rules for routing IP packets over LTE or Wi-Fi interfaces. The mobile uses these rules when it cannot access both interfaces simultaneously. Figure 10.2 describes the structure of the managed objects (MO) for the ISMP. Policy RulePriority PrioritizedAccess AccessTechnology / AccessId / SecondaryAccessIo / AccessNetworkPriority ValidityArea 3GPP_Location PLMN / TAC / LAC / GERAN_CI/UTRAN_CI/EUTRA_O 3GPP2_Location SID / NID / Base ID Sector ID / Netmask WIMAX_Location NAP ID / BS ID WLAN_Location HESSID / SSID / BSSID AnchorLatitude Geo_Location Circular AnchorLongitude Radius ValidityAreaRef Roaming TimeOfDay TimeStart / TimeStop / DateStart / DateStop / DateOfWeek TimeOfDayRef UpdatePolicy Figure 10.2. ISMP policy Wi-Fi Integration to the 4G Mobile Network Each ISMP rule includes the following information: - the conditions that indicate when the rule is valid. These conditions may include, for example, a duration or a location area; - a priority list of access technologies that indicates the order in which they are preferred or restricted for the connectivity to the evolved packet core (EPC); - a rule priority that indicates the priority of this rule over other ISMP rules provided by the same 4G mobile network. 10.1.1.3. ISRP The inter-system routing policy (ISRP) is a set of operator-defined rules that determine how the mobile should route traffic across multiple radio access interfaces. The IFOM (IP Flow Mobility) rules identify a prioritized list of radio access technologies that should be used by the mobile to route the different IP packets of a PDN connection that corresponds to an access point name (APN). As the PDN connection is anchored in the EPC network, mobility for each IP flow is provided between LTE and Wi-Fi accesses. Figure 10.3 describes the structure of managed objects (MO) for IFOM rules. ForFlowBased IPFlow App_ID OSApps OSAppId AddressType/StartSourceIPAddress/EndSourceIPAddress / ProtocolTyp StartSourcePortNumber /EndSourcePortNumber StartDestAddress/EndDestAddress StartDestPortNumber/EndDes