Blade Cluster

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Blade Cluster

SAS

Top right corner for field-mark, customer or partner logotypes. See Best practice for example.

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Bullets level 2-520 pt

Ericsson Confidential 2007-03-082

Motivations

Smooth migration towards IMS by means of HW re-utilization, Integrated Site (IS) structure.

Scale MSC-Server solution (up to 15 blades in MSC SBC).

Seamless upgrade/update.


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FAN

MXB

SIS

CER

IMS

IMS

MSC

MSC

MSC

MSC

MSC

MSC

MSC

MSC

CER

SIS

MXB

FAN

Smooth migration towards IMS

As traffic migrates from CS to IMS, HW can be re-configured from an MSC blade system to an IMS blade system.

IMS CSIMS CSIMS CS

FAN

MXB

SIS

CER

IMS

IMS

IMS

IMS

MSC

MSC

MSC

MSC

MSC

MSC

CER

SIS

MXB

FAN

FAN

MXB

SIS

ISER

IMS

IMS

IMS

IMS

IMS

IMS

IMS

MSC

MSC

MSC

ISER

SIS

MXB

FAN


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Common concept for scalability and robustness

MSC cluster approach:

distribute load between

members of a cluster of

MSC-S blades

Facilitates seamlessupgrades, zero downtime:Isolate traffic from oneblade (other bladescontinue to run traffic),upgrade it and bring itback into service.

Signaling Proxy/SGW for link aggregation

OSS

CERCERISERISER

SISSIS IOIOSISSIS IOIOSGWSGW

MSC-Sblade

MSC-Sblade

Signalingproxy

Signalingproxy

MSC-Sblade

MSC-Sblade

MSC-Sblade

MSC-Sblade

MSC-Sblade

MSC-Sblade

n+m redundancy

1+1

1:n relation

RAN CN

SAN

MSC-S Cluster

1+1

TDM/ATMi/f

TDM/ATMi/f

SCTP/IP

NW I/F


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MGW-1MGW-1 MGW-2MGW-2 MGW-3MGW-3

MSC-in-pool vs. MSC cluster

1. Move the distribution function from the RAN to the MSC cluster

2. Replicate VLR data between cluster members

RNCRNC

MSC-Pool MSC-Cluster

Load control and distribution functionLoad control and

distribution function

HLRHLR

MSC-1MSC-1 MSC-2MSC-2 MSC-3MSC-3

HLRHLR

MSC-1MSC-1 MSC-2MSC-2 MSC-3MSC-3

MGW-1MGW-1 MGW-2MGW-2 MGW-3MGW-3

RNCRNCLoad control

and distribution function

Load control and distribution

function

Note: both concepts can coexist: MSC-in-pool is possible on NW level in the MSC-cluster solution


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Signaling Proxy/SGW - motivation

Traditional C7 I/f are expensive compared to IP

The SGW is used as an aggregation node for many C7 interfaces

towards a broadband IP/SCTP interface

The SGW can hide the Application Server node/network topology by

doing an address translation

The SGW acts as the i/f device owner

facilitates the n+m redundant MSC processor blades

A SGW helps to achieve geographic redundancy.

A SGW is a means to change the addressing in the application

servers from point codes to IP addresses, and hence becoming a

vehicle for a more IP centric network approach


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I&V Configurations

MSC-S BC Small

4 MSC and 2 TSC blades, 1 ISL testboard, 2 APG43, 1 SPX, IP, ATM, TDM GS, optional extension to 2 SPX possible.

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MSC-C BC Small Configuration without optional extension


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I&V Configurations

MSC-S BC small

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MSC-C BC Small Configuration showing optional extension in second cabinet.


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I&V Configurations

MSC-S BC Medium

11 MSC and 2 TSC blades, 2 ISL X-Boards , 2 ISL testboards ,2 APG43, 2 SPX, ATM, TDM, GS.

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MSC-C BC Medium Configuration – Cabinet 1


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I&V Configurations

MSC-S BC Medium

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MSC-C BC Medium Configuration – Cabinet 2


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I&V Configurations

MSC-S BC Large

15 MSC and 2 TSC blades, 2 ISL X-Boards , 2 ISL testboards ,2 APG43, 2 SPX, ATM, TDM, GS.

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MSC-C BC Large Configuration – Cabinet 1


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I&V Configurations

MSC-S BC Large

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MSC-C BC Large Configuration – Cabinet 2


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Call setup inside the Cluster

MSC blades The MSC blades are single processing blades. Redundancy is

achieved by allocating a primary and a buddy blade for each subscriber registered in the system. The MSC blades host the complete MSS functionality.

TSC blades The TSC blades are single processing blades. Redundancy is

achieved on network level, by connecting 2 routes (one on each TSC blade) towards other core network nodes. The TSC blades execute only transit functionality, i.e. all ISUP and BICC traffic destined to the MSC is handled by these elements. ISUP and BICC protocols are terminated and converted to an internal protocol, before sending the traffic to the MSC-blades. Optionally, they can also work as a pure transit node, relaying ISUP and BICC traffic towards other network nodes.


