One document matched: draft-sekim-802-16-multicast-00.txt
16ng Working Group S-E. Kim
Internet-Draft J-S. Jin
Expires: December 23, 2007 S-C. Lee
S-H. Lee
KT
June 21, 2007
Multicast Transport on IEEE 802.16 Networks
draft-sekim-802-16-multicast-00
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Copyright Notice
Copyright (C) The IETF Trust (2007).
Abstract
This draft proposes multicast transmission over IEEE 802.16 networks.
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Table of Contents
1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . . 3
2. Terminology . . . . . . . . . . . . . . . . . . . . . . . . . 3
3. Link layer format for IEEE 802.16 Network . . . . . . . . . . 4
4. CS Specific Multicast in IEEE 802.16 Network . . . . . . . . . 5
4.1. Multicast on IPv6 CS . . . . . . . . . . . . . . . . . . . 5
4.2. Multicast on Ethernet CS and IEEE 802.1Q VLAN CS . . . . . 6
5. Security Considerations . . . . . . . . . . . . . . . . . . . 7
6. IANA Considerations . . . . . . . . . . . . . . . . . . . . . 7
7. References . . . . . . . . . . . . . . . . . . . . . . . . . . 7
7.1. Normative References . . . . . . . . . . . . . . . . . . . 7
7.2. Informative References . . . . . . . . . . . . . . . . . . 8
Authors' Addresses . . . . . . . . . . . . . . . . . . . . . . . . 9
Intellectual Property and Copyright Statements . . . . . . . . . . 11
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1. Introduction
The IEEE 802.16 based network supports both fixed, nomadic
[IEEE802.16] and mobile [IEEE802.16e]network environments. The
[IEEE802.16] standards specify wireless media to share multiple
mobile nodes: point-to-multipoint and mesh. The PMP modes, point-to-
multipoint, operate that uplink supports only unicast and downlink
can support multicast. Therefore [IEEE802.16] can not generally
support multicast compared to [IEEE802.3] that supports broadcast
[RFC2464].
[I-D.ietf-16ng-ipv6-over-ipv6cs] describes IPv6 related convergence
sublayer for unicast. The multicast transport capabilities are
important to both control and bearer aspects in Internet Protocol.
The [RFC0826] for IPv4 and [RFC2461] for IPv6 require multicast
capabilities for control aspects.
The [IEEE802.16] standards specify service specific convergence
sublayer to process higher-layer protocol data unit based on
classification. The types of service specific convergence sublayer
are asynchronous transfer mode and packets such as IPv6, IPv4, IEEE
802.3/Ethernet, IEEE 802.1Q VLAN, IPv6 over IEEE 802.3/Ethernet, IPv6
over IEEE 802.1Q VLAN, IPv4 over IEEE 802.3/Ethernet, IPv4 over IEEE
802.1Q VLAN and so on. A multicast capability depends on the
convergence sublayer parameters of REGISTRATION message at IEEE
802.16 MAC messages. This document describes IPv6 multicast
[RFC4291] transport over IEEE 802.16 networks in accordance with
convergence sublayer.
The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT",
"SHOULD", "SHOULD NOT", 'RECOMMENDED", "MAY", and "OPTIONAL" in this
document are to be interpreted as described in [RFC2119].
2. Terminology
o IEEE802.16 : IEEE802.16 standards including IEEE802.16e standards
o Base Station (BS):A generalized equipment sets providing
connectivity, management, and control between the subscriber
station and the 802.16 networks.
o Connection Identifier(CID): A 16 bit value that identifies a
connection to equivalent peers in the MAC of the base station and
subscriber station.
o Convergence Sublayer (CS): Sublayer in the IEEE 802.16 MAC layer
that classifies higher layer data and associates them to the
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proper MAC service flow identifier and connection identifier.
o IPv6 CS: This CS SHOULD set bit #2 for type 7 in REG-REQ and REG-
RSP message as specified by [IEEE802.16]. And this CS uses the
value 2 for type 28 in DSx-REQ message.
o IPv6 over Ethernet CS: This CS SHOULD set bit #6 for type 7 in
REG-REQ and REG-RSP message as specified by [IEEE802.16]. And
this CS uses the value 6 for type 28 in DSx-REQ message.
o IPv6 over IEEE 802.1Q VLAN CS: This CS SHOULD set bit #8 for type
7 in REG-REQ and REG-RSP message as specified by [IEEE802.16].
And this CS uses the value 8 for type 28 in DSx-REQ message.
o Mobile Node (MN): An user equipment that supports IP over IEEE
802.16e standard. It SHOULD support mobility capability.
