Speculative Buffer Status Report for Uplink Latency Reduction
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Solution Overview
Problem
The existing radio communication systems face latency issues due to the scheduling request and buffer status report procedures, which hinder the achievement of low latency and high reliability in ultra-reliable and low latency communication (URLLC) scenarios.
Innovation Solution
The implementation of a speculative buffer status report mechanism, where user equipment transmits anticipated traffic information to the base station, allowing resource allocation without waiting for a scheduling request or buffer status report, thereby reducing uplink transmission latency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the traditional scheduling request and buffer status report procedure is used, then the system maintains reliable resource allocation control, but the uplink transmission latency increases
Solution Approach 1:
The base station performs preliminary resource allocation by granting uplink resources to the UE before the UE actually transmits the buffer status report. The base station predicts the buffer status and allocates resources in advance, eliminating the waiting time between buffer status report transmission and resource allocation while maintaining reliable control through subsequent confirmation procedures.
2Measurement precision
If the buffer status report is transmitted after scheduling request, then the system ensures accurate buffer status information, but the transmission latency increases due to sequential processing
Solution Approach 1:
The base station performs preliminary resource allocation based on predicted buffer status before receiving the actual buffer status report from the UE. This allows the system to maintain accurate buffer status information while reducing latency by eliminating the sequential dependency between report transmission and resource allocation.
Solution Approach 2:
The system uses feedback mechanisms where the base station receives the buffer status report from the UE and confirms or adjusts the preliminary resource allocation. This ensures accurate buffer status information is utilized while maintaining the low-latency benefit of advance resource allocation through iterative refinement.
Data Source
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AI summary
To provide a technology of quickly transmitting a buffer status for a reduction of uplink transmission latency. Provided is a user equipment including: a transmission and reception unit that transmits and receives a radio signal to and from a base station; and a buffer status report transmission unit that transmits, to the base station, a speculative buffer status report indicating a buffer status that is expected in a subsequent subframe.