Abnormal Outage Report in 802.16p
Document Number:
IEEE C802.16p-10/0032
Date Submitted:
2010/12/31
Source:
Hung-Yu Wei, Ching-Chun Chou
E-mail: hywei@cc.ntu.edu.tw
National Taiwan University (NTU)
*<http://standards.ieee.org/faqs/affiliationFAQ.html>
Re:
802.16p amendment text
(CfC: Project 802.16p Amendment Working Document Content)
Base Contribution:
IEEE C802.16p-10/0032
Purpose:
To be discussed and adopted in the AWD by the 802.16p M2M TG
Notice:
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IEEE 802.16p SRD Specifications
• SRD Section 6.2.8 [1]
– The 802.16p system shall have the ability to
distinguish between “normal power down” (e.g.
associated with a voluntary power outage event)
and “abnormal power down” (associated with an
involuntary power outage event).
• A reporting mechanism is required for
abnormal power down.
– Specify the abnormal events, and the normal
power down can be distinguished.
Problem Statement
• Last Gasp alarm [2]
– Large number of smart meters transition from idle
to active state in power outage.
• Notify the network that they have lost power.
• Insufficient ranging opportunity
– 960 VS 70000 access attempts per second [2]
• 32 initial ranging codes, 200 channels/second
=> 1% contention probability: 960 access/second
• 35K device/sector, 500ms access interval
=> 70000 access/second
Proposed Solution
• M2M_Abnormal_Outage ranging code
– An code for abnormal outage reporting
• An indicator for abnormal outage
• If the ABS receive this code, the ABS is notified
of the abnormal outage.
– Then the ABS should allocate the ranging
channel for M2M network entry.
• Especially for last gasp.
DL AAI subframes
DL burst #3
DL burst #2
DL burst #0 (UL-MAP)
FCH
Ranging Code:
M2M_Abnormal_Outage
FCH
UL burst #0
UL burst #2
UL AAI subframes
UL burst #1
UL burst #0
M2M network entry channel
(Last Gasp Reporting)
Ranging channel, feedback channel, ACK channel
DL AAI subframes
DL burst #2
DL burst #0 (UL-MAP)
DL burst #3
DL-MAP
Preamble
UL AAI subframes
UL burst #1
Frame #(k)
DL burst #1
UL burst #2
Ranging channel, feedback channel, ACK channel
DL burst #1
DL-MAP
Preamble
Illustration for the Proposed Solution
Frame #(k+1)
Advantages of the Proposed Solutions
• The ranging opportunities can be adaptively
allocated.
– The number of M2M network entry channels
– Utilize the information of Number of users
• The ranging codes can be reused.
– We may reuse the existing ranging codes in M2M
network entry channel.
• No longer limited by the 32 initial ranging codes
• 256 codes, 200 channels => 51200 opportunities
• More ranging channels are available if the number of
M2M network entry channels are increased.
Proposed Text
• 6.3.10.5 M2M Abnormal Power Outage Ranging
– An MS may send M2M Abnormal Outage Ranging Code
which is defined by Type X in Table 571 to notify the BS
of abnormal power outage.
– When the BS responds to an M2M Abnormal Outage
Ranging Code, and PHY corrections are not needed, the BS
shall reserve an M2M network entry channel, specified in
the UL-MAP IE, in the next frame for the M2M network
entry.
– M2M MSs may send a ranging code from M2M Network
Entry Ranging Code Set to perform M2M network entry
• 6.3.10.6 M2M Network Entry Ranging
– TBD.
Proposed Text (cont.)
MS
ABS
Ranging Code for Abnormal Power Outage Report
M2M Abnormal Power Outage
Ranging
Reserve the M2M Network Entry channel for
M2M Network Entry Ranging
Ranging Code from M2M Network Entry Ranging
Code Set for RNG-REQ
………
M2M Network Entry
Ranging
Proposed Text (cont.)
Table 571 – UCD PHY-specific channel encodings-WirelessmanOFDMA
Name
Type
(1 byte)
Length
Value
Start of ranging codes group
155
1
Indicates the starting number, S, of the group of codes used for this UL.
If not specified, the default value shall be set to zero.
All the ranging codes used on this UL shall be between S and
((S+O+N+M+L+K+J+H) mod 256) where
N is the number of initial ranging codes
M is the number of periodic ranging codes
L is the number of BR codes
O is the number of HO ranging codes
H is the number of HO ranging codes in HO Ranging Code set 1
J is the number of BR ranging codes in BR Ranging Code set 1
K is the number of Initial ranging codes in Initial Ranging Code set 1
The range of values is 0≤S≤255.
Initial Ranging Code Set 1
219
1
Number of Initial ranging CDMA codes for soft combining. Possible
values are 0-255. Default value is 0
HO Ranging Code Set 1
229
1
Number of HO ranging CDMA codes for soft combining. Possible
values are 0-255. Default value is 0
BR Ranging Code Set 1
221
1
Number of BR ranging CDMA codes for soft combining Possible
values are 0-255. Default value is 0
Abnormal Power Outage Ranging Code
X
(TBD)
1
An indicator for the M2M MS to notify the ABS of abnormal power
outage.
References
• [1] 802.16p-10/0004r1, “IEEE 802.16p Machine to
Machine (M2M) System Requirements Document
(SRD) (initial working document revised),”Jin Lee,
IEEE 802.16p TG, 2010-11-11
• [2] 802.16p-10/0005, “Machine to Machine (M2M)
Communications Technical Report,” HanGyu Cho,
M2M Technical Report Technical Editor, 2010-11-10