01 mc will v6 architecture&system functions (by zhao xiaojun)

Editor's Notes

• #2: Good morning, everybody. In next few hours, I’m glad to share McWiLL V6 with you, we are going to talk about architecture and system functions, also we will talk about service flow.
• #3: First, let’s have a look at the goals. I think, after this class, we shall be clear about these points: 1, What NEW functions we can get from V6. 2, How to construct a V6 network. What devices or products will be used? 3, We’d get to know all the core network products, SAG, SMC, Billing, NMS, Dispatch client, etc. 4, We’d get clear about the capability of McWiLL trunking system, for example, latency time of ready to speak and start to speak, simultaneous group calls, etc. 5, How does the services work? Group call, call insert, call drop, priority call, late entry, Dynamic Group Number Assignment, etc.
• #4: There are some abbreviations should be known. SAG means service aggregation gateway, DNSS means Distributed Network Support System iM means integrated Management system, iMC means integrated Message Centre CB means Convergent Billing DCS means Dispatch Control System STBC means SCDMA Terminal Burning Centre
• #5: We got five items for this class, all-in-one solutions, core network products, system functions, service flow, and I’d like to introduce the developing road mark of McWiLL in next few years. Now let’s see them one by one.
• #6: We got two core network product series, so there are two all-in-one solutions, one is based on SAG2000, voice service, or trunking service is provided by the third party soft switch, Cameroon network is such a network. and the other one is based on SAG3000, SAG3000 provides voice and trunking services.
• #7: This figure shows the components of solution. Dispatch&switch product provides the basic telecom service, supplementary telecom service and dispatch service. The three blue blocks, dispatch&switch product, base station product and terminal product are the foundation of the all-in-one solutions. They provide channels for high level services or value-added services, for example, mobile payment, mobile charging. And, OSS system is necessary, OSS provides the man-machine interface of operating and maintenance, it is composed by core network management system and wireless network management system. Sometimes end to end security is needed, security mechanism can be embedded in the whole solutions, the same as OSS, security mechanism is concerned with every elements.
• #8: This figure shows the solution based on SAG3000. The network can be split into three layers: Access layer, including all kinds of terminals. In mobile scenes, handsets will be used, some handset support trunking and some not. Some handsets have intelligent operating system, for example Windows CE, Windows mobile, and some Linux core based systems, as a personal digital assistant, these terminals could be used to handle some transactions. In portable scenes, USB-card should be used, for example U28. In fixed scenes, CPE and super CPE should be used. Concentration layer, including base stations ,SAG, HLR and short message centre. These devices concentrate the channels of all the terminals in the network. All the channels will be classified to four kind of service channels, broadband data, dispatch voice, telecom voice, and short message. Core layer is over the concentration layer. All high level services is deployed in this layer, for example, internet or other applications, dispatch, internet short message service, and voice. SAG3000 supports interworking with NGN via SIP. If we need interwork with PSTN, ISUP over E1 is also supported. Via ISMG, that is internet short message gateway, McWiLL user can send message to or receive message from other network, for example, GSM. Via SMPP, iMC2000 communicates with ISMG. Now let’s talk about the interface between dispatch server and dispatch client, commonly, this interface should be private, we have encapsulated the interface protocol into an API library, all the signaling processing and media processing are encapsulated into this library, customers can call the functions of the library to develop the dispatch client, to develop different graphic user interface, customers could care no signaling or media processing. SQ, SN, SD1, SE1, SAbisP interface?
• #9: This figure shows the solution based on SAG2000. The access layer is exactly same as the SAG3000 based network. The differences to SAG3000 based network are soft switch, SAG and HLR, here, we use SAG2000 or SAG1000, SHLR3000 and the soft switch or dispatch system to construct the network. The soft switch or dispatch system are provided by the third party. The key is, dispatch system works with SAG2000 or SAG1000 must be based on soft switch. If dispatch service is needed in Cameroon, additional device we need is only one MDS.
• #10: Now let’s talk about the core network products.
