Contents
What is CFI in LTE?
In LTE, the Control Format Indicator (CFI) value defines the time span, in OFDM symbols, of the Physical Downlink Control Channel (PDCCH) transmission (the control region) for a particular downlink subframe. The CFI is transmitted using the Physical Control Format Indicator Channel (PCFICH).
What is CFI format?
CFI is a indicator telling how many OFDM symbols are used for carrying control channel (e.g, PDCCH and PHICH) at each subframe. If CFI is set to be 1 for a subframe, it means one symbol (the first symbol) at the subframe is used for PDCCH allocation.
What is Pcfich LTE?
The Physical Control Format Indicator Channel(PCFICH) is one among the downlink physical control channel and it carries the number of OFDM symbols used by the PDCCH channel, denoted as Control Format Indicator(CFI). These control channels play a key role in the correct decoding of the payload information.
What is C Rnti in LTE?
Cell Radio Network Temporary Identifier, The C-RNTI is a UE identifier allocated by a controlling RNC and it is unique within one cell controlled by the allocating CRNC. C-RNTI can be reallocated when a UE accesses a new cell with the cell update procedure.
What is a CFI discount?
Discounts. Educational discount: ● A discount offered to an institution due to its educational status. Normal discount: ● A discount a supplier would normally apply to anybody.
How do I open a CFI file?
You need a suitable software like CleverForm from Code Development Ltd. to open a CFI file. Without proper software you will receive a Windows message “How do you want to open this file?” or “Windows cannot open this file” or a similar Mac/iPhone/Android alert.
Why is there no Phich in 5G?
5G NBIOT LTE Question Answers PHICH channel is used in LTE to handle uplink re-transmissions and are tightly coupled to use of synchronous hybrid-ARQ protocol, but as the HARQ protocol is asynchronous in NR in both downlink as well as uplink. Hence the PHICH is not required in NR.
What is LTE frame structure?
In LTE, DL and UL transmissions are organized into radio frames of 10 ms each. Each frame is divided into ten equally sized subframes. The duration of each subframe is 1 ms. Moreover, each subframe is further divided into two equally sized time slots, that is, each slot is 0.5 ms.
How many types of Rnti LTE are there?
There are three types of TPC-RNTI namely TPC-PUSCH-RNTI, TPC-PUCCH-RNTI and TPC-SRS-RNTI.
What is LTE Rach procedure?
Two types of RACH process : Contention-based and Contention-free. When a UE transmit a PRACH Preamble, it transmits with a specific pattern and this specific pattern is called a “Signature”. In each LTE cell, total 64 preamble signatures are available and UE select randomly one of these signatures.
What is Harq in 5G?
In 5G NR, 3GPP specification has defined HARQ Codebook to provide the feedback to base station for Downlink data transmission i.e., PDSCH Data. Multiple HARQ process (upto 16) is supported per UE and there has to be separate feedback for each HARQ Process.
What does CFI mean in LTE quick reference?
LTE Quick Reference CFI is a indicator telling how many OFDM symbols are used for carrying control channel (e.g, PDCCH and PHICH) at each subframe. If CFI is set to be 1 for a subframe, it means one symbol (the first symbol) at the subframe is used for PDCCH allocation.
Can a CFI be set to 1 in a narrow bandwidth?
If you set CFI to 1 in a very narrow bandwidth you may break this rule. For the number of CCE required for number of PDCCH, refer to 36.213 Table 9.1.1-1. If you want to get more detailed explanation on CCE, PDCCH related issues, refer to following pages.
What does CFI mean for phich and pdcch?
CFI is a indicator telling how many OFDM symbols are used for carrying control channel (e.g, PDCCH and PHICH) at each subframe. If CFI is set to be 1 for a subframe, it means one symbol (the first symbol) at the subframe is used for PDCCH allocation.
How is code rate related to data rate?
Simply put, the code rate can be defined as the ratio of the data rate that is allocated for a subframe and the maximum data rate that ideally can be allocated in the subframe. A lower code rate means that more redundency bits are inserted during the channel coding process and a higher code rate means that less redundency bits are insterted.