RRC: Remove check for UE with random ID in RRC Setup Request

From the spec, it does not seem to be mandated to check that the random
identity needs to be unique within a cell. Also, from experience we see
that this only happens when the same UE "comes back"; so since one UE
can only have one connection, the other RRC UE contexts (with the same
identity) should be removed at some point, anyway, leaving only one with
the same identity.

openair2/RRC/NR/rrc_gNB.c

@@ -1160,14 +1160,6 @@ static void rrc_handle_RRCSetupRequest(gNB_RRC_INST *rrc,
            rrcSetupRequest->ue_Identity.choice.randomValue.buf,
            rrcSetupRequest->ue_Identity.choice.randomValue.size);
 
-    /* if there is already a registered UE (with another RNTI) with this random_value,
-     * the current one must be removed from MAC/PHY (zombie UE)
-     */
-    if ((ue_context_p = rrc_gNB_ue_context_random_exist(rrc, random_value))) {
-      LOG_W(NR_RRC, "new UE rnti (coming with random value) is already there, removing UE %x from MAC/PHY\n", msg->crnti);
-      AssertFatal(false, "not implemented\n");
-    }
-
     ue_context_p = rrc_gNB_create_ue_context(assoc_id, msg->crnti, rrc, random_value, msg->gNB_DU_ue_id);
   } else if (NR_InitialUE_Identity_PR_ng_5G_S_TMSI_Part1 == rrcSetupRequest->ue_Identity.present) {
     /* <5G-S-TMSI> = <AMF Set ID><AMF Pointer><5G-TMSI> 48-bit */