• #11: As we just talked, We got two series products, SAG3000 based and SAG2000 based. Some products could be used in the two solutions, such as DNSS3000, iM3000, SMC and STBC3000. DNSS3000 is the wireless network management system, it manages the base station and SAG2000 or SAG1000. iM3000 is the core network management system, it manages the HLR3000, SHLR3000, iMC2000 and CB3000. iMC2000 is the short message centre, and iMC2000 can work as short message gateway. STBC3000 is the terminal burning centre, there is no STBC in Cameroon, XINWEI’s Chongqing factory does the burning job for Cameroon. HLR3000 and SHLR3000 are subscriber database and authentication centre. When terminal power on, it must register to the HLR, authentication is embed in the course of registration. SAG3000 can be considered equivalent to SAG2000 plus soft switch with dispatch function. DCS1000 only works with SAG3000. DCS1000 is composed of server and client. DCS1000 Server works as a prepositive machine(前置机？) of SAG3000. DCS1000 client provides the man-machine interface for dispatcher. CB3000 only works with SAG3000 too. Now, let’s go to see details of these products.
• #12: SAG3000 has two frames, one is 14U and the other is 4U. This picture shows the SAG3000 based on 14U frame. SAG3000 supports HEV voice, switch, mobility management and user management, especially, it supports trunking service. SAG3000 is composed of three kinds of board, TSP, NSP and EPI. TSP is used to process voice media and trunking service, NSP executes service aggregation, that is to transfer RTP to SRTP or SRTP to RTP. Up to 2 TSP can be plug in 1 SAG3000, the 2 TSP work on HA (high availability) mode. The capacity of two TSP working on HA mode is equal to one TSP. TSP and NSP are mandatory for SAG3000, but EPI is not. EPI is interface board, if E1 interface to PSTN is needed, EPI should be configured. One EPI supports 16 E1, up to 2 EPI can be plug in 1 SAG3000, the 2 EPI work on load sharing mode. EPI supports ISUP and R2 mix mode. So, SAG3000 supports 3 kinds of interface to PSTN, they are SIP over IP, ISUP over E1 and R2 over E1. The capacity of one TSP is 20,000, according to traffic of one user is 0.03Erland. One TSP can supports up to 768 concurrent calls, in the condition of 2 media boards plug and codec is G.729. If codec is G.711, the number will be 512. If only one media board is plug, then the number will be half. 1 SAG3000 manages 128 base stations. One 14U frame has 10 slots available, so it supports up to 5 SAG3000 units, one unit is formed by 1 TSP and 1NSP. If HA is needed, one unit will be formed by 2 TSP and 1 NSP, then number of units will be up to 3.
• #13: This slide shows the panels of three boards. First, TSP board, TSP is used to process voice media and trunking service. FE interface is for signaling, and media flow is transported through GE interface. NSP board, NSP executes service aggregation, that is to transfer RTP to SRTP or SRTP to RTP. FE interface is for maintenance, GE interface is for signaling and media flow. EPI board, EPI is interface board, if E1 interface to PSTN is needed, EPI should be configured. FE interface is for maintenance, DB100 connector is provided to connect with E1 link.
• #14: This is another form of SAG3000. Compared with 14U frame, the differences are size and power, because of reduced size, only one SAG3000 unit can be supported, and power is down.
• #15: This slide shows SAG2000. Compared with SAG3000, there is no TSP board, and then switch is not supported. Switch should be provided by the third party’s device, for example, soft switch of Nsoft. For trunking service, XINWEI has developed the interface protocol between SAG2000 and MDS. MDS is third-party dispatch system. SAG2000 supports trunking service with MDS. SAG2000 is composed of only one kind of board, that is NSP, NSP executes service aggregation, that means SAG2000 works as SIP agent of mobile terminals, and transfers RTP to SRTP or SRTP to RTP. SRTP is defined for transmitting and receiving G.729 packets between base station and SAG2000. In ten milliseconds, all voice packets of all users in one base station should be MUX and encapsulated into a SRTP packet, the packet is transmitted to receiver, receiver should DEMUX and de-capsulates the packet. The capacity of one NSP is 30,000, according to traffic of one user is 0.03Erland. One NSP can supports up to 1,000 concurrent calls. 1 SAG2000 manages 128 base stations. One 14U frame has 10 slots available, so it supports up to 10 SAG2000 units, one unit is formed by 1 NSP.
• #16: In traditional VoIP packet, overhead is too much. Every ten milliseconds, a 10 bytes G.729 packet is generated, to transfer the 10 bytes, we must spend at least 64 bytes. Most band is wasted. To save air interface resource, we replace the big head of traditional VoIP packet with McWiLL air interface head. HEV technology transfers only G.729 voice packet over air interface, the bandwidth is only 8kbps. Base station encapsulate number of users’ voice packets into one SRTP packet per 10ms and send it to SAG. SAG transfer SRTP to RTP, and send it to third-party soft switch.
