IEEE 802.15.4v-2017 pdf free.IEEE Standard for Low-Rate Wireless Networks Amendment 5: Enabling/Updating the Use of Regional Sub-GHz Bands.
For all frequency bands, spreading is obtained by direct sequence spread spectrum (DSSS) applying various spreading factors. For the 780 Mhz, 915 Mhz, 915 MlIz.a. 915 Mhz-h. 915 Mhz-c, 917 MHz, and 2450 Mhz frequency bands, the SUN O-QPSK PIIY may support an alternative spreading factor for the PSDU, called multiplexed direct sequence spread spectrum (MDSSS),
22.2 PPDU format for SUN O-QPSK
22.2.1 SHR field format
22.2.1.1 Preamble field format
Uhange 22.2.1.1 as indicafrd:
The Preamble field shall contain a sequence of 56 bits, all zero, for the 780 Mhz. 915 Mhz, jIMh1z-a. 915 MHz-b. 915 Mhz-c. 917 Mu,, and 2450 Mhz frequency bands. It shall contain a sequence of 32 bits, all zero, for the 470 Mhz. 866 Mhz. 867 Mhz. 868 MHz, 870 MHz. 915 Mhhi-d. 915 Mhhz-e. 919 Mhz. and 920 MIt,. 920 Mhz-a. and 920 Mll,-b frequency hands.
22.2.2 PHR field format
Change the second paragraph of 22.2.2 as indicated:
For the 780 Mhz. 915 MHz, 915 Mhz-a. 915 Mhz-b. 915 Mhz-c. 917 Mhz, and 2450 MIt, frequency hands, the Spreading Mode field shall be set to one if M[)SSS is used for PSDU spreading. as described in 22.3.5. Otherwise. the Spreading Mode field shall be set to zero if DSSS is used for PSDU spreading. as described in 22.3.4. For the 470 MIt,. 866 MHz, LMllL,X6X MHz, 870 Mhz. 915 MIhi.-d. 915 Mhz-c. 919 MHz. and 920 Mhz. 920 Ml hz-a. and 920 MHz-b frequency bands, the Spreading Mode field shall be set to t.ero. i.e., MDSSS is not supported.
Change the first part of the second and third paragraphs of 22.3.13 as indicated:
In the 915 MHz_ 915 MHz-a. 915 MHz-b. 915 MHz-C. and 2450 MHz bands, the half-sine pulse shape is used to represent each baseband chip and is as follows:
In the 470 MHz, 780 MHz, 866 MHz, 867 MHz. 868 MHz, 870 MHz.915 MHz-d.915 MHz-e. 917 MHz, and919 MHz. 920 MHz, 920 MHz-a. and 920 MHz-b bands, a raised cosine pulse shape with roll-off factor ofr = 0.8 is used to represent each baseband symbol and is described as follows.
Geographic regional frequency band details
Geographic regions are listed in Table G.1 according to their frequency bands.IEEE 802.15.4 pdf download.