LTE Secondary Cell Index Modification via RRC Reconfiguration
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Solution Overview
Problem
In wireless communication systems, particularly in LTE systems using carrier aggregation (CA), there is a need to efficiently change the identification of a cell without disrupting ongoing connections, as existing methods for modifying secondary cell indices are inefficient and can cause signaling overhead and delays in data transmission.
Innovation Solution
A method and apparatus that allow a user equipment (UE) to receive a control signal indicating a change in cell index from a first cell index to a second index, configuring the cell using the new index without releasing the original cell, thereby modifying the secondary cell identification without adding signaling overhead or delaying data transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the cell index is changed by releasing the original cell and adding a new cell, then the cell identification can be updated, but the signaling overhead increases and data transmission is delayed
Solution Approach 1:
The patent changes the cell index parameter directly through RRC connection reconfiguration messages, allowing the network to update the secondary cell index from first to second index without releasing the cell. This parameter-based approach eliminates the need for cell release and re-addition procedures, thereby reducing signaling overhead and avoiding data transmission delays while maintaining accurate cell identification.
2Reliability
If the cell index is changed by releasing and re-adding the cell, then the identification is updated, but the signaling overhead increases
Solution Approach 1:
The patent modifies the cell index as a configuration parameter within the existing cell context using RRC connection reconfiguration messages. This approach updates the secondary cell index directly without triggering cell release and re-addition procedures, thereby minimizing signaling overhead while ensuring accurate cell identification is maintained throughout the process.
3Adaptability or versatility
If the secondary cell index is modified using existing methods, then the cell identification changes, but the process is inefficient and causes delays
Solution Approach 1:
The patent implements efficient secondary cell index modification by changing the index parameter directly through RRC connection reconfiguration messages. This method maintains cell index flexibility for network optimization while avoiding inefficient cell release and re-addition procedures, thereby preserving data transmission efficiency and preventing productivity loss.
4Reliability
If the cell configuration is updated with a new cell, then the identification changes, but the connection stability is disrupted
Solution Approach 1:
The patent updates the cell identification by modifying the secondary cell index parameter within the existing cell configuration through RRC connection reconfiguration messages. This approach maintains connection stability by keeping the cell context intact while updating the index, avoiding the connection disruptions that would occur with cell release and re-addition procedures.
Data Source
AI summary
A method for controlling identification of a cell in a communication system may be proposed. The method may include: setting a cell by using a first cell index in user equipment (UE); receiving, by the UE, a control signal indicating that a cell index is changed from the first cell index to a second cell index; and setting the cell by using the second cell index without releasing the cell by the UE.