January, 2005

Rene Struik, Certicom Corp.Slide 1

15-05-0083-02-0400

Submission

Project: IEEE P802.15 Working Group for Wireless Personal Area Networks (WPANs)Project: IEEE P802.15 Working Group for Wireless Personal Area Networks (WPANs)

Submission Title: [Group Address Support]Date Submitted: [January 20, 2005]Source: [René Struik] Company [Certicom Corp.]Address [5520 Explorer Drive, 4th Floor, Mississauga, ON Canada L4W 5L1]Voice:[+1 (905) 501-6083], FAX: [+1 (905) 507-4230], E-Mail:[rstruik@certicom.com]

Re: [IEEE documents: 02/474r2 (January 16, 2003, Slides 5-6), 15-03-320-00-0040 (July 23, 2003, Slides 4-6), 15-03-320-02-0040 (November 11, 2003, Slides 6-9)]

Abstract: [Suggestion for Group Addressing Support in IEEE 802.15.4b Low-Rate WPAN standard.]

Purpose: [Assist in improving the IEEE 802.15.4 WPAN standard (Draft D18).]Notice: This document has been prepared to assist the IEEE P802.15. It is offered as a basis for discussion and is not binding on the contributing individual(s) or organization(s). The material in this document is subject to change in form and content after further study. The contributor(s) reserve(s) the right to add, amend or withdraw material contained herein.Release: The contributor acknowledges and accepts that this contribution becomes the property of IEEE and may be made publicly available by P802.15.

January, 2005

Rene Struik, Certicom Corp.Slide 2

15-05-0083-02-0400

Submission

Group Addressing Proposal for Draft IEEE 802.15.4bWPAN Standard

René Struik, Certicom Research

January, 2005

Rene Struik, Certicom Corp.Slide 3

15-05-0083-02-0400

Submission

Group Addressing Support (Approach 1)

Destination Addressing fields:<destination address> ::= <physical address> | <logical address>

Short destination addresses:• Ordinary destination addresses: 0x0000 – 0xFFEF (65,520=65,536-16 addresses)• Logical destination addresses: 0xFFF0 – 0xFFFF (16 group addresses)

Filtering incoming frames by device B:• Check on B’s long address;• Check on B’s (short address, PANId) combination• Check membership group:

(1) Group addressing enabled iff DestAddr=0xFFFX;(2) Membership test succeeds iff B is member of ‘X’ group

Notes:• Group addressing ON/OFF decision does not require introduction of separate

group addressing bit• Membership test: matching ‘X’ G (set of groups B is member of)• Set of logical destination addresses fixed (i.e., meaning centrally determined)

January, 2005

Rene Struik, Certicom Corp.Slide 4

15-05-0083-02-0400

Submission

Group Addressing Support (Approach 2a)

Destination Addressing fields:<destination address> ::= <physical address> | <logical address>

{option indicated by 1-bit group addressing indicator}

Short destination addresses:• Ordinary destination addresses: 0x0000 – 0xFFFF (65,536 addresses)• Logical destination addresses: 0x0000 – 0xFFFF (65,536 group addresses)

Filtering incoming frames by device B:• Check on B’s long address;• Check on B’s (short address, PANId) combination• Check membership group:

(1) Group addressing enabled if group addressing bit set;(2) Membership test succeeds iff B is member of DestAddr group

Notes:• Group addressing ON/OFF decision does require introduction of separate group

addressing bit• Membership test: matching DestAddr G (set of groups B is member of)• Set of logical destination addresses not fixed (i.e., meaning decentralized)

January, 2005

Rene Struik, Certicom Corp.Slide 5

15-05-0083-02-0400

Submission

Group Addressing Support (Approach 2b)

Destination Addressing fields:<destination address> ::= <physical address> | <logical address>

{option indicated by DestAddrMode ‘01’ (currently reserved)}

Short destination addresses:• Ordinary destination addresses: 0x0000 – 0xFFFF (65,536 addresses)• Logical destination addresses: 0x0000 – 0xFFFF (65,536 group addresses)

Filtering incoming frames by device B:• Check on B’s long address;• Check on B’s (short address, PANId) combination• Check membership group:

(1) Group addressing enabled if group addressing bit set;(2) Membership test succeeds iff B is member of DestAddr group

Notes:• Group addressing ON/OFF decision does require introduction of separate group

addressing indicator• Membership test: matching DestAddr G (set of groups B is member of)• Set of logical destination addresses not fixed (i.e., meaning decentralized)

January, 2005

Rene Struik, Certicom Corp.Slide 6

15-05-0083-02-0400

Submission

Group Addressing Support (Approach 2b vs. Approach 1)

(General)

• Decentralized assignment of meaning to multicast addresses

• No changes to parameters primitives (Option 2b & Option 1 (not for Option 2a))

• Hard upper limit of #group addresses allows destination address filtering in

hardware (e.g., with upper limit n, #lookup table entries 3+n [n=2 5 entries])

(With Security Enabled)

• Allows ‘clean’ crypto processing of secured broadcast frames (avoids guaranteed

crypto processing failures at recipient’s side if recipient has wrong key)

• Allows savings of 4 octets (sic!) per secured broadcast frame

• Allows secured group communications in all settings

• Securing group communications allows complete reuse of security provisions

already in place for securing broadcast frames

January, 2005

Rene Struik, Certicom Corp.Slide 7

15-05-0083-02-0400

Submission

Motion 1

Use the currently (802.15.4-2003) reserved value ‘01’ in the destination addressingMode subfield in the Frame Control Field in the MAC Header as group addressingindicator (‘01’: group addressing ON; otherwise: OFF).

January, 2005

Rene Struik, Certicom Corp.Slide 8

15-05-0083-02-0400

Submission

Motion 2

Structure logical destination address as follows:

Addressing fields:<source address> ::= <physical address><destination address> ::= <physical address> | <logical address>

{option indicated by 1-bit group address indicator}<physical address> ::= implicit: coordinator | <short address> |

<short Address><PAN Id> | <long address>{option indicated by 2-bit addressing mode}

<logical address> ::= <group source> <group Id><group source> ::= <physical address><group Id> ::= <group counter>

“Atoms” (end symbols in grammar):<short address> ::= 16-bit address<long address> ::= 64-bit address<PAN Id> ::= 16-bit PAN address<group counter> ::= 1-octet field {this allows 256 groups with same group source}

January, 2005

Rene Struik, Certicom Corp.Slide 9

15-05-0083-02-0400

Submission

Motion 3

Instruct editors to change security draft, such as to incorporate secured groupcommunications.