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On the Market Power of Network Coding in P2P Content Distribution Systems

机译：P2P内容分发系统中网络编码的市场力量

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Network coding is emerging as a promising alternative to traditional content distribution approaches in P2P networks. By allowing information mixture and randomized block selection, it simplifies the block scheduling problem, resulting in more efficient data delivery. Existing protocols have validated such advantages assuming altruistic and obedient peers. In this paper, we develop an analytical framework that characterizes a coding-based P2P content distribution market where rational agents seek for individual payoff maximization. Unlike existing game theoretical models, we focus on a decentralized resale marketȁ4;through virtual monetary exchanges, agents buy the coded blocks from others and resell their possessions to those in need. We model such transactions as decentralized strategic bargaining games, and derive the equilibrium prices between arbitrary pairs of agents when the market enters the steady state. We further characterize the relations between coding complexity and market properties including agents'' entry price and expected payoff, thus providing guidelines for strategic operations in a real P2P market. Our analysis reveals that the major power of network coding lies in maintaining stability of the market with impatient agents, and incentivizing agents with lower price and higher payoff, at the cost of reasonable coding complexity. Since the traditional P2P content distribution approach is a special case of network coding, our model can be generalized to analyze the equilibrium strategies of rational agents in decentralized resale markets.
机译：网络编码正在成为P2P网络中传统内容分发方法的有希望的替代方法。通过允许信息混合和随机选择块，它简化了块调度问题，从而提高了数据传输效率。假定无私和听话的同龄人，现有协议已验证了这种优势。在本文中，我们开发了一个分析框架，该框架描述了基于编码的P2P内容分发市场，在该市场中，理性的代理商寻求个体收益最大化。与现有的博弈模型不同，我们专注于去中心化的转售市场ȁ4；通过虚拟货币交易，代理商从他人那里购买了已编码的区块并将其财产转售给有需要的人。我们将此类交易建模为分散的战略讨价还价博弈，并在市场进入稳定状态时得出任意一对代理之间的均衡价格。我们进一步刻画了编码复杂性与市场属性（包括代理商的入场价和预期收益）之间的关系，从而为实际P2P市场中的战略运营提供了指导。我们的分析表明，网络编码的主要力量在于保持市场的稳定性和耐心的代理，以及以合理的编码复杂性为代价，以较低的价格和较高的回报来激励代理。由于传统的P2P内容分发方法是网络编码的特例，因此可以推广我们的模型来分析分散转售市场中理性主体的均衡策略。

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