Geographic BWP Assignment for TN-NTN Spectrum Overlap
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Solution Overview
Problem
The challenge of overlapping spectrum utilization between Terrestrial Networks (TNs) and Non-Terrestrial Networks (NTNs) in 5G wireless communication systems, particularly in adjacent bands, leads to interference and inefficient resource allocation.
Innovation Solution
The implementation of Bandwidth Part (BWP) management techniques that assign non-overlapping BWPs for NTN and TN operations, allowing for seamless switching and coordination of BWPs based on UE movement and geographic areas, using Layer 1 Downlink Control Information (DCI) or higher layer RRC signaling to optimize throughput, channel quality, and minimize interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If NTN and TN operate in adjacent spectrum bands, then spectrum utilization is improved, but interference between networks occurs
Solution Approach 1:
The spectrum band is segmented into multiple Bandwidth Parts (BWPs), each assigned to specific geographic areas. This segmentation allows different parts of the spectrum to be used by NTN and TN in different locations, enabling coexistence while maximizing overall spectrum utilization.
Solution Approach 2:
Different BWPs are assigned to different geographic areas based on local network requirements. Each area can have customized BWP assignments that optimize performance for local conditions while avoiding interference with neighboring areas.
2Object-affected harmful factors
If BWPs are assigned to geographic areas to avoid interference, then interference is minimized, but network complexity increases
Solution Approach 1:
The BWP assignment mechanism serves multiple functions simultaneously: it avoids interference between NTN and TN, enables seamless UE mobility handovers, and optimizes spectrum utilization. This multi-functionality reduces the need for separate mechanisms for each objective.
Solution Approach 2:
The network controller acts as an intermediary that manages BWP assignments and handovers. It coordinates between NTN and TN operations, making complex interference avoidance and mobility management transparent to UEs and individual base stations.
3Reliability
If multiple candidate BWPs are maintained for handover, then handover smoothness is improved, but resource overhead increases
Solution Approach 1:
Multiple candidate BWPs are pre-configured and made available to UEs before handover is needed. This preliminary preparation ensures that when handover is required, the UE can immediately switch to a pre-approved BWP without delay or additional signaling overhead.
Data Source
AI summary
Methods and systems for operating a Non-Terrestrial Network (NTN) within neighboring geographic areas, and where a Terrestrial Network (TN) is also operating in at least one of the areas. A set of two or more candidate Bandwidth Parts (BWPs) are selected for use by the NTN from spectrum allocated for use by the NTN which does not overlap with the channels used by the TN. The two or more BWPs may each specify a contiguous set of frequencies and timeslots. One of the candidate BWPs is assigned for use by the NTN as an active BWP in a first one of the neighboring geographic areas; and one candidate BWPs is also assigned for use by the UEs as an active BWP in a second one of the neighboring geographic areas.