Transcript IEEE C802.16m-09/0787

Femtocell BS detection and optimized femtocell List
Document Number:
IEEE C80216m-09/0787
Date Submitted:
2009-04-24
Source:
Jin Lee, Inuk Jung, Ronny Yongho Kim,
Kiseon Ryu and Jin Sam Kwak
LG Electronics
Feng Xie
ZTE
Email:{jins978,cooper,ronnykim,ksryu}@lge.com
Email : [email protected]
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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and
Background
 HO from Macro BS to femtocell BS
 Without a providing neighbor list (OSG/CSG femtocell BSs) to an AMS,
discovery (scanning) of Femtocell BSs (as target for handover) becomes
difficult.
 Femtocell BSs may reside in different frequencies as a macro BS so it may take a
long time for the AMS to discover and scan those femtocell BSs.
 The scanning overhead of all femtocell BSs (in the neighbor list) is critical for
initial network entry and handover .
 It would be helpful if a macro(serving) BS provides an optimized femtocell list
which only contains femtocell BSs in the vicinity of the AMS.
 Therefore, section 17.5.1 describes that a macro BS can provide accessible
femtocell BS list in the vicinity of the AMS with aid of AMS’s report
containing initially detected femtocell BSs.
Femtocell BS detection and optimized femtocell List
2. Re
Macrocell BS
f1
3. D e
port
l i ve r
Optim
i
foun
d
optim
ze d N
Fem
to
i ze d
eighb
ce l l B
neigh
or Li
st
Fem
to #3
,
Fem
to #4 @f3, CS
G
, @f4
, OS
G
1. Find Femtocell BS #2
during scanning at f1
S(s)
bor l
i st
Femtocell BS #2
f1
4. Scan frequencies and BS
ID(s) in the received list
Femtocell BS #3
f3
Femtocell BS #4
f4
(1) An MS can perform initial scanning with one of possible frequencies.
(2) The MS reports detected Femtocell BS information (BS #2 in f1) from the initial scanning
(3) Since a Macro BS has global knowledge on the Femtocell BSs’ topology, the Macro BS can
provide the MS with the optimized neighbor list (BS #3 in f3, BS #4 in f4) to scan as HO targets.
(4) Since the optimized neighbor list can contain (e.g., BS ID, operating center frequency and system
information etc.) information required for scanning, the MS performs the second step scanning with
the received optimized neighbor list.
Proposed SDD Text
 15.4.2 Femtocell BS detection
An MS can perform initial scanning for femtocell BS(s) with one of
possible frequencies. The MS reports detected femtocell BS list to the
serving macro BS. Based on the MS’s report, the macro BS provides
the MS with an optimized femtocell BS(s) neighbor list which
contains information of accessible femtocell BS(s) in the vicinity of
MS. Then the MS performs the second step scanning with the
received optimized neighbor list for access or handover decision.
 15.5.1 HO from Macro BS to Femtocell BS
…
An MS may scan and report information of surrounding Femtocell
BS(s) to the macro BS in order to receive the optimized neighbor list
containing information of accessible neighbor CSG/OSG Femtocell
BS(s) in the vicinity of MS .