MIL-STD-187-721 Interoperability And Performance Standard For Advanced Adaptive Hf RadioThe purpose of this document is to describe the technical parameters for adaptive high frequency HF radio that are more advanced than those described in MIL-STD-188-141. The advanced technology contained in this standard will guide the planning of military adaptive HF radio network technology into the 21st century. To fully understand and utilize this document, it is necessary to refer to portions of MIL-STD-188-141.

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MIL-STD-187-721D

TABLE VI. Age field encoding.

f. LQA reports may be sent either upon request or by pre-arranged schedule. A station may request an LQA report by sending an LQA report request, which shall be formatted as shown on figure 8. The bits of the control field are used to request the format of LQA reports, and shall be assigned in accordance with table V. The Age field specifies the maximum age acceptable for the reports and shall be encoded in accordance with table VI. If the Age field is set to 110, all channels with LQA measurements shall be reported; if the Age field is set to

111, all channels common to the two stations shall be reported, including those for which no data is available.

3 7 2 5 4					3
CMD	LQA Report (ASCII 'r')	Type	Control	*	Age
110	1110010	10		0000
* Reserved block (set to 0000)

FIGURE 8. LQA report request CMD format.

5.5 Advanced link quality analysis.

Stations supporting ALQA shall maintain an ALQA matrix analogous to the LQA matrix (see the section on Connectivity and LQA Memory in MIL-STD-188-141) that stores histograms as described in 4.5.3 for the stations listed in the section on Other Address Memory in MIL-STD-

188-141. For each station, the ALQA matrix shall contain one set of histograms for each implemented channel quality measure for each channel scanned, and one set of histograms for each implemented link performance measure.