Download presentation
Presentation is loading. Please wait.
Published byKarley Leadbetter Modified over 10 years ago
2
Mobility Management in Packet- based Communication Networks Yun Won Chung Electronics and Telecommunications Research Institute E-mail: ywchung@ieee.org
3
2 Contents Introduction Mobility management in circuit-based communication networks Mobility management in packet-based communication networks Mobility management in all-IP networks Further studies
4
3 Introduction Mobility management Location management Location update (registration) Call delivery Handoff management Tradeoff between location update and call delivery Signaling load analysis Resolution of location information (i.e., cell, location area, service area)
5
Mobility Management in Circuit- based Communication Networks
6
5 Location Management Location update Call delivery
7
6 Network Service Area in 2G Systems * source: reference [1]
8
7 Location Registration and Call Delivery Centralized database architecture Dynamic hierarchical architecture Per-user location caching User profile replication Pointer forwarding Local anchoring Distributed database architecture A fully distributed registration scheme Partitioning Database hierarchy
9
8 Location Update and Terminal Paging Location update schemes Dynamic LA management Three dynamic update schemes Time-based Movement-based Distance-based Terminal paging schemes Paging under delay constraints Update and paging under delay constraints
10
Mobility Management in Packet- based Communication Networks
11
10 Mobile Station State In circuit-based communication networks MT is in idle or busy state In packet-based communication networks MS is in Idle, ready, or standby state in GPRS UE is in PMM-detached, PMM-idle, cell-connected, or URA- connected state in UMTS Cell, URA, RA, or LA is the unit area for location update Frequency of location update and paging depend on the state of MS or UE Effect of timer (i.e. ready timer, inactivity timer, etc.) is important
12
11 Network Service Area in GPRS * source: reference [1]
13
12 GPRS MS State Model Idle MS is not reachable After attach, the MS moves to ready state Ready Packet transmission is possible Cell-based location update is performed Ready state can be sub- divided into ready(off) and ready(on) Standby RA-based location update is performed
14
13 URAs, RAs, and LAs in UMTS * source: reference [2]
15
14 UMTS UE State Model MM state model in SGSN RRC state model in UTRAN
16
15 UMTS UE MM and RRC States MM state PMM detached UE is not reachable PMM connected Packet switched (PS) signaling connection is established Serving RNC id is stored Cell-connected or URA-connected PMM idle PS signaling connection is released Only RA information is stored RRC state Idle No RRC connection Cell connected Cell level location information is managed Stays until inactivity timer expires URA connected URA level location information is managed
17
16 Research on the Analysis of MS State Yun Won Chung, Dan Keun Sung, and A. Hamid Aghvami, “Steady State Analysis of Mobile Station State Transitions for General Packet Radio Service,” in Proc. PIMRC’2002, pp. 2029 – 2033, Lisbon, Portugal, 2002 Yun Won Chung, Dan Keun Sung, and A. Hamid Aghvami, “Steady State Analysis of User Equipment State Transitions for Universal Mobile Telecommunications Systems,” in Proc. PIMRC’2002, pp. 2034 – 2038, Lisbon, Portugal, 2002 Yun Won Chung and Dan Keun Sung, “Modeling and analysis of combined mobility management and implicit cell update scheme in General Packet Radio Service,” in Proc. VTC’2003 Spring, Jeju, Korea, 2003
18
17 Analysis of GPRS MS State Location update & paging in GPRS Cell in ready state RA in standby state Location update and paging frequencies depend on the state of MS Tradeoff between location update and paging signaling based on the number of cells in an RA Derivation of steady state probability of MS Performance analysis using steady state probability
19
18 Modified MS State Model Exit from Idle Ready(off) by Attach (T 12 ) Exit from Ready(off) Idle by detach (T 21 ) Ready(on) by packet session arrival (T 23 ) Standby by ready timer expiry (T 24 ) Exit from Ready(on) Idle by Detach (T 31 ) Ready(off) by completion of session processing (T 32 ) Exit form Standby Idle by Detach (T 41 ) Ready(off) by RA update due to movement or RA update timer expiration (T 42 ) Ready(on) by packet session arrival (T 43 )
20
19 Steady State Probability Stationary probability Steady state probability
21
20 Numerical Example P 1 : idle P 2 : ready(off) P 3 : ready(on) P 4 : standby
22
