Method, system and device for beam shaping transmission

• US 8,526,295 B2
• Filed: 05/26/2009
• Issued: 09/03/2013
• Est. Priority Date: 05/27/2008
• Status: Active Grant

• Current Assignee: Datang Mobile Communications Equipment Company Limited (China Information Communication Technology Group Co. Ltd.)
• Original Assignee: Datang Mobile Communications Equipment Company Limited (China Information Communication Technology Group Co. Ltd.)
• Inventors: Lin, Yanan, Suo, Shiqiang, Ding, Yu, Xiao, Guojun
• Primary Examiner(s): Ngo, Ricky
• Assistant Examiner(s): SAMUEL, DEWANDA A
• Application Number:
  US12/995,060
• Publication Number:
  US 20110122837A1
• Time in Patent Office: 1,561 Days
• Field of Search: 370/329, 370/203, 370/282, 370/302, 370/334, 370/337, 370/344, 370/343, 455/436, 375/260
• US Class Current: 370/203
• CPC Class Codes: H04B 7/0617 for beam forming

Abstract

The present invention discloses a method for beam forming transmission, comprising the following steps: the eNB mapping the downlink data of the user and the UE-specific reference signals carried in the DwPTS Field for beam forming transmission according to the preset mapping structure, and performing the beam forming process; the eNB performing the resource mapping on results of the beam forming process result, primary synchronization signal, control signaling, Cell specific reference signal and other user data to form the DwPTS Field data; and the eNB sending the DwPTS Field data to the UE. The present invention further discloses a system and a corresponding device for beam forming transmission. The present invention can realize beam forming transmission in the Special Field DwPTS and improve the performance of the system without introducing a new user UE-specific reference signal mapping structure, which is simple to be realized.

Claims

1. A method for beam forming transmission, comprising the following steps:

an eNB mapping downlink data of a user and UE-specific reference signals carried in a DwPTS Field for beam forming transmission according to a preset mapping structure, and performing a beam forming process;

the eNB performing a resource mapping for results of the beam forming process, primary synchronization signal, control signaling, Cell-specific reference signals and other user data to form the DwPTS Field data; and

the eNB sending the DwPTS Field data to the UE,

wherein the preset mapping structure depends upon the number of OFDM symbols carried in the DwPTS Field, and

wherein the number of OFDM symbols carried in the DwPTS Field depends upon the type of a cyclic prefix CP of the OFDM symbols and the specific configuration of the special subframe, and the eNB determines a length T of the DwPTS Field and a length To of one OFDM symbol according to the type of the CP and the specific configuration of the DwPTS Field, so as to obtain the number n of OFDM symbols carried in the DwPTS Field, wherein, n=T/To.

2. The method for beam forming transmission according to claim 1, wherein the mapping according to the preset mapping structure comprising the following steps:

the eNB determining a UE-specific reference signal mapping structure according to the type of the CP;

the eNB punctures the OFDM symbols after the n-th one in the UE-specific reference signal mapping structure and only reserving the first n OFDM symbols in the UE-specific reference signal mapping structure as the preset mapping structure; and

the eNB mapping the downlink data and the UE-specific reference signals according to the preset mapping structure on a physical resource block allocated to the user.

3. The method for beam forming transmission according to claim 2, wherein the control signaling is transmitted on the first OFDM symbol or the first and the second OFDM symbols in the DwPTS Field, and the primary synchronization signal is transmitted on the 72 central subcarriers of the third OFDM symbol in the DwPTS Field.

4. A method for beam forming transmission, wherein an UE receives DwPTS Field data sent from an eNB, wherein the DwPTS Field data include beam forming processing results, primary synchronization signal, control signaling, Cell-specific reference signals and other user data, and the beam forming processing results are obtained in the following manner:

the eNB mapping downlink data of user and UE-specific reference signals carried in the DwPTS Field for beam forming transmission according to a preset mapping structure, and performing a beam forming process,

wherein the preset mapping structure depends upon the number of OFDM symbols carried in the DwPTS Field, and

wherein the number of OFDM symbols carried in the DwPTS Field depends upon the type of CP of the OFDM symbols and the specific configuration of the special subframe, and the eNB determines a length T of the DwPTS Field and a length To of one OFDM symbol according to the type of the CP and the specific configuration of the special subframe, so as to obtain the number n of OFDM symbols carried in the DwPTS Field, wherein, n=T/To.

