Mobile Video Telephony: for 3G Wireless Networks / Edition 1

by David Myers

Overview

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This is a system level design book aimed at the engineers deploying mobile video services around the globe. Pulling the relevant pieces from the many confusing standards and protocols surrounding video telephony, the book serves as a roadmap through the regulatory maze, as well as a detailed tutorial on each phase of deployment, from video compression through multiplexing and call control.

Product Details

ISBN-13:	9780071445689
Publisher:	McGraw Hill LLC
Publication date:	11/15/2004
Series:	Professional Engineering
Pages:	250
Product dimensions:	6.00(w) x 9.00(h) x 1.00(d)

About the Author

David J. Myers (Sidney, Australia) is a co-founder of Dilithium Networks and was its first Vice President of Engineering. A multiyear veteran of British Telecom's R&D division, he served as Broadband Delivery Manager for BTopenworld, the largest broadband provider in the United Kingdom. He has also lectured on telecommunications engineering at Sydney University, and acted as a technical consultant to the European Commission.

Table of Contents

	Foreword	xiii
	Acknowledgments	xv
	Introduction	xvii
Chapter 1	Migrating to Third-Generation Mobile Networks	1
1.1	2G Mobile Networks	1
1.1.1	The GSM base station subsystem	2
1.1.2	The 2G mobile core network	3
1.2	Evolution to 3G	4
1.2.1	Technology drivers	5
1.2.2	The evolution path to 3G	6
1.3	3G Mobile Networks	6
1.3.1	The radio access network	7
1.3.2	The 3G mobile core network	8
1.4	Mapping Video Telephony Services onto 3G Networks	8
1.5	Chapter Summary	10
Chapter 2	Basics of Multimedia Communication	11
2.1	Features of Multimedia Communication	11
2.2	Sending and Receiving Control, Media, and Data Information	15
2.3	Transmission over Packet Networks	15
2.4	Transmission over Circuit-Switched Networks	17
2.4.1	Multiplexing	17
2.4.2	Detecting multiplexer frames	19
2.4.3	Error protection	21
2.4.4	Guaranteeing delivery of control information	22
2.5	Establishing a Multimedia Session: Command and Control	24
2.5.1	Describing signaling entities	25
2.5.2	Specification and description language	27
2.5.3	Message syntax, semantics, and representation: ASN.1 and PER	29
2.6	Components of a Multimedia User Terminal	34
2.7	Multimedia Standards	36
2.7.1	Standards making bodies	36
2.7.2	ITU-T standards	37
2.7.3	Relevant IETF standards	39
2.7.4	ISO standards	39
2.7.5	3GPP and 3GGP2	39
2.7.6	The hierarchy of standards making up 3G-324M	40
2.8	Chapter Summary	40
Chapter 3	Media Coding	43
3.1	Principles of Speech Coding	43
3.2	The G723.1 Speech Codec	45
3.3	The GSM-AMR Speech Codec	46
3.4	Principles of Video Coding	46
3.4.1	Describing video	47
3.4.2	DCT-based compression	48
3.4.3	Motion compensation	50
3.4.4	The hybrid video codec	51
3.4.5	Algorithmic variants of hybrid coding	52
3.4.6	Bit-stream formats for video	52
3.5	The H.263 Recommendation	53
3.6	The MPEG4 Video Codec	54
3.7	Chapter Summary	56
Chapter 4	Video Telephony over Mobile Switched Networks	57
4.1	The H.324 Recommendation	57
4.2	H.324M	59
4.3	The 3G-324M Recommendation of 3GPP	60
4.4	Logical Channels	61
4.5	Introduction to the H.223 Multiplexer	62
4.5.1	The adaptation layers	63
4.5.2	The MUX layer	64
4.5.3	Mobile levels	64
4.5.4	Initializing multiplexers at the start of a session	65
4.6	Introduction to H.245 for Call Control	66
4.6.1	Capability exchange	67
4.6.2	Master/slave determination	67
4.6.3	Opening logical channels	68
4.6.4	Multiplex table entry exchange	68
4.7	Reliable Delivery of H.245 Messages	68
4.7.1	CCSRL	68
4.7.2	SRP and NSRP	69
4.8	End-to-End Call Setup for 3G-324M	71
4.9	Chapter Summary	72
Chapter 5	The H.223 Multiplexer in Detail	73
5.1	Bit and Octet Ordering	73
5.2	Adaptation Layer Formats	74
5.2.1	Adaptation layer type 1	74
5.2.2	Adaptation layer type 2	75
5.2.3	Adaptation layer type 3	75
5.3	Interfacing to the Adaptation Layer	77
5.4	MUX-PDU Formats	78
5.4.1	Mobile level 0	78
5.4.2	Mobile level 1	79
5.4.3	Mobile level 2	80
5.5	Mux Table Entries	81
5.5.1	Specifying MTEs	81
5.5.2	Constructing MUX-PDUs	83
5.5.3	Designing MTEs and building MUX-PDUs	84
5.6	Inputs to the Multiplexer	85
5.6.1	Control	85
5.6.2	Audio	85
5.6.3	Video	86
5.6.4	Data	87
5.7	Chapter Summary	87
Chapter 6	H.245 Command and Control in Detail	89
6.1	H.245 Messages	90
6.2	Terminal Capabilities	92
6.3	Procedures and Signaling Entities	97
6.3.1	Signaling entities	97
6.3.2	The SE user	98
6.4	Description of Procedures	99
6.4.1	Capability exchange	99
6.4.2	Master/slave determination	100
6.4.3	Opening and closing logical channels	102
6.4.4	Multiplex table entry procedures	107
6.4.5	Mode request	109
