Method and apparatus for determining resource pool

1. A method of determining a resource pool for a sidelink transmission, the method comprising:

receiving, at a mobile device and from an evolved NodeB (eNB), resource pool configuration information, the resource pool configuration information comprising a bitmap to determine the resource pool;

determining, for a period having a plurality of consecutive subframes, a first subset of subframes by excluding, from the plurality of consecutive subframes:

subframes in which a sidelink synchronization signal (SLSS) resource is configured; and

subframes other than uplink subframes;

determining, for the period, a second subset of subframes by excluding, from the first subset of subframes, one or more subframes, wherein a quantity of the second subset of subframes corresponds to an integer multiple of a length of the bitmap; and

determining, based on a plurality of repetitions of the bitmap, the resource pool for a sidelink transmission from the second subset of subframes.

2. The method of claim 1 , further comprising:

receiving, at the mobile device and from the eNB, a downlink control information (DCI) indicating the sidelink transmission;

determining, based on the DCI, a data transmission subframe, among the resource pool, for transmitting sidelink data; and

transmitting, to another mobile device and in the determined data transmission subframe, the sidelink data.

3. The method of claim 2 , further comprising:

receiving, from the eNB, information of a resource reservation interval;

determining, based on the determined data transmission subframe and the resource reservation interval, one or more transmission reservation subframes; and

reserving a transmission of the sidelink data in the one or more transmission reservation subframes.

4. The method of claim 1 , wherein the subframes other than uplink subframes are Time Division Duplex (TDD) downlink subframes and TDD special subframes.

5. The method of claim 1 , further comprising receiving, at the mobile device and from the eNB, SLSS configuration information indicating the SLSS resource.

6. The method of claim 1 , further comprising determining the period based on a system frame number (SFN) reset period or a direct frame number (DFN) reset period.

7. The method of claim 1 , wherein the mobile device comprises one or more of: a vehicle-to-everything (V2X) device or a vehicle-to-vehicle (V2V) device, and

wherein the resource pool for a sidelink transmission corresponds to one or more of: a resource pool for a V2X sidelink communication or a resource pool for a V2V sidelink communication.

8. The method of claim 1 , wherein the determining the second subset of subframes comprises:

determining a quantity of the first subset of subframes;

performing a modulo operation based on the quantity of the first subset of subframes and a quantity of bits in the bitmap; and

determining the one or more subframes based on the modulo operation.

9. A method of determining a resource pool for a sidelink transmission, the method comprising:

receiving, at a mobile device and from an evolved NodeB (eNB), resource pool configuration information, the resource pool configuration information comprising a bitmap to determine the resource pool;

determining, for a period having a plurality of Frequency Division Duplex (FDD) subframes, a first subset of subframes by excluding, from the plurality of FDD subframes, subframes in which a sidelink synchronization signal (SLSS) resource is configured;

determining, for the period, a second subset of subframes by excluding, from the first subset of subframes, one or more subframes, wherein a quantity of the second subset of subframes corresponds to an integer multiple of a length of the bitmap; and

determining, based on a plurality of repetitions of the bitmap, the resource pool for a sidelink transmission from the second subset of subframes.

10. The method of claim 9 , further comprising:

receiving, at the mobile device and from the eNB, a downlink control information (DCI) indicating the sidelink transmission;

determining, based on the DCI, a data transmission subframe, among the resource pool, for transmitting sidelink data; and

transmitting, to another mobile device and in the determined data transmission subframe, the sidelink data.

11. The method of claim 10 , further comprising:

receiving, from the eNB, information of a resource reservation interval;

determining, based on the determined data transmission subframe and the resource reservation interval, one or more transmission reservation subframes; and

reserving a transmission of the sidelink data in the one or more transmission reservation subframes.

12. The method of claim 9 , further comprising receiving, at the mobile device and from the eNB, SLSS configuration information indicating the SLSS resource.

13. The method of claim 9 , further comprising determining the period based on a system frame number (SFN) reset period or a direct frame number (DFN) reset period.

14. The method of claim 9 , wherein the mobile device comprises one or more of: a vehicle-to-everything (V2X) device or a vehicle-to-vehicle (V2V) device, and

wherein the resource pool for a sidelink transmission corresponds to one or more of: a resource pool for a V2X sidelink communication or a resource pool for a V2V sidelink communication.

15. The method of claim 9 , wherein the determining the second subset of subframes comprises:

determining a quantity of the first subset of subframes;

performing a modulo operation based on the quantity of the first subset of subframes and a quantity of bits in the bitmap; and

determining the one or more subframes based on the modulo operation.

16. A method of determining a resource pool for a sidelink transmission, the method comprising:

receiving, at a mobile device and from an evolved NodeB (eNB), resource pool configuration information, the resource pool configuration information comprising a bitmap to determine the resource pool;

determining, for a period having a plurality of consecutive subframes, a first subset of subframes by excluding, from the plurality of consecutive subframes:

subframes in which a sidelink synchronization signal (SLSS) resource is configured; and

subframes other than uplink subframes;

performing a modulo operation based on a quantity of the first subset of subframes and a length of the bitmap to determine one or more subframes to be excluded from the first subset of subframes;

determining, for the period, a second subset of subframes by excluding, from the first subset of subframes, the one or more subframes, wherein a quantity of the second subset of subframes corresponds to an integer multiple of the length of the bitmap; and

determining, based on a plurality of repetitions of the bitmap, the resource pool for a sidelink transmission from the second subset of subframes.

17. The method of claim 16 , wherein the subframes other than uplink subframes are Time Division Duplex (TDD) downlink subframes and TDD special subframes.

18. The method of claim 16 , further comprising receiving, at the mobile device and from the eNB, SLSS configuration information indicating the SLSS resource.

19. The method of claim 16 , further comprising determining the period based on a system frame number (SFN) reset period or a direct frame number (DFN) reset period.

20. The method of claim 16 , wherein the mobile device comprises one or more of: a vehicle-to-everything (V2X) device or a vehicle-to-vehicle (V2V) device, and wherein the resource pool for a sidelink transmission corresponds to one or more of: a resource pool for a V2X sidelink communication or a resource pool for a V2V sidelink communication.