Failure Recovery of HLR Mobility Databases and Parameter Optimization for PCS Networks

This paper studies checkpointing and failure restoration of mobility database for Universal Mobile Telecommunications System (UMTS). By utilizing per-user checkpointing technique, individual Home Location Register (HLR) records are saved into non-volatile backup storage form time to time. When a failure occurs, the backup record is restored back to the mobility database. We consider three per-user checkpoint schemes for the HLR. An analytic model is developed to investigate these schemes in terms of the probability that a HLR backup record is obsolete and the expected checkpoint interval. This model is validated against simulation experiments. Our study provides guidelines for selecting an appropriate checkpoint scheme and parameters for various traffic conditions.

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“…Scheme I is a basic scheme widely used in UMTS checkpointing [3], [4], which is described as follows. Scheme I.…”

Section: Per-user Checkpoint Schemesmentioning

confidence: 99%

Modeling mobility database failure restoration using checkpoint schemes

Sou

Lin

2007

IEEE Trans. Wireless Commun.

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“…Updating the service information is done infrequently since most subscribers rarely change their service profiles after subscription, and the immediate backup update operations do not cost too much. After an HLR failure, the data in the backup are reloaded into the HLR [7], [13].…”

Section: Gpp Failure Restorationmentioning

confidence: 99%

Broadcast Approach for UMTS Mobility Database Recovery

Sou

Lin

2007

IEEE Trans. on Mobile Comput.

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The Universal Mobile Telecommunications System (UMTS) provides high bandwidth packet data services to mobile users. To support mobility management, an MM context is established for every mobile station in its corresponding Serving GPRS Support Node (SGSN). When the SGSN fails, all MM contexts in the SGSN are corrupted. These MM contexts must be recovered or data delivery to the mobile stations will fail. This paper describes a broadcast approach that allows the MS to detect lost MM context in SGSN and therefore speeds up the process for SGSN recovery. We propose an analytic model to evaluate the performance of the broadcast approach. The analytic model is validated against simulation experiments. Based on our study, the network operator can select the appropriate parameter values in the broadcast approach for various traffic conditions.

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“…Details of mobility management and call setup procedures can be found in Reference [15]. Many studies have focused on issues regarding normal mobile registration/call setup [14,33] and failure restoration [16,17]. We will describe some advanced core network mobility issues in Section 3.…”

Section: Impact Of Mobility On the Core Networkmentioning

confidence: 99%

Impact of mobility on mobile telecommunications networks

Lin

Pang

Rao

2005

Wirel. Commun. Mob. Comput.

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This paper describes the mobility management mechanisms for mobile telecommunications networks. There are two major types of mobility: radio network mobility and core network mobility. Radio network mobility supports radio link switching of a mobile user during conversation, and core network mobility provides roaming and tunnelrelated management for packet re-routing due to user movement. Impact of mobility on both the radio and the core networks is addressed in this paper. Also, potential research issues on these topics are discussed.

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Failure Recovery of HLR Mobility Databases and Parameter Optimization for PCS Networks

Cited by 8 publications

References 20 publications

Modeling mobility database failure restoration using checkpoint schemes

Modeling mobility database failure restoration using checkpoint schemes

Broadcast Approach for UMTS Mobility Database Recovery

Impact of mobility on mobile telecommunications networks

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