Composite Control Channel Layout for Flexible Radio Resource Assignment
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Solution Overview
Problem
Current wireless communication systems face inefficiencies in resource allocation and signaling for shared channels, particularly in LTE networks, where the fixed frame duration and separate control channel elements lead to excessive capacity and inadequate resource assignment flexibility, especially for UEs with varying packet sizes.
Innovation Solution
The implementation of a composite control channel with multiple control channel elements, each containing radio resource assignment information, allows for dynamic allocation and combination of resources based on channel conditions and UE-specific needs, using type indicators and bit sequences to determine the number and type of control channel elements, enabling efficient resource management across different sub-carriers and frequencies.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If separate control channel elements are used for downlink and uplink assignments, then control information can be transmitted over the first few symbols of the downlink frame, but the capacity becomes excessive and resource assignment flexibility is reduced
Solution Approach 1:
The patent combines separate downlink and uplink control channel elements into a single composite control channel element. This merging reduces the total control channel capacity from excessive levels to appropriate levels while maintaining the ability to convey both downlink and uplink resource assignments, thereby restoring resource assignment flexibility for UEs with varying packet sizes.
2Productivity
If control information is transmitted over the first few symbols of the downlink frame, then downlink data transmission can be scheduled, but the fixed frame duration of approximately 0.5 ms limits adaptability
Solution Approach 1:
The patent introduces dynamic control channel elements that can be adaptively configured within the downlink frame. Instead of fixed control channel positions, the system dynamically determines the number and location of control channel elements based on traffic conditions and UE requirements, enabling flexible resource assignment while maintaining efficient downlink data transmission scheduling.
3Loss of information
If multiple control channel elements are used, then resource assignment information can be conveyed, but decoding complexity increases
Solution Approach 1:
The patent segments the composite control channel element into distinct downlink and uplink assignment fields with clear delimiters. This segmentation allows the UE to efficiently parse only the relevant portion of the control channel element based on its configuration, reducing decoding complexity while maintaining complete resource assignment information for both downlink and uplink transmissions.
Data Source
AI summary
A method in a wireless communication device including receiving (410) a composite control channel including at least two control channel elements, each control channel element only contains radio resource assignment information, for example, a codeword, exclusively addressed to a single wireless communication entity. The device combines (420) at least two of the control channel elements, and decodes (430) the combined control channel elements.