Dual Connectivity Interference Avoidance via DRX Configuration
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Solution Overview
Problem
Current 3GPP LTE systems fail to provide effective in-device co-existence interference avoidance for user equipment operating in dual connectivity due to signaling limitations and system frame number timing offsets between master and secondary nodes, leading to impaired performance from simultaneous use of multiple wireless technologies.
Innovation Solution
The implementation of enhanced DRX configuration parameters and HARQ bitmaps that account for SFN timing offsets between master and secondary nodes, allowing for autonomous denial of LTE uplink transmission and configuration of frequency-division multiplexing or time-division multiplexing solutions to mitigate interference, with the UE reporting IDC assistance information to enable appropriate DRX configuration for interference resolution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If dual connectivity is implemented to improve data rates and network flexibility, then network performance and adaptability are improved, but in-device co-existence interference occurs between LTE and WLAN transceivers
Solution Approach 1:
The patent implements periodic action by configuring DRX (Discontinuous Reception) parameters that periodically switch the LTE transceiver between active and sleep states. This periodic operation allows the LTE and WLAN transceivers to share the device's antenna resource without simultaneous operation, thereby eliminating in-device co-existence interference while maintaining dual connectivity capabilities for improved data rates
2Reliability
If LTE uplink transmission is continuously active to maintain connection quality, then connection reliability is improved, but interference with WLAN transmission increases
Solution Approach 1:
The patent applies periodic action by configuring DRX parameters that create periodic intervals where LTE uplink transmission is suspended. During these intervals, WLAN transmission can occur without interference from the LTE transceiver. The DRX cycle maintains connection reliability by periodically re-establishing LTE uplink transmission while avoiding continuous interference to WLAN
Solution Approach 2:
The patent implements preliminary action by proactively configuring DRX parameters and HARQ bitmaps before interference occurs. The network node receives assistance information from the device indicating potential interference scenarios, and preemptively configures appropriate DRX parameters to prevent interference before it happens, rather than reacting after interference has occurred
3Object-affected harmful factors
If DRX parameters are configured to avoid interference, then in-device co-existence is improved, but signaling complexity and configuration overhead increase
Solution Approach 1:
The patent applies self-service by enabling the user device to autonomously determine and report assistance information regarding in-device co-existence interference scenarios. The device self-evaluates its interference conditions and provides this information to the network node, which then configures appropriate DRX parameters. This reduces signaling complexity compared to the network needing to query and configure all possible parameters manually
Solution Approach 2:
The patent implements parameter changes by dynamically adjusting DRX parameters (such as drx-OnDurationTimer, drx-SlotOffset, drx-InactivityTimer) based on the reported assistance information. The network node modifies these parameters to match the specific interference scenario detected by the device, optimizing interference avoidance while minimizing unnecessary configuration overhead for non-interfering scenarios
Data Source
AI summary
Systems and methods disclosed herein provide in-device co-existence interference avoidance for a wireless communication device in dual connectivity with a master node and a secondary node. Time-division multiplexing (TDM) assistance information sent by the wireless communication device is forwarded from the master node to the secondary node. The master node and/or the secondary node uses the TDM assistance information to determine a TDM solution for the in-device co-existence interference in the wireless communication device.