NZ740067B2 - TERMINAL DEVICE, DEVICE PROVIDED WITH ProSe FUNCTION, COMMUNICATION METHOD FOR TERMINAL DEVICE, AND COMMUNICATION METHOD FOR DEVICE PROVIDED WITH ProSe FUNCTION - Google Patents

Abstract

The invention provides molecules, e.g., antibodies or antibody fragments, that specifically bind thymic stromal lymphopoietin (TSLP), compositions comprising these molecules, and methods of using and producing these molecules.

Description

TERMINAL DEVICE, DEVICE PROVIDED WITH PROSE FUNCTION, COMMUNICATION METHOD FOR AL DEVICE, AND COMMUNICATION METHOD FOR DEVICE PROVIDED WITH PROSE FUNCTION Technical Field The present invention relates to a terminal device and the like.

Background Art The 3rd tion Partnership Project , which undertakes activities for standardizing recent mobile ication systems, is in the which process of creating specifications for the Evolved Packet System (EPS), realizes an all-IP architecture. In 3GPP, an access system connected to EPS is under study while taking into consideration not only a case of LTE but also a case of wireless LAN.

Furthermore, in 3GPP, a Proximity based Service (ProSe), as described in NFL 1, has been studied in the process of creating the specifications for EPS.

ProSe is aimed at providing a service in which a function for User Equipment (UE) as a communication terminal to detect another proximity communication terminal (discovery), a function to establish direct communication between pieces of UE without passing through a core network, a base station or the like (direct communication), and the like are given.

In ProSe, since direct communication can be made between terminals without passing h a base station, a core network to which an access network is connected, or the like, tration on the access k, the core network, or the like can be prevented (congestion prevention) so that an offloading effect can be expected.

Furthermore, in ProSe, in order for a terminal outside a ication in which a range ofa base n to access the network, a UE—to-NW Relay terminal inside the communication range becomes a relay terminal for the terminal outside the communication range is also under study now.

WO 02843 A1 To be specific, the UE-to-NW Relay is a service achieved by the terminal inside the communication range and the terminal outside the communication range ofthe base station establishing a direct communication path.

Note that, a terminal device having a function of ting to the network by a PDN tion, even from the outside of the communication range, is referred to as Remote UE, and a terminal device configured to provide the PDN connection to the Remote UE by a relay is referred to as Relay UE.

To ish a direct communication path n proximity terminal devices, ProSe needs a service in which a terminal device seeks and detects a terminal device as a communication target in the direct communication. To se, a function for a terminal device to detect a proximity terminal device (discovery) is needed. In ProSe, as an example of this type of detection method, a detection method in which Relay UE transmits an announcing signal to Remote UE to notify the Remote UE that the Relay UE has a Relay function while the Remote UE monitors the announcing signal has been d. This type of detection method is defined as a "Model A".

Further in ProSe, as an example ofa ion method, a detection method in which the Remote UE transmits a Solicitation signal to the Relay UE and the Relay UE having received the Solicitation message from the Remote UE replies a Response whereby the Remote UE detects the Relay UE has been studied. This type of detection method is defined as a "Model B". Note that the Solicitation signal may be an announcing signal and the Relay UE may receive the announcing signal from the Remote UE by monitoring.

Moreover, as a direct communication path between pieces of UE, usage of two schemes are being considered in ProSe. The first one is a method using an LTE access technique. The second one is a method using a Wireless LAN (WLAN) access technique.

Furthermore, non-Public Safety and Public Safety are defined in ProSe.

The non-Public Safety assumes a commercial service by a mobile k operator, and is available only in a case of UE being positioned within a communication range of an LTE base station. On the other hand, the Public Safety assumes usage by a disaster prevention radio system, and is available not only in a case of UE being positioned within a communication range of the LTE base station but also a case of UE not positioned within the communication range ofthe LTE base n (eNB).

Citation List Non Patent ture NFL 1: 3GPP TR 23.303 Technical Specification Group Services and System Aspects, Proximity-based Services (ProSe), Stage 2 (Release 12) Summary of Invention Technical Problem In ProSe, such a method is under study that provides a function to detect proximity UE (discovery), a function to establish direct communication between pieces of UE without g through a core network, a base station or the like (direct communication), and the like.

In addition, to provide a function for Remote UE to detect Relay UE in its ity, the following functions are under study: an announcing function for the Relay UE to notify ity UE ofthe on ofthe Relay UE itself; a monitoring function for the Remote UE to detect the Relay UE by receiving the notification based on the announcing function; a function for the Remote UE to transmit a tation message to the Relay UE and receive a Response message; a function for the Relay UE to receive the Solicitation message from the Remote UE and transmit the Response message to the Remote UE; and the like.

Pieces of UE (the Relay UE and the Remote UE) perform a Model A discovery procedure by the announcing and ring, and a Model B discovery procedure by the Solicitation and the Response while using a Relay Service Code, which is a code indicating a connection service ing a relay of the network.

The Relay Service Code may correspond to a connection service to PDN provided by the Relay UE, and needs to be regularly or irregularly updated from a security standpoint.

As such, UE needs to assume that a server device notifies UE of multiple Relay Service Codes corresponding to the same service.

Accordingly, in a case where UE obtains different multiple Relay Service Codes for the same service and/or sets different multiple Relay Service Codes for the same service, UE needs to determine a timing at which the use of an old Relay Service Code is d and a timing at which the use of a new Relay Service Code is d.

Unfortunately, any specific method for determining these timing has not been disclosed yet.

In consideration of the above circumstances, an object of the present ion is to provide a preferable method for controlling a stop timing, a start timing, and the like of a relay tion service by Relay UE, Remote UE, and the like based on ProSe in order to achieve a function in which UE present outside coverage of a base station detects UE inside another coverage being positioned in proximity (discovery).

Solution to Problem To achieve the above object, in a first aspect, the present invention es a User Equipment (UE) comprising: a transmission and/or reception unit configured to: transmit, to a device equipped with a ProSe function, a request message for a first service authorization, to request authorization for the UE to be ly detected as a relay User Equipment (UE) by a proximity User Equipment (UE) oned in proximity to the UE, or to request authorization for the UE to perform direct communication with the proximity UE; receive, from the device equipped with the ProSe function, an authorization e for the t message; and receive a Relay Service Code from the device equipped with the ProSe function, n the Relay Service Code is a code indicating a connectivity service ed by the UE, and a control unit configured to start counting a timer, in a case of receiving a timer value included in the authorization message and indicating a period of time during which the first service authorization for the connectivity service is valid.

In r aspect, the present invention es a communication control method performed by a User Equipment (UE), the communication control method comprising: transmitting, to a device equipped with a ProSe function, a request message for a first service authorization, to request authorization for the UE to be directly detected as a relay User Equipment (UE) by a proximity User Equipment (UE) positioned in proximity to the UE, or to request authorization for the UE to perform direct ication with the proximity UE; receiving, from the device equipped with the ProSe function, an authorization message for the request message; receiving a Relay Service Code from the device equipped with the ProSe function, wherein the Relay Service Code is a code indicating a connectivity service provided by the UE, and starting counting a timer, in a case of receiving a timer value included in the authorization message and indicating a period of time during which the first service ization for the connectivity e is valid.

Paragraphs [0023] and [0024] have now been deleted. ageous Effects of Invention According to the t invention, a valid time during which a relay connection service based on ProSe can be performed can be managed under the control of a network or.

Brief Description of Drawings is a diagram illustrating an overview of a mobile communication system.

FIGS. 2A and 2B are diagrams illustrating a ration of an IP mobile communication network, and the like. is a diagram illustrating a device configuration of Relay UE.

FIGS. 4A to 4C are ms illustrating an example of each data structure stored in a storage unit. is a diagram rating a device configuration of Remote UE.

FIGS. 6A to 6C are diagrams illustrating an example of each data structure stored in a storage unit. is a diagram illustrating a device configuration ofa ProSe function unit.

FIGS. 8A and 8B are diagrams illustrating an example of each data structure stored in a storage unit. is a diagram illustrating a device configuration of HSS.

FIGS. 10A and 10B are diagrams illustrating an example of each data structure stored in a storage unit. is a diagram illustrating a device configuration of an application FIGS. 12A and 12B are diagrams illustrating an example of each data structure stored in a storage unit. is a diagram illustrating a service authentication procedure. is a diagram rating an cing request procedure. is a diagram illustrating a monitoring request procedure. is a diagram illustrating a Relay Service Code update procedure. is a diagram illustrating a discovery request procedure of Relay UE. is a diagram illustrating a discovery request procedure of Remote Description of ments id="p-27" id="p-27" id="p-27" id="p-27" id="p-27"

[0027] Hereinafter, a preferred embodiment for performing the present invention will be bed with reference to the drawings. Note that as an example, the present embodiment bes an embodiment of a mobile communication system to which the present invention is applied. id="p-28" id="p-28" id="p-28" id="p-28" id="p-28"

[0028] 1. First Embodiment Hereinafter, a radio communication technology according to an embodiment of the present invention will be described in detail with reference to the drawings. 1.1 Overview of Communication System is a function block diagram rating an example of a schematic configuration ofa communication system 1 according to the embodiment ofthe present invention.

The communication system 1 rated in is configured of UE_A 8 as a terminal device having a function related to ProSe (ProSe d UE), a Packet Data Network (PDN)_A 5, an Internet Protocol (IP) mobile ication network_A 3, a ProSe function unit_A 7, and a ProSe application server_A 2. id="p-31" id="p-31" id="p-31" id="p-31" id="p-31"

[0031] Furthermore, the communication system 1 may be configured including a terminal , like UE_B 9, having functions related to multiple ProSes.

The PDNWA 5 and a terminal device, such as the UE_A 8 or UE_B 9, having a function related to ProSe are connected through the IP mobile communication network_A 3. Further, the UE_A 8 and the UE‘B 9 are ed with a service based on ProSe.

The ProSe function unit_A 7 is a server device configured to manage communication using the ProSe function ofthe UE_A 8 and/or the UE_B 9, and performs tication ofthe terminal device when a ProSe service or the like is provided. Note that the ProSe function unit_A 7 may be included in the PDN_A 5 or may be separated from the PDN_A 5. Alternatively, the ProSe function unit_A 7 may be included in the IP mobile communication network_A 3.

The UE_A 8 and the UE_B 9 may be ted to the same mobile operator network, connected to different mobile operator ks, or connected to a broadband network operated by a fixed network operator. id="p-35" id="p-35" id="p-35" id="p-35" id="p-35"

[0035] For example, the UE_A 8 may be connected to an IP mobile communication network operated and managed by a first network operator (Mobile Operator), while the UE_B 9 may be connected to an IP mobile communication network that is operated and d by a second network operator and is different from the IP mobile communication k operated and managed by the first network operator. In this case, the IP mobile communication network by the second network operator may be connected to the PDN_A 5. Since the internal configuration of the stated network may be the same as that of the IP mobile communication network_A 3, the ed description thereof will be omitted.

These IP mobile communication networks may be configured oftwo IP mobile communication networks under a roaming ct with each other, or configured oftwo IP mobile communication networks provided in the same country.

The ProSe function unit_A 7 configured to manage communications of the UE_A 8 and the UE_B 9 may be a ProSe on unit managed by a network operator with which the UE_A 8 and the UE_B 9 have a contract, may be a ProSe function unit managed by a network operator having a relationship of contract with a network vendor to be under contract, or may be a ProSe function unit managed by network ors in the same country. id="p-38" id="p-38" id="p-38" id="p-38" id="p-38"

[0038] Here, the broadband network refers to an IP communication network that is operated by a network operator and that provides high-speed communication using a digital line such as optical fiber over Asymmetric Digital Subscriber Line (ADSL) or the like. Alternatively, the broadband network may be, without being limited to such a network, a network for radio access using Worldwide Interoperability for Microwave Access (WiMAX) or the like.

Each of pieces of UE such as the UE_A 8 and the UE_B 9 is a communication terminal capable of establishing a connection using an access system, such as LTE or WLAN. UE es a 3GPP LTE communication ace, a WLAN communication interface, or the like and is capable of establishing a connection to the IP mobile communication network_A 3. atively, each of pieces of UE such as the UE_A 8 and the UE_B 9 radio may establish, without being limited o, a tion using another system such as Worldwide Interoperability for Microwave Access (WiMAX).

Note that, in the example of the schematic configuration illustrated in the UE_A 8 is in a state of being disposed inside a communication range where the UE_A 8 can be connected to the IP mobile communication network_A 3, while the UE_B 9 is in a state of being temporarily disposed outside the communication range where the UE_B 9 cannot be connected to the IP mobile communication network_A 3. To rephrase, the UE_A 8 is present within coverage of the access network, while the UE_B 9 is present outside the coverage of the access network.

The UE_A 8 provides a network tion service to the UE_B 9 using a relay. Such tion service is referred to as a "UE-to-NW Relay service" in the present specification.

The PDN_A 5 refers to a network that provides network es for transmitting and receiving data in the form of packet. For example, the PDN_A is a k that provides a specific communication service such as the Internet and IMS. Note that the PDN_A 5 may be a Packet Data Network (PDN).

The PDNWA 5 is connected to the IP mobile communication network_A 3 with a wired line or the like. Connectivity between the PDN_A 5 and the IP mobile communication network_A 3 is secured by ADSL, optical fiber, or the like, for example.

FIGS. 2A and 2B are diagrams rating an e of a detailed configuration of the communication system 1 illustrated in A configuration example illustrated in is configured ofthe UE_A 8, the IP mobile communication network_A 3, and the PDN_A 5. Multiple pieces of UE, in addition to the UE_A 8, can be connected to the IP mobile communication network_A 3. Although an example ofthe UE_A 8 being ted is illustrated in , the UE_B 9 can also be configured in the same manner as the UE_A 8 in a case that the UE_B 9 is within the network coverage.

The IP mobile communication network 3 is configured ofa core k_A 90 and le radio access networks (an LTE AN_A 80, a WLAN ANb 75, a WLAN ANa 70, a UTRAN_A 20, and a GERAN_A 25).

The radio access network may be constituted of multiple different access networks, or may be constituted of either one ofthe access networks. Moreover, the UE_A 8 can wirelessly connect to the radio access network.

Moreover, the WLAN access network b (WLAN ANb 75) that connects to the core network_A 90 via an ePDG_A 65 and the WLAN access network a (WLAN ANa 75) that connects to a PGW_A 30, a PCRF_A 60, and an AAA_A 55 can be configured as access networks table in a WLAN access system.

Note that each device has a similar configuration to those of the devices of the related art in a mobile communication system using EPS, and thus detailed descriptions thereof will be omitted. Each device will be described briefly hereinafter.

The PGW_A 30 is connected to the PDN_A 5, an SGW_A 35, the ePDGgA 65, the WLAN ANa 70, the PCRF_A 60, and the AAA_A 55 and is a relay device configured to transfer user data by functioning as a gateway device between the PDN_A 5 and the core network_A 90. The PGW_A 30 may be a Packet Data Network Gateway (PGW) further ing a PGW function of the related art.

The SGW_A 35 is connected to the PGW_A 30, an MME_A 40, the LTE AN_A 80, an SGSN_A 45, and a UTRAN_A 20 and is a relay device configured to transfer user data by functioning as a gateway device between the core networkHA 90 and the 3GPP access network (the A 20, the GERAN_A , and the LTE AN_A 80). The SGW_A 35 may be a Serving Gateway (SGW) r including a SGW function ofthe related art.

The MME_A 40 is connected to the SGW_A 35, the LTE AN_A 80, and a Home Subscriber Server (HSS)_A 50 and is an access control device that performs location information management and access l for the UE_A 8 Via the LTE AN_A 80. rmore, the core k_A 90 may e multiple location management devices. For example, a on management device different from the MME_A 40 may be constituted. The MME_A 40 may be a Mobility Management Entity (MME) further including a MME function of the related art. As with the MME_A 40, the location management device different from the MME_A 40 may be connected to the SGW_A 35, the LTE AN_A 80, and the HSS_A 50.

Furthermore, in a case that multiple MMEs are included in the core network_A 90, the MMEs may be connected to each other. With this configuration, the context of the UE_A 8 may be transmitted/received among the MMEs.

The HSS_«A 50 is connected to the MME_A 40 and the AAA_A 55 and is a managing node configured to manage subscriber information. The subscriber information ofthe HSS_A 50 is referred to during MME_A 40 access control, for example. Moreover, the HSS_A 50 may be connected to the location ment device different from the MME_A 40. The HSS_A 50 may be a Home Subscriber Server (HSS) r including a HSS function of the related art.

The AAA_A 55 is connected to the PGW_A 30, the HSS_A 50, the PCRF_A 60, and the WLAN ANa 70 and is configured to perform access control for UE ted via the WLAN ANa 70. The AAA_A 55 may be an Authentication, Authorization and Accounting (AAA) further including an AAA function ofthe related art. id="p-56" id="p-56" id="p-56" id="p-56" id="p-56"

[0056] The PCRF_A 60 is ted to the PGW_A 30, the WLAN ANa 75, the AAA_A 55, and the PDN_A 5 and is configured to perform QoS management on data ry. For example, the PCRF_A 60 manages QoS of a communication path between the UE_A 8 and the PDN_A 5. id="p-57" id="p-57" id="p-57" id="p-57" id="p-57"

[0057] The ePDG_A 65 is connected to the PGW_A 30 and the WLAN ANb 75 and is configured to deliver user data by functioning as a gateway device between the core network_A 90 and the WLAN ANb 75. The PCRF_A 60 may be a Policy and Changing Rule Function (PCRF) further ing a PCRF function ofthe related art. [005 8] The SGSN_A 45 is connected to the UTRAN_A 20, the GERAN_A 25, and the SGW_A 35 and is a control device for location management between a 3G/2G access network (UTRAN/GERAN) and an LTE access network (E—UTRAN). In addition, the SGSN_A 45 has functions of: selecting PGW and SGW; managing a time zone of UE; and ing MME at the time of handover to N. The SGSN_A 45 may be 3 Serving GPRS Support Node (SGSN) further including a SGSN function of the related art.

A1 PCT/JP20 1 6/069245 Meanwhile, as illustrated in , each radio access network includes devices to which the UE_A 8 is actually connected (such as a base station device and an access point device), and the like. The devices used in these connections can be thought of as devices adapted to the radio access networks.

In the t embodiment, the LTE AN_A 80 may be E—URAN including an eNB_A 45. The eNB_A 45 is a radio base station to which the UE_A 8 connects in the LTE access system, and the LTE AN_A 80 may be configured to include one or multiple radio base stations.

The WLAN ANa 70 is configured to include a WLAN APa 72 and a TWAGMA 74. The WLAN APa 72 is a radio base station to which the UE_A 8 connects in a WLAN access system trusted by the operator running the core network_A 90, and the WLAN ANa 70 may be configured to include one or multiple radio base stations. The GW 74 is a gateway device n the core network_A 90 and the WLAN ANa 70. Furthermore, the WLAN APa 72 and the GW 74 may be constituted as a single device.

Even in a case where the operator g the core network_A 90 and the operator running the WLAN ANa 70 are different, such a tution can be implemented through contracts and agreements between the operators.

Furthermore, the WLAN ANb 75 is configured to include a WLAN APb 76. The WLAN APb 76 is a radio base n to which the UE_A 8 connects in the WLAN access system in a case where no trust relationship is established with the operator running the core network_A 90, and the WLAN ANb 75 may be configured to include one or le radio base stations.

In this manner, the WLAN ANb 75 is ted to the core networkMA 90 via the ePDG_A 65, which is a device ed in the core network_A 90, serving as a gateway. The ePDG_A 65 has a ty function for ensuring the security of communication.

The UTRAN_A 20 is configured to include a Radio Network Controller A 24 and an eNB (UTRAN)_A 22. The eNB (UTRAN)_A 22 is a radio base station to which the UE_A 8 connects through a UMTS Terrestrial Radio Access (UTRA), and the UTRAN_A 20 may be configured to include one or multiple radio base stations. rmore, the RNC_A 24 is a control unit configured to connect the core network_A 90 and the eNB (UTRAN)_A 22, and the UTRAN_A 20 may e one or le RNCs. Moreover, the RNC_A 24 may be connected to one or multiple eNBs (UTRANs). In addition, the RNC_A 24 may be connected to a radio base station, that is, a Base Station Subsystem (BSS)_A 26 included in the GERAN_A 25.

The GERAN_A 25 is configured to include a BSS_A 26. The BSS_A 26 is a radio base station to which the UE__A 8 connects through GSM/EDGE Radio Access (GERA), and the GERAN_A 25 may be constituted of one or multiple radio base stations BSSs. Furthermore, the multiple BSSs may be connected to each other. Moreover, the BSS_A 26 may be connected to the RNC_A 24.

Note that, , a terminal device being connected to each of the radio access networks refers to a terminal device being connected to a base station device, an access point, or the like included in each ofthe radio access networks, and data, signals, and the like being transmitted/received by the al device also pass through those base station devices, access points, or the like. id="p-68" id="p-68" id="p-68" id="p-68" id="p-68"

[0068] 1.2 Device Configuration Device configurations of the UE_A 8 as Relay UE, the UE_B 9 as Remote UE, the ProSe function unit_A 7, the HSS_A, and the ProSe ation _A, illustrated in will be briefly described with reference to the drawings. 1.2.1 Configuration of Relay UE The device configuration of the UE_A 8 as Relay UE is described below.

