformation message containing preferred settings to the base station.

In operation 1e-20, the terminal may start a new timer.

In operation 1e-25, when the new timer expires or a predetermined rejection indicator is received from the base station, the terminal may consider the reset request to be rejected.

In operation 1e-30, the terminal may trigger a predetermined implementation solution to achieve the purpose.

1F is a flowchart of base station operation according to an embodiment of the present disclosure.

In operation 1f-05, the base station may receive terminal capability information of one terminal. The terminal capability information may include an indicator indicating whether the operation of recognizing network rejection proposed in this embodiment is supported.

In operation 1f-10, the base station may transmit to the UE an RRCReconfiguration message containing configuration information for reporting the UE's preferred settings according to a predetermined purpose (e.g., UE power saving, overheating mitigation, etc.).

In operation 1f-15, the base station may receive a UEAssistanceInformation message from the terminal containing the terminal's preferred settings for a specific purpose.

In operation 1f-20, the base station may transmit a predetermined rejection indicator to the terminal.

Figure 1g is a block diagram showing the internal structure of a terminal according to an embodiment of the present disclosure.

Referring to Figure 1g, the terminal may include a radio frequency (RF) processing unit (1g-10), a baseband processing unit (1g-20), a storage unit (1g-30), and a control unit (1g-40). It can be said that there is.

The RF processing unit 1g-10 can perform functions for transmitting and receiving signals through a wireless channel, such as band conversion and amplification of signals. That is, the RF processing unit 1g-10 can up-convert the baseband signal provided from the baseband processing unit 1g-20 into an RF band signal and transmit it through an antenna, and the RF band signal received through the antenna can be converted to an RF band signal. It can be down-converted to a baseband signal. For example, the RF processing unit (1g-10) may include a transmission filter, a reception filter, an amplifier, a mixer, an oscillator, a digital to analog convertor (DAC), an analog to digital convertor (ADC), etc. there is. Of course, the components of the RF processing unit 1l-10 described above are only an example, and the RF processing unit 1g-10 may further include other components or omit some of the components described above. Although only one antenna is shown in the drawing of FIG. 1g, the terminal may be equipped with multiple antennas. Additionally, the RF processing unit 1g-10 may include a plurality of RF chains. Furthermore, the RF processing unit 1g-10 can perform beamforming. For beamforming, the RF processing unit 1g-10 can adjust the phase and size of each signal transmitted and received through a plurality of antennas or antenna elements. Additionally, the RF processing unit 1g-10 can perform MIMO and can receive multiple layers when performing a MIMO operation.

The baseband processing unit 1g-20 can perform a conversion function between baseband signals and bit strings according to the physical layer specifications of the system. For example, when transmitting data, the baseband processing unit 1g-20 may generate complex symbols by encoding and modulating the transmission bit string. Additionally, when receiving data, the baseband processing unit 1g-20 can restore the received bit stream by demodulating and decoding the baseband signal provided from the RF processing unit 1g-10. For example, when following the OFDM (orthogonal frequency division multiplexing) method, when transmitting data, the baseband processing unit 1g-20 generates complex symbols by encoding and modulating the transmission bit string, and maps the complex symbols to subcarriers. After that, OFDM symbols can be configured through IFFT (inverse fast Fourier transform) operation and CP (cyclic prefix) insertion. In addition, when receiving data, the baseband processing unit 1g-20 divides the baseband signal provided from the RF processing unit 1g-10 into OFDM symbols and maps them to subcarriers through FFT (fast Fourier transform) operation. After restoring the signals, the received bit string can be restored through demodulation and decoding.

The baseband processing unit 1g-20 and the RF processing unit 1g-10 may transmit and/or receive signals as described above. Accordingly, the baseband processing unit 1g-20 and the RF processing unit 1g-10 may be referred to as a transmitting unit, a receiving unit, a transceiving unit, or a communication unit. Furthermore, at least one of the baseband processing unit 1g-20 and the RF processing unit 1g-10 may include a plurality of communication modules to support a plurality of different wireless access technologies. Additionally, at least one of the baseband processing unit 1g-20 and the RF processing unit 1g-10 may include different communication modules to process signals in different frequency bands. For example, different wireless access technologies may include wireless LAN (eg, IEEE 802.11), cellular network (eg, LTE), etc. Additionally, different frequency bands may include a super high frequency (SHF) (e.g., 2.NRHz, NRhz) band and a millimeter wave (mm wave) (e.g., 60GHz) band. The terminal may transmit and/or receive signals with the base station using the baseband processing unit 1g-20 and the RF processing unit 1g-10, and the signals may include control information and data.

