Handover Management In Integrated Wlan And Mobile WimaxPresentation Transcript
HANDOVER MANAGEMENT IN INTEGRATED WLAN AND MOBILE WIMAX NETWORKS Pradeep Thomas Thundiyil M.Tech 2nd Sem DCN 1
OverviewWLAN and WMAN: Integration.Mobility Management and Integration Solutions For Heterogeneous All-IP Wireless Networks. Mixed Network Client Use Case.Handover Between WIMAX and WIFIUsing MIH Framework. 2
Types of Handovers Homogeneous (Horizontal) Handovers Within Single Network (Localized Mobility) Limited opportunities Heterogeneous (Vertical) Handovers Across Different Networks (Global Mobility) More Opportunistic IEEE 802.21 is primarily for Vertical Handovers ….can also be used for Homogeneous Handovers 6
Overview WLAN and WMAN: Integration.Mobility Management and Integration Solutions For Heterogeneous All-IP Wireless Networks. Mixed Network Client Use Case.Handover Between WIMAX and WIFIUsing MIH Framework. 7
Mobility Management MIP provides a new IP address to a mobile node as it moves to a new network. 9 IETF Solutions: Upper Layer Protocols In MIPv4 the correspondent node (CN) sends packet to the MN through the MN’s HA – longer route. MIPv6 allows CN to send packets directly to the FA at the visited network – reduced delay. In L3 Handover the disruption due to long delays is minimized using Fast handover MIP (FMIP).
IETF Solutions: Upper Layer Protocols Network Layer MIP Transport Layer mSCTP Application Layer SIP SIP is an application layer signaling protocol: Widely used for setting up and tearing down multimedia sessions. 10
3GPP Solutions 3GPP defined a mobility management scheme based on IMS. VCC/IMS integrates UMTS and unlicensed spectrum technologies (Wi-Fi). SAE/LTE System Architecture Evolution/ Long term Evolution (efficient Vertical Handover). 11
12 Transfer Connection Setup New Link Search New Link Handover Signaling Packet Reception Network Discovery Network Selection Handover Negotiation Layer 2 Connectivity IP Connectivity Scope of 802.21 Handover Execution Handover Initiation Handover Preparation IEEE 802.21 helps with Handover Initiation, Network Selection and Interface Activation
13 What IEEE 802.21Defines
The current specification includes a Media Independent Handover Function (MIHF) consisting of three basic services
Media Independent Event Service (MIES)
Media Independent Command Service (MICS), and
Media Independent Information Service (MIIS)
MIH aims to help and enhance the operation of mobility management protocols.
14 What is Media Independent Handover ? Media Independent Handover Services is an IEEE (802.21) working on a specification that facilitates handover optimization between heterogeneous access networks by providing Link layer intelligence and Network information to upper layers Support for multiple access technologies (e.g., IEEE and non-IEEE access technology) Support for both network and device initiated handovers
Media Independent Event Service (MIES) Events may originate from MAC, PHY or MIH Function either at the mobile node or at the network. The source of these events may be either local or remote. Two types of Event Service Link Events and MIH Events. 15 MIH User (L3 and above) MIH Event s MIHF Link Event s Lower Layers (L2 and below)
16 MIH Events 16
17 MIH Users (L3 and above) MIH Commands MIHF Link Commands Lower Layers (L2 and below) Media Independent Command Service (MICS)
Media Independent Command Service refers to the commands sent from the higher layers to the lower layers in the reference model
