Radio Terminal Random Access Latency Reduction
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Solution Overview
Problem
Current mobile communication systems face challenges in reducing uplink latency during the random access procedure, which hinders fast uplink access and affects TCP throughput.
Innovation Solution
A radio terminal and base station configuration that allows the notification of uplink data amounts during the random access procedure, enabling immediate uplink data transmission without the need for separate scheduling requests and buffer status reports, thereby reducing latency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the random access procedure is used for uplink access, then the radio terminal can establish connection with the base station, but the uplink latency increases due to additional scheduling request and buffer status report steps
Solution Approach 1:
The patent combines the buffer status report (BSR) transmission with the random access preamble transmission. Instead of sending BSR separately after random access completion, the terminal embeds buffer status information directly in the random access preamble message, merging two communication functions into one transmission step. This eliminates the need for separate scheduling request and buffer status report steps, directly reducing uplink latency while maintaining reliable connection establishment.
2Productivity
If separate scheduling request and buffer status report steps are added to the transmission procedure, then the base station can allocate resources efficiently, but the overall transmission latency increases
Solution Approach 1:
The patent applies preliminary action by having the terminal report its buffer status information during the random access procedure itself, before the formal scheduling process begins. The base station receives the buffer status report embedded in the random access preamble and can prepare resource allocation in advance. This preliminary exchange of information eliminates the need for separate scheduling request and buffer status report steps that would otherwise delay the transmission process.
Data Source
AI summary
A radio terminal according to an embodiment includes a controller configured to control a random access procedure. The random access procedure includes first processing of transmitting a random access preamble to a base station, second processing of receiving a random access response from the base station, and third processing of performing uplink transmission to the base station based on the random access response. The controller is configured to notify, in the first processing or the third processing, the base station of an amount of uplink data in a transmission buffer of the radio terminal.