Base Station Control Sizing for Fewer Carrier Aggregation Blind Detections
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Solution Overview
Problem
In LTE-A systems with asymmetric carrier aggregation, reducing the number of blind detections for assignment control information without causing reception issues for both LTE-A and LTE terminals is challenging, especially when uplink and downlink component bands have different bandwidths.
Innovation Solution
A radio base station and terminal configuration that forms a component band group with uplink and downlink bands, using a common search space and user equipment-specific search space, adjusts information sizes based on the larger bandwidths of associated component bands to align sizes for blind detection, and employs zero padding to equalize sizes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If zero padding is applied to equalize information sizes of downlink and uplink assignment control information, then the number of blind detections is reduced, but the circuit scale of the terminal increases when downlink transmission bandwidth is wide
Solution Approach 1:
The patent applies different information size adjustment methods to different search spaces based on their specific requirements. The common search space uses adjustment based on downlink component band bandwidth, while the UE-specific search space uses adjustment based on uplink component band bandwidth. This localized differentiation allows each search space to be optimized for its specific function, reducing unnecessary blind detections in the common search space while maintaining efficient UE-specific communication.
Solution Approach 2:
The patent segments the PDCCH into two distinct search spaces: common search space and UE-specific search space. Each search space has its own information size adjustment rules tailored to its specific usage patterns. This segmentation allows the system to optimize blind detection efficiency in the common search space without unnecessarily increasing circuit complexity for UE-specific communications.
2Reliability
If information size is adjusted based on downlink bandwidth for common search space, then LTE terminals can receive broadcast signals, but blind detection efficiency for LTE-A terminals is reduced
Solution Approach 1:
The patent applies different information size adjustment methods to different search spaces based on their specific requirements. The common search space uses adjustment based on downlink component band bandwidth, while the UE-specific search space uses adjustment based on uplink component band bandwidth. This localized differentiation allows each search space to be optimized for its specific function, reducing unnecessary blind detections in the common search space while maintaining efficient UE-specific communication.
Solution Approach 2:
The patent segments the PDCCH into two distinct search spaces: common search space and UE-specific search space. Each search space has its own information size adjustment rules tailored to its specific usage patterns. This segmentation allows the system to optimize blind detection efficiency in the common search space without unnecessarily increasing circuit complexity for UE-specific communications.
Data Source
AI summary
A base station communicates with a terminal, for which an uplink component carrier and downlink component carriers are configured. The base station adjusts a payload size of control information, transmitted in a downlink control channel, based on a basic payload size, and maps the control information onto a search space in at least one of the downlink component carriers. The basic payload size of the control information mapped onto a search space in a primary downlink component carrier is based on a number of information bits obtained from a bandwidth of the primary downlink component carrier, and on a number of information bits obtained from a bandwidth of the uplink component carrier. The basic payload size of the control information mapped onto a search space in a non-primary downlink component carrier is based on a number of information bits obtained from a bandwidth of the non-primary downlink component carrier.