3. Link layer format for IEEE 802.16 Network
An 802.16 PDU consists of a MAC header, a data payload and CRC as
shown in Figure 1. The CRC field is an optional.
| 48 bits | variable | 32 bits|
+-------------------+--------------------+--------+
| 802.16 MAC Header | Payload | CRC |
+-------------------+--------------------+--------+
Figure 1: IEEE 802.16 PDU format
Figure 2 shows an IEEE802.16 MAC header.
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|H|E| TYPE |E|C|EKS|R| LENGTH |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| CID | HCS |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
Figure 2: IEEE 802.16 MAC Header
o H: Header Type (1 bit).
o E: Encryption Control (1 bit). 0 = Payload is not encrypted; 1 =
Payload is encrypted.
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o TYPE (6 bits)
o E: Extended Subheader Field (1 bit)
o C: CRC Indicator. 1 = CRC is included, 0 = 1 No CRC is included
o EKS: Encryption Key Sequence (2 bits)
o R: Reserved (1 bit). Shall be set to zero.
o LENGTH: The Length in bytes of the MAC PDU including the MAC
header and the CRC if present (11 bits)
o CID: Connection Identifier (16 bits)
o HCS: Header Check Sequence (8 bits)
+----------------------------+-------------+
| CID | hexadecimal |
+----------------------------+-------------+
| Multicast CID | FEA0 ~ FEFE |
| Multicast polling CID | FF00~FFF9 |
| Normal mode multicast CID | FFFA |
| Sleep mode multicast CID | FFFB |
| Idle mode multicast CID | FFFC |
| Fragmentable Broadcast CID | FFFD |
| Broadcast CID | FFFF |
+----------------------------+-------------+
Table 1: Multicast CID for IEEE 802.16
4. CS Specific Multicast in IEEE 802.16 Network
4.1. Multicast on IPv6 CS
The MAC signaling type 1 and signaling type 2 do not deliver a
payload. The 802.16 frame with generic MAC header can deliver IPv6
packet. The generic MAC header uses for IEEE 802.16 frame for native
IPv6 convergence sublayer.
The 48 bits address values in IEEE 802.3 header are used to identify
at the link layer. However, the IEEE802.16 MAC header does not have
a link layer address. Instead, the CID fields in the MAC header
perform link layer identification between MN and BS.
IPv6 multicast address may use with CID fields at the 802.16 link
layer as shown in Figure 3.
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| 8 | 4 | 4 | 108 bits | 4 |
+----+----+----+----------------+-+-+-+-+ IPv6 Multicast Address
| FF |flgs|scop| multicast group ID | [RFC4291]
+----+----+----+----------------+-+-+-+-+
|
+----------------------+
|
|
| 8 | 4 | 4 |
+----+----+----+
| FE |scop| ID | Multicast CID for IPv6 CS
+----+----+----+
Figure 3: Direct mapping for IPv6 CS
The multicast CID, 0XFFA0-0xFEFE, SHOULD use to multicast in IEEE
802.16 specification. The other CIDs are multicast polling CID,
normal mode multicast CID, sleep mode multicast CID, idle mode
multicast CID, fragmentable broadcast CID and broadcast CID. It is
for specific usage and difficult to identify layer 3 multicast
addresses.
The information for 802.16 multicast in CID may use scope field and
multicast group identifier that specified by [RFC4291]. The scope
and multicast group identifier are important to identify multicast
address [IPv6MA]. IPv6 multicast address prefix (0xFF) translate to
802.16 CID multicast group (0xFE).
The flag information on IPv6 multicast address normally use zero.
So, 802.16 CID may not use flag in [RFC4291] for multicast mapping.
The scope information on IPv6 multicast address in important.
Rherefore, 802.16 CID SHOULD use scope information for multicasting.
The last 4 bits in group identifier are important to IPv6 multicast
address [RFC4291]. The multicast group identifier uses last 4 bits
to 12 bits based on the purpose. So, last 4 bits of the IPv6
multicast group identifier shall use because only 4 bits are
available at CID. The duplication of the last 4 bits for multicast
can resolve by use of scope information. The unique identification
to the whole IPv6 multicast address requires modification of such
specification as [IEEE802.16], [RFC2460], [RFC4291]. Therefore,
Figure 3 RECOMMENDED IPv6 multicast address mapping to 802.16 CID.
4.2. Multicast on Ethernet CS and IEEE 802.1Q VLAN CS
IPv6 multicast require at IPv6 over IEEE802.3 or [IEEE802.1Q] VLAN
CS. In this case, IPv6 multicast mapping to 802.16 CID may use
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either direct mapping or indirect mapping. The direct mapping scheme
is described in section 4.1.
