logging in or signing up GBC_007_E1_0 GSM signaling system for UET faiqa786 Download Post to : URL : Related Presentations : Share Add to Flag Embed Email Send to Blogs and Networks Add to Channel Uploaded from authorPOINT lite Insert YouTube videos in PowerPont slides with aS Desktop Copy embed code: (To copy code, click on the text box) Embed: URL: Thumbnail: WordPress Embed Customize Embed The presentation is successfully added In Your Favorites. Views: 233 Category: Science & Tech.. License: All Rights Reserved Like it (1) Dislike it (0) Added: August 27, 2010 This Presentation is Public Favorites: 0 Presentation Description No description available. Comments Posting comment... By: teofen (9 month(s) ago) nice presentation there, need to download this please Saving..... Post Reply Close Saving..... Edit Comment Close By: satyasunil (19 month(s) ago) Request you to please allow to download this presentation. Saving..... Post Reply Close Saving..... Edit Comment Close Premium member Presentation Transcript GBC_007_E1_0 GSM Signaling System : GBC_007_E1_0 GSM Signaling System ZTE University GSM-BSS D&T Team Slide 2: At the end of this course, you will be able to: Understand the Basic of SS7 Know GSM system signaling model State various types of GSM protocol messages Understand GSM system basic signaling procedure Objectives Slide 3: No.7 Common Channel Signaling Slide 4: Signaling It is the dialog language for the communication between various parts of the telecom network. It ensures the network to operate normally as an integer. 1. Basic conception Slide 5: Common channel signaling Channel associated signaling Transmission path： 1. Basic conception Slide 6: Common Channel Signaling System 1. Basic conception Slide 7: Exchange A Register Exchange B Line terminal Line terminal v+s v+s v+s v+s v+s v+s Subscriber Line Signaling Channel associated signaling Register 1. Basic conception Slide 8: Um MSC/VLR HLR/AUC MSC/VLR SMC MAP C D MAP MAP E PLMN PSTN ISDN PSPDN TUP ISUP OMC－S Network Management Center Q3 TCP/IP X. 25 BSC BTS BTS BSSAP A Abis TUP ISUP 2. NO.7 Signaling Overview Slide 9: SCCP MTP3（network layer） MTP2（Data link layer） MTP1（Physical layer） TUP ISUP DUP User part Message transfer part 2.2 Signaling System No. 7 Hierarchy Traditional: 2. NO.7 Signaling Overview Slide 10: The relation between OSI and SS7 2. NO.7 Signaling Overview Slide 11: The first level defines the physical, electrical, and functional features of the signaling data link, and is thus similar to the OSI physical layer. It determines the connection method with the data link, and provides an information carrier for the signaling link. In digital transmission, signaling data links are usually digital channels at 64kbit/s. 1) Signaling Data Link Layer (MTP1) 2.3 MTP (Message Transfer Part) 2. NO.7 Signaling Overview Slide 12: The second level defines the signaling message transmission functions and procedure related to its transfer on a signaling data link. The second level and the first signaling data link used as a whole as an information carrier, provide a signaling link between two signaling points for the reliable transfer of messages. 2) Signaling Link Function Level (MTP2) 2. NO.7 Signaling Overview Slide 13: 3) Signaling network function level(MTP3) 2. NO.7 Signaling Overview MTP3 is level 3 function in signaling system No.7. In principle, it defines the function and procedure of information transfer in the signaling network, and it is shared by all signaling links. Slide 14: ①message routing: selecting the signaling link that is used by each signaling message to be transmitted; ②message distribution: send the message to a user part or level-3 functions after receiving the message; ③message authentication: to determine whether a signaling point is the destination point of a message after the signaling point receives the message; ④signaling service management: control message routing etc; ⑤signaling link management: control the locally connected link Group; ⑥signaling route management. 2. NO.7 Signaling Overview MTP3 functions cover the following aspects: Slide 15: The user part is the fourth function level of the NO.7 signaling system. Its main function is to control the setup and release of various basic calls. The major user parts include the telephone user part (TUP), the ISDN user part (ISUP) and the signaling connection control part (SCCP). 4) The user part (the 4th level) 2. NO.7 Signaling Overview Slide 16: 2. NO.7 Signaling Overview Slide 17: CCSN: Common Channel Signaling Network In common channel signaling systems, the signals and voice signals are separately transmitted, so a dedicated common channel signaling network can be composed. CCSN is Data Communication Network. 