Wireless BSR Triggering by HARQ State for Lower Uplink Latency
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Solution Overview
Problem
The challenge in wireless communication systems is to efficiently manage uplink and downlink data and control information transmission using limited radio resources, particularly addressing latency and delay issues that impact performance-critical applications.
Innovation Solution
A method and apparatus for transmitting a buffer status report (BSR) by a user equipment (UE) that differentiates between two states: one allowing Hybrid Automatic Repeat Request (HARQ) retransmission and another not allowing it, based on logical channel priority and availability, to optimize resource allocation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of information
If the UE transmits BSR for all logical channels with available UL data, then the network can obtain complete buffer status information, but the resource allocation overhead and latency increase
Solution Approach 1:
The patent applies local quality by differentiating the BSR triggering behavior based on the logical channel's HARQ state configuration. For logical channels with HARQ retransmission enabled, the UE triggers BSR only when necessary (when no other higher-priority channels have data), whereas for channels without HARQ, the triggering follows traditional rules. This localized differentiation optimizes the balance between information completeness and latency reduction.
2Productivity
If the UE triggers BSR frequently to provide timely buffer status updates, then the network can allocate resources more efficiently, but the uplink resource consumption and interference increase
Solution Approach 1:
The patent changes the triggering parameter conditions based on the logical channel's HARQ state. By modifying the BSR triggering conditions according to the channel state (HARQ enabled or disabled), the system dynamically adjusts resource usage patterns. This parameter-based differentiation reduces unnecessary BSR transmissions while maintaining efficient resource allocation for channels that require it.
3Reliability
If the network assigns UL resources for HARQ retransmission, then the reliability of data transmission improves, but the resource allocation complexity and delay increase
Solution Approach 1:
The patent segments logical channels into two categories based on HARQ retransmission capability: channels with HARQ enabled and channels without HARQ. This segmentation allows the network to apply different resource allocation strategies and BSR triggering rules for each segment, simplifying the overall resource allocation complexity while maintaining high reliability for channels that require retransmission.
Data Source
AI summary
The present invention relates to a method of transmitting a buffer status report (BSR) by a user equipment (UE) in a wireless communication system. Especially, the method includes the steps of receiving information on a logical channel from a network, wherein the information indicates that the logical channel is one of a first state or a second state; triggering the BSR when uplink (UL) data for the logical channel becomes available and when either none of other logical channels which are the indicated state contains any available UL data or the UL data belongs to the logical channel with higher priority than a priority of any logical channel containing available UL data and being the indicated state; and transmitting the BSR to the network.