Transcript C14-MMSS-20070108 - Meeting Contributions

Multimode System Selection - Examples
3GPP2 TSG-C SWG1.4 - MMSS Ad Hoc
Vancouver, Jan. 2007
Paul Oommen, Mark Cheng – Nokia
Doug Dunn, Amit Kalhan, Tim Thome, Henry Chang – Kyocera
Scott Droste – Motorola
Stephen Dick – InterDigital
Dan Willey- RIM
Kyocera Corporation, Nokia, Motorola, InterDigital and Research In Motion grant a free, irrevocable license to 3GPP2 and its
Organizational Partners to incorporate text or other copyrightable material contained in the contribution and any modifications thereof in
the creation of 3GPP2 publications; to copyright and sell in Organizational Partner's name any Organizational Partner's standards
publication even though it may include all or portions of this contribution; and at the Organizational Partner's sole discretion to permit
others to reproduce in whole or in part such contribution or the resulting Organizational Partner's standards publication. Kyocera
Corporation, Nokia, Motorola, InterDigital and Research In Motion are also willing to grant licenses under such contributor copyrights to
third parties on reasonable, non-discriminatory terms and conditions for purpose of practicing an Organizational Partner’s standard which
incorporates this contribution.
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This document has been prepared by Kyocera Corporation, Nokia, Motorola, InterDigital and Research In Motion to assist the
development of specifications by 3GPP2. It is proposed to the Committee as a basis for discussion and is not to be construed as a
binding proposal on Kyocera Corporation, Nokia, Motorola, InterDigital and Research In Motion. Kyocera Corporation, Nokia, Motorola,
InterDigital and Research In Motion specifically reserve the right to amend or modify the material contained herein and to any intellectual
property of Kyocera Corporation, Nokia, Motorola, InterDigital and Research In Motion other than provided in the copyright statement
above.
© 2006-2007
Overview of Key Points
• The proposed solution allocates the functionality of each access technology
to reside completely within that technology’s domain, resulting in the following
benefits
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No constraints which would impede future modifications to each access
technology
No interference to the techniques unique to each access technology, including
authentication and provisioning
No need to update the cdma2000® PRL or other access technology information
every time there are modifications to any of the other access technologies
Ability to support simultaneous operation of multiple access technologies
Ability to accommodate the addition of future access technologies and operator
specific MMSS parameters.
Supports operator-controlled mode settings which either allows both manual or
automatic system selection, or only allows automatic-only mode selection.
• Examples in this document also illustrate that the proposed solution provides
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all the functionality required to permit an operator to program its preferred roaming
agreements in the presence of all mixes of access technologies
mechanisms to introduce location-dependent data
“cdma2000® is the trademark for the technical nomenclature for certain specifications and
standards of the Organizational Partners (OPs) of 3GPP2. Geographically (and as of the date of publication), cdma2000® is
© 2006-2007 a registered trademark of the Telecommunications Industry Association (TIA-USA) in the United States.”
Multimode System Selection Overlay Function
MOBILE STATION
Multimode System Selection (Overlay)
Overlay Parameters
CDMA and nonCDMA Systems
3GPP2
Network
Selection
3GPP
PLMN
Selection
WiMAX
Network
Selection
IEEE 802.11X
PRL
PLMN List
…
SSID List
WWAN
Figure 1: Overlay Function
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WLAN
MMSS WWAN Overlay Parameters
MMSS System Priority Lists
(MSPL)
MMSS Location-associated
Priority List (MLPL)
Index
SYS_TYP
PRI_CLASS
SYS_PRI
0
CDMA
HOME
more
1
GSM
HOME
more
2
CDMA
ANY
more
3
GSM
ANY
same
0
CDMA
ANY
more
1
GSM
ANY
same
0
CDMA
HOME
more
1
GSM
HOME
same
SYS_PRI – System Priority
0
CDMA
HOME
more
HIGHER_PRI_SRCH_TIME – Higher Priority Search Time
1
GSM
PREF
same
LOC_PARAM_TYPE
LOC_PARAM_VAL
00000000
Default
00000001
Korea/*
00000010
*/Operator-B
00000010
Japan/Op-B
00000010
China/Op-C
MSPL_INDEX
Figure 2: Example of WWAN Overlay Parameters for
GSM and CDMA
SYS_TYP – System Type
PRI_CLASS – Priority Class
Note: Refer to C14-MMSS-20061030003_updated_KYO_NOK_RIM_MMSS_Proposal
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HIGHER_PRI_
SRCH_TIME
MMSS System Priority List: Priority Class
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Priority Class (PRI_CLASS) defines a class of networks that allowed to be selected in a
specified system type
“Priority Class” provides a means to define network selection priority over system
selection priority
The use of Priority Class shall not require changes to the system selection procedure
followed in a system.
