IEEE Std 802.15.4t-2017 pdf download – IEEE Standard for Low-Rate Wireless Networks Amendment 4: Higher Rate (2 Mb/s) Physical (PHY) Layer.
6. MAC functional description Change the title of 6.17 as indicated: 6.17 Using link margin IE inan-RS- GFSK PAN Change the first and second paragraphs of 6.17 as indicated: A device may include ant RS GFSK Link Margin IE within an enhanced acknowledgment. The RS GFSK Link Margin IE shall only be transmitted as part of an Enh-Ack frame. If a device receives an Enh-Ack frame containing att RS GFSK Link Margin IE, it may adjust its transmit power within its power control range in all following GTS transmissions directed to the originating device. The transmit power control shall ignore the RS-GFSK-Link Margin IE when the device is transmitting non- GTS frames. If a device supports more than one data rate. a higher layer may use the information contained in the Link Margin IE to determine that the link margin is sufficient to support a higher data rate. The RS- GFSK-Link Margin IE is described in 7.4.4.32. Change the fourth andfifth paragraphs of 6.17 as indicated: The algorithm that controls the transmission of the RS GFSK-Link Margin IE and the algorithm that acts on the reception of the RS GFSK-Link Margin IE are outside the scope of this standard. If the security level, as described in 9.4.1.1, of the incoming Enh-Ack frame containing the RS GFSK-Link Margin IE is lower than that of the frame being acknowledged, then the RS -GFSK Link Margin IE shall be ignored.
7. MAC frame formats 7.2 General MAC frame format 7.2.10 FCS field Change the first paragraph of 7.2.10, including breaking the paragraph into two separate paragraphs, as indicated, and add the following new paragraph: The FCS field contains a 16-bit ITU-T CRC or a 32-bit CRC equivalent to ANSI X3.66-1979. The FCS is calculated over the MHR and MAC payload parts of the frame; these parts together are referred to as the calculation field. Devices compliant with one or more of the SUN PHYs or TVWS PHYs shall implement the 4-octet FCS. Devices compliant with the MSK PHY implementing the 2000 kb/s data rate shall implement both the 2- octet and 4-octet FCS. as indicated by the contents of the Extended PHR field described in 18.1.2. If the Extended PHR field is set to one, the 4-octet FCS shall be used; if the Extended PHR field is set to zero, the 2-octet FCS shall be used.