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RUGGEDCOM WIN
User Guide
Section 1.3
Time Division Duplexing (TDD)
The SS uses time division duplexing (TDD) to transmit and receive on the same RF channel. This is a non-
contention based method for providing an efficient and predictable two-way PTP or PMP cell deployment. All
uplink and downlink transmission scheduling is managed by the base station. The base station sends data traffic
to subscribers, polls for grant requests, and sends grant acknowledgements based on the total of all traffic to all
subscribers.
Section 1.4
Coding Rates
Each burst of data transmitted over the wireless interface is padded with redundant information, making it more
resistant to potential over-the-air errors. The coding rate is the ratio of user data to the total data transmitted
including the redundant error correction data. The base station supports coding rates of 1/2, 2/3, and 3/4.
Section 1.5
Modulation
The modulation technique specifies how the data is coded within the OFDMA carriers. The base station supports
QPSK, 16 Quadarature Amplitude Modulation (QAM), and 64 QAM modulations.
Section 1.6
Convolution Turbo Coding Correction
Convolution Coding (CC) error correction is enabled for all traffic rates. This low-level process can correct bursts of
errors in received messages and reduce the number of retransmissions.
Section 1.7
Deployment Models
The SS supports point to point (PTP) and point to multipoint (PMP) deployment scenarios.
CONTENTS
•
Section 1.7.1, "PTP Deployment"
•
Section 1.7.2, "PMP Deployment"
•
Section 1.7.3, "Non Line-of-Sight"
Time Division Duplexing (TDD)
Chapter 1
Introduction
5
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