Internal OMQ001101 HUAWEI PCU6000 System Overview ISSUE 2.0 www.huawei.com HUAWEI TECHNOLOGIES CO., LTD All rights reserved  Upon completion of this course, you will be able to:  Understand the PCU structure  Know the PCU Networking topologies  Master the PCU typical configuration HUAWEI TECHNOLOGIES CO., LTD All rights reserved Page References  PCU Technical Manual  PCU Hardware Description Manual HUAWEI TECHNOLOGIES CO., LTD All rights reserved Page Position of PCU Um CCU CCU BSC BTS GSN Gb A PCU Abis CCU BTS PCU CCU CCU BTS GSN BSC Gb GSN BSC C PCU CCU Gb CCU=Channel Codec Unit PCU= Packet Control Unit HUAWEI TECHNOLOGIES CO., LTD B All rights reserved Page Position of Huawei PCU CCU BSC BTS CCU SGSN PCU CCU BTS Gb BSC Pb CCU Abis Um HUAWEI TECHNOLOGIES CO., LTD All rights reserved Page GPRS(BSS side) upgrade to EDGE G E D T E X R R T X upgrade BTS software and hardware - new EDGE TRX HUAWEI TECHNOLOGIES CO., LTD Upgrade BSC software All rights reserved Upgrade PCU software Page PCU Cabinet A PCU cabinet contains three kinds of frames:  Power distribution frame  Power distribution frame − It accommodates a power distribution box that is externally connected to the -48 V power supply LAN switch frame  LAN switch frame − It enables active/standby POMU board communication and remote O&M Dummy Panel  PCU processing frame − The PCU processing frame manages the GPRS service and radio resources PCU processing frame HUAWEI TECHNOLOGIES CO., LTD All rights reserved Page PCU frame board full configuration Front view Back view HUAWEI TECHNOLOGIES CO., LTD All rights reserved Page PCU logical structure SGSN LAN Switch E1 PCU Frame BSC 1+1 RPPU E1 HSC HSC POMU OMC BTS High Speed Data Bus HUAWEI TECHNOLOGIES CO., LTD All rights reserved Page PCU boards  POMU: PCU Operation & Maintenance Unit  BSU: Back Storage Unit  HSC: Hot Swap Controller Board  RPPU: Radio Packet Processing Unit  L2PU: Layer Processing Unit  E1TMb: Back board of the RPPU Board  UPWRb: Power supply Board HUAWEI TECHNOLOGIES CO., LTD All rights reserved Page 10 RPPU  Radio Packet Processing Unit  Completes the functions of the RLC/MAC protocol, the BSS part of Gb interface protocol stack, Pb interface and G-Abis interface processing  Together with other boards, RPPU completes GPRS radio resource management functions  According to the software in the plug-in board, the RPPUs are divided into RPPU (Pb) and RPPU (Gb), which are used on Pb interface and Gb interface separately HUAWEI TECHNOLOGIES CO., LTD All rights reserved Page 13 L2PU  A kind of Layer processing board  Inserted in the RPPU board, used in Pb or Gb interface  Each L2PU supports four standard E1 interfaces  Each RPPU board can hold two L2PU boards, so it can provide standard E1 interfaces at most RPPU board Inter-board communication Protocol processing E1 interface BSC Abnormality processing Operation & maintenance SGSN Indicator L2PU board HUAWEI TECHNOLOGIES CO., LTD All rights reserved Page 14 E1TMb  The back board used together with the RPPU board  Provides the network interface  Provides RPPU with E1 ports Through one DB50 connector E1TMb SGSN/BSC/BTS RPPU E1TM E1 ports processing E1 signal RPPU Debugging Console Front Frame Ethernet interface Back Frame HUAWEI TECHNOLOGIES CO., LTD All rights reserved Page 15 Ethernet signal E1TMb-DIP Switches  The DIP switches are used to configure the type of E1 interface to 75 ohm or 120 ohm  One E1TMb cannot offer the two types at the same time  The default type of E1 interface configuration is 75 ohm HUAWEI TECHNOLOGIES CO., LTD All rights reserved Page 16 Chapter PCU Hardware Structure Chapter PCU Networking