It is sufficient that the UE_A 8 is a radio communication terminal including the ProSe function; the UE_A 8 may be a mobile phone al configured to transmit/receive data by radio communication using an LTE access scheme, or may be a communication terminal configured to perform information exchange among the devices in a mode so called machine—to-machine (M2M). In addition, the UE_A 8 may be a relay terminal device having a Relay function. id="p-70" id="p-70" id="p-70" id="p-70" id="p-70"

[0070] illustrates a device ration ofthe UE_A 8 in the present ment. The UE_A 8 is constituted of a transmission/reception antenna_A 300, a switch_A 304, a direct transmission/reception unit_A 308, a A1 2016/069245 transmission/reception unit_A 306, a l unit_A 302, and a storage unit_A 340. In the UE__A 8, the direct ission/reception unit_A 308, the transmission/reception unit_A 306, the switch_A 304, and the storage unit_A 340 are connected to the control unit_A 302 via a bus.

The control unit_A 302 is a function unit to control the UEHA 8. The control unit_A 302 is a function unit configured to read out and e various kinds of programs stored in the storage unit_A 340.

The switcth 304 is a function unit configured to, under the control of the control unit_A 302, connect the transmission/reception unit‘A 306 and the direct transmission/reception unit_A 308 to the transmission/reception antenna___A 300.

The transmission/reception unit_A 306 is a function unit configured to transmit/receive radio ication data through the LTE access scheme. The ission/reception unit_A 306 is configured of a transmitter and a receiver; the itter can transmit control information through an LTE base station, and the er can transmit data or control information through the LTE base station.

The direct transmission/reception unit_A 308 is a function unit capable of directly communicating with another UE Without passing through an LTE base n regarding data or control information. The direct ission/reception unit_A 308 is configured of a direct transmitter and a direct receiver. The direct transmitter can transmit data or control information without passing through an LTE base station, and the direct receiver can receive data or control information without passing through an LTE base station. The transmission/reception unit_A 306 and the direct transmission/reception unit_A 308 may be configured as a single transmission/reception unit.

Note that antennas may be provided to each ofthe transmission/reception unit_A 306 and the direct transmission/reception unit_A 308, and data may be transmitted/received under the control of the control unit_A 302. id="p-76" id="p-76" id="p-76" id="p-76" id="p-76"

[0076] The storage unit_A 340 is a function unit configured to store programs, data, and the like necessary for each operation of the UE_A 8. The storage unit 313 is constituted of, for example, a semiconductor memory, a Hard Disk Drive (HDD), or the like. rmore, a UE context_A 342 and a Remote UE context_A 344 are stored in the storage unit_A 340. The Remote UE context_A 344 may be part of the UE context_A 342.

The UE context_A 342 may be context information associated with a terminal device and context information which a terminal device of the related art stores. The UE t_A 342 at least includes a UE context for each UE. illustrates the UE context for each UE. As illustrated in , the UE context for each UE is at least configured to e IMSI, an EMM State, GUTI, an ME Identity, and a ProSe ability. id="p-80" id="p-80" id="p-80" id="p-80" id="p-80"

[0080] IMSI is identification information to be ed to a user (subscriber) using the UE_A 8. IMSI may be identification information indicating a line contract, and may be stored in a SIM card.

The EMM State indicates a ty management state of the UE_A 8.

For example, the EMM State may be EMM-REGISTERED in which the UE_A 8 is registered with the network (registered state) or EMM -DEREGISTERD in which the UE_A 8 is not registered with the network (deregistered state).

GUTI is an abbreviation of "Globally Unique Temporary Identity," and is temporary fication information on the UE_A 8. GUTI is constituted ofthe identification information (Globally Unique MME Identifier (GUMMEI)) on MME (e.g. the MME_A 40) and the identification information (M-TMSI) on the UE_A 8 in a specific MME (e.g. the MME_A 40). id="p-83" id="p-83" id="p-83" id="p-83" id="p-83"

[0083] The ME identity is an ID of ME, and may be IMEI/IMISV, for example.

Here, ME may be UE.

The ProSe ability is identification information ting the inclusion of a communication function using ProSe. rmore, the ProSe ability may be identification information indicating the inclusion of a function to transmit an announcing signal toward proximity UE, or identification ation indicating a function capable of becoming a relay terminal between a proximity terminal and the network. Furthermore, there may be different pieces of fication information for each ofthese capabilities, and the ProSe ability of fication may be identification information in which the above pieces information are combined.

Furthermore, a UE context that is managed for each PDN connection, or a UE context that is managed for each bearer may be stored in the UE context_A 342.

The Remote UE context_A 344 will be bed next. The Remote UE context__A 344 is a t to manage the connection between Remote UE and the network in order for the UE_A 8 to become Relay UE.

The Remote UE context__A 344 is configured to include a Remote UE context for each PDN connection and a Remote UE context for each bearer. illustrates the Remote UE context for each PDN connection. In the Remote UE context for each PDN connection, there are stored a PDN connection ID, a PDN connection type, an Application ID, a ProSe Application User ID, APN, an IP address, an IP address for remote UE, a Default bearer, a Group ID, a ProSe Relay UE ID, a Relay Service Code, and a Timer.

The PDN connection ID is identification information for identifying a PDN connection. For example, in a case that the UE_A 8 establishes a PDN connection with the PDN_A 5 for Remote UE, the same PDN connection ID as that ofthe PDN_A 5 may be stored.

The PDN connection type may be information to indicate whether the PDN connection identified by the PDN tion ID is a PDN connection for the terminal itself ofthe d art or a PDN connection for the Remote UE. To be specific, "Normal" in the case ofa PDN connection for the terminal , "for Remote UE" in the case of a PDN connection for the Remote UE, or the like may be indicated. rmore, the information on the PDN connection type may be included in the PDN connection ID. In such case, the type of PDN connection may be identified based on the PDN connection ID.

The Application ID is ation identifying an application that the PDN connection can use. The storage unit may store multiple Application IDs.

Furthermore, in the case where Remote UE of a proximity terminal connects to this PDN connection, the storage unit may store the Application ID to identify the application that the proximity terminal uses. To rephrase, the Application ID for identifying the application by which the UE_A 8 establishes a direct ication path with the proximity terminal may be stored in the storage unit.

The ProSe Application User ID is identification information to identify a user that has been assigned from a ProSe application server to perform a Relay function using ProSe ofthe UE_A 8. The ProSe Application User ID is information that is stored in the ProSe application server while being related to user information in the application layer.

APN indicates a connection destination of the UE_A 8. This APN may be constituted of identification information on the network and identification information on a default operator.

The IP Address is an IP address ed to the UE_A 8 for the PDN connection, and may be an IPv4 address or an IPv6 prefix. id="p-95" id="p-95" id="p-95" id="p-95" id="p-95"

[0095] The IP address for remote UE is an IP address ed to a proximity terminal used for establishing a direct communication path of ProSe between the proximity al and the UE_A 8. Note that the IP s assigned to the ity al may be an address assigned from the IPv6 prefix which is reported to the UE_A 8 from the network, or may be reported from the network.

The Default Bearer is EPS bearer identification information for fying a default bearer in this PDN tion.

The Group ID is identification information of a group to which the UE_A 8 belongs. The Group ID may be identification information ofa group in which a ProSe function is available. The Group ID may be, when the UE_A 8 performs one-to-many communication, a transmission destination address in a layer 2 to which the UE_A 8 transmits. id="p-98" id="p-98" id="p-98" id="p-98" id="p-98"

[0098] The ProSe Relay UE ID is identification information identifying the UE_A 8. The ProSe Relay UE ID may be ation telling, to the ProSe function unit, that it is authorized to function as a relay terminal.

WO 02843 A1 The Relay Service Code is a code indicating a tion service in which the UE_A 8 provides a network relay with a proximity terminal device.

The ProSe Relay UE ID is not transmitted in direct communication for detecting a proximity terminal, but is used to obtain the Relay Service Code which is used by the UE_B 9 to detect a proximity al.

In addition, the Relay Service Code is a code that is used when the UE_A 8 announces the inclusion of a relay function to a proximity terminal in a proximity terminal detection ure of the Model A. In other words, the UE_A 8 transmits an announcing signal including the Relay Service Code, whereby the UE_A 8 is detected by a proximity terminal which s to be connected to the network using a rely function of ProSe. The Relay Service Code may be a code ed from the ProSe function unit.

Alternatively, the Relay Service Code is a code that is used when Remote UE announces the inclusion of a relay function to a proximity terminal in a proximity terminal detection procedure of the Model B. In other words, the UE_A 8 receives, from proximity Remote UE, an announcing signal including the Relay Service Code and transmits a Response to the Remote UE, whereby the UE_A 8 is ed by the proximity al. The Relay Service Code may be a code reported from the ProSe function unit.

Furthermore, the Relay Service Code may be a connection service of an application for disaster prevention ication c Safety), or may be ation in which different codes are related to respective applications so that the applications can be identified. The Timer is a timer related to the Relay Service Code and indicates a period oftime during which the Relay Service Code is valid. illustrates the Remote UE context for each bearer. In the Remote UE context for each bearer, at least transfer path identification information and a Transaction ID may be stored. id="p-105" id="p-105" id="p-105" id="p-105" id="p-105"

[0105] The transfer path identification information may be information for identifying a bearer. Specifically, the transfer path identification information may be a bearer ID, for example.

WO 02843 A1 2016/069245 The Transaction ID is information for identifying the communication using a bearer. 1.2.2 Configuration of Remote UE The device ration ofthe UE_B 9 as Remote UE is described below. It is sufficient that the UE_B 9 is a radio communication terminal including the ProSe function; the UE_B 9 may be a mobile phone terminal configured to transmit/receive data by radio communication using the LTE access scheme, or may be a communication terminal configured to perform information exchange among the devices in a mode so called machine-to-machine (M2M).

In addition, the UE_B 9 may be a remote terminal device e of connecting with a relay terminal device. illustrates the device configuration ofthe UE_B 9 in the present embodiment. The UE_B 9 is constituted of a ission/reception antenna_B 500, a switch_B 504, a direct transmission/reception unit_B 508, a ission/reception unit_B 508, a control unit_B 502, and a storage unit_B 540. In the UE_B 9, the direct transmission/reception unit_B 508, the transmission/reception unit_B 506, the swicth_B 504, and the storage unit_B 540 are connected to the control unit_B 502 via a bus.

The control unit_B 502 is a function unit to control the UE_‘A 8. The l unit_B 502 is a function unit configured to read out and execute various kinds of programs stored in the storage unit_B 540.

The switch_B 504 is a function unit configured to, under the control of the control unit_B 502, connect the transmission/reception unit_B 506 and the direct transmission/reception unit_B 508 to the transmission/reception antenna_B 500.

The transmission/reception unit_B 506 is a function unit configured to transmit/receive radio communication data through the LTE access scheme. The transmission/reception unit_B 506 is configured of a transmitter and a receiver; the transmitter can transmit control ation through an LTE base station, and the receiver can transmit data or control information through the LTE base station.

The direct transmission/reception unit_B 508 is a function unit capable of directly communicating with another UE without passing through LTE base stations regarding data or control information. The direct ission/reception unit_B 508 is configured of a direct transmitter and a direct receiver. The direct transmitter can transmit data or control information without passing through an LTE base station, and the direct receiver can receive data or control ation without passing through an LTE base station. The transmission/reception unit_B 506 and the direct transmission/reception unit_B 508 may be configured as a single transmission/reception unit.

Note that antennas may be ed to each of the transmission/reception unith 506 and the direct transmission/reception unit_B 508, and data may be transmitted/received under the control of the control unit_B 502.

The storage unit_B 540 is a function unit configured to store programs, data, and the like necessary for each operation of the UE_A 8. The storage unit 313 is constituted of, for example, a semiconductor memory, a Hard Disk Drive (HDD), or the like.

Furthermore, the storage unit_B 540 stores a UE context_B 542.

The UE context_B 542 may be configured to include a UE context for each UE, a UE context for each PDN connection, and a UE context for each bearer. illustrates the UE context for each UE. The UE context for each UE may be configured to include IMSI, EMM, a State, GUTI, an ME Identity, and a ProSe y.

IMSI is identification information to be assigned to a user (subscriber) using the UE_A 8. IMSI may be identification ation indicating a line contract, and may be stored in a SIM card.

The EMM State tes a ty management state ofthe UE_A 8.

For example, the EMM State may be EMM-REGISTERED in which the UE_A 8 is registered with the network (registered state) or EMM-DEREGISTERD in which the UE_A 8 is not registered with the network (deregistered state).

GUTI is an abbreviation of "Globally Unique Temporary Identity," and is temporary identification information on the UE_A 8. GUTI is constituted of the identification information (Globally Unique MME identifier (GUMMEI)) on MME (e.g. the MME_A 40) and the identification information (M-TMSI) on the UE_A 8 in specific MME (e.g. the MME_A 40).

The ME identity is an ID of ME, and may be IMEI/IMISV, for example.

Here, ME may be UE.

The ProSe ability is identification information indicating the inclusion of a communication on using ProSe. Furthermore, the ProSe y may be identification information indicating the inclusion of a function to receive and detect an announcing signal transmitted by proximity UE, or identification ation indicating a on capable of becoming Remote UE and establishing a PDN connection to the network via a direct communication path with proximity Relay UE. Furthermore, there may be different pieces of identification ation in accordance with these capabilities, and the ProSe ability may be identification information in which the above pieces of identification information are combined. illustrates the UE context for each PDN connection. In the UE context for each PDN connection, there are stored a PDN connection ID, a PDN connection type, an Application ID, a ProSe Application User ID, APN, an IP address, a Default bearer, a Group ID, a ProSe Remote UE ID, a Relay Service Code, and a Timer.

The PDN connection ID is identification information for identifying a PDN connection. For example, in a case that the UE_B 9 establishes a PDN connection via a direct communication path of ProSe with the Relay UE, the same information as that of the PDN connection ID stored in the PDN_A 5 may be stored. In on, the PDN connection ID stored in the UE_B 9 may be the same information as the information stored in the UE___A 8.

The PDN connection type may be information to te r the PDN connection identified by the PDN connection ID is a PDN connection for the terminal itself ofthe d art or a PDN tion Via the Relay UE. To be c, "Normal" in the case of a PDN connection for the terminal itself, "by Relay UE" in the case of a PDN connection for the Remote UE, or the like connection type may be indicated. Furthermore, the information on the PDN of PDN may be ed in the PDN connection ID. In such case, the type connection may be identified based on the PDN connection ID.

The Application ID may be an Application ID for identifying the application that is used when the UE_B 9 establishes a direct communication path with proximity Relay UE.

The ProSe Application User ID is identification information to identify a user that has been assigned from a ProSe application server to perform a Relay function using ProSe ofthe UE_B 9. The ProSe Application User ID is information that is stored in the ProSe application server while being related to user information in the application layer.

APN indicates a connection destination of the UE_B 9. This APN may be constituted of fication information on the network and identification information on a default operator.

The IP Address is an IP address assigned to the UE_B 9 for the PDN connection, and may be an IPv4 address or an IPv6 prefix.

The t Bearer is EPS bearer identification information for identifying a default bearer in this PDN connection.

The Group ID is identification information of a group to which the UE_B 9 belongs. The Group ID may be fication information of a group in which a ProSe function is available. The Group ID may be, when the UE_B 9 performs -many communication, a transmission destination address in the layer 2 to which the transmission from the Relay UE is made.

The ProSe Remote UE ID is identification information identifying the UE_B 9. The ProSe Remote UE ID may be information telling, to the ProSe function unit, that it is authorized to function as Remote UE. To rephrase, UE having been assigned the ProSe Remote UE ID, detects the Relay UE as Remote A1 2016/069245 UE from the ProSe function unit and establishes a direct communication path with the Relay UE, whereby stated UE may t with the network.

Note that a ProSe UE ID in place of the ProSe Remote UE ID may be stored in the storage unit.

The ProSe UE ID is fication information fying the UE_B 9 in the link layer. The ProSe UE ID may be information indicating that the terminal device has a ProSe function. To rephrase, UE having been assigned the ProSe UE ID can detect a proximity terminal using the ProSe function.

The ProSe Remote UE ID and the ProSe UE ID are not transmitted in direct ication for detecting a proximity terminal, but are used to obtain the Relay Service Code which is used by UE_B 9 to detect a proximity terminal. id="p-137" id="p-137" id="p-137" id="p-137" id="p-137"

[0137] The Relay Service Code is a code indicating a connection service in which the UE_B 9 is provided with a network relay with a proximity terminal device from the Relay UE.

In addition, the Relay Service Code is used when the UE_B 9 monitors an announcing signal transmitted from proximity Relay UE in the ity terminal detection procedure ofthe Model A. In other words, the UE_B 9 detects the Relay UE by detecting the reception ofthe announcing signal including the Relay Service Code. The Relay Service Code may be a code reported from the ProSe function unit.

Alternatively, the Relay Service Code is a code that is used when the UE_B 9 announces that a proximity terminal having a relay function is being searched for in the proximity terminal detection procedure of the Model B. In other words, the UE_A 8 transmits, to proximity Relay UE, an announcing signal ing the Relay Service Code and es a Response therefrom, whereby the UE_A 8 detects the proximity terminal. The Relay Service Code may be a code reported from the ProSe function unit.

Further, the Relay Service Code may be a connection service of an ation for disaster prevention communication (Public Safety), or may be information in which different codes are related to respective applications so that the applications can be identified.

The Timer is a timer related to the Relay Service Code and indicates a period oftime during which the Relay Service Code is valid. illustrates the UE context for each bearer. In the UE context for each bearer, at least transfer path identification information and a Transaction ID may be stored.

The transfer path fication information may be information for identifying a bearer. Specifically, the transfer path identification information may be a bearer ID of a dedicated bearer, for example.

The ction ID is information for identifying the communication using a bearer. id="p-145" id="p-145" id="p-145" id="p-145" id="p-145"

[0145] 1.2.3 ration of ProSe on Unit illustrates a device configuration ofthe ProSe function unit_A 7 in the present embodiment.

The ProSe function unit_A 7 is a server device configured to m management and authentication of services supplied by ProSe such as proximity terminal detection and direct communication between the terminals, and is a device managed by a mobile network operator.

The ProSe function unit_A 7 is constituted of a network connection unit_C 700, a control unit_C 702, and a storage unit_C 740. The network connection unit_C 700 and the storage unit_C 740 are connected by a bus via the control unit_C 702.

The control unit~C 702 is a function unit for controlling the ProSe function unit_A 7. The control unit_C 702 is a function unit red to read out and execute various kinds of programs stored in the e unit_C 740.

The k connection unit_C 700 is a function unit for the ProSe function unit_A 7 to connect to the IP mobile communication network 3. Note that the network connection unit_C 700 may be configured to include a transmission/reception unit for respective function units in the IP mobile communication network 3.

A1 2016/069245 The storage unit_C 740 is a function unit configured to store programs, data, and the like necessary for each operation of the ProSe function unit_A 7.

The storage unit_C 740 is constituted of, for example, a semiconductor memory, a Hard Disk Drive (HDD), or the like.

Furthermore, the storage unit_C 740 may store a UE context_C 742.

Alternatively, in the storage unit_C 740, it is sufficient that various kinds of information ts, not limited to the UE context_C742, are .

The UE context_C 742 may be red to include a UE context for each UE and a UE context for each Relay Service. illustrates the UE context for each UE. The UE context for each UE is information on the ProSe function obtained from HSS. id="p-153" id="p-153" id="p-153" id="p-153" id="p-153"

[0153] Specifically, the UE context for each UE may be configured to include IMSI, GUTI, an ME Identity, and a ProSe ability, for e.

IMSI is identification information to be assigned to a user (subscriber) using the UE_A 8. IMSI may be identification information indicating a line contract, and may be stored in a SIM card.

GUTI is an abbreviation of "Globally Unique Temporary Identity," and is temporary identification information on the UE. GUTI is constituted of the fication information lly Unique MME identifier (GUMMEI)) on MME (e.g. the MME_A 40) and the fication information (M-TMSI) on the UE_A 8 in specific MME (e.g. the MME_A 40).

The ME identity is an ID of ME, and may be IMEI/IMISV, for example.

Here, ME may be UE.

The ProSe ability is identification information indicating the inclusion of a communication function using ProSe. In addition, the ProSe ability may be identification information ting the inclusion of a function to transmit an announcing signal toward proximity UE, identification information indicating a function capable of ing the announcing signal transmitted from the proximity UE, identification information indicating a on capable of becoming a relay terminal between a proximity terminal and the network, or identification information indicating a function capable of establishing a PDN tion, as Remote UE, via a proximity terminal. Furthermore, there may be different pieces tification information for each of these capabilities, and the ProSe ability may be identification information in which the above pieces of identification information are combined. illustrates the UE context for each Relay service. The UE context for each Relay Service may be configured to e an Application ID, a Discovery authorization info, a Group ID, a Relay Service Code, a Timer, and Relay/Remote UE info.

