Cross-Carrier Scheduling via Carrier Indicator Field
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Solution Overview
Problem
The existing wireless communication systems face challenges in efficiently managing radio resources, particularly in overcoming scheduling restrictions imposed by a lack of radio resources, which can lead to cell capacity shortages.
Innovation Solution
The proposed method involves cross-carrier scheduling between a secondary cell (SCell) and a primary cell (PCell), where the user equipment (UE) receives configuration information for cross-carrier scheduling from the base station and identifies the scheduling type based on the carrier indicator field (CIF) in the physical downlink control channel (PDCCH).
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If cross-carrier scheduling is implemented to overcome radio resource scarcity, then cell capacity is enhanced, but device complexity increases due to CIF monitoring and scheduling type identification
Solution Approach 1:
The patent introduces the Carrier Indicator Field (CIF) as an intermediary element within the PDCCH structure. This CIF acts as a mediator that carries scheduling information indicating whether cross-carrier or self-carrier scheduling is being used, allowing the UE to automatically identify the scheduling type without complex external configuration or manual determination, thus resolving the technical contradiction by enhancing cell capacity while managing device complexity through an integrated field-based approach
2Adaptability or versatility
If cross-carrier scheduling is used to optimize radio resource utilization, then scheduling flexibility is improved, but signal detection difficulty increases due to PDCCH monitoring on multiple carriers
Solution Approach 1:
The patent implements a universal PDCCH structure that can serve multiple functions: it can schedule both cross-carrier and self-carrier operations using the same physical channel. The CIF within the PDCCH provides scheduling information that enables the UE to interpret the same PDCCH structure for different scheduling types, thereby achieving scheduling flexibility while maintaining consistent PDCCH detection procedures across carriers, which reduces the difficulty of signal detection
Data Source
AI summary
The disclosure relates to a 5th generation 5G or 6th generation (6G) communication system for supporting a higher data transmission rate. A method of a base station in a wireless communication system is provided. The method includes transmitting, to a user equipment (UE), configuration information for configuring cross-carrier scheduling from a secondary cell (SCell) to a primary cell (PCell), transmitting, to the UE, at least one downlink control information (DCI), the at least one DCI including a carrier indicator field (CIF), and performing scheduling based on the at least one DCI.