Secondary Cell Scheduling for 5G Primary Cells
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Solution Overview
Problem
In 5G wireless communication systems, the scheduling performance of primary cells (Pcells) and primary secondary cells (PScells) deteriorates due to the presence of multiple user equipment (UEs) on the same frequency resources, leading to inefficiencies in resource allocation and communication reliability.
Innovation Solution
Introducing a secondary cell (Scell) that can substitutionally perform scheduling of Pcells or PScells, allowing for separate configuration of user-specific and common search spaces, and modifying downlink control information (DCI) to enable efficient scheduling even in high-UE density scenarios.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If multiple user equipment (UEs) share the same frequency resources on primary cells (Pcells) and primary secondary cells (PScells), then frequency resource utilization is improved, but scheduling performance deteriorates
Solution Approach 1:
The patent divides the scheduling function into two parts: the Pcell/PScell handles common scheduling, while the Scell handles user-specific scheduling. This segmentation allows multiple UEs to share frequency resources on Pcells without compromising scheduling performance, as the Scell provides dedicated scheduling resources for each UE.
Solution Approach 2:
The Scell acts as an intermediary between the Pcell and the UE for scheduling purposes. By introducing the Scell as a mediator that provides user-specific search spaces and scheduling information, the system can maintain multiple UEs on the same Pcell frequency resources while preserving individual scheduling performance through the Scell's dedicated control channels.
2Reliability
If a secondary cell (Scell) is introduced to perform substitutional scheduling of Pcells or PScells, then scheduling performance is maintained, but device complexity increases
Solution Approach 1:
The Scell is configured to serve multiple functions: it maintains its own scheduling role while simultaneously providing substitutional scheduling for the Pcell or PScell. This multi-functionality allows the system to maintain scheduling performance without requiring entirely separate scheduling mechanisms, thereby managing complexity more effectively.
Solution Approach 2:
The patent introduces a new dimension to the cell structure by adding the Scell that operates in parallel with the Pcell/PScell scheduling. Instead of modifying the existing Pcell scheduling mechanism (which would increase complexity), the solution adds a new scheduling dimension through the Scell, allowing independent user-specific search spaces and scheduling information to coexist with common scheduling.
3Productivity
If user-specific and common search spaces are separately configured on Scell, then scheduling efficiency in high-UE density scenarios is improved, but control information overhead increases
Solution Approach 1:
The patent applies local quality by configuring user-specific search spaces and common search spaces separately on the Scell. This allows different regions of the control information structure to serve different purposes: common search spaces for general scheduling and user-specific search spaces for individual UE scheduling. This localized differentiation improves scheduling efficiency in high-UE density scenarios while managing overhead through targeted configuration.
Data Source
AI summary
The present disclosure relates to a 5th generation (5G) or 6th generation (6G) communication system for supporting a higher data transmission rate. According to an embodiment of the present disclosure, a method performed by a user equipment (UE) in a wireless communication system may be provide. The method may include: receiving, from a base station (BS), configuration information about cross carrier scheduling (CCS); when CCS from a secondary cell (Scell) to a primary cell (Pcell) or a primary Scell (PScell) is configured via the configuration information, monitoring a physical downlink control channel (PDCCH) of the Scell or a PDCCH of the Pcell or the PScell; and identifying scheduling information about the Pcell or the PScell, based on the monitoring.