Aperiodic Beacon Transmission for LTE-U Interference Management
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Solution Overview
Problem
LTE-Unlicensed networks face interference and communication issues due to periodic reference signaling messages, which can affect coexistence with WiFi and Bluetooth devices and result in incomplete transmission in unlicensed spectrum compared to licensed bands.
Innovation Solution
Implementing an aperiodic beacon signal transmission mechanism by eNBs, allowing for flexible timing and band selection to minimize interference, using a trigger signal to indicate when reference signals and data are transmitted in the unlicensed band, and employing a new RNTI for UE-specific communication.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If periodic reference signaling messages are transmitted in unlicensed spectrum, then channel estimation and scheduling transmissions can be performed, but interference and disturbances to coexisting WiFi and Bluetooth devices occur
Solution Approach 1:
The patent applies periodic action by transmitting reference signals at specific periodic intervals rather than continuously. The eNB configures UEs with periodic reference signal transmissions in unlicensed spectrum, allowing channel estimation to be performed at regular intervals while leaving gaps that reduce interference to coexisting WiFi and Bluetooth devices.
Solution Approach 2:
The patent implements dynamics by making reference signal transmission configurable and adaptable. The network can dynamically adjust reference signal parameters including periodicity, bandwidth, and timing based on traffic conditions and interference levels, allowing the system to optimize between estimation accuracy and coexistence requirements.
2Reliability
If periodic reference signaling messages are transmitted in unlicensed spectrum, then tracking in time and frequency can be enabled, but transmission completeness cannot be guaranteed due to unlicensed band nature
Solution Approach 1:
The patent applies feedback mechanisms where UEs report channel quality indicators (CQI) and channel state information (CSI) based on received reference signals. The eNB uses this feedback to adjust transmission parameters, configure retransmissions, and adapt reference signal periodicity to maintain reliable tracking despite potential signal loss in unlicensed spectrum.
Solution Approach 2:
The patent implements preliminary action by performing channel estimation and quality assessment using reference signals before actual data transmissions. This allows the system to predict channel conditions and prepare appropriate transmission parameters in advance, reducing the impact of potential signal loss during actual data transfer.
3Object-affected harmful factors
If aperiodic beacon signal transmission is implemented with flexible timing, then interference to other devices is minimized, but system complexity increases
Solution Approach 1:
The patent applies parameter changes by allowing flexible adjustment of beacon signal transmission parameters including timing, periodicity, and bandwidth. The system can dynamically modify these parameters based on traffic conditions and interference levels, enabling aperiodic transmissions that minimize interference while managing complexity through standardized parameter sets.
Data Source
AI summary
An enhanced NodeB (eNB), user equipment (UE) and method of communicating using Long Term Evolution (LTE) licensed and unlicensed bands are generally described herein. The eNB may transmit a trigger signal to the UE. The trigger signal may be transmitted in the LTE unlicensed or licensed band and inform the UE of transmission of a reference signal from the eNB to the UE in the unlicensed band. The trigger signal may correspond to a single reference signal transmission or multiple periodic or consecutive reference signal transmissions. The trigger signal or a separate trigger signal may be used to inform the UE of a data transmission. The trigger signal may be transmitted at any point prior to or in the same subframe as the reference signal and the reference signal may be transmitted before, after or in the same subframe as the data.