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WO2019035287A1 - Procédé de commande de communication et système de communication - Google Patents

Procédé de commande de communication et système de communication Download PDF

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Publication number
WO2019035287A1
WO2019035287A1 PCT/JP2018/025728 JP2018025728W WO2019035287A1 WO 2019035287 A1 WO2019035287 A1 WO 2019035287A1 JP 2018025728 W JP2018025728 W JP 2018025728W WO 2019035287 A1 WO2019035287 A1 WO 2019035287A1
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WO
WIPO (PCT)
Prior art keywords
access
communication control
access type
amf
network
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/JP2018/025728
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English (en)
Japanese (ja)
Inventor
拓也 下城
スリサクル タコルスリ
マラ レディ サマ
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
NTT Docomo Inc
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NTT Docomo Inc
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by NTT Docomo Inc filed Critical NTT Docomo Inc
Publication of WO2019035287A1 publication Critical patent/WO2019035287A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W16/00—Network planning, e.g. coverage or traffic planning tools; Network deployment, e.g. resource partitioning or cells structures
    • H04W16/02—Resource partitioning among network components, e.g. reuse partitioning
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W8/00—Network data management
    • H04W8/22—Processing or transfer of terminal data, e.g. status or physical capabilities
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W88/00—Devices specially adapted for wireless communication networks, e.g. terminals, base stations or access point devices
    • H04W88/14—Backbone network devices

