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When DL DTX is active and silent period is in progress dtx.cache is populated by SID UPDATE message which about to be scheduled next. If at that moment FACCH message arrives (which have higher priority) we have to send ONSET message to L1 but we can't invalidate cache with SID UPDATE as it will be used for SID FIRST message to resume silent period after FACCH transmission is over (provided there were no incoming voice in between). Hence the necessity for separate buffer to store content of FACCH message while we're sending ONSET to L1 while keeping SID UPDATE cached. Change-Id: I316e81af893b24766bf259baaed7a0be75a11694 Related: OS#1801
About OpenBSC ============= OpenBSC started as a minimalistic all-in-one implementation of the GSM Network, with particular emphasis on the functionality typically provided by the BSC, MSC, HLR, VLR and SMSC. Today it is a growing suite of libraries and programs, implementing protocol stacks and functional elements, including * OsmoBSC - a pure GSM BSC, speaking Abis/IP to the BTS and A/IP to the MSC * OsmoBSC-MGCP - MGCP helper to the OsmoBSC software * OsmoNITB - a BSC+MSC+VLR+HLR+SMSC "Network in the box". * OsmoCSCN - a voice CN with A/IP and IuCS/IP towards the BSC and/or HNB-GW * OsmoSGSN - a GPRS SGSN with Gb/IP and IuPS/IP towards the PCU and/or HNB-GW * Osmo-GbProxy - a Proxy to aggregate many Gb links as one Gb link to the SGSN * OsmoBSCNAT - a gateway aggregating many A links as one A link to the MSC * OsmoGTPHUB - a hub aggregating many GTP links (between SGSN and GGSN) * ipaccess-utils - some tools to discover + configure ip.access nanoBTS * bs11_config - a tool to configure the Siemens BS-11 microBTS Various interfaces towards the BTS are supported, among which are: * Classic A-bis over E1 using a mISDN based E1 interface. In other words, you can connect existing GSM Base Transceiver Station (BTS) through E1 to OpenBSC. So far, we have made it work with the Siemens BS-11, various Ericsson RBS2xxx BTS models and the Nokia MetroSite. * A-bis over IP as used by the ip.access nanoBTS product family as well as the Open Source OsmoBTS software (by the same authors as OpenBSC). OsmoBTS in turn supports various transceiver hardware, including the sysmoBTS product family, as well as SDR transceivers supported by OsmoTRX, such as the UmTRX or USRP boardss. * IuCS and IuPS over IP towards an HNB-GW (see osmo-iuh) for UMTS (3G) voice and data links. Find OpenBSC online at http://openbsc.osmocom.org/ Harald Welte <laforge@gnumonks.org>