gprs general packet radio servicegreg/zajecia/techmob/wyklad_7 gprs edge.… · gprs general packet...

Technologie mobilne w sieciach komputerowych 1

GPRSGeneral Packet Radio Service


"Always on" internet access

Multimedia messaging service (MMS)

Push to talk over cellular (PoC/PTT)

Instant messaging and presence

Internet applications for smart devices through wireless application protocol (WAP)

Point-to-point (P2P)

http://en.wikipedia.org/wiki/Multimedia_Messaging_Service

http://en.wikipedia.org/wiki/Push_to_talk

http://en.wikipedia.org/wiki/Instant_messaging

http://en.wikipedia.org/wiki/Wireless_Application_Protocol

http://en.wikipedia.org/wiki/Point-to-point_%28telecommunications%29


Class A

Can be connected to GPRS service and GSM service (voice, SMS), using both at the same time.

Class B

Can be connected to GPRS service and GSM service (voice, SMS), but using only one or the other at a given time. During GSM service (voice call or SMS), GPRS service is suspended, and then resumed automatically after the GSM service (voice call or SMS) has concluded.

Class C

Are connected to either GPRS service or GSM service (voice, SMS). Must be switched manually between one or the other service.


GGSNGateway GPRS Support Node

SGSNServing GPRS Support Node

GTPGPRS tunnelling protocol


SGSNServing GPRS Support Node

Routing Area (RA)

Routing Area Identity (RAI)

●szyfrowanie

●autoryzacja

●mobilność


Access Point Name (APN)

aricenttechnologies.mnc012.mcc345.gprs

Internet

mywap


GGSNGateway GPRS Support Node

przydziela numer IP

aktywuje PDP context

Subscriber's IP address

Subscriber's IMSI

Subscriber's

Tunnel Endpoint ID (TEID) at the GGSN

Tunnel Endpoint ID (TEID) at the SGSN

http://en.wikipedia.org/wiki/IP_address

http://en.wikipedia.org/wiki/International_Mobile_Subscriber_Identity


GPRS tunnelling protocol

GTP-U dane

GTP-C kontrola

GTP' rachunki


SubNetwork Dependent Convergence Protocol (kompresja)

Logical Link Control (szyfrowanie)


Enhanced Data Rates for GSM Evolution

EDGE


Incremental redundancy

Hybrid automatic repeat request (HARQ)


PSK/8 Phase shift keying zamiast

Gaussian Minimum Shift Keying

3 bity na każdą zmianę fazy fali nośnej→ 3x większy strumień danych


236.8 kbit/s / 4 szczeliny (4x GPRS)

473.6 kbit/s / 8 sczczelin (max)


Evolved EDGE

Jeszcze wyższe modulacje (32 i 16 Quadrature Amplitude Modulation)

Reduced Transmit Time Interval (RTTI)

Prędkości ~600 kbit/s(teoretycznie nawet do 1 Mbit/s


TTI

RTTI

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