Redline Communications Inc. SUOA Manuale Utente
Red
MAX
™
Subscriber Modem
SU-O User Manual
70-00057-01-01-DRAFT
Proprietary Redline Communications © 2007 September
7,
2007
Page 18 of 55
allows planners to obtain the maximum geographic coverage, while avoiding frequency
contention in adjacent sectors.
contention in adjacent sectors.
2.3 Service
Flows
Service flows are a key feature of the 802.16 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.
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.
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.
2.3.1 Service
Flow
Classification
Data packets are forwarded by the subscriber based on classification rules. Classification
rules require examining each packet for pattern matches such as destination address,
source address, or VLAN tag. All classification is defined at the base station and the
classification parameters are downloaded to the subscriber.
rules require examining each packet for pattern matches such as destination address,
source address, or VLAN tag. All classification is defined at the base station and the
classification parameters are downloaded to the subscriber.
RedMAX supports service flows with different classification types including: 802.3
Ethernet, 802.1Q VLAN, IPV4, IPV4 Over 802.3 and IPV4 Over 802.1Q -- with options
to classify based on Source and Dest of MAC and IP addresses, VLAN tag and Vlan
priority, Src and Dst port number, TOS Value and Ethernet protocol type.
Ethernet, 802.1Q VLAN, IPV4, IPV4 Over 802.3 and IPV4 Over 802.1Q -- with options
to classify based on Source and Dest of MAC and IP addresses, VLAN tag and Vlan
priority, Src and Dst port number, TOS Value and Ethernet protocol type.
2.3.2 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.
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.
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.
and recovery of the wireless link to a subscriber, or any service flow add/delete operation
at the base station.
2.3.3 Uplink Service Flow Scheduling
The base station enforces QoS settings for each service flow by controlling all uplink and
downlink traffic scheduling. This provides non-contention based traffic model with
predictable transmission characteristics. By analyzing the aggregate requests of all
subscribers, the base station ensures that uplink and downlink traffic conforms with the
current service level agreements (SLAs). Centralized scheduling increases traffic
predictability, eliminates contention, and provides maximum opportunity for reducing
overhead.
downlink traffic scheduling. This provides non-contention based traffic model with
predictable transmission characteristics. By analyzing the aggregate requests of all
subscribers, the base station ensures that uplink and downlink traffic conforms with the
current service level agreements (SLAs). Centralized scheduling increases traffic
predictability, eliminates contention, and provides maximum opportunity for reducing
overhead.