Multi-numerology OFDM Frequency Hopping Sub-band Allocation
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Solution Overview
Problem
In 5G communication systems using orthogonal frequency division multiplexing (OFDM), interference occurs due to different sub-carrier spacings in multi-numerology, leading to reception performance deterioration and increased implementation complexity.
Innovation Solution
A method and apparatus for data transmission and reception that utilize frequency hopping and sub-band hopping by allocating users with the same numerology to specific sub-bands, applying the same filtering and inverse fast Fourier transform, thereby reducing interference and complexity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multi-numerology sub-carriers with different sub-carrier spacings are used to support various data traffic types, then resource utilization and transmission capability are improved, but interference occurs between sub-carriers and reception performance deteriorates
Solution Approach 1:
The patent segments the frequency spectrum into multiple sub-bands and assigns users with the same numerology to specific sub-bands. This segmentation prevents different numerology sub-carriers from overlapping in the frequency domain, thereby eliminating interference while maintaining resource utilization benefits of multi-numerology systems.
Solution Approach 2:
The patent applies local quality by configuring different sub-carrier spacings for different sub-bands based on user requirements. Each sub-band is optimized with appropriate numerology settings, allowing the system to achieve both high resource utilization and low interference by matching local frequency resources to specific traffic types.
2Adaptability or versatility
If multi-numerology sub-carriers with different sub-carrier spacings are used to support various data traffic types, then resource utilization and transmission capability are improved, but implementation complexity increases
Solution Approach 1:
By segmenting users into different sub-bands based on their numerology requirements, the system simplifies implementation. Each sub-band can be processed with dedicated filtering and inverse fast Fourier transform parameters, avoiding the need for complex multi-rate processing and reducing overall system complexity while maintaining transmission capability.
Solution Approach 2:
The patent reduces implementation complexity by applying local quality through numerology-specific processing for each sub-band. Instead of implementing a complex universal processor that handles all numerology types, the system uses optimized local processing for each sub-band, reducing computational complexity and implementation difficulty.
3Adaptability or versatility
If users with different numerology are allowed to overlap in symbol area, then resource flexibility is improved, but interference occurs due to varying symbol duration
Solution Approach 1:
The patent resolves the interference issue by segmenting the frequency resources into sub-bands where users with the same numerology are grouped together. This prevents overlapping of users with different symbol durations in the frequency domain, eliminating interference while maintaining resource flexibility through sub-band allocation.
Solution Approach 2:
The patent applies local quality by configuring appropriate sub-carrier spacing and symbol duration parameters for each sub-band based on the users' requirements. This allows the system to maintain resource flexibility while avoiding interference by matching local time-frequency parameters to user needs.
Data Source
AI summary
A base station for transmitting data in an OFDM system is provided. The base station is configured to convert data or a signal into a wireless band and transmit the converted data or signal to a terminal, down-convert a signal and output the down-converted signal, and generate a message for requesting terminal capability information for a sub-carrier spacing and transmit the message to the terminal accessing the base station, generate information on sub-bands of groups available to the terminal in response to receiving a terminal capability response message from the terminal and transmit the information on the sub-bands of groups available to the terminal, allocate a resource by selecting sub-bands of one group of the sub-bands of the groups available to the terminal in response to receiving a scheduling request message from the terminal and generate and transmit a resource allocation message, and transmit the data using the allocated resource.