The Application ID is information identifying an application that the PDN connection can use. In the case where Remote UE of a proximity terminal ts with this PDN tion, the storage unit may store the Application ID for identifying the application to be used by the proximity terminal. To rephrase, the Application ID for identifying the application by which the UE_A 8 establishes a direct communication path with the proximity terminal may be stored in the storage unit. The ation ID may be service identification information identifying the service. id="p-160" id="p-160" id="p-160" id="p-160" id="p-160"

[0160] The Discovery authorization info is information on authentication for ity terminal detection of UE managed by the ProSe function unit_A 7.

Specifically, the Discovery authorization info may be authentication information indicating that the ProSe function unit_A 7 has authenticated that UE detects a ity terminal expected to become Relay UE, authentication information ting that the ProSe function unit_A 7 has authenticated that UE is detected by a proximity terminal through transmitting announcement to Remote UE, or the like.

The Group ID is identification information of a group to which UE belongs. The Group ID may be identification information of a group in which a ProSe function is available. The Group ID may be, when UE performs one-to—many communication, a transmission ation address in the layer 2 to which the Relay UE transmits. id="p-162" id="p-162" id="p-162" id="p-162" id="p-162"

[0162] The Relay e Code is identification information identifying tivity that is provided to UE by the service. The Relay Service Code which is the same as the Relay Service Code stored in UE may be stored.

The Timer is a timer related to the Relay Service Code. The Timer indicates a period oftime during which the Relay Service Code is valid.

The Relay/Remote UE info is information on UE as a direct communication destination of the UE context. In other words, in the case ofthe UE context being a t for Relay UE, the Remote UE info is stored in the storage unit; in the case ofthe UE context being a context for Remote UE, the Relay UE info is stored. id="p-165" id="p-165" id="p-165" id="p-165" id="p-165"

[0165] In addition, the above-mentioned information may be a ProSe Remote UE ID, ProSe Relay UE ID, or ProSe UE ID of each terminal device. 1.2.4 ration of HSS illustrates a device configuration of the HSS_A 50 in the present embodiment. The HSS_A 50 is a server device configured to manage subscriber information. Furthermore, the HSS_A 50 manages permission information and the like, for service supply of communication services including ProSe, and the like. id="p-167" id="p-167" id="p-167" id="p-167" id="p-167"

[0167] The HSSiA 50 is constituted of a k connection unit_D 900, a control unit_D 902, and a storage unit_D 940. The network connection unit_D 900 and the storage unit_D 940 are connected by a bus via the control unit_D 902. id="p-168" id="p-168" id="p-168" id="p-168" id="p-168"

[0168] The control unitfiD 902 is a function unit for controlling the HSS_A 50.

The control unit_D 902 is a function unit red to read out and execute various kinds of programs stored in the storage unit_D 940.

The network connection unit_D 900 is a function unit for the HSS_A 50 to connect with the IP mobile communication network 3. Note that the network connection unit_D 900 may be configured to include transmission/reception units corresponding to respective function units in the IP mobile ication k 3. id="p-170" id="p-170" id="p-170" id="p-170" id="p-170"

[0170] The storage unit_D 940 is a function unit for storing ms, data, and the like necessary for each ion of the HSS_A 50. The storage unit 707 is constituted of, for example, a nductor memory, a Hard Disk Drive (HDD), or the like.

Furthermore, the e unit_D 940 may store HSS data_D 942. The storage unit_D 940 may manage stated HSS data as subscriber information for each UE.

The HSS data_D 942 is configured to include the HSS data for each UE and the HSS data for each PDN tion. id="p-173" id="p-173" id="p-173" id="p-173" id="p-173"

[0173] A illustrates the HSS data for each UE. As illustrated in A, the HSS data for each UE may include IMSI, MSISDN, IMEI/IMEISV, an Access Restriction, a ProSe capability, and a PLMN list.

IMSI is identification ation to be assigned to a user (subscriber) using the UE_A 8. IMSI may be identification information indicating a line contract, and may be stored in a SIM card. MSISDN represents the phone number of UE. MISV is identification information ed to UE. The Access Restriction indicates registration information for access restriction. id="p-175" id="p-175" id="p-175" id="p-175" id="p-175"

[0175] The ProSe capability indicates whether UE has a ProSe function. Here, the ProSe function refers to proximity terminal detection capability and direct communication capability with a proximity terminal. In other words, in the case where the ProSe capability is included in the HSS data for each UE, UE can detect a proximity terminal or can be detected by the proximity terminal using ProSe, and can perform direct communication with the proximity terminal. In addition, the ProSe capability may be information indicating sion to provide a network connection service to a proximity terminal by performing direct communication with the proximity terminal. Alternatively, the ProSe capability may be information indicating permission to be provided with the network connection service by performing direct ication with the proximity terminal. Alternatively, both pieces of the above-mentioned information may be ed.

The PLMN list is a list of PLMNs in which UE is permitted to detect a proximity terminal. In addition, the HSS_A 50 may store authentication information including the PLMN list. The HS S_A 50 may notify the ProSe Al PCT/JP2016/O69245 function unit of a PLMN ID permitted for UE in response to the t from the ProSe function unit.

Although the respective constituent elements of the HSS data for each UE have been discussed so far, the HSS data for each UE is not d thereto, and the constituent elements including other pieces of information may be B illustrates the HSS data for each PDN connection. The HSS data for each PDN connection is configured of a Context ID, a PDN address, a PDN Type, a PDN connection Type, APN, and a PDN GW ID.

The Context ID is information identifying a context including the HSS data for each PDN. id="p-180" id="p-180" id="p-180" id="p-180" id="p-180"

[0180] The PDN Address indicates an IP address with which UE is registered when establishing a PDN connection.

The PDN Type indicates the type of PDN Address. That is, the PDN Type is identification information for identifying IPv4, IPv6, or IPv4v6, for example.

The PDN connection type may be information indicating whether the PDN connection identified by the PDN connection ID is a PDN connection for the terminal itself ofthe related art, a PDN tion for Remote UE, or a PDN tion provided by Relay UE. To be specific, l" in the case of a PDN connection for the terminal itself, "for Remote UE" in the case of a PDN connection for the Remote UE, "by Relay UE" in the case of a PDN connection ed by the Relay UE, or the like may be indicated. Furthermore, the information on the PDN connection type may be included in the PDN connection ID. In such case, the type of PDN connection may be identified based on the PDN connection ID.

APN indicates a connection destination of the UE_A 8. This APN may be tuted of identification information on the network and identification information on a default operator.

The PDN GW identity is identification information for identifying PGW utilized in this APN. This identification information may be a Fully Qualified Domain Name (FQDN) or an IP address.

Although the respective constituent elements of the HSS data for each PDN connection have been discussed so far, the HSS data for each PDN connection is not limited thereto, and the constituent elements including other pieces of information may be stored. 1.2.5 Configuration of ProSe Application Server illustrates a device configuration ofthe ProSe application server_A 2 in the t embodiment. The ProSe application server_A 2 is an application server related to ProSe, and may be a server device configured to link and manage user information in the application layer and permission information such as Permission info, store the permission information for each user, and the like.

The ProSe application server_A 2 is constituted of a network connection unit_E 1100, a control unit_E 1102, and a storage unit_E 1140. The k connection unit_E 1100 and the storage unit_E 1140 are connected by a bus via the control unit_E 1102.

The control unit_E 1102 is a function unit to control the ProSe application server_A 2. The control unit_E 1102 is a function unit to read out and execute various kinds of programs stored in the storage unit_E 1140.

The network connection unit_E 1100 is a on unit for the ProSe application server_A 2 to connect with the 1P mobile communication network 3.

Note that the network connection unit_E 1100 may be configured to include transmission/reception units ponding to respective on units in the 1P mobile communication network 3.

The storage unit_E 1140 is a function unit configured to store programs, data, and the like necessary for each ion of the ProSe application _A 2. The storage unit_E 1140 is constituted of, for example, a semiconductor memory, a Hard Disk Drive (HDD), or the like.

WO 02843 A1 Furthermore, the storage unit_E 1140 may store a UE context_E 1142.

Alternatively, in the storage unit_E 1140, it is sufficient that various kinds of information elements, not limited to the UE context_E 1142, are stored.

Note that the UE context_E 1142 at least includes a UE context for each user.

A illustrates the UE context for each user. The UE context_E 1142 for each user is configured to include an Application Layer User ID, a ProSe Function ID, an Application ID, a ProSe Application User ID, and Permission info.

The Application Layer User ID is user identification information in the application layer. id="p-195" id="p-195" id="p-195" id="p-195" id="p-195"

[0195] The ProSe Function ID is identification information identifying the ProSe function unit having an ticated user. The ProSe Function ID may be a Fully Qualified Domain Name (FQDN) or an IP address.

The Application ID is ation to identify an application configured to provide the ProSe service to the user.

The ProSe ation User ID (PAUID) is information identifying the user, and is also information that is stored being linked with the ation Layer User ID. This information may be the same as the ProSe ation User ID stored in the ProSe function unit.

The Permission info is information indicating permission information of the ProSe function for each user. Specifically, the Permission info may be managed using a management table as illustrated in B, for example.

In an example illustrated in B, the permission information managed by the Permission info may be managed for a Remote UE function and a ProSe Relay UE function. id="p-200" id="p-200" id="p-200" id="p-200" id="p-200"

[0200] Here, the Remote UE function indicates a function that can detect, as Remote UE, a proximity terminal expected to become Relay UE, and can use a PDN connection provided to the Relay UE.

In the example of B, a user assigned PAUID (A) is not permitted the use of the Remote UE function, but is permitted the use ofthe ProSe Relay UE function. Furthermore, a user assigned PAUID (B) is permitted the use of the Remote UE function, but is not ted the use of the ProSe Relay UE function.

Furthermore, the ProSe Relay UE function indicates a function that can become Relay UE and provide a network connection service to a ity terminal.

In addition, the Permission info may include a Discovery Type permitted for the user.

To be specific, information indicating that a Discovery procedure is a method in which Relay UE is detected by Remote UE receiving a signal announced from the Relay UE, may be included in the permission info.

Alternatively, information indicating that the Discovery procedure is a detection method in which the Relay UE is detected by the Remote UE receiving a se transmitted from the Relay UE based on Solicitation information transmitted from Remote UE, may be included in the permission info. Furthermore, they may be stored corresponding to the respective functions (the Remote UE function and the ProSe Relay UE function). id="p-206" id="p-206" id="p-206" id="p-206" id="p-206"

[0206] 1.3 Description of Processing Hereinafter, the ew of processing described in the present embodiment will be described. 1.3.1 Service Authentication Procedure Each of the UE_A 8 and the UE__B 9 performs an authentication ure for terminal detection (ProSe Direct Discovery) provided as a ProSe service, ication using a direct ication path (ProSe Direct Communication), and the like. id="p-208" id="p-208" id="p-208" id="p-208" id="p-208"

[0208] Furthermore, the UE_A 8 performs an authentication procedure for usage of the ProSe Relay UE function as a ProSe service, and the UE_B 9 performs an authentication ure for usage of the Remote UE function.

WO 02843 A1 The proximity terminal detection and the communication using a direct communication path may each be authenticated by different procedures, or may be authenticated by a single authentication ure.

The authentication of the ProSe Relay UE function or the tication of the Remote UE function may be authenticated along with the proximity terminal detection and the authentication procedure for the communication using a direct communication path, or may be authenticated by a different procedure.

Note that in the following service authentication ures, the UE_A 8 and the UE_B 9 are positioned within ge (within a communication range) of a base station. id="p-212" id="p-212" id="p-212" id="p-212" id="p-212"

[0212] 1.3.1.1 Relay UE Service Authentication Procedure A Relay UE authentication procedure in the t embodiment will be described with nce to .

First, the UE_A 8 to become Relay UE performs an attach procedure to connect with a core network (81302). As a result of performing the attach procedure, the UE_A 8 establishes a PDN connection with the PGW_A 30. The PDN connection refers to a communication path through which data is itted/received n the UE_A 8 and the PDN 5. The attach procedure may be performed as an initial procedure at a time when the UE_A 8 powers on, or the like.

More specifically, a description will be given using the attach procedure.

The procedure is started by the UE_A 8 transmitting an attach request to the MME_A 40. The attach request may be transmitted including identification information of UE such as APN or IMSI. Note that APN need not be included in the attach request message, and may be reported to the MME_A 40 from the UE_A 8 with a control message in the attach procedure.

Furthermore, the UE_A 8 may request a PDN connection of the related art or may request a PDN connection used in the UE-to-NW Relay. The UE_A 8 may include, in the attach request message, identification information indicating whether the PDN connection of the related art is requested or the PDN connection used in the UE-to—NW Relay is requested.

The MME_A 40 selects the PGW_A 30 based on the received APN, and determines an anchor node of the PDN connection for the UE_A 8. Furthermore, the MME_A 40 permits the establishment of the PDN connection and the connection to the core network, and transmits, to the UE_A 8, an attach accept message as a response to the attach request message. Note that the attach accept message may be transmitted from the MME_A 40 directly to the UE_A 8 or may be transmitted through the eNB_A 45 included in the LTE AN_A 80.

Note that, in a case where the MME_A 40 ticates that, in a security tication procedure with the HSS_A 50, the UE_A 8 is Relay UE, the MME_A 40 may permit the establishment of the PDN connection for the UE-to—NW Relay and transmit the attach accept message as the response to the attach request e including the stated permission information.

Alternatively, the MME_A 40 may permit, based on APN included in the attach request transmitted from the UE_A 8, the establishment of the PDN connection for the UE—to—NW Relay and transmit the attach accept e as the response to the attach request message including the stated permission information.

The MME_A 40 may notify the UE_A 8 that the UE_A 8 is permitted ting to the core network by transmitting the attach accept message. rmore, the MME_A 40 may notify the UE_A 8 that the PDN connection is established by transmitting the attach accept message. The attach accept message may be itted including the IP address related to the PDN connection or APN. id="p-220" id="p-220" id="p-220" id="p-220" id="p-220"

[0220] Furthermore, the MME_A 40 may transmit the attach accept message including the ProSe UE ID. Note that the ProSe UE ID is identification information of a terminal assigned to UE having the ProSe function. For e, the MME_A 40 may it the attach accept message including the ProSe UE ID, based on the fact that APN transmitted by the UE_A 8 in the attach procedure is identified as APN related to the ProSe service. At this time, the MME_A 40 may assign the ProSe UE ID to the UE_A 8. Furthermore, this information may be obtained from the HSS_A 50. In this case, the HSS_A 50 or the like may store the ProSe UE ID ed in subscriber information in In addition, the ProSe UE ID may be a ProSe Relay UE ID. That is, the MME_A 40 may e the ProSe Relay UE ID in the attach accept e, based on the fact that the identification information ofthe UE_A 8 is identified as being related to the Relay UE on.

Next, the UE_A 8 transmits a ProSe registration request to the ProSe function unit_A 7 ($1304). The ProSe ration request may be a ProSe registration request message requesting, to the ProSe function unit_A 7, that the UE_A 8 should be registered as UE having the ProSe function. The UE_A 8, by transmitting the ProSe registration request message, may request permissions for proximity terminal detection and communication using a direct communication path, and may request the usage of the Relay UE function. The UE_A 8 may transmit the ProSe registration request message including pieces of information each identifying permission ofthe proximity terminal ion, permission of the communication using a direct ication path, and permission of usage of the Relay UE function, and may request the above-mentioned permissions.

The UE_A 8 may transmit the ProSe registration request using the PDN connection established in the attach procedure. In addition, the UE_A 8 may transmit the ProSe registration request message with the IP address obtained in the attach procedure as a transmission source address.

Furthermore, the ProSe function unit_A 7 as a transmission destination of the ProSe registration request message may store, in e, information of the ProSe function unit_A 7 corresponding to a Home PLMN which is a network operator to make a contract with, and the information may be used as the transmission destination.

Alternatively, a list of network operators capable of providing the ProSe service may be stored as a local PLMN, and ation on the ProSe function unit_A 7 corresponding to the local PLMN may also be stored, so as to be used as the transmission destination.

The local PLMN may be a freely-selected network operator determined by a contract relationship with the Home PLMN, or may be a network or running the network in the same country along with the Home PLMN.

As sed above, the UE_A 8 may store a PLMN ID for identifying the PLMN and the ProSe function unit_A 7 while making them correspond to each other, and may request authentication using this information as the transmission destination.

Moreover, the PLMN ID and the information of the ProSe function unit_A 7 may be obtained from the Home PLMN. For example, inquiries may be sent to the ProSe function unit_A 7 ofthe Home PLMN, and desired information may be obtained and stored in accordance with the response to the inquiries. id="p-229" id="p-229" id="p-229" id="p-229" id="p-229"

[0229] The ProSe function unit_A 7 may receive the ProSe registration t, and may authenticate the ity terminal detection, the communication using a direct communication path, and the relay ication using the Relay UE function ($1306). Based on the tication, the ProSe function unit_A 7 may assign the ProSe Relay UE ID to the UE_A 8.

In addition, the ProSe function unit_A 7 may request, in a case where the UE context is not stored in the ProSe function unit, the registration information of UE associated with ProSe to the HSS_A 50. id="p-231" id="p-231" id="p-231" id="p-231" id="p-231"

[0231] In a case where the ProSe function unit_A 7 cannot ticate, for the UE_A 8, the relay communication using the Relay UE function, the ProSe function unit_A 7 may not assign the ProSe Relay UE ID to the UE_A 8.

The ProSe function unit_A 7 may transmit an authentication request to the ProSe application server_A 2 as needed. Specifically, the ProSe function unit_A 7 may request the ProSe application server-A 2 to authenticate the UE_A 8 based on an or policy or a network policy. The ProSe function unit_A 7 may transmit an authentication request message including the ProSe Relay UE ID to the ProSe application server_A 2.

The ProSe application server_A 2 may authenticate the proximity al detection, the communication using a direct communication path, and the relay communication using the Relay UE function for the UE_A 8, based on receiving the authentication request message or based on receiving the ProSe Relay UE ID.

The ProSe function unitfiA 7 may transmit a ProSe registration response based on the authentication (S1308). The ProSe registration response may be a Response message to the ProSe registration request received from the UE_A 8.

The ProSe registration se may be transmitted including the authentication result. The ProSe function unit_A 7 may store information for the authentication while making the stated ation correspond to the UE_A 8, and may determine whether the authentication result is successful or unsuccessful based on the information.

The ProSe function unit_A 7 may transmit, to the UE_A 8, the ProSe registration response including the ProSe Relay UE ID based on receiving the ProSe registration request. The ProSe Relay UE ID may be an ID corresponding to the UE_A 8, and the UE_A 8 may use the ProSe Relay UE ID as information for identifying the terminal in the case of ming the proximity terminal detection, notifying the proximity terminal of the presence of the UE_A 8 itself, or the like. To be more specific, the UE_A 8 may transmit the announcing signal including the ProSe Relay UE ID.

The ProSe function unit_A 7 may report the failure of authentication by not ing the ProSe Relay UE ID in the Response message. [023 8] The UE_A 8 receives the ProSe registration response and obtains the authentication result. In addition, the UE_A 8 may obtain and store the ProSe Relay UE ID included in the ProSe registration response. id="p-239" id="p-239" id="p-239" id="p-239" id="p-239"

[0239] The UE_A 8 may also receive, from the ProSe function unit_A 7, a timer corresponding to the service and indicating a period of time during which the tication of the service is valid. The UE_A 8 may start counting in a case of receiving the timer. Furthermore, in a case where the counting is ended, the e tication request may be transmitted again to the ProSe function unit_A 7. atively, the service authentication t may be transmitted based on the request from the network during the counting of the timer. 1.3.1.2 Remote UE Service Authentication ure A Remote UE service authentication procedure in the present embodiment will be described with reference to .

First, the UE_B 9 to become Remote UE performs the attach procedure to connect with the core network (S1302). As a result of performing the attach procedure, the UE_B 9 establishes a PDN connection with the PGW_A 30. The PDN connection refers to a ication path through which data is transmitted/received between the UE_B 9 and the PDN 5. The attach procedure may be performed as an initial procedure at a time when the UE_B 9 powers on, or the like.

More specifically, a description will be given using the attach procedure.

The procedure is started by the UE_B 9 transmitting an attach request to the MME_A 40. The attach t may be transmitted ing identification information of UE such as APN or IMSI. Note that APN need not be included in the attach t message, and may be reported to the MME_A 40 from the UE_B 9 with a l message in the attach procedure.

The MME_A 40 selects the PGW"A 30 based on the received APN, and determines an anchor node of the PDN connection for the UE_B 9. Furthermore, the MME_A 40 permits the establishment of the PDN connection and the connection to the core k, and transmits, to the UE_A 8, an attach accept message as a se to the attach request message. Note that the attach accept e may be transmitted from the MME_A 40 ly to the UE_A 8 or may be transmitted through the eNB_A 45 included in the LTE AN_A 80.

