Huawei WNP_NP_SRF_.pdf

8/10/2019 Huawei WNP_NP_SRF_.pdf

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3GPP2

TSG-N

TITLE:

WNP(NP_SRF)

SOURCE: Huawei/CWTS ZuJian LiHuawei Technologies Co., Ltd

Huawei Customer Service Building, KefaRoad, Science-based Industrial Park,Shenzhen, P. R. China

Tel : +86 755 26532261Fax : +86 755 26532265

Email : [email protected]

ABSTRACTThis contribution further provides recommendations for supporting wireless portability

between PLMN (such as GSM network) and CDMA network.,making using of the

WIN functions.

RECOMMENDATION:

The proposed text be accepted as WNP phase II .


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1 INTRODUCTION

1.1 OBJECTIVE

This contribution provides recommendations for supporting wirelessportability between PLMN (such as GSM network) and CDMAnetwork.,making using of the WIN functions.

1.2 SCOPE

This document specifies the wireless network impacts of Number Portability(NP),

specifically network portability. In this document, network portability is the ability of

end users to retain the same directory numbers(DNs) whenever the end users changebetween PLMN (such as GSM network) and CDMA network.

1.3 ORGNIZATION

2 FUNCTIONAL OVERVIEW

2.1 NORMATIVE REFERENCE

2.2 INFORMATIVE REFERENCE

2.3 FEATURE DEFINITIONS

Wireless Number Portability (WNP) is a service that provides mobile subscribers the

ability to retain the existing MSISDN numbers when switching from one subscriptionnetwork to another. The new subscription network shall provide services for

subscribers, and they are able to get access to the same supplementary services and

value-added services as other subscribers of the new network, which is not going to be

restricted by the previous network.

The new subscription network shall allocate a new IMSI (SIM card) to WNP

subscribers. If the recipient network is unable to provide some service of the donor

network, NP subscribers shall lose it.

The networks involved in the WNP include: originating network (the network the

number belongs to, for example, originating network for numbers starting with 130 is

the China Unicom in China), number donor network (for example, if subscribers switch

to CDMA network from GSM network, GSM network will be the number donor


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network), and number recipient network (for example, if subscribers switch to

CDMA network from GSM network, CDMA network will be the number recipient

network).

Any network is able to donate and receive the number, and one number can be

switched for multiple times, even switched back to its originating network.

2.4 SYMBOLS AND ABBREVIATIONS

IMSI International Mobile Station IdentityNP Number PortabilityWNP Wireless Number PortabilityCFU Call Forward UnconditionalGMSC Gateway MSC

HLR Home Location RegisterNP-SRF Signalling Relay Function for support of NPMSC Mobile service Switching CentreDB Number Portability DatabasePLMN Public Land Mobile NetworkRN Routing NumberSMS Short Message ServiceSRI Send Routeing InformationVMSC The Visited MSC

2.5 NETWORK REFERENCE MODEL


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Figure 1 Network Reference Model

AC Authentication Center

BS Base Station

EIR Equipment Identity Register

HLR Home Location Register

IP Intelligent Peripheral

ISDN Integrated Services Digital Network

MC Message Center

MS Mobile Station

MSC Mobile Switching Center

PSTN Public Switched Telephone Network

SCP Service Control Point

SME Short Message Entity

SN Service Node

VLR Visitor Location Register

3 WNP(NP_SRF)

VMSC

NP_SRF

GMSC

DB

VMSC GMSC

In this solution , a new device(NP_SRF) will added before HLR and MC. All SCCP

message send to HLR and MC must be relayed by an NP_SRF, NP_SRF is going to

analyze the signaling message with NP numbers, then to query NP-DB, and determine

the way to process the messages based on the query.

