Wireless Resource Allocation Using OFDM and GFDM Zone Segmentation
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Solution Overview
Problem
The 3GPP LTE system's frame structure with a 1 ms transmission time interval (TTI) cannot support the reduced data request latency required by 5G technology, which aims for latency 10 times lower, due to limitations in new TTI structure and symbol types.
Innovation Solution
A method and device for allocating resources in a wireless communication system by dividing zones with orthogonal frequency division multiplexing (OFDM) and generalized frequency division multiplexing (GFDM) symbols, with a predetermined number of guard subcarriers between them, to enhance time-frequency resource efficiency and support lower latency communication.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If a new TTI structure with new symbol types is introduced to reduce latency, then data request latency is reduced, but device complexity and system compatibility increase
Solution Approach 1:
The patent divides the frequency domain into multiple zones, with different subcarriers allocated to different communication modes (legacy OFDM and new GFDM). This segmentation allows simultaneous support of multiple TTI structures without requiring complete system redesign, thereby reducing latency for specific services while maintaining overall system compatibility and managing complexity.
2Adaptability or versatility
If frequency division multiplexing is used to allocate zones for different communication modes, then resource allocation flexibility improves, but device complexity increases
Solution Approach 1:
The patent applies different communication modes (OFDM or GFDM) to different frequency zones based on local requirements. Each zone can be independently configured with appropriate parameters, allowing flexible adaptation to different service requirements while keeping the overall system structure manageable through localized optimization rather than global redesign.
3Reliability
If guard subcarriers are allocated at zone boundaries, then interference between modes is reduced, but loss of useful frequency resources increases
Solution Approach 1:
The patent introduces guard subcarriers as intermediary elements at the boundaries between different communication mode zones. These guard subcarriers act as buffers that prevent interference between adjacent zones using different modulation schemes, ensuring reliable mode separation. The number of guard subcarriers is optimized to provide sufficient isolation while minimizing the loss of usable frequency resources.
Data Source
AI summary
A method for a base station to allocate resources for supporting a plurality of wireless communication modes in a wireless system according to the present invention comprises the steps of: allocating, using frequency-division multiplexing, a first zone composed of orthogonal frequency division multiplexing (OFDM) symbols and a second zone composed of generalized frequency division multiplexing (GFDM) symbols on time and frequency domains; and allocating a predetermined number of guard subcarriers to the boundary between the first zone and the second zone, wherein the predetermined number is determined on the basis of the number of sub-symbols of the GFDM symbols of the second zone.