diff --git a/src/main/java/org.onosproject.xran/impl/DefaultXranStore.java b/src/main/java/org.onosproject.xran/impl/DefaultXranStore.java
new file mode 100644
index 0000000..7894b74
--- /dev/null
+++ b/src/main/java/org.onosproject.xran/impl/DefaultXranStore.java
@@ -0,0 +1,295 @@
+/*
+ * Copyright 2015-present Open Networking Laboratory
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.onosproject.xran.impl;
+
+import com.fasterxml.jackson.databind.JsonNode;
+import com.fasterxml.jackson.databind.node.ObjectNode;
+import com.google.common.collect.Lists;
+import org.apache.felix.scr.annotations.*;
+import org.onosproject.core.ApplicationId;
+import org.onosproject.core.CoreService;
+import org.onosproject.store.AbstractStore;
+import org.onosproject.xran.XranStore;
+import org.onosproject.xran.codecs.api.ECGI;
+import org.onosproject.xran.codecs.api.EUTRANCellIdentifier;
+import org.onosproject.xran.codecs.api.MMEUES1APID;
+import org.onosproject.xran.controller.XranController;
+import org.onosproject.xran.entities.RnibCell;
+import org.onosproject.xran.entities.RnibLink;
+import org.onosproject.xran.entities.RnibSlice;
+import org.onosproject.xran.entities.RnibUe;
+import org.onosproject.xran.identifiers.LinkId;
+import org.slf4j.Logger;
+
+import javax.xml.bind.DatatypeConverter;
+import java.util.List;
+import java.util.Optional;
+import java.util.concurrent.ConcurrentHashMap;
+import java.util.concurrent.ConcurrentMap;
+import java.util.stream.Collectors;
+
+import static org.slf4j.LoggerFactory.getLogger;
+
+/**
+ * Created by dimitris on 7/22/17.
+ */
+@Component(immediate = true)
+@Service
+public class DefaultXranStore extends AbstractStore implements XranStore {
+    private static final String XRAN_APP_ID = "org.onosproject.xran";
+
+    private final Logger log = getLogger(getClass());
+    @Reference(cardinality = ReferenceCardinality.MANDATORY_UNARY)
+    protected CoreService coreService;
+    private ConcurrentMap<LinkId, RnibLink> linkMap = new ConcurrentHashMap<>();
+    private ConcurrentMap<ECGI, RnibCell> cellMap = new ConcurrentHashMap<>();
+    private ConcurrentMap<MMEUES1APID, RnibUe> ueMap = new ConcurrentHashMap<>();
+    private ConcurrentMap<Object, RnibSlice> sliceMap = new ConcurrentHashMap<>();
+    private XranController controller;
+
+    @Activate
+    public void activate() {
+        ApplicationId appId = coreService.getAppId(XRAN_APP_ID);
+        log.info("XRAN Default Store Started");
+    }
+
+    @Deactivate
+    public void deactive() {
+        log.info("XRAN Default Store Stopped");
+    }
+
+    @Override
+    public List<RnibLink> getLinks() {
+        List<RnibLink> list = Lists.newArrayList();
+        list.addAll(linkMap.values());
+        return list;
+    }
+
+    @Override
+    public List<RnibLink> getLinksByECGI(ECGI ecgi) {
+        List<RnibLink> list = Lists.newArrayList();
+        list.addAll(
+                linkMap.keySet()
+                        .stream()
+                        .filter(k -> k.getSource().equals(ecgi))
+                        .map(v -> linkMap.get(v))
+                        .collect(Collectors.toList()));
+
+        return list;
+    }
+
+    @Override
+    public List<RnibLink> getLinksByCellId(String eciHex) {
+        List<RnibLink> list = Lists.newArrayList();
+        EUTRANCellIdentifier eci = hexToECI(eciHex);
+
+        list.addAll(
+                linkMap.keySet()
+                        .stream()
+                        .filter(k -> k.getSource().getEUTRANcellIdentifier().equals(eci))
+                        .map(v -> linkMap.get(v))
+                        .collect(Collectors.toList()));
+
+        return list;
+    }
+
+    @Override
+    public List<RnibLink> getLinksByUeId(long euId) {
+        List<RnibLink> list = Lists.newArrayList();
+        MMEUES1APID mme = new MMEUES1APID(euId);
+
+        list.addAll(
+                linkMap.keySet()
+                        .stream()
+                        .filter(k -> k.getDestination().equals(mme))
+                        .map(v -> linkMap.get(v))
+                        .collect(Collectors.toList()));
+
+        return list;
+    }
+
+    @Override
+    public RnibLink getLinkBetweenCellIdUeId(String eciHex, long euId) {
+        EUTRANCellIdentifier eci = hexToECI(eciHex);
+        MMEUES1APID mme = new MMEUES1APID(euId);
+
+        Optional<LinkId> first = linkMap.keySet()
+                .stream()
