UE Coexistence Issue Reporting for LTE-Bluetooth Interference
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Solution Overview
Problem
Conventional LTE systems face coexistence issues due to interference between radios, particularly with Bluetooth and WLAN, 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 User Equipment (UE) identifies and reports coexistence issues to the eNB, providing information on affected resources, alternative configurations, and modified Channel Quality Indicator (CQI) and Power Headroom Report (PHR) to facilitate mechanisms that mitigate interference, such as handovers, measurement gap patterns, and discontinuous reception (DRX) cycles.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If LTE uplink transmission is performed simultaneously with Bluetooth or WLAN, then communication functionality is provided, but interference occurs between radios causing unacceptable error rates and service disruption
Solution Approach 1:
The system performs preliminary identification of coexistence issues between LTE and other radios (Bluetooth, WLAN) before interference occurs. The UE detects potential interference conditions and reports them to the eNB in advance, allowing the network to take preventive actions such as channel changes or parameter adjustments before actual interference degrades communication reliability.
Solution Approach 2:
The patent implements a feedback mechanism where the UE monitors interference conditions between different radios and provides continuous feedback to the eNB. Based on this feedback, the eNB adjusts LTE transmission parameters, frequency channels, or scheduling to mitigate interference, thereby maintaining both multi-radio operation capability and communication reliability.
2Productivity
If the eNB uses RSRP reports to inform handover decisions, then network optimization is achieved, but ping-pong effect occurs between corrupted and desired channels
Solution Approach 1:
The patent introduces a coexistence issue report as an intermediary information element that mediates between the UE's actual interference experience and the eNB's handover decisions. This additional information layer allows the eNB to distinguish between poor RSRP caused by interference versus poor RSRP caused by channel quality, preventing premature handovers that would cause ping-pong effects.
Solution Approach 2:
The system performs preliminary identification of coexistence issues and their impact on channel quality before making handover decisions. By detecting and reporting interference conditions in advance, the eNB can account for these conditions when evaluating RSRP reports, thereby avoiding handovers that would result in ping-pong effects between corrupted and desired channels.
3Measurement precision
If downlink interference estimation is performed at the eNB, then downlink coexistence issues are addressed, but uplink coexistence issues remain unresolved
Solution Approach 1:
The patent inverts the traditional interference reporting approach by having the UE directly report uplink interference conditions to the eNB, rather than relying on the eNB to estimate uplink interference from downlink measurements. This inversion allows the UE to provide direct feedback about uplink coexistence issues, enabling the network to address both downlink and uplink interference problems effectively.
Data Source
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AI summary
A method of wireless communication includes identifying one or more coexistence issues corresponding to a utilized set of communication resources of a User Equipment (UE). The method also includes communicating an indication of the coexistence issue(s) to a serving base station.