Sidelink Resource Selection via Dynamic RSRP Threshold Adjustment
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Solution Overview
Problem
Conventional sidelink scheduling techniques in wireless communications systems fail to effectively manage limited resources, leading to collisions, interference, and dropped transmissions between user equipment (UEs) due to insufficient resource availability.
Innovation Solution
A method where a UE determines available time-frequency resources by excluding resources used by neighboring UEs, using decoded control information and signal quality measurements, and dynamically adjusts the RSRP threshold and time window to select suitable resources for sidelink communications, with the base station configuring exclusion ranges and threshold increments.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional sidelink scheduling techniques are used, then resource allocation is simple, but resource availability is insufficient leading to collisions and interference
Solution Approach 1:
The UE performs preliminary actions by determining a time window for resource selection and identifying candidate resources before actual sidelink transmission. The UE proactively measures RSRP of reference signals from neighboring UEs and excludes resources that would cause interference, rather than reacting to collisions after they occur. This preliminary resource assessment and exclusion process ensures reliable transmission by preventing resource conflicts before they happen.
Solution Approach 2:
The resource selection mechanism incorporates feedback through RSRP measurements of reference signals from neighboring UEs. The UE continuously monitors the radio environment, measures signal quality, and uses this feedback information to dynamically exclude resources that would cause interference. This feedback-driven approach allows the UE to adapt resource selection to current channel conditions and neighboring UE transmissions, improving reliability while managing complexity through standardized measurement procedures.
2Reliability
If the RSRP threshold is increased to find more available resources, then resource availability improves, but interference from neighboring UEs increases
Solution Approach 1:
The patent converts the harmful effect of neighboring UE transmissions into beneficial information for resource selection. By measuring RSRP of reference signals from neighboring UEs, the UE identifies which resources are being used and excludes them from candidate resources. The very signals that represent interference also provide the information needed to avoid selecting those interfering resources. This transforms the harmful interference into a useful indicator for making better resource selection decisions.
Solution Approach 2:
The mechanism dynamically changes the RSRP threshold parameter based on measured RSRP values from neighboring UEs. When RSRP measurements indicate high interference levels, the threshold is adjusted to exclude more resources. When measurements show lower interference, the threshold allows more resources to be considered available. This dynamic parameter adjustment balances resource availability with interference avoidance, ensuring reliable transmission while adapting to changing radio conditions.
Data Source
AI summary
Methods, systems, and devices for wireless communications are described. A user equipment (UE) may measure the reference signal received power (RSRP) of reference signals from other UEs in a time window and exclude resources of transmissions with a measurement which is above RSRP threshold. In some cases, not enough resources are identified, and the UE may increase the RSRP and search for resources again, however the UE may only increase the RSRP until a stop RSRP limit is reached. The UE may increase the RSRP based on an absolute value or a factor of an incremental power value. Once the stop RSRP threshold is reached, the UE may modify the size of the time window, shift the time window, or reduce the number of retransmission of the sidelink message to search for resources for the sidelink message.