WO2022157899A1

WO2022157899A1 - Network node, wireless communication system, and communication method

Info

Publication number: WO2022157899A1
Application number: PCT/JP2021/002107
Authority: WO
Inventors: 健一郎青▲柳▼; 昭宮坂; 尚人大久保; 太郎山田
Original assignee: 株式会社Ｎｔｔドコモ
Priority date: 2021-01-21
Filing date: 2021-01-21
Publication date: 2022-07-28

Abstract

This network node is provided with: a reception unit that receives a connection request of a communication bearer; and a control unit that determines whether to permit the connection request on the basis of the upper limit of the connection establishment number regarding the communication bearer. The control unit subtracts, in advance, a connection establishment number required for a specific type communication bearer from the upper limit of the connection establishment number.

Description

Network node, wireless communication system and communication method

The present invention relates to a network node and communication method in a wireless communication system.

In the 3GPP (3rd Generation Partnership Project), 5G or NR (New Radio) and NR (New Radio) are being used in order to further increase the system capacity, further increase the data transmission speed, and further reduce the delay in the wireless section. A wireless communication system called "5G" (hereinafter, the wireless communication system is referred to as "5G" or "NR") is under study. In 5G, various radio technologies are being studied in order to meet the requirements of realizing a throughput of 10 Gbps or more and keeping the delay in the radio section to 1 ms or less (for example, Non-Patent Document 1).

In NR, 5GC (5G Core Network) corresponding to EPC (Evolved Packet Core) which is the core network in LTE (Long Term Evolution) network architecture and E-UTRAN (RAN (Radio Access Network) in LTE network architecture ( A network architecture including NG-RAN (Next Generation-Radio Access Network) corresponding to Evolved Universal Terrestrial Radio Access Network) is under consideration (for example, Non-Patent Document 2).

In the base station or core network, there may be restrictions on the number of simultaneously connected bearers or the number of simultaneously connected QoS (Quality of Service) flows due to implementation. When the number of concurrently connected bearers or the number of concurrently connected QoS flows reaches the upper limit, and when a connection request for a voice emergency call is generated, there is a possibility that the call connection will be refused.

The present invention has been made in view of the above points, and aims to avoid connection refusal in response to a connection request for a specific service in a wireless communication system.

According to the disclosed technology, a receiving unit that receives a communication bearer connection request; The control unit is provided with a network node that preliminarily subtracts the number of connection establishments required for a specific type of communication bearer from the upper limit of the number of connection establishments.

According to the disclosed technique, it is possible to avoid connection refusal for a connection request for a specific service in a wireless communication system.

1 is a diagram for explaining an example of a communication system; FIG. FIG. 4 is a diagram for explaining an example of bearer setting according to the embodiment of the present invention; 4 is a flow chart for explaining an example of connection operation in the embodiment of the present invention; It is a figure showing an example of functional composition of base station 10 in an embodiment of the invention. 2 is a diagram showing an example of the functional configuration of terminal 20 according to the embodiment of the present invention; FIG. 2 is a diagram showing an example of hardware configuration of base station 10 or terminal 20 according to an embodiment of the present invention; FIG.

Embodiments of the present invention will be described below with reference to the drawings. In addition, the embodiment described below is an example, and the embodiment to which the present invention is applied is not limited to the following embodiment.

Existing technologies are appropriately used for the operation of the wireless communication system according to the embodiment of the present invention. However, the existing technology is, for example, existing LTE, but is not limited to existing LTE. In addition, the term “LTE” used in this specification has a broad meaning including LTE-Advanced and LTE-Advanced and subsequent systems (eg, NR) unless otherwise specified.

Further, in the embodiment of the present invention, the duplex system may be a TDD (Time Division Duplex) system, an FDD (Frequency Division Duplex) system, or other (for example, Flexible Duplex etc.) method may be used.

Further, in the embodiment of the present invention, "configure" parameters and the like may mean that predetermined values are set in advance (pre-configure), and base station 10, terminal 20 or parameters notified from the network node 30 may be set.

FIG. 1 is a diagram for explaining an example of a communication system. As shown in FIG. 1 , a communication system consists of a UE, which is a terminal 20 , and a plurality of network nodes 30 . Hereinafter, one network node 30 corresponds to each function, but one network node 30 may realize a plurality of functions, or a plurality of network nodes 30 may realize one function. . Also, the "connection" described below may be a logical connection or a physical connection.

A RAN (Radio Access Network) is a network node 30 having a radio access function, may include a base station 10, and is connected with a UE, an AMF (Access and Mobility Management Function) and a UPF (User plane function). The AMF is a network node 30 having functions such as RAN interface termination, NAS (Non-Access Stratum) termination, registration management, connection management, reachability management, and mobility management. The UPF is a network node 30 that has functions such as a PDU (Protocol Data Unit) session point to the outside that interconnects with a DN (Data Network), packet routing and forwarding, and user plane QoS (Quality of Service) handling. UPF and DN constitute a network slice. , in the wireless communication network according to the embodiments of the present invention, multiple network slices may be constructed.