3. C C S N Slide 18: 3.1 Composition of the Signaling Network 1)Signaling point (SP) Refers to the node in the signaling system that provides common channel signaling. Each SP have a signaling point code (SPC). SPC is divided into 2 types: OPC: Originating Point Code DPC: Destination Point Code OPC or DPC is 14-bit address for CCITT (24-bit for China) 2)Signaling transfer point (STP) It refers to SP that transfer signaling messages from one signaling link to another. They are neither source points, nor destination points. That is, they are the middle node points during signaling transfer. 3)Signaling link (SL) 3. C C S N Slide 19: B Voice channels A Signaling Link C SP A SP B STP 2_2_2 3_3_3 8_8_5 3. C C S N Slide 20: OPC or DPC is not absolute. OPC and DPC are relative, the OPC of certain Office, for other Offices, is DPC. For example, the SP of switch A is 2_2_2, and SP of switch B is 3_3_3. If you work in switch A then 2_2_2 is OPC for A, and 3_3_3 is DPC for A. If other work in switch B, then 3_3_3 is OPC for B, and 2_2_2 is DPC for B. 2_2_2 3_3_3 3. C C S N Slide 21: 1)Associated working mode The information between two signaling points are transmitted via a signaling link that directly connects the two signaling points. 3. C C S N 3.2 Working mode of the signaling network Slide 22: 3. C C S N 2) Non-associated working mode The signaling message is transferred via several signaling links based on the current network status. At different time, the signaling message route passes uncertain paths. This mode is no longer used as there are too many data of the signaling point to be configured. Slide 23: 3. C C S N 3) Quasi-associated working mode The message of a certain signaling relation will pass one or several signaling points for transfer during transmission, but the path of the message that passes the signaling network is pre-established and fixed. Quasi-associated mode is a special case of non-associated mode. Slide 24: 3. C C S N 3.3 Signaling Routing Normal route 2) Alternate route Slide 25: Signaling link It refers to the signaling message channel that connects an SP and another SP (or STP). Signaling link set A bunch of signaling links directly connecting two SP (including STP) form one signaling link set. Signaling ROUTE One such set usually includes all parallel signaling links. Signaling Office ID It is also possible to set several routes between two SP. LINK LINK SET ROUTE OFFICE ID 3. C C S N Slide 26: 3. C C S N GSM Interface : GSM Interface GSM system signaling model GSM System Signaling Model : GSM system signaling model adopts the lowest three layer of OSI seven layer protocol model, from low to high: GSM System Signaling Model GSM system signaling model Physical Layer : The physical layer provides error protection transmission. It defines the electric parameters of transmission. In ZTE-GSM digital mobile communication systems, The physical layer of Um interface between MS and BTS is Radio link. Abis interface physical layer adopts 75-ohm coaxial cable or 120-ohm symmetrical twisted pair whose rate is 2Mbit/s. Physical Layer GSM system signaling model Data Link Layer : Data Link Layer The data link layer major functions: frame transmission、error-free transmission and realize end-to-end bits transfer between two connective entities. Open、 maintenance and close the connection of two connective entities. The link layer protocol used by the GSM system at the radio interface is the LAPDm protocol (Dm channel link access procedure). The data link layer of Abis interface between BTS and BSC is LAPD (D channel link access procedure). GSM system signaling model Application Layer : Application Layer GSM system signaling model Application Layer : Radio Resources (RR) management handles the establishment, maintenance and release of physical channels. Its major functions are performed by BSC. Part of functions are performed by BTS. Mobility Management (MM) deals with the mobile station’s register and the identify of the mobile subscriber, The function are performed by MSC. The CM Layer is composed of three functional entities: Call Control (CC), deals with the functions to establish、maintenance and release the call；Short Message Service support (SMS) and Supplementary Service support (SS). Application Layer GSM system signaling model GSM protocol : Public Switched Telephone Network (PSTN) MAP/TCAP + ISUP/TUP To other VLR ISUP/TUP DTAP + BSSMAP MAP/TCAP MAP/TCAP MAP/TCAP BTSM A-bis interface A interface GSM protocol GSM system signaling model GSM Protocol Architecture : DTAP DTAP Direct Transfer Application Part BSSMAP