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Channel state information (CSI) reporting method and device thereof

A technology for channel state information and control information, applied in wireless communication, electrical components, etc., can solve the problems of low base station scheduling efficiency and little reference value

Active Publication Date: 2017-02-22
ZTE CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In the prior art, the channel state information (Channel State Information, CSI) reference resource is only one subframe in the time domain, and for the MTC UE under coverage enhancement, its received signal-to-noise ratio ( Signal to Interference plus Noise Ratio, SINR) is particularly low. According to the existing technical solutions, there is too little useful reference information for the scheduling of the base station in the Channel Quality Indicator (CQI) in the CSI reported by the UE, such as the reported The CQI index value (index) in CSI is #0 (there is no corresponding modulation scheme and approximate code rate in CQI index #0), therefore, according to the existing technical solution, the CSI reported by the UE has no effect on the scheduling of the base station (eNB) What reference value causes the scheduling efficiency of the base station to be very low

Method used

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  • Channel state information (CSI) reporting method and device thereof
  • Channel state information (CSI) reporting method and device thereof

Examples

Experimental program
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Embodiment 1

[0188] In this embodiment, a method for determining a CSI reference resource is given.

[0189] In this embodiment, the system bandwidth is divided into several subbands, and the downlink signal can perform frequency hopping and repeated transmission on multiple subbands according to a preset or notified frequency hopping pattern. For example, the PDSCH is sent according to a preset frequency hopping pattern in 10 consecutive subframes. Frequency hopping can be enabled through a system information block (System Information Block, SIB), such as notifying frequency hopping in the SIB, or can be enabled in a UE-specific manner, such as notifying the UE to perform frequency hopping through DCI. Multiple repetition levels can be defined in the system, for example, 4, each UE has its own repetition level, and the method for determining the UE repetition level is not limited in this embodiment. For example, if the repetition level of a certain UE is 1, the repetition level of each c...

Embodiment 2

[0214] In this embodiment, a method for determining a CSI reference resource is given.

[0215] CSI Time Domain Reference Resources:

[0216] The specified number of repetitions corresponding to the CSI may be preset or notified by the base station.

[0217] The CSI time domain reference resource is N determined according to the preset rules rep downlink physical subframes, for example, the CSI time domain reference resources are subframes [n-k-N rep +1,n-k], where n is the reporting subframe, and k is a preset value, for example, k=4 for the FDD system. Subframe [n-k-N rep +1,n-k] means starting from n-k and before N rep physical subframe. For a time division duplexing system (Time Division Duplexing, TDD), different uplink and downlink subframe configurations and different subframes may have different corresponding k values.

[0218] Alternatively, the CSI time-domain reference resources start from n-k and before N rep available downlink subframes, and for the definit...

Embodiment 3

[0222] The aperiodic CSI reporting may be triggered by DCI or RAR, and the DCI or RAR includes CSI reporting request information for triggering the UE to report CSI. Several ways of determining CSI reference resources are given below.

[0223] method one:

[0224] The CSI reference resources may be all subframes in which the UE receives DCI or RAR in the time domain, and may be subbands in which the UE receives downlink signals in all subframes in the frequency domain.

[0225] Alternatively, the CSI reference resource may be all subframes from the start subframe of receiving the DCI or RAR to a preset subframe in the time domain. For example, in an FDD system, the CSI report triggered by the RAR usually occurs in The sixth subframe after the RAR transmission is received sends the PUSCH carrying CSI, then the preset subframe can be defined as n-4, where n is the reporting subframe, then the CSI reference resource is the starting subframe for receiving RAR in the time domain ...

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Abstract

The invention discloses a channel state information (CSI) reporting method and a device thereof. The CSI reporting method comprises the steps of determining a CSI reference resource according to one piece of information selected from the information of a preset number of repetition times, a frequency hopping pattern, downlink control information (DCI) and a random access response (RAR), wherein the CSI reference resource comprises a CSI frequency domain reference resource and a CSI time domain reference resource; and reporting the CSI which corresponds with the preset number of repetition times by the UE. Through the channel state information reporting method and the device thereof, more useful reference information can be supplied for base station scheduling in reporting the CSI by the UE, thereby improving scheduling efficiency of the base station.

Description

technical field [0001] The invention relates to wireless communication technology, in particular to a method and device for reporting channel state information (CSI). Background technique [0002] Machine Type Communication (MTC) User Equipment (User Equipment, UE), also known as Machine to Machine (M2M) user communication equipment, is currently the main application form of the Internet of Things. [0003] In recent years, due to the high spectrum efficiency of Long-Term Evolution (LTE) / Long-Term Evolution Advance (LTE-Advance or LTE-A) LTE-A is the evolution direction of the broadband wireless communication system. MTC multi-type data services based on LTE / LTE-A will also be more attractive. [0004] The MTC UE is generally a low-cost device, and has features such as a relatively small supported radio frequency (Radio Frequency, RF) bandwidth and a single receiving antenna, and its sending and receiving bandwidth is generally 1.4 MHz. There is a type of MTC UE, such as ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04W72/12
CPCH04W72/54
Inventor 张雯夏树强戴博石靖刘锟陈宪明方惠英
Owner ZTE CORP
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