Terminology - Radwin 5000 HPMP User Manual

Terminology

Terminology
• A Point to Multipoint network is typically abbreviated to PtMP. The PtMP networks
described in this Manual are of course, radio links.
• A PtMP link consists of at least one Base Station (BS) radio linked to several Subscriber
Unit (SU) radios. The SUs are sometimes called Customer Premises Equipment (CPEs).
The terminology comes from the field of telephony.
• The RADWIN 5000 HPMP product suite provides the highest capacity and spectrum effi‐
ciency available in the Point to Multipoint sub‐6 GHz band. We distinguish between
generic BSs and SUs and RADWIN units, relabeling the former to HBS and the latter to
HSUs (H = high capacity).
• The radio links are effected by using a sector antenna with the HBS. The HSUs use direc‐
tional antennas aligned to the HBS.
• A Sector consists of a HBS and a group of HSUs within the angular sector covered by the
HBS antenna. A Sector is typically 60°, 90° or 120° depending on the choice of antenna.
• HBSs may be collocated to provide sectorial coverage up to 360°.
The RF characteristics of a Sector will be common to each radio: Frequency (regulation),
band and channel bandwidth. Adjacent Sectors in a PtMP network will typically use
different frequencies and non‐overlapping bands to mitigate HBS self interference.
• A HSU may be defined as fixed, nomadic or mobile.
• A fixed HSU is just that ‐ installed at a fixed location.
• A nomadic HSU is attached to a vehicle that moves about within a sector and across sec‐
tors inside a well defined area. Service is provided when the vehicle is stationary.
• A mobile HSU (HMU) provides service while the vehicle to which it is attached is moving
or stationary. The vehicle is typically a railway carriage, a car (automobile) or a ship. A
class of HMUs, Vehicular Mobile Units (VMU) provide WiFi service and include an inte‐
grated GPS unit.
• Downlink traffic is data transfer from an HBS to an HSU.
• Uplink traffic is data transfer from an HSU to an HBS.
• Time slots are assigned to each HSU to prioritize them. 63 time slots are available in
each of the uplink and downlink directions.
• For each fixed or nomadic HSU, Assured throughput is determined by the actual num‐
ber of time slots allocated to it in either direction. Peak throughput (higher than
Assured throughput) may be achieved by allocating unused downlink time slots or unal‐
located uplink time slots to very busy HSUs. This process is called Smart Bandwidth
Management (SBM). SBM takes up one time slot in each direction.
RADWIN 5000 HPMP User Manual Release 3.5.70 1‐3