gb interface detailed planning_final[1]
TRANSCRIPT
Core Network Planning Gb Interface Detailed Planning
1
NOKIA 2000 Gb interface detailed planning
Agenda Gb interface introduction Gb review ( protocol stack / ntw layers ) Gb in detail ( NSE / logical connections ) Frame relay interface planning BSC dimensioning Frame relay dimensioning SGSN dimensioning Gb Detail planning ( e.g. Topology ) Exercise 1: case study Nortel BSS Nokia SGSN Exercise 2: detailed planning2 NOKIA 2000 Gb interface detailed planning
Gb InterfaceGb interfaceSGSN BSC
Frame RelayPCU PAPU
BSS GPRS
3
NOKIA 2000 Gb interface detailed planning
Gb Interface ReviewGPRS InterfacesSMS-GMSC SMS-IWMSC E D MSC/VLR Gd A Um Gb Gs Gr Gn SGSN Gp GGSN other PLMN4 NOKIA 2000 Gb interface detailed planning
Signalling & Data Transfer C Signalling
HLR
Gc Gi GGSN PDN TE
MS
BSS
Gn SGSN
Gf EIR
Gb Interface ReviewGPRS Protocol Stack / transmission planeUm APP TCP/UDP IP SNDCP LLC RLC MAC GSM RF MS RLC MAC GSM RF BSS Relay BSSGP NS L1 Relay SNDCP LLC BSSGP NS L1 GTP UDP IP LLC/SNAP MAC L1 GTP UDP IP LLC/SNAP MAC L1 USER PAYLOAD Gb Gn Gi APP TCP/UDP IP L2 L1
Radio interface
G703 Frame Relay
SGSN
100 Mbps Ethernet
GGSN
GPRS IP Backbone
Internet
SNDCP: Sub-Network Dependent Convergence Protocol The primary function of BSSGP is to provide the radio-related, QoS, and routing information that is required to transmit user data between a BSS and an SGSN. A secondary function is to enable two physically distinct nodes, the SGSN and BSS, to operate node management control function . BSSGP: Base Station System GPRS Protocol NS: Network Service SNAP: Subnetwork access protocol5 NOKIA 2000 Gb interface detailed planning
Gb Interface ReviewGPRS Protocol Stack / signalling planeGMM/SM GMM/SM
LLC
Relay
LLC
RLC
RLC
BSSGP
BSSGP
MAC
MAC
NS
NS
GSM RF
GSM RF
L1
L1
MSRadio interface
BSS
SGSNG703 Frame Relay
6
NOKIA 2000 Gb interface detailed planning
Gb Interface ReviewNetwork LayersGb BSC SGSNGPRS IP Backbone Network
Intra-site Gn
Inter-site Gn SGSN
Gb BSC
GPRS
TCP/IP
ATM & FR
Transport/SDH
7
NOKIA 2000 Gb interface detailed planning
Gb Interface ReviewGb InterfaceGb BSC SGSN Frame Relay BSS PCU PAPU GPRS
8
NOKIA 2000 Gb interface detailed planning
Gb Interface; planning issues2 Mbps Channelised E1 link
NSNS-VC capacity: 16 kbps1.92 Mbps FR Bearer channel: 64 kbps 1.92 Mbps
9
NOKIA 2000 Gb interface detailed planning
Gb Interface ReviewNetwork Service Entity (NSE)
BVC 0 for signalling NS-VC Own BVC for each cell NS-VC Own BVC for each cell
DLCI Data Link Connection Identifier (FR address) FR Bearer Channel Physical Link (= PCM TSL) NSE NS-VC DLCI Data Link Connection Identifier (FR address) Load Sharing FR Bearer Channel Physical Link (= PCM TSL) NSE = (PCU)
BVC 0 for signalling NS-VC Own BVC for each cell NS-VC Own BVC for each cell
SGSN
BVC = BSSGP Virtual Connection BSSGP = Base Station Subsystem GPRS Protocol NSE = Network Service Entity NS-VC = Network Service Virtual Connection FR = Frame Relay
BSC
10
NOKIA 2000 Gb interface detailed planning
BSSGP BSS GPRS protocol (layer 3 protocol) delivering data packets and associated control information Supports BSSGP VIRTUAL CONNECTIONS (BVC)
One BVC for each cell One BVCI unique in the NSE
One NS-VC supports several BVCs
11
NOKIA 2000 Gb interface detailed planning
Id Unique in NSE
Gb Interface ReviewLogical StructureBSS 1Bearer Channel_1DLCI_16
NS_VCI unique in SGSN own BVC for each cell
Id Unique in bearer SGSNPAPU 1NSEI_1BVCI_0 BVCI_3 NS-VCI_7 NS-VCI_2 DLCI_17
