Self-optimizing Uplink Outer Loop Power Control for WCDMA Network

• Main Authors: A. G. Markoc, G. Sisul
• Format: Article
• Language: English
• Published: Spolecnost pro radioelektronicke inzenyrstvi 2015-06-01
• Series: Radioengineering
• Subjects: WCDMA; outer loop power control; uplink received signal strength indicator (UL RSSI); maximum allowed signal to interference ratio (sirMax); transmission target error (TTE)
• Online Access: http://www.radioeng.cz/fulltexts/2015/15_02_0499_0506.pdf

The increasing demands for high data rates, drives the efforts for more efficient usage of the finite natural radio spectrum resources. Existing wideband code division multiple access (WCDMA) uplink outer loop power control has difficulty to answer to the new load on air interface. The main reason is that the maximum allowed noise rise per single user is fixed value. In worst case uplink load can be so high that all services, including conversational service, could be blocked. In this paper investigation has been performed to present correlation of main system parameters, used by uplink outer loop power control, to uplink load. Simulation has been created and executed to present difference in current implementation of uplink outer loop power control against proposed changes. Proposed solution is self-optimizing uplink outer loop power control in a way that maximum allowed noise rise per single user would be dynamically changed based on current uplink load on cell.