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Method and device for transmitting and receiving channel state information in wireless communication system using multiple antennas

Inactive Publication Date: 2021-07-01
SAMSUNG ELECTRONICS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The patent provides a way to efficiently transmit and receive channel state reports in a wireless communication system with multiple antennas. It also aims to reduce the overhead of channel state reporting and minimize performance loss caused by increased circuit board and PMI overhead.

Problems solved by technology

However, wireless communication systems are typically assigned limited time, frequency, transmit power, or other radio resources for transmitting signals, and thus, assigning relatively many radio resources to the reference signals may relatively reduce the radio resources that may be allocated to data signals.
In particular, periodic channel state reporting is subject to a limitation in the size of the physical uplink control channel (PUCCH) payload, requiring a method for reducing the PMI overhead to fit the PUCCH payload.
However, the periodic channel state reporting that is supported by FD-MIMO bears a large PMI overhead over the existing, and adopting the existing method as it is may cause a significant performance loss.

Method used

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  • Method and device for transmitting and receiving channel state information in wireless communication system using multiple antennas
  • Method and device for transmitting and receiving channel state information in wireless communication system using multiple antennas
  • Method and device for transmitting and receiving channel state information in wireless communication system using multiple antennas

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Experimental program
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first embodiment

[0118]In order to support periodic channel state information reporting based on the 2D codebook, existing subband channel state reporting may expand to wideband and subband reporting.

[0119]FIG. 8 is a view illustrating a method for channel state information reporting in a wireless communication system using multiple antennas according to the first embodiment of the present disclosure, where the feedback timings of the RI 805, i11 / i12 810, and i12 / CQI 815 are shown.

[0120]An analysis of the PMI bits of the 2D codebook reveals that, for the second PMI, i.e., i2(W2), reporting, the existing channel state reporting method is available with 4 bits or less. However, in the case of 810 related to some bits of the first PMI bit payload (W1 bit payload), the PMI bits increase, as follows, for the configuration parameters, N1, N2, O1, O2, and Config, supported for PMI reporting as shown in Tables 14 and 16. Tables 14 and 16 represent examples of PMI overhead of the 2D codebook.

TABLE 14(N1, N2)...

second embodiment

[0145]The second embodiment is directed to a method for supporting periodic channel state reporting using one of CSI-RS resources supported for the NP CSI-RS. As set forth in Tables 5 to 11, the NP CSI-RS may support 12, 16, or more CSI-RS ports using the positions for the existing CSI-RSs in one subframe. The corresponding field is represented as nzp-resourceConfigList-r13 which may be used to set the position for the CSI-RS. Such supporting method is a method for bounding up a plurality of CSI-RS ports to support 12, 16, or more similar CSI-RSs. At this time, such a method is also available as to support the periodic channel state reporting only on a particular CSI-RS resource by designating the CSI-RS resource so as to reduce the overhead of the periodic channel state reporting.

[0146]FIG. 9 is a view illustrating a method for channel state information reporting in a wireless communication system using multiple antennas according to a second embodiment of the present disclosure, s...

third embodiment

[0154]The third embodiment is directed to a method of using the existing 4 or 8 Tx codebooks by combining the CSI-RS ports as set. As mentioned above, the 2Tx codebook may lose freedom or accuracy to support 12 or 16 CSI-RS ports or multiple similar CSI-RS ports. Accordingly, in such case, the performance may encounter a problem. However, supporting 12, 16, or more similar CSI-RS ports using the 2 port CSI-RSs enables the position of the CSI-RS port to be more flexibly set, advantageously allowing for various settings given the mobility and accuracy or the CSI-RS transmit power. Thus, such method, although able to secure enough flexibility and power, is always based on the 2Tx codebook in periodic channel state reporting even in the case of 12 or 16 CSI-RS ports. Therefore, in such case, it is also possible to combine and use the resources. Various methods as follow may be used in such combining.

[0155]Combining method 1: combines and uses with respect to the CSI-RS port index

[0156]C...

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Abstract

The present disclosure relates to a method and a device for efficiently transmitting and receiving a periodic channel state report in a wireless communication system supporting multiple antennas. The method by which a terminal transmits channel state information includes receiving control information comprising information associated with channel state reporting on a subband, receiving at least one reference signal and generating, based on the at least one reference signal, periodic channel state information comprising a first precoding matrix indicator (PMI) for a wideband, and transmitting the periodic channel state information comprising the first PMI for the wideband based on the control information associated with channel state reporting on the subband.

Description

PRIORITY[0001]This application is a National Phase Entry of PCT International Application No. PCT / KR2016 / 013374, which was filed on Nov. 18, 2016 and claims priority to U.S. Provisional Patent Application Nos. 62 / 256,895, 62 / 256,738 and 62 / 257,409, which were filed Nov. 18, 2015, Nov. 18, 2015 and Nov. 19, 2015, respectively, the entire disclosure of each of these application is incorporated herein by reference.BACKGROUND1. Field of the Disclosure[0002]The present disclosure relates to methods and devices for transmitting and receiving channel state information in wireless communication systems, and particularly, to methods and devices for transmitting and receiving channel state information in wireless communication systems using multiple antennas.[0003]2. Description of the Related Art[0004]In order to meet the demand for wireless data traffic soaring since the 4G communication system came to the market, there are ongoing efforts to develop enhanced 5G communication systems or pre...

Claims

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Application Information

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IPC IPC(8): H04B7/06H04L5/00H04W76/27H04B7/0417H04B7/0456
CPCH04B7/0626H04L5/0051H04B7/0639H04B7/0632H04B7/0417H04B7/0486H04W76/27H04B7/0645H04B7/063H04B7/0478Y02D30/70H04B7/0617
Inventor KWAK, YOUNG-WOONOH, HOON-DONG
Owner SAMSUNG ELECTRONICS CO LTD
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