Bandwidth partitioning in decentralized wireless networks

Jindal, Nihar; Andrews, Jeffrey G.; Weber, Steven

doi:10.1109/t-wc.2008.071220

Cited by 68 publications

(79 citation statements)

References 17 publications

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“…For instance, prior work studied the spectrum sharing between two one-way spatial networks in [18], between a spatial network and a cellular uplink network in [19], and one-way spatial networks where the total bandwidth is optimally split into sub-bands to maximize the transmission capacity [20]. Our bandwidth allocation, however, studies the bandwidth sharing between two directions within a single two-way spatial network.…”

Section: Introductionmentioning

confidence: 99%

Two-way transmission capacity of wireless ad-hoc networks

Vaze

Heath

Weber

2010

2010 IEEE International Symposium on Information Theory

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The transmission capacity of an ad-hoc network is the maximum density of active transmitters per unit area, given an outage constraint at each receiver for a fixed rate of transmission. Most prior work on finding the transmission capacity of ad-hoc networks has focused only on one-way communication where a source communicates with a destination and no data is sent from the destination to the source. In practice, however, two-way or bidirectional data transmission is required to support control functions like packet acknowledgements and channel feedback. This paper extends the concept of transmission capacity to two-way wireless ad-hoc networks by incorporating the concept of a two-way outage with different rate requirements in both directions. Tight upper and lower bounds on the two-way transmission capacity are derived for frequency division duplexing. The derived bounds are used to derive the optimal solution for bidirectional bandwidth allocation that maximizes the two-way transmission capacity, which is shown to perform better than allocating bandwidth proportional to the desired rate in both directions. Using the proposed two-way transmission capacity framework, a lower bound on the two-way transmission

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Section: Introductionmentioning

confidence: 99%

Two-way transmission capacity of wireless ad-hoc networks

Vaze

Heath

Weber

2010

2010 IEEE International Symposium on Information Theory

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“…It is possible that interference aggregated from multiple interferers outside the interference region cause an outage at the receiver. By choosing a conservative interference range, however, this possibility is negligible [27].…”

Section: Conclusion and Discussionmentioning

confidence: 99%

On the Connectivity and Multihop Delay of Ad Hoc Cognitive Radio Networks

Ren

Zhao

Swami

2011

IEEE J. Select. Areas Commun.

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We analyze the multihop delay of ad hoc cognitive radio networks, where the transmission delay of each hop consists of the propagation delay and the waiting time for the availability of the communication channel (i.e., the occurrence of a spectrum opportunity at this hop). Using theories and techniques from continuum percolation and ergodicity, we establish the scaling law of the minimum multihop delay with respect to the source-destination distance in cognitive radio networks. When the propagation delay is negligible, we show the starkly different scaling behavior of the minimum multihop delay in instantaneously connected networks as compared to networks that are only intermittently connected due to scarcity of spectrum opportunities. Specifically, if the network is instantaneously connected, the minimum multihop delay is asymptotically independent of the distance; if the network is only intermittently connected, the minimum multihop delay scales linearly with the distance. When the propagation delay is nonnegligible but small, we show that although the scaling order is always linear, the scaling rate for an instantaneously connected network can be orders of magnitude smaller than the one for an intermittently connected network.

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“…It is possible that the interference contributions from multiple interferers outside of this circle cause an outage at the secondary receiver B, but by choosing a conservative interference range R I , this possibility is negligible [18]. To verify the validity of the interference range R I , we take into account the accumulated interference power from all primary transmitters in the simulation, which directly determines the Signal-to-interference ratio (SIR) at the secondary receiver B.…”

Section: Conclusion and Discussionmentioning

confidence: 99%

Power control in cognitive radio networks: how to cross a multi-lane highway

Ren

Zhao

Swami

2009

IEEE J. Select. Areas Commun.

105

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We consider power control in cognitive radio networks where secondary users identify and exploit instantaneous and local spectrum opportunities without causing unacceptable interference to primary users. We qualitatively characterize the impact of the transmission power of secondary users on the occurrence of spectrum opportunities and the reliability of opportunity detection. Based on a Poisson model of the primary network, we quantify these impacts by showing that (i) the probability of spectrum opportunity decreases exponentially with respect to the transmission power of secondary users, where the exponential decay constant is given by the traffic load of primary users; (ii) reliable opportunity detection is achieved in the two extreme regimes in terms of the ratio between the transmission power of secondary users and that of primary users. Such analytical characterizations allow us to study power control for optimal transport throughput under constraints on the interference to primary users. Furthermore, we reveal the difference between detecting primary signals and detecting spectrum opportunities, and demonstrate the complex relationship between physical layer spectrum sensing and MAC layer throughput. The dependency of this PHY-MAC interaction on the application type and the use of handshake signaling such as RTS/CTS is illustrated.

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Bandwidth partitioning in decentralized wireless networks

Cited by 68 publications

References 17 publications

Two-way transmission capacity of wireless ad-hoc networks

Two-way transmission capacity of wireless ad-hoc networks

On the Connectivity and Multihop Delay of Ad Hoc Cognitive Radio Networks

Power control in cognitive radio networks: how to cross a multi-lane highway

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