Multi-Cell DCI Scheduling for PDCCH Overbooking Control
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Solution Overview
Problem
The issue of overbooking in a primary cell's user equipment-specific search space (USS) exceeds the upper limit due to the introduction of multi-cell scheduling downlink control information (DCI) formats, leading to challenges in managing physical downlink control channel (PDCCH) candidates and control channel elements (CCEs).
Innovation Solution
A method and apparatus for a terminal device to determine the allocation of PDCCH candidates based on blind detection capability counting, allowing flexible configuration of the USS by considering whether the multi-cell scheduling DCI format is on the primary cell, and a network device to perform overbooking when the primary cell exceeds the BD or CCE upper-limits.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multi-cell scheduling DCI format is introduced, then scheduling capability is improved, but PDCCH candidate allocation complexity increases
Solution Approach 1:
The patent changes the parameter of blind detection capability counting location from fixed (always on primary cell) to variable (can be on primary cell or secondary cell based on configuration). This allows flexible adaptation to different scheduling scenarios while managing complexity through parameter adjustment rather than structural changes.
Solution Approach 2:
The patent introduces dynamic configuration where the network device can indicate whether blind detection capability counting is performed on the primary cell or secondary cell. This dynamic approach allows the system to adapt to different multi-cell scheduling scenarios, improving versatility while managing complexity through configurable parameters.
2Productivity
If overbooking is performed on USS, then resource utilization is improved, but compliance with upper-limits deteriorates
Solution Approach 1:
The patent applies partial overbooking by allowing the sum of PDCCH candidates in USS and CSS to exceed the upper limit only when specifically configured by the network device. The terminal device monitors based on the configured quantity, which may be greater than the upper limit, achieving partial excessive action that improves resource utilization while maintaining controlled compliance.
Solution Approach 2:
The network device acts as an intermediary that configures and indicates the blind detection capability counting location and PDCCH candidate quantities. This intermediary control mechanism allows overbooking to be performed in a controlled manner, balancing resource utilization improvement with compliance requirements through centralized configuration.
3Device complexity
If blind detection capability counting is always on primary cell, then system simplicity is improved, but flexibility in multi-cell scheduling deteriorates
Solution Approach 1:
The patent transforms the static blind detection capability counting location (always on primary cell) into a dynamic configuration that can be set to either primary cell or secondary cell based on network device indication. This dynamic approach provides flexibility for multi-cell scheduling while maintaining system simplicity through a unified configuration mechanism.
Solution Approach 2:
The patent makes the blind detection capability counting location universal by allowing it to be configured on either primary or secondary cells. This multi-functionality enables the system to handle different multi-cell scheduling scenarios appropriately, improving adaptability while maintaining a simple underlying mechanism through configurable parameters.
Data Source
AI summary
Communication method and communication apparatus. In a scenario of a multi-cell scheduling DCI format, a network device determines whether a reference cell of the multi-cell scheduling DCI format is a primary cell, and sends the configuration to a terminal device. The terminal device determines, depending on whether the reference cell of the multi-cell scheduling DCI format is a primary cell, whether to use overbooking processing.