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AIR INTERFACE FOR FIXED BROADBAND WIRELESS ACCESS SYSTEMS

IEEE Std 802.16-2001

11.1.2 DCD message encodings

The DCD message encodings are specific to the DCD message (see 6.2.2.3.1).

11.1.2.1 DCD channel encodings

The DCD Channel Encoding are provided in Table 124.

Table 124—DCD channel encodings

Name

Type

Length

Value

(1 byte)

(variable-length)

 

 

 

 

 

 

 

 

 

May appear more than once; described below. The length is

Downlink_Burst_Profile

1

 

the number of bytes in the overall object, including

 

 

 

embedded TLV items.

 

 

 

 

BS Transmit Power (aver-

2

1

Signed in units of 1 dBm.

age)

 

 

 

 

 

 

 

 

Burst FDD/TDD frame

4

4

The number of PSs contained in a Burst FDD or TDD

duration

frame. Required only for framed downlinks

 

 

 

 

 

 

PHY Type

5

1

The PHY Type to be used.

 

 

 

 

power adjustment rule

9

1

0=Preserve Peak Power

 

 

 

1=Preserve Mean Power

 

 

 

Describes the power adjustment rule when performing a

 

 

 

transition from one burst profile to another.

 

 

 

 

Copyright © 2002 IEEE. All rights reserved.

275

IEEE Std 802.16-2001

LOCAL AND METROPOLITAN AREA NETWORKS—PART 16:

11.1.2.2 Downlink burst profile encodings for 10–66 GHz systems

The downlink burst profile encodings for 10–66 GHz systems are provided in Table 125.

Table 125—Downlink_Burst_Profile encodings

Name

Type

Length

 

Value

(1 byte)

 

(variable-length)

 

 

 

 

 

 

 

 

 

 

 

1

= QPSK

Modulation Type

1

1

2

= 16-QAM

 

 

 

3

= 64-QAM

 

 

 

 

 

 

 

 

1

= Reed–Solomon only

 

 

 

2

= Reed–Solomon + Inner Block Convolutional Code

FEC Code Type

2

1

 

(BCC)

3

= Reed–Solomon + Inner (9,8) Parity Check Code

 

 

 

 

 

 

4

= Block Turbo Code (Optional)

 

 

 

5–255 = Reserved

 

 

 

 

RS information bytes (K)

3

1

K=6–255

 

 

 

 

RS Parity Bytes (R)

4

1

R = 0–32 (error correction capability T = 0–16)

 

 

 

 

 

BCC code type

5

1

1

= (24,16)

2–255 = Reserved

 

 

 

 

 

 

 

 

 

 

 

1

= (64,57) Extended Hamming

BTC Row code type

6

1

2

= (32,26) Extended Hamming

 

 

 

3–255 = Reserved

 

 

 

 

 

 

 

 

1

= (64,57) Extended Hamming

BTC Column code type

7

1

2

= (32,26) Extended Hamming

 

 

 

3–255 = Reserved

 

 

 

 

 

BTC Interleaving type

11

1

1

= No interleaver, 2 = Block Interleaving,

3–255 = Reserved

 

 

 

 

 

 

 

 

 

 

1=fixed; 2=shortened allowed (optional)

Last codeword length

12

1

This allows for the transmitter to shorten the last

 

 

 

codeword, based upon the allowable shortened

 

 

 

codewords for the particular code type.

 

 

 

 

 

 

 

C/(N+I) at or below which this DIUC can no longer be

DIUC mandatory exit threshold

13

1

used and at which a change to a more robust DIUC is

 

 

 

required, in 0.25 dB units. See Figure 59.

 

 

 

 

 

 

 

The minimum C/(N+I) required to start using this DIUC

DIUC minimum entry threshold

14

1

when changing from a more robust DIUC is required, in

 

 

 

0.25 dB units. See Figure 59.

 

 

 

 

 

 

 

 

0

= burst not preceded with preamble

Preamble presence

15

1

1

= burst preceded with preamble. If the preamble is

 

 

 

 

 

 

present, it consumes the first PSs of the interval.

 

 

 

 

 

276

Copyright © 2002 IEEE. All rights reserved.

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