D2D Indicator Signal Reduces UE Power Consumption
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Solution Overview
Problem
In Device-to-Device (D2D) communication, user equipment (UE) experiences high power consumption due to the need to monitor and decode multiple subchannels within the resource pool to determine if data is addressed to it, which is inefficient for UEs with limited power resources such as pedestrians and cyclists.
Innovation Solution
The proposed solution involves configuring an indicator resource set prior to the resource pool, allowing the UE to monitor an indicator signal that identifies the data channel, thereby reducing the need to receive and decode all Physical Sidelink Control Channel (PSCCH) code blocks, minimizing delay and processing requirements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the UE monitors and decodes all PSCCH code blocks in the resource pool to determine if data is addressed to it, then the UE can reliably identify targeted data, but the power consumption increases significantly
Solution Approach 1:
The patent segments the original monolithic monitoring and decoding process into two distinct stages: first monitoring a compact indicator resource set for indicator signals, and only then decoding full PSCCH code blocks if the indicator signal is detected. This segmentation allows the UE to avoid unnecessary full decoding operations, significantly reducing power consumption while maintaining reliable data identification when needed.
Solution Approach 2:
The patent implements preliminary action by having the UE monitor indicator signals in the indicator resource set before committing to full PSCCH decoding. This preliminary check acts as a filter, allowing the UE to prepare for potential data reception without performing the energy-intensive full decoding process unless the indicator signal confirms that data is actually targeted to the UE.
2Productivity
If the UE monitors all subchannels in the resource pool, then the UE can detect all potential data transmissions, but the processing complexity and time increase
Solution Approach 1:
The patent divides the monitoring task into two segments: monitoring the compact indicator resource set for indicator signals, and conditionally monitoring full PSCCH code blocks only when indicator signals are detected. This segmentation reduces the average processing complexity and time by eliminating unnecessary full monitoring when no data is targeted to the UE.
Solution Approach 2:
The patent introduces an intermediary mechanism - the indicator signal - that mediates between the UE and the full PSCCH monitoring process. This intermediary provides a efficient filtering layer that reduces the burden of monitoring all subchannels while maintaining the capability to detect all potential data transmissions targeted to the UE.
3Reliability
If the UE continuously monitors the resource pool for data, then no data is missed, but power is wasted when no messages are received
Solution Approach 1:
The patent implements periodic action through a two-stage monitoring cycle: first periodically checking the indicator resource set for indicator signals, and only then periodically monitoring full PSCCH code blocks if indicators are present. This periodic two-stage approach ensures no data is missed while avoiding continuous full monitoring that would waste power when no messages are received.
Solution Approach 2:
The patent uses preliminary action by checking indicator signals before full monitoring. This preliminary check ensures that the UE only commits to energy-intensive full PSCCH decoding when there is actually data to be received, preventing wasted power while maintaining complete data reception capability.
Data Source
AI summary
A method carried out in a user equipment, UE, (10) for monitoring a resource pool (41) configured for direct device-to-device communication, comprising: —monitoring (S710) an indicator resource set (42), configured prior to said resource pool; and upon receiving, in the monitored indicator resource set, an indicator signal comprising an identifier associated with said UE; —identifying (S740), based on the received indicator signal, a data channel in the resource pool.