BSS Management Application Part CM Call Management MM Mobile Management RR Radio Resource Management SCCP Signalling Connection Control Part MAP Mobile Application Part TCAP Transaction Capability Application Part ISUP ISDN User Part MTP Message Transfer Part CM MM RR Sig. layer 2 Layer 1 (air) Sig. layer 2 Sig. layer 1 MTP SCCP BSSMAP RR (CM+MM) MS BSC MTP MTP SCCP SCCP CM MM BSSMAP TCAP MAP I S U P MSC Sig. layer 2 Layer 1 (air) BTS (CM) (MM) (RR) (CM) (MM) (RR) (CM) (MM) (LAPDm) (LAPDm) (LAPD) Sig. layer 2 Sig. layer 1 (LAPD) BTSM BTSM RR' BTSM BTS Management Um Interface Abis Interface A Interface Inter-MSC Interface GSM Protocol Architecture GSM system signaling model Content : Content GSM System Signaling Model GSM protocol message Basic Signaling Procedure Um interface protocol stack : Um interface protocol stack GSM protocol messages LAPDm frame format : LAPDm frame format The address field contains the service access point identifier (SAPI). SAPI = 0 represents the signaling link SAPI = 3 represents the short message link In the control field, N (S) represents the sending serial number N (R) represents the receiving serial number GSM protocol messages Operation mode : Operation mode Acknowledged mode: Requires the confirmation from the receiver. This mode provides a whole set of control mechanism for error recovering and flow control, the establishment mechanism and release mechanism for multi-frame operations. Unacknowledged mode: The receiver is not required to send a confirmation upon reception of a UI frame. This operation mode does not provide flow control or error recovering mechanism. GSM protocol messages RR messages : RR messages GSM protocol messages MM messages : MM messages GSM protocol messages CC messages : CC messages GSM protocol messages Abis Interface Protocol stack : Abis Interface Protocol stack GSM protocol messages LAPD Protocol : LAPD Protocol SAPI = 0 represents the signaling link, SAPI = 62 represents the O&M link, and SAPI = 63 represents the management link of the LapD layer. GSM protocol messages A interface protocol stack : A interface protocol stack GSM protocol messages Relationship between SCCP and OSI model : Relationship between SCCP and OSI model GSM protocol messages BSSAP : BSSAP GSM protocol messages You do not have the permission to view this presentation. In order to view it, please contact the author of the presentation.
GBC_007_E1_0 GSM signaling system for UET faiqa786 Download Post to : URL : Related Presentations : Share Add to Flag Embed Email Send to Blogs and Networks Add to Channel Uploaded from authorPOINT lite Insert YouTube videos in PowerPont slides with aS Desktop Copy embed code: (To copy code, click on the text box) Embed: URL: Thumbnail: WordPress Embed Customize Embed The presentation is successfully added In Your Favorites. Views: 233 Category: Science & Tech.. License: All Rights Reserved Like it (1) Dislike it (0) Added: August 27, 2010 This Presentation is Public Favorites: 0 Presentation Description No description available. Comments Posting comment... By: teofen (9 month(s) ago) nice presentation there, need to download this please Saving..... Post Reply Close Saving..... Edit Comment Close By: satyasunil (19 month(s) ago) Request you to please allow to download this presentation. Saving..... Post Reply Close Saving..... Edit Comment Close Premium member Presentation Transcript GBC_007_E1_0 GSM Signaling System : GBC_007_E1_0 GSM Signaling System ZTE University GSM-BSS D&T Team Slide 2: At the end of this course, you will be able to: Understand the Basic of SS7 Know GSM system signaling model State various types of GSM protocol messages Understand GSM system basic signaling procedure Objectives Slide 3: No.7 Common Channel Signaling Slide 4: Signaling It is the dialog language for the communication between various parts of the telecom network. It ensures the network to operate normally as an integer. 1. Basic conception Slide 5: Common channel signaling Channel associated signaling Transmission path： 1. Basic conception Slide 6: Common Channel Signaling System 1. Basic conception Slide 7: Exchange A Register Exchange B Line terminal Line terminal v+s v+s v+s v+s v+s v+s Subscriber Line Signaling Channel associated signaling Register 1. Basic conception Slide 8: Um MSC/VLR HLR/AUC MSC/VLR SMC MAP C D MAP MAP E PLMN PSTN ISDN PSPDN TUP ISUP OMC－S Network Management Center Q3 TCP/IP X. 25 BSC BTS BTS BSSAP A Abis TUP ISUP 2. NO.7 Signaling Overview Slide 9: SCCP MTP3（network layer） MTP2（Data link layer） MTP1（Physical layer） TUP ISUP DUP User part Message transfer part 2.2 Signaling System No. 7 Hierarchy Traditional: 