Random Access Procedure Sequencing in Multi-Carrier Systems
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Solution Overview
Problem
In multi-carrier wireless communication systems, user equipment (UE) faces confusion when multiple random access procedures are requested simultaneously across different carrier frequencies, leading to indeterminate behavior or malfunction due to the limitation of performing only one random access procedure at a time in existing technologies like LTE.
Innovation Solution
A mobile communication device with a wireless module and controller module handles random access procedures by waiting for a predetermined period after the expiry of a deactivation timer for one carrier frequency before initiating a random access procedure on another, ensuring that the PDCCH order is not transmitted during an ongoing procedure, thus avoiding confusion and ensuring proper sequence handling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple random access procedures are requested simultaneously on different carrier frequencies, then the user equipment can request radio resources on multiple carriers, but confusion occurs regarding which procedure should be performed first leading to indeterminate behavior or malfunction
Solution Approach 1:
The patent segments the handling of multiple random access procedures by introducing a serialization mechanism. When multiple random access procedures are requested simultaneously on different carrier frequencies, the system divides them into sequential execution steps by identifying the first and second procedures, determining their execution order, and enforcing sequential processing rather than allowing parallel execution that would cause confusion.
2Reliability
If only one random access procedure is allowed at a given time for a UE, then execution order can be determined, but the ability to efficiently utilize multiple carrier frequencies is reduced
Solution Approach 1:
The patent applies dynamics by making the random access procedure execution flexible rather than rigidly sequential or parallel. The system dynamically determines the execution order based on specific criteria (such as carrier frequency indices or procedure priorities) and allows the UE to adapt its behavior according to the determined sequence, optimizing both reliability and efficiency.
3Productivity
If multiple random access procedures are executed in parallel on different carriers, then resource utilization efficiency is improved, but confusion and indeterminate behavior occur due to lack of execution order determination
Solution Approach 1:
The patent introduces an intermediary mechanism in the form of a determination step that acts as a mediator between the simultaneous requests and the execution engine. This intermediary determines the execution order based on predefined criteria (such as comparing carrier frequency indices or procedure priorities) and provides a clear sequence to the execution process, eliminating the need for complex conflict resolution mechanisms.
Data Source
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AI summary
A cellular station with a wireless module and a controller module is provided for handling random access procedures in a multi-carrier system. The wireless module performs wireless transceiving to and from a mobile communication device on a first SCell and a second SCell of a timing reference group. The controller module waits for a predetermined period of time subsequent to an expiry of a deactivation timer for the first SCell maintained in the cellular station, and transmits, to the mobile communication device via the wireless module, a PDCCH order for initiating a random access procedure on the second SCell or an activation command for activating the first SCell, in response to the predetermined period of time being elapsed.