Random Access Carrier Selection for Uplink Synchronization
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Solution Overview
Problem
Current wireless communication systems face challenges in efficiently managing random access procedures across multiple component carriers, particularly in maintaining uplink synchronization and ensuring reliable communication links, especially when primary component carriers become unreliable.
Innovation Solution
The method involves selecting an uplink component carrier associated with a primary downlink component carrier for contention-free random access procedures, and using user-equipment-specific signaling to link uplink and downlink component carriers, allowing for the selection of secondary uplink component carriers with similar timing advance values to maintain synchronization and ensure reliable data transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the system uses multiple component carriers for random access procedures, then the capacity and flexibility of the system are improved, but the complexity of managing uplink synchronization and carrier association increases
Solution Approach 1:
The patent segments the component carriers into primary and secondary carriers, with the primary carrier handling critical synchronization functions and secondary carriers handling additional traffic. This segmentation simplifies the management complexity by creating a hierarchical structure where the primary carrier serves as the reference point for synchronization, while secondary carriers can be independently managed based on traffic needs.
Solution Approach 2:
The patent establishes uplink synchronization on the primary component carrier before activating secondary component carriers. This preliminary action ensures that the foundation for synchronization is already in place, reducing the complexity of managing multiple carriers simultaneously. The timing advance value is determined in advance based on downlink timing measurements, allowing for smoother carrier activation.
2Device complexity
If the system relies on primary component carriers for synchronization, then the synchronization management is simplified, but the reliability decreases when primary carriers become unreliable
Solution Approach 1:
The patent prepares backup synchronization mechanisms by establishing the ability to determine timing advance values for secondary component carriers based on downlink timing measurements. This beforehand cushioning ensures that if the primary carrier becomes unreliable, the system already has the capability to maintain synchronization using secondary carriers, thus protecting against reliability failures without adding ongoing complexity.
Solution Approach 2:
The patent uses downlink timing measurements as an intermediary to determine uplink timing advance values. This intermediary approach allows the system to maintain synchronization even when direct uplink-downlink pairing on primary carriers is unavailable. By using downlink timing as a reference to calculate uplink timing, the system creates a reliable indirect path for synchronization that works even when primary carriers fail.
3Adaptability or versatility
If the system allows dynamic selection of uplink component carriers, then the adaptability to different network conditions is improved, but the difficulty of detecting and measuring the appropriate carrier increases
Solution Approach 1:
The patent implements feedback mechanisms where the system continuously monitors the reliability and performance of component carriers. Based on this feedback, the system can dynamically determine which uplink component carrier to use for random access procedures. The feedback loop includes monitoring downlink timing measurements and adjusting the selection of uplink carriers accordingly, making the detection process more systematic and less complex.
Solution Approach 2:
The patent performs preliminary assessment of component carrier conditions before initiating random access procedures. By evaluating downlink timing measurements and carrier reliability in advance, the system pre-determines the most suitable uplink component carrier for each scenario. This preliminary action reduces the real-time detection difficulty by having carrier selection criteria already established based on pre-measured conditions.
Data Source
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AI summary
User equipment, systems, apparatuses, methods and/or computer program products are provided to facilitate random access procedures in a wireless communication network. The selection and utilization of uplink and downlink component carriers for conducting contention-free and contention-based random access procedures is facilitated in a multiple component carrier system, where a user equipment is configured with multiple uplink and downlink component carriers. This Abstract is provided for the sole purpose of complying with the Abstract requirement rules that allow a reader to quickly ascertain the disclosed subject matter. It is therefore to be understood that it should not be used to interpret or limit the scope or the meaning of the claims.