IEEE Std 802.15.4s-2018 pdf download – lEEE Standard forL ow-Rate Wire less Networks Amendment 6: Enabling Spectrum Resource Measurement Capability.
6.17.1.8 Received signal strength indicator (RSSI) Received Signal Strength Indicator is intended for use by the next higher layer or a common network manager existing in multiple wireless network environment, in order to assess the utilization of spectrum resource together with RCPI and RSNI. RSSI is a measure of the RF power received as described below. The RF power level at the input of the transceiver measured during the PHR and is valid after the SFD is detected. The minimum and maximum values are 0x00 and 0xff as shown in Table 8-77 and the values in between should be uniformly distributed. 6.17.1.9 Noise Histogram Noise Histogram is intended for use by the next higher layer or a common network manager existing in multiple wireless network environment, in order to optimize the utilization of spectrum resource. The Noise Histogram shall be a histogram of non-IEEE 802.15 noise power in the specifed channel defined as a functon of time over the measurement duration when CCA indicates idle and the device is neither transmitting nor receiving a frame. The Noise Histogram Report shall contain the IPI densities, defined in 6.17.1.7, observed in the channel for the IPI levels defined in Table 6-5. If the device operates in CCA Mode 4 or CCA capability is not used, the procedure shall returm with a Status of NON_ SUPPORTED.
If the Scope ID is“Path”, the value is valid on the path from the sending device to the PAN coordinator. The received device should send the SRM IEs to the parent device toward the PAN coordinator. The content of the SRM IEs can be modified to reflect its own situation. For example, the device may add the macAverageAccessDelay PIB attribute of its own to that in the SRM IE to represent the delay between the sending device and its own device and convey that value to the parent device. By performing the same process at the device on the path to the PAN coordinator, the PAN coordinator can estimate the total delay from the originated device. Note that a delay has additive characteristics, while the frame loss rate has multiplicative characteristics. It depends on the parameter about how to represent the characteristics of the path, which is not specified in the document. If the Scope ID is“Network,” the value is valid in the entire PAN. The received device should disseminate to all the neighboring device(s) by broadcast if it has not be received before. An example of using this Scope ID is to disseminate the maximum transmit power in this PAN, which is represented by phyMax TxPower.