IEEE C802.16m-09/0975
Project
IEEE 802.16 Broadband Wireless Access Working Group <http://ieee802.org/16>
Title
AWD New Contribution on Network Entry
Date
Submitted
2009-04-27
Source(s)
Kelvin Chou, Yih-Shen Chen, I-Kang Fu
and Paul Cheng
Kelvin.Chou@mediatek.com
MediaTek Inc.
Re:
Category: AWD-New contribution / Area: Network Entry
“AWD New Contribution on Network Entry”
Abstract
This contribution proposes IEEE 802.16m AWD text on the network entry.
Purpose
Propose to be discussed and adopted by TGm for the 802.16m AWD
Notice
Release
Patent
Policy
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represents only the views of the participants listed in the “Source(s)” field above. It is offered as a basis for
discussion. It is not binding on the contributor(s), who reserve(s) the right to add, amend or withdraw material
contained herein.
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and any modifications thereof, in the creation of an IEEE Standards publication; to copyright in the IEEE’s name
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<http://standards.ieee.org/guides/opman/sect6.html#6.3>.
Further information is located at <http://standards.ieee.org/board/pat/pat-material.html> and
<http://standards.ieee.org/board/pat>.
AWD New Contribution on Network Entry
Kelvin Chou, Yih-Shen Chen, I-Kang Fu and Paul Cheng
MediaTek Inc.
I. Proposed Text
--------------------------------------------- Text Start ---------------------------------------------------------------
1
IEEE C802.16m-09/0975
15.2.x Network Entry
{NOTE: The following text is copied from SDD.}
Network entry is the procedure by which an AMS finds and establishes a connection with the network. The
network entry has the following steps:
–
AMS synchronizes with the ABS via Advanced Preamble (A-PREAMBLE).
–
AMS obtains necessary information e.g. ABS ID, NSP ID for initial network entry, and performs
network selection.
–
AMS starts ranging process.
–
Pre-authentication capability negotiation.
–
Authentication.
–
Capability exchange and registration.
–
AMS enters Advanced WirelessMAN-OFDMA network and sets up service flows.
Neighbour ABSs search is based on the same downlink signals as initial network search (e.g.: preamble) except
some information can be provided by serving ABS (e.g.: NBR-ADV).
The ABS responds to the AMS’ initial ranging code transmission by broadcasting a status indication message
(e.g.: Decoding Status Bitmap) in a following predefined DL frame/subframe. The initial ranging related
messages (e.g.: RNG-RSP and BW Grant) can be linked to the corresponding bit of the status indication
message to reduce overhead.
15.2.x.1 Network entry and initialization
{NOTE: The following text and figure are modified from R2/D9, p318. Modifications of the figure are marked
by blue with underscores.}
The procedure for initialization of an AMS shall be as shown in Figure xx1. This figure shows the overall flow
between the stages of initialization in an SS. This shows no error paths and is shown simply to provide an
overview of the process.
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IEEE C802.16m-09/0975
Scan for
DL control channel of
each carrier
DL
synch. with a
candidate
established
SS authentication
and
key exchange
Allow NW entry in
candidate carrier?
SS
authentication
complete
NO
Transfer operational
parameters
Yes
Obtain
UL parameters of the
primary carrier
UL
Parameters
acquired
Ranging & automatic
adjustments in the
primary carrier
Register
with
ABS and multi-carrier
capabilities
Registration and
multi-carrier
capabilities
negotiation
complete
Establish IP
connectivity
Transfer
complete
Establish
provisioned
connections
Enable multi-carrier
operation?
Yes
Ranging & automatic adjustments complete
IP
complete
BS informs PHY
parameters of
secondary carriers
NO
Negotiate
basic capabilities
Establish time of day
Ranging in secondary
carriers if necessary
Basic capabilities
negotiated
Time of day
established
Operational
Figure xx1 – AMS initialization overview
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IEEE C802.16m-09/0975
15.2.x.2 Contention-based initial ranging and automatic adjustments
{NOTE: The following text is modified from R2/D9, p353. Modifications are marked by blue with underscores.}
An AMS that wishes to perform initial ranging shall take the following steps:
— The AMS, after acquiring downlink synchronization and uplink transmission parameters, shall select one
Ranging Slot using the random backoff. The random backoff shall use a binary truncated exponent algorithm.
After selecting the Ranging Slot, the AMS shall choose a Ranging Code (from the Initial Ranging domain)
using a uniform random process. The selected Ranging Code is sent to the ABS (as a CDMA code) in the
selected Ranging Slot.
— The ABS broadcasts a decoding status indication message (detail format TBD), which indicates the decoding
status of previous initial ranging opportunity. If the AMS finds in the status indication message that no initial
ranging code has been successfully decoded in the ranging slot selected by the AMS, the AMS considers its
ranging request is failed and restarts the initial ranging procedure. Otherwise the AMS continues waiting for the
AAI_RNG-RSP message. The status indication message may also piggyback content of the AAI_RNG-RSP
message or CDMA Allocation A-MAP IE for the AMS of successfully decoded CDMA ranging code.
