Joint Base Station Clustering and Beamforming for Non-Orthogonal Multicast and Unicast Transmission with Backhaul Constraints
| Autor: | Ya-Feng Liu, Meixia Tao, Erkai Chen |
|---|---|
| Rok vydání: | 2017 |
| Předmět: |
Beamforming
FOS: Computer and information sciences Multicast Computer science business.industry Computer Science - Information Theory Applied Mathematics Information Theory (cs.IT) ComputerSystemsOrganization_COMPUTER-COMMUNICATIONNETWORKS 020302 automobile design & engineering 020206 networking & telecommunications 02 engineering and technology Data_CODINGANDINFORMATIONTHEORY Multiplexing Computer Science Applications Backhaul (telecommunications) Base station 0203 mechanical engineering 0202 electrical engineering electronic engineering information engineering Cellular network Electrical and Electronic Engineering Unicast business Cluster analysis Computer network |
| DOI: | 10.48550/arxiv.1712.01508 |
| Popis: | The demand for providing multicast services in cellular networks is continuously and fastly increasing. In this work, we propose a non-orthogonal transmission framework based on layered-division multiplexing (LDM) to support multicast and unicast services concurrently in cooperative multi-cell cellular networks with limited backhaul capacity. We adopt a two-layer LDM structure where the first layer is intended for multicast services, the second layer is for unicast services, and the two layers are superposed with different beamformers. Each user decodes the multicast message first, subtracts it, and then decodes its dedicated unicast message. We formulate a joint multicast and unicast beamforming problem with adaptive base station clustering that aims to maximize the weighted sum of the multicast rate and the unicast rate under per-BS power and backhaul constraints. To solve the problem, we first develop a branch-and-bound algorithm to find its global optimum. We then reformulate the problem as a sparse beamforming problem and propose a low-complexity algorithm based on convex-concave procedure. Simulation results demonstrate the significant superiority of the proposed LDM-based non-orthogonal scheme over orthogonal schemes in terms of the achievable multicast-unicast rate region. Comment: to appear in IEEE Trans. on Wireless Communications |
| Databáze: | OpenAIRE |
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