Frequency Hopping Multiplexing for Wireless Diversity
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Solution Overview
Problem
Current OFDMA systems lack an efficient scheme for multiplexing wide-band and sub-band frequency hopping to maximize diversity effect without additional overhead, particularly in scenarios where channel state changes rapidly, such as for high-speed terminals.
Innovation Solution
A method and apparatus for efficiently multiplexing data by identifying hopping information including the number of sub-bands and sub-band size, determining resource indices for transmission and reception, and performing time division multiplexing on sub-band and wide-band frequency hopping schemes, using Distributed Resource Channels (DRCH) and Block Resource Channels (BRCH) to optimize resource allocation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If frequency hopping is used for high-speed terminals with rapidly changing channel state, then adaptability to channel changes is improved, but system complexity increases due to need for additional multiplexing mechanisms
Solution Approach 1:
The patent combines wide-band frequency hopping and sub-band frequency hopping into a unified multiplexing framework. By merging these two hopping mechanisms and using a single indicator value to specify the multiplexing ratio, the system achieves adaptability to rapidly changing channel conditions without requiring separate complex control mechanisms for each hopping type.
Solution Approach 2:
The frequency hopping multiplexing mechanism is designed to serve multiple functions simultaneously: it supports both wide-band and sub-band hopping, accommodates different terminal speed scenarios, and maintains backward compatibility with existing OFDMA systems. This multi-functionality reduces overall system complexity by eliminating the need for separate specialized mechanisms.
2Reliability
If wide-band and sub-band frequency hopping are multiplexed to maximize diversity effect, then communication reliability is improved, but overhead increases due to additional control information requirements
Solution Approach 1:
The patent extracts the essential control information needed for frequency hopping multiplexing into a single indicator value within existing downlink control information. By taking out only the necessary multiplexing ratio information and integrating it into the existing DCI structure, the system achieves reliable communication without adding significant overhead.
Solution Approach 2:
The terminal autonomously determines the frequency hopping configuration based on the indicator value and pre-configured parameters. The terminal self-determines the appropriate hopping pattern and resource allocation without requiring extensive control signaling, thereby maintaining reliability while minimizing overhead.
3Productivity
If frequency selective scheduling is applied to allocate superior frequency bands, then system performance is improved, but it becomes unavailable for high-speed terminals with rapidly changing channel state
Solution Approach 1:
The patent implements dynamic frequency hopping that adapts to the terminal's movement speed and channel conditions. For high-speed terminals, the system dynamically switches between wide-band and sub-band hopping patterns, while for stationary or low-speed terminals, traditional frequency selective scheduling remains effective. This dynamic approach maintains system performance across diverse terminal scenarios.
Data Source
AI summary
Methods and apparatuses are provided for transmitting data in a mobile station of a wireless communication system. Hopping information including a number of sub-bands and a size of a sub-band is identified. Resource allocation information is identified. A resource index is determined for transmitting the data based on the resource allocation information, and determining a resource index change in a unit of a sub-band, a resource index change in a unit of a resource unit, the number of sub-bands, and the size of the sub-band. The data is transmitted using the determined resource index. Each sub-band includes at least one resource unit, and each resource unit includes a plurality of subcarriers.