laforge has submitted this change. ( https://gerrit.osmocom.org/c/osmo-bsc/+/32032 ) ( 2 is the latest approved patch-set. No files were changed between the latest approved patch-set and the submitted one. )Change subject: doc: bts-examples: discuss Ericsson RBS EGPRS configuration ...................................................................... doc: bts-examples: discuss Ericsson RBS EGPRS configuration Add a configuration file example to illustrate how exactly EGPRS is configured on ericsson RBS BTSs. Related: OS#5198 Change-Id: I2fb5b4d9300b16b0fac48f33b5db81442ab25031 --- M doc/manuals/chapters/bts-examples.adoc M doc/manuals/chapters/running.adoc 2 files changed, 148 insertions(+), 1 deletion(-) Approvals: laforge: Looks good to me, approved Jenkins Builder: Verified diff --git a/doc/manuals/chapters/bts-examples.adoc b/doc/manuals/chapters/bts-examples.adoc index f840b39..27278fb 100644 --- a/doc/manuals/chapters/bts-examples.adoc +++ b/doc/manuals/chapters/bts-examples.adoc @@ -175,6 +175,7 @@ between the two nanoBTS units, as well as the coaxial/RF AUX cabling. ==== +[[example_e1_cfg]] === Example configuration for OsmoBSC with E1 BTS The following configuration sample illustrates the usage of BTSs that are @@ -273,6 +274,139 @@ <9> The bandwidth of one E1 timeslot matches the bandwidth of 4 GSM air interface timeslots. The E1 timeslot is split up into four sub-slots, which are then assigned to one GSM air interface timeslot each. Since the first timeslot on the first TRX is already used for signaling we begin the sub-slot counting with sub-slot 1 for alignment reasons. +=== Example configuration for OsmoBSC with Ericsson RBS E1 BTS and EGPRS + +The following example illustrates the usage of Ericsson RBS2000/RBS6000 BTSs. +This classic E1 BTS has no built in PCU and therefore requires the configuration +of a BSC co-located OsmoPCU (see also: <<cfg_bsc_co_located_pcu>>). + +It should also be noted that the Ericsson RBS2000/RBS6000 series is the first +BTS of this type to be supported by OsmoBTS and OsmoPCU. The implementation has +been made possible through funding by the NLnet Foundation. + +Ericsson RBS2000/RBS6000 BTSs feature two GPRS modes. A 16kbps GPRS mode where +only CS1 and CS2 are supported and an EGPRS mode where MCS1 to MCS9 are +supported. OsmoPCU offers support for both modes but since the 16kbps mode only +supports classic GPRS with CS1 and CS2 it is more of experimental interest +and shall not be discussed further. The following example will describe how +to configure the 64kbps mode with EGPRS. + +In the following example we also expect that the user is already familliar +with the E1 configuration example above (see also: <<example_e1_cfg>>) + +.OsmoBSC configured for single-TRX E1 Ericsson DUG20 with EGPRS +==== +---- +e1_input + e1_line 0 driver dahdi + e1_line 0 port 3 +network + network country code 1 + mobile network code 1 + encryption a5 0 + neci 1 + handover 0 + pcu-socket /tmp/pcu_bts <1> + bts 0 + type rbs2000 + band GSM900 + om2000 version-limit oml gen 12 rev 10 + cell_identity 0 + location_area_code 0x0001 + training_sequence_code 7 + base_station_id_code 63 + ms max power 15 + cell reselection hysteresis 4 + rxlev access min 0 + channel allocator mode set-all ascending + rach tx integer 9 + rach max transmission 7 + oml e1 line 0 timeslot 1 sub-slot full + oml e1 tei 62 + gprs mode egprs <2> + gprs routing area 0 + gprs network-control-order nc0 + gprs cell bvci 2 + gprs nsei 101 + gprs nsvc 0 nsvci 101 + gprs nsvc 0 local udp port 23100 + gprs nsvc 0 remote udp port 23000 + gprs nsvc 0 remote ip 127.0.0.1 + gprs nsvc 1 nsvci 0 + gprs nsvc 1 local udp port 0 + gprs nsvc 1 remote udp port 0 + gprs nsvc 1 