Definitions

  • the present invention relates to a communication control method and a communication system, and more particularly, to a communication control node in a communication system in which a network slice (hereinafter abbreviated as "slice") which is a virtual network is logically generated on a network infrastructure.
  • the present invention relates to a communication control method implemented by the present invention and the communication system.
  • a network system using a conventional virtualization technology virtually separates hardware resources using the virtualization technology disclosed in Non-Patent Document 1, and is a virtual network logically generated on a network infrastructure. Generate a slice. Then, by assigning a service to the slice, it is possible to provide a service using a network of independent slices. As a result, when a slice is allocated to each of the services having various requirements, it becomes easy to satisfy the requirements of each service, and it is possible to reduce the signaling processing and the like.
  • a slice selection device NSSF Network Slice Selection Function
  • AMF Access and Mobility Management Function
  • SMF Session Management Function
  • the present invention aims to determine appropriate access processing based on the access type.
  • a communication control method is a communication control method executed by a communication control node that performs communication control in a communication system in which a slice that is a virtual network is logically generated on a network infrastructure. And acquiring an access type indicating an access method to a network by a terminal, and determining an access process to slice components constituting the slice based on the acquired access type.
  • the communication control node acquires an access type indicating an access method to the network by the terminal, and determines access processing to the slice component based on the acquired access type. This allows the appropriate access processing to be determined based on the actual access type in situations where different access types may be used.
  • the above-mentioned "communication control node” includes, for example, AMF (Access and Mobility Management Function), SMF (Session Management Function), NRF (Network Repository Function) which is a dedicated node for determining access processing, and the like.
  • the “slice component” includes, for example, AMF, SMF, UPF (User Plane Function), AUSF (Authentication Server Function), PCF (Policy Control Function) and the like.
  • the “access processing” to be determined includes, for example, selection of slice components according to the access type, and also includes inquiring of the access type to the terminal when there is no slice component according to the access type .
  • the "access type” is information indicating which access method the terminal has accessed.
  • appropriate access processing can be determined based on the access type.
  • the first embodiment is an example in which the present invention is applied to a network registration process by a terminal (User Equipment, hereinafter referred to as “UE”)
  • the second embodiment is a PDU (Protocol Data Unit) based on a request from the UE. It is an example which applied the present invention to session establishment processing.
  • UE User Equipment
  • PDU Protocol Data Unit
  • the communication system 1a includes a terminal (UE) 10, a plurality of radio access networks (hereinafter referred to as "RAN") 20, an initial AMF 30A, and a target.
  • a plurality of RANs 20 are wireless networks based on various communication methods such as mobile communication networks according to 3GPP standards including eNodeBs corresponding to base stations, wireless networks not conforming to 3GPP standards (for example, Wi-Fi etc.) Is included.
  • 3GPP standards including eNodeBs corresponding to base stations, wireless networks not conforming to 3GPP standards (for example, Wi-Fi etc.) Is included.
  • the initial AMF 30A and the target AMF 30B are nodes provided with functions (AMF functions) for performing access management, mobility management, etc. of the UE 10 located in the network, and among the above, the initial AMF 30A is the default AMF for the UE 10,
  • the target AMF 30B is an AMF selected as an AMF to be accessed by the process according to the present invention described later.
  • the NRF 40 is a dedicated node having a function of determining access processing according to the present invention in the communication system 1 a
  • the UDM 50 is a node having a function of managing user (subscriber) information of the UE 10.
  • the NSSF 60 is a node having a function of selecting a slice
  • the AUSF 70 is a node having a function of executing an authentication process.
  • the SMF 80 is a node having a function of managing a U-Plane session
  • the UPF 90 is a node having a function of processing U-Plane traffic.
  • a slice which is a virtual network logically generated on the network infrastructure, is configured to include the target AMF 30B, SMF 80 and UPF 90, and a set of nodes and circuits that constitute the slice is called NSI (Network Slice Instance). .
  • NSI Network Slice Instance
  • FIG. 2 shows the message transmission from UE to the message transmission to UE.
  • the process of FIG. 2 does not include the process by the SMF 80 and the UPF 90 because it is a process before the slice is created.
  • an Initial UE message is transmitted from the UE to the initial AMF via the RAN (step 1 in FIG. 2), and then predetermined option processing is performed (step 2). Then, the initial AMF requests subscriber information related to the user (subscriber) of the UE from the UDM (step 3), and receives a response from the UDM (step 4). The initial AMF also sends a slice selection request to the NSSF (step 5) and receives its response from the NSSF (step 6).
  • the initial AMF transmits, to the NRF, an Nnrf_NF Discovery Request including an access type indicating an access method from the UE in order to query the NRF for a target AMF to be accessed by the UE. 7).
  • the initial AMF recognizes the access type from the UE in the above step 1 depending on which access method RAN the UE has accessed from. By automatically recognizing the access type in this way, it becomes unnecessary to send an explicit notification (notification on the access type) from the UE.
