Control messaging for multi-beam communications
Some aspects include an apparatus, method, and computer program product for facilitating control messaging for multi-beam communications in 5G wireless communication systems. Nodes of a 5G network may be generate Medium Access Control Control Elements (MAC CEs) to update User Equipment (UE) with different Component Carrier (CC) settings. The MAC CEs may update a list of CCs to reduce messaging overhead and latency. For example, a MAC CE may indicate an update for a Transmission Configuration Indication (TCI) state for a list of CCs. Similarly, a MAC CE may be used to update a spatial relation for a Sounding Reference Signal (SRS) resource set and/or a SRS resource corresponding to a list of CCs. A MAC CE may also be used to update multiple TCI codepoints having one or two TCI states in a multi-Transmission Reception Point (multi-TRP) scenario.
1. A method, at an access node, comprising:
identifying an update of a Transmission Configuration Indicator (TCI) state corresponding to a Component Carrier (CC) for a User Equipment (UE), wherein the CC has a serving cell ID;
determining that a list of CCs including the CC are to be updated based on the update of the TCI state;
generating a medium access control control element (MAC CE) including the serving cell ID and a bit value directing the UE to update the TCI state for CCs in the list of CCs using the serving cell ID; and
transmitting the MAC CE to the UE,
wherein the bit value modifies a TCI codepoint with multiple TCI states.
2. The method of claim 1 , further comprising:
transmitting a Radio Resource Control (RRC) message to the UE to configure the list of CCs.
3. The method of claim 1 , wherein the bit value is indicated using a reserved bit of the MAC CE.
4. The method of claim 1 , wherein the MAC CE includes TCI state information to update a TCI state for a Physical Downlink Shared Channel (PDSCH).
5. The method of claim 1 , wherein the MAC CE includes CORESET information to update a TCI state for a Physical Downlink Control Channel (PDCCH).
6. The method of claim 1 , wherein the bit value is indicated using a most significant bit (MSB) or a least significant bit (LSB) of a TCI State ID.
7. An access node, comprising:
a processor configured to:
identify a configuration of one or more Transmission Configuration Indicator (TCI) codepoints corresponding to a Component Carrier (CC) of a User Equipment (UE);
determine that at least one of the one or more TCI codepoints has multiple TCI states;
generate a medium access control control element (MAC CE) including a first value indicating an amount of the one or more TCI codepoints and a second value indicating an amount of the at least one of the one or more TCI codepoints having multiple TCI states; and
for the at least one of the one or more TCI codepoints having multiple TCI states, update the MAC CE to include a bit value indicating a presence of multiple TCI states; and
radio front end circuitry, coupled to the processor, transmit the MAC CE to the UE.
8. The access node of claim 7 , wherein the processor is further configured to:
transmit a Radio Resource Control (RRC) message to the UE to configure a list of CCs.
9. The access node of claim 7 , wherein the bit value is indicated using a reserved bit of the MAC CE.
10. The access node of claim 7 , wherein the MAC CE includes TCI state information to update a TCI state for a Physical Downlink Shared Channel (PDSCH).
11. The access node of claim 7 , wherein the MAC CE includes CORESET information to update a TCI state for a Physical Downlink Control Channel (PDCCH).
12. The access node of claim 7 , wherein the bit value is indicated using a most significant bit (MSB) or a least significant bit (LSB) of a TCI State ID.
13. The access node of claim 7 , wherein the bit value modifies a TCI codepoint with multiple TCI states.
14. A non-transitory computer readable medium having instructions stored thereon that, when executed by one or more processors of an access node, causes the access node to perform operations comprising:
identifying an update of a Transmission Configuration Indicator (TCI) state corresponding to a Component Carrier (CC) for a User Equipment (UE), wherein the CC has a serving cell ID;
determining that a list of CCs including the CC are to be updated based on the update of the TCI state;
generating a medium access control control element (MAC CE) including the serving cell ID and a bit value directing the UE to update a TCI state for CCs in the list of CCs using the serving cell ID; and
transmitting the MAC CE to the UE,
wherein the bit value modifies a TCI codepoint with multiple TCI states.
15. The non-transitory computer readable medium of claim 14 , wherein the operations further comprise:
transmitting a Radio Resource Control (RRC) message to the UE to configure the list of CCs.
16. The non-transitory computer readable medium of claim 14 , wherein the bit value is indicated using a most significant bit (MSB) or a least significant bit (LSB) of a TCI State ID.
17. The non-transitory computer readable medium of claim 14 , wherein the bit value is indicated using a reserved bit of the MAC CE.
18. The non-transitory computer readable medium of claim 14 , wherein the MAC CE includes TCI state information to update a TCI state for a Physical Downlink Shared Channel (PDSCH).
19. The non-transitory computer readable medium of claim 14 , wherein the MAC CE includes CORESET information to update a TCI state for a Physical Downlink Control Channel (PDCCH).