An Overview of Radio Resource Management in Relay-Enhanced OFDMA-Based Networks

Salem, Mohamed; Adinoyi, Abdulkareem; Rahman, Mahmudur; Yanıkömeroğlu, Halim; Falconer, D.D.; Kim, Young-Doo; Kim, Eung-Sun; Cheong, Yoonchae

doi:10.1109/surv.2010.032210.00071

Cited by 150 publications

(118 citation statements)

References 43 publications

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“…Coordinated transmission schemes can improve the capacity near the cell edge, however at the expense of more radio resources used (e.g., 2-3 BS transmitting) and a signaling overhead and less scheduling freedom of choice, so the outcome is questionable. Multihop techniques (using decode-and-forward relay nodes, RN) are reasonable to increase cell edge capacity or coverage [2], [3] but with (low) additional cost and gains typically below 50% [4].…”

Section: Introductionmentioning

confidence: 99%

On increasing the spectral efficiency more than 100% by user-in-the-control-loop

Schoenen

2010

2010 16th Asia-Pacific Conference on Communications (APCC)

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Abstract-OFDMA has become the key technology for future cellular wireless networks like the IMT-Advanced systems IEEE 802.16m and 3GPP LTE-A. The advantage of allowing different modulation&coding schemes (PhyModes) adaptively for each radio resource is at the same time a new disadvantage because the performance is now distance-dependent from the base station (BS) and the total spectral efficiency depends on how user terminals (UTs) are provided with service opportunities. Instead of increasing the effort to support cell-edge users with high data rates this paper investigates the chances of letting the user participate in the process such that his mobility becomes utilitydriven, in a similar way the user behaves in 802.11 hotspot areas. The user's willingness to move to regions of higher SINR must be supported by a display of the current situation (and indications where to move) plus a utility model (lower cost or higher data rate) which motivates moving a distance monotonic in the utility value. By giving input to the user and utilizing the output of his behavior the user becomes a member of the control loop, in a system theoretic sense. The paper shows numeric results of common scenarios and compares the old and new paradigms.

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Section: Introductionmentioning

confidence: 99%

On increasing the spectral efficiency more than 100% by user-in-the-control-loop

Schoenen

2010

2010 16th Asia-Pacific Conference on Communications (APCC)

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“…Recent reports clearly state this dilemma of demand exceeding capacity [1]- [3]. Relay nodes [4], [5] or femtocells will only postpone the time shortly at which demand exceeds supply [6]. Clearly on average the customer is not willing to pay more than he does now for his tariff plan.…”

Section: Introductionmentioning

confidence: 99%

Green communications by demand shaping and user-in-the-loop tariff-based control

Schoenen

Bulu

Mirtaheri

et al. 2011

2011 IEEE Online Conference on Green Communications

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Abstract-The new field of green communications can be divided into a) energy-efficient communications equipment or b) using information and communication technology to improve the world to become more energy aware. Mobile data traffic and utility energy consumption have a lot in common. There is a limited supply due to limited resources, and only growth (of quantities, technology) can increase this, at the cost of a higher carbon footprint. The green index is defined here for cellular wireless.On the other hand there is a demand which is user-generated, variable over time and space, and ever increasing at a fast pace. Flat rates or almost flat utility tariffs have spoiled users and established high user expectations. Instead of engineering for the growth of supply, this paper investigates how to engineer for controlling the demand side. Dealing with congestion is a consequence of the supply=demand regime and the end of overprovisioning. New tariffs are required that are tailored to the major QoS classes and help to shape demand at the user and application level. This paper investigates QoS-aware demand shaping and control by user-in-the-loop and tariff-based control.

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“…The requirements by the ITU [2] are ambitious so that various advanced techniques must be considered, e.g., MIMO, CoMP, and fractional frequency reuse. Multihop techniques (using decode-and-forward relay nodes, RN) have also been standardized to either increase cell edge capacity, coverage, or both [3], [4].…”

Section: Introductionmentioning

confidence: 99%

“…The result is indeed a higher spectral efficiency. The dilemma between throughput capacity and fairness is known quite well [4].…”

Section: Introductionmentioning

confidence: 99%

User in the Loop: Mobility Aware Users Substantially Boost Spectral Efficiency of Cellular OFDMA Systems

2011

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Abstract-Wireless cellular networks perform with a system spectral efficiency which depends on the user terminal distribution over the cell area. Due to an adaptive modulation and coding scheme which depends on the signal-to-interference+noise (SINR) ratio, the achievable data rate is typically an order of magnitude higher in the cell center compared to the cell edge. The performance of IMT-Advanced cellular radio systems like IEEE 802.16m and 3GPP LTE-A will strongly depend on algorithms to cope with the low SINR in the service area. The new paradigm introduced in this paper motivates users to opportunistically change location according to operator recommendation displayed on the user terminal to achieve a much better SINR than currently available. Benefits are the increase of network capacity and higher data rates or potentially a financial incentive for the convinced users. Numeric results based on analysis of IMT scenarios are provided suggesting large cell spectral efficiency gains.

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An Overview of Radio Resource Management in Relay-Enhanced OFDMA-Based Networks

Cited by 150 publications

References 43 publications

On increasing the spectral efficiency more than 100% by user-in-the-control-loop

On increasing the spectral efficiency more than 100% by user-in-the-control-loop

Green communications by demand shaping and user-in-the-loop tariff-based control

User in the Loop: Mobility Aware Users Substantially Boost Spectral Efficiency of Cellular OFDMA Systems

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