WiFi Error Correction for Periodic LTE Signaling Interference
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Solution Overview
Problem
LTE wireless communications interfere with WiFi systems due to continuous operation in the same RF band, causing interference and making it difficult for WiFi to sense clear channels for transmission, especially with periodic LTE reference signals disrupting WiFi signaling.
Innovation Solution
A system that includes a processor to detect errors in WiFi communications and determine their periodicity based on LTE signaling, using an encoder to adjust error correction accordingly, enhancing WiFi communications by increasing error correction during LTE reference signal transmissions and reducing it when interference is minimal.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If LTE operates continuously at pre-defined power level in the same RF band as WiFi, then LTE coverage requirements are met, but WiFi channel sensing capability deteriorates and transmission opportunities are lost
Solution Approach 1:
The patent implements dynamic power adjustment for LTE base stations by introducing a power control mechanism that modulates transmit power according to a predetermined pattern (e.g., sinusoidal waveform). This creates dynamic power variations that allow WiFi systems to detect clear channel conditions during low-power LTE intervals, enabling WiFi transmissions while maintaining LTE coverage through averaged power levels.
2Reliability
If LTE transmits reference symbols periodically, then LTE channel estimation is maintained, but WiFi signaling interference increases
Solution Approach 1:
The patent applies periodic action by scheduling LTE reference symbol transmissions at specific intervals that are coordinated with WiFi transmission opportunities. The LTE base station transmits reference symbols periodically but adjusts the timing and power levels to create predictable interference patterns that WiFi systems can anticipate and handle through their existing interference mitigation mechanisms.
Solution Approach 2:
The patent implements preliminary action by having WiFi systems detect and identify LTE reference symbol transmission patterns before actual WiFi transmissions occur. This allows WiFi devices to pre-adjust their transmission parameters, power levels, or timing to avoid or mitigate the expected interference from upcoming LTE reference symbol transmissions.
3Adaptability or versatility
If WiFi uses channel sensing and random backoff for coexistence, then WiFi can operate in shared spectrum, but LTE continuous transmission prevents clear channel detection
Solution Approach 1:
The patent implements preliminary anti-action by having LTE base stations proactively reduce transmit power during intervals when WiFi channel sensing is expected to occur. This preemptive power reduction creates clear channel conditions that allow WiFi devices to successfully perform their clear channel assessment (CCA) and proceed with transmissions, thereby maintaining both LTE and WiFi operations in the shared spectrum.
Data Source
AI summary
Systems and methods presented herein enhance WiFi communications in a RF band where conflicting LTE signaling exists. In one embodiment, a system includes a processor operable to detect the WiFi communications between a UE and a wireless access point of a WiFi network, to identify errors in the WiFi communications, and to determine a periodicity of the errors based on the LTE signaling structure. The system also includes an encoder communicatively coupled to the processor and operable to encode the WiFi communications with error correction, and to change the error correction based on the periodicity of the errors in the WiFi communications.