OpenBTS: Database SQLite

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OpenBTS P2.8 menggunakan file database sqlite untuk mengkonfigurasi maupun membuat informasi status tersedia untuk aplikasi external. Sqlite adalah sebuah database SQL yang serverless, self-contained awalnya di kembangkan untuk peluru kendali (guided missile) dan sekarang banyak digunakan untuk banyak aplikasi, termasuk Blackberry, Symbian, iOS dan sistem operasi Android operating systems. Untuk informasi lebih lanjut tentang sqlite dapat dilihat di situs http://www.sqlite.org

Mengedit database di Sqlite3

Ada beberapa metoda yang dapat digunakan untuk mengedit dan melihat file database sqlite3 OpenBTS sqlite3, yaitu,

  • Sqlite3 tool command line. Access Point Range Network membawa serta sqlite3 tool command line yang dapat digunakan untuk melihat dan memodifikasi database yang ada menggunakan sintaks SQL.
    • database dapat dimanipulasi secara langsung menggunakan sintaks SQL secara realtime.
    • Untuk editing secara offline, sqlite3 dapat mengexport kode SQL ke text file menggunakan ".dump". Setelah di edit, dapat di import kembali menggunakan ".read".
  • Menggunakan editor database pihak lain. Ada beberapa GUI database editor yang tersedia untuk file database sqlite3, contoh:
    • “SQLite Database Browser” – Free browser untuk OS X & Linux tersedia dari sourceforge.net.
    • “RazorSQL” – database GUI komersial tersedia dari razorsql.com.
    • Firefox – Mozilla menawarkan add-on Firefox gratis yang di namakan SQLite Manager yang memungkinkan Firefox web browser untuk digunakan untuk melihat dan mengedit database sqlite3, tersedia dari addons.mozilla.org.
  • Melalui OpenBTS sendiri. Perintah OpenBTS CLI "config" dan "unconfig" dapat digunakan untuk mengedit tabel konfigurasi secara realtime. Perubahan konfigurasi melalui CLI akan di tulis ke database OpenBTS.db dan akan persistent.

Tabel Konfigurasi

Parameter yang mengontrol aplikasi OpenBTS di simpan dalam tabel database yang di sebut configuration table. Beberapa parameter ada yang dynamic, artinya jika parameter tersebut di ubah maka akan menimbulkan effek secara langsung. Beberapa parameter lainnya sifatnya statik dan perubahan pada parameter ini tidak akan menimbulkan effek sampai OpenBTS di restart. Beberapa parameter ada yang sifatnya statik dan match ke hardware yang spesifik dan sebaiknya tidak diubah sama sekali. Comment dalam database konfigurasi menjelaskan setiap parameter dan untuk kondisi apa parameter tersebut bisa di ubah. Flag dalam database schema menunjukan parameter mana yang statik. Schema untuk tabel konfigurasi di P2.8 adalah: 

CREATE TABLE CONFIG (
  KEYSTRING TEXT UNIQUE NOT NULL,
  VALUESTRING TEXT,
  STATIC INTEGER DEFAULT 0,
  OPTIONAL INTEGER DEFAULT 0,
  COMMENTS TEXT DEFAULT ’’
  )

Perhatian bahwa database itu sendiri berisi comment, tersedia untuk operator setiap waktu. Comment ini akan dijelaskan lebih lanjut di manual ini.

Untuk mengubah sebuah parameter konfigurasi yang dynamic secara real time, kita dapat mengedit tabel menggunakan cara yang di jelaskan di atas. Effek yang terjadi akan langsung di rasakan, walaupun transaksi yang sedang berjalan akan tetap menggunakan parameter yang diset waktu memulai transaksi. Contoh, perubahaan pada parameter SIP.Proxy.Speech tidak akan memberikan effek ke sambungan telepon yang sedang in-progress, tapi call yang baru akan menggunakan proxy yang baru.

Untuk mengubah parameter konfigurasi statik, edit tabel menggunakan salah satu metoda yang di jelaskan di atas kemudian restart aplikasi OpenBTS. Dalam Linux embedded system yang standard, restart ini dapat di peroleh dengan perintah "exit", atau dengan cara me-reboot BTS tersebut.

Dalam beberapa kasus, NULL adalah nilai yang valid untuk sebuha parameter konfigurasi. Dalam terminologi SQL, nilai NULL adalah sebuah tag khusus yang menunjukan bahwa nilai tersebut tidak terdefinisi.Ini tidak sama dengan sebuah string "NULL", yang merupakan sebuah string yang berisi "NULL". Untuk membuat nilai NULL dari CLI, gunaan perintah "unconfig".