AMF is UE, RAN, SMF (Session Management function), NSSF (Network Slice Selection Function), NEF (Network Exposure Function), NRF (Network Repository Function), UDM (Unified Data Management), AUSF (Authentication Server Function), PCF (Policy Control Function) and AF (Application Function) are connected. AMF, SMF, NSSF, NEF, NRF, UDM, AUSF, PCF, AF are interconnected via respective service-based interfaces Namf, Nsmf, Nnssf, Nnef, Nnrf, Nudm, Nausf, Npcf, Naf. network node 30 .

The SMF is a network node 30 that has functions such as session management, UE IP (Internet Protocol) address allocation and management, DHCP (Dynamic Host Configuration Protocol) function, ARP (Address Resolution Protocol) proxy, and roaming function. A NEF is a network node 30 that has the function of notifying other NFs (Network Functions) of capabilities and events. NSSF selects the network slice to which the UE connects, determines the allowed NSSAI (Network Slice Selection Assistance Information), determines the NSSAI to be set, determines the AMF set to which the UE connects. be.

A PCF is a network node 30 that has the function of performing network policy control. AF is a network node 30 having the function of controlling an application server. An NRF is a network node 30 that has the ability to discover NF instances that provide services. A UDM is a network node 30 that manages subscriber data and authentication data. The UDM is connected to a UDR (User Data Repository) that holds the data.

Here, in the base station 10 or core network, the number of simultaneously connected bearers or the number of simultaneously connected QoS (Quality of Service) flows may be limited due to implementation. That is, in the base station 10 or core network, there may be an upper limit to the number of E-RAB (E-UTRAN Radio Access Bearer) or QoS flow settings. Normally, when the number of E-RAB settings or the number of QoS flow settings reaches the upper limit, when an E-RAB setting request or QoS flow setting request is generated, the call connection by the setting request is rejected.

Therefore, when the number of simultaneously connected E-RABs or the number of simultaneously connected QoS flows reaches the upper limit, and if a connection request for a voice emergency call occurs, the call connection may be refused.

Therefore, in order to connect emergency calls and voice bearers, the number of bearers to be set may be previously set to an upper limit of -2 to limit the E-RABs that can be connected. Hereinafter, the description of bearer, communication bearer or E-RAB in EPC may be replaced with QoS flow in 5GC.

FIG. 2 is a diagram for explaining an example of bearer setting according to the embodiment of the present invention. As shown in Figure 2, the permanent E-RAB #1 corresponds to a specific service and is the default bearer. Permanent E-RAB#2 corresponds to IMS (IP Multimedia Subsystem) and is a default bearer. Permanent E-RAB#3 corresponds to requirement A and is the default bearer.

As shown in FIG. 2, E-RAB#4, which is set each time, corresponds to emergency calls and is the default bearer. E-RAB#5, which is set each time, corresponds to voice and is a dedicated bearer. E-RAB#6, which is set each time, corresponds to a specific service and is the default bearer. E-RAB#7, which is installed each time, corresponds to requirement A and is a dedicated bearer. E-RAB#8, which is set each time, corresponds to requirement C and is a dedicated bearer.

　The requirement may indicate, for example, that it is used to connect to another APN (Access Point Name). Note that the default bearer may be a best-effort bearer that does not guarantee quality, and the dedicated bearer is a bearer that can guarantee quality, such as GBR (Guaranteed Bit Rate). may be

As shown in Figure 2, E-RAB#4 emergency call and E-RAB#5 voice are reserved as reserved bearers. Also, if any one of the specific service of E-RAB # 6, requirement A of E-RAB # 7 and requirement C of E-RAB # 8 is set, do not accept other setting requests . That is, the upper limit number of E-RABs shown in FIG. 2 may be six.

As described above, by reserving an E-RAB for emergency calls and an E-RAB for voice, it is possible to avoid call connection refusal when an emergency call connection request occurs.

FIG. 3 is a flowchart for explaining an example of connection operation according to the embodiment of the present invention. At step S101, the network node 30 receives an E-RAB setup request. The network node 30 may be the base station 10 or any node of the core network. Note that the network node 30 may receive the E-RAB setup request from the terminal 20 or the base station 10. FIG.

In subsequent step S102, the network node 30 determines whether the E-RAB establishment number N is less than a predetermined number. If the E-RAB establishment number N is less than the predetermined number (YES in S102), the process proceeds to step S103, and if the E-RAB establishment number N is equal to or greater than the predetermined number (NO in S102), the process proceeds to step S104.

In step S103, the network node 30 determines that the E-RAB connection is OK, and sets N=N+1. That is, N is increased by one. On the other hand, in step S104, the network node 30 determines whether the E-RAB setup request is QCI (QoS Class Identifier) or ARP (Allocation and Retention Priority) corresponding to IMS voice or emergency call bearer. If it is QCI or ARP corresponding to IMS voice or emergency call bearer (YES in S104), proceed to step S103; if not QCI or ARP corresponding to IMS voice or emergency call bearer (NO in S104), proceed to step S105 . In step S105, the network node 30 determines that the E-RAB connection is NG, and sets N=N+0. That is, N is not increased or decreased.

