name: RNR
full_form: Receive Not Ready (frame type)
context: There are three modulation proposals for the coaxial interface option defined in the RET TR25.802. To help to make the decision between them, some points are highlighted below w.r.t. OOK (On-Off Keying) and D-QPSK (Differential Quadrature Phase Shift Keying) modulations. Signal spectrum OOK as a modulation method requires wider signal bandwidth in comparison to the used signal rate than D-QPSK modulation. Also the spurious signals generated in the OOK modulation process will spread to the wider band and to remove them on the receiver side, the signal has to be filtered. Therefore filtering the spurious signals needs more consideration with OOK. Bit rate For the software downloads, it is preferred to have a possibility to increase the bit rate temporarily. The proposed D-QPSK can support 115kbps (and even beyond) while the OOK modulation can only support some tens of kbps at maximum. Because of the future proofness, the chosen modulation method should have capability for higher bit
description: Receive Not Ready (RNR) is a type of frame used in the control field to inform the secondary station that it is allowed to transmit response frames. It prevents transmission of I frames and constitutes a poll when the P/F bit is set.
explanation: The context from 3GPP TS 37.462 describes RNR as a specific frame type with distinct functionality in controlling data transmission between stations, which led to its classification under Frame Type.
section_title: A.7	Full duplex link
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