Frequency Multiplexing LAA and Wi-Fi OFDMA Transmissions
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Solution Overview
Problem
Current wireless communications systems face inefficiencies in using unlicensed radio spectrum due to asynchronous behavior of traditional Listen-Before-Talk schemes, leading to potential transmission failures under high traffic loads and inefficient spectrum utilization, especially when handling small data packets with low latency requirements.
Innovation Solution
The method involves frequency multiplexing LAA and Wi-Fi OFDMA transmissions on a shared radio channel by determining unallocated frequency bands, conducting contention procedures, and using a combination of legacy and High Efficiency preambles to optimize channel access, allowing for more efficient use of unlicensed spectrum.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional Listen-Before-Talk schemes are used in unlicensed spectrum, then channel access is controlled, but transmission failures occur under high traffic loads and spectrum utilization becomes inefficient
Solution Approach 1:
The patent segments the frequency spectrum into multiple subbands, allowing different networks (LAA and Wi-Fi) to transmit simultaneously on different subbands. This segmentation resolves the contradiction by enabling parallel transmissions that improve overall spectrum utilization while maintaining reliability through dedicated subband allocation.
Solution Approach 2:
The patent introduces frequency dimension multiplexing by allocating different subbands to different networks simultaneously. This dimensional approach allows both LAA and Wi-Fi transmissions to coexist in the same time period but on different frequency resources, thereby improving spectrum utilization without compromising transmission reliability.
2Productivity
If unlicensed spectrum is shared between LAA and Wi-Fi networks, then spectrum utilization improves, but interference and transmission conflicts increase
Solution Approach 1:
The patent divides the unlicensed spectrum into multiple subbands and assigns specific subbands to LAA and Wi-Fi networks. This segmentation reduces interference by ensuring that each network operates on dedicated frequency resources, allowing spectrum sharing without direct conflict.
Solution Approach 2:
The patent applies local quality by allowing different transmission characteristics and protocols in different subbands. LAA networks operate on assigned subbands with LTE-specific parameters while Wi-Fi networks operate on other subbands with IEEE 802.11 parameters, reducing mutual interference while maintaining high spectrum utilization.
3Loss of time
If small data packets are transmitted with low latency requirements, then service quality improves, but traditional LBT schemes cause delays due to asynchronous behavior
Solution Approach 1:
The patent implements preliminary action by pre-configuring subband allocations and establishing frequency multiplexing patterns before transmissions occur. This allows devices to quickly access pre-assigned subbands without undergoing lengthy LBT procedures, thereby reducing latency for small data packets while maintaining efficient channel access.
Solution Approach 2:
The patent introduces dynamic subband allocation that can adapt to varying traffic conditions. When small data packets with low latency requirements are detected, the system can dynamically allocate appropriate subbands and adjust transmission parameters to minimize access delays while maintaining ease of operation.
Data Source
AI summary
A wireless communications system and a method for frequency multiplexing a first (LAA) OFDMA transmission and a second (Wi-Fi) OFDMA transmission on a shared radio channel spanning at least partly a common bandwidth. The system determines an unallocated frequency band available beside a first frequency band intended for a first transmission and sends a sharing request comprising information about the unallocated band. The system decides to use the unallocated band in a second frequency band in the shared channel. The system sends a legacy preamble and a first part of a Wi-Fi preamble spanning the shared channel. The first transmission is sent in the first band such that an end time point of the first part of the Wi-Fi preamble coincides with a start time point of the first transmission. Further, the system sends a second part of the Wi-Fi preamble and the second transmission in the second band.