Mobile Station Random Access Problem Detection in Multi-Carrier Uplink
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Solution Overview
Problem
In Advanced EUTRA, when a mobile station apparatus uses multiple component carriers for uplink communication, detecting random access problems efficiently is challenging, leading to wasted time in uplink data transmission, as existing methods require waiting for completion of random access procedures across all carriers before reestablishment processing can be initiated.
Innovation Solution
A mobile station apparatus employs a counter to track the number of random access channel transmissions, specifically setting a counter for a master component carrier or forming groups of component carriers to promptly detect random access problems and initiate reestablishment processing when a predetermined maximum number of transmissions is reached.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the mobile station waits for completion of random access procedures of all component carriers before detecting random access problems, then the detection accuracy is improved, but the time until uplink data transmission is wasted increases
Solution Approach 1:
The patent segments the component carriers into groups and performs random access problem detection on a per-group basis rather than waiting for all carriers. This allows earlier detection and reestablishment processing to begin on non-problematic groups, reducing overall time loss while maintaining reliable detection through systematic group-based monitoring.
Solution Approach 2:
The patent initiates reestablishment processing as soon as a random access problem is detected on any component carrier group, rather than waiting for all procedures to complete. This preliminary action on affected groups while continuing procedures on other groups reduces the time until uplink data transmission can resume.
2Measurement precision
If a separate counter is used for each component carrier to track random access transmissions, then the measurement precision is improved, but the device complexity increases
Solution Approach 1:
The patent merges the counting function by using a single counter that tracks random access transmission attempts across all component carriers. This single counter approach maintains measurement precision by accurately tracking total attempts while significantly reducing device complexity compared to managing separate counters for each carrier.
Solution Approach 2:
The single counter serves multiple functions by tracking random access transmissions across all component carriers universally. This multi-functional counter reduces complexity while maintaining the ability to detect random access problems accurately by monitoring the aggregate transmission count against a threshold.
Data Source
AI summary
A terminal device includes a transmitter that transmits a random access preamble, a higher layer processor that configures, based on a higher layer signal, a first identity corresponding to a first component carrier group and a second identity corresponding to a second component carrier group; a counter that, in a case that two or more component carriers are configured for an uplink, counts a number of transmission of the random access preamble; and a medium access control (MAC) layer processor that indicates a random access problem to an upper layer in a case that the number exceeds a maximum number of transmission of the random access preamble on a master component carrier of the first component carrier group or a master component carrier of the second component carrier group.