Mitigating inter-cell pilot interference via network-based greedy sequence selection and exchange

A pilot interference and network technology, applied in the field of channel state information and channel estimation, can solve problems such as ULCSI quality deterioration

Active Publication Date: 2018-06-08
HUAWEI TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Here, the UL inter-cell pilot interference deteriorates the quality of the UL CSI needed at the BS to decode / demodulate the symbols transmitted by the desired user

Method used

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  • Mitigating inter-cell pilot interference via network-based greedy sequence selection and exchange
  • Mitigating inter-cell pilot interference via network-based greedy sequence selection and exchange
  • Mitigating inter-cell pilot interference via network-based greedy sequence selection and exchange

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Embodiment Construction

[0076] figure 1 An embodiment of a mobile network of a multi-cell communication system according to the invention is shown.

[0077] The system 100 includes a plurality of cells 101 , 102 , 103 and a plurality of base stations 111 , 112 , 113 . Each base station 111 , 112 , 113 is adapted to serve user equipment (UE) 121 , 122 , 123 in its respective cell 101 , 102 , 103 . Each base station is in particular responsible for communication with user equipment located in its cell according to the downlink (DL) and uplink (UP). The term base station is a general term used to define a serving cell, ie an entity serving user equipment located within a cell. A base station may be, for example, a Base Transceiver Station (BTS) in a GSM network, a Node B in a UMTS network, or an eNodeB in LTE.

[0078] exist figure 1 In an embodiment of the present invention, base station 111 obtains channel state information (CSI) through a pilot sequence transmitted by UE 121 in UL 131 . Similarl...

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Abstract

Allocation of CSI-RS or CSI pilot sequences among cells in a cooperative manner to reduce pilot inter-cell interference. Sequences in each cell occupy the same time slot, multiple subcarrier frequencies, and are orthogonal in time via properly chosen cyclic shifts. Sequences in multiple cells are chosen from a pool of non-orthogonal yet distinguishable sequences through their root indices. Exchanging root indices among cells allows a given cell to reconstruct sequences used in neighboring cells and to estimate interfering channels as the number of channel taps is usually limited, thus mitigating pilot contamination. Furthermore, a greedy selection algorithm to find combinations of sequences that further reduce the channel estimation mean-square-error is proposed.

Description

technical field [0001] The present invention relates generally to the field of wireless communications, and in particular to channel state information (CSI) and channel estimation based on pilot sequences in multi-cell systems. Background technique [0002] To meet the increasing demand for high-rate wireless data transmission, for future wireless cellular systems, transmitters with a large number of antennas and serving many users (massive MIMO systems) are currently being advocated. One possible application of such a scenario is the 3rd Generation Partnership Project (3GPP) Long Term Evolution (LTE) / LTE-Evolved Downlink (DL). One of the main challenges of MIMO and massive MIMO operation is obtaining accurate channel state information (CSI) at the base station (BS) to perform beamforming or precoding operations. In LTE systems, this is performed by sending a predefined signal - pilot or pilot sequence - used for channel estimation. [0003] Future 5G systems will use spec...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04J11/00H04L5/00H04L27/26
CPCH04J11/0056H04L5/0048H04L5/0091H04L27/2613H04L5/0073H04B7/0626H04J13/0062H04L25/021H04L25/0242
Inventor 萨米尔·巴济许文
Owner HUAWEI TECH CO LTD
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