2. NO.7 Signaling Overview Slide 10: The relation between OSI and SS7 2. NO.7 Signaling Overview Slide 11: The first level defines the physical, electrical, and functional features of the signaling data link, and is thus similar to the OSI physical layer. It determines the connection method with the data link, and provides an information carrier for the signaling link. In digital transmission, signaling data links are usually digital channels at 64kbit/s. 1) Signaling Data Link Layer (MTP1) 2.3 MTP (Message Transfer Part) 2. NO.7 Signaling Overview Slide 12: The second level defines the signaling message transmission functions and procedure related to its transfer on a signaling data link. The second level and the first signaling data link used as a whole as an information carrier, provide a signaling link between two signaling points for the reliable transfer of messages. 2) Signaling Link Function Level (MTP2) 2. NO.7 Signaling Overview Slide 13: 3) Signaling network function level(MTP3) 2. NO.7 Signaling Overview MTP3 is level 3 function in signaling system No.7. In principle, it defines the function and procedure of information transfer in the signaling network, and it is shared by all signaling links. Slide 14: ①message routing: selecting the signaling link that is used by each signaling message to be transmitted; ②message distribution: send the message to a user part or level-3 functions after receiving the message; ③message authentication: to determine whether a signaling point is the destination point of a message after the signaling point receives the message; ④signaling service management: control message routing etc; ⑤signaling link management: control the locally connected link Group; ⑥signaling route management. 2. NO.7 Signaling Overview MTP3 functions cover the following aspects: Slide 15: The user part is the fourth function level of the NO.7 signaling system. Its main function is to control the setup and release of various basic calls. The major user parts include the telephone user part (TUP), the ISDN user part (ISUP) and the signaling connection control part (SCCP). 4) The user part (the 4th level) 2. NO.7 Signaling Overview Slide 16: 2. NO.7 Signaling Overview Slide 17: CCSN: Common Channel Signaling Network In common channel signaling systems, the signals and voice signals are separately transmitted, so a dedicated common channel signaling network can be composed. CCSN is Data Communication Network. 3. C C S N Slide 18: 3.1 Composition of the Signaling Network 1)Signaling point (SP) Refers to the node in the signaling system that provides common channel signaling. Each SP have a signaling point code (SPC). SPC is divided into 2 types: OPC: Originating Point Code DPC: Destination Point Code OPC or DPC is 14-bit address for CCITT (24-bit for China) 2)Signaling transfer point (STP) It refers to SP that transfer signaling messages from one signaling link to another. They are neither source points, nor destination points. That is, they are the middle node points during signaling transfer. 3)Signaling link (SL) 3. C C S N Slide 19: B Voice channels A Signaling Link C SP A SP B STP 2_2_2 3_3_3 8_8_5 3. C C S N Slide 20: OPC or DPC is not absolute. OPC and DPC are relative, the OPC of certain Office, for other Offices, is DPC. For example, the SP of switch A is 2_2_2, and SP of switch B is 3_3_3. If you work in switch A then 2_2_2 is OPC for A, and 3_3_3 is DPC for A. If other work in switch B, then 3_3_3 is OPC for B, and 2_2_2 is DPC for B. 2_2_2 3_3_3 3. C C S N Slide 21: 1)Associated working mode The information between two signaling points are transmitted via a signaling link that directly connects the two signaling points. 3. C C S N 3.2 Working mode of the signaling network Slide 22: 3. C C S N 2) Non-associated working mode The signaling message is transferred via several signaling links based on the current network status. At different time, the signaling message route passes uncertain paths. This mode is no longer used as there are too many data of the signaling point to be configured. Slide 23: 3. C C S N 3) Quasi-associated working mode The message of a certain signaling relation will pass one or several signaling points for transfer during transmission, but the path of the message that passes the signaling network is pre-established and fixed. Quasi-associated mode is a special case of non-associated mode. Slide 24: 3. C C S N 3.3 Signaling Routing Normal route 2) Alternate route Slide 25: Signaling link It refers to the signaling message channel that connects an SP and another SP (or STP). Signaling link set A bunch of signaling links directly connecting two SP (including