AIR INTERFACE FOR FIXED BROADBAND WIRELESS ACCESS SYSTEMS |
IEEE Std 802.16-2001 |
Begin
DSD-REQ / DSD Succeeded, DSD-RSP
Holding |
DSD-REQ / DSD-RSP |
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Down |
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( Timeout T10 / DSD Ended )
( SF Deleted / DSD Ended )
End
Figure 74—DSD—Remotely initiated transaction state transition diagram
6.2.13.8.3 Dynamic Service Addition (DSA)
6.2.13.8.3.1 SS-initiated DSA
An SS wishing to create an uplink and/or downlink Service flow sends a request to the BS using a dynamic service addition request message (DSA-REQ). The BS checks the integrity of the message and, if the message is intact, sends a message received (DSX-RVD) response to the SS. The BS checks the SS’s authorization for the requested service(s) and whether the QoS requirements can be supported, generating an appropriate response using a dynamic service addition response Message (DSA-RSP). The SS concludes the transaction with an acknowledgment Message (DSA-ACK). This process is illustrated in Table 66.
In order to facilitate a common admission response, an uplink and a downlink Service flow can be included in a single DSA-REQ. Both service flows are either accepted or rejected together.
Copyright © 2002 IEEE. All rights reserved. |
143 |
IEEE Std 802.16-2001 |
LOCAL AND METROPOLITAN AREA NETWORKS—PART 16: |
Table 66—DSA initiated from SS
SS |
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BS |
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New service flow(s) needed |
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Check if resources are available |
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Send DSA-REQ |
---DSA-REQ--> |
Receive DSA-REQ |
Set Timers T7 and T14 |
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Timer T14 Stops |
<-- DSX-RVD-- |
DSA-REQ integrity valid |
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Check whether SS is authorized for |
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Service(s)a |
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Check whether service flow(s) QoS can be |
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supported |
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Create SFID(s) |
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If uplink AdmittedQoSParamSet is |
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non-null, map service flow to CID |
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If uplink ActiveQoSParamSet is non-null, |
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Enable reception of data on new uplink |
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service flow |
Receive DSA-RSP |
<--DSA-RSP--- |
Send DSA-RSP |
Timer T7 Stops |
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If ActiveQoSParamSet is non-null, Enable |
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transmission and/or reception of data on |
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new service flow(s) |
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Send DSA-ACK |
---DSA-ACK--> |
Receive DSA-ACK |
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If downlink ActiveQoSParamSet is |
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non-null, Enable transmission of data on |
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new downlink service flow |
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aAuthorization happens prior to the DSA-REQ being received by the BS. The details of BS signalling to anticipate a DSA-REQ are beyond the scope of this specification.
A BS wishing to establish an uplink and/or a downlink dynamic service flow(s) with an SS performs the following operations. The BS checks the authorization of the destination SS for the requested class of service and to determine whether the QoS requirements can be supported. If the service can be supported, the BS generates new SFID(s) with the required class of service and informs the SS using a DSA-REQ Message. If the SS checks that it can support the service, it responds using a DSA Message. The transaction completes with the BS sending the acknowledge Message (DSA-ACK). This process is illustrated in Table 67.
144 |
Copyright © 2002 IEEE. All rights reserved. |
AIR INTERFACE FOR FIXED BROADBAND WIRELESS ACCESS SYSTEMS IEEE Std 802.16-2001
Table 67—DSA initiated from BS |
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SS |
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BS |
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New service flow(s) required for SS |
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Check whether SS is authorized for Service(s) |
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Check whether service flow(s) QoS can be |
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supported |
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Create SFID(s) |
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If AdmittedQoSParamSet is non-null, map |
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service flow to CID |
Receive DSA-REQ |
<--DSA-REQ--- |
Send DSA-REQ |
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Set Timer T7 |
Confirm that SS can support service |
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flow(s) |
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Add Downlink SFID (if present) |
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Enable reception on any new downlink |
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service flow |
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Send DSA-RSP |
---DSA-RSP--> |
Receive DSA-RSP |
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Timer T7 Stops |
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Enable transmission (downlink) or reception |
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(uplink) of data on new service flow |
Receive DSA-ACK |
<--DSA-ACK--- |
Send DSA-ACK |
Enable transmission on new uplink ser- |
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vice flow |
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Copyright © 2002 IEEE. All rights reserved. |
145 |
IEEE Std 802.16-2001 |
LOCAL AND METROPOLITAN AREA NETWORKS—PART 16: |
6.2.13.8.3.2 DSA state transition diagrams
DSA state transition diagrams are shown in Figure 75—Figure 83.
