Mapping between logical channels and transport channels. Universal mobile telecommunications system umts 1,2 is a thirdgeneration cellular network at the dawn of. Mapping of logical channels on transport channels 2. The physical channels are determined by the timeslot, whereas the logical channels are determined by the information carried within the physical channel. This page on gsm tutorial covers gsm logical channels and their functions. Based on, as mentioned earlier, whether they carry gsm traffic ie, speech or data or gsm. Logical channels define what type of information is being transferred and transport channel defines how the information is being transferred logical channels. Gsm logical channels telecommunications engineering.
Gprs general packet radio service a packet oriented data service for ip and x. The contents of the present document are subject to continuing work within the. Lte logical channels structure and mapping between logical channels and transport channels. What is umts universal mobile telecommunications service. In summary, a physical radio channel is the frequency or frequency pair allocated by the regulatory body. Mapping of logical channels onto transport channels. In case of dispute, the reference shall be the printing on etsi printers of the pdf version kept on a specific network drive within etsi secretariat.
Developed and maintained by the 3gpp 3rd generation partnership project, umts is a component of the international telecommunications union imt2000 standard set and compares with the cdma2000 standard set for networks based on the competing cdmaone. Intel atom processors are too weak to support the current implementation. One topic that often causes confusion in digital radio networks is the difference between physical and logical channels. Jan 11, 20 lte logical channels structure and mapping between logical channels and transport channels.
Anthony lo, geert heijenk and cezar bruma ericsson eurolab netherlands university of twente p o box 645, 7500 ap enschede p o box 217, 7500 ae enschede. Logical channels in gsm are defined by the type of information that is carried over them. How channel mapping in wcdma broadcast control channel dtch dedicated traffic channel rach random access channel fach forward access channel dsch downlink shared channel dcch dedicated control channel cpch common packet channel ctch common traffic channel dch dedicated transport channel pcch paging control channel pch paging channel ccch common control channel. Downlink channels channel mapping logical channels pcch mcch mtch ccch dcch dtch fcch bcch bcch sch cbch agch sdcch facch sacch tchf tchh ctch pch bch dlsch dch transport mch channels fach dsch gsm only umts only lte only gsm, umts, lte. Jan 14, 2011 however, please note that the description made above of the basic channels at the bottom of the tree ie, fundamental logical channels like tchf, facch, rach etc, remains the same. The information flows between the different protocols are known as channels and signals.
Fdma parts involves the division by frequency of the 25 mhz bandwidth in to 124 carrier frequencies also called arfcn spaced 200 khz for gsm900. Technical overview of 3gpp lte indian institute of. Logical channels physical channels are all the available time slots of a bts a bts with 6 carriers has 48 physical channels logical channels are piggybacked on the physical channels logical channels are laid over the grid of physical channels each logical channel performs a specific task. Umts terrestrial radio access network utran umts terrestrial radio access utra. The following picture depicts the logical channel hierarchy. Logical channels define what type of information is being transferred and transport channel defines how the information is being transferred. Like any form of wireless data link, the data needs to be managed to enable the system to handle it efficiently and effectively. Aug 03, 2017 mapping of these channels is shown in below pictures. May 20, 2015 all these kinds of messages are classified in logical channels. Umts logical channels and transport channels 3glteinfo. Umts universal mobile telecommunications service is a thirdgeneration broadband, packetbased transmission of text, digitized voice, video, and multimedia at data rates up to 2 megabits per second. Different bursts are mapped to these channels uniquely as per gsm technical specification 05. There are broadly two categories of logical channels available. The logical channels carry user information and control signalling data.
Fdd mode fdd mode channels there are three types of. There are three types of channels defined in wcdma. This paper proposes the utilization of gsm logical channels rach, agch and tch and umts signaling mib and sibs of the broadcast channel to transmit a cognitive beacon channel cbc. Logical channels can be broadly divided into two types. Logical files that contain more than one format are referred to as multiformat logical files. The number of logical channels that is needed is decided upon when the. In workspaces folder you have to open investigation wcdma gsm. The umts channels are communication channels used by third generation 3g wireless universal mobile telecommunications system umts networks. Enhanced uplink dedicated channel edch high speed uplink. The create logical file crtlf command creates a logical file from the information specified on this command and from the data description specifications dds contained in a source file. Objectives are higher data rates, lower latency on the user plane and control plane and a packetoptimized radio access technology.
