Sidelink Interference Coordination via RSSI Feedback
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Solution Overview
Problem
Current V2V communication networks face challenges in sidelink resource allocation due to location-based reuse strategies that do not account for physical wave propagation, leading to inefficient spectral use and interference issues, especially in urban environments, and fail to consider the impact on nearby receivers, resulting in lower spectral efficiency and inability to meet high SINR requirements without conservative resource reuse.
Innovation Solution
Implement a method where wireless communication devices measure and share Physical Sidelink Shared Channel (PSSCH) Reference Signal Received Power (RSRP) and Sidelink Received Signal Strength Indicator (S-RSSI) to determine interference headroom, allowing for more efficient sidelink resource selection and allocation, enabling multiple transmissions within the same time-frequency resource while ensuring minimal interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If location-based reuse strategy is used to ensure minimal interference, then SINR requirement is satisfied, but spectral efficiency decreases due to conservative resource reuse
Solution Approach 1:
The patent changes the parameter basis for resource allocation from geographic location to actual wireless channel conditions (RSSI measurements). By measuring received signal strength indicators at receiving UEs and reporting them to the network entity, the system adapts resource allocation to real-time propagation conditions rather than using fixed geographic reuse distances, thereby improving spectral efficiency while maintaining SINR requirements.
Solution Approach 2:
The patent implements a feedback mechanism where receiving UEs measure the RSSI of sidelink signals and report these measurements to the network entity. This feedback loop enables the network to make informed decisions about resource allocation based on actual interference conditions, allowing more aggressive resource reuse when channel conditions permit while maintaining reliable communication.
2Productivity
If multiple transmissions are allowed within the same time-frequency resource to increase system capacity, then spectral efficiency improves, but interference between transmissions increases
Solution Approach 1:
The patent uses RSSI feedback from receiving UEs to the network entity to dynamically control resource allocation. When multiple transmissions are scheduled in the same time-frequency resource, the network entity uses the reported RSSI measurements to assess actual interference levels and adjust future resource allocations accordingly, enabling safe multi-transmission scenarios while preventing harmful interference.
Solution Approach 2:
The patent changes the control parameter from static geographic distance to dynamic channel quality indicators (RSSI). This allows the system to permit multiple transmissions in the same resource when channel conditions indicate low interference, while automatically reducing resource reuse when measurements show high interference levels, thus balancing capacity and interference.
3Object-generated harmful factors
If location-based reuse strategy is used to determine resource allocation, then interference is controlled, but the strategy does not account for actual physical wave propagation and environmental factors
Solution Approach 1:
The patent replaces location-based control with RSSI-based feedback control. Receiving UEs measure the actual received signal strength and report these measurements to the network entity, which then makes resource allocation decisions based on real-world propagation conditions including urban canyons, rural open areas, and other environmental factors that affect wireless channels.
Solution Approach 2:
The patent changes the basis of resource allocation from geographic parameters (location coordinates and reuse distances) to physical channel parameters (RSSI measurements). This enables the system to adapt to different propagation environments automatically, as the RSSI measurements inherently reflect the actual wireless conditions including building shielding, distance, and environmental obstacles.
4Ease of operation
If centralized entity collects positions of all UEs for location-based reuse, then resource allocation is coordinated, but the approach requires network coverage and increases system complexity
Solution Approach 1:
The patent inverts the traditional approach by having receiving UEs (rather than the centralized network entity) perform the measurements and generate the feedback information. Instead of the network collecting location data from all UEs, the network receives RSSI measurements from UEs about their received signals, thereby distributing the measurement burden and reducing centralized coordination requirements.
Solution Approach 2:
The patent enables UEs to self-measure the RSSI of received sidelink signals and self-report these measurements to the network entity. This self-service approach reduces the need for complex centralized position collection and processing, as each UE independently provides the information needed for resource allocation decisions based on its own reception conditions.
Data Source
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AI summary
A wireless communication device (UE) supporting a plurality of sidelink radio resources, SRR, UE measuring a first signal strength parameter PSSCH RSRP, associated with at least one neighboring UE, and/or measuring a second signal strength parameter S-RSSI associated with at least one of the plurality of SRRs. UE determines an interference-related parameter H i es, especially a PSSCH Interference Headroom, associated with at least one of the plurality of SRRs, computes first map mapping identity-related parameter (ID i) of the at least one neighboring UE to Pij or a function thereof, and/or compute a second map (C) mapping at least one SSRs to I i (s) or H j (s) or function thereof. The UE configured to transmit Sj and/or Cj to base station, and/or to at least one neighboring UE.