Cross-Carrier Scheduling With CIF-Based BWP Switching
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Solution Overview
Problem
Existing wireless communication systems face challenges in efficiently managing bandwidth parts (BWP) and carrier scheduling, particularly in next-generation mobile communication systems like 5G, which affect resource utilization and power consumption.
Innovation Solution
A method and apparatus for cross-carrier scheduling that involves BWP switching based on configuration information and downlink control information, including the use of a carrier indicator field (CIF) to manage BWPs efficiently across primary and secondary cells, with timers for deactivation and default reversion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If cross-carrier scheduling is implemented with CIF presence field for BWP switching, then radio resource utilization is improved, but device complexity increases
Solution Approach 1:
The patent extracts the carrier indicator function from the traditional scheduling framework and implements it through a dedicated CIF presence field in the DCI format. This allows the system to identify which carrier the scheduling information applies to, enabling efficient cross-carrier scheduling while maintaining clear separation of functions.
Solution Approach 2:
The downlink control information format is designed to be universal across multiple carriers by incorporating the CIF presence field. This single DCI format can schedule resources on different carriers (PCell or SCell) depending on the CIF configuration, eliminating the need for separate scheduling mechanisms for each carrier.
2Productivity
If BWP switching is performed frequently to optimize resource allocation, then system efficiency is improved, but power consumption increases
Solution Approach 1:
The patent implements dynamic BWP switching by allowing the network to configure different BWPs for different carriers and to switch between them based on traffic conditions. The CIF presence field enables dynamic indication of which carrier's BWP should be activated, allowing flexible adaptation to changing system conditions without unnecessary switching.
Solution Approach 2:
The system changes the BWP configuration parameters dynamically by receiving DCI with CIF presence field indications. When the CIF presence field is set, it triggers a BWP switch to the indicated carrier's configured BWP, allowing the system to optimize resource allocation by adjusting bandwidth parameters according to actual traffic needs rather than maintaining fixed high bandwidth continuously.
3Adaptability or versatility
If CIF presence field is configured for both PCell and SCell, then scheduling flexibility is improved, but control information overhead increases
Solution Approach 1:
The patent applies local quality by configuring the CIF presence field selectively rather than uniformly across all carriers. The network can configure CIF presence for SCell to enable cross-carrier scheduling from PCell, while PCell may not require CIF configuration since it is the primary scheduling carrier. This localized application of CIF configuration optimizes flexibility where needed while minimizing overhead elsewhere.
Data Source
AI summary
A method performed by a terminal in a wireless communication system includes receiving configuration information for a secondary cell (SCell), identifying whether a carrier indicator field (CIF) presence field is included in the configuration information for the SCell, receiving downlink control information for at least one other cell through the SCell based on identifying that a CIF presence field is included in the configuration information for the SCell, and performing bandwidth part (BWP) switching for the at least one other cell based on the downlink control information.