3.2 DCD Allocation Settings

When Auto Allocation is on in the zone editing window, an algorithm configures the bursts automatically based on the number of occupied slots and maximum number of subchannels available in the zone, avoiding any burst overlap where possible. If Auto Allocation is off, you can manually position and allocate the data region by editing the number of symbols, subchannels, and their respective offsets.

You can view the automatic or manual Closedburst allocation configurations in the zone plot view. Any bursts that overlap, exceed the number of assigned slots, or are too small are shown in red. Click Status Windowin the tool bar for suggestions to resolve any conflicts.

In version 1.9.0.1 or earlier, the N7615A/B included the DCD as part of the DL-MAP message when present. In this version, DCD is now a separate burst from the DL-MAP, following the DL-MAP and UL-MAP if present.

If you save a settings file using the 1.9.0.1 or earlier version with DL-MAP, UL-MAP, DCD and UCD all turned on, and the Auto Allocation turned Off, when you import this settings file using this version, there will be a warning message, "DCD or UCD is out of range". This is due to the different allocation schemes. To solve this problem, just increase the Number of Symbols of the PUSC zone and properly allocate the DCD and UCD.

Number of Symbols

If Auto Allocation is off in the zone editing window, use this cell to select the number of symbols to be used for the burst.

Symbol Offset

If Auto Allocation is off in the zone editing window, use this cell to manually position the burst on the horizontal axis (x), if necessary, to avoid any burst overlap.

Number of Subchannels

If Auto Allocation is off in the zone editing window, use this cell to select the number of subchannels to be used for the burst.

Subchannel Offset

If Auto Allocation is off in the zone editing window, use this cell to manually position the burst on the vertical axis (y), if necessary, to avoid any burst overlap.

Assigned Slots

Displays the total available Closedslots in this burst based on the number of symbols times the number of subchannels selected.

The definition of an OFDMA slot depends on the OFDMA symbol structure, which varies for downlink and uplink:

When Auto Allocation is set to on in the zone editing window, an algorithm configures the bursts automatically using the specified burst parameters, avoiding any burst overlap, if possible. If Auto Allocation is off, you can manually position and allocate the data region by selecting the number of assigned slots for the zone and the number of symbols and subchannels with their respective offsets in the burst editing window. Any bursts that overlap, exceed the assigned number of slots, or are too small are shown in red and the status bar and parameter status window display a conflict message.

Occupied Slots

Displays how many Closedslots are needed for the burst based on the total length in bytes of all MAC PDUs. It also depends on the rate ID and coding type selected for each burst.

The definition of an OFDMA slot depends on the OFDMA symbol structure, which varies for downlink and uplink:

When Auto Allocation is set to on in the zone editing window, an algorithm configures the bursts automatically using the specified burst parameters, avoiding any burst overlap, if possible. If Auto Allocation is off, you can manually position and allocate the data region by selecting the number of assigned slots for the zone and the number of symbols and subchannels with their respective offsets in the burst editing window. Any bursts that overlap, exceed the assigned number of slots, or are too small are shown in red and the status bar and parameter status window display a conflict message.