KR20210055547A - Apparatus and method for controlling qulaity of service for user equipment in wireless communication system - Google Patents

Abstract

The present invention relates to a 5th generation (5G) or pre-5G communication system for supporting a higher data rate after a 4th generation (4G) communication system such as Long Term Evolution (LTE). The present invention is for controlling the quality of service in a wireless communication system. The operating method of the base station may comprise the steps of: transmitting a first message to another base station; and receiving a second message from the other base station. The first message may include information informing whether the base station supports at least one of an alternative quality of service (QoS) profile function and a QoS flow establishment standby function.

Description

A device and method for controlling quality of service provided to a terminal in a wireless communication system {APPARATUS AND METHOD FOR CONTROLLING QULAITY OF SERVICE FOR USER EQUIPMENT IN WIRELESS COMMUNICATION SYSTEM}

The present disclosure generally relates to a wireless communication system, and more particularly, to an apparatus and method for controlling the quality of service provided to a terminal in a wireless communication system.

Efforts are being made to develop an improved 5G communication system or a pre-5G communication system in order to meet the increasing demand for wireless data traffic after the commercialization of 4G communication systems. For this reason, the 5G communication system or the pre-5G communication system is called a communication system after a 4G network (Beyond 4G Network) or a system after an LTE system (Post LTE). The 5G communication system defined by 3GPP is called the New Radio (NR) system. In order to achieve a high data rate, the 5G communication system is being considered for implementation in the ultra-high frequency (mmWave) band (eg, such as the 60 Giga (60 GHz) band). In order to mitigate the path loss of radio waves in the ultra-high frequency band and increase the transmission distance of radio waves, 5G communication systems include beamforming, massive MIMO, and Full Dimensional MIMO (FD-MIMO). ), array antenna, analog beam-forming, and large scale antenna techniques were discussed and applied to NR systems. In addition, in order to improve the network of the system, in 5G communication system, evolved small cell, advanced small cell, cloud radio access network (cloud RAN), ultra-dense network , Device to Device communication (D2D), wireless backhaul, moving network, cooperative communication, CoMP (Coordinated Multi-Points), and interference cancellation And other technologies are being developed. In addition, in 5G systems, advanced coding modulation (ACM) methods such as Hybrid FSK and QAM Modulation (FQAM) and SWSC (Sliding Window Superposition Coding), advanced access technologies such as Filter Bank Multi Carrier (FBMC), NOMA (non-orthogonal multiple access), and sparse code multiple access (SCMA) have been developed.

Meanwhile, the Internet is evolving from a human-centered connection network in which humans create and consume information, to an Internet of Things (IoT) network that exchanges and processes information between distributed components such as objects. IoE (Internet of Everything) technology, which combines IoT technology with big data processing technology through connection with cloud servers, etc., is also emerging. In order to implement IoT, technological elements such as sensing technology, wired/wireless communication and network infrastructure, service interface technology, and security technology are required. , M2M), and MTC (Machine Type Communication) technologies are being studied. In the IoT environment, intelligent IT (Internet Technology) services that create new value in human life by collecting and analyzing data generated from connected objects can be provided. IoT is the field of smart home, smart building, smart city, smart car or connected car, smart grid, healthcare, smart home appliance, advanced medical service, etc. through the convergence and combination of existing IT (Information Technology) technology and various industries. Can be applied to.

Accordingly, various attempts have been made to apply a 5G communication system to an IoT network. For example, 5G communication such as a sensor network, machine to machine (M2M), and machine type communication (MTC) is implemented by techniques such as beamforming, MIMO, and array antenna. The application of a cloud radio access network (cloud RAN) as the big data processing technology described above can be said as an example of the convergence of 5G technology and IoT technology.

As described above and with the development of a mobile communication system, various services can be provided, and thus, a method for effectively providing these services is required.

Based on the above discussion, the present disclosure provides an apparatus and method capable of effectively providing a service in a wireless communication system.

In addition, the present disclosure provides an apparatus and method for effectively controlling the quality of service provided to a terminal in a wireless communication system.

According to various embodiments of the present disclosure, a method of operating a terminal in a wireless communication system includes a process of transmitting a first message requesting establishment of a guaranteed bit rate (GBR) flow, and setting the GBR flow according to a state of the base station. If not supported, a process of receiving a second message including information notifying that the establishment of the GBR flow is in a standby state, and a process of performing an operation corresponding to that the establishment of the GBR flow is in a standby state may be included. .

An apparatus and method according to various embodiments of the present disclosure enable support of quality of service.

The effects obtainable in the present disclosure are not limited to the effects mentioned above, and other effects not mentioned may be clearly understood by those of ordinary skill in the technical field to which the present disclosure belongs from the following description. will be.

1 illustrates a wireless communication system according to various embodiments of the present disclosure.
2 illustrates a configuration of a base station in a wireless communication system according to various embodiments of the present disclosure.
3 illustrates a configuration of a terminal in a wireless communication system according to various embodiments of the present disclosure.
4 is a diagram illustrating a configuration of a core network device in a wireless communication system according to various embodiments of the present disclosure.
5 illustrates an example of a procedure for processing a GBR flow in a wireless communication system according to various embodiments of the present disclosure.
6 illustrates another example of a procedure for processing a GBR flow in a wireless communication system according to various embodiments of the present disclosure.
7 illustrates another example of a procedure for processing a GBR flow in a wireless communication system according to various embodiments of the present disclosure.
8 illustrates another example of a procedure for processing a GBR flow in a wireless communication system according to various embodiments of the present disclosure.
9 illustrates another example of a procedure for processing a GBR flow in a wireless communication system according to various embodiments of the present disclosure.

Terms used in the present disclosure are only used to describe a specific embodiment, and may not be intended to limit the scope of other embodiments. Singular expressions may include plural expressions unless the context clearly indicates otherwise. Terms used herein, including technical or scientific terms, may have the same meaning as commonly understood by a person of ordinary skill in the technical field described in the present disclosure. Among the terms used in the present disclosure, terms defined in a general dictionary may be interpreted as having the same or similar meanings as those in the context of the related technology, and unless explicitly defined in the present disclosure, an ideal or excessively formal meaning Is not interpreted as. In some cases, even terms defined in the present disclosure cannot be interpreted to exclude embodiments of the present disclosure.

