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Methods and systems for csi-rs port selection for csi-reporting

A technology of ports and antenna ports, which is applied in the field of selection of CSI-RS port subsets, and can solve problems such as invisible wireless devices

Active Publication Date: 2018-07-31
TELEFON AB LM ERICSSON (PUBL)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The mapping of these ports to the N antenna elements is an eNB implementation issue and is therefore invisible to the wireless device

Method used

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  • Methods and systems for csi-rs port selection for csi-reporting
  • Methods and systems for csi-rs port selection for csi-reporting

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Embodiment Construction

[0092] In 3GPP Release 13, additional antenna ports are specified for CSI feedback, and up to 16 ports can be supported. In future versions, even more ports (eg 32) may be supported. However, legacy (Release 12 or earlier) wireless devices support up to 8 port CSI measurements. Therefore, there is a need to support legacy terminals of network nodes with more than 8 CSI-RS ports in an efficient manner without increasing CSI-RS overhead. More specifically, one issue is how to select a subset of Release 13 CSI-RS ports for legacy wireless devices and still match legacy codebook designs for cross-polarized antenna arrays. Even for Release 13 wireless devices, it would be beneficial if fewer CSI-RS ports are used for periodic reporting and a full set of CSI-RS antenna ports are used for aperiodic reporting. There is a problem with how to select a subset of the configured full set of CSI-RS ports for CSI measurement and reporting.

[0093] The present disclosure contemplates vari...

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PUM

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Abstract

According to certain embodiments, a method in a network node is disclosed. The method comprises selecting a subset from a predetermined set of P CSI-RS ports for receiving channel information. The network node comprises an antenna array with controllable polarization. Each CSI-RS port corresponds to a combination of a set of resource elements and an antenna port of said antenna array. The predetermined set comprises a first number P1 of CSI-RS ports with a first polarization state and a second number P2 of CSI-RS ports with a second polarization state. The first and second polarization statesare distinct. The method further comprises populating the subset with Q CSI-RS ports in such manner that the ratio of CSI-RS ports respectively having the first and second polarization states is equalto the ratio of the first and second numbers.

Description

[0001] priority [0002] This application claims U.S. Serial No. 62 / 251574, filed November 5, 2015, entitled "Method of CSI-RS Port Selection for CSI reporting on PUCCH" Priority of Provisional Patent Application, the disclosure of which is hereby incorporated by reference. technical field [0003] The present disclosure relates generally to wireless communications, and more specifically, to CSI-RS port-to-resource mapping and selection of a subset of CSI-RS ports for CSI reporting. Background technique [0004] figure 1 Basic Long Term Evolution (LTE) downlink physical resources are shown. LTE uses Orthogonal Frequency Division Multiplexing (OFDM) in the downlink and uses Discrete Fourier Transform (DFT) to spread OFDM in the uplink. The basic LTE downlink physical resources can thus be viewed as a time-frequency grid, where each resource element (or time / frequency resource element TFRE) corresponds to one OFDM subcarrier during one OFDM symbol interval. [0005] figu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04B7/06H04B7/0417H04L5/00G06Q10/08G16H10/60
CPCH04B7/04G06Q10/10G06Q40/08G16H10/60G16H20/10G06Q10/08G06Q30/0633G06Q50/22H04B7/0417H04B7/0626H04L5/0048
Inventor S·高M·弗伦内R·M·哈里森S·穆鲁加内森
Owner TELEFON AB LM ERICSSON (PUBL)