The storage unit 1g-30 can store data such as basic programs, application programs, and setting information for operation of the terminal. In particular, the storage unit 1g-30 may store information related to a second access node that performs wireless communication using a second wireless access technology. Additionally, the storage unit 1g-30 may provide stored data upon request from the control unit 1g-40. The storage unit 1l-30 may be composed of a storage medium such as ROM, RAM, hard disk, CD-ROM, and DVD, or a combination of storage media. Additionally, the storage unit 1o-30 may be composed of a plurality of memories.

The control unit 1g-40 can control the overall operations of the terminal. For example, the control unit 1g-40 may transmit and/or receive signals through the baseband processing unit 1g-20 and the RF processing unit 1g-10. Additionally, the control unit 1g-40 writes and reads data into the storage unit 1g-40. For this purpose, the control unit 1g-40 may include at least one processor. For example, the control unit 1g-40 may include a communication processor (CP) that performs control for communication and an application processor (AP) that controls upper layers such as application programs. Additionally, at least one component within the terminal may be implemented with one chip. Figure 1h is a block diagram showing the configuration of a base station according to an embodiment of the present disclosure.

As shown in the figure, the base station includes an RF processing unit (1h-10), a baseband processing unit (1h-20), a backhaul communication unit (1h-30), a storage unit (1h-40), and/or a control unit (1h-50). ) may include.

The RF processing unit 1h-10 can perform functions for transmitting and receiving signals through a wireless channel, such as band conversion and amplification of signals. That is, the RF processing unit 1h-10 upconverts the baseband signal provided from the baseband processing unit 1h-20 into an RF band signal and transmits it through an antenna, and converts the RF band signal received through the antenna into a baseband signal. It can be down-converted into a signal. For example, the RF processing unit 1h-10 may include a transmission filter, a reception filter, an amplifier, a mixer, an oscillator, a DAC, and/or an ADC. In FIG. 1H, only one antenna is shown, but the first access node or base station may include a plurality of antennas. Additionally, the RF processing unit 1h-10 may include a plurality of RF chains. Furthermore, the RF processing unit 1h-10 can perform beamforming. For beamforming, the RF processing unit 1h-10 can adjust the phase and size of each signal transmitted and received through a plurality of antennas or antenna elements. The RF processing unit can perform downward MIMO operation by transmitting one or more layers.

The baseband processing unit 1h-20 may perform a conversion function between a baseband signal and a bit string according to the physical layer standard of the first wireless access technology. For example, when transmitting data, the baseband processing unit 1h-20 may generate complex symbols by encoding and modulating the transmission bit string. Additionally, when receiving data, the baseband processing unit 1h-20 can restore the received bit stream by demodulating and decoding the baseband signal provided from the RF processing unit 1h-10. For example, in the case of OFDM, when transmitting data, the baseband processing unit 1h-20 generates complex symbols by encoding and modulating the transmission bit string, maps the complex symbols to subcarriers, and performs IFFT operation and OFDM symbols can be configured through CP insertion. In addition, when receiving data, the baseband processing unit 1h-20 divides the baseband signal provided from the RF processing unit 1h-10 into OFDM symbols, restores the signals mapped to subcarriers through FFT operation, and then , the received bit string can be restored through demodulation and decoding. The baseband processing unit 1h-20 and the RF processing unit 1h-10 may transmit and/or receive signals as described above. Accordingly, the baseband processing unit 1h-20 and the RF processing unit 1h-10 may be referred to as a transmitting unit, a receiving unit, a transceiving unit, a communication unit, or a wireless communication unit. The base station may transmit and/or receive signals to and from the terminal using the baseband processing unit 1h-20 and the RF processing unit 1h-10, and the signals may include control information and data.

