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

[Yves Godin]

Bhargava,

This answer only applies to platforms that use the NuRAN PHY (SuperFemto, LiteCell 1.x, ...).

 

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

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

[YGOD] Yes it will.

 

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

[YGOD] Data is packed LSB first

 

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

[YGOD] Yes, you are correct. GsmL1_BurstType_Access_0 is for the "normal" access bursts, GsmL1_BurstType_Access_1 is for TS1 and GsmL1_BurstType_Access_2 is for TS2.

 

Best Regards,

Yves

 

 

De : osmocom-net-gprs [mailto:osmocom-net-gprs-bounces at lists.osmocom.org] De la part de Bhargava Abhyankar
Envoyé : March-22-16 10:53 AM
À : osmocom-net-gprs at lists.osmocom.org
Objet : Queries regarding L1 interface to osmo-bts for 11 bit RACH

 

Hello,

                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

 

Regards

Bhargava Abhyankar

 

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