In PCUIF v.11 we use PCU_IF_SAPI_AGCH_2 exclusively. We use this SAPI
to transfer IMMEDIATE ASSIGNMENT messages for uplink and downlink. One
new feature of PCU_IF_SAPI_AGCH_2 is that the PCU may ask to send a
confirmation when the MAC block is sent.
CAUTION: This patch breaks compatibility to current master osmo-pcu (See
also "Depends")
Related: OS#5927
Depends: osmo-pcu.git I9effdcec1da91a6e2e7a7c41f95d3300ad1bb292
Change-Id: I709c27adaf09a6766cfde4d76d878626d30ebb3c
Since osmo-bsc uses RSL (with a propritary Ericsson RBS specific
extension) to send a confirmed IMMEDIATE ASSIGNMENT messages via
PCH, we can not just forward the MAC blocks into the paging queue
without determining whether the MAC block is a PAGING message or an
IMMEDIATE ASSIGNMENT message. the reason for this is that RSL uses
two different message types (IMMEDIATE ASSIGNMENT COMMAND and PAGING
COMMAND) to process IMMEDIATE ASSIGNMENT and PAGING messages.
This means we have to look into the MAC block to make sure whether
the message is a PAGING message or an IMMEDIATE ASSIGNMENT message.
We also need to make sure that the confirm flag is properly executed.
In the case of the IMMEDIATE ASSIGNMENT this means we have to include
(confirm=true) or not include (confirm=false) the RSL_IE_ERIC_MOBILE_ID
into the IMMEDIATE ASSIGNMENT COMMAND message.
In the case of PAGING we directly echo a confirmation after sending
the PAGING COMMAND via RSL when a confirmation is requested.
Related: OS#5927
Depends: osmo-pcu.git Ia202862aafc1f0cb6601574ef61eb9155de11f04
Change-Id: I3d2842626b7e8325860ea3160c7d900d39e953a0
To confirm downlink IMMEDIATE ASSIGNMENT messages, we use the TLLI as an
identifier and the related struct member is also called "tlli".
Unfortunately this is misleading since the message identifier does not
necessarly have to be a TLLI. It is just an implementation detail that
osmo-pcu uses the TLLI as a message identifier.
To make that clear, lets rename the tlli member (and variable and
parameter names where it is passed on) to "msg_id".
(Since this change only renames variables and struct members it will not
break compatibility with other programs that use the PCUIF)
Related: OS#5927
Depends: osmo-pcu.git I4a25039dfe329e68879bc68936e49c4b190625e6
Change-Id: Ifb3f257099b52c50e525768484f9e93282089d0f
struct lchan_activate_info and struct lchan_modify_info use an enum to
define, if the channel type is for a normal channel, a VAMOS channel or
a VGCS/VBS channel.
Change-Id: I21167eb4192c02cd7b5e1574cddb382a3feaebe0
The assignment is triggered by the MSC by sending an ASSIGNMENT REQUEST
with a group call reference. The reference is used to find the VGCS/VBS
channel that belogs to the referenced call.
The existing VGCS/VBS channel is reactivated. This will put the channel
into a state where the MS can establish the link on it, to complete the
assignment. The old connection is released by the MSC and assignment
completion is handled by the VGCS FSM.
Change-Id: Idaa864cd5ce4df6c3193494ce12d91523c104d89
Related: OS#4852
TALKER DETECTION and LISTENER DETECTION is used when the uplink is
accessed on the VGCS channel by a talker or listener.
Change-Id: I166d6d42c04337e669307943ecbb8eea6906b385
Related: OS#4852
RLL events are forwarded to VGCS FSM. Included L3 information are not
forwarded to gsm0408_rcvmsg(), but forwarded to VGCS FSM only.
Change-Id: I5e098a20225ba11206f43281f4da519a4086bae5
Related: OS#4852
"struct lchan_activate_info" is expanded to support flags for VGCS and
VBS. These are used to send the correct Channel Mode to the BTS.
"enum lchan_activate_for" is expanded to indicate and activation of
VGCS/VBS calls.
Change-Id: Ic0c0597d149d0758d6766937d99660fa02e0e139
Related: OS#4852
This message will be sent to each BTS with a VGCS/VBS channel to notify
the served MSs about ongoing group/broadcast calls. It is also used to
remove the notification, if the call is terminated.
Change-Id: I96ec0ee5d1a772a45f1ebfd64210718c8bf5aa58
Related: OS#4852
The PCUIF interface implementation in osmo-bsc provides two ways to
access the paging channel (PCH).
1) Under the SAPI PCU_IF_SAPI_PCH PAGING COMMAND messages are accepted
as whole MAC block but the format is in the style that we are going
to deprecate with PCUIF v.11. Also at the moment those PAGING COMMANDs
are not confirmed towards the PCU. This is also not necessary since
osmo-pcu would silently drop such confirmations. (see pcu_rx_data_cnf
in pcu_l1_if.cpp)
2) Under the SAPI PCU_IF_SAPI_PCH_DT messages are also accepded as
MAC blocks but the SAPI will only accept IMMEDIATE ASSIGNMENT messages.