In various embodiments of the present disclosure described below, a hardware approach is described as an example. However, since various embodiments of the present disclosure include technology using both hardware and software, various embodiments of the present disclosure do not exclude a software-based approach.

Hereinafter, the present disclosure relates to an apparatus and method for controlling quality of service in a wireless communication system. Specifically, the present disclosure describes a technique for controlling the quality of service provided to a terminal in a wireless communication system.

In the following description, a term referring to a signal, a term referring to a channel, a term referring to control information, a term referring to network entities, a term referring to a component of a device, etc. are for convenience of description. It is illustrated. Accordingly, the present disclosure is not limited to terms to be described later, and other terms having an equivalent technical meaning may be used.

In addition, although the present disclosure describes various embodiments using terms used in some communication standards (eg, 3rd Generation Partnership Project (3GPP)), this is only an example for description. Various embodiments of the present disclosure may be easily modified and applied to other communication systems.

That is, in describing the following embodiments in detail, the present disclosure describes a wireless access network for which a 5G network standard is determined by 3GPP, an NG-RAN, which is a core network, and a packet core (5G system or 5G Core Network) as main targets. However, the main gist of the present disclosure can be applied to other communication systems having a similar technical background with slight modifications without significantly departing from the scope of the present disclosure, which has a skilled technical knowledge in the technical field of the present disclosure. It will be possible at your own discretion.

1 illustrates a wireless communication system according to various embodiments of the present disclosure.

Referring to FIG. 1, a wireless communication system includes a radio access network (RAN) 102 and a core network (CN) 104.

The wireless access network 102 is a network directly connected to a user device, for example, the terminal 120, and is an infrastructure that provides wireless access to the terminal 120. The radio access network 102 includes a set of a plurality of base stations including the base station 110, and the plurality of base stations may perform communication through an interface formed therebetween. At least some of the interfaces between the plurality of base stations may be wired or wireless. The base station 110 and 110 may have a structure divided into a central unit (CU) and a distributed unit (DU). In this case, one CU can control a plurality of DUs. In addition to a base station, the base station 110 includes'access point (AP)','next generation node B (gNB)', '5th generation node', and'wireless point'. ,'Transmission/reception point (TRP)', or another term having an equivalent technical meaning. The terminal 120 accesses the radio access network 102 and communicates with the base station 110 through a radio channel. Terminal 120 is a terminal other than'user equipment (UE)','mobile station','subscriber station','remote terminal','wireless terminal' It may be referred to as'(wireless terminal)','user device', or another term having an equivalent technical meaning.

The core network 104 is a network that manages the entire system, controls the radio access network 102, and processes data and control signals for the terminal 120 transmitted and received through the radio access network 102. The core network 104 is a control of a user plane and a control plane, mobility processing, subscriber information management, billing, and other types of systems (e.g., a long term evolution (LTE) system). ) And performs various functions. In order to perform the various functions described above, the core network 104 may include a plurality of functionally separated entities having different network functions (NFs). For example, the core network 104 may include an access and mobility management function (AMF) 130a, a session management function (SMF) 130b, and user data management (UDM) 130c. The listed functional objects may be implemented with at least one hardware device (eg, a server). When functions of a plurality of functional objects are performed in one device, the plurality of functional objects may be implemented by a plurality of virtual machines.

The AMF 130a provides functions for access and mobility management in units of terminals. For example, the AMF (130a) is signaling between NOR network objects for mobility between 3GPP access networks, termination of a control plane (CP) interface of a wireless access network, termination of NAS signaling, and NAS signaling security (e.g.: NAS ciphering and integrity protection), AS security control, registration management (e.g., registration area management), connection management, idle mode terminal reachability (e.g., paging retransmission control and Implementation), mobility management control (e.g. subscription and policy), intra-system mobility and inter-system mobility support, support for network slicing, SMF selection, lawful intercept, session management between terminal and SMF (session management, SM) message delivery, transparent proxy for SM message routing, access authentication, access authorization including roaming authorization check, SMS message between terminal and SMSF It is possible to support functions such as delivery provision, security anchor function (SEA), security context management (SCM), and the like. Some or all functions of the AMF 130a may be supported within a single instance of one AMF 130a.

SMF (130b) provides a session management function. When the terminal has a plurality of sessions, the sessions may be managed by different SMFs 130b. For example, the SMF 130b manages sessions (eg, establishes, modifies, and releases sessions, including maintaining a tunnel between UPF and AN nodes), allocating and managing terminal IP addresses, and selecting user plane (UP) functions. And control, setting traffic steering to route traffic from the UPF to an appropriate destination, termination of interfaces to policy control functions, enforcement of the control part of policy and quality of service (QoS), and legitimate interception (lawful intercept) (e.g., for SM events and interfaces to the LI system), termination of the SM part of the NAS message, downlink data notification, initiator of AN specific SM information, determination of the SSC mode of the session And roaming functions. Some or all functions of the SMF 130b may be supported within a single instance of one SMF 130b.

The UDM 130c stores user subscription data, policy data, and the like. The UDM may include an application front end and a user data repository (UDR). Data stored in the UDR may include user subscription data and policy data including subscription identifiers, security credentials, access and mobility-related subscription data, and session-related subscription data.

Hereinafter, in various embodiments of the present disclosure, a function provided by any one of the aforementioned NFs may be referred to as a'service'. In addition, one instance may support one or more services. If each service is implemented in the form of an identifiable instance, the service may be referred to as a'service instance'. Service instances providing the same service can be grouped into a service set. Service instances belonging to one service set may exchange or share context with each other and provide the same service. In addition, instances providing the same service may form a set together, and instances belonging to one set may exchange or share contexts with each other and provide the same service. In addition, between instances belonging to the same service set or set, service continuity or IP address preservation for the terminal is supported even when the service or instance changes according to the mobility or network state change of the terminal. Can be.

