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On Finding the Multicast Protection Tree Considering SRLG in WDM Optical Networks
Yonggang Li,Yaohui Jin,Lemin Li,Longjiang Li 한국전자통신연구원 2006 ETRI Journal Vol.28 No.4
In this letter, a new sharing mechanism, SRLG sharing, is proposed, which allows the links of the same shared risk link group (SRLG) in a primary light tree to share protections in WDM optical networks. In previous studies, how to share spare resources with SRLG constraints has not been studied in multicast optical networks. In this letter, considering SRLG sharing, we propose a novel algorithm –multicast with SRLG sharing (MSS)– to establish a protection light tree. Finally, the algorithm MSS and the algorithm multicast with no SRLG sharing (MNSS) are compared through a simulation to show that our new sharing scheme of SRLG sharing is more efficient than that of no SRLG sharing in terms of spare resource utilization and blocking probability.
Mobility Influences on the Capacity of Wireless Cellular Networks
Yide Zhang,Lemin Li,Bo Li 한국전자통신연구원 2006 ETRI Journal Vol.28 No.6
Capacity has always been a major concern in wireless networks. This letter studies the impact of mobility on the overall system capacity in wireless cellular networks. In this letter, we present a simple system model which we developed to capture the inherent relationships among system capacity, new call blocking probability, handoff dropping probability, call terminating probability, and bandwidth utilization rate. We investigate the complex relationship between mobility and capacity-related parameters. Through simulation, we demonstrate that mobility has a significant impact on capacity and is reversely proportional to the bandwidth reserved for handoff traffic.
Opportunistic Scheduling with QoS Constraints for Multiclass Services HSUPA System
Dan Liao,Lemin Li 한국전자통신연구원 2007 ETRI Journal Vol.29 No.2
This paper focuses on the scheduling problem with the objective of maximizing system throughput, while guaranteeing long-term quality of service (QoS) constraints for non-realtime data users and short-term QoS constraints for realtime multimedia users in multiclass service highspeed uplink packet access (HSUPA) systems. After studying the feasible rate region for multiclass service HSUPA systems, we formulate this scheduling problem and propose a multi-constraints HSUPA opportunistic scheduling (MHOS) algorithm to solve this problem. The MHOS algorithm selects the optimal subset of users for transmission at each time slot to maximize system throughput, while guaranteeing the different constraints. The selection is made according to channel condition, feasible rate region, and user weights, which are adjusted by stochastic approximation algorithms to guarantee the different QoS constraints at different time scales. Simulation results show that the proposed MHOS algorithm guarantees QoS constraints, and achieves high system throughput.
Improved Selective Randomized Load Balancing in Mesh Networks
Xiaoning Zhang,Lemin Li,Sheng Wang,Fei Yang 한국전자통신연구원 2007 ETRI Journal Vol.29 No.2
We propose an improved selective randomized load balancing (ISRLB) robust scheme under the hose uncertainty model for a special double-hop routing network architecture. The ISRLB architecture maintains the resilience properties of Valiant’s load balancing and reduces the network cost/propagation delay in all other robust routing schemes.
Protecting Multicast Sessions in WDM Networks with Sparse-Splitting Constraints
Xiong Wang,Sheng Wang,Lemin Li 한국전자통신연구원 2007 ETRI Journal Vol.29 No.4
In this letter, we study the multicast protection problem in sparse-splitting wavelength-division multiplexing (WDM) optical network, and propose a novel multicast protection algorithm called the shared source-leaf path-based protection (SLPP) algorithm. Unlike the proposals in previous studies, the backup paths derived by SLPP can share wavelength with the primary tree in sparse-splitting WDM networks. Simulations are used to evaluate the effectiveness of the SLPP algorithm.
A Novel Globally Adaptive Load-Balanced Routing Algorithm for Torus Interconnection Networks
Hong Wang,Du Xu,Lemin Li 한국전자통신연구원 2007 ETRI Journal Vol.29 No.3
A globally adaptive load-balanced routing algorithm for torus interconnection networks is proposed. Unlike previously published algorithms, this algorithm employs a new scheme based on collision detection to handle deadlock, and has higher routing adaptability than previous algorithms. Simulation results show that our algorithm outperforms previous algorithms by 16% on benign traffic patterns, and by 10% to 21% on adversarial traffic patterns.
An Improved Shared-Path Protection Algorithm for Double-Link Failures in Meshed WDM Optical Networks
Wang, Xingwei,Guo, Lei,Li, Lemin,Wei, Xuetao The Korea Institute of Information and Commucation 2008 Journal of communications and networks Vol.10 No.3
In this paper, we investigate survivability in wavelength division multiplexing (WDM) mesh networks and propose a new algorithm called improved shared-path protection (ISPP) to completely tolerate the double-link failures. Compared with previous algorithms for protecting double-link failures, i.e., shared-path protection (SPP) and shared-link protection (SLP), the advantage of ISPP is to allow primary paths and backup paths to share the mixed wavelength-links based on the proposed new rules in which some primary wavelength-links can be changed to mixed wavelength-links, which can be shared by primary paths and backup paths. In addition, some mixed wavelength-links also can be shared by different backup paths for saving resources. Simulation results show that ISPP algorithm performs better in resource utilization ratio and blocking probability than conventional SPP and SLP algorithms.
An Improved Shared-Path Protection Algorithm for Double-Link Failures in Meshed WDM Optical Networks
Xingwei Wang,Lei Guo,Lemin Li,Xuetao Wei 한국통신학회 2008 Journal of communications and networks Vol.10 No.3
In this paper, we investigate survivability in wavelength division multiplexing (WDM) mesh networks and propose a new algorithm called improved shared-path protection (ISPP) to completely tolerate the double-link failures. Compared with previous algorithms for protecting double-link failures, i.e., sharedpath protection (SPP) and shared-link protection (SLP), the advantage of ISPP is to allow primary paths and backup paths to share the mixed wavelength-links based on the proposed new rules in which some primary wavelength-links can be changed to mixed wavelength-links,which can be shared by primary paths and backup paths. In addition, some mixed wavelength-links also can be shared by different backup paths for saving resources. Simulation results show that ISPP algorithm performs better in resource utilization ratio and blocking probability than conventional SPP and SLP algorithms.
Enhanced Dynamic Segment Protection in WDM Optical Networks under Reliability Constraints
Lei Guo,Jin Cao,Hongfang Yu,Lemin Li 한국전자통신연구원 2006 ETRI Journal Vol.28 No.1
In this letter, we study the protection problem in wavelength division multiplexing (WDM) optical networks, and propose a novel dynamic heuristic algorithm called differentiated reliable segment protection (DRSP). Differing from previous work, DRSP can effectively avoid the trap problem and is able to find a feasible solution for each connection request. Therefore, DRSP outperforms the previous work. Simulation results have shown to be promising.