WRC23 AI9.1b: ITU‑R Study Group 4 finalises the 23cm/RNSS study report

Dur­ing the peri­od 7–13 Sep­tem­ber 2022, the IARU once again par­tic­i­pat­ed in the prepara­to­ry work for WRC-23 agen­da item 9.1b in ITU‑R Work­ing Par­ty 4C (WP4C). The IARU sum­ma­ry report on the WP4C meet­ing can be found here.

Updat­ed stud­ies were pro­vid­ed by France and new stud­ies were con­tributed by the Russ­ian Fed­er­a­tion (GLONASS), Chi­na (COMPASS) and Japan.

The IARU pro­vid­ed a con­tri­bu­tion pro­vid­ing infor­ma­tion agreed in WP5A high­light­ing the low dura­tion of “busy times” for ama­teur activ­i­ties in the 23cm band. This infor­ma­tion was adopt­ed into the draft report. Whilst the stud­ies con­firm the poten­tial for inter­fer­ence to occur into co-fre­quen­cy RNSS receivers in almost the entire band, all the stud­ies have assumed only sta­t­ic sce­nar­ios with­out any con­sid­er­a­tion of the geo­graph­ic dis­tri­b­u­tion and den­si­ty of ama­teur trans­mit­ters or the tem­po­ral aspects of ama­teur or RNSS oper­a­tions. Some stud­ies take account of anten­na pat­terns, but many results and con­clu­sions focus only on worst case main beam con­sid­er­a­tion. The IARU Region 1 has pub­lished a com­men­tary doc­u­ment on these aspects avail­able here.

As a result of these stud­ies and the reg­u­la­to­ry sta­tus of the ama­teur ser­vice allo­ca­tion, our abil­i­ty to oper­ate in cer­tain parts of the band and at the pow­er lev­els allowed today is like­ly to be con­strained if reg­u­la­tors want to pro­tect the RNSS receivers. This dis­cus­sion will con­tin­ue in the devel­op­ment of the Guid­ance Rec­om­men­da­tion in ITU‑R WP5A.

WP4C ple­nary agreed to ele­vate the doc­u­ment to Draft New Report sta­tus and passed it to Study Group 4 (SG4) for adop­tion. There­fore draft­ing work is complete.

Study Group 4 met on Sep­tem­ber 23rd and adopt­ed the report for pub­li­ca­tion. IARU is total­ly engaged in the dis­cus­sion that will con­tin­ue in WP5A to ensure that the ama­teur ser­vices can con­tin­ue to devel­op in this band and allow all the ama­teur appli­ca­tions in use today to continue.

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