DSA-Local
Begin
SF Add
DSA-REQ
Start timer
T7
[SS Only] Start timer T14
Save transmitted
DSA-REQ
Set DSA-REQ Retries available to ‘DSx Request Retries’
DSA-Local
DSA-RSP
Pending
Figure 75—DSA—Locally initiated transaction begin state flow diagram
146 |
Copyright © 2002 IEEE. All rights reserved. |
AIR INTERFACE FOR FIXED BROADBAND WIRELESS ACCESS SYSTEMS |
IEEE Std 802.16-2001 |
DSC-Remote
Begin
Timeout |
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SF |
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SF |
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DSA-RSP |
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T7 |
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Timeout |
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Delete-Remote |
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Abort Add |
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DSX-RVD |
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T14 |
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Retries |
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No |
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Stop timer |
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Stop timer |
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T7 |
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T7 |
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Available? |
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Yes |
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DSA-Local |
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DSA |
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DSA-RSP |
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Saved |
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Start timer |
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with |
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Ended |
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Pending |
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CC=12 |
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DSA-REQ |
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T10 |
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(‘reject-add-aborted) |
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DSA-Local |
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DSA-Local |
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Start timer |
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Retries |
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End |
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T7 |
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Exhausted |
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No |
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OK? |
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Decrement |
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Yes |
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DSA-REQ |
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Retries Available |
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Enable SF |
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DSA Failed |
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DSA-Local |
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DSA-RSP |
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Pending |
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DSA |
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Succeeded |
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Set |
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CC to >0 |
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(reject-...) |
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CC to ) |
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(OK/success)’ |
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DSA-ACK |
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Save transmitted |
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Start timer |
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T10 |
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DSC-Local |
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Holding Down |
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Figure 76—DSA—Locally initiated transaction DSA-RSP pending state flow diagram
Copyright © 2002 IEEE. All rights reserved. |
147 |
IEEE Std 802.16-2001 |
LOCAL AND METROPOLITAN AREA NETWORKS—PART 16: |
DSA-Local
Holding Down
SF Changed, |
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SF Change-Remote, |
Timeout T10 |
SF Delete-Local |
DSA-RSP |
SF Delete-Remote |
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DSA-Local
Stop T10 Timer Deleting
Saved
Service Flow
DSA-ACK
DSA ACK
Lost
DSA Ended
DSA-Local
Holding Down
DSA-Local
End
Figure 77—DSA—Locally initiated transaction holding state flow diagram
148 |
Copyright © 2002 IEEE. All rights reserved. |
AIR INTERFACE FOR FIXED BROADBAND WIRELESS ACCESS SYSTEMS |
IEEE Std 802.16-2001 |
DSA-Local
Retries Exhausted
Timeout T10 |
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SF Delete-Remote |
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SF Abort Add |
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DSA-RSP |
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Save DSA-ACK |
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DSA Erred |
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Stop T10 Timer |
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with |
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Stop T10 Timer |
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CC=12 |
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OK ? |
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DSA Ended |
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No |
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Yes |
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DSA-Local
End Enable
service flow
DSA Failed
DSA
Succeeded
Set CC to >0 (reject-...)
