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Qingwen Liu
University of Minnesota
17Publications
11H-index
1,969Citations
Publications 17
Newest
Xing Wang1
Estimated H-index: 1
(University of Minnesota),
Qingwen Liu11
Estimated H-index: 11
(University of Minnesota),
Georgios B. Giannakis113
Estimated H-index: 113
(University of Minnesota)
A cross-layer design is developed for quality-of-service (QoS)-guaranteed traffic. The novel design jointly exploits the error-correcting capability of the truncated automatic repeat request (ARQ) protocol at the data link layer and the adaptation ability of the adaptive modulation and coding (AMC) scheme at the physical layer to optimize system performance for QoS-guaranteed traffic. The queuing behavior induced by both the truncated ARQ protocol and the AMC scheme is analyzed with an embedded ...
Ref 17Cited 112
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Qingwen Liu11
Estimated H-index: 11
(University of Minnesota),
Shengli Zhou53
Estimated H-index: 53
(University of Connecticut),
Georgios B. Giannakis113
Estimated H-index: 113
(University of Minnesota)
Future wired-wireless multimedia networks require diverse quality-of-service (QoS) support. To this end, it is essential to rely on QoS metrics pertinent to wireless links. In this paper, we develop a cross-layer model for adaptive wireless links, which enables derivation of the desired QoS metrics analytically from the typical wireless parameters across the hardware-radio layer, the physical layer and the data link layer. We illustrate the advantages of our model: generality, simplicity, scalab...
Ref 23Cited 26
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Xin Wang17
Estimated H-index: 17
(University of Minnesota),
Qingwen Liu11
Estimated H-index: 11
(University of Minnesota),
Georgios B. Giannakis113
Estimated H-index: 113
(University of Minnesota)
A cross-layer design is developed for quality-of-service (QoS) guaranteed traffic. The proposed design jointly exploits the error-correcting capability of the truncated automatic repeat request (ARQ) protocol at the data link layer and the adaptation ability of the adaptive modulation and coding (AMC) scheme at the physical layer to optimize the system performance. The queuing behavior induced by both the truncated ARQ protocol and the AMC scheme is analyzed with an embedded Markov chain. Analyt...
Ref 17Cited 24
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Cite this paper
Qingwen Liu11
Estimated H-index: 11
(University of Minnesota),
Xin Wang17
Estimated H-index: 17
(University of Minnesota),
Georgios B. Giannakis113
Estimated H-index: 113
(University of Minnesota)
Scheduling plays an important role in providing quality of service (QoS) support to multimedia communications in various kinds of wireless networks, including cellular networks, mobile ad hoc networks, and wireless sensor networks. The authors propose a scheduling algorithm at the medium access control (MAC) layer for multiple connections with diverse QoS requirements, where each connection employs adaptive modulation and coding (AMC) scheme at the physical (PHY) layer over wireless fading chann...
Ref 20Cited 305
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Cite this paper
Qingwen Liu11
Estimated H-index: 11
,
Xin Wang17
Estimated H-index: 17
,
Georgios B. Giannakis113
Estimated H-index: 113
Scheduling plays an important role in providing quality of service (QoS) support to multimedia communications in various kinds of wireless networks, including cellular networks, mobile ad hoc networks, and wireless sensor networks. The authors propose a scheduling algorithm at the medium access control (MAC) layer for multiple connections with diverse QoS requirements, where each connection employs adaptive modulation and coding (AMC) scheme at the physical (PHY) layer over wireless fading chann...
Georgios B. Giannakis113
Estimated H-index: 113
(University of Minnesota),
Qingwen Liu11
Estimated H-index: 11
(University of Minnesota)
The explosive increase in wireless multimedia services motivates the rapid development of next-generation wireless networks. However, multimedia applications impose stringent and diverse quality of service (QoS) requirements, which cannot be satisfactorily addressed through the traditional layered network-protocol architecture, For this reason, cross-layer designs offer essential approaches for research and development of future wireless networks. This thesis offers several novel approaches on c...
Qingwen Liu11
Estimated H-index: 11
(University of Minnesota),
Shengli Zhou53
Estimated H-index: 53
,
Georgios B. Giannakis113
Estimated H-index: 113
Assuming there are always sufficient data waiting to be transmitted, adaptive modulation and coding (AMC) schemes at the physical layer have been traditionally designed separately from higher layers. However, this assumption is not always valid when queuing effects are taken into account at the data link layer. In this paper, we analyze the joint effects of finite-length queuing and AMC for transmissions over wireless links. We present a general analytical procedure, and derive the packet loss r...
Ref 28Cited 458
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Cite this paper
Qingwen Liu11
Estimated H-index: 11
(University of Minnesota),
Xin Wang17
Estimated H-index: 17
(University of Minnesota),
Georgios B. Giannakis113
Estimated H-index: 113
(University of Minnesota)
Scheduling plays an important role in providing quality of service (QoS) support for multimedia networks. We propose a cross-layer scheduler at the medium access control (MAC) layer for multiple connections with diverse QoS requirements, where each connection employs adaptive modulation and coding (AMC) scheme at the physical (PHY) layer. Each connection is assigned a priority, which is updated dynamically based on its channel and service quality; and the connection with the highest priority is ...
Ref 21Cited 37
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Cite this paper
Qingwen Liu11
Estimated H-index: 11
(University of Minnesota),
Shengli Zhou53
Estimated H-index: 53
(University of Connecticut),
Georgios B. Giannakis113
Estimated H-index: 113
Providing guaranteed quality-of-service (QoS) for multimedia applications over wireless fading channels is challenging. To this end, we develop a cross-layer design for multiuser scheduling at the data link layer, with each user employing adaptive modulation and coding (AMC) at the physical layer. By classifying users into: QoS-guaranteed and best-effort users, the proposed scheduler enables prescribed QoS guarantees and efficient bandwidth utilization simultaneously. Furthermore, our cross-laye...
Ref 28Cited 139
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Cite this paper
Qingwen Liu11
Estimated H-index: 11
(University of Minnesota),
Shengli Zhou53
Estimated H-index: 53
(University of Connecticut),
Georgios B. Giannakis113
Estimated H-index: 113
(University of Minnesota)
Wired-wireless multimedia networks require diverse quality-of-service (QoS) support. To this end, it is essential to rely on QoS metrics pertinent to wireless links. In this paper, we develop a cross-layer model for adaptive wireless links, which enables derivation of the desired QoS metrics analytically from the typical wireless parameters across the hardware-radio layer, the physical layer and the data link layer. We illustrate the advantages of our model: generality, simplicity, scalability a...
Ref 20Cited 30
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