Daftar Parameter konfigurasi secara umum terlampir di bawaj ini, beberapa parameter yang penting akan di jelaskan di bagian yang lain,

  • CLI.Prompt – Prompt for the OpenBTS command line interface.
  • Control.Emergency.Destination.Host – SIP destination host to be used for the ”To:” header of emergency calls. This host may be different from the address given for SIP.Proxy.Emergency.
  • Control.Emergency.Destination.User – SIP destination user or extension to be used for the ”To:” header of emegency calls. IMS specifies ”sos”, but correct value must be matched to your switch configuration and PSAP interface.
  • Control.Emergency.GatewaySwitch – Gateway SIP switch for inbound calls from other networks. This host is used to form the return path for emergency calls, so it should be a host address that will route from your serving PSAP.
  • Control.Emergency.Geolocation – If defined, send this location as an RFC-4119 XML GEOPRIV object during SIP emergency call establishment. Format is dd:mm:ss[NS] ddd:dd:dd[EW].
  • Control.Emergency.QueueTime – Maximum time to wait for a channel to open up for an emegency call in a congested system, in milliseconds.
  • Control.Emergency.RFC5031 – If not NULL, use the RFC-5031 URN sip:sos@SIP.Proxy.Emergency as the request URN for outbound emergency calls over SIP, regardless of the value of Emergency.Destination.User. The ”To:” header will still be Emergency.Destination.User@Emergency.Destination.Host.
  • Control.Emergency.Source.User – SIP identity to use if no IMSI is available. IMS specifies ”anonymous” but other values might be more useful depending on your configuration.
  • Control.GSMTAP.TargetIP – Target IP address for GSMTAP packets; the IP address of Wireshark, if you use it for GSM.
  • Control.LUR.AttachDetach – Attach/detach flag. Set to 1 to use attach/detach procedure, 0 otherwise. This will make initial LUR more prompt. It will also cause an un-regstration if the handset powers off and really heavy LUR loads in areas with spotty coverage.
  • Control.LUR.CachedAuthentication – If not NULL, use RAND-SRES pairs cached in the TMSI table for authentication. If this method is used, it is important that the TMSI Table be in persistent storage.
  • Control.LUR.DefaultAuthenticationAccept – If not NULL, provisioned handsets will be accepted for authentication in the absence of any defined authentication method. For commercial networks this value should probably be NULL.
  • Control.LUR.FailedRegistration.Message – If defined, send this text message, followed by the IMSI, to unprovisioned handsets that are denied registration.
  • Control.LUR.FailedRegistration.ShortCode – The return address for the failed registration message. If the message is defined, this must also be defined.
  • Control.LUR.NormalRegistration.Message – If defined, send this text message, followed by the IMSI, to provisioned handsets when they attach on Um.
  • Control.LUR.NormalRegistration.ShortCode – The return address for the normal registration message. If the message is defined, this must also be defined.
  • Control.LUR.OpenRegistration – A regular expression. If not NULL, allow unprovisioned handsets with matching IMSIs to attach in Um.
  • Control.LUR.OpenRegistration.Message – If defined, send this text message, followed by the IMSI, to unprovisioned handsets when they attach on Um due to open registration.
  • Control.LUR.OpenRegistration.ShortCode – The return address for the open registration message. If the message is defined, this must also be defined.
  • Control.LUR.QueryClassmark – If not NULL, query every MS for classmark during LUR.
  • Control.LUR.QueryIMEI – If not NULL, query every MS for IMSI during LUR.
  • Control.LUR.SR-HTTPAuthentication – If not NULL, use the HTTP interface of the subscriber registry server for authentication.
  • Control.LUR.SendTMSIs – If not NULL, send new TMSI assignments to handsets that are allowed to attach.