NSEI_1NS-VCI_7 NS-VCI_2
PCU 1 LA RA 1BTS_3 BTS_6
BVCI_0 BVCI_3
Bearer Channel_2DLCI_16 DLCI_17
PCU 2NS-VCI_5 NSEI_2 BVCI_0 NS-VCI_8 BVCI_6 NS-VCI_3
NSEI_2 NS-VCI_5BVCI_0 NS-VCI_8 BVCI_6 NS-VCI_3
DLCI_18
Bearer Channel_3DLCI_16 DLCI_17
RA 2BTS_8
PCU 3 PAPU 2BVCI_8 BVCI_0 BVCI_22
Bearer Channel_4 NSEI_3 NS-VCI_4NS-VCI_1 NS-VCI_11 DLCI_16
BTS_22
NS-VCI_4 NSEI_3 BVCI_8 NS-VCI_1 NS-VCI_11 BVCI_0 BVCI_22
Bearer Channel_5DLCI_16
BSS 2PCU 3NSEI_7NS-VCI_6 BVCI_0 BVCI_22
PAPU 3NSEI_7BVCI_0 BVCI_22 NS-VCI_6 NS-VCI_9
DLCI_17
Bearer Channel_6
LA RABTS_22
BSSGP NS FR
Data Signal Data & Signal
NS-VCI_9
12
NOKIA 2000 Gb interface detailed planning
Gb Interface ReviewLogical Channels in Physical LinkBVCs NS-VCs, CIR=161.984 Mbit/s FR bearer channels, 131 TSLPCM Link 32 TSL
PCU
FR bearer channels run on PCM links (641984 kbit/s) Max. 4 NS-VCs configured on FR bearers (CIR of each 161984 kbit/s) CIR doesnt stand in relation to subscriber datarate / cell Max. 4 NS-VCs per NSE (PCU), and 256 NS-VCs per PAPU
13
NOKIA 2000 Gb interface detailed planning
Frame Relay Link Parameters - 1 BVC - 1 BVC (BVCI) for each CELL - unique within an NSE - 1 BVC (BVCI) can be mapped into 2 NS-VC (load sharing) - 1 or MORE BVCs (BVCI's) are mapped into 1 or more NS-VC - 1 SIGNALING BVC per PCU, BVCI = 0000HEX NS-VC - NS-VCI = DLCI and FR BEARER CHANNEL IDENTIFIER - 14 NS-VCs per NSE (=PCU) - up to 256 per PAPU - 1 NS-VC supports several BVC - capacity controlled by CIR in steps of 16 Kbps up to the BEARER CHANNEL capacity - NS-VCI is unique within a SGSN, identical on BOTH ENDS (end to end) ; range 065535 PCU - 1 PCU = 1 NSE (NSEI) - 1 PCU handles maximum 64 cells14 NOKIA 2000 Gb interface detailed planning
Frame Relay Link Parameters - 2 NSE - NSEI is unique within a BSC, identical on BOTH ENDS (end to end) range 065535 - on BOTH ENDS are connected by 1 or MORE NS-VC - within 1 NSE, NS-VCs are shared by all BVCs DLCI - up to 124 DLCI on 1 BEARER CHANNEL - unique within 1 BEARER CHANNEL, identical on BOTH SIDES - range 16991 BEARER CHANNEL - capacity from 64 to 1984 Kbps (1 to 31 TS of an E1) in multiples of 64Kbps PAPU - supports up to 64 PCU per PAPU SGSN - number of NS-VCs in SGSN = number of DLCI (up to 256 per PAPU)15 NOKIA 2000 Gb interface detailed planning
Gb Inteface Planning3 Sections of Gb Inteface Planning BSC Planning - defining the number of active PCUs Frame Relay Link Planning Topology Planning Frame Relay Link Dimensioning SGSN Dimensioning - defining the number of PAPU & SGSN equipments and extension units
16
NOKIA 2000 Gb interface detailed planning
Gb Inteface PlanningSelecting the Protocol OverheadPercentage of Overhead in GPRS Traffic at the Gb Interface Gb I/F Protocol Stack Protocol Min Header size (oct.) Max Header size (oct.) Reference SNDCP 3 4 GSM 04.65 LLC 5 40 GSM 04.64 BSSGP 12 54 GSM 08.18 NS 4 4 GSM 08.16 FR 6 6 GSM 03.60 Total 30 108 Packet size Min OH % Max OH % 50 60.00 216.00 60 50.00 180.00 100 30.00 108.00 150 20.00 72.00 200 15.00 54.00 256 11.72 42.19 300 10.00 36.00 400 7.50 27.00 512 5.86 21.09 750 4.00 14.40 1000 3.00 10.80 1250 2.40 8.64 1500 2.00 7.20
300216
250180
Overhead (%)
200 150 10060.0
Ohmax
108 72 54 50.0 30.0 42 20.0 15.0 11.7 36 27 10.0 7.5 21 5.9 4.0 3.0 14 11 9 2.4 7 2.0
50 0OHmi n
100 150 200 256 300 400 512 750 1000 1250 1500Packet length (octets)
17
NOKIA 2000 Gb interface detailed planning
Gb Inteface PlanningSelecting the Burst MarginThroughput
EIR=0 CIR
