Sidelink Complementary Resource Window for Missed Transmissions
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Solution Overview
Problem
In sidelink communication, when a transmitting terminal device fails to transmit a sidelink transmission over a reserved resource due to overlapping communication activities, the receiving terminal device is left with no option but to monitor outside the reserved resources, leading to potential packet loss and increased power consumption.
Innovation Solution
Introduce a sidelink complementary resource set window (SL-CRS) for the receiving terminal device to monitor for missed transmissions, allowing it to adjust its monitoring strategy based on configured criteria and conditions, such as QoS and radio conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If the receiving terminal device monitors only the initially reserved sidelink resource, then power consumption is reduced, but latency increases when the transmission cannot be sent over the reserved resource
Solution Approach 1:
The receiving terminal device performs preliminary action by monitoring the sidelink complementary resource set window in advance, preparing to receive the sidelink transmission if it is not received over the initially reserved resource. This allows the device to proactively handle missed transmissions without increasing unnecessary power consumption, as the monitoring of the complementary window only activates when needed.
2Reliability
If the receiving terminal device waits for the next reserved resource interval, then power management is simplified, but packet loss risk increases when the next interval is not aligned with discontinuous reception schedule
Solution Approach 1:
The sidelink complementary resource set window acts as an intermediary mechanism between the initially reserved resource and the next reserved resource interval. It provides a buffer period where the receiving terminal device can monitor for missed transmissions, ensuring reliable data reception without complicating the power management schedule. The complementary window serves as a mediator that bridges the gap between reserved resources and DRX cycles.
3Ease of operation
If the transmitting terminal device postpones the sidelink transmission to the next reserved resource, then transmission scheduling is simplified, but latency increases and packet loss risk increases
Solution Approach 1:
The system introduces dynamic flexibility by allowing the transmitting terminal device to transmit the sidelink transmission within the sidelink complementary resource set window rather than being rigidly constrained to the next reserved resource interval. This dynamic approach enables the transmitting device to optimize transmission timing based on actual conditions, reducing latency while maintaining scheduling simplicity.
Data Source
AI summary
A method comprising receiving an indication from a transmitting terminal device indicative of a sidelink resource reserved for receiving a subsequent sidelink transmission from the transmitting terminal device, detecting that the subsequent sidelink transmission is not received from the transmitting terminal device over the reserved sidelink resource, determining a sidelink complementary resource set window, and monitoring the sidelink complementary resource set window for receiving the subsequent sidelink transmission from the transmitting terminal device.