Method and apparatus for scheduling, load balancing, and pilot-assignments in reciprocity-based MIMO cellular deployments

Active Publication Date: 2017-02-02
NTT DOCOMO INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0030]A method and apparatus is disclosed herein for scheduling, load balancing and/or pilot assignment in MIMO cellular deployments (e.g., reciprority-based MIMO cellular deployments). In one embodiment, the method comprises receiving, by the central controller from at least one AP, for at least one user terminal, a size of a

Problems solved by technology

Non-uniform load distribution is considered to be a major challenge in small cell networks.
If the load cannot be balanced efficiently, the performance gains that are expected as a result of the increased density of network access points (due to use of small cells) may be distributed in a very non-uniform manner within the user population.
The challenge with reciprocity based training schemes is that the “compound” uplink and downlink channels at the same time and frequency are not the same.
When the transmitter and receiver roles are interchanged, different impairments occur at each node, thereby rendering the two compound channels non-reciprocal.
Furthermore, with large antenna arrays, the achieved user rates harden, i.e. variance in user rate due to fast (e.g., Rayleigh) fading becomes effectively negligible.
As a result, much larger variability of the load can arise across different small BSs, if users simply associate with the BS from which they receive the strongest signal.
The problem of desig

Method used

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  • Method and apparatus for scheduling, load balancing, and pilot-assignments in reciprocity-based MIMO cellular deployments
  • Method and apparatus for scheduling, load balancing, and pilot-assignments in reciprocity-based MIMO cellular deployments
  • Method and apparatus for scheduling, load balancing, and pilot-assignments in reciprocity-based MIMO cellular deployments

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Embodiment Construction

[0043]Embodiments of the invention include techniques for load balancing and scheduling using a combination of processing and information shared between a central controller and a set of APs.

[0044]Embodiments of the invention include methods and apparatuses that allow scheduling, load balancing, and pilot-assignments in reciprocity-based single-user and multiuser MIIVIO cellular deployments, including such deployment with large antenna arrays and a large number of users. The disclosed scheduling, load balancing and pilot-assignments techniques can be used for providing efficient operation for a variety of wireless networks, including, but not limited to, macro cells, small cells, heterogeneous network deployments.

[0045]Embodiments of the invention consider the joint use of access points (APs) and a central controller (e.g., processor) coupled to these APs for performing load balancing and scheduling over the area served by the APs. Embodiments of the invention leverage an efficient dec

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Abstract

A method and apparatus is disclosed herein for scheduling, load balancing and/or pilot assignment in MIMD cellular deployments (e.g., reciprority-based MIMO cellular deployments). In one embodiment, the method comprises receiving, by the central controller from at least one AP, for at least one user terminal, a size of a user set and user rate information indicative of a rate that can be provided to the user terminal when served in a group of one or more user terminals; and determining, by the central controller, based on user rate information and the user set size, an allocation of AP resources among the user terminals for the at least one

Description

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Claims

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Application Information

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Owner NTT DOCOMO INC
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