Wireless_Data_Services_In_Cdma2000.ppt

wireless data services in cdma2000,by mohammed yousuf shareef st id#220326,introduction,cdma-code division multiple access. spread spectrum technique using direct sequence i.e. each data bit is represented (spread) by multiple bits in transmitted signal. cdma2000-multi carrier mode cdma it supports data rates both circuit and packet switched of 9.6kbps to 2 mbps. operates in wide range of environments outdoor mega cells(cells 35km radius) outdoor macro cells(1-35 km radius) indoor/outdoor micro cells(1km radius) indoor/outdoor pico cells(50-m radius),contd,cdma2000 can be deployed in indoor/outdoor environment wireless local loops vehicular environments mixed vehicular & indoor/outdoor environments cdma2000 services support overlay configuration backward compatibility to tia/eia-95b signaling & network graceful & gradual upgrade from 2g to 3 g systems common channels with an underlay tia/eia-95b system during transition periods,contd,cdma 2000 is a radio and network access system that is part of the imt-2000 (itu) specification suite of 3g systems. goals of imt-2000:global standard. high speed packet data services: 2mbps for stationary use. 384kbps for pedestrian use. 144kbps for vehicular use. 3g applications enabled by cdma 2000: packet based services like, wireless internet, e-mail, ecommerce and multimedia, location based services, longer battery life.,evolution of wireless technologies,wireless technologies,1g analog based cellular technology services voice 2g digital technologies services voice low rate data 3g services voice high speed data,1st gen,2g,3g,evolution of wireless technologies,cdma 2000 enables migration from and seamless backward compatibility to cdmaone 2g to 3g without fork-lifting the legacy system. cdma 2000 migration path: cdma 2000-1x (1xrtt) currently available. incorrectly considered 2.5g. first version of cdma 2000 by qualcomm. 144kbps data rate and 1.5 times the voice capacity. 1xev-do (hdr) evolution of 1x to provide high data rate only, over a separate carrier. 2.4mbps downstream and 300kbps upstream.,evolution of wireless technologies,1xev-dv evolution of 1x to provide high data rate and voice capacity. 5.2mbps. cdma 2000-3x (3xrtt) conceptual phase. use of a new 3.75mhz (3 x1.25mhz) spectrum.,cdma advantage,gsm is discrete with no forward and backward compatibility cdma terminals are fully forward and backward compatible.,approximate download time for 3 minute mp3,network max.data rate download time gsm 9.6kbps 41 minutes is95-a cdma 14.4kbps 31 minutes gprs 45kbps 9 minutes is95-b cdma 64kbps 6 minutes cdma 2000-1x 307kbps 1.5 minutes wcdma 384kbps 61 seconds cdma2000 1xev-do 2.4mbps 11 seconds,cdma 2000 forward link,cdma 2000 forward link,spreading rates sr1 (1.2288mcps) and sr3 (3xrtt). nine forward link radio configurations rc1 - rc9. each rc is characterized by physical layer parameters such as different modulation and coding. rc max. data rate code rate sr 1 9.6kbps 1/2 sr1 2 14.4kbps 1/2 sr1 3 153.6kbps 1/4 sr1 6 307.2kbps 1/6 sr1 9 1.036mbps 1/3 sr1,cdma 2000 forward link,new common channels: 7 forward common control channels (f-ccch) signaling and mac messages. 8 forward broadcast control channels (f-bcch) paging messages. - specifically for cdma2000 mobiles to reduce load on cdmaone channels. forward common auxiliary pilot channel (f-caich) used to generate spot beams in a particular area (hot spot). 3 forward quick paging channels (f-qpch) indicator to the mobile to wake up for a message on the paging channel. useful for conserving battery during idle time. 4 forward common power control channels (f-cpcch) used to control the reverse access channels.,cdma 2000 forward link,dedicated channels: cdmaone: forward fundamental channel (f-fch) primarily for voice, but may carry data up to 14.4kbps. is-95b (2.5g): up to 7 forward supplemental code channels (f-scch) per user strictly for data traffic supporting either rc1 or rc2. multiple channel aggregation: 9.6 - 115.2kbps. new dedicated channels: forward dedicated common control channel (f-dcch) high-priority data traffic, such as data re-transmissions. up to 2 forward supplemental channels (f-sch) per user also only for data, but supports rc3 through rc9.,cdma 2000 reverse link,cdma 2000 reverse link,new common channels: reverse enhanced access channel (reach). reverse common control channel (rccch). used to provide more reliable and power efficient access. dedicated channels: cdmaone: reverse fundamental channel (r-fch). is-95b (2.5g): up to 7 reverse supplemental code channels (r-scch) per user. new dedicated channels: reverse dedicated control channel (r-dcch). up to 2 reverse supplemental channels (r-sch) per user. reverse pilot channel (r-pich) improves reception at the receiver. power control bits multiplexed (at 800hz) for forward link power control.,packet data call,packet data call,a)in origination message, mn requests packet data service (can also request supplementary services like fax over circuit.) b) bsc acknowledges. c) bsc sends service request message to msc. d) after authentication, msc sends channel assignment request message. e) forward and reverse channel assignment procedures (same as (e) thru (j). f) a9-setup-a8 message to pcf to establish a8 connection. g) procedure for establishing a10/a11 connection between pcf and pdsn (r-p interface). h) pcf transmits a9-connect-a8 message to bsc. i) bsc transmits assignment complete message to msc. j) ppp connection establishment procedure and mobile ip registration procedure initiated.,3g network architecture,contd,ip mobility ability to move with an ip address while the connection using the ip address is active ip mobility may be provided by a combination of “ran mobility” and “cn mobility” radio access network ip mobility handoff/handover cell selection/reselection core network ip mobility mobile ip, gprs,cdma2000 network architecture,aaa: authentication, authorization and accounting fa: foreign agent gr: gateway router ha: home agent pdsn: packet data serving node,cdma2000 packet data network architecture,cdma2000 layering structure,upper layer services voice end user data bearing services signaling lower layer link access control(lac) media access control(mac),contd,lac manages point to point communication channels mac provides 3 functions media access control state best effort delivery multiplexing & qos control,cdma2000 layer structure,layer functions signaling control data services voice services mac control states qos resource allocation multiplexing coding & modulation,packet data mac operation states in cdma2000 &tia/eia-95b,contd,active state traffic,pc and control channels assigned control hold state pc and control channels assigned very fast traffic channel reassignment suspended state no dedicated channels fast traffic channel reassignment rlp state may be maintained ppp state maintained slotted sub mode,contd,dormant state no dedicated channels no bs,msc resources ppp state maintained short data bursts,channel bandwidths and data rates supported by cdma2000,services of cdma2000 networks,short message services (sms) low cost/high value services increased network traffic higher profits and greater customer loyalty message over ip-sms over-the-air services e-mail distribution unified messaging: the end-user can send, retrieve and manage e-mail, voice mail and fax mail with one subscription, to one service, provided by one operator.,aaa services cdma2000 networks,aaa services of cdma2000 networks migrate from a “one size fits all” model to personalized services package premium services for both residential and corporate users collect detailed usage information for flexible billing options track resource usage in real time for guaranteed access and access control. aaa consists of three key functions: authentication recognize the user authorization enforce access controls and deliver services accounting track users usage of network resour