An MPH-INFO message is used to turn detection of uplink access bursts on
or off. Whenever the uplink on a voice group channel is free, the uplink
access burst detection is turned on. When the uplink access is granted
to a talker or when the calling subscriber has been assigned to the
channel, the uplink access burst detection is turned off until the
uplink becomes free again.
Related: OS#4851
Depends: libosmocore.git Ibd6a1d468a70126a8f67e944fcb916969cc3c36b
Change-Id: I92d6773a3a463eb747143c85aa149e54c1fda122
The location of the NCH is defined by the rest octet of System
Information 1. If NCH is defined, the given CCCH blocks are used for NCH
instead of AGCH/PCH.
The current list of VGCS/VBS call notifications is transmitted on the
NCH. If there is no notification, an empty notification is transmitted
on the NCH.
The Notification List Number (NLN) is used to indicated new
notificaitons. Only the last notification (or empty notification)
indicates NLN. This way the MS can determine after two equal NLN that
the complete list has been recevied.
Change-Id: I82fdaba3faaced76267a99ae14a5458a1b41fdaa
Related: OS#5781
Random access is allowed on VGCS / VBS channels to access the uplink or
to detect listeners. Uplink Access from a listener is only reported once
after activating the channel. Uplink Access from a talker is reported
each time the uplink becomes occupied. RSL TALKER/LISTENER DETECT
messages are sent to the bsc.
The VGCS UPLINK GRANT message is sent by the BTS itself. Timer T3115 is
used to repeat the message up to NY2 times until one valid frame is
received from the MS (CM service request). The UPLINK BUSY / UPLINK FREE
message must be sent by the BSC.
The uplink is released by UPLINK RELEASE message from the MS or from the
BSC. Afterwards the UPLINK FREE message causes the MS to leave the
uplink without any acknowlege. An RSL REL-REQ must be used to terminate
the link locally. (Without layer 2 DISC procedure.)
Change-Id: I1bd07ab6802341b09a06e89df356665ffaf6d2bf
Related: OS#4851
For the sake of consistency, call repeated_dl_facch_active_decision()
from handle_ms_meas_report(), so we have all functions using the
measurement results for Downlink executed in a single place.
Change-Id: Ibd5377ce642e49161f320ac8c33e9f966b3ddfaf
Related: SYS#5114, SYS#5319
3GPP TS 44.006, section 10 describes a method how the downlink
FACCH transmission can be repeated to increase transmission
reliability.
Change-Id: I72f0cf7eaaef9f80fc35e752c90ae0e2d24d0c75
Depends: libosmocore I6dda239e9cd7033297bed1deb5eb1d9f87b8433f
Related: OS#4796 SYS#5114
For osmo-bts-sysmo the MPH INFO MEAS IND indication is still sent
separately. Lets merge the measurement information into the PH DATA
Change-Id: Iffe7865727fbf9bca8eb32a96e8ea05cf718a948
Related: OS#2977
Add a new common L1 SAPI enum, to unify all the BTS specific SAPIs.
Translate to this enum, and set the context for uplink messages in
each BTS specific implementation.
Set the context for downlink messages in the common l1sap code, by
converting the osmo_phsap_prim back to the SAPI value (mostly looking at
chan_nr). The new functions for doing this conversion,
get_common_sapi_by_trx_prim() and get_common_sapi_ph_data(), are based
on the existing to_gsmtap() and gsmtap_ph_data() functions.
Note that we can't set the uplink SAPI context in the common code,
because then we can't set it as early as possible. In this patch, the
SAPI context is set for the PHYs where the SAPI is readily available.
With additional conversion from the RSL channel, the SAPI context could
be set for osmo-bts-trx in a follow up patch.
Related: OS#2356
Depends: (libosmocore) I814cb3328d99faca9220adb5a80ffb934f219d7d
Change-Id: I6b7bb2e1d61502b61214f854a4ec5cbb7267545b
Currently we don't distinguish between CBCH on BCCH+SDCCH/4 and
CBCH on SDCCH/8, but in libosmogsm we have two independent
(non-standard) RSL channel number values for them. Maybe some day
we will, so let's extend the definition of L1SAP_IS_CHAN_CBCH.
Change-Id: I2f6d501a29edaf89dfb17d5d64f930cdb1943630
Before this patch it was being coded as SDCCH4 TS0 SS 0, and as a
result the state LCHAN_REL_ACT_OML applied in opstart_compl in abused
SDCCH4 TS0 SS 4 was not being checked when deciding whether to send a
Chan Act ACK in rsl_tx_chan_act_acknack.