“Priority Class” in 3GPP systems
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“Priority Networks” in 3GPP2 systems
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HOME – home PLMNs only (including equivalent PLMNs or ePLMN)
PREFERRED – home PLMNs + preferred visiting PLMNs
ANY – any PLMNs
HOME – Home networks only (including highest priority networks in a geo-location in another
country)
PREFERRED – home network + preferred roaming networks
ANY – any network
“Priority Networks” in other access technologies
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•
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HOME
PREFERRED
ANY
The priority class 'Home' includes home network and networks that can be considered
equivalent to the home network in the sense that these networks are defined with highest and
same priority in the network priority list for the system (i.e. in PRL or PLMN). Home network is
understood as the network the user is subscribed to."
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Advantages
• The modular approach in Fig. 1 maintains the independence of network
selection for each radio.
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Each system maintains its own Network Selection and authentication/encryption
credentials
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Each System/Radio can be considered a client of the MMSS Algorithm
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MMSS is a Layer 7 mechanism, it’s sole purpose is to prioritize which radio is first to be used, and take inputs from the client
radios to make a determination on which system is to be used for which purpose.
Allows addition of new Access Technologies (for example WiMax, TD-SCDMA, PHS, iBurst, etc…)
•
Unlike a PRL-based approach where complexity increases significantly if more than 2 systems are implemented within a
single list.
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Changes in WWAN/WLAN standards will not impact 3GPP2 MMSS
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Modular approach allows this flexibility
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Significant that some WWAN/WLAN approaches can be very dynamic
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Local Standards and proprietary approaches can be supported if required for non-3GPP2 technologies, e.g. WAPI
The joint proposal does not define implementation - chipset/handset vendors are open to the implementation of
system/technology lists/tables
In the joint proposal the MSPL associated with a location area can be individually updated.
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Changes here, if hard-coded into 3GPP2 will impact all 3GPP2 participants
Easily allows simultaneous multi-radio operations
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They are very dynamic at present in some communities
Allows for alternate Authentication technologies
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Applications can be an issue here - single list allows for single radio/system only
To reiterate - Each Radio/System manages it’s own provisioning for system selection from a standards perspective
Advantages
•
With this joint proposal, there is no need to update the entire set of parameters each time a change
or addition occurs. Updates are provided only for those elements that have been changed or are
being added. (In contrast, in the case of a PRL based MMSS approach, a large PRL will be updated
for all devices in a network whenever a change occurs for one or more of the supported systems in
the multimode device. In the PRL based approach, complexity increases with each system, WLAN
or WWAN included in the PRL)
•
In the joint proposal the MSPL associated with a location area can be individually updated.
•
Because of the modular approach as shown in Fig 1, which maintains the independence of network
selection for each system, the mobile device may operate in multiple modes simultaneously.
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The overlay parameters are updated over-the-air using OTASP/OTAPA
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The parameter blocks can be stored either in the ME or the R-UIM in the same way as other OTASP/OTAPA
parameters are stored.
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Parameters for a specific system can be updated from that system.
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For example using the joint proposal, WLAN parameters can be updated from the WLAN network., Similarly GSM and other
systems can be updated using their specific method.
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Using the PRL based approach requires the CDMA network to update the PRL for changes to WLAN.
Additionally, IP based OTA, such as OMA DM, can be easily used. Parameters can be updated
through Management Objects (MOs) in the same way as C.S0064-0 (IOTA-DM).
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3GPP2 Legacy Support
• MMSS is a new feature.
•
Legacy devices, that do not support this new feature, should follow normal
procedure and ignore any OTASP/OTAPA messages associated with the new
parameters.
• The OTAF should discern the capabilities of the device being provisioned
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Through the Protocol Capability Message Request and Response as provided in
current OTASP specifications
3GPP2 Devices shall handle system updates gracefully, and the OTAF should only
provide appropriate information
Only MMSS parameters should be provisioned via IS683(x)
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“System” in this context is only 3GPP2, not alternate access technologies
– Items only within the scope of the MMSS system requirements
– MMSS clients must manage their system selection/access for non-3GPP2
access technologies
Based on pre-provisioning information in operators equipment database
– Can support R-UIM as well as existing embedded info in handsets
– ESN/MEID, Mobile Model ID/Firmware (status request/response)
3GPP2 IOT Process/Procedures should support this
– Use cases are defined already for some parameters
– Completion after the MMSS related specifications are stable
Examples of Roaming
• Example 1 (China): KDDI customer roaming in China. KDDI is a CDMA
operator in Japan. China has two mobile operators, China Mobile with GSM
and China Unicom with both GSM and CDMA. When a KDDI customer is
roaming in China, the roaming priority order for KDDI may be China Unicom
CDMA, China Unicom GSM and then China Mobile GSM.
• Example 2 (India): KDDI customer is roaming in India. Reliance has both
GSM network and CDMA network in India. And there is another CDMA
operator TATA. If KDDI has a good business relationship with Reliance, the
priority for KDDI may be Reliance CDMA, Reliance GSM and TATA CDMA.
