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IEEE Std 802.16-2001

LOCAL AND METROPOLITAN AREA NETWORKS—PART 16:

7-D Operational (TEK Refresh Timeout) Rekey Wait

a)send Key Request message to BS

b)set Key Request retry timer to Rekey Wait Timeout

8-B Op Wait (Key Reply) Operational

a)clear Key Request retry timer

b)process contents of Key Reply message and incorporate new keying material into key database

c)set the TEK refresh timer to go off “TEK Grace Time” seconds prior to the key’s scheduled expiration

8-E Rekey Wait (Key Reply) Operational

a)clear Key Request retry timer

b)process contents of Key Reply message and incorporate new keying material into key database

c)set the TEK refresh timer to go off “TEK Grace Time” seconds prior to the key’s scheduled expiration

9-B Op Wait (Key Reject) Start

a)clear Key Request retry timer

b)terminate TEK FSM

9-E Rekey Wait (Key Reject) Start

a)clear Key Request retry timer

b)terminate TEK FSM

c)remove SAID keying material from key table

7.3 Dynamic SA creation and mapping

Dynamic Security Associations are SAs that a BS establishes and eliminates dynamically in response to the enabling or disabling of specific downlink service flows. SSs learn the mapping of a particular privacy-enabled service flow to that flow’s dynamically assigned SA through the exchange of DSx messages.

7.3.1 Dynamic SA creation

The BS may dynamically establish SAs by issuing an SA Add message. Upon receiving an SA Add message, the SS shall start a TEK state machine for each SA listed in the message.

7.3.2 Dynamic mapping of SA

When creating a new service flow, an SS may request an existing SA be used by passing the SAID of the SA in a DSA-REQ or DSC-REQ message. The BS checks the SS’s authorization for the requested SA and generates appropriate response using a DSA-RSP or DSC-RSP message correspondingly.

186

Copyright © 2002 IEEE. All rights reserved.

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