Add counters: pcu.bts.N.pch.requests

Count attempted paging requests over PCH.

Related: SYS#4878
Change-Id: I1026780ef8542f40060b961df2f37213e15c29d7
diff --git a/src/bts.cpp b/src/bts.cpp
index ee6b915..4e3b770 100644
--- a/src/bts.cpp
+++ b/src/bts.cpp
@@ -132,8 +132,9 @@
 	{ "llc:scheduled",		"Scheduled Frames     "},
 	{ "llc:dl_bytes",               "RLC encapsulated PDUs"},
 	{ "llc:ul_bytes",               "full PDUs received   "},
-	{ "rach:requests",		"RACH requests        "},
-	{ "11bit_rach:requests",	"11BIT_RACH requests  "},
+	{ "pch:requests",		"PCH requests sent    "},
+	{ "rach:requests",		"RACH requests received"},
+	{ "11bit_rach:requests",	"11BIT_RACH requests received"},
 	{ "spb:uplink_first_segment",   "First seg of UL SPB  "},
 	{ "spb:uplink_second_segment",  "Second seg of UL SPB "},
 	{ "spb:downlink_first_segment", "First seg of DL SPB  "},
diff --git a/src/bts.h b/src/bts.h
index a2f4598..c28bd97 100644
--- a/src/bts.h
+++ b/src/bts.h
@@ -125,6 +125,7 @@
 	CTR_LLC_FRAME_SCHED,
 	CTR_LLC_DL_BYTES,
 	CTR_LLC_UL_BYTES,
+	CTR_PCH_REQUESTS,
 	CTR_RACH_REQUESTS,
 	CTR_11BIT_RACH_REQUESTS,
 	CTR_SPB_UL_FIRST_SEGMENT,
diff --git a/src/gprs_rlcmac.cpp b/src/gprs_rlcmac.cpp
index 71849b8..ffa656c 100644
--- a/src/gprs_rlcmac.cpp
+++ b/src/gprs_rlcmac.cpp
@@ -47,6 +47,7 @@
 		LOGP(DRLCMAC, LOGL_ERROR, "TX: [PCU -> BTS] Failed to encode Paging Request\n");
 		return -1;
 	}
+	bts_do_rate_ctr_inc(bts, CTR_PCH_REQUESTS);
 	pcu_l1if_tx_pch(bts, paging_request, plen, pgroup);
 	bitvec_free(paging_request);