Radio base station apparatus, mobile terminal apparatus, radio communication system and radio communication method

• US 9,756,633 B2
• Filed: 04/21/2016
• Issued: 09/05/2017
• Est. Priority Date: 05/02/2011
• Status: Active Grant

• Current Assignee: NTT Docomo Incorporated (Nippon Telegraph and Telephone Corporation)
• Original Assignee: NTT Docomo Incorporated (Nippon Telegraph and Telephone Corporation)
• Inventors: Abe, Tetsushi, Kishiyama, Yoshihisa, Nagata, Satoshi, Miki, Nobuhiko, Takeda, Kazuaki
• Primary Examiner(s): Jiang, Charles C
• Assistant Examiner(s): DEFAUW, THAD N
• Application Number:
  US15/135,029
• Publication Number:
  US 20160278056A1
• Time in Patent Office: 502 Days
• CPC Class Codes: H04B 7/0452 Multi-user MIMO systems
• CPC Class Codes: H04L 1/0027 Scheduling of signalling, e.g. occurrence thereof
• CPC Class Codes: H04L 1/0031 Multiple signaling transmission H04L1/1664, F15 take precedence
• CPC Class Codes: H04L 27/2626 Arrangements specific to the transmitter only
• CPC Class Codes: H04L 27/2647 Arrangements specific to the receiver only equalisation H04L27/01
• CPC Class Codes: H04L 5/001 the frequencies being arranged in component carriers
• CPC Class Codes: H04L 5/0023 Time-frequency-space
• CPC Class Codes: H04L 5/0053 Allocation of signaling, i.e. of overhead other than pilot signals
• CPC Class Codes: H04W 48/12 using downlink control channel
• CPC Class Codes: H04W 72/1273 of downlink data flows
• CPC Class Codes: H04W 72/23 in the downlink direction of a wireless link, i.e. towards a terminal
• CPC Class Codes: H04W 74/04 Scheduled access hybrid access H04W74/02

Abstract

The present invention is designed to provide a radio base station apparatus, a mobile terminal apparatus, a radio communication system and a radio communication method which can cope with an increased number of users. A radio base station apparatus is provided with: a signal generating section that generates a first downlink control signal and a second downlink control signal for a mobile terminal apparatus; a first multiplexing section that multiplexes the first downlink control signal on a control region up to a predetermined number of symbols from the top of a subframe; a second multiplexing section that frequency-division-multiplexes the second downlink control signal on radio resources from the next symbol in the control region to the last symbol of the subframe; and a transmission section that transmits the first downlink control signal multiplexed on the control region and the second downlink control signal multiplexed on the radio resources.

Claims

1. A radio communication method comprising the steps of:

generating a first downlink control signal to be transmitted to a mobile terminal apparatus by a physical downlink control channel and a second downlink control signal to be transmitted to the mobile terminal apparatus by an enhanced physical downlink control channel;

multiplexing the first downlink control signal on a radio resource of first n symbols (n=1, 2 or

     3) allocated to the physical downlink control channel in a subframe and frequency-division-multiplexing the second downlink control signal on a radio resource which is allocated to the enhanced physical downlink control channel and has predetermined symbols in a time domain following the symbols where the first downlink control signal is multiplexed in the subframe; and

transmitting the first downlink control signal by the physical downlink control channel and the second downlink control signal by the enhanced physical downlink control channel,

wherein, when CIF (Carrier Indicator Field) is configured, the second downlink control signal is multiplexed on a search space that is a resource of enhanced physical downlink control channel candidates determined based on a CIF value.

2. A radio communication method comprising the steps of:

receiving a first downlink control signal that is multiplexed on a radio resource of first n symbols (n=1, 2 or

     3) allocated to a physical downlink control channel in a subframe and a second downlink control signal that is frequency-division-multiplexed on a radio resource which is allocated to an enhanced physical downlink control channel and has predetermined symbols in a time domain following the symbols where the first downlink control signal is multiplexed in the subframe; and

when CIF (Carrier Indicator Field) is configured, determining a search space that is a resource of enhanced physical downlink control channel candidates based on a CIF value and performing blind decoding on the search space to detect the second downlink control signal.