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Techniques to Reduce IEEE 802.11b MAC Layer Handover Time
- ISSN 1651-7717, ISRN KTH/IMIT/LCN/R-03/02–SE, KTH
, 2003
"... Abstract — In this paper we analyze link-layer handover times in wireless local area networks based on the IEEE 802.11b MAC protocol. Our measurements indicate that detection and search phases are the main contributors to the handover time. We show that detection time can be reduced by reacting quic ..."
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Cited by 54 (0 self)
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Abstract — In this paper we analyze link-layer handover times in wireless local area networks based on the IEEE 802.11b MAC protocol. Our measurements indicate that detection and search phases are the main contributors to the handover time. We show that detection time can be reduced by reacting quickly to packet losses and by using shorter beacon intervals. We also show that search time can be reduced by using active scanning. In this case, we calculate values for the two timers that control the duration of active scanning in order to reduce search time. Several simulations illustrate the achieved reduction in handover time. I.
Techniques to reduce IEEE 802.11b handoff time
- in Proc. International Conference on Computer Communications (ICC
, 2004
"... Abstract—We propose and evaluate via simulations techniques to minimize the IEEE 802.11b handoff time. We describe the handoff procedure and divide it into three phases. Our main contribution is a set of techniques to reduce the two longer phases, detection and search I. ..."
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Cited by 42 (1 self)
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Abstract—We propose and evaluate via simulations techniques to minimize the IEEE 802.11b handoff time. We describe the handoff procedure and divide it into three phases. Our main contribution is a set of techniques to reduce the two longer phases, detection and search I.
Inventory management using passive RFID tags: A survey. Weblink.http://www.cs.rutgers.edu/˜badri/553dir/papers/MCPaperFinalcoldetect.pdf
, 2002
"... Radio Frequency Identification (RFID) systems have emerged as an affordable solution for object identification. They are a cheap and error proof alternative to traditional object identification techniques such as bar codes and visual recognition. The problem is to identify objects attached with pass ..."
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Cited by 9 (0 self)
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Radio Frequency Identification (RFID) systems have emerged as an affordable solution for object identification. They are a cheap and error proof alternative to traditional object identification techniques such as bar codes and visual recognition. The problem is to identify objects attached with passive tags. If there are multiple objects within the range of the tag reader, then all objects send their identification to the tag reader at the same time in response to the tag reader’s query. This causes collisions at the tag reader and no tag is identified, leading to retransmission of tag IDs which results in wastage of bandwidth and an increase in the total delay in identifying all the objects. Hence protocols need to be devised between the tags and the tag reader to avoid or minimize collisions. Typical collision resolution protocols for a generic multi-access communication system cannot be directly applied to our problem due to constraints on the design of the tag such as lack of battery, low memory, minimum computation power, etc. The main focus of this paper is to discuss collision resolution protocols between the tag and the tag reader. We have surveyed four protocols for the above problem and discussed their merits and demerits. We also explain the applicability of each of the protocols to a scenario where objects need to be identified and updated in an inventory management system. 1.
Influence of Roaming on Real-Time Traffic in Wireless Networks
- WIP Session of the 3 rd IEEE International Workshop on Factory Communication Systems
, 2000
"... Abstract- This paper briefly presents an ongoing work on the roaming techniques used in wireless LANs and their impact on real-time services. Both 802.11 and Bluetooth are considered but only 802.11 offers a standardized support of mobility, which can be implemented in different ways. In the future, ..."
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Abstract- This paper briefly presents an ongoing work on the roaming techniques used in wireless LANs and their impact on real-time services. Both 802.11 and Bluetooth are considered but only 802.11 offers a standardized support of mobility, which can be implemented in different ways. In the future, we want to design and implement a software layer above the existing Medium Access Control, which would allow real-time traffic to be guaranteed over standard wireless network adapters. This study will help in identifying and evaluating the implications of roaming and its impact on the quality of real-time services. I.
IEEE 802.11 Inter-WLAN Mobility Control with Broadband Supported Distribution System Integrating WLAN and WAN
"... Abstract. The integration of wireless local area networks (WLANs) and the high speed wide area network (WAN) using ‘always on ’ broadband access that could provide an efficient and cost effective inter-WLAN mobility management requires the current WLAN internetworking protocol enhanced. The Inter Ac ..."
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Abstract. The integration of wireless local area networks (WLANs) and the high speed wide area network (WAN) using ‘always on ’ broadband access that could provide an efficient and cost effective inter-WLAN mobility management requires the current WLAN internetworking protocol enhanced. The Inter Access Point Protocol (IAPP) defines methods for access point coordination over a distribution system to support WLAN interworking without any central intelligence to support mobility. The implementation of mobility management with any external central control in a distribution system, including broadband such as DSL, is not specified in any WLAN, including 802.11. This paper, first, presents an implementation of a distribution system with broadband DSL accessed central network control for IEEE 802.11 inter-WLAN mobility. Then the modification to the IAPP protocol messaging required for the broadband supported mobility management for inter-WLAN is presented. Preliminary simulation results demonstrating the effectiveness of the proposed distribution and its signaling are also provided. 1.
EFFICIENT REAL-TIME VIDEO TRANSMISSION IN WIRELESS MESH NETWORK
"... Abstract: We are experiencing rapid improvement in video transmission and picture quality. The technologies are supporting us with real-time video transmissions such as video conferences and webinars. Soon reliable, simple, low cost real-time video will become essential, providing its extensive supp ..."
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Abstract: We are experiencing rapid improvement in video transmission and picture quality. The technologies are supporting us with real-time video transmissions such as video conferences and webinars. Soon reliable, simple, low cost real-time video will become essential, providing its extensive support to mobiles; PDA’s etc. These enhancements are going to affect the consumer behaviour, business culture. Video transmission includes transmitting packets through Wireless Mesh Network (WMN), which turned out to be a challenging scenario for real-time video services. Due to the existing nature of wireless networks include the presence of unpredictable delays and high packet error rates due to the error-prone nature of the wireless links. In this paper, we will propose a model which provides high capacity data transfer with reduced delay. We have simulated and achieved results with higher through put.
Load Distribution In
, 2003
"... A key issue in Wireless LANs (WLANs) is the management of user congestion at popular zones called “hot-spots”. At these sites, there are several access points (APs) with overlapped coverage and throughput is usually unevenly distributed among them. The reason is that the current IEEE 802.11 standard ..."
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A key issue in Wireless LANs (WLANs) is the management of user congestion at popular zones called “hot-spots”. At these sites, there are several access points (APs) with overlapped coverage and throughput is usually unevenly distributed among them. The reason is that the current IEEE 802.11 standard does not support a mechanism to distribute stations, thus they select APs based exclusively on the received signal quality. In addition, when the number of users per AP increases, the throughput per user decreases. As a result, the total network throughput is reduced producing under utilisation of the network resources. Several approaches have been suggested to solve this problem. Some of them are based on the modification or enhancement of the MAC layer, hence changes to the physical layer are required. This would imply that all deployed stations should be changed. Other approaches are based on adding Quality of Service (QoS) support to the standard. These solutions require that stations and APs cooperate, which makes its deployment difficult in existing WLANs. Recently, some vendors of WLAN devices have incorporated load-balancing capabilities within their products. Nevertheless, they also require cooperation between