  • Control.LUR.UnprovisionedRejectCause – Reject cause for location updating failures for unprovisioned phones. Reject causes come from GSM 04.08 10.5.3.6. Reject cause 0x04, IMSI not in VLR, is usually the right one.
  • Control.NumSQLTries – Number of times to retry SQL queries before declaring a database access failure.
  • Control.Reporting.PhysStatusTable – File path for channel status reporting database. Static.
  • Control.Reporting.TMSITable – File path for TMSITable database. Static.
  • Control.TMSITable.MaxAge – Maximum allowed age for a TMSI in hours.
  • Control.TMSITable.MaxSize – Maximum size of TMSI table before oldest TMSIs are discarded.
  • Control.TestCall.Port – Port for exchanging L3 packets with the testcall feature.
  • Control.VEA – If not NULL, user very early assignment for speech call establishment. See GSM 04.08 Section 7.3.2 for a detailed explanation of assignment types. If VEA is selection, GSM.CellSelection.NECI should be set to 1. See GSM 04.08 Sections 9.1.8 and 10.5.2.4 for an explanation of the NECI bit.
  • GSM.CCCH.AGCH.QMax – Maximum number of access grants to be queued for transmission on AGCH before declaring congrestion.
  • GSM.CCCH.CCCH-CONF – CCCH configuration type. See GSM 10.5.2.11 for encoding. Value of 1 means we are using a C-V beacon. Any other value selects a C-IV beacon.
  • GSM.CCCH.PCH.Reserve – Number of CCCH subchannels to reserve for paging.
  • GSM.CellSelection.CELL-RESELECT-HYSTERESIS – Cell Reselection Hysteresis. See GSM 04.08 10.5.2.4, Table 10.5.23 for encoding. Encoding is 2N dB, values of N are 0...7 for 0...14 dB.
  • GSM.CellSelection.MS-TXPWR-MAX-CCH – Cell selection parameters. See GSM 04.08 10.5.2.4.
  • GSM.CellSelection.NCCsPermitted – NCCs Permitted. An 8-bit mask of allowed NCCs. Unless you are coordinating with another carrier, this should probably just select your own NCC.
  • GSM.CellSelection.NECI – NECI, New Establishment Causes. This must be set to ”1” if you want to support very early assignment. See GSM 04.08 10.5.2.4, Table 10.5.23 and 04.08 9.1.8, Table 9.9.
  • GSM.CellSelection.Neighbors – ARFCNs of neighboring cells.
  • GSM.CellSelection.RXLEV-ACCESS-MIN – Cell selection parameters. See GSM 04.08 10.5.2.4.
  • GSM.Channels.C1sFirst – If not NULL, allocate C-I slots first, starting at C0T1. Otherwise, allocate C-VII slots first. Static.
  • GSM.Channels.NumC1s – Number of Combination-I timeslots to configure. The C-I slot carries a single full-rate TCH, used for speech calling. Static.
  • GSM.Channels.NumC7s – Number of Combination-VII timeslots to configure. The C-VII slot carries 8 SDCCHs, useful to handle high registration loads or SMS. If C0T0 is C-IV, you must have at least one C-VII also. Static.
  • GSM.Identity.BSIC.BCC – GSM basestation color code; lower 3 bits of the BSIC. BCC values in a multi-BTS network should be assigned so that BTS units with overlapping coverage do not share a BCC. This value will also select the training sequence used for all slots on this unit.
  • GSM.Identity.BSIC.NCC – GSM network color code; upper 3 bits of the BSIC. Assigned by your national regulator. Must be distinct from NCCs of other GSM operators in your area.
  • GSM.Identity.CI – Cell ID, 16 bits. Should be unique.
  • GSM.Identity.LAC – Location area code, 16 bits, values 0xFFxx are reserved. For multi-BTS networks, assign a unique LAC to each BTS unit. (That is not the normal procedure in conventional GSM networks, but is the correct procedure in OpenBTS networks.)
  • GSM.Identity.MCC – Mobile country code, 2 or 3 digits. Defined in ITU-T E.212.
  • GSM.Identity.MNC – Mobile network code; Must be 3 dgits. Assigned by your national regulator.
  • GSM.Identity.ShortName – Network short name, displayed on some phones. Optional but must be defined if you also want the network to send time-of-day.
  • GSM.Identity.ShowCountry – If not NULL, tell the phone to show the country name based on the MCC.
  • GSM.MS.Power.Damping – Damping value for MS power control loop.