Instances are objects that can be identified by realizing the NF defined in the 3GPP standard. That is, the instance may be understood as a hardware device implemented to perform an operation for at least one service and transmit and receive information. Thus, an instance may be referred to as a'device' or a'node'. That is, a device or node can be understood as an instance in a virtualized system. One may support more than one service, and each service may also be realized, so that it may be separated and implemented into at least one service instance in an identifiable form. If is implemented as an instance, the service instance can be included in the instance. Accordingly, in describing various embodiments of the present disclosure, terms such as'instance','service instance','device', and'node' may be used interchangeably.

Referring to FIG. 1, the terminal 120 is connected to the wireless access network 102 and can access a device that performs a mobility management function (MMF) of a 5G core network device. For example, the device that performs MMF may be the AMF (130a). The AMF 130a may refer to a function or device that is responsible for both access of the wireless access network 102 and mobility management of the terminal 120. The SMF 130b performs a session management function. The AMF 130a is connected to the SMF 130b, and the AMF 130a may route a session-related message to the terminal 120 to the SMF 130b. The SMF 130b may establish a tunnel for transmitting data between the base station 110 and the UPF by allocating a user plane resource to be provided to the terminal in connection with a user plane function (UPF). The PCF 130c may control QoS policy and charging-related information for the QoS flow of the PDU session used by the terminal 120. The PCF (130c) constructs the PCC rule as described above and then transfers it to the SMF (130b), and the SMF (130b) provides a QoS profile to the wireless access network 102 based on this, and The access network 102 may allocate radio resources to the terminal 120 according to the QoS profile.

2 illustrates a configuration of a base station in a wireless communication system according to various embodiments of the present disclosure. The configuration illustrated in FIG. 2 can be understood as the configuration of the base station 110. Terms such as'?? unit' and'?? group' used hereinafter refer to units that process at least one function or operation, which may be implemented by hardware or software, or a combination of hardware and software.

Referring to FIG. 2, the base station includes a wireless communication unit 210, a backhaul communication unit 220, a storage unit 230, and a control unit 240.

The wireless communication unit 210 performs functions for transmitting and receiving signals through a wireless channel. For example, the wireless communication unit 210 performs a function of converting between a baseband signal and a bit stream according to the physical layer standard of the system. For example, when transmitting data, the wireless communication unit 210 generates complex symbols by encoding and modulating a transmission bit stream. In addition, when receiving data, the wireless communication unit 210 restores the received bit stream through demodulation and decoding of the baseband signal.

In addition, the wireless communication unit 210 up-converts the baseband signal into a radio frequency (RF) band signal and then transmits it through an antenna, and down-converts the RF band signal received through the antenna into a baseband signal. To this end, the wireless communication unit 210 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), and the like. In addition, the wireless communication unit 210 may include a plurality of transmission/reception paths. Furthermore, the wireless communication unit 210 may include at least one antenna array composed of a plurality of antenna elements.

In terms of hardware, the wireless communication unit 210 may be composed of a digital unit and an analog unit, and the analog unit includes a plurality of sub-units according to operation power, operation frequency, etc. It can be composed of. The digital unit may be implemented with at least one processor (eg, a digital signal processor (DSP)).

The wireless communication unit 210 transmits and receives signals as described above. Accordingly, all or part of the wireless communication unit 210 may be referred to as a'transmitter', a'receiver', or a'transceiver'. In addition, in the following description, transmission and reception performed through a wireless channel is used in a sense including the processing as described above is performed by the wireless communication unit 210.

The backhaul communication unit 220 provides an interface for performing communication with other nodes in the network. That is, the backhaul communication unit 220 converts the bit stream transmitted from the base station to another node, for example, another access node, another base station, an upper node, a core network, etc., into a physical signal, and converts the physical signal received from the other node. Convert to bit string.

The storage unit 230 stores data such as a basic program, an application program, and setting information for the operation of the base station. The storage unit 230 may be formed of a volatile memory, a nonvolatile memory, or a combination of a volatile memory and a nonvolatile memory. In addition, the storage unit 230 provides stored data according to the request of the control unit 240.

The control unit 240 controls overall operations of the base station. For example, the control unit 240 transmits and receives signals through the wireless communication unit 210 or through the backhaul communication unit 220. In addition, the control unit 240 writes and reads data in the storage unit 230. In addition, the control unit 240 may perform functions of a protocol stack required by a communication standard. According to another implementation example, the protocol stack may be included in the wireless communication unit 210. To this end, the control unit 240 may include at least one processor. According to various embodiments, the control unit 240 may control the base station to perform operations according to various embodiments to be described later.

3 illustrates a configuration of a terminal in a wireless communication system according to various embodiments of the present disclosure. The configuration illustrated in FIG. 3 may be understood as the configuration of the terminal 120. Terms such as'?? unit' and'?? group' used hereinafter refer to units that process at least one function or operation, which may be implemented by hardware or software, or a combination of hardware and software.

Referring to FIG. 3, the terminal includes a communication unit 310, a storage unit 320, and a control unit 330.

The communication unit 310 performs functions for transmitting and receiving signals through a wireless channel. For example, the communication unit 310 performs a function of converting between a baseband signal and a bit stream according to the physical layer standard of the system. For example, when transmitting data, the communication unit 310 generates complex symbols by encoding and modulating a transmission bit stream. In addition, when receiving data, the communication unit 310 restores the received bit stream through demodulation and decoding of the baseband signal. In addition, the communication unit 310 up-converts the baseband signal into an RF band signal and then transmits it through an antenna, and down-converts the RF band signal received through the antenna into a baseband signal. For example, the communication unit 310 may include a transmission filter, a reception filter, an amplifier, a mixer, an oscillator, a DAC, an ADC, and the like.

In addition, the communication unit 310 may include a plurality of transmission/reception paths. Furthermore, the communication unit 310 may include at least one antenna array composed of a plurality of antenna elements. In terms of hardware, the communication unit 310 may include a digital circuit and an analog circuit (eg, radio frequency integrated circuit (RFIC)). Here, the digital circuit and the analog circuit may be implemented in one package. In addition, the communication unit 310 may include a plurality of RF chains. Furthermore, the communication unit 310 may perform beamforming.

