ARIB STD-T-C.S00-0 Circuit-Switched Video Conferencing Services Refer to "Industrial Property Rights (IPR)" in the preface of ARIB STD-T for Related Industrial Property Rights. Refer to "Notice" in the preface of ARIB STD-T for Copyrights
Original Specification This standard, ARIB-T-C.S00, was prepared by T-WG of Association of Radio Industries and Businesses (ARIB) based upon the GPP specification, C.S00-0 v. Modification to the original specification None. Notes None. 0
GPP C.S00 Version.00 Date: August, 00 Circuit-Switched Video Conferencing Services COPYRIGHT GPP and its Organizational Partners claim copyright in this document and individual Organizational Partners may copyright and issue documents or standards publications in individual Organizational Partner's name based on this document. Requests for reproduction of this document should be directed to the GPP Secretariat at secretariat@gpp.org. Requests to reproduce individual Organizational Partner's documents should be directed to that Organizational Partner. See www.gpp.org for more information.
0 0 0 CONTENTS. Introduction... -.. Scope... -.. References... -.. Abbreviations... -. Overview of Video Conferencing Services... -.. General Descriptions... -.. Structure of the Video Conferencing Service System in the MS... -.. Video Conferencing Service Protocol Stack Reference Model... -. Um Interface Requirements for Establishhing the Video Conferencing Bearer... -.. RLP Requirements... -.. Initialization and Connection of Video Conferencing Service Options... -... Mobile Station Procedures... -... Base Station Procedures... -... Traffic Channel Handoff... -.. Quality of Service (QoS)... -... QoS Parameters... -... Mobile Station Procedures for QoS... -... Base Station Procedures for QoS... -. Video Conferencing Services Multimedia Systems... -.. Multiplex Protocol... -.. Control Protocol... -.. Video Codec... -... Mandatory Video Codecs... -... Optional Video Codecs... -... MPEG- Simple Scalable Profile... -... H. Profile... -... H. Profile... -.. Speech Codec... -. Examples of Call Setup Procedures... -.. Mobile-to-mobile video conference call... -... cdma000 Call Setup Procedure... -... H. Call Setup Procedure... -.. Call between the mobile station and a GPP-M... -... cdma000 and GPP Call Setup Procedure... -... H. Call Setup Procedure... - i
FIGURES Figure - Scope and Structure of Circuit-Switched Video Conferencing Services... - Figure - cdma000 Bearer Call Setup Protocol Stack... - Figure - Video Conferencing Call Setup and Bearer Protocol Stack... - Figure - H. for Video Conferencing Specifications... - Figure - Mobile-to-mobile video conference call... - Figure - Call between the mobile station and a GPP-M terminal... - 0 TABLES Table Valid Service Configuration Attributes for Service Options and... - Table QoS Parameters Applicable to Service Options and... - ii
. INTRODUCTION.. Scope This specification defines the functional characteristics and requirements of the circuitswitched video conferencing services. The service features and system requirements are defined to provide video conferencing services in GPP wireless telecommunications networks... References 0 0 0. A.S000-A Inter-operability Specification (IOS) for cdma000 Access Network Interfaces. C.R00-C ver.0 Administration of Parameter Value Assignments for cdma000 Spread Spectrum Standards. C.S000-C Introduction to cdma000 Standards for Spread Spectrum Systems. C.S000-C Physical Layer Standard for cdma000 Spread Spectrum Systems. C.S000-C Medium Access Control (MAC) Standard for cdma000 Spread Spectrum Systems. C.S000-C Signaling Link Access Control (LAC) Standard for cdma000 Spread Spectrum Systems. C.S000-C Upper Layer (Layer ) Signaling Standard for cdma000 Spread Spectrum Systems. C.S000-C Analog Signaling Standard for cdma000 Spread Spectrum Systems. C.S00-0 Enhanced Variable Rate Codec (EVRC), Speech Service Option for Wideband Spread Spectrum Digital Systems 0. C.S-00-0- Data Service Options for Spread Spectrum Systems. C.S000-0 High Rate Speech Service Option for Wideband Spread Spectrum Communication Systems. C.S000-0 Selectable Mode Vocoder (SMV) Service Option for Wideband Spread Spectrum Communication Systems -
