Mapping method of downlink special pilot frequency and physical resource block

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

Active Publication Date: 2012-12-19
ZTE CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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

Examples

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Effect test

Embodiment 1

[0073] Such as image 3 It is a schematic diagram of the mapping relationship between the downlink dedicated pilot and the physical resource block in the case of A=2 and D=4. When A=2 and D=4, the downlink dedicated pilot can be mapped to the fourth one in the time domain respectively , the 8th, and the 12th OFDM symbols.

[0074] Based on the above content, the operation of performing the mapping processing of other downlink dedicated pilots in step S208 is specifically:

[0075] Mapping the second downlink dedicated pilot to the 4th OFDM symbol in the time domain, and mapping to the A+3=5th subcarrier in the frequency domain;

[0076] Mapping the third downlink dedicated pilot to the 4th OFDM symbol in the time domain, and mapping to the A+6=8th subcarrier in the frequency domain;

[0077] Mapping the fourth downlink dedicated pilot to the 4th OFDM symbol in the time domain, and mapping to the A+9=11th subcarrier in the frequency domain;

[0078] Mapping the fifth downlin...

Embodiment 2

[0087] Such as Figure 4 It is a schematic diagram of the mapping relationship between the downlink dedicated pilot and the physical resource block in the case of A=3 and D=4. When A=3 and D=4, the downlink dedicated pilot can be mapped to the fourth one in the time domain respectively , the 8th, and the 12th OFDM symbols.

[0088] Based on the above content, the operation of performing the mapping processing of other downlink dedicated pilots in step S208 is specifically:

[0089] Mapping the second downlink dedicated pilot to the 4th OFDM symbol in the time domain, and mapping to the A+3=6th subcarrier in the frequency domain;

[0090] Mapping the third downlink dedicated pilot to the 4th OFDM symbol in the time domain, and mapping to the A+6=9th subcarrier in the frequency domain;

[0091] Mapping the fourth downlink dedicated pilot to the 4th OFDM symbol in the time domain, and mapping to the A+9=12th subcarrier in the frequency domain;

[0092] Mapping the fifth downli...

Embodiment 3

[0101] Such as Figure 5 It is a schematic diagram of the mapping relationship between the downlink dedicated pilot and the physical resource block in the case of A=3 and D=4. When A=3 and D=4, the downlink dedicated pilot can be mapped to the fourth one in the time domain respectively , the 7th, and the 11th OFDM symbols.

[0102] Based on the above content, the operation of performing the mapping processing of other downlink dedicated pilots in step S208 is specifically:

[0103] Mapping the second downlink dedicated pilot to the 4th OFDM symbol in the time domain, and mapping to the A+3=6th subcarrier in the frequency domain;

[0104] Mapping the third downlink dedicated pilot to the 4th OFDM symbol in the time domain, and mapping to the A+6=9th subcarrier in the frequency domain;

[0105] Mapping the fourth downlink dedicated pilot to the 4th OFDM symbol in the time domain, and mapping to the A+9=12th subcarrier in the frequency domain;

[0106] Mapping the fifth downli...

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Abstract

The invention discloses a mapping method of a descending special pilot frequency and a physical resource block, which is used for mapping a descending special pilot frequency and a physical resource block in a long-period evolution system. The physical resource block comprises 12 subcarriers in frequency domains and comprises 12 orthometric frequency-division multiplexing symbols, namely OFDM symbols in time domains. The mapping method comprises the steps: setting the frequency domains at intervals, and setting frequency domain intervals of the descending special pilot frequency mapped to thesame time domain into two subcarriers; setting the time domains at intervals, and setting the time domain intervals into 2 or 3 OFDM symbols for the descending special pilot frequency mapped to the different time domains; treating the initial mapping, mapping the first descending special pilot frequency to an initial position; and mapping other descending special pilot frequencies according to the initial position, the frequency domain intervals and the time domain intervals of the descending special pilot frequency and a preset rule. The mapping method solves the problem that all channel information is unable to obtain when a wave beam formed by more than 4 antennae is adopted in a base station end.

Description

technical field [0001] The present invention relates to the communication field, in particular to a method and device for mapping downlink dedicated pilots and physical resource blocks. 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, when the number of antennas is greater than four, the real channel information of each an...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04L5/00
Inventor 姜静于辉
Owner ZTE CORP
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