What is physical layer in LTE?
What is physical layer in LTE?
LTE Physical layer eNodeB Transmitter eNodeB Physical layer consists of Channel coding,rate matching, scrambler, mapper, layer mapping, pre-coding, resource element mapper, ofdm module. CRC is appended to the data from MAC layer before being passed through the PHY layer.
What are the LTE physical layer design requirements?
The design of the LTE physical layer (PHY) is heavily influenced by requirements for high peak transmission rate (100 Mbps DL/50 Mbps UL), spectral efficiency, and multiple channel bandwidths (1.25-20 MHz).
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.
What is LTE RB?
A resource block (RB ) is the smallest unit of resources that can be allocated to a user. The resource block is 180 kHz. wide in frequency and 1 slot long in time.
What is one of the main features of the LTE physical layer?
LTE physical layer modulation. Adaptive modulation and coding, support of MIMO systems and HARQ are the key features of the LTE downlink.
In which series of the 3gpp specifications is the LTE physical layer found?
TS 36.201
3GPP Specification series
| spec number | title |
|---|---|
| TS 36.201 | Evolved Universal Terrestrial Radio Access (E-UTRA); LTE physical layer; General description |
| TS 36.211 | Evolved Universal Terrestrial Radio Access (E-UTRA); Physical channels and modulation |
What is MCS in LTE?
MCS (Modulation and Coding Scheme) defines how many useful bits can be transmitted per Resource Element (RE). MCS depends on radio link quality. The better quality the higher MCS and the more useful data can be transmitted.
What is difference between PRB and RB in LTE?
Hence from the quoted information its clear that the dimensions of RB & PRB are the same in LTE. although both are different logically. RB is a virtual concept assigned by MAC while PRB is the actual physical resource allocated to the user.
What is MAC layer in LTE?
The MAC layer is composed of a Hybrid Automatic Repeat request (HARQ) entity, a multiplexing/de-multiplexing entity, a logical channel prioritization entity, and a control entity.
What are logical transport and physical channels?
Physical channels: These are transmission channels that carry user data and control messages. Logical channels: Provide services for the Medium Access Control (MAC) layer within the LTE protocol structure.
What SDF means?
SDF(service data flow) are used to map packets to the TFT(traffic flow template) based on 5 tuples and TFT is responsible for maping packet to the respective bearer which matches the QOS of bearer and the packet.
