The link adaptation algorithms will adjust the bit rate to adapt the packet data throughput to the distance from the base station and the prevailing propagation conditions at different locations in the cell. 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 those 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 “TL-SDU” 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) /4-DQPSK = 2/3 14.8 r = 2/3 24.3 r 4-QAM = ½ 11 r 25 kHz 16-QAM = ½ 22 r 64-QAM = ½ 33 r 64-QAM = 2/3 44 r 64-QAM = 1 66 r 4-QAM = ½ 27 r 16-QAM = ½ 54 r 50 kHz 64-QAM = ½ 80 r 64-QAM = 2/3 107 r 64-QAM = 1 160 r 4-QAM = ½ 58 r 16-QAM = ½ 116 r 100 kHz 64-QAM = ½ 175 r 64-QAM = 2/3 233 r 64-QAM = 1 349 r 4-QAM = ½ 90 r 16-QAM = ½ 179 r 150 kHz 64-QAM = ½ 269 r 64-QAM = 2/3 359 r 64-QAM = 1 538 r 3.2 TEDS higher protocol layers Figure 30 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. 30. For ease of compatibility TEDS uses the same control channel as the existing TETRA standard. The details of the TEDS standard are in [ETSI].
The link adaptation algorithms will adjust the bit rate to adapt the packet data throughput to the distance from the base station and the prevailing propagation conditions at different locations in the cell. 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 those 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 “TL-SDU” 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 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 30 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. 30. For ease of compatibility TEDS uses the same control channel as the existing TETRA standard. The details of the TEDS standard are in [ETSI].
R12-WP5A-C-0736!N05!MSW-E.docx