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). |
---|---|---|---|
2 | |||
3 | It is specified in the following GSM standards: |
||
4 | * 3GPP TS 08.51 : BSC-BTS Interface General Aspects |
||
5 | * 3GPP TS 08.52 : BSC-BTS Interface principles |
||
6 | * 3GPP TS 08.54 : BSC-BTS Layer 1: Structure of Physical Circuits |
||
7 | * 3GPP TS 08.56 : BSC-BTS Layer 2: Specification |
||
8 | * 3GPP TS 08.58 : BSC-BTS Layer 3: Specification |
||
9 | * This contains the specification of the RSL (Radio Signalling Link) on SAPI 0 |
||
10 | * 3GPP TS 21.21 : Network Management procedures and messages on the A-bis interface |
||
11 | * This basically describes the OML (Organization and Maintenance Layer) on SAPI 62 |
||
12 | |||
13 | |||
14 | == RSL (Radio Signalling Link) == |
||
15 | |||
16 | The RSL contains two types of messages |
||
17 | * transparent messages (forwarded by BTS without interpretation or changes) |
||
18 | * non-transparent messages (messages sent between BSC and BTS) |
||
19 | |||
20 | furthermore, the messages are grouped into four main groups (see below). |
||
21 | |||
22 | All messages are transmitted using LAPD I frames, except for MEASUREMENT RESULT (UI). |
||
23 | |||
24 | === Radio Link Layer Management === |
||
25 | * EST_IND: Link establishment indication (BTS->BSC) |
||
26 | * EST_REQ: Link establishment request (BSC->BTS) |
||
27 | * EST_CONF: Link establishment Confirmation (BTS->BSC) |
||
28 | * REL_IND: Link release indication (BTS->BSC) |
||
29 | * REL_REQ: Link release request (BSC->BTS) |
||
30 | * REL_CONF: Link release confirmation (BTS->BSC) |
||
31 | * DATA_REQ: Transmission of transparent L3 message in acknowledged mode (BSC->BTS) |
||
32 | * DATA_IND: Reception of transparent L3 message in acknowledged mode (BTS->BSC) |
||
33 | * UNIT_DATA_REQ: Transmission of transparent L3 message in unacknowledged mode (BSC->BTS) |
||
34 | * UNIT_DATA_IND: Reception of transparent L3 message in unacknowledged mode (BTS->BSC) |
||
35 | * ERROR_IND: Link error indication (BTS->BSC) |
||
36 | |||
37 | === Dedicated Channel Management === |
||
38 | * CHAN_ACTIV: Channel activation (BSC->BTS) |
||
39 | * CHAN_ACTIV_ACK: Channel activation acknowledgement (BTS->BSC) |
||
40 | * CHAN_ACTIV_NACK: Channel activation not acknowledged (BTS->BSC) |
||
41 | * MODE_MODIFY: Channel mode modify (BSC->BTS) |
||
42 | * MODE_MODIFY_ACK: Channel mode modify acknowledgement (BTS->BSC) |
||
43 | * MODE_MODIFY_NACK: Channel mode modify not acknowledged (BTS->BSC) |
||
44 | * HANDO_DET: Handover detection (BTS->BSC) |
||
45 | * ENCR_CMD: Start of Encryption (BSC->BTS) |
||
46 | * MEAS_RES: Measurement result (BTS->BSC) |
||
47 | * PREPROC_CONFIGURE: Configure pre-processed measurement report (BSC->BTS) |
||
48 | * PREPROC_MEAS_RES: Preprocessed measurement report (BTS->BSC) |
||
49 | * DEACT_SACCH: Deactivate SACCH (BSC->BTS) |
||
50 | * RF_CHAN_REL: Radio channel release (BSC->BTS) |
||
51 | * RF_CHAN_REL_ACK: Radio channel release ack (BTS->BSC) |
||
52 | * MS_POWER_CONTROL: MS power control (BSC->BTS) |
||
53 | * BS_POWER_CONTROL: Transmission power control (BSC->BTS) |
||
54 | * CONN_FAIL_IND: Connection failure indication (BTS->BSC) |
||
55 | * PHYS_CONTEXT_REQ: Physical context request (BSC->BTS) |
||
56 | * PHYS_CONTEXT_CONF: Physical context confirmation (BTS->BSC) |
||
57 | * SACCH_INFO_MODIFY: SACCH nformation modify (BSC->BTS) |
||
58 | * TALKER_DET: Talker detection (BTS->BSC) |
||
59 | * LISTENER_DET: Listener detection (BTS->BSC) |
||
60 | * REMOTE_CODEC_CONF: Remote codec configuration (BTS->BSC) |
||
61 | * RTD_REP: Round Trip Delay Report (BTS->BSC) |
||
62 | * PRE_HANDO_NOTIF: Pre-handover warning (BSC->BTS) |
||
63 | * CODEC_MOD_REQ: Multirate codec configuration change request (BSC->BTS) |
||
64 | * CODEC_MOD_ACK: Multirate codec configuration change acknowledge (BTS->BSC) |
||
65 | * CODEC_MOD_PERF: Multirate codec change performed (BTS->BSC) |
||
66 | * TFO_REPORT: TFO Report / AMR (BTS->BSC) |
||
67 | * TFO_MODIFICATION_REQ: TFO Modification Request (BSC->BTS) |
||
68 | |||
69 | === Common Channel Management === |
||
70 | * CHAN_RQS: Channel request by MS (BTS->BSC) |
||
71 | * PAG_CMD: Paging command (BSC->BTS) |
||
72 | * DELETE_IND: Delete indication (BTS->BSC) |
||
73 | * CCCH_LOAD_IND: CCCH load indication (BTS->BSC) |
||
74 | * BCCH_INFO: Broadcast information modify (BSC->BTS) |
||
75 | * SMS_BROADCAST_REQ: Short Message Cell Broadcast (BSC->BTS) |
||
76 | * SMS_BROADCAST_CMD: Short Message Cell Broadcast (BSC->BTS) |
||
77 | * IMM_ASS_CMD: Immediate Assign command (BSC->BTS) |
||
78 | * NOTIF_CMD: Notification (BSC->BTS) |
||
79 | |||
80 | === TRX Management === |
||
81 | * RF_RES_IND: Radio resource indication (BTS->BSC) |
||
82 | * SACCH_FILL: SACCH filling information modify (BSC->BTS) |
||
83 | * OVERLOAD: Flow control (BTS->BSC) |
||
84 | * ERROR_REPORT: Error reporting (BTS->BSC) |