Cell Reselection Candidate Lists for Energy-Efficient 5G Networks
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Solution Overview
Problem
Existing mobile communication systems face challenges in achieving network energy efficiency during cell reselection processes, particularly in 5G networks, due to the need for continuous transmission of system information in all cells, which consumes significant energy.
Innovation Solution
Implementing a method where cell reselection is based on receiving system information blocks (SIBs) in a first cell, determining candidate cells using specific lists, and performing reselection to a second cell, with certain cells being considered candidates only if they include a third list associated with the first list and have their physical cell identity indicated, thereby allowing selective transmission of system information.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If system information is continuously transmitted in all cells, then cell reselection can be performed, but network energy consumption increases
Solution Approach 1:
The patent extracts system information transmission from all cells and concentrates it only in the target cell where reselection is occurring. The source cell stops transmitting system information after triggering reselection, thereby eliminating unnecessary energy consumption while maintaining reselection functionality.
Solution Approach 2:
System information transmission is changed from continuous periodic transmission in all cells to on-demand transmission only in the target cell when reselection is triggered. This transforms the transmission pattern from continuous to event-driven, reducing overall energy consumption.
2Use of energy by stationary object
If system information transmission is reduced for energy saving, then energy efficiency improves, but cell reselection reliability may deteriorate
Solution Approach 1:
The target cell prepares and transmits system information in advance before the UE actually needs to reselect. This preliminary action ensures that system information is available when needed, maintaining reselection reliability while allowing the source cell to stop transmission afterward.
Solution Approach 2:
The patent introduces a handover command as an intermediary mechanism that carries essential system information from the target cell to the UE. This intermediary ensures reliable information transfer without requiring continuous transmission from the source cell.
Data Source
AI summary
A method and apparatus to support cell reselection operation in a system with enhanced network energy efficiency. The method includes receiving one or more system information blocks (SIBs) in a first cell, determining a set of candidate cells for cell reselection based on a first list or a second list and performing cell reselection to a second cell, wherein the second cell belongs to the set of candidate cells. The cell indicated in the first list in a first SIB is not considered as candidate cell in case that the first SIB does not comprise a third list associated with the first list. cell indicated in the first list in a first SIB is considered as candidate cell in case that the first SIB comprises the third list associated with the first list and the physical cell identity of the cell is indicated in the third list.