Remote Monitoring System for Communication Base Based on Short Message

TELKOMNIKA Indonesian Journal of Electrical Engineering
Vol.12, No.1, January 2014, pp. 459 ~ 467
DOI: http://dx.doi.org/10.11591/telkomnika.v12i1.3200  459
Received May 15, 2013; Revised July 23, 2013; Accepted August 5, 2013
Remote Monitoring System for Communication Base
Based on Short Message
Xiaorong Zhao*a
, Feiyue Yeb
, Xiufang Qianc
, Hanyu Fud
, Wei Jine
College of Computer Engineering, Jiangsu University of Technology NO.1801, Zhong Wu Anenue,
Changzhou, China, Ph./Fax: +8613776816150/+86051986953241
*Corresponding author, e-mail: zhaoxr432698@gmail.com*
a
, yfy@jstu.edu.cn
b
, dqxf@jstu.edu.cn
c
,
feiyu79@jstu.edu.cn
4
, 240883564@qq.com
e
Abstract
The automatic monitoring system of communication base which is an important means to realize
modernization of mobile communication base station management. In this paper, we implement a
monitoring system for communication base with three essential functions which are telemetry, remote
control and communication. In this system, data acquisition unit, data transmit unit and monitoring centre
unit are combined to form this monitoring system. The system can check the communication base status
anytime through GSM SMS (short message service), and can send predefined command to perform
remote data collection and monitoring in the special conditions. It is suitable especially for the alarm of
unusual situation, the monitoring of environmental information and entrance guard information. The paper,
firstly, proposes the architecture of the monitoring system; secondly, proposes the terminal of monitoring
system. The data collection terminal is studied and designed, including hardware design based on
embedded system and software design. Finally, presents implmentation and results. The monitoring
system can improve the integrity, reliability, flexibility and intellectuality of monitoring system. The system
with modular structure, which is low-cost, fitter and easier to move and operate, can be expanded
according to practical need and is reliable and effective through field test.
Keywords: Short Message, AT Command, Communication Base, Monitoring System, GSM
Copyright © 2014 Institute of Advanced Engineering and Science. All rights reserved.
1. Introduction
Nowadays, with the rapidly development of mobile communication business, the
number of communication base is increasing day by day. The present monitoring methods
include wired method and artificial method. The wired method challenge by trouble connected
up, abominable working environment, information transmission in time, operation cost and so
on. it is not suitable for the plentiful and widespread medium-mini bases [1]. The artificial
method has two disadvantages: low efficiency of implementation and large consumption of
resources. In order to reduce the maintaining cost and guarantee the communication quality, the
operating information of communication bases and the information of entrance guard must be
watched in time.
In the paper, the monitoring system on communication bases is designed which is
based on Short Message. As the lower running cost and more steady function, SMS based on
GSM networks provide us a ideal platform to develop the mobile commerce. Monitoring center
and monitor terminal combined to the monitoring system, this system could run without artificial
intervention, once some base occur exception or fault, monitoring terminal would automatically
upload the exception information to monitoring center and maintenance man by SM (short
message). This paper presents the design and realization of data acquisition, communication
and monitoring system for communication base station.
2. Proposed Architecture of the Monitoring System
The system functions relying on mobile communication between computer and
microcontroller based on GSM technique. The system comprises a control center and
monitoring terminals. The control center consists of a server, a GSM module and a database
system and the terminal consists of microcontrollers, sensors, a MF RC500 module and a GSM

 ISSN: 2302-4046
TELKOMNIKA Vol. 12, No. 1, January 2014: 459 – 467
460
module in base station. The overall design of the monitoring system is shown as in Figure 1. We
focuses on the implement of monitoring terminal in following text.
Figure 1. Overall architecture of the monitoring system
3. Design of the Monitoring Terminal
The monitoring terminal consists of microcontrollers, sensors, the circuit of MF RC500
and a GSM module. Once the abnormal parameter data appear, processor will arrange the
abnormal message, initiate the data transmission and then send them out to control center [2].
Microcontroller module is W77E58, which is used as a master chip. The W77E58 is a fast 8051
compatible microcontroller with a redesigned processor core for no waste of clock and memory
cycles. As a result, the execution of 8051 instruction is faster than the original 8051 at the same
crystal speed. Typically, the instruction execution time of W77E58 is 1.5 to 3 times faster then
that of traditional 8051. Also, the W77E58 contains 32 KB Flash EPROM, two enhanced serial
ports and provides operation voltage from 4.5V to 5.5V [3].
Figure 2. The block diagram of monitoring terminal

