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IEEE Std 802.16-2001

LOCAL AND METROPOLITAN AREA NETWORKS—PART 16:

 

 

 

 

Multicast and

 

 

 

 

broadcast polling

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Poll next multicast

 

Yes

BW

group in MAC

 

 

available for

Control block

 

 

 

 

multicast

 

 

 

 

 

 

 

 

polls?

 

 

 

 

 

 

 

 

 

 

 

 

No

 

PHY/MAC

DIUC a

DIUC b

DIUC c

BW

 

CONTROL

Data

 

 

Data

Data

 

No

 

 

 

available for

 

 

 

 

 

 

 

 

broadcast

 

Preamble

DL-

UL-

 

 

 

 

polls?

 

 

 

 

 

 

 

 

 

MAP

MAP

 

 

 

Yes

 

 

 

 

 

 

 

 

 

 

 

 

Uplink Map elements

 

Place broadcast

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

poll in UL-MAP

 

Multicast or Broadcast Poll

 

 

 

 

 

 

 

 

 

 

 

 

Multicast or

No

Reg Cont

BW Req

SS-1

 

 

SS-2

SS-N

broadcast polls

 

Slots

Slots

Data

 

 

Data

Data

set up?

 

 

 

 

 

 

 

 

 

Yes

 

 

 

 

 

 

 

 

 

Monitor Request

 

 

Collision

 

 

 

 

 

Contention

 

 

 

 

 

 

 

SS ID

 

Opportunities

 

 

 

 

 

 

 

 

for BW requests

 

 

 

BW Request

 

 

Connection ID

 

 

 

 

 

Amount

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Valid (non-

No

 

PHY/MAC

DIUC a

DIUC b

DIUC c

collision) BW

 

 

requests?

 

 

CONTROL

Data

 

 

Data

Data

 

 

 

 

 

 

 

 

 

 

Yes

 

 

Preamble

DL-

 

UL-

 

 

 

 

 

 

MAP

 

MAP

 

 

Use BW allocation

 

 

 

 

 

 

 

 

 

algorithm &

 

 

 

 

 

 

 

 

 

change uplink

 

 

 

 

Uplink Map elements

 

subframe map

 

 

 

 

 

 

 

 

 

SS k BW allocation

 

Done

 

 

 

 

 

 

 

 

 

 

Figure 35—Multicast and broadcast polling

6.2.6.4.3 Poll-me bit

SSs with currently active UGS connections may set the poll-me bit [bit PM in the Grant Management Sub-header (6.2.2.2.2)] in a MAC packet of the UGS connection to indicate to the BS that they need to be polled to request bandwidth for non-UGS connections. To reduce the bandwidth requirements of individual polling, SSs with active UGS connections need be individually polled only if the Poll-Me bit is set (or if the interval of the UGS is too long to satisfy the QoS of the SS’s other connections). Once the BS detects this request for polling, the process for individual polling is used to satisfy the request. The procedure by which an SS stimulates the BS to poll it is shown in Figure 36. To minimize the risk of the BS missing the poll-me bit, the SS may set the bit in all UGS MAC Grant Management subheaders in the uplink scheduling interval.

92

Copyright © 2002 IEEE. All rights reserved.

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