Inter-band Handover for CBRS Spectrum Revocation
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Solution Overview
Problem
Current telecommunications networks face challenges in maintaining continuous communication sessions when a spectrum grant is revoked in CBRS bands, leading to dropped calls due to the lack of efficient handover mechanisms between different access networks.
Innovation Solution
Implementing a system that triggers inter-band handovers of terminals from a revoked CBRS band to a licensed band within a predetermined time frame, utilizing entry nodes and domain proxies to manage spectrum grants and handover processes, ensuring seamless session continuity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If terminals operate on CBRS bands with dynamic spectrum grants, then network capacity and spectrum utilization are improved, but session continuity deteriorates when spectrum grants are revoked
Solution Approach 1:
The system performs preliminary actions by establishing handover readiness before spectrum grant revocation occurs. Entry nodes pre-configure handover parameters and maintain connection with target licensed band networks, so that when revocation occurs, terminals can immediately execute handover without session interruption. This is achieved through proactive setup of handover conditions and target network preparation.
Solution Approach 2:
The patent introduces domain proxies as intermediary entities that mediate between CBRS access nodes and core network functions. These proxies receive revocation notifications, coordinate handover decisions, and manage the transition process, ensuring seamless session continuity. The intermediary handles the complexity of inter-frequency handover while maintaining session integrity throughout the transition.
2Reliability
If inter-band handover mechanisms are implemented, then session continuity is improved, but network complexity increases
Solution Approach 1:
The system implements universal handover capabilities where entry nodes and domain proxies are designed to handle multiple network bands (CBRS and licensed bands) and multiple session types (voice, data, video). This multi-functionality reduces the need for separate specialized mechanisms for each band or session type, thereby managing complexity while maintaining session continuity across different scenarios.
Solution Approach 2:
The handover mechanism incorporates continuous feedback loops where domain proxies monitor spectrum grant status, terminal connection quality, and network conditions. When revocation is detected or predicted, feedback triggers automated handover initiation. This feedback-driven approach simplifies complexity by using event-triggered handovers rather than continuous manual management, maintaining reliability through adaptive response to network conditions.
Data Source
AI summary
A node of a radio access network (e.g., a cellular network) can receive a revocation message revoking a spectrum grant (e.g., a Citizens Broadband Radio Service, CBRS, discontinuation notice). The node can determine a first group of terminals that are in communication with the node via wireless resources within the spectrum grant. The node can, in response to the revocation message, trigger respective inter-band handovers of the terminals of the first group of terminals. In some examples, a system includes a domain proxy that receives a grant message indicating the spectrum grant; notifies the node; subsequently, receives a revocation message revoking the spectrum grant; and sends a handover command to the node in response to the revocation message. The spectrum grant can be located within 3GPP band forty-eight or other bands.