MICRO-B BTS System Description @ so-o0s-syazto Copyright © 1999 LOGIC All Rights Reserved Printed in Korea
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se 0 « System Description Micro-B BTS 1. General 1.1 Overview Micro-B BTS (hereinafter called M-BTS), located between MS and BSC, a private communication system using COMA digital mobile communication technology, controls calls and performs the maintenance function for MS. That is, it leads MS to initially recognize BTS, downloads necessary data, assigns traffic channel as to call request, and opens call Path. M-TBS is divided largely into MB and BRR and accommodates all the functions below.
System Description 1.2 General Specification Micro-B BTS M-TBS Types = 1FA/3 Sector(Base) = Up to 2FA/3 Sector(Extended) Traffic Channels Capacity per Sector More than 13Chs/Sector/FA = 13K CELL Coder Traffic Handling Capacity per Sector More than 9.0 Erlang/Sector/FA + BP=2% No.
System Description Micro-B BIS 2. Architecture 2.1 Hardware Configuration 2.1.1 MB (Micro-B BTS Main Rack) MB consists of CC-C, MAPS, MM], rectifier, environment sensor, battery. HE H/E FAN RAIN [Fle Ta hula va [nls Slelalelelce]ululu] PoiDIDIGG]G v ws |/lafalalalalajafala < 5 L BLANK BLANK AC-M POM Ac Um POM 2.1.1.1 CC-B (Micro-B BTS Control & Channel Bank Block — B) CC-B block performs Downloading, call control, and maintenance functions of BTS.
System Description Micro-B BTS 2.1.1.2 MAPS (Micro-B Bass Global Positioning System) MAPS block is composed of BATMAN which provides synchronization with BTS system and CLOCK, using TOD and synchronous signal provided from GPS receiver and MAPS composed of GPS engine, Power supply, COCCYX, and Controller. BATMAN receives 10MHZ(sine wave), IPPS(TTL) and TOD(Time of Day) from MAPS, and TOD uses IPC link in BTS to perform Broadcasting.
System Description Micro-B BTS 2.1.1.6 Battery Upon a commercial power failure it supplies power to the system, and 30 minute system Back up is enabled. 2.1.2 BRR (Micro-B BTS Remote Rack) BRR is comprised of MICA, MFUME-B, PA CA-EB, Bias Tee, DC/DC Booster, DC/DC Converter, and LAUNCHPAD. BRR Insertion Diagram HAUNT.
System Description Micro-B BTS (I)MRCA : Controls a device in BRR. (2) Bias Tee: Combines and separates power and RF Tx/Rx signal. (3) Duplexes: Combines and separates Tx/Rx signal. (4) LAUNCHPAD: Performs the amplification function necessary for the output of Nominal RF Power of Tx signal. (5) MFUME-B: Amplifies 1FA BPF and two Rx path signal, and detects and separates Tx signal. (6) PA CA-EB : Detects and reports Tx signal.
System Description Micro-B BTS 3. Functions 3.1 Main functions of BTS The main functions of BTS subsystem are as follows: 1) Call control function It inter works with MS and BSC to perform the function that sets up and releases Mobile-to Land, Land-to-Mobile, and Mobile-to-Mobile calls entered into BTS, and nonsupport Softer, Soft, Hard hand off functions. In addition, it performs Markov call processing function for setting up of test calls.
Systems Description Micro-B BTS 7) Overload control function It is divided into four grades (Normal, Minor, Major, and Critical) according to the load of the processor, and it takes necessary measures such as origination barring, termination/origination barring, ete. according to the corresponding grade.
Systems Description Micro-B BTS 3.2 Hardware Configuration and Function 3.2.1 Hardware Configuration Diagram Micro-B BTS MB BRR i CC-B MAPS MIMI MICA Bimodal PACEY {maps | PAUNCH CRAP MENU MCCARTHY 3.2.2 Function of Each Hardware Unit 3.2.2.1 MB 3.2.2.1.
System Description Micro-B BTS Node function, M-Bus interface function, etc. and MM-P function consisting of Network Master function, Trunk interface function, Packet Bus Slave Node function, M-Bus interface function.
System Description Micro-B BTS * BSM access through User I/F (PST) Modem Busywork Station or PC) can access BTS BAA through PST, and BSM can check the BTS status, perform Remote Control and diagnose the Boards in BTS. Modem’s Protocol is V.90, and its transmission speed is up to 56Kbps. » BTS Maintenance( by Maintenance Bus, EDU Communication) BAA is Master of the Maintenance Bus, and through this it checks the status of each board in BTS and manages it.
