Control Channel Resource Segmentation for Blind Decoding Reduction
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Solution Overview
Problem
In wireless communication systems, particularly in LTE, the increasing number of blind decodings required for control channel management leads to higher complexity and power consumption in user equipment, especially with features like carrier aggregation and MIMO, necessitating a method to reduce the number of blind decodings and hardware complexity.
Innovation Solution
The introduction of an offset between different sets of resources in a search space to minimize blind detections and prevent blocking, allowing for efficient assignment of PDCCHs with distinct sizes in the same subframe control region without complete overlap, thereby reducing the number of blind decodings and maintaining low PDCCH assignment blocking rates.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the number of control channel types and search spaces is increased to support carrier aggregation and MIMO, then the adaptability and versatility of the system is improved, but the device complexity and power consumption increase due to more blind decodings required
Solution Approach 1:
The patent segments the search space into multiple distinct sets, each associated with specific control channel message types. By dividing the search space into separate resource subsets for different DCI format types, the system enables targeted blind decoding attempts rather than exhaustive searching across all possibilities, thereby reducing complexity while maintaining support for multiple carriers and MIMO modes
Solution Approach 2:
The patent establishes predetermined associations between control channel message types and their corresponding resource sets before actual transmission. The user equipment is pre-configured with knowledge of which resource subsets to monitor for specific message types, allowing it to perform blind decodings only in predetermined locations rather than searching the entire control region, thus reducing complexity while supporting enhanced features
2Productivity
If multiple control channel message types with distinct sizes are assigned to the same resource locations, then the productivity and resource utilization is improved, but the reliability decreases due to self-blocking and blocking issues during multiple scheduling grants
Solution Approach 1:
The patent divides the control channel resources into separate resource subsets, with each subset dedicated to specific control channel message types. This segmentation prevents different message types from competing for the same resource locations, eliminating self-blocking issues while maintaining efficient resource utilization through targeted allocation
Solution Approach 2:
The patent introduces an additional dimension of resource organization by creating multiple distinct resource subsets along the message type dimension. Instead of overlapping resources in the same space, the system distributes resources across different subsets, allowing simultaneous transmission of multiple control channels without interference or blocking
Data Source
AI summary
There is provided a communication device and a base unit, and methods thereof, for determining control information. The communication device receives a control channel message associated with the communication device in a control region on a first carrier from a base unit. The communication device also determines a set of resources in a search space within the control region, attempts to decode the set of resources in the search space for the control channel message, and determines control information from the decoded control channel message. The base unit generates a control channel message comprising control information associated with the communication device, determines a set of resources in a search space within a control region, selects a subset of resources within the determined set of resources for transmitting the control channel message, and transmits the control channel message on the selected resources in the control region on a first carrier.