Uplink Synchronization Information Transfer for Wireless Handover
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Solution Overview
Problem
In heterogeneous wireless communication networks, dual connectivity user equipment frequently experiences burdensome random access procedures and delays in obtaining uplink synchronization due to frequent handovers and changes in small cell connections, especially when moving between cells with different timing advance groups.
Innovation Solution
A method where a source base station requests and receives uplink synchronization information from a target base station and transmits this information to user equipment intending to move to the target base station, allowing them to synchronize without performing additional random access procedures, thereby reducing the burden on both the base station and user equipment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If dual connectivity user equipment performs random access procedure for uplink synchronization frequently due to frequent handovers and small cell changes, then uplink synchronization can be maintained, but the burden on base station and user equipment increases and synchronization delay occurs
Solution Approach 1:
The source base station performs preliminary action by requesting and obtaining uplink synchronization information from the target base station before the user equipment actually needs to handover. This synchronization information is then provided to the user equipment in advance, allowing them to perform handover without performing the full random access procedure, thus reducing the frequency of random access procedures while maintaining uplink synchronization reliability
Solution Approach 2:
The source base station acts as an intermediary that facilitates the handover process. It obtains synchronization information from the target base station and transmits it to the user equipment, enabling the user equipment to synchronize with the target cell without directly performing the random access procedure, thereby reducing system burden while maintaining synchronization
2Reliability
If user equipment performs additional random access procedure when moving between different timing advance groups, then uplink synchronization can be achieved, but handover speed decreases and synchronization delay increases
Solution Approach 1:
The source base station performs preliminary action by obtaining uplink synchronization information from the target base station before the handover actually occurs. This information is prepared in advance and provided to the user equipment, allowing them to skip the random access procedure during handover and achieve fast handover while maintaining proper uplink synchronization even when moving between different timing advance groups
Solution Approach 2:
The source base station copies or obtains the synchronization information from the target base station and provides it to the user equipment. This allows the user equipment to reuse the synchronization parameters without performing the full random access procedure, thereby achieving fast handover while maintaining synchronization accuracy across different timing advance groups
Data Source
AI summary
The present invention relates to a method for transmitting information for synchronization of a user equipment by a base station in a wireless communication system and apparatus for the same. In one embodiment of the present invention, a source base station transmits a request message requesting uplink synchronization information according to a predetermined reference to a target base station, receives a response message including the synchronization information from the target base station in response to the requested message, and transmits the received synchronization information to one or more user equipments which are to move to a cell serviced by the target base station. The synchronization information is used when the user equipments move to the cell serviced by the target base station without a process of acquiring the synchronization information.