name: ORACH
full_form: ODMA Random Access Channel
context: The minimum idle time to detect a complete FCCH burst for all possible alignments between the GSM and the 1.28Mcps TDD frame structure (called âguaranteed FCCH detectionâ), assuming that monitoring happens every sub-frame, can be calculated as follows (tFCCH = one GSM slot): - (e.g for tsynth =0ms: 2 1.28Mcps TDD consecutive idle timeslots needed, for tsynth =0.3ms: 3 slots (or 2 slots and the DwPTS+GP+UpPTS), for tsynth =0.5ms: 3 slots, for tsynth =0.8ms: 4 slots). Under this conditions the FCCH detection time can never exceed the time of 660ms. - (For a more general consideration tsynth may be considered as a sum of all delays before starting monitoring is possible). - For detecting SCH instead of FCCH (for a parallel search) the same equation applies. - In the equation before the dual synthesiser UE is included if the synthesiser switching time is 0ms. Table G.1.1: FCCH detection time for a single synthesizer UE monitoring GSM from 1.28Mcps TDD every sub-frame The result in the
description: The ODMA Random Access Channel (ORACH) is a specific channel used for probing activities in the context of ODMA Relay Probing. It is utilized by the User Equipment (UE) to probe the network at defined rates, which are determined by the probing activity parameter K. The ORACH can be used in different modes, including Full Probing, Duty Maintained Probing, and Relay Prohibited, each with distinct characteristics for probing activities within a multiframe.
explanation: The context clearly states that ORACH is a channel dedicated to probing activities within the ODMA system. Its role in facilitating network probing by User Equipment (UE) and its operation across different modes further solidify its classification as a Channel.
section_title: 4.9.3	ODMA Relay Probing
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