Support of Emergency Alert in 802.16m (AWD-15.2)
IEEE 802.16 Presentation Submission Template (Rev. 9)
Document Number:
IEEE C802.16m-09/1554
Date Submitted:
2009-07-06
Source:
Kanchei (Ken) Loa, Chiu-Wen Chen, Chun-Yen Hsu,
Youn-Tai Lee, Yi-Ting Lin, Tsung-Yu Tsai
Institute for Information Industry (III)
Whai-En Chen, Shih-Yuan Cheng
National Ilan University (NIU)
Chih-Cheng Yang
National Central University (NCU)
E-mail: loa@iii.org.tw
Venue:
IEEE 802.16 Plenary, Session #62, San Francisco, California, USA
AWD-15.2; in response to the TGm Call for Comments and Contributions 802.16m-09/0028r1 for Session 62
Base Contribution:
N/A
Purpose:
For discussion and approval by IEEE 802.16 TGm
Notice:
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contained herein.
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Introductions
• Emergency alert is to deliver the emergency information
such as disaster warning targeted to a specific area
– Emergency alert may reduce the risk and decrease the damage
– Emergency alert is sent by ABSs
• It includes transmissions of emergency alert indicator and emergency
information
– The FCC requires disaster recovery maintenance, testing,
prevention, emergency procedures, and recovery strategies
for the timely resumption of essential services during
emergencies
Introductions
• The issue is: How to alert the AMSs effectively?
• In this contribution, an emergency alert procedure is
proposed to notify all AMSs the imminent disaster
• The concept of emergency alert procedure
– The emergency information is broadcasted
• All AMSs in connected state will receive the emergency information
– The emergency indicator is used to notify AMSs in idle
state the transmissions of emergency information
• AMSs in idle state will receive the emergency information in
addition to paging message
Emergency alert indicator
• Emergency alert indicator in the P-SFH
Syntax
Size
(bit)
Notes
P-SFH IE format () {
LSB of Superframe number
4
System Configuration Description
change count
4
S-SFH Size
4
The units of LRU
S-SFH Transmission Format
2
Indicate the transmission format (repetition) used for
S-SFH.
S-SFH Scheduling information bitmap
3
0b000: no S-SFH
If 1st bit =1, S-SFH includes SP1 otherwise no SP1
If 2nd bit =1, S-SFH includes SP2 otherwise no SP2
If 3rd bit =1, S-SFH inckudes SP3 otherwise no SP3
S-SFH SP change bitmap
3
Emergency alert indicator
1
Reserved
}
TBD
Part of superframe number
If this indicator is set to 1, each AMS shall decode the
A-MAP for obtaining the emergency information.
Emergency alert indicator
• Emergency alert indicator is included in the PSFH because:
– P-SFH is transmitted in every superframe
– In Idle state, during paging listening interval, the
AMS shall scan and synchronize with the APREAMBLE of its preferred ABS and decode the
P-SFH of the ABS at the beginning of the paging
listening interval
Emergency information
• Upon receipt of the emergency alert indicator that
is set, all AMSs shall decode the A-A-MAP to
obtain the emergency information
– Transmissions of emergency information shall be
indicated in the A-A-MAP using the pre-defined
broadcast or multicast STID
– The idle AMS shall decode the A-A-MAP for
obtaining the emergency information after
receiving of the emergency alert indicator in the PSFH whether it is paged or not
Emergency alert procedure
A-Preamble
Emergency alert indicator
A-A-MAP
SFH
Emergency information
t
•
•
•
•
The AMSs shall synchronize with the A-PREAMBLE
Decode the P-SFH (with emergency alert indicator)
Receive the paging message (for idle AMSs only)
Receive the emergency information indicated in the AA-MAP with the pre-defined broadcast or multicast
STID
Proposed text for the 802.16m AWD
• [Modify the following text in Line 37, Page 8 as
indicated:]
• 15.2.1.2.1 Station Identifier (STID)
The ABS assigns a 12 bits long STID to the AMS
during network entry, and, in some cases, network
re-entry, that uniquely identifies the AMS within
the domain of the ABS. Each AMS registered in
the network has an assigned STID. Some specific
“STIDs” are reserved, for example, for broadcast,
multicast, emergency alert, and ranging.
Proposed text for the 802.16m AWD
• [Insert the following text in Line 55, Page 100 as
indicated:]
• 15.2.17.2.3 Operation during paging listening interval
At the beginning of the paging listening interval, the AMS
shall scan and synchronize on the A-PREAMBLE of its
preferred ABS and decode the P-SFH of the ABS. Upon
receiption of the emergency alert indicator that is set, the
AMS shall decode the A-A-MAP to obtain the emergency
information.
Proposed text for the 802.16m AWD
• [Modify Table 661 in the 802.16m-09/0010r2 as indicated:]
•
Table 661—P-SFH IE format
Syntax
Size
(bit)
Notes
P-SFH IE format () {
LSB of Superframe number
4
System Configuration Description
change count
4
S-SFH Size
4
The units of LRU
S-SFH Transmission Format
2
Indicate the transmission format (repetition) used for
S-SFH.
S-SFH Scheduling information bitmap
3
0b000: no S-SFH
If 1st bit =1, S-SFH includes SP1 otherwise no SP1
If 2nd bit =1, S-SFH includes SP2 otherwise no SP2
If 3rd bit =1, S-SFH inckudes SP3 otherwise no SP3
S-SFH SP change bitmap
3
Emergency alert indicator
1
Reserved
}
TBD
Part of superframe number
If this indicator is set to 1, each AMS shall decode the
A-MAP for obtaining the emergency information.