Mobile Device Random Access Handling on Primary and Secondary Cells
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Solution Overview
Problem
In LTE-Advanced systems, mobile devices face challenges in managing random access procedures on Primary Cells when a procedure on a Secondary Cell is ongoing or about to start, leading to potential parallel random access procedures and increased complexity.
Innovation Solution
The method involves selectively initiating, aborting, or delaying the random access procedure on the Primary Cell based on the status of the Secondary Cell procedure, ensuring that the device completes or postpones the Secondary Cell procedure until the Primary Cell procedure is finished, thereby avoiding parallel procedures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If the mobile device initiates random access procedure on PCell when SCell procedure is ongoing, then the scheduling request can be handled timely, but parallel random access procedures increase device complexity and resource consumption
Solution Approach 1:
The patent applies preliminary action by checking whether an SCell random access procedure is ongoing or about to start before initiating the PCell random access procedure. This advance check prevents the device from entering a complex parallel procedure state, thereby resolving the contradiction between timely response and device complexity.
2Productivity
If the mobile device performs parallel random access procedures on PCell and SCell, then both procedures can be completed independently, but device resources are consumed and power increases
Solution Approach 1:
The patent applies preliminary anti-action by prohibiting the initiation of PCell random access procedure when an SCell procedure is ongoing or about to start. This preventive measure avoids the harmful effect of parallel procedure execution, thereby reducing power consumption while maintaining acceptable procedure completion capability.
3Device complexity
If the mobile device waits for SCell procedure to complete before initiating PCell procedure, then parallel procedures are avoided, but time delay occurs
Solution Approach 1:
The patent checks in advance whether an SCell random access procedure is ongoing or about to start before initiating the PCell procedure. This preliminary check allows the device to make informed decisions about procedure initiation, avoiding unnecessary delays while maintaining simple procedure handling.
4Loss of time
If the mobile device initiates PCell random access procedure without checking SCell status, then response time is reduced, but parallel procedures may occur causing resource waste
Solution Approach 1:
The patent performs a preliminary check of the SCell random access procedure status before initiating the PCell procedure. This advance check enables the device to balance response time and energy efficiency by avoiding parallel procedure initiation when SCell procedures are ongoing or about to start, thereby preventing energy waste.
Data Source
AI summary
A method of handling a first random access procedure on a Primary Cell (PCell) for a mobile device when a second random access procedure on a Secondary Cell (SCell) is ongoing or is about to start is disclosed. The method comprises selectively initiating the first random access procedure on the PCell according to a result of the second random access procedure after the mobile device completes the second random access procedure on the SCell, wherein the first random access procedure is triggered by a pending scheduling request of the mobile device and the second random access procedure is triggered by need of synchronization on the SCell.