Sidelink UE Power Saving via SCI Decoding
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Solution Overview
Problem
Wireless communication systems face inefficiencies in power management during sidelink communications, particularly in high temperature conditions where devices continue to use high power for baseband processing even when no data packets are present, leading to potential hardware damage and increased power consumption.
Innovation Solution
A user equipment (UE) receives sidelink control information (SCI) and, upon unsuccessful decoding, disables radio frequency (RF) components for the remaining time slot symbols, reducing power consumption and preventing damage by constraining SCI to a subset of time slot symbols and using RSSI, RSRP, or DMRS correlation to determine successful decoding.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the UE continues to process baseband signals during sidelink communication suspension, then the processing capability is maintained, but power consumption increases and hardware may be damaged
Solution Approach 1:
The UE performs preliminary decoding of the SCI in the first set of symbols to determine whether sidelink communication is suspended before committing to full baseband processing. This preliminary action allows the system to avoid unnecessary power consumption while maintaining hardware reliability by making an early decision about whether to proceed with full processing.
Solution Approach 2:
The time slot is segmented into a first set of symbols for control channel decoding and a second set of symbols for potential data processing. By dividing the processing into segments, the UE can decode the SCI early and disable baseband processing for the second set of symbols when communication is suspended, thereby reducing power consumption while maintaining the capability to process when needed.
2Use of energy by moving object
If the UE disables RF components early based on SCI decoding, then power consumption is reduced, but the ability to detect subsequent data may be compromised
Solution Approach 1:
The UE performs preliminary decoding of the SCI to determine the communication status before disabling RF components. This preliminary action ensures that the decision to disable components is based on actual communication conditions, maintaining reliability while enabling power savings. The UE only disables components after confirming suspension through successful SCI decoding.
3Reliability
If the UE processes all symbols in a time slot, then complete data reception is ensured, but power consumption increases unnecessarily when no data is present
Solution Approach 1:
The time slot processing is segmented into two phases: first, decoding the SCI in the initial symbols to determine communication status; second, either proceeding with full data processing or disabling baseband processing for the remaining symbols. This segmentation ensures complete data reception when needed while avoiding unnecessary power consumption when communication is suspended.
Solution Approach 2:
The UE performs partial processing by decoding only the necessary control information in the first set of symbols rather than processing all symbols uniformly. This partial action is sufficient to determine communication status and avoid excessive power consumption while maintaining the ability to receive complete data when communication is active.
Data Source
AI summary
Methods, systems, and devices for wireless communications are described. Some wireless communications systems may support communications. For example, a wireless communications system may support New Radio (NR) cellular-vehicle to everything (C-V2X) communication. In some examples, a user equipment (UE) may receive a sidelink control channel for a sidelink transmission on a first set of symbols of a time slot (e.g., the first two or three symbols of a time slot). The UE may decode the sidelink control channel and disable one or more radio frequency (RF) components associated with processing the sidelink transmission on a second set of symbols of the time slot based on decoding the sidelink control channel. For example, the UE may disable one or more RF components if the UE determines the sidelink control channel is decoded unsuccessfully.