2016-03-04 17:16:58 +00:00
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[[bssgp]]
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2016-02-29 14:09:55 +00:00
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== BSS GPRS Protocol (BSSGP)
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=== List of Messages
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The following tables list the BSSGP messages used by OsmoPCU, grouped by their
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level of compliance with 3GPP TS 08.18.
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==== Messages Compliant With TS 08.18
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.Messages compliant with TS 08.18
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[options="header",cols="10%,10%,20%,35%,5%,20%"]
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|===
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| TS 08.18 § | type code (hex) | This document § | Message | <-/-> | Received/Sent by OsmoPCU
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2016-03-04 17:16:58 +00:00
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6+<| *RL and BSSGP SAP Messages:*
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| 10.2.1 | 0x00 | <<dl_unit_data>> | DL-UNITDATA | <- | Received
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| 10.2.2 | 0x01 | <<ul_unit_data>> | UL-UNITDATA | -> | Sent
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| 10.2.3 | 0x02 | <<ra_capab>> | RA-CAPABILITY | <- | Received
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6+<| *GMM SAP Messages:*
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| 10.3.1 | 0x06 | <<paging_ps>> | PAGING PS | <- | Received
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| 10.3.2 | 0x07 | <<paging_cs>> | PAGING CS | <- | Received
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| 10.3.7 | 0x0c | <<susp_ack>> | SUSPEND-ACK | <- | Received
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| 10.3.8 | 0x0d | <<susp_nack>> | SUSPEND-NACK | <- | Received
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| 10.3.10 | 0x0f | <<res_ack>> | RESUME-ACK | <- | Received
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| 10.3.11 | 0x10 | <<res_nack>> | RESUME-NACK | <- | Received
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6+<| *NM SAP Messages:*
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| 10.4.9 | 0x21 | <<block_ack>> | BVC-BLOCK-ACK | <- | Received
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| 10.4.12 | 0x22 | <<bvc_reset>> | BVC-RESET | <-/-> | Received/Sent
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| 10.4.13 | 0x23 | <<reset_ack>> | BVC-RESET-ACK | <- | Received
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| 10.4.10 | 0x24 | <<bvc_unblock>> | BVC-UNBLOCK | -> | Sent
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| 10.4.11 | 0x25 | <<unblock_ack>> | BVC-UNBLOCK-ACK | <- | Received
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| 10.4.4 | 0x26 | <<flow_bvc>> | FLOW-CONTROL-BVC | -> | Sent
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| 10.4.5 | 0x27 | <<flow_bvc_ack>> | FLOW-CONTROL-BVC-ACK | <- | Received
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| 10.4.7 | 0x29 | <<flow_ms_ack>> | FLOW-CONTROL-MS-ACK | <- | Received
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| 10.4.1 | 0x2a | <<flush_ll>> | FLUSH-LL | <- | Received
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| 10.4.15 | 0x40 | <<invoke_trace>> | SGSN-INVOKE-TRACE | <- | Received
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| 10.4.14 | 0x41 | <<bssgp_status>> | STATUS | <-/-> | Received/Sent
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2016-02-29 14:09:55 +00:00
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|===
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==== Messages Specific to OsmoPCU
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There are no OsmoPCU specific BSSGP messages.
