Power Overload Control in Communication Systems
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Solution Overview
Problem
Conventional power control methods in CDMA and UMTS communication systems are ineffective in managing power overload situations, leading to unstable network operations and unexpected connection drops due to rapid increases in interference and transmit power, especially in high-load regions.
Innovation Solution
Implementing a power overload control method that adjusts the target signal-to-interference ratio (SIRtarget) and block error rate (BLERtarget) to maintain the communication system loading below overload conditions, using a power overload control loop that estimates cell loading and adjusts SIRtarget and BLERtarget dynamically to prevent overload, thereby reducing the need for drastic measures like call blocking or dropping.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional power control methods are used in high-load regions, then power control adjustment is performed, but rapid increases in interference and transmit power occur leading to unstable network operations and unexpected connection drops
Solution Approach 1:
The invention performs preliminary action by detecting overload conditions before they cause network instability. The base station monitors system load and detects overload states, then proactively adjusts power control parameters (SIRtarget or BLERtarget) to prevent rapid increases in interference and transmit power, thereby avoiding connection drops and maintaining network stability.
2Productivity
If target SIR or BLER is adjusted to manage overload, then system capacity is enhanced, but quality of service is temporarily degraded
Solution Approach 1:
The invention applies dynamics by making the power control parameters (SIRtarget or BLERtarget) adjustable and adaptive. During overload conditions, the base station dynamically modifies these parameters to manage system capacity and prevent instability. When overload subsides, the parameters are restored to their original values, allowing the system to flexibly respond to changing load conditions while minimizing long-term quality degradation.
Data Source
AI summary
Methods of providing power overload control in a communication system having a least one base station serving one or more users of at least one cell are described which may avoid an overload condition in the system. In one aspect, a target signal-to-interference ratio (SIRtarget) may be controlled for inner loop power control implemented by the base station, so as to maintain the loading of the communication system below an overload condition. In another aspect, a target block error rate (BLERtarget) may be controlled for outer loop power control implemented by the base station, so as to maintain the loading of communication system below an overload condition.