Efficient allocation of CQI channels in broadband wireless networks

Cohen, Reuven; Grebla, Guy

doi:10.1109/infcom.2011.5935325

Cited by 4 publications

(2 citation statements)

References 19 publications

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“…As in standard wireless networks, we assume that the BS receives periodic CSIs (Channel State Indicators) [10] from the users. Using these reports, the BS is able to predict the SINR for the transmission to the user in each scheduling area.…”

Section: Frequency Reuse Modelmentioning

confidence: 99%

Joint Scheduling and Fast Cell Selection in OFDMA Wireless Networks

Cohen

Grebla

2015

IEEE/ACM Trans. Networking

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Abstract-In modern broadband cellular networks, the omni-directional antenna at each cell is replaced by 3 or 6 directional antennas, one in every sector. While every sector can run its own scheduling algorithm, bandwidth utilization can be significantly increased if a joint scheduler makes these decisions for all the sectors. This gives rise to a new problem, referred to as "joint scheduling," addressed in this paper for the first time. The problem is proven to be NP-hard, but we propose efficient algorithms with a worstcase performance guarantee for solving it. We then show that the proposed algorithms indeed substantially increase the network throughput.

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Section: Frequency Reuse Modelmentioning

confidence: 99%

Joint Scheduling and Fast Cell Selection in OFDMA Wireless Networks

Cohen

Grebla

2015

IEEE/ACM Trans. Networking

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“…In the considered model, the BS receives periodic channel quality indications (CQIs) [12] from the UEs and RNs. Using these reports, the BS is able to estimate the SINR for transmissions from the BS to each UE or RN.…”

Section: B Our Scheduling Modelmentioning

confidence: 99%

Multidimensional OFDMA Scheduling in a Wireless Network With Relay Nodes

Cohen

Grebla

2015

IEEE/ACM Trans. Networking

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LTE Advanced and other 4G cellular standards allow relay nodes (RNs) to be deployed as a substitute for base stations (BSs). Unlike a BS, an RN is not directly connected to the backbone. Rather, each RN is associated with a donor BS, to which it is connected through the OFDMA wireless link. A very important task in the operation of a wireless network is packet scheduling. In a network with RNs, such scheduling decisions must be made in each cell not only for the BS, but also for the RNs. Because the scheduler in a network with RNs must take into account the transmission resources of the BS and the RNs, it needs to find a feasible schedule that does not exceed the resources of a multidimensional resource pool. This makes the scheduling problem computationally harder than in a network without RNs. In this paper, we define and study the packet-level scheduling problem for a network with RNs. This problem is not only NP-hard, but also admits no efficient polynomial-time approximation scheme. To solve it, we propose an efficient algorithm with a performance guarantee and a simple water-filling heuristic. To the best of our knowledge, our algorithm is the first packet-level scheduling algorithm that provides a performance guarantee for a network with RNs. Using simulations, we evaluate our new algorithms and show that they perform very well.

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A Strategy to Reduce the Signaling Requirements of CQI Feedback Schemes

Sivridis

2012

Wireless Pers Commun

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Efficient allocation of CQI channels in broadband wireless networks

Cited by 4 publications

References 19 publications

Joint Scheduling and Fast Cell Selection in OFDMA Wireless Networks

Joint Scheduling and Fast Cell Selection in OFDMA Wireless Networks

Multidimensional OFDMA Scheduling in a Wireless Network With Relay Nodes

A Strategy to Reduce the Signaling Requirements of CQI Feedback Schemes

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