In addition, the wireless communication system including the terminal 20, the base station 10, and the network node 30 according to the embodiment of the present invention uses a resource area for setting communication bearers of a predetermined type in advance before the number of communication bearer connections reaches the upper limit. is secured, and in a state where the number of communication bearers does not reach the upper limit of the number of connections, it is not necessary to set a communication bearer that does not correspond to the predetermined type of communication bearer.

Furthermore, the base station 10 according to the embodiment of the present invention may be capable of notifying the core network or the terminal 20 of information indicating the number of connections of communication bearers that can be set other than a predetermined type of communication bearer.

Furthermore, the network node 30 according to the embodiment of the present invention may be capable of notifying the base station 10 or the terminal 20 of information indicating the number of connections of communication bearers that can be set other than a predetermined type of communication bearer.

Furthermore, in the wireless communication system including the network node 30 according to the embodiment of the present invention, in response to a communication bearer setting request that does not correspond to a communication bearer of a predetermined type, in order to secure a resource area for establishing a communication bearer of a predetermined type , may respond with a message containing an information element indicating the failure.

Furthermore, the wireless communication system including the network node 30 according to the embodiment of the present invention secures a resource area for establishing a communication bearer of a predetermined type in response to a communication bearer setting request that does not correspond to a communication bearer of a predetermined type. MAY respond with a message containing an information element indicating that it failed because

Furthermore, the wireless communication system including the terminal 20, the base station 10, and the network node 30 according to the embodiment of the present invention, when the communication bearer reaches the upper limit of the number of connections, when a connection request for voice and emergency calls is generated, , may initiate the connection of voice and emergency calls after releasing the already connected communication bearer.

Furthermore, the wireless communication system including the terminal 20, the base station 10, and the network node 30 according to the embodiment of the present invention calculates the upper limit number of connection establishments based on the number of connection establishments required for communication bearers of a predetermined type. good too. Also, the wireless communication system including the terminal 20, the base station 10, and the network node 30 according to the embodiment of the present invention may transmit the calculated upper limit of the number of established connections to another wireless communication system. The upper limit of the number of established connections calculated by the wireless communication system may be received from another wireless communication system.

The above "predetermined type of communication bearer" may be "a communication bearer that supports voice and emergency calls". The above "communication bearer" may be replaced with "QoS flow".

It should be noted that the operations in the above-described embodiments may be performed by the network node 30, by the base station 10, by the terminal 20, or by the terminal 20, the base station 10, and the network. It may be implemented in a wireless communication system including node 30 . Also, the base station 10 and/or the terminal 20 may operate as the network node 30 in the operation of the above embodiments.

According to the above-described embodiments, the wireless communication system including the terminal 20, the base station 10 and the network node 30 preferentially grants connection requests for voice and emergency calls regardless of the number of communication bearers that have already established connections. be able to.

That is, in a wireless communication system, it is possible to avoid connection refusal for a connection request for a specific service.

(Device configuration)
Next, functional configuration examples of the base station 10 and the terminal 20 that execute the processes and operations described above will be described. The base stations 10 and terminals 20 contain the functionality to implement the embodiments described above. However, each of the base station 10 and terminal 20 may have only part of the functions in the embodiment.

<Base station 10>
FIG. 4 is a diagram showing an example of the functional configuration of base station 10 according to the embodiment of the present invention. As shown in FIG. 4 , the base station 10 has a transmitter 110 , a receiver 120 , a setter 130 and a controller 140 . The functional configuration shown in FIG. 4 is merely an example. As long as the operation according to the embodiment of the present invention can be executed, the functional division and the names of the functional units may be arbitrary. The network node 30 may have functional configurations similar to those of the base station 10 .

The transmission unit 110 includes a function of generating a signal to be transmitted to the terminal 20 side and wirelessly transmitting the signal. The transmitter 110 also transmits inter-node messages to other network nodes 30 . The receiving unit 120 includes a function of receiving various signals transmitted from the terminal 20 and acquiring, for example, higher layer information from the received signals. Also, the transmitting unit 110 has a function of transmitting NR-PSS, NR-SSS, NR-PBCH, DL/UL control signals, etc. to the terminal 20 . The receiving unit 120 also receives inter-node messages from other network nodes 30 .

The setting unit 130 stores preset setting information and various setting information to be transmitted to the terminal 20 . The content of the setting information is, for example, information related to communication in a specific service.

The control unit 140 controls communication in a specific service, as described in the embodiment. Also, the control unit 140 controls communication with the terminal 20 based on the UE capability report regarding radio parameters received from the terminal 20 . A functional unit related to signal transmission in control unit 140 may be included in transmitting unit 110 , and a functional unit related to signal reception in control unit 140 may be included in receiving unit 120 .

