Wireless Outdoor Router Protocol, commonly known as WORP® is Proxim’s wireless protocol that is embedded in every Proxim Tsunami® outdoor product. It has been specifically designed and engineered from the ground up to optimize the performance of multi-play (voice, video, data) outdoor wireless Point-to-Point (PtP) and Point-to-Multipoint (PtMP) links.
Guaranteed Quality-of-Service (QoS)
WORP® ensures all application data receive the QoS treatment they require to operate properly. QoS in this instance means minimum and maximum data rates, jitter and latency control, and operating within a defined packet loss/ error rate. This is accomplished by conducting deep packet inspection on every packet, identifying the application type, and then enforcing the QoS rules that have been defined for that traffic. There are three primary components to WORP® QoS:
- Packet Identification Rules (PIRs) or Deep Packet Inspection (DPI), which classifies the traffic
- Service Flow Classes (SFCs), which define priority, band width, latency and jitter for the traffic
- Quality-of-Service Classes (QoSCs) that define which of these SFCs will be used for which traffic, classified by set of PIRs. There is also a table that defines which QoSC will be assigned to which particular Subscriber unit during registration.
The WORP® protocol is extremely efficient, more so than WiFi or LTE. With WiFi and LTE, for every 100Mbps of over-the-air data, only about 50Mbps is available for use. In the same scenario, a WORP® system delivers 75Mbps of useable Ethernet traffic. Simply put, WORP® based solutions make available almost up to 50% more bits in a network.
WORP® offers a variety of features to ensure unparalleled security. First, the protocol is not publicized or standardized, which makes it less vulnerable to hackers than any standards based system. To decode a WORP® signal, a WORP® enabled device must be used. Second, WORP® requires the Subscriber unit to register on the BSU (base station unit), performing a mutual authentication with identification via an MD-5 secret string. Both know that their peer belongs to the network (avoiding both rogue Subscriber units and BSUs). Third, WORP® implements 128-bit or 256-bit encryption to all data sent over the wireless link. Fourth, Access Control (authentication) occurs locally or via a RADIUS server. Finally, all remote management methods use secure versions and are password-protected SSH, HTTPS and SNMP v3 are used for remote management and access.
An outdoor point-to-multipoint solution based on WiFi 802.11 MAC protocol may connect from 5 to 10 remote nodes. In heavy traffic deployments, however, performance starts to suffer due to packet collisions, with as few as 2 remote nodes. A solution using WORP®, on the other hand, can connect over 100 remote nodes without adverse effects on usable bandwidth, allowing more concurrent Subscriber units to be active in a wireless multipoint environment.
Scalability also means that as the system adopts greater loads in terms of the number of subscribers, the total aggregate data available remains constant. Take the example posited above. In a WiFi based network with 2 or 3 or even a few more subscribers, the aggregate data rate of all users will be close to 50Mbps. If we take that same WiFi network with 50 end users, the aggregate total data rate for all end users drops to the range of 25Mbps. This is a function of the WiFi MAC protocol.
In a WORP® based network, whether there are 2 subscribers or 50, the total aggregate data rate remains the same. In the example above, for a 100Mbps over the air rate, with 75Mbps of useable data, whether 15 or 100 subscribers, the total available bandwidth remains 75Mbps.
Hidden Node Problem
WiFi was designed for short range indoor applications. Inherent to the WiFi MAC protocol is the assumption that all clients can “hear” each other. With this assumption WiFi operates on a Carrier Sense Multiple Access Collision Avoidance technique. Simply put, each client device listens to the radio waves. If it does not hear any other devices communication it assumes the channel is clear and begins transmission.
For outdoor networks, this assumption that all Subscriber units can hear each other is flawed. It is much more often the case that an Subscriber unit with it's directional antenna and obstacles such as buildings and trees, cannot “hear” the other subscriber devices. As a result multiple Subscriber units will attempt to access the wireless medium at the same time, interfering with each other, resulting in re-transmissions and a large impact on network performance.
Conversely the WORP® protocol controls all communications on the wireless channel by putting total control in the BSU. No Subscriber unit transmits data unless the BSU gives it permission and as a result there are no collisions and hence no re-transmissions. For outdoor networks this centralized control is critical to ensure proper network performance.
WORP® - Connecting the Internet of Things