Product Info

System Description WipLL Radio Technology - Physical Layer
25030311-08 Airspan Networks Inc. 2-31
2.6.5. Capacity Considerations
This section provides high-level guidelines for evaluating WipLL capacity. This
capacity relates to the number of subscribers supported by a single BSR according to
a certain service mix. The methodology presented here provides a simplified
approach for evaluating WipLL capacity capabilities. It can be used as an initial
estimation; however, it cannot replace a more accurate capacity analysis performed
by an RF planning team.
2.6.5.1. General
The general concept for determining the number of subscribers per BSR is presented
in Figure 2-9.
Aggregate CIR / Over Subscription Factor
Voice Calls * Call BW
BSR Limit (Kbps)
Figure 2-9: Determining number of subscribers per BSR
The BSR limit is 4 Mbps; therefore, the total voice and data bandwidth must be
lower or equal to 4 Mbps.
The number of voice calls should be derived from Erlang B tables according to
voice traffic per subscriber (in erlangs), and expected blocking probability (typically
1%) parameters. The VoIP bandwidth depends on the specific codec that will be
used. Typical values are specified in the next section.
The data portion of the aggregated traffic is based on the sum of the committed
information rate (CIR) for all subscribers assigned to the BSR, divided by the
appropriate over subscription rate.