RuggedCom WiN51 Series, User Manual & Installation Manual

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WiN5200 Product Description | 22
The CPE divides the available frequency band into channels. Allocation of channels during
deployment is dependent on spectrum availability in the licensed band and local licensing
requirements and conditions. Channel selection allows planners to obtain the maximum
geographic coverage, while avoiding frequency contention in adjacent sectors.
2.6 Service Flows
Service flows are a key feature of the 802.16e standard.
A Service Flow represents a unidirectional data flow having separate QoS settings for uplink
and downlink. Service flows provide the ability to set up multiple connections to each
subscriber in a sector.
Separate service flows can be established for uplink and downlink traffic, where each service
flow is assigned a unique service level category and separate QoS settings. This feature allows
segregation of high-speed/high-priority traffic from less time-critical flows.
2.6.1 Service Flow Classification
Data packets are forwarded based on classification rules. Classification rules require
examining each packet for pattern matches such as destination address, source address, IP
TOS, or VLAN tag. All classification is defined at the base station and the classification
parameters are downloaded to the subscriber.
2.6.2 Dynamic Service Addition
Service flows are defined and stored in the base station. For each service flow to be
established, the base station sends a setup message to the subscriber specifying the required
set of QoS parameters. The subscriber responds to each request by accepting or rejecting the
setup message.
A service flow may be pre-provisioned or can be dynamically created and deleted without
service outage. This is useful for supporting multiple subscribers in a single sector. New
subscribers can be added and existing subscribers can be removed or have service levels
modified.
Setup messages are sent by the base station following any subscriber power-cycle, loss and
recovery of the wireless link to a subscriber, or any service flow add/delete operation at the
base station.