Identifying Femtocells Closed Subscriber Groups in IEEE 802.16m Document Number: IEEE C80216m-09_2599r1 Date Submitted: 2009-11-15 Source: Ying Li, Anshuman.

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Identifying Femtocells Closed Subscriber Groups in IEEE m Document Number: IEEE C80216m-09_2599r1 Date Submitted: Source: Ying Li, Anshuman Nigam, Phone: Jung Je Son, Zhouyue Pi, Jungshin Park Samsung Electronics Venue:IEEE Session #64 Base Contributions: Re: Contribution in support of a comment on LB30a Purpose: Discussion and Approval Notice: This document does not represent the agreed views of the IEEE Working Group or any of its subgroups. It represents only the views of the participants listed in the “Source(s)” field above. It is offered as a basis for discussion. It is not binding on the contributor(s), who reserve(s) the right to add, amend or withdraw material contained herein. Release: The contributor grants a free, irrevocable license to the IEEE to incorporate material contained in this contribution, and any modifications thereof, in the creation of an IEEE Standards publication; to copyright in the IEEE’s name any IEEE Standards publication even though it may include portions of this contribution; and at the IEEE’s sole discretion to permit others to reproduce in whole or in part the resulting IEEE Standards publication. The contributor also acknowledges and accepts that this contribution may be made public by IEEE Patent Policy: The contributor is familiar with the IEEE-SA Patent Policy and Procedures: and. Further information is located at and.

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. 2

3 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”

4 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.

Proposed approach Femto ABS CSG ID is part of the BS ID – CSG ID can be 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 – Different operators can have different rules of how the CSG ID is constructed. The rules can be per Operator ID. – The rules can be pre-provisioned or unicasted. – A default rule can be CSG_Type is th bit of the full BSID counted from the MSB. If CSG_Type=00, then CSGID=MSB_36 (BSID), large business case If CSG_Type=01, then CSGID=MSB_40(BSID), medium business case If CSG_Type=10, then CSGID=MSB_44(BSID), small business case If CSG_Type=11, then there is no CSGID, home use case Advantages – Fast: CSGID can be carried in SFH SP. – Efficient: no overhead for CSG ID – Ease the CSG management 5

6 Proposed Text (1/2) Page 545, line 14, insert the following text as a separate paragraphs. 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 CSG ID. The information of which bits are designated as the CSG ID can be per Operator ID. It can be pre-provisioned 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. A default rule is as follows. The 26-27th bit of the full BSID counted from the MSB is an indication of CSG_Type. If CSG_Type=00, then CSGID is the MSB_36bits of the full BSID, if CSG_Type=01, then CSGID is the MSB_40bits of the full BSID, if CSG_Type=10, then CSGID is the MSB_44bits of the full BSID, and if CSG_Type=11, then there is no CSGID.

7 Proposed Text (2/2) Page 545, line 27, insert the following text as a separate paragraph. 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. Page 545, line 32, insert the following text in blue. In addition, 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 AAI_SCN-REQ. When BS receives AAI_SCN-REQ including the BS ID or common identifier of a CSG, the BS may include in AAI_SCN-RSP the other BS IDs belonging to the requested CSG. Page 545, line 52, insert the following text in blue. ……using an AAI_NBR-REQ message. AMS may include the common identifier of the designated CSG femto BSs in the NBR-REQ.