IEEE C80216m-09_1666
Project
IEEE 802.16 Broadband Wireless Access Working Group <http://ieee802.org/16>
Title
Proposed Changes/Refinements to the Section 10.8 network entry of IEEE 802.16m SDD
Date
Submitted
2009-08-20
Source(s)
Youngkyo Baek
Rakesh Taori
Jungje Son
Samsung Electronics
youngkyo.baek@samsung.com
sassan.ahmadi@intel.com
Sassan Ahmadi
Intel corporation
Re:
Change Request on 802.16m SDD, IEEE 802.16m-09/0034,
Abstract
The contribution proposes text changes to Section 10.8 network entry of IEEE 802.16m SDD.
Purpose
To be discussed and adopted by TGm for use in the IEEE 802.16m SDD
Notice
Release
Patent
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1
IEEE C80216m-09_1666
Proposed Changes/Refinements to the Section 10.8 network
entry of IEEE 802.16m SDD
Youngkyo Baek, Rakesh Taori, Jungje Son
Samsung Electronics
Sassan Ahmadi
Intel corporation
Introduction
This contribution proposes text changes to Sections 10.8 Network entry of the IEEE 802.16m SDD [1] where the system description
requires clarification or additional detail. The proposed text is consistent with the P802.16m/D1 [2]. The refined SDD document will
be a necessary supplement in the submission of IEEE 802.16m technology description template to ITU-R/WP 5D later this year.
For technical changes, P802.16m/D1 [2] text that has been added into the SDD has been specifically identified by section number.
Proposed text has been underlined in blue and deleted text has been struck through in red. Existing SDD text is shown in black.
References
[1] IEEE802.16m System Description Document(SDD), IEEE 802.16m-09/0034, July 2009.
[2] P802.16m Part 16: Air Interface for Broadband Wireless Access Systems (Advanced Air Interface), P802.16m/D1 July 2009.
Proposed Text
Modify the text as follows.
--------------------------------------------- Start of Proposed text -------------------------------------------------------------10.8 Network Entry
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 acquires the DL PHY synchronization synchronizes with the ABS via Advanced Preamble (A-PREAMBLE).
 AMS obtains necessary information including DL/UL parameters( e.g. ABS ID, NSP ID for initial network entry) from
superframe header(SFH) and some broadcast messages, and performs network selection.
 AMS starts initial ranging process.
 Perform pre-authentication capability negotiation.
 Perform AMS Authorization/Authentication and key exchange.
 Perform cCapability exchange and registration.
 AMS enters Advanced WirelessMAN-OFDMA network and sets up service flows.
Neighbor BSs search is based on the same downlink signals as initial network search (eg e.g.: A-preamble) except some information
can be provided by serving ABS (eg e.g.: NBR-ADV). Network re-entry from such procedures as handover, idle mode exit and so on,
is based on initial network entry procedure with certain optimization procedures.
Ranging is the process of acquiring the correct timing offset, frequency offset and power adjustments so that the AMS's transmissions
are aligned with the ABS receive frame, and received within the appropriate reception thresholds.
An AMS that wishes to perform initial ranging takes the following steps:
 The AMS selects one Ranging Slot using the random backoff. After selecting the Ranging Slot, the AMS shall choose a
ranging sequence and sends it to the ABS in the selected Ranging Slot.
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IEEE C80216m-09_1666




The ABS responds with an AAI_RNG-ACK message, which provides responses (e.g.. needed adjustment, ranging status,etc.),
to all the successfully received and decoded IR requests in initial ranging slots in a previous UL subframe, in a predefined,
subsequent DL subframe.
Upon receiving a continue status notification and parameter adjustments, the AMS adjusts its parameters accordingly and
continue the ranging process
Upon receiving a success status notification, the AMS waits for the ABS to provide UL BW allocation. When receiving an
UL BW allocation, the AMS sends the AAI_RNG-REQ message.
Initial ranging process is over after receiving AAI_RNG-RSP message, which includes a temporary STID to be used until
STID is received at successful registration.
Immediately after completion of ranging, the AMS negotiates pre-authentication capabilities with ABS, which are required for AMS
authorization/authentication and key exchange.
If PKM is enabled in pre-authentication capability negotiation, the ABS and AMS shall perform authorization and key exchange. If
this procedure completes successfully, all parameters for TEK generation are shared, and TEKs are derived at each side of AMS and
ABS.
After authorization and key exchange are finished, the AMS informs the ABS of its remaining capabilities and requests the
registration for entry into the network by AAI_REG-REQ. If an ABS receives an AAI_REG-REQ, the ABS shall respond with
AAI_REG-RSP.
The ABS shall allocate and transfer a STID to the AMS through encrypted AAI_REG-RSP message if management message
encryption is supported. The temporary STID, which was allocated during initial ranging procedure, is discarded when the ABS
recognizes that the AMS received the AAI_REG-RSP messages successfully.
Upon successful registration, service flows are setup for upper layer signalling.
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 for RNGREQ) can be linked to the corresponding bit of the status indication message to reduce overhead.
--------------------------------------------- End of Proposed text----------------------------------------------------------
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