NeTS-WN: Bit-Switched Wireless Networks

NeTS-WN：位交换无线网络

• 批准号: 0721702
• 负责人: Hari Balakrishnan
• 金额: $ 60万
• 依托单位: Massachusetts Institute of Technology
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2007
• 资助国家: 美国
• 起止时间: 2007-09-01 至 2012-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0721702&HistoricalAwards=false
• 关键词: NeTS; WN; Bit; Switched; Wireless

Wireless mesh networks are becoming an important mode of high-speed Internet access, especially in parts of the country and the world that are poorly served by wireline providers. In addition, an increasing number of sensor networks rely on mesh protocols. This proposal seeks to dramatically improve the total network capacity and individual data transfer throughput in these networks using the following mutually-reinforcing ideas:1. Partial Packet Recovery (PPR) - a method used to determine which bits are likely to be correct in any given packet reception using physical layer hints, derived from modified wireless physical layers. PPR will lead to more robust reception and fewer retransmissions, and thus the opportunity to use both more aggressively concurrent channel access algorithms and higher bit-rates.2. Channel access using conflict maps, a protocol to aggressively exploit concurrent transmissions whenever they are likely to succeed, using measured observations of past success and failure. This technique will lead to more accurate, less conservative transmission decisions than existing techniques, thereby increasing spatial reuse.3. Bit-wise opportunistic routing (Bit-ExOR), which takes advantage of the fact that a transmission often results in different receivers correctly receiving different subsets of the bits in the transmission. Each node uses PPR and forwards the correct portions of a packet, while collaborating with other nodes to avoid duplicate forwarding.This project could have a long-term impact on the right protocol architecture for wireless networks - one in which error recovery and forwarding occur at the "bit-level'' (at bit-range granularities), rather than at the packet-level, and where channel access uses observations of the fate of the individual bits in previous transmissions to maximize concurrency. The resulting abstraction is a "bit-switched network", a modest but potentially powerful twist on packet switching.

无线Mesh网络正在成为高速互联网接入的一种重要模式，特别是在有线运营商服务不佳的国家和世界部分地区。此外，越来越多的传感器网络依赖于Mesh协议。该建议寻求使用以下相辅相成的想法来显著提高这些网络中的总网络容量和单个数据传输吞吐量：1.部分分组恢复(PPR)-使用从修改后的无线物理层导出的物理层提示来确定在任何给定分组接收中哪些比特可能是正确的方法。PPR将导致更稳健的接收和更少的重传，从而有机会使用更积极的并发信道接入算法和更高的比特率。使用冲突映射的通道访问，这是一种协议，当并发传输可能成功时，该协议使用对过去成功和失败的测量结果来积极利用并发传输。这项技术将导致比现有技术更准确、更不保守的传输决策，从而增加空间重复使用。按位机会路由(BIT-EXOR)，它利用这样一个事实，即传输通常会导致不同的接收器正确地接收传输中的不同的比特子集。每个节点使用PPR并转发分组的正确部分，同时与其他节点协作以避免重复转发。该项目可能会对无线网络的正确协议体系结构产生长期影响--其中错误恢复和转发发生在“比特级”(比特范围粒度)，而不是分组级，并且信道接入使用对先前传输中单个比特的命运的观察来最大化并发性。由此产生的抽象是一个“比特交换网络”，这是对分组交换的适度但潜在的强大扭曲。