6.4.6	Round trip delay	110
6.4.7	Maintenance loop	111
6.5	H.245 Commands and Indications	112
6.5.1	Flow control	112
6.5.2	End session	112
6.5.3	Miscellaneous command	112
6.5.4	H.223 multiplex configuration	113
6.5.5	Function not supported indication	113
6.5.6	Miscellaneous indication	114
6.5.7	H.223 logical channel skew	114
6.5.8	Vendor identification	114
6.5.9	User input indication	114
6.6	H.245 Generic Capabilities	115
6.7	Chapter Summary	116
Chapter 7	Session Walkthrough	117
7.1	Phases of the Call	117
7.1.1	Terminal capabilities exchange	118
7.1.2	Master/slave determination	124
7.1.3	Open logical channel (audio)	126
7.1.4	Open bidirectional logical channel (video)	128
7.1.5	Multiplex table entry exchange	132
7.2	Commands and Indications during the Session	135
7.3	Terminating the Session	136
7.4	Chapter Summary	136
Chapter 8	Implementation Issues	139
8.1	Conforming to Standards	139
8.2	Diagnosing Problems	140
8.2.1	Bearer establishment	141
8.2.2	Synchronizing multiplexers	141
8.2.3	MUX-PDUs	141
8.2.4	AL-SDUs	141
8.2.5	H.245 procedures	142
8.2.6	Capability exchange	142
8.2.7	Master/slave determination	142
8.2.8	Exchanging multiplex table entries	143
8.2.9	Opening logical channels	143
8.2.10	Problems with media	144
8.2.11	Other procedures, commands, and indications	144
8.3	Diagnostic and Testing Tools	144
8.4	Design Considerations	145
8.4.1	SE user design	146
8.4.2	Design of 3G-324M components	147
8.5	Implementation Considerations	148
8.6	Chapter Summary	150
Chapter 9	Video Telephony over Mobile Packet Networks	151
9.1	The Session Initiation Protocol	151
9.1.1	SIP messages	152
9.1.2	An example of a call using SIP	154
9.2	The Session Description Protocol	156
9.2.1	The offer/answer model	159
9.3	SIP in 3G Mobile Video Telephony	161
9.4	Chapter Summary	163
Chapter 10	Supplementary Services and Interworking	165
10.1	Interworking between Different Networks	165
10.1.1	Connecting to non-3G-324M multimedia terminals	166
10.1.2	Connecting to speech terminals	166
10.1.3	Multimedia gateways	167
10.2	Supplementary Services	170
10.2.1	Mailbox services	170
10.2.2	Multipoint operation	170
10.3	Supplementary Services and Interworking using Multimedia Gateways	171
10.4	Chapter Summary	173
Appendix A	Syntax of H.245 Messages Used in 3G-324M	175
A.1	Top Level Messages	176
A.2	Master/slave Determination	177
A.3	Capability Exchange Definitions	177
A.3.1	Capability exchange definitions: Top level capability description	178
A.3.2	Capability exchange definitions: Multiplex capabilities	179
A.3.3	Capability exchange definitions: Video capabilities	179
A.3.4	Capability exchange definitions: Audio capabilities	180
A.3.5	Capability exchange definitions: User input	180
A.3.6	Capability exchange definitions: Generic capability	180
A.4	Logical Channel Signaling Definitions	181
A.5	H.223 Multiplex Table Definitions	183
A.6	Request Mode Definitions	184
A.6.1	Request mode definitions: Mode description	184
A.6.2	Request mode definitions: Video modes	186
A.6.3	Request mode definitions: Audio modes	186
A.7	Round Trip Delay Definitions	186
A.8	Maintenance Loop Definitions	187
A.9	Command Messages	187
A.9.1	Command message: Flow control	188
A.9.2	Command message: End session	188
A.9.3	Command message: Miscellaneous commands	188
A.9.4	Command message: H.223 multiplex reconfiguration	188
A.10	Indication Messages	188
A.10.1	Indication message: Function not supported	188
A.10.2	Indication message: Miscellaneous indication	189
A.10.3	Indication message: H.223 logical channel skew	189
A.10.4	Indication message: Vendor identification	189
A.10.5	Indication message: User input	189
A.10.6	Indication message: Flow control	190
Appendix B	H.245 Signaling Entities	191
B.1	Master/Slave Determination Signaling Entity (MSDSE)	192
B.2	Capability Exchange Signaling Entities (CESEs)	196
B.2.1	Outgoing CESE	196
B.2.2	Incoming CESE	198
B.3	Logical Channel Signaling Entities (LCSEs)	200
B.3.1	Outgoing LCSE	200
B.3.2	Incoming LCSE	203
B.4	Bidirectional Logical Channel Signaling Entities (B-LCSEs)	206
B.4.1	Outgoing B-LCSE	206
B.4.2	Incoming B-LCSE	209
B.5	Close Logical Channel Signaling Entities (CLCSEs)	212
B.5.1	Outgoing CLCSE	212
B.5.2	Incoming CLCSE	214
B.6	Multiplex Table Signaling Entities (MTSEs)	216
B.6.1	Outgoing MTSE	216
B.6.2	Incoming MTSE	218
B.7	Request Multiplex Entry Signaling Entities (RMESEs)	220
B.7.1	Outgoing RMESE	220
B.7.2	Incoming RMESE	222
B.8	Mode Request Signaling Entities (MRSEs)	223
B.8.1	Outgoing MRSE	223
B.8.2	Incoming MRSE	225
B.9	Round Trip Delay Signaling Entity (RTDSE)	227
B.10	Maintenance Loop Signaling Entities (MLSEs)	229
B.10.1	Outgoing MLSE	229
B.10.2	Incoming MLSE	231
	Acronyms and Abbreviations	235
	Bibliography	241
	Index	243