OsmoPCU » History » Version 11
laforge, 02/19/2016 10:48 PM
update outdated information on pcu
| 1 | 3 | laforge | [[PageOutline]] |
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| 2 | 1 | laforge | = osmo-pcu = |
| 3 | |||
| 4 | 3 | laforge | A PCU (Packet Control Unit) is one of the two GPRS elements in the BSS. It implements the RLC and MAC layers of the GPRS |
| 5 | Um (radio) interface on the MS-facing side, as well as the Gb Interface (NS,BSSGP) on the SGSN-facing side. |
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| 6 | 1 | laforge | |
| 7 | 3 | laforge | osmo-pcu is the Osmocom implementation of this PCU functionality. |
| 8 | |||
| 9 | 4 | ipse | It implements a custom L1 interface that can be used with [wiki:OsmoBTS] (specifically its |
| 10 | 1 | laforge | [http://www.sysmocom.de/products/sysmobts sysmoBTS] back-end), and also with |
| 11 | 11 | laforge | [wiki:OsmoTRX]. |
| 12 | 1 | laforge | |
| 13 | 3 | laforge | Towards the SGSN, the BSSGP and NS protocols are implemented over UDP/IP, sometimes called "NS over IP". |
| 14 | It has been tested with [wiki:OsmoSGSN] as well as an Ericsson SGSN so far. |
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| 15 | 1 | laforge | |
| 16 | 11 | laforge | osmo-pcu is now considerd stable and already performing useful service for a number of users, but as one |
| 17 | of the more recent additions to the Osmocom family, there still is plenty of area for improvement. |
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| 18 | 1 | laforge | |
| 19 | == Source Code == |
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| 20 | |||
| 21 | The source code is available from git://git.osmocom.org/osmo-pcu.git |
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| 22 | |||
| 23 | You can browse it online via http://cgit.osmocom.org/cgit/osmo-pcu/ |
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| 24 | 4 | ipse | |
| 25 | 3 | laforge | |
| 26 | 1 | laforge | == Mailing List == |
| 27 | |||
| 28 | 10 | laforge | There is a mailing list for (development) discussion regarding the PCU: osmocom-net-gprs@lists.osmocom.org |
| 29 | You can subscribe to it (or manage your subscription) at http://lists.osmocom.org/cgi-bin/mailman/listinfo/osmocom-net-gprs |
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| 30 | 3 | laforge | |
| 31 | == Status == |
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| 32 | 5 | daniel | Information about testing is available here: [wiki:GPRS-testing] |
| 33 | 3 | laforge | |
| 34 | === Supported === |
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| 35 | 11 | laforge | * GPRS CS1 to CS4 with dynamik link/rate adaption |
| 36 | 3 | laforge | * single-slot and multi-slot operation on downlink |
| 37 | 11 | laforge | * single-slot operation on uplink |
| 38 | 3 | laforge | |
| 39 | === Shortcomings / Limitations / Restrictions === |
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| 40 | |||
| 41 | 7 | jolly | * Pure GPRS PCU, no EGPRS (EDGE) functionality |
| 42 | * Timeslots have to be assigned dedicated as a PDCH, no dynamic PDCH/TCH switching |
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| 43 | * No support for hand-over of any sort yet |
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| 44 | * No support of processing measurement reports |
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| 45 | * No timing advance loop, i.e. maximum cell radius 2-3 km |
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| 46 | * No Packet Access Reject message on congestion, access is just ignored |
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| 47 | 8 | jolly | * No PCCCH support |
| 48 | * Only "Dynamic allocation RLC data block transfer" is supported |
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| 49 | * No network controlled measurement/cell reselection order supported |
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| 50 | * No PTCCH support |
