What is power control LTE?

Abstract: Uplink power control is a key radio resource management function. It is typically used to maximize the power of the desired received signals while limiting the generated interference. The LTE power control mechanism constitutes of a closed loop component operating around an open loop point of operation.

Does power control used in LTE DL Pdsch?

Downlink Rate Control (Power Control) In case of 4G LTE Downlink , rather than varying power in the Downlink, full power is distributed uniformly over the whole bandwidth. The same Power Spectral Density (PSD) is used on all DL channels. For example, PDSCH, PHICH, PDCCH etc.

What is open loop and closed loop in LTE?

In Open Loop Control, UE determines its Transmission Power by its own Power Setting Algorithm. It means UE Transmission Power is controled by some feedback input from eNB. In this way, overall power control process form a loop (closed loop). That’s why it is called Closed Loop Control.

What is uplink power control in LTE?

Uplink power control is a key radio resource management function. It is typically used to maximize the power of the desired received signals while limiting the generated interference. The LTE power control mechanism constitutes of a closed loop component operating around an open loop point of operation.

What is closed loop control?

Closed Loop Power Control (CLPC) Measurement Description. Closed Loop Power Control (CLPC) measurement, as defined in TS 34.122 Section 5.4. 1.4, is used to test the ability of the UE transmitter to adjust its output power in accordance with one or more TPC commands received in the downlink.

What happens when a LTE UE is powered on?

A UE performs cell search on all frequencies before selecting or re-selecting to a cell. In an LTE system, two types of synchronization signals for cell search: primary synchronization signals (PSS) and secondary synchronization signals (SSS).

Why is power control needed in case of LTE?

Conventional Power control is used in attempt to maintain a constant Signal to Interference plus Noise Ratio (SINR) at the receiver. UE increases their transmit power to fully compensate any increase in path loss.

What is the difference between open loop and closed loop control?

The main difference between open-loop and closed-loop control system is, the required output within the open loop doesn’t depend on the controlled act whereas, in closed-loop, the required output mainly depends on the controlled act.

What is Alpha in LTE?

PL = Estimated Downlink Path Loss. α = Factor to enable or disable Fractional Power Control (also termed as Cell Specific factor)

What are the advantages of closed loop control system?

Closed loop control systems are more accurate even in the presence of non-linearities. The sensitivity of the system may be made small to make the system more stable. The closed loop systems are less affected by noise.

What is the difference between open and closed loop control?

How does open loop power control work in LTE?

Whether Open Loop Power control is done using Fractional or Conventional Power Control scheme. It depends on the if they enable Fractional Power control or disable it. If fractional power scheme is used , it forms the Open Loop component of power control. Open loop power control can maintain target PSD as received by the eNodeB.

Which is the UE power control for LTE?

PUSCH PUSCHTPC Command Accumulated [dB] Absolute [dB] 0 -1 -4 1 0 -1 2 1 1 3 3 4 UL Power control (PUSCH) – Closed loop PUSCH is set according to: 14. UL Power Control (PUCCH) – Open loop UE transmit power for PUCCH transmission：  is the maximum allowable UE power;  PL is the downlink pathloss, estimated by UE.

Which is the closed loop state in ul power control?

UL Power Control (PUCCH) – Closed loop  g (i) is the current PUCCH power control adjustment state, similar as PUSCH (accumulation enabled), using parameter to calculate.PUCCH 16.

What is the role of closed loop power interference?

Therefore, the role of a closed-loop power interference caused to neighboring cells. mobile broadband technologies such as LTE. The battery power is an important and scarce resource in these devices. Thus, the application of an efficient power control use the available resources efficiently. closed-loop mechanism.