Topologies Chapter PCU Capacity & Configuration HUAWEI TECHNOLOGIES CO., LTD All rights reserved Page 17 Interfaces of PCU BTS G-Abis OMC BSC PCU Pb Abis BTS O interface BSC PCU BTS Um SGSN GB BSC  Um interface: interface between MS and BTS  Gb interface: interface between PCU and SGSN  Pb interface: interface between PCU and BSC  G-Abis interface: interface between PCU and BTS  O interface: interface between PCU and OMC HUAWEI TECHNOLOGIES CO., LTD All rights reserved Page 18 Gb interface: Point-to-Point connection PCU Gb SGSN  Case 1:PCU is DTE,SGSN is DCE (defined in GSM 08.16)  Case 2:PCU is DCE,SGSN is DTE (Supported by Huawei PCU) HUAWEI TECHNOLOGIES CO., LTD All rights reserved Page 19 Gb interface: Connection via Frame Relay Network Frame Relay Network PCU SGSN PCU is configured as DTE,SGSN is also configured as DTE HUAWEI TECHNOLOGIES CO., LTD All rights reserved Page 20 PCU topology BSS A Gs PCU MSC/VLR SS7 Gr Gb BSS HLR SGSN GPRS CN GSM BSS HUAWEI TECHNOLOGIES CO., LTD All rights reserved Page 21 PCU topology BSS MSC A PCU Gs FR SS7 Gb BSS Gb Gr HLR SGSN GSM BSS HUAWEI TECHNOLOGIES CO., LTD GPRS CN All rights reserved Page 22 Chapter PCU Hardware Structure Chapter PCU Networking Topologies Chapter PCU Capacity & Configuration HUAWEI TECHNOLOGIES CO., LTD All rights reserved Page 23 POMU, HSC configuration principle  POMU boards work in the 1+1 backup mode  There is only one POMU working at one time  Two POMU are necessary to enhance the reliability of the PCU system  HSC board is configured corresponding to the POMU  The HSC in slot is used with the POMU in slot  The HSC in slot is used with the POMU in slot HUAWEI TECHNOLOGIES CO., LTD All rights reserved Page 24 P H P H O S O S M C M C U U RPPU configuration principle  RPPU work in load-sharing mode  RPPU for Pb interface is configured from board on the left side (maximum boards can be configured)  RPPU for Gb interface is configured from board 15 on the right side (maximum boards can be configured)  In Pb interface, each RPPU supports 120 packet channels activated at the same time; If there are EDGE cells, each RPPU can support 100 PDCH  In Gb interface, each RPPU supports about 8Mbit/s data flow  One RPPU can connect to several BSCs while can not process the data from different BSCs at the same time, so we suggest one BSC be connected to one RPPU separately when the PCU connects to several BSCs HUAWEI TECHNOLOGIES CO., LTD All rights reserved Page 25 Example  Suppose one PCU is required to connect one BSC The BSC supports 900 TRXs, and GPRS packet channels share 10% of all the channels The number of packet channels is 720 (CS-1,CS-2,CS-3,CS-4 supported )  In Pb interface  Minimum number of RPPU = 720/120 =6 pcs  Number of Pb interface E1s for Pb = × =16 pcs  In Gb interface  Suppose the average data rate of one packet channel = 11Kbps  Minimum number of RPPU = 720*11Kbps/(8Mbps*70%) =1.41 ≈ pcs  Number of E1s used for the Gb = × =8 pcs HUAWEI TECHNOLOGIES CO., LTD All rights reserved Page 26 Thank You www.huawei.com ... the PCU structure  Know the PCU Networking topologies  Master the PCU typical configuration HUAWEI TECHNOLOGIES CO., LTD All rights reserved Page References  PCU Technical Manual  PCU Hardware. .. Chapter PCU Hardware Structure Chapter PCU Networking Topologies Chapter PCU Capacity & Configuration HUAWEI TECHNOLOGIES CO., LTD All rights reserved Page 17 Interfaces of PCU BTS G-Abis OMC BSC PCU. .. Page PCU logical structure SGSN LAN Switch E1 PCU Frame BSC 1+1 RPPU E1 HSC HSC POMU OMC BTS High Speed Data Bus HUAWEI TECHNOLOGIES CO., LTD All rights reserved Page PCU boards  POMU: PCU Operation