STP) form one signaling link set. Signaling ROUTE One such set usually includes all parallel signaling links. Signaling Office ID It is also possible to set several routes between two SP. LINK LINK SET ROUTE OFFICE ID 3. C C S N Slide 26: 3. C C S N GSM Interface : GSM Interface GSM system signaling model GSM System Signaling Model : GSM system signaling model adopts the lowest three layer of OSI seven layer protocol model, from low to high: GSM System Signaling Model GSM system signaling model Physical Layer : The physical layer provides error protection transmission. It defines the electric parameters of transmission. In ZTE-GSM digital mobile communication systems, The physical layer of Um interface between MS and BTS is Radio link. Abis interface physical layer adopts 75-ohm coaxial cable or 120-ohm symmetrical twisted pair whose rate is 2Mbit/s. Physical Layer GSM system signaling model Data Link Layer : Data Link Layer The data link layer major functions: frame transmission、error-free transmission and realize end-to-end bits transfer between two connective entities. Open、 maintenance and close the connection of two connective entities. The link layer protocol used by the GSM system at the radio interface is the LAPDm protocol (Dm channel link access procedure). The data link layer of Abis interface between BTS and BSC is LAPD (D channel link access procedure). GSM system signaling model Application Layer : Application Layer GSM system signaling model Application Layer : Radio Resources (RR) management handles the establishment, maintenance and release of physical channels. Its major functions are performed by BSC. Part of functions are performed by BTS. Mobility Management (MM) deals with the mobile station’s register and the identify of the mobile subscriber, The function are performed by MSC. The CM Layer is composed of three functional entities: Call Control (CC), deals with the functions to establish、maintenance and release the call；Short Message Service support (SMS) and Supplementary Service support (SS). Application Layer GSM system signaling model GSM protocol : Public Switched Telephone Network (PSTN) MAP/TCAP + ISUP/TUP To other VLR ISUP/TUP DTAP + BSSMAP MAP/TCAP MAP/TCAP MAP/TCAP BTSM A-bis interface A interface GSM protocol GSM system signaling model GSM Protocol Architecture : DTAP DTAP Direct Transfer Application Part BSSMAP BSS Management Application Part CM Call Management MM Mobile Management RR Radio Resource Management SCCP Signalling Connection Control Part MAP Mobile Application Part TCAP Transaction Capability Application Part ISUP ISDN User Part MTP Message Transfer Part CM MM RR Sig. layer 2 Layer 1 (air) Sig. layer 2 Sig. layer 1 MTP SCCP BSSMAP RR (CM+MM) MS BSC MTP MTP SCCP SCCP CM MM BSSMAP TCAP MAP I S U P MSC Sig. layer 2 Layer 1 (air) BTS (CM) (MM) (RR) (CM) (MM) (RR) (CM) (MM) (LAPDm) (LAPDm) (LAPD) Sig. layer 2 Sig. layer 1 (LAPD) BTSM BTSM RR' BTSM BTS Management Um Interface Abis Interface A Interface Inter-MSC Interface GSM Protocol Architecture GSM system signaling model Content : Content GSM System Signaling Model GSM protocol message Basic Signaling Procedure Um interface protocol stack : Um interface protocol stack GSM protocol messages LAPDm frame format : LAPDm frame format The address field contains the service access point identifier (SAPI). SAPI = 0 represents the signaling link SAPI = 3 represents the short message link In the control field, N (S) represents the sending serial number N (R) represents the receiving serial number GSM protocol messages Operation mode : Operation mode Acknowledged mode: Requires the confirmation from the receiver. This mode provides a whole set of control mechanism for error recovering and flow control, the establishment mechanism and release mechanism for multi-frame operations. Unacknowledged mode: The receiver is not required to send a confirmation upon reception of a UI frame. This operation mode does not provide flow control or error recovering mechanism. GSM protocol messages RR messages : RR messages GSM protocol messages MM messages : MM messages GSM protocol messages CC messages : CC messages GSM protocol messages Abis Interface Protocol stack : Abis Interface Protocol stack GSM protocol messages LAPD Protocol : LAPD Protocol SAPI = 0 represents the signaling link, SAPI = 62 represents the O&M link, and SAPI = 63 represents the management link of the LapD layer. GSM protocol messages A interface protocol stack : A interface protocol stack GSM protocol messages Relationship between SCCP and OSI model : Relationship between SCCP and OSI model GSM protocol messages BSSAP : BSSAP GSM protocol messages