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Call to mobile subscriber inside the cluster mobile number

TSC (SPC - 1) TSC (SPC - 2)

MSC/GMSC/SSF MSC/GMSC/SSF MSC/GMSC/SSF MSC/GMSC/SSF MSC/GMSC/SSF…

SGW

TSC (Blade 1) TSC (Blade 2)

MSC/GMSC (Blade 3) MSC/GMSC (Blade 4) MSC/GMSC (Blade 5) MSC/GMSC (Blade 6) MSC/GMSC (Blade n)…

SPX

ISUP/BICC

Internal OIP signalling

1.

2.

3.4.

Traffic distribution


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Call to mobile subscriber inside the cluster mobile number

Step Description 1 The SPX has selected TSC 1 to handle the call via round robin in the M3UA configuration

(detailed chapter x.y.z). The call setup message (IAM) received by the TSC blade includes a mobile subscriber number. TSC blades are not allowed to perform HLR interrogation, because this potentially would lead to an unbalanced load between the TSC blades. On TSC blades just transit calls are allowed. In this call case on the TSC blade and internal trunk shall be seized distributing the traffic to all MSC blades (Error! Reference source not found.. for details). System internally on the TSC blade a round robin mechanism selects one MSC to perform HLR interrogation (Blade 4 in the example). Between TSC and MSC blades an MSC-S BC internal protocol is used for configuration details see chapter Error! Reference source not found..

2 On blade 4 the first traffic analysis instance will seize a GRI route for HLR interrogation. For the addressing of required MAP messages between the MSC-S BC and HLR and HLR and MSC-S BC/VLR see chapter x.y.z SCCP connectivity in MSC-S BC for details. In MSC-S BC each MSC blade owns at least one MSRN series (see chapter Error! Reference source not found.. for details). In the shown case a MSRN that terminates on blades 6 is provided.

3 In the traffic analysis instance after HLR interrogation the MSRN is analyzed (see chapter Error! Reference source not found.. for details). The call is routed via internal protocol to the terminating blade.

4 The Call terminates on blade 6.


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Outgoing Call from mobile subscriber



SGW


MSC/GMSC (Blade 3) MSC/GMSC (Blade 4) MSC/GMSC (Blade 5) MSC/GMSC (Blade n)…

SPX

ISUP/BICC


2.

1.


MSC/GMSC (Blade 6)


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Outgoing Call from mobile subscriber

Step Description

1 A mobile subscriber located on blade 3 calls a subscriber outside the cluster. Assuming that both TSC blades have connectivity to the destination, an internal trunk shall be seized distributing the traffic to all TSC blades. If a mobile subscriber located inside another node belongs to the same network the HLR interrogation is done directly on the blade 3 as already described in the previous example. All MSC are configured as GMSC.

2 In the traffic analysis instance on the TSC blade an outgoing towards the destination is seized.


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Call to mobile subscriber MSRN received

/Handover in non anchor MSC


MSC/GMSC/SSF MSC/GMSC/SSF MSC/GMSC/SSF MSC/GMSC (Blade 6) MSC/GMSC/SSF…

SGW



SPX

ISUP/BICC


1.

2.



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Call to mobile subscriber MSRN received /Handover in non anchor MSC

Step Description 1 The SPX has selected TSC 1 to handle the call via round robin in the M3UA configuration

(detailed chapter x.y.z). The call setup message (IAM) received by the TSC blade includes an MSRN owned by the MSC-S BC. For efficient routing purposes in MSC-S BC also TSC blades are aware which MSRN series are own by which MSC blades inside the cluster (see chapter Error! Reference source not found.. for details). This information is used to the call is routed via internal protocol to the terminating MSC blade.

2 The Call terminates on Blade 5.


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Mobile originating to mobile terminating call


MSC/GMSC/SSF MSC/GMSC/SSF MSC/GMSC/SSF MSC/GMSC (Blade 6) MSC/GMSC/SSF…

SGW



SPX

ISUP/BICC


1.



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Mobile originating to mobile terminating call

Step Description 1 As all MSC blades are configured as GMSCs and a mobile subscriber of the own network is

called HLR interrogation is done on the MSC blade 3. At HLR interrogation a MSRN owned by blade 6 is received. Finally the call terminates on Blade 6.


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Transit Call


SGW



SPX

ISUP/BICC



MSC/GMSC (Blade 6)

1.

Call handled on own blade


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Transit Call

Step Description 1 The SPX has selected TSC 1 to handle the call via round robin in the M3UA configuration . The

call setup message (IAM) received by the TSC blade includes a B-number which is determined for another node in the network. In the traffic analysis instance on the TSC blade an outgoing towards the destination is seized. If this one is congested an alternative internal trunk route can be selected to route the call via other TSC blade towards the destination. Please note that only complete B-Numbers shall be sent between blades. Overlap sending of digits is not supported between blades.


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References

MSC Server Blade Cluster Configuration User Guide MSC-S BC dimensioning and packaging analysis


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Blade Cluster

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