Network Element Orthogonality Measure Allocation
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Solution Overview
Problem
In communication systems using code division multiple access (CDMA), the limited orthogonal resources such as codes and frequencies lead to interference issues and difficulties in separating user data, especially when multi-antenna techniques are applied, with existing methods either not increasing code availability or increasing interference through secondary scrambling codes.
Innovation Solution
The method generates feedback information from user devices to create orthogonality measures in network elements, allowing for the allocation of transmission resources using both orthogonal and non-orthogonal codes to expand available code space without increasing interference levels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If orthogonal codes are used for transmission, then user data separation is improved, but the limited code pool causes resource shortage
Solution Approach 1:
The patent changes the orthogonality parameter by introducing non-orthogonal codes with controlled orthogonality measures. Instead of strictly orthogonal codes, the system uses codes with calculated orthogonality measures that balance code availability and interference levels, expanding the effective code pool while maintaining acceptable separation performance.
2Quantity of substance
If secondary scrambling codes are introduced to increase code availability, then code pool expansion is achieved, but interference increases requiring higher power levels
Solution Approach 1:
The patent implements feedback mechanisms where user devices report channel quality and interference measurements to the network element. The network element uses this feedback to dynamically adjust code allocations and orthogonality measures, optimizing code availability while controlling interference levels without requiring excessive power increases.
Solution Approach 2:
The system dynamically adjusts the orthogonality measure parameter based on feedback and transmission conditions. By changing the orthogonality measure rather than strictly maintaining orthogonality, the system can allocate more codes while controlling the resulting interference through parameter optimization rather than power increases.
3Quantity of substance
If non-orthogonal codes are used to expand code space, then code pool expansion is achieved, but orthogonality for user separation decreases
Solution Approach 1:
The patent introduces an orthogonality measure parameter that quantifies the degree of orthogonality between allocated codes. The system optimizes this parameter to achieve the desired balance between code space expansion and user separation, allowing controlled use of non-orthogonal codes while maintaining acceptable performance through parameter optimization.
Solution Approach 2:
The patent replaces the traditional mechanical approach of strict orthogonal code allocation with an information-theoretic approach using orthogonality measures and feedback. Instead of relying on fixed orthogonal structures, the system uses calculated measures and adaptive allocation based on channel conditions to achieve better overall performance.
Data Source
AI summary
The invention is related to a network element, comprising: means for receiving feedback information from the user device; means for creating a first orthogonality measure by using the feedback information; means for creating a second orthogonality measure by comparing transmission resources; means for transmitting information to at least one user device.