<Terminal 20>
FIG. 5 is a diagram showing an example of the functional configuration of terminal 20 according to the embodiment of the present invention. As shown in FIG. 5, the terminal 20 has a transmitting section 210, a receiving section 220, a setting section 230, and a control section 240. The functional configuration shown in FIG. 5 is merely an example. As long as the operation according to the embodiment of the present invention can be executed, the functional division and the names of the functional units may be arbitrary.

The transmission unit 210 creates a transmission signal from the transmission data and wirelessly transmits the transmission signal. The receiving unit 220 wirelessly receives various signals and acquires a higher layer signal from the received physical layer signal. Also, the receiving unit 220 has a function of receiving NR-PSS, NR-SSS, NR-PBCH, DL/UL/SL control signals and the like transmitted from the base station 10 . Further, for example, the transmission unit 210, as D2D communication, to the other terminal 20, PSCCH (Physical Sidelink Control Channel), PSSCH (Physical Sidelink Shared Channel), PSDCH (Physical Sidelink Discovery Channel), PSBCH (Physical Sidelink Broadcast Channel) etc., and the receiving unit 120 receives PSCCH, PSSCH, PSDCH, PSBCH, or the like from other terminals 20 .

The setting unit 230 stores various setting information received from the base station 10 by the receiving unit 220 . The setting unit 230 also stores preset setting information. The content of the setting information is, for example, information related to communication in a specific service.

The control unit 240 controls communication in a specific service, as described in the embodiment. A functional unit related to signal transmission in control unit 240 may be included in transmitting unit 210 , and a functional unit related to signal reception in control unit 240 may be included in receiving unit 220 .

(Hardware configuration)
The block diagrams (FIGS. 4 and 5) used to describe the above embodiments show blocks in functional units. These functional blocks (components) are implemented by any combination of at least one of hardware and software. Also, the method of realizing each functional block is not particularly limited. That is, each functional block may be realized using one device physically or logically coupled, or directly or indirectly using two or more physically or logically separated devices (e.g. , wired, wireless, etc.) and may be implemented using these multiple devices. A functional block may be implemented by combining software in the one device or the plurality of devices.

Functions include judging, determining, determining, calculating, calculating, processing, deriving, investigating, searching, checking, receiving, transmitting, outputting, accessing, resolving, selecting, choosing, establishing, comparing, assuming, expecting, assuming, Broadcasting, notifying, communicating, forwarding, configuring, reconfiguring, allocating, mapping, assigning, etc. can't For example, a functional block (component) that performs transmission is called a transmitting unit or transmitter. In either case, as described above, the implementation method is not particularly limited.

For example, the base station 10, the terminal 20, etc. according to the embodiment of the present disclosure may function as a computer that performs processing of the wireless communication method of the present disclosure. FIG. 6 is a diagram illustrating an example of hardware configurations of the base station 10 and the terminal 20 according to an embodiment of the present disclosure. The base station 10 and terminal 20 described above are physically configured as a computer device including a processor 1001, a storage device 1002, an auxiliary storage device 1003, a communication device 1004, an input device 1005, an output device 1006, a bus 1007, and the like. good too. The network node 30 may have the same hardware configuration as the base station 10 or the terminal 20.

In the following explanation, the term "apparatus" can be read as a circuit, device, unit, or the like. The hardware configuration of the base station 10 and terminal 20 may be configured to include one or more of each device shown in the figure, or may be configured without some devices.

Each function of the base station 10 and the terminal 20 is performed by the processor 1001 performing calculations and controlling communication by the communication device 1004 by loading predetermined software (programs) onto hardware such as the processor 1001 and the storage device 1002. or by controlling at least one of data reading and writing in the storage device 1002 and the auxiliary storage device 1003 .

The processor 1001, for example, operates an operating system and controls the entire computer. The processor 1001 may be configured with a central processing unit (CPU) including an interface with peripheral devices, a control device, an arithmetic device, registers, and the like. For example, the control unit 140 , the control unit 240 and the like described above may be implemented by the processor 1001 .

In addition, the processor 1001 reads programs (program codes), software modules, data, etc. from at least one of the auxiliary storage device 1003 and the communication device 1004 to the storage device 1002, and executes various processes according to them. As the program, a program that causes a computer to execute at least part of the operations described in the above embodiments is used. For example, control unit 140 of base station 10 shown in FIG. 4 may be implemented by a control program stored in storage device 1002 and operated by processor 1001 . Also, for example, the control unit 240 of the terminal 20 shown in FIG. Although it has been explained that the above-described various processes are executed by one processor 1001, they may be executed simultaneously or sequentially by two or more processors 1001. FIG. Processor 1001 may be implemented by one or more chips. Note that the program may be transmitted from a network via an electric communication line.

The storage device 1002 is a computer-readable recording medium, for example, ROM (Read Only Memory), EPROM (Erasable Programmable ROM), EEPROM (Electrically Erasable Programmable ROM), RAM (Random Access Memory), etc. may be configured. The storage device 1002 may also be called a register, cache, main memory (main storage device), or the like. The storage device 1002 can store executable programs (program code), software modules, etc. for implementing a communication method according to an embodiment of the present disclosure.

