Methods and apparatus for efficient power saving in wireless networks
Methods and apparatus for power saving in a wireless network are disclosed. A Wireless Transmit/Receive Unit (WTRU) may comprise a transmitter, a receiver, and a processor. The processor may determine a processing state pertaining to behavior of the WTRU and determine a minimum amount of resources to be processed for one or more sets of physical resources based on the determined processing state. Each respective set of physical resources may comprise resources in time, and any of frequency or space. For each respective set of physical resources, the time may comprise a frame structure associated with a numerology applicable to the respective set of physical resources, the frequency may comprise any of a frequency location, a bandwidth, or the numerology, and the space may comprise one or more beams. The processor may process the determined minimum amount of resources of the one of more sets of physical resources.
1. A Wireless Transmit/Receive Unit (WTRU), comprising a transceiver and a processor which are configured to:
receive configuration information identifying groups of search spaces associated with a control resource set;
monitor, according to the configuration information, a first group of the search spaces for a first physical downlink control channel (PDCCH) transmission;
receive the first PDCCH transmission via the monitored first group of the search spaces, the first PDCCH transmission including downlink control information (DCI), the DCI including information indicating an index associated with a second group of the search spaces for monitoring by the WTRU for a second PDCCH transmission; and
monitor, the second group of the search spaces for the second PDCCH transmission, wherein the transceiver and the processor are configured to monitor only one of the first and second groups of the search spaces at a time.
2. The WTRU of claim 1 , wherein the configuration information identifying the groups of the search spaces associated with the control resource set is included in a Radio Resource Control (RRC) message.
3. The WTRU of claim 1 , wherein the transceiver and the processor are configured to monitor the first group of the search spaces for the first PDCCH transmission using any of: (1) the control resource set, or (2) a type of signaling structure.
4. The WTRU of claim 1 , wherein the control resource set comprises any of: one or more control channel elements, one or more of the search spaces, and one or more aggregation levels.
5. The WTRU of claim 1 , wherein the transceiver and the processor are configured to associate: (1) the monitoring of the first group of the search spaces with a first configuration for a data channel, and (2) the second group of the search spaces with a second configuration for the data channel, the second configuration being different than the first configuration.
6. The WTRU of claim 1 , wherein the DCI includes information indicating a resource assignment associated with the second group of the search spaces, and
wherein the transceiver and the processor are configured to decode the second PDCCH transmission using the received resource assignment.
7. A method performed by a Wireless Transmit/Receive Unit (WTRU), the method comprising:
receiving configuration information identifying groups of search spaces associated with a control resource set;
monitoring, according to the configuration information, a first group of the search spaces for a first physical downlink control channel (PDCCH) transmission;
receiving the first PDCCH transmission via the monitored first group of the search spaces, the first PDCCH transmission including downlink control information (DCI), the DCI including information indicating an index associated with a second group of the search spaces for monitoring by the WTRU for a second PDCCH transmission; and
monitoring the second group of the search spaces for the second PDCCH transmission,
wherein the WTRU monitors only one of the first and second groups of the search spaces at a time.
8. The method of claim 7 , wherein the configuration information identifying the groups of the search spaces associated with the control resource set is included in a Radio Resource Control (RRC) message.
9. The method of claim 7 , wherein the monitoring of the first group of the search spaces for the first PDCCH transmission using any of: (1) the control resource set or (2) a type of signaling structure.
10. The method of claim 7 , wherein the control resource set comprises any of: one or more control channel elements, one or more of the search spaces, or one or more aggregation levels.
11. The WTRU of claim 1 , wherein the transceiver and the processor are configured to receive the second PDCCH transmission via the monitored second group of the search spaces.
12. The method of claim 7 , further comprising:
receiving the second PDCCH transmission via the monitored second group of search spaces.
13. The method of claim 7 , further comprising:
associating (1) the monitoring of the first group of the search spaces with a first configuration for a data channel, and (2) the second group of the search spaces with a second configuration for the data channel, the second configuration being different than the first configuration.
14. The method of claim 7 , further comprising:
decoding the second PDCCH transmission using a resource assignment associated with the second group of the search spaces,
wherein the DCI includes information indicating the resource assignment.
15. The WTRU of claim 1 , wherein the DCI includes information indicating at least one of:
a predefined time at which to transition to the monitoring of the second group of the search spaces,
configuration parameters defining any of a set of actions or behavior associated with the second group of the search spaces, and
a time difference between a time at which the DCI is received and a time at which to transition to the monitoring of the second group of the search spaces.
16. The WTRU of claim 1 , wherein the transceiver and the processor are configured to switch to monitor the second group of the search spaces for the second PDCCH transmission based on a time at which the DCI is received.
17. The WTRU of claim 1 , wherein the transceiver and the processor are configured to switch from monitoring the first group of search spaces to monitoring the second group of the search spaces for the second PDCCH transmission based on a predefined or statically defined time from when the DCI is received.
18. The method of claim 7 , wherein the DCI includes information indicating at least one of:
a predefined time at which to transition to the monitoring of the second group of the search spaces,
configuration parameters defining any of a set of actions or behavior associated with the second group of the search spaces, and
a time difference between a time at which the DCI is received and a time at which to transition to the monitoring of the second group of the search spaces.
19. The method of claim 7 , further comprising:
switching to monitoring the second group of the search spaces for the second PDCCH transmission based on a time at which the DCI is received.
20. The method of claim 7 , further comprising:
switching from monitoring the first group of the search spaces to monitoring the second group of the search spaces for the second PDCCH transmission based on a predefined or statically defined time from when the DCI is received.