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2016-03-04 17:16:58 +00:00
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[[not_impl]]
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2016-02-29 14:09:55 +00:00
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==== Messages Not Implemented by OsmoPCU
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.3GPP TS 08.18 messages not implemented by OsmoPCU
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[options="header",cols="10%,10%,80%"]
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|===
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| TS 08.18 § | type code (hex) | Message
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2016-03-04 17:16:58 +00:00
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3+<| *RL (relay) and BSSGP SAP Messages:*
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| 10.2.4 | 0x03 | PTM-UNITDATA
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3+<| *GMM (GPRS mobility management) SAP Messages:*
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| 10.3.3 | 0x08 | RA-CAPABILITY-UPDATE
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| 10.3.4 | 0x09 | RA-CAPABILITY-UPDATE-ACK
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| 10.3.5 | 0x0a | RADIO-STATUS
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| 10.3.6 | 0x0b | SUSPEND
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| 10.3.9 | 0x0e | RESUME
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3+<| *NM (network management) SAP Messages:*
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| 10.4.8 | 0x20 | BVC-BLOCK
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| 10.4.6 | 0x28 | FLOW-CONTROL-MS
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| 10.4.2 | 0x2b | FLUSH-LL-ACK
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| 10.4.3 | 0x2c | LLC-DISCARDED
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3+<| *PFM (packet flow management) SAP Messages:*
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| 10.4.16 | 0x50 | DOWNLOAD-BSS-PFC
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| 10.4.17 | 0x51 | CREATE-BSS-PFC
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| 10.4.18 | 0x52 | CREATE-BSS-PFC-ACK
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| 10.4.19 | 0x53 | CREATE-BSS-PFC-NACK
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| 10.4.20 | 0x54 | MODIFY-BSS-PFC
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| 10.4.21 | 0x55 | MODIFY-BSS-PFC-ACK
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| 10.4.22 | 0x56 | DELETE-BSS-PFC
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| 10.4.23 | 0x57 | DELETE-BSS-PFC-ACK
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2016-02-29 14:09:55 +00:00
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|===
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=== Details on Compliant BSSGP Messages
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2016-03-04 17:16:58 +00:00
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[[dl_unit_data]]
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==== DL-UNITDATA
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This message conforms to 3GPP TS 08.18 § 10.2.1, with the following limitations: OsmoPCU does not support QoS,
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all optional IEs except for IMSI and old TLLI are ignored.
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._DL-UNITDATA_ IE limitations
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[options="header",cols="10%,30%,60%"]
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|===
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| TS 08.18 § | IE Name | Handling
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| 11.3.28 | QoS Profile | _ignored_
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| 11.3.22 | MS Radio Access Capability | _ignored_
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| 11.3.27 | Priority | _ignored_
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| 11.3.11 | DRX Parameters | _ignored_
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| 1.3.42 | PFI | _ignored_
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| 11.3.19 | LSA Information | _ignored_
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| 11.3.47 | Service UTRAN CCO | _ignored_
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|===
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[[ul_unit_data]]
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==== UL-UNITDATA
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This message conforms to 3GPP TS 08.18 § 10.2.2, with the following limitations:
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OsmoPCU does not send optional IEs - PFI (§ 12.3.42) and LSA Identifier List (§ 11.3.18).
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QoS Profile (§ 11.3.28) IE is always set to 0x04.
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[[ra_capab]]
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==== RA-CAPABILITY
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This message is received and logged but ignored by OsmoPCU at the moment.
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[[paging_ps]]
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==== PAGING PS
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This message conforms to 3GPP TS 08.18 § 10.3.1, with the following limitations:
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only IMSI and P-TMSI are parsed by OsmoPCU.
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._DL-UNITDATA_ IE limitations
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[options="header",cols="10%,30%,60%"]
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|===
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| TS 08.18 § | IE Name | Handling
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| 11.3.11 | DRX Parameters | _ignored_
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| 11.3.6 | BVCI | _ignored_
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| 11.3.17 | Location Are | _ignored_
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| 11.3.31 | Routeing Area | _ignored_
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| 11.3.3 | BSS Area Indication | _ignored_
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| 1.3.42 | PFI | _ignored_
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| 11.3.43 | ABQP | _ignored_
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| 11.3.28 | QoS Profile | _ignored_
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| 11.3.36 | P-TMSI | treated as mandatory (in case of absence paging with 0-length P-TMSI will be sent)
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|===
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[[paging_cs]]
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==== PAGING CS
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This message is received and logged but ignored by OsmoPCU at the moment.
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[[susp_ack]]
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==== SUSPEND-ACK
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This message is received and logged but ignored by OsmoPCU at the moment.
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[[susp_nack]]
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==== SUSPEND-NACK
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This message is received and logged but ignored by OsmoPCU at the moment.
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[[res_ack]]
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==== RESUME-ACK
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This message is received and logged but ignored by OsmoPCU at the moment.
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[[res_nack]]
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==== RESUME-NACK
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This message is received and logged but ignored by OsmoPCU at the moment.
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[[block_ack]]
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==== BVC-BLOCK-ACK
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This message is received and logged but ignored by OsmoPCU at the moment.
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[[bvc_reset]]
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==== BVC-RESET
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OsmoPCU never transmits optional Feature bitmap (3GPP TS 08.18 § 11.3.40) IE.