Compare with the call forward solution or Intelligent solution, NP_SRF solution hasmany Advantages:

Only NP_SRF devices are to be added and no upgrade is necessary to otherdevices and software in the network;

Call delay wont be affected, no redundant signaling will be generated, and therewont be any signaling bottleneck;

NP services of both call Related and Non-call Related (such as short message, etc.)can be implemented through the signaling processing;

No alternative voice circuit;


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4 INFORMATION FLOW

4.1 Call Flow Analysis

4.1.1 When NP Subscriber Is the Caller

The MDN number of NP subscriber is not changed, and NP service has no effect on the

call when the NP subscriber is the caller.

4.1.2 When Subscriber of Other Network (such as GSM) Calls NP

Subscriber

When NP subscriber is the called, the NP-SRF of GSM network shall add the prefix

RN identifying the subscription network for NP-out subscribers when requiring the

route, and the NP-SRF of CDMA network shall record the number of subscription HLR

of NP-in subscribers and replace the destination address.

VMSC

STP

NP-SRF

NP-SRF DB

NP-HLR

GMSC

2

3 5

4

11

12

SubscriberA

SubscriberB

1

GSMNetwork

CDMANetwork

6

DB

7

GMSC

VMSC

8 9

15

16

HLR

13

14

10

The steps are as follows:

1). Subscriber A of GSM network calls NP subscriber B;2). VMSC originates the SRI request to the HLR of GSM network;3). STP transfers SRI to NP-SRF;4). NP-SRF analyzes the message and sends it to NP-DB for querying;5). NP-DB finds the subscriber is NP subscriber, and adds the prefix RN;6). NP-SRF returns the SRI response to VMSC by taking RN + MSISDN asMSRN;

7). STP transfers the SRI response to VMSC;


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8). VMSC finds it is the number of other networks, and connects the voicecircuit directly to the GMSC of GSM network;

9). The GMSC of GSM network connects the voice circuit to that of CDMAnetwork;

10). The GMSC of CDMA network originates the LOCREQ request with theRN + MSISDN;

11). NP-SRF analyzes the message, removes the prefix RN and queries it inDB;

12). DB finds it is the NP-in subscriber, and changes the SCCP destinationaddress to the NP-HLR number;

13). NP-SRF sends the LOCREQ message to NP-HLR;14). NP-HLR returns the LOCREQ response, with the roaming numberattached;

15). The GMSC of CDMA network connects the voice circuit to VMSC;

16). VMSC connects the voice circuit to the subscriber.

4.1.3 When Subscriber of CDMA Network Calls NP-in Subscriber

VMSC

NP-SRF

2

4

3

SubscriberA

SubscrberB

1

CDMANerwork

DB

VMSC 11

HLR

NP-HLR

5

8

7 69

10

The steps are as follows:

1) Subscriber of CDMA network calls NP-in subscriber B;2) VMSC originates the LOCREQ request to HLR (if VMSC finds it is

the subscriber of another network, the route requiring is compulsory,

and it can not be trunked to GMSC directly, otherwise, the

alternative voice circuit may be caused.);3) NP-SRF intercepts and analyzes the message and sends it to NP-DB

for querying;4) NP-DB finds the subscriber is NP-in subscriber, and returns the

number of NP-HLR to NP-SRF;

5) NP-SRF transfer the LOCREQ to NP-HLR by changing NP-HLR asthe SCCP destination address;


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6) NP-HLR originates ROUTREQ operation to the called VMSC,

requires the roaming number;7) VMSC returns the roaming number to NP-HLR;8) NP-HLR sends the LOCREQ response directly to the calling VMSC;9) The calling VMSC connects the voice circuit to the called VMSC;

10) VMSC connects the voice circuit to the subscriber

4.2 Short Message Flow Analysis

4.2.1 When NP Subscriber Sends Short Message

For the short message sent by NP subscriber, the SMC is addressed according to the

calling IMSI. So, the short message sent by NP subscriber won't have any consequence.

4.2.2 When Subscriber of Other Network (such as GSM) Sends Short

Message to NP Subscriber

GSM network shall add the prefix RN of the subscription network for NP-out

subscriber, and CDMA network shall record the number of fixed MC of NP-in

subscribers and replace the destination address, and the network-crossing short

message requires the support of short message gateway between CDMA network

and GSM network.

