Dynamic Spectrum Refarming via LTE Carrier Aggregation Signaling
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Solution Overview
Problem
Dynamic spectrum refarming between different radio access technologies (RATs) faces challenges such as slow bandwidth adjustments, inter-system interference, and lack of seamless signaling mechanisms, which hinder efficient spectrum utilization and user throughput.
Innovation Solution
Implementing LTE carrier aggregation mechanisms that allow dynamic bandwidth adjustments without cell reset, controlling inter-system interference, and establishing a signaling framework for smooth interaction between LTE and other RATs like GSM, enabling efficient spectrum refarming and backwards compatibility.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If LTE bandwidth is dynamically adjusted using MIB and SIB broadcasting, then bandwidth flexibility is improved, but adjustment time increases up to 40 seconds and legacy UEs cannot follow changes
Solution Approach 1:
The patent introduces a new signaling mechanism that acts as an intermediary between the network's bandwidth adjustment decisions and the UEs. Instead of relying on the existing MIB/SIB broadcast system, the invention uses direct RRC signaling to notify UEs of bandwidth changes immediately, bypassing the 40-second modification period requirement and enabling legacy UEs to follow changes without cell reset.
2Productivity
If GSM and LTE share the same spectrum blocks, then spectrum utilization is improved, but inter-system interference increases due to GSM's higher power spectral density
Solution Approach 1:
The patent implements dynamic spectrum refarming where the allocation of shared spectrum blocks between GSM and LTE is not fixed but adjusts in real-time based on network conditions and cell load. This dynamic approach allows the system to optimize spectrum utilization while managing inter-system interference through flexible, condition-based resource assignment rather than static allocation.
Solution Approach 2:
The invention changes the parameter of spectrum block assignment from a static configuration to a dynamic one that can be modified based on operational conditions. By allowing the network to reassign shared spectrum blocks between GSM and LTE according to current load and interference conditions, the system achieves both high spectrum utilization and interference management.
3Productivity
If shared spectrum blocks are assigned to RAT2 based on cell load, then spectrum efficiency is improved, but complexity of dynamic adjustment between different RATs increases
Solution Approach 1:
The patent creates a universal signaling mechanism that handles bandwidth adjustment for both dedicated and shared spectrum blocks through a single RRC signaling pathway. This multi-functional approach allows the same signaling infrastructure to manage spectrum refarming between different RATs (GSM and LTE) without requiring separate complex control mechanisms for each scenario, thereby reducing overall system complexity.
Data Source
AI summary
The present invention relates to dynamic spectrum refarming with multiple carriers. At a first communication system of a first radio access technology, a request is received in a first signaling message from a second communication system of a second radio access technology, the request including information on availability of spectrum blocks shared between the first and second communication systems. The availability of the spectrum blocks may have been determined based on a load of the second communication system. The first communication system performs carrier aggregation mechanisms based on the information with respect to the spectrum blocks, and may transmit a response to the request in a second signaling message to the second communication system, the response including an acknowledgment of an activation/deactivation of at least one additional carrier and/or a corresponding carrier aggregation.