Quasi-colocation prioritization for secondary cell group change with different numerology or asynchronization
Aspects are provided which allow a first wireless device such as a UE or base station to prioritize beams which are simultaneously received from or transmitted to cells of different numerologies or which are asynchronous to each other. The device determines an overlap in time between a first signal from a first cell and a second signal from a second cell, where the second cell includes at least one of a different numerology than the first cell or an asynchronous timing relative to the first cell. The device applies a beam prioritization rule for selecting a beam associated with the first signal or the second signal carrying information in separate beams. The device transmits information to or receives information from a second wireless device based on the selected beam. Thus, simultaneous beam conflict resolution may be improved for cells having different numerologies or asynchronous timing.
1. A method for wireless communication at a first wireless device, comprising:
determining an overlap in time that would occur between a first signal on a first beam with the first wireless device for a first cell and a second signal on a second beam with the first wireless device for a second cell, wherein the second cell includes a different numerology than the first cell;
applying a restriction of the first wireless device from being simultaneously connected to the first cell and the second cell, in response to the different numerology of the first cell and the second cell for which the overlap in time that would occur is identified, wherein the restriction is based on a beam prioritization rule that restricts the first wireless device from being simultaneously connected to the first cell and the second cell due to the different numerology, and wherein the beam prioritization rule is for selecting a beam associated with the first signal of the first cell or the second signal of the second cell carrying information for the first wireless device in separate beams; and
transmitting the information to a second wireless device or receiving the information from the second wireless device based on the selected beam.
2. The method of claim 1 , wherein the restriction is applied during each symbol or at each symbol boundary of one of the first cell or the second cell, and wherein the one of the first cell or the second cell comprises:
a target cell,
a source cell,
the one of the first cell or the second cell having a longer symbol duration,
the one of the first cell or the second cell having a shorter symbol duration, or
a cell identified from one of a radio resource control (RRC) message or a medium access control (MAC) control element (MAC-CE).
3. The method of claim 1 ,
wherein the restriction is applied during a symbol of one of the first cell or the second cell.
4. The method of claim 1 , wherein the restriction is applied per symbol of one of the first cell or the second cell, and wherein the beam with a determined higher priority at a start of each symbol is used for the transmitting or the receiving during each symbol.
5. The method of claim 1 ,
wherein the second cell is asynchronous to the first cell; and
wherein the restriction is applied at a symbol boundary of one of the first cell or the second cell.
6. The method of claim 5 , wherein the one of the first cell or the second cell comprises a cell associated with a current downlink or uplink communication.
7. The method of claim 1 , wherein the restriction is applied per symbol boundary of one of the first cell or the second cell having a longer symbol duration, wherein the beam for the other of the first cell or the second cell includes higher priority at each shorter symbol boundary within the longer symbol duration, and wherein the beam for the other of the first cell or the second cell is used for the transmitting or the receiving at each shorter symbol boundary within the longer symbol duration.
8. The method of claim 1 , wherein the restriction is applied for at least one of:
simultaneous physical downlink control channel (PDCCH) beams,
default physical downlink shared channel (PDSCH) beams,
downlink channel beams including first reference signals,
uplink channel beams including second reference signals,
beams from the first cell and the second cell, or
beams to the first cell and the second cell.
9. The method of claim 1 , further comprising:
transmitting, to the second wireless device, a timing difference between the first cell and the second cell, wherein the timing difference is for downlink communication or uplink communication.
10. The method of claim 1 , further comprising:
receiving a continuous transmission having a same beam indication for the one of the first cell or the second cell, wherein the restriction is applied after the continuous transmission is received.
11. The method of claim 10 , wherein the continuous transmission comprises at least one of:
a control resource set (CORESET) or synchronization signal block (SSB) with a potential physical downlink control channel (PDCCH) transmission,
a downlink signal associated with a decoded transmission configuration index (TCI) state, or
an uplink signal associated with a decoded spatial relation for the uplink signal.
