wolverine
2010-11-29, 07:58 PM
Hello all,
Observe the attached graphic that shows the familiar procedure for PRACH power control. Preambles of increasing power are sent by the UE until an ACK is received. Then the PRACH message itself can be sent.
Logic would dictate that the PRACH message would be sent with the same amount of power the last preamble used i.e the parameter powerOffsetPpm would be set to 0dB or even higher.
In E*******'s recommended setting however for powerOffsetPpm is actually -4dB which to me doesn't make sense. Can anyone explain the logic behind this or share the value they use in their network.
For reference Alcatel Lucent recommend a setting of 0dB.
Observe the attached graphic that shows the familiar procedure for PRACH power control. Preambles of increasing power are sent by the UE until an ACK is received. Then the PRACH message itself can be sent.
Logic would dictate that the PRACH message would be sent with the same amount of power the last preamble used i.e the parameter powerOffsetPpm would be set to 0dB or even higher.
In E*******'s recommended setting however for powerOffsetPpm is actually -4dB which to me doesn't make sense. Can anyone explain the logic behind this or share the value they use in their network.
For reference Alcatel Lucent recommend a setting of 0dB.