Communication Resource Allocation via Frequency Sub-band Segmentation
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Solution Overview
Problem
Existing multi-user cellular communication systems face challenges in providing both high link-diversity and multi-user diversity efficiently, as existing solutions like 'zones' in IEEE Std 802.16-2004 limit link-diversity and cause delays in channel type availability.
Innovation Solution
The system divides communication resources into time and frequency sub-bands, allowing simultaneous frequency-localized and frequency-distributed channels without interruption, with the ability to change classification periodically, and uses codes for resource schemes to optimize throughput and reduce signaling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If frequency-distributed channels are provided to ensure high link-diversity, then link-diversity is improved, but multi-user diversity cannot be efficiently utilized
Solution Approach 1:
The system segments the frequency spectrum into multiple sub-bands and divides transmission frames into zones. Frequency-distributed channels are allocated in frequency-hopping manner across sub-bands for link-diversity, while frequency-localized channels are allocated in scheduled manner within sub-bands for multi-user diversity. This segmentation allows both channel types to coexist without interfering with each other's performance.
2Productivity
If frequency-localized channels are provided to exploit multi-user diversity, then system throughput is improved, but link-diversity is limited
Solution Approach 1:
The system applies different channel allocation strategies to different frequency sub-bands and time zones. In downlink, frequency-localized channels are provided in first zones for multi-user diversity exploitation, while frequency-distributed channels are provided in second zones for link-diversity. This local quality differentiation allows each channel type to optimize its specific function without compromising the other.
3Adaptability or versatility
If zones are used to separate frequency-localized and frequency-distributed channels, then both channel types can be provided, but delays occur in channel type availability
Solution Approach 1:
The system implements periodic zone structures within transmission frames, where first zones are dedicated to frequency-localized channels and second zones to frequency-distributed channels. This periodic alternation allows the system to switch between channel types at regular intervals, ensuring both are available when needed while minimizing delays compared to non-periodic allocation schemes.
4Measurement precision
If accurate channel quality feedback is collected for scheduling decisions, then scheduling performance is improved, but feedback reliability deteriorates at cell-edge users
Solution Approach 1:
The system dynamically adapts its channel allocation strategy based on user location and feedback quality. For cell-edge users with unreliable feedback, the system transitions from scheduled frequency-localized channels to frequency-distributed channels that do not depend on accurate feedback. This dynamic adaptation allows the system to maintain scheduling performance for cell-center users while ensuring reliable communication for cell-edge users.
Data Source
AI summary
The present invention relates to a method for allocating communication resources in a multi-user cellular communication system, wherein communication resources are divided in time periods and frequency sub-bands, wherein part of the communication resources are used for frequency-localized communication channels, and part of the communication resources are used for frequency distributed channels. The method further comprises the steps of classifying part of the frequency sub-bands as frequency sub-bands carrying frequency-distributed channels, classifying the remaining part of the frequency sub-bands as frequency sub-bands carrying frequency-localized channels. The present invention also relates to a system, a transmitter and a communication system.