RF carrier spacing (kHz) 12.5 for 8K10F1E (C4FM) 6.25 for 5K76G1E (CQPSK) 25 25 25 12.5-10 6.25 evolution 25/12.5 25 1 250 25, minimum 1 230 (800 MHz) 1 250 (else) Maximum base station e.r.p. (W): – peak – average 500 500 Not specified Typically 40-300 Not specified 250 25 200 200 Max. 10 W at antenna, with antenna gain below level required by regulation; average: 10 Not specified. Typically ERP (dBW) = 22 Peak : 105 (800 MHz band) Typical: 63 (800 MHz band) Peak: 60 (other bands) Typical: 36 (other bands) Nominal mobile station transmit power (W) Peak/average: – mobile – handheld from 10/10 to 110/110 from 1/1 to 5/5 –/2 Not specified 10.4/0.5 3.5/0.17 10/10 2/2 10/10-110/110 1/1-6/6 4/1.33(4) 0.6/0.2 0.2 0.2-1 Cell radius (km): – handheld/ suburban – 7.6-35 7.6 35 3.8-17.5 3.8 17.5 Not yet determined Not yet determined 20-40 5-40 (design dependent) 5 40 8-28 8 28 Design dependent Design dependent 7-13 50 Design dependent Maximum cell radius as in TETRA1 Design and deployment dependent Typically: 1.5, Maximum: 100 Area coverage technique Cellular channel Simulcast Voting receivers Cellular channel Quasi synchronous (Simulcast) Time-sharing transmission Diversity receivers Cellular channel reuse Diversity receivers (base) Cellular channel reuse Diversity receivers Cellular channel reuse Simulcast Diversity receiver (Time-sharing transmission) Cellular channel reuse Simulcast Voting receivers Diversity receivers Cellular channel reuse and sectorization(5) Diversity receivers, time synchronous Cellular channel reuse of 1 and sectorization Diversity receivers Cellular channel reuse and sectorization Diversity receivers (base station) Cellular channel reuse of 1and sectorization Diversity receivers
Parameter Project 25 TETRA1 IDRA DIMRS TETRAPOL FHMA CDMA-PAMR TETRA enhanced data service GoTa Access method FDMA TDMA in development TDMA TDMA TDMA FDMA FDMA FHMA (TDMA/FHM) CDMA Multi-carrier modulation (MCM) TDMA CDMA Traffic channels/RF carrier: – initial – design capability Integrated voice and data modes FDMA: 1 TDMA: 2 @ 12.5 kHz TDMA: 4 @ 25 kHz FDMA: 1 TDMA: 2 or 4 4 6 6. 3, 12 6 6, 4, 3, 8, 12, etc. 1 1 1 1 3 Not specified See specifications and published standards As in TETRA1 See specifications and published standards 61 253 Transmission rate (kbit/s) Integrated and data modes FDMA: 9.6 TDMA 2-slot: TBD, ranging from 9.6-12 TDMA 4-slot: TBD, ranging from 22-24 700 MHz data only modes 50 kHz: 76.8-230.4 kbit/s 100 kHz: 153.6-460.8 kbit/s 150 kHz: 230.4-691.2 kbit/s 36 64 64 8 9.6 36.9 9.6 or 14.4 690 Maximum 9.6~153.6 Support up to 1.8 Mbit/s on the reverse link and up to 4.9 Mbit/s on the forward link
Parameter Project 25 TETRA1 IDRA DIMRS TETRAPOL FHMA CDMA-PAMR TETRA enhanced data service GoTa Modulation FDMA integrated and data modes: QPSK-c family includes C4FM and CQPSK TDMA voice modes: 2-slot: TBD; QPSK-c family (includes C4FM and CQPSK) and CPM under consideration 4-slot: TBD; CPM under consideration 700 MHz modes 50 kHz: QPSK 100 kHz: 150 kHz: /4-DQPSK M16-QAM (M  4) M16-QAM (M  4) GMSK GFSK /4 SQPSK /8-D8PSK, 4-QAM, 16-QAM, 64-QAM BPSK QPSK 8PSK 16QAM Traffic channel structure: – Basic rate speech codec: – Bit rate (kbit/s) – Error protection – Coding algorithm – rate speech codec: – Bit rate (kbit/s) – Error protection – Coding algorithm FDMA 4.4 2.8 IMBE TDMA (2 and 4 slot) 2.450 proposed 1.150 proposed IMBE enhanced half rate 4.567 Bit rate with error protection is less than 7.467 Not specified 4.2 3.177 VSELP (6:1) 6 2 RPCELP 6.5 2.7 AME 4.4 5.596 IMBE/AMBE 9.6, 4.8, 2.4, and 1.2 EVRC, SMV As in TETRA1 9.6, 4.8, 2.4, 1.2 CRC EVRC QAM