System Description Micro-B BTS SDM — Self states Detecting Module (Open/Fail) PIM Packet Interface with CPA STM — System Timing HPA — SIO HPA Interface SIM ~ BUDS, PACEY Interface (4) MCPA20 (Multi-Channel Processing board Assembly 20) MCPA20 is a Board in charge Traffic Channels with Overhead channel (Pilot, Sync, Paging, Access channel) of COMA code channels, and MCPA20 has Core Control Module (CCM) interfacing with CPU(1960), and is composed of ES CC in charge of Monitor Interface through RS-232, Memory
System Description Micro-B BTS (5) BUDS (Base station sector conversion & Up/Down converter Assembly) BUDS is largely divided into the common part, Tx Path, and Rx Path. Bud's Block Diagram and the major functions are as follows: + Major functions in Tx/Rx Frequency UP Conversion function which changes Base band signal into IF/ RF signal. RF signal output adjustment function by Gain Control.
System Description Micro-B BTS 3.22.12 MAPS 1) BATMAN (BTS Timing Management circuit board assembly) BATMAN receives 10MHZ(TTL), 1PPS(TTL) and TOD (Time of Day) from MAPS, and TOD uses [PC link in BTS for Broadcasting. BATMAN is operated duplex, and the signals between MAPS and BATMAN are all connected through Back plane, and BATMAN uses On-board power supply.
System Description Micro-B BTS The main functions are as follows: MHz, APPS, TOD Generation function Control port, Alarm Interface function Redundancy Control function Fault monitoring function se 3.2.2.1.3 MIMI (Micro-B Master Interface Unit) MIMI amplifies Tx output of the BUDS Board by Sector, and it uses manual Attenuation to adjust the gain of the Tx Path in consideration of path loss to the extent of Remote.
System Description Micro-B BTS ACU consists of three parts as below. + Sensor part ~ Each Sensor is located inside of the housing to sense the environmental status through the Sensor, and upon a failure, it goes off alarms, and transmits the environment alarm to the higher end (BAA) at TTL Level. + Alarm detection part ~ ACU is connected with the external Unit (FAN, RECTIFIER, TC, and upon a failure occurrence of the Unit it collects Alarm to transmit it to the higher end.
System Description Micro-B BTS 3.2.2.2 BRR (1) MICA (Micro-B BTS Remote Controller Assembly) MICA is a board in charge of Alarm status Report and Module Control of the remote system, and it uses control signal from CRAP of BTS to control each module, and performs the function of notifying CRAP of BTS of the state of Alarm and Status.
System Description Micro-B BTS » Module EXIST signal generation function To notify MICA of whether there exists each module in MARC, Exist Signal is connected between MICA and each module, and this signal is connected to the Ground in each module, and in MICA it is connected with the pull-up resistance, MICA hereby judges whether there exist alarms of gate module. * Analog to Digital (A/D) converter It receives the power transmitted from HPA with Rx rate and measures TX power fo report it to CRAP.
System Description Micro-B BTS (6) Adjust & Control Assembly) PA CA-EB PBA receives an input of signals given Tx output COUPLING from TRIO and converts its frequency to acquire IF signal, and then separates measurement target FA signal only through the SAW FILTER to convert it into DC volt in proportion to Tx output, and finally supplies it to MICA, a PROCESSOR BOARD. Its path has only one RF PATH, and it can tune 7 FAs by the frequency signal controlled by MICA.
System Description Micro-B BTS 3.
System Description Micro-B BTS 4.
BTS Description Micro-B BTS Stand Alone Mode This document describes the configuration method of Stand Alone Mode of MICRO-B BTS and Test Call Setup method on Stand Alone Mode. Lu OVERVIEW J 2. Abbreviation mess mo 3. Stand Alone Test Configuration . 3.1 Application/OS Loading 3.2 PLD Loading Procedure i 3.3 Overhead Channel Unblock (Procedure. 4. Stand Alone Test Function roses 4.1 No CCP Mode... oe 4.2 Stand Alone Mode B BTS Call. 4.3 Null Traffic Test Call @ supernova Page: 1(9) Issue: 1.
BTS Description Micro-B BIS Stand Alone Mode 1. Overview Stand “Alone Mode of MICRO-B BTS is the function which made a restricted test call possible by completing Loading and initialization by BTS itself in case there is no BTS higher processor (CCP, BS. S/W necessary for the operation of BTS includes Application, OS, and PLD, ete. by processor in BTS, and these S/W are stored in CCP and BSM, BTS higher processor, and are programs downloaded and run by the Loading request of BTS.
