Broadcast System Information Inheritance for EN-DC Cell Reselection
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Solution Overview
Problem
In wireless communication systems, EN-DC capable UEs face network congestion due to the lack of inherited broadcast system information, particularly alternative cell reselection priorities, leading to inefficient cell reselection procedures when moving between cells.
Innovation Solution
A wireless device inherits broadcast system information, including alternative cell reselection priorities, from a previous cell and applies them in a new cell, even if the new cell does not provide the information, by receiving an indication from the network to maintain priority settings.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If separate frequency priorities are broadcast for LTE UE and EN-DC UE, then cell reselection efficiency for EN-DC UE is improved, but system information complexity increases
Solution Approach 1:
The system information is segmented into two separate Information Elements: a legacy cell reselection priority (applicable to all UEs) and an alternative cell reselection priority (specifically for EN-DC UEs). This segmentation allows EN-DC UEs to receive dedicated frequency priority information without increasing the complexity burden on LTE UEs, thereby improving cell reselection efficiency for EN-DC UEs while maintaining compatibility with legacy devices.
Solution Approach 2:
The alternative cell reselection priority is applied locally and specifically to EN-DC capable UEs, rather than universally to all UEs. This local quality approach ensures that only the UEs requiring enhanced functionality (EN-DC UEs) benefit from the alternative priority information, while LTE-only UEs continue to use the legacy priority without being affected by the additional information element.
2Adaptability or versatility
If EN-DC UE follows legacy cell reselection priority in new cell, then compatibility with legacy cells is maintained, but network congestion occurs due to inability to apply alternative priority
Solution Approach 1:
The network performs preliminary action by broadcasting the alternative cell reselection priority in advance in the system information of the new cell before the EN-DC UE needs to perform cell reselection. This allows the EN-DC UE to proactively obtain and apply the alternative priority information, preventing network congestion by enabling efficient frequency selection before the UE actually camps on the new cell.
Solution Approach 2:
The alternative cell reselection priority information is copied from the network's configuration and transmitted to EN-DC UEs through the system information broadcast. This copying mechanism ensures that the priority settings determined by the network are accurately reproduced and delivered to the UEs, enabling them to follow the network's intended frequency priority without causing congestion.
3Speed
If UE discards system information when moving to new cell, then cell reselection speed is improved, but loss of alternative cell reselection priority occurs
Solution Approach 1:
The network performs preliminary action by pre-configuring and broadcasting the alternative cell reselection priority in the system information of the new cell before the UE completes the cell reselection process. This ensures that when the UE discards old system information to speed up reselection, the alternative priority is already available in the new cell's broadcast, preventing information loss.
Solution Approach 2:
The alternative cell reselection priority information is continuously maintained and broadcast by the network in the system information of each cell. This continuity ensures that as the UE moves between cells and discards previous system information, the alternative priority is always available for immediate acquisition, maintaining the useful action of priority-based reselection without interruption or information loss.
Data Source
AI summary
A method and apparatus for inheriting a broadcast system information in a wireless communication system is provided. A wireless device receives, from a first cell, a broadcast system information including a first information and a second information. A wireless device receives, from a second cell, another broadcast system information including anew information to replace the first information. A wireless device performs a measurement procedure, a cell selection procedure, and/or a cell reselection procedure while in the second cell, based on the second information received from the first cell.