  • the initial AMF may recognize the access type by an explicit notification from the UE (notification regarding the access type).
  • the NRF determines an appropriate target AMF according to the access type included in the Nnrf_NF Discovery Request, and responds the determined target AMF to the initial AMF by the Nnrf_NF Discovery Response (step 8).
  • the NRF may request the initial AMF to query the UE for another access type in the absence of an appropriate target AMF according to the access type.
  • the NRF may not only determine the target AMF to access, but also may request the UE to query another access type in the absence of an appropriate target AMF.
  • the initial AMF performs the following redirect processing to change the destination of the message from the UE to the target AMF.
  • a first method of directly transmitting Reroute message from the initial AMF to the target AMF shown in (A) of FIG. 2 and a second method of redirecting to the target AMF via the RAN shown in (B) of FIG. The method is illustrated.
  • the initial AMF directly transmits the Reroute message to the target AMF (step 9A), and then transmits and receives an N2 message between the target AMF and the RAN (steps 10A and 11A), and the UE Redirect the message destination from to the target AMF.
  • the target AMF recognizes the access type from the UE depending on which access method RAN has sent the N2 message in step 11A. By thus automatically recognizing the access type, it becomes unnecessary to send an explicit notification on the access type from, for example, the initial AMF.
  • the target AMF may recognize the access type by explicit notification of the access type included in the N2 message.
  • the initial AMF transmits the Reroute NAS message including the information of the target AMF to the RAN (step 9B), and transmits the Initial UE message from the UE again from the RAN to the target AMF.
  • Step 10B redirect the destination of the message from the UE to the target AMF.
  • the target AMF recognizes the access type from the UE depending on which access method RAN has transmitted the Initial UE message in step 10B. Also, the target AMF may recognize the access type by explicit notification of the access type included in the Initial UE message.
  • the target AMF then selects the appropriate AUSF based on the recognized access type (step 12). Thereafter, predetermined authentication processing is performed among the selected AUSF, UE and UDM (step 13).
  • Step 14 Registration Accept is sent from the initial AMF to the UE via RAN (Step 15), and Registration Complete responds to the initial AMF via the RAN from RAN Step 16).
  • Step 15 Registration Accept is sent from the initial AMF to the UE via RAN (Step 15)
  • Registration Complete responds to the initial AMF via the RAN from RAN Step 16).
  • the initial AMF selects an appropriate target AMF (target AMF to be accessed by the UE) according to the access type. it can. That is, appropriate access processing can be determined. Similarly, the target AMF can select the appropriate AUSF based on the recognized access type.
  • a disadvantage considered when selecting an access destination node based on the service requirements that is, a node unsuitable for the access type (for example, a node with a capacity excess) is selected Can be prevented.
  • the present invention is applied to PDU session establishment processing based on a request from a UE.
  • the PDU session establishment process is performed in the communication system 1b according to the second embodiment shown in FIG. The components associated with are shown.
  • the communication system 1 b includes the UE 10, the plurality of RANs 20, the AMF 30, the NRF 40, the UDM 50, the plurality of SMFs 80, the plurality of UPFs 90, and the plurality of PCFs (Policy Control Function) 100. It comprises.
  • the AMF 30 here corresponds to the target AMF 30B in the first embodiment, and the details thereof will be described later.
  • the AMF 30 selects an appropriate SMF 80 according to the access type from a plurality of SMFs 80.
  • the selected SMF 80 selects an appropriate UPF 90 according to the access type from the plurality of UPFs 90, and selects an appropriate PCF 100 according to the access type from the plurality of PCFs 100.
  • FIGS. 4 to 6 An example in which the present invention is applied to PDU session establishment processing based on a request from a UE will be described below using FIGS. 4 to 6.
  • a PDU Session Establishment Request is transmitted from the UE to the AMF via the RAN (step 1 in FIG. 4).
  • the AMF recognizes the access type from the UE depending on which access method RAN has transmitted a PDU Session Establishment Request. By thus automatically recognizing the access type, it becomes unnecessary to send an explicit notification on the access type from the UE. Note that the AMF may recognize the access type by explicit notification of the access type included in the PDU Session Establishment Request.
  • the AMF selects an appropriate SMF related to the PDU Session as follows (step 2). For example, as shown in FIG. 5, the AMF selects an appropriate SMF by querying the NRF. That is, when the AMF transmits an Nnrf_NF Discovery_request including the access type (indicated as “Access Network Type” in FIG. 5) recognized as described above to the NRF (Step 1 in FIG. 5), the NRF receives the received Nnrf_NF. As a process responding to Discovery_request, an appropriate SMF according to the access type is selected (Step 2 in FIG. 5), and Nnrf_NF Discovery_response including the selected SMF information is returned to the AMF (Step 3 in FIG. 5). This allows the AMF to select an appropriate SMF according to the access type. In addition, in step 2 of FIG. 4, the AMF may select an SMF corresponding to an access type by the AMF itself, in addition to inquiring to the NRF.
  • Nnrf_NF Discovery_request
  • the AMF requests the PDU session establishment by sending Namf_PDUSession_CreateSMContext to the selected SMF (step 3), and the SMF obtains subscriber information by sending Nudm_SubscriberData_Get to the UDM (step 4), and A predetermined user authentication process (PDU Session authentication / authorization) prior to the establishment of a PDU session is executed (step 5).
