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When E-NodeB ask to trigger for UE Power Headroom Report (PHR)?

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How can I figure out real power value from this report value ?

posted Apr 2, 2014 by Hiteshwar Thakur

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1 Answer

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PHR is a MAC control element that the UE uses to tell the eNB, how much power it has been left with currently. Pmax - P_pusch . (Pmax is sent in SIB2)

RRC conn setup or RRC reconfig provides a MAC IE called phr-config which contains params that define the triggers for the UE to send PHR.

-periodicPHR-Timer
An interval for which the UE sends the PHR regularly.
-prohibitPHR-Timer
A throttle timer which the UE should maintain between sending 2 consecutive PHRs. This value will be chosen to consider the round-trip delay
-dl-PathlossChange
This is a threshold value which the DL-Pathloss (UE calculates this as a diff bw Signalled RS transmit power and the RSRP seen by the UE), cannot exceed. The moment this occurs, a PHR is sent.

In the PHR MAC CE, there are 6 bits that hold the PH value ranging from 0-63(PH0 means <=-22db and >=-23db, PH1 means -22to-21 and so on PH63 means >=40db)

answer Apr 2, 2014 by Chandra Javalkar
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