Patents by Inventor Rakesh Tamrakar
Rakesh Tamrakar has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).
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Publication number: 20150092695Abstract: The present invention relates to the field of communications, and provides a method and a device for enhanced-physical downlink control channel (E-PDCCH) transmission and blind detection. The method is: a network side carrying out corresponding E-PDCCH transmission resource configuration for allocation of each sub-frame; and a terminal respectively adopting different modes to perform E-PDCCH blind detection in each frame, so that better link adaptation of the E-PDCCH transmission can be implemented. Therefore, the balance of E-PDCCH transmission in sub-frames is ensured, the effect of E-PDCCH blind detection of the terminal is further improved, and the E-PDCCH demodulation performance is further promoted.Type: ApplicationFiled: April 19, 2013Publication date: April 2, 2015Applicant: China Academy of Telecommunications TechnologyInventors: Rui Zhao, Xueming Pan, Rakesh Tamrakar, Ranran Zhang
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Patent number: 8982721Abstract: A method and apparatus for reporting channel state information (CSI) based on a physical uplink shared channel (PUSCH) are used to realize correct reporting of the CSI based on double code books. The method includes the following steps: a reporting mode configuration signaling for the CSI sent from a network side is received, and said reporting mode configuration signaling for the CSI at least carries a designated reporting mode identifier; a first CSI aiming at the whole bandwidth of a system is established according to a reporting type corresponding to said reporting mode identifier; the whole bandwidth of the system is divided into at least two frequency band subclasses, and a second CSI aiming at a designated frequency band subclass is established according to the reporting type corresponding to said reporting mode identifier; and when a reporting indication signaling sent from the network side is received, said first CSI and said second CSI are transmitted to the network side.Type: GrantFiled: May 6, 2011Date of Patent: March 17, 2015Assignee: China Academy of Telecommunications TechnologyInventors: Xin Su, Deshan Miao, Ranran Zhang, Meifang Jing, Qiubin Gao, Shaohui Sun, Guojun Xiao, Rakesh Tamrakar
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Publication number: 20150016386Abstract: The present disclosure provides a method and an apparatus for determining number of ePDCCH resource units. The method includes: determining number of symbols occupied by PDCCH, number of CRS ports, number of DMRS ports and CSI-RS configuration in a subframe; and determining resources available for transmitting an ePDCCH in PDSCH area of the subframe according to the number of symbols occupied by the PDCCH, the number of CRS ports, the number of DMRS ports and the CSI-RS configuration.Type: ApplicationFiled: March 7, 2013Publication date: January 15, 2015Applicant: CHINA ACADEMY OF TELECOMMUNICATIONS TECHNOLOGYInventors: Rakesh Tamrakar, Xueming Pan, Rui Zhao, Ranran Zhang
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Publication number: 20140369436Abstract: Disclosed are a precoding matrix indicator (PMI) information transmission method and device, for realizing the feedback and receiving of PMIs. The PMI information feedback method provided in the present application server includes: UE determining the feedback of a PMI and a feedback mode used for feeding back the PMI; the UE determining a rank indicator (RI) and a precoding matrix in a compressed precoding matrix set and determining an RI and first PMI combined coding information value according to a preset RI and first PMI combined coding information value and a correlation list of RIs and codebook indices; and the UE employing the feedback mode to send the determined RI and first PMI combined coding information value to a base station.Type: ApplicationFiled: June 29, 2012Publication date: December 18, 2014Applicant: China Academy of Telecommunications TechnologyInventors: Ranran Zhang, Xin Su, Rakesh Tamrakar, Meifang Jing
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Publication number: 20140313994Abstract: Disclosed in the invention are a method and a device for transmitting downlink control information (DCI). The method comprises: processing the downlink control information to generate downlink control information code words; scrambling and modulating the downlink control information code words in turn to generate a modulation symbol sequence; mapping the modulation symbol sequence to v data layers, wherein v is an integer which is more than or equal to 1; mapping modulation symbols on the v data layers to a demodulation reference signal (DMRS) antenna port; and mapping the modulation symbols on the DMRS antenna port to a physical antenna and sending to user equipment (UE). According to the method and the device of the invention, multi-layer data transmission can be supported, the transmission mode is more flexible, and transmission efficiency is higher.Type: ApplicationFiled: August 22, 2012Publication date: October 23, 2014Applicant: China Academy of Telecommunications TechnologyInventors: Xin Su, Ranran Zhang, Meifang Jing, Rakesh Tamrakar