TELKOMNIKA ISSN: 2302-4046 
Remote Monitoring System for Communication Base Based on Short Message (Xiaorong Zhao)
461
The value of parameters is measured in the system including air temperature, air
humidity and information of entrance guard etc. The sensors and MFRC500 are combined to
collect the real-time environment parameter data and hand over these data to microcontroller
processor for further handling and storage. The microcontroller determines whether the data are
normal or not. Once the abnormal parameter data appear, processor will arrange the abnormal
message, initiate the data transmission, and then send them out to control center. C51
language is adopted according to the features of data and C language for system development.
Software design mainly includes three parts: collecting and displaying temperature and humidity
of base stations, reading and decoding short messages, encoding and sending temperature and
humidity. The block diagram of the monitoring terminal is shown as in Figure 2.
3.1. Sensor Design
SHT10 is Sensirion’s family of surface mountable relative humidity and temperature
sensors. The sensor integrates sensor elements plus signals processing on a tiny foot and
provides a fully calibrated digital output. A unique capacitive sensor element is used for
measuring relative humidity while temperature is measured by a band-gap sensor. The sensor
is seamlessly coupled to a 14bit analog to digital converter and a serial interface circuit. This
results in superior signal quality, a fast response and insensitivity to external disturbances
(EMC). A unique capacitive sensor element is used for measuring relative humidity while
temperature is measured by a band-gap sensor [4]. It has output of standardized digital signal,
small size and low power consumption. This sensor can measure in the range of -40-123.8℃
and 0%-100% relative humidity. Under the conditions of 25℃ and 3.3V, the relative humidity
accuracy can reach ±4.5%R.H., while temperature accuracy is ±0.5℃.
In the paper the measurement resolution of is 14 bit for temperature and 12 bit for
humidity. Because of nonlinear relation between digital output and relative humidity (RH) for the
sensor SHT10, the data from SHT10 must be processed before being converted to actual
physical quantity. For compensating non-linearity of the humidity sensor, it is recommended to
convert the humidity readout (SORH) with the following formula [4]:
RHlinear=c1+c2*SORH+c3*SORH
2
(%RH) (1)
The values of humidity coefficients are given in Table 1:
Table 1. SHT10 humidity conversion coefficients
SQRH C1 C2 C3
12bit -4.000 0.0405 -2.8000E-6
In case of temperature, the following formula is used to convert digital readout (SOT) to
temperature value [4]:
T=d1+d2*SOT (2)
The values of temperature coefficients are given in Table 2:
Table 2. SHT10 temperature conversion coefficients
VDD SOT d1(℃) d2(℃)
5 14bit -40.1 0.01
Table 3. Temperature compensation coefficients
SQRH t1 t2
12bit 0.01 0.00008

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462
RH value is calculated at 25℃ in the formula (1), but actual test temperature is variable
in a certain range. Therefore the temperature coefficient is considered for the sensor SHT10
according to the following formula [4], namely, coefficients for the temperature compensation
are given in Table 3.
RHtrue=(T-25)*(t1+t2*SORH)+RHlinear (3)
The values of temperature compensation coefficients are given in table3. The flow
diagram of SHT10 software design is shown in Figure 3. Temperature and humidity are
calculated with the following programs:
Figure 3. Flow diagram of SHT10
3.2. Proposed Circuit of MFRC500
MFRC500 is a member of a new family with highly integrated reader ICs for contactless
communication on 13.56MHz which supports all protocol layers of the ISO 14443A [5]. The
paper gives a solution of design and implementation for RFID R/W device based on the key
character and internal structure of MF RC500 chip, the R/W operating to Mifare1 card is
processed by the control and communication between P89C51 and MF RC500. The aim is to
provide the required understanding of the MIFARE RF interface (ISO 14443A) to design
application specific antennas and matching circuits to achieve the best performance for a
communication with a contactless MIFARE card [6]. Receiving circuitry and EMC filter are as
shown in Figure 4 [7]. As well as antenna circuit shown in Figure 5 [8]. The flow diagram of read
card operation is shown in Figure 6.

