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It is known that the achievable data rate per user can be increased when relays are deployed in wireless networks. However, the drawback of this solution is that some of the network resources should be allocated to the relays. In this paper, the authors consider a two-tier network where all users should send/receive data in two hops. Applying vector quantization, they approximate the best relays' locations. The relays' locations are also computed analytically when the number of relays is less than six. Having the relays' locations, the network average transmission rate is evaluated in terms of a set of network parameters. Then, in the space of these network parameters, they introduce the concept of neutrality-surface.
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