A mapping method and device from PHICH to physical sub-carrier
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A mapping method and sub-carrier technology, applied in the field of communication, to achieve the effect of ensuring diversity gain and little impact on performance
Inactive Publication Date: 2013-05-08
ZTE CORP
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[0006] The present invention aims to provide a method and device for mapping PHICH to physical subcarriers, which can solve the problem of mapping physical subcarriers of PHICH in the prior art
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example 1
[0088] First, divide the resource units after removing the pilot on the first 3 OFDM symbols into physical resource groups, and number them in the order of the time domain and then the frequency domain, such as figure 1 As shown, then, renumber the remaining physical resource groups after removing the physical resource group corresponding to the PCFICH on the first OFDM, and establish a correspondence between the new number and the initial number.
[0089] In the case of mapping the correct acknowledgment message and / or the error acknowledgment message to 3 OFDM symbols, the initial physical resource group numbers corresponding to the PCFICH on the first OFDM symbol are 4, 46, 88 and 130.
[0090] NT=3; l ( i , m ) = ( i + m + N ID Cell ) ...
example 2
[0102] First, divide the resource units after removing the pilot on the first OFDM symbol into physical resource groups, and number them in the order of the time domain and then the frequency domain, such as image 3 As shown, then, renumber the remaining physical resource groups after removing the physical resource group corresponding to the PCFICH on the first OFDM, and establish a correspondence between the new number and the initial number.
[0103] In the case of mapping the correct acknowledgment message and / or the error acknowledgment message to 3 OFDM symbols, the initial physical resource group numbers corresponding to the PCFICH on the first OFDM symbol are 1, 13, 25 and 37.
[0104] N T = 1; l(i, m) = 0
[0105] l(0,1)=0; l(1,1)=0; l(2,1)=0;
[0106] N Total = 2 × N RB DL - 4 = 2 × 25 ...
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Abstract
The invention provides a method and a device for mapping from an indication channel PHICH which has physical mixture and can automatically request for retransmission to a physical subcarrier, and the method comprises a time domain mapping step that on a time domain, when the PHICH duration is three OFDM symbols, each OFDM symbol is mapped with one resource; when the PHICH duration is two OFDM symbols, by using two continuous PHICH groups as a period, one resource group is mapped to the first OFDM symbol by the first PHICH group, and two resource groups are mapped to the second OFDM symbol by the first PHICH group, while two resource groups are mapped to the first OFDM symbol by the second PHICH group, and one resource group is mapped to the second OFDM symbol by the second PHICH group. The invention ensures the diversity gain of PHICH and the simplicity for implementing PHICH, and at the same time, the invention has little influence on the performance of other downlink physical channels.
Description
technical field [0001] The present invention relates to the field of communications, and in particular, to a method and device for mapping a Physical Hybrid ARQ Indicator Channel (PHICH) to a physical subcarrier. Background technique [0002] In a Hybrid Automatic Repeat Request (HARQ) mode, the code sent by the originating end can not only detect errors, but also have certain error correction capabilities. After receiving the codeword, the decoder at the receiving end first checks the error situation, and if it is within the error correction capability of the code, it will automatically correct the error; The receiving end sends a decision signal to the sending end through the feedback channel, requesting the sending end to resend the information. In the OFDM system, correct acknowledgment message / error acknowledgment message (ACK / NACK) control signaling is used to indicate whether the transmission is correct or wrong, and to determine whether retransmission is required. ...
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