Two types of Command Service
MIH Commands 18
19 IEEE 802.21 Standard - Media Independent Handover (MIH) framework
Overview WLAN and WMAN: Integration.Mobility Management and Integration Solutions For Heterogeneous All-IP Wireless Networks.Mixed Network Client Use Case.Handover Between WIMAX and WIFIUsing MIH Framework. 20
21 Radio State Radio State Radio State Radio State 3G WWAN 3G WWAN 3G WWAN 3G WWAN Wi-Fi Wi-Fi Wi-Fi Wi-Fi WiMAX WiMAX WiMAX WiMAX GPS GPS GPS GPS Radio State Radio State Radio State 3G WWAN 3G WWAN 3G WWAN Wi-Fi Wi-Fi Wi-Fi WiMAX WiMAX WiMAX GPS GPS GPS MxN – Mixed-Network Client Use Case 3G WWAN Operating on 3G WWAN Zone 1 Zone 2 Zone 3 Plug into power jack Wakeup Wi-Fi Continue over Wi-Fi Wakeup Wi-Fi Zone 6 Zone 5 Zone 4 Airport Wi-Fi Link Going Down. Connect to Wi-Fi Home Continue session on 3G WWAN Continue session on Wi-Fi Battery level low Shutdown WiMAX Switch to 3G WWAN Operator initiated switch to WiMAX Continue session on WiMAX Shutdown Wi-Fi WiMAX WiMAX Zone 7 Zone 9 Zone 8 VCC, SIP, IMS for Call Continuity (3G WWAN Wi-Fi) IEEE 802.21 for Network Discovery IEEE 802.21, SIP, VCC, IMS, for Network Selection and Service Continuity across multiple radios (3G WWAN Wi-Fi WiMAX) 802.21, SIP, IMS for Service Continuity (Wi-Fi WiMAX)
OverviewWLAN and WMAN: Integration.Mobility Management and Integration Solutions For Heterogeneous All-IP Wireless Networks. Mixed Network Client Use Case.Handover Between WIMAX and WIFIUsing MIH Framework. 22
Always best connected scenario: WiMAX/WiFi handover using the MIH framework. MobileNode Current WiMAX BS Candidate Wi-FI AP Candidate Wi-Fi AP MIIS MN becomes aware of new connectivity opportunities through beacons received from candidate APs. Alternatively, it can also periodically query the MIIS to gather information on available access networks. 1 MIH_Get_Information Request MIH_Get_Information Response MIH_N2N_HO_Candidate_Query Request MIH_N2N_HO_Query_Resource Request 2 MIH_N2N_HO_Query_Resource Request 3 MIH_N2N_HO_Query_Resource Response 24 MIH_N2N_HO_Candidate_Query Request
Always best connected scenario: WiMAX/WiFi handover using the MIH framework. Mobile Node Current WiMAX BS Candidate Wi-FI AP Candidate Wi-Fi AP MIIS Handover decision based on resource availability and user’s preferences. Selection of the target network. 4 MIH_MN_Handover_Commitrequest MIH_N2N_Handover_Commit Request MIH_N2N_Handover_Commit Response MIH_MN_Handover_Commit response (FMIPv6) HAck, FBAck (Wi-FI) ASSOCIATION PROCEDURE (WiMAX) DISSASSOCIATION_PROCEDURE MIH_MN_Handover_Complete Request MIHMN_Handover_Complete Response
Conclusion & Future Directions
The integration of heterogeneous networks seems to be a good approach in order to offer the 4G always best connected vision.
The use of the MIH framework for integrating WiFi and WiMAX networks provides seamless handover.
MIH support for multihop heterogeneous networks, QoS mapping, and resource allocation mechanisms for WLAN/WMAN integrated networks, and security solutions are to be improved. 26
References G. Lampropoulos, A. Salkintzis, and N. Passas, “Media Independent Handover for Seamless Service Provision in Heterogeneous Networks,” IEEE Commun. Mag., vol. 46, no. 1, Jan. 2008.
Kejie Lu, Yi Qian, Hsiao-Hwa Chen, “ A Secure and Service-Oriented Network Control Framework for WiMAX Networks,” IEEE Communications Magazine, May 2007.
Ian F Amine M. Houyou, Hermann De Meer, Moritz Esterhazy, “P2P-based Mobility Management for Heterogeneous Wireless Networks and Mesh Networks”. 27