  • GSM.MS.Power.Max – Maximum commanded MS power level in dBm.
  • GSM.MS.Power.Min – Minimum commanded MS power level in dBm.
  • GSM.MS.TA.Damping – Damping value for timing advance control loop.
  • GSM.MS.TA.Max – Maximum allowed timing advance in symbol periods. Ignore RACH bursts with delays greater than this. Can be used to limit service range.
  • GSM.MaxSpeechLatency – Maximum allowed speech buffering latency, in 20 ms frames. If the jitter is larger than this delay, frames will be lost.
  • GSM.RACH.AC – Access class flags. This is the raw parameter sent on the BCCH. See GSM 04.08 10.5.2.29 for encoding. Set to 0 to allow full access. If you do not have proper PSAP integration, set to 0x0400 to indicate no support for emergency calls.
  • GSM.RACH.MaxRetrans – Maximum RACH retransmission attempts. This is the raw parameter sent on the BCCH. See GSM 04.08 10.5.2.29 for encoding.
  • GSM.RACH.TxInteger – Parameter to spread RACH busts over time. This is the raw parameter sent on the BCCH. See GSM 04.08 10.5.2.29 for encoding.
  • GSM.RADIO-LINK-TIMEOUT – L1 radio link timeout. This is the raw parameter sent on the BCCH; see GSM 10.5.2.3 for encoding. Should be coordinated with T3109.
  • GSM.RRLP.ACCURACY – Requested accuracy of location request. K in 10(1.1**K-1). See 3GPP 03.32, sect 6.2
  • GSM.RRLP.ALMANAC.REFRESH.TIME – How often the almanac is refreshed, in hours
  • GSM.RRLP.ALMANAC.URL – URL of almanac source.
  • GSM.RRLP.EPHEMERIS.REFRESH.TIME – How often the ephemeris is refreshed, in hours.
  • GSM.RRLP.EPHEMERIS.URL – URL of ephemeris source.
  • GSM.RRLP.RESPONSETIME – Mobile timeout. (OpenBTS timeout is 130 sec = max response time + 2.) N in 2**N. See 3GPP 04.31 sect A.2.2.1
  • GSM.RRLP.SEED.ALTITUDE – Seed altitude in meters wrt geoidal surface.
  • GSM.RRLP.SEED.LATITUDE – Seed latitude in degrees. -90 (south pole) .. +90 (north pole)
  • GSM.RRLP.SEED.LONGITUDE – Seed longitude in degrees. -180 (west of greenwich) .. 180 (east)
  • GSM.RRLP.SERVER.URL – URL of RRLP server.
  • GSM.Radio.Band – The GSM operating band. Valid values are 850 (GSM850), 900 (PGSM900), 1800 (DCS1800) and 1900 (PCS1900). For most Range models, this value is dictated by the hardware and should not be changed. Static.
  • GSM.Radio.C0 – The C0 ARFCN. Static.
  • GSM.Radio.MaxExpectedDelaySpread – Expected worst-case delay spread in symbol periods, roughly 3.7 us or 1.1 km per unit.
  • GSM.Radio.PowerManager.MaxAttenDB – Maximum transmitter attenuation level, in dB wrt full scale on the D/A output. This sets the minimum power output level in the output power control loop.
  • GSM.Radio.PowerManager.MinAttenDB – Minimum transmitter attenuation level, in dB wrt full scale on the D/A output. This sets the maximum power output level in the output power control loop.
  • GSM.Radio.PowerManager.NumSamples – Number of samples averaged by the output power control loop.
  • GSM.Radio.PowerManager.SamplePeriod – Sample period for the output power control loop.
  • GSM.Radio.PowerManager.TargetT3122 – Target value for T3122, the random access hold-off timer, for the power control loop.
  • GSM.Radio.RSSITarget – Target uplink RSSI for MS power control loop, in dB wrt to A/D full scale. Should be 6-10 dB above the noise floor.
  • GSM.Radio.RxGain – Receiver gain setting in dB. Ideal value is dictacted by the hardware. This database parameter is static but the receiver gain can be modified in real time with the CLI rxgain command. Static.
  • GSM.Timer.T3113 – Paging timer T3113 in ms. This is the timeout for a handset to respond to a paging request. This should usually be the same as SIP.Timer.B in your VoIP network.
  • GSM.Timer.T3122Max – Maximum allowed value for T3122, the RACH holdoff timer, in milliseconds.
  • GSM.Timer.T3122Min – Minimum allowed value for T3122, the RACH holdoff timer, in milliseconds.
  • GSM.Timer.T3212 – Registration timer T3212 period in minutes. Should be a factor of 6. Set to 0 to disable periodic registration. Should be smaller than SIP registration period.