Discarded data Burst Margin, 100 -X% Actual traffic load, X % time
Packet data traffic is bursty in nature Nokia PCU implements a Static Frame Relay Data above the CIR is discarded (EIR = 0)18 NOKIA 2000 Gb interface detailed planning
CIR calculation should include burst margin
BSC DimensioningPacket Control Unit - PCU All BSC's BCSU units must be fully equipped with PCUs (max. 8+1 per BSC) GSWB expanded from 128 to 192 PCMs (if not already done) BSC2E/A: Extra ET5C Cartridges to increase PCMs from 80 to 112 PCU controls cells, not TRXs like BCSU PCU does not handle the same TRXs as the BCSU where it is locatedPSA20 PSFP PSA20 PSFP
SW1C
SW1C
ET5C
CLOC
CLAC
ET5C
ET5C
3rd SW64B cartridges
MCMU
MCMU
BCSU
WDDC
WDDC
BCSU
BCSU
BCSU
BCSU
BCSU
OMU
BCSU
ET5C
ET5C
PCU HWin every BCSU
BCSU
BCSU
ET5C
ET5C
ET5C cartridges
19
NOKIA 2000 Gb interface detailed planning
BSC DimensioningDefining the active number of PCUs Dimensioning Criteria for the number of active PCUs: 1. Each BSC in GPRS coverage area has to contain at least one active PCU (minimum requirement) 2. PCU can supports 256 TCHs 3. PCU Data processing capacity is 2 Mbit/s 4. PCU can support up to 64 cells 5. PCU can supports 128 TRX's
20
NOKIA 2000 Gb interface detailed planning
BSC DimensioningSimple Dimensioning Example (PCU) 3 BSC (with capacity of 128 TRXs ) Input Calculations Result21
Coverage area contains 60 BTS sites, each having 2+2+2 cell/TRX configuration 4 TCHs/cell used by GPRS on average Estimated GPRS traffic: 15 Mbit/s + 19% Overhead = 18.5 Mbit/s
Packet size of 400 bytes assumed1. Minimum requirement: 3 BSC => 3 PCUs required (each for 128 TRX) => 3 PCUs required 2. 60 x 3 cells = 180 cells, 180/64=2.8 3. 12 TCH/BTS x 60 BTS=720 TCH, 720/256 => 3 PCUs required 4. GPRS traffic: 18.5 Mbit/s / 2 Mbit/s = 9.3 =>10 PCUs required
Take the biggest of the results above, I.e. 10 active PCUs required in total
NOKIA 2000 Gb interface detailed planning
Frame Relay Link PlanningLink Dimensioning Frame Relay traffic is carried in logical 64 kbit/s PCM time slots. Each active PCU has its own separate Gb interface connection, I.e. FR connection
Capacity: n * 64 kbit/s, where n =131. 64 kbit/s 1.984 Mbit/s (E1 speed)
At least one 64 kbit/s PCM TSL is required per active PCU
22
NOKIA 2000 Gb interface detailed planning
Frame Relay Link PlanningLink Dimensioning Dimensioning criteria for the number of 64kbit/s links: 1. At least two 64 kbit/s channels per BSC is recommended (due to bursty nature of data) 2. At least one 64 kbit/s channel per active PCU 3. Dimensioning is based on estimated GPRS traffic during the Busy Hour, + the estimated protocol overhead on the Gb interface traffic + margin for bursting
23
NOKIA 2000 Gb interface detailed planning
Gb Link DimensioningSimple Dimensioning Example (Gb links) Total number of PCUs in 3 BSCs: 10 PCUs Estimated total GPRS traffic during the BH: 15 Mbit/s Overhead correction: + 19% Packet size of 400 bytes assumed 15 Mbit/s * 19% = 18.5 Mbit/s 1. Two 64 kbit/s links per PCU (10 * 2) links 2. GPRS traffic: 18.5 Mbit/s / 64 kbit/s = 289.1 links Take the bigger of the results above, I.e. 290 links ( 64 kbit/s) required in total (equals to 10 E1 PCM links) => 20 => 290Input24
NOKIA 2000 Gb interface detailed planning
Result
Calculations
SGSN DimensioningDX 200 SGSNSGACPDFU 0 PDFU 1 0 PDFU 0 CL SU 1 SMMU 0 2 SMMU 1
SGBCPDFU 1 CL BU 0 CL BU 1