The communication unit 310 transmits and receives signals as described above. Accordingly, all or part of the communication unit 310 may be referred to as a'transmitting unit', a'receiving unit', or a'transmitting/receiving unit'. In addition, in the following description, transmission and reception performed through a wireless channel is used in a sense including the processing as described above is performed by the communication unit 310.

The storage unit 320 stores data such as a basic program, an application program, and setting information for the operation of the terminal. The storage unit 320 may be formed of a volatile memory, a nonvolatile memory, or a combination of a volatile memory and a nonvolatile memory. In addition, the storage unit 320 provides stored data according to the request of the control unit 330.

The controller 330 controls overall operations of the terminal. For example, the control unit 330 transmits and receives signals through the communication unit 310. In addition, the control unit 330 writes and reads data in the storage unit 320. In addition, the control unit 330 may perform functions of the protocol stack required by the communication standard. To this end, the controller 330 may include at least one processor or a micro processor, or may be a part of a processor. In addition, a part of the communication unit 310 and the control unit 330 may be referred to as a communication processor (CP). According to various embodiments, the controller 330 may control the terminal to perform operations according to various embodiments to be described later.

4 is a diagram illustrating a configuration of a core network device in a wireless communication system according to various embodiments of the present disclosure. The structure illustrated in FIG. 4 may be understood as a configuration of a device having at least one function of the AMF 130a, SMF 130b, and PCF 130c of FIG. 1. Terms such as'?? unit' and'?? group' used hereinafter refer to units that process at least one function or operation, which may be implemented by hardware or software, or a combination of hardware and software.

Referring to FIG. 4, the core network device includes a communication unit 410, a storage unit 420, and a control unit 430.

The communication unit 410 provides an interface for performing communication with other devices in the network. That is, the communication unit 410 converts a bit stream transmitted from a core network device to another device into a physical signal, and converts a physical signal received from another device into a bit stream. That is, the communication unit 410 may transmit and receive signals. Accordingly, the communication unit 410 may be referred to as a modem, a transmitter, a receiver, or a transceiver. In this case, the communication unit 410 enables the core network device to communicate with other devices or systems through a backhaul connection (eg, wired backhaul or wireless backhaul) or through a network.

The storage unit 420 stores data such as a basic program, an application program, and setting information for the operation of the core network device. The storage unit 420 may be formed of a volatile memory, a nonvolatile memory, or a combination of a volatile memory and a nonvolatile memory. In addition, the storage unit 420 provides stored data according to the request of the control unit 430.

The controller 430 controls overall operations of the core network device. For example, the control unit 430 transmits and receives signals through the communication unit 410. In addition, the control unit 430 writes and reads data in the storage unit 420. To this end, the control unit 430 may include at least one processor. According to various embodiments, the controller 430 may control the core network device to perform operations according to various embodiments described later.

Each of the NFs defines the services they provide, which are defined in the standard as Npcf, Nsmf, Namf, Nnef, etc. For example, when the AMF delivers a session-related message to the SMF, a service called'Nsmf_PDUSession_CreateSMContext' or an application programming interface (API) can be used.

According to an embodiment of the present disclosure, the base station notifies the 5G core network of the QoS level of a radio bearer that can be supported to the terminal, and the 5G core network is based on this PDU ( protocol data unit) The QoS flow of the session can be changed or added. According to an embodiment, when the wireless condition worsens and the QoS level that can be provided to the terminal is lowered, the base station may induce the application of a QoS flow of a lower QoS level by notifying the 5G core network. In addition, when the QoS level that can be provided to the terminal is increased due to the improvement of the wireless situation, the base station can induce the application of a QoS flow of a better QoS level by notifying the 5G core network.

According to various embodiments, the third-party application server may determine which QoS level the UE currently uses according to the QoS level negotiated with the 5G core network, and change the level of the service provided to the UE. . For example, the application server providing the autonomous driving service may adjust the level of automation according to the QoS level currently used by the terminal. Accordingly, the application server may change the autonomous driving mode from a fully autonomous driving mode to a driver intervention mode, or from a driver intervention mode to a fully autonomous driving mode.

According to an embodiment, when a GBR (guaranteed bit rate) QoS flow is required for a PDU session used by a terminal, an event for monitoring a QoS level currently supported by the terminal may be set in the base station. Based on this, the base station can determine the QoS level that can be provided to the terminal and inform the core network.

According to an embodiment, when a terminal performs handover to another base station, the target base station checks QoS level monitoring information set for the corresponding terminal, and determines a QoS level that the target base station can support, It can inform the core network.

In describing the embodiments of the present disclosure in detail, 3GPP will mainly target a radio access network for which a 5G network standard is defined, an NG-RAN, which is a core network, and a packet core (5G system, or 5G Core Network). The gist may be applied to other communication systems having a similar technical background with slight modifications without significantly departing from the scope of the present disclosure, which will be possible by judgment of a person skilled in the technical field of the present disclosure.

Hereinafter, for convenience of description, some terms and names defined in the 3rd generation partnership project long term evolution (3GPP) standard may be used. However, the present disclosure is not limited by the above-described terms and names, and may be equally applied to systems conforming to other standards.

Description of entities appearing in the present disclosure is as follows.

A user equipment (UE) is connected to a radio access network (RAN) and can access a device that performs a mobility management function of a 5G core network device. In the present disclosure, by way of example, the above-described device will be referred to as an access and mobility management function (AMF). The above-described device may refer to a function or device that is responsible for both access of a radio access network (RAN) and mobility management of a terminal. A session management function (SMF) may be a name of a network function that performs a session management function. The AMF is connected to the SMF, and the AMF can route a session-related message to the terminal to the SMF. The SMF may establish a tunnel for transmitting data between the base station and the UPF by allocating user plane resources to be provided to the terminal by connecting with a user plane function (UPF). PCF (policy and charging function) is an abbreviation of Policy & Charging Function, and can control QoS policy and billing-related information for a QoS (quality of service) flow of a protocol data unit (PDU) session used by the terminal. The PCF constructs a policy and charging control (PCC) rule as described above and delivers it to the SMF, and the SMF provides a QoS profile to the RAN based on this, and the RAN provides a radio for the terminal according to the QoS (quaility of service) profile. Resources can be allocated.

