Method for designing channel state information reference signal (CSI-RS) in LTE-A (Long Term Evolution-Advanced) system

A channel state information, LTE-A technology, applied in baseband system components, preventing/detecting errors through diversity reception, etc., can solve the problems of multiplexing factor limitation, increase system overhead, increase system overhead, etc. Reuse factor, good compatibility, effect of reducing interference

Inactive Publication Date: 2010-12-22
XIDIAN UNIV
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Problems solved by technology

However, in LTE-A, the system will support antenna configurations up to 8x8. If only CRS multiplexing between antennas is carried out according to the original method, the occupied resource elements (Resource Elements, referred to as REs) will be doubled, greatly increasing System overhead, so 3GPP proposed to divide the newly added CRS into two categories, one is demodulation reference signal (DM-RS) for demodulation, and the other is channel state information for downlink channel estimation Reference signal (CSI-RS), the specific design method of CSI-RS in the world is still under discussion, although some consensus has been achieved, but there are still large differences
In terms of antenna port multiplexing, most domestic companies, such as Huawei, China Mobile, and Datang Telecom, support CDM-F multiplexing. For e

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  • Method for designing channel state information reference signal (CSI-RS) in LTE-A (Long Term Evolution-Advanced) system
  • Method for designing channel state information reference signal (CSI-RS) in LTE-A (Long Term Evolution-Advanced) system
  • Method for designing channel state information reference signal (CSI-RS) in LTE-A (Long Term Evolution-Advanced) system

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Embodiment Construction

[0027] see figure 1 , the specific implementation steps of the present invention are as follows:

[0028]Step 1. Find the resource element RE used to transmit the channel state information reference signal CSI-RS in each physical resource block PRB; the resource element (resource element referred to as RE) occupied by the CSI-RS should avoid the following areas :

[0029] (1) REs occupied by the demodulation reference signal (DM-RS) in R10;

[0030] (2) OFDM symbols occupied by the physical downlink control channel (PDCCH) and the cell-specific reference signal (CRS);

[0031] (3) PRBs occupied by Physical Broadcast Channel (PBCH), Primary Synchronization Channel (PSCH), Secondary Synchronization Channel (SSCH), Paging Channel (PCH), etc.;

[0032] Each PRB includes 12 subcarriers in the frequency domain, which are sequentially marked as 0-11, and includes 14 OFDM symbols in the time domain, which are sequentially recorded as 0-13. From the above analysis, it can be seen t...

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Abstract

The invention discloses a method for designing a channel state information reference signal (CSI-RS) in an LTE-A (Long Term Evolution-Advanced) system, belonging to the communication field and being used for measuring the CSI. The method comprises the following steps of: 1, RE capable of being used by the CSI-RS in a PRB; 2, multiplexing mode of the CSI-RS among ports of a cell; 3, CSI-RS mode when the port 5 is not used; 4, CSI-RS mode when the port 5 is used; and 5, allocation of the CSI-RS in a homogeneous network and a heterogeneous network. The method for designing the CSI-RS can not only ensure that a user of an LTE works well in an LTE-A network, reduce the influences on the user of the LTE because of adding the CSI-RS, but also ensures that the CSI-RS in the LTE-A system obtains abigger multiplexing factor, reduces the interference among the CSI-RSs, provides an orthorhombic CSI-RS for a CoMP measuring set, improves the accuracy of channel estimation and enhances the propertyof the system.

Description

technical field [0001] The invention belongs to the technical field of communication, and relates to a design of a channel state information reference signal (CSI-RS) for measuring channel state information (Channel State Information, CSI) in a Long Term Evolution-Advanced (LTE-A for short) system. Background technique [0002] In the LTE system, there are many types of downlink reference signals, each with different functions, such as the Sounding Reference Signal (SRS) used for downlink channel quality measurement, used for downlink channel estimation and user equipment (User Equipment for short) UE) coherently demodulated cell-specific reference signal CRS (Cell-specific Reference Signal), dedicated reference signal DRS (Dedicated Reference Signal) for beamforming, etc. [0003] Advanced LTE (Long Term Evolution-Advanced) is an evolved version of LTE Release-8. In addition to meeting or exceeding all relevant requirements of 3GPP TR 25.913, it must also meet or exceed the...

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Application Information

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IPC IPC(8): H04L1/06H04L25/02
Inventor 李兵兵刘明骞王彬彬同钊
Owner XIDIAN UNIV
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