Carrier Aggregation Control Signal Segmentation
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Solution Overview
Problem
Wireless communication systems face challenges in effectively transmitting and receiving signals in scenarios where multiple carriers with different types are aggregated, particularly in terms of scheduling information and control signal management.
Innovation Solution
A method and apparatus for a user equipment (UE) to receive control information by distinguishing between different types of downlink control information (DCI) formats across aggregated carriers, where grant information is received through specific carriers based on the type of DCI format, and configuring blind decoding numbers to ensure efficient signal transmission and reception.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If grant information is received through multiple carriers with different DCI formats, then scheduling flexibility and carrier aggregation efficiency are improved, but device complexity and signal processing burden increase
Solution Approach 1:
The patent segments DCI formats into two distinct types: first type DCI formats (e.g., downlink dedicated and common DCI formats) that include resource allocation information, and second type DCI formats (e.g., uplink dedicated and common DCI formats) that do not include resource allocation information. This segmentation allows the UE to process different DCI formats differently, reducing the overall processing burden while maintaining scheduling flexibility across multiple carriers.
Solution Approach 2:
The patent implements dynamic carrier indication by configuring specific carriers for different DCI format types through higher layer signaling. The UE can dynamically adapt its reception behavior based on the DCI format type received, switching between monitoring multiple carriers for first type DCI formats and monitoring specific carriers for second type DCI formats, thereby optimizing processing efficiency.
2Reliability
If blind decoding is performed on all carriers for all DCI formats, then scheduling information reception reliability is improved, but processing time and complexity increase
Solution Approach 1:
The patent divides blind decoding operations into two segments: for first type DCI formats, the UE performs blind decoding on multiple carriers to ensure reliable reception of scheduling information; for second type DCI formats, the UE performs blind decoding only on specifically configured carriers. This segmented approach maintains reliability for critical scheduling information while reducing processing time for less critical control information.
Solution Approach 2:
The patent applies different blind decoding strategies to different carriers based on their roles and the DCI format types they carry. Carriers configured for second type DCI formats receive targeted blind decoding attention, while other carriers focus on first type DCI format reception. This local quality differentiation optimizes the balance between reliability and processing efficiency.
3Adaptability or versatility
If cross carrier scheduling is implemented, then resource allocation flexibility is improved, but control signal management complexity increases
Solution Approach 1:
The patent segments the control signal management by distinguishing between first type DCI formats that carry resource allocation information (requiring comprehensive monitoring) and second type DCI formats that do not (allowing targeted monitoring). This segmentation simplifies cross-carrier scheduling management by reducing the scope of monitoring required for certain control signals while maintaining flexibility for resource allocation.
Solution Approach 2:
The patent introduces higher layer signaling as an intermediary mechanism to configure the relationship between DCI format types and specific carriers. This intermediary layer provides explicit guidance to the UE on which carriers to monitor for which DCI format types, thereby reducing the complexity of cross-carrier scheduling management while preserving resource allocation flexibility.
Data Source
AI summary
The present invention relates to a wireless communication system. More particularly, the present invention relates to a method and an apparatus for receiving control information in a wireless communication system in which a first carrier type and a second carrier type are aggregated. The method comprises a step of receiving grant information for signal transmission on the second carrier type, wherein the grant information is received through the second carrier type if the grant information includes a first downlink control information (DCI) format, wherein the grant information is received through the first carrier type if the grant information includes a second DCI format.