Abstract: A communication system is presented in which a base station is provided for communicating with a plurality of mobile communication devices in a cellular communication system. The base station operates one of more communication cells and communicates subframes, with each of the plurality of communication devices within the cell(s), each comprising the communication resources of a control region for communicating a control channel and the communication resources of a data region for communicating a respective data channel. The base station communicates a control channel having a first DMRS sequence in a control region of some subframes and a control channel having a second DMRS sequence in a control region of other subframes. The second control channel may be transmitted in a radio beam focused spatially in a direction of a communication device. The first control channel may be transmitted omnidirectionally throughout the cell(s).

Abstract: A communication system is presented in which a base station is provided for communicating with a plurality of mobile communication devices in a cellular communication system. The base station operates one of more communication cells and communicates subframes, with each of the plurality of communication devices within the cell(s), each comprising the communication resources of a control region for communicating a control channel and the communication resources of a data region for communicating a respective data channel. The base station communicates a control channel having a first DMRS sequence in a control region of some subframes and a control channel having a second DMRS sequence in a control region of other subframes. The second control channel may be transmitted in a radio beam focussed spatially in a direction of a communication device. The first control channel may be transmitted omnidirectionally throughout the cell(s).

Abstract: An object of the present disclosure is to provide a base station, a system, a method, and a program capable of improving DL MU-MIMO characteristics. A base station according to the present disclosure includes: a calculation unit that calculates a spatial multiplexing antenna weight VJL of each of a plurality of antennas owned by the base station based on information about at least one spatial multiplexing terminal and Down Link (DL) channel information of the at least one spatial multiplexing terminal; and an interference elimination unit that calculates an interference elimination antenna weight WJL that reduces interference power with respect to other terminals to a desired level or lower based on the spatial multiplexing antenna weight VJL, and calculates a desired signal power loss PLJL of the at least one spatial multiplexing terminal based on the spatial multiplexing antenna weight VJL and the interference elimination antenna weight WJL.

Abstract: In order to improve communication in a radio access network, a base station 100 includes: a first communication processing unit 141 configured to communicate with a terminal apparatus 400A; and a second communication processing unit 143 configured to receive, from base stations 200 and 300 respectively communicating with terminal apparatuses 400B and 400C, radio resource time length information for specifying a time length of a radio resource for the terminal apparatuses 400B and 400C, and hopping pattern information for specifying a frequency hopping pattern for the terminal apparatuses 400B and 400C. The first communication processing unit 141 is configured to determine the frequency hopping pattern for the terminal apparatus 400A, based on the radio resource time length information and the hopping pattern information, and communicate with the terminal apparatus 400A in accordance with the determined frequency hopping pattern.

Abstract: A communication system is presented in which a base station is provided for communicating with a plurality of mobile communication devices in a cellular communication system. The base station operates one of more communication cells and communicates subframes, with each of the plurality of communication devices within the cell(s), each comprising the communication resources of a control region for communicating a control channel and the communication resources of a data region for communicating a respective data channel. The base station communicates a control channel having a first DMRS sequence in a control region of some subframes and a control channel having a second DMRS sequence in a control region of other subframes. The second control channel may be transmitted in a radio beam focussed spatially in a direction of a communication device. The first control channel may be transmitted omnidirectionally throughout the cell(s).

Abstract: Even if the channel reciprocity established between the uplink and the downlink is deteriorated, control the transmission in the downlink is performed properly. A base station 100 includes: an information obtaining unit 143 configured to obtain downlink channel information based on a downlink channel estimate, and uplink channel information based on an uplink channel estimate; and a control unit 145 configured to perform control related to transmission in downlink channel based on a correlation between the downlink channel information and the uplink channel information.

Abstract: A communication system is presented in which a base station is provided for communicating with a plurality of mobile communication devices in a cellular communication system. The base station operates one of more communication cells and communicates subframes, with each of the plurality of communication devices within the cell(s), each comprising the communication resources of a control region for communicating a control channel and the communication resources of a data region for communicating a respective data channel. The base station communicates a control channel having a first DMRS sequence in a control region of some subframes and a control channel having a second DMRS sequence in a control region of other subframes. The second control channel may be transmitted in a radio beam focussed spatially in a direction of a communication device. The first control channel may be transmitted omnidirectionally throughout the cell(s).

Abstract: An object of the present disclosure is to provide a base station, a system, a method, and a program capable of improving DL MU-MIMO characteristics.

Abstract: In order to improve communication in a radio access network, a first base station according to an aspect of the present invention includes: an information obtaining unit configured to obtain hopping pattern control information related to a pattern of frequency hopping for a terminal apparatus; and a first communication processing unit configured to transmit the hopping pattern control information to a second base station.

