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RG10(BSS) for Network Planners

RG10(BSS) for Network Planners. Customer training material. RG10 for Network Planners. Site Solution Hardware Support Flexi BSC(3i 3000) and Double Capacity AS7 Unit_ BSS21149 Integrated IP card for BSC3i and TCSM3i_ BSS21157 PCU2 HW Evolution and Asymmetrical PCU HW configuration_ BSS21226

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RG10(BSS) for Network Planners

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  1. RG10(BSS) for Network Planners Customer training material

  2. RG10 for Network Planners Site Solution Hardware Support • Flexi BSC(3i 3000) and Double Capacity AS7 Unit_BSS21149 • Integrated IP card for BSC3i andTCSM3i_BSS21157 • PCU2 HW Evolution and Asymmetrical PCU HW configuration_BSS21226 Radio Network Performance • AMR Handover Signaling Optimization_BSS20916 • Unpacking AMR_BSS21120 • Wideband AMR_BSS20960 • Tandem Free Operation (TFO) for AMR_BSS21118 • SDCCH and PS Data Channels on DFCA TRX_BSS21161 • Downlink Dual Carrier_BSS21228 Improvement in Operability • Energy Saving Mode For BCCH TRX_BSS20958 • Flexi EDGE Dual TRX Automatic Power Down_BSS20984

  3. Site Solution Hardware Support • Flexi BSC and Double Capacity AS7 Unit • Benefits • Architecture • Configuration steps • PCU capacity • Dimensioning rules (BSC, BCSU, PCU, ET)

  4. Site Solution Hardware Support Flexi BSC PDFU PDFU GSW2KB GTIC ETC ETC CLS GSW2KB GTIC ETC ETC CLS FTRB FTRB BCSU 7 MCMU MCMU OMU BCSU 1 BCSU 2 BCSU 3 LANU FTRB FTRB BCSU 4 BCSU 5 BCSU 6 LANU Flexi BSC benefits Flexi BSC reduces OPEX • Circuit-switched capacity for voice 18000 Erlangs • Packet data capacity for EDGE evolution up to 30720 Abis links (16kbit/s) • 3000 TRXs and 3000 BTS sectors/sites in one cabinet • Scalable in 6 HW capacity steps (BCSUs) from 500 TRX to 3000 TRX, license step one TRX • New support of IP/Ethernet for all interfaces • Flexible transmission types (E1/T1, STM-1/OC-3, IP/Ethernet) • Very high footprint efficiency • Excellent power consumption efficiency

  5. Site Solution Hardware Support • Base Station Controlling and Signalling Unit (BCSU) • Handling of signalling traffic (LAPD, SS7) incl. PCU Exchange Terminal (ET) • Connecting of transmission systems (E1/T1, STM1/OC3, PWE3) to GSWB; several ET types are possible within Flexi BSC: ET16, ETS2, ETIP • Bit-oriented Group Switch (GSWB) • Switching CS/PS traffic, connecting signalling circuits • Clock and Synchronization Unit (CLS) • Generating clock signals for BSC3i Flexi BSC architecture • Marker and Cellular Management Unit (MCMU) • Supervising of GSWB, executing RRM functions, internal traffic handling by Ethernet Message Bus (EMB) and LAN Switching Units (SWUs) • Operation and Maintenance Unit (OMU) • Supporting O&M for Flexi BSC incl. storage devices (interfaces to user/OMC/transmission/peripherals, alarm collection and indications, system configuration/management, BSC3i maintenance/administration, LAN topology management)

