Patrick P. Lam

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A main distinguishing feature of a wireless network compared with a wired network is its broadcast nature, in which the signal transmitted by a node may reach several other nodes, and a node may receive signals from several other nodes simultaneously. Rather than a blessing, this feature is treated more as an interference-inducing nuisance in most wireless(More)
For wireless real-time multimedia applications, the excessive packet loss rate suffered at the receiver, especially when the packets are transported on UDP, is a major issue to resolve. The previously proposed UDP-Lite project was designed to replace traditional UDP, so that erroneous UDP payloads could be passed up to the application layer instead of being(More)
The concept of care-of-address (CoA) is a major cause of excessive handoff delay in Mobile IPv6 for real time multimedia traffic. Many schemes eliminate the use of CoA at the micro-mobility scale, but leave the macro-mobility unsolved. This paper proposes a novel alternative IPv6 mobility scheme based on <i>universal addressing</i> - Cellular Universal IP(More)
There has been an increasing interest in deploying wireless mesh networks (WMNs) for communication and video surveillance purposes thanks to its low cost and ease of deployment. It is well known that a major drawback of WMN is multihop bandwidth degradation, which is primarily caused by contention and radio interference. The use of mesh nodes with multiple(More)
Abstract— In recent years, network mobility (NEMO) has been studied extensively due to its potential applications in military and public transportation. NEMO Basic Support Protocol (NBSP), the current de facto NEMO standard based on mobile IPv6, can be readily deployed using the existing mobile IPv6 infrastructure. However, NBSP’s root in mobile IPv6, such(More)
Wireless Mesh Network (WMN) has become a popular access network architecture in the community due to its low cost and readily deployable nature. However, it is well known that multi-hop transmission in WMN is vulnerable to bandwidth degradation, primarily due to contention and radio interference. A straightforward solution to this problem is to use mesh(More)
In recent years, there has been considerable interest in developing and using wireless mesh networks. Compared to wireless local area networks, wireless mesh networks are more flexible because mesh routers are interconnected by wireless links. In addition, they can be much easier to install and maintain, especially in environments where cables are difficult(More)