+                .filter(linkId -> linkId.getSource().getEUTRANcellIdentifier().equals(eci))
+                .filter(linkId -> linkId.getDestination().equals(mme))
+                .findFirst();
+
+        return first.map(linkId -> linkMap.get(linkId)).orElse(null);
+    }
+
+    @Override
+    public boolean createLinkBetweenCellIdUeId(String eciHex, long euId, String type) {
+        RnibCell cell = getCell(eciHex);
+        RnibUe ue = getUe(euId);
+
+        if (cell != null && ue != null) {
+            RnibLink link = new RnibLink();
+            link.setLinkId(cell, ue);
+
+            // TODO: string to enum mapping
+//            link.setType(type);
+
+            linkMap.put(link.getLinkId(), link);
+            return true;
+        }
+
+        return false;
+    }
+
+    @Override
+    public void storeLink(RnibLink link) {
+        if (link.getLinkId() != null) {
+            linkMap.put(link.getLinkId(), link);
+        }
+    }
+
+    @Override
+    public boolean removeLink(LinkId link) {
+        return linkMap.remove(link) != null;
+    }
+
+    @Override
+    public RnibLink getLink(ECGI ecgi, MMEUES1APID mme) {
+        LinkId linkId = new LinkId(ecgi, mme);
+        return linkMap.get(linkId);
+    }
+
+    @Override
+    public List<Object> getNodes() {
+        List<Object> list = Lists.newArrayList();
+        list.add(cellMap.values());
+        list.add(ueMap.values());
+        return list;
+    }
+
+    @Override
+    public List<RnibCell> getCellNodes() {
+        List<RnibCell> list = Lists.newArrayList();
+        list.addAll(cellMap.values());
+        return list;
+    }
+
+    @Override
+    public List<RnibUe> getUeNodes() {
+        List<RnibUe> list = Lists.newArrayList();
+        list.addAll(ueMap.values());
+        return list;
+    }
+
+    @Override
+    public Object getByNodeId(String nodeId) {
+        try {
+            return getCell(nodeId);
+        } catch (Exception e) {
+
+        }
+        return getUe(Long.parseLong(nodeId));
+    }
+
+    @Override
+    public void storeCell(RnibCell cell) {
+        if (cell.getEcgi() != null) {
+            cellMap.putIfAbsent(cell.getEcgi(), cell);
+        }
+    }
+
+    @Override
+    public boolean removeCell(ECGI ecgi) {
+        return cellMap.remove(ecgi) != null;
+    }
+
+    @Override
+    public RnibCell getCell(String hexeci) {
+        EUTRANCellIdentifier eci = hexToECI(hexeci);
+        Optional<ECGI> first = cellMap.keySet().stream().filter(ecgi -> ecgi.getEUTRANcellIdentifier().equals(eci)).findFirst();
+        return first.map(ecgi -> cellMap.get(ecgi)).orElse(null);
+    }
+
+    @Override
+    public RnibCell getCell(ECGI ecgi) {
+        return cellMap.get(ecgi);
+    }
+
+    @Override
+    public boolean modifyCellRrmConf(String hexeci, JsonNode rrmConf) {
+        EUTRANCellIdentifier eci = hexToECI(hexeci);
+        Optional<ECGI> first = cellMap.keySet().stream().filter(ecgi -> ecgi.getEUTRANcellIdentifier().equals(eci)).findFirst();
+        first.ifPresent(ecgi -> cellMap.get(ecgi).modifyRrmConfig(rrmConf));
+        return false;
+    }
+
+    @Override
+    public RnibSlice getSlice(long sliceId) {
+        if (sliceMap.containsKey(sliceId)) {
+            return sliceMap.get(sliceId);
+        }
+        return null;
+    }
+
+    @Override
+    public boolean createSlice(ObjectNode attributes) {
+        return false;
+    }
+
+    @Override
+    public boolean removeCell(long sliceId) {
+        return sliceMap.remove(sliceId) != null;
+    }
+
+    @Override
+    public XranController getController() {
+        return controller;
+    }
+
+    @Override
+    public void setController(XranController controller) {
+        this.controller = controller;
+    }
+
+    @Override
+    public void storeUe(RnibUe ue) {
+        if (ue.getMmeS1apId() != null) {
+            ueMap.putIfAbsent(ue.getMmeS1apId(), ue);
+        }
+    }
+
+    @Override
+    public boolean removeUe(MMEUES1APID mme) {
+        return ueMap.remove(mme) != null;
+    }
+
+    @Override
+    public RnibUe getUe(long euId) {
+        MMEUES1APID mme = new MMEUES1APID(euId);
+        return ueMap.get(mme);
+    }
+
+    @Override
+    public RnibUe getUe(MMEUES1APID mme) {
+        return ueMap.get(mme);
+    }
+
+    private EUTRANCellIdentifier hexToECI(String eciHex) {
+        byte[] hexBinary = DatatypeConverter.parseHexBinary(eciHex);
+        return new EUTRANCellIdentifier(hexBinary, 28);
+    }
+}