  6. Site Solution Hardware Support Flexi BSC Configuration Steps • Overview on Flexi BSC capacity • The following table presents the main capacity figures of the Flexi BSC #TRX per BSC 1…500 501…1000 1001…1500 1501…2000 2001…2500 2501…3000 #active BCSU 1 2 3 4 5 6 max #BTS / #BCF 500 1000 1500 2000 2500 3000 max #logical PCU2-E 5 10 15 20 25 30 max #PS Abis chan@16 5120 10240 15360 20480 25600 30720 max #RTSL 4000 8000 12000 16000 20000 24000 0 8 4 2 2 1 2 0 16 8 4 4 2 4 0 16 12 6 6 3 6 0 16 16 8 8 4 8 0 16 16 10 10 5 10 0 16 16 12 12 6 12 max #SS7 links: 64 kbps 128 kbps 256 kbps 512 kbps 1024 kbps HSL max #LAPD (*1) 992 1984 2976 3968 4960 5952 #PCM (*2): ET16 SET ETIP 50 16 8 50 16 8 50 16 8 50 16 8 50 16 8 50 16 8 (*1): #LAPD links achievable with “low capacity” SS7 links. Therefore in 3000 TRX conf. SS7 over IP (SIGTRAN) is recommended. (*2): #controllable PCM lines does not depend on #BCSU

  7. Site Solution Hardware Support PCU capacity in Flexi BSC • PCU functionality in Flexi BSC can be realized by both: • PCU2-E, a new plug in unit offering significant capacity enhancements • PCU2-D, • The following PCU configurations are feasible in Flexi BSC : • Each BCSU can be equipped with up to 5 PCU • BCSU can have a mixture of PCU2-D/PCU2-E • With Asymmetric PCU configuration feature all BCSUs within one BSC do not need identical PCU configurations • PCU2-D comprises 2 logical PCU, each logical PCU can handle up to 256 Abis PS channels@16 • PCU2-E comprises 1 logical PCU, it can handle up to 1024 Abis PS channels@16.

  8. Site Solution Hardware Support DimensioningFlexi BSC • Dimensioning concept same as with BSC3i: • All static and dynamic limits are checked against the corresponding values determined per planning area • The basic formula is used to calculate the number of BSCs in a given area • The initial BSC utilization level is considered to leave capacity for future extensions and traffic growth • Flexi BSC offers high scalability and configuration variety: • In a given BSC the following items are calculated • The number required of BCSUs • The number of required PCUs • The number and types of the interface units/ports

  9. Site Solution Hardware Support DimensioningBCSU • Working BCSU is needed for each 500 TRXs • Every BCSU is equipped with the number of AS7-D units sufficient to handle signalling traffic produced by 500 TRX • Also other units (power supply, CPU, memory) are always installed and do not need to be computed • Apart from this, BCSU can be equipped with up to 5 PCUs • The number of working BCSU per Flexi BSC can be computed by formula below: • Regardless of the amount of working BCSU an extra spare one is always needed for redundancy • N+1 redundancy principle applies for the BCSUs

  10. Site Solution Hardware Support DimensioningPCU2-E • PCU2-E has several static limits (#Abis channels, #TRX, #BTS, #segments, #EDAPs, …) (For details about PCU2-E static limits please refer to product documentation) • Usually the most critical parameter in PCU dimensioning is the number of Abis channels that can be managed by PCU • PCU2-E serves 1024 Abis channels@16 kbps • PCU2-D serves 256 Abis channels@16 kbps • The number of PCU can be computed by means of the formula below:

  11. The number of Exchange Terminals (of given type) depend on how many PCM lines is terminated in Flexi BSC and what connectivity configuration has been chosen The number of PCM lines can be computed by means of the formula below: The next step is to decide which PCM lines will be connected to ET16, ETS2 and ETIP and to compute the required amount of PIU and cartridges to be installed Site Solution Hardware Support DimensioningET

  12. Site Solution Hardware Support DimensioningET • Then the number of particular PIU can be computed as follows (ETSI standard): • Please note that the actual number of ETS2 PIU depends on the number of required SET and number of optical interfaces activated per ETS2 (1 or 2 optical interfaces may be active): • 1 optical interface per ETS2 active: • 2 optical interfaces per ETS2 active:

  13. Integrated IP card for BSC3i and TCSM3i • Integrated IP card for BSC3i and TCSM3i • Benefits • Hardware Requirements • Functionality • Planning and dimensioning aspect

  14. Integrated IP card for BSC3i and TCSM3i Integrated IP card for BSC3i and TCSM3iBenefits • Ethernet based transmission networks are cheaper that E1/T1 networks comparing the same bandwidths • At the same time, more and more transport resources are expected to be needed due to: • Availability of services which leads to increase in data rates and in the amount of transport resources • Collaboration on the same site base station operating in different technologies (e.g. GERAN, UTRAN ) • Exchange Terminal for IP (ETIP) is fully integrated with the existing HW platform • ETIP (ETIP1-A) is designed in such a way that allows to be used instead of ETS2 or ET16, • Extends BSC3i/TCSM3i products flexibility and gives operator many new configuration possibilities • Any mixture of all S14 compatible Exchange Terminals is fully allowed • All these reasons cause that IP over Ethernet BSS interfaces are supposed to be the most efficient realization of transport network in GERAN

  15. Integrated IP card for BSC3i and TCSM3i Integrated IP card for BSC3i and TCSM3i ETIP1-A plug in unit ETIP1-A characteristics • 8+8 ETIP can be installed in Flexi BSC • 8+8 ETIP can be installed in BSC3i 1000/2000 • 4+4 ETIP can be installed in TCSM3i (stand-alone) • 126 E1 / 168 T1 per ETIP1-A (in BSC3i) • 128 E1/T1 per ETIP1-A (in TCSM3i) • 512 different WS (Pseudo Wires) • 512 different PSN tunnels • Fast Ethernet / Gigabit Ethernet external connectors • FastE: mainly to be used for local O&M interface • GigE: mainly to be used for PSN interface

  16. Integrated IP card for BSC3i and TCSM3i Integrated IP card for BSC3i and TCSM3i Functionality • TDM links can be replaced by IP over Ethernet links • Mapping of TDM traffic into IP packets possible thanks to PWE3 (Pseudo Wire Emulation) • PWE3 is a standardized mechanism which emulates the essential attributes of a service into Packet Switched Network (PSN). • Different services can be emulated by PWE3 with CESoPSN functionality (i.e.PWE3 of TDM traffic ) • IP solution is applicable for Flexi BSC, BSC3i, TCSM3i and FlexiEDGE BTS products • PWE for other elements can be implemented by additional products e.g. hiD3105/3140HD.

  17. Integrated IP card for BSC3i and TCSM3i an E1 line a resulting PW (also called CESoPSN packet) • 3 TDM frames mapped • PW composed of 31 TS TDM frame #1 TDM frame #2 CESoPSN Header … … … … TS31 Ch24 Ch24 TS31 Ch2 TS1 TS2 Ch2 TS1 TS0 Ch1 Ch1 TDM frame #3 payload header … … … … TS31 Ch24 Ch24 TS31 Ch2 TS2 TS1 Ch2 TS0 Ch1 TS1 Ch1 Ref. P. Spennemann, Internal Ethernet/IP Interfaces for BSSFeature Request Sheet, FRS 94060, version 2.0, May 2007 TSS composed of 31 TS … … … … Ch24 TS31 Ch24 TS31 TS1 Ch2 Ch2 TS2 Ch1 Ch1 TS1 TS0 Integrated IP card for BSC3i and TCSM3i PWE3 realization in BSS: CESoPSN • CESoPSN functionality • Circuit Emulation Service over PSN performs the following activities: • The TDM bit stream is segmented according to the user specified Time Slot Set (TSS) • bits transmitted by indicated PCM TS in subsequent TDM frames • Headers are added to each segment to form a manageable packet (encapsulation) • Packets are forwarded to the PSN tunnel and transmitted to its destination over Ethernet network • At destination, the original bit stream is reconstructed by removing headers, concatenating frames and regenerating the timing