Fixes: OS#3513
Change-Id: I1641960c9ffbb3ed0de74ab5b53e24e5b4ff3397
The existing implementation used a simplistic macro, which was wrong
in many ways:
1) it returned a negative value for "fn % 51 < 5" conditions without
raising any error message or asserting
2) it returned a wrong block number for many different input frame
numbers, as it didn't account properly for the FCCH/SCH gaps between
the blocks
Let's replace the simplistic macro with a proper lookup table based on
TS 05.02, and let's OSMO_ASSERT() if this is ever called with non-CCCH
frame numbers.
Change-Id: I11fd6cc558bb61c40c2019e46f56c1fe78ef39f5
Closes: OS#3024
for some historical reason, CBCH handling was not using the normal
L1SAP boundary. Let's change that and traverse L1SAP just like for
e.g. BCCH which is quite similar to CBCH handling.
This also has the added benefit of logging CBCH via GSMTAP.
Change-Id: Ibdba4c5e808330f8406f441a97fe0e81170fce97
Closes: OS#3534
The parameter bs_ag_blks_res, which is loaded into the BTS via the SI3
setting, defines how many of the CCCH blocks shall be used for AGCH. The
remaining CCCH blocks will then be available as PCH for paging.
Unfortunately there is no unit-test yet that verifies that all of the 8
different settings for bs_ag_blks_res.
- Separate the the decision logic that checks if a given fn is part of
an AGCH into a function to have it available in the unit-test.
- Add a test that checks all possible bs_ag_blks_res settings.
Change-Id: Ib9652f4013a4da3766852f8f03ce9ec5590f6989
Related: OS#1575
So far, L1SAP code is hiding RSL_CHAN_OSMO_PDCH from the bts specific
code below L1SAP. This is some kind of a hack/workaround, making code
and debug output / logs more difficult to understand.
So let's teach the lower layer how to treat RSL_CHAN_OSMO_PDCH and
remove the "hiding" code from the common l1sap.c code.
Change-Id: Iaaa833febe45b82166d3901f10cc5466a7591c19
We want to always call l1if_tch_rx and l1sap_up in order to avoid losing triggering
events on the upper layer.
With this change, the upper layer will increase correctly seq + ts for
RTP. It will then send an RTP packet with only the header and no payload, which is
not correct but at least we avoid drifting the RTP clock. Upcoming patch
in the series solves this issue.
This patch assumes that we are not lossing data events from the physical
layer and that we receive an event every 20ms, even if the MS is not
transmitting due to DTX.
Depends on libosmocore If4ae20c22b881e94585dad710f17b9e37f77bf82
Change-Id: If5df8940fab833eb4e3ed851880b66987d356031
The macro L1SAP_IS_PTCCH(fn) only detects a PTCCH channel at fn%52 = 12,
the detection logic has been extended in order to detect PTCCH at fn%52 = 38.
See also 3GPP TS 05.02, Clause 7, Table 6 of 9
Change-Id: Ia6f3333121e5e920c5e1d562a081d0a1b58a1153
The ra parameter indicates the reason for the received rach
request. osmo-bts uses the ra parameter to determine if the
received rach request is packet access related. If yes,
osmo-bts will forward the request to the PCU.
In order to determine if the ra is packet related or not,
the higher 4 bits must be equel to 0x7 and at least one of
the lower 4 bits must be zero.
The current method lacks checking of the lower 4 bits. It
would also accept 0b01111111, which is reserved for future
use. This commit extends the check to take also the last
4 bits into accound.
See also: 3GPP TS 04.08, Table 9.9
Change-Id: I5eb88c42a91e158d9bfa4105ec9636035baf8959
If Marker bit is set than it's a talkspurt which we have to explicitly
indicate to L1 by first sending ONSET message and than actual voice
data in a separate message.
This change affect sysmobts and LC15 hw.
Change-Id: I88c41568bcb0d82699f617adc4ad192603dd1bb6
Related: OS#1750
We have seen that the DSP time to time rejects PTCCH message from BTS due to invalid block number.
As a result, we patched FN2PTCCHBLOCK calculation according TS 45.0002 Table 6.
Change-Id: I8be1c8b9159c94788857c6de5440a418739f1212
Instead of handling primitives directly at layer 1 specific code,
osmo-bts handles primitives at common code.
When all primitive are moved, the l1sap interface will:
- receive PH-DATA indications and forward them to layer 2.
- check for RF link loss and notify BSC.
- receive TCH indications and forward them via RTP.
- receive PH-RTS indications and send PH-DATA requests with content
according to its logical channel.
- receive TCH-RTS indications and send TCH requests with content
received via RTP or loopback from TCH indications.
- send MPH-INFO requests to activate, deactivate and modify logical
channels and handle their confirms.
- receive MPH-INFO indications with measurements from tranceiver.
- forward received and transmitted PH-DATA to GSMTAP.
Andreas Eversberg
Andreas Eversberg
Harald Welte
Pau Espin
Vadim Yanitskiy
Philipp Maier
Oliver Smith