Resource Allocation in Mobile Communication Systems
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Solution Overview
Problem
In next-generation mobile communication systems, the Orthogonal Frequency Division Multiplex Access (OFDMA) scheme faces challenges in efficiently allocating resources to increasing numbers of users, leading to unsatisfactory Quality of Service (QoS) and decreased frequency usage efficiency due to interference and complexity in resource allocation.
Innovation Solution
A new multiplexing scheme is introduced, where a modulating/coding unit converts complex signals into 1D signals, which are then reconstructed into 2D signals and allocated to different frequency bands, allowing two users to share a sub-channel by dividing phases into I-phase and Q-phase, enabling flexible resource allocation and reducing interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If OFDMA scheme is used to allocate resources to multiple users, then frequency usage efficiency is improved, but resource allocation complexity increases and QoS deteriorates as number of users increases
Solution Approach 1:
The patent segments the frequency spectrum into multiple sub-channels and further divides each sub-channel into even and odd frequency components. This segmentation allows multiple users to share the same sub-channel by allocating different frequency components (even/odd) to different users, thereby reducing resource allocation complexity while maintaining frequency usage efficiency.
Solution Approach 2:
The patent introduces an additional dimension to resource allocation by dividing frequency resources not only into sub-channels but also into even and odd frequency components within each sub-channel. This two-dimensional allocation approach (sub-channel × even/odd) enables more users to be served simultaneously without proportionally increasing allocation complexity.
2Quantity of substance
If OFDMA scheme is used to support more users, then system capacity is improved, but QoS deteriorates due to increased interference and allocation difficulty
Solution Approach 1:
By segmenting each sub-channel into even and odd frequency components, the patent enables multiple users to share the same sub-channel with orthogonal frequency allocation. This segmentation reduces user-to-user interference while supporting a larger number of users, thereby maintaining QoS even as system capacity increases.
Solution Approach 2:
The patent applies local quality by allocating different frequency components (even or odd) to different users within the same sub-channel based on their specific channel conditions and requirements. This localized frequency allocation optimizes QoS for each user while maximizing overall system capacity.
3Reliability
If frequency resources are allocated to each user separately in OFDMA, then user-specific QoS is maintained, but frequency usage efficiency decreases
Solution Approach 1:
The patent merges multiple users' frequency allocations by allowing even and odd frequency components of the same sub-channel to be shared among different users. This merging approach improves frequency usage efficiency while maintaining user-specific QoS through orthogonal frequency division multiplexing that eliminates user-to-user interference.
Data Source
AI summary
Provided are an apparatus and method for allocating resources in a mobile communication system. The apparatus includes a modulating/coding unit for modulating transmission data of one or more users according to a predetermined modulation scheme and for outputting a complex signal; a 2-Dimensional (2D)/1-Dimensional (1D) converter for converting the complex signal into a 1D signal; and a re-modulator for reconstructing the 1D signal to a 2D signal and for allocating two components of the 2D signal to two different frequency bands.