Cross-Carrier Scheduling for LTE-5G NR Dynamic Spectrum Sharing
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Solution Overview
Problem
In dual deployment scenarios of LTE and 5G NR, dynamic spectrum sharing introduces complications in effectively utilizing radio resources due to potential collisions between LTE and 5G NR control transmissions, limiting scheduling flexibility and control reliability.
Innovation Solution
Implementing cross-carrier scheduling techniques where a secondary cell in the 5G NR connection provides downlink control information to avoid collisions with LTE control transmissions, and offloading 5G NR DCI to prevent interference, allowing for selective common search space and DCI format handling between primary and secondary cells.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If spectrum is shared between LTE and 5G NR, then spectrum utilization is improved, but control transmission collisions increase
Solution Approach 1:
The patent segments the control transmission functions by introducing a secondary cell that handles 5G NR DCI transmissions separately from the primary cell that handles LTE control transmissions. This segmentation prevents collisions between LTE and 5G NR control signals while maintaining spectrum sharing, as each cell type operates with dedicated control resources.
2Adaptability or versatility
If cross-carrier scheduling is implemented, then scheduling flexibility is improved, but system complexity increases
Solution Approach 1:
The patent introduces a secondary cell as an intermediary that mediates between the primary cell and the UE for control information transmission. The secondary cell carries DCI formats that schedule resources on the primary cell, enabling flexible cross-carrier scheduling while managing complexity through standardized DCI structures and clear role definition.
Data Source
AI summary
Methods and devices for a base station acting as a primary cell to perform dual spectrum sharing (DSS) with a first user equipment device (UE) over a 5G NR connection and a second UE over an LTE connection. The first UE establishes the 5G NR connection with the primary cell and one or more secondary cells. One of the secondary cells is configured in the 5G NR connection to provide downlink control information to the UE for the primary cell, to avoid collisions by the primary cell with LTE control transmissions.