Special Scheduling Cell for Dynamic Spectrum Sharing in 5G Networks
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current dynamic spectrum sharing (DSS) techniques in wireless communication networks face limitations, particularly in 5G implementations due to 4G constructions, such as cell reference signal transmissions, cross carrier scheduling, and downlink control information formats, which restrict the benefits, efficiencies, and flexibilities of 5G technology.
Innovation Solution
The introduction of a special scheduling cell (sSCell) configured to schedule a primary cell within a master or secondary cell group, allowing for activation, deactivation, and dormancy management, along with enhanced user-specific search spaces and fallback DCI configurations, to overcome the limitations of current DSS techniques.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If 4G construction methods are used for dynamic spectrum sharing, then compatibility with existing 4G networks is maintained, but 5G performance and flexibility are restricted
Solution Approach 1:
The patent segments the cell group into a master cell group (MCG) and a secondary cell group (SCG), with the PSCell in the SCG functioning as a special scheduling cell. This segmentation allows 5G NR resources to be independently managed and scheduled without being constrained by 4G LTE constructions, thereby improving 5G performance while maintaining overall system compatibility through the dual-cell-group structure.
Solution Approach 2:
The PSCell acts as an intermediary between the 4G network infrastructure and 5G NR services. By positioning the PSCell as a special scheduling cell that can schedule both LTE and NR resources, it mediates the interaction between legacy 4G systems and modern 5G technologies, enabling 5G performance enhancement without requiring complete system replacement.
2Quantity of substance
If cell reference signal transmissions are used in DSS, then legacy 4G compatibility is maintained, but the number of symbols and time locations for 5G control resource sets is restricted
Solution Approach 1:
The patent implements dynamic spectrum sharing where the PSCell can dynamically schedule NR control resource sets (CORESETs) in time locations that do not conflict with 4G cell reference signals. This dynamic allocation allows the system to adaptively determine the number of symbols and time locations for 5G control resources based on current network conditions, increasing both the quantity available for 5G operations and the configuration flexibility.
3Productivity
If cross carrier scheduling is implemented with 4G constructions, then existing scheduling mechanisms are preserved, but scheduling efficiency and flexibility for 5G are limited
Solution Approach 1:
The PSCell is designed with multi-functionality, serving as both a secondary cell for 5G NR connectivity and a special scheduling cell that can schedule resources across both LTE and NR carriers. This universal scheduling capability allows a single cell to perform multiple scheduling functions, improving scheduling efficiency by consolidating control while enhancing flexibility through the ability to adapt scheduling decisions to different 5G service requirements.
4Loss of information
If downlink control information formats from 4G are used, then backward compatibility is maintained, but 5G control information efficiency and capability are restricted
Solution Approach 1:
The patent utilizes NR-specific downlink control information (DCI) formats in the PSCell for scheduling 5G NR resources, rather than relying solely on legacy 4G DCI formats. This parameter change in control information formatting enables more efficient 5G-specific control signaling with enhanced capabilities for NR resource allocation, while the dual-cell-group structure maintains backward compatibility by preserving 4G control mechanisms in the MCG.
Data Source
AI summary
Techniques described herein may include a special scheduling cell (sSCell) provided for dynamic spectrum sharing (DSS). The sSCell may schedule a primary cell of a master cell group (MCG) or a primary cell of a secondary cell group (SCG). The primary cell may be referred to as a special cell or SpCell. The sSCell may be activated and/or deactivated, enter in or exit from a state of dormancy, and radio link monitoring (RLM), beam failure recovery (BFR), and cell grouping parameters may be provided. Techniques described herein include configuring a UE-specific search space (USS) with non-fallback downlink control information (DCI), USS with fallback DCI, and overall search space for DSS enhancement.