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Abis Interface » History » Version 1

laforge, 02/19/2016 10:47 PM

1 1 laforge
The Abis protocol is the protocol spoken between the BSC (Base Station Controller) and BTS (Base Transceiver Station).
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It is specified in the following GSM standards:
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 * 3GPP TS 08.51 : BSC-BTS Interface General Aspects
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 * 3GPP TS 08.52 : BSC-BTS Interface principles
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 * 3GPP TS 08.54 : BSC-BTS Layer 1: Structure of Physical Circuits
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 * 3GPP TS 08.56 : BSC-BTS Layer 2: Specification
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 * 3GPP TS 08.58 : BSC-BTS Layer 3: Specification
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  * This contains the specification of the RSL (Radio Signalling Link) on SAPI 0
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 * 3GPP TS 21.21 : Network Management procedures and messages on the A-bis interface
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  * This basically describes the OML (Organization and Maintenance Layer) on SAPI 62
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== RSL (Radio Signalling Link) ==
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The RSL contains two types of messages
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 * transparent messages (forwarded by BTS without interpretation or changes)
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 * non-transparent messages (messages sent between BSC and BTS)
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furthermore, the messages are grouped into four main groups (see below).
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All messages are transmitted using LAPD I frames, except for MEASUREMENT RESULT (UI).
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=== Radio Link Layer Management ===
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 * EST_IND: Link establishment indication (BTS->BSC)
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 * EST_REQ: Link establishment request (BSC->BTS)
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 * EST_CONF: Link establishment Confirmation (BTS->BSC)
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 * REL_IND: Link release indication (BTS->BSC)
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 * REL_REQ: Link release request (BSC->BTS)
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 * REL_CONF: Link release confirmation (BTS->BSC)
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 * DATA_REQ: Transmission of transparent L3 message in acknowledged mode (BSC->BTS)
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 * DATA_IND: Reception of transparent L3 message in acknowledged mode (BTS->BSC)
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 * UNIT_DATA_REQ: Transmission of transparent L3 message in unacknowledged mode (BSC->BTS)
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 * UNIT_DATA_IND: Reception of transparent L3 message in unacknowledged mode (BTS->BSC)
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 * ERROR_IND: Link error indication (BTS->BSC)
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=== Dedicated Channel Management ===
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 * CHAN_ACTIV: Channel activation (BSC->BTS)
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 * CHAN_ACTIV_ACK: Channel activation acknowledgement (BTS->BSC)
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 * CHAN_ACTIV_NACK: Channel activation not acknowledged (BTS->BSC)
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 * MODE_MODIFY: Channel mode modify (BSC->BTS)
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 * MODE_MODIFY_ACK: Channel mode modify acknowledgement (BTS->BSC)
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 * MODE_MODIFY_NACK: Channel mode modify not acknowledged (BTS->BSC)
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 * HANDO_DET: Handover detection (BTS->BSC)
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 * ENCR_CMD: Start of Encryption (BSC->BTS)
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 * MEAS_RES: Measurement result (BTS->BSC)
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 * PREPROC_CONFIGURE: Configure pre-processed measurement report (BSC->BTS)
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 * PREPROC_MEAS_RES: Preprocessed measurement report (BTS->BSC)
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 * DEACT_SACCH: Deactivate SACCH (BSC->BTS)
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 * RF_CHAN_REL: Radio channel release (BSC->BTS)
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 * RF_CHAN_REL_ACK: Radio channel release ack (BTS->BSC)
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 * MS_POWER_CONTROL: MS power control (BSC->BTS)
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 * BS_POWER_CONTROL: Transmission power control (BSC->BTS)
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 * CONN_FAIL_IND: Connection failure indication (BTS->BSC)
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 * PHYS_CONTEXT_REQ: Physical context request (BSC->BTS)
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 * PHYS_CONTEXT_CONF: Physical context confirmation (BTS->BSC)
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 * SACCH_INFO_MODIFY: SACCH nformation modify (BSC->BTS)
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 * TALKER_DET: Talker detection (BTS->BSC)
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 * LISTENER_DET: Listener detection (BTS->BSC)
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 * REMOTE_CODEC_CONF: Remote codec configuration (BTS->BSC)
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 * RTD_REP: Round Trip Delay Report (BTS->BSC)
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 * PRE_HANDO_NOTIF: Pre-handover warning (BSC->BTS)
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 * CODEC_MOD_REQ: Multirate codec configuration change request (BSC->BTS)
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 * CODEC_MOD_ACK: Multirate codec configuration change acknowledge (BTS->BSC)
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 * CODEC_MOD_PERF: Multirate codec change performed (BTS->BSC)
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 * TFO_REPORT: TFO Report / AMR (BTS->BSC)
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 * TFO_MODIFICATION_REQ: TFO Modification Request (BSC->BTS)
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=== Common Channel Management ===
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 * CHAN_RQS: Channel request by MS (BTS->BSC)
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 * PAG_CMD: Paging command (BSC->BTS)
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 * DELETE_IND: Delete indication (BTS->BSC)
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 * CCCH_LOAD_IND: CCCH load indication (BTS->BSC)
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 * BCCH_INFO: Broadcast information modify (BSC->BTS)
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 * SMS_BROADCAST_REQ: Short Message Cell Broadcast (BSC->BTS)
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 * SMS_BROADCAST_CMD: Short Message Cell Broadcast (BSC->BTS)
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 * IMM_ASS_CMD: Immediate Assign command (BSC->BTS)
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 * NOTIF_CMD: Notification (BSC->BTS)
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=== TRX Management ===
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 * RF_RES_IND: Radio resource indication (BTS->BSC)
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 * SACCH_FILL: SACCH filling information modify (BSC->BTS)
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 * OVERLOAD: Flow control (BTS->BSC)
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 * ERROR_REPORT: Error reporting (BTS->BSC)
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