IPv6 multicast mapping to CID may use indirect mapping as following.
Firstly, [RFC2464] use for IPv6 multicast address mapping to
destination address at 802.3 link layer. After that, multicast
address at 802.3 frame may translate to 602.16 CID as shown in Figure
3. A BS transmit IPv6 multicast packet that destination address
start with 0X3333 at 802.3 frame for IPv6 over IEEE802.3 or VLAN
encapsulation
| 16 | 24 bits | 8 |
+------+-----------------+-+-+-+-+-+-+-+-+ Ethernet Multicast Address
| 3333 | 802.3 multicast address | [RFC2464]
+------+-----------------+-+-+-+-+-+-+-+-+
|
+-------------------+
|
|
| 8 | 8 |
+----+--------------+
| FE | multicast ID | Multicast CID for IPv6 over Ethernet CS
+----+--------------+ Multicast CID for IPv6 over IEEE 802.1Q VLAN CS
Figure 4: Indirect mapping for Ethernet CS and VLAN CS
5. Security Considerations
This document does not introduce any new vulnerabilities to IPv6
specifications or operation. The security of the 802.16 air
interface is the subject to [IEEE802.16].
6. IANA Considerations
This document requests no action by IANA.
7. References
7.1. Normative References
[IEEE802.16]
"IEEE Standard for Local and metropolitan area networks -
Specific requirements - Part 16: Air Interface for Fixed
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Broadband Wireless Access Systems"", IEEE Standard 802.16,
June 2004.
[IEEE802.16e]
"IEEE Standard for Local and metropolitan area networks -
Specific requirements - Part 16: Air Interface for Fixed
Broadband Wireless Access Systems, Amendment 2: Physical
and Medium Access Control layers for Combined Fixed and
Mobile Operation in Licensed bands and Corrigendum 1"",
IEEE Standard 802.16e, December 2005.
[RFC2119] Bradner, S., "Key words for use in RFCs to Indicate
Requirement Levels", BCP 14, RFC 2119, March 1997.
[RFC2464] Crawford, M., "Transmission of IPv6 Packets over Ethernet
Networks", RFC 2464, December 1998.
[RFC4291] Hinden, R. and S. Deering, "IP Version 6 Addressing
Architecture", RFC 4291, February 2006.
7.2. Informative References
[I-D.ietf-16ng-ipv6-over-ipv6cs]
Patil, B., "IPv6 Over the IP Specific part of the Packet
Convergence sublayer in 802.16 Networks",
draft-ietf-16ng-ipv6-over-ipv6cs-09 (work in progress),
April 2007.
[IEEE802.1Q]
Institute of Electrical and Electronics Engineers, "IEEE
Standard for Local and Metropolitan Area Networks: Virtual
Bridged Local Area Networks", IEEE Standard 802.1Q,
May 2006.
[IEEE802.3]
"IEEE Standard for Information technology -
Telecommunications and information exchange between
systems - Local and metropolitan area networks - Specific
requirements - Part 3: Carrier sense multiple access with
collision detection (CSMA/CD) access method and physical
layer specifications"", IEEE Standard 802.3, March 2002.
[RFC0826] Plummer, D., "Ethernet Address Resolution Protocol: Or
converting network protocol addresses to 48.bit Ethernet
address for transmission on Ethernet hardware", STD 37,
RFC 826, November 1982.
[RFC2461] Narten, T., Nordmark, E., and W. Simpson, "Neighbor
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Discovery for IP Version 6 (IPv6)", RFC 2461,
December 1998.
Authors' Addresses
Sang-Eon Kim
Infra Lab., KT
17 Woomyeon-dong, Seocho-gu
Seoul, 137-792
Korea
Phone: +82 2 526 6117
Fax: +82 2 526 5200
Email: sekim@kt.co.kr
Jong Sam Jin
Infra Lab., KT
17 Woomyeon-dong, Seocho-gu
Seoul, 137-792
Korea
Phone: +82 2 526 6113
Fax: +82 2 526 5200
Email: jongsam@kt.co.kr
Seong-Choon Lee
Infra Lab., KT
17 Woomyeon-dong, Seocho-gu
Seoul, 137-792
Korea
Phone: +82 2 526 6153
Fax: +82 2 526 5200
Email: lsc@kt.co.kr
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Sang-Hong Lee
Infra Lab., KT
17 Woomyeon-dong, Seocho-gu
Seoul, 137-792
Korea
Phone: +82 2 526 6500
Fax: +82 2 526 6502
Email: shleee@kt.co.kr
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