Transcript Serving IP Mobility with HiperLAN/2 Arndt Kadelka *, Erkan

EU Project BRAIN
Handover in the IP-based Radio Access Network
Arndt Kadelka
Aachen University of Technology, ComNets, Germany
Mobility Concept investigated in European BRAIN Project
- Serving Global and Local IP Mobility
- Performance of HiperLAN/2 Handover Procedures
- Integration of HiperLAN/2 Mobility and Local IP Mobility
-
BRAIN System Concept using HiperLAN/2-based Access
Other Networks
IP Backbone
UTRAN
Supports:
Node B
SGSN
Node B
IP WAN
RNC
- QoS for realtime services
- Multicast
- Handover
BRAIN Radio Cells
BRAIN Radio Cells
Horizontal
Handover
Serving Local and Global Mobility

Hierarchical Mobility
 Mobility across Wireless Access Networks served by rather slow Mobile IP
 Mobility within Wireless Access Network served by fast protocols, e.g., Cellular IP,
HAWAII
Local Handover within Access Network – Cellular IP
T itel:
Cell IPHandover.eps
Erstel lt von:
fi g2dev Versi on 3.2 Patc hlevel 3c
Vors c hau:
Dies e EPS-Grafik wurde nic ht ges peic hert
mit einer enthal tenen Vorsc hau.
Kommentar:
Dies e EPS-Grafik wi rd an einen
Pos tScri pt-Druc ker gedruckt, aber nic ht
an andere Druc kertypen.

Route update by Uplink IP packets sent hop-by-hop to Gateway Router
HiperLAN/2-based Radio Access
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Radio access can be
adapted to various
networks
BRAIN: IP Conv. Layer
Operates in the license
exempt spectrum in
5-6 GHz band
Radio cells up to 200 m
25 Mbit/s typical data rate
Actions to Perform a handover
In H/2 fast handover decision and execution is performed by the
MTs:
1. Scanning for alternative channel, i.e., served by different APT
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MT indicates absence to serving AP, AP stops data transmission
MT performs measurements on alternative channel(s)
MT may return to serving AP or perform a handover
2. Handover decision
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MT decides to perform a handover based on RSSI and PER measurements
Hysteresis to avoid ping-pong-effects
3. Handover execution
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MT may indicate handover intention to serving AP
MT initiates handover by Handover_Request to target APT, i.e, forward
handover
Re-establishment of link layer communication
Scanning Period
Packet Transmission Delay owing to Scanning
Downlink Transmission
Amount of data effected by scanning:
Uplink Transmission
tabsent
t present  tabsent
Handover within H/2 Radio Access Network
T itel:
HL_2_Subnetze_quer.eps
Erstel lt von:
fi g2dev Versi on 3.2 Patc hlevel 3c
Vors c hau:
Dies e EPS-Grafik wurde nic ht ges peic hert
mit einer enthal tenen Vorsc hau.
Kommentar:
Dies e EPS-Grafik wi rd an einen
Pos tScri pt-Druc ker gedruckt, aber nic ht
an andere Druc kertypen.

Radio HO performed within DLC
 IP layer not involved

Inter-Subnet Network Handover involves also IP layer
 Route update of IP routing tables
Radio Handover Execution
T itel:
NormalAndRadio_fertig2.eps
Erstel lt von:
fi g2dev Versi on 3.2 Patc hlevel 3c
Vors c hau:
Dies e EPS-Grafik wurde nic ht ges peichert
mit einer enthal tenen Vorsc hau.
Kommentar:
Dies e EPS-Grafik wi rd an einen
Pos tScri pt-Druc ker gedruckt, aber nic ht
an andere Druc kertypen.
Serving Local Mobility with H/2

Changing point of attachment to the network
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Re-establishment of link layer communication
via the air interface
 Re-registration to the IP network
 Authentication
 Maintaining on-going DLC connections

Integration with IP mobility via IP CL
Slow Network Handover Procedure
T itel:
WorstCase_NW_HO_procd.eps
Erstel lt von:
fi g2dev Versi on 3.2 Patc hlevel 3c
Vors c hau:
Dies e EPS-Grafik wurde nic ht ges peic hert
mit einer enthal tenen Vorsc hau.
Kommentar:
Dies e EPS-Grafik wi rd an einen
Pos tScript-Druc ker gedruckt, aber nic ht
an andere Druc kertypen.

Interworking with Cellular IP
 IP CL triggers route update packet

Loss of IP packets received at APold
before route update execution
Analysis of Slow Network Handover
Packet Loss during Slow Network Handover
Fast Network Handover with Backbone Signaling
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Information about on-going DLC connections retrieved via
backbone
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Packets routed to APold are tunneled to APnew
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DLC address of APold is indicated during HO_Association

AP has to maintain address mapping table
 APold DLC  IP address
Fast Network Handover Procedure
T itel:
Bes tCas e_NW_HO_proc d.eps
Erstel lt von:
fi g2dev Versi on 3.2 Patc hlevel 3c
Vors c hau:
Dies e EPS-Grafik wurde nic ht ges peic hert
mit einer enthal tenen Vorsc hau.
Kommentar:
Dies e EPS-Grafik wi rd an einen
Pos tScri pt-Druc ker gedruckt, aber nic ht
an andere Druc kertypen.
Analysis of Fast Network Handover
Making use of Slow and Fast Network Handover
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To make best use of Fast Network Handover procedure IP
address of old AP must be known
Mapping table may be set up
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
manually, by operation and maintenance procedures
 administration effort
 not flexible
dynamically, by following procedure
1. AP selects handover procedure to be executed, i.e., Slow or Fast Network
Handover
2. MT performing 1st Handover from APold to Apnew carries out Slow Network
Handover and provides DLC address (during HO_Association) and IP
address of Apold (via Info_Transfer)
3. Stores DLC/IP-address mapping
4. Subsequent handovers from this APold are performed according Fast
Handover procedure
Conclusion
H/2 defines handover procedures to serve local mobility
 For H/2 mobility integration with IP local mobility interworking
functions are investigated and defined for the new IP CL
 To perform network handover involving the IP network almost as
fast as radio handover address mapping table has to be
maintained in IPCL
 Procedure defined to set up the mapping table dynamically

 Work
will be continued in follow-up project MIND
Specification of IPCL and contribution to ETSI/BRAN
Mobility integration with UMTS (Vertical Handover)