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On Achieving Local View Capacity Via Maximal Independent Graph Scheduling

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3 Author(s)
Vaneet Aggarwal ; AT&T Shannon Labs, Florham Park, NJ, USA ; A. Salman Avestimehr ; Ashutosh Sabharwal

“If we know more, we can achieve more.” This adage also applies to communication networks, where more information about the network state translates into higher sum-rates. In this paper, we formalize this increase of sum-rate with increased knowledge of the network state. The knowledge of network state is measured in terms of the number of hops, h, of information available to each transmitter and is labeled as h-local view. To understand how much capacity is lost due to limited information, we propose to use the metric of normalized sum-capacity, which is the h -local view sum-capacity divided by global-view sum capacity. For the cases of one and two-local view, we characterize the normalized sum-capacity for many classes of deterministic and Gaussian interference networks. In many cases, a scheduling scheme called maximal independent graph scheduling is shown to achieve normalized sum-capacity. We also show that its generalization for 1-local view, labeled coded set scheduling, achieves normalized sum-capacity in some cases where its uncoded counterpart fails to do so.

Published in:

IEEE Transactions on Information Theory  (Volume:57 ,  Issue: 5 )