User's Manual

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Base Station Menu
BreezeMAX Modular Base Station System Manual 105
The default is TDD.
In the current release only TDD mode is supported, and the Duplex Mode should
not be changed.
A change in the configured Duplex Mode is applied only after reset.
4.5.2.6.2 DL-UL Ratio
Applicable only when the Duplex Mode is set to TDD. Defines the ratio of transmit
(Down Link) time to receive (Up Link) time, in percents.
The available values are:
1: 65-35
2: 60-40
3: 55-45
4: 50-50
5: 45-55
6: 40-60
7: 35-65
When Sub-channelization is enabled (Minimum Number of Sub-Channels is other
than 16), some DL-UL Ratios are not supported for certain combinations of
Bandwidth, AU Minimum Allocation and Maximum Cell Radius:
For 3.5 MHz bandwidth and AU Minimum Allocation of 5 Symbols, UL-DL
Ratios of 65-35 and 60-40 are not supported, regardless of Maximum Cell
Radius. UL-DL Ratio of 55-45 is not supported for Maximum Cell Radius of 30
km or higher.
For 3.5 MHz bandwidth and VAU Minimum Allocation of 3 Symbols, UL-DL
Ratio of 65-35 is not supported, regardless of Maximum Cell Radius. UL-DL
Ratio of 60-40 is not supported for Maximum Cell Radius of 20 km or higher.
UL-DL Ratio of 55-45 is not supported for Maximum Cell Radius of 50 km.
NOTE
In systems that support only a single mode of operation, any attempt to change the Duplex Mode to
a mode that is not supported will be rejected. If there is a mismatch between the configured value
and the mode supported by the AUs, a suitable error message and trap will be sent and the system
will not become operational until proper configuration is completed.