The MME_A 40 may notify the UE_B 9 that the UE_B 9 is permitted connecting to the core network by transmitting the attach accept message.

Furthermore, the MME_A 40 may notify the UE_B 9 that the PDN connection is established by transmitting the attach accept message. The attach accept message may be transmitted including the IP address related to the PDN connection or APN, or the like.

Furthermore, the MME_A 40 may transmit the attach accept message including the ProSe UE ID. Note that the ProSe UE ID is identification information of a terminal assigned to UE having the ProSe function. For example, the MME_A 40 may transmit the attach accept message including the ProSe UE ID, based on the fact that APN transmitted by the UE_A 8 in the attach procedure is identified as APN d to the ProSe e. At this time, the MME_A 40 may assign the ProSe UE ID to the UE_B 9. Furthermore, this information may be obtained from the HSS_A 50. In this case, the HSS_A 50 or the like may store the ProSe UE ID included in subscriber information in advance.

In addition, the ProSe UE ID may be a ProSe Remote UE ID. That is, the MME_A 40 may e the ProSe Remote UE ID in the attach accept message, based on the fact that the identification information of the UE_B 9 is identified as being related to the Remote UE function.

Next, the UE_B 9 transmits a ProSe registration request to the ProSe function unit_A 7 ($1304). The ProSe registration request may be a ProSe registration request message requesting, to the ProSe function unit_A 7, that the UE_B 9 should be registered as UE having the ProSe function. The UE_B 9 may request, by transmitting the ProSe registration request message, permissions to perform proximity terminal detection, perform communication using a direct communication path, and access the network using a relay service by the Remote UE function. The UE_B 9 may transmit the ProSe registration request message including pieces of information each identifying permission of the proximity terminal detection, permission ofthe communication using a direct ication path, and access to the network using the relay service by the Remote UE function, and may request these sions individually. id="p-248" id="p-248" id="p-248" id="p-248" id="p-248"

[0248] The UE_B 9 may transmit the ProSe registration request using the PDN tion established in the attach procedure. In addition, the UE_B 9 may transmit the ProSe registration request message with the IP address obtained in the attach ure as a transmission source s. id="p-249" id="p-249" id="p-249" id="p-249" id="p-249"

[0249] Furthermore, the ProSe on unit_A 7 as a transmission destination ofthe ProSe registration request message may store, in advance, information of the ProSe on unit_A 7 corresponding to a Home PLMN which is a network operator to make a contract with, and the information may be used as the transmission destination. atively, a list of network operators capable of providing the ProSe service may be stored as a local PLMN, and information ofthe ProSe function A1 2016/069245 unit_A 7 corresponding to the local PLMN may also be stored, so as to be used as the transmission destination.

The local PLMN may be a freely—selected network operator determined by a contract relationship with the Home PLMN or the like, or may be a network operator running the network in the same country along with the Home PLMN.

As discussed above, the UE_B 9 may store a PLMN ID for identifying the PLMN and the ProSe function unit_A 7 while making them correspond to each other, and may request authentication using this information as the transmission destination.

Moreover, the PLMN ID and the information of the ProSe function unit_A 7 may be obtained from the Home PLMN. For e, inquiries may be sent to the ProSe function unit_A 7 ofthe Home PLMN, and desired ation may be obtained and stored in ance with the response to the inquiries.

The ProSe function unit_A 7 may e the ProSe registration request, and may authenticate the proximity terminal detection, the communication using a direct communication path, and the relay communication using the Remote UE function ($1306). Based on the authentication, the ProSe function unit_A 7 may assign the ProSe Remote UE ID to the UE_A 8. id="p-255" id="p-255" id="p-255" id="p-255" id="p-255"

[0255] In on, the ProSe function unit_A 7 may request, in a case where the UE context is not stored in the ProSe function unit, the registration information of UE associated with ProSe to the HSS_A 50.

In a case where the ProSe function unit_A 7 cannot authenticate, for the UE_B 9, the relay communication using the Remote UE function, the ProSe function unit_A 7 may not assign the ProSe Remote UE ID to the UE_B 9.

The ProSe function unit_A 7 may transmit an authentication request to the ProSe application server_A 2 as . The ProSe function unit_A 7 may transmit an authentication request message including the ProSe Application User ID.

WO 02843 A1 The ProSe application server_A 2 may authenticate the proximity terminal ion, the communication using a direct communication path, and the relay communication using the Remote UE function for the user, based on ing the authentication request message or based on receiving the ProSe Application User ID.

The ProSe function unit_A 7 may transmit a ProSe registration response based on success in the authentication ($1308).

The ProSe registration response may be transmitted including the authentication result. The ProSe on unit_A 7 may store information for the authentication while making the stated information correspond to the UE_B 9, and may determine whether the authentication result is successful or unsuccessful based on the information. id="p-261" id="p-261" id="p-261" id="p-261" id="p-261"

[0261] The ProSe function unit_A 7 may transmit, to the UE_B 9, the ProSe registration response including the ProSe Remote UE ID based on receiving the ProSe ration request. The ProSe Remote UE ID may be an ID corresponding to the UE_B 9, and the UE_B 9 may use the ProSe Remote UE ID as ation for identifying the terminal in the case of performing the proximity terminal ion, or notifying the proximity terminal of the transmit a presence ofthe UE_B 9 itself. To be more specific, the UE_B 9 may ProSe direct communication path establishment request with the UE_A 8, including the ProSe Remote UE ID therein. id="p-262" id="p-262" id="p-262" id="p-262" id="p-262"

[0262] The ProSe function unit_A 7 may transmit, to the UE_B 9, the ProSe registration response including the ProSe UE ID. The ProSe UE ID is identification ation identifying the UE_B 9. The ProSe UE ID may be information indicating that the terminal device has a ProSe function. To rephrase, UE having been assigned the ProSe UE ID can detect a proximity terminal using the ProSe function.

The UE_B 9 receives the ProSe registration response and obtains the authentication result. In addition, the UE_B 9 may obtain and store the ProSe Remote UE ID or the ProSe UE ID included in the ProSe registration se.

The UE_B 9 may also receive, from the ProSe on unit_A 7, a timer corresponding to the service and indicating a period of time during which the tication of the service is valid. The UE_B 9 may start counting in a case of receiving the timer. rmore, in a case where the counting is ended, the service authentication request may be transmitted again to the ProSe function unit_A 7. atively, the service authentication request may be transmitted based on the request from the network during the counting of the timer. 1.3.2 Discovery Request Procedure An authentication procedure in which respective pieces of UE (Relay UE and Remote UE) start a Discovery procedure by announcing or monitoring will be described next.

The respective pieces of UE may start the following procedure on the tion that the stated pieces of UE have succeeded in obtaining service authentication in an attach procedure. id="p-267" id="p-267" id="p-267" id="p-267" id="p-267"

[0267] 1 Announcing Request Procedure First, a procedure in which the UE_A 8 requests announcing will be described. The "announcing" refers to an action in which a terminal notifies r terminal positioned in close proximity of the presence of the al itself.

Hereinafter, a procedure in which the UE_A 8 performs announcing will be described with reference to .

The UE_A 8 configures permission information of the Relay UE function with the ProSe application server_A 2 (S1402).

In the permission information ration ofthe Relay UE function, the UE_A 8 notifies the ProSe application server of information including the ProSe Relay UE ID assigned by the ProSe function unit.

The ProSe application server_A 8, based on receiving the ProSe Relay UE ID, assigns the ProSe ation User ID to the user ID in the application layer. id="p-272" id="p-272" id="p-272" id="p-272" id="p-272"

[0272] Note that the ProSe Application User ID assigned to the UE_A 8 by the ProSe application server_A 2 may be a Restricted ProSe Application User ID for restricted discovery.

Note that the restricted discovery refers to a procedure in which proximity terminal detection is performed with definite permission from UE to be detected.

The ProSe application server_A 2 notifies the UE_A 8 of the ProSe Application User ID assigned to the UE_A 8. Note that the permission ation configuration may be performed before the service authentication procedure or may be performed after that. id="p-275" id="p-275" id="p-275" id="p-275" id="p-275"

[0275] Next, the UE_A 8 transmits a ery request to the ProSe function unit_A 7 (S1404). The ery request may be a discovery request message with which the UE_A 8 requests to start the announcing procedure. Here, the transmission ofthe ery request by the UE_A 8 may be performed under the condition that the service authentication procedure has been completed.

More specifically, the ission may be performed under the condition that the UE_A 8 has been authenticated to perform announcing by the ProSe on unit_A 7 of a Home PLMN which is a k operator to make a contract with. In addition, the transmission may be performed under the condition that the UE_A 8, in a case ofthe completion ofthe authentication, obtains the authentication ation from the ProSe function unit__A 7 and stores the stated tication information.

The discovery request may include the ProSe Application User ID, UE ID, a command indicating the announcing, a discovery type indicating that the discovery is aimed to achieve a UE-to—NW Relay service, and an Application Note that the ProSe Application User ID is information reported from the ProSe application server_A 2 in the permission configuration procedure.

UE ID is identification ation of the UE_A 8, and may be, for example, IMSI. Alternatively, UE ID may be the ME Identity.

The information indicating the request of announcing may be requested, not only by an fying method by the command, but also by transmitting an announcing request message while defining the announcing request message and the like. To be more specific, a message type requesting the announcing WO 02843 Al the message type may be may be defined, and the request message including transmitted.

The discovery type may be information ting that the requested Discovery procedure is aimed to achieve the UE-to-NW Relay service and further ting that it is the discovery made by cing and monitoring (Model A).

Note that the command and/or the ery type may be capability information ting that the UE_A 8 has a relay function for a proximity terminal device and the network. Alternatively, separate from the above-discussed information, the UE_A 8 may indicate the inclusion ofthe relay function for a proximity terminal device and the network.

Note that the UE_A 8 may transmit the discovery t including multiple combinations of ery types and Application IDs.

Specifically, the UE_A 8 may transmit the discovery request including a combination of an Application ID A and a discovery type of "UE-to-NW Relay", and a combination of an Application ID B and "restricted discovery".

Furthermore, the ProSe function unit_A 7 as a transmission ation of the discovery request may store, in advance, information on the ProSe function unit_A 7 of a Home PLMN as a network operator with which the UE_A 8 makes a contract, and the ProSe function unit_A 7 ofthe Home PLMN may be set as the transmission destination.

The UE_A 8 may include APN in the discovery t. APN indicates the network to which the UE_A 8 requests access. id="p-286" id="p-286" id="p-286" id="p-286" id="p-286"

[0286] The ProSe function unit_A 7 confirms whether the UE_fiA 8 is allowed to use a UE—to-NW Relay announcing function, based on the Application ID or UE Furthermore, the ProSe function unit_A 7 confirms whether the UE_A 8 has already been assigned a Relay Service Code and a timer.

Al 2016/069245 The ProSe function unit_A 7 may transmit a discovery request to the application server_A 2 based on a network policy or an or policy.

In this case, the ProSe function unit_A 7 may it the discovery request including the ProSe Application User ID and the discovery type.

The ProSe ation server_A 2, based on receiving the discovery request from the ProSe function unit_A 7, confirms the permission information by the permission info ofthe user identified by the ProSe Application User ID or the like.

When the ProSe application server_A 2 confirms the permission information, the ProSe ation server_A 2 may transmit a discovery response, as a response to the discovery request, to the ProSe function unit_A The discovery response may be a Response message to the discovery request.

The discovery response may include the ProSe Application User ID that is allowed to use the service. Furthermore, the discovery response may include identification information ting that the service is allowed to be used.

The ProSe function unitHA 7 assigns a Relay Service Code and a timer to the UE_A 8, based on the discovery response from the ProSe application server_A 2 or the service permission by the ProSe function unit_A 7.

The Relay Service Code is identification information corresponding to the UE—to—NW Relay service. Furthermore, the Relay Service Code may be temporary identification information which is assigned to the service by the ProSe function unitfiA 7.

Furthermore, the timer is made to correspond to the Relay Service Code, and is a timer configured to indicate a period of time during which the Relay e Code is valid. That is, the announcing using the Relay Service Code is ted until the counting ofthe timer is ended.

Note that, in a case where the discovery type included in the ery request is only "UE-to-NW Relay", the ProSe function unit_A 7 may further assign a ProSe Restricted Code (ProSe Restricted Code A) corresponding to the same Application ID to the UE_A 8 based on the operator policy or network policy. Moreover, the ProSe function unit_A 7 may also assign a timer Al PCT/JP20l6/O69245 corresponding to the ProSe Restricted Code and indicating a period oftime during which the ProSe Restricted Code is valid.

Note that the ProSe Restricted Code is a code used by the ProSe function unit for a ProSe restricted Discovery service, and may correspond to one or multiple ProSe Application User IDs.

The ProSe Restricted Discovery service is a service of detection supported by a terminal device based on explicit permission from the detected al device. For example, the e is such that UE having the monitoring function obtains the ProSe Restricted Code from proximity UE having the announcing on so as to confirm the explicit detection permission, and receives the announcing including the ProSe Restricted Code, thereby detecting the proximity UE. id="p-298" id="p-298" id="p-298" id="p-298" id="p-298"

[0298] Accordingly, the ProSe Restricted Code A is a code assigned to the ProSe Application User ID of the user ofthe UE_A 8.

Note that a timer value corresponding to the ProSe cted Code and indicating a period oftime during which the ProSe Restricted Code is valid and a timer value corresponding to the Relay Service Code and indicating a period of time during which the Relay Service Code is valid may be different from each other or may be the same.

In a case Where a combination of the Application ID A and the discovery type of "UE—to—NW Relay" and a ation of the Application ID B and "restricted discovery" are included in the discovery request, the ProSe function unit_A 7 may further assign the ProSe Restricted Code (ProSe Restricted Code B) to the UE_A 8. Moreover, the ProSe function unit_A 7 may also assign a timer corresponding to the ProSe Restricted Code and ting a period of time during which the ProSe Restricted Code is valid.

Note that the ProSe Restricted Code B is a code ed to the ProSe Application User ID of the user ofthe UE_A 8. id="p-302" id="p-302" id="p-302" id="p-302" id="p-302"

[0302] The ProSe Restricted Code (ProSe Restricted Code B) ed to the UE_A 8 by the ProSe function unit_A 7 in response to the discovery request from the UE_A 8 and the ProSe Restricted Code (ProSe Restricted Code A) assigned to the UE_A 8 not based on the discovery request from the UE_A 8, may be the same or may be different from each other. rmore, the timer corresponding to the ProSe Restricted Code B and the timer corresponding to the ProSe Restricted Code A may be the same or may be ent from each other.

Based on the service permission and the Relay Service Code configuration, the ProSe function unit_A 7 transmits a discovery response to the UE_A 8 (S1410).

A Relay Service Code and a timer corresponding to the code may be included in the discovery response.

In addition, in the case where the ProSe function unit_A 7 assigns the ProSe Restricted Code to the UE_A 8, the ProSe on unit_A 7 may include the ProSe Restricted Code and a timer corresponding to the ProSe Restricted Code in the discovery response.

In other words, the ProSe function unit_A 7 transmits, to the UE_A 8, the discovery response including a Relay Service Code "C1" and a timer "Tl" corresponding to "C1". rmore, the ProSe function unit_A 7 may transmit the discovery the same response including a ProSe Restricted Code "Crl" corresponding to Application ID as the Application ID corresponding to the Relay Service Code "C1" and a timer "Trl" corresponding to "Crl".

Furthermore, the ProSe function unit_A 7 may transmit the discovery to a different se including a ProSe Restricted Code "Cr2" corresponding Application ID from the Application ID corresponding to the Relay Service Code "Cl" and a timer "Tr2" corresponding to "Cr2".

The timers "Tl", "Trl", and "Tr2" may have the same value or may have different .

Next, the UE_A 8 es the discovery response. Furthermore, the UE_A 8 may obtain the ProSe Relay Service Code and a value ofthe timer.

In addition, the UE_A 8 may obtain, in a case of receiving the discovery the ProSe response, the ProSe Restricted Code and the timer corresponding to Restricted Code.

Furthermore, the UE_A 8 determines whether the cing is permitted based on the information included in the discovery response.

In a case where the announcing is ted, the UE_A 8 may assign radio resources ($1412) and transmit a signal including the obtained ProSe Relay Service Code to its proximity. Radio resource information such as frequency and time may be obtained from the ProSe function unit_A 7, or the resources for the announcing may be stored in e and then assigned.

In addition, the UE_A 8 may start counting of the timer based on receiving the discovery response. The UE_A 8 may transmit a signal for the announcing until the timer expires. The announcing is stopped in a case that the timer is ended (the timer expires) like a case in which the value of the timer s zero. Note that the signal for the announcing may be transmitted while ing the ProSe Relay Service Code. rmore, the signal for the announcing may be transmitted while including UE ID and/or the ProSe Relay UE ID. Furthermore, the signal for the announcing may include information for identifying communication capability such as communication capacity ofthe PDN connection ed to Remote UE by the UE_A 8. id="p-316" id="p-316" id="p-316" id="p-316" id="p-316"

[0316] In a case where the UE_A 8 is d that the authentication is essful in the discovery response, the UE_A 8 does not perform ing ofthe radio resources or announcing.

Through the above—discussed procedure, the UE_A 8 can perform the authentication procedure for performing the announcing. 1.3.2.2 Monitoring Request Procedure A procedure in which the UE_B 9 requests monitoring will be described next. The "monitoring" refers to an action in which a terminal notifies another terminal positioned in close proximity of the presence ofthe terminal itself.

WO 02843 Al The UE_B 9, in a case where the UE_B 9 has connectivity to a base station, may beforehand m a monitoring request procedure described below, and may obtain authentication for the monitoring from a server device.

Hereinafter, a procedure in which the UE_B 9 performs monitoring will be described with reference to .

The UE_B 9 configures permission information ofthe Remote UE function with ProSe application server_A 2 (S1502). id="p-322" id="p-322" id="p-322" id="p-322" id="p-322"

[0322] In the permission information configuration of the Remote UE function, the UE_B 9 may notify the ProSe application server_A 2 ofinformation including the ProSe Remote UE ID or the ProSe UE ID assigned by the ProSe function unit_A 7. id="p-323" id="p-323" id="p-323" id="p-323" id="p-323"

[0323] The ProSe application server_A 2, based on receiving the ProSe Remote UE ID or the ProSe UE ID, may assign the ProSe Application User ID to the user ID in the application layer.

Note that the ProSe Application User ID ed to the UE_A 8 by the ProSe application server_A 2 may be a cted ProSe Application User ID for restricted discovery.

The ProSe application server_"A 2 notifies the UE_B 9 of the ProSe Application User ID assigned to the UE_B 9.

Furthermore, in the permission configuration procedure, the UE_B 9 may obtain the ProSe Application User ID of UE on which the monitoring can be performed. cally, the ProSe Application User ID ofthe UE_A 8 may be obtained.

Note that the permission information configuration may be performed before the service tication procedure or may be performed after that.

Next, the UE_B 9 transmits a discovery request to the ProSe on unit_A 7 (S1504). The discovery request may be a discovery request message with which the UE_B 9 requests to start the monitoring ure. Here, the transmission ofthe discovery request by the UE_B 9 may be performed under the condition that the service authentication procedure has been completed.

More specifically, the transmission may be performed under the condition that the UE_B 9 has been ticated to perform cing by the ProSe function unit_A 7 of a Home PLMN which is a network operator to make a contract with. In addition, the transmission may be performed under the condition that the UE_B 9, in a case ofthe completion ofthe authentication, obtains the authentication information from the ProSe function unit_A 7 and stores the stated authentication ation.

The discovery request may include the ProSe Application User ID, UE ID, a d indicating the monitoring, a discovery type indicating that the discovery is aimed to achieve a UE-to—NW Relay service, and an Application Note that the ProSe Application User ID is information reported from the ProSe application server_A 2 in the permission configuration procedure.

UE ID is identification information of the UE_B 9, and may be, for example, IMSI. atively, UE ID may be the ME Identity. id="p-332" id="p-332" id="p-332" id="p-332" id="p-332"

[0332] The information indicating the request of monitoring may be requested, not only by an identifying method by the command, but also by transmitting a monitoring t message while defining the monitoring request message and the like. To be more specific, a message type requesting the monitoring is defined, and the t message including the message type may be transmitted.

The discovery type may be information indicating that the requested Discovery procedure is aimed to achieve the UE-to-NW Relay service and further indicating that it is the discovery made by announcing and monitoring (Model A).

Note that the command and/or the ery type may be capability information indicating that the UE_B 9 has a relay function for a proximity terminal device and the network. Alternatively, separate from the above—discussed information, the UE_B 9 may indicate the inclusion ofthe relay on for a proximity terminal device and the network.

Note that the UE_B 9 may transmit the discovery request including multiple combinations of discovery types and the Application IDs.

Specifically, the UE_B 9 may transmit the discovery request including a combination ofthe Application ID A and the discovery type of -NW Relay", and a combination of the Application ID B and "restricted discovery".

