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See all Premium member Presentation Transcript WCDMA Core Network Overview : WCDMA Core Network Overview Contents : Page2 Contents Core Network Evolution R99 Core Network R4 Core Network R5 Core Network Definition of Core Network : Page3 Definition of Core Network CN includes a series of physical entities to realize user location management, network function and service control, such as (G)MSC, HLR, SCP, SMC,GSN etc. CN can be divided into three types: Home Network Domain, Transit Network Domain and Service Network Domain. Ref. is 3GPP 23.101. User Equipment Domain Access Network Domain Core Network Domain Infrastructure Domain Cu Mobile Equipment Domain USIM Domain Home Network Domain Transit Network Domain Uu Iu [ Zu] [ Yu] Serving Network Domain Release Evolution of WCDMA : Page4 Release Evolution of WCDMA R4 R5 R99 Inherit all the services and functions of 2G ( GSM and GPRS ) CN is composed of CS domain and PS domain Adopt WCDMA UTRAN Iu interface between RAN and CN is based on ATM Inherit all the services and functions of R99 CS domain change: control is separated from bearer, the function of MSC can be fulfilled by MSC SERVER and MGW. Packet voice supported by CS domain, supporting ATM, IP, TDM bearer Inherit all the services and functions of R4 IM domain is adopted RAN evolved to IP Enhanced IP QoS ability , supporting end to end IP multimedia service 2000 2001 2002 function frozen time Questions : Page5 Questions What functions can CN provide? What is the WCDMA first version? How about the features? Which domain in WCDMA R4 can implement the function of control separated from bearer? Contents : Page6 Contents Core Network Evolution R99 Core Network R4 Core Network R5 Core Network R99 Network Architecture : Page7 R99 Network Architecture R99 Network Architecture : Page8 R99 Network Architecture GSM /GPRS BSS BTS BSC NodeB RNC PCU UTRAN SCP SMS SCE PSTN ISDN Internet, Intranet MSC/VLR GMSC HLR/AUC SGSN CG BG GGSN GPRS骨干网/ RAN CN Other PLMN SS7 R99 Core Network－Features and Technologies : Page9 R99 Core Network－Features and Technologies Core Network is split into CS domain and PS domain. CS domain is based on original GSM network. PS domain is based on original GPRS network. CS domain: used to provide Circuit-switched service. Network mode can support TDM, ATM and IP. Physical entities include switching equipment (such as MSC/VLR, GMSCs), and inter-working equipment (IWF). PS domain: used to provide Packet-switched service. Network mode is IP. Physical entities include SGSN, GGSN, CG , BG etc. R99 Core network－Function Entity(1) : Page10 R99 Core network－Function Entity(1) Function entity shared by CS domain and PS : HLR: to realize mobile subscriber management and location information management ; VLR: to deal with all kinds of data information of current mobile subscriber ; AUC: to store authentication information of mobile subscriber ; EIR: to store IMEI data of mobile subscriber; SMS: Short Message Center. R99 Core network－Function Entity(2) : Page11 R99 Core network－Function Entity(2) Function entity of CS domain: MSC: to realize switching and signaling control function of circuit service. GMSC: to realize addressing function for different network. GMSC and MSC can be integrated together or separated independently. IWF: integrated together with MSC, to realize inter-working with PLMN and ISDN, PSTN , PDN (Mainly complete signaling transfer function), its functions can be defined based on specified services and network types. R99 Core Network－Function Entity(3) : Page12 R99 Core Network－Function Entity(3) Function entity of PS domain: SGSN: to realize packet switching function, signaling control function and route function of packet service. GGSN: to realize inter-working with PS domain and external data network. CG: to realize billing function of packet service. BG: to realize inter-working of two GPRS network and guarantee the security of network. R99 Core Network－Interface(1) : Page13 R99 Core Network－Interface(1) Interface between CN and RAN/BSS: A Interface: to realize mobile station management, base station