What is the LTE physical layer?

Table of Contents

This paper focuses on the LTE physical layer (PHY). The LTE PHY is a highly efficient means of conveying both data and control information between an enhanced base station (eNodeB) and mobile user equipment (UE). The LTE PHY employs some advanced technologies that are new to cellular applications.

What are LTE protocols & specifications?

Air Interface Physical Layer.
GPRS Tunnelling Protocol User Plane (GTP-U)
GTP-U Transport.
Medium Access Control (MAC)
Non-Access-Stratum (NAS) Protocol.
Packet Data Convergence Protocol (PDCP)
Radio Link Control (RLC)
Radio Resource Control (RRC)

Why are there 12 subcarriers in LTE?

In the downlink, the subcarriers are split into resource blocks. This enables the system to be able to compartmentalise the data across standard numbers of subcarriers. Resource blocks comprise 12 subcarriers, regardless of the overall LTE signal bandwidth. They also cover one slot in the time frame.

How is Rsrp measured?

In other words RSRP (Reference Signal Receive Power) is the average power of Resource Elements (RE) that carry cell specific Reference Signals (RS) over the entire bandwidth, so RSRP is only measured in the symbols carrying RS. RSRP is the average received power of a single RS resource element.

How is LTE signal transmitted?

LTE transmits data by dividing it into slower parallel paths that modulate multiple subcarriers in the assigned channel. The data is transmitted in segments of one symbol per segment over each subcarrier. Data to be transmitted is allocated to one or more resource blocks (RBs).

How do you read LTE signal strength?

How to read your Android cell signal?

Tap Settings.
Tap About Phone.
Tap Status or Network.
Tap SIM Status.
Your dBm is under Signal strength.

How is Sinr measured in LTE?

RSRP is measured on a LTE single sub-carrier i.e. 15KHz and similary SNR can also be measured per sub-carrier (Narrow Band SNR) or over a certain number of sub-carriers (Wide band SNR). UE normally has a noise figure of 7 dB then then Rx sensitivity for one sub-carrier will be -125.23 dBm (-132.23 +7).

What makes up the physical layer of LTE?

The design of the LTE physical layer (PHY) is heavily influenced by the requirements for high peak transmission rate (100 Mbps DL/50 Mbps UL), spectral efficiency, and multiple channel bandwidths (1.25-20 MHz). To fulfill these requirements, orthogonal frequency division multiplex (OFDM) was selected as the basis for the PHY layer.

Which is better 3G or LTE in your area?

While 3G can be faster than LTE in rare circumstances, the norm is that LTE is much faster. There is also 3G HSPA+, which is faster than its 3G cousin. It could be that 3G performs better than LTE in your area for now.

How are resource blocks measured in LTE layer?

Frequency measures Bandwidth Resource Blocks Subcarriers (downlink) Subcarriers (uplink) 1.4 MHz 6 73 72 3 MHz 15 181 180 5 MHz 25 301 300 10 MHz 50 601 600

Which is better 4G or Long Term Evolution?

LTE is short for “long term evolution”. It’s derived from the journey of mobile connectivity. LTE is the pinnacle of many years of development. It’s often compared to 4G. But the standards for 4G are actually higher than LTE’s current capabilities.