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Receiving BVC RESET will cause OsmoPCU to respond with "Unknown BVCI" status message.
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[[reset_ack]]
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==== BVC-RESET-ACK
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This message conforms to 3GPP TS 08.18 § 10.4.13.
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After receiving it OsmoPCU completes the RESET procedure for BVC according to 3GPP TS 08.18 § 8.4.
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[[unblock_ack]]
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==== BVC-UNBLOCK-ACK
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This message conforms to 3GPP TS 08.18 § 10.4.11.
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After receiving it OsmoPCU completes the RESET procedure for BVC according to 3GPP TS 08.18 § 8.3.
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[[bvc_unblock]]
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==== BVC-UNBLOCK
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This message conforms to 3GPP TS 08.18 § 10.4.10 and is send by OsmoPCU as part of UNBLOCK procedure
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described in 3GPP TS 08.18 § 8.3.
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[[flow_ms_ack]]
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==== FLOW-CONTROL-MS-ACK
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This message is received and logged but ignored by OsmoPCU at the moment.
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[[flow_bvc_ack]]
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==== FLOW-CONTROL-BVC-ACK
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This message is received and logged but ignored by OsmoPCU at the moment.
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[[flow_bvc]]
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==== FLOW-CONTROL-BVC
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This message conforms to 3GPP TS 08.18 § 10.4.4, with the following limitations:
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OsmoPCU does not support Current Bucket Level (CBL) feature so Bucket_Full Ratio (TS 08.18 § 11.3.46) IE
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is not transmitted as part of this message.
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[[flush_ll]]
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==== FLUSH-LL
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This message is received and logged but ignored by OsmoPCU at the moment.
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[[invoke_trace]]
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==== SGSN-INVOKE-TRACE
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This message is received and logged but ignored by OsmoPCU at the moment.
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[[bssgp_status]]
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==== STATUS
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This message conforms to 3GPP TS 08.18 § 10.4.14.
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2016-02-29 14:09:55 +00:00
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=== Information Elements Overview
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All of the IEs handled by OsmoPCU are listed below, with limitations and
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additions to TS 08.18 specified in more detail.
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==== IEs Conforming to TS 08.18
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The following Information Elements are accepted by OsmoPCU. Not all IEs are
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actually evaluated.
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.IEs conforming to TS 08.18
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[options="header",cols="5%,10%,40%,5%,40%"]
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|===
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| tag (hex) | TS 08.18 § | IE name | <-/-> | Received/Sent by OsmoPCU
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2016-03-04 17:16:58 +00:00
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| 0x00 | 11.3.1 | Alignment Octets | <-/-> | Received/Sent
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| 0x01 | 11.3.2 | Bmax default MS | -> | Sent
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| 0x02 | 11.3.3 | BSS Area Indication | <- | Received
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| 0x03 | 11.3.4 | Bucket Leak Rate | -> | Sent
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| 0x04 | 11.3.6 | BVCI | <-/-> | Received/Sent
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| 0x05 | 11.3.5 | BVC Bucket Size | -> | Sent
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| 0x06 | 11.3.7 | BVC Measurement | -> | Sent
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| 0x07 | 11.3.8 | Cause | <-/-> | Received/Sent
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| 0x08 | 11.3.9 | Cell Identifier | -> | Sent
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| 0x09 | 11.3.10 | Channel needed | <- | Received
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| 0x0a | 11.3.11 | DRX Parameters | <- | Received
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| 0x0b | 11.3.12 | eMLPP-Priority | <- | Received
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| 0x0c | 11.3.13 | Flush Action | <- | Received
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| 0x0d | 11.3.14 | IMSI | <-/-> | Received/Sent
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| 0x0e | 11.3.15 | LLC-PDU | <-/-> | Received/Sent
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| 0x0f | 11.3.16 | LLC Frames Discarded | -> | Sent
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| 0x10 | 11.3.17 | Location Area | <- | Received
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| 0x11 | 11.3.20 | Mobile Id | <- | Received
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| 0x12 | 11.3.21 | MS Bucket Size | -> | Sent
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| 0x13 | 11.3.22 | MS Radio Access Capability | <- | Received
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| 0x14 | 11.3.23 | OMC Id | <- | Received
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| 0x15 | 11.3.24 | PDU In Error | <-/-> | Received/Sent
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| 0x16 | 11.3.25 | PDU Lifetime | <- | Received
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| 0x17 | 11.3.27 | Priority | <- | Received
