Time-Frequency Scheduling for Multi-Radio Coexistence
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Solution Overview
Problem
Conventional LTE systems face coexistence issues due to interference between radios, particularly with Bluetooth and WLAN devices operating in the ISM band, as the eNB is not adequately aware of interference on the UE side, leading to unresolved uplink coexistence problems that degrade performance and efficiency.
Innovation Solution
A method and apparatus for receiving indications of time and frequency resources of future activity in mobile wireless service (MWS) radio access technology, allowing for scheduling of wireless connectivity network (WCN) radio access technology communications to mitigate interference by coordinating radio behavior based on dynamic resource allocation information.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If LTE uplink transmission is performed in ISM band adjacent channels, then LTE communication performance is improved, but interference to Bluetooth and WLAN radios is caused
Solution Approach 1:
The system performs preliminary actions by having the UE report uplink interference conditions to the eNB before handover decisions are made. The eNB uses this advance information to proactively select target frequency channels that avoid interference, preventing the interference problem before it occurs rather than reacting after interference is detected
Solution Approach 2:
The system implements feedback mechanisms where the UE measures and reports uplink interference conditions to the eNB. This feedback loop enables the eNB to make informed handover decisions based on actual interference conditions, allowing the system to adapt and optimize frequency channel selection to avoid interference with ISM band radios
2Ease of operation
If the eNB uses RSRP reports for handover decisions, then network control over frequency channel selection is maintained, but ping-pong effect occurs due to lack of awareness of uplink interference
Solution Approach 1:
The system enhances feedback by including uplink interference measurement reports from the UE alongside RSRP reports. This comprehensive feedback enables the eNB to maintain network control while making handover decisions that account for both signal strength and interference conditions, preventing unstable ping-pong handovers
Solution Approach 2:
The uplink interference measurement report acts as an intermediary information element that bridges the gap between UE-side interference conditions and eNB decision-making. This intermediate feedback mechanism allows the eNB to understand uplink interference without compromising its control authority over handover decisions
3Object-affected harmful factors
If UE performs unilateral action to avoid interference by switching channels, then local interference problem is temporarily resolved, but eNB may handover UE back to corrupted channel
Solution Approach 1:
The system implements feedback by having the UE report uplink interference conditions to the eNB. This enables the eNB to make informed handover decisions that prevent the UE from being handed over back to corrupted channels, stabilizing the connection while maintaining interference avoidance
Solution Approach 2:
The interference report mechanism serves as an intermediary communication channel between the UE and eNB, allowing the UE to convey interference information without directly controlling handover decisions. This maintains network authority while ensuring interference-aware handover planning
Data Source
AI summary
A user equipment (UE) uses information regarding dynamic resource allocation in a mobile wireless service (MWS) radio access technology (RAT) to improve MWS and wireless connectivity network (WCN) RAT coexistence. The UE may receive an indication of time and frequency resources of future activity of the MWS RAT. The UE may schedule communications of the WCN RAT based at least in part on the indication of the time and frequency resources of the future activity.