Mapping method for special downlink pilot frequency and physical resource block

A technology of physical resource blocks and dedicated pilots, which is applied to the mapping field of downlink dedicated pilots and physical resource blocks, can solve the problems of beamforming weight feedback overhead and the inability of common pilots to obtain all channel information, so as to avoid feedback overhead. Effect

Active Publication Date: 2013-05-01
ZTE CORP
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AI Technical Summary

Problems solved by technology

[0004] As mentioned above, in the current version of the LTE standard, when the base station uses beamforming with more than 4 antennas, the common pilot cannot obtain all channel information, and there is a problem of feedback overhead of beamforming weights. A kind of New mapping method of downlink dedicated pilot and physical resource block

Method used

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  • Mapping method for special downlink pilot frequency and physical resource block
  • Mapping method for special downlink pilot frequency and physical resource block
  • Mapping method for special downlink pilot frequency and physical resource block

Examples

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example 1

[0054] Example 1: Downlink dedicated pilots can frequency hop together with common pilots

[0055] here, as image 3 As shown, since A=1, B=12, then M=9, N=6, G=4, that is to say, in the embodiment of the present invention, the downlink dedicated pilots are respectively mapped to the fourth , the 9th, and the 12th (B=12) OFDM symbols.

[0056] Based on the above content, the operation of performing the mapping processing of other downlink dedicated pilots in step S208 is specifically:

[0057] Mapping the second downlink dedicated pilot to the 12th OFDM symbol in the time domain, and mapping to the A+4=5th subcarrier in the frequency domain;

[0058] Mapping the third downlink dedicated pilot to the 12th OFDM symbol in the time domain, and mapping to the A+8=9th subcarrier in the frequency domain;

[0059] Mapping the fourth downlink dedicated pilot to the 9th OFDM symbol in the time domain, and mapping to the A+2=3 subcarrier in the frequency domain;

[0060] Mapping the ...

example 2

[0069] Example 2: Downlink dedicated pilots can frequency hop together with common pilots

[0070] Such as Figure 4(A) with 4(B) As shown, the size of the minimum physical resource block in the frame structure of the long cyclic prefix is ​​12 OFDM symbols in the time domain and 12 subcarriers in the frequency domain. The two common pilots are distributed in the first row of the minimum physical resource block, and the 4 rows, 7 and 10 rows.

[0071] (1) Control information occupies the first two OFDM symbols

[0072] Referring to FIG. 4(A), A=1, B=12, then M=9, N=6, G=3.

[0073] At this time, in step S208, the mapping methods and references of the first nine downlink dedicated pilots image 3 The mapping methods described are the same, and the mapping methods of the tenth to twelfth downlink dedicated pilots are as follows:

[0074] Mapping the tenth downlink dedicated pilot to the third OFDM symbol in the time domain, and mapping to the A+2=3th subcarrier in the frequ...

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Abstract

The invention discloses a mapping method for special downlink pilot frequency and a physical resource block. The method comprises the following processings: processing of frequency domain interval arrangement in which the frequency domain interval of the special downlink pilot frequency mapped to the same time domain is arranged as 3 subcarriers, processing of time domain interval arrangement in which the time domain interval of the special downlink pilot frequency mapped to different time domains is arranged as 2 OFDM marks, processing of initial mapping in which a first special downlink pilot frequency is mapped to corresponding positions, with initial positions being expressed by A and B, wherein A is the initial position of the frequency domain and B is the initial position of the time domain, and mapping processing of other special downlink pilot frequencies is performed according to the initial position, the frequency domain interval, the time domain interval and preset rules of the first special downlink pilot frequency. By the invention, the problem in the existing LTE standard version that public pilot frequency can not acquire all channel information is solved and expenditure for the feedback of beam formation weight is avoided.

Description

technical field [0001] The invention relates to a method for mapping downlink dedicated pilots and physical resource blocks in a long cyclic prefix frame structure in a long term evolution system (Long term evolution, LTE for short) in the field of mobile communications. Background technique [0002] In the current version of the LTE (Long term evolution, long-term evolution system) standard 3GPP (3rd Generation partnership project, third generation mobile communication partnership project) TR 36.211, the beamforming technology supporting single stream is specified, in order to distinguish beamforming and Precoding also clarifies the condition that beamforming is applied to the number of antennas greater than or equal to four. However, only four common pilots are defined in the current version of the LTE standard, so only four common pilots are used in practice, and the channel information of each antenna port is extracted from the corresponding common pilot. Therefore, whe...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04L25/02H04L27/26H04L1/06
Inventor 姜静孙云锋于辉
Owner ZTE CORP
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