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Patent number: 8855068Abstract: A method and a system for coordinated transmission, and a mobile terminal and network side device are provided. The method for coordinated transmission includes: reporting by the terminal of a signal measurement result; determining the coordinated transmission state of the terminal according to the signal measurement result; and providing transmission service for the terminal according to the determined transmission state.Type: GrantFiled: January 13, 2010Date of Patent: October 7, 2014Assignee: China Academy of Telecommunications TechnologyInventors: Fei Qin, Jinbo Zhao, Shaohui Sun, Li Liu, Qiubin Gao, Rakesh Tamrakar, Chun Luo
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Patent number: 8855229Abstract: The present invention discloses a method for transmitting information in a closed loop multiple antenna system. The method includes that: a transmission apparatus receives information transmitted from a reception apparatus, wherein the information includes codeword index information; the transmission apparatus selects a corresponding codeword from a double-layer-structure-based codebook according to the codeword index information; the transmission apparatus generates a precoding matrix according to the selected codeword; the transmission apparatus performs precoding for data to be transmitted according to the precoding matrix; the transmission apparatus transmits the precoded data to the reception apparatus. The present invention can enable a formed and used codebook to match channel distribution characteristic of a dual-polarized antenna as much as possible, and minimize performance loss brought by codebook quantization, thereby performance of a precoding system can be effectively improved.Type: GrantFiled: January 31, 2011Date of Patent: October 7, 2014Assignee: China Academy of Telecommunications TechnologyInventors: Ranran Zhang, Deshan Miao, Qiubin Gao, Meifang Jing, Rakesh Tamrakar
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Patent number: 8837371Abstract: A demodulation reference signal port mapping method is disclosed. The method includes: a base station communicates with a User Equipment (UE), and allocates corresponding data stream to the UE according to the attribution of the UE; the base station maps the corresponding data stream from a layer to a corresponding demodulation reference signal port; the base station transmits the corresponding data stream to the UE via demodulation reference signal port. By restricting the demodulation reference signal port mapping solution of rank=1 to rank=8 and the demodulation reference signal port mapping solution when the retransmission occurs, the technical solution enables the demodulation reference signal port mapping solution to be compatible with the present system and to keep lower overhead of the demodulation reference signal.Type: GrantFiled: January 31, 2011Date of Patent: September 16, 2014Assignee: China Academy of Telecommunications TechnologyInventors: Xin Su, Deshan Miao, Rakesh Tamrakar
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Patent number: 8705482Abstract: The present invention discloses a method and device of reporting channel state information, including: user terminal selects the codebook used in reporting precoding matrix indicator (PMI) from double-stage codebook and selects PMI from the codebook; double-stage codebook involves codebook reflecting long-term/broadband information and that reflecting short-term/frequency selective channel information; and user terminal calculates channel quality indication; therein, when reporting through physical uplink control channel (PUCCH), the parameter used in calculating channel quality indication (CQI) includes the precoding matrix indicator (PMI) reported by user terminal through physical uplink shared channel (PUSCH); when reporting through physical uplink shared channel (PUSCH), the parameter used in calculating CQI includes the precoding matrix indicator (PMI) reported by user terminal through physical uplink control channel (PUCCH); user terminal selects the PMI and calculates CQI according to the specified repType: GrantFiled: April 27, 2011Date of Patent: April 22, 2014Inventors: Shaohui Sun, Xin Su, Deshan Miu, Ranran Zhang, Meifang Jing, Qiubin Gao, Guojun Xiao, Rakesh Tamrakar
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Publication number: 20140050276Abstract: Disclosed in an embodiment of the present invention is a method for transmitting channel state information and device thereof. By applying the technical schemes of the embodiment of the present invention, in a LTE-A system using PUCCH reporting mode 1-1, in a situation where PMI feedback for 8 antenna ports is needed to be reported in a sub-frame and PUCCH capacity is limited, therefore codebook compression is required, a corresponding relationship definition of the pre-coding matrix indicator information or the pre-coding matrix indicator information pair and the codebook index or the codebook index pair after codebook compression is provided, thus realizing the feedback and receiving of channel state information between a base station and terminal equipment.Type: ApplicationFiled: November 8, 2011Publication date: February 20, 2014Applicant: DATANG MOBILE COMMUNICATIONS EQUIPMENT CO., LTDInventors: Ranran ZHANG, Qiubin GAO, Meifang JING, Rakesh TAMRAKAR, Guojun XIAO
