Flexible Duplex HARQ Timing for FDD Spectrum Adaptation
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Solution Overview
Problem
Conventional cellular communication systems, particularly those using Frequency Division Duplexing (FDD), struggle with adapting to asymmetric service demands between uplink and downlink services, leading to inefficient utilization of frequency spectrum resources due to static resource allocation.
Innovation Solution
A method is introduced to determine and send Hybrid Automatic Repeat Request (HARQ) timing for downlink subframes in FDD systems, allowing for dynamic grouping and timing adjustment of HARQ-ACK response information, enabling flexible duplex operation by utilizing both FDD and Time Division Duplexing (TDD) configurations to optimize resource utilization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If FDD uses paired frequency spectrums for uplink and downlink, then frequency spectrum resources are allocated statically, but resource utilization efficiency deteriorates due to asymmetric service demands
Solution Approach 1:
The patent introduces flexible subframes that can be dynamically switched between uplink and downlink functions within the FDD framework. This allows the system to adapt resource allocation to changing service demands in real-time, transforming the static FDD resource allocation into a dynamic system that can respond to asymmetric traffic patterns while maintaining backward compatibility.
Solution Approach 2:
The patent makes FDD uplink frequency spectrum serve multiple functions by allowing it to be used for both traditional uplink transmissions and downlink data transmissions during flexible subframes. This multi-functionality enables the system to optimize resource utilization for downlink-heavy services while maintaining uplink capability when needed.
2Productivity
If downlink data is transmitted in FDD uplink frequency spectrum, then resource utilization improves, but HARQ-ACK feedback mechanism deteriorates due to lack of defined feedback timing
Solution Approach 1:
The patent segments downlink subframes into different groups based on their corresponding uplink subframe status. By dividing flexible subframes into those that correspond to uplink subframes and those that correspond to downlink subframes, the system can apply different HARQ timing rules to different segments, simplifying the feedback mechanism while maintaining high resource utilization.
Solution Approach 2:
The patent defines specific HARQ timing parameters (k values) for different subframe groups in flexible duplex mode. By changing the timing parameter k based on which subframe group the downlink subframe belongs to, the system provides clear feedback timing rules that reduce complexity while enabling efficient resource utilization in flexible duplex scenarios.
Data Source
AI summary
A method and an apparatus for sending response information and a computer storage medium are disclosed. The method comprises: determining a Hybrid Automatic Repeat reQuest (HARQ) timing corresponding to a downlink subframe, wherein the downlink subframe is a downlink subframe, for which a feedback of HARQ-ACK response information is needed, and is located in a Frequency Division Duplexing (FDD) downlink or uplink frequency spectrum; and sending the HARQ-ACK response information corresponding to the downlink subframe according to the determined HARQ timing.