One fully equipped SGSN element has the following design targets concerning connectivity: 120 physical 2Mbps E1-PCMs PCMs are freely selectable between Gbinterface and SS7 based interfaces (Gs, Gr, Gd, Gf) 96 SS7 signalling links (24 per SMMU) 1024 64kbps Frame Relay links for Gbinterface use (64 in each PAPU) E.g 100 BSCs each having 8x64kbps Gbinterface connection could be connected into one SGSN 16 100-baseTX Ethernet connections for Gn-interface use (one in each PAPU) Maximum of 16 000 Routing Areas, 2 000 Location Areas
PAPU 0
GSW 0
GSW 1
3 MCHU 0 SD MCHU 0 SD MCHU 1 MCHU 1 4 SMMU 2 SMMU 3 SMMU 4
5 OMU 0 SD OMU 0 SD OMU 1 OMU 1 6 PAPU 5 PAPU 6 PAPU 7 PAPU 8
7 ET 0 ( 32 * ET2E/A) ET 1 ( 28 * ET2E/A) 8 PAPU 9 PAPU 10 PAPU 11 PAPU 12
9 PAPU 1 PAPU 2 PAPU 3 PAPU 4 10 PAPU 13 PAPU 14 PAPU 15 PAPU 16
25
NOKIA 2000 Gb interface detailed planning
SGSN DimensioningSGSN Capacities Data processing capacity of fully equipped SGSN: 48 Mbit/s Subscriber capacity: 120 000 Active PDP contexts: 240 000 1024 64kbit/s FR links for Gb-interface use (64 in each PAPU) 96 SS7 signalling link interfaces ( 64 kbit/s, 24 in each Fully equipped SGSN contains: SMMU) 16+1 PAPUs (Packet Processing Unit) 4+1 SMMUs (Signalling & Mobility Management Unit)
26
NOKIA 2000 Gb interface detailed planning
SGSN DimensioningSGSN Configuration LevelsCapacities: SGSN Basic Unit4 PAPUs, 1 SMMU 4 PAPUs, 1 SMMU
12 Mbit/s 30 000 subscr. 256 Gb IF (64kbit/s) 24 Mbit/s 60 000 subscr. 512 Gb IF (64kbit/s) 36 Mbit/s 90 000 subscr. 768 Gb IF (64kbit/s) 48 Mbit/s 120 000 subscr. 1024 Gb IF (64kbit/s)
Extension Units
4 PAPUs, 1 SMMU 4 PAPUs, 1 SMMU
SGSN can be configured in four steps. The right configuration level for each case is determined by the dimensioning rules.
27
NOKIA 2000 Gb interface detailed planning
Gb Interface DimensioningSimple Dimensioning Example (Summary)
BSC
SGS N4 PAPUs, 1 SMMU
BSC
4 PAPUs, 1 SMMUBSC
10 active PCUs in 3 BSCs
4 PAPUs, 1 SMMU
290 links (64kibt/s) in 10 E1 PCM links
1 Basic Unit & 2 Extension Units in the SGSN
28
NOKIA 2000 Gb interface detailed planning
Gb INTERFACE DETAILED PLANNING
29
NOKIA 2000 Gb interface detailed planning
GPRS Dimensioning Considerations FUTURE SCENARIOS - Operator's short and long term plans concerning the network expansions and evolution to new technologies CAPACITY DEMAND - Subscriber volume - GPRS traffic estimation - GPRS coverage area EXISTING NETWORK INFRASTRUCTURE - Existing Transmission, Data Communication backbone and GSM network infrastructures30 NOKIA 2000 Gb interface detailed planning
Topology and Dimensioning Requirements BSC Distribution PCU Distribution among MSC sites Network Topology Network Architecture Subscriber Distribution GPRS Traffic Distribution Overhead % Requirement Burst Margin Future Network Expansion
31
NOKIA 2000 Gb interface detailed planning
GPRS Coverage PlanningFrom the requirements stated on the previous slide we can determine the following : - GPRS coverage areas - Topology and Capacity of the Frame relay links in a GPRS service area - GPRS network dimension per coverage areas
32
NOKIA 2000 Gb interface detailed planning
BSC & PCU Distribution Among MSC SitesBSC Distribution Among MSC SitesSubscribe r Percentage of re gional BSCs 13.9% 89.4% 1.7% 10.6% 14.0% 75.3% 4.6% 24.7% 11.2% 40.3% 8.0% 28.9% 10.8% 74.4% 8.6% 36.4% 8.5% 30.8% 9.6% 40.6% 5.4% 23.0% 3.7% 25.6% 100.0% 2000 55 6 50 17 33 24 37 33 26 37 21 13 352 Num ber of BSCs in year 2001 2002 2003 70 70 70 8 8 8 65 65 65 21 21 21 43 43 43 31 31 31 48 48 48 42 42 42 33 33 33 47 47 47 27 27 27 16 16 16 451 451 451 2004 70 8 65 21 43 31 48 42 33 47 27 16 451 1 2 3 4 5 6 7 8 9 10 11 12 City A City B City C City D City E City F City G City H City I City J City K City L Total REGIONS South East Mid South West