management, mobility management and call processing, etc. Gb interface: to realize packet data transmit and mobility management. Iu-CS interface: to realize RNS management, mobility management and call control function. Iu-PS interface: its basic function is similar to Iu-CS interface. R99 Core Network－Interface(2) : Page14 R99 Core Network－Interface(2) CS internal interface: B interface (MSC-VLR): A private interface between VLR and MSC. It is used for the MSC to query the current location information of a Mobile Station (MS) from the Visit Location Register (VLR), or request the VLR to update the current location information of the MS or is used for the operations of supplementary services. C interface (MSC-HLR): to get MSRN, the IN service related subscriber status and location information. R99 Core Network－Interface(3) : Page15 R99 Core Network－Interface(3) D interface (VLR-HLR): used to exchange the location information of the MS and the subscriber management information. E interface ( between MSC): to be used for handover process between two MSCs. F interface (MSC-EIR) : to be used for EIR to verify IMEI status information of mobile equipment. G interface (between VLR): to exchange IMSI and authentication information when MS moves from one VLR to another VLR. R99 Core Network－Interface(4) : Page16 R99 Core Network－Interface(4) PS internal interface: Gr interface (SGSN-HLR): to exchange mobile location information and manage subscriber signed information. It is similar to C interface. Gn, Gp interface (SGSN-GGSN): GTP is adopted, used for establish tunnel and transmit data packet between GSN equipment. Gc interface (GGSN-HLR) : optional. Gf interface (SGSN-EIR) . Gi interface (GGSN – external network). Common interfaces shared by CS and PS: Gs interface (MSC/VLR-SGSN): used for combined location update between MSC and SGSN) . H interface (HLR-AUC): used for authentication and ciphering. It is a private interface. Questions : Page17 Questions What’s the functions of R99 core network elements ? Which interfaces do we have in the R99 core network ? Contents : Page18 Contents Core Network Evolution R99 Core Network R4 Core Network R5 Core Network Contents : Page19 Contents 3 R4 Core Network 3.1 Networking and Interface 3.2 R4 Features R4 Network Architecture : Page20 SCP SMS-C GMLC/SMLC HLR/EIR CAP MAP MAP MAP SIGTRAN SS7 UTRAN BSS TDM MGW MGW RTP(AAL2)/AMR IP(ATM) BackBone IP network GSM/R99PLMN PSTN/ISDN VMSC Server RANAP BSSAP AAL2 H.248 MAP BICC GMSC Server TDM/G.711 TDM/G.711 R4 Network Architecture R4 Core Network－Function Entities : Page21 R4 Core Network－Function Entities MSC Server: control layer, to realize MM (mobility management), CM ( call control), MGC (media gate control) . MGW：bearer layer, to realize the exchange of voice and media flow, and provide all kinds sources, such as TC, EC, play announcement and receive DTMF. SG: to realize signaling transfer from MTP (SS7 transmission layer) to SCTP/IP (SIGTRAN transmission layer). R4 Core Network－Interface and Protocol (1) : Page22 R4 Core Network－Interface and Protocol (1) MGW Mc Mc Nb Nc MSC Server MGW GMSC Server R4 Core Network－Interface and Protocol (2) : Page23 R4 Core Network－Interface and Protocol (2) Mc interface ((G)MSC Server–MGW) : H.248 is adopted, to realize the flexible connection processing for multi call mode, multi media； Nc interface (MSC Server–(G)MSC Server) : to realize the inter-office call control. It adopts BICC protocol ； Nb interface ( Between MGWs)：to realize the transfer of control and user information (voice, data, image, media stream) in bearer layer，and realize the transfer of different media frame format. RTP/UDP/IP and AAL2/ATM protocol is adopted. Contents : Page24 Contents 3 R4 Core Network 3.1 Networking and Interface 3.2 R4 Features Bearer and Control Separated : Page25 Bearer and Control Separated MSC Server MGW Control Layer Bearer Layer MSC H.248 Four-layer Architecture : Page26 Four-layer Architecture Service Management Network Control Core Switching Edge Access SoftSwitch 3G Access AMG IAD Broadband Access PSTN TMG SG PLMN Packet Core Network UMG UMG App Server Policy