What is Ng factor in LTE?
What is Ng factor in LTE?
Allocation (Ng) is a higher layer parameter configured from the set {1/6, 1/2, 1, 2} that determines the number of PHICH groups per subframe. The number of PHICH groups in a subframe is given by the equation for NgroupPHICH in Section 6.9 of 3GPP TS 36.211.
What is LTE resource grid?
The subframe resource grid is represented in the LTE Toolbox as a multidimensional array of the following size. Therefore, the resource grid represents a subframe (two slots) and whole bandwidth, since there are 12 subcarriers per resource block.
Which channel indicates the number of symbols used by the Pdcch Phich Pdcch Pbch Pcfich?
Explanation: PCFIH channel indicates the number of symbols used by the PDCCH. The actual number of OFDM symbols occupied in any given subframe is indicated in the PCFICH (Physical Control Format Indicator Channel), which is located in the first OFDM symbol of each subframe. 6.
What is the Phich in LTE?
PHICH is a control channel on LTE downlink, that is used to indicate the reception of PUSCH transmission from a mobile/UE. The PHICH indicates either a ACK or a NACK, which the UE will decode to find out if it has to do a retransmission or not.
How is LTE throughput calculated?
If modulation used is 64 QAM (6 bits per symbol) then throughput will be 16.8×6=100.8Mbps for a single antenna port. If we consider a 2×2 MIMO system then this throughput will be double i.e. 100.8×2= 201.6 Mbps and with 4×4 MIMO system then throughput is about 100.8×4= 403.2 Mbps.
What is CCE in 5G?
Control Channel Element(CCE): A CCE is a combination of multiple REGs. The number REG bundles within a CCE varies. Aggregation Level: Aggregation Level indicates the number of CCEs allocated for a PDCCH.
What is Harq in 5G?
5G NR (New radio) has several retransmission systems using three different layers in the protocol stack: MAC protocol: It implements a fast retransmission system with delay less than 1ms in new radio, called HARQ (Hybrid Automatic Repeat reQuest).
How many frames is LTE?
In LTE, DL and UL transmissions are organized into radio frames of 10 ms each. Each frame is divided into ten equally sized subframes.
What does phich stand for in LTE quick reference?
LTE Quick Reference Go Back To Index Home : www.sharetechnote.com. PHICH/PHICH Group. PHICH stands for Physical channel HybridARQ Indicator Channel. Simply put, it is a secially designed downlink only channel which carries ACK or NACK for the PUSCH received by the network.
Where does the ng value come from in N group phich?
You would see that to calculate the N_group_PHICH you should know Ng value and the specification says the Ng value comes from higher layer. In this case, the higher layers means “MIB (Master Information Block)”. MIB has an IE(information element) called “phich-Resource” as shown below.
How is the number of phich groups determined?
The number of PHICH groups is a cell level parameter and it is also transmitted as part of MIB, so as to assist the UE in getting the control channel mapping. The PHICH group value/Ng is decided based on how much users per subframe would the system want to support in Uplink PUSCH.
What does phich / phich group phich stand for?
PHICH/PHICH Group PHICH stands for Physical channel HybridARQ Indicator Channel. Simply put, it is a secially designed downlink only channel which carries ACK or NACK for the PUSCH received by the network. Uplink case they just used PUCCH for carrying ACK/NACK for each PDSCH it recieved.