Subchannel Allocation Using Downlink Uplink State Information
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Solution Overview
Problem
Existing spectrum sharing technologies face inefficiencies and reduced flexibility due to incompatibility with Orthogonal Frequency Division Multiple Access (OFDMA) systems, reliance on free channel resources, and increased interference between primary and secondary systems, limiting their applicability and effectiveness.
Innovation Solution
A method and system for sharing subchannels that utilize downlink and uplink state information to calculate and compare channel quality to interference ratios, optimizing subchannel allocation between uplink and downlink Mobile Stations (MS) to improve spectrum sharing efficiency and flexibility, while reducing interference through power control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If Opportunistic Radio system is used for spectrum sharing, then coexistence with 3G UMTS is achieved, but spectrum sharing efficiency is reduced due to reliance on free channel resources and increased interference
Solution Approach 1:
The patent changes the scheduling parameters by calculating channel quality to interference ratios for each subchannel based on both downlink and uplink state information. This allows dynamic allocation decisions that optimize spectrum sharing efficiency while maintaining coexistence, moving away from static free-channel-based allocation.
Solution Approach 2:
The patent implements feedback mechanisms where the base station obtains uplink state information from mobile stations and uses this feedback to adjust subchannel allocation decisions. This closed-loop approach enables the system to adapt to changing channel conditions and interference levels, improving sharing efficiency.
2Quantity of substance
If multi-hop transmission is applied in CDMA/FDD system, then downlink spectrum shortage is overcome, but system flexibility is reduced due to requirement of same radio access technology
Solution Approach 1:
The patent creates a universal subchannel allocation framework that can accommodate different radio access technologies and transmission scenarios. The base station can allocate subchannels to uplink mobile stations, downlink mobile stations, or both simultaneously based on channel conditions, providing multi-functionality and system flexibility.
Solution Approach 2:
The patent implements dynamic subchannel allocation where the allocation decisions are continuously adjusted based on real-time channel quality and interference conditions. This dynamic approach allows the system to adapt to varying traffic demands and channel states, improving both resource utilization and flexibility.
3Ease of operation
If uplink subchannel is allocated without considering downlink state information, then allocation simplicity is maintained, but overall traffic performance is reduced
Solution Approach 1:
The patent merges downlink and uplink subchannel allocation processes by obtaining both downlink state information and uplink state information, calculating channel quality to interference ratios for both directions, and making unified allocation decisions that consider overall system performance rather than just uplink conditions.
Data Source
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AI summary
A method, an apparatus and a system for sharing a subchannel are disclosed. The method includes: obtaining downlink state information and uplink state information of a subchannel; and scheduling the subchannel according to the downlink state information and uplink state information of the subchannel, and allocating the subchannel to an uplink Mobile Station (MS) and/or a downlink MS. The method improves efficiency and flexibility of sharing subchannels, and therefore improves overall traffic significantly.