The difference lies in the length of CP.Īs I mentioned in other page, in terms of physical layer implementation LTE-NB is pretty new radio technology comparing to legacy LTE. As you see in the following illustration, the length of Sequence part of Preamble format 0 and 1 are same. All of the 5 subblock is made up of identical symbols. The Sequence part is made up of 5 sub blocks.
Each preamble format is made up of two portions : CP and Sequence.
In LTE NB, there are only two Preamble formats. I will put further description some time later when I have time. Technically the RACH procedure is from Step (B) through (H), but I added some additional steps that must be done before and after the RACH procedure. Overall Process of RACH procedure for initial attachįollowing is the overall procedure for RACH Process for Initial Attach.
Time and Frequency Domain Resource Allocation. Overall Process of RACH procedure for initial attach. The most of this complication seems to come from physica resource allocation of Preamble signal in LTE NB (You would see a whole bunch of parameters in NPRACH-Parameters-NB-r13, most of which would not be seen in legacy LTE and LTE BL/CE(M1)) .įollowings are the topics that will be covered in this page. If you compare the LTE BL/CE(M1) RACH and LTE NB(M2) RACH procedure, you would notice that LTE NB(M2) RACH is more complicated. If you compare the legacy LTE and LTE BL/CE(M1) RACH procedure, LTE BL/CE is more complicated and the most of those complication comes from repeated transmission of each message. However, you would have noticed this procedure got more and more complicated if you look one step deeper into it. That is, they are all go through the 4 step message transaction (Msg1, Msg2, Msg3, Msg4). If you look at the high level procedure of RACH, LTE-NB RACH is not much different from legacy LTE or LTE BL/CE(M1).
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