How is data sent in LTE?

After the device’s radio context has been restablished, the cellular tower notifies the MME, which in turn notifies the S-GW, which is now able to route the message to the correct radio tower. Finally, the tower sends the data to the device through the device’s LTE modem interface .

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What is rate matching in 5G?

The rate-matching is to extract the exact set of bits to be transmitted within a given TTI . The rate-matching for Turbo coded transport channels is defined for each code block: there are three basic steps composing a rate-matching. Namely, sub-block interleaver, bit collection, and bit selection.

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What is code block in LTE?

for code block segmentation used on LTE-Advanced channel coding physical layer (PHY) is presented in this paper. Code block segmentation is a generic procedure which is commonly applied before turbo encoding . Its main function is to fragment a large transport block into smaller code blocks.

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What is CRC attachment?

Transport Block CRC Attachment A cyclic redundancy check (CRC) is used for error detection in transport blocks . The entire transport block is used to calculate the CRC parity bits. The transport block is divided by a cyclic generator polynomial, described as g C R C 24 A in section 5.1.

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What is the PRB in LTE?

Abstract: In LTE (Long Term Evolution) systems, the PRB (Physical Resource Block ) usage ratio is considered importantly to manage the QoS (Quality of Service) of LTE traffic. As the PRB usage ratio increases, the resource may not be allocated in a timely and reliable manner to the users of the cell.

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How does LTE calculate PRB?

Physical Resource Block (PRB) = 2*Resource Block = 12 Subcarriers x 14 OFDM in 1ms . RE can deliver 2, 4, 6, 8 bits in QPSK, 16QAM, 64QAM, 256QAM respectively. If we calculate for 64QAM as 6bits since 256QAM not widely spread (check Samsung S7 in T-Mobile). 20MHz ==> 100 PRB ==> 100*168*1000 = 16,800,000 RE in 1 s.

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