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Page 1 Control Plane Roaming LBS Roaming Meeting, Denver January 18, 2007

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Page 1

Control Plane RoamingLBS Roaming Meeting, Denver

January 18, 2007

Control Plane RoamingLBS Roaming Meeting, Denver

January 18, 2007

Page 2Control Plane Roaming Update

• A few CP deployments out there, with a few more on the way

• Growing number of Control Plane enabled mobiles

• Control Plane roaming is important and seems straightforward

• It was agreed at previous LBS Roaming Summits that an RLP variant would be used as the protocol between Control Plane MPCs as opposed to IS-41 based ISPOSREQ / isposreq as defined in IS-881

• Openwave has defined such a variant and is in the process of releasing the spec to the CDG IRT and this group

• A review of the Openwave spec is required and potential enhancements and standardization efforts need to be considered

• The RSP / CRX issues (no access to true serving system information) still need to be resolved

Page 3IS-881 Roaming Call Flow

LCS Client

MS

MLP SLIR (MDN,…)

LPREQ (MPCID, MDN,…)

IS-801 exchange

GPOSREQ (MSID, MPCAP, ServingCellID,...)

gposreq (POSINFO)

H-MPC

S-PDE

S-MSC

a

c

b

d

e

f

g

h

i

j

HLR

k

l

S-MPC

lpreq (MSID, MPCAddr (serving), MSCID (serving), MPCAP…)

ISPOSREQ (MSID, MSCID (serving),…)

ISPOSREQ (MSID,…)

Paging / Traffic Channel

Assignmentisposreq (MPCAP, MSCID, ServingCelID, MOBINFO,…)

isposreq (POSINFO,…)

MLP SLIA (POSINFO,…)

Page 4

Expected Control Plane Roaming Architecture

RSP RSP

Home Operator Visited Operator

MSC/VLR

H-MPC

HLR

IS-41 Signaling

HLR

H-MPC

V-MPC

IP Network (L3)

IP Network (L3)

V-PDELCS Client

IP Traffic

Page 5RSP Issue

• Most operators prefer to use RSP for roaming

• RSP provide peering point for SS7/IS-41 exchange between operators

• RSP provides intermediary HLR function

• During registration, home operator receives generic MSCID provided by RSP

• Home operator won’t be able to map generic MSCID to correct V-MPC for L3 interface

• Also the message used on the L3 interface to invoke the V-MPC needs to pass the serving MSCID to allow the V-MPC to execute local IS-881 procedures (e.g., invoke the serving MSC)

Page 6RSP Issue Illustrated

• MS registers and RSP replaces MSC/VLR MSCID with generic RSP MSCID• LCS Client queries H-MPC for roaming MS• H-MPC uses LOCREQ/SMSREQ to receive MSCID (RSP HLR) from HLR• H-MPC needs to map MSCID (RSP HLR) to the IP address of V-MPC• Because MSCID is generic RSP MSCID, the H-MPC doesn’t know where the V-MPC is

RSP RSP

Home Operator Visited Operator

MSC/VLR

H-MPC

HLR

IS-41 Signaling

HLR

H-MPC

V-MPC

IP Network (L3)

IP Network (L3)

V-PDELCS Client

IP Traffic

MSCID = RSP HLR

MSCID = RSP HLR

MSCID = MSC/VLR

RSP HLR = ?

Page 7RSP Issue Solution #1

• MS Registers and RSP provides the serving MSCID to home operator• LCS Client queries H-MPC for roaming MS• H-MPC uses LOCREQ/SMSREQ to receive serving MSCID from HLR• H-MPC maps serving MSCID to the IP address of V-MPC• H-MPC performs L3 transaction with V-MPC (passing serving MSCID)

RSP RSP

Home Operator Visited Operator

MSC/VLR

H-MPC

HLR

IS-41 Signaling

HLR

H-MPC

V-MPC

IP Network (L3)

IP Network (L3)

V-PDELCS Client

IP Traffic

MSCID = MSC/VLR

MSCID = MSC/VLR

MSCID = MSC/VLR

Visited Op = 127.4.64.1 127.4.64.1

Page 8

IP Network (L3)

IP Network (L3)

RSP Issue Solution #2

• MS registers and RSP replaces MSC/VLR MSCID with generic RSP MSCID• LCS Client queries H-MPC for roaming MS• H-MPC uses LOCREQ/SMSREQ to receive serving MSCID (that of the RSP) from HLR• H-MPC always creates IP connection (L3) with RSP• RSP maps MS IMSI in L3 messaging to V-MPC IP Address• RSP connects to V-MPC (passing serving MSCID) and provides response to H-MPC

RSP RSP

Home Operator Visited Operator

MSC/VLR

H-MPC

HLR

IS-41 Signaling

HLR

H-MPC

V-MPC V-PDELCS Client

IP Traffic

MSCID = RSP HLR

MSCID = RSP HLR

MSCID = MSC/VLR

IMSI maps to V-MPC

Page 9Next Steps

•Review and discuss Openwave’s RLP solution• Gap Analysis of RLP for IS-881 support

– Openwave’s changes and perhaps further enhancements

• Drive changes through OMA

•Review and discuss the RSP / CRX Issues