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How UE gets the value of BI in lte?

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How ever ENB will send either BI or RAPID in RAR, then if ENB sends only RAPID then how ue gets BI to apply for rach failure ?

posted Mar 15, 2018 by Himani

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1 Answer

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Backoff Indicator' is a special form of MAC header/subheader. Its made up of 4 bits & it can carry the value from 0~15.
As per 36.321, Backoff Parameter values are presented in Table 7.2-1.
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answer Mar 15, 2018 by Mohit Mohan
Hi, thank you. But my question was if ENB sends only rapid then how UE will get to know these BI vales?
I think,ENB can choose a random BI value in this case .
like- If PRACH resources are more in reserved ,then BI time can be less.
BI is applied y UE, If ENB selects random then how UE will get to know this ?
enb will send BI in RAR ,then ue will assigns corresponding value according to table given above
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