UMTS Link Connection Release Synchronization
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
In UMTS cellular radio systems, a spike in uplink power from user equipment (UE) during the CELL_DCH release procedure can cause uplink interference with other UEs until the uplink switches off, due to misinterpretation of downlink noise as a 'power up' command, leading to inefficient release procedures.
Innovation Solution
The method involves the UTRAN sending a link connection release message and monitoring uplink power or waiting for completion messages to ensure the uplink is released before downlink, or switching to acknowledgement mode or reconfiguring to CELL_FACH state to avoid power spikes, thereby synchronizing the release of uplink and downlink channels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If the downlink is released before the uplink during CELL_DCH release procedure, then the release procedure is faster, but uplink interference occurs due to power spikes from misinterpretation of downlink noise as power up commands
Solution Approach 1:
The patent applies preliminary action by having the UTRAN monitor the uplink power level before releasing the downlink. This monitoring phase detects whether the UE is in a high power state that would cause interference, and only proceeds with downlink release when the uplink power is confirmed to be low, thus preventing interference while maintaining efficient release timing
Solution Approach 2:
The patent implements feedback by having the UTRAN continuously monitor uplink power levels from the UE during the release procedure. This real-time feedback allows the UTRAN to detect power spikes caused by misinterpretation of noise as power up commands, and to delay downlink release until the UE transitions to a low power state, thereby eliminating interference
2Object-generated harmful factors
If the uplink is released before the downlink, then uplink interference is reduced, but the release procedure becomes less efficient and takes longer
Solution Approach 1:
The patent applies preliminary action by having the UTRAN monitor uplink power levels before initiating downlink release. This preliminary monitoring phase ensures that the UE has already transitioned to a low power state, so when the downlink is subsequently released, no interference occurs and the overall procedure remains efficient
Solution Approach 2:
The patent uses feedback mechanisms where the UTRAN receives continuous power level reports from the UE. This feedback allows the UTRAN to precisely determine when the UE has entered a low power state and can safely proceed with downlink release, optimizing the timing to achieve both interference reduction and procedural efficiency
3Object-generated harmful factors
If the UTRAN waits for completion messages from UE, then interference is minimized, but the release procedure duration increases
Solution Approach 1:
The patent implements feedback by having the UE send completion messages to the UTRAN indicating when it has transitioned to a low power state. The UTRAN uses this feedback to determine the optimal timing for downlink release, ensuring interference is minimized while avoiding unnecessary waiting time
Solution Approach 2:
The patent applies preliminary action by having the UE proactively send completion messages that inform the UTRAN when it is safe to release the downlink. This allows the UTRAN to plan and execute the downlink release at the precise moment when interference will not occur, optimizing both interference reduction and timing efficiency
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 in a second direction a link connection release message for a link connection in the first direction, identifies when the link connection in the first direction is released and, when the release is identified, releases the link connection in the second direction.