Mobile Handset Cellular Network

فهرست عناوین اصلی در این پاورپوینت

فهرست عناوین اصلی در این پاورپوینت

● Mobile Handset Cellular Network
● Cellular Network Basics
● Cellular Network
● Cellular Network Generations
● Evolution of Cellular Networks
● The Multiple Access Problem
● Multiple Access Schemes
● Frequency Division Multiple Access
● Time Division Multiple Access
● Code Division Multiple Access
● 2G(GSM)
● GSM Services
● GSM Channels
● GSM Frequencies
● GSM Architecture
● Mobile Station (MS)
● Subscriber Identity Module
● Base Station Subsystem
● Network and Switching Subsystem
● Home Location Register
● Other Systems
● Location Updates
● Handoff (Handover)
● Roaming
● 3G, 3.5G and 4G (LTE)
● 3G Overview
● Evolution from 2G
● Service Roadmap
● GSM Evolution to 3G
● UMTS Frequency Spectrum
● UMTS Architecture
● UMTS Network Architecture
● 3.5G (HSPA)
● 4G (LTE)
● Advantages of LTE
● Comparison of LTE Speed
● Major LTE Radio Technogies
● LTE Architecture
● Case Study
A Double-Edged Sword
for HSPA Networks
● Context
● Outline
● Measurement Routes
● Measurement Route
● Measurement Setup
● General Impact of Mobility
● Context
● Bandwidth Sharing among Users
● Context
● Bandwidth Sharing among Traffic Flows
● Context
● Mobility Impact in Transitional Regions
● Conclusion
● Acknowledgement

نوع زبان: انگلیسی حجم: 3.41 مگا بایت
نوع فایل: اسلاید پاورپوینت تعداد اسلایدها: 64 صفحه
سطح مطلب: نامشخص پسوند فایل: ppt
گروه موضوعی: زمان استخراج مطلب: 2019/06/05 11:06:06

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عبارات مهم استفاده شده در این مطلب

عبارات مهم استفاده شده در این مطلب

mobile, frequency, station, cellular, mhz, base, subscriber, code, network, access, channel, multiple,

توجه: این مطلب در تاریخ 2019/06/05 11:06:06 به صورت خودکار از فضای وب آشکار توسط موتور جستجوی پاورپوینت جمع آوری شده است و در صورت اعلام عدم رضایت تهیه کننده ی آن، طبق قوانین سایت از روی وب گاه حذف خواهد شد. این مطلب از وب سایت زیر استخراج شده است و مسئولیت انتشار آن با منبع اصلی است.

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عبارات پرتکرار و مهم در این اسلاید عبارتند از: mobile, frequency, station, cellular, mhz, base, subscriber, code, network, access, channel, multiple,

