基于NB-IoT协议的加解扰设计

Scrambling Design Based on NB-IoT Protocol

本文提出一种快速且可以在耗费资源少的情况下生成的解扰序列,并提出NB-IoT协议公共数据信道的加扰/解扰的设计方法。本设计方法采用预先自生成的表格、RNTI值以及小区参数(物理层小区ID号、无线帧号SFN、时隙号Ns等),快速生成NC比特后的短序列状态,再以此短序列为初始态,按序列生成公式、生成所需要的伪随机序列,最后实现对公共数据信道的加扰/解扰功能,从而避免整个扰码序列前NC个比特的生成耗时。改进后,本发明对正常的加解扰功能没有影响,但整个伪随机序列生成总耗时至少降低了一半。对现有的软硬件模块没有冲突,不需要重新设计,成本较少。

In this paper,we propose a fast and efficient descramble sequence generated in the case of less resource consumption,and propose a design method of scrambling/descramping for the common data channel of the NB-Io T protocol. The design method uses the pre generated form,RNTI value and cell parameters（physical layer ID number,wireless frame number SFN,time slot number Ns,etc.）to quickly generate the short sequence state after NC bit,and then take the short sequence as the initial state,and generate the required pseudo random sequence according to the sequence generation formula,and finally,the scrambling/descrambling function of the common data channel is realized,so as to avoid the time consuming of generating NC bits before the scrambling sequence. After improvement,the invention has no influence on the normal scrambling and scrambling function,but the total pseudo random sequence generation time is reduced by at least half. There is no conflict between the existing hardware and software modules,no redesign and less cost.