n Request to request the AP to modify the specific bearer resources. 2) If the access point accepts the request, it applies the configuration modification to the resource and responds with the message Xw-AP WT Modification Request Acknowledge. Carrier Aggregation 3) If the modification requires a new configuration for the mobile, the eNB entity sends the message RRC ConnectionReconfiguration, including the new configuration of the Wi-Fi radio resource. 4) The mobile applies the new configuration and responds with the message RRC ConnectionReconfigurationComplete The WT Modification procedure initiated by the access point is described in Figure 11.7. 1) The access point sends the message Xw-AP WT Modification Required to the eNB entity to modify the radio resources of the Wi-Fi access. 2) The eNB responds with the message Xw-AP WT Change Confirm. 3) If the modification requires a new configuration for the mobile, the eNB entity sends the message RRC ConnectionReconfiguration, including the new configuration of the Wi-Fi radio resource. 4) The mobile applies the new configuration and responds with the message RRC ConnectionReconfigurationComplete Xw-AP WT Modification Required Xw-AP WT Modification Confirm RRC ConnectionReconfiguration RRC ConnectionReconfigurationComplete Figure 11.7. WT Modification procedure initiated by the access point 11.3.1.3. WT Release procedure The WT Release procedure can be initialized either by the NB entity or by the access point and is used to initiate the release of the mobile context at the access point. The recipient cannot reject the request. 210 Wi-Fi Integration to the 4G Mobile Network The WT Release procedure initiated by the eNB entity is described in Figure 11.8. 1) The eNB entity sends the message Xw-AP WT Release Request to request the Wi-Fi access point to release the allocated radio resources over the Wi-Fi access. 2) If necessary, the eNB entity sends the message RRC ConnectionReconfiguration to the mobile indicating the release of the radio resources. 3) The mobile re