Set CC to 0 (OK/success)
DSA-ACK
Save transmitted
DSA-ACK
Start T10 Timer
DSA-Local
Holding Down
Figure 78—DSA—Locally initiated transaction retries exhausted state flow diagram
Copyright © 2002 IEEE. All rights reserved. |
149 |
IEEE Std 802.16-2001 |
LOCAL AND METROPOLITAN AREA NETWORKS—PART 16: |
DSA-Local
Deleting
Service Flow
SF Deleted, |
Timeout T10 |
DSA-RSP |
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SF Delete-Remote |
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Stop T10 Timer
DSA ACK
Lost
DSA-Local
Deleting
Service Flow
DSA Ended
DSA-Local
End
Figure 79—DSA—Locally initiated transaction deleting service flow state flow diagram
150 |
Copyright © 2002 IEEE. All rights reserved. |
AIR INTERFACE FOR FIXED BROADBAND WIRELESS ACCESS SYSTEMS |
IEEE Std 802.16-2001 |
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DSA-Remote |
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Begin |
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DSA-REQ |
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[BS Only] |
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DSX-RVD |
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No |
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OK? |
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Yes |
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DSA Failed |
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[SS only] |
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[BS only] |
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Enable down- |
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Enable uplink |
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link SF |
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SF |
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Set CC to >0 |
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(reject-...) |
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Set CC to 0
(OK/success)
DSA-RSP
Start timer
T8
Save transmitted
DSA-RSP
Set DSA-Retries
available to
‘DSx Response
Retries’
DSA-Remote
DSA-ACK
Pending
Figure 80—DSA—Remotely initiated transaction begin state flow diagram
Copyright © 2002 IEEE. All rights reserved. |
151 |
IEEE Std 802.16-2001 |
LOCAL AND METROPOLITAN AREA NETWORKS—PART 16: |
DSA-Remote
DSA-ACK
Pending
DSA-REQ |
SF DSA-ACK |
Timeout T8 |
SF Delete- |
SF Delete- |
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DSA-ACK |
Lost |
Remote |
Local |
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Retries |
Stop T8 Timer |
Stop T8 Timer |
Stop T8 Timer |
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Available |
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? |
No |
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Yes |
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Start T10 Timer |
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Saved |
DSA Erred |
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DSA-RSP |
DSA-Remote |
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Retries |
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Deleting |
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Available |
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Service Flow |
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? |
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No |
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Start T8 Timer |
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Yes |
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DSA Ended |
No |
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OK ? |
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Saved |
Decrement |
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DSA-RSP |
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DSA-RSP |
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Retries Available |
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Yes |
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DSA-Remote |
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End |
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DSA-Remote |
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[ SS Only ] |
[ BS Only ] |
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Disable |
Enable |
Enable |
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DSA-ACK |
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service flow |
uplink |
downlink |
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Pending |
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service flow |
service flow |
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DSA Failed
DSA
Succeeded
Start T8 Timer
DSA-Remote
Holding Down
Figure 81—DSA—Remotely initiated transaction DSA-ACK pending state flow diagram
152 |
Copyright © 2002 IEEE. All rights reserved. |
AIR INTERFACE FOR FIXED BROADBAND WIRELESS ACCESS SYSTEMS |
IEEE Std 802.16-2001 |
DSA-Remote
Holding Down
SF Changed, |
|
SF Delete-Local, |
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|
|||
SF Deleted, |
Timeout T8 |
DSA-ACK |
||||||
SF Change-Remote |
||||||||
SF Delete-Remote |
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Stop T8 Timer
DSA-Remote
Holding Down
DSA Ended
DSA-Remote
End
Figure 82—DSA—Remotely initiated transaction holding down state flow diagram
DSA-Remote
Deleting
Service Flow
SF Deleted, |
Timeout T10 |
DSA-REQ, |
|
SF Delete-Remote |
DSA-ACK |
||
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|||
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DSA-Remote
Stop T10 Timer Deleting
Service Flow
DSA Ended
DSA-Remote
End
Figure 83—DSA—Remotely initiated transaction deleting service state flow diagram
Copyright © 2002 IEEE. All rights reserved. |
153 |