Server iOSS IN SoftSwitch MRS Embedded SG－Save transmission link : Page27 Embedded SG－Save transmission link SCP SMS-C GMLC/SMLC HLR/EIR CAP MAP MAP MAP SS7 network UTRAN BSS TDM MGW MGW RTP(AAL2)/AMR IP(ATM) Backbone IP GSM/R99PLMN PSTN VMSC Server RANAP BSSAP AAL2 H.248 MAP BICC GMSC Server TDM/G.711 TDM/G.711 SG7000 Centralized Service Control : Page28 Centralized Service Control New Service Packet Switch Server MGW MGW MGW MGW MGW MGW MGW Next Generation Network Service is not combined with MGW. Service upgrade only relates to server layer. Centralized service management, easy to upgrade. Traditional Network Service is combined with MSC. Most of services need to upgrade all MSCs. MSCs locates dispersedly, difficult to upgrade. Distributed Architecture－Flexible networking : Page29 Distributed Architecture－Flexible networking Traditional network Inter-working mode. The advantage of distributed networking： Traffic route is the best, network performance is the best. Mostly suitable for the operators with wide coverage. Distributed network inter-working mode. TFO and TrFO – Improve voice quality : Page30 TFO and TrFO – Improve voice quality The difference of TFO and TrFO： TFO set up the coder–free connection by in-band signal, while coder still need to work (used for monitor signal of TFO message) . TrFO set up the coder-free connection by out-band signal, but coder is not needed after connection is set up. The advantage of TFO and TrFO： Improve voice quality： Voice coder has damaged compress for voice. It will reduce voice quality when coder is used. Can reduce the transmission delay. Save the power of equipment When TrFO is adopted, the coder function is bypassed, thus will save the power of equipment. Questions : Page31 Questions What’s the advantage of embedded SG ? What’s the advantage of R4 core network ? What’s the difference between TFO and TrFO ? Contents : Page32 Contents Core Network Evolution R99 Core Network R4 Core Network R5 Core Network Contents : Page33 Contents 4 R5 Core Network 4.1 R5 Networking 4.2 SIP Introduction R5 Network Architecture : Page34 R5 Network Architecture R5 Features : Page35 R5 Features 3GPP R5 Features: Inherit all the WCDMA R4 service and functions. IMS ( IP Multimedia System) is added based on PS, CS of R5 is consistent with that of R4. Iu interface can select IP and ATM. IP based is a trend of networking. IP QoS is enhanced. Services are enhanced, such as OSA，Push Service R5 realizes ALL IP network put forward by 3GPP. IP will become the bearing technology for all signaling message and change the original call flow. R5 Core Network－IMS (1) : Page36 R5 Core Network－IMS (1) IMS main function entity: CSCF： P-CSCF S-CSCF I-CSCF HSS SLF BGCF MGCF/IM MGW MRFC/MRFP AS PDF/PEF R5 Core Network－IMS (2) : Page37 R5 Core Network－IMS (2) CSCF：Call Session Control Function Is divided into P/S/I three types based on its function and location. P-CSCF(Proxy CSCF)：It is the first connection point for subscriber in IMS and provide Proxy function. It can receive service request and transfer them, but can not modify the Request URI field in INVITE message; P-CSCF also can provide user agent function (UA), it can interrupt and independently produce SIP conversion at abnormal case. S-CSCF(Serving CSCF)：S-CSCF is the core control of IMS, it is responsible for UE to register, authenticate and conservation control, realize conservation route function for calling and called IMS user. According to subscriber signed IMS triggered rule, it can trigger the value added service route to AS and control service negotiation. I-CSCF(Interrogating CSCF): similar as IMS gateway node, provide node distribution, route query and IMS Topology Hiding Inter-network function. R5 Core Network－IMS (3) : Page38 R5 Core Network－IMS (3) HSS:The Home Subscriber Server. HSS stores the IMS subscriber signed information, including basic identity, route information and service signed info. Centralized database, located at the top of IMS core network. It stores the following information: IMS subscriber identity (including public and private identity), number and address information. IMS