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Publication number: 20140029463Abstract: Disclosed are a method for reporting channel quality information and a device thereof, the method comprising: according to configuration information of a CSI-RS, a user equipment measuring the CSI-RS to acquire a downlink channel transmission matrix; according to a PDSCH transmission scheme used as a basis when determining a Channel Quality Indicator (CQI), and according to the measured downlink channel transmission matrix, the user equipment determining the CQI of a frequency domain reporting unit; and the user equipment reporting the determined CQI to a network side. Through the present invention, the measurement and reporting of the channel quality information based on the CSI-RS is implemented based on transmission of non-PMI feedback.Type: ApplicationFiled: November 8, 2011Publication date: January 30, 2014Applicant: DATANG MOBILE COMMUNICATIONS EQUIPMENT CO., LTDInventors: Xin Su, Qiubin Gao, Rakesh Tamrakar, Zukang Shen, Shaohui Sun
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Publication number: 20140016496Abstract: A method and a device for reporting channel quality information are provided by the present invention, the method comprising that: measuring, by a user equipment (UE), Channel State Information-Reference Signal (CSI-RS) according to the configuration information of the CSI-RS, to acquire a downlink channel transport matrix (101); determining, by the UE, Channel Quality Indicator (CQI) of a frequency domain reporting unit according to the number of CSI-RS ports and the corresponding transmission scheme of the Physical Downlink Shared Channel (PDSCH) used when determining the CQI, and the downlink channel transport matrix acquired by measurement (102); reporting, by the UE, the determined CQI to network side (103). The present invention can realize measurement and reporting of CSI-RS-based channel quality information on the basis of non-Precoding Matrix Indicator (PMI) feedback transmissions.Type: ApplicationFiled: October 13, 2011Publication date: January 16, 2014Applicant: DATANG MOBILE COMMUNICATIONS EQUIPMENT CO., LTDInventors: Xin Su, Qiubin Gao, Rakesh Tamrakar, Zukang Shen, Shaohui Sun
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Publication number: 20130343216Abstract: There is disclosed method for reporting channel state so as to report channel state based upon CSI-RS.Type: ApplicationFiled: November 30, 2011Publication date: December 26, 2013Inventors: Xin Su, Qiubin Gao, Rakesh Tamrakar, Zukang Shen
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Publication number: 20130215841Abstract: The present invention discloses a method and device of reporting channel state information, including: user terminal selects the codebook used in reporting precoding matrix indicator (PMI) from double-stage codebook and selects PMI from the codebook; double-stage codebook involves codebook reflecting long-term/broadband information and that reflecting short-term/frequency selective channel information; and user terminal calculates channel quality indication; therein, when reporting through physical uplink control channel (PUCCH), the parameter used in calculating channel quality indication (CQI) includes the precoding matrix indicator (PMI) reported by user terminal through physical uplink shared channel (PUSCH); when reporting through physical uplink shared channel (PUSCH), the parameter used in calculating CQI includes the precoding matrix indicator (PMI) reported by user terminal through physical uplink control channel (PUCCH); user terminal selects the PMI and calculates CQI according to the specified repType: ApplicationFiled: April 27, 2011Publication date: August 22, 2013Applicant: CHINA ACADEMY OF TELECOMMUNICATIONS TECHNOLOGYInventors: Shaohui Sun, Xin Sun, Deshan Miu, Ranran Zhang, Meifang Jing, Qiubin Gao, Guojun Xiao, Rakesh Tamrakar
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Publication number: 20130201971Abstract: The present invention discloses a transmission method and apparatus for non-periodic SRS. eNB configures time-domain configuration parameter of non-periodic SRS through higher layer signalling or downlink physical control channel signalling; terminal equipment transmits non-periodic SRS in indicated time-domain resource. The application of the technical solution of the embodiments of the present invention can reduce signalling consumption through high layer semi-static configuration of time-domain resource of non-periodic SRS. On one hand, flexible non-periodic SRS time-domain transmission is allowed for terminal equipment which can send non-periodic SRS in multiple subframes, which is featured by low sounding delay and great sounding bandwidth; on the other hand, flexible timing mode is also permitted for terminal equipment which brings little restriction to scheduling.Type: ApplicationFiled: May 17, 2011Publication date: August 8, 2013Applicant: China Academy of Telecommunications TechnologyInventors: Wenhong Chen, Rakesh Tamrakar, Guojun Xiao
