Adaptable Frame Structure for Multi-Carrier Subframe Configuration
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Solution Overview
Problem
Existing wireless communication systems are inadequate in handling the distinct transmission characteristics of voice, interactive data, and video services, particularly in terms of traffic symmetry and signal interaction, as they struggle to efficiently support both asymmetric and symmetric applications simultaneously.
Innovation Solution
A multi-carrier system with an adaptable frame structure that synchronizes transmission frames across cells, allowing for independent adjustment of downlink and uplink ratios in subframes to accommodate various traffic patterns, combined with adaptive modulation and coding, power control, and hybrid ARQ to optimize service delivery.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a single wireless system is designed to support multiple services (voice, data, video) simultaneously, then service versatility is improved, but system complexity increases due to conflicting transmission requirements
Solution Approach 1:
The system divides the frequency band into multiple subbands and the transmission frame into multiple subframes. Each subband-subframe combination can be independently configured to match specific service requirements (voice, data, or video), allowing the system to handle diverse traffic patterns without requiring a completely different system for each service type.
Solution Approach 2:
The patent implements dynamic configuration where the downlink-uplink ratio and subband allocation can be adjusted in real-time based on current traffic conditions. This allows the system to adapt to changing service demands (e.g., switching from voice-dominated to data-dominated traffic) without fixed constraints, thereby managing complexity through flexible adaptation rather than rigid multi-system architecture.
2Productivity
If time-division duplex systems are designed for asymmetric two-way applications, then data service efficiency is improved, but broadcasting capability deteriorates
Solution Approach 1:
The system applies different configuration qualities to different subband-subframe combinations. Some subbands are configured with asymmetric downlink-uplink ratios optimized for data services, while others maintain symmetric configurations suitable for broadcasting. This local differentiation allows both data efficiency and broadcasting capability to coexist within the same system.
Solution Approach 2:
The adaptable frame structure serves multiple functions: it can configure subframes for asymmetric data transmission when needed, while simultaneously configuring other subframes for symmetric broadcasting operations. This multi-functionality eliminates the need for separate systems for data and broadcasting services.
3Device complexity
If subframes are configured with fixed downlink and uplink ratios, then system simplicity is improved, but adaptability to different traffic patterns deteriorates
Solution Approach 1:
The system transitions from fixed to dynamic subframe configuration. Each subframe can independently adjust its downlink-uplink ratio based on real-time traffic conditions. For example, during video streaming periods, subframes can be configured with higher downlink ratios, while during interactive data sessions, more balanced ratios are applied. This dynamic adaptation maintains reasonable system simplicity through automated configuration rather than complex manual setup for each scenario.
Data Source
AI summary
Methods and apparatus for subframe configuration and generation in a multi-cell multi-carrier system. A frame for radio transmission in the system consists of multiple subframes, and each subframe consists of multiple Orthogonal Frequency Division Multiplexing (OFDM) symbols. Training symbols, frequency-domain data scrambling, size of Fast-Fourier Transform (FFT), or length of cyclic prefix can be configured differently for each subframe to facilitate different applications, such as unicasting or broadcasting.