Wi-Fi Telephony: Challenges and Solutions for Voice over WLANs

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Newnes, Apr 1, 2011 - Technology & Engineering - 288 pages
2 Reviews
Wi-Fi telephony is the latest, most cost effective, and clearest way of carrying voice data wirelessly. The great news is that it can be integrated seamlessly into the same infrastructures as currently used for computer and telephone data.The digital quality is far above current cellular technologies.

This book will be among the first to discuss Session Initiation Protocol (SIP), Quality of Service (QoS), and interoperability in connection with Wi-Fi telephony. Security challenges are also presented and solved along these malleable wireless boundaries. In short, this book provides all the information necessary for effective, reliable, crystal clear Wi-Fi telephony service and implementation.

*Using current telephone and computer infrastructure this technology can be implemented at low cost
*The importance of Quality of Service (QoS) and security of Wi-Fi telephony is considered
*Enhances the clarity of a call beyond a basic cellular phone using digital data transfer
 

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Read a portion of Chapter 8 "Roaming" on Scanning types. The concepts have been presented very clearly. Haven't read sufficiently big part of the book to rate it as 5. But since I got enough information from the number of pages I read, rating it as 4.

Contents

683 IP Network
139
684 LANonly QoS
140
610 Admission Control
143
6101 Traffic Categories and Admission Control
145
6103 Some Issues With TSPECs
146
Security
147
72 Key Establishment in 80211
148
73 Anonymity in 80211
149

15 Voice and Wireless Networks
13
152 SecondGeneration Wireless Networks
14
153 ThirdGeneration Wireless Networks
20
16 Summary
22
The Data World
23
23 The OSI SevenLayer Model
24
24 The IP Protocol
28
25 The TCPIP Transport Layer
32
252 User Datagram Protocol UDP
38
27 Conclusion
41
Voice over IP
43
311 Motivation for VoIP
44
312 Challenges in VoIP
45
32 Putting Voice Over Internet
47
33 VoIP Architectures
50
34 Signaling Protocols
52
341 Media Gateway Control Protocol
53
342 MegacoH248
62
343 H323
63
344 Session Initiation Protocol SIP
66
35 VoiceoverIP Media
74
36 The Overall Picture
76
References
77
Wireless Local Area Networks
79
42 The Alphabet Soup
80
43 Network Architecture
82
431 Connection Setup
84
44 80211 Framing
86
442 DurationID
89
444 Sequence Control
90
446 Frame Check Sequence FCS
91
451 CSMACD
92
453 Positive ACK
95
456 InterFrame Spacing IFS
97
457 RTSCTS
98
46 80211 PHY
99
461 PLCP Framing
100
462 Transmission Rate
103
463 Nonoverlapping Channels
104
464 Power Consumption
106
48 Conclusion
108
VoWLAN Challenges
109
53 System Capacity and QoS
110
531 Packet Sizes
111
532 Packetization Overheads
112
533 DCF Overheads
113
534 Transmission Rate
114
535 Inherent Fairness Among All Nodes
116
536 Analysis
118
54 PCF
119
55 Admission Control
120
56 Security
121
58 RoamingHandoffs in 80211
122
59 Summary
124
QoS and System Capacity
125
62 80211e WME and Vanilla WLANs
126
63 Traffic Categories
128
64 Transmission Opportunity
129
65 EDCF
131
66 HCF
135
67 Voice Data Coexistence
137
681 Wireless LAN
138
74 Authentication in 80211
150
741 Open System Authentication
152
743 Authentication and Handoffs
154
744 Whats Wrong with 80211 Authentication?
155
75 Confidentiality in 80211
156
751 Whats Wrong with WEP?
157
76 Data Integrity in 80211
159
77 Loopholes in 80211 Security
162
78 WPA
163
781 Key Establishment
164
782 Authentication
168
783 Confidentiality
171
784 Integrity
172
Confidentiality + Integrity
174
79 WPA2 80211i
175
791 Key Establishment
176
794 Integrity
178
Confidentiality + Integrity
179
710 Beyond 80211 Security
182
Security at Layer 3
183
Security at Layer 4
187
7103 SRTP
190
711 Conclusion
192
Roaming
193
82 Types of Roaming
194
83 Roaming Issues
195
84 Roaming and Voice
197
Scanning
199
851 Scanning Types
200
852 Scanning Strategies
203
853 Other SiteTable Management Techniques
204
86 When to Roam
205
87 Where to Roam
206
88 Reauthentication Delays
207
89 InterESS Roaming
208
810 Future Enhancements
210
8102 80211r
211
811 Conclusion
212
Power Management
213
93 Designing for Power Management
215
931 PowerAware System Design
216
94 Implementing Power Management
222
942 LCD and Backlight
229
943 Host Processor
230
945 Memory
231
95 An Operational Perspective
232
952 Maximizing Standby Time
234
Voice over WiFi and Other Wireless Technologies
235
1021 80211n
238
1022 80211p
239
1024 80211t
240
103 WiFi and Cellular Networks
241
1031 DualMode Issues
242
1032 Convergence Strategies
243
104 WiMax
251
105 VoWiFi and Bluetooth
252
106 VoWiFi and DECT
256
107 VoWiFi and Other Ongoing 802x Wireless Projects
258
1073 80222
259
108 Conclusion
260
Index
261
Copyright

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Page xiv - CSMA-CA Carrier Sense Multiple Access with Collision Avoidance CSMA-CD Carrier Sense Multiple Access with Collision Detection CTS Clear To Send D
Page 9 - the signals to set up a call between one switch and another always took place over the same trunk that would eventually carry the call.

About the author (2011)

David A. Lide currently is a Senior Member of the Technical Staff at Texas Instruments and has worked on various aspects of Voice over IP for the past nine years. Prior to that, he has worked on Cable Modem design and on weather satellite ground systems. He lives with his family in Rockville, Maryland.

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