  18. Integrated IP card for BSC3i and TCSM3i Integrated IP card for BSC3i and TCSM3i Planning and dimensioning aspects • Number of ETIP are needed to map the desired TDM traffic into a PSN using Ethernet links with chosen bandwidth (FE vs. GE) . The following dimensioning aspects are: • Decide/choose which particular lines shall be mapped to a PSN • Define PWs (from TSS) for each PCM line to be mapped to a PSN • Define how many TDM frames shall be multiplexed within particular CESoPSN packets • Compute a bandwidth required by each and every PW • Compute the number of required ETIP1-A • BSC3i can have mixture of traditional TDM lines (ET16, ETS2) and PW lines (ETIP)

  19. Integrated IP card for BSC3i and TCSM3i TDM frame (E1) 32 timeslots 125 µ s Timeslot allocated for Abis TSx TS2 TS2 TS28 TS28 TS29 TS29 TS30 TS30 TS8 TS8 TS9 TS9 TS10 TS10 TS11 TS11 TS12 TS12 TS13 TS13 TS21 TS21 TS23 TS23 TS24 TS24 TS25 TS25 TS26 TS26 TS27 TS27 TS31 TS31 TS0 TS0 TS4 TS4 TS5 TS5 TS6 TS6 TS7 TS7 TS14 TS14 TS15 TS15 TS16 TS16 TS17 TS17 TS18 TS18 TS19 TS19 TS20 TS20 TS1 TS1 TS2 TS2 TS3 TS3 Timeslot unused TSx TS0 TS1 TS2 TS4 TS5 TS6 TS29 TS0 TS1 TS2 TS3 TS4 TS5 TS6 TS0 TS4 TS5 TS3 TS30 TS31 TS29 TS30 TS31 TS1 TS2 TS3 TS4 TS5 TS6 TS0 TS1 TS2 TS3 TS31 TS29 TS30 TS31 TS4 TS5 TS6 TS29 TS1 TS2 TS3 TS30 TS29 TS30 TS31 TS0 bundle 1 - 29 bundle 1 - 29 bundle 1 - 29 bundle 1 - 29 (CESoPSN) (CESoPSN) (CESoPSN) TS4 TS5 TS6 TS3 TS4 TS5 TS6 TS1 TS2 TS3 TS4 TS5 TS6 TS1 TS3 TS29 TS1 TS2 TS29 TS29 TS2 TS3 TS2 TS4 TS5 TS6 TS1 TS29 multiplier = 2 (CESoPSN) Packet TS6 TS5 TS1 TS2 TS3 TS4 TS5 TS6 TS1 TS2 TS3 TS4 TS29 TS29 Header Packet TS5 TS6 TS29 TS4 TS1 TS2 TS3 TS4 TS5 TS1 TS2 TS3 TS6 TS29 Header 2 frames multiplexed, packetization time of 2*125μs = 250 μs Integrated IP card for BSC3i and TCSM3i Planning and dimensioning aspects Parameters • The number of consecutive TDM frames per CESoPSN packet (Nf) • The time slot set i.e. the number of TSL from the original E1/T1 (TSS) • Use of VLAN (CESoPSN header 74 octets with VLAN and 70 octets without VLAN) Required Ethernet bandwidth: Illustration:

  20. Integrated IP card for BSC3i and TCSM3i Planning and dimensioning aspectsDimensioningaspects • Calculation example • Given: • 126 E1 lines to be mapped • 1 PW per E1 line (each TSS composed of 31 TSs) • 8 TDM frames per packet • CESoPSN header length of 74 bytes (VLAN is enabled) • Gigabit Ethernet and Fast Ethernet links shall be checked • Calculations: • packetization latency = 125 · Nf = 1000 μs (cf. eq. 2) => will be needed for time budget • payload = 8 * TSS * Nf = 1984 bits (cf. eq. 2) => 248 bytes; payload size acceptable • header = 8 * header_length = 592 bits (cf. eq. 2) • BW / PW = (1984 + 592) / 1000 = 2.576 Mbit/s (cf. eq. 1) • OHF = (1984 + 592) / 1984 = 1.29  29% (cf. eq. 4) • BW / PSN = 2.576 * 126 = 324.58 Mbit/s (cf. eq. 7) • GE link load = 324.58 / 1000 = 32.5% => all 126 E1 can be served by 1 ETIP • FE link load = 324.58 / 100 = 324.6 % => not possible!!! • With FE, 5 ETIP would be needed to handle 126 E1 • 126 E1 can be handled by 1 ETS2 (with 2 optical interfaces)