PCU Distribution Among MSC SitesSubscribe r Percentage of re gional PCUs 13.9% 89.4% 1.7% 10.6% 14.0% 75.3% 4.6% 24.7% 11.2% 40.3% 8.0% 28.9% 10.8% 74.4% 8.6% 36.4% 8.5% 30.8% 9.6% 40.6% 5.4% 23.0% 3.7% 25.6% 100.0% 2000 110 12 100 34 10 7 74 66 7 74 42 26 562 Num ber of PCUs in year 2001 2002 2003 140 140 140 16 16 16 130 130 130 42 42 42 12 12 13 9 9 9 96 96 96 84 84 84 10 10 10 94 94 94 54 54 54 32 32 32 719 719 720 2004 140 16 130 42 13 9 96 84 10 94 54 32 720
1 2 3 4 5 6 7 8 9 10 11 12
City A City B City C City D City E City F City G City H City I City J City K City L Total
REGIONS South East Mid South West
33
NOKIA 2000 Gb interface detailed planning
GPRS Service AreasCoding Schemes CS1 CS2 CS3 CS4 9.05 13.4 15.6 21.4 Attached Subs Active Subs 2 PDP Contexts 1 PDP Context Mean PDP / sub PDCH per cell CS2 (Kbps) thru per cell (Kbps) traf_sub (KBytes BH) Overhead thru_sub (Kbytes BH) thru_sub (Kbps) SGSN fill rate 100% 50% 50% 50% 1.5 3 13.4 40.2 50 25% 62.5 142.22 70%
SGSN area 1 SGSN area 2 SGSN area 3 SGSN area 4 SGSN area 5
City 1 Cities 2 and 3 Cities 4, 5, 6, 7 and 8 Cities 9, 10, 11 and 12 Cities 13 and 14
SGSN Areas 2001 AREA 1 2001 AREA 2 2001 AREA 3 2001 AREA 4 2001 AREA 5 2002 AREA 1 2002 AREA 2 2002 AREA 3 2002 AREA 4 2002 AREA 5
GPRS Subs 19 500 28 850 33 750 14 750 19 250 49 200 52 440 57 600 49 800 55 800
Attached GPRS Subs 19 500 28 850 33 750 14 750 19 250 49 200 52 440 57 600 49 800 55 800
Active GPRS Subs 9 750 14 425 16 875 7 375 9 625 24 600 26 220 28 800 24 900 27 900
Active PDP Contexts 14 625 21 638 25 313 11 063 14 438 36 900 39 330 43 200 37 350 41 850
GPRS Traffic (Mbps) 1.39 2.05 2.40 1.05 1.37 3.50 3.73 4.10 3.54 3.97
34
NOKIA 2000 Gb interface detailed planning
SGSN AREA CALCULATIONSInitial Dimensioning Figures Covered Regions SGSN area 1 City 1 Radio Network Estimates Covered Regions S N area 1 GS City 1 GPRS Traffic (Mbps) 2001 2002 GPRS Attached Subscribers 2001 2002 Number of Cells 1 115 Min. No. of PDCH (during BHT ) 3 345 Number of S ubscribers 19 500 Number of Cells 1 115 Min. No. of PDCH (during BHT ) 3 345Nokia B 's SC Nokia B CSU's Non- Nokia PCU Non- Nokia Gb Interface Total Gb Interfaces 2001 2002 GPRS Active subscribers 9'750 24'600 18 162 0 0 80 Active PDP C ontexts 14'625 36'900
1.39 3.50
19 500 49 200
CALCULATION RESULTS PCU (Active) PCU (Hardware) Gb Interface Functionality SGSN PAPU (Active) PAPU (Hardware) SMMU 2001 18 162 22 1 4 4 1 2002
57 10 12 3
35
NOKIA 2000 Gb interface detailed planning
Ater TIMESLOT ALLOCATIONTS 00 01 02 03 04 05 06 07 08 09 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 1LAPD
2
Bits 3 4 TS 0 1 5 9 13 17 21 25 29 1 5 9 13 17 21 25 29 1 5 9 13 17 21 25 29
5 2 6 10 14 18 22 26 30
6
7 3 7 11 15 19 23 27 31 3 7 11 15 19 23 27 31 3 7 11 15 19 23 27 31
8
4 8 12 16 20 24 28 4 8 12 16 20 24 28 4 8 12 16 20 24 28
Ater Time Slot AllocationChannels of ET2E 0, interface 1
Existing E1 lines are utilized for Frame Relay traffic Voice Traffic and Frame Relay Traffic combined Throughgoing 64Kbps TS for Frame Relay traffic
2 6 10 14 18 22 26 30 2 6 10 14 18 22 26 30 64 kbit/s 64 kbit/s 64 kbit/s 64 kbit/s 64 kbit/s 64 kbit/s 64 kbit/s
Channels of ET2E 1, interface 0
Channels of ET2E 1, interface 1
Channels of ET2E 2, interface 0
TSs 25-31 can carry Frame Relay traffic (to the Gb interface).
