Data replication in mobile tactical networks

Abstract

Abstract-In tactical networks, nodes move according to tactical maneuvers and network partitions occur frequently. To mitigate this problem, data replication is commonly used to increase data availability and reduce data access delay. However, different tactical maneuvers lead to different node mobility models, which affect the performance of data replication schemes. In this paper, we comprehensively study the data replication problem in mobile tactical networks. We propose a new intra-group data replication scheme and extensively quantify the effects of mobility on different inter-group data replication schemes from various perspectives. The study is based on several metrics, which include the average access delay and data availability, and the temporal and spatial analysis of these values. Through extensive experiments, we study the effects of three typical mobility models in tactical networks on data replication, and identify the most suitable data replication schemes under various mobility models.

Metric driven mobility modeling in tactical networks

“…We further compare the results obtained with our military scenarios, described by Zhang et al, 16 to those obtained when conventional mobility models are used with the same replication schemes, presented by Zhang et al 15 4.3.1 Average delay and average availability. The results for average data access delay and average data availability are presented in Tables 3 and 4.…”

“…For the curve-fitting model, outage time is calculated using Equation (16). The bar chart in Figure 14 schematically represents the values of outage time obtained from each model in all three cases…”

“…Zhang et al 16 present the novel Best Location Intra-Group Data Replication algorithm, which optimizes data access within a group by finding the 'best' node to store each data replica such that cost of data access, as well as degree of data redundancy, within the group is minimized. This is done by computing the following quantities: a.…”

Cache invalidation strategies for Internet-based vehicular ad hoc networks

“…Since frequently accessed data items (i.e., hot data items) are highly preferred to be cached, a non-uniform data access pat tern is implicitly assumed in most caching schemes. If the data ac cess pattern is uniform (i.e., h = 0.0), the benefits of caching in NC PER EAS CCI ECCI Also the problem of data caching can be turned into data replica tion [20,36], where multiple copies of data item are stored in local caches and a performance tradeoff between data accessibility and access latency is a major performance matrix.…”

Crowdsourcing: Dynamic Data Management in Mobile P2P Networks

“…More recently, replication and caching have been discussed in mobile environments such as disruption tolerant networks [32], mobile tactical networks [33] as well as in opportunistic mobile networks [31].…”