Base Station Controller Random Access Preamble Selection
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Solution Overview
Problem
In the 5G mobile communication system's non-standalone (NSA) mode, the existing methods for user equipment to connect to a 5G base station either face delays due to random access preamble contention or require time for the 4G base station to acquire the preamble from the 5G base station, leading to inefficient connection processing.
Innovation Solution
A base station controller determines whether to include a random access preamble acquired from another base station in a connection instruction based on the congestion level and service type of the user equipment, allowing for either contention-based or non-contention-based random access procedures, thereby optimizing connection processing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If user equipment acquires random access preamble from system information broadcast by 5G base station, then connection can be established, but connection processing experiences delays due to random access preamble contention
Solution Approach 1:
The 4G base station acquires the random access preamble from the 5G base station in advance and includes it in the connection instruction message before the user equipment needs to connect. This preliminary acquisition eliminates the need for user equipment to perform random access preamble selection and contention resolution, thereby reducing connection processing delay while ensuring reliable connection establishment.
2Productivity
If 4G base station provides random access preamble to user equipment, then connection processing efficiency is improved, but 4G base station requires time to acquire preamble from 5G base station
Solution Approach 1:
The 4G base station performs the preamble acquisition from the 5G base station as a preliminary action before the user equipment connection process begins. By including the acquired preamble in the connection instruction message, the system eliminates subsequent contention delays, making the initial acquisition time worthwhile for overall connection processing efficiency improvement.
3Reliability
If connection instruction includes random access preamble, then random access contention is reduced, but connection instruction message size increases
Solution Approach 1:
The random access preamble is extracted as a separate element and included within the connection instruction message. This allows the preamble to be provided directly to the user equipment without requiring additional message exchanges, reducing random access contention while the increase in message size is acceptable given the overall system efficiency gains.
Data Source
AI summary
A base station used in a mobile communication system includes a wireless communicator performing wireless communication with user equipment, and a controller controlling the wireless communicator. The wireless communicator transmits, to the user equipment, a connection instruction of causing the user equipment to connect to another base station. The controller determines whether to include, in the connection instruction, a random access preamble acquired by the base station from the other base station, based on at least one selected from the group consisting of a congestion level of the other base station and a service type used by the user equipment.