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1. (WO2018041757) SYSTEM AND METHODS OF SENDING AND RECEIVING A RELAY NOTIFICATION
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CLAIMS

1 . A system (1 ) for sending a relay notification, comprising:

- a receiver (3);

- a transmitter (3); and

- at least one processor (5) configured to use said receiver to receive a request for allowing a mobile device (1 1 ) to be used by a further mobile device (21 ) as a relay to a mobile communication network (7), to determine a unique identifier of said further mobile device (21 ) based on said request, to determine whether said mobile device (1 1 ) is to act as a relay for said further mobile device (21 ) based on said unique identifier of said further mobile device (21 ), and to use said transmitter (3) to notify said mobile device (1 1 ) that it is to act as a relay for said further mobile device (21 ) in dependence on said determination.

2. A system (1 ) as claimed in claim 1 , wherein said unique identifier comprises a permanent identifier of said mobile device identifying said mobile device in said mobile communication network and/or a temporary identifier of said mobile device identifying said mobile device in said mobile communication network.

3. A system (1 ) as claimed in claim 2, wherein said unique identifier comprises an International Mobile Subscriber Identity, a Globally Unique Temporary UE Identity, a

Proximity Services identifier, and/or a C-RNTI.

4. A system (1 ) as claimed in claim 1 or 3, wherein said at least one processor (5) is further configured:

- to determine a unique identifier of said mobile device (1 1 ) based on said request; and

- to determine a relation between said mobile device (1 1 ) and said further mobile device (21 ) based on said unique identifier of said mobile device (1 1 ) and said unique identifier of said further mobile device (21 ); and wherein said at least one processor (5) is configured:

- to determine whether said mobile device (1 1 ) is to act as a relay for said further mobile device (21 ) based on said relation.

5. A system (1 1 ) as claimed in any one of claims 1 to 4, wherein said at least one processor (5) is further configured:

- to obtain information relating to said further mobile device (21 ) based on said unique identifier of said further mobile device (21 ); and wherein said at least one processor (5) is configured:

- to determine whether said mobile device (1 1 ) is to act as a relay for said further mobile device (21 ) based on said information relating to said further mobile device (21 ).

6. A system (1 ) as claimed in claim 5, wherein said at least one processor (5) is configured to obtain said information from a database (31 ) in said mobile communication network (7) and/or from a trusted third party server (33).

7. A system (1 ) as claimed in any one of the preceding claims, wherein said at least one processor (5) is configured:

- to obtain information relating to said further mobile device (21 ) based on said unique identifier of said further mobile device (21 );

- to determine a unique identifier of said mobile device (1 1 ) based on said request;

- to obtain information relating to said mobile device (1 1 ) based on said unique identifier of said mobile device (1 1 );

- to determine a relation between said mobile device (1 1 ) and said further mobile device (21 ) based on said information relating to said mobile device (1 1 ) and on said information relating to said further mobile device (21 ); and

- to determine whether said mobile device (1 1 ) is to act as a relay for said further mobile device (21 ) based on said relation.

8. A system (1 ) as claimed in any one of the preceding claims, wherein said at least one processor (5) is further configured:

- to determine whether data use can be charged to said further mobile device (21 ) based on said unique identifier of said further mobile device (21 ) and wherein said at least one processor (5) is configured:

- to determine whether said mobile device (1 1 ) is to act as a relay for said further mobile device (21 ) in dependence on whether data use can be charged to said further mobile device (1 1 ).

9. A system (1 ) as claimed in any one of the preceding claims, wherein said at least one processor (5) is configured to implement a 3GPP Proximity Services Function.

10. A mobile device (1 1 ), comprising:

- a receiver (13);

- a transmitter (13); and

- at least one processor (15) configured to use said receiver (13) to receive a notification from a system (1 ), said notification notifying said mobile device (1 1 ) that it is to act as a relay to a mobile communication network (7) comprising said system (1 ) for said further mobile device (21 ), and to use said receiver (13) and said transmitter (13) to start relaying data received from said further mobile device (21 ) to said mobile communication network (7) upon receiving said notification.

1 1 . A mobile device (1 1 ) as claimed in claim 10, wherein said at least one processor (15) is configured to receive said identifier from the system (1 ) of any claims 1 to 9.

12. A method of sending a relay notification, comprising the steps of:

- receiving (41 ) a request for allowing a mobile device to be used by a further mobile device as a relay to a mobile communication network;

- determining (43) a unique identifier of said further mobile device based on said request;

- determining (61 ) whether said mobile device is to act as a relay for said further mobile device based on said unique identifier of said further mobile device; and

- notifying (63) said mobile device that it is to act as a relay for said further mobile device in dependence on said determination.

13. A method of receiving a relay notification, comprising the steps of:

- receiving (71 ) a notification from a system in a mobile communication network on a mobile device, said notification notifying said mobile device that it is to act as a relay to said mobile communication network for a further mobile device; and

- starting relaying (73) data received from said further mobile device to said mobile communication network upon receiving said notification.

14. A computer program or suite of computer programs comprising at least one software code portion or a computer program product storing at least one software code portion, the software code portion, when run on a computer system, being configured for performing the method of any one of claims 12 and 13.