Method and apparatus for enhanced physical downlink control channel (PDCCH) monitoring on overlapping PDCCH monitoring occasions
Embodiments of the present application are directed to a method and apparatus for enhanced PDCCH monitoring on overlapping PDCCH monitoring occasions. A method according to an embodiment of the present application may include: receiving configuration information for monitoring a plurality of physical downlink control channel (PDCCH) transmissions, wherein the configuration information includes a plurality of search space sets; selecting at least one search space set with different quasi co-location (QCL)-Type D information from each other for monitoring from the plurality of search space sets based on a rule; and monitoring at least one search space set including the selected at least one search space set on monitoring occasions.
1 . A method performed by a user equipment (UE), the method comprising:
receiving configuration information for monitoring a plurality of physical downlink control channel (PDCCH) transmissions, wherein the configuration information includes a plurality of search space sets;
selecting at least one search space set: with different quasi co-location (QCL)-Type D information from each other, for monitoring from the plurality of search space sets based on a rule, including selecting a search space set associated with one full PDCCH transmission for monitoring on the monitoring occasions,
wherein the full PDCCH transmission indicates a normal PDCCH transmission or multiple transmissions of an enhanced PDCCH (ePDCCH) transmission using a frequency division multiplexed scheme, and
wherein one of the plurality of search space sets for the multiple transmissions of the ePDCCH transmission has a lowest search space set index among search space sets for the multiple transmissions of the ePDCCH transmission and the normal PDCCH transmission; and
monitoring at least one search space set including the selected at least one search space set on monitoring occasions.
2 . The method of claim 1 , wherein monitoring the at least one search space set further comprises: further monitoring at least one search space set with a same QCL-Type D information as the selected at least one search space set on the monitoring occasions.
3 . The method of claim 1 , wherein selecting the at least one search space set for monitoring based on the rule comprises:
selecting a search space set with a first priority from each search space superset of a plurality of search space supersets,
wherein the search space superset includes at least one search space set.
4 . The method of claim 3 , wherein the search space superset is associated with at least one of the following:
a same UE panel;
a same transmission configuration indicator (TCI) information associated with a UE panel;
a same transmit-receive point (TRP); or
a same control resource set (CORESET) pool index.
5 . The method of claim 3 , wherein a number of the plurality of search space supersets is equal to at least one of the following:
a number of UE panels;
a number of transmission configuration indicator (TCI) information associated with UE panels;
a number of transmission-receive points (TRPs); or
a number of control resource set (CORESET) pool indexes.
6 . The method of claim 3 , wherein selecting the search space set with the first priority from each search space superset comprises: selecting the search space set with the first priority based on at least one of the following:
a type of search space;
an index of search space; or
an index of cell.
7 . The method of claim 6 , wherein selecting the search space set with the first priority from each search space superset further comprises:
selecting a common search space (CSS) set with a lowest index in a cell with a lowest index containing a CSS set; and
selecting a UE specific search space (USS) set with a lowest index in the cell with the lowest index in the case that there is no CSS set in the search space superset.
8 . The method of claim 7 , wherein selecting the search space set with the first priority from each search space superset further comprises:
when there is no allocated PDCCH candidates in the search space set with the first priority, selecting a USS set with a second priority from the search space superset.
9 . The method of claim 1 ,
wherein the full PDCCH transmission indicates the normal PDCCH transmission with one transmission of a downlink control information (DCI) or multiple transmissions of the ePDCCH transmission with multiple transmissions of the DCI.
10 . The method of claim 1 , wherein selecting the at least one search space set associated with one full PDCCH transmission for monitoring on the monitoring occasions comprises:
when a time-division multiplexed based ePDCCH transmission scheme is used and a first search space set for a first transmission for the ePDCCH transmission is monitored on a previous monitoring occasion, selecting a second search space set for a second transmission for the ePDCCH transmission on a current monitoring occasion by giving the second search space set for the second transmission for the ePDCCH transmission a priority higher than that of a search space set for the normal PDCCH transmission.
11 . The method of claim 1 , wherein selecting the at least one search space set associated with one full PDCCH transmission for monitoring on the monitoring occasions comprises:
when a time-division multiplexed based ePDCCH transmission scheme is used and a first search space set for a first transmission for the ePDCCH transmission is not monitored on a previous monitoring occasion, selecting a search space set for a normal PDCCH transmission rather than a second search space set for a second transmission for the ePDCCH transmission on a current monitoring occasion by giving a search space set for the normal PDCCH transmission a priority higher than that of the second search space set for the second transmission for the ePDCCH transmission.
12 . The method of claim 1 , wherein a number of the selected at least one search space set depends on a capability of the UE.
13 . A user equipment (UE) for wireless communication, comprising:
at least one memory; and
at least one processor coupled with the at least one memory and configured to cause the UE to:
receive configuration information for monitoring a plurality of physical downlink control channel (PDCCH) transmissions, wherein the configuration information includes a plurality of search space sets;
select at least one search space set with different quasi co-location (QCL)-Type D information from each other for monitoring from the plurality of search space sets based on a rule, including selecting a search space set associated with one full PDCCH transmission for monitoring on the monitoring occasions,
wherein the full PDCCH transmission indicates a normal PDCCH transmission or multiple transmissions of an enhanced PDCCH (ePDCCH) transmission using a frequency division multiplexed scheme, and
wherein one of the plurality of search space sets for the multiple transmissions of the ePDCCH transmission has a lowest search space set index among search space sets for the multiple transmissions of the ePDCCH transmission and the normal PDCCH transmission; and
monitor at least one search space set including the selected at least one search space set on monitoring occasions.
14 . The UE of claim 13 , wherein, to monitor the at least one search space set, the at least one processor is configured to cause the UE to: further monitor at least one search space set with a same QCL-Type D information as the selected at least one search space set on the monitoring occasions.
15 . The UE of claim 13 ,
wherein the full PDCCH transmission indicates the normal PDCCH transmission with one transmission of a downlink control information (DCI) or multiple transmissions of the ePDCCH transmission with multiple transmissions of the DCI.
16 . The UE of claim 13 , wherein a number of the selected at least one search space set depends on a capability of the UE.
17 . The UE of claim 13 , wherein, to select the at least one search space set for monitoring based on the rule, the at least one processor is configured to cause the UE to:
select a search space set with a first priority from each search space superset of a plurality of search space supersets,
wherein the search space superset includes at least one search space set.
18 . The UE of claim 17 , wherein the search space superset is associated with at least one of the following:
a same UE panel;
a same transmission configuration indicator (TCI) information associated with a UE panel;
a same transmit-receive point (TRP); or
a same control resource set (CORESET) pool index.
19 . The UE of claim 17 , wherein a number of the plurality of search space supersets is equal to at least one of the following:
a number of UE panels;
a number of transmission configuration indicator (TCI) information associated with UE panels;
a number of transmission-receive points (TRPs); or
a number of control resource set (CORESET) pool indexes.
20 . The UE of claim 17 , wherein, to select the search space set with the first priority from each search space superset comprises, the at least one processor is configured to cause the UE to select the search space set with the first priority based on at least one of the following:
a type of search space;
an index of search space; or
an index of cell.