Redline Communications Inc. AN100UA 用户手册
Red
MAX
™
Base Station
User Manual
Doc. #70-00058-01-01
Proprietary Redline Communications © 2007
July 13, 2007
Page 24 of 117
silence suppression. This is efficient for applications that have a real-time component and
continuously changing bandwidth requirements.
continuously changing bandwidth requirements.
Non-Real-Time Polling Service (nrt-PS)
The base station schedules regular transmit opportunities for the subscriber to send
variable size data packets. Typical applications may include high bandwidth FTP. The
polling period may typically be one second or less, even during periods of network
congestion.
variable size data packets. Typical applications may include high bandwidth FTP. The
polling period may typically be one second or less, even during periods of network
congestion.
Best Effort (BE)
The base station schedules transmit opportunities for the subscriber to send traffic based
on unused bandwidth after all higher level traffic scheduling requirements are serviced.
Typical applications may include Internet access and email. Best effort service flows can
be assigned a priority of 0 to 7.
on unused bandwidth after all higher level traffic scheduling requirements are serviced.
Typical applications may include Internet access and email. Best effort service flows can
be assigned a priority of 0 to 7.
Unsolicited Grant Service (UGS)
The base station schedules a continuous series of transmit opportunities for the subscriber
to send fixed size data packets. This schedule supports real-time applications including
VoIP or TDM transport. The UGS pre-scheduled grants guarantee reserved bandwidth
and reduce latency introduced by repetitive grant requests. The service flow will not
transmit packets larger than nominal grant interval.
to send fixed size data packets. This schedule supports real-time applications including
VoIP or TDM transport. The UGS pre-scheduled grants guarantee reserved bandwidth
and reduce latency introduced by repetitive grant requests. The service flow will not
transmit packets larger than nominal grant interval.
Traffic Scheduling Algorithm
The base station scheduling algorithm uses two scheduling passes. On the first pass, the
scheduler attempts to allocate bandwidth to meet the minimum rates for all active service
flows. If there is available bandwidth remaining at the end of the first pass, the scheduler
executes a second pass and attempts meet all specified maximum rates. During both
passes, bandwidth allocations are assigned based on the following order of assessment:
1. Priority of the scheduling service type, from highest to lowest (rtPS first, and then
scheduler attempts to allocate bandwidth to meet the minimum rates for all active service
flows. If there is available bandwidth remaining at the end of the first pass, the scheduler
executes a second pass and attempts meet all specified maximum rates. During both
passes, bandwidth allocations are assigned based on the following order of assessment:
1. Priority of the scheduling service type, from highest to lowest (rtPS first, and then
BE).
2. Traffic Priority setting when multiple service flows have the same service type.
Wireless transmission bandwidth is optimized by granting allocations based only on
traffic available for immediate transmission: only the required bandwidth is allocated,
and idle service flow channels do not receive any bandwidth allocation.
Wireless transmission bandwidth is optimized by granting allocations based only on
traffic available for immediate transmission: only the required bandwidth is allocated,
and idle service flow channels do not receive any bandwidth allocation.