Furthermore, the ProSe function unit_A 7 as a transmission destination of the discovery t may store, in advance, information on the ProSe on unit_A 7 of a Home PLMN as a network operator with which the UE_B 9 makes a contract, and the ProSe function unit_A 7 ofthe Home PLMN may be set as the transmission destination.

The UE_B 9 may include APN in the discovery request. APN indicates the network to which the UE_A 8 requests access.

Furthermore, the UE_B 9 may include, in the discovery request, the ProSe ation User ID of UE on which the monitoring is requested to be med. For example, the UE_B 9 may indicate the intention of detecting the UE_A 8 by including, in the discovery request, the ProSe Application User ID of the UE_A 8. Note that, the UE_B 9 may include, in the discovery request, multiple ProSe Application User IDs.

The ProSe function unit_A 7 confirms whether the UE_B 9 is allowed to use a UE-to—NW Relay monitoring function, based on the Application ID or UE Furthermore, the ProSe function unitfiA 7 s whether the UE_B 9 has y been assigned a Relay Service Code and a timer. id="p-342" id="p-342" id="p-342" id="p-342" id="p-342"

[0342] The ProSe function unit_A 7 may transmit a discovery request to the application _A 2 based on a network policy or an operator policy.

In this case, the ProSe function unit_A 7 may transmit the ery request including the ProSe Application User ID ofthe UE__B 9 and the discovery type.

Note that, in a case where the ProSe Application User ID of UE on which the monitoring needs to be performed is ed in the received discovery request message, the ProSe function unit_A 7 may transmit, to the ProSe application server_A 2, the discovery request including the ProSe Application User ID ofthe UE on which the monitoring needed to be med.

The ProSe application server_A 2, based on receiving the discovery request from the ProSe function unit_A 7, confirms the permission information of the user identified by the ProSe Application User ID. id="p-346" id="p-346" id="p-346" id="p-346" id="p-346"

[0346] When the ProSe application server_A 2 confirms the permission information, the ProSe application server_A 2 may transmit a discovery response, as a response to the discovery request, to the ProSe function unit_A The discovery response may include the ProSe Application User ID that is allowed to use the e. Furthermore, the discovery response may include identification ation indicating that the service is allowed to be used. rmore, in a case where a list ofthe ProSe Application User IDs of UE which the UE_B 9 wants to r has been obtained, the ProSe application server_A 2 may transmit the discovery response including the ProSe Relay UE ID corresponding to the ProSe Application User ID.

The ProSe function unitwA 7 assigns a Relay Service Code and a timer to the UE_B 9, based on the discovery response from the ProSe application server_A 2 or the service permission by the ProSe function unit_A 7.

The Relay Service Code is identification information ponding to the UE—to-NW Relay service. Furthermore, the Relay Service Code may be temporary fication information which is assigned to the service by the ProSe function unit_A 7. In addition, the Relay Service Code may be the same as the value assigned to the UE_A 8.

The ProSe function unit_A 7 may assign a Relay Service Code based on the ProSe Relay UE ID ed from the ProSe application server_A 2.

Specifically, in a case where the ProSe Relay UE ID ofthe UE_A 8 is reported from the ProSe application server_A 2, the Relay Service Code ed to the UE_A 8 in a storage unit may be assigned to the UE_B 9 as well.

Furthermore, the timer is made to correspond to the Relay Service Code, and is a timer red to indicate a period of time during which the Relay Service Code is valid. That is, the announcing using the Relay Service Code is permitted until the counting ofthe timer is ended.

Furthermore, the ProSe function unit_A 7 may assign, to the UE_B 9, multiple ations of Relay Service Codes and timers.

Note that, in the case where the discovery type included in the discovery t is only "UE-to-NW Relay", the ProSe function unit_A 7 may further assign a ProSe Restricted Code (ProSe Restricted Code A) corresponding to the same Application ID to the UE_B 9 based on the operator policy or network . er, the ProSe function unit_A 7 may also assign a timer corresponding to the ProSe Restricted Code and indicating a period of time during which the ProSe Restricted Code is valid. [03 54] Note that a timer value corresponding to the ProSe Restricted Code and indicating a period oftime during which the ProSe Restricted Code is valid and a timer value ponding to the Relay Service Code and indicating a period oftime during which the Relay Service Code is valid may be different from each other or may be the same. A timer corresponding to the ProSe Restricted Code and indicating a period of time during which the ProSe Restricted Code is valid, may also be a timer corresponding to the Relay Service Code and ting a period oftime during which the Relay Service Code is valid. That is, the timer may be a timer corresponding to the ProSe Restricted Code and the Relay Service Code. [035 5] In the case where a combination of the Application ID A and the discovery type of "UE—to—NW Relay" and a combination ofthe Application ID B and "restricted discovery" are included in the ery request, the ProSe function unit_A 7 may further assign the ProSe Restricted Code (ProSe Restricted Code B) to the UE_B 9. Moreover, the ProSe on unit_A 7 may also assign a timer corresponding to the ProSe Restricted Code and indicating a period oftime during which the ProSe Restricted Code is valid. id="p-356" id="p-356" id="p-356" id="p-356" id="p-356"

[0356] The ProSe Restricted Code (ProSe Restricted Code B) assigned to the UE_B 9 by the ProSe function unit_A 7 in response to the discovery request from the UE_B 9 and the ProSe Restricted Code (ProSe Restricted Code A) Al 2016/069245 assigned to the UE_B 9 not based on the discovery request from the UE_B 9, may be the same or may be different from each other.

Furthermore, the timer value corresponding to the ProSe Restricted Code B and the timer value ponding to the ProSe Restricted Code A may be the same or may be different from each other. [035 8] Moreover, in a case where multiple ProSe Restricted Codes assigned to the UE_B 9 by the ProSe function unit_A 7 are the same, the timer values may also be the same.

Based on the service permission and the Relay Service Code configuration, the ProSe function unit_A 7 transmits a discovery se to the UE_B 9 (S1510). The discovery response may be a Response message to the discovery request. The discovery response may include a discovery filter.

The discovery filter may include the Relay e Code and a timer ponding to the Relay Service Code and indicating a period of time during which the Relay Service Code is valid. id="p-361" id="p-361" id="p-361" id="p-361" id="p-361"

[0361] In addition, in the case where the ProSe function unit_A 7 assigns the ProSe Restricted Code to the UE_B 9, the ProSe function unit_A 7 may add a combination ofthe ProSe Restricted Code and a timer corresponding to the ProSe Restricted Code to the discovery response and the ery filter. id="p-362" id="p-362" id="p-362" id="p-362" id="p-362"

[0362] In other words, the ProSe function unit_A 7 transmits, to the UE_B 9, the discovery filter including the Relay e Code "Cl" and the timer "Tl" corresponding to "Cl ". [03 63] Furthermore, the ProSe function unit_A 7 may transmit the discovery filter including the ProSe Restricted Code "Crl" corresponding to the same Application ID as the Application ID corresponding to the Relay Service Code "Cl" and the timer "Trl" corresponding to "Crl". Crl may be Cl, and furthermore Trl may be T1. In this case, it is sufficient for the ProSe function unit_A 7 to it the discovery filter including "Cl" and "T1 ". [03 64] Furthermore, the ProSe function unit_A 7 may transmit the discovery filter including the ProSe Restricted Code "Cr2" corresponding to a different Application ID from the Application ID corresponding to the Relay Service Code "C1" and the timer "Tr2" corresponding to "Cr2". [03 65] The timers "T1", "Trl", and "Tr2" may have the same value or may have different values. In the case where these timer values have the same value, it is sufficient for the ProSe on unit_A 7 to include "T1" in the discovery filter.

Combinations of these codes and timers may be included in mutually different discovery filters or ed in a single discovery filter. id="p-367" id="p-367" id="p-367" id="p-367" id="p-367"

[0367] In other words, the ProSe function unit_A 7 may transmit the discovery response including multiple discovery filters. [03 68] Next, the UE_B 9 es the discovery response. Furthermore, the UE_B 9 may obtain the ProSe Relay Service Code and a value of the timer.

In addition, the UE_A 8 may obtain, in a case of receiving the discovery the ProSe response, the ProSe Restricted Code and the timer corresponding to Restricted Code. id="p-370" id="p-370" id="p-370" id="p-370" id="p-370"

[0370] Furthermore, the UE_A 8 determines whether the monitoring is permitted based on the ation included in the discovery response.

In a case where the ring is permitted, radio ces are assigned (S1512) and the monitoring is performed on the announcing signal transmitted by the proximity terminal device using the obtained discovery filter. The radio resource information such as frequency and time may be obtained from the ProSe function unit_A 7, or the resources for the monitoring may be stored in e and then assigned. id="p-372" id="p-372" id="p-372" id="p-372" id="p-372"

[0372] The UE_B 9 may start counting ofthe timer based on receiving the discovery response. The UE_A 8 may perform the monitoring until the timer expires. The monitoring is stopped in a case that the timer is ended (the timer s) like a case in which the timer value becomes zero. Note that the Relay e Code may be included in a signal being monitored. Furthermore, the signal being monitored may include UE ID and/or the ProSe Relay UE ID.

Furthermore, the signal for the monitoring may include the information for identifying communication capability such as communication capacity of the PDN connection provided to the Remote UE by the proximity Relay UE.

In a case where the ProSe function unit_A 7 notifies the UE_B 9 that the authentication is essful in the discovery se, the UE_B 9 does not perform assigning ofthe radio resources or announcing.

Through the above-discussed procedure, the UE_B 9 can perform the authentication procedure for performing the monitoring. id="p-375" id="p-375" id="p-375" id="p-375" id="p-375"

[0375] Note that, in a case where the UE_B 9 is positioned outside the coverage, the UE_B 9 may perform the monitoring request procedure through another procedure.

For example, the UE_B 9 e the ge and the UE_A 8 inside the service in advance, coverage may store a freely-selected code for the monitoring the UE_A 8 may perform, based on the freely—selected code, the ring authentication in accordance with the service authentication and/or the permission configuration and/or the ery request ofthe UE_B 9. id="p-377" id="p-377" id="p-377" id="p-377" id="p-377"

[0377] A specific example in which the UE_B 9 e the ge transmits a monitoring request will be described below. The UE_B 9 outside the coverage has a Monitoring Service Code for the monitoring in e as discussed above, and the UE_B 9 broadcasts a discovery request including the Monitoring Service code.

The UE‘B 9 may include, in the discovery request, the ProSe Application User ID, UE ID, a command indicating the monitoring, a discovery type indicating that the discovery is aimed to achieve the UE —to—NW Relay service, and the Application ID. [03 79] The discovery type may be information indicating that the requested Discovery procedure is aimed to achieve the UE-to-NW Relay service and further indicating that it is the discovery made by announcing and monitoring (Model A). [03 80] In addition, the ery t may include identification information indicating a request to transfer the discovery request. Alternatively, in a case where the Monitoring Service Code is included in the discovery t, the UE_B 9 may request the transfer ofthe discovery request.

The UE_A 8 having received the discovery request transmitted by the UE_B 9 may transfer, to the ProSe function unit_A 7, the discovery request having received from the UE_B 9 based on the Monitoring Service Code included in the discovery request. Note that the UE__A 8, before the transfer of the discovery request, may perform e authentication on the ProSe function unit_A 7 and sion configuration on the ProSe application. id="p-382" id="p-382" id="p-382" id="p-382" id="p-382"

[0382] The ProSe function unit_A 7 confirms whether the UE_B 9 is allowed to use the UE—to—NW Relay monitoring function, based on the discovery request received from the UE_A 8, the ation ID, or UE ID having been ed. [03 83] Furthermore, the ProSe function unit_A 7 confirms whether the UE_B 9 has y been assigned a Relay Service Code and a timer. [03 84] The ProSe function unit_A 7 may transmit a discovery request to the application server_A 2 based on a network policy or an operator policy. [03 85] Because the discovery request procedure to the application server_A is similar to that discussed above, the description thereof is omitted herein. [03 86] The ProSe function unit_A 7 further s the Relay Service Code and a timer to the UE__B 9, based on the monitoring procedure authentication of the UE_B 9. Moreover, like in a case ofthe UE_B 9 being inside the coverage, the ProSe function unit_A 7 may assign the ProSe Restricted Code and a timer to the UE_B 9. [03 87] Because a method for assigning the Codes and timers is also similar to the method in the case of the UE_B 9 being inside the ge, the detailed ption thereof is omitted herein. [03 88] Based on the monitoring procedure authentication and the Relay Service Code assignment for the UE_B 9, the ProSe function unit_A 7 its a discovery response to the UE_B 9 via the UEflA 8.

The ProSe function unit_A 7 may transmit the ery response ing the discovery filter.

The discovery filter may include the Relay Service Code and a timer corresponding to the Relay Service Code and indicating a period oftime during which the Relay Service Code is valid.

As discussed above, the UE_B 9 may obtain the Relay e Code and the timer used for the monitoring by transmitting the discovery request even in the case of the UE_B 9 being outside the coverage. [03 92] 3 Procedure of Direct Communication Path Establishment and Relay Connection Establishment Hereinafter, described is a procedure in which, after the completion of the announcing t and monitoring request discussed in 1.3.2.1 and 1.3.2.2, Remote UE detects Relay UE, establishes a direct communication path of ProSe, and connects to the network using a relay.

The UE_B 9, when positioned e the coverage, detects proximity Relay UE using the monitoring. As such, the UE_B 9 stores one or multiple Relay e Codes in advance through the monitoring request procedure of 1.3.2.2 before performing the Discovery ure, and monitors the announcing signal transmitted from the proximity terminal.

The UE_B 9 monitors the announcing signal, itted by the UE_A 8, including the Relay Service Code. Furthermore, the UE_A 8 may transmit the announcing signal including the ProSe Relay UE ID, information on a user of the UE__A 8, or a state ofthe physical layer. [03 95] The state ofthe physical layer may refer to transmission speed, communication capacity, or the like which the UE_A 8 can provide to the Remote UE by the relay service.

Furthermore, the UE_A 8 may transmit the announcing signal including position information of the UE_A 8.

WO 02843 A1 In a case where the Relay Service Code stored in the UE_B 9 is the same as the Relay Service Code transmitted from the UE_A 8, the UE_B 9 can detect the UE_A 8.

At this time, the UE_B 9 may detect multiple pieces of Relay UE. In the case where the UE_B 9 detects the multiple pieces of Relay UE, the UE_B 9 ofthe timer may select the Relay UE in consideration of remaining time corresponding to the Relay Service Code, Relay UE capability, or Relay UE position information. id="p-399" id="p-399" id="p-399" id="p-399" id="p-399"

[0399] In a case where the UE_B 9 selects the UE_A 8 as Relay UE, or in a case where the cing signal is received only from the UE_A 8, the UE_B 9 establishes direct communication with the UE_A 8.

Specifically, the UE_B 9 transmits a direct—communication establishment t message to the UE_A 8. The UE_B 9 may transmit the direct-communication establishment t including the ProSe Relay UE ID of the UE_A 8.

The UE_A 8, in a case of receiving the request message from the UE_B 9, authenticates the UE_B 9 and establishes the direct communication connection.

The UE_B 9, after the establishment of the direct communication path with the UE_A 8, requests the UE_A 8 to assign an IP s. When the UE_B 9 requests IPv6, the UE_B 9 transmits a Router Solicitation message (RS signal) to the UE_A 8. The UE_A 8, in a case of receiving the RS signal, may configure, for the UE_B 9, an IP address to be assigned to the UE_B 9 from IPv6 prefix.

The UE_A 8 transmits a Router Advertisement message (RA signal) to the UE_B 9. The assigned IP s is included in the RA signal.

Alternatively, when the UE_B 9 requests the assignment of IPv4, the UE_B 9 transmits a DHCPV4 discover to the UE_A 8. The UE_A 8, based on receiving the detection message, selects an IP address from the pooled IP addresses and assigns the IP s to the UE_B 9. Furthermore, the UE_A 8 transmits a DHCPV4 offer message to the UE_B 9. The UE_A 8 includes the IP address assigned to the UE_B 9 in the DHCPV4 offer.

WO 02843 A1 The UE_B 9 having received the DHCP offer from the UE_A 8 transmits a DHSCP request including the ed IP address.

The UE_A 8 having received the DHCP request from the UE_B 9 replies DHCP Ack as a response.

As discussed above, the IP address of IPv6 or IPv4 is ed to the UE_B 9, and connection to the PDN connection is provided to the UE_B 9. id="p-408" id="p-408" id="p-408" id="p-408" id="p-408"

[0408] 1.3.3 Relay Service Code Update Procedure Next, a Relay Service Code update procedure will be described below.

The Relay Service Code needs to be regularly updated from the standpoint of security. id="p-409" id="p-409" id="p-409" id="p-409" id="p-409"

[0409] 1.3.3 1 Relay Service Code Update Procedure of Relay UE Hereinafter, an update procedure of the Relay Service Code stored in the UE_A 8 as Relay UE will be described.

The UE_A 8 can update the Relay Service Code in accordance with notification from the ProSe function unit_A 7, and continue the announcing.

In the following description, the UE_A 8 that has obtained a Relay e Code and a timer and has d counting ofthe timer for a tion service using the UE—to-NW Relay function, obtains a new ProSe Relay Service Code and a timer for the same connection service such as a connection service for an application identified by the same Application ID and makes the old Relay Service Code and timer invalid so as to use the new ProSe Relay Service code and timer. id="p-412" id="p-412" id="p-412" id="p-412" id="p-412"

[0412] An initial state of the present procedure may be a state in which the announcing request procedure discussed in 1.3.2.1 has been completed.

In other words, by the announcing request ure as discussed in 1.3.2.1, the UE_A 8 may be in a state in which the UE_A 8 has obtained "C1" as the Relay Service Code and "T1 " as the timer from the ProSe function unit_A 7.

A detailed description will be given below with reference to .

First, UE_A 8 starts counting of the timer "T1" based on the announcing request ure or the reception ofthe ery response, and makes the Relay Server Code "C1" valid (81606). In addition, the ProSe function unit_A 7 starts counting of a timer "Tl'" corresponding to the timer "T1" after the transmission ofthe discovery response, and makes the Relay Server Code "C1" valid (S 1607).

As discussed in the announcing procedure of 1.3.2.1, the UE_A 8 may transmit the announcing signal to perform the announcing during the counting of the timer "T1" being executed.

The UE_A 8 may request the Relay Service Code and a timer for the same relay connection service to the ProSe function unit_A 7 during the ng ofthe timer "T1" being executed. To rephrase, the UE_A 8 may newly request the Relay Service Code and timer to the ProSe function unit_A 7 before the timer "T1" expires.

The above re-request by the UE_A 8 may be performed when remaining time ofthe timer has become short. To be more specific, the UE_A 8 may store a threshold in advance, and may perform the re—request in the case where the remaining time ofthe timer becomes equal to the threshold or becomes shorter than the threshold. Furthermore, a trigger ofthe re-request is not limited o; the uest may be med under another condition, or may be med at a freely-selected timing.

The UE_A 8 may transmit a discovery request to the ProSe function unitfiA 7 in order to re-request the Relay Service Code and a timer for the same relay connection service (S1608). id="p-419" id="p-419" id="p-419" id="p-419" id="p-419"

[0419] The discovery request may be a discovery t message requesting the announcing. The discovery t message for the announcing may be the discovery request message transmitted by the UE_A 8 as discussed in the announcing request procedure of 1.3.2 (S1404). Because it is sufficient that the sing with regard to the transmission by the UE_A 8, the discovery t message configuration, information elements included in the discovery request detailed message, and the like are similar to those discussed above, the description thereof is omitted herein.

Note that, by including, in the discovery request, the same APN as APN having been included in the us discovery request, the UE_A 8 may indicate that the request message is a message for the same service.

Next, the ProSe function unit_A 7 receives the discovery request. rmore, the ProSe function unit_A 7 transmits a discovery response as a Response message to the UE_A 8 (S1610). The ProSe function unit_A 7 may transmit the Response message including the Relay Service Code and the timer. id="p-422" id="p-422" id="p-422" id="p-422" id="p-422"

[0422] This discovery se may be a discovery response message requesting the announcing as discussed in 1.3.2.1 ($1410).

Here, a condition where the discovery response is transmitted may be such that the response is transmitted based on receiving the discovery t, or is transmitted based on the tication. A specific method for the authentication may be performed using a method described in the announcing request procedure of 1.3.2. atively, the ProSe function unit_A 7 may update the ProSe Relay Service Code based on a network connection state or the operator policy without re—receiving the discovery request from the UE_A 8. The ProSe function unit_A 7 may notify the UE_A 8 of a notification message including the Relay Service Code d by the ProSe function unit_A 7. id="p-425" id="p-425" id="p-425" id="p-425" id="p-425"

[0425] The notification message, like the discovery response, includes a timer value corresponding to the updated Relay Service Code and indicating a period of time during which the Relay Service Code is valid.

Furthermore, the Relay Service Code and the timer included in the ery response or the notification message may include the old Relay Service Code "Cl" having already been assigned and the remaining time ofthe timer "Tl" corresponding to the old Relay Service Code "C1". atively, the Relay Service Code and the timer included in the discovery response or the notification message may include a new Relay e Code "C2" different from the Relay Service Code "Cl" and a timer "T2" ponding to the new Relay Service Code "C2".

