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