subscriber security context: ciphering information for subscriber to access network for authentication, roaming restrict information. IMS subscriber route information: HSS supported route information, registration information and location information. IMS subscriber service signed information: including other AS value added service data. Contents : Page39 Contents 4 R5 Core Network 4.1 R5 Networking 4.2 SIP Introduction SIP Development : Page40 SIP Development SIP（Session Initiation Protocol）: It is application layer control protocol, used to setup, modify, and terminate multimedia session (including meeting). For example, internet telephone call. Originally derived from MBone experiment in 1996. In 1999, It was adopted as RFC2543 standard by IETF-MMUSIC workgroup. In 1999, SIP work group was established independently, later, two work group named as SIPPING and SIMPLE was newly set up, which is mainly devoted to SIP. In the July of 2002, it is turned to the new standard RFC3261. Most of the content was re-written. It is more clear and precise andsome new features were added. Most of contents keep the backward compliance with RFC2543. SIP Features : Page41 SIP Features Based on text code. Only concern about setup, modify and terminate the conservation. SIP-URL is used to indicate the resources or subscribers needed to be visited. Flexible extended and powerful negotiation mechanism: Supported, Unsupported, Require, Proxy Require, Allow, Accept... Simple networking provides the flexibility, reliability and expandability. Relay equipment (Proxy and Redirector) need not to care about the message content, just transfer transparently. SIP Protocol Stack : Page42 SIP Protocol Stack SIP Application in IMS : Page43 SIP Application in IMS Questions : Page44 Questions What is the difference between R5 and R4? What’s the network element of IMS? What’s SIP feature? Summary : Page45 Summary This course mainly introduces the R99, R4, R5 evolution and each features. The emphasis is R4 network. You do not have the permission to view this presentation. In order to view it, please contact the author of the presentation.
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See all Premium member Presentation Transcript WCDMA Core Network Overview : WCDMA Core Network Overview Contents : Page2 Contents Core Network Evolution R99 Core Network R4 Core Network R5 Core Network Definition of Core Network : Page3 Definition of Core Network CN includes a series of physical entities to realize user location management, network function and service control, such as (G)MSC, HLR, SCP, SMC,GSN etc. CN can be divided into three types: Home Network Domain, Transit Network Domain and Service Network Domain. Ref. is 3GPP 23.101. User Equipment Domain Access Network Domain Core Network Domain Infrastructure Domain Cu Mobile Equipment Domain USIM Domain Home Network Domain Transit Network Domain Uu Iu [ Zu] [ Yu] Serving Network Domain Release Evolution of WCDMA : Page4 Release Evolution of WCDMA R4 R5 R99 Inherit all the services and functions of 2G ( GSM and GPRS ) CN is composed of CS domain and PS domain Adopt WCDMA UTRAN Iu interface between RAN and CN is based on ATM Inherit all the services and functions of R99 CS domain change: control is separated from bearer, the function of MSC can be fulfilled by MSC SERVER and MGW. Packet voice supported by CS domain, supporting ATM, IP, TDM bearer Inherit all the services and functions of R4 IM domain is adopted RAN evolved to IP Enhanced IP QoS ability , supporting end to end IP multimedia service 2000 2001 2002 function frozen time Questions : Page5 Questions What functions can CN provide? What is the WCDMA first version? How about the features? Which domain in WCDMA R4 can implement the function of control separated from bearer? Contents : Page6 Contents Core Network Evolution R99 Core Network R4 Core Network R5 Core Network R99 Network Architecture : Page7 R99 Network Architecture R99 Network Architecture : Page8 R99 Network Architecture GSM /GPRS BSS BTS BSC NodeB RNC PCU UTRAN SCP SMS SCE PSTN ISDN Internet, Intranet MSC/VLR GMSC HLR/AUC SGSN CG BG GGSN GPRS骨干网/ RAN CN Other PLMN SS7 R99 Core Network－Features and Technologies : Page9 R99 Core Network－Features and Technologies Core Network is split into CS domain and PS domain. CS domain is based on original GSM network. PS domain is based on original GPRS network. CS domain: used to provide Circuit-switched service. Network mode can support TDM, ATM and IP. Physical entities include switching equipment (such as MSC/VLR, GMSCs), and inter-working equipment (IWF). PS domain: used to provide Packet-switched service. Network mode is IP. Physical entities include SGSN, GGSN, CG , BG etc. R99 Core network－Function Entity(1) : Page10 R99 Core network－Function Entity(1) Function entity shared by CS domain and PS : HLR: to realize mobile subscriber management and location information management ; VLR: to deal with all kinds of data information of current mobile subscriber ; AUC: to store authentication information of mobile subscriber ; EIR: to store IMEI data of mobile subscriber; SMS: Short Message Center. R99 Core network－Function Entity(2) : Page11 R99 Core network－Function Entity(2) Function entity of CS domain: MSC: to realize switching and signaling control function of circuit service. GMSC: to realize addressing function for different network. GMSC and MSC can be integrated together or separated independently. IWF: integrated together with MSC, to realize inter-working with PLMN and ISDN, PSTN , PDN (Mainly complete signaling transfer function), its functions can be defined based on specified services and network types. R99 Core Network－Function Entity(3) : Page12 R99 Core Network－Function Entity(3) Function entity of PS domain: SGSN: to realize packet switching function, signaling control function and route function of packet service. GGSN: to realize inter-working with PS domain and external data network. CG: to realize billing function of packet service. BG: to realize inter-working of two GPRS network and guarantee the security of network. R99 Core Network－Interface(1) : Page13 R99 Core Network－Interface(1) Interface between CN and RAN/BSS: A Interface: to realize mobile station management, base station management, mobility management and call processing, etc. Gb interface: to realize packet data transmit and mobility management. Iu-CS interface: to realize RNS management, mobility management and call control function. Iu-PS interface: its basic function is similar to Iu-CS interface. R99 Core Network－Interface(2) : Page14 R99 Core Network－Interface(2) CS internal interface: B interface (MSC-VLR): A private interface between VLR and MSC. It is used for the MSC to query the current location information of a Mobile Station (MS) from the Visit Location Register (VLR), or request the VLR to update the current location information of the MS or is used for the operations of supplementary services. C interface (MSC-HLR): to get MSRN, the IN service related subscriber status and location information. R99 Core Network－Interface(3) : Page15 R99 Core Network－Interface(3) D interface (VLR-HLR): used to exchange the location information of the MS and the subscriber management information. E interface ( between MSC): to be used for handover process between two MSCs. F interface (MSC-EIR) : to be used for EIR to verify IMEI status information of mobile equipment. G interface (between VLR): to exchange IMSI and authentication information when MS moves from one VLR to another VLR. R99 Core Network－Interface(4) : Page16 R99 Core Network－Interface(4) PS internal interface: Gr interface (SGSN-HLR): to exchange mobile location information and manage subscriber signed information. It is similar to C interface. Gn, Gp interface (SGSN-GGSN): GTP is adopted, used for establish tunnel and transmit data packet between GSN equipment. Gc interface (GGSN-HLR) : optional. Gf interface (SGSN-EIR) . Gi interface (GGSN – external network). Common interfaces shared by CS and PS: Gs interface (MSC/VLR-SGSN): used for combined location update between MSC and SGSN) . H interface (HLR-AUC): used for authentication and ciphering. It is a private interface. Questions : Page17 Questions What’s the functions of R99 