Transmitting a TB after successful LBT procedure
Apparatuses, methods, and systems are disclosed for transmitting UL data in an access network using unlicensed spectrum. One apparatus includes a processor that performs a first LBT procedure for transmission of a first TB associated with a first UL grant using a first HARQ process, where the first LBT procedure results in LBT failure, the first TB being stored in a transmission buffer of the first HARQ process. The processor also performs a second LBT procedure for transmission of a second TB associated with a second UL grant using a second HARQ process. The apparatus includes a transceiver that transmits the first TB using the second UL grant associated with the second HARQ process in response to the second LBT procedure resulting in LBT success.
1. A method of a remote unit comprising:
performing a first listen-before-talk (“LBT”) procedure for transmission of a first transport block (“TB”) associated with a first uplink (“UL”) grant using a first Hybrid Automatic Repeat Request (“HARQ”) process, wherein the first LBT procedure results in LBT failure, wherein the first TB is stored in a transmission buffer of the first HARQ process;
performing a second LBT procedure for transmission of a second TB associated with a second UL grant using a second HARQ process; and
transmitting the first TB using the second UL grant associated with the second HARQ process in response to the second LBT procedure resulting in LBT success.
2. The method of claim 1 , wherein the first UL grant comprises a first UL allocation of a multiple Physical Uplink Shared Channel (“multi-PUSCH”) grant.
3. The method of claim 2 , wherein the second UL grant comprises a second UL allocation of the multi-PUSCH grant.
4. The method of claim 3 , wherein the multiple UL allocations of the multi-PUSCH grant are scheduled by a single Downlink Control Information (“DCI”).
5. The method of claim 3 , wherein transmitting the first TB using the second UL grant comprises transmitting in a first non-partial slot of the multi-PUSCH grant for which LBT is successful.
6. The method of claim 1 , wherein the transport block size of the first UL grant and the second UL grant are the same.
7. The method of claim 1 , wherein the first and the second UL grant are allocating resources for a new transmission.
8. The method of claim 1 , wherein the first UL grant is mapped to a first HARQ process and the second UL grant is mapped to a second HARQ process different than the first HARQ process.
9. The method of claim 1 , further comprising storing the second TB in the transmission buffer of the first HARQ process in response to transmitting the first TB during the second UL grant.
10. The method of claim 1 , wherein the remote unit is configured with an autonomous UL (“AUL”) grant, wherein the first UL grant comprises a first AUL opportunity of the AUL grant and the second UL grant comprises a second AUL opportunity of the AUL grant.
11. The method of claim 1 , wherein transmitting the first TB using the second UL grant associated with the second HARQ process occurs in response to the first TB containing higher priority data than the second TB.
12. The method of claim 11 , further comprising:
receiving an indication from a RAN node to modify Logical Channel Prioritization (“LCP”) rules, wherein high priority data is excluded from the first TB in response to modifying the LCP rules; and
transmitting the second TB using the second UL grant in response to the first TB not containing high priority data and also in response to the second LBT procedure resulting in LBT success.
13. The method of claim 1 , further comprising:
receiving Downlink Control Information (“DCI”) indicating a multiple Physical Uplink Shared Channel (“multi-PUSCH”) grant for the remote unit;
determining whether to modify Logical Channel Prioritization (“LCP”) rules for a predetermined number of UL resources of the multi-PUSCH grant; and
generating a TB for a first of the predetermined number of UL resources of the multi-PUSCH grant according to applicable LCP rules.
14. The method of claim 13 , wherein the DCI includes a one-bit flag indicating whether to modify the LCP rules.
15. The method of claim 13 , wherein generating the TB comprises restricting the TB to data from specific LCHs in the predetermined number of UL resources of the multi-PUSCH grant.
16. The method of claim 13 , wherein generating the TB comprises allowing only data from delay tolerant LCHs in the predetermined number of UL resources of the multi-PUSCH grant.
17. The method of claim 13 , wherein the predetermined number of UL resources are located at the beginning of the multi-PUSCH grant.
18. An apparatus comprising:
a processor that:
performs a first listen-before-talk (“LBT”) procedure for transmission of a first transport block (“TB”) associated with a first uplink (“UL”) grant using a first Hybrid Automatic Repeat Request (“HARQ”) process, wherein the first TB is stored in a transmission buffer of the first HARQ process and wherein the first LBT procedure results in LBT failure;
performs a second LBT procedure for transmission of a second TB associated with a second UL grant using a second HARQ process; and
a transceiver that transmits the first TB using the second UL grant associated with the second HARQ process in response to the second LBT procedure resulting in LBT success.
19. The apparatus of claim 18 , wherein the transport block size of the first UL grant and the second UL grant are the same.
20. The apparatus of claim 18 , wherein the first and the second UL grant are allocating resources for a new transmission.