Uplink control and data transmission in multiflow-enabled networks
Signaling and procedural considerations are disclosed for uplink multiflow operations in user equipment configured for carrier aggregation. Advanced wireless networks may take advantage of unused capacity of neighboring cells by configuring network nodes and UEs to both receive on the downlink and transmit on the uplink to multiple cells or network nodes. Implementing multiflow on UE for the uplink transmission process may cause issues in various channels, signaling, and procedural operations that may be addressed through data and control signaling the techniques disclosed herein.
1. A method of wireless communication, comprising:
reporting, by a user equipment (UE), a multiple uplink capability of the UE;
receiving a configuration for the UE to perform multiflow uplink transmission for two or more nodes belonging to two or more timing adjustment groups (TAGs) wherein each of the two or more nodes belongs to a separate one of the two or more TAGs; and
transmitting, by the UE, at least two physical uplink control channels (PUCCHs) to at least two nodes of the two or more nodes, wherein each of the at least two PUCCHs is generated for a corresponding one of the at least two nodes.
2. A user equipment (UE) configured for wireless communication, comprising:
means for reporting a multiple uplink capability of the UE;
means for receiving a configuration for the UE to perform multiflow uplink transmission for two or more nodes belonging to two or more timing adjustment groups (TAGs) wherein each of the two or more nodes belongs to a separate one of the two or more TAGs; and
means for transmitting, by the UE, at least two physical uplink control channels (PUCCHs) to at least two nodes of the two or more nodes, wherein each of the at least two PUCCHs is generated for a corresponding one of the at least two nodes.
3. A computer program product for wireless communications in a wireless network, comprising:
a non-transitory computer-readable medium having program code recorded thereon, the program code including:
program code for causing a user equipment (UE) to report a multiple uplink capability of the UE;
program code for causing the UE to perform multiflow uplink transmission for two or more nodes belonging to two or more timing adjustment groups (TAGs) wherein each of the two or more nodes belongs to a separate one of the two or more TAGs; and
program code for causing the UE to transmit at least two physical uplink control channels (PUCCHs) to at least two nodes of the two or more nodes, wherein each of the at least two PUCCHs is generated for a corresponding one of the at least two nodes.
4. An apparatus configured for wireless communication, the apparatus comprising:
at least one processor; and
a memory coupled to the at least one processor,
wherein the at least one processor is configured:
to report, by the apparatus, a multiple uplink capability of the apparatus;
to receive a configuration for the apparatus to perform multiflow uplink transmission for two or more nodes belonging to two or more timing adjustment groups (TAGs) wherein each of the two or more nodes belongs to a separate one of the two or more TAGs; and
to transmit, by the apparatus, at least two physical uplink control channels (PUCCHs) to at least two nodes of the two or more nodes, wherein each of the at least two PUCCHs is generated for a corresponding one of the at least two nodes.
5. The method of claim 1 , wherein at least one node of the at least two nodes of the two or more nodes is a secondary cell.
6. The apparatus of claim 2 , wherein at least one node of the at least two nodes of the two or more nodes is a secondary cell.
7. The computer program product of claim 3 , wherein at least one node of the at least two nodes of the two or more nodes is a secondary cell.
8. The apparatus of claim 4 , wherein at least one node of the at least two nodes of the two or more nodes is a secondary cell.
9. The method of claim 1 , wherein the multiple uplink capability of the UE corresponds to a capability of the UE to tune to different transmission frequencies simultaneously.
10. The method of claim 1 , wherein the at least two nodes of the two or more nodes include a booster or secondary node.
11. The method of claim 10 , wherein the UE performs PUCCH transmission to the booster or secondary node according to a transmit power control command received from the booster or secondary node.
12. The method of claim 1 , further comprising prioritizing a PUCCH transmission targeted to an anchor node in response to determining that maximum available power of the UE is not sufficient to transmit all of the at least two PUCCH transmissions.
13. The method of claim 1 , further comprising scaling transmission power across PUCCH transmissions in response to determining that maximum available power of the UE is not sufficient to transmit all of the at least two PUCCH transmissions.
14. The UE of claim 2 , wherein the multiple uplink capability of the UE corresponds to a capability of the UE to tune to different transmission frequencies simultaneously.
15. The UE of claim 2 , wherein the at least two nodes of the two or more nodes include a booster or secondary node.
16. The UE of claim 15 , wherein the UE performs PUCCH transmission to the booster or secondary node according to a transmit power control command received from the booster or secondary node.
17. The UE of claim 2 , further comprising means for prioritizing a PUCCH transmission targeted to an anchor node in response to determining that maximum available power of the UE is not sufficient to transmit all of the at least two PUCCH transmissions.
18. The UE of claim 2 , further comprising means for scaling transmission power across PUCCH transmissions in response to determining that maximum available power of the UE is not sufficient to transmit all of the at least two PUCCH transmissions.
19. The computer program product of claim 3 , wherein the multiple uplink capability of the UE corresponds to a capability of the UE to tune to different transmission frequencies simultaneously.
20. The computer program product of claim 3 , wherein the at least two nodes of the two or more nodes include a booster or secondary node.
21. The computer program product of claim 20 , wherein the program code further includes program code for performing PUCCH transmission to the booster or secondary node according to a transmit power control command received from the booster or secondary node.
22. The computer program product of claim 3 , wherein the program code further includes program code for prioritizing a PUCCH transmission targeted to an anchor node in response to determining that maximum available power of the UE is not sufficient to transmit all of the at least two PUCCH transmissions.
23. The computer program product of claim 3 , wherein the program code further includes program code for scaling transmission power across PUCCH transmissions in response to determining that maximum available power of the UE is not sufficient to transmit all of the at least two PUCCH transmissions.
24. The apparatus of claim 4 , wherein the multiple uplink capability of the apparatus corresponds to a capability of the apparatus to tune to different transmission frequencies simultaneously.
25. The apparatus of claim 4 , wherein the at least two nodes of the two or more nodes include a booster or secondary node.
26. The apparatus of claim 25 , wherein the apparatus performs PUCCH transmission to the booster or secondary node according to a transmit power control command received from the booster or secondary node.
27. The apparatus of claim 4 , wherein the at least one processor is further configured to prioritize a PUCCH transmission targeted to an anchor node in response to determining that maximum available power of the apparatus is not sufficient to transmit all of the at least two PUCCH transmissions.
28. The apparatus of claim 4 , wherein the at least one processor is further configured to scale transmission power across PUCCH transmissions in response to determining that maximum available power of the apparatus is not sufficient to transmit all of the at least two PUCCH transmissions.