What is power control LTE?

What is power control LTE?

Power Control is the mechanism through which the UE and the eNodeB handle the attenuation of the signal. There are two types of Power Control mechanisms as per Control Theory and LTE uses both of them. They are: Open Loop Power Control. Closed Loop Power Control.

What is uplink power control in LTE?

In LTE, the standardized uplink power control formula contains an open loop component and a closed loop component. In open loop power control (OLPC), the transmitting power is set at the user equipment (UE) using parameters and measures obtained from signals sent by the base station.

What is open loop power control in LTE?

In Open Loop Control, UE determines its Transmission Power by its own Power Setting Algorithm. This Power Setting Algorithm takes in many inputs, but all of these inputs are from UE internal setting or measurement data by the UE. There is no feedback input from eNB.

What is open loop and closed loop in LTE?

The LTE power control mechanism constitutes of a closed loop component operating around an open loop point of operation. The open loop component compensates path loss and shadowing through fractional power control enabling a trade-off between cell edge throughput and mean cell throughput.

What is Pucch and Pusch?

The LTE uplink physical layer has a triplet of physical channels; Physical Uplink Shared Channel (PUSCH), Physical Uplink Control Channel (PUCCH) and Physical Random Access Channel (PRACH). The PUSCH is used for transmitting user traffic data in multiplex with Uplink Control Information (UCI), if necessary.

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 power headroom LTE?

What is Power Headroom? Power headroom indicates how much transmission power left for a UE to use in addition to the power being used by current transmission. Simply put, it can be described by a simple formula as below. Power Headroom = UE Max Transmission Power – PUSCH Power = Pmax – P_pusch.

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

The main difference between an open-loop system and a closed-loop system is that the closed-loop system has the ability to self-correct while the open-loop system doesn’t. Consequently, closed-loop systems are often called feedback control systems while open-loop systems are also known as non-feedback controls.

What is MIMO in LTE?

MIMO (Multiple-Input Multiple-Output) Essentially MIMO, employs multiple antennas on the receiver and transmitter to utilize the multi-path effects that always exist to transmit additional data, rather than causing interference. The schemes employed in LTE again vary slightly between the uplink and downlink.

What is Pucch used for?

PUCCH format 1 is used for transmission of HARQ ACK/NACK (i.e., a single-bit HARQ feedback corresponding to one downlink component carrier is used to generate one BPSK-modulated symbol, and in the case of downlink spatial multiplexing, 2 bits of HARQ feedback are used to generate one QPSK-modulated symbol) and for …

What is prach and Pusch?

The main 5G NR physical channels used for Uplink communication are the Physical uplink shared channel (PUSCH), the physical uplink control channel (PUCCH), and the Physical Random Access Channel (PRACH). Uplink signals such as DM-RS, PT-RS, and SRS are also supported.

What are the key requirements in applying power in LTE?

UE MAX POWER It cannot transmit more than its maximum UE power which is commonly 23 dBm for most LTE UEs in the Uplink. The objective of the eNOdeB is that UE should transmit only enough power in the uplink in a range which is the minimum required amount. Neither more, nor less than that.