IEEE C802.16m-09/0817
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Project
IEEE 802.16 Broadband Wireless Access Working Group <http://ieee802.org/16>
Title
Network Entry in Multi-Carrier Operation - SDD Text Proposal
Date
Submitted
2009-04-24
Source(s)
Jan Suumaki,
Roberto Albanese,
Zexian Li
Nokia
jan.suumaki@nokia.com
roberto.albanese@nokia.com
zexian.li@nokia.com
Xin Qi
NSN
Re:
xin.qi@nsn.com
Category: SDD-Comments / Area: Chapter 17 (Multi-Carrier)
Call for Comments on 802.16m SDD (802.16m-09/0021)
Abstract
Change proposals for the multicarrier operation - clarifications and corrections to network entry
Purpose
For review and adoption into 802.16m System Description Document
Notice
Release
Patent
Policy
This document does not represent the agreed views of the IEEE 802.16 Working Group or any of its subgroups. It
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.
The contributor grants a free, irrevocable license to the IEEE to incorporate material contained in this contribution,
and any modifications thereof, in the creation of an IEEE Standards publication; to copyright in the IEEE’s name
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contributor also acknowledges and accepts that this contribution may be made public by IEEE 802.16.
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Further information is located at <http://standards.ieee.org/board/pat/pat-material.html> and
<http://standards.ieee.org/board/pat>.
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Network Entry in Multi-Carrier Operation - SDD Text Proposal
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Jan Suumaki, Roberto Albanese, Zexian Li
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Nokia,
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Xin Qi
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NSN
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1 Introduction
This contribution proposes changes for the section “17 Support for Multi-carrier Operation” in IEEE 802.16m
System Description Document [1].
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The main focus of this contribution is on the network entry.
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2 Network Entry for Multi-Carrier Operation
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SDD section 10.8 Network Entry defines the following phases:
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“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.”
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Pre-authentication capability negotiation should include only minimum set of parameters which are required to
perform authentication. Because pre-authentication capability negotiation as such is unsecure, there is
mechanism to verify integrity of negotiation -> Capabilities negotiated during pre-authentication capability
negotiation are also included into key agreement management messages for ensuring integrity of capabilities.
Both AMS and ABS will check capabilities sent during pre-authentication phase against capabilities sent during
key agreement phase (key agreement is integrity protected with CMAC). If there are differences, then
capabilities are modified unintentionally (e.g. bit error in air interface) or intentionally (e.g. adversary has
modified capabilities to weaken security)
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This will add overhead, thus there should be minimum amount parameters during pre-authentication capability
negotiation. Security section in SDD specifies also that only security related capabilities may be negotiated
during pre-authentication capability negotiation phase.
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Section 10.6.2 Authentication defines the following
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“Authentication is executed during initial network entry after pre-authentication capability negotiation. Security
capabilities, policies etc. are negotiated in this pre-authentication capability negotiation. The remaining AMS
capability negotiation is performed together with registration after the successful completion of the
authentication and the authorization.”
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Thus multi-carrier capabilities and configuration should be negotiated after authentication, i.e. in capability
exchange and registration phase, i.e. within REG-REQ/RSP messages, see below.
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Because the secondary carrier assignment can happen only after multi-carrier capability negotiation, the
secondary carrier shall be made only after initial network entry.
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In re-entry cases there are no benefits to make carrier assignment during network re-entry, because the time
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difference is so small.
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So excluding secondary carrier assignment during network (re-)entry will simplify multi-carrier design.
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3 Text Proposal
---------------------------------------------------------Start of the Text----------------------------------------------------------
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17.4.3 Initial Entry
The AMS attempts initial ranging and network entry only with a fully configured carrier. An AMS needs to
know which carrier(s) of the ABS are fully configured carriers.
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The AMS may omit UL ranging (for time/frequency synchronization and power adjustment purpose) with
secondary carrier. In this case, AMS uses the same timing, frequency and power adjustment information for the
secondary carrier as in the primary carrier. The AMS may perform fine timing/frequency/power adjustment on
the secondary carrier through measuring the sync channel and/or pilot on the secondary carrier. The AMS may
perform UL ranging with secondary carrier. In this case, power adjustment results in the primary carrier may be
used as initial transmission power for UL ranging over the secondary carrier and the ranging resource for
synchronized AMS is used. Initial ranging on the secondary carrier is directed by the ABS. For this, the ABS
may assign the dedicated ranging code through the primary carrier to enhance the ranging in the secondary
carrier.
----------------------------------------------------------End of the Text----------------------------------------------------------
The ABS may use a preamble sequence selected from a predefined set of sequences reserved for partially
configured carriers. By detecting a preamble sequence designated for partially configured carrier the AMS skips
that carrier and proceed with scanning and selection of alternative carrier.
Once the AMS detects the A-PREAMBLE on a fully configured carrier, the AMS may proceed with reading
SFH or Extended system parameters and system configuration information where the ABS indicates its
configuration and its support for multicarrier feature. The AMS can decide on proceeding with network entry
with the current carrier or going to alternative carriers based on this information.
Once a candidate primary carrier is determined the initial network entry procedures are the same as in single
carrier mode. Multi-carrier capabilities and configurations, such as carrier aggregation or carrier switching mode
support, are negotiated during capability exchange and registration phase. The carrier on which the AMS
successfully performs initial network entry becomes the primary carrier of the AMS. The ABS may also provide
configuration parameters of other carriers to the AMS. After initial network entry the ABS may assign
secondary carriers to the AMS, through negotiation with the AMS.
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4 References
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[1] The Draft IEEE 802.16m System Description Document, IEEE 802.16m-08/003r8
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