Orthogonal Resource Allocation for Wireless Terminals
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Solution Overview
Problem
Third-generation mobile radio systems and subsequent designs face inefficiencies due to all users sharing the same carrier frequency, leading to excessive guard interval overhead and reduced spectral efficiency, especially since only a few users have poor transmission conditions, such as high speed or distance from the base station, affecting overall cell performance.
Innovation Solution
A method to allocate transmission resources by grouping mobile radio terminals based on their characteristic data, such as speed and distance from the base station, where one group receives highly orthogonal resources and the other group receives resources with low orthogonality, allowing for adaptive parameter adjustments within each group using multi-carrier methods like OFDM/OFDMA or DS-CDMA, minimizing interference and overhead.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If all users share the same carrier frequency using multi-carrier methods (CDMA/OFDM), then spectral efficiency is improved, but guard interval overhead increases and interference between users occurs
Solution Approach 1:
The patent segments users into different groups based on their transmission conditions (e.g., mobile speed, distance from base station). Users with similar conditions are grouped together and assigned the same carrier frequency, while different groups use different frequencies. This segmentation allows the system to reduce guard interval overhead for each group while maintaining overall spectral efficiency, as users within each group have comparable interference characteristics.
Solution Approach 2:
The patent applies local quality by assigning different transmission parameters (carrier frequency, guard interval length) to different user groups based on their specific transmission conditions. Instead of using a uniform configuration for all users, each group receives optimized parameters suited to their local conditions, thereby reducing overall guard interval overhead while maintaining spectral efficiency.
2Reliability
If guard intervals are extended to avoid inter-symbol interference for all users, then transmission reliability is improved, but spectral efficiency decreases
Solution Approach 1:
The patent segments users into groups with similar transmission conditions and assigns appropriate guard interval lengths to each group. Users with favorable conditions (e.g., low mobile speed, short distance) receive shorter guard intervals, while users with challenging conditions receive longer guard intervals. This segmented approach maintains transmission reliability for each group while improving overall spectral efficiency compared to using the maximum guard interval for all users.
Solution Approach 2:
The patent changes the guard interval parameter dynamically based on user group characteristics. Instead of using a fixed guard interval length for all users, the system adjusts the guard interval parameter according to the transmission conditions of each user group, thereby optimizing the balance between transmission reliability and spectral efficiency.
3Object-generated harmful factors
If orthogonal resources are assigned to all users, then interference between users is suppressed, but resource allocation complexity and overhead increase
Solution Approach 1:
The patent segments users into groups and applies orthogonal resource assignment only between groups, rather than between all individual users. Users within the same group share resources with relaxed orthogonality requirements. This segmented approach suppresses dominant inter-group interference while reducing resource allocation complexity compared to strict orthogonal assignment for all users.
Solution Approach 2:
The patent merges users with similar transmission conditions into the same group, allowing them to share transmission resources. This merging reduces the number of orthogonal resource assignments needed, thereby reducing allocation complexity and overhead while maintaining acceptable interference levels through group-based resource management.
Data Source
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AI summary
The method involves determining characteristics between a base station (12) and mobile stations (14-30) that are assigned to the basis station. The mobile stations are divided into two groups (32, 36) using the determined characteristic for utilizing available bandwidth. Transmission resources are allocated based on a group membership, where the transmission resources of one of the groups are provided orthogonal to the transmission resources of another group. The characteristics are transmitted over a signaling channel to the base station. An independent claim is also included for a device for allocating a transmission resource of a wireless communication system, comprising a base station.