Transceiver Time Slot Segregation for LTE-U and Wi-Fi Coexistence
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Solution Overview
Problem
The coexistence of LTE-U small cells with Wi-Fi in unlicensed frequency bands leads to excessive radio-frequency interference due to unplanned deployments, and the scheduling of buffered data in cellular-telephone communication protocols is incompatible with contention-based protocols like Wi-Fi, resulting in mutual interference and inefficient data transmission.
Innovation Solution
An electronic device transmits a first type of traffic in a shared unlicensed frequency band, reserves time for a second type of traffic, and synchronizes their periodicities to prevent interference, using a request-to-send (RTS) packet to reserve time and a clear-to-send (CTS) confirmation to ensure segregated transmission, allowing synchronized transmission of both types of traffic without mutual interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If LTE-U small cells are deployed in unlicensed frequency bands to provide data services, then data transmission capability is improved, but radio-frequency interference with Wi-Fi and other LTE-U nodes increases
Solution Approach 1:
The patent segments the unlicensed frequency band into dedicated time slots for different communication protocols. By dividing the shared spectrum into temporal segments, LTE-U and Wi-Fi transmissions are separated in time, allowing both protocols to operate simultaneously without mutual interference while maintaining efficient use of the frequency band.
Solution Approach 2:
The patent implements periodic time slot allocations where LTE-U and Wi-Fi transmissions occur in alternating periodic intervals. This periodic segmentation of the frequency band over time enables predictable, recurring access patterns that prevent interference while maintaining continuous service availability for both protocols.
2Productivity
If schedule-based communication protocol is used to manage buffered data transmission, then transmission efficiency is improved, but compatibility with contention-based protocols like Wi-Fi deteriorates
Solution Approach 1:
The patent segments the communication management function into separate time slots: one segment for schedule-based LTE-U data transmission and another segment for contention-based Wi-Fi transmissions. This temporal segmentation allows each protocol to operate in its optimal mode without interference, achieving both transmission efficiency and protocol compatibility.
Solution Approach 2:
The patent creates a dynamic time-division framework where the allocation of time slots can adapt to different traffic conditions. The system dynamically switches between schedule-based and contention-based access modes depending on the current network state, enabling efficient utilization of both protocols while maintaining their distinct operational characteristics.
Data Source
AI summary
An electronic device that transmits traffic in a wireless network is described. During operation, the electronic device transmits, using a first transceiver, a first type of traffic in a shared frequency band that is unlicensed. Then, the first transceiver reserves time for transmitting a second type of traffic in the shared frequency band. The reserved time may be determined in response to a request to reserve the time from a second transceiver in the electronic device transmitting the second type of traffic in the shared frequency band. Next, the first transceiver permits, in the reserved time, transmission by the second transceiver of the second type of traffic in the shared frequency band. Furthermore, the first transceiver prevents transmission of the first type of traffic during the reserved time, thereby segregating the first type of traffic from the second type of traffic in the shared frequency band.