CSG cell bar in Femto ABS (15.4.7.2)
Document Number: IEEE C802.16m-09/1838
Date Submitted: 2009-08-29
Source:
Jin Lee, Ronny Kim, Kiseon Ryu, Jinsam Kwak
Email : {jins978,ronnykim,ksryu}@lge.com
LG Electronics
Re:
P802.16m/D1
Venue:
IEEE Session#63, Jeju in Korea
Base Contribution:
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 resource are being consumed by CSG users, the CSG-Open femto
ABS should broadcast or unicast CSG cell bar bit set to ‘1’ or ‘on’
respectively (means, prevention of NE from non CSG AMS) .
Proposal
• Option 1
– Broadcast CSG cell bar via SFH
Subscriber type
Condition
Value
OSG
N/A
*Always set to 0
CSG-Closed
N/A
*If CSG cell bar bit =1, this cell is
not allowed for any new initial
entry/HO from non CSG AMS.
*Always set to 1
CSG-Open
CSG 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 ‘on’)
If CSG cell bar set to ‘on’, the AMS
shall stop network entry to the CSGOpen Femto ABS.
Proposal
• Option 3
– Identify the meaning of cell bar in CSG-Open Femto ABS differently
– If cell bar bit is set to 1 in CSG-Open Femto ABS, non authorized
member AMS should not access network entry and HO to the CSGOpen Femto ABS.
Proposed Texts
[Insert texts as suggested [in red] below in Page 492 Line51]
15.4.7.2 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 CSG 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 ‘on’ during
network entry, the non CSG AMS should stop network entry procedure to the CSG-Open
Femto ABS.
[Option3]
CSG-Open Femto ABS prevents non CSG AMS from network entry or HO by setting cell bar set
to 1 when most of its resources are consumed by CSG AMS.