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WiMAX UCD,UIUC,DCD,DIUC

This page describes wimax channel descriptors UCD, UIUC, DCD and DIUC. It mentions various fields used in UCD, UIUC, DCD and DIUC. This is as per fixed wimax standard IEEE 802.16 MAC layer specifications.

WiMAX UCD-Uplink Channel Descriptor & DCD-Downlink Channel Descriptor

These channnel descriptors indicate modulation-code rate information of bursts. UCD/UIUC indicate modulation-code rate information of uplink burst profiles. DCD/DIUC indicate modulation-code rate information of downlink burst profiles.


WiMAX UCD Fields WiMAX DCD Fields
Generic MAC Header(6 bytes) Generic MAC Header(6 bytes)
UCD Type(8 bits) DCD Type(8 bits)
CCC(8 bits) DL channel ID (8 bits)
Ranging Back off start(8 bits) CCC(8 bits)
Ranging Back off End(8bits) Base station EIRP
Request Back Off Start(8bits) downlink center frequency
Request Back Off End(8bits) BS ID
Contention based reservation time out Frame duration code
Contention ranging request opportunity size MAC version
Contention ranging request burst size frame number
Uplink center frequency CRC
CRC(4 bytes)

WiMAX UIUC-Uplink Interval Usage Code

Following table mentions UIUC values with their usage.


UIUC Value Usage/Function
0 reserved
1 Initial ranging
2 REQ Region Full
3 REQ region focused
4 Focused contention IE
5-12 UCD Burst profiles
13 subchannelization network entry
14 End of Map
15 Extended UIUC

WiMAX DIUC-Downlink Interval Usage Code

Following table mentions DIUC values with their usage.


DIUC Value Usage/Function
0 STC Zone
1-11 DCD Burst profiles
12 reserved
13 Gap
14 End of Map
15 Extended DIUC

UCD burst profile encoding for OFDM =
{ FEC code rate(TLV format), DIUC mandatory exit threshold, DIUC min. entry threshold, TCS_enable}
HERE,
FEC code type = {150,1,FEC_value}
Here FEC_value = 0 for BPSK 1/2, 1 for QPSK 1/2, 2 for QPSK 3/4, 3 for 16QAM 1/2, 4 for 16QAM 3/4, 5 for 64QAM 2/3, 6 for 64QAM 3/4 and so on}

DCD burst profile encoding for OFDM =
{FEC code rate, DIUC mandatory exit threshold, DIUC min. entry threshold, TCS_enable}

What is Difference between

difference between FDM and OFDM
Difference between SC-FDMA and OFDM
Difference between SISO and MIMO
Difference between TDD and FDD
Difference between 802.11 standards viz.11-a,11-b,11-g and 11-n
Bluetooth vs zigbee
Bluetooth vs zigbee
wibro vs mobile wimax
Microcontroller vs microprocessor
FDMA vs TDMA vs CDMA
FDM vs TDM
CDMA vs GSM
OFDM vs OFDMA
wimax vs lte

Links to WiMAX MAC Layer resources

REG REQ and REG RSP
SBC REQ and SBC RSP
DSA REQ and DSA RSP
UCD,UIUC,DCD,DIUC
DLMAP and ULMAP
WiMAX Ranging Procedure
WiMAX Bandwidth Request procedure
WiMAX Network Entry Procedure
WiMAX CID vs SFID
WiMAX FCH header format
WiMAX TLV Format basics
WiMAX Timers
WiMAX Network Interface types
WiMAX QoS Classes

               

RF and Wireless Terminologies


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