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AIR INTERFACE FOR FIXED BROADBAND WIRELESS ACCESS SYSTEMS

IEEE Std 802.16-2001

6.2.13.8.5 Connection release

Any service flow can be deleted with the Dynamic Service Deletion (DSD) Messages. When a service flow is deleted, all resources associated with it are released. However, if a basic, primary management, or secondary management service flow of an SS is deleted, that SS is deregistered and shall reregister. Also, if a service flow that was provisioned during registration is deleted, the provisioning information for that service flow is lost until the SS reregisters. However, the deletion of a provisioned service flow shall not cause an SS to re-register. Therefore, care should be taken before deleting such service flows.

NOTE—Unlike DSA and DSC Messages, DSD Messages are limited to only a single service flow.

6.2.13.8.5.1 SS-initiated DSD

An SS wishing to delete a service flow generates a delete request to the BS using a Dynamic Service Deletion-Request Message (DSD-REQ). The BS removes the service flow and generates a response using a Dynamic Service Deletion-Response Message (DSD-RSP). This process is illustrated in Table 70. Only one service flow can be deleted per DSD-REQ.

Table 70—DSD-initiated from SS

SS

 

BS

 

 

 

Service flow no longer needed

 

 

Delete service flow

 

 

Send DSD-REQ

---DSD-REQ-->

Receive DSD-REQ

 

 

Verify SS is service flow ‘owner’

 

 

Delete fervice flow

Receive DSD-RSP

<--DSD-RSP---

Send DSD-RSP

 

 

 

6.2.13.8.5.2 BS-initiated DSD

A BS wishing to delete a dynamic service flow generates a delete request to the associated SS using a DSD-REQ. The SS removes the service flow and generates a response using a DSD-RSP. This process is illustrated in Table 71. Only one service flow can be deleted per DSD-REQ.

 

Table 71—DSD initiated from BS

 

 

 

SS

 

BS

 

 

 

 

 

Service flow no longer needed

 

 

Delete service flow

 

 

Determine associated SS for this

 

 

service flow

Receive DSD-REQ

<---DSD-REQ--

Send DSD-REQ

Delete service flow

 

 

Send DSD-RSP

---DSD-RSP-->

Receive DSD-RSP

 

 

 

Copyright © 2002 IEEE. All rights reserved.

165

IEEE Std 802.16-2001

LOCAL AND METROPOLITAN AREA NETWORKS—PART 16:

6.2.13.8.5.3 DSD state transition diagrams

DSD state transition diagrams are shown in Figure 93—Figure 96.

DSD-Local

Begin

SF Delete

Disable service flow

DSD-REQ

Start T7 Timer

Save transmitted

DSD-REQ

Set DSD-REQ Retries available to ’DSx Request Retries’

DSD-Local

DSD-RSP

Pending

Figure 93—DSD—Locally initiated transaction begin state flow diagram

166

Copyright © 2002 IEEE. All rights reserved.

AIR INTERFACE FOR FIXED BROADBAND WIRELESS ACCESS SYSTEMS

IEEE Std 802.16-2001

DSD-Local

DSD-RSP

Pending

SF DSD-REQ

 

 

Timeout T7

 

 

 

 

 

SF Delete-Remote

 

 

DSD-RSP

 

Lost

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Retries

 

 

Retries

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Stop T7 Timer

 

 

Stop T7 Timer

available

 

 

available

 

 

 

 

 

 

 

?

 

 

 

?

 

 

 

 

No

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Yes

 

 

 

 

Yes

 

 

 

 

 

 

 

 

 

 

DSD

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Saved

 

 

Saved

 

DSD Erred

 

 

 

Succeeded

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

DSD-REQ

No

DSD-REQ

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Start T10 Timer

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Start T7 Timer

 

 

DSD Ended

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

DSD-Local

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Decrement

 

 

DSD-Local

 

 

 

 

 

 

 

 

 

 

 

 

Holding Down

 

 

 

 

 

 

DSD-REQ

 

 

 

 

 

 

 

 

 

 

 

 

End

 

 

 

 

 

 

 

 

 

 

 

Retries Available

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

DSD-Local

DSD-RSP

Pending

Figure 94—DSD—Locally Initiated transaction DSD-RSP pending state flow diagram

Copyright © 2002 IEEE. All rights reserved.

167

IEEE Std 802.16-2001

LOCAL AND METROPOLITAN AREA NETWORKS—PART 16:

DSD-Local

Holding Down

Timeout T10

SF Deleted

DSD-RSP

 

 

 

DSD Ended

DSD

Succeeded

DSD-Local

End

DSD-Local

Holding Down

Figure 95—DSD—Locally initiated transaction holding down state flow diagram

168

Copyright © 2002 IEEE. All rights reserved.

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