مشاهده محتوای متنیِ این اسلاید ppt

مشاهده محتوای متنیِ این اسلاید ppt

mobile handset cellular network cellular network basics there are many types of cellular services before delving into details focus on basics helps navigate the acronym soup cellular network telephony is a radio based technology radio waves are electromagnetic waves that antennas propagate most signals are in the ۸۵ mhz ۹ mhz ۱۸ mhz and ۱۹ mhz frequency bands cell phones operate in this frequency range note the logarithmic scale cellular network base stations transmit to and receive from mobiles at the assigned spectrum multiple base stations use the same spectrum spectral reuse the service area of each base station is called a cell each mobile terminal is typically served by the ‘closest’ base stations handoff when terminals move cellular network generations it is useful to think of cellular network telephony in terms of generations g briefcase size mobile radio telephones ۱g analog cellular telephony ۲g digital cellular telephony ۳g high speed digital cellular telephony including video telephony ۴g ip based anytime anywhere voice data and multimedia telephony at faster data rates than ۳g to be deployed in ۲ ۱۲–۲ ۱۵ evolution of cellular networks ۱g ۲g ۳g ۴g ۲.۵g the multiple access problem the base stations need to serve many mobile terminals at the same time both downlink and uplink all mobiles in the cell need to transmit to the base station interference among different senders and receivers so we need multiple access scheme multiple access schemes frequency division multiple access fdma time division multiple access tdma code division multiple access cdma ۳ orthogonal schemes frequency division multiple access each mobile is assigned a separate frequency channel for the duration of the call sufficient guard band is required to prevent adjacent channel interference usually mobile terminals will have one downlink frequency band and one uplink frequency band different cellular network protocols use different frequencies frequency is a precious and scare resource. we are running out of it cognitive radio frequency time division multiple access time is divided into slots and only one mobile terminal transmits during each slot like during the lecture only one can talk but others may take the floor in turn each user is given a specific slot. no competition in cellular network unlike carrier sensing multiple access csma in wifi guard time – signal transmitted by mobile terminals at different locations do no arrive at the base station at the same time code division multiple access use of orthogonal codes to separate different transmissions each symbol of bit is transmitted as a larger number of bits using the user specific code – spreading bandwidth occupied by the signal is much larger than the information transmission rate but all users use the same frequency band together orthogonal among users ۲g gsm gsm abbreviation for global system for mobile communications concurrent development in usa and europe in the ۱۹۸ ’s the european system was called gsm and deployed in the early ۱۹۹ ’s gsm services voice ۳.۱ khz short message service sms ۱۹۸۵ gsm standard that allows messages of at most ۱۶ chars. incl. spaces to be sent between handsets and other stations over ۲.۴ billion people use it multi billion industry general packet radio service gprs gsm upgrade that provides ip based packet data transmission up to ۱۱۴ kbps users can simultaneously make calls and send data gprs provides always on internet access and the multimedia messaging service mms whereby users can send rich text audio video messages to each other performance degrades as number of users increase gprs is an example of ۲.۵g telephony – ۲g service similar to ۳g gsm channels physical channel each timeslot on a carrier is referred to as a physical channel logical channel variety of information is transmitted between the ms and bts. different types of logical channels traffic channel control channel downlink uplink channels gsm frequencies originally designed on ۹ mhz range now also available on ۸ mhz ۱۸ mhz and ۱۹ mhz ranges. separate uplink and downlink frequencies one example channel on the ۱۸ mhz frequency band where rf carriers are space every ۲ mhz ۱۷۱ mhz ۱۸۸ mhz ۱۸ ۵ mhz ۱۷۸۵ mhz uplink frequencies downlink frequencies uplink and downlink frequency separated by ۹۵mhz gsm architecture mobile station ms ms is the user’s handset and has two parts mobile equipment radio equipment user interface processing capability and memory required for various tasks call signalling encryption sms equipment imei number subscriber identity module subscriber identity module a small smart card encryption codes needed to identify the subscriber subscriber imsi number subscriber’s own information telephone directory third party applications banking etc. can also be used in other systems besides gsm e.g. some wlan access points accept sim based user authentication base station subsystem transcoding rate and adaptation unit trau performs coding between the ۶۴kbps pcm coding used in the backbone network and the ۱۳ kbps coding used for the mobile station ms base station controller bsc controls the channel time slot allocation implemented by the btses manages the handovers within bss area knows which mobile stations are within the cell and informs the msc vlr about this base transceiver system bts controls several transmitters each transmitter has ۸ time slots some used for signaling on a specific frequency network and switching subsystem the backbone of a gsm network is a telephone network with additional cellular network capabilities mobile switching center msc an typical telephony exchange isdn exchange which supports mobile communications visitor location register vlr a database part of the msc contains the location of the active mobile stations gateway mobile switching center gmsc links the system to pstn and other operators home location register hlr contain subscriber information including authentication information in authentication center auc equipment identity register eir international mobile station equipment identity imei codes for e.g. blacklisting stolen phones home location register one database per operator contains all the permanent subscriber information msisdn mobile subscriber isdn number is the telephone number of the subscriber international mobile subscriber identity imsi is a ۱۵ digit code used to identify the subscriber it incorporates a country code and operator code imsi code is used to link the msisdn number to the subscriber’s sim subscriber identity module charging information services available to the customer also the subscriber’s present location area code which refers to …

کلمات کلیدی پرکاربرد در این اسلاید پاورپوینت: mobile, frequency, station, cellular, mhz, base, subscriber, code, network, access, channel, multiple,

این فایل پاورپوینت شامل 64 اسلاید و به زبان انگلیسی و حجم آن 3.41 مگا بایت است. نوع قالب فایل ppt بوده که با این لینک قابل دانلود است. این مطلب برگرفته از سایت زیر است و مسئولیت انتشار آن با منبع اصلی می باشد که در تاریخ 2019/06/05 11:06:06 استخراج شده است.

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