Hybrid ARQ Frequency Overlay for Mixed Bandwidth Support
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Solution Overview
Problem
Current OFDM-based broadband wireless communication systems can only support a mobile station using a single bandwidth, requiring a change in frequency allocation to accommodate new mobile stations with wider bandwidths, which prevents simultaneous service to legacy mobile stations with narrow bandwidths.
Innovation Solution
Implementing a frequency overlay scheme that allows multiple frequency allocations for packet transmission and retransmission, using address mapping and interleaving column switching schemes to dynamically change frequency allocations, enabling support for both legacy and new mobile stations with different bandwidths.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the frequency allocation is changed to support a new mobile station with wider bandwidth, then the new mobile station can be served, but all legacy mobile stations with narrow bandwidth cannot be served anymore
Solution Approach 1:
The frequency allocation is divided into multiple sub-allocations (first frequency allocation and second frequency allocation) that can be independently assigned to different mobile stations. This allows the system to simultaneously support both legacy stations with narrow bandwidth and new stations with wide bandwidth by segmenting the available spectrum resources.
Solution Approach 2:
The frequency allocation is made dynamic and flexible rather than fixed. The base station can dynamically assign different frequency allocations to different mobile stations based on their bandwidth requirements, allowing the system to adapt to mixed scenarios of legacy and new stations without requiring a complete FA change.
2Reliability
If a single frequency allocation is used for packet transmission, then the transmission is simple, but the retransmission gain is limited
Solution Approach 1:
Multiple frequency allocations are combined and used together for packet transmission and retransmission. The base station can select from multiple available frequency allocations when transmitting packets, and use different combinations for retransmission, thereby merging the benefits of multiple channels to improve reliability and retransmission gain.
Data Source
AI summary
A broadband wireless communication system using a plurality of Frequency Allocations (FAs) is provided. A method for packet transmission of a packet of a transmitting end includes dividing one encoded packet into a plurality of parts, mapping a plurality the plurality of parts of the packet to the FAs through the plurality of different FAs transmission, when a re-transmission request is received, re-mapping the plurality of parts of the packet to the FAs such that at least one of the at least one of the plurality of parts is re-mapped to an FA that is different than an FA previously mapped thereto. Retransmitting the encoded packet by at least one of a number of subunits.