Queries regarding L1 interface to osmo-bts for 11 bit RACH

Bhargava Abhyankar Bhargava.Abhyankar at radisys.com
Tue Mar 22 14:53:19 UTC 2016

                We have planned to support 11 bit RACH in osmo-pcu and osmo-bts. In this regard, we have  a query related to layer 1 to osmo-bts interface, as described below.

1.       For 11 bit RACH,  in PH-RA-IND sent from layer 1.

*         Whether 'u8Size' will be 2 in case of 11 bit RACH ?

*         What is the alignment of 11 bits inside 'u8Buffer ?

2.       How osmo-bts can distinguish between types of 11 bit RACH based on received layer 1 message ? (spec 44.060 section 11.2.5a)

*         is burst type GsmL1_BurstType_Access_0 equivalent to GPRS_8_BIT_RACH/ GPRS_11_BIT_RACH

*         is burst type GsmL1_BurstType_Access_1 equivalent to EGPRS_8_PSK_11_BIT_RACH

*         is burst type GsmL1_BurstType_Access_2 equivalent to EGPRS_NO_8_PSK_11_BIT_RACH

Bhargava Abhyankar

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