A terminal and method for calculating channel quality indication information

A channel quality indication and channel measurement technology, which is applied in the direction of transmission modification based on link quality, channel estimation, and signaling as a feature, can solve problems such as inability to obtain accurate channel quality indication information, and achieve guaranteed performance and effects. Guaranteed calculation accuracy and improved performance

Active Publication Date: 2011-12-21
ZTE CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0049] The technical problem to be solved by the present invention is to provide a terminal and method for calculating channel quality indication information, which is used to perform channel measurement based on reference signals, and then obtain channel quality indication information. This method considers various factors for the calculation of CQI Influence, considering the impact of various complex conditions on CQI calculation, thus solving the problem that the existing system cannot obtain accurate channel quality indication information when using transmission mode 9, and improving the flexibility and performance of the system

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  • A terminal and method for calculating channel quality indication information
  • A terminal and method for calculating channel quality indication information
  • A terminal and method for calculating channel quality indication information

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Embodiment 1

[0152] The CQI calculation conditions determined in this embodiment include, corresponding to transmission mode 9, regardless of whether the current subframe is a multicast-single frequency network MB-SFN subframe or a non-multicast-single frequency network MB-SFN subframe, when the terminal calculates the CQI The CRS overhead of the current subframe is calculated according to the non-multicast-Single Frequency Network MB-SFN subframe.

[0153] At this point, there are two possibilities:

[0154] The first possibility is that the current subframe is a multicast-single frequency network MB-SFN subframe. At this time, when calculating the CQI, it needs to assume that the CRS overhead of the current subframe is calculated as a non-MB-SFN common subframe.

[0155] For transmission mode 9, the MBSFN subframe exists reasonably. If the UE finds that the subframe corresponding to the CSI reference resource is an MBSFN subframe, then at this time, the data area of ​​the MBSFN subframe ...

Embodiment 2

[0160] In this embodiment, the determined CQI calculation conditions include, for transmission mode 9:

[0161] (1) When PMI / RI is not configured, if the number of antenna ports of PBCH is 1, the transmission mode is set to single antenna port transmission;

[0162] (2) When PMI / RI is not configured, if the number of antenna ports of PBCH is greater than 1, the transmission mode is set to transmit diversity;

[0163] (3) When PMI / RI is configured, the transmission mode is set to at most eight layers of transmission.

[0164] Wherein, the base station can configure the UE to have PMI / RI feedback or not to have PMI / RI feedback through the high layer parameter pmi-RI-Report.

[0165] Furthermore, when PMI / RI is configured, the transmission of up to eight layers includes up to eight layers of closed-loop spatial multiplexing transmission (when the number of CSI-RS ports is greater than 1) and open-loop single-layer transmission (when the CSI-RS when the number of ports is 1).

...

Embodiment 3

[0171] In this embodiment, the determined CQI calculation conditions include, for transmission mode 9:

[0172] (1) When PMI / RI is not configured, if the number of antenna ports of PBCH is 1, the transmission mode is set to single antenna port transmission;

[0173] (2) When PMI / RI is not configured, if the number of antenna ports of PBCH is greater than 1, the transmission mode is set to transmit diversity;

[0174] (3) When PMI / RI is configured, if the number of CSI-RS ports is 1, set the transmission mode to single-antenna port transmission; if the number of CSI-RS ports is greater than 1, set the transmission mode to at most eight-layer transmission.

[0175] Wherein, the base station can configure the UE to have PMI / RI feedback or not to have PMI / RI feedback through the high layer parameter pmi-RI-Report.

[0176] Specifically, if the UE is configured to have PMI / RI and the number of CSI-RS ports is greater than 1, the transmission mode is set to up to eight layers of cl...

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Abstract

Disclosed in the present invention a method for calculating channel quality indication information and a terminal thereof. The method involves performing channel measurement by terminal according to received cell state information-reference signal (CSI-RS) or cell reference signal (CRS), determining a channel state information (CSI) reference resource, and determining condition of calculating channel quality indication (CQI), then calculating CQI value corresponding to the CSI reference resource by terminal according to the determined condition and the measured result. The invention makes a reasonable set of the condition of calculating CQI, and ensures performance and effectiveness of the system link self-adaptation.

Description

technical field [0001] The invention relates to the field of mobile wireless communication, in particular to a terminal and method for calculating channel quality indication information for a specific transmission mode in a wireless communication system. Background technique [0002] In wireless communication technology, when the base station side (e.g., evolved Node B, eNB) uses multiple antennas to transmit data, it can adopt spatial multiplexing to improve the data transmission rate, that is, the same time-frequency resources are used at the transmitting end to Different antenna positions transmit different data, and the receiving end (for example, user equipment UE) also uses multiple antennas to receive data. In the case of a single user, all antenna resources are allocated to the same user, and this user exclusively occupies the physical resources allocated to the base station side within a transmission interval. This transmission method is called Single User Multiple ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L1/06H04L25/02H04B7/06
CPCH04L25/0202H04L1/0026H04B17/0042H04B17/309H04B7/0452H04B7/0456H04B7/046H04B7/0486H04B7/063H04B7/0632H04B7/0639H04B7/0689
Inventor 陈艺戬徐俊李儒岳戴博张峻峰
Owner ZTE CORP
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