UE Buffer Delay Reporting for Uplink Grant Timing
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Solution Overview
Problem
Existing wireless communication systems face challenges in accurately determining the time a packet has been buffered in user equipment (UE) and managing unused configured grant (CG) occasions, leading to potential violations of access network packet delay budgets and inefficient resource allocation.
Innovation Solution
Implement methods for delay reporting of buffered data and unused CG occasion reporting, including transmitting buffered data delay indications and releasing unused resources, to enhance resource management and compliance with delay budgets.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the radio network element allocates UL grant based on AN PDB without considering packet buffer time, then resource allocation is simplified, but UL packet transmission delay exceeds AN PDB
Solution Approach 1:
The UE feeds back delay information about buffered packets to the gNB through BSR MAC CEs. This feedback mechanism enables the gNB to adjust UL grant allocation based on actual packet buffer time, ensuring transmission delay requirements are met while maintaining efficient resource allocation.
Solution Approach 2:
The system performs preliminary actions by having the UE report buffer status and delay information before UL grant allocation. This allows the gNB to pre-calculate appropriate grant timing based on packet age, preventing delay violations before they occur.
2Loss of time
If periodic CG resources are configured for UL transmission, then low latency transmission is enabled, but unused CG occasions waste network resources
Solution Approach 1:
The system dynamically adjusts CG resource allocation based on actual traffic conditions. When traffic patterns change or packets are successfully transmitted earlier than expected, the gNB can release unused CG occasions and reconfigure resources, optimizing the balance between low-latency transmission and resource efficiency.
Solution Approach 2:
Unused CG occasions are discarded and the corresponding network resources are recovered for reallocation. The gNB monitors CG resource utilization and releases configurations when occasions remain unused, allowing those resources to be assigned to other UEs or purposes, thereby reducing network resource waste while maintaining low-latency capabilities when needed.
Data Source
AI summary
The present disclosure describes techniques for delay reporting of buffered data in a wireless communication system. A buffered data delay reporting indication is transmitted to a user equipment (UE). A delay report of buffered data is received from the UE identifies: a duration from an occasion a packet arrived in the buffer to an occasion where the delay report was transmitted, a duration from the occasion a packet arrived in the buffer to an occasion indicated by a reference time, a remaining duration from the occasion where the delay report was transmitted an occasion an access network packet delay budget is reached, a remaining duration from an occasion indicated by the reference time to the occasion an access network packet delay budget is reached, or a duration from the occasion the delay report was transmitted to an expiration time of a packet discard timer.