US 12,408,156 B2
Switching monitoring between search space groups
Navin Hathiramani, Coppell, TX (US); and Karol Schober, Helsinki (FI)
Assigned to NOKIA TECHNOLOGIES OY, Espoo (FI)
Appl. No. 18/040,732
Filed by Nokia Technologies Oy, Espoo (FI)
PCT Filed Jul. 23, 2021, PCT No. PCT/EP2021/070676
§ 371(c)(1), (2) Date Feb. 6, 2023,
PCT Pub. No. WO2022/033838, PCT Pub. Date Feb. 17, 2022.
Claims priority of provisional application 62/706,415, filed on Aug. 14, 2020.
Prior Publication US 2023/0319801 A1, Oct. 5, 2023
Int. Cl. H04W 72/0453 (2023.01); H04W 72/23 (2023.01); H04B 17/309 (2015.01); H04L 5/00 (2006.01)
CPC H04W 72/0453 (2013.01) [H04W 72/23 (2023.01); H04B 17/309 (2015.01); H04L 5/0053 (2013.01)] 1 Claim
OG exemplary drawing
 
1. An apparatus comprising:
at least one processor; and
at least one memory including instructions,
wherein the apparatus is in a radio resource control (RRC) connected state,
wherein the apparatus is configured with carrier aggregation, and
wherein the at least one memory including the instructions is configured to, with the at least one processor, cause the apparatus at least to:
establish a slot-based time grid using a subcarrier spacing of at least one of a primary cell or one or more secondary cells;
receive, via RRC signaling, configuration information configuring one or more search space groups for the primary cell and the one or more secondary cells, the one or more search space groups including at least a first search space group and at least a second search space group, wherein each of the primary cell and the one or more secondary cells are configured with corresponding search space monitoring patterns and associated priorities, wherein the search space monitoring patterns include physical downlink control channel monitoring occasions, and wherein the search space monitoring patterns are mapped to the slot-based time grid;
monitor at least the first search space group on a secondary cell configured for scheduling the primary cell, wherein the monitoring is performed such that blind decoding and control channel element limits are not exceeded;
detect whether a condition to switch from the first search space group to the second search space group is satisfied, wherein the condition includes:
detecting neither of a pre-defined signal nor a channel on a scheduling cell during a measurement occasion of the scheduling cell;
determining whether a channel quality indicator is below a threshold value during a measurement occasion of the scheduling cell;
detecting a radio link failure of a physical downlink control channel during a measurement occasion of another scheduling cell; and
detecting that a network node is not transmitting due to a Listen Before Talk (LBT) failure;
switch the monitoring from the at least first search space group to the second search space group in response to the detecting that the condition is satisfied; and
determine the secondary cell as a scheduling cell to be used for the monitoring based at least on associated priorities of the primary cell and the one or more secondary cells.