In-band SPS Skipping Indication for UE Power Saving
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Solution Overview
Problem
In wireless communication systems, user equipment (UE) experiences power inefficiency due to the need to continuously monitor and potentially decode empty semi-persistent scheduling (SPS) occasions, leading to prolonged active power states even after data bursts have ended, as current methods lack an efficient mechanism to indicate skipped SPS occasions.
Innovation Solution
The implementation of an in-band SPS skipping indication transmitted via the physical downlink shared channel (PDSCH), using media access control (MAC) control elements or cyclic redundancy check (CRC) scrambling, allows UE to skip future SPS occasions, enabling power savings by informing the UE of upcoming skipped occasions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If UE continuously monitors SPS occasions to ensure data reception, then data reception reliability is improved, but power consumption increases
Solution Approach 1:
The network device performs preliminary action by transmitting skipping indications in advance through PDSCH before the actual SPS occasion occurs. This allows the UE to prepare for power saving by knowing ahead of time that a particular SPS occasion will be skipped, enabling the UE to transition to low power state before the scheduled transmission time.
Solution Approach 2:
The system implements feedback mechanism where the network device provides skipping indications to the UE through PDSCH. This feedback loop allows the UE to adjust its monitoring behavior based on actual network transmission decisions, improving power efficiency while maintaining reliable data reception when needed.
2Reliability
If UE monitors all SPS occasions including empty ones, then communication reliability is improved, but active power state duration increases
Solution Approach 1:
The network device transmits skipping indications through PDSCH in advance, allowing the UE to transition to low power state before the actual SPS occasion. This preliminary notification mechanism reduces the duration of active power state by enabling early power saving while maintaining communication reliability through proper scheduling.
Solution Approach 2:
The system extracts unnecessary monitoring by removing empty SPS occasions from the UE's monitoring list. Through skipping indications, the network identifies and removes SPS occasions that will not carry data, allowing the UE to exclude these from monitoring and thereby reduce active power state duration.
3Reliability
If UE decodes all SPS occasions to check for data, then data reception completeness is improved, but processing time and power consumption increase
Solution Approach 1:
The network device provides skipping indications through PDSCH before the SPS occasion, allowing the UE to prepare for power saving by knowing ahead of time that a particular SPS occasion will be skipped. This preliminary notification enables the UE to skip decoding entirely for indicated occasions, reducing processing time while maintaining data reception completeness for actual data transmissions.
Solution Approach 2:
The system extracts unnecessary decoding operations by removing skipped SPS occasions from the UE's decoding list. Through skipping indications, the network identifies SPS occasions that will not carry data, allowing the UE to exclude these from decoding processing and thereby reduce processing time and power consumption.
Data Source
AI summary
A method for of wireless communication, by a user equipment (UE) includes receiving an in-band skipping indication on a physical downlink shared channel (PDSCH) during a semi persistent scheduling (SPS) occasion. The method also includes skipping at least one future SPS occasion based on the in-band skipping indication. A method for wireless communication, by a network device includes transmitting, to a user equipment (UE), a semi persistent scheduling (SPS) configuration. The method further includes transmitting, to the UE, an in-band skipping indication on a physical downlink shared channel (PDSCH) during an SPS occasion of the SPS configuration to enable the UE to skip at least one future SPS occasion.