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| 0x19 | 11.3.29 | Radio Cause | -> | Sent
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| 0x1a | 11.3.30 | RA-Cap-UPD-Cause | -> | Sent
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| 0x1b | 11.3.31 | Routeing Area | <-/-> | Received/Sent
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| 0x1c | 11.3.32 | R_default_MS | -> | Sent
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| 0x1d | 11.3.33 | Suspend Reference Number | <-/-> | Received/Sent
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| 0x1e | 11.3.34 | Tag | <-/-> | Received/Sent
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| 0x1f | 11.3.35 | TLLI | <-/-> | Received/Sent
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| 0x20 | 11.3.36 | TMSI | <-/-> | Received/Sent
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| 0x21 | 11.3.37 | Trace Reference | <- | Received
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| 0x22 | 11.3.38 | Trace Type | <- | Received
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| 0x23 | 11.3.39 | TransactionId | <- | Received
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| 0x24 | 11.3.40 | Trigger Id | <- | Received
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| 0x25 | 11.3.41 | Number of octets affected | -> | Sent
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| 0x26 | 11.3.18 | LSA Identifier List | -> | Sent
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| 0x27 | 11.3.19 | LSA Information | <- | Received
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| 0x28 | 11.3.42 | Packet Flow Identifier | <-/-> | Received/Sent
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| 0x3a | 11.3.43 | Aggregate BSS QoS Profile (ABQP) | <-/-> | Received/Sent
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| 0x3b | 11.3.45 | Feature Bitmap | <-/-> | Received/Sent
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| 0x3c | 11.3.46 | Bucket_Full Ratio | -> | Sent
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| 0x3d | 11.3.47 | Service UTRAN CCO (Cell Change Order) | <- | Received
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2016-02-29 14:09:55 +00:00
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|===
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==== IEs Not Conforming to TS 08.18
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.IEs not conforming to TS 08.18
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[options="header",cols="5%,10%,30%,55%"]
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|===
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| tag (hex) | TS 08.18 § | IE name | Description
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2016-03-04 17:16:58 +00:00
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| 0x18 | 11.3.28 | QoS Profile | Received value is ignored. Sent value is hardcoded to 0x4 (3 octets).
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2016-02-29 14:09:55 +00:00
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|===
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==== Additional Attributes and Parameters
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There are no OsmoPCU specific additional Attributes and Parameters.
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=== Details on IEs
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2016-03-04 17:16:58 +00:00
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==== BSS Area Indication
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This IE is ignored by OsmoPCU.
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==== Bucket Leak Rate
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The value used by OsmoPCU for this IE can be set through configuration file or vty via
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"flow-control force-ms-leak-rate <1-6553500>" command.
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==== BVC Bucket Size
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The value used by OsmoPCU for this IE can be set through configuration file or vty via
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"flow-control force-bvc-bucket-size <1-6553500>" command.
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==== Channel needed
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This IE is ignored because entire message which contains it is ignored by OsmoPCU - see <<paging_cs>> for details.
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==== DRX Parameters
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This IE is ignored by OsmoPCU.
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==== eMLPP-Priority
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This IE is ignored because entire message which contains it is ignored by OsmoPCU - see <<paging_cs>> for details.
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==== Flush Action
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This IE is ignored because entire message which contains it is ignored by OsmoPCU - see <<flush_ll>> for details.
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==== LLC Frames Discarded
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This IE is not available because entire message which contains it (LLC-DISCARDED) is not implemented by
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OsmoPCU - see for <<not_impl>> details.
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==== Location Area
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This IE is ignored by OsmoPCU.
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==== Mobile Id
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This IE is ignored because entire message which contains it is ignored by OsmoPCU - see <<invoke_trace>> for details.
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==== MS Bucket Size
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The value used by OsmoPCU for this IE can be set through configuration file or vty via
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"flow-control force-ms-bucket-size <1-6553500>" command.
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==== MS Radio Access Capability
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This IE is ignored by OsmoPCU.
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==== OMC Id
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This IE is ignored because entire message which contains it is ignored by OsmoPCU - see <<invoke_trace>> for details.
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==== Priority
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This IE is ignored by OsmoPCU.
