Cross Cell Offloading for LTE-NR Dynamic Spectrum Sharing
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Solution Overview
Problem
Current LTE-NR Dynamic Spectrum Sharing (DSS) deployments face limitations due to restricted control channel capacity, particularly when a serving cell acts as a Primary Cell (PCell), leading to reduced PDSCH capacity and requirements for additional features, as it must broadcast System Information (SI) and paging messages over scarce common control channels.
Innovation Solution
The solution involves enabling the offloading of System Information and paging messages from a serving cell to another cell of the same or different radio access technology, allowing partial or total offloading, and configuring control messages to prioritize messages based on high reliability or low latency services, using interfaces like X2 and Xn for communication.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a serving cell acts as a Primary Cell and broadcasts System Information and paging messages over common control channels, then the cell provides essential network information to user equipment, but the control channel capacity becomes restricted and PDSCH capacity is reduced
Solution Approach 1:
The patent segments the broadcasting function by dividing System Information and paging messages into different cells. The serving cell broadcasts only essential information, while less critical information is offloaded to a neighboring cell, thereby reducing control channel overhead and freeing up PDSCH capacity in the serving cell.
Solution Approach 2:
The patent extracts certain System Information blocks and paging messages from the serving cell's control channel burden and relocates them to be broadcast by a neighboring cell. This extraction reduces the control channel capacity consumption at the serving cell while maintaining network information availability.
2Loss of information
If a serving cell broadcasts all System Information and paging messages, then complete information is available to user equipment, but control channel overhead increases and resource utilization deteriorates
Solution Approach 1:
The patent segments System Information into multiple parts, with SIB1 and critical SIBs broadcast by the serving cell and less critical SIBs offloaded to a neighboring cell. This segmentation maintains information completeness while reducing control channel overhead at the serving cell.
Solution Approach 2:
The patent introduces a spatial dimension to information broadcasting by utilizing a neighboring cell's resources. Instead of all information coming from one cell, information is distributed across multiple cells in space, reducing the overhead burden on any single cell's control channels.
3Productivity
If control messages are prioritized based on high reliability or low latency services, then message scheduling efficiency improves, but system complexity increases
Solution Approach 1:
The patent applies local quality by assigning different priorities to different System Information blocks and paging messages based on their specific requirements. Critical SIBs receive higher priority for immediate broadcasting, while less critical SIBs can be offloaded with lower priority, optimizing scheduling efficiency without uniform complexity increase.
Solution Approach 2:
The patent changes the priority parameter of different control messages based on service requirements. By dynamically adjusting priority levels and offloading decisions based on message importance, the system achieves efficient scheduling while managing complexity through parameter-based differentiation rather than structural complexity.
Data Source
AI summary
There is at least a method and apparatus to offload to or receive an offload at least one other cell of a same or different radio access technology at least one beam of more than one beam associated with at least one user equipment of the cell; and based on the determining, forwarding or receiving information including at least one control message identifying the at least one beam associated with the at least one user equipment of the cell to the at least one other cell to perform the offload to the cell, and to perform receiving, by user equipment of a cell of a communication network, from another cell of a same or different radio access technology information.