Shared FDD-TDD Spectrum Access for Asymmetric LTE Traffic
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Solution Overview
Problem
Existing LTE FDD networks face inefficiencies due to asymmetric mobile data usage, with downlink channels becoming congested while uplink channels remain underutilized, leading to wasteful use of limited spectrum.
Innovation Solution
Implementing Distributed-Input Distributed-Output (DIDO) technology and Multiple User Multiple Antenna Systems (MU-MAS) to enable concurrent TDD operation in unused uplink or downlink FDD spectrum, coordinating spectrum usage to avoid interference and maximize efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If FDD networks use dedicated uplink and downlink frequency pairs, then network compatibility and coverage are improved, but spectral efficiency deteriorates due to asymmetric data usage patterns
Solution Approach 1:
The patent merges TDD and FDD network operations by allowing TDD devices to access FDD uplink spectrum and FDD devices to access TDD downlink spectrum through coordinated spectrum sharing. This combining approach enables both network types to coexist and utilize the same physical spectrum resources, improving overall spectral efficiency while maintaining compatibility with existing FDD infrastructure
Solution Approach 2:
The patent makes spectrum resources universal by enabling FDD uplink spectrum to serve both traditional FDD uplink traffic and TDD downlink traffic simultaneously. This multi-functionality allows the same frequency resources to be dynamically allocated based on traffic demands, transforming dedicated FDD uplink spectrum into a shared resource that adapts to asymmetric data usage patterns
2Stability of the object's composition
If FDD networks allocate dedicated spectrum for uplink and downlink, then network stability is improved, but congestion in downlink channels worsens while uplink remains underutilized
Solution Approach 1:
The patent introduces dynamic spectrum sharing mechanisms that allow spectrum allocation to change based on real-time traffic conditions. TDD devices can dynamically access FDD uplink spectrum when downlink traffic demand is high, and FDD devices can access TDD downlink spectrum when needed. This dynamic adaptation enables the network to respond to asymmetric data usage patterns while maintaining overall stability through coordinated resource management
Solution Approach 2:
The patent changes the operational parameters of FDD networks by allowing TDD frame structures and timing to be superimposed on FDD uplink spectrum. This parameter change enables flexible allocation of time resources within the FDD uplink band, transforming it from a static dedicated resource into a dynamic shared resource that can accommodate varying downlink traffic demands
3Loss of energy
If TDD devices operate in FDD uplink spectrum, then spectral efficiency is improved, but interference management complexity increases
Solution Approach 1:
The patent introduces coordination mechanisms that act as intermediaries between TDD and FDD networks. These coordination protocols manage spectrum sharing by coordinating transmission timing, power levels, and resource allocation between the two network types. The intermediary coordination layer simplifies interference management by providing structured rules and procedures for shared spectrum access, reducing the complexity that would otherwise arise from uncoordinated operations
Data Source
AI summary
Systems and methods are described to concurrently utilize actively used spectrum for new TDD or FDD networks, and also for enabling Distributed-Input Distributed Output (DIDO) techniques to be used with both the new networks and the existing networks in the same spectrum.