My documents\tems product files \tems investigation 9. Openbts umts is a more computationally intensive application than openbts, since the umts channel bandwidth is roughly x larger than a gsm channel. The lcp is a method for multiplexing data of the plurality of rbs i. Cellular network organization use multiple lowpower transmitters 100 w or less areas divided into cells oeach served by its own antenna oserved by base station consisting of transmitter, receiver, and control unit oband of frequencies allocated ocells set up such that antennas of all neighbors are equidistant hexagonal pattern. Jaeho, lee distribution englished01 customer training center 2. The signalling channels are used for maintenance of the call and for enabling call set up, providing facilities such as handover when the call is in progress, and finally terminating the call. Transport formats in umts radio network controllers software implementation degree programme communications engineering laboratory communications laboratory s72 supervisor docent timo o. Eng abstract radio resource management rrm is an essential topic when 3g wcdma networks are being developed. Ubc, canada research engineer nokia research center, helsinki, finland.
In gsm, these channels are separated into physical channels and logical channels. That why, a logical channel determines the kind of information it uses. To manage the data carried, the 3g umts radio interface uses a series of data channels which can be categorised as logical, physical or transport channels. Consists of many logical network elements similar to the 2g systems. Umts offers a consistent set of services to mobile computer and phone users, no matter where they are located in the world. Logical channels define what type of information is transferred. A physical radio channel is a radio frequency or pair of frequencies that is allocated by the regulatory body to an agency for communication. Dedicated logical channels are allocated to a speci. Structure introduction we discuss the logical channels that are used in gsm system. Comprehensive coverage of umts 3g news, licensing, business developments, 3g wcdma telecommunication technology, multi media mobile phones and future communications. Mar 25, 2016 the second channel is sch channel which full form is synchronous channel in downlink logical channel in gsm. Lte is also referred to as eutra evolved umts terrestrial radio access or eutran evolved umts. File systems 14 directories directories serve two purposes for users, they provide a structured way to organize files for the file system, they provide a convenient naming interface that allows the implementation to separate logical file organization from physical file placement on the disk.
The forward channel is the direction of the communication or mobiletocell downlink path. New 3g logical channels and physical channel due to mbms 2. As shown in the figure, there are three types of umts channels viz. In case of dispute, the reference shall be the printing on etsi printers of the pdf version kept on a specific network drive. This is a downlink channel which is used to page mobile stations. Umts networks oliver waldhorst, jens muckenheim oct11 1 umts system architecture and protocol architecture overview on overall system architecture umts network architecture and elements mobile station highlevel functions umts domains and strata umtsgprs protocol architecture references. Introduction to umts technology 1 principles of wcdma 1 spread spectrum 1 protocols and channels 2 protocol architecture 2 layer 1 l1 or physical layer 2 layer 2 l2 or data link layer 2 layer 3 l3 or network layer 3 transport channels 4 downlink common and dedicated 4 uplink common and dedicated 4 logical channels 5 control channels 7. Each of the prose destination groups is associated with a priority.
More than 90 million umts users as of 1006 on operating networks in more than 50. Adaptive multimedia traffic multiplexing for dedicated channels in the umts system conference paper january 2004 with 10 reads how we measure reads. Though, umts was designed with qos in mind, we can still improve it by applying other technologies qos techniques. In p25 phase 2, a physical channel is divided into two time slots or logical channels. In p25 phase 1, a physical channel and logical channel are the same thing. An overview of the 3g network umts can in many aspects be looked upon as an extension to gsm and gprs. As they tranverse between layers they map to other layer frames. Feb 04, 2016 a logical channel is allocated to a rb.
Gsm channels university of engineering and technology. Generally, a multicore high performance cpu is required, such as intel core i3, i5, or i7 running at more than 1. It covers fcch, sch, bcch, ccch, rach, agch, pch, cbch, sacch, sdcch and facch. Aug 25, 2009 logical channels define what type of information is being transferred and transport channel defines how the information is being transferred. Umts long term evolution lte technology introduction. Gsm uses a variety of channels in which the data is carried. Introduction the universal mobile telecommunications system umts is the european 3rd generation mobile telecommunication system. Coherence bandwidth limits the maximum data rate of the channel. Umts channels logical,transport,physical umts channels. Logical channels reside between rlc sublayer and mac sublayer which are layer 2 protocols in lte protocol stack.