21 Analysis of UMTS UE State Location update & paging in UMTS Cell in cell-connected state URA in URA-connected state RA in PMM-idle state Location update and paging frequencies depend on the state of UE Derivation of steady state probability of UE Performance analysis using steady state probability
23
22 Modified UE State Model Exit from PMM detached Cell connected (off) by attach (T 12 ) Exit from Cell connected (off) PMM detached by detach (T 21 ) Cell connected (on) by packet session arrival (T 23 ) URA connected by inactivity timer expiry (T 24 ) Exit from Cell connected (on) PMM detached by detach (T 31 ) Cell connected (off) by completion of session processing (T 32 ) Exit form URA connected PMM detached by detach (T 41 ) Cell connected (off) by URA update (T 42 ) Cell connected (on) by packet session arrival (T 43 ) PMM idle by URA update timer expiration (T 45 ) Exit from PMM idle Detach request (T 51 ) RA update due to movement of a UE or expiration of an RA update timer (T 52 ) Incoming or outgoing session arrival (T 53 )
24
23 Numerical Example P 1 : PMM detached P 2 : cell connected(off) P 3 : cell connected(on) P 4 : URA connected P 5 : PMM idle
25
24 Combined Mobility Management * source: reference [1]
26
25 Combined Mobility Management Location Update Based on LA in GSM Based on cell or RA in GPRS Size of LA > size of RA Paging Based on paging area (= LA or RA) Combined Mobility Management Class-A mode MS Attached to both GSM and GPRS Supports simultaneous operation of GPRS and GSM services Gs interface between SGSN and MSC/VLR Combined RA/LA update using one radio signaling message Circuit-switched paging via SGSN to either RA or cell based on a GPRS MS state Efficient management of GSM/GPRS MM
27
26 Combined Mobility Management Implicit cell update The location of MS is known to network if GSM MS is in busy state How can we utilize this cell-based location information for Class-A GPRS MS state management? After the implicit cell update, paging only one cell may be sufficient for call or packet delivery if the cell location is managed A new MS state model Incorporation of GSM MS state into GPRS MS state Ready state can be sub-divided into ready(off), ready(on)- GSM, ready(on)-GPRS, ready(on)-GSM/GPRS
28
27 Modified MS State Model
29
28 Numerical Examples
30
Mobility Management in All-IP Networks
31
30 Micro-Mobility Protocols Cellular IP HAWAII Regional registration Hierarchical Mobile IP Fast handoff
32
31 Seamoby Activities RFC 2132: dormant mode host alerting (“IP paging”) problem statement RFC 3154: requirements and functional architecture for an IP host alerting protocol MH state Active Dormant Functional entities Paging agent Tracking agent Dormant monitoring agent
33
32 Motivation of IP Paging Consider an MH, which is moving fast and is not involved in a communication Bandwidth consumption Processing power Protocol states Optimization for nodes that are currently not in a session might be taken into consideration Entering dormant mode Avoids frequent location update Decreases the preciseness of the network’s knowledge about individual mobile’s location to paging areas Dormant mode supports saving scarce radio bandwidth cutting superfluous location updating reducing battery energy drainage
34
33 P-MIP (an Idle MN ’ s Movement) HA Reg request Reg reply FA MN PA1 PA2 * source: reference [3]
35
34 P-MIP (Page an Idle MN) HA FA MN CN data paging reg * source: reference [3]
36
35 Analysis of P-MIP MS State Yun Won Chung, Dan Keun Sung, and A. Hamid Aghvami, “Steady State Analysis of P-MIP Mobility Management,” IEEE Communications Letters, June 2003 P-MIP MS State Active Idle
37
36 Numerical Examples
38
37 Further Studies Multicast accommodating host mobility Power saving MM algorithm Vertical handoff Mobility support in WLAN Network mobility Integrated MM in heterogeneous all-IP networks
39
38 References 1.Brahim Ghribi and Luigi Logrippo, “Understanding GPRS: the GSM packet radio service,” Computer Networks, vol. 34, pp. 763-779, 2000. 2.Yi-Bing Lin, Yieh-Ran Haung, Yuan-Kai Chen, and Imrich Chlamtac, “Mobility management: from GPRS to UMTS,” Wireless Communications and Mobile Computing, vol. 1, pp. 339-359, 2001. 3.Xiaowei Zhang, “Paging in Mobile IP”, presentation material on the 4th International Workshop on Wireless Mobile Multimedia, Rome, Italy, July 2001, http://www.comet.columbia.edu/~xzhang/pmip/ 4.I. F. Akyildiz, et al., Mobility management in next-generation systems, Proceedings of the IEEE, vol. 87, no. 8, Aug. pp. 1347 – 1384, 1999.
40
39 Any Questions & Comments ?
Similar presentations
© 2025 SlidePlayer.com. Inc.
All rights reserved.