The messages are encapsulated in a struct that holds IMSI (paging group)
and TLLI (used for confirmation) as separate struct members. The
messages are also confirmed towards the PCU as it should be.
Since we want to depreacete the older V.10 version of PCUIF and there is
not much benefit in maintaining two interfaces we should use
SAPI PCU_IF_SAPI_PCH_DT for both message types. This also requires small
adjustments to osmo-pcu (see Depends).
Depends: osmo-pcu.git I99cfe373fa157cfb32b74c113ad9935347653a71
Related: OS#5927
Change-Id: I82443f2b402aa2416469c8c50b1c050323ef3b8f
This function is used to check if the BTS is using the IPA Abis-IP
transport, and not whether its manufacturer/vendor is ip.access.
Let's use a less confusing name.
Change-Id: I202c58341c1536489064d2671c0842c6f70b5429
In abis_rsl_rx_rll(), we do the following header length check -- quick
challenge, can you spot the two bugs hidden here?
struct abis_rsl_rll_hdr *rllh;
if (msgb_l2len(msg) >
sizeof(struct abis_rsl_common_hdr) + sizeof(*rllh))
msg->l3h = &rllh->data[3];
Fix these bugs:
- struct abis_rsl_common_hdr is already included as the first member of
abis_rsl_rll_hdr, no need to add that.
- We are going to be accessing rrlh->data[3], so we must check for at
least sizeof(*rllh) + 4.
Change-Id: Ie4aee615c8c904ae8308ec0074d8bc5208137061
The A-bis/IP RTP CSD Format IR Values need to be shifted by 4 bits
instead of 5. See OsmoBTS Abis Protocol Specification § 5.8.14
RSL_IE_IPAC_RTP_CSD_FORMAT.
Related: https://ftp.osmocom.org/docs/osmo-bts/master/osmobts-abis.pdf
Related: OS#4393
Change-Id: I9ce0b2d9b77eef61a6d4dce417efe4e853217dc5
The signal is already there but not being used.
Let's further split generic paging code from RSL specificites.
Change-Id: Iabc1c29908a5136501d6dc6e60f8777dab511b86
Omit the A-bis/IP specific RSL_IE_IPAC_SPEECH_MODE, as it doesn't make
sense for circuit switched data.
Related: OS#4393
Change-Id: I6641b713177276bcf798f08123e1dd2e88ffdce6
It looks like the idea was to translate the CSD rate from BSSAP to
lchan_csd_mode before translating it to RSL. But instead we can just
directly translate the BSSAP value to the RSL value.
The previous code was not used yet (nothing wrote to csd_mode).
Related: OS#4393
Depends: libosmocore I25bfd02aa1428a35492b20376a31635a442e545f
Change-Id: Ice914744da3a2084e82d125848fb69404b8e8a36
The length parameter in rsl_imm_assign_cmd_common() may cause a buffer
overflow when it is chosen larger than GSM_MACBLOCK_LEN. Lets make sure
this cannot happen.
Change-Id: I9417b35fb8c0517f2555e17059bf8ac60fa59791
The IMMEDIATE ASSIGNMENT for downlink TBFs needs to be sent through the
PCH instead of the AGCH. Since this method is not specified in RSL, it
is usually a vendor specific extension.
Change-Id: I4452f4973d1ec69c96aad527b057226e8a6edf99
Related: OS#5198
The formula that is used to recover the (relative) frame number from the
T1, T2, T3 parameters matches the definition in the spec, but since the
partial term t3-t2 can be negative special precaution is required when
performing the MOD 26 operation. This is due to the truncated modulo
implementation in C/C++, which has a very specific understanding on how
to deal with negative input parameters.
The libosmocore gsm_gsmtime2fn(() offers a correct implementation, so
lets use it.
Change-Id: I5fb2b0ada8d409730ac22963741fb4ab0026abdd
Related: OS#5198
The (relative) frame number that is forwarded to the PCU is an
important parameter which is computed from t1,t3,t2.
Change-Id: I83d20ba9e0ce6488d458ccf4a85c8445c30e3a89
When a CHAN RQD is received via RSL, we show ra and other parameters.
Lets also show T1, T3 and T2.
Change-Id: I78499b49ae176b736e384e193fadc0bdd669dffa
The frame number calculation in rsl_rx_pchan_rqd() is done using a
specific formula. Lets add a spec reference and also restructure the
code a bit.
Change-Id: I60500c8694dbc2e6e2c4bbffd4ff7057bbc324e6
The function rsl_ericsson_imm_assign_cmd has a comment "Chapter 8.5.6"
above it. However, thats only half true. The function implements
ericsson vendor specific RSL IEs, so lets be more clear about this in
the spec reference.
Change-Id: Id27662e208ca8ac0a48851583c11fbacf85f988c
The CHAN REQ entry is not deleted after its information was passed on to
the PCU. This causes the same entry to be used over and over again while
blocking other incoming CHAN RQD.