Lte eutran and its access side protocols radisys white paper 5 mapping of physical, transport and logical channels figure 7 depicts the mapping between different types of logical channels, transport channels, and physical channels in lte. Different logical channels are used for different tasks. The umts world is an 3g mobile system news and information provider. Transport formats in umts radio network controllers. A plurality of logical channels corresponding to a plurality of rbs are multiplexed and transmitted through one transport block i. This should serve as a basic explanation towards the gsm logical channels. After fcch decoding, the ms will continue to decode the sch channel message. Adaptive multimedia traffic multiplexing for dedicated.
A logical file is a database file that describes how data records contained in one or more physical files are presented to a program. Gain mtcc cch 256,1 sdl,n sync codes sccpch mbms control ch. A logical file is a view or representation of one or more physical files. The required protocol stacks can be based on the approach to use the ip layer provided. The universal mobile telecommunications system umts is a third generation mobile cellular system for networks based on the gsm standard. Umts networks andreas mitschelethiel, jens muckenheim nov. Abstract this paper proposes the utilization of gsm logical channels rach, agch and tch and umts signaling mib and sibs of the broadcast channel. Also the fdmatdma and cdmabased access technologies for 2g. For gsm1800 frequency spectrum of 75 mhz bandwidth is. For example speech is sent on the logical channel traffic channel which during the transmission is allocated a certain physical channel, say ts 6 on carrier 0. Hybrid umtswlan telecommunication system download pdf info. Logical channels tells what kind of information is transferred. In this study, we will outline the air interface similarities between wifi and umts, and after we focus on applying wifi qos techniques to umts networks. As shown in the figure there are two main types of channels in the gsm.
This message includes the information for ms frame synchronization and bs identification. This chapter explains the functionalities of these channels. Performance of tcp over umts common and dedicated channels. They are used to transport speech, user data, high layer signally, cell specific information to name a few. Gsm logical channels free download as powerpoint presentation.
Developed and maintained by the 3gpp 3rd generation partnership project, umts is a component of the international telecommunications union imt2000 standard set and compares with the cdma2000 standard set for networks based on the competing. View notes fdd mode from it 306 at bingham university. Relation of ue mac functions corresponding to the transport channel mac functions and. Logical channels reside between radio link control rlc and medium access control mac layer. The mac is responsible for mapping of logical channels onto the. Physical and logical channels gsm uses a mix of frequency division multiple access fdma and time division multiple access tdma. Cdma channels can be broadly categorized as forward channel and reverse channel. The invention relates to a method for for allocating radio resources to logical channels when performing a logical channel prioritization, lcp, procedure in a user equipment.
You should see the logical channel as an option to run multiple applications at the same time, where the logical channels are used to interleave commands over the single halfduplex communication channel. Lte uses several different types of logical, transport and physical channel, which are distinguished by the kind of information they carry and by the way in which the information is processed. Furthermore, it isnt said that the authentication or file system state is taken over by the new channel. Logical channels define what type of data is transferred. Umts networks andreas mitschelethiel, jens mueckenheim nov. This tutorial on umts covers umts logical channels, transport channels and physical channels. The information transmitted on a logical channel depends on a particular task. A copy of the license is included in the section entitled gnu free documentation license. Depending on the quantity of information to transmit and on their consistency, several logical channels may be mapped onto one physical channel, in order to use its successive time slots as much as possible optimization of the resources number by maximizing the occupancy duration of each. Wcdma osi model radio resource control rrc logical channels rlc rlc rlc what is transmitted medium access control mac transport channels how it is transmitted physical layer physical channels code,frequency,etc. The logical channels characterize the type of data that is transported. Common control channel l ccch gsm, umts and lte l downlink and uplink l control l common l used to deliver control information when there is no confirmed association between the ue and the network i.
In this tutorial different types of logical channels and transport channels and their mappings are described. Data and signalling messages are carried on logical channels between the rlc and mac layers. Paging channel pch there is always one channel required to page anything in general word call to mobile for call and any update to mobile which first direct using pch logical channel in 2g gsm. This channel broadcasts information to the ues in the cell to enable them to identify the network and the cell. These channels define the datatransfer services offered by the mac layer. A logical channel will carry information of a specific type and a number of these channels may be combined before being mapped onto the same physical channel.
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