Multi-Radio Coexistence Manager for LTE and ISM Interference
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Solution Overview
Problem
Conventional LTE systems face coexistence issues due to interference between radios, particularly with Industrial Scientific and Medical (ISM) bands, leading to unacceptable disruptions in voice services and power loop malfunctions, as the eNodeB is not adequately aware of uplink interference, resulting in unresolved coexistence problems that degrade performance and efficiency.
Innovation Solution
A method and apparatus that allow communications using a first radio access technology (RAT) while determining potential interference from a second RAT, allowing the User Equipment (UE) to autonomously declare a Radio Link Failure, switch to a new channel, and notify the eNodeB, thereby mitigating interference by implementing time division multiplexing (TDM) and power backoff techniques to avoid coexistence issues during connection setup.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If LTE and Bluetooth radios operate simultaneously in a multi-radio device, then the device provides diverse communication functions, but interference occurs between the radios causing unacceptable disruptions in voice services
Solution Approach 1:
The patent segments the operation of multiple radios by introducing a coexistence manager that divides time resources into dedicated periods for LTE and ISM band radios. This temporal segmentation prevents simultaneous operation that causes interference, allowing both LTE and Bluetooth to function reliably without mutual disruption
Solution Approach 2:
The patent implements periodic time-division multiplexing where LTE and ISM band radios operate in alternating time periods. The coexistence manager creates periodic patterns of LTE-active and ISM-active intervals, ensuring that each radio has dedicated time slots free from interference from the other radio type
2Reliability
If LTE uplink transmissions are increased to improve communication quality, then LTE performance is enhanced, but interference with ISM band radios (Bluetooth, WLAN) increases
Solution Approach 1:
The patent applies preliminary anti-action by having the coexistence manager proactively schedule ISM band operations during designated time periods before LTE uplink transmissions occur. This preemptive scheduling prevents interference from occurring in the first place, rather than attempting to mitigate it after the fact
Solution Approach 2:
The patent introduces dynamic resource allocation where the coexistence manager continuously monitors and adjusts the time-division multiplexing pattern based on current communication needs. The system can dynamically shift time slots between LTE and ISM band radios to optimize both LTE uplink quality and ISM band operation without fixed static allocation
3Productivity
If the eNodeB uses RSRP reports to make handover decisions, then network resource allocation is optimized, but ping-pong effect occurs between corrupted and desired channels due to lack of awareness of uplink coexistence issues
Solution Approach 1:
The patent implements feedback by having the UE report coexistence issue indicators to the eNodeB in addition to standard RSRP measurements. This feedback mechanism allows the eNodeB to understand when uplink interference is occurring and adjust handover decisions accordingly, preventing unnecessary handovers that would cause ping-pong effects
Solution Approach 2:
The patent introduces a coexistence manager as an intermediary layer between the UE's multiple radios and the network. This intermediary coordinates the operation of LTE and ISM band radios, providing the eNodeB with information about potential interference conditions so that handover decisions can be made with complete awareness of the current radio environment
4Reliability
If LTE downlink interference estimation is used to address coexistence issues, then some interference can be mitigated, but uplink coexistence issues remain unresolved because they are not reflected in downlink measurement reports
Solution Approach 1:
The patent transitions from only downlink interference measurement to a two-dimensional approach by adding uplink interference monitoring. The coexistence manager monitors both downlink and uplink interference conditions, creating a comprehensive interference awareness system that captures information from both transmission directions
Data Source
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AI summary
In a user equipment (UE) with multiple radio access technologies (RATs), communications of one RAT engaged in connection setup may be protected from communications of other RATs. Techniques for protecting such connection setups include performing power backoff on a potentially interfering RAT or implementing a time division multiplexing (TDM) solution alternating when certain RATs are active.