core network elements ? Which interfaces do we have in the R99 core network ? Contents : Page18 Contents Core Network Evolution R99 Core Network R4 Core Network R5 Core Network Contents : Page19 Contents 3 R4 Core Network 3.1 Networking and Interface 3.2 R4 Features R4 Network Architecture : Page20 SCP SMS-C GMLC/SMLC HLR/EIR CAP MAP MAP MAP SIGTRAN SS7 UTRAN BSS TDM MGW MGW RTP(AAL2)/AMR IP(ATM) BackBone IP network GSM/R99PLMN PSTN/ISDN VMSC Server RANAP BSSAP AAL2 H.248 MAP BICC GMSC Server TDM/G.711 TDM/G.711 R4 Network Architecture R4 Core Network－Function Entities : Page21 R4 Core Network－Function Entities MSC Server: control layer, to realize MM (mobility management), CM ( call control), MGC (media gate control) . MGW：bearer layer, to realize the exchange of voice and media flow, and provide all kinds sources, such as TC, EC, play announcement and receive DTMF. SG: to realize signaling transfer from MTP (SS7 transmission layer) to SCTP/IP (SIGTRAN transmission layer). R4 Core Network－Interface and Protocol (1) : Page22 R4 Core Network－Interface and Protocol (1) MGW Mc Mc Nb Nc MSC Server MGW GMSC Server R4 Core Network－Interface and Protocol (2) : Page23 R4 Core Network－Interface and Protocol (2) Mc interface ((G)MSC Server–MGW) : H.248 is adopted, to realize the flexible connection processing for multi call mode, multi media； Nc interface (MSC Server–(G)MSC Server) : to realize the inter-office call control. It adopts BICC protocol ； Nb interface ( Between MGWs)：to realize the transfer of control and user information (voice, data, image, media stream) in bearer layer，and realize the transfer of different media frame format. RTP/UDP/IP and AAL2/ATM protocol is adopted. Contents : Page24 Contents 3 R4 Core Network 3.1 Networking and Interface 3.2 R4 Features Bearer and Control Separated : Page25 Bearer and Control Separated MSC Server MGW Control Layer Bearer Layer MSC H.248 Four-layer Architecture : Page26 Four-layer Architecture Service Management Network Control Core Switching Edge Access SoftSwitch 3G Access AMG IAD Broadband Access PSTN TMG SG PLMN Packet Core Network UMG UMG App Server Policy Server iOSS IN SoftSwitch MRS Embedded SG－Save transmission link : Page27 Embedded SG－Save transmission link SCP SMS-C GMLC/SMLC HLR/EIR CAP MAP MAP MAP SS7 network UTRAN BSS TDM MGW MGW RTP(AAL2)/AMR IP(ATM) Backbone IP GSM/R99PLMN PSTN VMSC Server RANAP BSSAP AAL2 H.248 MAP BICC GMSC Server TDM/G.711 TDM/G.711 SG7000 Centralized Service Control : Page28 Centralized Service Control New Service Packet Switch Server MGW MGW MGW MGW MGW MGW MGW Next Generation Network Service is not combined with MGW. Service upgrade only relates to server layer. Centralized service management, easy to upgrade. Traditional Network Service is combined with MSC. Most of services need to upgrade all MSCs. MSCs locates dispersedly, difficult to upgrade. Distributed Architecture－Flexible networking : Page29 Distributed Architecture－Flexible networking Traditional network Inter-working mode. The advantage of distributed networking： Traffic route is the best, network performance is the best. Mostly suitable for the operators with wide coverage. Distributed network inter-working mode. TFO and TrFO – Improve voice quality : Page30 TFO and TrFO – Improve voice quality The difference of TFO and TrFO： TFO set up the coder–free connection by in-band signal, while coder still need to work (used for monitor signal of TFO message) . TrFO set up the coder-free connection by out-band signal, but coder is not needed after connection is set up. The advantage of TFO and TrFO： Improve voice quality： Voice coder has damaged compress for voice. It will reduce voice quality when coder is used. Can reduce the transmission delay. Save the power of equipment When TrFO is adopted, the coder function is bypassed, thus will save the power of equipment. Questions : Page31 Questions What’s the advantage of embedded SG ? What’s the advantage of R4 core network ? What’s the difference between TFO and TrFO ? Contents : Page32 Contents Core Network Evolution R99 Core Network R4 Core Network R5 Core Network Contents : Page33 Contents 