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System Priority Lists and Location
Association (Examples 1 & 2)
MMSS Location-associated Priority List
(MLPL)
LOC_PARAM_TYPE
LOC_PARAM_VAL
MMSS System Priority Lists (MSPLs)
MSPL_INDEX
00000000
Default
0
00000001
China/CU-CDMA
1
00000001
India/Reliance
2
Figure 3. Example of WWAN parameters for
Roaming in China and India
CU-CDMA – China Unicom
CDMA
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0
CDMA
HOME
more
1
GSM
HOME
more
2
CDMA
ANY
more
3
GSM
ANY
same
0
CDMA
HOME
more
1
GSM
PREF
same
0
CDMA
HOME
more
1
GSM
HOME
more
2
CDMA
ANY
same
0
1
2
State Diagram (Examples 1 & 2)
Location
Determination
Location known:
Use MSPL
Use MLPL
Location
not found
Initialization
Default
Location
Use Default MSPL
System Lost/System
Reselection/
Timer based reselection
Overlay:
Find Priority
System
(MSPL)
Network acquisition failure
Location
unkown
Idle State
Network Acquired
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Overlay
Wait State:
Information from
Network Selection
System selected
Priority System in
MSPL:
PRI_CLASS
(HOME, PREF,
ANY)
System Selection – Example 1
1.
2.
3.
4.
5.
6.
7.
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Initialization: User power on the device in China. Location and System is unknown.
Location Determination (use MLPL): Location is determined as China.
Find Priority System (use MSPL): In the MLPL in Fig 3, CU-CDMA entry points to an MSPL (index 1) where CDMA
HOME is the highest priority. (Home can mean highest priority network or equivalent to home network, which is CU
for KDDI subscribers when roaming in China).
Find Network: Accordingly the MS tries to acquire a network of CDMA (with overlay condition as HOME, i.e. high
priority network in the CDMA PRL for the CDMA geo-location). The MS follows standard CDMA process, using a
standard CDMA only PRL. The CDMA PRL must have CU-CDMA with appropriate priority compared with other
CDMA networks in China. The MS will try to acquire CU-CDMA network following standard CDMA procedures.
System Reselection: The overlay will use available information from network selection which is independent of
overlay. If network acquisition is not successful for CU-CDMA, the MS will not acquire another CDMA network of
lesser priority in the PRL since the priority of CDMA system in step 3 was HOME (highest priority in CDMA PRL) .
Find Priority System (use MSPL): The MS will try to find the next priority system in the MSPL, which is GSM PREF
(Fig 3, MSPL with index 1).
Find Network: The MS uses standard GSM PLMN list in the ME (or Smart Card) to find the most preferred GSM
network. The PLMN list should contain CU-GSM with high priority followed by CM-GSM (China Mobile – GSM).
The MS tries to acquire CU-GSM following standard GSM procedures. If not successful, the MS tries to acquire
the next preferred network in the PLMN list (because the overlay condition is GSM PREF the MS can continue to
use the PLMN list to find a preferred network), which is CM-GSM. The MS tries to acquire CM-GSM following
standard GSM procedures.
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System Selection – Example 2
1.
Initialization: User power on the device in India. Location and System is unknown.
2.
Location Determination (use MLPL) Location is determined as India.
3.
Find Priority System (use MSPL):. In the MLPL in Fig 3, the entry for Reliance points to an MSPL (index 2) where
CDMA HOME is the highest priority.
4.
Find Network: Accordingly the MS tries to find a network of CDMA (with HOME as the overlay condition). The MS
follows standard CDMA process, using a standard CDMA only PRL. The CDMA PRL must have Reliance-CDMA
entry with appropriate priority compared with other CDMA networks in the CDMA geo-location in India. MS will try
to acquire Reliance-CDMA network following standard CDMA procedures.
5.
System Reselection: The overlay will use available information from network selection which is independent of
overlay. If network acquisition is not successful for Reliance-CDMA, the MS will not acquire another CDMA
network of lesser priority in the PRL since the priority of CDMA system in step 3 was HOME (highest priority in
CDMA PRL) .
6.
Find Priority System (use MSPL): The MS will try to find next priority system in the MSPL, which is GSM HOME
(Fig 3, MSPL with index 2).
7.
Find Network: The MS uses standard GSM PLMN list in the ME (or Smart Card) to find the most preferred GSM
network. The PLMN list should contain Reliance-GSM with high priority compared with other GSM networks. The
MS tries to acquire Reliance-GSM network following standard GSM procedures.
8.
System Reselection: The overlay will use available information from network selection which is independent of
overlay. If network acquisition is not successful for Reliance-GSM, the MS will not acquire another GSM network
because the priority of GSM system in step 6 is HOME (high priority network in PLMN list).
9.
Find Priority System (use MSPL): The MS will try to find the next priority system in MSPL, which is CDMA PREF.
10. Find Network: The MS uses standard CDMA only PRL in the ME (or Smart Card) to find the most preferred CDMA
network (with the information that Reliance-CDMA is not available). The CDMA PRL should have an entry for
TATA-CDMA network with priority below Reliance-CDMA network. MS will try to acquire TATA-CDMA network
following standard CDMA procedures.
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Summary and Conclusion
• The proposed solution meets all requirements for the Overlay
Function, is far simpler to maintain, and lends itself to simultaneous
operation of multiple access technologies
• Examples in this contribution have eliminated the last several
concerns; e.g. the ability of an operator to program its preferred
roaming priorities
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