• #17: SAG1000 is software edition of SAG2000, it runs on general purpose server, IBM xseries 3650 is recommended. The functions SAG1000 supports are same to SAG2000, but the capacity is less than SAG2000. SAG1000 supports 96 concurrent calls, according to traffic of one user is 0.03Erland, the capacity of SAG1000 is 3,000. One SAG1000 manages 32 base stations.
• #18: HLR3000 works with SAG3000, and SHLR3000 works with SAG2000 or SAG1000. The functions of HLR3000 and SHLR3000 are approximate, they manage subscribes information, for example telephone number, bandwidth, group information and VLAN group ID etc. HLR is also the authentication centre of McWiLL network. When one terminal powers on, before the user can dial or access internet, the terminal must register to the HLR first, authentication is embed in the course of registration.
• #19: DNSS3000 is the wireless network management system, it manages the base station, SAG2000 and SAG1000. The element EMS has been converged into DNSS3000, it works as a module of DNSS3000 now.
• #20: One of difference between V6 and V5 is subscribing for voice service and data service. In V5, data service subscribing is done in EMS, and voice service is subscribed in SHLR3000. In V6, the two service are all subscribed in SHLR3000. And the other difference is V6 supports dispatch service.
• #21: iM3000 is the core network management system, it manages the HLR3000, SHLR3000, iMC2000 and CB3000.
• #22: The same as SMC of GSM or CDMA, iMC2000 supports the interface to Internet Short Message Gateway, SMPP is used, and Version 3.4 is recommended. The capacity of iMC2000 is up to 1 million, message in queue is up to half million. Based on IBM xseries 3650, the message processing speed should be up to 500 per second. And if based on PC with some configuration, the speed should be 300 per second. Time latency of message searching is less than 2000 milliseconds with 95% probability. Probability of message lost is ten negative seventh power. Time latency of message transmitting is less than 1000 milliseconds with 95% probability. Time latency of message transmitting means the interval between SMC accepting one message to it first trying sending out.
• #23: CB3000 is a billing system supporting voice, short message and broadband data service billing. It is researched and developed by XINWEI independently. Differentiated from traditional broadband data billing systems, CB3000 collects billing data directly from the base station, not dependent on BRAS and AAA servers, this will be helpful for saving the cost of network deployment for operators. Current version of CB3000 supports: 1.Convergent billing for voice, SMS and broadband data service. 2.Prepaid and postpaid based on online billing, the billing is real time. 3.Web self-services, customer can recharge through internet. 4.Recharge card production and management. 5.Capacity of 20,000 New features are developing for CB3000, follow-up version will support: 1.Roaming billing between several CB3000, CB3000 will support distributed network. 2.Simplified business operation 3.Union recharge card management
• #24: Differentiated from traditional broadband data billing systems, CB3000 collects billing data directly from the base station, not dependent on BRAS and AAA servers, this will be helpful for saving the cost of network deployment for operators.
• #25: DCS1000 only works with SAG3000. DCS1000 is composed of server and client. DCS1000 Server works as a prepositive machine of SAG3000. DCS1000 client provides the man-machine interface for dispatcher. Current version of DCS1000 supports group management, group call, broadcast call, call inserted and dropped by dispatcher, call monitored by dispatcher, data group call, VRPN, etc. That’s all for core network products.
• #26: This part is for system functions of McWiLL V6.
• #27: It is a summary. McWiLL Multimedia Trunking System is provided with: Voice trunking and data trunking service along with broadband data service Performance of voice trunking and data trunking is equivalent to TETRA, iDEN Based on ability of broadband wireless access, supporting multimedia information transmission, including voice, images, real time video, etc.
• #28: McWiLL V6 supports fundamental trunking services and supplemental trunking services. The fundamental services are individual call and group call. The other services listed are all supplemental service. These functions can meet nearly all customer’s requirements.
• #29: The capability of McWiLL trunking service includes three items: Number of concurrent group calls that one base station supports. One base station supports 20 concurrent group calls and 40 concurrent individual calls. Or one base station supports 20 concurrent group calls along with throughput of 5Mbps for packet data service. Time latency of Ready to speak, that is time needed by a group call setup. It is less than 500 milliseconds. Time latency of Start to speak, that is time from user press PTT button to he is granted to speak. It is less than 200 milliseconds. If we reduce the coverage radius of base station, we can reduce the power of downlink share channel, then the concurrent group calls can be up to 50.
• #30: This table shows the capability of McWiLL and TETRA. It is clear that McWiLL has advantages in all capabilities.
• #31: Now we shall see that how do the services work.
