Design format of AAI_NBR-ADV message in 802.16m
Document Number: IEEE C802.16m-09/2007
Date Submitted: 2009-08-30
Source:
Re:
Venue:
Inuk Jung
cooper@lge.com
Kiseon Ryu
Ronny Yongho Kim
LG Electronics
ksryu@lge.com
ronnykim@lge.com
Call for Letter Ballot 30
IEEE Session#63, Jeju
Base Contribution: None
Purpose: For member’s review and adoption into P802.16m_D1
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Neighbor BS System information
◙
AMS needs to acquire system information of neighbor BSs for fast
network re-entry during HO (SP1,2,3 and ABI)
◙
Two approaches

Contain all NBR-SI (Neighbor System Information) in NBR-ADV
•
•
Pros: Very simple and no extra actions needed by AMS
Cons:
–
–

NBR-ADV size may get very large.
Since SP are in IE format, information very inefficiently encoded (full bitmaps)
Partial NBR-SI information gathering
•
•
•
Include essential system information for all neighbor BSs (scanning related)
Distribute neighbor BS system information (non-scanning related) by optionally
including full or partial sub-sets of system information in NBR-ADV.
Remaining system information can be requested through AAI_NBR-REQ.
Contents of AAI_NBR-ADV
◙
◙
Essential system information required for scanning











AAI_NBR-ADV change count
number of total cell types
segment information for this AAI_NBR-ADV message
system information of ABSs from one or more cell types, which is of variable size
FA information
BW information
Duplex mode
MAC protocol version
Index of neighbor ABS in the whole neighbor list maintained by serving ABS
48bit BS-ID
ABS A-Preamble index
Remaining system information may be given fully or partially

Indication whether fully, partially or no system information shall be included
[2 bit]
•
•
•
SFH information
ESI information
Index to MC configuration
Contents of AAI_NBR-ADV
◙
Remaining system information may be given fully or partially

Indication whether fully, partially or no system information shall be included (2bit)
•
•
•
◙
SFH information
ESI information
Index to MC configuration
Hence 3 Groups can be formed [2 bit indicator]
- 0b00: Reserved
- 0b01: Neighbor BSs given with essential and full system information
- 0b10: Neighbor BSs given with essential and partial system information
- 0b11: Neighbor BSs given only essential system information
◙
For each group, the BSs may be further categorized by






ABS type (macro, micro, femto, relay, TBD)
carrier frequency
MAC version
TDD/FDD and related definitions (expected to be the same given carrier frequency)
BW, CP info: may not be required if carried in P/S-SCH channel
Multi-carrier capability and configuration
Prioritized BS inclusion in NBR_ADV
◙
Among the Neighbor BSs, the system information of each neighbor BS
is included in prioritized manner in terms of high probability of HO
◙
Neighbor BSs that AMS have high probability to HO to are included in
AAI_NBR-ADV with full system information

◙
Others with lower priority of HO may be provided with partial system
information (reduced overhead)

◙
No indication of partial system information inclusion needed
Indication required
Neighbor BSs with almost no probability are provided with only
essential system information

No indication needed
General NBR-ADV msg format
◙
The NBR-SI (system information) indicator [2 bit]




◙
◙
For each group the BSs may be further categorized in terms of cell
type of other
Indicator bitmap [5 bit] that shows what system information is included
or omitted is now required only for 0b10 case





◙
0b00: Reserved
0b01: BSs with essential and full system information
0b10: BSs with essential and partial system information
0b11: BSs with only essential system information
Bit #1: SP1
Bit #2: SP2
Bit #3: SP3
Bit #4: MC configuration
Bit #5: ESI
Indicator bitmap not needed for 0b01 and 0b11
Partial NBR-SI gathering
◙ Remaining partial system information not included in NBRADV can be acquired by NBR-REQ, during scanning, HO
preparation or directly from target ABS upon network reentry
◙ In case of NBR-SI request, in each request message
(SCN-REQ, HO-REQ, RNG-REQ), AMS may include the
change count, if available, and indicator that relates to the
requesting system information set.
◙ The ABS then may provide the requested NBR-SI in the
corresponding response message
Proposed text
Remedy #1
On the 80216m_D1, page 58 line 42, add proposed text in 15.2.6.10 as follows:
---------------------------------------------------- Start of Text -----------------------------------------------------------15.2.6.10 AAI_NBR-ADV
…
Within each cell type, a list of ABSs are provided and the following parameters are carried for each ABS
- Index of neighbor ABS in the whole neighbor list maintained by serving ABS
- 48bit BS-ID
- ABS A-Preamble index
- indication whether full system information or partial information is carried for this ABS, which includes
- SFH information
- ESI information
- Index to MC configuration,
where for macrocell type, all the necessary system information shall be included, and the format may only carry
delta information fields with respect to the reference ABS(e.g., the serving BS or the first BS/ABS in this cell type).
Based on the provided amount of system information, the list of ABSs shall be categorized into three groups. The
system information group indicate each group as follows:
- 0b00: Reserved
- 0b01: BS group with full system information
- 0b10: BS group with partial system information
- 0b11: BS group with only essential system information (required only for scanning)
---------------------------------------------------- End of Text ------------------------------------------------------------
Proposed text
Remedy #2
On the 80216m_D1, page 87 line 5, add current text in 15.2.7.1.1 with the proposed text as follows:
---------------------------------------------------- Start of Text -----------------------------------------------------------15.2.7 MAC HO procedures
15.2.7.1 Network topology acquisition
15.2.7.1.1 Network topology advertisement
An ABS shall periodically broadcast the system information of the neighboring ABSs using an AAI_NBR-ADV
message. A broadcast AAI_NBR-ADV message shall not include information of neighbor Closed Subscriber
Group (CSG) femtos. Special handling of neighbor information of femto is described in section 15.2.x.
A serving ABS may unicast the AAI_NBR-ADV message to an AMS. The AAI_NBR-ADV message may include
parameters required for cell selection e.g., cell load and cell type. The ABS may broadcast different fragment of
AAI_NBR-ADV independently.
Within the AAI_NBR-ADV message, the list of neighbor BSs shall be categorized in terms of provided system
information amount. The group indicator informs the AMS of BS groups with full system information, partial
system information and only essential system information.
Each group may be further sorted according to their deployment types defined in 15.2.6.10.
---------------------------------------------------- End of Text ------------------------------------------------------------