Method and apparatus for avoiding resource collision in mobile communication system

1. A method for avoiding resource collision by a first user equipment (UE) in a mobile communication system, the method comprising:

receiving, by the first UE, scheduling assign (SA) information of a second UE, the SA information including information associated with an interest identifier (ID) of the second UE; and

selecting, based on the SA information, a first resource for the first UE, the first resource being different from a second resource selected for the second UE,

wherein the interest ID includes group ID or individual ID associated with an interest of the second UE.

2. The method of claim 1 , wherein the SA information includes at least one of a resource pattern or index, priority information of a UE or subscriber, quality of service (QoS) class of data to be transmitted, a location, and an SA count.

3. The method of claim 2 , wherein when the location indicates that the UE is in coverage, the UE acquires a transmission location of the SA information from an evolved Node B (eNB).

4. The method of claim 2 , wherein if the location indicates that the UE is out of coverage, the UE acquires SA information of another UE, and determine a transmission location of the SA information of the other UE and a data transmission index.

5. The method of claim 2 , further comprising:

when the second UE occupies resources and the first UE has entered a new network, receiving, by the first UE, the SA information from the second UE;

determining whether a user priority is high or low;

when the user priority is high, avoiding resources; and

when the user priority is equal or low, determining whether the interest ID matches.

6. The method of claim 5 , further comprising:

when the interest ID does not match, selecting resources by avoiding a resource region where a collision occurs;

when the interest ID does match, determining whether a SA count value is 0;

if the SA count value is 0, selecting resources without considering resources of the second UE; and

if the SA count value is not 0, selecting resources in consideration of resources of the second UE.

7. The method of claim 6 , further comprising:

determining a QoS of the second UE;

when the QoS of the second UE is low, selecting resources without considering resources of the second UE;

when the QoS of the second UE is high, determining whether a data transmission delay function is possible;

if the data transmission delay function is possible, transmitting data in a next cycle without transmitting the data in a device-to-device (D2D) transmission cycle; and

if the data transmission delay function is not possible, selecting resources without considering resources of the second UE.

8. The method of claim 1 , wherein the resources for the first UE are distinguished from the resources for the second UE in terms of at least one of a time domain or a frequency domain.

9. The method of claim 1 , further comprising:

when the first UE and the second UE occupy resources, changing, by the first UE, to a listen mode in a particular cycle;

receiving the SA information from the second UE;

determining whether a user priority is high or low;

when the user priority is high, selecting resources by avoiding a resource region where a collision occurs; and

when the user priority is equal or low, determining whether an interest ID matches.

10. The method of claim 9 , further comprising:

when the interest ID does not match, selecting resources by avoiding a resource region where a collision occurs;

when the interest ID does matches, determining whether a SA count value is 0;

if the SA count value is 0, selecting resources without considering resources of the second UE; and

if the SA count value is not 0, selecting resources in consideration of resources of the second UE.

11. The method of claim 10 , further comprising:

determining a QoS of the second UE;

when the QoS of the second UE is low, selecting resources without considering resources of the second UE;

when the QoS of the second UE is high, determining whether a data transmission delay function is possible;

if the data transmission delay function is possible, transmitting data in a next cycle without transmitting the data in a device-to-device (D2D) transmission cycle; and

if the data transmission delay function is not possible, selecting resources without considering resources of the second UE.

12. An apparatus for avoiding resource collision by a first user equipment (UE) in a mobile communication system, the apparatus comprising:

a controller configured to

receive scheduling assign (SA) information of a second UE, the SA information including information associated with an interest identifier (ID) of the second UE, and

select, based on the SA information, a first resource for the first UE, the first resource being different from a second resource selected for the second UE,

wherein the interest ID includes group ID or individual ID associated with an interest of the second UE.

13. The apparatus of claim 12 , wherein the SA information includes at least one of a resource pattern or index, priority information of a UE or subscriber, quality of service (QoS) class of data to be transmitted, a location, and an SA count.

14. The apparatus of claim 13 , wherein when the location indicates that the UE is in coverage, the controller is configured to acquire a transmission location of the SA information from an evolved Node B (eNB).

15. The apparatus of claim 13 , wherein when the location indicates that the UE is in coverage, the controller is configured to acquire SA information of another UE, and determine a transmission location of the SA information of the other UE and a data transmission index.

16. The apparatus of claim 12 , wherein the resources for the first UE are distinguished from the resources for the second UE in terms of at least one of a time domain or a frequency domain.

17. The apparatus of claim 12 , wherein when the second UE occupies resources and the first UE has entered a new network, the controller is configured to:

receive the SA information from the second UE; determine whether a user priority is high or low;

when the user priority is high, avoid resources; and

when the user priority is equal or low, determine whether the interest ID matches.

18. The apparatus of claim 17 , wherein the controller is configured to:

when the interest ID does not match, select resources by avoiding a resource region where a collision occurs;

when the interest ID does matches, determine whether a SA count value is 0;

if the SA count value is 0, select resources without considering resources of the second UE; and

if the SA count value is not 0, select resources in consideration of resources of the second UE.

19. The apparatus of claim 18 , wherein the controller is configured to:

determine a QoS of the second UE;

when the QoS of the second UE is low, select resources without considering resources of the second UE;

when the QoS of the second UE is high, determine whether a data transmission delay function is possible;

if the data transmission delay function is possible, transmit data in a next cycle without transmitting the data in a device-to-device (D2D) transmission cycle; and

if the data transmission delay function is not possible, select resources without considering resources of the second UE.

20. The apparatus of claim 12 , wherein when the first UE and the second UE occupy resources, the controller is configured to:

change to a listen mode in a particular cycle;

receive the SA information from the second UE;

determine whether a user priority is high or low;

when the user priority is high, select resources by avoiding a resource region where a collision occurs; and

when the user priority is equal or low, determining whether an interest ID matches.

21. The apparatus of claim 20 , wherein the controller is configured to:

when the interest ID does not match, select resources by avoiding a resource region where a collision occurs;

when the interest ID does matches, determine whether a SA count value is 0;

if the SA count value is 0, select resources without considering resources of the second UE; and

if the SA count value is not 0, select resources in consideration of resources of the second UE.

22. The apparatus of claim 21 , wherein the controller is configured to:

determine a QoS of the second UE;

when the QoS of the second UE is low, select resources without considering resources of the second UE;

when the QoS of the second UE is high, determine whether a data transmission delay function is possible;

if the data transmission delay function is possible, transmit data in a next cycle without transmitting the data in a device-to-device (D2D) transmission cycle; and

if the data transmission delay function is not possible, select resources without considering resources of the second UE.