MCS modes and parameters The IEEE 802.15.4q consists of two PHYs: ULP-TASK and ULP-GFSK. MCS and related parameters for both the PHYs are shown in Table 2-Table 4 2: ULP-TASK PHY modulation and coding schemes and related parameters MCS Modulation format Coding format Bits per symbol Chips per symbol Code rate 0 1/1-TASK BCH 1 1 51/63 1 2/4- TASK BCH 2 4 51/63 2 3/8- TASK BCH 3 8 51/63 3 5/32- TASK BCH 5 32 51/63 4 (Optional) 1/1-TASK BCH+ SiPC concatenation 1 1 408/567 5 (Optional) 2/4- TASK BCH+SiPC concatenation 2 4 408/567 6 (Optional) 3/8- TASK BCH+SiPC concatenation 3 8 408/567 7 (Optional) 5/32- TASK BCH+SiPC concatenation 5 32 408/567 Table 3: ULP-TASK PHY channel bandwidths in various frequency bands Frequency Band (MHz) Chip rate (kcps) Channel bandwidth (KHz) 433.050 – 434.790 250 400 470 – 510 250 800 779 – 787 600 2 863 – 876 600 2 902 – 928 600 2 928 – 960 600 2 2400 – 2483.5 1000 2 Table 4: ULP-GFSK PHY modulation and coding schemes and related parameters ULP GFSK MCS Identifier Data Rate [kbps] Channel Spacing [kHz] Mod index Receiver BW (kHz) Average Transmit (dBm) Receiver sensitivity (dBm) Average Frame Lengths (Octets) 0 4.8 12.5 0.72 10 0 - 20 -117 30
Coexisting Systems in 2400 – 2483.5 MHz Band Table 13 shows the list of other 802 systems that share 2400 – 2483.5 MHz band with the PHYs in 802.15.4q. Table 13: Dissimilar systems co-existing with the 802.15.4q PHYs within the in 2400 – 2483.5 MHz band Standard Standard PHY Spec Involved 802.15.4q PHY 802.11b DSSS ULP-TASK ULP-GFSK 802.11g OFDM 802.11n OFDM 802.15.3 FHSS 802.15.4 SC DSSS 802.15.4f MSK 802.15.4g MR – FSK MR – OFDM MR – OQPSK 802.15.4k FSK DSSS Coexistence scenarios and analysis This clause presents the analysis of the interference caused by IEEE 802.15.4q devices to the IEEE 802 standard devices identified in 5, and vice versa. Note that the interferer parameters chosen in the following sub-clauses are chosen for the purpose of coexistence analysis in this CA document and are a sub-set of the available modes. PHY Modes in ULP-TASK PHY Various MCS modes of ULP-TASK and the corresponding parameters for different frequency bands are provided in 4.3. For the sake of brevity, we here consider only two MCS modes across all frequency bands: MCS-1 (2/4-TASK with BCH encoding and interleaving) MCS-3 (5/32-TASK with BCH encoding and interleaving) Parameters for ULP-TASK PHY The parameters for the MCS modes chosen for evaluation are given in Table 14. Table 14: MCS modes in ULP-TASK selected for coexistence analysis MCS Transmit (dBm) Receiver type Receiver Sensitivity (dBm) Average Frame Lengths (Octets) 2/4-TASK 0 dBm Non-coherent -90 20 5/32-TASK Non-coherent -85 20
Coexistence performance in 951 – 958 MHz band This sub-clause presents the coexistence performance of the systems coexisting in the in 951 – 958 MHz band. An involving system is set as the victim while all other systems are set as the interferer, in order to understand the impact of the generated interference. All systems including the 802.15.4q systems and other 802 systems in the in 951 – 958 MHz band are set as the victim in a round-robin manner. Parameters for Coexistence quantification The following sub-clauses present the parameters involved in quantification of coexistence analysis among the participating systems. PHY mode parameters of coexisting standards Table 21 shows the parameters for the PHY modes in each standard that is coexisting within the in MHz band. Table 21: Major parameters of systems in the 951-958 MHz System PHY Spec PHY Mode Channel Bandwidth (KHz) Transmit Power (dBm) Receiver Sensitivity Average Frame Length (Octets) 802.15.4 DSSS BPSK, 300 kcps, 20 kbps 2000 0 -92 22 GFSK GFSK-100 kbps 200 0 -85 250 802.15.4g MR – FSK FSK 50 kbps, h = 1.0 200 0 -91 250 MR – OFDM QPSK, 200 kbps, OFDM Option 2, MCS2 800 0 -100 20 MR – QPSK, 1000 kcps, Rate Mode 3 2000 0 -90 20 BER/PER for PHY modes of coexisting 802 Standards In this sub-clause, the BER / PER performance corresponding to SNR for the 802 standards within the frequency band is presented. The parameter SNR is defined as the ratio between the energy in each chip to the noise power spectral density in each chip. Figure 22: BER vs. SNR for 802 systems in the 951-958 MHz band Figure 23: PER vs. SNR for 802 systems in the 951-958 MHz band