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Reply To: RACH Min.Access Level & RXLEV_ACCESS_MIN

#62562
Bijoy
Guest

Hi Agha

Rach Busy Thresold:

For the BTS3X series and double-transceiver BTSs, this parameter specifies the level threshold for the MS random access when the BTS determines the RACH busy state. When the receive level of the random access burst timeslot is greater than this threshold, the BTS considers that the timeslot is busy. For the BTS3X series and the double-transceiver BTSs, this parameter only indicates whether the timeslot is busy. The threshold setting does not affect the normal access of the MS.

For the BTS2X series (excluding the BTS24), this parameter specifies the level threshold for the BTS to determine an MS random access.When the receive level of the random access burst timeslot is greater than this threshold and the access demodulation is successful, the BTS considers that the timeslot is busy and determines whether the RACH access is valid based on the parameter Random Access Error Threshold. For the BTS2X, the parameter RACH Busy Threshold is used to determine whether the timeslot is busy. In addition, the parameter affects the normal access of the MS. The MS access is allowed only when the level of the MS random access burst is greater than the RACH Busy Threshold.

For the BTS24, this parameter has two functions. One function is indicating the level threshold of the MS random access for the system to determine the RACH busy state. When the receive level of the random access burst timeslot is greater than this threshold, the BTS considers that the timeslot is busy. The other function is indicating whether the MS access is allowed.The MS access is allowed only when access level (including random access and handover access) is greater than the threshold.

RACH Min.Access Level:
For the BTS3X, this parameter specifies the level threshold for the random access of the MS. If the receive level of the RACH burst is smaller than the value of RACH Min.Access Level, the BTS regards this access as an invalid one and no decoding is performed. If the receive level of the RACH burst is greater than the value of RACH Min. Access Level, the BTS considers that an access request exists on this timeslot, and determines together with the value of Random Access Error Threshold whether the RACH access is valid.

Generally, RACH Busy Threshold is higher than RACH Min.Access Level. Therefore, for the BTS24, RACH Min.Access Level is shielded. For the BTS2X (excluding the BTS24), the RACH Min.Access Level parameter is invalid.

So ,RBT is the only available parameter in BTX2X series which serves the purpose of RALM too,while in BTS3X,we have both RBT and RALM.