Candidate Cell RRC Pre-Decoding for Low-Latency Mobility Switching
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Solution Overview
Problem
Existing communication systems face challenges in minimizing latency during lower layer triggered mobility (LTM) by requiring post-command decoding of RRC configurations, which prolongs the switching delay from a source cell to a target cell.
Innovation Solution
Configuring user equipment (UE) to fully decode RRC configurations for candidate cells prior to receiving the command to switch, thereby enabling early execution of LTM procedures such as timing advance acquisition and transmission configuration updates.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If RRC configurations are decoded after receiving the switch command, then the system maintains simplicity in configuration management, but the cell switching latency increases due to post-command decoding time
Solution Approach 1:
The patent applies preliminary action by decoding RRC configurations for candidate cells before receiving the actual cell switch command. The network provides RRC configuration messages containing configurations for multiple candidate cells in advance, and the UE decodes these configurations prior to needing to switch, eliminating post-command decoding delay while maintaining manageable complexity through structured configuration delivery
2Speed
If the system provides RRC configurations for multiple candidate cells in advance, then the cell switching speed improves, but the amount of configuration data to be managed increases
Solution Approach 1:
The patent applies segmentation by dividing the configuration management into distinct segments: the network segments the configuration delivery by providing RRC messages for multiple candidate cells separately and in advance, while the UE segments the processing by decoding only the configurations for provided candidate cells. This structured segmentation enables faster switching without overwhelming configuration data management
Solution Approach 2:
The patent uses the RRC configuration message as an intermediary mechanism that carries pre-decoded configuration data from the network to the UE. This intermediary allows the network to prepare and deliver configurations in advance, enabling the UE to have ready-to-use configurations without manually managing large volumes of raw configuration data
Data Source
AI summary
There is provided an apparatus comprising: means for receiving, on a source cell, a radio resource control configuration for at least one candidate cell including first configuration information and second configuration information; means for decoding the first configuration information; means for performing the at least one measurement based on the first configuration information; means for transmitting, on the source cell, a measurement report comprising at least one result of the at least one measurement; means for receiving, on the source cell, a message triggering the apparatus to decode the second configuration information; means for decoding the second configuration information; means for receiving, on the source cell, a command to switch the apparatus to a target cell selected amongst the at least one candidate cell; and means for switching to the target cell based on the second configuration information.