  • the SMF recognizes the access type, for example, from the access type information included in the message received in step 3 or from the access type information included in a message (not shown) from an AMF or the like. Then, the SMF selects an appropriate PCF according to the access type (step 6a). In the process of step 6a, as in step 2 described above, the PCF may be selected by inquiring to the NRF, or the PCF may be selected by the SMF itself. Thereafter, predetermined processing related to policy control is performed between the SMF and the selected PCF (steps 6 b and 6 c).
  • the SMF selects an appropriate UPF according to the access type (step 7). For example, as shown in FIG. 6, the SMF selects an appropriate UPF by querying the NRF. That is, when the SMF transmits Nnrf_NF Discovery_request including the previously recognized access type (denoted as “Access Network Type” in FIG. 6) to the NRF (Step 1 in FIG. 6), the NRF responds to the received Nnrf_NF Discovery_request. Then, an appropriate UPF according to the access type is selected (step 2 in FIG. 6), and an Nnrf_NF Discovery_response including the selected UPF information is returned to the SMF (step 3 in FIG. 6). This allows the SMF to select an appropriate UPF according to the access type. In addition, in step 7 of FIG. 4, the SMF may select the UPF according to the access type by the SMF itself other than inquiring to the NRF.
  • predetermined processing related to policy control is performed between the SMF and the PCF (steps 8a and 8b), and the SMF transmits an N4 Session Establishment / Modification Request to the selected UPF (step 9a), A response (N4 Session Establishment / Modification Response) is received from the UPF (step 9b).
  • the SMF transmits an Nsmf_PDUSession_CreateSMContext Response to the AMF as a response to the PDU Session establishment request in the step 3 (step 10).
  • the AMF makes a session establishment request by transmitting an N2 PDU Session Request to the RAN (step 11), and accordingly, a PDU session is established between the RAN and the UE (step 12), and further, from the RAN
  • the process according to the session establishment request is completed by responding N2 PDU Session Request Ack to AMF (step 13). Thereafter, predetermined processing including the first uplink data transmission from the UE is performed (step 14).
  • the AMF can select an appropriate SMF according to the access type, and the SMF accesses Appropriate UPF and PCF can be selected according to the type. In this way, appropriate access processing can be determined.
  • a disadvantage considered when selecting an access destination node based on the service requirements that is, a node unsuitable for the access type (for example, a node with a capacity excess) is selected Can be prevented.
  • each functional block may be realized by one physically and / or logically coupled device, or directly and / or indirectly two or more physically and / or logically separated devices. It may be connected by (for example, wired and / or wireless) and realized by the plurality of devices.
  • the communication control nodes nodes such as the NRF 40, the AMF 30, and the SMF 80
  • the terminal (UE) 10 may function as a computer that performs the above-described processing.
  • the UE 10 may be physically configured as a computer device including a processor 1001, a memory 1002, a storage 1003, a communication device 1004, an input device 1005, an output device 1006, a bus 1007 and the like.
  • the term “device” can be read as a circuit, a device, a unit, or the like.
  • the hardware configuration of the terminal 10 may be configured to include one or more of the devices illustrated in the drawing, or may be configured without including some devices.
  • Each function in the terminal 10 performs a calculation by causing the processor 1001 to read predetermined software (program) on hardware such as the processor 1001 and the memory 1002, and performs communication by the communication device 1004, data in the memory 1002 and the storage 1003. This is realized by controlling the reading and / or writing of
  • the processor 1001 operates, for example, an operating system to control the entire computer.
  • the processor 1001 may be configured by a central processing unit (CPU: Central Processing Unit) including an interface with a peripheral device, a control device, an arithmetic device, a register, and the like.
  • CPU Central Processing Unit
  • each functional unit of the terminal 10 may be realized including the processor 1001.
  • the processor 1001 reads a program (program code), a software module and data from the storage 1003 and / or the communication device 1004 to the memory 1002, and executes various processing according to these.
  • a program a program that causes a computer to execute at least a part of the operations described in the above embodiments is used.
  • each functional unit of the terminal 10 may be realized by a control program stored in the memory 1002 and operated by the processor 1001, or may be realized similarly for other functional blocks.
  • the various processes described above have been described to be executed by one processor 1001, but may be executed simultaneously or sequentially by two or more processors 1001.
  • the processor 1001 may be implemented by one or more chips.
  • the program may be transmitted from the network via a telecommunication line.
  • the memory 1002 is a computer readable recording medium, and includes, for example, at least one of a ROM (Read Only Memory), an EPROM (Erasable Programmable ROM), an EEPROM (Electrically Erasable Programmable ROM), and a RAM (Random Access Memory). It may be done.
  • the memory 1002 may be called a register, a cache, a main memory (main storage device) or the like.
  • the memory 1002 may store a program (program code), a software module, etc. that can be executed to implement the method according to an embodiment of the present invention.
  • the storage 1003 is a computer readable recording medium, and for example, an optical disc such as a CD-ROM (Compact Disc ROM), a hard disc drive, a flexible disc, a magneto-optical disc (eg, a compact disc, a digital versatile disc, a Blu-ray A (registered trademark) disk, a smart card, a flash memory (for example, a card, a stick, a key drive), a floppy (registered trademark) disk, a magnetic strip, and the like may be used.
