IEEE Std 802.16-2001 |
LOCAL AND METROPOLITAN AREA NETWORKS—PART 16: |
C/(N+I) (dB)
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Burst Profile Z |
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Burst Profile #Z Minimum Entry Threshold |
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Overlap |
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Burst Profile #Z Mandatory Exit Threshold |
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Burst |
Profile |
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Burst Profile #Y Minimum Entry Threshold |
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Overlap |
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Burst Profile #Y Mandatory Exit Threshold |
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Burst Profile X |
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0 |
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Burst Profile #X Minimum Entry Threshold |
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Burst Profile #X Mandatory Exit Threshold |
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Figure 59—Burst profile threshold usage
6.2.11 Update of channel descriptors
The channel descriptors (i.e., the UCD and DCD messages) are transmitted at regular intervals by the BS. Each descriptor contains the Configuration Change Count, which shall remain unchanged as long as the channel descriptor remains unchanged. All UL-MAP and DL-MAP messages allocating transmissions and receptions using burst profiles defined in a channel descriptor with a given Configuration Change Count value shall have a UCD/DCD Count value equal to the Configuration Change Count of the corresponding channel descriptor.
The procedure to transition from one generation of the channel descriptors (and, as a consequence, the set of burst profiles) to the next is shown in Table 64 and Table 66, for the uplink and downlink respectively. The Configuration Change Count shall be incremented by 1 modulo 256 for every new generation of channel descriptor. After issuing a DL-MAP or UL-MAP message with the Configuration Change Count equal to that of the new generation, the old channel descriptor ceases to exist and the BS shall not issue UL-MAP and DL-MAP messages referring to it. When transitioning from one generation to the next, the BS shall schedule the transmissions of the UCD and DCD messages in such a way that each terminal has the possibility to hear it at least once.
120 |
Copyright © 2002 IEEE. All rights reserved. |
AIR INTERFACE FOR FIXED BROADBAND WIRELESS ACCESS SYSTEMS |
IEEE Std 802.16-2001 |
Table 64—UCD update
BS |
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SS |
send UL-MAP with UCD Count ----------- |
UL-MAP------------ |
> |
descriptor with UCD Count = i |
= i |
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previously stored in SS |
<------------- |
data----------------- |
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Transmit using burst profiles |
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defined in UCD with |
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Configuration Change Count = i |
[change of channel descriptor |
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commanded| |
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send UL-MAP with UCD Count ----------- |
UL-MAP------------ |
> |
descriptor with Configuration |
= i |
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Change Count = i still stored in |
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SS |
send UCD message with Configu- |
-----------UCD------------ |
> |
store new descriptor with |
ration Change Count = (i+1 MOD |
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Configuration Change Count = |
256) |
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(i+1 MOD 256) |
<-------------- |
data------------------- |
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Transmit using burst profiles |
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defined in UCD with |
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Configuration Change Count = i |
send UL-MAP with UCD Count ----------- |
UL-MAP------------ |
> |
descriptor with Configuration |
= i |
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Change Count = i still stored in |
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SS |
Retransmit UCD message with |
-----------UCD------------ |
> |
store new descriptor with |
Configuration Change Count = |
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Configuration Change Count = |
(i+1 MOD 256) |
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(i+1 MOD 256) |
[UCD transition interval start] |
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<-------------- |
data------------------- |
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Transmit using burst profiles |
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defined in UCD with |
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Configuration Change Count = i |
send UL-MAP with UCD Count ----------- |
UL-MAP------------ |
> |
descriptor with UCD Count = i |
= i |
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previously stored in SS |
<------------- |
data----------------- |
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Transmit using burst profiles |
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defined in UCD with |
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Configuration Change Count = i |
[UCD transition interval expired] |
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send UL-MAP with UCD Count ----------- |
UL-MAP------------ |
> |
delete descriptor with |
= (i+1 MOD 256) |
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Configuration Change Count = i |
<------------- |
data---------------- |
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Transmit using burst profiles |
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defined in UCD with |
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Configuration Change Count = |
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(i+1 MOD 256) |
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Copyright © 2002 IEEE. All rights reserved. |
121 |
IEEE Std 802.16-2001 LOCAL AND METROPOLITAN AREA NETWORKS—PART 16:
Table 65—DCD update
BS |
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SS |
send DL-MAP with DCD Count |
----------- DL-MAP------------ |
> |
descriptor with Configuration |
= i |
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Change Count = i previously |
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stored in SS |
Transmit using burst profiles |
-------------data----------------- |
> |
Receive using burst profiles |
defined in DCD with Configura- |
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defined in DCD with |