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Publication number: 20130163687Abstract: The present invention discloses a method and device for processing codebook subset restriction, which includes: the codebooks for every rank of N antenna ports are grouped, wherein N is a natural number; after grouping, the status of each group is identified as restricted or unrestricted by using one bit. The present invention can reduce the signaling overhead needed for codebook subset restriction.Type: ApplicationFiled: September 16, 2011Publication date: June 27, 2013Applicant: China Academy of Telecommunications TechnologyInventors: Meifang Jing, Qiubin Gao, Ranran Zhang, Shaohui Sun, Guojun Xiao, Rakesh Tamrakar
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Publication number: 20130044624Abstract: A method and apparatus for reporting channel state information (CSI) based on a physical uplink shared channel (PUSCH) are used to realize correct reporting of the CSI based on double code books. The method includes the following steps: a reporting mode configuration signaling for the CSI sent from a network side is received, and said reporting mode configuration signaling for the CSI at least carries a designated reporting mode identifier; a first CSI aiming at the whole bandwidth of a system is established according to a reporting type corresponding to said reporting mode identifier; the whole bandwidth of the system is divided into at least two frequency band subclasses, and a second CSI aiming at a designated frequency band subclass is established according to the reporting type corresponding to said reporting mode identifier; and when a reporting indication signaling sent from the network side is received, said first CSI and said second CSI are transmitted to the network side.Type: ApplicationFiled: May 6, 2011Publication date: February 21, 2013Inventors: Xin Su, Deshan Miao, Ranran Zhang, Meifang Jing, Qiubin Gao, Shaohui Sun, Guojun Xiao, Rakesh Tamrakar
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Publication number: 20130022087Abstract: A method, an apparatus and a system for configuring a Demodulation Reference Signal (DMRS) are disclosed in the present invention. The method includes: receiving a DMRS indication index transmitted from a network side; determining at least one port used for the local transmission of the DMRS; acquiring the predetermined DMRS configuration parameters corresponding to the DMRS indication index and the at least one port, and configuring, according to the DMRS configuration parameters, the DMRS to be transmitted from the at least one port. Therefore, the terminal can implement the configuration of the DMRS without reloading the corresponding configuration information. Thus, the implementation complexity of the DMRS configuration flow is decreased, and the operation load of the terminal is also reduced.Type: ApplicationFiled: April 25, 2011Publication date: January 24, 2013Applicant: CHINA ACADEMY OF TELECOMMUNICATIONS TECHNOLOGYInventors: Wenhong Chen, Deshan Miao, Rakesh Tamrakar
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Publication number: 20120307935Abstract: The present invention discloses a method for transmitting information in a closed loop multiple antenna system. The method includes that: a transmission apparatus receives information transmitted from a reception apparatus, wherein the information includes codeword index information; the transmission apparatus selects a corresponding codeword from a double-layer-structure-based codebook according to the codeword index information; the transmission apparatus generates a precoding matrix according to the selected codeword; the transmission apparatus performs precoding for data to be transmitted according to the precoding matrix; the transmission apparatus transmits the precoded data to the reception apparatus. The present invention can enable a formed and used codebook to match channel distribution characteristic of a dual-polarized antenna as much as possible, and minimize performance loss brought by codebook quantization, thereby performance of a precoding system can be effectively improved.Type: ApplicationFiled: January 31, 2011Publication date: December 6, 2012Applicant: CHINA ACADEMY OF TELECOMMUNICATIONS TECHNOLOGYInventors: Ranran Zhang, Deshan Miao, Qiubin Gao, Meifang Jing, Rakesh Tamrakar
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Publication number: 20120300709Abstract: A demodulation reference signal port mapping method is disclosed. The method includes: a base station communicates with a User Equipment (UE), and allocates corresponding data stream to the UE according to the attribution of the UE; the base station maps the corresponding data stream from a layer to a corresponding demodulation reference signal port; the base station transmits the corresponding data stream to the UE via demodulation reference signal port. By restricting the demodulation reference signal port mapping solution of rank=1 to rank=8 and the demodulation reference signal port mapping solution when the retransmission occurs, the technical solution enables the demodulation reference signal port mapping solution to compatible with the present system and to keep lower overhead of the demodulation reference signal.Type: ApplicationFiled: January 31, 2011Publication date: November 29, 2012Applicant: China Academy of Telecommunications TechnologyInventors: Xin Su, Deshan Miao, Rakesh Tamrakar