UTRAN Downlink Release Timing for Uplink Interference Mitigation
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Solution Overview
Problem
In UMTS cellular radio systems, a spike in uplink power from user equipment during the CELL_DCH release procedure can cause uplink interference with other user equipment until the uplink switches off, which existing methods fail to adequately mitigate.
Innovation Solution
The proposed method involves the UTRAN releasing the downlink channel only after confirming the uplink channel has been released, using various approaches such as monitoring uplink power, waiting for a calculated time, or switching to acknowledgement mode to prevent excessive retransmissions and power spikes, thereby ensuring the downlink is released after the uplink has been fully disconnected.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the UTRAN releases the downlink channel immediately without confirming uplink release, then the release procedure is faster, but uplink interference occurs due to power spikes from user equipment
Solution Approach 1:
The UTRAN monitors uplink power levels or receives confirmation from the user equipment before releasing the downlink channel. This feedback mechanism ensures that the uplink has been properly released by the user equipment, preventing power spikes and interference while maintaining efficient resource release.
Solution Approach 2:
The system performs preliminary checks or transitions to acknowledgement mode before final downlink release. By preparing the user equipment in advance through mode switching or power monitoring, the system ensures smooth transition without interference while maintaining overall procedure efficiency.
2Object-generated harmful factors
If the UTRAN waits for uplink release confirmation before releasing downlink, then uplink interference is reduced, but the release procedure takes longer
Solution Approach 1:
The monitoring of uplink power or receipt of confirmation messages provides rapid feedback about uplink release status. This allows the UTRAN to quickly determine when it is safe to release the downlink channel, minimizing the waiting time while ensuring interference is prevented.
Solution Approach 2:
The system changes operational parameters such as switching to acknowledgement mode or adjusting power monitoring thresholds to accelerate the release confirmation process. These parameter changes enable faster verification of uplink release without compromising interference protection.
3Reliability
If the user equipment continues in dedicated channel state with power control, then communication quality is maintained, but power spikes occur during release causing interference to other users
Solution Approach 1:
The system switches to acknowledgement mode before final release, preparing the user equipment for channel transition. This preliminary action maintains communication reliability during the transition by using a more robust mode that doesn't rely on continuous power control, while preventing power spikes that would interfere with other users.
Solution Approach 2:
Instead of maintaining dedicated channel power control until the last moment and then releasing, the system inverts the approach by switching to acknowledgement mode first. This reversal ensures that power control is discontinued in a controlled manner, preventing interference while maintaining communication quality through the more robust acknowledgement mode.
Data Source
AI summary
A method and apparatus are described for reducing link interference by a link between a user equipment component and an access network component. The user equipment component and access network component are connected by links over dedicated channels in respective directions, the link channel power in the first direction being controlled by the link channel in the second direction. A component sends a reconfiguration message to the other component to reconfigure to a common channel state in which the link channel power in the first direction is independent of the link channel in the second direction.