Here, the old Relay Service Code "Cl" and the new Relay e Code "C2" may correspond to a single ation ID.

Whether to it the old Relay Service Code or transmit the new Relay Service Code may be determined based on the following conditions or processing.

In a case that the remaining time of the timer T1 is short, the ProSe on unit_A 7 may transmit the information ing the new Relay Service Code "C2" and the timer "T2". To be more specific, the ProSe function unit_A 7 may store a threshold in advance, and may transmit the information including the new Relay Service Code "C2" and timer "T2" in the case where the remaining time of the timer becomes equal to the threshold or becomes shorter than the threshold.

Meanwhile, in the case where the ing time of the timer T1 is long enough, the ProSe on unit_A 7 may transmit the information including the old Relay Service Code "Cl" and the remaining time of the timer "T1". To be more specific, the ProSe function unit_A 7 may store a threshold in advance, and may transmit the information including the new Relay Service Code "Cl" and the remaining time ofthe timer "T1 " in the case where the remaining time of the timer is longer than the threshold or is equal to the threshold.

Alternatively, the ProSe function unit_A 7 may determine the above in accordance with the received discovery request. The UE_A 8 may transmit the discovery request ing identification information, for example.

This identification information may be such identification information that indicates whether the UE_A 8 requests the old Relay Service Code or the new Relay Service Code.

The ProSe function unit_A 7 may transmit the information ing the new Relay Service Code "C2" and timer "T2" based on the identification information. Alternatively, the ProSe function unit_A 7 may transmit the information including the old Relay Service Code "Cl" and the remaining time of the timer "Tl" based on the identification information. rmore, the ProSe function unit_A 7 may determine the above based on the presence/absence of the identification information. That is, the identification information may be such fication information that indicates a t for a new Relay Service Code. For example, the UE_A 8 may transmit a discovery request without including identification information and request the old Relay Service Code. Alternatively, the UE_A 8 may transmit the discovery request including the identification information and t a new Relay Service Code.

Meanwhile, based on the fact that the identification information is not included in the discovery request, the ProSe function unit_A 7 may transmit the information including the old Relay Service Code "C1" and the remaining time of the timer "T1". The ProSe function unit_A 7 may it the information including the new Relay Service Code "C2" and the timer "T2" based on the fact that the identification information is included in the discovery request.

Alternatively, the identification information may be such identification ation that indicates a request for the old Relay Service Code. For example, the UE_A 8 may transmit the discovery request without including the identification information and request a new Relay Service Code. Alternatively, the UE_A 8 may transmit the discovery request including the identification information and request the old Relay Service Code. [043 8] The ProSe function unit_A 7 may transmit the information including the new Relay Service Code "C2" and the timer "T2" based on the fact that the identification information is not included in the discovery request. Meanwhile, based on the fact that the identification information is ed in the discovery request, the ProSe function unit_A 7 may transmit the information including the old Relay Service Code "Cl" and the remaining time of the timer "T1". id="p-439" id="p-439" id="p-439" id="p-439" id="p-439"

[0439] The above-mentioned identification information may be an information element such as a flag included in the discovery request, or may be an information element indicating a e type of control message.

As sed above, the ProSe function unit_A 7 may transmit the ation ing the remaining time ofthe timer "Tl " and may synchronize the timers of multiple pieces of UE.

This discovery request may be the discovery request requesting the announcing as discussed in 1.3.2. Accordingly, the above-mentioned identification information may be included in the discovery request requesting the cing as discussed in 1.3.2.

Whether the ProSe function unit__A 7 transmits the old Relay Service Code or the new Relay Service Code may also be determined based on the configuration of the ProSe function unit_A 7 or the like. For example, the configuration of the ProSe function unit_A 7 may be determined in accordance with a Mobile Operator Policy of a network operator running the ProSe function unit_A 7, or an application or policy, and then the ined configuration may be performed.

Note that the configuration may be ined while combining the conditions and sing having been discussed thus far, or may be determined based on other methods.

Next, the UE_A 8 receives the discovery response. Furthermore, the UE_A 8 obtains a Relay Service Code and a timer included in the discovery response.

When the UEflA 8 obtains the new Relay Service Code "C2", the UE_A 8 Code may stop using the old "Cl" and may start using the new Relay e "C2" (S1612). id="p-446" id="p-446" id="p-446" id="p-446" id="p-446"

[0446] Specifically, the UE_A 8 may perform an action in which the old Relay Service Code "Cl" is made invalid while the new Relay Service Code "C2" is made valid, for example.

Furthermore, the UE_A 8 may stop the counting of the timer "T1" corresponding to the old Relay Service Code "Cl" and may start the counting of the timer "T2" corresponding to the new Relay Service Code "C2".

In addition, the UE_A 8 may delete the old Relay e Code "C1" and the timer "T1" from the storage unit.

The UE_A 8 may stop transmitting the cing signal using the old Relay Service Code "C1", and may set such a configuration in which the announcing using the Relay Service Code "Cl" is not performed after the UE_A 8 has stopped the announcing using the old Code "C1".

Furthermore, the Pro Se function unit_uA 7, in a case of transmitting the discovery response, may stop counting of "Tl'" and start counting of "T2'" corresponding to the timer "T2" (S1614).

The UE_A 8 may transmit the announcing signal using the new Relay Service Code "C2" until the timer "T2" corresponding to the new Relay Service Code "C2" expires. rmore, the UE_A 8 may determine whether to perform the update procedure of the Relay Service Code, based on the ration of the UE_A 8 or the like. For example, the configuration of the UE_A 8 may be determined in accordance with a user policy, a Mobile Operator Policy of a network operator running the ProSe function unit_A 7, or an application operator policy, and then the determined configuration may be performed.

Note that the configuration may be ined while combining the conditions and processing having been discussed thus far, or may be determined based on other s.

In addition, in the case where the UE_A 8 does not perform the update procedure of the Relay Service Code, the UE_A 8 may continue the announcing using the old Relay Service Code. For example, when the UE_A 8, in a case of having received the se message, has obtained the old Relay Service Code "C1", the UE_A 8 may continue the announcing using the old Relay Service Code "C1" until the timer "Tl" being counted expires. Note that the UE_A 8 may update the timer value indicating the remaining time of the timer "Tl " to the received timer value, and continue the counting. [045 5] Alternatively, in the case where the UE_A 8 does not perform the update procedure of the Relay Service Code, the UE_A 8 may stop all the cing using the old Relay Service Code and the new Relay e Code. id="p-456" id="p-456" id="p-456" id="p-456" id="p-456"

[0456] Through the discussed procedure, the UE_A 8 can continue the announcing corresponding to the connection service by a relay.

Note that, in the procedure of assigning the old Relay Service Code "Cl and the timer "Tl", when the ProSe Restricted Code "Crl " and the timer "Trl" have been assigned to the same ation ID, the UE_A 8 may update the ProSe cted Code and the timer during the Relay Service Code update procedure. Alternatively, only the Relay Service Code and the timer may be updated. [045 8] 1.3.3.2 Relay Service Code Update Procedure of Remote UE A Relay Service Code update procedure of Remote UE will be described next. As illustrated in in the case where the Remote UE has already obtained the Relay Service Code, the Remote UE may be outside the coverage.

In a case ofthe update of the Relay e Code ofthe Relay UE, it is necessary that the Relay Service Code ofthe Remote UE can be updated. id="p-460" id="p-460" id="p-460" id="p-460" id="p-460"

[0460] Specifically, for example, when the UE_A 8 is providing a PDN connection service using a relay by ProSe direct communication to a ity terminal, the UE_A 8 may notify the proximity terminal of the update of the Relay Service Code using the ProSe direct communication, based on the Relay Service Code and the timer having been updated.

To be specific, in the case where the UE_A 8 obtains the new Relay Service Code and the timer during providing the PDN connection by rely to the UE_B 9, the UE_A 8 may update the Relay e Code and the timer, and notify the UE_B 9 of a notification message telling the update ofthe Relay Service Code over the ProSe direct communication.

The UE_A 8 may include, in the notification message, identification information for identifying that the notification message is a message telling the update ofthe Relay e Code.

Alternatively, the UE_A 8 may implicitly stop, upon receiving the new Relay Service Code, providing the PDN connection to the UE_B 9.

The UE_B 9 receives the notification message from the UE_A 8. In a case of receiving the notification message from the UE_A 8 or in a case of the PDN connection service being itly stopped, the UE_B 9 transmits a WO 02843 Al discovery request message in order to update the Relay Service Code and/or the timer.

Because the discovery request message transmitted from the UE_B 9 is similar to the ery request message discussed in 1.3.2.2, the detailed description thereof is omitted herein.

Like in the description of 1.3.2.2, when the UE_B 9 is present outside the coverage, the UE_A 8 as Relay UE may transfer the discovery request to the ProSe function unit__A 7.

The ProSe function unit_A 7 may assign, to the UE_B 9, a new Relay e Code and a timer based on receiving the discovery request.

Furthermore, the ProSe function unit_A 7 may transmit a discovery response to the UE_B 9 via the UE_A 8.

The ery response message may include a discovery filter. The discovery filter included in the discovery response message may include a new Relay Service Code and a new timer.

In a case that the UE_B 9 obtains the new discovery filter or the new Relay Service Code and the new timer, the UE_B 9 may stop the timer corresponding to the old Relay e Code and update the Relay Service Code and the timer.

In the manner discussed above, the Relay Service Code update procedure of Remote UE may be performed. To rephrase, in a case of receiving the notification from the Relay UE and in a case ofthe provision ofthe service being stopped, the Remote UE may obtain, by re-requesting a new Relay Service Code to the ProSe function unit, the new Relay Service Code and timer, and may update the Code. 1.3.4 Modification on Relay Service Code Update Procedure Although, in 1.3.3, an e of the ure in which the UE_A 8 updates the Relay e Code is described, a specific procedure is not limited to the t embodiment; it is to be noted that design, combinations, and the like within a scope that does not depart from the spirit of the present invention are also included in the t invention.

Although, in the Relay Service Code update ure of 1.3.3, an e is described in which the UE_A 8, in a case of receiving the discovery response, stops the announcing using the old ProSe Relay Service Code, monitoring may be continued.

To be c, the identification information indicating a request for the Relay Service Code update procedure and included in the discovery response by the ProSe function unit_A 7, may be identification information requesting to continue the monitoring using the old Relay Service Code. At this time, the UE_A 8 may continue, in addition to the processing discussed in 1.3.3, the monitoring using the old Relay Service Code "C1" based on the identification information ed in the discovery response until the timer "T1" corresponding to the old Relay Service Code "Cl" expires.

The procedure in which the Remote UE obtains and updates the Relay Service Code for detecting the Relay UE using the Model A detection has been described thus far. er, the procedure in which the Remote UE, based on the detection, establishes a direct connection with the Relay UE and then establishes a PDN connection has also been described. id="p-477" id="p-477" id="p-477" id="p-477" id="p-477"

[0477] 2. Second Embodiment In the first embodiment, the procedure in which Relay UE transmits an announcing signal and Remote UE performs monitoring so that the Remote UE obtains and s a Relay Service Code for detecting the proximity Relay UE (Model A) is described. Meanwhile, in the present embodiment, a method in which Relay UE monitors an cing signal transmitted from Remote UE and replies a Response message so that the Remote UE obtains and updates the Relay Service Code for detecting the proximity Relay UE (Model B) will be described. [047 8] Hereinafter, a radio communication technology according to an embodiment of the present invention will be described in detail with reference to the drawings. 2.1 Overview of Communication System Because it is sufficient that the overview and device configurations of the communication system are the same as those ofthe communication system discussed in 1.1 and 1.2, the detailed description thereof will be omitted. 2.2 Description of Processing Hereinafter, the overview of processing described in the present embodiment will be described. id="p-481" id="p-481" id="p-481" id="p-481" id="p-481"

[0481] 2.2.1 Service Authentication Procedure Each of the UE__A 8 and the UE_B 9 performs an authentication procedure for proximity terminal detection (ProSe Direct ery) provided as a ProSe service, and communication using a direct communication path (ProSe Direct Communication).

Furthermore, the UE_A 8 performs an authentication procedure for usage ofthe ProSe Relay UE function as a ProSe service, and the UE_B 9 performs an authentication procedure for usage of the Remote UE function. id="p-483" id="p-483" id="p-483" id="p-483" id="p-483"

[0483] The proximity al detection and the communication using a direct communication path may each be authenticated by different procedures, or may be authenticated by a single tication ure. Because the service authentication procedures are the same as those ofthe first embodiment, the detailed ption thereof will be omitted. 2.2.2 Discovery t Procedure An authentication procedure in which respective pieces of UE (Relay UE and Remote UE) start a Discovery procedure by Solicitation and se will be described next.

The respective pieces of UE may start the following procedure on the assumption that the stated pieces of UE have succeeded in obtaining service authentication in an attach procedure. id="p-486" id="p-486" id="p-486" id="p-486" id="p-486"

[0486] Alternatively, when the Remote UE is present outside the coverage, a discovery request procedure may be started even in a case where the Remote UE is not service-authenticated. 2.2.2.1 Discovery Request Procedure of Relay UE First, a procedure in which the UE_A 8 monitors Solicitation to be received from the UE_B 9 and requests to transmit a Response message for the Solicitation will be described.

Hereinafter, a discovery request procedure in which the UE_A 8 performs monitoring and transmits a se message will be described based on . id="p-489" id="p-489" id="p-489" id="p-489" id="p-489"

[0489] The UE_A 8 configures permission ation ofthe Relay UE function with the ProSe application server_A 2 (S1702). Note that the permission information configuration may be performed before the service authentication procedure or may be performed after that. id="p-490" id="p-490" id="p-490" id="p-490" id="p-490"

[0490] In the permission information configuration ofthe Relay UE function, the UE_A 8 notifies the ProSe application server of information including the ProSe Relay UE ID ed by the ProSe on unit.

The ProSe application server_A 8, based on receiving the ProSe Relay UE ID, assigns the ProSe Application User ID to the user ID in the application layer.

The ProSe ation User ID assigned to the UE_A 8 by the ProSe application server_A 2 may be a Restricted ProSe Application User ID for cted discovery.

The restricted discovery refers to a procedure in which proximity al detection is med with definite permission from UE to be detected.

The ProSe application server_A 2 notifies the UE_A 8 of the ProSe Application User ID assigned to the UE_A 8.

The UE_A 8 obtains the ProSe Application User ID from the ProSe application server_A 2.

Next, the UE_A 8 transmits a ery request to the ProSe function unit_A 7 (S1704). The discovery request may be a discovery request message with which the UE_A 8 requests to perform monitoring and start a transmission procedure of a Response message based on the monitoring. Here, the transmission of the ery request by the UE_A 8 may be performed under the condition that the service authentication procedure has been completed.

More specifically, the transmission may be med under the condition that the UE_A 8 has been authenticated to perform monitoring by the ProSe function unit_A 7 of a Home PLMN which is a network operator to make a contract with.

In addition, the transmission may be performed under the condition that the UE_A 8, in a case of the completion of the authentication, obtains the authentication information from the ProSe function unit_A 7 and stores the stated authentication information.

The discovery t may e the ProSe Application User ID, UE ID, a command indicating the monitoring and the Response message ission (e.g. "monitoring + Response"), a discovery type indicating that the ery is aimed to achieve a UE-to—NW Relay service, and an Application ID. id="p-498" id="p-498" id="p-498" id="p-498" id="p-498"

[0498] Note that the ProSe Application User ID is information reported from the ProSe application server_A 2 in the permission ration procedure.

UE ID is identification information of the UE_A 8, and may be, for e, IMSI. atively, UE ID may be the ME Identity.

The information indicating the request for the monitoring and the Response message transmission may be requested, not only by an identifying method by the command, but also by transmitting a monitoring request message while defining the monitoring request message or the like. To be more specific, a e type requesting the monitoring is defined, and the request message including the message type may be transmitted.

The discovery type may be information indicating that the requested Discovery ure is aimed to achieve the UE-to-NW Relay service and also indicating that it is the discovery by a Solicitation message and a Response message (Model B).

Al 2016/069245 The command and/or the discovery type may be capability ation indicating that the UE_A 8 has a relay on for a proximity terminal device and the network. atively, separate from the above-discussed information, the UE_A 8 may indicate the ion of the relay function for a proximity terminal device and the network.

The UE_A 8 may transmit the discovery request including multiple combinations of discovery types and Application IDs. [05 04] Specifically, the UE_A 8 may transmit the discovery t including a ation of an Application ID A and a discovery type of "UE -to-NW Relay", and a combination of an Application ID B and "restricted discovery".

Furthermore, the ProSe function unit_A 7 as a transmission destination of the discovery request may store, in advance, information on the ProSe function unit_A 7 of a Home PLMN as a k operator with which the UE_A 8 makes a contract, and the ProSe function unit_A 7 ofthe Home PLMN may be set as the transmission destination. [05 06] The UE_A 8 may include APN in the discovery request. APN indicates the k to which the UE_A 8 requests access.

The ProSe function unitfiA 7 confirms r the UE_A 8 is allowed to use a UE-to—NW Relay monitoring function and a Response message transmission function, based on the Application ID or UE ID.

Furthermore, the ProSe function unit_A 7 confirms whether the UE_A 8 has already been assigned a Relay e Code and a timer.

The ProSe function unit_A 7 may transmit a discovery request to the application server_A 2 based on a network policy or an operator policy.

In this case, the ProSe function unit_A 7 may transmit the discovery request including the ProSe Application User ID and the discovery type. id="p-511" id="p-511" id="p-511" id="p-511" id="p-511"

[0511] The ProSe application server_A 2, based on receiving the discovery request from the ProSe function unit_A 7, confirms the permission information of the user identified by the ProSe Application User ID.

WO 02843 A1 When the ProSe application server_A 2 confirms the permission information, the ProSe application server_A 2 may transmit a discovery function unit_A 7. se, as a response to the discovery request, to the ProSe The discovery response may include the ProSe Application User ID that is allowed to use the service. Furthermore, the discovery response may include identification information indicating that the e is allowed to be used.

The ProSe function unit_A 7 assigns a Relay Service Code and a timer to the UE_A 8, based on the discovery response from the ProSe application server_A 2 or the service permission by the ProSe function unit_A 7.

The Relay Service Code is identification information corresponding to the UE-to—NW Relay e. Furthermore, the Relay Service Code may be temporary identification information which is assigned to the service by the ProSe function unit_A 7.

Furthermore, the timer is made to pond to the Relay Service Code, and is a timer configured to indicate a period of time during which the Relay Service Code is valid. That is, the announcing using the Relay Service Code is permitted until the counting ofthe timer is ended.

Note that, in a case where the discovery type included in the discovery request is only "UE—to—NW , the ProSe function unit_A 7 may further assign a ProSe Restricted Code (ProSe Restricted Code A) corresponding to the same Application ID to the UE_A 8 based on the or policy or network policy. Moreover, the ProSe function unit_A 7 may also assign a timer corresponding to the ProSe Restricted Code and indicating a period of time during which the ProSe Restricted Code is valid. id="p-517" id="p-517" id="p-517" id="p-517" id="p-517"

[0517] The ProSe Restricted Code is a code used by the ProSe function unit for a ProSe restricted Discovery service, and may pond to one or multiple ProSe Application User IDs.

The ProSe Restricted Discovery e is a procedure of ion performed by a terminal device based on explicit permission from the detected terminal device. For example, the service is such that UE configured to perform the detection obtains the ProSe Restricted Code from proximity UE to be detected so as to confirm the explicit detection permission, and receives the announcing including the ProSe Restriction Code, thereby detecting the proximity UE.

A timer value ponding to the ProSe Restricted Code and ting a period of time during which the ProSe Restricted Code is valid and a timer value corresponding to the Relay Service Code and indicating a period oftime during which the Relay Service Code is valid may be ent from each other or may be the same. id="p-520" id="p-520" id="p-520" id="p-520" id="p-520"

[0520] In a case where a combination ofthe Application ID A and the discovery type of "UE-to-NW Relay" and a combination ofthe Application ID B and "restricted discovery" are included in the discovery request, the ProSe function unit_A 7 may further assign the ProSe Restricted Code (ProSe Restricted Code B) to the UE_A 8. Moreover, the ProSe function unit_A 7 may also assign a timer ponding to the ProSe Restricted Code and indicating a period of time during which the ProSe Restricted Code is valid.

The ProSe Restricted Code (ProSe Restricted Code B) assigned to the UE_A by the ProSe function unit_A 7 in response to the discovery request from the UE_A 8 and the ProSe cted Code (ProSe Restricted Code A) assigned to the UE_A not based on the discovery request from the UE_A 8, may be the same or may be different from each other.

Furthermore, the timer corresponding to the ProSe Restricted Code B and the timer ponding to the ProSe Restricted Code A may be the same or may be different from each other.