  • Log.Alarms.Max – Maximum number of alarms to remember inside the application.
  • Log.Level – Default logging level when no other level is defined for a file.
  • Log.Level.CallControl.cpp – Default configuration logs a trace at L3.
  • Log.Level.MobilityManagement.cpp – Default configuration logs a trace at L3.
  • Log.Level.RadioResource.cpp – Default configuration logs a trace at L3.
  • Log.Level.SMSControl.cpp – Default configuration logs a trace at L3.
  • NTP.Server – NTP server(s) for time-of-day clock syncing. For multiple servers, use a space-delimited list. If left undefined, NTP will not be used, but it is strongly recommended.
  • RTP.Range – Range of RTP port pool. Pool is RTP.Start to RTP.Range-1. Static.
  • RTP.Start – Base of RTP port pool. Pool is RTP.Start to RTP.Range-1. Static.
  • SIP.DTMF.RFC2833 – If not NULL, use RFC-2833 (RTP event signalling) for in-call DTMF.
  • SIP.DTMF.RFC2833.PayloadType – Payload type to use for RFC-2833 telephone event packets. If SIP.DTMF.2833 is defined, this must also be defined.
  • SIP.DTMF.RFC2967 – If not NULL, use RFC-2967 (SIP INFO method) for in-call DTMF.
  • SIP.Local.IP – IP address of the OpenBTS machine as seen by its proxies. If these are all local, this can be localhost. Static.
  • SIP.Local.Port – IP port that OpenBTS uses for its SIP interface. Static.
  • SIP.MaxForwards – Maximum allowed number of referrals.
  • SIP.Proxy.Emergency – The IP host and port of the proxy to be used for emergency calls.
  • SIP.Proxy.Registration – The IP host and port of the proxy to be used for registration and authentication. This is the subscriber registry, for example.
  • SIP.Proxy.SMS – The IP host and port of the proxy to be used for text messaging. This is smqueue,for example.
  • SIP.Proxy.Speech – The IP host and port of the proxy to be used for normal speech calls. This is Asterisk, for example.
  • SIP.RegistrationPeriod – Registration period in minutes for MS SIP users. Should be longer than GSM T3212.
  • SIP.SMSC – The SMSC handler in smqueue. This is the entity that handles full 3GPP MIME-encapsulted TPDUs. If not defined, use direct numeric addressing. Normally the value is NULL if SMS.MIMIEType is ”text/plain” or ”smsc” if SMS.MIMEType is ”application/vnd.3gpp”.
  • SIP.Timer.A – INVITE retransmit period in ms.
  • SIP.Timer.B – INVITE transaction timeout in ms. This value should usually match GSM.Timer.T3113.
  • SIP.Timer.E – Non-INVITE initial request retransmit period in ms.
  • SIP.Timer.F – Non-INVITE initial request timeout in ms.
  • SIP.Timer.H – ACK timeout period in ms.
  • SIP.Timer.I – ACK retransmit period in ms.
  • SIP.Timer.J – Non-INVITE non-initial request retransmit period in ms.
  • SIP.myPort – Port used by the SIP Authentication Server
  • SMS.DefaultDestSMSC – Use this to fill in L4 SMSC address in SMS submission.
  • SMS.FakeSrcSMSC – Use this to fill in L4 SMSC address in SMS delivery.
  • SMS.MIMEType – This is the MIME Type that OpenBTS will use for RFC-3428 SIP MESSAGE payloads. Valid values are ”application/vnd.3gpp.sms” and ”text/plain”.
  • SubscriberRegistry.A3A8 – URL of upstream subscriber registry server. Blank (not NULL) if there is none.
  • SubscriberRegistry.HTTP.Server – URL of the subscriber registry server.
  • SubscriberRegistry.Manager.Title – Title of subscriber registry database manager web page.
  • SubscriberRegistry.Manager.Url – URL of the subscriber registry database manager.
  • SubscriberRegistry.Manager.VisibleColumns – Field names in subscriber registry visible in the database manager.
  • SubscriberRegistry.db – The location of the sqlite3 database holding the subscriber registry.
  • TRX.IP – IP address of the transceiver application. Static.
  • TRX.Port – IP port of the transceiver application. Static.
  • TRX.RadioFrequencyOffset – Fine-tuning adjustment for the transceiver. Static.

