Radio base station apparatus, mobile terminal apparatus, radio communication method and radio communication system
地域：
Tokyo
摘要
To enable a mobile terminal apparatus to correctly demodulate a data signal in the case of applying Coordinated Multi-Point transmission (CoMP), particularly, JP-CoMP, a radio communication method of the invention is characterized in that a radio base station apparatus generates information for demodulation of a data signal in a mobile terminal apparatus in applying Coordinated Multi-Point transmission, and transmits the information for demodulation to a mobile terminal apparatus that performs Coordinated Multi-Point reception, and that the mobile terminal apparatus receives the information for demodulation of a data signal, and demodulates the data signal subjected to Coordinated Multi-Point reception using the information for demodulation.
說明書
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The present invention relates to a radio base station apparatus, mobile terminal apparatus, radio communication method and radio communication system, and more particularly, to a radio base station apparatus, mobile terminal apparatus, radio communication method and radio communication system for performing Coordinated Multi-Point (CoMP) transmission/reception.
In UMTS (Universal Mobile Telecommunications System) networks, for the purpose of improving spectral efficiency and further improving data rates, by adopting HSDPA (High Speed Downlink Packet Access) and HSUPA (High Speed Uplink Packet Access), it is performed exploiting maximum features of the system based on W-CDMA (Wideband Code Division Multiple Access). For the UMTS network, for the purpose of further increasing high-speed data rates, providing low delay and the like, Long Term Evolution (LTE) has been studied (Non-patent Document 1).
In the 3G system, a fixed band of 5 MHz is substantially used, and it is possible to achieve transmission rates of approximately maximum 2 Mbps in downlink. Meanwhile, in the LTE-scheme system, using variable bands ranging from 1.4 MHz to 20 MHz, it is possible to achieve transmission rates of maximum 300 Mbps in downlink and about 75 Mbps in uplink. Further, in the UMTS network, for the purpose of further increasing the wide-band and high speed, successor systems to LTE have been studied (for example, LTE Advanced (LTE-A)). For example, in LTE-A, it is scheduled to increase 20 MHz that is the maximum system band in LTE specifications to about 100 MHz.
權利要求
The invention claimed is:1. A radio base station apparatus comprising:a processor that, in applying Coordinated Multi-Point (CoMP) transmission, generates information for demodulation of a data signal in a mobile terminal apparatus; and a transmitter that transmits the information for demodulation to the mobile terminal apparatus that performs Coordinated Multi-Point reception, wherein the transmitter includes information for demodulation in downlink control information (DCI) and transmits the DCI on PDCCH, wherein the information for demodulation includes information on a frequency shift of a cell-specific reference signal (CRS) of each cell and information on a multiplexing starting position of a physical downlink shared channel (PDSCH) signal of the cell, and wherein the information for demodulation corresponds to one or more PDCCH symbol lengths and the PDCCH symbol length for each cell of the plurality of cells is configured respectively based on the information for demodulation. 2. The radio base station apparatus according to claim 1 , wherein the frequency shift of the CRS is associated with bits included in the DCI. 3. The radio base station apparatus according to claim 2 , wherein the frequency shift is used to define a multiplexing position of the CRS. 4. The radio base station apparatus according to claim 1 , wherein the multiplexing starting position of the PDSCH signal is associated with bits included in the DCI. 5. The radio base station apparatus according to claim 1 , wherein the DCI is associated with cell identification information of the CoMP cell having a possibility of applying Coordinated Multi-Point transmission, and the information on the frequency shift is notified with the cell identification information of the CoMP cell transmitted by higher-layer signaling and the DCI corresponding to information of the CoMP cell. 6. The radio base station apparatus according to claim 1 , wherein the information on the frequency shift of the CRS and/or the information on the multiplexing starting position of the PDSCH signal is notified by higher-layer signaling. 7. The radio base station apparatus according to claim 1 , wherein the multiplexing starting position of the PDSCH is used as the information for demodulation, and the PDCCH symbol length for the plurality of cells is configured respectively for each cell. 8. A mobile terminal apparatus comprising:a receiver that receives information for demodulation of a data signal from a serving cell in applying Coordinated Multi-Point transmission; and a demodulator that demodulates the data signal subjected to Coordinated Multi-Point reception using the information for demodulation, wherein the receiver receives information for demodulation transmitted on PDCCH, wherein the information for demodulation is downlink control information (DCI) and includes information on a frequency shift of a cell-specific reference signal (CRS) of each cell and information on a multiplexing starting position of a physical downlink shared channel (PDSCH) signal of the cell, and wherein the information for demodulation corresponds to one or more PDCCH symbol lengths, and the PDCCH symbol length for each cell of the plurality of cells is configured respectively based on the information for demodulation. 9. The mobile terminal apparatus according to claim 8 , further comprising:a table in which the frequency shift of the CRS is associated with bits included in the DCI, wherein the demodulator recognizes the frequency shift of the CRS from the bits notified by the DCI to demodulate the data signal. 10. The mobile terminal apparatus according to claim 8 , further comprising:a table in which the multiplexing starting position of the PDSCH signal is associated with bits included in the DCI, wherein the demodulator recognizes the multiplexing starting position of the PDSCH signal from the bits notified by the DCI to demodulate the data signal. 11. A radio communication method comprising:in a radio base station apparatus:generating information for demodulation of a data signal in a mobile terminal apparatus by applying Coordinated Multi-Point (CoMP) transmission; and transmitting the information for demodulation to the mobile terminal apparatus that performs Coordinated Multi-Point reception; and in the mobile terminal apparatus:receiving the information for demodulation of the data signal; and demodulating the data signal subjected to Coordinated Multi-Point reception using the information for demodulation; wherein the radio base station apparatus includes information for demodulation in downlink control information (DCI) and transmits the DCI on PDCCH, wherein the information for demodulation includes information on a frequency shift of a cell-specific reference signal (CRS) of each cell and information on a multiplexing starting position of a physical downlink shared channel (PDSCH) signal of the cell, and wherein the information for demodulation corresponds to one or more PDCCH symbol lengths and the PDCCH symbol length for each cell of the plurality of cells is configured respectively based on the information for demodulation. 12. A radio communication system comprising:a radio base station apparatus having a processor that generates information for demodulation of a data signal in a mobile terminal apparatus in applying Coordinated Multi-Point (CoMP) transmission, and a transmitter that transmits the information for demodulation to the mobile terminal apparatus that performs Coordinated Multi-Point reception; and the mobile terminal apparatus having a receiver that receives the information for demodulation of a data signal, and a demodulator that demodulates the data signal subjected to Coordinated Multi-Point reception using the information for demodulation, wherein the transmitter includes information for demodulation in downlink control information (DCI) and transmits the DCI on PDCCH, wherein the information for demodulation includes information on a frequency shift of a cell-specific reference signal (CRS) of each cell and information on a multiplexing starting position of a physical downlink shared channel (PDSCH) signal of the cell, and wherein the information for demodulation corresponds to one or more PDCCH symbol lengths and the PDCCH symbol length for each cell of the plurality of cells is configured respectively based on the information for demodulation.
意見反饋