Systems and methods for updating active TCI state for multi-PDCCH based multi-TRP
Systems and methods for updating an active Transmission Configuration Indicator (TCI) state for multi-Physical Downlink Control Channel (PDCCH) based Multi-Transmission Reception Point (TRP) are provided. In some embodiments, a method performed by a wireless device for receiving one or more, TCI states includes: receiving a TCI state for at least one Control Resource Set (CORESET) using a control message comprising seven or more bits of TCI State ID field. In this way, the control message can be used to receive additional TCI states. In some embodiments, this allows the physical cell ID to be added to the TCI state.
1 . A method performed by a wireless device for receiving one or more Transmission Configuration Indicator, TCI, states, the method comprising:
receiving a TCI state for at least one Control Resource Set, CORESET, using a control message comprising a TCI State Identification, ID, field, wherein the TCI State ID field is at least eight bits; and
updating the TCI state for the at least one CORESET;
wherein the control message is a Medium Access Control, (MAC), Control Element, (CE); wherein the MAC CE control message comprises three octets, wherein the TCI State ID is provided in a third octet of the control message.
2 . The method of claim 1 wherein the control message further comprises a CORESET ID, where the CORESET ID indicated in the control message with value m is reinterpreted as an m th CORESET within a CORESET group as configured in Radio Resource Control, RRC.
3 . The method of claim 1 wherein the CORESET group is known to the wireless device as the group of the CORESET that carries a Physical Downlink Control Channel, PDCCH, which is used to schedule a Physical Downlink Shared Channel, PDSCH, carrying the TCI state indication control message.
4 . The method of claim 1 wherein a CORESET ID field comprises one of the group consisting of: four bits; and five or more bits.
5 . The method of claim 4 wherein a maximum number of CORESETs per serving cell is limited via wireless device capability signaling.
6 . The method of claim 1 further comprising:
reporting, to a network node, a capability signaling on a maximum number of CORESETs per Bandwidth part, BWP and/or per ‘PDCCH-config’.
7 . The method of claim 6 wherein reporting the capability signaling further comprises indicating a maximum number of CORESETs per ‘PDCCH-config’ as well as a corresponding number of Bandwidth Parts, BWPs.
8 . The method of claim 1 further comprising:
receiving a configuration with multiple CORESETs per serving cell taking into account one or more lists of TCI states.
9 . The method of claim 8 wherein receiving the configuration with multiple CORESETs per serving cell further comprises receiving the configuration with multiple CORESETs per serving cell taking into account the reported capability signaling and the one or more lists of TCI states.
10 . The method of claim 1 further comprising:
receiving a configuration with a higher layer index per CORESET used for forming one or more CORESET groups.
11 . The method of claim 1 wherein the wireless device is configured to receive multiple PDCCHs in a given slot.
12 . The method of claim 1 wherein the maximum number of CORESETs per Bandwidth Part, BWP, and/or per “PDCCH-config” is five or more.
13 . A method performed by a base station for determining one or more Transmission Configuration Indicator, TCI, states, the method comprising:
transmitting, to a wireless device, an indication of a TCI state for at least one Control Resource Set, CORESET, using a control message comprising a TCI State Identification, ID, field, wherein the TCI State ID field is at least eight bits, wherein the control message is a Medium Access Control, (MAC), Control Element, (CE); wherein the MAC CE control message comprises three octets, and wherein the TCI State ID is provided in a third octet of the control message.
14 . A wireless device for receiving one or more Transmission Configuration Indicator, TCI, states, the wireless device comprising:
one or more processors; and
memory storing instructions executable by the one or more processors, whereby the wireless device is operable to:
receive a TCI state for at least one Control Resource Set, CORESET, using a control message comprising a TCI State Identification, ID, field, wherein the TCI State ID field is at least eight bits, wherein the control message is a Medium Access Control, (MAC), Control Element, (CE), wherein the MAC CE control message comprises three octets, and wherein the TCI State ID is provided in a third octet of the control message.
15 . A base station for transmitting one or more Transmission Configuration Indicator, TCI, states, the base station comprising:
one or more processors; and
memory comprising instructions to cause the base station to:
transmit, to a wireless device, an indication of a TCI state for at least one Control Resource Set, CORESET, using a control message comprising a TCI State Identification ID field, wherein the TCI State ID field is at least eight bits, wherein the control message is a Medium Access Control, (MAC), Control Element, (CE), wherein the MAC CE control message comprises three octets, and wherein the TCI State ID is provided in a third octet of the control message.