Low duty mode in a legacy support femtocell BS
Document Number:
IEEE C80216m-09/0788
Date Submitted:
2009-04-24
Source:
Jin Lee, Sungho Moon, Ronny Yongho Kim,
Kiseon Ryu and Jin Sam Kwak
LG Electronics
Yang Liu
ZTE
Email:{jins978,msungho,ronnykim}@lge.com
Email : liu.yang8@zte.com.cn
Venue:
IEEE 802.16 session #61
Re: “Comments on SDD 15 Femtocell”
Purpose:
Discussion and Approval for IEEE 802.16m SDD Text
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1
Motivation
•
When a CSG femtocell BS supports both an YMS and AMS, frame configuration of
the femtocell BS will be the same as a legacy support macro BS (shown in Fig 1.)
16e
preamble
16e DL
16m
Switching
A-PREAMBLE Point
16m DL
16e
UL
5 ms Radio
Frame
•
16m
16e
preamble A-PREAMBLE
Switching
Point
16e
preamble
Switching
16m
A-PREAMBLE Point
16m UL
5 ms Radio
Frame
5 ms Radio
Frame
Fig 1. Legacy support macro BS
However,
• If none of the CSG YMS exists within the overlay macro BS of its CSG Femtocell
BS,
– Unnecessary access signals occur from non-CSG YMSs in the Lzone
– Inessential 16e signals via Lzone (power consumable and outbreak of interference) are
transmitted
• In case where none of the CSG AMS exist the overlay macro BS of its CSG
Femtocell BS, the non CSG AMSs will keep trying to access the femtocell BS in
the MZone
•
Therefore, a CSG femtocell BS should support low duty mode (defined in SDD 17.7)
of L/MZone separately upon the presence of a CSG YMS/AMS within the overlay
2
macro BS of its CSG Femtocell BS
Low duty mode in a legacy support femtocell BS
 Low duty mode of LZone
 If none of the CSG YMSs are
within the overlay macro BS of
its CSG Femtocell BS,
 Frame configuration would be :
16e
preamble
16m
A-PREAMBLE
16m DL zone
 Low duty mode of MZone
 If none of the CSG AMSs are
within the overlay macro BS of
its CSG Femtocell BS,
 Frame configuration would be :
16m UL zone
5 ms Radio
Frame
Fig 2. Low duty mode of LZone
16e DL
16e
UL
5 ms Radio
Frame
Fig 3. Low duty mode of MZone
 Advantages
 To remove interference to non CSG (Y/A)MSs
 To decrease unnecessary access signaling from non CSG (Y/A)MSs
Usage Scenarios
16e DL
CSG list
16m 16e
DL UL
16m
UL
Macro BS 1
CSG list
16m
DL
16m
UL
111
222
111
222
Macro BS 1
AMS: 111
YMS: 222
AMS: 111
YMS: 222
Case 1
Macro BS 2
16e DL
16e
UL
Macro BS 2
Case 2
Macro BS 1
Macro BS 1
CSG list
CSG list
111
222
111
222
YMS: 222
AMS: 111
Macro BS 2
YMS: 222
Case 3
Case 4
Macro BS 2
AMS: 111
Proposed SDD Text
 15.7 Low –duty Operation Mode
 When an MS leaves or enters the overlay macro BS of its CSG Femtocell BS,
the network may signal the CSG Femtocell BS to enter low-duty operation
mode or normal operation mode, respectively. Handover signaling or location
update signaling may trigger such operation. In case a CSG Femtocell BS
supports both AMS and YMS, the network may signal the CSG Femtocell BS
to stop or start transmission of LZone/MZone when an YMS/AMS leaves or
enters the overlay macro BS of its CSG Femtocell BS respectively.
 The CSG Femtocell BS switches between the low-duty operation mode and
the normal operation mode when it receives requests from the overlay macro
BS, the core network, or an MS for network entry, HO, or the exit of the sleep
mode.The low-duty operation mode shall not impact the support for
emergency service and E911.