AIR INTERFACE FOR FIXED BROADBAND WIRELESS ACCESS SYSTEMS |
IEEE Std 802.16-2001 |
Table 61—Ranging and automatic adjustments procedure (continued)
BS |
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SS |
send map with Station |
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UL-MAP------------ |
> |
recognize own Basic CID in |
Maintenance information element |
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map |
to SS using Basic CID |
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<--------- |
RNG-REQ------- |
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reply to Station Maintenance |
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opportunity poll |
send ranging response |
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RNG-RSP------- |
> |
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adjust local parameters |
send periodic transmission oppor- |
------------UL-MAP----------- |
> |
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tunity to broadcast address |
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NOTES:
1—The BS shall allow the SS sufficient time to have processed the previous RNG-RSP (i.e., to modify the transmitter parameters) before sending the SS a specific ranging opportunity. This is defined as SS Ranging Response Processing Time in Table 118.
2—For multichannel support, the SS shall attempt initial ranging on every suitable uplink channel before moving to the next available downlink channel.
On receiving a RNG-RSP instruction to move to a new downlink frequency and/or uplink channel ID, the SS shall consider any previously assigned Basic, Primary Management, and Secondary Management CIDs to be deassigned, and shall obtain new Basic, Primary Management, and Secondary Management CIDs via initial ranging and registration.
It is possible that the RNG-RSP may be lost after transmission by the BS. The SS shall recover by timing out and reissuing its Initial RNG-REQ. Since the SS is uniquely identified by the source MAC address in the Ranging Request, the BS may immediately reuse the Basic, Primary Management, and Secondary Management CIDs previously assigned. If the BS assigns new Basic, Primary Management, and Secondary Management CIDs, it shall make some provision for aging out the old CIDs that went unused.
6.2.9.6 Ranging parameter adjustment
Adjustment of local parameters (e.g., transmit power) in an SS as a result of the receipt (or nonreceipt) of a RNG-RSP is considered to be implementation-dependent with the following restrictions:
a)All parameters shall be within the approved range at all times.
b)Power adjustment shall start from the minimum value unless a valid power is available from non-volatile storage, in which case this shall be used as a starting point.
c)Power adjustment shall be capable of being reduced or increased by the specified amount in response to RNG-RSP messages.
d)If, during initialization, power is increased to the maximum value (without a response from the BS) it shall wrap back to the minimum
On receiving a RNG-RSP, the SS shall not transmit until the RF signal has been adjusted in accordance with the RNG-RSP and has stabilized.
Copyright © 2002 IEEE. All rights reserved. |
109 |
IEEE Std 802.16-2001 |
LOCAL AND METROPOLITAN AREA NETWORKS—PART 16: |
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Wait for Initial or |
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Timeout |
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UL-MAP with |
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opportunity |
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Error |
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Send |
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RNG-REQ |
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Wait for |
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REQs from multiple SSs collided. To avoid these |
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SS repeating the loop in lockstep, a random back- |
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off is required. This is a backoff over the ranging |
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window specified in the UL-MAP. |
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T3 timeouts can also occur during multchannel operation. On a system with multiple uplink channels, the SS shall attempt initial ranging on every suitable uplink channel before moving to the next available downlink channel.
Timeout |
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Relates to Contention |
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Ranging Retries |
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Yes |
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RNG-RSP |
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exhausted |
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Continue |
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Success/ |
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Error |
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Abort? |
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MAC |
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Reinitialize |
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[note] |
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MAC |
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Adjust local |
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parameters per |
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RNG-RSP |
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increase |
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power? |
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Adjustment |
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Yes |
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At max. |
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Power
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Send |
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RNG-REQ |
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with anomalies |
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power |
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Continue |
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Success or |
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continue? |
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Wait for Initial or |
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Success |
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Station |
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Maintenance |
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opportunity |
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Ranging |
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Figure 50—Initial Ranging—SS
110 |
Copyright © 2002 IEEE. All rights reserved. |
AIR INTERFACE FOR FIXED BROADBAND WIRELESS ACCESS SYSTEMS |
IEEE Std 802.16-2001 |
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Wait for |
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recognizable |
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RNG-REQ |
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RNG-REQ |
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Yes |
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No |
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CID assigned |
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to this SS |
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yet? |
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Assign |
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Management |
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CIDs |
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Reset retry count |
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in poll list for |
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this SS |
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Add SS to poll |
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list for future |
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maps |
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Send RNG-RSP |
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(continue) |
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Map shall be sent per allocation |
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algorithm and pending until |
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complete. (Note 2) |
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Wait for polled |
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RNG-REQ |
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not received |
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Retries |
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Good |
Yes |
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exhausted? |
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Yes |
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Retries |
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exhausted |
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from poll list |
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(continue) |
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Wait for polled |
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RNG-REQ |
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Done
NOTES:
1—Means ranging is within the tolerable limits of the BS.
2—RNG-REQ pending-until-complete was nonzero, the BS should hold off the station maintenance opportunity accordingly unless needed, for example, to adjust the SS’s power level.
3—“Retries exhausted?” conditional refers to the “Invited Ranging Retries” entry of Table 118.
Figure 51—Initial Ranging—BS
Copyright © 2002 IEEE. All rights reserved. |
111 |