  21. Integrated IP card for BSC3i and TCSM3i Ref. P. Koski, M. Saukko, H. Tervonen, J. Toivinen, PWE Transport Support in BSC3i and TCSM3i, Requirements Specification, BSS21157, version 1.1.0, January 2008 Planning and dimensioning aspectsImpact on implementation planning • TCSM aspects • Stand-alone TCSM3i has the following characteristics • Comprises of 1…6 TC2C cartridges in a single Transcoder Cabinet • Each TC2C houses 2 TR3E/TR3A PIUs • One TC2C cartridge can house two extension steps • One TC2C cartridge consist of up to 16 TR3E/TR3A units each up to 120 channels plus selected interface cards • Each TR3x has the following transcoding capacity: • TR3E: 960 TCH ETSI (8 E1 Ater lines) • TR3A: 768 TCH ANSI (8 T1 Ater lines) • Fully equipped TCSM3i can support: • 6 TC2C × 2 TR3E × 960 = 11520 TCH ETSI • 6 TC2C × 2 TR3A × 768 = 9216 TCH ANSI • 6 TC2C × 2 TR3E × 8 Ater lines = 96 E1/T1 Ater  384 E1/T1 A-IF • up to 24 BSC can be connected to a single TCSM3i cabinet • Implementation of CESoPSN in TCSM3i • 4 (active + spare) ETIP1-A can be installed in TCSM3i: • 1 ETIP is used to handle Ater interface • 3 ETIP are used to handle A interface, one ETIP can serve 2 (adjacent) TC2C • If the whole Ater is over IP the Ater ETIP in TCSM3i has to be configured as a synch master and an ETIP in the BSC as a synch slave.

  22. Integrated IP card for BSC3i and TCSM3i Planning and dimensioning aspectsImpact on implementation planning • Redundancy aspects • ETIP1-A PIU is represented by functional unit ETIP • Redundancy implementation concept are: • HW protection (N+N, active PIU has its own spare one) • Line protection (each board has two individual Ethernet interfaces while only one of them is active at the time) • IP addressing • IP addresses of the devices installed in FlexiBTS, BSC3i, TCSM3i are used during creation of PSN tunnel and its PWs: any mismatch is to be avoided

  23. PCU2 HW Evolution and Asymmetrical … BSS14 for Network Planners • Hardware Support • Flexi BSC and Double Capacity AS7 Unit. • Integrated IP card for BSC3i and TCSM3i • PCU2 HW Evolution and Asymmetrical PCU HW configuration

  24. PCU2 HW Evolution and Asymmetrical … • PCU2 HW Evolution and Asymmetrical PCU HW configuration • Benefits • Configuration and capacity • Dimensioning rules (connectivity and asymmetrical setup) • Modified parameters, new alarms

  25. PCU2 HW Evolution and Asymmetrical … PCU2 HW Evolution and Asym. PCU HW config. Benefits PCU related S14 features are expected to bring the following benefits • PCU2-E • Allows to increase packet data capacity within the same space • Optimized for Flexi BSC • Supports higher user peak rates • Better Gb link utilization. More cells per PCU gives better multiplexing gain in Gb. • Asymmetrical PCU HW configuration • Optimizes and simplifies PCU usage in different BCSU • Less PCU plug in units needed with the feature • Its benefit can be immediately seen in the scenarios like: • PCU capacity extension (in a single BCSU): user needs to add only 1 single PCU to the BCSU where insufficient PCU capacity is observed • TRX capacity extension:user needs to add another BCSU (without or with minimum PCU configuration) • Various amount of PCUs in different BCSU

