Alvarion Technologies Ltd. BMAX-BA36 Manuale Utente
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BreezeMAX Modular Base Station System Manual
169
4.9.5.3.4.3
Minimum Number of Sub-Channels
The system supports Sub-Channelization (OFDMA) in the uplink, providing two
advantages:
advantages:
Ability to connect SUs with relatively poor link conditions: reducing the
amount of uplink sub-channels from 16 (full bandwidth) to 8, 4, 2 or 1
sub-channels enables increasing the maximum transmit power of the SU by 3,
6, 9 or 12 dBm, respectively.
amount of uplink sub-channels from 16 (full bandwidth) to 8, 4, 2 or 1
sub-channels enables increasing the maximum transmit power of the SU by 3,
6, 9 or 12 dBm, respectively.
Better utilization of uplink capacity, by enabling several SUs to share the
bandwidth at the same time.
bandwidth at the same time.
The available options are 1, 2, 4, 8, and 16 (full bandwidth) sub-channels. A value
of 16 means that sub-channelization is disabled.
of 16 means that sub-channelization is disabled.
The default is 1 sub-channels (full OFDMA support).
Changes in Minimum Number of Sub-channels are applied only after reset.
4.9.5.3.4.4
Downlink Basic Rate
The Downlink Basic Rate is the minimum rate to be used by the Multirate
algorithm in all downlinks. This is also the rate to be used for downlink
broadcasts and multicasts. Multicasts and broadcasts are sent to multiple
recipients with different link qualities. Therefore, it is preferable to use a relatively
low rate for these transmissions, thus reducing the probability of errors and
increasing the likelihood that all intended recipients will receive them properly.
This is also the initial rate to be used by the algorithm for each new SU that joins
the cell when the Multirate algorithm is enabled.
algorithm in all downlinks. This is also the rate to be used for downlink
broadcasts and multicasts. Multicasts and broadcasts are sent to multiple
recipients with different link qualities. Therefore, it is preferable to use a relatively
low rate for these transmissions, thus reducing the probability of errors and
increasing the likelihood that all intended recipients will receive them properly.
This is also the initial rate to be used by the algorithm for each new SU that joins
the cell when the Multirate algorithm is enabled.
The default rate is the lowest rate BPSK 1/2 (rate 1).
4.9.5.3.5
Voice Parameters
4.9.5.3.5.1
Maximum Number of Voice Calls
The Maximum Number of Voice Calls parameter sets the upper limit of
simultaneous voice calls that will be supported by the AU. This parameter is
applicable only to DRAP based voice calls, and is not applicable for units
operating in IP CS Switching Mode.
simultaneous voice calls that will be supported by the AU. This parameter is
applicable only to DRAP based voice calls, and is not applicable for units
operating in IP CS Switching Mode.
The range is from 0 to 300 Voice Calls.
The default is 50.
4.9.5.3.5.2
AU Minimum Allocation
The AU Minimum Allocation parameter defines the minimum allocation of
symbols in the uplink: 5 symbols for typical data only services, or 3 symbols for
symbols in the uplink: 5 symbols for typical data only services, or 3 symbols for