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Session 1 : Evolution path towards 4G

Technology Evolution and Regulation

Speakers M. Lazhar BELHOUCHET

M. Hakim EBDELLI

Date 27 - 29 January 2010

www.cert.nat.tn 1 Evolution path towards 4G

ITU/BDT Arab Regional Workshop on "4G Wireless Systems" - Tunisia 2010

Agenda

o Terminology

o Drivers of Mobile Networks Evolution

o Enablers of Mobile Networks Evolution

o ITU Work : Spectrum, Study Groups,

Recommandations and Schedule

www.cert.nat.tn 2 Evolution path towards 4G

ITU/BDT Arab Regional Workshop on "4G Wireless Systems" - Tunisia 2010

Terminology

- Throughput: the gross bit rate

that is transferred physically Goodput

- Goodput: the application

level throughput, the

7. Application

6. Presentation

7. Application

6 Presentation

i.e. number of useful bits per unit

of time forwarded by the

network 5. Session

4. Transport

6. 5. Session

from a certain

4. Transport

source address to a certain

destination,

e cl ding protocolo erhead

3. Network

2. Data Link

3. Network

2. Data Link

excluding protocol overhead,

and excluding retransmitted

data packets

1. Physical 1. Physical

Throughput

www.cert.nat.tn 3 Evolution path towards 4G

ITU/BDT Arab Regional Workshop on "4G Wireless Systems" - Tunisia 2010

Terminology - Cont.

- Capacity: it's the maximum number of users or the total data throughput

a network can support reliably. It relies on traffic loading, traffic patterns,

cell site equipment capability, and hardware dimensioning.

- Multiple Access technique :defines how terminals transmit over the

same transmission medium and share its capacity. Examples:

o Circuit mode channel access methods :FDMA, TDMA, CDMA, SDMA,

OFDMA

o Contention based multiple access methods: Aloha, CSMA/CD

(Ethernet), CSMA/CA,...

- multiplexing : is a process where multiple signals/streams are combined

into one signal over a shared medium : FDM, TDM

- Dupplexing techniques: define how to divide UL and DL communication

channels same physical communication medium

www.cert.nat.tn 4

on the Evolution path towards 4G

ITU/BDT Arab Regional Workshop on "4G Wireless Systems" - Tunisia 2010

Terminology - Cont.

- Cell Spectral efficiency: the aggregate throughput of all users (the

number of correctly received bits) divided by the channel bandwidth

divided by the number of cells. The channel bandwidth is defined as

the effective bandwidth times the frequency reuse factor. It's

measured in bit/s/Hz/cell.

- The peak spectral efficiency is the highest theoretical data rate

(normalised by bandwidth), which is the received data bits assuming

error-error free conditions assignable to a single mobile station, when all

available radio resources for the corresponding link direction are

utilised

- Frequency Reuse factor: is the rate at which the same frequency can

be used in the network. It is 1/K where K is the number of cells which

cannot use the same frequencies for transmission.

www.cert.nat.tn 5 Evolution path towards 4G

ITU/BDT Arab Regional Workshop on "4G Wireless Systems" - Tunisia 2010

Terminology - Cont.

o Control plane (C-Plane) latency is

typically measured as the

transition time from different

connection modes, e.g., from idle

to active state.

o User plane latency : (also known

as transport delay) is the transit

time between a packet being

available at the IP layer in the

user terminal/base station and

the availability of this packet at IP

layer in the base station/user

terminal.

www.cert.nat.tn 6 Evolution path towards 4G

ITU/BDT Arab Regional Workshop on "4G Wireless Systems" - Tunisia 2010

Drivers of Technology Evolution (Mobile Networks)

o Higher bit rates to meet user demands and support more

services

o Better spectral efficiency

o More capacity

o Better Mobility and Roaming

o Better quality of service

o Less delay (latency)

o Simplified architecture

o Lower costs

o Use of new opportunities

www.cert.nat.tn 7

spectrum Evolution path towards 4G

ITU/BDT Arab Regional Workshop on "4G Wireless Systems" - Tunisia 2010

Enablers of Technology Evolution (Mobile Networks)

o Terminals: Laptops, Phones with camera

o Cost of network equipments is decreasing

o Services: video (video sharing websites...), e-

Government, Peer-to-Peer (torrents)

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Telecomunicatii
Tag-uri:
telecomunicatii, gsm, cdma, 4g, wireless
Data publicare:
24.06.2014
Structură de fișiere:
  • doc2lte_workshop_tun_session1_evolution_path_towards_4g.pdf
  • modul2gsmairinterface131010060634phpapp02.ppt
Predat:
Facultatea de Electronica, Telecomunicatii si Tehnologia Informatiei , Universitatea Politehnica Bucuresti din Bucuresti
Specializare:
Tehnologii si sisteme de telecomunicatii
Materie:
Sisteme de comunicatii
An de studiu:
III

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