The auxiliary storage device 1003 is a computer-readable recording medium, for example, an optical disk such as a CD-ROM (Compact Disc ROM), a hard disk drive, a flexible disk, a magneto-optical disk (for example, a compact disk, a digital versatile disk, a Blu -ray disk), smart card, flash memory (eg, card, stick, key drive), floppy disk, magnetic strip, and/or the like. The storage medium described above may be, for example, a database, server, or other suitable medium including at least one of storage device 1002 and secondary storage device 1003 .

The communication device 1004 is hardware (transmitting/receiving device) for communicating between computers via at least one of a wired network and a wireless network, and is also called a network device, a network controller, a network card, a communication module, or the like. The communication device 1004 includes a high-frequency switch, a duplexer, a filter, a frequency synthesizer, etc., in order to realize at least one of, for example, frequency division duplex (FDD) and time division duplex (TDD). may consist of For example, a transmitting/receiving antenna, an amplifier section, a transmitting/receiving section, a transmission line interface, etc. may be implemented by the communication device 1004 . The transceiver may be physically or logically separate implementations for the transmitter and receiver.

The input device 1005 is an input device (for example, keyboard, mouse, microphone, switch, button, sensor, etc.) that receives input from the outside. The output device 1006 is an output device (for example, display, speaker, LED lamp, etc.) that outputs to the outside. Note that the input device 1005 and the output device 1006 may be integrated (for example, a touch panel).

Each device such as the processor 1001 and the storage device 1002 is connected by a bus 1007 for communicating information. The bus 1007 may be configured using a single bus, or may be configured using different buses between devices.

In addition, the base station 10 and the terminal 20 include hardware such as a microprocessor, a digital signal processor (DSP), an ASIC (Application Specific Integrated Circuit), a PLD (Programmable Logic Device), and an FPGA (Field Programmable Gate Array). and part or all of each functional block may be implemented by the hardware. For example, processor 1001 may be implemented using at least one of these pieces of hardware.

(Summary of embodiment)
As described above, according to the embodiment of the present invention, a receiving unit that receives a communication bearer connection request and whether or not to permit the connection request based on the upper limit of the number of connection establishments of the communication bearer. wherein the control unit reduces in advance the number of connection establishments required for a specific type of communication bearer from the upper limit of the number of connection establishments.

With the above configuration, the wireless communication system including the terminal 20, the base station 10, and the network node 30 preferentially grants connection requests for voice and emergency calls regardless of the number of communication bearers that have already established connections. can be done. That is, in a wireless communication system, it is possible to avoid connection refusal for a connection request for a specific service.

The control unit may not permit a connection request for a communication bearer that does not correspond to the specific type of communication bearer in a state where the number of communication bearer connection establishments has not reached the upper limit of the connection establishment count. With this configuration, the wireless communication system including the terminal 20, the base station 10, and the network node 30 can preferentially grant connection requests for voice and emergency calls, regardless of the number of communication bearers that have already established connections. can.

It may further include a transmission unit that transmits information indicating the connectable number of communication bearers of a type other than the specific type of communication bearer to the base station or the terminal. With this configuration, the wireless communication system including the terminal 20, the base station 10, and the network node 30 can process connection requests according to the number of communication bearers for which connections have already been established.

The apparatus may further include a transmitting unit that responds, in response to a connection request for a communication bearer of a type other than the specific type of communication bearer, with information indicating failure due to securing resources for setting the specific type of communication bearer. good. With this configuration, the wireless communication system including the terminal 20, the base station 10 and the network node 30 can notify the reason why the connection establishment has failed.

When the control unit receives a connection request for the communication bearer of the specific type when the number of connection establishments of communication bearers has reached the upper limit of the number of connection establishments, after releasing the already established communication bearers, A connection request for the communication bearer of the specific type may be permitted. With this configuration, the wireless communication system including the terminal 20, the base station 10, and the network node 30 can preferentially grant connection requests for voice and emergency calls, regardless of the number of communication bearers that have already established connections. can.

Further, according to an embodiment of the present invention, a wireless communication system including a terminal, a base station, and a network node includes a transmitting unit that transmits a communication bearer connection request and a receiving unit that receives the communication bearer connection request. and a control unit that determines whether or not to permit the connection request based on the upper limit of the number of connection establishments of communication bearers, wherein the control unit determines the number of connection establishments required for a specific type of communication bearer. , a wireless communication system is provided in which the upper limit of the number of connection establishments is reduced in advance.

Further, according to an embodiment of the present invention, a wireless communication system including a terminal, a base station, and a network node includes a transmitting unit that transmits a communication bearer connection request and a receiving unit that receives the communication bearer connection request. and a control unit that determines whether or not to permit the connection request based on the upper limit of the number of connection establishments of the communication bearer, wherein the control unit determines the number of connection establishments required for a specific type of communication bearer. Based on this, a wireless communication system is provided that calculates the upper limit of the number of connection establishments.

