Radio Signal Feedback Gating for Range-Limited Group Communication
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Solution Overview
Problem
In wireless communication systems, particularly in V2X/V2V/D2D environments, feedback from receiving devices that are too distant from the transmitting device leads to unnecessary retransmissions, degrading system performance due to the highly mobile nature of transmitters and receivers.
Innovation Solution
Receiving devices determine their proximity to the transmitting device based on measured signal strength and provide feedback only when within the intended range, while transmitting devices limit retransmissions based on signal strength of received feedback.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If receiving devices provide feedback regardless of distance, then reliability of message delivery is improved, but system performance deteriorates due to unnecessary retransmissions from distant devices
Solution Approach 1:
The patent applies local quality by making feedback provision location-dependent. Receiving devices determine their distance from the transmitting device and only provide feedback when within a specified distance threshold. This creates different feedback behaviors for different spatial locations, resolving the contradiction by ensuring reliable feedback from nearby devices while preventing unnecessary retransmissions from distant devices.
Solution Approach 2:
The patent changes the parameter of feedback provision from unconditional to conditional based on measured distance. By introducing a distance parameter and comparing it against a threshold, the system dynamically adjusts feedback behavior, allowing reliable message delivery within range while maintaining system performance by avoiding unnecessary retransmissions from out-of-range devices.
2Reliability
If retransmissions are performed for all feedback received, then reliability of message delivery is improved, but loss of energy increases due to unnecessary retransmissions
Solution Approach 1:
The patent applies local quality by making retransmission behavior location-dependent. The transmitting device determines distance to receiving devices and only performs retransmissions when the receiving device is within a specified distance threshold. This resolves the contradiction by ensuring reliable message delivery for nearby devices while conserving energy by avoiding unnecessary retransmissions to distant devices.
Solution Approach 2:
The patent changes the parameter of retransmission from unconditional to conditional based on measured distance. By introducing a distance parameter and comparing it against a threshold, the system dynamically adjusts retransmission behavior, ensuring reliable delivery within range while reducing energy consumption by preventing unnecessary retransmissions to out-of-range devices.
3Reliability
If receiving devices send feedback continuously, then reliability of communication is improved, but use of energy by receiving devices increases
Solution Approach 1:
The patent applies local quality by making feedback transmission location-dependent. Receiving devices measure their distance from the transmitting device and only send feedback when within a specified distance threshold. This resolves the contradiction by ensuring reliable communication feedback from nearby devices while conserving their energy by avoiding unnecessary feedback transmissions from distant locations.
Solution Approach 2:
The patent changes the parameter of feedback transmission from continuous to conditional based on measured distance. By introducing a distance parameter and comparing it against a threshold, receiving devices dynamically adjust their feedback behavior, ensuring communication reliability when needed while reducing energy consumption by suppressing unnecessary feedback transmissions.
Data Source
AI summary
A method, a computer-readable medium, and an apparatus may include a receiving UE that is configured to receive at least a portion of a message for a service group, measure a signal strength for the message received, and determine whether to send feedback based on the signal strength measured for the message. In some aspects, a transmitting UE is configured to determine an intended range for a service group, and transmit a message for the service group based, at least in part, on the intended range. In some aspects, the transmitting UE is configured to receive HARQ feedback from at least one receiving UE, measure a signal strength for the HARQ feedback, and determine whether to resend the message based on the signal strength measured for the HARQ feedback.