Handover Access Information Pre-allocation in Wireless Systems
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Solution Overview
Problem
In mobile communication systems, handover processing is delayed due to the possibility of Random Access Channel (RACH) collisions when a terminal moves from a source cell to a target cell, leading to increased processing time.
Innovation Solution
The terminal receives necessary information from the source cell in advance, allowing it to connect to the target cell with minimal delays by using a previously defined signature and transmission characteristics, avoiding RACH collisions and enabling efficient handover through pre-allocated radio resources.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the terminal uses the Random Access Channel (RACH) to transmit access information to the target base station during handover, then the terminal can establish connection with the target cell, but RACH collisions may occur causing handover processing delay
Solution Approach 1:
The source base station pre-allocates radio resources and provides access information to the terminal before handover execution. The terminal receives the handover command containing pre-configured uplink radio resources, allowing it to immediately access the target base station without performing random access procedure, thus avoiding RACH collisions and reducing handover latency
Solution Approach 2:
The patent extracts the random access procedure from the handover process by providing dedicated radio resources through the handover command. The terminal uses the pre-allocated uplink resources to directly transmit handover confirmation to the target base station, separating the connection establishment from the random access mechanism that causes collisions
2Ease of operation
If the terminal performs random access procedure to access the target base station, then connection can be established, but processing time increases due to collision possibility
Solution Approach 1:
The source base station performs preliminary configuration by allocating specific uplink radio resources and embedding access information in the handover command before the terminal executes handover. This preliminary action eliminates the need for random access procedure at the target base station, enabling immediate and collision-free access
Data Source
AI summary
In a wireless mobile communications system, a method of transmitting and receiving radio access information that allows a faster and an efficient way of establishing a radio connection between a terminal and a target base station while performing a handover for the terminal to a cell of the target base station. The network transmits in advance, the radio access information and the like, to the terminal so that the terminal can be connected with the target cell in a faster manner which minimizes the total time for the handover process.