External ring power control method and system in CDMA system

Abstract

This invention provides an outer ring power control method and a system when multiple services are multiplexed on a same physical channel in a CDMA system including: defining the PRI of various services for the outer ring power control based on the SIR target value necessary for the service and the higher the demand on the SIR target value the higher the PRI is, in which, the services generate their own target SIR adjustment orders based on the target values of the received signals and service qualities and merge the target SIR adjustment orders of all services to generate final target SIR adjustment orders, in which, when there is no order demanding SIR to be adjusted upward but there is the order demanding downward, a final target SIR adjustment order is generated based on the defined PRI then to refresh the SIR target value based on the final target SIR adjustment order.

Description

technical field [0001] The invention relates to an outer loop power control method in a code division multiple access (CDMA) system, in particular to an outer loop power control method and system when multiple services are multiplexed on the same physical channel in the CDMA system. technical background [0002] In a CDMA system, the performance of the system, such as capacity and coverage, depends largely on the interference received by users. Among them, power control technology, as an effective means to reduce inter-channel interference, has become a kind of CDMA communication system. key technologies. [0003] In the CDMA system, power control is divided into open-loop power control and closed-loop power control. The open-loop power control is a rough estimate of channel fading, while the closed-loop power control can effectively track the rapid fading of the signal. Closed-loop power control includes two parts: inner-loop power control and outer-loop power control. Th...

AI Technical Summary

Problems solved by technology

Based on the technical solution of this patent, it can prevent the local SNIR target value of those required SNIR target values ​​from continuously decreasing over-control, but there are still the following problems: 1) For those services with a lower required SNIR target value 2) When the service with the highest required SNIR target value is in the silent period, the required public SNIR target value will be reduced due to the change of the transmission format. value changes, if the required public SNIR target value is lower than the previous public SNIR target value at this time, because the local SNIR of the business with the highest required SNIR target value remains unchanged, the output public SNIR target value cannot be reduced, thereby increasing the System interference reduces the system capacity; if the required public SNIR target value at this time is higher than the previous public SNIR target value, the local SNIR target value of other services is low and cannot quickly climb to the actual required public SNIR target value, resulting in communication The quality deteriorates and cannot meet the user's QoS requirements

Based on the technical solution of this patent, the over-control problem of the local SIR target value of various services is avoided, but there are still the following deficiencies: 1) Whether the communication quality of the service meets its QoS requires a long measurement period to obtain a relatively reliable As a result, it is difficult to dynamically select a service as the benchmark of outer loop power control, and its outer loop power control performance is also difficult to be guaranteed; 2) when some services are switched between active and silent states, Due to the change of the transmission format, the required public SIR target value will change greatly. Based on the technical solution of this patent, it is impossible to quickly track the change of the actual required public SIR target value in this case, so that a good outer ring cannot be obtained. Power Control Performance

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