diff --git a/openbsc/include/openbsc/gprs_sgsn.h b/openbsc/include/openbsc/gprs_sgsn.h
index 18cbab8..24e286c 100644
--- a/openbsc/include/openbsc/gprs_sgsn.h
+++ b/openbsc/include/openbsc/gprs_sgsn.h
@@ -31,6 +31,16 @@
 	GMM_DEREGISTERED_INIT,		/* 4.1.3.3.1.4 */
 };
 
+/* TS 23.060 6.1.1 and 6.1.2 Mobility management states A/Gb and Iu mode */
+enum gprs_pmm_state {
+	PMM_DETACHED,
+	PMM_CONNECTED,
+	PMM_IDLE,
+	MM_IDLE = PMM_DETACHED,
+	MM_READY = PMM_CONNECTED,
+	MM_STANDBY = PMM_IDLE,
+};
+
 enum gprs_mm_ctr {
 	GMM_CTR_PKTS_SIG_IN,
 	GMM_CTR_PKTS_SIG_OUT,
@@ -117,6 +127,7 @@
 
 	char 			imsi[GSM23003_IMSI_MAX_DIGITS+1];
 	enum gprs_gmm_state	mm_state;
+	enum gprs_pmm_state	pmm_state;	/* Iu: page when in PMM-IDLE mode */
 	uint32_t 		p_tmsi;
 	uint32_t 		p_tmsi_old;	/* old P-TMSI before new is confirmed */
 	uint32_t 		p_tmsi_sig;
diff --git a/openbsc/src/gprs/gprs_gmm.c b/openbsc/src/gprs/gprs_gmm.c
index 53b6322..99e4a8c 100644
--- a/openbsc/src/gprs/gprs_gmm.c
+++ b/openbsc/src/gprs/gprs_gmm.c
@@ -131,6 +131,8 @@
 	case IU_EVENT_LINK_INVALIDATED:
 		/* Clean up ue_conn_ctx here */
 		LOGMMCTXP(LOGL_INFO, mm, "IU release for imsi %s\n", mm->imsi);
+		if (mm->pmm_state == PMM_CONNECTED)
+			mm->pmm_state = PMM_IDLE;
 		rc = 0;
 		break;
 	case IU_EVENT_SECURITY_MODE_COMPLETE:
@@ -241,6 +243,7 @@
 
 	/* Mark MM state as deregistered */
 	ctx->mm_state = GMM_DEREGISTERED;
+	ctx->pmm_state = PMM_DETACHED;
 
 	sgsn_mm_ctx_cleanup_free(ctx);
 }
@@ -852,6 +855,7 @@
 	case GSM48_MT_GMM_SERVICE_REQ:
 		/* TODO: PMM State transition */
 		ctx->pending_req = 0;
+		ctx->pmm_state = PMM_CONNECTED;
 		rc = gsm48_tx_gmm_service_ack(ctx);
 
 		if (ctx->iu.service.type != GPRS_SERVICE_T_SIGNALLING)
@@ -1793,6 +1797,7 @@
 					  mmctx->gb.tlli_new);
 		}
 		mmctx->mm_state = GMM_REGISTERED_NORMAL;
+		mmctx->pmm_state = PMM_CONNECTED;
 		rc = 0;
 
 		memset(&sig_data, 0, sizeof(sig_data));
@@ -1815,6 +1820,7 @@
 					  mmctx->gb.tlli_new);
 		}
 		mmctx->mm_state = GMM_REGISTERED_NORMAL;
+		mmctx->pmm_state = PMM_CONNECTED;
 		rc = 0;
 
 		memset(&sig_data, 0, sizeof(sig_data));
diff --git a/openbsc/src/gprs/gprs_sgsn.c b/openbsc/src/gprs/gprs_sgsn.c
index dd7e008..e5a54d9 100644
--- a/openbsc/src/gprs/gprs_sgsn.c
+++ b/openbsc/src/gprs/gprs_sgsn.c
@@ -246,6 +246,7 @@
 	ctx->iu.ue_ctx = uectx;
 	ctx->iu.new_key = 1;
 	ctx->mm_state = GMM_DEREGISTERED;
+	ctx->pmm_state = PMM_DETACHED;
 	ctx->auth_triplet.key_seq = GSM_KEY_SEQ_INVAL;
 	ctx->ctrg = rate_ctr_group_alloc(ctx, &mmctx_ctrg_desc, 0);