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{hscale=2}

ms = MS/BTS
bsc = BSC
smlc = SMLC
msc = MSC

bsc < msc	PERFORM LOCATION REQUEST
		3GPP TS 48.008 3.2.1.71

---		MS in IDLE MODE (not connected)

ms < bsc	RR Paging Request
		3GPP TS 48.018 9.1.22-24

ms > bsc	RSL CHANNEL REQUIRED
		3GPP TS 48.058 8.5.3
		includes Access Delay (9.3.17) == Timing Advance

ms > bsc	RR Paging Response
		3GPP TS 48.018 9.1.25

ms < bsc	RF CHANNEL RELEASE
		3GPP TS 48.058 8.4.14

---		MS in DEDICATED MODE (currently active)

ms > bsc	earlier Measurement Report provides Timing Advance

---

bsc > smlc	BSSMAP-LE PERFORM LOCATION REQUEST
		3GPP TS 49.031 9.1
		Contains BSSLAP APDU with current TA value

smlc () .	No TA Request needed, already know the TA

bsc < smlc	BSSMAP-LE PERFORM LOCATION RESPONSE
		3GPP TS 49.031 9.2
		Returns same TA value

bsc > msc	PERFORM LOCATION RESPONSE
		3GPP TS 48.008 3.2.1.72