Wireless Base Station Frame Allocation for Interference Averaging
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Solution Overview
Problem
WiMAX systems face challenges in interference averaging and reliable transmission of control channels in reuse-1 operations, as they lack the ability to handle different permutations, leading to inefficient coverage and quality of service, especially for non-standard compliant users.
Innovation Solution
A method and apparatus that allocate transmission resources by sending standardized and non-standardized communication frames alternately, allowing base stations to transmit frames compatible with both WiMAX and a secondary protocol, ensuring that both standard and enhanced subscriber terminals can decode and maintain connectivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If WiMAX systems use the same permutation for all base stations in reuse-1 operations, then standardized protocol compatibility is maintained, but interference averaging cannot be achieved and control channel coverage deteriorates
Solution Approach 1:
The system dynamically selects between standardized and non-standardized frame formats based on operational needs. Base stations can switch between using the same permutation (for standard compatibility) and different permutations (for interference averaging), making the system adaptable to different operational conditions while maintaining backward compatibility
Solution Approach 2:
The frame structure is segmented into two types: standardized frames that maintain protocol compatibility and non-standardized frames that enable interference averaging. This segmentation allows the system to simultaneously support both requirements by transmitting different frame types in different time slots or to different user groups
2Reliability
If only standardized WiMAX frames are transmitted, then protocol compatibility is ensured, but only 85% of subscriber terminals can successfully receive frames
Solution Approach 1:
The base station is designed to transmit multiple types of frames (standardized and non-standardized) using a universal transmission mechanism. This multi-functionality allows the system to serve both standard-compliant terminals and enhanced terminals that can utilize non-standardized frames for improved reception success rates
Solution Approach 2:
The system changes frame structure parameters by introducing non-standardized frames with different permutation patterns. This parameter change enables the system to achieve 97% reception success rate for enhanced terminals while maintaining compatibility with standard terminals through standardized frames
3Reliability
If different permutations are used by different base stations, then interference averaging is achieved, but compatibility with standardized WiMAX protocol is lost
Solution Approach 1:
The system employs periodic transmission of standardized frames interspersed with non-standardized frames. This periodic action ensures that standard-compliant terminals can periodically synchronize and maintain protocol compatibility, while enhanced terminals can continuously utilize non-standardized frames for interference averaging
Solution Approach 2:
Standardized frames act as an intermediary mechanism that bridges between the standardized WiMAX protocol and the enhanced non-standardized frames. These standardized frames maintain protocol compatibility and serve as a common reference point, while allowing the system to simultaneously transmit non-standardized frames for improved interference management
Data Source
AI summary
There is provided a method and apparatus for allocating transmission resources in a wireless network in which some of the terminals communicate with the base station by exchanging communication frames that are compatible with a first communication protocol while other terminals receive communications from the base station that are compatible with a second communication protocol by using non-standardized communication frames or communication frames that are compatible with another standardized protocol. The base station transmits a plurality of frames, some of which are compatible with the first communication protocol while others—with the second communication protocol. The terminals that are operative to receive frames of the second communication protocol are capable of decoding frames that are compatible with both communication protocols, whereas terminals that are operative to receive frames of the first communication protocol are capable of decoding only standardized communication frames of the first communication protocol.