Flexible FDD Frame Dynamic Band Allocation
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Solution Overview
Problem
Conventional full duplex communication systems face inefficiencies due to asymmetrical data traffic patterns, leading to suboptimal resource utilization in FDD schemes, which can result in wasted resources and reduced communication efficiency.
Innovation Solution
Implementing a flexible FDD frame structure that dynamically allocates UL bands for DL transmission during heavy DL traffic conditions, incorporating guard bands and guard times to manage interference and optimize resource use, while modifying HARQ feedback timing to accommodate the flexible frame structure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional FDD scheme with fixed UL/DL band allocation is used, then system stability is maintained, but resource utilization efficiency deteriorates under asymmetrical data traffic conditions
Solution Approach 1:
The patent implements dynamic band allocation where the UL band can be flexibly assigned to DL transmission based on traffic conditions. The base station determines whether to allocate the UL band to DL transmission dynamically, allowing the system to adapt to varying traffic patterns and maximize resource utilization efficiency while maintaining operational stability through controlled decision-making processes
2Productivity
If UL band is allocated for DL transmission during heavy DL traffic, then resource utilization efficiency improves, but interference management complexity increases
Solution Approach 1:
The patent introduces guard bands as intermediary frequency elements that separate DL and UL transmissions. These guard bands act as buffers that reduce interference between simultaneous DL and UL transmissions, enabling the system to allocate UL bands for DL transmission during heavy traffic while maintaining acceptable interference levels through the protective effect of the guard bands
3Adaptability or versatility
If flexible FDD frame structure is implemented, then resource allocation flexibility improves, but HARQ feedback timing complexity increases
Solution Approach 1:
The patent pre-defines multiple HARQ feedback timing configurations that can be selected based on the current flexible FDD frame structure. By having predetermined timing options ready, the system can adapt to different resource allocation scenarios without requiring complex real-time timing calculations, thus reducing HARQ feedback timing complexity while maintaining resource allocation flexibility
Data Source
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Figure 3(a)~3(b)
AI summary
A method for a terminal performing communication using a flexible frequency division duplex (FDD) frame in a wireless communication system comprises the step of transmitting and receiving a signal using the flexible FDD frame, wherein the flexible FDD frame comprises a downlink band allocated from the wireless communication system as a resource for a downlink, and an uplink band allocated as a resource for an uplink, wherein the uplink band may comprise a downlink sub-band allocated as a resource for the downlink by a base station for the flexible FDD scheme.