Sidelink Relay Pre-Emptive BSR Triggering for Lower Delay
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Solution Overview
Problem
In sidelink relay structures, the pre-emptive Buffer Status Report (BSR) trigger condition introduced in existing Integrated Access Backhaul (IAB) architectures cannot be applied, leading to transmission delays due to the lack of allocated uplink resources by the IAB node.
Innovation Solution
A method for triggering a sidelink pre-emptive BSR is introduced, where a relay device receives sidelink control information and/or data from a UE, determines the expectation of future data reception, and triggers a pre-emptive BSR based on this expectation, utilizing a shared resource pool for uplink resource allocation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If the IAB node allocates uplink resources to the UE using traditional BSR mechanism, then the base station can schedule resources, but additional transmission delay occurs due to the need for UE to transmit BSR request resource to IAB node and IAB node to transmit to base station
Solution Approach 1:
The patent applies preliminary action by introducing a pre-emptive BSR mechanism where the IAB node proactively transmits BSR information to the base station before actual data transmission occurs. This allows the base station to pre-allocate uplink resources, eliminating the need for subsequent BSR request transmissions and reducing overall transmission delay.
Solution Approach 2:
The IAB node acts as an intermediary that receives sidelink control information from the UE, determines the expectation of future data reception, and triggers pre-emptive BSR transmission to the base station. This intermediary function enables resource allocation optimization without requiring direct UE-base station communication for BSR purposes.
2Productivity
If pre-emptive BSR mechanism is introduced to reduce transmission delay, then resource scheduling efficiency improves, but the mechanism cannot be directly applied to sidelink relay structures
Solution Approach 1:
The patent extends the pre-emptive BSR mechanism to work in both traditional IAB architectures and sidelink relay structures. By making the mechanism architecture-agnostic, it achieves universality, allowing the same resource scheduling optimization to be applied across different network configurations including relay nodes that forward data between UEs and the network.
Solution Approach 2:
The patent adapts the pre-emptive BSR mechanism by changing the triggering parameters and conditions based on the network architecture. In sidelink relay structures, the triggering is based on receiving sidelink control information and determining expectation of future data reception, rather than traditional uplink resource allocation events, thus making the mechanism adaptable to different architectural parameters.
3Use of energy by moving object
If the relay device uses shared resource pool for uplink resource allocation, then resource utilization optimizes and power consumption reduces, but transmission delay may increase without pre-emptive BSR triggering
Solution Approach 1:
The relay device performs preliminary action by triggering pre-emptive BSR when it receives sidelink control information indicating expected future data reception. This allows the network to allocate resources in advance from the shared resource pool, ensuring that when data arrives, resources are already available, thus avoiding delay while maintaining efficient resource utilization and reducing power consumption through proactive scheduling.
Data Source
AI summary
A method for triggering a sidelink pre-emptive buffer status report, a relay device and a medium are provided. The method includes: receiving sidelink control information and/or first data transmitted by a UE; determining whether there is an expectation of receiving second data in the future based on the sidelink control information and/or the first data; and triggering the pre-emptive BSR based on determining that there is the expectation of receiving the second data in the future; wherein the sidelink control information indicates the first data.