Network service (NS) » History » Version 1
lynxis, 01/27/2021 10:02 PM
| 1 | 1 | lynxis | h1. Network service (NS) / 3GPP 48.016 |
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| 2 | |||
| 3 | libosmocore contains 2 network service implementation: |
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| 4 | |||
| 5 | * gprs_ns (1) |
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| 6 | * gprs_ns2 |
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| 7 | |||
| 8 | h3. gprs_ns (1) |
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| 9 | |||
| 10 | Has been started in 2012. It doesn't use FSMs and can only support |
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| 11 | a single type of NS-VL at the same time. Supported NS-VL dialects: |
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| 12 | |||
| 13 | * IP/UDP/ip.access (RESET/BLOCK/UNBLOCK) |
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| 14 | * IP/UDP/static (Alive) |
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| 15 | * IP/UDP/SNS dynamic configuration (client only) |
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| 16 | * Frame Relay over GRE |
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| 17 | |||
| 18 | h3. gprs_ns2 |
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| 19 | |||
| 20 | The gprs_ns2 has been started to re-implement network service with FSMs in 2020 |
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| 21 | and has a generalized approach. It can support multiple types of NS-VL: |
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| 22 | |||
| 23 | * IP/UDP/ip.access (RESET/BLOCK/UNBLOCK) |
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| 24 | * IP/UDP/static (Alive) |
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| 25 | * IP/UDP/SNS dynamic configuration (client only) |
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| 26 | * Frame Relay |
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| 27 | * -frame relay over GRE- has been prepared but without a test device it has been disable |
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| 28 | |||
| 29 | h2. Breaking changes between gprs_ns (1) and gprs_ns2 |
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| 30 | |||
| 31 | The vty configuration is different and *incompatible* between gprs_ns (1) and gprs_ns2. The osmocom projects which uses |
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| 32 | NS will be migrating to the new gprs_ns2. |
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| 33 | |||
| 34 | h3. osmo-pcu |
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| 35 | |||
| 36 | The osmo-pcu is configured via the PCU socket from the BTS. The BTS is receiving the related configuration from BSC. |
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| 37 | With the new gprs_ns2 api it's only possible to configure timeouts. |
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| 38 | |||
| 39 | valid example for gprs_ns (1) and gprs_ns2: |
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| 40 | <pre> |
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| 41 | ns |
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| 42 | timer tns-block 3 |
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| 43 | timer tns-block-retries 3 |
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| 44 | timer tns-reset 3 |
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| 45 | timer tns-reset-retries 3 |
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| 46 | timer tns-test 30 |
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| 47 | timer tns-alive 3 |
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| 48 | timer tns-alive-retries 10 |
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| 49 | |||
| 50 | pcu |
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| 51 | gb-dialect ip-sns |
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| 52 | </pre> |
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| 53 | |||
| 54 | h3. osmo-sgsn |
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| 55 | |||
| 56 | The osmo-sgsn.cfg needs to be migrated by hand. |
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| 57 | |||
| 58 | h4. example UDP configuration. |
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| 59 | |||
| 60 | Old (gprs_ns (1)) configuration |
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| 61 | |||
| 62 | <pre> |
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| 63 | ns |
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| 64 | timer tns-block 3 |
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| 65 | timer tns-block-retries 3 |
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| 66 | timer tns-reset 3 |
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| 67 | timer tns-reset-retries 3 |
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| 68 | timer tns-test 30 |
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| 69 | timer tns-alive 3 |
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| 70 | timer tns-alive-retries 10 |
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| 71 | encapsulation udp local-ip 127.0.0.1 |
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| 72 | encapsulation udp local-port 23000 |
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| 73 | encapsulation framerelay-gre enabled 0 |
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| 74 | </pre> |
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| 75 | |||
| 76 | New (gprs_ns2) configuration |
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| 77 | |||
| 78 | <pre> |
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| 79 | ns |
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| 80 | timer tns-block 3 |
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| 81 | timer tns-block-retries 3 |
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| 82 | timer tns-reset 3 |
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| 83 | timer tns-reset-retries 3 |
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| 84 | timer tns-test 30 |
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| 85 | timer tns-alive 3 |
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| 86 | timer tns-alive-retries 10 |
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| 87 | bind udp local |
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| 88 | listen 127.0.0.1 23000 |
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| 89 | accept-ipaccess |
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| 90 | </pre> |
