An overview of the 3g network umts can in many aspects be looked upon as an extension to gsm and gprs. Logical control channels carry signaling messages in the control plane. Based on, as mentioned earlier, whether they carry gsm traffic ie, speech or data or gsm. Channel allocation for umts multimedia broadcasting and multicasting article pdf available in ieee transactions on wireless communications 711. Broadcast control channel bcch it used for broadcasting mibssibs. Like any form of wireless data link, the data needs to be managed to enable the system to handle it efficiently and effectively.
Logical channels define what type of information is being transferred and transport channel defines how the information is being transferred. This is the only channel type enabling pointtomultipoint communications in which short messages are simultaneously transmitted to several mobiles. Control channels are use for transferring control plane information. Logical channels reside between rlc sublayer and mac sublayer which are layer 2 protocols in lte protocol stack. All these kinds of messages are classified in logical channels. 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. A prose logical channels are configured in the ue and are associated with a prose destination group. They are used to transport speech, user data, high layer signally, cell specific information to name a few. 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. Every gsmgprs physical channels are mapped to one of these burst types and the mapping is described below. Cdma channels can be broadly categorized as forward channel and reverse channel. 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.
Introduction in telecommunications a channel, refers either to a physical transmission medium such as a wire, or to a logical connection over a multiplexed medium such as a radio. Wireless systems with updated information 2004 by the althos publishing inc. Umts networks oliver waldhorst, jens muckenheim oct11 4 umts network architecture basic configuration, release 3 bss bsc rns rnc cn node b node b a iups iur iub uu msc sgsn gs gmsc ggsn hlr gn gr gc c d e auc h eir f gf pstn gi gb iucs vlr b gp vlr g bts bts um rnc abis msc b pstn pstn source. Physical channels, logical channels, network, and operation use this concise guide to learn the fundamental components, basic operation, services, and terminology used for umts code division multiple access cdma systems. Physical and logical channels gsm uses a mix of frequency division multiple access fdma and time division multiple access tdma. 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. In downlink there are 4 control channel which carried common channel information as well as dedicated channel information.
The greatest changes are related to the access part of the network. Learn more about introduction to wcdma physical channels, logical channels, network, and operation on globalspec. Logical channels in gsm are defined by the type of information that is carried over them. Umts air interface course description this course provides a comprehensive and detailed explanation of the umts air interface. Based on, as mentioned earlier, whether they carry gsm traffic ie, speech or data or. 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. 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. As shown in the figure there are two main types of channels in the gsm. Consists of many logical network elements similar to the 2g systems. The defintion of logical channels and details of traffic channels has been discussed in the previous.
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. Transport channels, logical channels, radio bearers. Please introduce links to this page from related articles. Umts etsi proposed gsmnatdma gprs evolution under name universal mobile telecom.
This channel broadcasts information to the ues in the cell to enable them to. The broadcast channels bch carry only downlink information and are responsible mainly for synchronization and frequency correction. Umts logical channels and transport channels 3glteinfo. As they tranverse between layers they map to other layer frames. In the downlink, data frames from higher layer transport channels. Transport channel, logical channel and macd flow numbering. Umts long term evolution lte technology introduction. One topic that often causes confusion in digital radio networks is the difference between physical and logical channels. Enhanced uplink dedicated channel edch high speed uplink. Introduction in telecommunications a channel, refers either to a physical transmission medium such as a wire, or to a logical connection over a multiplexed medium such as a radio channel. Channel allocation for umts multimedia broadcasting and multicasting. Jan 11, 20 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. These channels define the datatransfer services offered by the mac layer.
Control channels for the transfer of control plane information traffic channels for the transfer of user plane information control channels. Umts bearer services endtoend service umts bearer service external bearer service local bearer service utra service radio bearer service iu bearer service physical bearer. Evolutionary analysis of gsm, umts and lte mobile network architectures. Introduction to wcdma physical channels, logical channels. Half rate traffic channels at a net bit rate of 11. Firstly, logical traffic channels carry data in the user plane, while logical control channels carry signalling messages in the control plane. Different bursts are mapped to these channels uniquely as per gsm technical specification 05.
Baseband processing in 3g umts radio base stations diva. Irving2,b 1 department of computer science, federal university lafia, nasarawa state, nigeria 2 department of computing, engineering and technology, university of sunderland, sunderland, sr6 0dd, united kingdom. Lte logical channels structure and mapping between logical channels and transport channels. Data and signalling messages are carried on logical channels between the rlc and mac layers. By doing this, the payload data as well as the control and status data can be carried in an efficient manner. 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. Channel structure is the division and coordination of a communication channel information transfer into logical channels, frames groups of data. One of those frequency channels is defined as the basefrequency beacon frequency or bcch frequency. This chapter explains the functionalities of these channels.
Cell configuration when an enodeb comes up, it involves initialization. Logical channels control measurements transport channels layer 3 layer 2 layer 1. Simply put, this means in direct radio to radio communication the same frequency may be used for. Logical channels define what type of information is transferred. Here, we explain the main type of the control chanels like broadcast channels bchs.