• #32: First, let’s see group call. Group call may be originated by dispatcher or handset. Dispatcher operates dispatch client, selects one group from the list, and click group call button, then the signaling is sent to DCS server, and then SAG3000, SAG3000 will allocate the resource for the group call and inform the base stations. Base stations will page the group members. At the same time, the downlink share channels for this group call are setup, figured by the red circles, the share channels are omni-directional, not formed. As any group member receives the paging message, it will go to channels assigned and listen.
• #33: This slide shows the group call originated by dispatch handset. The originator select a group from the list of handset, and push PTT button, then a signaling of group call setup is sent to SAG3000, SAG3000 will allocate the resource for the group call and inform the base stations. Base station will page the group members. At the same time, the downlink share channels for this group call are setup. As any group member receives the paging message, it will go to channels assigned and listen. Similar to voice user, also group member roaming is supported.
• #34: This slide shows dynamic channel assignment. When a group call setup by SAG3000, SAG3000 knows in which base stations are serving for group members, and which base stations are not. The base stations that have no members will not allocate channels for this group call. But when any member of the group moves into the cell, the station will allocate the channel for the call immediately. In this way we can save the air interface resource, and more groups can be supported.
• #36: Late entry is designed for the members not power on or not in service. Group call paging message is broadcasted by some period, When these members get into the service again, they can received the paging message and entry the group call.
• #37: This figure shows the scene that one member waiting for speaking. When a group call was setup, and 1003 is speaking, this time, if 1004 press the PTT button, that means he will apply for speaking. But 1004’s level is lower than 1003, so the system, SAG3000 will not grants 1004’s request, 1004 has to wait until 1003 release PTT.
• #38: But if the member that push to talk is 1002, the thing will be different. Because 1002’s level is higher than 1003, the system will grant 1002’s request immediately. Then 1003’s speaking will be cut, and 1002 should speak.
• #39: This slide is for short message service. In Cameroon, iMC2000 is connected to Nsoft SMC, they communicate via SMPP. All the short message billing are performed in Nsoft SMSC, iMC2000 only transmits MO SMS to Nsoft SMSC, and delivers MT SMS (from Nsoft SMSC) to McWiLL terminals. iMC2000 forwards all MO short messages to Nsoft SMSC. Nsoft SMSC transmits the short message to called number, that is the MT short message: If the short messages is sent to a McWiLL user, perform step ②. and If the short messages is sent to other PLMN, perform step ③. and If the short messages is sent to CP/SP, perform step ④.
• #40: CB3000 performs CDR collecting, billing and sending out online instructions. CDR of voice is generated by SAG3000, short message CDR is generated by iMC2000, broadband data service CDR is generated by base stations. SAG3000, iMC2000 and base stations will send CDRs to specified FTP server by some period. When CB3000 find someone’s account is insufficient, it will send a online instruction to HLR3000 to make the user service suspending. Customer can access the self-service web server to recharge.
• #41: Part five is for McWiLL developing road mark.
• #42: The development of McWiLL is sustainable. For McWiLL technology, the cycle of technical evolution or revolution is about two years. From 2008 to 2010, over V5, we developed multimedia trunking for V6. Next cycle will be from now to 2012, the target is V7, the key features will be: Better spectrum efficiency, from 3bps/Hz to 5bps/Hz; MIMO will be put into McWiLL; McWiLL would support uniform dispatch of voice, data and video, that is the goal of next generation of public emergency. McWiLL mobile station would support DMO, that means Direct Mode Operation, it allows mobile stations connect with each other without base stations. Last one, we will optimize the air interface to make McWiLL supporting high speed of 350Km/h, then McWiLL could be used in high-speed railway.
• #43: At last, we’d get a review for this class.
• #44: First, we got two all-in-one solutions, SAG3000 based and SAG2000 based. Second, we got to know all our core network products, three SAG, 3000, 2000 and 1000, 3000 can work as switch but 2000 and 1000 are only aggregation gateway. Two HLRs, they are both authentication centre and subscriber database. HLR3000 is for SAG3000, SHLR3000 is for SAG2000 and SAG1000. iMC2000 is short message centre, it can also work as gateway. DCS1000 is a dispatch client. CB3000 works only with McWiLL system, it can’t bill for other switchs, at least for now. DNSS3000 and iM3000 are wireless and core network management system. In next practice class, Liuyuanchang will show you the operation details. Also we talked about system functions and service flow, group call, DGNA, call priority, late entry, short message and billing, etc. And at last we know what McWiLL would be in 2012. That’s all for the class, now, any questions?