Sidelink resource pool configuration for sidelink communications

1. A method comprising:

receiving, by a wireless device from a base station, a first configuration message comprising one or more cell specific time division duplex (TDD) uplink (UL)-downlink (DL) patterns, each cell specific TDD UL-DL pattern indicating a number of uplink slots and a slot configuration period;

determining, by the wireless device, a size of a sidelink resource pool bitmap and a sidelink resource pool configuration period based on the one or more slot configuration periods associated with the one or more cell specific TDD UL-DL patterns, wherein the size of the sidelink resource pool bitmap is indicative of a number of sidelink slots;

receiving, from the base station and based on the size of the sidelink resource pool bitmap, a second configuration message comprising the sidelink resource pool bitmap;

determining whether the size of the sidelink resource pool bitmap is larger than a first number of a first set of uplink slots associated with a first cell specific TDD UL-DL pattern;

in response to determining that the size of the sidelink resource pool bitmap is larger than the first number of the first set of uplink slots, applying a first portion of the sidelink resource pool bitmap to the first set of the uplink slots and applying the second portion of the sidelink resource pool bitmap to a second set of uplink slots associated with a second cell specific TDD UL-DL pattern sequentially;

determining, based on the applying, one or more sidelink slots within the sidelink resource pool configuration period; and

transmitting one or more transport blocks via the one or more sidelink slots.

2. The method of claim 1 , wherein the uplink slots comprise full uplink slots and non-full uplink slots.

3. The method of claim 2 , wherein the full uplink slots are determined based on the number of uplink slots.

4. The method of claim 2 , wherein the non-full uplink slots are determined based on a number of uplink symbols in a slot.

5. The method of claim 4 , wherein the cell specific TDD UL-DL pattern further comprises the number of uplink symbols.

6. The method of claim 4 , wherein the determining the size of the sidelink resource pool bitmap is further based on the number of uplink symbols.

7. The method of claim 4 , wherein the determining the one or more sidelink slots of the sidelink resource pool bitmap further comprises applying the sidelink resource pool bitmap to the non-full uplink slots based on the number of uplink symbols.

8. The method of claim 7 , wherein the applying further comprises applying the sidelink resource pool bitmap to a first non-full uplink slot when a number of uplink symbols in the first non-full uplink slot is greater than a threshold.

9. The method of claim 8 , wherein the threshold is indicated by the base station.

10. The method of claim 8 , wherein the threshold is preconfigured.

11. A wireless device comprising:

one or more processors; and

memory storing instructions that, when executed by the one or more processors, cause the wireless device to:

receive, from a base station, a first configuration message comprising one or more cell specific time division duplex (TDD) uplink (UL)-downlink (DL) patterns, each cell specific TDD UL-DL pattern indicating a number of uplink slots and a slot configuration period;

determine a size of a sidelink resource pool bitmap and a sidelink resource pool configuration period based on the one or more slot configuration periods associated with the one or more cell specific TDD UL-DL patterns, wherein the size of the sidelink resource pool bitmap is indicative of a number of sidelink slots;

receive, from the base station and based on the size of the sidelink resource pool bitmap, a second configuration message comprising the sidelink resource pool bitmap;

determine whether the size of the sidelink resource pool bitmap is larger than a first number of a first set of uplink slots associated with a first cell specific TDD UL-DL pattern;

in response to determining that the size of the sidelink resource pool bitmap is larger than the first number of the first set of uplink slots, apply a first portion of the sidelink resource pool bitmap to the first set of the uplink slots and apply the second portion of the sidelink resource pool bitmap to a second set of uplink slots associated with a second cell specific TDD UL-DL pattern sequentially;

determine, based on the applying, one or more sidelink slots within the sidelink resource pool configuration period; and

transmit one or more transport blocks via the one or more sidelink slots.

12. The wireless device of claim 11 , wherein the uplink slots comprise full uplink slots and non-full uplink slots.

13. The wireless device of claim 12 , wherein the full uplink slots are determined based on the number of uplink slots.

14. The wireless device of claim 12 , wherein the non-full uplink slots are determined based on a number of uplink symbols in a slot.

15. The wireless device of claim 14 , wherein the cell specific TDD UL-DL pattern further comprises the number of uplink symbols.

16. The wireless device of claim 14 , wherein the determining the size of the sidelink resource pool bitmap is further based on the number of uplink symbols.

17. The wireless device of claim 14 , wherein the determining the one or more sidelink slots of the sidelink resource pool bitmap further comprises applying the sidelink resource pool bitmap to the non-full uplink slots based on the number of uplink symbols.

18. The wireless device of claim 17 , wherein the applying further comprises applying the sidelink resource pool bitmap to a first non-full uplink slot when a number of uplink symbols in the first non-full uplink slot is greater than a threshold.

19. The wireless device of claim 18 , wherein the threshold is indicated by the base station or the threshold is preconfigured.

20. A system comprising:

a base station comprising:

one or more first processors; and

first memory storing first instructions that, when executed by the one or more first processors, cause the base station to:

transmit a first configuration message comprising one or more cell specific time division duplex (TDD) uplink (UL)-downlink (DL) patterns, each cell specific TDD UL-DL pattern indicating a number of uplink slots and a slot configuration period; and

transmit a second configuration message comprising a sidelink resource pool bitmap; and

a wireless device comprising:

one or more second processors; and

second memory storing second instructions that, when executed by the one or more second processors, cause the wireless device to:

receive, from the base station, the first configuration message comprising the one or more cell specific TDD UL-DL patterns, each cell specific TDD UL-DL pattern indicating the number of uplink slots and the slot configuration period;

determine a size of the sidelink resource pool bitmap and a sidelink resource pool configuration period based on the one or more slot configuration periods associated with the one or more cell specific TDD UL-DL patterns, wherein the size of the sidelink resource pool bitmap is indicative of a number of sidelink slots;

receive, from the base station and based on the size of the sidelink resource pool bitmap, the second configuration message comprising the sidelink resource pool bitmap;

determine whether the size of the sidelink resource pool bitmap is larger than a first number of a first set of uplink slots associated with a first cell specific TDD UL-DL pattern;

in response to determining that the size of the sidelink resource pool bitmap is larger than the first number of the first set of uplink slots, apply a first portion of the sidelink resource pool bitmap to the first set of the uplink slots and apply the second portion of the sidelink resource pool bitmap to a second set of uplink slots associated with a second cell specific TDD UL-DL pattern sequentially;

determine, based on the applying, one or more sidelink slots within the sidelink resource pool configuration period; and

transmit one or more transport blocks via the one or more sidelink slots.