Multichannel Access via Frequency Band Segmentation
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Solution Overview
Problem
Current wireless communication systems face challenges in increasing data transmission rates and efficiently utilizing available channel bandwidth, particularly in multichannel access scenarios where multiple user terminals share resources across multiple frequency bands.
Innovation Solution
The method involves transmitting scheduling information to wireless nodes indicating specific frequency bands for data frame exchanges, allowing simultaneous data frame transmissions across multiple frequency bands, and utilizing a multichannel Aggregate Physical Layer Protocol Data Unit (APPDU) structure with a Very High Throughput Signal (VHT-SIG) field to manage modulation-coding schemes and bandwidth allocation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If multiple user terminals share channel resources using time division multiple access (TDMA) on a single frequency band, then device complexity is reduced and ease of operation is improved, but data transmission rate and bandwidth utilization are limited
Solution Approach 1:
The patent transitions from single-frequency-band TDMA to multi-frequency-band parallel access, adding the frequency dimension to resource allocation. Multiple user terminals simultaneously access different frequency bands, transforming the system from one-dimensional time sharing to multi-dimensional (time-frequency) resource allocation, thereby increasing data transmission rate without proportionally increasing system complexity
Solution Approach 2:
The patent segments the available bandwidth into multiple frequency bands and allocates different bands to different user terminals. This segmentation allows parallel data transmission across multiple frequency bands, effectively increasing overall data transmission rate while maintaining manageable scheduling complexity through structured resource allocation
2Productivity
If a single frequency band is used for all transmissions, then device complexity and scheduling overhead are reduced, but bandwidth utilization and data throughput are insufficient
Solution Approach 1:
The patent introduces frequency band dimension to resource allocation, enabling simultaneous transmissions across multiple frequency bands. This dimensional expansion increases bandwidth utilization from single-band sequential access to multi-band parallel access, achieving higher throughput while distributing scheduling complexity across frequency dimensions
Solution Approach 2:
The patent creates a universal scheduling framework that handles multiple frequency bands with a unified resource allocation mechanism. The access point simultaneously manages scheduling across different frequency bands, allowing the system to adapt to varying bandwidth requirements of different user terminals while maintaining a single coordinated control structure
3Adaptability or versatility
If different modulation-coding schemes (MCS) are used for different user terminals, then adaptability to varying signal-to-noise ratios is improved, but training overhead and system complexity increase
Solution Approach 1:
The patent performs channel estimation and MCS selection in advance during the preamble phase before actual data transmission. By completing training and adaptation procedures beforehand, the system establishes appropriate MCS for each user terminal without causing time loss during data transmission, as all necessary channel characterization and parameter optimization are performed during the initial training period
Data Source
AI summary
Certain aspects of the present disclosure relate to a method for enhanced multichannel access where multiple simultaneous transmissions can occur each spanning a subset of frequency bands.