  • the storage 1003 may be called an auxiliary storage device.
  • the above-mentioned storage medium may be, for example, a database including the memory 1002 and / or the storage 1003, a server or any other suitable medium.
  • the communication device 1004 is hardware (transmission / reception device) for performing communication between computers via a wired and / or wireless network, and is also called, for example, a network device, a network controller, a network card, a communication module, or the like.
  • a network device for example, a network controller, a network card, a communication module, or the like.
  • each functional unit of the above-described terminal 10 may be realized including the communication device 1004.
  • the input device 1005 is an input device (for example, a keyboard, a mouse, a microphone, a switch, a button, a sensor, and the like) that receives an input from the outside.
  • the output device 1006 is an output device (for example, a display, a speaker, an LED lamp, etc.) that performs output to the outside.
  • 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 memory 1002 is connected by a bus 1007 for communicating information.
  • the bus 1007 may be configured by a single bus or may be configured by different buses among the devices.
  • the terminal 10 includes hardware such as a microprocessor, a digital signal processor (DSP), an application specific integrated circuit (ASIC), a programmable logic device (PLD), and a field programmable gate array (FPGA). Some or all of the functional blocks may be realized by the hardware. For example, processor 1001 may be implemented in at least one of these hardware.
  • DSP digital signal processor
  • ASIC application specific integrated circuit
  • PLD programmable logic device
  • FPGA field programmable gate array
  • the input / output information may be stored in a specific place (for example, a memory), or may be managed by a management table. Information to be input or output may be overwritten, updated or added. The output information may be deleted. The input information or the like may be transmitted to another device.
  • the determination may be performed by a value (0 or 1) represented by one bit, may be performed by a boolean value (Boolean: true or false), or may be compared with a numerical value (for example, a predetermined value). Comparison with the value).
  • notification of predetermined information is not limited to what is explicitly performed, but is performed by implicit (for example, not notifying of the predetermined information) It is also good.
  • Software may be called software, firmware, middleware, microcode, hardware description language, or any other name, and may be instructions, instruction sets, codes, code segments, program codes, programs, subprograms, software modules. Should be interpreted broadly to mean applications, software applications, software packages, routines, subroutines, objects, executables, threads of execution, procedures, functions, etc.
  • software, instructions, etc. may be sent and received via a transmission medium.
  • software may use a wireline technology such as coaxial cable, fiber optic cable, twisted pair and digital subscriber line (DSL) and / or a website, server or other using wireless technology such as infrared, radio and microwave When transmitted from a remote source, these wired and / or wireless technologies are included within the definition of transmission medium.
  • wireline technology such as coaxial cable, fiber optic cable, twisted pair and digital subscriber line (DSL) and / or a website, server or other using wireless technology such as infrared, radio and microwave
  • data, instructions, commands, information, signals, bits, symbols, chips etc may be voltage, current, electromagnetic waves, magnetic fields or particles, optical fields or photons, or any of these May be represented by a combination of
  • information, parameters, and the like described in the present specification may be represented by absolute values, may be represented by relative values from predetermined values, or may be represented by corresponding other information. .
  • Mobile communication terminals may be subscriber stations, mobile units, subscriber units, wireless units, remote units, mobile devices, wireless devices, wireless communication devices, remote devices, mobile subscriber stations, access terminals, mobile terminals, by those skilled in the art. It may also be called a wireless terminal, a remote terminal, a handset, a user agent, a mobile client, a client, or some other suitable term.
  • determining may encompass a wide variety of operations.
  • “Judgment”, “decision” are, for example, judging, calculating, calculating, processing, processing, deriving, investigating, looking up (for example, a table) (Searching in a database or another data structure), ascertaining may be regarded as “decision”, “decision”, etc.
  • “determination” and “determination” are receiving (e.g. receiving information), transmitting (e.g. transmitting information), input (input), output (output), access (accessing) (for example, accessing data in a memory) may be regarded as “judged” or “decided”.
  • the phrase “based on” does not mean “based only on,” unless expressly stated otherwise. In other words, the phrase “based on” means both “based only on” and “based at least on.”
  • any reference to that element does not generally limit the quantity or order of those elements. These designations may be used herein as a convenient way of distinguishing between two or more elements. Thus, reference to the first and second elements does not mean that only two elements can be taken there, or that in any way the first element must precede the second element.
  • 1a, 1b ... communication system 10 ... terminal (UE), 20 ... RAN, 30 ... AMF, 30A ... initial AMF, 30B ... target AMF, 40 ... NRF, 50 ... UDM, 60 ... NSSF, 70 ... AUSF, 80 ... SMF, 90: UPF, 100: PCF, 1001: processor, 1002: memory, 1003: storage, 1004: communication device, 1005: input device, 1006: output device, 1007: bus.