  26. PCU2 HW Evolution and Asymmetrical … Benefits of PCU2-E • PCU2-E can also be used in the BSC3i 660 and BSC3i 1000/2000 • Performance improvement is a prime reason to install PCU2-E in BSC3i types • Mixture of PCU2-E and PCU2-D is possible within BSC3i • Due to different internal structure in BSC3i and Flexi BSC the PCU2-E can reach half of its max possible capacity in when used in BSC3i 660/1000/2000 • PCU2-E can handle up to 512 Abis channels in BSC3i 660/1000/2000

  27. PCU2 HW Evolution and Asymmetrical … Characteristics of PCU2-EPCU2-E capacity • PCU2-E capacity is collected in the table below together with the respective values of PCU2-D for comparison • The capacities below are achievable per logical PCU in Flexi BSC Parameter PCU2-E PCU2-D 2 #logical PCU 1 #Abis channels 1024 256 #BTS objects 384 128 #EGPRS cells 256 64 #GPRS/EGPRS TRX 1024 / 720 256 / 192 #EDAP 60 16 #BCF 384 128 Note: PCU2-D capacity figures are maintained in RG10 in comparison to S13 ones

  28. PCU2 HW Evolution and Asymmetrical … Gb interface capacity for PCU2-E and PCU2-D • Overall, applicable for both PCU2-E / PCU2-D • Max Gb throughput can be reached with more than 1 FRL • Gb over FR: capacity of the Frame Relay links may limit the PCU throughput • Gb over IP: Gb connectivity does not limit the PCU throughput Parameter PCU2-E PCU2-D 2 Mbps (32 TSL x 64 kbps) # max Gb throughput per logical PCU )* 8 Mbps (128 TSL x 64 kbps) # of bearer channels per logical PCU 16 FRL/NS-VC 4 FRL/NS-VC capacity per FR link 1…31 TSL (1984 kbps) 1…31 TSL (1984 kbps) Total rate of FRLs / logical PCU 128 x 64 kbps 32 x 64 kbps *) incl. both user traffic and overheads

  29. PCU2 HW Evolution and Asymmetrical … BSC type BSC3i 660 BSC3i 1000 BSC3i 2000 Flexi BSC max #PCU2-Eper BCSU 1 (not 2) 3 (not 5) 3 (not 5) 5 #Abis channels per PCU2-E 512 512 512 1024 #active BCSU per BSC / #logical PCU per BSC 6 / 6 5 / 15 10 / 30 6 / 30 Abis bw in max conf ~ 98 Mbps ~204 Mbps ~ 409 Mbps ~ 491 Mbps Possible configuration of PCU2-E • PCU2-E can be installed in Flexi BSC and any BSC3i but certain additional rules exist • PCU2-E can be installed neither in BSCi nor in BSC2i • There are 2 rules to be considered when using PCU2-E in BSC3i 660/1000/2000 • Limited number of PCU slots in BCSU can host PCU2-E due to limitations of power supply and cooling systems • 512 Abis channels can be reached due to connectivity implementation in BSC3i 660/1000/2000

  30. PCU2 HW Evolution and Asymmetrical … Mixed PCU configuration • Different amount of PCUs in different BCSUs of the same BSC or different PCU HW variants in the same slots of different BCSUs • ‘mixed PCU configuration’ is possible however some restrictions exist, i.e. the following mixtures are allowed within the same BCSU track of different BCSU • PCU, PCU-S, PCU-T, PCU2-U, empty slot • PCU-B, PCU2-D, empty slot • PCU2-E, empty slot • Mixed PCU configuration in such context is a new functionality that leads to “asymmetrical” PCU configuration