0 0. ISO/IEC - Information Technology - Generic Coding of Audio-Visual Object, March 00. ITU-T Recommendation G.. Dual rate speech coder for multimedia communication transmitting at. &. kbit/s. ITU-T Recommendation G. Coding of Speech at kbit/s using Conjugate - Structure Algebraic- Code- Excited Linear- Prediction (CS- ACELP). ITU-T Recommendation H. Multiplexing protocol for low bitrate multimedia communication. ITU-T Recommendation H. Annex A Multiplexing protocol for low bitrate multimedia communication over low error-prone channels. ITU-T Recommendation H. Annex B Multiplexing protocol for low bitrate multimedia communication over moderate error-prone channels. ITU-T Recommendation H. Control protocol for multimedia communication 0. ITU-T Recommendation H. Video coding for low bitrate communication, November 00. ITU-T Recommendation H. Terminal for low bitrate multimedia communication. TS.0 Adaptive Multi-Rate (AMR) Speech Codec; General Description. TS.0 Codec for Circuit switched Multimedia Telephony Service; General Description (Version.0.0), June 00. TS. Codec for Circuit switched Multimedia Telephony Service; Modifications to H. (version.0.0), June 00 0.. Abbreviations For the purpose of this document, the following abbreviations apply: G Third Generation system GPP Third Generation Partnership Project GPP-M Terminal Mobile Station for GPP Circuit-Switched Video Conferencing compliant with [, ] -
Terminal compliant with [, ] BLOB BS BSAP IOS IOS A IOS A ISUP IWF Mobile Station MS MSC QoS QoS BLOB RC RLP RLP_BLOB BLock Of Bits. Base Station. A fixed station used for communicating with mobile stations. Depending upon the context, the term base station may refer to a cell, a sector within a cell, or other part of the wireless system. Base Station Application Part. The application layer signaling protocol that provides messaging to accomplish the functions of the IOS A Interface component of the MSC-BS Interface. Inter-Operability Specification for interfaces between an MSC and a BS (see []). The IOS interface that carries signaling information between the Call Control (CC) and Mobility Management (MM) functions of the MSC and the call control component of the BS (BSC). The IOS interface that carries / kbps PCM information (voice/data) between the Switch component of the MSC and the Selection/Distribution Unit (SDU) function of the BS (BSC). ISDN User Part Interworking Function. In this document, this refers specifically to the interworking between different speech codecs (e.g., EVRC and GPP-AMR). A station in the Public Cellular Radio Telecommunications Service intended to be used while in motion or during halts at unspecified points. Mobile stations include portable units (e.g., hand-held personal units) and units installed in vehicles. Mobile Station Mobile Switching Center Quality of Service. The set of parameters and procedures associated with a service indicating the capabilities and constraints related to the delivery of the service. The set of QoS parameters exchanged via cdma000 signaling that defines the QoS context for a particular service instance. Radio Configuration. A set of Forward Traffic Channel and Reverse Traffic Channel transmission formats that are characterized by physical layer parameters such as transmission rates, modulation characteristics, and spreading rate. Radio Link Protocol The set of RLP parameters that defines the RLP configuration (e.g., retransmission scheme, round trip time) -
0 0 0. OVERVIEW OF VIDEO CONFERENCING SERVICES.. General Descriptions The document defines point-to-point video conferencing services. Service options and provide video conferencing services capable of transferring multiplex audio, video and control data at speeds of and kbps respectively, over the air-interface (Um) between mobile stations and other terminals. Service options and use the Radio Link Protocol defined in [0] to provide an octet stream transport service over forward and reverse traffic channels. The MSC provides the protocol conversion between cdma000 upper layer signaling and ISUP signaling. Above the Radio Link Protocol, the ITU-T H. [] group of protocols is used for the video conferencing service. ITU-T H. is used for conducting capability exchange and negotiations between the terminals, and for opening and closing of logical channels and other components of the video conferencing servi ces. ITU-T H. [,, ] is used for multiplexing/demultiplexing video, audio and control data. The NSRP and CCSRL protocols defined in Annex C of ITU-T H. are used to transport the H. control messages reliably over the H. multiplex layer. Interoperability with other networks, such as the GPP network, is provided... Structure of the Video Conferencing Service System in the MS The mobile station uses the encoders and decoders, and multiplexer specified in section. Input/output (I/O) interfaces for video, audio, and system control provided in the mobile station are out of scope of this specification. The sending function in the mobile station encodes the data from each media source with the corresponding visual and audio encoder. The output of the encoders and the system control interface are multiplexed and sent to transport layer of the underlying wireless network. The receiving function in the mobile station de -multiplexes the received data stream, and decodes the data with the corresponding video and audio decoders. The output is then sent to be played at local visual and audio players (see Figure ). After the Um interface has been established, control message s defined in [] are used for video conferencing call setup procedures and for controlling other components specified in section. -