463
Figure 4. MFRC500 Receiving circuitry and EMC filter
Figure 5. Design of antenna circuit
Figure 6. The flow diagram of read card

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3.3. Circuit of GSM Terminal
Sony Ericsson GR47 is selected which belong to a new generation of Sony Ericsson
Mobile Communication GSM/GPRS modules. The GR47 module provides Chinese language,
and provides four transmission modes including voice, data, short message, and FAX. The
module works in frequency bands EGSM 900/1800 MHz, power voltage 3.3-3.5V [9]. The
product can be used in machine-to-machine applications and man-to-machine applications
where there is a need to send and receive data (by SMS，CSD, HSCSD, or GPRS), and make
voice calls by the GSM network [9].
Microcontroller presents a pulse to the ON/OFF signal connection of GR47, which is
designed to exceed 0.5 seconds but less than 1.0 second [8]. When SM is prepared to be sent,
the microcontroller sends AT commands to the radio device via serial interface ports. The
digram of GR47 design is as shown in Figure 7. In order to reduce electrical current, R1 and
R2(R1=R2=3.6kΩ) are used. (R3=3.6kΩ, R4=12kΩ) [10].
Figure 7. The diagram of the GR47 and W77E58
At present, there are two usual modes: Text and PDU (Protocol Data Unit). It is easy
and simple to receive and send for Text mode, but Chinese short message cannot be received
and sent. However these can be realized for PDU mode which includes three codes: 7-bit, 8-bit
and UCS2. Among these codes, ordinary ASCII characters are sent for 7-bit code, data
information for 8-bit code, Unicode characters for UCS2 code. In this paper, PDU mode is
adopted, whose data frame structure is as in Table.4.
Table 4. PDU data package structure
SMSC PDU type MR DA DIP DCS VP UDL UD
In PDU data frame structure, SMSC field stands for short message center address; as
well as PDU type for data package type, MR data package for sent information, DA for
destination address, DIP for protocol identifier and DCS for short message code mode. Code of
digit or character is ‘00’, and code of Chinese is ‘08’ for Unicode adopted in this paper. VP
stands for valid time of short message as well as UDL for the length of data and UD for the
content of specific short message [11].

465
4. Implementation and Results
The realizations of proposed system functions rely on mobile communication between
computer and microcontroller based on GSM. The system comprises a control center composed
of a server, a GSM module and a database system, and monitoring terminal composed of
microcontrollers, sensors, a MF RC500 and a GSM module in the base station. The value of
parameters is measured at every base station, including air temperature, air humidity, the
information of entrance guard etc. The sensors and MFRC500 are combined to collect the real-
time environment parameter data and hand over these data to microcontroller processor for
handling and storage.The microcontroller determines whether the data are normal or not. Once
the abnormal parameter data appear, processor will arrange the abnormal message and initiate
the data transmission and send it out to control center. The flow diagram of the monitor terminal
is shown in Figure 8.
Figure 8. Flow diagram of monitor terminal software
5. Conclusion
This paper proposes a remote monitoring system base on SM. The most significant
features of the system are applications of RF and GSM technology. The results show that it can
meet the basic requirements of sensor accuracy, communication and so on. In addition, the
system has good extensibility and compatibility. The operation and implementation cost of the
system has been reduced by the use of SMS. Besides, it is easy to install and upgrade. For
example, when the number of monitoring information increases, the communication mode of
system can be designed based on GPRS. Because the GR47 module can support GRPS, the
hardware of system does not need to change. There are wide application prospects because of
limitlessness of terrain and being suitable for remote monitor.

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466
Acknowledgment
This work was financially supported by National Natural Science Foundation (No.
61142007) and the Key Laboratory of Cloud Computing & Intelligent Information Processing of
Changzhou City under Grant No.CM20123004. The supports are gratefully acknowledged.
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