The transmission unit may transmit the calculated upper limit of the number of established connections to another wireless communication system. With this configuration, the wireless communication system including the terminal 20, the base station 10, and the network node 30 notifies the other wireless communication system of the upper limit of the number of connection establishments of the communication bearers, so that the other wireless communication system can perform the wireless communication. The number of connection establishments of communication bearers in the system can be controlled by referring to the upper limit of the number of connection establishments of communication bearers.

Further, according to the embodiment of the present invention, a receiving procedure for receiving a communication bearer connection request and a control procedure for determining whether or not to permit the connection request based on the upper limit of the number of connection establishments of the communication bearer. and a procedure for subtracting in advance the number of connections to be established required for a specific type of communication bearer from the upper limit of the number of connections to be established.

(Supplement to the embodiment)
Although the embodiments of the present invention have been described above, the disclosed invention is not limited to such embodiments, and those skilled in the art can understand various modifications, modifications, alternatives, replacements, and the like. be. Although specific numerical examples have been used to facilitate understanding of the invention, these numerical values are merely examples and any appropriate values may be used unless otherwise specified. The division of items in the above description is not essential to the present invention, and the items described in two or more items may be used in combination as necessary, and the items described in one item may be combined with another item. may apply (unless inconsistent) to the matters set forth in Boundaries of functional or processing units in functional block diagrams do not necessarily correspond to boundaries of physical components. The operations of a plurality of functional units may be physically performed by one component, or the operations of one functional unit may be physically performed by a plurality of components. As for the processing procedures described in the embodiments, the processing order may be changed as long as there is no contradiction. Although the network node 30 and the terminal 20 have been described using functional block diagrams for convenience of process description, such devices may be implemented in hardware, software, or a combination thereof. The software operated by the processor of the network node 30 according to the embodiment of the invention and the software operated by the processor of the terminal 20 according to the embodiment of the invention are respectively stored in random access memory (RAM), flash memory, read-only memory. (ROM), EPROM, EEPROM, register, hard disk (HDD), removable disk, CD-ROM, database, server, or any other appropriate storage medium.

Also, notification of information is not limited to the aspects/embodiments described in the present disclosure, and may be performed using other methods. For example, notification of information includes physical layer signaling (e.g., DCI (Downlink Control Information), UCI (Uplink Control Information)), higher layer signaling (e.g., RRC (Radio Resource Control) signaling, MAC (Medium Access Control) signaling, It may be implemented by broadcast information (MIB (Master Information Block), SIB (System Information Block)), other signals, or a combination thereof.In addition, RRC signaling may also be called an RRC message, for example, RRC It may be a connection setup (RRC Connection Setup) message, an RRC connection reconfiguration message, or the like.

Each aspect/embodiment described in the present disclosure includes LTE (Long Term Evolution), LTE-A (LTE-Advanced), SUPER 3G, IMT-Advanced, 4G (4th generation mobile communication system), 5G (5th generation mobile communication system) system), FRA (Future Radio Access), NR (new Radio), W-CDMA (registered trademark), GSM (registered trademark), CDMA2000, UMB (Ultra Mobile Broadband), IEEE 802.11 (Wi-Fi (registered trademark) )), IEEE 802.16 (WiMAX (registered trademark)), IEEE 802.20, UWB (Ultra-WideBand), Bluetooth (registered trademark), and other suitable systems and extended It may be applied to at least one of the next generation systems. Also, a plurality of systems may be applied in combination (for example, a combination of at least one of LTE and LTE-A and 5G, etc.).

The order of the processing procedures, sequences, flowcharts, etc. of each aspect/embodiment described in this specification may be changed as long as there is no contradiction. For example, the methods described in this disclosure present elements of the various steps using a sample order and are not limited to the specific order presented.

A specific operation performed by the network node 30 in this specification may be performed by its upper node in some cases. In a network of one or more network nodes, including network node 30, various operations performed for communication with terminal 20 may be network node 30 and other network nodes other than network node 30 ( (eg, but not limited to MME or S-GW). Although the above example illustrates the case where there is one network node other than the network node 30, the other network node may be a combination of a plurality of other network nodes (for example, MME and S-GW). .

Information, signals, etc. described in the present disclosure may be output from a higher layer (or a lower layer) to a lower layer (or a higher layer). It may be input and output via multiple network nodes.

Input/output information may be stored in a specific location (for example, memory) or managed using a management table. Input/output information and the like can be overwritten, updated, or appended. The output information and the like may be deleted. The entered information and the like may be transmitted to another device.

The determination in the present disclosure may be performed by a value represented by 1 bit (0 or 1), may be performed by a boolean value (Boolean: true or false), or may be performed by comparing numerical values (e.g. , comparison with a predetermined value).

Software, whether referred to as software, firmware, middleware, microcode, hardware description language or otherwise, includes instructions, instruction sets, code, code segments, program code, programs, subprograms, and software modules. , applications, software applications, software packages, routines, subroutines, objects, executables, threads of execution, procedures, functions, and the like.

