Incentive Based Power Control in Wireless Networks of 无线网络中基于功率控制的激励.ppt

Utility-based power control for interference mitigation in a mixed femtocell-macrocell environment Outline Why do we focus on interference (mitigation)? (utility-based) power control? femtocell networks? Interference mitigation through power control in a mixed femtocell-macrocell environment A model with different objective functions for femtocells and macrocells What if there are still unsatisfied nodes? Conclusions Motivation (1) Motivation (2) Why Femtocells? (1) Femtocell access points (FAPs) low-power access points provide voice and broadband services allow a small number of simultaneous calls and data sessions connect to the service provider’s network via broadband Why Femtocells? (2) (+) dense deployment? increase spectrum reuse (+) better indoor coverage? superior indoor reception (+) low(er) cost (than macrocell deployment) (+) plug and play installation … (-) interference: This is the challenge! Fundamentals of Power Control Power control is a standard radio resource management method for interference mitigation Analogy: A person that increases/ reduces his level of voice Power Control Taxonomy (1) [Douros Polyzos, Elsevier COMCOM, 2011] Power Control Taxonomy (2) Power Control Taxonomy (3) Why don’t we combine these approaches? Power Control in a mixed femtocell-macrocell environment (1) N transmitters share the same portion of the spectrum N1 macrocell transmitters high(er) priority to be served by the operators low(er) QoS demands (than femtocells) N2 femtocell transmitters are deployed by indoor users for their self interest should not create high interference to macrocell users high(er) QoS demands Conclusion: Difficult to describe their needs and restrictions with the same model We can use different objective functions! Macrocell Transmitter Objective Function: subject to and Femtocell Transmitter Objective Function: subject to