Multimedia traffic including Voice over IP, online games, IP-TV and more, are all time sensitive applications. Therefore, when transmitted over a network the quality of these applications is reliant on end to end Quality of Service (QoS), which is attributed by short latency (delay), minimum variation of latency (Jitter) and lack of packet loss.
Addressing the demand for end to end quality of service (QoS), a network has to prioritize the transmission of time-sensitive application frames over other traffic frames, to minimize their path delay, jitter and packet loss.
The implementation of QoS within a transmission network involves the marking of traffic which is implemented by the traffic source or by an element which identifies the application. Traffic frame classification is then carried out during admission to the transmission network according to the frame marking: The network assigns frames into different queues that have a distinctive set of transmission attributes such as priority. The transmission of frames from each queue is then shaped according to the attributes defined for each queue.
RADWIN 2000* Point-to-Point (PtP) Assures Traffic QoS
User frames entering the PtP IDU port can be marked using 802.1P if needed. The frames are then classified into the following queues: real-time, near-real time, controlled-load, and best-effort.
Rules used to classify traffic are configured by the operator who can assign one or two classifiers to each queue:
Type of Service (ToS) field in the IP packet header
802 1P field in the Ethernet VLAN header
Traffic frames are scheduled from the queues to the air interface in order of priority. Highest priority is given to the real-time traffic queue and lowest priority to the best-effort queue.
To avoid starvation of traffic within lower priority queues, a weight mechanism is used: Each queue is allowed to schedule traffic according to the relative amount of total air-link capacity weight. The weight is configured by the operator while the air-link capacity is continuously evaluated. In addition the operator can limit the Maximum Information Rate (MIR) per each priority queue.
*The feature is supported from version 2.5 and higher in RW 2000C series
Common PtMP wireless solutions, allocate bandwidth over the air in a dynamic manner by assigning air bandwidth to the user terminal only when sending or receiving data.
This approach best exploits the available frequency spectrum. However, in reality, it can’t guarantee service performance attributes such as latency or short term user capacity. In addition, deterioration of a specific user link can reduce the entire sector capacity, and therefore, adversely affect other sector users.
Residential users of wireless PtMP systems mostly surf the Internet. Therefore, they are insensitive to the drawbacks mentioned above. Nevertheless, business applications also include VPNs and time sensitive applications including voice and video. These type of applications demand guaranteed service performance. In other words, low and fixed latency and secured data capacity.
RADWIN 5000 was designed to address business needs and heavy bandwidth applications that require secured SLA.
Using RADWIN 5000 carriers can configure dedicated air-bandwidth per user, according to the requested SLA package. This bandwidth is attributed by the period of time in which a user terminal solely communicates with the base station. Although configurable, this time period is fixed and kept secured per user. The yield capacity and latency in RADWIN 5000 are constant over time and can’t be deteriorated by other sector users or sector data overload. In addition, enhanced QoS ensures traffic prioritization per dedicated data stream.
RADWIN 5000 delivers a high-performance service that is attributed only to PtP links; although it provides an economical solution as known with other PtMP systems. RADWIN 5000 is the best PtMP access solution for the business segment and bandwidth demanding applications.