Scope of Video Conferencing Visual I/O Audio I/O User Control Interface Visual Encoder/Decoder Audio Encoder/Decoder System Control Interface Multiplexer (Circuit-Switched) Wireless Communication Network Figure - Scope and Structure of Circuit-Switched Video Conferencing Services.. Video Conferencing Service Protocol Stack Reference Model The video conferencing service architecture is defined by the protocols used across the different interface points. Figure - depicts the video conferencing service protocol stack for establishing the required bearer on the cdma000 wireless link. Mobile Station Base Station MSC cdma000 Signaling cdma000 Signaling BSAP BSAP cdma000 Layer and Layer cdma000 Layer and Layer Transport Physical Transport Physical Um A 0 Figure - cdma000 Bearer Call Setup Protocol Stack Figure - depicts the protocol stack for the video conferencing bearer after establishing the cdma000 wireless link. -
Mobile Station H., video, voice Base Station MSC H. frame Rate Adaptation Protocol RLP RLP / kbps PCM / kbps PCM cdma000 cdma000 Physical Physical Um A Figure - Video Conferencing Call Setup and Bearer Protocol Stack 0 The cdma000 Layer, Layer, and signaling protocols between the MS and the BS in Figure - and Figure - are described in [], [], [], [], [], and []. The G IOS A interface is used for signaling information for cdma000 call setup as specified in []. The G IOS A interface is used for H. video conferencing call setup and the video conferencing bearer as specified in []. For the kbps video service, the BS performs rate adaptation between the data stream carried over the RLP transport layer and the / kbps PCM link on the A interface. -
0 0 0. UM INTERFACE REQUIREMENTS FOR ESTABLISHHING THE VIDEO CONFERENCING BEARER The MS and the BS shall support the physical layer, multiplex sublayer, radio link management, and call control protocols as defined in [], [], [], [], [], and []. The H. frames carrying multiplexed H. call control messages, video data, and voice data shall be sent over RLP at a maximum rate of kbps for service option, and at a maximum rate of kbps for service option. The BS shall construct RLP frames carrying a user data rate of or kbps from a single channel of / kbps PCM received from the MSC... RLP Requirements At the U m interface, the MS and the BS shall use Radio Link Protocol Type as defined in [0]. In this specification, Radio Link Protocol Type will be called simply RLP. To control the reliability and delay provided by RLP, the BS uses the RLP_BLOB defined in [0] to send the RLP retransmission scheme to the MS... Initialization and Connection of Video Conferencing Service Options The MS shall support service options and. The BS should support service options and. The MS shall initiate the connection of the video conferencing service by requesting service option or in either a Page Response Message, Origination Message, or an Enhanced Origination Message as defined in []. If the BS receives a Paging Request Message for a video conferencing call from the MSC, the BS shall page the specific MS with the identified video conferencing service option.... Mobile Station Procedures The MS shall connect the video conferencing service using the procedures defined in []. If service negotiation is required the MS shall perform the service negotiation procedures defined in []. The MS shall not propose or accept a service configuration whose attributes are inconsistent with the valid service configuration attribute table for service options and as shown in Table. The default service configuration for video conferencing service options and shall be as shown in Table. -
Table Valid Service Configuration Attributes for Service Options and Service Configuration Attribute Forward FCH/DCCH Multiplex Option Reverse FCH/DCCH Multiplex Option Forward FCH/DCCH Transmission Rates Reverse FCH/DCCH Transmission Rates Forward Traffic Type Reverse Traffic Type Forward FCH/DCCH Radio Configuration Reverse FCH/DCCH Radio Configuration Forward Supplemental Channel Multiplex Option Reverse Supplemental Channel Multiplex Option Forward Supplemental Channel Frame Length Reverse Supplemental Channel Frame Length Forward Supplemental Radio Configuration Reverse Supplemental Radio Configuration Valid Selections 0x 0x For the FCH, Rates, /, /, and / enabled. For the DCCH, Rate enabled, Rates /, /, and / not enabled. For the FCH, Rates, /, /, and / enabled. For the DCCH, Rate enabled, Rates /, /, and / not enabled. Primary or Secondary Primary or Secondary RC,,, RC, 0xf0 0xf0 0 ms 0 ms RC,,, RC, where multiple options are supported the default is in bold... Base Station Procedures The BS shall connect the video conferencing service using the procedures defined in []. If service negotiation is required the BS shall perform the service negotiation procedures defined in []. -