Based on the service permission and the Relay Service Code configuration, the ProSe function unit_A 7 transmits a discovery se to the UE_A 8 (81710). The discovery response may be a Response message to the discovery request having been received from the UE_A 8.

The discovery se may include a discovery filter. A Relay Service Code and a timer corresponding to the Code may be included in the discovery filter.

In the case where the ProSe function unit_A 7 assigns the ProSe Restricted Code to the UE_A 8, the ProSe function unit_A 7 may transmit the discovery response further including the discovery filter encompassing the ProSe Restricted Code and a timer ponding to the ProSe Restricted Code.

In other words, the ProSe function unit_A 7 transmits, to the UE_A 8, the discovery response including the discovery filter encompassing the Relay Service Code "C1" and the timer "Tl " corresponding to "C1".

Furthermore, the ProSe function unit_A 7 may transmit the discovery the ProSe Restricted Code response including the ery filter encompassing "Crl " ponding to the same Application ID as the Application ID corresponding to the Relay Service Code "Cl" and the timer "Trl" corresponding to "Crl ". id="p-528" id="p-528" id="p-528" id="p-528" id="p-528"

[0528] Furthermore, the ProSe function unit_A 7 may transmit the discovery the ProSe Restricted Code response ing the discovery filter assing "Cr2" corresponding to a different ation ID from the Application ID corresponding to the Relay Service Code "Cl" and the timer "Tr2" corresponding to "Cr2".

The timers "Tl", "Trl", and "Tr2" may have the same value or may have different values.

In addition, some of "C1", "Crl", and "Cr2" may be the same information; in a case Where this is the case, the timers corresponding to the Codes may also be the same. Specifically, in a case that "Crl" equals "Cl", "Trl" may be "T1"; in this case, it is sufficient that the discovery filter encompassing "Tl " and "Cl" is included in the discovery response. id="p-531" id="p-531" id="p-531" id="p-531" id="p-531"

[0531] Next, the UE_A 8 receives the ery response. Furthermore, the UE_A 8 may obtain the ProSe Relay Service Code and a value of the timer.

In addition, the UE_A 8 may obtain, in a case of receiving the discovery Restricted Code and the response or receiving the discovery filter, the ProSe timer ponding to the ProSe Restricted Code.

Furthermore, the UE_A 8 ines r the monitoring and the Response message ission are permitted based on the information included in the discovery response.

In a case where the monitoring and the Response message transmission are permitted, the UE_A 8 may assign radio resources ) and transmit a signal including the obtained Relay Service Code to its proximity. The radio ce information such as frequency and time may be obtained from the ProSe function unit_A 7, or the resources for the monitoring and the Response message may be stored in e and then assigned.

In addition, the UE_A 8 may start counting of the timer based on receiving the ery response. The UE_A 8 may monitor the Solicitation message until the timer expires. The monitoring is stopped in a case that the timer is ended (the timer expires) like a case in which the timer value becomes zero. The Relay Service Code may be included in the Solicitation message received by monitoring. Furthermore, the signal being monitored may include UE ID and/or the ProSe Remote UE ID or the ProSe UE ID.

In a case where the UE_A 8 is notified that the authentication is unsuccessful in the discovery response, the UE_A 8 does not perform assigning of the radio resources or announcing. h the above—discussed procedure, the UE_A 8 can perform the authentication procedure for the monitoring and the Response message transmission. 2.2.2.2 Discovery Request Procedure of Remote UE Next, a procedure in which the UE_B 9 requests to detect a proximity terminal by transmitting a Solicitation message will be described next.

In a case where the UE_B 9 has connectivity to a base n, the UE_B 9 may beforehand perform a discovery request procedure described below, and from a may obtain authentication for the transmission ofa Solicitation message server device.

Hereinafter, a Discovery procedure in which the UE_B 9 transmits a Solicitation message will be described based on .

The UE_B 9 configures permission information ofthe Remote UE function with the ProSe application server_A 2 (81802).

In the permission information configuration of the Remote UE function, the UE_B 9 notifies the ProSe application server ofinformation including the ProSe Remote UE ID or the ProSe UE ID assigned by the ProSe function unit.

The ProSe application server_A 8, based on receiving the ProSe Remote UE ID or the ProSe UE ID, assigns the ProSe Application User ID to the user ID in the application layer.

The ProSe Application User ID assigned to the UE_B 9 by the ProSe application server_A 2 may be a Restricted ProSe Application User ID for restricted discovery.

The ProSe application server_A 2 s the UE_B 9 of the ProSe Application User ID assigned to the UE_B 9. The sion information configuration may be performed before the service authentication procedure or may be med after that.

Next, the UE_B 9 transmits a discovery request to the ProSe function unit_A 7 ($1804). The discovery t may be a discovery request message with which the UE_B 9 requests to start an announcing procedure of the Solicitation message. Here, the transmission ofthe discovery request by the UE_B 9 may be performed under the condition that the service authentication ure has been completed. More cally, the transmission may be performed under the condition that the UE_B 9 has been authenticated to perform announcing by the ProSe function unit_A 7 of a Home PLMN which is a network operator to make a contract with. In addition, the transmission may be performed under the condition that the UE_B 9, in a case ofthe completion of the authentication, obtains the authentication information from the ProSe function unit_A 7 and stores the stated tication information.

The discovery request may include the ProSe Application User ID, UE ID, a command indicating a request to transmit the tation e or perform the announcing (e.g. itation" or "announcing"), a discovery type indicating that the discovery is aimed to achieve the UE-to—NW Relay service, and an Application ID.

Note that the ProSe Application User ID is information reported from the ProSe application server_A 2 in the permission configuration procedure.

UE ID is identification ation ofthe UE_B 9, and may be, for example, IMSI. Alternatively, UE ID may be the ME Identity. [05 50] The information indicating the request to transmit the Solicitation message may be requested, not only by an identifying method by the command, but also by transmitting a request message while defining the request message of the Solicitation procedure or the like. To be more specific, a message type requesting the tation procedure may be defined, and the request message including the message type may be transmitted.

The discovery type may be information indicating that the requested Discovery procedure is aimed to achieve the UE-to-NW Relay e and also ting that it is the discovery by a Solicitation message and a Response e (Model B).

Note that the command and/or the discovery type may be capability information indicating that the UE_B 9 has a relay function for a ity terminal device and the network. Alternatively, te from the above-discussed information, the UE_B 9 may indicate the inclusion of the relay on for a ity terminal device and the network.

The UE_B 9 may transmit the discovery request including multiple combinations of discovery types and the Application IDs. [05 54] Specifically, the UE_B 9 may transmit the discovery request including a combination ofthe Application ID A and the discovery type of "UE-to—NW Relay", and a combination ofthe Application ID B and "restricted discovery".

Furthermore, the ProSe function unit_A 7 as a transmission destination ofthe discovery request may store, in advance, ation on the ProSe function unit_A 7 of a Home PLMN as a network operator with which the UE_B 9 makes a contract, and the ProSe function unit_A 7 ofthe Home PLMN may be set as the transmission destination.

The UE_B 9 may include APN in the discovery t. APN indicates the network to which the UE_A 8 requests access.

The ProSe function unit_A 7 confirms whether the UE_B 9 is allowed to transmit a tation message for the UE—to-NW Relay and use a Response message reception function, based on the Application ID or UE id="p-558" id="p-558" id="p-558" id="p-558" id="p-558"

[0558] rmore, the ProSe on unit_A 7 confirms whether the UE_B 9 has already been assigned a Relay Service Code and a timer.

The ProSe function unit_A 7 may transmit a discovery request to the application server_A 2 based on a network policy or an operator policy.

In this case, the ProSe function unit_A 7 may transmit the discovery request including the ProSe Application User ID ofthe UE_B 9 and the discovery type. [05 61] The ProSe ation server_A 2, based on receiving the discovery request from the ProSe function unit_A 7, confirms the permission information ofthe user identified by the ProSe ation User ID.

When the ProSe application server_A 2 s the permission information, the ProSe application server_A 2 may transmit a discovery the ProSe on unit_A 7. response, as a response to the discovery request, to The discovery response may include the ProSe Application User ID that is allowed to use the service. Furthermore, the discovery se may include fication information indicating that the service is allowed to be used.

The ProSe function unit_A 7 assigns a Relay Service Code and a timer to the UE_B 9, based on the discovery response from the ProSe application server_A 2 or the service sion by the ProSe function unit_A 7. [05 64] The Relay Service Code is identification information corresponding to the UE-to—NW Relay service. Furthermore, the Relay Service Code may be temporary identification information which is assigned to the service by the ProSe function unit_A 7. In addition, the Relay Service Code may be the same as the value assigned to the UE_A 8.

The ProSe function unit_A 7 may assign a Relay e Code based on the ProSe Relay UE ID reported from the ProSe application server_A 2.

Specifically, in a case where the ProSe Relay UE ID of the UE_A 8 is ed from the ProSe application _A 2, the Relay Service Code assigned to the UE_A 8 in a storage unit may be assigned to the UEflB 9 as well. [05 66] Furthermore, the timer is made to correspond to the Relay Service Code, and is a timer configured to indicate a period of time during which the Relay Service Code is valid. That is, the announcing using the Relay Service Code is ted until the counting ofthe timer is ended.

Furthermore, the ProSe function unit_A 7 may assign, to the UE_B 9, multiple combinations of Relay Service Codes and timers.

Note that, in the case where the discovery type included in the discovery t is only "UE-to-NW Relay", the ProSe on unit_A 7 may further assign a ProSe Restricted Code (ProSe Restricted Code A) corresponding to the same Application ID to the UE_B 9 based on the operator policy or network policy. Moreover, the ProSe function unit_A 7 may also assign a timer corresponding to the ProSe Restricted Code and indicating a period of time during which the ProSe Restricted Code is valid. [05 69] A timer value corresponding to the ProSe Restricted Code and indicating a period of time during which the ProSe Restricted Code is valid and a timer value corresponding to the Relay Service Code and indicating a period oftime during which the Relay Service Code is valid may be different from each other or may be the same. A timer corresponding to the ProSe Restricted Code and indicating a period oftime during which the ProSe Restricted Code is valid, and indicating a period may be a timer corresponding to the Relay Service Code of time during which the Relay Service Code is valid. That is, the timer may be a timer ponding to the ProSe Restricted Code and the Relay Service Code. id="p-570" id="p-570" id="p-570" id="p-570" id="p-570"

[0570] In the case where a combination of the Application ID A and the discovery type of "UE-to-NW Relay" and a combination ofthe Application ID B and "restricted discovery" are included in the discovery request, the ProSe function unit_A 7 may further assign the ProSe Restricted Code (ProSe Restricted Code B) to the UE_B 9. Moreover, the ProSe function unit_A 7 may also assign a timer corresponding to the ProSe Restricted Code and indicating a period of time during which the ProSe Restricted Code is valid.

The ProSe cted Code (ProSe Restricted Code B) assigned to the UE_B 9 by the ProSe function unit_A 7 in response to the ery request from the UE_B 9 and the Pro Se cted Code (ProSe Restricted Code A) assigned to the UE_B 9 not based on the discovery request from the UE_B 9, may be the same or may be different from each other. rmore, the timer value corresponding to the ProSe Restricted Code B and the timer value corresponding to the ProSe Restricted Code A may be the same or may be different from each other. [05 73] Moreover, in a case where multiple ProSe Restricted Codes assigned to the UE_B 9 by the ProSe function unit_A 7 are the same, the timers may also be the same.

Based on the service permission and the Relay Service Code configuration, the ProSe function unit_A 7 transmits a discovery se to the UE_B 9 ($1810). The discovery response may be a Response message to the discovery request having been received from the UE_B 9.

The discovery response may include the Relay Service Code and a timer corresponding to the Relay Service Code and indicating a period of time during which the Relay Service Code is valid.

In addition, in the case where the ProSe function unit_A 7 assigns the ProSe Restricted Code to the UE_B 9, the ProSe function unit_A 7 may add a combination ofthe ProSe Restricted Code and a timer ponding to the ProSe Restricted Code to the discovery response.

In other words, the ProSe function unit_A 7 transmits, to the UE_B 9, the Relay e Code "C1" and the timer "T1" corresponding to "C1".

Furthermore, the ProSe on unit_A 7 may transmit the ProSe Restricted Code "Crl" corresponding to the same Application ID as the Application ID corresponding to the Relay Service Code "Cl" and the timer "Trl" ponding to "Crl". Crl may be Cl, and furthermore Trl may be Tl.

In this case, it is sufficient for the ProSe function unit_A 7 to transmit "Cl" and "T1". [05 79] Furthermore, the ProSe function unit_A 7 may transmit the ProSe Restricted Code "Cr2" corresponding to a different Application ID from the Application ID corresponding to the Relay Service Code "Cl" and the timer "Tr2" corresponding to "Cr2". [05 80] The timers "Tl", "Trl", and "Tr2" may have the same value or may have different values. In the case where these timers have the same value, it is sufficient for the ProSe function unit_A 7 to transmit "Tl ".

Combinations ofthese Codes and timers may be included in the same discovery response message, or included in each different discovery response for each ation. [05 82] In other words, the ProSe function unit_A 7 may transmit the discovery connection services and response ing multiple combinations of ProSe timers. [05 83] Next, the UE_B 9 receives the discovery response. Furthermore, the UE_B 9 may obtain the ProSe Relay Service Code and a value ofthe timer. [05 84] In addition, the UE_A 8 may obtain, in a case of receiving the ery to the ProSe response, the ProSe Restricted Code and the timer corresponding Restricted Code.

Furthermore, the UE_A 8 determines whether the Discovery procedure by the tation e transmission is permitted, based on the information included in the discovery response. [05 86] In a case where the Discovery procedure by the Solicitation message transmission is permitted, radio resources are assigned (S1812) and the tation e is ast toward a proximity terminal using the obtained Relay Service Code. The radio resource information such as frequency Al 2016/069245 and time may be obtained from the ProSe function unit_A 7, or the resources to be transmitted may be stored in advance and then assigned. [05 87] The UE_B 9 may start counting of the timer based on receiving the discovery response. The UE_A 8 may ast the Solicitation message at an appropriate timing before the timer expires. The broadcast is stopped in a case that the timer is ended (the timer expires) like a case in which the timer value becomes zero. The Relay Service Code may be included in the Solicitation message transmitted by the UE_B 9. Furthermore, the Solicitation message may include UE ID and/or the ProSe Remote UE ID or the ProSe UE ID. [05 88] In a case where the ProSe function unit_A 7 notifies the UE_B 9 that the authentication is unsuccessful in the discovery response, the UE_B 9 does not perform assigning of the radio resources or announcing. [05 89] Through the above-discussed procedure, the UE_B 9 can perform the authentication procedure for the Discovery procedure by the Solicitation message ission.

In a case where the UE_B 9 is positioned outside the coverage, the UE_B 9 may m the discovery request procedure through another procedure.

For example, in a situation in which the UE_B 9 outside the coverage and the UE_A 8 inside the ge store a freely-selected code for the discovery in advance, the UE_A 8 may perform, based on the freely-selected code, the service authentication of the UE_B 9 and/or the permission configuration and/or the Solicitation e transmission authentication in accordance with the ery t.

A specific example will be given below. The UE_B 9 outside the coverage has a ery Service Code for the monitoring in advance as discussed above, and the UE_B 9 broadcasts a discovery request including the ery Service Code.

The UE_B 9 may include, in the discovery request, the ProSe Application User ID, UE ID, a command ting the request for the Discovery procedure by the Solicitation message transmission, a discovery type ting that the discovery is aimed to achieve the UE —to-NW Relay service, and the Application ID.

In addition, the discovery request may include identification information ting a request to er the discovery request. Alternatively, the UE_B 9 Service Code may request the transfer ofthe discovery request by the Discovery being ed.

The UE_A 8 having ed the discovery t transmitted by the UE_B 9 may transfer, to the ProSe function unit_A 7, the discovery request having received from the UE_B 9 based on the Discovery Service Code included in the discovery request. Note that the UE_A 8, before the transfer of the discovery request, may perform service authentication on the ProSe function unit_A 7 and permission configuration on the ProSe application. id="p-596" id="p-596" id="p-596" id="p-596" id="p-596"

[0596] The ProSe function unitHA 7 confirms whether the UE_B 9 is allowed to transmit a Solicitation message for the UE-to-NW Relay and use the Response message reception function, based on the discovery request received from UE_A 8, or based on the Application ID or UE ID having been obtained. id="p-597" id="p-597" id="p-597" id="p-597" id="p-597"

[0597] Furthermore, the ProSe function unit_A 7 confirms whether the UE_B 9 has already been assigned a Relay e Code and a timer.

The ProSe function unit_A 7 may transmit a discovery request to the application server_A 2 based on a network policy or an or policy.

Because the discovery request procedure to the application server_A is similar to that discussed above, the description thereof is omitted .

The ProSe function unit_A 7 r assigns the Relay Service Code and a timer to the UE_B 9, based on the monitoring procedure authentication of the UE_B 9. Moreover, like in a case ofthe UE_B 9 being inside the coverage, the ProSe function unit_A 7 may assign the ProSe Restricted Code and a timer to the UE_B 9. id="p-601" id="p-601" id="p-601" id="p-601" id="p-601"

[0601] Because a method for assigning the Codes and timers is also r to the method in the case ofthe UE_B 9 being inside the coverage, the detailed description thereof is omitted herein.

Based on the Discovery procedure authentication by the Solicitation for the UE_B 9, message transmission and the Relay Service Code assignment the ProSe function unit_A 7 transmits a discovery response to the UE_B 9 via the UE_A 8.

The ProSe function unit_A 7 may transmit the discovery response including the Relay Service Code and a timer corresponding to the Relay Service Code and ting a period oftime during which the Relay Service Code is valid.

As discussed above, the UE_B 9 may obtain the Relay Service Code and the timer used for transmitting the Solicitation message, even in the case ofthe UE_B 9 being outside the coverage, by itting the discovery t. id="p-605" id="p-605" id="p-605" id="p-605" id="p-605"

[0605] 2.2.2.3 Procedure of Direct Communication Path Establishment and Relay Connection Establishment Hereinafter, described is a procedure in which, after the completion of the discovery request procedure discussed in 2.2.2.1 and 2.2.2.2, Remote UE detects Relay UE, establishes a direct communication path of ProSe, and connects with the k using a relay.

The UE_B 9 in which the discovery ure by the Solicitation message transmission is authenticated broadcasts a Solicitation message so as detect a proximity terminal.

The stated tation message may include at least the Relay Service Code, and the ProSe Remote UE ID or the ProSe UE ID obtained from the ProSe function unit_A 7. 3O [0608] Furthermore, the Solicitation e may include user information on the UE_B 9 user or information ting QoS required by UE. The user information may be, for example, information of a group to which the user id="p-609" id="p-609" id="p-609" id="p-609" id="p-609"

[0609] The UE_A 8 that is authenticated to receive the Solicitation message and use the Response message transmission function receives the Solicitation message announced from the UE_B 9. To rephrase, the UE_A 8 monitors an announcing signal from the UE_B 9.

The UE_A 8, based on receiving the Solicitation message, considers that the UE_A 8 ons as Relay UE for the UE_VB 9.

The UE_A 8 may determine whether to permit the UE_A 8 itself to function as Relay UE based on the information on the user included in the Solicitation message or based on the QoS. id="p-612" id="p-612" id="p-612" id="p-612" id="p-612"

[0612] In a case Where the UE_A 8 permits the UE_A 8 itselfto function as Relay UE for the UE_B 9, the UE_A 8 may transmit a se message to the UE_B 9.

The Relay Service Code and the ProSe Relay UE ID may be included in the Response message. rmore, the information on the UE_A 8 user may be included in the Response message. The information on the user may specifically be identification information of a group to which the UE_A 8 user belongs. rmore, the Response message may include information for identifying communication capability such as communication capacity ofthe PDN connection provided to the Remote UE by the UE_A 8. Alternatively, the UE_A 8 may respond by including position information in the Response message.

The UE_B 9 detects proximity Relay UE by ing the Response message from the UE_A 8. id="p-617" id="p-617" id="p-617" id="p-617" id="p-617"

[0617] At this time, the UE_B 9 may detect multiple pieces of Relay UE. To rephrase, the UE_B 9 may receive the Response message from the multiple pieces of Relay UE.

In a case where the UE_B 9 s the multiple pieces of Relay UE, the UE_B 9 may select the le pieces of Relay UE in consideration of remaining time ofthe timer corresponding to the Relay Service Code, Relay UE capability, a PDN connection communication state, or Relay UE position information.

In a case where the UE_B 9 selects the UE_A 8 as Relay UE, or in a case where the UE_B 9 receives the announcing signal only from the UE_A 8, the UE_B 9 ishes direct communication with the UE_A 8.

Specifically, the UE_B 9 transmits a —communication establishment request message to the UE_A 8. The UE_B 9 may transmit the direct-communication establishment request including the ProSe Relay UE ID of the UE_A 8.

