Identifying Femtocells Closed Subscriber Groups in IEEE 802.16m
Document Number: IEEE C80216m-09_2599
Date Submitted: 2009-11-06
Source:
Ying Li, Anshuman Nigam,
Jung Je Son, Zhouyue Pi,
Jungshin Park
Email: yli2@sta.samsung.com
Phone: +1-972-761-7903
Samsung Electronics
Venue:
IEEE Session #64
Base Contributions:
Re:
Contribution in support of a comment on LB30a
Purpose:
Notice:
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Use cases to support
• Use cases will direct and shape our specific design
• The possibilities of use cases could be, for example,
– 1. Home
• E.g., a home owner can buy a femto and open it up only to family
members and friends
– 2. Enterprise
• E.g., a company can buy tens/hundreds femtocells to enhance the
connectivity, then such femtos can be open only to the company
employees
– 3. Membership
• E.g., a use can buy a membership of Starbucks, which means all the
femtocells owned by Starbucks should be open to the user
– 4. Operator
• E.g., the operator uses femtocells to fix coverage holes, then such
femtocells should be open to subscribers of this operator
– And so on.
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Motivation (1/2)
• Accessibility of a femto BS
– OSG Femtocell BS: accessible to all MSs
– CSG-open femtocell: open to all MSs, but subscriber MS has higher priority, and
non-subscriber MS has best-effort access.
– CSG-closed Femtocell BS: only accessible to its authorized MSs, though open to
all MSs for emergency access.
• An MS needs to determine whether it is allowed to access a CSG-closed
Femtocell, and whether it is a member or non-member of a CSG-open
femto.
• MS locally carries a white list, containing all the common identifier of CSG
femtos. Femto broadcasts the information of the common identifier, so
that MS can use white list to help for it to know whether it is a member of
femto.
• MS needs to know the common identifier to request scanning : In D2,
“An AMS may scan femto ABSs based on the CSG white list”
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Motivation (2/2)
• Common ID [called CSG ID] – to ease the management
– Several Femtocell BSs could belong to a same CSG entity, which have the
same group of authorized MSs.
– Benefits of using a common CSG ID for this set of BSs
 Shorten the list of allowable femtocells stored in MS
 To ease the management at the paging controller, and avoid location update
when the MS is moving inside the CSG.
 To ease the management of subscriber groups. E.g., an MS subscribes a
membership of Samsung, which has many offices. Consider an enterprise installs
a new femto BS in its office,
 Without CSG ID, the enterprise has to ask the operator to update it by adding this new femtocell
to the white list of all its membership subscribers
 With CSG ID, such update is not needed.
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Proposed Text
AMS’s local white list may contain the allowable BS IDs or common identifiers of CSGs and
relevant information to help derivation of the allowable BS IDs from common identifier.
The common identifier is composed from few or all of the 24 MSB bits of the full BSID and few or
all of the 24 LSB bits of the full BSID, thereby enabling it to be implicitly derived from the full BSID.
This common identifier is known as the CSGID.
The information of which bits are designated as the CSGID can be per Operator ID. It can be preprovisioned or unicasted during initial network entry in AAI_REG_RSP. Multiple Operator IDs can
have the same mapping information.
If such information is not signaled by the BS then the MS can assume specified default values.
An AMS may scan femto ABS based on the CSG white list. AMS may include the common identifier
of the designated CSG femto BSs in the SCN-REQ.
When BS receives the SCN-REQ including the BS ID or common identifier of a CSG, the BS may
include in the SCN-RSP the other BS IDs belonging to the requested CSG.
AMS may include the common identifier of the designated CSG femto BSs in the NBR-REQ.
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Advantages of Our Proposal
• Advantages
– Fast: CSGID can be carried in SFH SP.
– Efficient: Reduce bits in SCN-REQ/RSP.
– Ease the CSG management
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