TMSI Table

Untuk mengurangi ketergantungan ke sambungan backhaul, OpenBTS men-track TMSI secara internal. Untuk memenuhi hal ini, OpenBTS men-track hubungan TMSI-IMSI menggunakan sqlite3 dalam tabel TMSI.TMSI dimasukan menggunakan nomor urut. OpenBTS mengalokasikan TMSI di tabel TMSI untuk setiap MS yang mengirimkan Location Updating Request, baik MS yang di ijinkan untuk register maupun tidak. Tabel TMSI akan dapat di read-write oleh OpenBTS tapi hanya read-only oleh aplikasi lain. Path dari file database yang digunakan di tabel is di definisikan di parameter konfigurasi Control.DBPath.TMSITable. Di system. tabel di simpan di partisi ramdisk biasanya standard lokasi-nya di /var/run. Schema TMSI tabel adalah: 

CREATE TABLE IF NOT EXISTS TMSI_TABLE (
  TMSI INTEGER PRIMARY KEY AUTOINCREMENT -- this value is used as the TMSI
  CREATED INTEGER NOT NULL, -- Unix time of record creation
  ACCESSED INTEGER NOT NULL, -- Unix time of last encounter
  IMSI TEXT UNIQUE NOT NULL, -- IMSI of the SIM
  IMEI TEXT, -- IMEI of the MS, if requested
  L3TI INTEGER DEFAULT 0, -- L3 transaction identifier last used with this MS
  A5_SUPPORT INTEGER, -- encryption support in the MS, if requested
  POWER_CLASS INTEGER, -- power class of the MS. if requested
  OLD_TMSI INTEGER, -- previous TMSI from another cell or network
  PREV_MCC INTEGER, -- previous network MCC
  PREV_MNC INTEGER, -- previous network MNC
  PREV_LAC INTEGER, -- previous network LAC
  RANDUPPER INTEGER -- cached authentication token
  RANDLOWER INTEGER -- cached authentication token
  SRES INTEGER, -- cached authentication token
  DEG_LAT FLOAT, -- cached RRLP result
  DEG_LONG FLOAT -- cached RRLP result
  )

Channel Table

OpenBTS melaporkan secara real time informasi status fisik untuk kanal yang aktif ke tabel sqlite3 external bernama PHYSTATUS. Tabel ini dilihat sebagai write-only oleh OpenBTS tapi harus dilihat sebagai read-only oleh aplikasi lainnya. Data dari channel ini akan di update setiap ada message sistem infomasi yang di terima untuk berasosiasi ke channel SACCH. Path dari file database yang digunakan di tabel ini di definisikan di parameter konfigurasi GSM.DBPath.PhysStatusTable. Schema tabel adalah: 

CREATE TABLE IF NOT EXISTS PHYSTATUS (
  CN_TN_TYPE_AND_OFFSET STRING PRIMARY KEY, -- cross-refs TRANSACTION_TABLE
  ARFCN INTEGER DEFAULT NULL, -- actual ARFCN
  ACCESSED INTEGER DEFAULT 0, -- Unix time of last update
  RXLEV_FULL_SERVING_CELL INTEGER DEFAULT NULL, -- from most recent measurement report
  RXLEV_SUB_SERVING_CELL INTEGER DEFAULT NULL, -- from most recent measurement report
  RXQUAL_FULL_SERVING_CELL_BER FLOAT DEFAULT NULL, -- from most recent measurement report
  RXQUAL_SUB_SERVING_CELL_BER FLOAT DEFAULT NULL, -- from most recent measurement report
  RSSI FLOAT DEFAULT NULL, -- RSSI relative to full scale input
  TIME_ERR FLOAT DEFAULT NULL, -- timing advance error in symbol periods
  TRANS_PWR INTEGER DEFAULT NULL, -- MS tx power in dBm
  TIME_ADVC INTEGER DEFAULT NULL, -- MS timing advance in symbol periods
  FER FLOAT DEFAULT NULL -- uplink FER
  )

Field CN TN TYPE AND OFFSET adalah string yang menerangkan sebuah channel dalam bentuk C<n>T<n> <channelType>-<subchannelIndex>

TABEL CHANNEL

Contoh

  • “C0T1 TCH/F” is a full rate traffic channel on timeslot 1 of the C0 ARFCN
  • “C0T0 SDCCH-0/4” is the #0 SDCCH (of 4 available) on C0T0.

String dengan format yang sama digunakan di tabel transaction.

Pranala Menarik

Persiapan

OpenBTS 2.6

OpenBTS 2.8

Multi OpenBTS 2.8

Ettus E110

GPRS

Power Amplifier

Lain Lain

Catatan Legal dan Pendukung

Catatan Sejarah

Dokumentasi Video

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