VMSC

DB

STP

NP-SRF

SMC G-SMC G-MC

NP-SRFDB

DestinationMC

NP_HLR

VMSC

2

3

6

8

95

4

10

11

16

17

18

19

SubscriberA

SuscribeB

1

GSMNetwork

CDMANetwork

7

12

NP-SRF

DB14

1513

The steps are as follows:1) Subscriber A of GSM network sends short message to NP subscriber

B;


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2) VMSC sends the SMMO request to the short message center of the

caller;3) STP transfers SMMO to NP-SRF;4) NP-SRF analyzes the message and sends the called number to

NP-DB for querying;

5) NP-DB finds the subscriber is NP subscriber, and adds the prefix RN

before the called number;6) NP-SRF transfer the message to the short message center;7) The short message center finds RN + MSISDN is the number of

other networks, and sends the short message directly to the short

message gateway of GSM network;8) After the format conversion, the short message gateway of GSM

network is able to send the message to the gateway of CDMA

network;

9) The gateway of CDMA network sends the SMDPP message with theRN + MSISDN as the destination address;

10) NP-SRF analyzes the message, removes the prefix RN and queries it

in DB;11) DB finds it is the NP-in subscriber, and returns the address of

Destination MC;12) NP-SRF sends the SMDPP message to Destination MC;

13) Destination MC requires SMSADDR from HLR;14) NP-SRF intercepts and analyzes the message and sends it to NP-DB

for querying;15) NP-DB finds the subscriber is NP-in subscriber, and returns the

number of NP-HLR to NP-SRF16) NP-SRF transfer the SMSADDR to NP-HLR by changing NP-HLR

as the SCCP destination address;17) NP_HLR returns SMSADDR response;

18) Destination MC sends SMDPP to VMSC;19) VMSC send the short message to the subscriber.

4.2.3 When Subscriber of CDMA Network Sends Short Message to

NP-in Subscriber

CDMA Network shall record the number of MC of NP-in subscriber and replace the

destination address.


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VMSC

DB

NP-SRF Destination

MC

VMSC

SubscriberB

CDMANetwork

9

7 815

16

OriginatorMC

1

2

6

DB

NP-SRF

54

3

SubscriberA

NP_HLR

13

14

NP-SRF

DB

1112

10

The steps are as follows:1) Subscriber A of CDMA network sends short message to NP-in

subscriber B;2) VMSC sends the SMDPP message to the short message center of the

caller, the destination address is the MIN number of the caller;3) NP-SRF analyzes the message and sends the called number to

NP-DB for querying;4) NP-DB finds the subscriber is NP subscriber, and adds the prefix RN

before the called number;5) NP-SRF transmit the message to the short message center;

6) It is analyzed to be NP-in subscriber according to the prefix when

coming through the Originator MC, and the number segment is not

to be processed by the MC. The processed message is sent to the

Destination MC, and the destination address is the GT code of RN

+ MSISDN;7) NP-SRF intercepts and analyzes the message and sends it to NP-DB

for querying;8) DB finds it is the NP-in subscriber, and returns the address of

Destination MC;9) NP-SRF transfer the SMDPP message with the Destination MC

number as the SCCP destination address;10) Destination MC requires SMSADDR from HLR;

11) NP-SRF intercepts and analyzes the message and sends it to NP-DB

for querying;


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12) NP-DB finds the subscriber is NP-in subscriber, and returns the

number of NP-HLR to NP-SRF13) NP-SRF transfer the SMSADDR to NP-HLR by changing NP-HLR

as the SCCP destination address;14) HLR returns SMSADDR response;

15) Destination MC sends SMDPP to VMSC;16) VMSC send the short message to the subscriber.

5 SIGNAL PROTOCOL

Refer to IS826.

Refer to GSM 0902

Refer to GSM 0366

6 SIGNAL PROCEDURE

Refer to IS826.

Refer to GSM 0902

Refer to GSM 0366

Documents

Huawei WNP_NP_SRF_.pdf