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What is the meaning of "Spare1" in 3GPP standard ?

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I have read 3GPP standards and I found many parameter determination with "spare1" or "spare2", etc.
I want to ask what is its's meaning in this part.

Illustration of an example in 3GPP standard

posted Sep 12 by Lin Unis
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3GPP = Third Generation Partnership Project

LTE= Long Term Evolution

UMB = Ultra Mobile Broaband

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