5. The method for beam forming transmission according to claim 4, wherein the mapping according to the preset mapping structure includes the following steps:

the eNB determining a UE-specific reference signal mapping structure according to the type of the CP;

the eNB punctures the OFDM symbols after the n-th one in the UE-specific reference signal mapping structure and only reserving the first n OFDM symbols in the UE-specific reference signal mapping structure as the preset mapping structure; and

the eNB mapping the downlink data and the UE-specific reference signals according to the preset mapping structure on a physical resource block allocated to the user.

6. The method for beam forming transmission according to claim 5, wherein the control signaling is transmitted on the first OFDM symbol or the first and the second OFDM symbols in the DwPTS Field, and the primary synchronization signal is transmitted on the 72 central subcarriers of the third OFDM symbol in the DwPTS Field.

7. A system for beam forming transmission, comprising an eNB and at least one UE,

the eNB being configured to map downlink data of a user and UE-specific reference signals carried in a DwPTS Field for beam forming transmission according to a preset mapping structure and performing a beam forming process, and to perform a resource mapping on results of the beam forming process, primary synchronization signal, control signaling, Cell-specific reference signals and other user data to form the DwPTS Field data;

and

the UE being configured to receive the DwPTS Field data,

wherein the preset mapping structure depends upon the number of OFDM symbols carried in the DwPTS Field, and

wherein the number of OFDM symbols carried in the DwPTS Field depends upon the type of CP of the OFDM symbols and the specific configuration of the special subframe, and the eNB determines a length T of the DwPTS Field and a length To of one OFDM symbol according to the type of the CP and the specific configuration of the special subframe, so as to obtain the number n of OFDM symbols carried in the DwPTS Field, wherein, n=T/To.

8. An eNB, comprising a data processing module and a transmitting module,

the data processing module being configured to map downlink data of a user and UE-specific reference signals carried in a DwPTS Field for beam forming transmission according to a preset mapping structure and perform a beam forming process, and to perform a resource mapping on results of the beam forming process, primary synchronization signal, control signaling, Cell-specific reference signals and other user data to form the DwPTS Field data;

and

the transmitting module being configured to transmit the DwPTS Field data obtained by the data processing module to the UE,

wherein the data processing module comprises a judging module, a resource mapping module and a beam forming processing module,

the judging module being configured to obtain an OFDM symbol number carried in the DwPTS Field to determine a length T of the DwPTS Field and a length To of one OFDM symbol according to the type of a CP of the OFDM symbols and a specific configuration of the special subframe, so as to obtain an OFDM symbol number n carried in the DwPTS Field, wherein, n=T/To;

the resource mapping module being configured to map the downlink data of the user and the UE-specific reference signals carried in the DwPTS Field for beam forming transmission according to the preset mapping structure and obtain the results of the beam forming process with the beam forming processing module, and to perform the resource mapping on the results of the beam forming process, primary synchronization signal, control signaling, Cell-specific reference signals and other user data to form the DwPTS Field data; and

the beam forming processing module being configured to perform the beam forming process on the downlink service data and the UE-specific reference signals that are mapped by the resource mapping module according to the preset mapping structure.

9. The eNB according to claim 8, wherein the resource mapping module further comprises a structure selecting module and a structure mapping module,

the structure selecting module being configured to determine a UE-specific reference signal mapping structure according to the type of the CP;

and

the structure mapping module being configured to puncture the OFDM symbols after the n-th one in the UE-specific reference signal mapping structure and to only reserve first n OFDM symbols in the UE-specific reference signal mapping structure as the preset mapping structure, and to map the downlink data and the UE-specific reference signals according to the preset mapping structure on a physical resource block allocated to the user.