Each NF (network function) defines the services they provide, which are defined in the standard as Npcf, Nsmf, Namf, Nnef, etc. For example, when the AMF delivers a session-related message to the SMF, a service called Nsmf_PDUSession_CreateSMContext (or an application programming interface (API)) can be used.

In the present invention, the user terminal may receive a service through a specific QoS, and the QoS for the service may be variably set according to a network condition, subscription information, a wireless access condition, and a request from an AF (or service provider).

QoS provided to the user terminal may be controlled in units of QoS flow, which is a set of IP (or service) flows to which the same QoS processing and parameters are applied. In this case, one QoS profile (a set of QoS parameters and setting values to be applied to the QoS flow) may be applied to one QoS flow.

Meanwhile, the following embodiments will be described on the basis of 5GS (5G Core and NG-RAN, 5G supporting terminal), but the same subject matter of the invention can be applied to a 4G system. At this time, the new generation-radio access network (NG-RAN) is an evolved universal terrestrial access network (E-UTRAN), the AMF is a mobility management entity (MME), and the SMF is a serving gateway (S/PGW), a packet data network gateway. ), PCF may be changed to a policy and charging rules function (PCF), and user data management (UDM) may be changed to a home subscriber server (HSS).

<Example 1>

If the GBR flow configuration requested by the user equipment (UE) does not immediately support the configuration of the requested GBR flow according to the state of the base station (load state, radio access state, etc.) for the GBR (guaranteed bit rate) flow (hereinafter referred to as GBR QoS flow) Establishment Wait: This is an embodiment of a method of processing GBR QoS Flow Pended or Queued).

5 illustrates an example of a procedure for processing a GBR flow in a wireless communication system according to various embodiments of the present disclosure.

5, in step 1, the UE transmits a PDU session modification request message to the AMF. In other words, the UE transmits a PDU session modification request to add a GBR flow. This message includes parameters (GBR, 5QI (5G QoS indicator), etc.) for adding a GBR flow.

In step 2, the SMF performs a PDU session update process. In other words, the AMF performs a process for processing the QoS flow requested by the terminal. During this process, the request from the UE is transferred to the SMF, and the SMF determines whether to transfer additional QoS parameters to the NG-RAN instead of the QoS parameters requested by the UE according to the subscription information received from the UDM and the policy received from the PCF. An additional QoS profile may be received, and an indication indicating whether to support GBR QoS flow establishment standby for a currently requested subscriber/service may be received. This information may be transmitted from the SMF to the AMF, or may be included in the subscription information received by the AMF from the UDM or the policy received from the PCF.

In step 3, the AMF transmits an N2 session request message to the NG-RAN. In other words, the AMF requests the NG-RAN to apply a QoS parameter or a QoS profile to be applied to the terminal. In this case, the AMF may include information indicating whether to support the additional QoS profile described in step 2 or standby for establishing a GBR QoS flow for the current subscriber/service.

In step 4, the NG-RAN determines whether to apply GBR flow addition wait. In other words, the NG-RAN determines whether it is possible to support the requested QoS flow according to the request of the AMF. If it is difficult for the NG-RAN to support the immediately requested QoS flow, it may decide to wait for establishment of a GBR QoS flow (in this case, whether to support standby for establishment of a GBR QoS flow received in step 3 may be considered).

In step 5, the NG-RAN transmits a radio resource control connection reconfiguration (RRC) message to the UE. In other words, the NG-RAN delivers information indicating that the GBR QoS flow establishment requested by the UE is in a standby state through a radio resource control (RRC) connection reconfiguration message transmitted to the UE. In this case, the message may include a QoS parameter requested by the terminal or adjusted or a session management (SM) container containing the same. In addition, a timer value for which the GBR QoS flow establishment standby state is to be continued can be transmitted together.

In step 6, the UE transmits a radio resource control (RRC) connection reconfiguration Ack (acknowledgement) message to the NG-RAN. In other words, the terminal delivers the Ack for the received RRC message. If a timer is received in step 5, the timer is started.

In step 7, the NG-RAN transmits an N2 session response message to the AMF. In other words, the NG-RAN delivers a list of QoS flows generated by AMF. At this time, even if a waiting for establishment of a GBR QoS flow is applied, the requested GBR QoS flow is included in the creation flow list. Each QoS flow may include an indication notifying that the GBR QoS flow establishment standby has been applied, or a list of flows to which the GBR QoS flow establishment standby has been applied may be separately transmitted.

In step 8, the AMF informs that the QoS standby has been applied to another network function (NF). In other words, when the AMF determines that the GBR QoS flow establishment standby is applied from the NG-RAN, it may inform other NFs such as SMF and PCF. This can be done through a message delivered as part of the PDU session modification procedure triggered in step 2, or through a separate notification, and at this time, the current location information of the UE (tracking area identity (TAI), Cell ID, NG- RAN ID, etc.) may be included.