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Databases & Information Systems (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

L'invention concerne un procédé de commande de communication qui est exécuté par un nœud de commande de communication (par exemple, NRF (fonction de référentiel de réseau)) qui effectue une commande de communication dans un système de communication dans lequel une tranche, qui est un réseau virtuel, est générée logiquement sur une infrastructure de réseau. Le procédé de commande de communication comprend : une étape (1) pour acquérir un type d'accès indiquant un système pour accéder à un réseau par un terminal ; et une étape (2) pour déterminer, sur la base du type d'accès acquis, un processus pour accéder à un élément constitutif de tranche qui constitue la tranche.
PCT/JP2018/025728 2017-08-14 2018-07-06 Procédé de commande de communication et système de communication Ceased WO2019035287A1 (fr)

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JP2017156567A JP2020194988A (ja) 2017-08-14 2017-08-14 通信制御方法および通信システム
JP2017-156567 2017-08-14

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WO2019035287A1 true WO2019035287A1 (fr) 2019-02-21

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2021093160A1 (fr) * 2020-01-15 2021-05-20 Zte Corporation Traitement sécurisé d'enregistrement de communications sans fil
EP4192064A4 (fr) * 2020-07-31 2024-01-17 Vivo Mobile Communication Co., Ltd. Procédé et appareil de commande d'accès, et dispositif de communication

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
CATT: "TS 23.501: access technology being used by UE being one of slice selection parameters", 3GPP SA WG2 MEETING #122 S 2-175046, 30 June 2017 (2017-06-30), XP051310060 *
NTT DOCOMO: "TS 23. 502: Clarification of NSSAI stored in the UE", 3GPP DRAFT; S2-174653-TS23502_SUBSCRIBEDNSSAI,, 30 June 2017 (2017-06-30), pages 1 - 10, XP051303496 *

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2021093160A1 (fr) * 2020-01-15 2021-05-20 Zte Corporation Traitement sécurisé d'enregistrement de communications sans fil
EP4192064A4 (fr) * 2020-07-31 2024-01-17 Vivo Mobile Communication Co., Ltd. Procédé et appareil de commande d'accès, et dispositif de communication
US12457211B2 (en) 2020-07-31 2025-10-28 Vivo Mobile Communication Co., Ltd. Access control method, access control apparatus, and communications device

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