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Improved dual decomposition based optimization for DSL dynamic spectrum management
- IEEE Trans. Sig. Proc
, 2010
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ENERGY EFFICIENT POWER BACK-OFF MANAGEMENT FOR VDSL2 TRANSMISSION
"... Recently energy saving has become an important issue also for wired communication. In this paper we investigate the potential of using power back-off (PBO) as a means to achieve higher energy efficiency. Based on a global energy optimisation formulation we derive an energy efficient PBO (EEPBO) algo ..."
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Recently energy saving has become an important issue also for wired communication. In this paper we investigate the potential of using power back-off (PBO) as a means to achieve higher energy efficiency. Based on a global energy optimisation formulation we derive an energy efficient PBO (EEPBO) algorithm. Through simulation we compare EEPBO with continuous bit-loading to the near-optimal energy efficient spectrum balancing (EESB) algorithm and an integer bit-loading version of EEPBO with energy efficient iterative spectrum balancing (EEISB). By restricting the search to practical levels of PBO parameters instead of optimizing the bit-loading on each and every carrier separately we see a significant reduction in computational complexity. It also means that EEPBO is already supported by current VDSL2 systems. Still, even after restricting the spectrum to what the PBO in VDSL2 allows we can show, through simulations, that EEPBO achieves the same level of energy efficiency as the near-optimal methods. This high performance and low-complexity together with standard compliance makes EEPBO a very attractive choice for future energy efficient transmission in VDSL2. 1.
Energy-efficient design and optimization of wireline access networks
, 2011
"... Abstract—Access networks, in particular, Digital Subscriber Line (DSL) equipment, are a significant source of energy con-sumption for wireline operators. Replacing large monolithic DSLAMs with smaller remote DSLAM units closer to customers can reduce the energy consumption as well as increase the re ..."
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Abstract—Access networks, in particular, Digital Subscriber Line (DSL) equipment, are a significant source of energy con-sumption for wireline operators. Replacing large monolithic DSLAMs with smaller remote DSLAM units closer to customers can reduce the energy consumption as well as increase the reach of the access network. This paper attempts to formalize the design and optimization of the “last mile ” wireline access network with energy as one of the costs to be minimized. In particular, the placement of remote DSLAM units needs to be optimized. We propose solutions for two scenarios. For the scenario where an existing all-copper network from the central office to the customers is to be transformed into a fiber-copper network with remote DSLAM units, we present efficient polynomial-time solutions. For the green-field scenario, where both the access network layout and the placement of remote DSLAM units must be determined, we show that this problem is NP-complete. We present an optimal ILP formulation and also design an efficient heuristic-based approach to build a power and cost optimized access network. Our heuristic-based approach yields results that are very close to optimal. We show how the power consumption of the access network can be reduced by carefully planning the access network and introducing remote DSLAM units. I.
DSM PERFORMANCE ON PRACTICAL DSL SYSTEMS BASED ON ESTIMATED CROSSTALK CHANNEL INFORMATION
"... This paper investigates practical aspects associated to the adoption of dynamic spectrum management (DSM) in existing digital subscriber lines (DSL) access networks. A standard-compliant crosstalk estimation method is utilized in order to retrieve the crosstalk channel information needed by, e.g., a ..."
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This paper investigates practical aspects associated to the adoption of dynamic spectrum management (DSM) in existing digital subscriber lines (DSL) access networks. A standard-compliant crosstalk estimation method is utilized in order to retrieve the crosstalk channel information needed by, e.g., a DSM level 2 system. A DSM application framework was developed to help testing DSM in practice and investigate the foreseen gap between the DSM results obtained with simulations and practical achievable data rates. This framework is based on “off-the-shelf ” DSL equipments and is responsible for coordinating and monitoring the test procedures via DSL standardized protocols. The work also discusses the discrepancies identified in laboratory experiments, associated to different sources of mismatch between simulations and practice. 1.
Delay-Constrained Scheduling for Interference-Limited Multi-Carrier Systems
"... Abstract—The reduction of energy consumption in digital subscriber line (DSL) networks has obtained considerable attention recently. Today’s DSL is designed under an “always on ” principle to keep the crosstalk noise as stable as possible. Departuring from this restriction, one approach to achieve e ..."
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Abstract—The reduction of energy consumption in digital subscriber line (DSL) networks has obtained considerable attention recently. Today’s DSL is designed under an “always on ” principle to keep the crosstalk noise as stable as possible. Departuring from this restriction, one approach to achieve energy savings is by “lazy scheduling ” which exploits the tradeoff between energy-consumption and transmission delay inherent in many communication systems. This work extends the scope of this idea to multi-user interference limited systems employing multi-carrier modulation. Mathematical decomposition appears to be a natural approach for cross-layer optimization when the physical-layer spectrum management algorithm is already based on dual relaxation. We identify Benders decomposition as the appropriate choice of an optimization scheme for rate and delay constrained energyminimization. Based on this we propose a cross-layer scheduler for multi-user/multi-carrier systems. By simulations of a singlehop, multi-user DSL scenario this scheduler is shown to closely approximate the optimal solution to this nonconvex problem. Furthermore, by example we demonstrate that scheduling for interference avoidance in DSL yields negligible additional performance gains over sole physical layer spectrum balancing in practice. I.
Notice
, 2014
"... The Broadband Forum is a non-profit corporation organized to create guidelines for broadband ..."
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The Broadband Forum is a non-profit corporation organized to create guidelines for broadband
Spectrum Optimization in Multi-User Multi-Carrier Systems with Iterative Convex and Nonconvex Approximation Methods
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