— The ABS cannot tell which AMS sent the CDMA ranging request; therefore, upon successfully receiving a
CDMA ranging code, the ABS broadcasts a AAI_RNG-RSP message which is identified by a RAID (Random
Access ID) derived from a TBD function of the received ranging code as well as the ranging slot (OFDMA
symbol number, subchannel, etc. Attributes are TBD in 16m) where the CDMA ranging code has been
identified. This RAID is used by the AMS that sent the CDMA ranging code to identify the AAI_RNG-RSP that
corresponds to its ranging request. The AAI_RNG-RSP message contains all the needed adjustment (e.g., time,
power, and possibly frequency corrections) and a status notification.
— Upon receiving a AAI_RNG-RSP message with Continue status, the AMS shall continue the ranging process
as done on the first entry (using random selection rather than random backoff) with ranging codes randomly
chosen from the initial ranging domain sent on the periodic ranging region.
— When the ABS receives an initial-ranging CDMA code that requires no corrections, the ABS shall provide
BW allocation for the AMS using the CDMA_Allocation_A-MAP_IE to send a AAI_RNG-REQ message.
Sending the AAI_RNG-RSP message with status “Success” is optional.
— Initial ranging process is over after receiving AAI_RNG-RSP message, which includes a valid Basic CID
(following a AAI_RNG-REQ transmission on a CDMA Allocation A-MAP IE). If this AAI_RNG-RSP message
includes “continue” indication, the ranging process should be continued using the periodic ranging mechanisms.
— If the AAI_RNG-RSP includes an Offset Frequency Adjustment pointing to another channel and it is larger
than the value required for a channel bandwidth offset, the AMS should synchronize with the new channel
indicated in the AAI_RNG-RSP.
— The timeout required for AMS to wait for AAI_RNG-RSP, following or not following CDMA Allocation AMAP IE, is defined by T3.
The message sequence chart (Table xx1) defines the CDMA initial ranging and adjustment process that shall be
followed by compliant AMSs and ABSs.
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IEEE C802.16m-09/0975
{NOTE: The following table is modified from R2/D9, p354, table 138. Modifications are marked by blue with
underscores.}
Table xx1 – CDMA initial ranging and automatic adjustments procedure
ABS
AMS
[Time to send the CDMA initial ranging
opportunity]
Send A-Map containing ranging region with
a Broadcast Connection ID
---------------- A-MAP --------------->
<------------- Ranging code -----------
Transmit randomly selected initial ranging
code in a randomly selected ranging slot from
available ranging region
[Receive ranging code]
Send decoding status indication message to
indicate the decoding status of previous
initial ranging opportunity.
------ Status indication message ----->
Status = Detected initial ranging code(s)
Receive Status indication message which
indicates some initial ranging codes has been
detected in the selected ranging slot. Continue
waiting for possible AAI_RNG-RSP destined
to this AMS
Send AAI_RNG-RSP with time and power
corrections and original ranging code and
ranging slot
----------- AAI_RNG-RSP ---------->
Status = Continue
Receive AAI_RNG-RSP message with ranging
code and ranging slot matching sent values
Adjust time and power parameters
[Time to send the CDMA initial ranging
opportunity]
Send A-Map containing ranging region with
a Broadcast Connection ID
---------------- A-MAP --------------->
<------------- Ranging code -----------
Transmit randomly selected initial ranging
code in a randomly selected ranging slot from
available periodic ranging region
[Receive ranging code]
Send decoding status indication message to
indicate the decoding status of previous
initial ranging opportunity.
------ Status indication message ----->
Status = Detected initial ranging code(s)
Receive Status indication message which
indicates some initial ranging codes has been
detected in the selected ranging slot. Continue
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IEEE C802.16m-09/0975
waiting for possible AAI_RNG-RSP destined
to this AMS
Send AAI_RNG-RSP with time and power
corrections and original ranging code and
ranging slot
----------- AAI_RNG-RSP ---------->
Status = Success
Receive AAI_RNG-RSP message with ranging
code and ranging slot matching sent values
Adjust Time and Power parameters
[Time to send the next map]
Send A-Map containing anonymous
bandwidth allocation with original ranging
code and ranging slot
---------------- A-MAP --------------->
<----------- AAI_RNG-REQ ----------
Transmit AAI_RNG-REQ and continue with
regular Initial network entry
[Time to send the CDMA initial ranging
opportunity]
Send A-Map containing ranging region with
a Broadcast Connection ID
---------------- A-MAP --------------->
<------------- Ranging code -----------
Send decoding status indication message to
indicate the decoding status of previous
initial ranging opportunity.
Transmit randomly selected initial ranging
code in a randomly selected ranging slot from
available ranging region
------ Status indication message ----->
Status = No initial ranging code is detected
Receive Status indication message which
indicates no initial ranging code has been
successfully decoded in the selected ranging
slot. Restart the initial ranging procedure.
---------------------------------------------- Text End ---------------------------------------------------------------
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