The UE_A 8, in a case of receiving the t message from the UE_B 9, authenticates the UE_B 9 and establishes the direct communication tion. id="p-622" id="p-622" id="p-622" id="p-622" id="p-622"

[0622] The UE_B 9, after the establishment of the direct communication path with the UE_A 8, requests the UE_A 8 to assign an IP address. When the UE_B 9 ts IPv6, the UE_B 9 transmits a Router Solicitation message (RS signal) to the UE_A 8. The UE_A 8, in a case of receiving the RS signal, may configure, for the UE_B 9, an IP address to be assigned to the UE_B 9 from IPv6 prefix.

The UE_A 8 transmits a Router isement message (RA signal) to the UE_B 9. The assigned IP address is included in the RA signal. id="p-624" id="p-624" id="p-624" id="p-624" id="p-624"

[0624] Alternatively, when the UE_B 9 requests the assignment of IPv4, the UE_B 9 transmits a DHCPV4 discover to the UE_A 8. The UE_A 8, based on ing the detection message, selects an IP address from the pooled IP addresses and assigns the IP address to the UE_B 9. Furthermore, the UE_A 8 transmits a DHCPv4 offer message to the UE_B 9. The UE_A 8 includes the IP s assigned to the UE‘B 9 in the DHCPV4 offer.

The UE_B 9 having received the DHCP offer from the UE_A 8 transmits a DHSCP request including the received IP address. id="p-626" id="p-626" id="p-626" id="p-626" id="p-626"

[0626] The UE_A 8 having received the DHCP request from the UE_B 9 replies DHCP Ack as a response.

As discussed above, the IP address ofIPv6 or IPv4 is assigned to the UE_B 9, and connection to the PDN connection is provided to the UE_B 9. 2.2.3 Relay Service Code Update Procedure Next, a Relay Service Code update procedure will be described below.

The Relay e Code needs to be regularly updated from the standpoint of security. 1 Relay Service Code Update Procedure of Relay UE Hereinafter, an update procedure of the Relay Service Code stored in the UE_A 8 as Relay UE will be described.

The UE_A 8 can update the Relay Service Code in accordance with notification from the ProSe function unit_A 7, and continue the monitoring. id="p-631" id="p-631" id="p-631" id="p-631" id="p-631"

[0631] In the following description, the UE_A 8 that has obtained a Relay Service Code and a timer and has started counting of the timer for a connection e using the UE-to-NW Relay function, obtains a new ProSe Relay Service Code and a timer for the same connection service and makes the old Relay Service Code and timer invalid so as to use the new ProSe Relay e code and timer.

An initial state of the present procedure may be a state in which the ery request procedure discussed in 2.2.2.1 has been ted. id="p-633" id="p-633" id="p-633" id="p-633" id="p-633"

[0633] In other words, by the discovery request procedure as discussed in 2.2.2.1, the UE_A 8 may be in a state in which the UE_A 8 has obtained "C1" as the Relay Service Code and "T1" as the timer from the ProSe function unit_A 7.

A detailed description will be given below with reference to .

First, the UE_A 8 starts counting ofthe timer "T1" based on the discovery request procedure or the reception of the discovery response, and makes the Relay Server Code "C1" valid ). In addition, the ProSe function unit_A 7 starts counting of a timer "Tl'" corresponding to the timer "T1" after the transmission of the ery response, and makes the Relay Server Code "C1" valid (S1607).

As discussed in the discovery request procedure of 1, the UE_A 8 ofthe Response may perform the monitoring and the transmission procedure the timer "T1" being message based on the monitoring, during the counting of The UE_A 8 may request the Relay Service Code and a timer for the same relay tion service to the ProSe function unit_A 7 during the counting of the timer "T1" being executed. To rephrase, the UE_A 8 may newly request the Relay Service Code and timer to the ProSe function unit_A 7 before the timer "T1" expires.

The above re-request by the UE_A 8 may be performed when remaining time of the timer has become short. To be more specific, the UE_A 8 may store a threshold in advance, and may perform the re-request in the case where the remaining time of the timer becomes equal to the threshold or becomes shorter than the threshold. Furthermore, a trigger ofthe re-request is not limited thereto; the re-request may be performed under another condition, or may be performed at a freely-selected timing. [063 8] The UE_A 8 may transmit a discovery request to the ProSe function unit_A 7 in order to re-request the Relay Service Code and a timer for the same relay connection service (81608).

Here, the discovery request may be a discovery t message for the discovery procedure by the monitoring and the Response message transmission.

The discovery request e may be the discovery request message itted by the UE_A 8 as sed in the discovery request procedure of 2.2.2.1 (S1704). Because it is ent that the sing with regard to the transmission by the UE_A 8, the discovery request message configuration, information elements included in the discovery request message, and the like are similar to those discussed above, the detailed description thereof is omitted herein.

Note that, by including, in the ery request, the same APN as APN having been included in the previous discovery t, the UE_A 8 may indicate that the request message is a message for the same service.

Next, the ProSe function unit_A 7 receives the discovery request.

Furthermore, the Prose function unit_A 7 transmits a ery response as a Response message to the UE_A 8 (S1610). The ProSe function unit_A 7 may transmit the Response message including the Relay Service Code and the timer.

This ery response may be the discovery se e as discussed in 2.2.2.1 ($1710).

That is, the ProSe function unit_A 7 may transmit the discovery response including a discovery filter. A Relay Service Code and a timer may be ed in the discovery filter.

Here, a condition where the discovery response is itted may be such that the response is transmitted based on receiving the discovery request, or is transmitted based on the authentication. A specific method for the authentication to be performed here may be the method discussed in the discovery t procedure of 2.2.2.

Alternatively, the ProSe function unit_A 7 may update the ProSe Relay Service Code based on a network connection state or the operator policy without re-receiving the discovery request from the UE_A 8. The ProSe function unit_A 7 may notify the UE_A 8 of a notification e including the Relay Service Code updated by the ProSe function unitgA 7.

The notification e, like the discovery response, may include a discovery filter in which a timer value corresponding to the updated Relay Service Code and indicating a period oftime during which the Relay Service Code is valid.

Furthermore, the Relay Service Code and the timer included in the discovery response or the discovery filter of the notification message may include the old Relay Service Code "C1" having already been assigned and the remaining time ofthe timer "Tl" corresponding to the old Relay Service Code "Cl ". id="p-648" id="p-648" id="p-648" id="p-648" id="p-648"

[0648] Alternatively, the Relay Service Code and the timer included in the discovery response or the discovery filter of the notification message may include the new Relay Service Code "C2" ent from the Relay Service Code "Cl" and the timer "T2" corresponding to the new Relay Service Code "C2".

Here, the old Relay e Code "Cl" and the new Relay Service Code "C2" may pond to a single application ID.

Whether to transmit the old Relay Service Code or transmit the new Relay Service Code may be determined based on the following conditions or processing. id="p-651" id="p-651" id="p-651" id="p-651" id="p-651"

[0651] In a case that the remaining time ofthe timer T1 is short, the ProSe function unit_A 7 may transmit the information including the new Relay Service Code "C2" and the timer "T2". To be more specific, the ProSe function unit_A 7 may store a threshold in advance, and may transmit the information including the new Relay Service Code "C2" and timer "T2" in the case where the remaining time ofthe timer s equal to the threshold or becomes r than the threshold.

Meanwhile, in the case where the remaining time of the timer "Tl " is large enough, the ProSe function unit_A 7 may it the information including the old Relay Service Code "Cl" and the remaining time of the timer "Tl". To be more specific, the ProSe function unit_A 7 may store a threshold in advance, and may transmit the information including the new Relay Service Code "Cl" and the remaining time ofthe timer "T1" in the case where the remaining time of the timer is longer than the threshold or is equal to the threshold.

Alternatively, the ProSe function unit_A 7 may determine the above in accordance with the received ery request. The UE_A 8 may transmit the discovery t including identification information, for example.

This identification information may be such identification information that indicates r the UE_A 8 requests the old Relay Service Code or the new Relay Service Code. id="p-655" id="p-655" id="p-655" id="p-655" id="p-655"

[0655] The ProSe function unit_A 7 may transmit the information including the new Relay Service Code "C2" and timer "T2" based on the fication information. Alternatively, the ProSe function unit_A 7 may transmit the WO 02843 Al information including the old Relay Service Code "C l " and the remaining time of the timer "Tl " based on the identification information.

Furthermore, the ProSe function unit_A 7 may determine the above based on the presence/absence ofthe identification information. That is, the identification information may be such identification information that indicates a request for a new Relay Service Code. For example, the UE_A 8 may transmit a discovery request without including identification information and request the old Relay Service Code. atively, the UE_A 8 may transmit the discovery request including the identification information and request a new Relay Service Code.

Meanwhile, based on the fact that the identification information is not included in the discovery request, the ProSe function unit_A 7 may transmit the information including the old Relay Service Code "C1" and the remaining time of the timer "T1". The ProSe function unit_A 7 may transmit the information including the new Relay e Code "C2" and the timer "T2" based on the fact that the identification information is included in the ery request. [065 8] Alternatively, the identification information may be such identification information that tes a request for the old Relay Service Code. For example, the UE_A 8 may transmit the discovery request without including the identification information and request a new Relay e Code. Alternatively, the UE_A 8 may transmit the discovery request including the identification ation and request the old Relay Service Code.

The ProSe function unit_A 7 may transmit the information including the new Relay Service Code "C2" and the timer "T2" based on the fact that the identification information is not included in the discovery request. Meanwhile, based on the fact that the fication information is included in the discovery request, the ProSe function unit_A 7 may it the information including the old Relay Service Code "Cl" and the remaining time of the timer "T1".

The above-mentioned fication information may be an information element such as a flag included in the discovery request, or may be an information element indicating a message type of control message.

As discussed above, the ProSe function unit_A 7 may transmit the information ing the remaining time ofthe timer "T1" and may synchronize the timers of multiple pieces of UE.

This discovery request may be the discovery request discussed in 2.2.2.1.

Accordingly, the above-mentioned identification information may be included in the discovery request discussed in 2.2.2.1.

Whether the ProSe function unitMA 7 transmits the old Relay Service Code or the new Relay Service Code may also be determined based on the configuration of the ProSe function unit_A 7 or the like. For example, the configuration of the ProSe function unit_A 7 may be ined in ance with a Mobile Operator Policy of a network operator running the ProSe function unit_A 7 or an application operator policy, and then the determined configuration may be performed.

Note that the configuration may be determined while ing the conditions or processing having been discussed thus far, or may be ined based on other methods. id="p-665" id="p-665" id="p-665" id="p-665" id="p-665"

[0665] Next, the UE_A 8 receives the discovery response. Furthermore, the UE_A 8 s a Relay Service Code and a timer included in the discovery The UE_A 8 may obtain the Relay Service Code and the timer by acquiring the discovery response including the discovery filter.

In a case that the UE_A 8 obtains the new Relay Service Code "C2", or the UE_A 8 obtains a new discovery filter, the UE_A 8 may stop using ofthe old "C1" and may start using of the new Relay Service Code "C2" ).

Specifically, the UE_A 8 may perform an action in which the old Relay Service Code "C1" is made invalid while the new Relay Service Code "C2" is made valid, for example. id="p-669" id="p-669" id="p-669" id="p-669" id="p-669"

[0669] Furthermore, the UE_A 8 may stop the counting of the timer "T1" corresponding to the old Relay Service Code "Cl " and may start the ng of the timer "T2" corresponding to the new Relay Service Code "C2".

In addition, the UE_A 8 may delete the old Relay Service Code "C1" and the timer "Tl" from the storage unit.

The UE_A 8 may stop the monitoring using the old Relay Service Code "C1", and may set such a configuration that does not allow to perform the monitoring using the Relay Service Code "C1" after having stopped the monitoring using the Code "C1".

Furthermore, the ProSe function unit_A 7, in a case of transmitting the discovery response, may stop counting of "T1"' and start counting of "T2'" corresponding to the timer "T2" (81614).

The UE_A 8 may transmit the announcing signal using the new Relay Service Code "C2" until the timer "T2" ponding to the new Relay Service Code "C2" expires.

Furthermore, the UE_A 8 may determine whether to perform the update procedure of the Relay e Code, based on the configuration of the UE_A 8 or the like. For example, the configuration of the UE_A 8 may be ined in ance with a user policy, a Mobile Operator Policy of a network operator running the ProSe function unit_A 7, or an application operator policy, and then the determined configuration may be performed.

Note that the configuration may be determined while combining the conditions and processing having been discussed thus far, or may be determined based on other methods.

In addition, in the case where the UE_A8 does not perform the update procedure of the Relay Service Code, the UE_A 8 may ue the monitoring using the old Relay Service Code. For example, when the UE_A 8, in a case of ing the Response message, has obtained the old Relay Service Code "C1", the UE_A 8 may continue the monitoring using the old Relay Service Code "C1" until the timer "T1" being counted expires. Note that the UE_A 8 may update the timer value from the remaining time ofthe timer "Tl " to the received timer value, and ue the counting.

Alternatively, in the case where the UE_A 8 does not perform the update procedure of the Relay Service Code, the UE_A 8 may stop the monitoring using the old Relay Service Code and the new Relay Service Code.

Through the above—discussed procedure, the UE_A 8 can continue the monitoring corresponding to the connection service by a relay.

Note that, in the procedure of assigning the old Relay Service Code "Cl" and the timer "Tl ", when the ProSe Restricted Code "Crl " and the timer "Trl" have been assigned to the same Application ID, the UE_A 8 may update the ProSe Restricted Code and the timer during the Relay Service Code update procedure.

Alternatively, only the Relay Service Code and the timer may be updated. 2.2.3 2 Relay Service Code Update Procedure of Remote UE A Relay Service Code update procedure of Remote UE will be bed next. As illustrated in in the case where the Remote UE has already obtained the Relay e Code, the Remote UE may be outside the coverage.

In a case of the update of the Relay Service Code of the Relay UE, it is necessary that the Relay Service Code of the Remote UE can be d.

Specifically, for example, when the UE_A 8 is providing a PDN connection service using a relay by ProSe direct communication to a proximity al, the UE_A 8 may notify the proximity terminal of the update of the Relay e Code using the ProSe direct communication, based on the Relay Service Code and the timer having been updated. id="p-684" id="p-684" id="p-684" id="p-684" id="p-684"

[0684] To be specific, in the case where the UE_A 8 obtains the new Relay Service Code and the timer during providing the PDN connection by rely to the UE_B 9, the UE_A 8 may update the Relay Service Code and the timer, and notify the UE_B 9 of a notification message telling the update ofthe Relay Service Code over the ProSe direct communication.

The UE_A 8 may include, in the notification e, identification information for identifying that the notification message is a message telling the update of the Relay Service Code.

Alternatively, the UE_A 8 may implicitly stop, in a case of receiving the new Relay Service Code, providing the PDN connection to the UE_B 9.

The UE_B 9 receives the notification message from the UE_A 8. In a case of receiving the notification message from the UE_A 8 or in a case ofthe PDN connection service being implicitly stopped, the UE_B 9 transmits a discovery request message in order to update the Relay e Code and/or the timer. e the discovery t message transmitted from the UE_B 9 is similar to the discovery request message discussed in 2.2.2.2, the ed description thereof is omitted herein.

Like in the description of 2.2.2.2, when the UE_B 9 is present outside the coverage, the UE_A 8 as Relay UE may transfer the discovery request to the ProSe on unit_A 7.

The ProSe function unit_A 7 may assign, to the UE_B 9, a new Relay Service Code and a timer based on receiving the ery request.

Furthermore, the ProSe function unit_A 7 may transmit a discovery response to the UE_B 9 via the UE_A 8.

The discovery response message may include a new Relay Service Code and a new timer. id="p-693" id="p-693" id="p-693" id="p-693" id="p-693"

[0693] In a case that the UE_B 9 obtains a new Relay Service Code and a new timer, the UE_B 9 may stop the timer corresponding to the old Relay Service Code and update the Relay e Code and the timer.

The UE_B 9 may stop transmitting ofthe Solicitation message in a case of having stopped the timer.

The UE_B 9 may transmit a Solicitation message in a case of receiving the new Relay Service Code and timer.

In the manner discussed above, the Relay Service Code update procedure of Remote UE may be performed. To rephrase, in a case of receiving the notification from the Relay UE and in a case ofthe provision of the service being stopped, the Remote UE may obtain, by re-requesting a new Relay Service Code to the ProSe function unit, the new Relay Service Code and timer, and may update the Code. id="p-697" id="p-697" id="p-697" id="p-697" id="p-697"

[0697] 2.2.4 ation on Relay Service Code Update Procedure Although, in 2.2.3, an example of the procedure in which the UE_A 8 updates the Relay Service Code is described, a specific procedure is not limited to the present embodiment; it is to be noted that design, ations, and the like within a scope that does not depart from the spirit of the present invention are also included in the present invention.

The ure in which the Remote UE obtains and updates the Relay e Code for detecting the Relay UE using the Model B detection has been described thus far.

Moreover, the procedure in which the Remote UE, based on the detection, establishes a direct connection with the Relay UE and then establishes a PDN connection has also been described. id="p-700" id="p-700" id="p-700" id="p-700" id="p-700"

[0700] 3. Modification The ments of the invention have been described in detail thus far with reference to the drawings, but the specific ration is not limited to the ments. Other designs and the like that do not depart from the essential spirit ofthe ion also fall within the scope of the present invention.

Additionally, the programs run on the devices in the embodiments are each configured to control a CPU (program causing a computer to on) so as to realize the functions ofthe above—described embodiments. The information handled by these devices is temporarily held in a transitory storage device (RAM, for example) at the time of processing, and is then stored in various storage devices such as a ROM and an HDD, read out by the CPU as necessary, and edited and written.

Here, a semiconductor medium (a ROM, a non-volatile memory card, or the like, for example), an optical recording medium/magneto-optical recording medium (a Digital Versatile Disc (DVD), a Magneto Optical Disc (MO), a Mini Disc (MD), a Compact Disc (CD), a BD, or the like, for example), a magnetic recording medium (magnetic tape, a flexible disk, or the like, for example), and the like can be given as examples of recording media for storing the programs.

In addition to ing the functions ofthe above-described embodiments by executing loaded programs, the functions of the present invention are realized by the programs running cooperatively with an operating system, other application programs, or the like in accordance with ctions included in those ms. id="p-703" id="p-703" id="p-703" id="p-703" id="p-703"

[0703] When delivering these ms to market, the programs can be stored in a portable recording medium, or transferred to a server computer connected over a network such as the Internet. In this case, the storage device serving as the server computer is of course also included in the present invention. id="p-704" id="p-704" id="p-704" id="p-704" id="p-704"

[0704] Additionally, each device in the above-described embodiments may be lly or completely realized as a Large Scale Integration (LSI) circuit, which is a typical integrated circuit. The functional blocks of each device may be individually realized as chips, or may be partially or completely integrated into a chip. The circuit integration technique is not limited to LSI, and the integrated circuits for the functional blocks may be ed as ted ts or a general-purpose processor. rmore, in a case where advances in semiconductor technology produce circuit integration technology capable of replacing the LSI, it is of course possible to use integrated circuits based on the technology.

Additionally, although, for the above-described embodiments, the LTE and the WLAN (IEEE a/b/n, for example) have been described as examples of the radio access network, the connections may be made with WiMAX instead of the WLAN.

Reference Signs List 1 ication system 2 Core network 3 IP mobile communication network_A PDN_A 7 ProSe function unit_A 8 UE_A 9 UE_B 50 HSS_A 60 PCRF_A 55 AAA_A PGW_A 65 ePDG_A SGWmA 40 MME_A so LTE AN_A 75 WLAN ANb 70 WLAN ANa 45 eNB_A 76 WLAN APb 72 WLAN APa

Claims (4)

Claims

1. A User Equipment (UE) comprising: a transmission and/or ion unit configured to: transmit, to a device equipped with a ProSe function, a t message for a first service authorization, to request authorization for the UE to be ly detected as a relay User Equipment (UE) by a proximity User Equipment (UE) positioned in proximity to the UE, or to request authorization for the UE to perform direct communication with the proximity UE; receive, from the device equipped with the ProSe function, an authorization message for the request e; and receive a Relay Service Code from the device ed with the ProSe function, wherein the Relay Service Code is a code indicating a connectivity service provided by the UE, and a control unit configured to start counting a timer, in a case of receiving a timer value included in the authorization e and indicating a period of time during which the first service authorization for the connectivity service is valid.

2. A communication control method performed by a User Equipment (UE), the communication control method comprising: transmitting, to a device ed with a ProSe function, a request message for a first service authorization, to request authorization for the UE to be directly detected as a relay User Equipment (UE) by a ity User Equipment (UE) positioned in proximity to the UE, or to request authorization for the UE to perform direct communication with the proximity UE; receiving, from the device equipped with the ProSe on, an authorization message for the request message; receiving a Relay Service Code from the device equipped with the ProSe function, wherein the Relay Service Code is a code indicating a connectivity service provided by the UE, and starting counting a timer, in a case of ing a timer value ed in the authorization message and indicating a period of time during which the first service authorization for the connectivity service is valid.

3. A User ent (UE) according to claim 1, substantially as herein described or exemplified.

4. A communication control method according to claim 2, substantially as herein described or exemplified. WO 02843 A1