HR-MS Discovers Network Infrastructure with Help from
Forwarding HR-MS: Rationale & Principles
IEEE 802.16 Presentation Submission Template (Rev. 9)
Document Number: IEEE S802.16n-11/0142
Date Submitted: 2011-07-19
Source:
Anh Tuan Hoang, Haiguang Wang, Jaya Shankar,
athoang@i2r.a-star.edu.sg
Zander Zhongding Lei, Wai Leong Yeow,
Shoukang Zheng, Choong Hock Mar
Institute for Infocomm Research
Eldad Zeira
InterDigital
eldad.zeira@interdigital.com
Venue: IEEE 802.16n at session #74
Base Contribution: C802.16n-11/0142 or latest revision
Purpose: To be discussed and adopted by 802.16n
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1
HR-MS Discovers Network Infrastructure with Help from
Forwarding HR-MS
IEEE S802.16n-11/0142
HR-MS use cases
• Used for DC, FTN. One of the HR-MS is associated with
HR-BS or HR-RS.
• Discovery for FTN is non HR-MS specific
• Category A:
– Moderate or high mobility
– Moderate to low number of devices
– PPDR as well as some M2M applications (e.g. vehicle tracking, health
monitoring, etc.).
• Category B:
–
–
–
–
Low mobility
Huge number of devices
Battery consumption could be a big issue
some M2M e.g. Smart Grid applications as well as e.g. static surveillance.
IEEE S802.16n-11/0142
802.16m-like HR-MS discovery principles
Scheduled an integer number of superframes
A
Associated HR-MS
B
C
D
E
1
3
F
Non-Associated
HR-MS
2
G
PA/SA Preamble
“Ranging” Preamble
Colors indicate relationship between stations or signals
Network Connection Info
NCI
Response
IEEE S802.16n-11/0142
802.16m-like HR-MS discovery principles
• Discoverable HR-MS (A-F) transmit preambles (1).
– PA-Preamble or SA-Preamble is HR-MS specific
• Discoverable HR-MS also transmit network access
information (NCI) that could be similar to 802.16m SFH.
– As a minimum the NCI contains the information required for sending a
ranging preamble or other access signal and the information required to
decode the HR-BS response to it.
• Un-associated HR-MS (G) send a ranging preamble (2)
or similar to discoverable HR-MS of choice (F).
– The preamble is ramped up till a response (3) is obtained.
• At this point the normal cell access procedure can be
followed.
IEEE S802.16n-11/0142
Limitations of 802.16m-like cell search
(When applied to category “B”)
• Insufficient code space for preambles e.g. for
reporting (observed for LTE He-Node-B)
• SFH interfere with each other or other HR-BS,
HR-MS transmissions
• 802.16m SFH occupies ~3% of resources (at
5MHz)
IEEE S802.16n-11/0142
Group based HR-MS discovery
Scheduled an integer number of superframes
A
C
Associated HR-MS
B
Common
content NCI
D
E
F
1
5
3
2
4
Non-Associated
HR-MS
Listening resources
G
Parameters
determined from
NAI
PA/SA Preamble
“Ranging” Preamble
Colors indicate relationship between stations or signals
Network Connection
Info NCI
Response
IEEE S802.16n-11/0142
Group based HR-MS discovery
• Discoverable HR-MS (A-F) transmit preambles and NCI (1).
– Groups of HR-MS have SA-Preambles which signifies their group ID perhaps based
on their service characteristics
– NCI is also group-specific
• An un-associated HR-MS (G) sends a ranging preamble (2) or similar to group of
choice (yellow).
• The preamble is ramped up till a response (3) is obtained.
• Due to the ramping, discoverable HR-MS that are nearby will tend to respond first
(e.g. E and F in fig. 2). Therefore there will be fewer responses. Interference is
therefore limited.
• The response consists of group based ACK, followed by HR-MS-specific SAPreamble and NCI.
• The un-associated HR-MS (G) sends new a network access signal (4) (e.g. a
ranging preamble), this time on resources determined from the NCI of the HR-MS
(F) that it chose from (3).
• The associated HR-MS that was chosen responds (5).
• At this point the normal cell access procedure is followed.
IEEE S802.16n-11/0142
Group based HR-MS discovery: Variant
Scheduled an integer number of superframes
A
Associated HR-MS
B
C
D
E
F
1
5
3
2
4
Non-Associated
HR-MS
Listening resources
G
Parameters
determined from
NAI
PA/SA Preamble
“Ranging” Preamble
Colors indicate relationship between stations or signals
Network Connection
Info NCI
Response
IEEE S802.16n-11/0142
Group based HR-MS discovery: Variant
• Very similar to group based except:
– No group based NCI is transmitted
– Ranging and other parameters implied by SAPreamble cell-ID.
• Limited ranging format (e.g. NS-RNG)
• Following information has to be somehow
provided:
– Sub-frame offset for ranging resources
• Can it be fixed across frame types?
– Frequency (i.e. ranging opportunities per frames etc.)
– Code group