The backhaul communication unit 1h-30 can provide an interface for communicating with other nodes in the network. In other words, the backhaul communication unit 1h-30 converts a bit string transmitted from the main base station to other nodes (e.g., auxiliary base station, core network, etc.) into a physical signal, and converts the physical signal received from other nodes into a bit string. can do. The backhaul communication unit (1m-30) may be included in the communication unit.

The storage unit 1h-40 can store data such as basic programs, application programs, and setting information for operation of the main base station. In particular, the storage unit 1h-40 can store information about bearers assigned to the connected terminal, measurement results reported from the connected terminal, etc. Additionally, the storage unit 1h-40 may store information that serves as a criterion for determining whether to provide or suspend multiple connections to the terminal. Additionally, the storage unit 1h-40 may provide stored data upon request from the control unit 1h-50. The storage unit 1m-40 may be composed of a storage medium such as ROM, RAM, hard disk, CD-ROM, and DVD, or a combination of storage media. Additionally, the storage unit 1m-40 may be composed of a plurality of memories.

The control unit 1h-50 can control the overall operations of the main base station. For example, the control unit 1h-50 may transmit and/or receive signals through the baseband processing unit 1h-20 and the RF processing unit 1h-10 or through the backhaul communication unit 1h-30. Additionally, the control unit 1h-50 writes and reads data into the storage unit 1h-40. For this purpose, the control unit 1h-50 may include at least one processor. Additionally, at least one component of the base station may be implemented with one chip.

Methods according to embodiments described in the claims or specification of the present disclosure may be implemented in the form of hardware, software, or a combination of hardware and software.

When implemented as software, a computer-readable storage medium that stores one or more programs (software modules) may be provided. One or more programs stored in a computer-readable storage medium are configured to be executable by one or more processors in an electronic device (configured for execution). One or more programs include instructions that cause the electronic device to execute methods according to embodiments described in the claims or specification of the present disclosure.

These programs (software modules, software) include random access memory, non-volatile memory including flash memory, read only memory (ROM), and electrically erasable programmable ROM. (EEPROM: Electrically Erasable Programmable Read Only Memory), magnetic disc storage device, Compact Disc-ROM (CD-ROM: Compact Disc-ROM), Digital Versatile Discs (DVDs), or other types of It can be stored in an optical storage device or magnetic cassette. Alternatively, it may be stored in a memory consisting of a combination of some or all of these. Additionally, multiple configuration memories may be included.

In addition, the program can be accessed through a communication network such as the Internet, Intranet, LAN (Local Area Network), WLAN (Wide LAN), or SAN (Storage Area Network), or a combination of these. It may be stored in an attachable storage device that can be accessed. This storage device can be connected to a device performing an embodiment of the present disclosure through an external port. Additionally, a separate storage device on a communication network may be connected to the device performing an embodiment of the present disclosure.

In the specific embodiments of the present disclosure described above, elements included in the disclosure are expressed in singular or plural numbers depending on the specific embodiment presented. However, singular or plural expressions are selected to suit the presented situation for convenience of explanation, and the present disclosure is not limited to singular or plural components, and even components expressed in plural may be composed of singular or singular. Even expressed components may be composed of plural elements.

Meanwhile, in the detailed description of the present disclosure, specific embodiments have been described, but of course, various modifications are possible without departing from the scope of the present disclosure. Therefore, the scope of the present disclosure should not be limited to the described embodiments, but should be determined not only by the scope of the patent claims described later, but also by the scope of this patent claim and equivalents. In other words, it is obvious to those skilled in the art that other modifications based on the technical idea of the present disclosure can be implemented. Additionally, each embodiment can be operated in combination with each other as needed. For example, a base station and a terminal can be operated by combining some of the methods proposed in this disclosure. Additionally, although the embodiments have been presented based on 5G and NR systems, other modifications based on the technical idea of the embodiments may also be implemented in other systems such as LTE, LTE-A, and LTE-A-Pro systems.

Claims (1)

In a method of operating a terminal in a wireless communication system,
Transmitting terminal capability information of the terminal to a base station;
Receiving a first message containing configuration information for reporting preference settings of the terminal from a base station that has received the terminal capability information;
Transmitting a second message containing preference settings of the terminal based on the setting information to a base station;
After receiving the first message, driving a first timer included in the first message; and
When the first timer expires, determining that the base station's response to the second message is rejected.

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