Method for adjusting RACH transmission against frequency offset
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United States of America Patent
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Oct 23, 2012
Grant Date -
Mar 4, 2010
app pub date -
Oct 25, 2007
filing date -
Oct 25, 2006
priority date (Note) -
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status (Latency Note)
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Abstract
A method for establishing RACH transmission to prepare against the frequency offset is disclosed. The method reduces the length of the RACH preamble even if the frequency offset exists, allows the RACH preamble to include a repeated structure (also called an iterative structure) or to use a specific sequence with less affect on the frequency offset, so that the Node-B can easily detect the RACH preamble. If different conditions are established in a high-speed UE and a low-speed UE, an amount of system overheads can be reduced as compared to another case in which an overall RACH condition has been prescribed for only the high-speed UE irrespective of the low-speed UE. And, the method determines whether the user equipment (UE) can estimate its speed according to the aforementioned RACH setup condition, and prescribes a detailed RACH access method according to the determined result.
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