scholarly journals A Packet Delay Assessment Model in the Data Link Layer of the LTE

2021 ◽  
Vol 5 (4) ◽  
pp. 402
Author(s):  
Ulugbek Amirsaidov ◽  
Azamat Qodirov
Keyword(s):  
Service Time ◽  
Generating Functions ◽  
Coefficient Of Variation ◽  
Delay Time ◽  
Packet Delay ◽  
Physical Layer ◽  
Assessment Model ◽  
Data Link ◽  
Link Layer ◽  
Data Link Layer

The issues of modeling and evaluating the characteristics of the LTE data link layer functioning are considered. Transmitting packets in the data link layer are represented by a probabilistic-temporal graph consisting of two subgraphs. The first subgraph describes the operation of the HARQ protocol, and the second subgraph describes the operation of the ARQ protocol. The first subgraph is nested within the second subgraph. The probabilities of correct reception, non-error detection, and retransmission of packets in the MAC and RLC layers and generating functions of the packet service time based on the HARQ and ARQ protocols are determined. With the help of generating functions, the average value, variance, and coefficient of variation of the packet service time are determined. To calculate the average packet delay time in the LTE data link layer, the type of queuing system is selected, taking into account the coefficient of variation of the packet service time. The analysis of packets' delay time in the network's data link layer is carried out for different values of the intensity of packet arrival and the probabilities of a bit error in the physical layer of the network. For the sustainable functioning of the data link layer of the network, the limit values of the intensity of the arrival of packets are determined for a given probability of a bit error in the physical layer of the network.

The Research of HART Sensor System Based on ARM

2014 ◽  
Vol 602-605 ◽  
pp. 2855-2858 ◽  
Author(s):  
Dan Li
Keyword(s):  
Communication System ◽  
Design Method ◽  
Physical Layer ◽  
Application Layer ◽  
Data Link ◽  
Link Layer ◽  
Usb Interface ◽  
Modulation And Demodulation ◽  
Data Link Layer ◽  
Embedded Controller

This paper discusses the design method of economical and practical HART protocol communication system, and describes the research scheme in detail, according to the hierarchy of the system protocols: the physical layer, data link layer and application layer. This scheme includes the design of ARM embedded controller module, modulation and demodulation module and USB interface module and other components. According to the effect of the final product used in the field bus network, it is proved that the operation is stable, accurate, simple and easy.

scholarly journals A Data Concealing Technique with Random Noise Disturbance and a Restoring Technique for the Concealed Data by Stochastic Process Estimation

2020 ◽  
pp. 103-124
Author(s):  
Tomohiro Fujii ◽  
Masao Hirokawa
Keyword(s):  
Stochastic Process ◽  
Random Noise ◽  
Physical Layer ◽  
Data Link ◽  
Link Layer ◽  
Noise Disturbance ◽  
Data Link Layer

Abstract We propose a technique to conceal data on a physical layer by disturbing them with some random noises, and moreover, a technique to restore the concealed data to the original ones by using the stochastic process estimation. Our concealing-restoring system manages the data on the physical layer from the data link layer. In addition to these proposals, we show the simulation result and some applications of our concealing-restoring technique.

Joint Physical Layer and Data Link Layer Optimization of CDMA-Based Networks

2011 ◽  
Vol 10 (10) ◽  
pp. 3278-3287 ◽  
Author(s):  
A. Shojaeifard ◽  
F. Zarringhalam ◽  
M. Shikh-Bahaei
Keyword(s):  
Physical Layer ◽  
Data Link ◽  
Link Layer ◽  
Data Link Layer
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