WCDMA Power Control Suspension for Intermittent Traffic
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Solution Overview
Problem
Current WCDMA communication systems face inefficiencies in power control overhead, especially for intermittent traffic, leading to increased interference, reduced battery life, and limited system capacity due to continuous transmission of power control signals, which is not optimized for long periods of inactivity followed by short data transmissions.
Innovation Solution
A No-TX mode of operation is introduced where Transmission Power Control commands are suspended on dedicated channels, allowing WTRUs and Node Bs to reduce power control updates and signaling, with defined triggers and resource persistence options to maintain configuration and resume transmissions efficiently, thereby reducing latency and signaling overhead.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If continuous power control loop is maintained in CELL_DCH state, then power control accuracy is improved, but power consumption and interference increase
Solution Approach 1:
The patent implements Discontinuous Transmission (DTX) and Discontinuous Reception (DRX) mechanisms that periodically suspend power control loop operations during idle periods. The system alternates between active power control phases and suspended phases, reducing power consumption while maintaining control accuracy when transmissions are actually occurring. This periodic suspension allows the power control loop to be maintained only when necessary for data transmission.
2Measurement precision
If continuous power control loop is maintained in CELL_DCH state, then power control accuracy is improved, but system capacity decreases
Solution Approach 1:
By implementing periodic suspension of power control loops through DTX and DRX, the system reduces the continuous occupation of code resources and power control channel capacity. This allows more users to share the available system resources, thereby increasing overall system capacity while maintaining power control accuracy during active transmission periods.
Solution Approach 2:
The patent allows the system to temporarily discard (suspend) power control loop configurations during idle periods and quickly recover (reactivate) them when data transmission is needed. This discarding and recovering mechanism frees up code resources and reduces interference during idle times, enabling more efficient resource utilization and higher system capacity.
3Speed
If continuous power control loop is maintained, then power control responsiveness is improved, but battery life decreases
Solution Approach 1:
The DTX and DRX mechanisms create periodic cycles where power control loops are suspended during idle periods and reactivated for data transmission. This periodic operation dramatically reduces battery power consumption during idle times while maintaining the capability for rapid power control response when transmissions occur, thus extending battery life without sacrificing responsiveness during active use.
4Loss of energy
If DTX and DRX modes are used, then power consumption is reduced, but latency increases for intermittent traffic
Solution Approach 1:
The patent configures DTX and DRX parameters in advance based on traffic patterns, pre-establishing the suspension and resumption timing. This preliminary configuration allows the system to anticipate idle periods and proactively suspend power control loops before data transmissions occur, reducing power consumption while ensuring that power control is already prepared and can be quickly reactivated, thereby minimizing latency when data arrives.
Data Source
AI summary
A method and apparatus for requesting and releasing resources for a wireless transmit/receive unit (WTRU) and/or Node B. The WTRU may transmit a channel acquisition request to the Node B and receive a resource allocation from the Node B. The resource allocation may include a common resource. The WTRU may release the common resource. The release may be based on one or more conditions. The channel acquisition request or the resource allocation may include information related to one or more channels or resources.