4 R5 Core Network 4.1 R5 Networking 4.2 SIP Introduction R5 Network Architecture : Page34 R5 Network Architecture R5 Features : Page35 R5 Features 3GPP R5 Features: Inherit all the WCDMA R4 service and functions. IMS ( IP Multimedia System) is added based on PS, CS of R5 is consistent with that of R4. Iu interface can select IP and ATM. IP based is a trend of networking. IP QoS is enhanced. Services are enhanced, such as OSA，Push Service R5 realizes ALL IP network put forward by 3GPP. IP will become the bearing technology for all signaling message and change the original call flow. R5 Core Network－IMS (1) : Page36 R5 Core Network－IMS (1) IMS main function entity: CSCF： P-CSCF S-CSCF I-CSCF HSS SLF BGCF MGCF/IM MGW MRFC/MRFP AS PDF/PEF R5 Core Network－IMS (2) : Page37 R5 Core Network－IMS (2) CSCF：Call Session Control Function Is divided into P/S/I three types based on its function and location. P-CSCF(Proxy CSCF)：It is the first connection point for subscriber in IMS and provide Proxy function. It can receive service request and transfer them, but can not modify the Request URI field in INVITE message; P-CSCF also can provide user agent function (UA), it can interrupt and independently produce SIP conversion at abnormal case. S-CSCF(Serving CSCF)：S-CSCF is the core control of IMS, it is responsible for UE to register, authenticate and conservation control, realize conservation route function for calling and called IMS user. According to subscriber signed IMS triggered rule, it can trigger the value added service route to AS and control service negotiation. I-CSCF(Interrogating CSCF): similar as IMS gateway node, provide node distribution, route query and IMS Topology Hiding Inter-network function. R5 Core Network－IMS (3) : Page38 R5 Core Network－IMS (3) HSS:The Home Subscriber Server. HSS stores the IMS subscriber signed information, including basic identity, route information and service signed info. Centralized database, located at the top of IMS core network. It stores the following information: IMS subscriber identity (including public and private identity), number and address information. IMS subscriber security context: ciphering information for subscriber to access network for authentication, roaming restrict information. IMS subscriber route information: HSS supported route information, registration information and location information. IMS subscriber service signed information: including other AS value added service data. Contents : Page39 Contents 4 R5 Core Network 4.1 R5 Networking 4.2 SIP Introduction SIP Development : Page40 SIP Development SIP（Session Initiation Protocol）: It is application layer control protocol, used to setup, modify, and terminate multimedia session (including meeting). For example, internet telephone call. Originally derived from MBone experiment in 1996. In 1999, It was adopted as RFC2543 standard by IETF-MMUSIC workgroup. In 1999, SIP work group was established independently, later, two work group named as SIPPING and SIMPLE was newly set up, which is mainly devoted to SIP. In the July of 2002, it is turned to the new standard RFC3261. Most of the content was re-written. It is more clear and precise andsome new features were added. Most of contents keep the backward compliance with RFC2543. SIP Features : Page41 SIP Features Based on text code. Only concern about setup, modify and terminate the conservation. SIP-URL is used to indicate the resources or subscribers needed to be visited. Flexible extended and powerful negotiation mechanism: Supported, Unsupported, Require, Proxy Require, Allow, Accept... Simple networking provides the flexibility, reliability and expandability. Relay equipment (Proxy and Redirector) need not to care about the message content, just transfer transparently. SIP Protocol Stack : Page42 SIP Protocol Stack SIP Application in IMS : Page43 SIP Application in IMS Questions : Page44 Questions What is the difference between R5 and R4? What’s the network element of IMS? What’s SIP feature? Summary : Page45 Summary This course mainly introduces the R99, R4, R5 evolution and each features. The emphasis is R4 network.