3.1.8 TEDS throughput Not all combinations of channel bandwidth, modulation type and coding rate are permitted in TEDS channels. The combinations have been limited to shown in the second column of Table 5. This table also provides an estimate of the throughput, after allowance is made for the pilot symbols, channel coding and lower layer protocol headers and functions. These are technically the bit rates, but are close to the true bit rates available to user IP packets in good channel conditions. TABLE 5 Permissible modulation type/coding rate pair and expected throughput in each channel bandwidth Channel width Modulation type and coding rate TEDS channel throughput (kbit/s) 25 kHz /4-DQPSK r = 2/3 14.8 /8-D8PSK r = 2/3 24.3 4-QAM r = ½ 11 16-QAM r = ½ 22 64-QAM r = ½ 33 64-QAM r = 2/3 44 64-QAM r = 1 66 50 kHz 4-QAM r = ½ 27 16-QAM r = ½ 54 64-QAM r = ½ 80 64-QAM r = 2/3 107 64-QAM r = 1 160 100 kHz 4-QAM r = ½ 58 16-QAM r = ½ 116 64-QAM r = ½ 175 64-QAM r = 2/3 233 64-QAM r = 1 349 150 kHz 4-QAM r = ½ 90 16-QAM r = ½ 179 64-QAM r = ½ 269 64-QAM r = 2/3 359 64-QAM r = 1 538 3.2 TEDS higher protocol layers Figure 32 shows the TEDS air interface protocol stack and its relation to IP applications. Note that TEDS services are IP based. TETRA voice channels and circuit mode data (at speeds up to 28.8 kbit/s) are only available in an integrated TETRA1 part. These services share the enhanced MAC layer of Fig. 32. For ease of compatibility TEDS uses the same control channel as the existing TETRA standard. The details of the TEDS standard are given in [ETSI].
FIGURE 32 TEDS enhanced air interface protocol stack 3.2.1 IP packet data in TEDS The TETRA standard provides TETRA MSs with the means to support packet data, and the TEDS extends this to higher bit rates, adds new QoS features as well as some performance enhancing features. Multiple TETRA MSs may share a packet data channel (PDCH) assigned for the exchange of packet data between the BS and MSs. MSs contend for resource on the shared channel – the BS then allocates resource to individual MSs. TEDS extends this concept by providing guaranteed resources for packet data at regular intervals (scheduled access) by allowing MSs to indicate differing data priorities for their resource allocations (data priority) and by providing the BS with an efficient method to transmit resource allocations that fit around scheduled resources. Scheduled access provides an efficient method for the SwMI to accommodate regularly recurring intermittent data. 3.2.2 MEX layer The multimedia exchange (MEX) layer is an optional layer located above the MS SNDCP. The chief purpose of MEX layer is to manage the multiplexing of IP packets from multiple applications according to a relative MEX precedence so that, where delivery is limited by lack of channel resources, each application using MEX gets a prearranged share of the total resource (this is different from data priority). This is useful for controlling the relative flow rate of data packets serving different aspects of a multimedia application (e.g. audio and video). Applications using MEX connect to the TCP/UDP layers via a port number and IP address (i.e. a socket) for routing the application data and control signalling. The port specification eliminates the need for using a MEX layer at the SwMI. The MEX layer provides internal data precedence management for up to eight simultaneous applications. Each application can choose one of eight unique precedence levels. The MEX precedence mechanism consists of an application list, eight buffers and a precedence switch as shown in Fig. 33. 33 MEX precedence to PDP context activation, the application chooses the MEX precedence level. After an application chooses its MEX precedence, its payload is routed to a particular buffer. Each buffer output is connected to a precedence switch, which services highprecedence buffers more frequently than lower precedence buffers. In the example of Fig. 33, three applications have populated the precedence list. Application 1 data will be serviced eight times more frequently than application 3