Frequency Hopping Carrier Aggregation for Interference Mitigation
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Solution Overview
Problem
Wireless communication networks face interference issues due to increased demand for mobile broadband access, leading to degraded performance on both downlink and uplink transmissions, especially in environments with multiple base stations and user equipment (UEs).
Innovation Solution
The method involves receiving a first portion of a downlink transmission on a primary carrier during periodic subframes and a second portion on a secondary carrier, with the secondary carrier being indicated for subsequent subframes, allowing for efficient carrier aggregation and mitigating interference by using protected resources and frequency hopping between primary and secondary carriers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If carrier aggregation is used to increase data transmission capacity, then productivity is improved, but device complexity increases due to the need to manage multiple carriers and frequency hopping
Solution Approach 1:
The downlink transmission is segmented into two portions: the first portion is received on the primary carrier during periodic subframes, and the second portion is received on the secondary carrier during periodic subframes following the primary carrier's periodic subframes. This segmentation allows the system to distribute data transmission across multiple carriers while maintaining manageable complexity through structured reception patterns.
Solution Approach 2:
The system employs periodic subframes with specific patterns on both primary and secondary carriers. The primary carrier transmits during its periodic subframes, and the secondary carrier transmits during its periodic subframes that follow the primary carrier's periodic subframes. This periodic structure simplifies carrier management by creating predictable transmission patterns that reduce the complexity of managing multiple carriers.
2Reliability
If frequency hopping between primary and secondary carriers is implemented to mitigate interference, then reliability is improved, but loss of time occurs due to carrier switching
Solution Approach 1:
The system performs preliminary actions by establishing periodic subframe patterns on both primary and secondary carriers before data transmission begins. The UE is pre-configured with the periodicity and timing relationships between carriers, so when frequency hopping occurs, the switching can be executed efficiently without significant time loss. The periodic structure is set up in advance to enable smooth transitions.
Solution Approach 2:
The system maintains continuous useful action by ensuring that while the UE hops between carriers, there is no interruption in the overall data reception process. The secondary carrier's periodic subframes are scheduled to follow the primary carrier's periodic subframes, creating a continuous transmission flow that minimizes idle time during carrier switching.
3Productivity
If multiple carriers are used for data transmission to increase throughput, then productivity is improved, but object-affected harmful factors increase due to potential interference from other wireless systems
Solution Approach 1:
The system applies local quality by assigning different roles and characteristics to different carriers. The primary carrier is used for control information and periodic transmissions with higher reliability requirements, while the secondary carrier is used for additional data throughput with tolerance for higher interference. This differentiation allows the system to optimize each carrier's usage according to its local conditions and interference profile.
Solution Approach 2:
The system converts the potential harm of interference into a benefit by using carrier aggregation strategically. When the primary carrier experiences interference, the secondary carrier provides an alternative path for data transmission. The interference that would normally degrade performance is transformed into an opportunity to demonstrate the system's resilience and to utilize the secondary carrier's periodic subframes effectively, thereby improving overall throughput through diversified transmission paths.
Data Source
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AI summary
A method of wireless communication includes receiving by a single RF receiver of a user equipment (UE) a first portion of a downlink transmission from an eNode B (eNodeB) on a downlink primary carrier during at least one periodic subframe of the downlink primary carrier. The method also includes receiving by the single RF receiver a second portion of the downlink transmission from the eNodeB on the secondary downlink carrier. The reception occurs during a periodic sequence of subframes of the secondary downlink carrier following the at least one periodic subframe of the downlink primary carrier and before a second periodic subframe of the downlink primary carrier.