Management of system information block segmentation

1. A method for a user equipment (UE) for assembling a target system information block (SIB) for a target service, the method comprising:

receiving, from a first cell on a first frequency carrier, a plurality of SIB segments of the target SIB, each of the plurality of SIB segments associated with a corresponding value tag;

storing a first SIB segment in the plurality of SIB segments in a memory of the UE;

for each subsequent SIB segment in the plurality of SIB segments:

determining whether a corresponding value tag of the subsequent SIB segment is the same as the corresponding value tag of the first SIB segment; and

storing the subsequent SIB segment in the memory of the UE when the corresponding value tag of the subsequent SIB segment is the same as the corresponding value tag of the first SIB segment; and

assembling the target SIB using the stored plurality of SIB segments.

2. The method of claim 1 , further comprising:

selecting, by the UE, a second cell on the first frequency carrier before the assembling of the target SIB successfully; and

dropping the stored SIB segments of the plurality of SIB segments after selecting the second cell.

3. The method of claim 2 , wherein:

the first frequency carrier comprises a serving frequency carrier for the UE, and

the first cell and the second cell are serving cells of the UE.

4. The method of claim 2 , wherein:

the first frequency carrier comprises a non-serving frequency carrier for the UE, and

the first cell and the second cell are not serving cells of the UE.

5. The method of claim 1 , further comprising, when the corresponding value tag of the subsequent SIB segment is not the same as the corresponding value tag of the first SIB segment:

storing the subsequent SIB segment in the memory of the UE; and

removing the first SIB segment and all previously stored SIB segments that have the same value tag as the first SIB segment from the memory.

6. The method of claim 1 , further comprising:

after assembling the target SIB successfully, configuring a validity area of the target SIB with a first area identification (ID) if the target SIB is associated with a first areascope information element (IE), wherein both the first areascope IE and the first area ID are broadcast by the first cell;

selecting, by the UE, a second cell on the first frequency carrier, the second cell broadcasting a second areascope IE and a second area ID associated with a second SIB which is configured by the second cell to support the same target service; and

determining that the assembled target SIB is still valid during the selection of the second cell if the second area ID is the same as the first area ID associated with the target SIB.

7. The method of claim 6 , further comprising:

selecting, by the UE, a third cell on the first frequency carrier, the third cell broadcasting a third area ID, which is different from the first area ID associated with the target SIB; and

determining that the target SIB is not valid during the selection of the third cell.

8. The method of claim 6 , further comprising:

selecting, by the UE, a third cell on the first frequency carrier, wherein the third cell does not broadcast any SIB related information that supports the same target service, or the third cell broadcasts data associated with a third SIB that supports the same target service but does not have an associated areascope IE; and

determining that the assembled target SIB is not valid during the selection of the third cell.

9. The method of claim 1 , further comprising:

after assembling the target SIB successfully, configuring downlink coverage of the first cell as a validity area associated with the target SIB on the UE if the target SIB is not associated with any areascope information element (IE) sent by the first cell.

10. The method of claim 1 , wherein the target service comprises a new radio (NR) sidelink communication service and the target SIB includes an NR sidelink radio configuration, the method further comprising:

after reselecting another cell on the first frequency carrier, implementing the NR sidelink communication service based on the NR sidelink radio configuration in the assembled target SIB if the assembled target SIB is determined to be valid on the reselected cell.

11. A user equipment (UE), comprising:

one or more non-transitory computer-readable media having computer-executable instructions for assembling a target system information block (SIB) for a target service; and

at least one processor coupled to the one or more non-transitory computer-readable media, and configured to execute the computer-executable instructions to:

receive, from a first cell on a first frequency carrier, a plurality of SIB segments of the target SIB, each of the plurality of SIB segments associated with a corresponding value tag;

store a first SIB segment in the plurality of SIB segments in a memory of the UE;

for each subsequent SIB segment in the plurality of SIB segments:

determine whether a corresponding value tag of the subsequent SIB segment is the same as the corresponding value tag of the first SIB segment; and

store the subsequent SIB segment in the memory of the UE when the corresponding value tag of the subsequent SIB segment is the same as the corresponding value tag of the first SIB segment; and

assemble the target SIB using the stored plurality of SIB segments.

12. The UE of claim 11 , wherein the at least one processor is further configured to execute the computer-executable instructions to:

select a second cell on the first frequency carrier before the assembling of the target SIB successfully; and

drop the stored SIB segments of the plurality of SIB segments after selecting the second cell.

13. The UE of claim 12 , wherein:

the first frequency carrier comprises a serving frequency carrier for the UE, and

the first cell and the second cell are serving cells of the UE.

14. The UE of claim 12 , wherein:

the first frequency carrier comprises a non-serving frequency carrier for the UE, and

the first cell and the second cell are not serving cells of the UE.

15. The UE of claim 11 , wherein the at least one processor is further configured to execute the computer-executable instructions to, when the corresponding value tag of the subsequent SIB segment is not the same as the corresponding value tag of the first SIB segment:

store the subsequent SIB segment in the memory of the UE; and

remove the first SIB segment and all previously stored SIB segments that have the same value tag as the first SIB segment from the memory.

16. The UE of claim 11 , wherein the at least one processor is further configured to execute the computer-executable instructions to:

after assembling the target SIB successfully, configure a validity area of the target SIB with a first area identification (ID) if the target SIB is associated with a first areascope information element (IE), wherein both the first areascope IE and the first area ID are broadcast by the first cell;

select a second cell on the first frequency carrier, the second cell broadcasting a second areascope IE and a second area ID associated with a second SIB which is configured by the second cell to support the same target service; and

determine that the assembled target SIB is still valid during the selection of the second cell if the second area ID is the same as the first area ID associated with the target SIB.

17. The UE of claim 16 , wherein the at least one processor is further configured to execute the computer-executable instructions to:

select a third cell on the first frequency carrier, the third cell broadcasting a third area ID, which is different from the first area ID associated with the target SIB; and

determine that the target SIB is not valid during the selection of the third cell.

18. The UE of claim 16 , wherein the at least one processor is further configured to execute the computer-executable instructions to:

select a third cell on the first frequency carrier, wherein the third cell does not broadcast any SIB related information that supports the same target service, or the third cell broadcasts data associated with a third SIB that supports the same target service but does not have an associated areascope IE; and

determine that the assembled target SIB is not valid during the selection of the third cell.

19. The UE of claim 11 , wherein the at least one processor is further configured to execute the computer-executable instructions to:

after assembling the target SIB successfully, configure downlink coverage of the first cell as a validity area associated with the target SIB on the UE if the target SIB is not associated with any areascope information element (IE) sent by the first cell.

20. The UE of claim 11 , wherein the target service comprises a new radio (NR) sidelink communication service and the target SIB includes an NR sidelink radio configuration, wherein the at least one processor is further configured to execute the computer-executable instructions to:

after reselecting another cell on the first frequency carrier, implement the NR sidelink communication service based on the NR sidelink radio configuration in the assembled target SIB if the assembled target SIB is determined to be valid on the reselected cell.