Backhaul Link Subframe Configuration for Carrier Aggregation
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
In wireless communication systems employing the carrier aggregation scheme, configuring backhaul link subframes effectively is challenging due to issues like HARQ timing mismatch and signal interference in relay nodes, particularly in TDD systems, which affects the reliability and efficiency of data transmission.
Innovation Solution
A method for configuring backhaul link subframes involves determining a primary subframe configuration for a primary component carrier and configuring candidates for secondary component carriers, ensuring that subframe configurations for both are aligned to prevent HARQ timing mismatch and allow simultaneous transmission and reception by relay nodes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If carrier aggregation scheme is applied to backhaul link, then data transmission capacity is improved, but HARQ timing mismatch and signal interference occur
Solution Approach 1:
The patent applies parameter changes by dynamically adjusting subframe configuration parameters for different component carriers in the carrier aggregation scheme. Specifically, it configures different subframe patterns (e.g., backhaul subframe configurations) for primary and secondary component carriers to align HARQ timing relationships. This allows the system to maintain reliable HARQ operations while achieving enhanced data transmission capacity through carrier aggregation.
2Productivity
If multiple component carriers are configured, then transmission efficiency is improved, but subframe configuration complexity increases
Solution Approach 1:
The patent applies segmentation by dividing the backhaul link configuration into separate component carriers (primary component carrier and secondary component carrier), each with its own subframe configuration pattern. This segmentation allows independent optimization of each carrier while maintaining overall system efficiency. The backhaul subframes are segmented and allocated to different carriers according to specific configuration rules, reducing the complexity of managing multiple carriers simultaneously.
3Productivity
If relay node performs simultaneous transmission and reception, then spectrum efficiency is improved, but signal interference increases
Solution Approach 1:
The patent applies periodic action by implementing time-division multiplexing patterns for backhaul subframes, where transmission and reception occur in periodic alternating intervals. The subframe configuration specifies certain subframes as backhaul downlink subframes and others as backhaul uplink subframes, creating a periodic structure. This allows the relay node to perform simultaneous transmission and reception across different time periods, improving spectrum efficiency while avoiding self-interference through proper timing separation.
Data Source
AI summary
A method for configuring a backhaul link subframe in a wireless communication system to which a carrier aggregation scheme is applied and an apparatus for the same are disclosed. The method comprises determining one of a plurality of subframe configurations as a first subframe configuration for a primary component carrier allocated to the relay node; configuring subframe configuration candidates for one or more secondary component carriers allocated to the relay node on the basis of the determined first subframe configuration; determining a second subframe configuration for each of the one or more secondary component carriers by using the configured subframe configuration candidates; and transmitting and receiving a signal to and from the relay node in accordance with the first subframe configuration and the second subframe configuration.