Change-Id: Ia4abc55fc6fcb1c00991cc84d09529131d014910
Related: OS#5198
We expect osmo-bts to provide us with a remote CID in order to be able
to set up MGW to send Osmux frames to it.
Related: SYS#5987
Change-Id: Ia90e8e0d18193d64c0fa0788dbd0eb242a359b61
It is really difficult right now to find out where all the different
stuff relative to operation and lifecycle of an lchan is. Let's move
everything to its own file to have all the related defines and logic
together.
Change-Id: Idd855d126c43ac6576c5f3ba7e0b8014127a65e1
This API has been available since 1.0.0, and we actually require
libosmocore >= 1.7.0 nowadays, so it's totally fine using the
libosmocore API and drops the local duplicate.
Change-Id: I95c59b31cf1b08e1d513b589ef386d2dd55f09a2
This change implements an additional channel allocation mode, which
can be employed during a TCH channel allocation for assignment.
Selection between ascending and descending order is performed
depending on pre-configured parameters:
* Uplink RxLev threshold and number of samples for averaging,
* C0 (BCCH carrier) channel load threshold.
This is useful in setups where Tx power of the RF carriers cannot be
adjusted +dynamically at run-time and thus BS Power Control cannot
be performed. In such setups the BCCH carrier is transmitting at
relatively higher power than the other RF carriers. The key idea
is to allocate channels in a smarter way, so that UEs with poor signal
would get channels on carriers with high Tx power, while UEs with good
signal could use carriers with lower Tx power.
Change-Id: I1b7a0d706976b73cc5c30a8714b830811addfe8d
Related: osmo-ttcn3-hacks.git Ia522f37c1c001b3a36f5145b8875fbb88311c2e5
Related: SYS#5460
A follow-up patch implements a special channel allocation mode, which is
only working for assignment (basically TCH selection for a voice call).
This mode cannot be employed for initial CHANNEL REQUEST or handover due
to the absence of an already established lchan.
Adding this mode to the existing VTY command syntax would be confusing:
channel allocator (ascending|desscending|dynamic)
^^^^^^^
so this patch extends the VTY syntax in a way that it becomes possible
to configure different channel allocator modes for different cases:
OsmoBSC(config-net-bts)# channel allocator mode ?
set-all Set a single mode for all variants
chan-req Channel allocation for CHANNEL REQUEST (RACH)
assignment Channel allocation for assignment
handover Channel allocation for handover
The old command syntax, which is basically 'set-all', is kept for
backwards compatibility, but marked as deprecated.
Change-Id: I3ae73b36ee9433cc768376b56f0765e5f416162f
Related: SYS#5460
For statistical clarity and site tuning, it is sometimes
desirable to completely disable the use of TCH for signaling.
In the existing version of this VTY command, there is no way to
accomplish this. We can only restrict TCH for signaling non-voice
related actions.
This patch deprecates 'allow-tch-for-signalling (0|1)' and
adds 'tch-signalling-policy (never|emergency|voice|always)' to
provide more options.
Change-Id: I4459941ddad4e4a3bec8409b180d9a23a735e640
The all_allocated_update_bsc() does inefficient iterating to count
active/inactive lchans, which scales badly for high numbers of TRX
managed by osmo-bsc.
We need to update the all_allocated flags immediately (periodic counting
alone would suffer from undersampling), so, until now, we are calling
this inefficient function every time a channel state changes.
Instead of iterating all channels for any chan state changes anywhere,
keep global state of the current channel counts, and on channel state
change only update those ts, trx, bts counts that actually change.
A desirable side effect: for connection stats and handover decision 2,
we can now also use the globally updated channel counts and save a bunch
of inefficient iterations.
To get accurate channel counts at all times, spread around some
chan_counts_ts_update() calls in pivotal places. It re-counts the given
timeslot and cascades counter changes, iff required.
Just in case I missed some channel accounting, still run an inefficient
iterating count regularly that detects errors, logs them and fixes them.
No real harm done if such error appears. None show in ttcn3 BSC_Tests.
It is fine to do the inefficient iteration once per second; channel
state changes can realistically happen hundreds of times per second.
Related: SYS#5976
Change-Id: I580bfae329aac8d4552723164741536af6512011
Use the same one as used to decode the message in osmo-bts.
This patch doesn't cause a change in logic since both headers are binary
identical.
Change-Id: Ideb863fdaedf77caac1a320de6696ba4f507a398
After the lchan release, the gscon would go into the Clear dance with an
arbitrary cause value. Instead, explicitly ask for a Clear upon
pre-emption, with the proper cause value.
Related: OS#5535
Change-Id: I20108f7b4769400b89b7b0d65c8dab883bf87c46
The variables are unsigned, so -1 gets actually translated to UNIT16_MAX
when the value is casted to uint16_t. Let's do that explicitly so that
readers don't think those are signed variables.
Change-Id: I02ad80e5d10f1a47cdf712f7f7c576a2e20fe607
Matan Perelman
Philipp Maier
Oliver Smith
Harald Welte
Neels Hofmeyr
Pau Espin
Vadim Yanitskiy