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. Aug 25, 2009 logical channels define what type of information is being transferred and transport channel defines how the information is being transferred. The following picture depicts the logical channel hierarchy. Evolutionary analysis of gsm, umts and lte mobile network.
Objectives are higher data rates, lower latency on the user plane and control plane and a packetoptimized radio access technology. Comprehensive coverage of umts 3g news, licensing, business developments, 3g wcdma telecommunication technology, multi media mobile phones and future communications. In p25 phase 1, a physical channel and logical channel are the same thing. Umts networks andreas mitschelethiel, jens muckenheim nov. This article is an orphan, as no other articles link to it. 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. Umts channels logical,transport,physical umts channels. Logical transport channels mappings in 4g lte previously we have seen how data is a transmitted over the air. Gsm channels university of engineering and technology. The contents of the present document are subject to continuing work within the tsg and may change following formal. Dedicated logical channels are allocated to a speci. This video explains the logical channels in the gsm global system for mobile and their usage. Each of the prose destination groups is associated with a priority. Jan 14, 2011 logical channels in gsm are defined by the type of information that is carried over them.
May 20, 2015 all these kinds of messages are classified in logical channels. The umts terrestrial radio access network utran consists in bs node the 3g term for bts and radio network controllers rncs connected by atm network. Followings are the types of burst being used in gsmgprs. In so doing, the architecture of the radio interface, 6 channel structures, the cdma physical layer, the. The physical channels are determined by the timeslot, whereas the logical channels are determined by the information carried within the physical channel. In gsm as well, we have many different types of physical and logical channels and each of these channel types are using its own physical structure at the level of a slot burst. Data channels data channels support a variety of data rates 2. Mapping of these channels is shown in below pictures. That why, a logical channel determines the kind of information it uses. Logical channels are distinguished by the information they carry and can be classified in two ways.
Services umts most of 3g licenses in europe required operator to deploy. Logical channels can be broadly divided into two types. For gsm1800 frequency spectrum of 75 mhz bandwidth is. A physical radio channel is a radio frequency or pair of frequencies that is allocated by the regulatory body to an agency for communication.
Pdf channel allocation for umts multimedia broadcasting. Umts is evolved from gprs to replace the radio access network. Coherence bandwidth limits the maximum data rate of the channel. Logical channels tells what kind of information is transferred. Pdf channel allocation for umts multimedia broadcasting and. The umts channels are communication channels used by third generation 3g wireless universal mobile telecommunications system umts networks. Lte is also referred to as eutra evolved umts terrestrial radio access or eutran evolved umts. The forward channel is the direction of the communication or mobiletocell downlink path. Services umts most of 3g licenses in europe required operator to deploy a umts system covering x% of population by a specific date y germany.
Some of the channels on the wcdma system use separate coding so they can be simultaneously transmitted and decoded by the receiver and other channels are logical channels that share a coded channel. A gsm basestation called base transceiver station or bts has one or more gsm frequency channels arfcn. The umts world is an 3g mobile system news and information provider. In gsm, these channels are separated into physical channels and logical channels. 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. Radio resource management in 3g umts networks diva portal. As shown in the figure, there are three types of umts channels viz.
The rnc, node b and ms together are called the serving radio network system srns. Umts overview david tipper associate professor graduate telecommunications and networking program university of pittsburgh 2720 slides 12 telcom 2720 2 umts etsi proposed gsmnatdma gprs evolution under name universal mobile telecom. Logical channels reside between radio link control rlc and medium access control mac layer. Mapping between logical channels and transport channels. In this tutorial different types of logical channels and transport channels and their mappings are described. Gsm uses a variety of channels in which the data is carried. The cross reference between gsm, umts, 3gpp and etsi identities can be found under. May 26, 2016 the defintion of logical channels and details of traffic channels has been discussed in the previous video. Following table lists the logical channels that are used by lte. Radio protocols medium access control mac protocol. The universal mobile telecommunications system umts is a third generation mobile cellular system for networks based on the gsm standard.
For umts radio access for third generation mobile communications third edition edited by harri holma and antti toskala both of nokia, finland. In summary, a physical radio channel is the frequency or frequency pair allocated by the regulatory body. In case of dispute, the reference shall be the printing on etsi printers of the pdf version kept on a specific network. Evolutionary analysis of gsm, umts and lte mobile network architectures paschal a. This tutorial on umts covers umts logical channels, transport channels and physical channels. The channels logical, transport and physical mapping information through the channels the umts terrestrial radio access network utran requirements of the utran utran nodes and their functionality node b controlling radio network controller serving radio network controller drift radio network controller general interface. Control channels for the transfer of control plane information traffic channels for the transfer of user plane. Aug 03, 2017 in lte we have 7 logical channel in downlink and 3 logical channels in uplink. In p25 phase 2, a physical channel is divided into two time slots or logical channels.
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