Radwin 5000 HPMP - About HBS Overhead; Figure 10-23 Example 3: Half

RADWIN5000HPMPUserManual Release3.5.70 10‐20
AboutHBSOverhead
AboutHBSOverhead
Thereisalw ayssomeoverheadontheHBS.Recallthatonetimeslotineachoftheuplinkand
downlinkdirectionsisreservedbytheHBSforsectormanagement.
InourfourexampleswenotedthattheoccurrenceofHBSoverheadincreaseswhen
allocatingtimeslotsevento“idle”HSUs.
Aswesaw,thepercentagepointsectorloadincreasesasyouallocatefurtherdownlinktime
slots,ormaintainanyunusedbutallocateduplinktimeslots.
Itisstraightforwardtodemonstratethatoverheadisalsochannel‐bandwidthdependent.If
yourepeatthefourexamplesunder10and5MHzchannelbandwidth,theloadoverhead
percentageincreasesaschannelbandwidthdecreases.Conversely,ifyouareabletooperate
at40MHz,theoverheadpercentagedrops.
Toillustratetheeffectofdifferentchannelbandwidths,weshowinorder,Example3at10,20
and40MHz:
Figure10‐23:Example3:Halftheuplinktimeslotsreservedat10MHzCBW
Noticethatat10MHzchannelbandwidth,thesectorutilizationis100%inbothdirections!