David Lynn Presents…

HANDOVER IN MOBILE WIMAX NETWORKS: THE STATE OF ART AND RESEARCH ISSUES

Sayan Kumar Ray

Krzysztof Pawlikowski

Harsha Sirisena

HARD HANDOVERS

•Acquisition Phase• BS advertises the Network Topology• Scanning of advertised neighboring BSs and MS• Ranging and Optional Association Activates

•Actual Handover Phase• Deciding on the TBS• Initiating the Handover• TBS synchronization and Ranging Process• Authorization and Registration Phase

FAST BASE STATION SWITCHING HANDOVERS

• Diversity Set Updating• Updating and Selecting the new ABS• Handover Occurrence

RESEARCH ISSUES: LAYER 2 HANDOVER ISSUES

Excessive Scanning and Associating

Activates

Optimizing Scanning Interval

Efficient Exploitation of DL and UL Signals

Wastage of Ranging Slots

Prolonged Handover Connection

Disruption Time

Network Re-Entry Activity due to Ping

Pong Effects

IP Connectivity Delay during

Network Re-entry

Optimizing Handover-based Load Distribution

http://www.integration1.com.au/NetSecScanInfo.htm

http://chaka4612.blogspot.com/2011/11/family-time-and-ping-pong.htmlhttp://www.playslots.org.uk/http://science.howstuffworks.com/apollo-spacecraft7.htm

http://www.winnersedgetrading.com/forex-signal-gbpusd/http://directorblue.blogspot.com/2008/12/importance-of-load-distribution.html http://cnx.org/content/m13596/latest/

RESEARCH ISSUES: LAYER 2 HANDOVER SOLUTIONS

Select the potential TBS before the scanning

operations.

NBSs can exchange configuration parameters.

MS’s uplink signal strengths and SBS’s

downlink signal strengths.

Selection of the TBS prior to the handover

preregistration phase.

MAC management message can enable the

MS to receive traffic immediately after the

handover.

Traffic for MS will remain buffered in the SBS for a

set amount of time.

TBS know the MS’s previous AR and the IP

address.

BS-initiated directed handovers and MS-

initiated rescue handovers are conducted

in parallel.

RESEARCH ISSUES: LAYER 3 HANDOVER ISSUES

Large L3 Handover Latency

MAC State MigrationProblem

Interworking with MIPv6

http://applewallpapers.net/view/mac_os_wallpaper-1440x900.htmlhttp://capitalmarketalerts.com/living-with-no-growth/slow-road-sign-378px/http://anchorsholme.org.uk/2012/01/2580/hand-over-keys/

RESEARCH ISSUES: LAYER 3 HANDOVER SOLUTIONS

Timely indication of organized L2 triggers.

Serving network can buffer the IP packets meant for the MS to reset the lost MAC

frames.

FMIPv6, HMIPv6 and PMIPv6.

RESEARCH ISSUES: LAYER 2&3 HANDOVER ISSUES & SOLUTIONS

Explicit HO Notification to Upper Layers

Imprecise L2 Triggers Seamless Integration of L2 and L3 Mobility

Management Messages

Two-Way Cross-Layer Handover Information

Flow

http://news.softpedia.com/newsImage/Imprecise-Chips-Could-Revolutionize-Electronics-2.jpg/http://hackbymak.blogspot.com/2012/02/get-notification-when-any-program.htmlhttp://dna-of-humancapital.blogspot.com/2011/03/end-of-managementlong-live-management.htmlhttp://www.nowpublic.com/environment/massive-river-flow-through-arctic

Explicit L2 to L3 event triggers during the

various stages of the overall MWiMAX HO

activity.

Send the L2-HO trigger early enough to the upper layers in the

form of predicted RSSI values.

Removal of related HO management messages

from both the MWiMAX L2 and L3

HO.

Multiple event and command services to improve the FMIPv6 HO support over the

MWIMAX MAC.