User Equipment Broadcast Information Requests for Seamless Handover
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Solution Overview
Problem
In mobile communication systems, there is a challenge of service interruption during handover between cells due to the unavailability of broadcast control information in adjacent cells, leading to delays in obtaining necessary system information for seamless multicast/broadcast service reception.
Innovation Solution
A communication method where a user equipment in one cell requests broadcast control information from another user equipment or a base station in an adjacent cell, enabling early acquisition of system information through sidelink communication or direct base station interaction, thereby reducing service interruption time.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If user equipment waits for broadcast control information to be available in the current cell during handover, then service continuity is maintained, but service interruption time increases
Solution Approach 1:
The user equipment proactively requests broadcast control information from adjacent cells before actually needing it for handover. This preliminary acquisition of system information from neighboring cells allows the UE to prepare for upcoming handovers in advance, reducing service interruption time while maintaining reliable service continuity.
2Loss of time
If user equipment requests broadcast control information from adjacent cells proactively, then service interruption is reduced, but communication complexity increases
Solution Approach 1:
The base station acts as an intermediary to manage the complexity of proactive information requests. When the user equipment requests broadcast control information from adjacent cells, the serving base station coordinates and facilitates this request, handling the signaling and information retrieval processes, thereby reducing the communication complexity burden on the user equipment.
3Productivity
If user equipment obtains broadcast control information from adjacent cells early, then handover performance improves, but signal transmission requirements increase
Solution Approach 1:
The user equipment requests only the specific broadcast control information needed for handover from adjacent cells, rather than all available system information. This partial action approach obtains just the necessary system information blocks and broadcast control data required for seamless handover, reducing the energy consumption and signal transmission requirements compared to acquiring complete information sets.
Data Source
AI summary
A communication method used in a mobile communication system includes transmitting, by a first user equipment existing in a first cell, a request signal for requesting provision of broadcast control information to be broadcast in a second cell adjacent to the first cell to a predetermined apparatus. The predetermined apparatus is a second user equipment existing in the second cell, a first base station managing the first cell, or a second base station managing the second cell.