12. An apparatus for wireless communication at a first wireless device, comprising:
at least one memory; and
at least one processor coupled to the at least one memory and configured to:
determine an overlap in time that would occur between a first signal one a first beam with the first wireless device for a first cell and a second signal on a second beam with the first wireless device for a second cell, wherein the second cell includes a different numerology than the first cell;
apply a restriction of the first wireless device from being simultaneously connected to the first cell and the second cell, in response to the different numerology of the first cell and the second cell for which the overlap in time that would occur is identified, wherein the restriction is based on a beam prioritization rule that restricts the first wireless device from being simultaneously connected to the first cell and the second cell due to the different numerology, and wherein the beam prioritization rule is for selecting a beam associated with the first signal of the first cell or the second signal of the second cell carrying information for the first wireless device in separate beams; and
transmit the information to a second wireless device or receive the information from the second wireless device based on the selected beam.
13. The apparatus of claim 12 , wherein the restriction is applied during each symbol or at each symbol boundary of one of the first cell or the second cell, and wherein the one of the first cell or the second cell comprises:
a target cell,
a source cell,
the one of the first cell or the second cell having a longer symbol duration,
the one of the first cell or the second cell having a shorter symbol duration, or
a cell identified from one of a radio resource control (RRC) message or a medium access control (MAC) control element (MAC-CE).
14. The apparatus of claim 12 ,
wherein the restriction is applied during a symbol of one of the first cell or the second cell.
15. The apparatus of claim 12 ,
wherein the second cell is asynchronous to the first cell; and
wherein the restriction is applied at a symbol boundary of one of the first cell or the second cell.
16. The apparatus of claim 15 , wherein the one of the first cell or the second cell comprises a cell associated with a current downlink or uplink communication.
17. The apparatus of claim 12 , wherein the restriction is applied for at least one of:
simultaneous physical downlink control channel (PDCCH) beams,
default physical downlink shared channel (PDSCH) beams,
downlink channel beams including first reference signals,
uplink channel beams including second reference signals,
beams from the first cell and the second cell, or
beams to the first cell and the second cell.
18. The apparatus of claim 12 , wherein the at least one processor is further configured to:
transmit, to the second wireless device, a timing difference between the first cell and the second cell, wherein the timing difference is for downlink communication or uplink communication.
19. The apparatus of claim 12 , wherein the at least one processor is further configured to receive a continuous transmission having a same beam indication for the one of the first cell or the second cell, wherein the restriction is applied after the continuous transmission is received.
20. The apparatus of claim 19 , wherein the continuous transmission comprises at least one of:
a control resource set (CORESET) or synchronization signal block (SSB) with a potential physical downlink control channel (PDCCH) transmission,
a downlink signal associated with a decoded transmission configuration index (TCI) state, or
an uplink signal associated with a decoded spatial relation for the uplink signal.
21. An apparatus for wireless communication at a first wireless device, comprising:
means for determining an overlap in time that would occur between a first signal on a first beam with the first wireless device for a first cell and a second signal on a second beam with the first wireless device for a second cell, wherein the second cell includes a different numerology than the first cell;
means for applying a restriction of the first wireless device from being simultaneously connected to the first cell and the second cell, in response to the different numerology of the first cell and the second cell for which the overlap in time that would occur is identified, wherein the restriction is based on a beam prioritization rule that restricts the first wireless device from being simultaneously connected to the first cell and the second cell due to the different numerology, and wherein the beam prioritization rule is for selecting a beam associated with the first signal of the first cell or the second signal of the second cell carrying information for the first wireless device in separate beams; and
means for transmitting the information to a second wireless device, or means for receiving the information from the second wireless device, based on the selected beam.
22. The apparatus of claim 21 , wherein the means for transmitting is further configured to transmit, to the second wireless device, a timing difference between the first cell and the second cell, wherein the timing difference is for downlink communication or uplink communication.
23. A non-transitory computer-readable medium storing computer executable code for wireless communication at a first wireless device, the code when executed by a processor cause the processor to:
determine an overlap in time that would occur between a first signal on a first beam with the first wireless device for a first cell and a second signal on a second beam with the first wireless device for a second cell, wherein the second cell includes a different numerology than the first cell;
apply a restriction of the first wireless device from being simultaneously connected to the first cell and the second cell, in response to the different numerology of the first cell and the second cell for which the overlap in time that would occur is identified, wherein the restriction is based on a beam prioritization rule that restricts the first wireless device from being simultaneously connected to the first cell and the second cell due to the different numerology, and wherein the beam prioritization rule is for selecting a beam associated with the first signal of the first cell or the second signal of the second cell carrying information for the first wireless device in separate beams; and
transmit the information to a second wireless device or receive the information from the second wireless device based on the selected beam.