IEEE Std 802.15.4w-2020 pdf download – IEEE Standard for Low-Rate Wireless Networks Amendment 2: L ow Power Wide Area Network (LPWAN) Extension to the L ow-Energy Critical Infrastructure Monitoring (LECIM) Physical Layer (PHY).
The Operating Band field is an unsigned integer, and shall be set to a non-reserved bit number given in Table 7-9. The Symbol Rate field is an unsigned integer that corresponds to a symbol rate in Table 7-36a, lecimBaseMultiplier is defined in 10.1.3.11.3. The Channel Spacing field is an unsigned integer that corresponds to a channel spacing in Table 7-36b, lecimBaseMultiplier is defined in 10.1.3.11.3. The FEC Mode field is an unsigned integer that corresponds to a FEC mode as given in Table 7-36c. The Spreading Enabled field shall be set to one if spreading is enabled and shall be set to zero otherwise. The Spreading Factor field is an unsigned integer that corresponds to a spreading factor in Table 7-36.
23.2.2.2 Preamble field format Change 23.2.2.2 as follows: The attribute phyLecimFskPreambleLength. as described in 1 I .3. controls the length of the preamble. The Preamble field shall contain phyLecimFskPreambleLength, as defined in 1.3, multiples of the 8-bit sequence“01010101″ The preamble field shall be omitted when phyLecimFskPreambleLength equals 0. In non-split mode. for the purposes of calculating the Ack frame timing required in 6.7.5. the Preamble field length of 4 octets shall be used. For split mode. the Ack frame timing shall be calculated based on the first radio-burst and using the Preamble field length of0 octets. 23.2.3 PHR field format Insert new text at the end of 23. 2.3 as follows: For non-split mode, the full 11-bit range PSDU size given by the Frame Length field shall be supported. The maximum PSDU size for split mode shall be 184 octets. NOTE- -The actual PSDU size may not be known to the receiver before reception of the last radio burst. A lower maximum PSDU size may be chosen based on implementation requirements.