Add utility to check proper scheduling of SI
There are several types of System Information messages with tricky scheduling rules described in 3GPP TS 05.02 § 6.3.1.3. This GNU Awk script takes in .csv file with sequence of scheduled SI messages (for example generated using tshark from GSMTAP capture - see usage note inside the script) and check the scheduling rules compliance.
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#!/usr/bin/gawk -f
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# Usage example:
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# tshark -2 -t r -E 'header=n' -E 'separator=,' -E 'quote=n' -T fields -e gsmtap.frame_nr -e gsmtap.ts -e gsmtap.arfcn -e _ws.col.Info -Y 'gsmtap' -r test.pcapng.gz | grep Information | env ARFCN=878 ./si_check.gawk
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# read summary on number of bis/ter messages and adjust BT_BOTH and BT_NONE environment variables accordingly
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BEGIN {
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FS = ","
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FAILED = 0
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IGNORE = 0
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BIS = 0
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TER = 0
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QUA = 0
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BT_BOTH = ENVIRON["BOTH"]
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BT_NONE = ENVIRON["NONE"]
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TC_INDEX = 0
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TC4[4] = 0
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}
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{ # expected .csv input as follows: gsmtap.frame_nr,gsmtap.ts,gsmtap.arfcn,_ws.col.Info
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if ("ARFCN" in ENVIRON) { # ARFCN filtering is enabled
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if (ENVIRON["ARFCN"] != $3) { # ignore other ARFCNs
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IGNORE++
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next
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}
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}
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type = get_si_type($4)
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tc = get_tc($1)
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result = "FAIL"
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if (1 == check_si_tc(tc, type)) { result = "OK" }
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else { FAILED++ }
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if (4 == tc) {
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TC4[TC_INDEX] = type
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TC_INDEX = int((TC_INDEX + 1) % 4)
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if (0 == check_tc4c(type) && "OK" == result) {
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result = "FAIL"
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FAILED++
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}
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}
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if (type == "2bis") { BIS++ }
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if (type == "2ter") { TER++ }
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if (type == "2quater") { QUA++ }
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# for (i in TC4) print TC4[i] # debugging
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printf "ARFCN=%d FN=%d TS=%d TC=%d TYPE=%s %s\n", $3, $1, $2, tc, type, result
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}
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END {
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printf "check completed: total %d, failed %d, ignored %d, ok %d\nSI2bis = %d, SI2ter = %d, SI2quater = %d\n", NR, FAILED, IGNORE, NR - FAILED - IGNORE, BIS, TER, QUA
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if ((BIS > 0 || TER > 0) && BT_NONE) { printf "please re-run with correct environment: unset 'NONE' variable\n" }
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if ((BIS > 0 && TER > 0) && !BT_BOTH) { printf "please re-run with correct environment: set 'BOTH' variable\n" }
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}
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func get_si_type(s, x) { # we rely on format of Info column in wireshark output - if it's changed we're screwed
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return x[split(s, x, " ")]
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}
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func get_tc(f) { # N. B: all numbers in awk are float
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return int(int(f / 51) % 8)
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}
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func check_tc4c(si, count) { # check for "once in 4 consecutive occurrences" rule
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count = 0
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if ("2quater" != si || "2ter" != si) { return 1 } # rules is not applicable to other types
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if (BT_NONE && "2quater" == si) { return 0 } # should be on TC=5 instead
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if (!BT_BOTH && "2ter" == si) { return 0 } # should be on TC=5 instead
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if (0 in TC4 && 1 in TC4 && 2 in TC4 && 3 in TC4) { # only check if we have 4 consecutive occurrences already
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if (si == TC4[0]) { count++ }
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if (si == TC4[1]) { count++ }
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if (si == TC4[2]) { count++ }
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if (si == TC4[3]) { count++ }
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if (0 == count) { return 0 }
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}
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return 1
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}
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func check_si_tc(tc, si) { # check that SI scheduling on BCCH Norm is matching rules from 3GPP TS 05.02 § 6.3.1.3
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switch (si) {
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case "1": return (0 == tc) ? 1 : 0
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case "2": return (1 == tc) ? 1 : 0
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case "2bis": return (5 == tc) ? 1 : 0
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case "13": return (4 == tc) ? 1 : 0
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case "9": return (4 == tc) ? 1 : 0
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case "2ter": if (BT_BOTH) { return (4 == tc) ? 1 : 0 } else { return (5 == tc) ? 1 : 0 }
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case "2quater": if (BT_NONE) { return (5 == tc) ? 1 : 0 } else { return (4 == tc) ? 1 : 0 }
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case "3": return (2 == tc || 6 == tc) ? 1 : 0
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case "4": return (3 == tc || 7 == tc) ? 1 : 0
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}
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return 0
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}
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