Redline Communications Inc. AN100UXA Manual Do Utilizador
User
AN-100U/UX Base Station
Manual
70-00058-01-04
Proprietary Redline Communications © 2010
Page 110 of 136
April 19, 2010
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7.1
Uplink Subchannelization (AN-100UX only)
The uplink subchannelization (USC) feature provides opportunities to increase sector
uplink throughput and establish wireless links to medium and low signal subscribers.
This feature is available for all subscribers running software v2.1 or higher.
uplink throughput and establish wireless links to medium and low signal subscribers.
This feature is available for all subscribers running software v2.1 or higher.
Uplink Subchannels
In standard mode, the base station maps timeslots during which a single subscriber is
permitted to transmit using all data subcarriers. The USC feature organizes the 192 data
subcarriers into 16 groups. During each USC timeslot, selected subscribers are
scheduled to transmit on 1, 2, 4, or 8 subchannel groups (see following table).
permitted to transmit using all data subcarriers. The USC feature organizes the 192 data
subcarriers into 16 groups. During each USC timeslot, selected subscribers are
scheduled to transmit on 1, 2, 4, or 8 subchannel groups (see following table).
Table 54: Op Notes: Uplink Subchannelization Subchannel Group
Assignment
Designation in SSInfo screen
1/16 [o]
1/8 [o]
1/4 [o]
1/2 [o]
Number of assigned subchannels
1
2
4
8
Concentrating the Tx power in subchannels provides a real gain of 7-10 dB in the
subscriber uplink signal. This added gain enables use of higher modulations and can
improve uplink throughput rates.
subscriber uplink signal. This added gain enables use of higher modulations and can
improve uplink throughput rates.
Table 55: Op Notes: Subchannelization Uplink Bandwidth Improvement
SS Info Label
USC Disabled
USC Enabled
Full
Up to 64 QAM
Up to 64 QAM
Optional
BPSK, QPSK, 16 QAM 1/2
Up to 64 QAM
Mandatory
No Link
BPSK 1/2 or QPSK 1/2
When USC is enabled, the base station classifies all subscribers based on the uplink
signal quality (CINR, SNR, etc.). A column in the SS Info page identifies subscribers as
'full', 'optional', or 'mandatory', and indicates the number of assigned subchannels:
signal quality (CINR, SNR, etc.). A column in the SS Info page identifies subscribers as
'full', 'optional', or 'mandatory', and indicates the number of assigned subchannels:
Full: Subscribers able to establish a 16 QAM 3/4 or 64 QAM link without USC are
tagged as 'full' and are not included in any USC scheduling.
tagged as 'full' and are not included in any USC scheduling.
Optional: Subscribers with signal strength sufficient to establish BPSK or QPSK
links without USC are tagged as 'optional'. These subscribers are candidates for
traffic optimization. The increased gain available using the USC feature may enable
these subscribers to transmit at modulations up to 64 QAM.
links without USC are tagged as 'optional'. These subscribers are candidates for
traffic optimization. The increased gain available using the USC feature may enable
these subscribers to transmit at modulations up to 64 QAM.
Mandatory: Subscribers that can not establish a stable wireless link without benefit
of the increased uplink gain provided by the USC feature are tagged 'mandatory'.
These subscribers will only transmit during USC scheduled timeslots. Traffic from
these subscribers is scheduled as Best Effort (regardless of service flow settings)
and the highest available modulation is QPSK 1/2.
of the increased uplink gain provided by the USC feature are tagged 'mandatory'.
These subscribers will only transmit during USC scheduled timeslots. Traffic from
these subscribers is scheduled as Best Effort (regardless of service flow settings)
and the highest available modulation is QPSK 1/2.