tion Change Count = i |
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Configuration Change Count = i |
[change of channel descriptor |
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commanded] |
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send DL-MAP with DCD Count ----------- |
DL-MAP------------ |
> |
descriptor with Configuration |
= i |
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Change Count = i still stored in |
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SS |
send DCD message with Configu- |
-----------DCD------------ |
> |
store new descriptor with |
ration Change Count = (i+1 MOD |
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Configuration Change Count = |
256) |
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(i+1 MOD 256) |
Transmit using burst profiles ------------- |
data---------------- |
> |
Receive using burst profiles |
defined in DCD with |
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defined in DCD with |
Configuration Change Count = i |
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Configuration Change Count = i |
send DL-MAP with DCD Count ----------- |
DL-MAP------------ |
> |
descriptor with Configuration |
= i |
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Change Count = i still stored in |
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SS |
Retransmit DCD message with ----------- |
DCD------------ |
> |
store new descriptor with Con- |
Configuration Change Count = |
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figuration Change Count = (i+1 |
(i+1 MOD 256) |
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MOD 256) |
[DCD transition interval start] |
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Transmit using burst profiles ------------- |
data---------------- |
> |
Receive using burst profiles |
defined in DCD with |
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defined in DCD with |
Configuration Change Count = i |
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Configuration Change Count = i |
[DCD transition interval expired] |
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send DL-MAP with Configura- |
----------- DL-MAP------------ |
> |
delete descriptor with |
tion Change Count = (i+1 MOD |
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Configuration Change Count = i |
256) |
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Transmit using burst profiles ------------- |
data---------------- |
> |
Receive using burst profiles |
defined in DCD with |
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defined in DCD with |
Configuration Change Count = |
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Configuration Change Count = |
i+1 |
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(i+1 MOD 256) |
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6.2.12 Assigning SSs to multicast groups
The BS may add an SS to a Multicast polling group by sending an MCA-REQ message with the Join command. Upon receiving an MCA-REQ message, the SS shall respond by sending an MCA-RSP message. The protocol is shown in Figure 60 and Figure 61.
122 |
Copyright © 2002 IEEE. All rights reserved. |
AIR INTERFACE FOR FIXED BROADBAND WIRELESS ACCESS SYSTEMS |
IEEE Std 802.16-2001 |
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Wait |
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for |
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MCA-REQ |
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MCA-REQ |
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Join |
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Leave |
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Add/ |
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Remove |
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? |
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Add Multicast CID |
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Delete Multicast CID |
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to transmission |
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from transmission |
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opportunities |
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opportunities |
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Yes |
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No |
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Success? |
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Set |
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Set |
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CC to 0 |
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CC to > 0 |
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(OK) |
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(reject-...) |
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MCA-RSP
Wait for
MCA-REQ
Figure 60—Multicast polling assignment—SS
Copyright © 2002 IEEE. All rights reserved. |
123 |
IEEE Std 802.16-2001 |
LOCAL AND METROPOLITAN AREA NETWORKS—PART 16: |
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Wait |
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Assign |
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Remove |
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SS to |
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SS from |
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polling group |
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polling group |
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Start |
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T15 |
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MCA-REQ |
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Wait for |
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MCA-RSP |
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Timeout |
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MCA-RSP |
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T15 |
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Yes |
Retries |
No |
CC=0 |
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available |
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(OK) |
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? |
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No |
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Yes |
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Transaction |
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Transaction |
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Failed |
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Successful |
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Wait |
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Figure 61—Multicast polling assignment—BS
124 |
Copyright © 2002 IEEE. All rights reserved. |