OsmoPCU » History » Version 13
laforge, 02/19/2016 10:48 PM
fix osmo-sgsn link
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. |
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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 | 13 | laforge | It has been tested with [wiki:osmo-sgsn] as well as an Ericsson SGSN so far. |
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 | 12 | laforge | * Pure GPRS PCU, no EGPRS (EDGE) functionality (yet) |
42 | 7 | jolly | * Timeslots have to be assigned dedicated as a PDCH, no dynamic PDCH/TCH switching |
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 | 1 | laforge | * No PTCCH support |
51 | 12 | laforge | |
52 | == Authors / Credits == |
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53 | |||
54 | osmo-pcu was originally developed by Ivan Kluchnikov and Andreas Everberg. |
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55 | |||
56 | Today it is maintaned by Holger Freyther and Jacob Erlbeck at sysmocom. |