CSG cell bar in Femto ABS (15.4.7.3)
Document Number: IEEE C802.16m-09/2404
Date Submitted: 2009-11-05
Source:
Jin Lee, Ronny Kim, Kiseon Ryu, Jin Sam Kwak
LG Electronics
Email : {jins978,ronnykim,ksryu}@lge.com
Re:
IEEE 802.16 Working Group Letter Ballot#30a
Venue:
IEEE Session#64, Atlanta
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Purpose: Discussion and adoption by TGm
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CSG cell bar in CSG-Open Femto ABS
• Motivation
– By definition of CSG-Open Femto ABS [WiMAX requirement], when
resources are not being consumed by CSG users, those resources are
made available to the service provider’s other users (Non CSG member
but authorized AMSs) or roaming users.
– Then, when most of its resources are being used by CSG AMS, CSGOpen Femto ABS shall protect non CSG AMS from network entry/HO.
– However, usage of resources are quite variable resting upon the number
of connected CSG users or traffic etc.
– Therefore, we propose CSG cell bar which indicates prevention of
network entry for non CSG AMS in a CSG-Open Femto ABS when a
certain condition is met.
• For example, in CSG-Open femto ABS,
– If most of resources are being consumed by CSG users, the CSG-Open femto
ABS should broadcast or unicast CSG cell bar bit set to ‘1’ (means, prevention
of NE from non CSG AMS) .
Proposal
• Option 1
– Identify the meaning of the existing cell bar in CSG-Open Femto ABS
differently
– If the cell bar bit is set to 1 in CSG-Open Femto ABS, non authorized
member AMS should not access network entry and handover to the
CSG-Open Femto ABS.
Subscriber type
Condition
Value
CSG-Open
Cell bar bit is set when most
of resources are being used
by CSG AMS
* If cell Bar bit =1, this cell is
not allowed for non CSG AMSs
to any new initial entry/HO
Proposal
• Option 2
– Unicast CSG cell bar via AAI_RNG-RSP in CSG-Open Femto ABS
Femto BS
(CSG-Open)
AMS
(Non-CSG member)
Resource
Exhausted
A-Preamble / SFH
Ranging code
AAI_RNG-ACK
AAI_RNG-REQ
AAI_RNG-RSP
(CSG cell bar set to ‘1’)
If CSG cell bar set to 1, the AMS shall
stop network entry to the CSG-Open
Femto ABS.
Proposed Texts
[Insert texts as suggested [in red] below in Page 548 Line53]
15.4.7.3 Femto ABS Access Restrictions
AMS shall not attempt to access or initiate handover to a CSG-closed femto ABS, if
such an AMS is not included in the Femto ABS CSG, except in case of emergency
call or manual Femto BS selection. CSG-Open Femto ABS prevents non CSG AMS
from network entry or HO when most of its resources are consumed by CSG AMS.
[Option1]
If cell bar indication in CSG-Open Femto ABS is set to 1, an AMS which does not
belong to the CSG-Open Femto ABS’s CSG shall not attempt network entry or
handover while an AMS which belongs to the femto ABS’s CSG is still allowed
network entry or handover.
[Option2]
If non CSG AMS receives an AAI_RNG-RSP including CSG cell bar bit set to 1 during
network entry, the non CSG AMS should stop network entry procedure to the
CSG-Open Femto ABS.