Redline Communications Inc. AN100UXA 用户手册
User
AN-100U/UX Base Station
Manual
70-00058-01-04
Proprietary Redline Communications © 2010
Page 23 of 136
April 19, 2010
A wireless link is considered non LOS if natural or man-made structures block the visible
path between the base station and the subscriber. In this case, a wireless link can be
established only if a reflective path can be established between the base station and
subscriber.
path between the base station and the subscriber. In this case, a wireless link can be
established only if a reflective path can be established between the base station and
subscriber.
Figure 6: System - Non-Line of Sight Deployment
2.7
Service Flows
Service flows are a key feature of the 802.16 standard. A service flow represents a
unidirectional data flow between the base station and subscriber. Downlink service flows
control traffic flow from the base station to the subscriber. Uplink service flows control
traffic flow from the subscriber to the base station. Bidirectional data flow requires that
two service flows be defined: one for the uplink, and another for the downlink. Each
service flow is assigned unique QoS settings.
unidirectional data flow between the base station and subscriber. Downlink service flows
control traffic flow from the base station to the subscriber. Uplink service flows control
traffic flow from the subscriber to the base station. Bidirectional data flow requires that
two service flows be defined: one for the uplink, and another for the downlink. Each
service flow is assigned unique QoS settings.
The base station allows multiple service flows to be configured for each subscriber in a
sector. This allows service providers to offer different service levels and segregate traffic
flows having different QoS requirements.
sector. This allows service providers to offer different service levels and segregate traffic
flows having different QoS requirements.
A service flow is partially characterized by the following attributes:
1.
A 32-bit Service Flow ID (SFID) is assigned to all existing service flows. The SFID
serves as the principal identifier for the Service Flow and has an associated
direction.
serves as the principal identifier for the Service Flow and has an associated
direction.
2.
A 16-bit Connection ID (CID) is associated with each active SFID (connection
active).
active).
3.
A set of QoS parameters specifying the required resources. The principal resource
is bandwidth, but the specification may also include latency requirements.
is bandwidth, but the specification may also include latency requirements.
4.
A set of QoS parameters defining the level of service being provided.