In step 9, the UE may inform a higher layer that it is in a standby state for establishing a GBR QoS flow. In other words, as a result of the QoS flow generation, the terminal may inform the upper layer that the GBR QoS flow is in a standby state. Through this, it is possible to trigger an operation for QoS processing in a service application, display a notification to a user, or trigger an operation such as causing a transition to another radio access technology (RAT). More specifically, the terminal may temporarily transmit the media (or data) to be transmitted through the GBR QoS flow through the Non-GBR QoS flow instead. To this end, the terminal may temporarily change the IP address or port number to which the media (or data) is transmitted, and the codec, compression rate, transmission rate, or transmission rate of the media (or data) to suit the characteristics of the Non-GBR QoS flow. /You can also switch the protocol of the media layer. This operation is non-GBR QoS if the transmission of the GBR QoS flow becomes possible, i.e., when a signaling notifying that the GBR QoS flow has been established is explicitly received, or when the GBR value of the GBR QoS flow is updated to the requested value. Since the flow is switched back to the GBR QoS flow, media (or data) transmission/reception may be performed. For this process, the terminal uses application function (AF) (or IP multimedia subsystem (IMS) server) and signaling (session initiation protocol (SIP) for IMS, and hypertext transfer protocol (HTTP) for general service applications). It is possible to exchange and update information such as the changed media, QoS, and codec. A specific example of the IMS server referred to in the present invention may be one of P-CSCF, IMS-AWG, IMS-ALG, and S-CSCF, and AF is a general service application server (web server, content server, edge computing server, etc.) In addition, it can be one of TAS (Telephony Application Server).

In step 10, the UE may determine whether to fail to establish a GBR flow when the timer expires. In other words, if the waiting for GBR QoS flow establishment is released until the timer started in step 6 expires, or if a message indicating that the requested GBR QoS parameter has been updated is not received, the terminal considers that the GBR QoS flow establishment has failed. And, it can be notified to the upper layer.

In the present embodiment, if the terminal requests a GBR flow during the process of creating a PDU session, the same can be applied during the process of establishing a PDU session rather than modifying a PDU session.

<Example 2>

If the GBR flow configuration requested by the terminal cannot be supported immediately according to the state of the base station (load state, radio access state, etc.), this is a standby (hereinafter referred to as GBR QoS flow establishment standby). This is an example.

6 illustrates another example of a procedure for processing a GBR flow in a wireless communication system according to various embodiments of the present disclosure.

6, in step 1, the UE transmits a PDU session modification request message to the AMF. In other words, the UE transmits a PDU session modification request message to add a GBR flow. This message includes parameters (GBR, 5QI, etc.) for adding a GBR flow.

In step 2, the SMF performs a PDU session update process. In other words, the AMF performs a process for processing the QoS flow requested by the terminal. During this process, the request of the UE is transferred to the SMF, and the SMF determines whether to transfer additional QoS parameters to the NG-RAN instead of the QoS parameters requested by the UE according to the subscription information received from the UDM and the policy received from the PCF, In this case, an additional QoS profile to be used may be received, and an indication indicating whether to support GBR QoS flow establishment standby for the currently requested subscriber/service may be received. This information may be transmitted from the SMF to the AMF, or may be included in the subscription information received by the AMF from the UDM or the policy received from the PCF.

In step 3, the AMF transmits an N2 session request message to the NG-RAN. In other words, the AMF requests the NG-RAN to apply a QoS parameter or a QoS profile to be applied to the terminal. In this case, the AMF may include information indicating whether to support the additional QoS profile described in step 2 or standby for establishing a GBR QoS flow for the current subscriber/service.

In step 4, the NG-RAN determines whether to apply GBR flow addition wait. In other words, the NG-RAN determines whether the QoS flow requested by the AMF is supported. If it is difficult for the NG-RAN to support the immediately requested QoS flow, it may decide to wait for establishment of a GBR QoS flow (in this case, whether to support standby for establishment of a GBR QoS flow received in step 3 may be considered).

In step 5, the NG-RAN transmits an N2 session response message to the AMF. In other words, the NG-RAN delivers the list of generated QoS flows to the AMF. At this time, even if the GBR QoS flow establishment standby is applied, the requested GBR QoS flow is included in the generation flow list. Each QoS flow may include an indication notifying that the GBR QoS flow establishment standby has been applied, or a list of flows to which the GBR QoS flow establishment standby has been applied may be separately transmitted.

In step 6, the AMF may inform other NFs that the QoS flow is in standby. The AMF delivers information indicating that the GBR QoS flow establishment requested by the terminal is in a standby state in the PDU session modification command message transmitted to the terminal. This message is delivered to the terminal through an RRC message. In this case, the message may include a QoS parameter or an adjusted parameter requested by the terminal. In addition, a timer value for which the GBR QoS flow establishment standby state is to be continued can be transmitted together. The terminal receiving this starts the timer if the timer is received.

In step 7, the AMF transmits a PDU session modification response message to the UE. In other words, when the AMF determines that the GBR QoS flow establishment standby has been applied from the NG-RAN, it may inform other NFs such as SMF and PCF. This can be done through a message delivered as part of the PDU session modification procedure triggered in step 2, or through a separate notification, and at this time, the current location information of the terminal (TAI, Cell ID, NG-RAN ID, etc.) Can be included.

In step 8, the terminal may instruct a higher layer to wait for GBR flow establishment. In other words, as a result of the QoS flow generation, the terminal may inform the upper layer that the GBR QoS flow is in a standby state. Through this, it is possible to trigger an operation for QoS processing in a service application, display a notification to a user, or trigger an operation such as causing a transition to another RAT. More specifically, the terminal may temporarily transmit media (or data) to be transmitted through the GBR QoS flow through the Non-GBR QoS flow instead. To this end, the terminal may temporarily change the IP address or port number to which the media (or data) is transmitted, and the codec, compression rate, transmission rate, or transmission rate of the media (or data) to suit the characteristics of the non-GBR QoS flow. /You can also switch the protocol of the media layer. This operation is performed again to the GBR QoS flow if the transmission of the GBR QoS flow becomes possible, i.e., when a signaling notifying that the GBR QoS flow has been established is explicitly received or the GBR value of the GBR QoS flow is updated to the requested value. It can be switched to perform transmission and reception of media (or data). For this process, the terminal may exchange information such as the changed media, QoS, codec, etc. by exchanging signaling (SIP in the case of IMS or HTTP in the case of a general service application) with the AF (or IMS server).

In step 9, if the waiting for GBR QoS flow establishment is released until the timer started in step 6 expires, or if a message indicating that the requested GBR QoS parameter has been updated is not received, the terminal indicates that the GBR QoS flow establishment has failed. It can be considered, and it can be communicated to a higher layer.