36
NOKIA 2000 Gb interface detailed planning
DEDICATED PCM SIGNALBIT-> TS-> 1 0 1 2 3 4 5 6 7 8..31 2 3 4 5 6 LINK MANAGEMENT 64 kbit/s (Frame Relay) 64 kbit/s (Frame Relay 64 kbit/s (Frame Relay) 64 kbit/s (Frame Relay) 64 kbit/s (Frame Relay 64 kbit/s (Frame Relay) 64 kbit/s (Frame Relay) XXXX 7 8
Time Slot allocation of a dedicated E1 signal for carrying the Gb / Frame Relay traffic to the SGSN.
37
NOKIA 2000 Gb interface detailed planning
DN2 DXC EQUIPMENT OVERVIEW1 - Cross-connection Node - 2 Mbit/s - 64 kbits - nx8 kbit/s - up to 40 2 Mbit/s interfaces (G.703) 2 - Drop-and-Insert equipment (inbuilt DB 2) 3 - Primary Multiplexing Equipment (in-built DM 2) Three cartridge sizes: 20 T (four units) 40 T (eight units) 19 Subrack (sixteen units) 40-port DN 2 uses two subracks and interconnecting cables38 NOKIA 2000 Gb interface detailed planning
DN 2
2 Mbit/s
2 Mbit/s
CH
CH
D
D
PHYSICAL TOPOLOGY - 1BSC Abis Transcoders MUX MUX Ater MSC MSC/SGSN site
BSC Abis
E1 PCM (Ater + Frame Relay) SGSN Ethernet Switch GGSN #1 GGSN #2 Frame Relay Gb-int. BSC
Abis
Voice and Data Traffic are multiplexed on the same physical connection as used for the GSM traffic on the Ater interface39 NOKIA 2000 Gb interface detailed planning
PHYSICAL TOPOLOGY - 2BSC Abis Transcoders MUX Dedicated E1/ PCM for BSC Abis E1 PCM for Ater traffic Frame Relay Gb-int. BSC Abis Frame Relay traffic SGSN Ethernet Switch GGSN #1 GGSN #2 MUX Ater MSC MSC/SGSN site
Voice and Data Traffic are allocated on separate E1 / PCM signal40 NOKIA 2000 Gb interface detailed planning
PHYSICAL TOPOLOGY - 3MSC/SGSN Site 1Transcoders MSC
SGSN 1 SERVICE AREABSC
AterSGSN Ethernet Switch GGSN #1 GGSN #2
Abis MUX Dedicated E1/ PCM forBSC
MUX
Frame Relay Gb-int.
Frame Relay traffic
Abis E1 PCM for Ater traffic
MSC/SGSN Site 2BSC Transcoders MSC
Abis
Ater
SGSN 2 SERVICE AREASGSN Ethernet Switch GGSN #1 GGSN #2
Frame Relay Gb-int.
Voice and Data Traffic are allocated on different E1s41 NOKIA 2000 Gb interface detailed planning
PHYSICAL TOPOLOGY - 4MSC/SGSN Site 1 Transcoders MUX Ater SGSN 1 SERVICE AREA BSC Abis E1/PCM for FR ADM Ater TRANSPORT NETWORK E1/PCM for FR Ater MSC/SGSN Site 2 ADM BSC Abis E1/PCM for FR Ater SGSN 2 SERVICE AREA SGSN Frame Relay Gb-int. Ethernet Switch GGSN #1 GGSN #2 MUX Ater Transcoders MSC Frame Relay Gb-int. SGSN Ethernet Switch GGSN #1 GGSN #2 MSC
BSC Abis
ADM
For large capacity networks such as SDH networks Separate E1s for Ater and Frame Relay traffic42 NOKIA 2000 Gb interface detailed planning
PHYSICAL TOPOLOGY - 5MSC/SGSN siteAbisBSC
Transcoders
MSC
BSC
BSC
SGSN Packet Data Network (FR, ATM, etc.)