In addition, software, instructions, information, etc. may be transmitted and received via a transmission medium. For example, the software uses at least one of wired technology (coaxial cable, fiber optic cable, twisted pair, digital subscriber line (DSL), etc.) and wireless technology (infrared, microwave, etc.) to website, Wired and/or wireless technologies are included within the definition of transmission medium when sent from a server or other remote source.

The information, signals, etc. described in this disclosure may be represented using any of a variety of different technologies. For example, data, instructions, commands, information, signals, bits, symbols, chips, etc. that may be referred to throughout the above description may refer to voltages, currents, electromagnetic waves, magnetic fields or magnetic particles, light fields or photons, or any of these. may be represented by a combination of

The terms explained in this disclosure and terms necessary for understanding this disclosure may be replaced with terms having the same or similar meanings. For example, the channel and/or symbols may be signaling. A signal may also be a message. A component carrier (CC) may also be called a carrier frequency, a cell, a frequency carrier, or the like.

The terms "system" and "network" used in this disclosure are used interchangeably.

In addition, the information, parameters, etc. described in the present disclosure may be expressed using absolute values, may be expressed using relative values from a predetermined value, or may be expressed using other corresponding information. may be represented. For example, radio resources may be indexed.

The names used for the parameters described above are not restrictive names in any respect. Further, the formulas, etc., using these parameters may differ from those expressly disclosed in this disclosure. Since the various channels (e.g., PUCCH, PDCCH, etc.) and information elements can be identified by any suitable name, the various names assigned to these various channels and information elements are in no way restrictive names. is not.

In the present disclosure, "base station (BS)", "radio base station", "base station device", "fixed station", "NodeB", "eNodeB (eNB)", "gNodeB (gNB)", "access point", "transmission point", "reception point", "transmission/reception point", "cell", "sector", Terms such as "cell group," "carrier," and "component carrier" may be used interchangeably. A base station may also be referred to by terms such as macrocell, small cell, femtocell, picocell, and the like.

A base station can accommodate one or more (eg, three) cells. When a base station accommodates multiple cells, the overall coverage area of the base station can be partitioned into multiple smaller areas, each smaller area being associated with a base station subsystem (e.g., an indoor small base station (RRH: The term "cell" or "sector" refers to part or all of the coverage area of at least one of the base stations and base station subsystems serving communication services in this coverage. point to

In the present disclosure, terms such as "Mobile Station (MS)", "user terminal", "User Equipment (UE)", "terminal", etc. may be used interchangeably. .

A mobile station is defined by those skilled in the art as a subscriber station, mobile unit, subscriber unit, wireless unit, remote unit, mobile device, wireless device, wireless communication device, remote device, mobile subscriber station, access terminal, mobile terminal, wireless It may also be called a terminal, remote terminal, handset, user agent, mobile client, client, or some other suitable term.

At least one of the base station and mobile station may be called a transmitting device, a receiving device, a communication device, or the like. At least one of the base station and the mobile station may be a device mounted on a mobile object, the mobile object itself, or the like. The mobile object may be a vehicle (e.g., car, airplane, etc.), an unmanned mobile object (e.g., drone, self-driving car, etc.), or a robot (manned or unmanned ). Note that at least one of the base station and the mobile station includes devices that do not necessarily move during communication operations. For example, at least one of the base station and the mobile station may be an IoT (Internet of Things) device such as a sensor.

Also, the base station in the present disclosure may be read as a user terminal. For example, communication between a base station and a user terminal is replaced with communication between a plurality of terminals 20 (for example, D2D (Device-to-Device), V2X (Vehicle-to-Everything), etc.) Regarding the configuration, each aspect/embodiment of the present disclosure may be applied. In this case, the terminal 20 may have the functions of the network node 30 described above. Also, words such as "up" and "down" may be replaced with words corresponding to inter-terminal communication (for example, "side"). For example, uplink channels, downlink channels, etc. may be read as side channels.

Similarly, user terminals in the present disclosure may be read as base stations. In this case, the base station may have the functions that the above-described user terminal has.

The terms "determining" and "determining" used in this disclosure may encompass a wide variety of actions. "Judgement" and "determination" are, for example, judging, calculating, computing, processing, deriving, investigating, looking up, searching, inquiring (eg, lookup in a table, database, or other data structure), ascertaining as "judged" or "determined", and the like. Also, "judgment" and "determination" are used for receiving (e.g., receiving information), transmitting (e.g., transmitting information), input, output, access (accessing) (for example, accessing data in memory) may include deeming that a "judgment" or "decision" has been made. In addition, "judgment" and "decision" are considered to be "judgment" and "decision" by resolving, selecting, choosing, establishing, comparing, etc. can contain. In other words, "judgment" and "decision" may include considering that some action is "judgment" and "decision". Also, "judgment (decision)" may be read as "assuming", "expecting", "considering", or the like.

