DMR Digital Mobile Radio - Romkatel

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2 DMR is the new European standard for the market introduction of a new digital PMR-System for the RF-frequency bands 4; 2 and 0.7 metres. The target groups for DMR-systems are those enterprises with higher grade of service demands for PMR-radio transmissions (e.g. energy providers, public transportation companies, railway companies, security services, freight forwarding companies, emergency- and rescue services, and fire brigades) as well as other industries and authorities that do not see the need to purchase a cost intensive trunking radio system, such as TETRA or TETRAPOL. DMR is a practical digital technology for private mobile radio purposes. Therefore, from the user’s point of view it is an excellent alternative solution when it comes to the decision of whether to go, in future, for the usage of public mobile network resources (e.g. GSM-ASCI) in order to provide PMR-features (no ownership of the network) or to opt for the installation and operation of an own complete new trunking radio system. 1 2 3 4 5 6 7 8 DMR - Air Interface Direct-Mode between the terminal equipment User Interface Peripheral Interface Operator Gateway Interface External terminal equipment Network-Monitoring and Configuration Interface Net infrastructure DMR DMR The new Generation of Professional Mobile Radio Funkwerk is an extensively experienced system provider for wireless and fixed line communication platforms. Funkwerk, therefore, is truly aware of the customer’s needs. At a reasonable cost level, DMR makes it possible to launch additional new network features throughout a smooth system migration phase from the existing analogue radio environment to the new digital era with better transmission quality and higher transmission capacity. DMR allows the usage of the same radio frequency band for radio communications as previously used for the old analogue network. This means that no new radio network planning is required since no new (other and/or additional) sites for base stations are needed. All such related additional infrastructure costs are often underrated for system migrations from one technology to another. These costs can be eliminated with DMR. In order to meet this level of modern voice- and data communications for a smooth system migration approach, Funkwerk will provide equipment that includes two technologies; on the one hand, the phase- and frequency modulation for existing analogue networks, and on the other hand, 4-FSK (FSK: Frequency Shift Keying) modulation for DMR. Funkwerk’s solution according to ETSI TS 102 398 Tier 2 will be provided with the following specific features: ■ ■ ■ ■ ■ Modular Dual-Mode- system concept (analogue & digital) Mobile terminals (IP54) User-friendly configuration management System integration of existing and new operator platforms Intelligent (programmable) dynamic group call-scenarios IP 5 4 Base Station 8 Base Station 1 Base Station Switching Gateway 2 6 3 PSTN/ISDN PABX/PDN 7
Technical Details DMR Features Fast call setup times and stabile high voice- and data transmission quality up to the edges of network coverage at the same ERP levels (ERP: effective radio power), as previously used within the analogue networks, are obvious improvements. Due to short switching times within the transceiver hardware the provision of a full-duplex mode for voice communication is possible by using one single radio carrier only. Higher link capacity on the air interface at a given bandwidth can be provided because of the two-timeslot TDMA-channel access scheme (TDMA: Time Division Multiple Access) at one RF-carrier. In addition, the specified DMR RF-carrier spacing is 12.5 kHz only. Due to the TDMA-based discontinuous transmission, longer usage times can be achieved at the same battery capacity for handhelds. Further features include: ■ Transmission of calling status (e.g. busy tone, calling tone, user ID, etc.) ■ Easy integration of TCP/IP- protocol based packet data transmission (6.5 kbps per timeslot) ■ Short Data Service (SDS) The Funkwerk Solution Based on the dual mode capability of Funkwerk’s solution, a useful platform will be provided for enabling longer term system migrations from the analogue to the digital era. Old terminal devices can be swapped step by step. After a complete change out of the old terminals, the mode change from analogue to DMR can be easily implemented. The modular hardware design of the terminal equipment (optional GSMmodule and/or GPS) as well as many interfaces allow for easy integration, adaptation, as well as the new development of application environments (e.g. GPS-tracking, dead-man’s-control, railway shunting operation, transponder recognition, and many other applications). DMR 68 - 87,5 MHz (4m) DMR 146 - 174 MHz (2m) TETRA (BOS) 380 - 385 / 390 - 395 MHz (0,7 m) TETRA 385 - 390 / 395 - 400 / 410 - 430 / 440 - 470 MHz (0,7 m) DMR-TETRA-Frequency diagram Relevant DMR specifications of ETSI ■ ■ ■ ■ ■ ■ ■ ■ TS 102 361-1 TS 102 361-2 TS 102 361-3 TS 102 361-4 TS 102 362-1 TS 102 362-2 TS 102 362-3 TR 102 398 DMR 406 - 430 / 440 - 470 MHz (0,7 m) 400 300 200 100 3
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DMR Digital Mobile Radio - Romkatel

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