Ethernet Switch GGSN #1 GGSN #2
FR Switch
FR Switch
Gb Interface
GPRS traffic is concentrated and carried e.g. in a packet data network over the Gb interface43 NOKIA 2000 Gb interface detailed planning
EXAMPLE BSC / PCU CONFIGURATION
44
NOKIA 2000 Gb interface detailed planning
EXAMPLE SGSN/PAPU Configuration
45
NOKIA 2000 Gb interface detailed planning
Nortel BSS - Nokia SGSNExercise 1 - Case Study
46
NOKIA 2000 Gb interface detailed planning
Tasks for Exercise Make a draft of 2 BSCs connected to Nortel PCU Nortel PCU interfaces Nokia SGSN You can assume 10 timeslots of traffic in E1 frame per BSC (10 x 64kbps) Allocate bearer channels, NS-VCs, DLCIs, SGSN, PAPUs Show some redundancy options
47
NOKIA 2000 Gb interface detailed planning
Background to Encountered ProblemsFrame Relay over E1 must be used Timeslots reserved for FR bearer channels are specified in SGSN Nokia assumes that channelised FR is supported by Nortel PCU, as it isa standard FR feature and normally supported by Nortel Passport.
Nortel BSS - Nokia SGSN interoperability tests not complete enough Tests were carried out with one NSE/bearer channel so the fullcapability of Nokia SGSN was not tested
Nokia SGSN supports several NSEs per bearer channel Blu in Italy, upto 5 NSEs/bearer channel Depending in the FR capabilities of the PCU in question, Nokia maydeploy different FR solutions48 NOKIA 2000 Gb interface detailed planning
SolutionNokia and Nortel together implement the technical solutions proposed in the following slides in the Dutchtone network Both vendors will document the test results for Dutchtone andfor their own interoperability documentation
Nokia proposes to take an action point to Carry out the interoperability test with Nortel in the Dutchtonenetwork
Fully document the SGSN Frame Relay capabilities Changes to SGSN software or Change Deliveries would not deactivate the solution in future
49
NOKIA 2000 Gb interface detailed planning
50
NOKIA 2000 Gb interface detailed planning
2 BSCs terminated into same PAPUNORTEL PCU BSC 1 BSC 1 SGSN PAPU_1 NSE1 NSVC_1 NSE1 NS-VC1BEARER CH. 1
NSE2 NSVC_2
DLCI_16 E1 BSC 2 DLCI_17 BSC 2 NSE2 NS-VC2 CIR (31 - n) x64 kbps E1 CIR n x64 kbps
Remarks: A Bearer channel can be associated to several NSEs, channel rate n x 64 Kbps Bearer channel minimum rate = 64 Kbps EIR set to null Maximum 50 NS-VCs/bearer channel If NS-VCs are terminated into same PAPU, they can be carried over same bearer channels51 NOKIA 2000 Gb interface detailed planning
2 BSCs terminated into different PAPUsNORTEL PCU BSC 1 BSC 1 NSE1 NS-VC1 IF 50% of E1 per BSC, FULL E1 REQUIRED SGSN PAPU_1 NSE1 NSVC_1
BEARER CH. 1
CIR n x64 kbps, n=1..31 E1
DLCI_16 E1 BSC 2 NSE2 NS-VC1BEARER CH. 2
DLCI_17
CIR
(31 - n) x64 kbps
BSC 2
PAPU_2 NSE2 NSVC_1
Remarks: A Bearer channel can be associated to several NSEs, channel rate n x 64 Kbps Bearer channel minimum rate = 64 Kbps EIR set to null Maximum 50 NS-VCs/bearer channel If NS-VCs are terminated into different PAPUs, they have to be carried over separate bearer channels52 NOKIA 2000 Gb interface detailed planning
Typical GbSGSN NORTEL PCU BSC 1 BSC 1 NSE1 NS-VC1 BSC 2E1 E1 BEARER CH. 1 DLCI_16 DLCI_17 BEARER CH. 2 DLCI_18 PAPU_2 DLCI_19 E1 BEARER CH. 3 DLCI_20 DLCI_21 E1 NSE3 NSVC_3 NSE4 NSVC_4 E1 CIR n x64 kbps E1 PAPU_1 NSE1 NSVC_1 NSE2 NSVC_2 CIR (31 - n) x64 kbps CIR n x64 kbps
BSC 2
NSE2 NS-VC2 BSC 3
BSC 3
NSE3 NS-VC3
BSC 4 BSC 4 NSE4 NS-VC4 BSC 5 BSC 5 NSE5 NS-VC5 BSC 6 BSC 6 NSE6 NS-VC6 REMARKS: About 1/2 E1 required per BSC PAPU processing capacity 3 Mbps -> 1 BSC can be connected into same PAPU, each occupying 15 x 64 k FRNSE5 NSVC_5 PAPU_3 NSE6 NSVC_6
53
NOKIA 2000 Gb interface detailed planning
Gb with RedundancySGSN NORTEL PCU BSC 1 BSC 1 NSE1NSVC_1 NSVC_2 E1 E1 BEARER CH. 1 DLCI_16 DLCI_17 BEARER CH. 2 DLCI_18 E1 E1 PAPU_1
NSE1NSVC_1 NSVC_2
NSE2NSVC_3 NSVC_4
BSC 2 BSC 2 NSE2NSVC_3 NSVC_4
DLCI_19
54
NOKIA 2000 Gb interface detailed planning
Detailed planning exerciseExercise 2
55
NOKIA 2000 Gb interface detailed planning
Input for exerciseBSC 2 BSCs (geographically split) 1. BSC ( 16 sites connected each 2 cells) 2 BCSUs 8 x 64k TS GPRS traffic for 8 sites on each PCU 2. BSC (6 sites connected each 2 cells) 1 BCSUs 6 x 64k TS GPRS traffic for 6 sites56 NOKIA 2000 Gb interface detailed planning
SGSN One PAPU
FR links BSC BSC1 is connected with 2 FR links while BSC2 has one FR link connection
Considerations for the planning Prepare an overview of the network Dimension FR links (Bearer channels) Allocated all ids : NSEI,BVCIs, NS-VCIs, DLCIs, and define the capacity of all Bearer channels and DLCs. Also include some examples of load sharing or protection This is a freestyle exercise so there is no really a right solution of this exercise.