The terms "connected", "coupled", or any variation thereof, mean any direct or indirect connection or coupling between two or more elements, It can include the presence of one or more intermediate elements between two elements being "connected" or "coupled." Couplings or connections between elements may be physical, logical, or a combination thereof. For example, "connection" may be read as "access". As used in this disclosure, two elements are in the radio frequency domain using at least one of one or more wires, cables and printed electrical connections, and as some non-limiting and non-exhaustive examples. , electromagnetic energy having wavelengths in the microwave and optical (both visible and invisible) regions, and the like.

The reference signal can also be abbreviated as RS (Reference Signal), and may also be called Pilot depending on the applicable standard.

The term "based on" as used in this disclosure does not mean "based only on" unless otherwise specified. In other words, the phrase "based on" means both "based only on" and "based at least on."

Any reference to elements using the "first," "second," etc. designations used in this disclosure does not generally limit the quantity or order of those elements. These designations may be used in this disclosure as a convenient method of distinguishing between two or more elements. Thus, reference to a first and second element does not imply that only two elements can be employed or that the first element must precede the second element in any way.

"Means" in the configuration of each device described above may be replaced with "unit", "circuit", "device", or the like.

Where "include," "including," and variations thereof are used in this disclosure, these terms are inclusive, as is the term "comprising." is intended. Furthermore, the term "or" as used in this disclosure is not intended to be an exclusive OR.

In this disclosure, if articles are added by translation, such as a, an, and the in English, the disclosure may include that the nouns following these articles are plural.

In the present disclosure, the term "A and B are different" may mean "A and B are different from each other." The term may also mean that "A and B are different from C". Terms such as "separate," "coupled," etc. may also be interpreted in the same manner as "different."

Each aspect/embodiment described in the present disclosure may be used alone, may be used in combination, or may be used by switching along with execution. In addition, the notification of predetermined information (for example, notification of “being X”) is not limited to being performed explicitly, but may be performed implicitly (for example, not notifying the predetermined information). good too.

It should be noted that, in the present disclosure, communication bearers for voice and emergency calls are examples of specific types of communication bearers.

Although the present disclosure has been described in detail above, it is clear to those skilled in the art that the present disclosure is not limited to the embodiments described in the present disclosure. The present disclosure can be practiced with modifications and variations without departing from the spirit and scope of the present disclosure as defined by the claims. Accordingly, the description of the present disclosure is for illustrative purposes and is not meant to be limiting in any way.

10 base station 110 transmitting unit 120 receiving unit 130 setting unit 140 control unit 20 terminal 210 transmitting unit 220 receiving unit 230 setting unit 240 control unit 30 network node 1001 processor 1002 storage device 1003 auxiliary storage device 1004 communication device 1005 input device 1006 output device

Claims

a receiving unit that receives a communication bearer connection request;
a control unit that determines whether to permit the connection request based on the upper limit of the number of communication bearer connection establishments;
The control unit is a network node that subtracts in advance the number of connections to be established required for a specific type of communication bearer from the upper limit of the number of connections to be established.
2. The network node according to claim 1, wherein the control unit does not permit a connection request for a communication bearer that does not correspond to the specific type of communication bearer in a state where the number of communication bearer connection establishments has not reached the upper limit of the number of connection establishments. .
The network node according to claim 1, further comprising a transmitting unit that transmits information indicating the connectable number of communication bearers of a type other than the specific type of communication bearer to the base station or the terminal.
2. The apparatus further comprising a transmitting unit that responds with information indicating failure due to securing resources for setting the communication bearer of the specific type in response to a connection request for a communication bearer of a type other than the communication bearer of the specific type. Network node as described.
When the control unit receives a connection request for the communication bearer of the specific type when the number of connection establishments of communication bearers has reached the upper limit of the number of connection establishments, after releasing the already established communication bearers, 2. The network node according to claim 1, which permits a connection request for said specific type of communication bearer.
A wireless communication system comprising terminals, base stations and network nodes,
a transmitter for transmitting a communication bearer connection request;
a receiving unit that receives a communication bearer connection request;
a control unit that determines whether to permit the connection request based on the upper limit of the number of communication bearer connection establishments;
The control unit is a wireless communication system in which the number of connections to be established required for a specific type of communication bearer is subtracted in advance from the upper limit of the number of connections to be established.
A wireless communication system comprising terminals, base stations and network nodes,
a transmitter for transmitting a communication bearer connection request;
a receiving unit that receives a communication bearer connection request;
a control unit that determines whether to permit the connection request based on the upper limit of the number of communication bearer connection establishments;
The control unit is a wireless communication system configured to calculate the upper limit of the number of established connections based on the number of established connections required for a specific type of communication bearer.
The wireless communication system according to claim 7, wherein the transmitting unit transmits the calculated upper limit of the number of established connections to another wireless communication system.
a receiving procedure for receiving a communication bearer connection request;
a control procedure for determining whether or not to permit the connection request based on the upper limit of the number of communication bearer connection establishments;
A communication method in which a network node executes a procedure of subtracting in advance the number of connection establishments required for a specific type of communication bearer from the upper limit of the number of connection establishments.