  31. PCU2 HW Evolution and Asymmetrical … Asymmetrical PCU configuration • Asymmetrical PCU configuration is available as a separate RG10 feature • Before the feature: • Each BCSU in the BSC is equipped with the same PCU configuration (number of PCUs and their type) • For e.g. let’s assume a BSC3i 2000 equipped with 10 (active) BCSUs and 1 PCU in each BCSU • Let’s say that 1 out of 10 BCSUs needs another PCU to be installed (due to PS traffic) • To do so, each and every BCSU would need to have second PCU installed • 10 extra PCUs are needed in case of fully equipped BSC3i 2000 to add 1 PCU in 1 BCSU

  32. PCU2 HW Evolution and Asymmetrical … Asymmetrical PCU configuration • With the feature: • PCU can be installed and activated according to actual traffic needs with granularity 1 in every BCSU separately • Each active BCSU can have different number of PCUs (depending on actual traffic requirements), i.e. it may happen that some BCSU have no PCU units while the other ones have some PCU installed • Different PCU types can be mixed in the same BSC/BCSU (restrictions concerning the same BCSU track exist -> see previous slide) • BCSU which is marked as primary spare must be equipped with the number of PCU sufficient to replace any of the active BCSU

  33. PCU2 HW Evolution and Asymmetrical … PCU2 BSW PCU2-E HW PCU2 BSW PCU2 BSW PCU2 BSW PCU2 BSW PCU2-E HW PCU2 BSW OPTIONAL – activated according traffic requirements PCU2 BSW OPTIONAL – activated according traffic requirements PCU2 BSW PCU2 BSW PCU2-E HW PCU2 BSW PCU2 BSW PCU2 BSW Spare BCSU PCU2-E HW PCU2 HW and SW Activation in S14 For E.g. with Flexi BSC and with Asymmetrical PCU HW Configuration • PCU2-E HW is installed according traffic requirements • PCU2-E SW is activated according traffic requirements • In minimum one PCU2-E HW unit + one PCU2-E HW unit for spare BCSU • In maximum four PCU2 BSW licenses per one PCU2-E HW plug-in unit • One PCU2 BSW license = 256 Abis channels (16 kbit/s) • Example : • Minimum configuration for 1 BSC => • 1 + 1 PCU2-E HW units + one PCU2 BSW license

  34. PCU2 HW Evolution and Asymmetrical … PCU2-E Dimensioning • Impact of PCU2-E introduction on PCU dimensioning/planning • Overall PCU HW requirements for BSS14 • All existing PCU units (PCU1, PCU2) could still be used with the basic S14 SW release • All new packet data related application SW features would require PCU2 • Impact of introduction of PCU2-E on PCU dimensioning • Dimensioning concept does not need to be modified • All static limits must be checked against the corresponding values determined per BSC (planning area) • Utilization rate should be additionally taken into account • The basic formula used for PCU dimensioning is

  35. PCU2 HW Evolution and Asymmetrical … Parameters • No new parameters • Modified parameters: only ranges of those parameters that are explicitly dependent on modified static limits should be subject to modification, e.g. new PCU variant (PCU2-E) must be configurable in addition to former types

  36. PCU2 HW Evolution and Asymmetrical … Counters and alarms • PCU2-E requires no new counters nor measurements (apart from FRL measurement), it does not affect functional triggering points either) • only the amount of FRL measurements is extended due to increase in the number of FRL supported • No new alarms are introduced due to PCU2-E • only the amount of alarms (since the alarm count parameter is generally scaled according to the number of object instances raising the alarm) is to be extended (e.g. EGPRS DYNAMIC ABIS POOL FAILURE from 16 to 60 objects) • New alarms related to ‘Asymmetrical PCU configuration’ • primary_spare_bcsu_missing_a: PCU configuration of BSC is asymmetrical and primary spare BCSU unit definition is missing • primary_spare_bcsu_invalid_a: Primary spare BCSU unit PCU configuration is invalid. Primary spare BCSU unit can not replace all BCSUs

  37. Thank you for your attention!

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