Mobile Station Random Access Procedure Switching
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Solution Overview
Problem
In Advanced EUTRA, the random access procedure is performed only in the primary cell, which limits synchronization of uplink in secondary cells when transmission and reception timings differ between primary and secondary cells.
Innovation Solution
A communication system that allows the mobile station device to switch between two random access procedures based on the presence and activation status of secondary cells, using the carrier indicator field in the downlink control channel to select the appropriate cell for random access, ensuring efficient random access even when secondary cells have different timings.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the random access procedure is performed only in the primary cell, then the system complexity is reduced and compatibility with EUTRA is maintained, but synchronization of uplink in secondary cells cannot be established when transmission and reception timings differ between primary and secondary cells
Solution Approach 1:
The patent applies dynamics by making the random access procedure configurable and adaptable based on system conditions. The base station can dynamically determine whether to perform random access in primary or secondary cells based on timing differences and operational requirements, allowing the system to transition between different operational modes as needed.
Solution Approach 2:
The patent segments the random access procedure into cell-specific operations. Instead of a unified random access approach, the system can independently perform random access in primary cells or secondary cells based on specific requirements, allowing differentiated handling of synchronization needs in different cell types.
2Productivity
If the mobile station device always performs random access in the primary cell, then the random access procedure is simplified, but efficient random access cannot be achieved in cells with different timings
Solution Approach 1:
The patent applies local quality by allowing different random access characteristics in different cells. Secondary cells can have their own random access parameters and timing configurations independent of the primary cell, enabling optimized random access performance in each cell based on local timing conditions and operational requirements.
Solution Approach 2:
The mobile station device dynamically selects which cell to perform random access in based on received indications from the base station. This dynamic selection allows the system to adapt to changing conditions and optimize random access efficiency for different cell types and timing scenarios.
3Adaptability or versatility
If the mobile station device switches between different random access procedures based on secondary cell configuration, then random access efficiency in cells with different timings is improved, but the device complexity increases
Solution Approach 1:
The patent implements feedback mechanisms where the base station provides indications to the mobile station device about which random access procedure to use. This feedback loop allows the mobile station to adapt its behavior based on network conditions and base station decisions, achieving high adaptability while the base station manages the complexity of procedure selection.
Solution Approach 2:
The mobile station device is designed with multi-functionality to support multiple random access procedures. The device can handle both traditional primary cell random access and new secondary cell random access procedures, making it universally compatible with different operational modes without requiring separate dedicated hardware for each mode.
Data Source
AI summary
A base station device uses a downlink control channel and instructs a mobile station device to perform a random access procedure. The mobile station device switches, according to whether or not random access parameters are included in parameters of a secondary cell that has been allocated to the mobile station device, between a first random access procedure in which information in a carrier indicator field included in the downlink control channel is not used for selection of a cell in which a random access procedure is performed, and a second random access procedure in which information in the carrier indicator field included in the downlink control channel is used for selection of a cell in which a random access procedure is performed.