remote ip 0.0.0.0 + is-connection-list add 4 712 36 <3> + trx 0 + rf_locked 0 + arfcn 123 + nominal power 42 + max_power_red 12 + rsl e1 line 0 timeslot 1 sub-slot full + rsl e1 tei 0 + timeslot 0 + phys_chan_config CCCH+SDCCH4 + hopping enabled 0 + e1 line 0 timeslot 1 sub-slot full + timeslot 1 + phys_chan_config TCH/F + hopping enabled 0 + e1 line 0 timeslot 3 sub-slot full <4> + timeslot 2 + phys_chan_config TCH/F + hopping enabled 0 + e1 line 0 timeslot 4 sub-slot full + timeslot 3 + phys_chan_config TCH/F + hopping enabled 0 + e1 line 0 timeslot 5 sub-slot full + timeslot 4 + phys_chan_config TCH/F_TCH/H_SDCCH8_PDCH <5> + hopping enabled 0 + e1 line 0 timeslot 6 sub-slot full + timeslot 5 + phys_chan_config TCH/F + hopping enabled 0 + e1 line 0 timeslot 7 sub-slot full + timeslot 6 + phys_chan_config TCH/F + hopping enabled 0 + e1 line 0 timeslot 8 sub-slot full + timeslot 7 + phys_chan_config TCH/F + hopping enabled 0 + e1 line 0 timeslot 9 sub-slot full +---- +==== + +<1> This configures the PCU socket path (see also: <<cfg_bsc_co_located_pcu>>) + +<2> This configures the general GPRS parameters. The configuration is no +different from BTS with built-in PCU. + +<3> The Ericsson RBS2000/RBS6000 series has an built in “Interface Switch” (IS) +that offers flexible way to reconfigure the interconnection between the internal +components of the BTS and the external E1 line. Since 16kbps subslots cannot +supply the bandwidth required for EGPRS the IS must be configured to connect +the 64kbps interface of the TRU to the external E1 line. For a more detailed +description of the IS see <<cfg_ericsson_rbs_is>>. + +<4> Since we are using the 64kbps TRU interface we must configure a full E1 +timeslot per air interface time slot. For Speech this will have no effect on +the TRAU frame format. The only difference is that always the first 16kbps +subslot of the assigned E1 timeslot is used. OsmoMGW will be instructed +accordingly by OsmoBSC, so no re-configuration of OsmoMGW is required. + +<5> In this example we will use air interface TS 4 as PDCH. As mentioned +earlier Ericsson RBS2000/RBS6000 supports the 'DYNAMIC/OSMOCOM' timeslot model. +PDCH timeslots must be configured as dynamic timeslots. It is not possible to +configure static PDCHs. Therefore the phys_chan_config must be set to +TCH/F_TCH/H_SDCCH8_PDCH in order to use the air interface timeslot as PDCH. + +NOTE: As of March 2023 the BSC co-located PCU support for Ericsson RBS was +tested only with a single BTS. Even though OsmoBSC and OsmoPCU should be able +to handle multiple BTS, unexpected bahviour should be taken into account. + === E1 Line number and MGCP trunk number The switching of the voice channels is done via OsmoMGW, which acts as a media converter between E1 and VoIP (RTP). OsmoBSC will use the E1 line number to diff --git a/doc/manuals/chapters/running.adoc b/doc/manuals/chapters/running.adoc index 6d690ce..54c36c9 100644 --- a/doc/manuals/chapters/running.adoc +++ b/doc/manuals/chapters/running.adoc @@ -219,7 +219,7 @@ More detailed configuration is described in <<smlc-config>>. - +[[cfg_bsc_co_located_pcu]] ==== Configure BSC co-located PCU While small IP based BTSs usually come with a built in PCU (BTS co-located -- To view, visit https://gerrit.osmocom.org/c/osmo-bsc/+/32032 To unsubscribe, or for help writing mail filters, visit https://gerrit.osmocom.org/settings Gerrit-Project: osmo-bsc Gerrit-Branch: master Gerrit-Change-Id: I2fb5b4d9300b16b0fac48f33b5db81442ab25031 Gerrit-Change-Number: 32032 Gerrit-PatchSet: 3 Gerrit-Owner: dexter &lt;pmaier(a)sysmocom.de&gt; Gerrit-Reviewer: Jenkins Builder Gerrit-Reviewer: laforge &lt;laforge(a)osmocom.org&gt; Gerrit-MessageType: merged