Contact Us. UMTS Power Control. Open loop power control is the ability of the UE transmitter to sets its output power to a specific value. It is used for setting initial uplink and downlink transmission powers when a UE is accessing the network.
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What is power control in UMTS?
Contact Us. UMTS Power Control. Open loop power control is the ability of the UE transmitter to sets its output power to a specific value. It is used for setting initial uplink and downlink transmission powers when a UE is accessing the network.
Why power control is required in UMTS?
Fast power control is important in keeping interference to a minimum and improving capacity. Without it, transmit power would have higher to meet quality targets. The gain from this control is as much as 5.8 dB at the receiver for pedestrian speeds for 8kbps speech with 10ms interleaving and antenna diversity.
What type of power control is applied in WCDMA UMTS?
closed-loop PC
Power control in WCDMA is a closed-loop PC which is a combination of outer and inner closed loop control (see Figure 1). The inner (also called fast) closed loop PC adjusts the transmitted power in order to keep the received Signal-to-Interference Ratio (SIR) equal to a given target.
What is outer loop power control in WCDMA?
The Outer Loop Power Control (OLPC) in WCDMA systems allows to achieve a defined Quality of Service (QoS) for every link. This reduces resources and interference, hence, increases the system-wide throughput.
What is inner loop control?
Inner loop power control in the uplink is the ability of the UE to adjust its output power in accordance with one or more TPC (transmit power control) commands received in the downlink. When the UE is not in soft handover, only one TPC command is received in each timeslot.
What are the five IMT 2000 technologies?
IMT Direct Spread (IMT-DS; also known as UMTS/UTRA-FDD); IMT Multicarrier (IMT-MC; also known as CDMA2000); IMT Time Code (IMT-TC; also known as UMTS/UTRA-TDD, TD-CDMA and TD-SCDMA “narrowband TDD”); IMT Single Carrier (IMT-SC; also known as UWC-136 or EDGE);
Which codes are used to spread the signal in Wcdma?
The codes required to spread the signal must be orthogonal if they are to enable multiple users and channels to operate without mutual interference. The codes used in W-CDMA are Orthogonal Variable Spreading Factor (OVSF) codes, and they must remain synchronous to operate.
What is CDMA power control?
In CDMA, since all the mobiles transmit at the same frequency, the internal interference of the network plays a critical role in determining network capacity. Further, each mobile transmitter power must be controlled to limit the interference. Power control is essentially needed to solve the near-far problem.
What is UMTS architecture?
UMTS system uses the same core network as the GPRS and uses entirely new radio interface. The new radio network in UMTS is called UTRAN (UMTS Terrestrial Radio Access Network) and is connected to the core network (CN) of GPRS via Iu interface.