57
NOKIA 2000 Gb interface detailed planning
Overview of the network - output16 TS = 16*64kbps BSC 12 BCSUsPCU1 BEARER CH. 1
DLCI_16 E1(1) DLCI_17 E1(1)
CIR 4 x64 kbps
SGSN
22 TS = 22*64kbpsNSE3 NSVC_3/4
PCU-2 BEARER CH. 2
PAPU_1 NSE1 NSVC_1/2
E1(2)
DLCI_16 DLCI_17
E1(2) NSE2 NSVC_5/6
6 TS = BSC 2 6*64kbps 1 BSCU
BEARER CH.3 PCU-1
DLCI_16 E1(1) DLCI_17 CIR 3 x64 kbps E1(1)
58
NOKIA 2000 Gb interface detailed planning
Overview of the network output BCBearer channel = 8 TS = 8*64kbps = 512kbpsBSC 1 2 BCSUsBEARER CH. 1 PCU1
Bearer channel = 8 TS = 8*64kbps = 512kbpsCIR E1(1) 4 x64 kbps PAPU_1 NSE1 NSE2 NSVC_3/4
DLCI_16 E1(1) DLCI_17
SGSN
PCU-2 BEARER CH. 2
NSVC_1 /2 E1(2) DLCI_16 DLCI_17 E1(2) NSE3
NSVC_5/6BEARER CH.3
BSC 2 1 BSCU
PCU-1
DLCI_16 E1(1) DLCI_17 CIR 3 x64 kbps E1(1)
Data link connection = 2x 3*64kbps = 2 x 128kbps Bearer channel = 6*64kbps = 384kbps59 NOKIA 2000 Gb interface detailed planning
NSE1 NSVC_1 /2
Overview of the network output NSEI/NS-VCIBEARER CH. 1 PCU1
BSC 1 2 BCSUs
DLCI_16 E1(1) DLCI_17 E1(1)
CIR 4 x64 kbps
SGSN PAPU_1 NSE1 NSE2 NSVC_3/4
PCU-2
NSE2 NSVC_3/4 E1(2)
BEARER CH. 2
NSVC_1 /2 DLCI_16 DLCI_17 E1(2) NSE3
NSVC_5/6BEARER CH.3
BSC 2 1 BSCU NSE3
PCU-1
DLCI_16 E1(1) E1(1) CIR DLCI_17 CIR 3 x64 kbps (31 - n) x64 kbps
NSVC_5/6
60
NOKIA 2000 Gb interface detailed planning
Overview of the network output BVCIBSC PCU 1 - 8 sites site cell BVCI 1 1 1 2 2 3 2 4 3 5 3 6 4 7 4 8 5 9 5 10 6 11 6 12 7 13 7 14 8 15 8 16
BSC 1 2 BCSUs1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16
PCU1 PCU-2
BSC PCU 2 - 8 sites site cell BVCI 1 1 1 2 2 3 2 4 3 5 3 6 4 7 4 8 5 9 5 10 6 11 6 12 7 13 7 14 8 15 8 16
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16
BSC 2 1 BSCU
PCU-1
61
NOKIA 2000 Gb interface detailed planning
Thank you !!!
62
NOKIA 2000 Gb interface detailed planning
GSM architectureAir Interface
BSSAbis InterfaceBSC
NSSA Interface
Ater Interface
BTS
TC MSC/VLR
HLR/ AC/ EIR
TCSM
Ater Interface
O&M Interface
NMS
63
NOKIA 2000 Gb interface detailed planning