MITP 413: Wireless Technologies Week 2

Slides:



Advertisements
Similar presentations
Chapter 7 1 Cellular Telecommunications Systems Abdulaziz Mohammed Al-Yami
Advertisements

Copyright © 2004, Dr. Dharma P. Agrawal and Dr. Qing-An Zeng. All rights reserved. 1 Chapter 5 The Cellular Concept.
Chapter 5 The Cellular Concept.
ITU-T Workshop on Delivering Good Quality Telecommunication Service in a Safe Environment in Africa (Nairobi, Kenya, 26 July – 27 July 2010 ) FREQUENCY.
May 4, Mobile Computing COE 446 Network Planning Tarek Sheltami KFUPM CCSE COE Principles of Wireless.
Copyright © 2003, Dr. Dharma P. Agrawal and Dr. Qing-An Zeng. All rights reserved. 1 Chapter 8 Traffic Channel Allocation.
Chapter 2 The Cellular Concept
Wireless & Mobile Networking: Channel Allocation
A Performance Analysis of Fixed and Dynamic Channel Allocation Schemes in Cellular Networks Author Muhammad Emran Co-authors Syed Asad Hussain, Saqib Hussain.
In this Lecture More on handoff Co-channel interference Trunking
Improving Capacity in Cellular Systems
CMPE 80N - Introduction to Networks and the Internet 1 CMPE 80N Winter 2004 Lecture 9 Introduction to Networks and the Internet.
Frequencies (or time slots or codes) are reused at spatially-separated locations  exploit power falloff with distance. Best efficiency obtained with minimum.
August 6, Mobile Computing COE 446 Network Planning Tarek Sheltami KFUPM CCSE COE Principles of.
Cellular Mobile Communication Systems Lecture 6
Lecture 11: Cellular Networks
Lecture 9: Wireless Networks Anders Västberg
Interference ,Trunking and GOS
doc.: IEEE /211r0 Submission March 2002 M. BenvenisteSlide 1 SELF-CONFIGURABLE WIRELESS LAN SYSTEMS Mathilde Benveniste, Ph.D.
CELLULAR CONCEPT SHUSHRUTHA K S “Provide additional radio capacity with no additional increase in radio spectrum”
MSc Mobile Computing Systems 1 Professor Rolando Carrasco BSc(Hons), PhD, CEng, FIEE
GSM.
Lecture 5: Cellular networks Anders Västberg Slides are a selection from the slides from chapter 10 from:
The Cellular Concept: System Design Fundamentals What if there is no power degradation for a transmitted signal? Transmission range is limited: the possibility.
CELLULAR NETWORK. Early mobile system Cellular Network Use of one powerful transmitter located on high location. Range of signals was upto 50km. These.
CELLULAR CONCEPT SHUSHRUTHA K S “Provide additional radio capacity with no additional increase in radio spectrum”
EELE 5490, Fall, 2009 Wireless Communications Ali S. Afana Department of Electrical Engineering Class 4 Sep. 30 th, 2009.
June 5, Mobile Computing COE 446 Network Planning Tarek Sheltami KFUPM CCSE COE Principles of Wireless.
INTRODUCTION. Homogeneous Networks A homogeneous cellular system is a network of base stations in a planned layout and a collection of user terminals,
1 Chapter 8 Traffic Channel Allocation. 2 Outline Introduction Static Allocation versus Dynamic allocation Fixed Channel Allocation (FCA) Dynamic Channel.
FREQUENCY MANAGEMENT AND CHANNEL ASSIGNMENT
WLAN.
Reuse Partitioning in Fixed Two-hop Cellular Relaying Network Reporter: Yi-Harn Lin Date: 2006/05/10.
The Cellular Concept Early Mobile Communications The Cellular Concept
Networked Systems Practicum Lecture 5 – Cellular Intro 1.
Computer Networks with Internet Technology William Stallings
Wireless Communications: System Design Dr. Mustafa Shakir.
 The purpose of wireless networks is to provide wireless access to the fixed network (PSTN)
WIRELESS COMMUNICATION THE CELLULAR CONCEPT- SYSTEM DESIGN FUNDAMENTALS LECTURE 4 1 Tanvir Ahmad Niazi Air University, Islamabad.
The Cellular Concept Early Mobile Communications The Cellular Concept
Wireless Communications: System Design Dr. Mustafa Shakir.
Unit 4 Cellular Telephony
Cellular Wireless Networks. Cellular Network Organization Multiple low power transmitters —100w or less Area divided into cells —Each with own antenna.
Fundamentals of Cellular Networks (Part III)
IMPROVING OF WIRELESS MESH NETWORKS.
Adv. Wireless Comm. Systems - Cellular Networks -
Cellular Networks Wireless Transmission Cellular Concept
Fundamentals of Cellular Networks (Part IV)
Chapter 6 Wireless and Mobile Networks
Cellular Concepts المحاضرة السادسة 03/07/2015 Omar Abu-Ella.
Managing the performance of multiple radio Multihop ESS Mesh Networks.
Chapter 3: Wireless WANs and MANs
Wireless Communication Mobile Communications Lecture 6
CS 457 – Lecture 7 Wireless Networks
William Stallings Data and Computer Communications
Wireless Ad-Hoc Networking
Royal Institute of Technology Dept. of Signals, Sensors and Systems
EEE 264-2:Capacity Increase Techniques and Calculations
Air University, Islamabad
MITP 413: Wireless Technologies Week 2
MITP 413: Wireless Technologies Week 3
MITP 413: Wireless Technologies Week 8
Dynamic Channel Allocation and Power Control
Week 13 lecture 2 Cellular Networks -- Interference
Resource Allocation Call Admission Control
Outline Cellular Concept Concept Of Frequency Reuse
A Survey on Static Frequency Assignment
Cellular Telephone Networks
Cellular Systems.
Presentation transcript:

MITP 413: Wireless Technologies Week 2 Michael L. Honig Department of ECE Northwestern University April 2004

Infrastructure vs. Ad-hoc Topologies Base station or Access Point Single-hop peer-to-peer Multi-hop peer-to-peer Infrastructure (cellular, LANs) Ad hoc (wireless LAN/PAN)

Infrastructure Configuration Single Cell Station A Station B Station C Access Point Access Point is analogous to a cellular Base Station System referred to as Infrastructure Basic Service Set (BSS)

Peer-to-Peer Configuration Single Cell Station C Station A A Service Set is a Collection of stations Station B Mobile devices are referred to as Stations. Each Station can communicate directly with another Station. System referred to as Independent Basic Service Set (IBSS)

Extended BSS (EBSS) Configuration Distribution System (DS) BSS Distribution System is a wired network (L2/L3 devices) connecting BSS Connect APs via a wired network DS consist of Layer 2, Layer 3 devices System referred to as Extended BSS APs have a BSSID System has a SSID Basic Service Area

Ad Hoc Networks Used originally for military tactical applications Enables rapid deployment Multihop provides reliability with unpredictable propagation, node failures 802.11: Terminal searches for a beacon signal from an AP or another terminal. If no beacon, then the terminal provides a beacon for the next terminal. The network is “self-configuring”. Coverage may be limited to maximum radio link distance (single-hop). Can be connected to a wired network through a proxy server. Typically terminals operate in dual-mode (ad hoc or infrastructure). Multihop routing requires “neighborhood” information. Multihop increases coverage, but adds delay. Power control, synchronization are relatively difficult.

Cellular Frequency Assignments B A C E D G A C B F D G A C B E F D G C B E F D G A C B E D G A C B F G A D cell cluster

Co-Channel Cells A A i=3, j=2 N=i2+ij+j2=19 A A A A A

Co-Channel Reuse Ratio 2 1 5 . 4 R 3 7 From hexagonal geometry D 6 2 1 5 . 4 3 7 6

First Tier Interference Cell Site-to-Mobile Interference (Downlink) Mobile-to-Cell Site Interference (Uplink)

First Tier Co-Channel Cells D First Tier 1 R Interfering Cell

SIR vs. Frequency Reuse

Worst Case Interference D D+R D-R D R D-R D+R D

Sectorization (120o) Cell Site-to-Mobile Interference (Downlink) Two Interferers in First Ring per Sector 120o 120o 120o Cell Site-to-Mobile Interference (Downlink) Mobile-to-Cell Site Interfaces (Uplink)

60o Sectorization Cell Site-to-Mobile Interference (Downlink) One Interferer in First Tier per Sector 60o 60o 60o 60o 60o 60o Cell Site-to-Mobile Interference (Downlink) Mobile-to-Cell Site Interfaces (Uplink)

60o Sectorization: Worst Case Interference 2 . D + 0.7 R . R . M D . 1

Growing by Splitting Cell 4 Into Cell Splitting 2 2 1 5 1 5 (4) (2) (3) (6) (7) (5) (1) 4 1 1 3 7 3 7 6 3 6 3 Growing by Splitting Cell 4 Into Cells of Small Size

Zone Microcells Any channel can be assigned to any zone. Base Station Zone Selector Microwave or fiber optic link Any channel can be assigned to any zone. No handoff between zones. Radiation localized, improves S/I. Highways, urban corridors.

Zone Microcells: Co-Channel Distance . D DZ RZ R 3 hexagons (zones) per cell N=7 DZ/RZ = 2(D/R) (less interference with same frequency reuse)

Erlang B Curves

Channel Allocation Objective: equalize grade of service (blocking probability) over coverage area  Allows increase in subscriber pool. Fixed Channel Assignment (FCA): channels assigned to each cell are predetermined. Separate channels within a cell to avoid adjacent-channel interference Nonuniform FCA: distribute channels among cells to match averaged traffic load over time. Channel borrowing: borrow channels from neighboring cell Temporary: high-traffic cells return borrowed channels Static: channels are non-uniformly distributed and changed in a predictive manner to match anticipated traffic Dynamic Channel Assignment (DCA): channels are assigned to each call from the complete set of available channels Must satisfy S/I constraint Channels returned to pool after call is completed Can be centralized (supervised by MSC) or distributed (supervised by BS) Distributed DCA used in DECT

FCA vs. DCA FCA DCA Low complexity Better under heavy traffic Sensitive to changes in traffic Variable grade of service Higher probability of outage Suitable for macro-cellular systems (e.g., cellular) Low call setup delay Requires careful frequency planning Centralized assignment Moderate/High complexity Must monitor channel occupancy, traffic distribution, S/I (centralized) Better under light/moderate traffic Insensitive to changes in traffic Stable grade of service Low probability of outage (call termination) Suitable for micro-cellular systems (e.g., cordless) Moderate/high call setup delay No frequency planning Assignment can be centralized or distributed