0 0 The BS shall not propose or accept a service configuration whose attributes are inconsistent with the valid service configuration attribute table for service options and as shown in Table. The default service configuration for video conferencing service options and shall be as shown in Table. The BS shall assign Forward and Reverse Supplemental channels to constantly deliver a user data rate of at least or kbps over the Supplemental channel. Variable supplemental channel rate operation below and kbps shall not be allowed for service options and, respectively.... Traffic Channel Handoff Following a CDMA-to-CDMA hard handoff (see []) involving transitions between disjoint sets of BS/MSCs or a frequency change, RLP shall be immediately initialized according to the initialization procedures described in [0]... Quality of Service (QoS)... QoS Parameters The set of QoS parameters that apply to service options and are defined in Table. For each QoS parameter in Table, the set of allowable values that can be selected by service options and are defined. If a parameter value is not specified in Table, it shall be considered reserved and it shall not be used. For service options and, QoS parameters shall be identical for the forward and reverse links. Table QoS Parameters Applicable to Service Options and QoS Parameter SO Allowable Value(s) -
Assured Mode Forward Link Priority Reverse Link Priority Forward Link Minimum User Data Rate Reverse Link Minimum User Data Rate, Assured mode service. This is the default value., The user s priority should not be reduced. kbps. This is the default value. kbps. This is the default value Forward Link Data Loss Rate Reverse Link Data Loss Rate, There are no specific values defined for this parameter. Both the MS and BS should provide appropriate FER for this service. Forward Link Maximum Delay Reverse Link Maximum Delay, There are no specific values de fined for this parameter. Both the mobile station and base station should provide the minimum amount of delay for this service. In Table the data loss rate is the error rate provided above the RLP layer. The maximum de lay is defined as the amount of time user data can be held in the transmit queue (i.e., from the moment it is submitted to RLP for transmission until its actual transmission on a physical channel). 0... Mobile Station Procedures for QoS The MS shall use the default set of QoS parameters as defined in Table for service options and. As there is only one set of default parameters, there is no MS QoS BLOB defined for service options and.... Base Station Procedures for QoS The BS shall use the default set of QoS parameters as defined in Table for service options and. The data loss rate is the error rate provided above the RLP layer. Maximum de lay is defined as the amount of time user data can be held in the transmit queue (i.e., from the moment it is submitted to RLP for transmission until its actual transmission on a physical channel). -
As there is only one set of default parameters, there is no BS QoS BLOB defined for service options and. -
. VIDEO CONFERENCING SERVICES MULTIMEDIA SYSTEMS ITU-T H. recommendation with Annex C shall be used for the GPP circuitswitched video conferencing service. For the rest of this section H. refers to ITU-T H. with Annex C. Video I/O Equipment Video Codec Audio I/O Equipment Speech Codec Optional Receive Path Delay Multiplex/ Demultiplex GPP Network Control Protocol CCSRL NSRP System Control Call Set-Up Figure - H. for Video Conferencing Specifications 0.. Multiplex Protocol The MS shall support ITU-T H. with both Annexes A [] and B [] in order to multiplex and demultiplex video, audio, and control message s. The MS may support other annexes in H.... Control Protocol The MS shall support version of ITU-T H. as the control protocol for capabilities exchange, master/slave determination, opening and closing of logical channels, and transmission of other control messages. The MS may support newer versions of ITU-T H.. -