<Example 3>

If the GBR flow requested by the terminal cannot be immediately supported according to the status of the base station (load status, wireless access status, etc.), the GBR flow is waiting (hereinafter referred to as GBR QoS flow establishment standby). Is as follows.

7 illustrates another example of a procedure for processing a GBR flow in a wireless communication system according to various embodiments of the present disclosure.

Referring to FIG. 7, in step 1, the UE transmits a PDU session modification request message to the AMF. In other words, the UE transmits a PDU session modification request message to add a GBR flow. This message includes parameters (GBR, 5QI, etc.) for adding a GBR flow.

In step 2, the SMF performs a PDU session update process. In other words, the AMF performs a process for processing the QoS flow requested by the terminal. During this process, the request of the UE is transferred to the SMF, and the SMF determines whether to transfer additional QoS parameters to the NG-RAN instead of the QoS parameters requested by the UE according to the subscription information received from the UDM and the policy received from the PCF, In this case, an additional QoS profile to be used may be received, and an indication indicating whether to support GBR QoS flow establishment standby for the currently requested subscriber/service may be received. This information may be transmitted from the SMF to the AMF, or may be included in the subscription information received by the AMF from the UDM or the policy received from the PCF.

In step 3, the AMF transmits an N2 session request message to the NG-RAN. In other words, the AMF requests the NG-RAN to apply a QoS parameter or a QoS profile to be applied to the terminal. In this case, the AMF may include information indicating whether to support the additional QoS profile described in step 2 or standby for establishing a GBR QoS flow for the current subscriber/service.

In step 4, the NG-RAN determines whether to apply a wait for GBR flow addition. In other words, the NG-RAN determines whether it is possible to support the QoS flow requested by the AMF. If it is difficult for the NG-RAN to support the immediately requested QoS flow, it may decide to wait for establishment of a GBR QoS flow (in this case, whether to support standby for establishment of a GBR QoS flow received in step 3 may be considered). At this time, when it is determined to wait for GBR QoS flow establishment, this can be expressed implicitly by setting the GBR value to 0.

In step 5, the NG-RAN transmits an RRC connection reconfiguration message to the UE. In other words, the NG-RAN delivers that the GBR value for the GBR QoS flow requested by the terminal is 0 through the RRC connection reconfiguration message transmitted to the terminal. In addition, a GBR QoS flow establishment standby state or a timer value for which a GBR value of 0 is maintained may be transmitted together.

In step 6, the UE transmits an RRC connection reconfiguration ACK message to the NG-RAN. In other words, the UE delivers the Ack for the received RRC message. If a timer is received in step 5, the timer is started.

In step 7, the NG-RAN transmits an N2 session response message to the AMF. In other words, the NG-RAN delivers a list of QoS flows generated by AMF, and in this case, even if a GBR QoS flow establishment standby (GBR = 0 in this embodiment) is applied, the requested GBR QoS flow is a generated flow list. Included in Each QoS flow may include an indication notifying that the GBR QoS flow establishment standby has been applied, or a list of flows to which the GBR QoS flow establishment standby has been applied may be separately transmitted.

In step 8, the AMF informs other NFs of waiting for a QoS flow. In other words, when the AMF finds that GBR = 0 is set from the NG-RAN, it may notify other NFs such as SMF and PCF that GBR is set to 0 or that the GBR QoS flow is in a standby state. This can be done through a message delivered as part of the PDU session modification procedure triggered in step 2, or through a separate notification, and at this time, the current location information of the terminal (TAI, Cell ID, NG-RAN ID, etc.) Can be included.

In step 9, if GBR = 0, the UE may instruct the upper layer to wait for GBR flow establishment. In other words, the terminal may inform the upper layer that the QoS flow generation result, the GBR QoS flow establishment standby state or the state set to GBR = 0. This may trigger an operation for QoS processing in a service application, raise a notification to a user, or trigger an operation such as causing a transition to another RAT. More specifically, the terminal may temporarily transmit the media (or data) to be transmitted through the GBR QoS flow through the Non-GBR QoS flow instead. To this end, the terminal may temporarily change the IP address or port number to which the media (or data) is transmitted, and the codec, compression rate, transmission rate, or transmission rate of the media (or data) to suit the characteristics of the non-GBR QoS flow. /You can also switch the protocol of the media layer. This operation is performed again as a GBR QoS flow if the transmission of the GBR QoS flow becomes possible, that is, when a signaling notifying that the GBR QoS flow has been established is explicitly received, or when the GBR value of the GBR QoS flow is updated to the requested value. It can be switched to perform transmission and reception of media (or data). For this process, the terminal may exchange information such as the changed media, QoS, codec, etc. by exchanging signaling (SIP in the case of IMS or HTTP in the case of a general service application) with the AF (or IMS server).

In step 10, the UE may determine whether to fail to establish a GBR flow when the timer expires. In other words, if the waiting for GBR QoS flow establishment is canceled until the timer started in step 6 expires, or if a message indicating that the requested GBR QoS parameter has been updated is not received, the terminal considers that the GBR QoS flow establishment has failed. And, it can be notified to the upper layer.

In the present embodiment, if the terminal requests a GBR flow during the process of creating a PDU session, the same can be applied during the process of establishing a PDU session rather than modifying a PDU session.

<Example 4>

If the GBR flow configuration requested by the terminal cannot be supported immediately according to the state of the base station (load state, wireless access state, etc.), it is supported after processing the standby (hereinafter referred to as waiting for establishment of GBR QoS flow). This is an example of how to do it.

8 illustrates another example of a procedure for processing a GBR flow in a wireless communication system according to various embodiments of the present disclosure.

Referring to FIG. 8, in step 0, a GBR flow is requested but is in a standby state. In other words, between the UE and the network, the GBR QoS flow is in a standby state for some QoS flows.

In step 1, the NG-RAN prepares to support the GBR flow. In other words, if the NG-RAN determines that the QoS provision (that is, the requested GBR) for the QoS flow waiting to establish the GBR QoS flow is enabled.

