sSCell Scheduling SpCell in LTE-NR DSS
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Solution Overview
Problem
Current cross carrier scheduling (CCS) technologies face limitations in NR scheduling flexibility and control reliability due to restrictions such as no cross Cell Group scheduling, where Primary Cell (PCell) can only be scheduled by itself, and only one Radio Resource Control (RRC) can be configured for each scheduled cell, hindering the effectiveness of special Secondary Cell (sSCell) in scheduling special Primary Cell (SpCell).
Innovation Solution
A cellular base station generates control information based on specific criteria to support sSCell scheduling SpCell, including Type3-PDCCH CSS configuration, SCell dormancy behavior, scheduling restrictions, USS configuration, and interaction with Multi-DCI Multi-TRP operation, enabling sSCell to schedule SpCell within the same Cell Group.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If cross carrier scheduling is implemented with traditional restrictions, then control reliability is maintained through simple scheduling rules, but NR scheduling flexibility is significantly limited
Solution Approach 1:
The patent segments the scheduling restriction rules into specific categories: SpCell scheduling restrictions, sSCell scheduling permissions, and Cell Group boundary conditions. This segmentation allows the system to maintain control reliability through structured rules while enabling NR scheduling flexibility by clearly defining where and how cross-carrier scheduling can occur without overwhelming complexity.
Solution Approach 2:
The patent introduces dynamic scheduling capabilities where an sSCell can dynamically schedule an SpCell under defined conditions. This dynamic approach replaces static scheduling restrictions with adaptive scheduling decisions, allowing the system to flexibly allocate resources while maintaining control through configured parameters and restrictions.
2Productivity
If PCell is restricted to self-scheduling only, then control reliability is ensured through simple scheduling logic, but scheduling efficiency and resource allocation flexibility are reduced
Solution Approach 1:
The patent introduces an intermediary scheduling mechanism where an sSCell acts as a mediator to schedule an SpCell. This intermediary approach allows the PCell to be scheduled by another cell under specific conditions, improving scheduling efficiency and resource allocation while maintaining control reliability through configured restrictions and parameters.
3Adaptability or versatility
If only one RRC is configured for each scheduled cell, then configuration simplicity is maintained, but scheduling versatility and cross-cell-group scheduling capability are limited
Solution Approach 1:
The patent implements a universal scheduling framework where an sSCell can schedule an SpCell across Cell Group boundaries under defined conditions. This multi-functionality allows a single RRC configuration to support both intra-group and inter-group scheduling, enhancing versatility while managing complexity through structured permission rules and configuration parameters.
Data Source
AI summary
Apparatuses, systems, and methods for supporting cross carrier scheduling in LTE and NR dynamic spectrum sharing (DSS). A cellular base station may generate control information in accordance with a set of criteria, wherein the set of criteria supports a special Secondary Cell (sSCell) which is a Secondary Cell (SCell) in scheduling a special Primary Cell (SpCell) which is either a Primary Cell (PCell) or a Primary Secondary Cell (PSCell). The cellular base station sends the control information to a wireless device. The control information may be associated with Type3-PDCCH CSS configuration including DCI Format 2_5 and 2_6, SCell dormancy behavior, scheduling restrictions, USS configuration including non-fallback and fallback DCI Formats, and interaction with Multi-DCI Multi-TRP operation. After receiving the control information, the wireless device may conduct corresponding performance.