0 0.. Video Codec... Mandatory Video Codecs The MS shall support MPEG- Simple Profile Level 0 [] and H. baseline [0] video codecs.... Optional Video Codecs... MPEG- Simple Scalable Profile The MS should support the MPEG- Visual codec with Simple Scalable Profile, Level 0 [].... H. Profile The MS should support profile for the H. video codec [0], which includes the following annexes: Annex I Advanced Intraframe Coding; Annex J Deblocking Filter; Annex K Slice Structure Mode, without RS and ASO submodes; Annex T Modified Quantizer.... H. Profile The MS should support profile for the H. video codec [0], which includes the following annexes in addition to the annexes in profile : Annex V Data Partitioned Slice Mode; Annex W (subclause W..) - Previous Picture Header Repetition... Speech Codec No mandatory speech codec is required for the mobile station. The mobile station should support k (PureVoice) QCELP [], AMR [], EVRC [], and SMV [] speech codecs. Other speech codecs may also be supported. The MS can decode and generate bit streams that are compliant with MPEG- Simple Profile Level 0 and H. baseline. -
0 0. EXAMPLES OF CALL SETUP PROCEDURES The video conferencing call setup procedure is divided into two phases: the cdma000 call setup and the H. call setup. cdma000 call setup is first performed using the procedures defined in [], [], [], [], [], and [] to establish the bearer for the H. protocols. The service option field within the Origination Message is set to service option or defined in []. When the MSC receives the CM Service Request Message with a video conferencing service option, the MSC sends an ISUP message corresponding to the service option to the MSC of the mobile station being called. The BS sends a Paging Message with that service option to the mobile station. After the cdma000 call setup procedures have established the H. bearer, the negotiation, control, and multiplexing procedures defined in ITU-T Recommendation H./H. are performed. If codec conversion is not needed, both terminals exchange H./H. message s directly with each other. If codec conversion (such as between EVRC and GPP-AMR) is needed, each terminal exchanges H./H. message s with the gateway function performing the conversion... Mobile-to-mobile video conference call Figure - illustrates an example call where both terminals are GPP mobile stations that select a kbps video call. -
MS Base Station MSC MSC Base Station MS Origination Message (SO = ) Channel Assignment Message Complete L Info: CM Service Request (SO = ) Assignment Request IAM ( kbps, H./H.) Paging Request (SO = ) Page Message (SO = ) Service Connect Completion Assignment Complete Compete L Info: Paging Response (SO = ) Page Response Message (SO = ) ACM Assigment Request Channel Assignment Message Assignment Complete Service Connect Completion Alert with Info Connect Order Connect ANM Connect Connect Order H. frames exchanged over kbps UDI channel ( kbps over the air) H. Control MPEG- Video EVRC Speech Figure - Mobile-to-mobile video conference call -
0... cdma000 Call Setup Procedure The mobile station sends an Origination Message requesting service option. The MSC generates an ISUP parameter requesting k bandwidth and H./H., and sends it to the MSC of the mobile station being called. The called mobile station responds to the Paging Message with service option.... H. Call Setup Procedure After the cdma000 call setup procedure, the negotiation, control and multiplex messages defined in [] are exchanged between the two mobile stations... Call between the mobile station and a GPP-M Figure - illustrates an example call made from a GPP mobile station to a GPP- M terminal. -
MS Base Station MSC IWF GPP MSC GPP-M Terminal Origination (SO = ) Channel Assignment Message Complete L Info: CM Service Request (SO = ) Assignment Request IAM ( kbps, H./H.) IAM ( kbps, H./H.) 0.0 Setup ( kbps, H./H.) Service Connect Completion Assignment Complete ACM ACM Call Confirmed Alerting Connect ANM ANM Connect Connect Order GPP Network Procedures H. frames exchanged over kbps UDI channel ( kbps over the air) H. Control H. Control MPEG- Video MPEG- Video EVRC Speech GPP-AMR Speech Figure - Call between the mobile station and a GPP-M terminal -
0... cdma000 and GPP Call Setup Procedure The mobile station sends an Origination Message requesting service option. The MSC generates an ISUP parameter requesting kbps bandwidth and H./H., and sends it to the MSC of the GPP-M terminal being called. The MSC of the called terminal sends a Setup message for the kbps service to the GPP-M terminal, which responds.... H. Call Setup Procedure After the cdma000 and GPP call setup procedures, both terminals exchange the negotiation and control message s defined in [] with the IWF. In this example, the IWF negotiates different video and speech codecs for the two terminals. The IWF performs the necessary conversion between the EVRC and GPP-AMR speech formats. -