System Planning 82
may be easier to upgrade to Channel bonding (CB2) in the future and still experience the channel
isolation.
Note
It is important to use the same polarity at the same site. For more details about the polarity,
refer to the Polarity section.
Polarity
60 GHz CnWave uses TDD, which is synchronized across the network. As one sector is in the transmit
phase, the neighbor sector is in the receive phase. The transmit and receive phases of the sectors are
determined by the EVEN or ODD polarity.
All sectors with a common polarity in a network could be transmitting or receiving at the same time.
Hybrid polarity is when a node uses an EVEN polarity on one sector and an ODD on another sector.
Although the hybrid polarity is possible through configuration, you must avoid this unless the installer is
sure that the two links on the sectors are orthogonal. Figure 58 shows an example of the hybrid polarity.
Figure 58:
Hybrid polarity
Link Adaptation and Transmit Power Control (LATPC)
The modulation and code scheme (MCS) rate and transmit power are both adaptive values. These values
are set at the transmitter, independently, for every link and for both directions. The adaptive MCS
selection procedure is referred to as link adaptation (LA) and the transmit power procedure as transmit
power control (TPC).
There are two versions of this adaptation, data traffic, and standby, as described:
l When there is data traffic, adaptation is driven by block error rate (BLER) reported every SF
(1.6ms). A lower BLER causes the algorithm to adapt the transmit power or MCS.
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