Abstract: Even if the channel reciprocity established between the uplink and the downlink is deteriorated, control the transmission in the downlink is performed properly. A base station 100 includes: an information obtaining unit 143 configured to obtain downlink channel information based on a downlink channel estimate, and uplink channel information based on an uplink channel estimate; and a control unit 145 configured to perform control related to transmission in downlink channel based on a correlation between the downlink channel information and the uplink channel information.

Abstract: A communication system is presented in which a base station is provided for communicating with a plurality of mobile communication devices in a cellular communication system. The base station operates one of more communication cells and communicates subframes, with each of the plurality of communication devices within the cell(s), each comprising the communication resources of a control region for communicating a control channel and the communication resources of a data region for communicating a respective data channel. The base station communicates a control channel having a first DMRS sequence in a control region of some subframes and a control channel having a second DMRS sequence in a control region of other subframes. The second control channel may be transmitted in a radio beam focussed spatially in a direction of a communication device. The first control channel may be transmitted omnidirectionally throughout the cell(s).

Abstract: A communication system is presented in which a base station is provided for communicating with a plurality of mobile communication devices in a cellular communication system. The base station operates one of more communication cells and communicates subframes, with each of the plurality of communication devices within the cell(s), each comprising the communication resources of a control region for communicating a control channel and the communication resources of a data region for communicating a respective data channel. The base station communicates a control channel having a first DMRS sequence in a control region of some subframes and a control channel having a second DMRS sequence in a control region of other subframes. The second control channel may be transmitted in a radio beam focussed spatially in a direction of a communication device. The first control channel may be transmitted omnidirectionally throughout the cell(s).

Abstract: A New Radio (NR) system and a method for transmitting sounding reference signals in a new radio communications system is provided that enables mutual orthogonality to be maintained between SRS resources of different UEs. The system an eNodeB and a plurality of UEs, and the method includes: generating, at a UE, a base sequence based upon a sequence number received from the eNodeB; generating a plurality of blocks from the base sequence by applying cyclic-shifts to the base sequence; and generating a sounding reference signal by concatenating the cyclically shifted blocks. The sounding reference signal is then transmitted to the eNodeB. By using the same Zadoff-Chu base sequence with different cyclic shifts among overlapped UEs, mutual orthogonality of the SRS of each UE is maintained.

Abstract: A relay communications system is described in which a base station is able to support both Frequency diversity Relay Physical Downlink Control Channel (R-PDCCH) transmission and Frequency selective R-PDCCH transmission either within different cells, or within the same cell but not the same sub-frame or within the same cell and within the 5 same sub-frame.

Abstract: A method of scheduling transmission in a MIMO system is provided that includes joint UE and rank selection. The method comprises selecting, at a base station, a UE of a plurality of candidate UEs and a MIMO rank for the selected UE according to an inter-UE interference between the selected UE at the MIMO rank and one or more scheduled UEs. The selected UE is then scheduled for transmission, at the MIMO rank, with the scheduled UEs.

Abstract: To provide a communication terminal capable of suppressing an increase in power consumption of a UE during multi-subframe scheduling, a communication terminal (10) includes a monitoring unit (11) that monitors control information containing allocation information of at least one subframe where downlink data is transmitted, and a control unit (12) that determines monitoring timing to monitor the control information in accordance with a decoding result of downlink data transmitted using the at least one subframe. The monitoring unit (11) monitors the control information at the determined monitoring timing.

Abstract: A relay communications system is described in which a base station is able to support both Frequency diversity Relay Physical Downlink Control Channel (R-PDCCH) transmission and Frequency selective R-PDCCH transmission either within different cells, or within the same cell but not the same sub-frame or within the same cell and within the 5 same sub-frame.

Abstract: A relay communications system is described in which a base station is able to support both Frequency diversity Relay Physical Downlink Control Channel (R-PDCCH) transmission and Frequency selective R-PDCCH transmission either within different cells, or within the same cell but not the same sub-frame or within the same cell and within the 5 same sub-frame.

Abstract: A MIMO system (100) and a method of generating a precoder for use in a MIMO system (100), when communicating with a UE (115), are provided. The method comprises receiving, from the UE (115), channel information relating to a channel on which data is transmitted; decomposing the channel information into components representing a transmission component and a signal strength component; and generating the precoder according to the transmission component and the signal strength component.

Abstract: A method and system for data communication in a Multi-user Multiple-Input and Multiple-Output (MU-MIMO) system is provided. The method includes receiving, from a first UE of the plurality of UEs, first and second channel information relating to first and second subsets of antennae; generating first and second sub-precoders according to the first and second channel information; generating a precoder according at least in part to the first and second sub-precoders; and transmitting data to the first UE using the precoder.