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==== QoS Profile
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No QoS is supported by OsmoPCU so this IE is ignored or safe default used when mandatory.
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==== Radio Cause
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This IE is not available because entire message which contains it (RADIO-STATUS) is not implemented by
|
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|
|
OsmoPCU - see for <<not_impl>> details.
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==== RA-Cap-UPD-Cause
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|
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This IE is not available because entire message which contains it (RA-CAPABILITY-UPDATE-ACK) is not implemented by
|
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|
|
OsmoPCU - see for <<not_impl>> details.
|
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==== Routeing Area
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This IE is ignored by OsmoPCU upon receiving.
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The messages which might require this IE to be send are not implemented by OsmoPCU - see for <<not_impl>> details.
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==== Suspend Reference Number
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This IE is ignored by OsmoPCU upon receiving.
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|
The messages which might require this IE to be send are not implemented by OsmoPCU - see for <<not_impl>> details.
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==== Tag
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This IE currently only used by OsmoPCU for Flow Control procedure (TS 08.18 § 8.2). In other cases it's either ignored or unavailable.
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==== Trace Reference
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|
This IE is ignored because entire message which contains it is ignored by OsmoPCU - see <<invoke_trace>> for details.
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==== Trace Type
|
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|
|
This IE is ignored because entire message which contains it is ignored by OsmoPCU - see <<invoke_trace>> for details.
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==== TransactionId
|
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|
|
This IE is ignored because entire message which contains it is ignored by OsmoPCU - see <<invoke_trace>> for details.
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==== Trigger Id
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|
This IE is ignored because entire message which contains it is ignored by OsmoPCU - see <<invoke_trace>> for details.
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|
==== Number of octets affected
|
|
|
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|
|
This IE is not available because the messages which contains it (FLUSH-LL-ACK and LLC-DISCARDE) are not implemented by
|
|
|
|
OsmoPCU - see for <<not_impl>> details.
|
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|
==== LSA Information
|
|
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|
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|
|
This IE is ignored by OsmoPCU.
|
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|
==== LSA Identifier List
|
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|
|
This IE is not implemented by OsmoPCU.
|
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|
|
==== Packet Flow Identifier
|
|
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|
|
This IE is ignored by OsmoPCU upon receiving.
|
|
|
|
The messages which might require this IE to be send are not implemented by OsmoPCU - see for <<not_impl>> details.
|
|
|
|
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|
|
==== Aggregate BSS QoS Profile (ABQP)
|
|
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|
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|
|
|
This IE is ignored by OsmoPCU upon receiving.
|
|
|
|
The messages which might require this IE to be send are not implemented by OsmoPCU - see for <<not_impl>> details.
|
|
|
|
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|
|
==== Feature Bitmap
|
|
|
|
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|
|
This IE is not implemented by OsmoPCU.
|
|
|
|
This IE is ignored by OsmoPCU when received.
|
|
|
|
Absence of Feature Bitmap automatically disables optional features for Network Service Entity (NSE) communicating with OsmoPCU.
|
|
|
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|
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|
|
==== Bucket_Full Ratio
|
|
|
|
|
|
|
|
This IE is not implemented by OsmoPCU.
|
|
|
|
|
|
|
|
==== Service UTRAN CCO (Cell Change Order)
|
|
|
|
|
|
|
|
This IE is ignored by OsmoPCU.
|
2016-02-29 14:09:55 +00:00
|
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|
|
|
|
=== Gb BSSGP Initialization / PCU bring-up
|
|
|
|
|
2016-03-04 17:16:58 +00:00
|
|
|
The BSSGP initialization directly follows NS connection establishment described in <<ns_init>>.
|
|
|
|
OsmoPCU allocates BVC context for BVCI given by OsmoBTS which in turn gets it from OpenBSC.
|
|
|
|
In addition to BVCI identifying OsmoPCU side of BSSGP connection there is also special BVCI which is accepted by OsmoPCU
|
|
|
|
in accordance with TS 08.18 § 5.4.1: BVCI = 0 represents signaling data between SGSN and PCU in contrast
|
|
|
|
to PTP (Peer-To-Peer) user's data.
|
|
|
|
The mapping between BSSGP PDUs and signaling or PTP BVCIs is available in TS 08.18 Table 5.4.
|