In step 2, the NG-RAN transmits an RRC connection reconfiguration message to the UE. In other words, the NG-RAN transmits an RRC message to inform the UE of the release of waiting for GBR QoS flow establishment, and this message includes an identifier (DRB ID or LCH (logical channel) of NG-RAN) that may indicate the corresponding QoS flow. ID) and an indication indicating that waiting for establishment of a GBR QoS flow has been released may be included.

In step 3, the UE transmits an RRC connection reconfiguration ACK message to the NG-RAN. In other words, the terminal transmits a response to the RRC message received in step 2.

In step 4, the NG-RAN notifies the GBR flow QoS update. In other words, the NG_RAN transmits information notifying that the wait for establishment of the GBR QoS flow has been released to the AMF, and the AMF receiving the information may notify other NFs such as SMF and PCF that the parameter for the GBR flow has been changed. In this case, the current location information (TAI, Cell ID, NG-RAN ID, etc.) of the terminal may be included.

In step 5, the UE indicates successful establishment of the GBR flow to the upper layer. In other words, as a result of the QoS flow generation, the UE may inform the upper layer that the GBR QoS flow establishment standby state has been released or that the requested GBR flow has been generated. This may trigger an operation for QoS processing in a service application, display a notification to a user, or trigger an operation of transmitting/receiving actual traffic. More specifically, the terminal can perform media (or data) transmission and reception through the GBR QoS flow, and for this process, the terminal can perform AF (or IMS server) and signaling (SIP in the case of IMS, or SIP in the case of a general service application, for example HTTP) can be exchanged to update information such as the changed media, QoS, and codec.

<Example 5>

If the GBR flow configuration requested by the UE is not immediately supported according to the state of the base station (load state, radio access state, etc.), it is supported after waiting (hereinafter referred to as waiting for establishment of GBR QoS flow). It is an example of.

9 illustrates another example of a procedure for processing a GBR flow in a wireless communication system according to various embodiments of the present disclosure.

Referring to FIG. 9, although a GBR flow is requested in step 0, it is in a standby state. In other words, between the UE and the network, the GBR QoS flow is in a standby state for some QoS flows.

In step 1, the NG-RAN is ready to support GBR flow. In other words, if the NG-RAN determines that QoS provision (ie, reset to the requested GBR value) is possible for the flow in which the GBR value is set to 0 among the GBR QoS flows.

In step 2, the NG-RAN transmits an RRC connection reconfiguration message to the UE. In other words, the NG-RAN transmits an RRC message to inform the terminal that the GBR QoS flow is reset to the requested GBR value, and this message includes an identifier (DRB ID of NG-RAN or LCH ID) and a GBR value requested by the terminal or an adjusted GBR value may be included. The GBR value set in this step is set to a value other than 0.

In step 3, the UE transmits an RRC connection reconfiguration ACK message to the NG-RAN. In other words, the terminal transmits a response to the RRC message received in step 2.

In step 4, the NG-RAN notifies the GBR flow QoS update. In other words, the NG-RAN delivers information notifying that GBR has been set to a value other than 0 for the QoS flow or information indicating that waiting for establishment of GBR QoS flow has been released, and the AMF receiving this information is the parameter for the GBR flow. Other NFs, such as SMF and PCF, can be informed of changes. In this case, the current location information (TAI, Cell ID, NG-RAN ID, etc.) of the terminal may be included.

In step 5, the UE instructs the upper layer to successfully establish the GBR flow. In other words, as a result of the QoS flow generation, the UE may inform the upper layer that the GBR value for the GBR QoS flow has been increased or that the requested GBR flow generation is completed. Through this, the service application can trigger an operation for QoS processing, display a notification to a user, or trigger an operation of transmitting/receiving actual traffic. As a result of the QoS flow generation, the UE may notify the upper layer that the GBR QoS flow establishment standby state has been released or that the requested GBR flow has been generated. This may trigger an operation for QoS processing in a service application, display a notification to a user, or trigger an operation of transmitting/receiving actual traffic. More specifically, the terminal can perform media (or data) transmission and reception through the GBR QoS flow, and for this process, the terminal can perform AF (or IMS server) and signaling (SIP in the case of IMS, and SIP in the case of a general service application, for example. HTTP) can be exchanged to update information such as the changed media, QoS, and codec.

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

When implemented in software, a computer-readable storage medium storing 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 (device). The one or more programs include instructions for causing 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. (electrically erasable programmable read only memory, EEPROM), magnetic disc storage device, compact disc-ROM (CD-ROM), digital versatile discs (DVDs) or other forms of It may be stored in an optical storage device or a magnetic cassette. Alternatively, it may be stored in a memory composed of a combination of some or all of them. In addition, a plurality of configuration memories may be included.

In addition, the program is a communication network such as the Internet (Internet), Intranet (Intranet), LAN (local area network), WAN (wide area network), or SAN (storage area network), or a communication network composed of a combination thereof. It may be stored in an accessible storage device. Such a storage device may access a device performing an embodiment of the present disclosure through an external port. In addition, a separate storage device on the communication network may access a device performing an embodiment of the present disclosure.

In the above-described specific embodiments of the present disclosure, components included in the disclosure are expressed in the singular or plural according to the presented specific embodiments. However, the singular or plural expression is selected appropriately for the situation presented for convenience of description, and the present disclosure is not limited to the singular or plural constituent elements, and even constituent elements expressed in plural are composed of the singular or in the singular. Even the expressed constituent elements may be composed of pluralities.

Meanwhile, although specific embodiments have been described in the detailed description of the present disclosure, various modifications may be made without departing from the scope of the present disclosure. Therefore, the scope of the present disclosure is limited to the described embodiments and should not be determined, and should be determined by the scope of the claims and equivalents as well as the scope of the claims to be described later.

Claims (1)

In the method of operating a terminal in a wireless communication system,
A process of transmitting a first message requesting establishment of a guaranteed bit rate (GBR) flow, and
When the GBR flow configuration is not supported according to the state of the base station, receiving a second message including information notifying that the establishment of the GBR flow is in a standby state, and
And performing an operation corresponding to that the establishment of the GBR flow is in a standby state.

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