What is CRC attachment?

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 .

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.

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.

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.

The output of a coding chain is a codeword. 5G supports transmission of up to 8 layers to a single user on the downlink. This means that there can be up to eight streams transmitted in parallel.