Location‐assisted clustering and scheduling for coordinated homogeneous and heterogeneous cellular networks

Abstract

The multiple-input multiple-output (MIMO) downlink with transmitter coordination in a cellular network is considered. The transmitters are assumed to be either neighbouring base stations (homogeneous) or a base station with a number of remote radio heads that form picocells in its coverage area (heterogeneous). In centralized coordinated transmission from a cluster of nodes, the channel state information (CSI) of users needs to be sent to a central processor for precoding and resource allocation. Real-time CSI feedback from the users to their home base station and from the base stations to the central processor is a serious challenge from a practical point of view. In this work, efficient location-assisted limited-feedback schemes for homogeneous and heterogeneous cellular networks are proposed. First, a hybrid mode transmission scheme with reduced feedback requirement is proposed for a homogeneous network, in which on the basis of the location of users, some are served using a single-cell multiuser MIMO approach and some using a network MIMO approach. Next, for a heterogeneous network, a location-assisted clustering and scheduling scheme is proposed for the case of joint reference signals, in which multiple transmission nodes that share the reference signals cannot be distinguished from each other. We evaluate the performance of our schemes with a series of simulations. In the homogeneous scenario, we compare with the case of full CSI, and in the heterogeneous scenario, we compare with joint transmission from all nodes in a cell. Copyright

Rotating cluster mechanism for coordinated heterogeneous MIMO cellular networks

“…Aside from the fact that fewer realizations means less computation time for the simulations, using 1600 realizations for both the six-cell and three-cell layouts means a comparison of the results between the two layouts is somewhat more statistically equitable. 11 This is despite the clusters of the patterns in Fig. 2b,d experiencing more surrounding interference, as seen by their larger value of σ I in the simulation setup.…”

“…2b, d, receiving a significant coordinated signal from three BSs is more common. Thus, users in those two cells in the cluster see the most a b improvement from rotation 11 . The trade-off now comes from users in the third cell of the fixed scheme, who with cluster rotation now are forced to experience less advantageous cluster patterns for the sake of overall network fairness.…”

“…Coordinated transmission on the downlink of MU-MIMO HetNets is considered in this work. Since coordination of all BSs in a large cellular network is neither practical nor necessary, coordination of transmissions within limited-size clusters of BSs is considered instead [10,11]. Although the SINR of most users is improved by coordination of clustered BSs, the inter-cell interference is now replaced by inter-cluster interference (ICI).…”

3G network traffic sources measurement and analysis

“…The shape of the probability density function highly depends on the skewness and kurtosis of the flow [47]. Previously, in a preliminary analysis in [33,48,49], we showed that the Pareto distribution could be applied for interarrival time modelling in batch arriving packet system with Polya arrival process. Similar idea for distribution mapping is shown in [50].…”

Simulated annealing user scheduling for coordinated heterogeneous MIMO networks

“…On the downlink of a coordinated multiuser multi cell MIMO HetNet, antennas of multiple BSs of a subset of all BSs (known as a cluster) may act jointly as a single antenna array and each mobile may receive useful signals from several nearby BSs that employ joint precoding and user (or data stream) scheduling [1, 3,4]. This approach requires availability at all involved BSs (transmitting nodes) of data and channel state information for all simultaneously scheduled users, and it 978-1-4673-5051-8/12/$3l.00 ©20 12 IEEE 1157 is known as joint transmission.…”