RADIO COMMUNICATION SYSTEM, BASE STATION APPARATUS AND RADIO COMMUNICATION METHOD

• US 20150029982A1
• Filed: 03/18/2013
• Published: 01/29/2015
• Est. Priority Date: 03/30/2012
• Status: Active Grant

• Current Assignee: NTT Docomo Incorporated (Nippon Telegraph and Telephone Corporation)
• Original Assignee: NTT Docomo Incorporated (Nippon Telegraph and Telephone Corporation)
• Inventors: Nagata, Satoshi, Takeda, Kazuaki, Takahashi, Hideaki, Kishiyama, Yoshihisa
• Granted Patent: US 9,769,809 B2
• Time in Patent Office: Days
• US Class Current: 370/329
• CPC Class Codes: H04J 11/0023 Interference mitigation or co-ordination direct sequence spread spectrum [DSSS] systems H04B1/7097; frequency hopping H04B1/713; allocation criteria for ingress interference avoidance H04L5/0062; frequency allocation criteria for requirements on out-of-channel emissions H04L5/0066; arrangements for removing intersymbol interference or baseband equalisers H04L25/03006; peak power aspects in multicarrier modulation H04L27/2614; power management H04W52/00; traffic scheduling H04W72/54, H04W72/541
• CPC Class Codes: H04W 28/18 Negotiating wireless communication parameters
• CPC Class Codes: H04W 48/00 Access restriction access security to prevent unauthorised access H04W12/08; Network selection; Access point selection
• CPC Class Codes: H04W 72/23 in the downlink direction of a wireless link, i.e. towards a terminal
• CPC Class Codes: H04W 76/27 Transitions between radio resource control [RRC] states
• CPC Class Codes: H04W 88/08 Access point devices

Abstract

The present invention is designed to report parameters related to techniques provided for in the LTE-A system to a user terminal with adequate timing. The radio communication method of the present invention provides a radio communication method in a radio communication system having a base station apparatus that is configured in compliance with LTE-Advanced system standards, and a user terminal that is configured to be able to perform radio communication with the base station apparatus, and, in this radio communication method, the base station apparatus generates downlink control channel information related to an enhanced physical downlink control channel, and notifies the downlink control channel information to the user terminal using an RRC Connection Reconfiguration signal, and the user terminal receives the RRC Connection Reconfiguration signal, and sets up the downlink control channel information.

Claims

1. A radio communication system comprising a base station apparatus that is configured in compliance with an LTE-Advanced system standard, and a user terminal that is configured to be able to perform radio communication with the base station apparatus, wherein:

the base station apparatus comprises;

a generating section that generates downlink control channel information related to an enhanced physical downlink control channel; and

a notifying section that notifies the downlink control channel information to the user terminal using an RRC Connection Reconfiguration signal; and

the user terminal comprises;

a receiving section that receives the RRC Connection Reconfiguration signal; and

a setting section that sets up the downlink control channel information.

2. The radio communication system according to claim 1, wherein the downlink control channel information comprises information about a transmission method of an enhanced physical downlink control channel signal, information about a multiplexing position, information about a transmission mode, or information about an antenna port of a reference signal to demodulate the enhanced physical downlink control channel signal.

3. A radio communication system comprising a base station apparatus that is configured in compliance with an LTE-Advanced system standard, and a user terminal that is configured to be able to perform radio communication with the base station apparatus, wherein:

the base station apparatus comprises;

a generating section that generates cell-specific reference signal information related to a cell-specific reference signal; and

a notifying section that notifies the cell-specific reference signal information to the user terminal using an RRC Connection Reconfiguration signal; and

the user terminal comprises;

a receiving section that receives the RRC Connection Reconfiguration signal; and

a setting section that sets up the cell-specific reference signal information.

4. The radio communication system according to claim 3, wherein the cell-specific reference signal information comprises information about a multiplexing position of the cell-specific reference signal, information about the number of antenna ports of a cell-specific reference signal of a neighboring cell, or information as to whether or not a cell-specific reference signal is present in a subframe.

5. A radio communication system comprising a base station apparatus that is configured in compliance with an LTE-Advanced system standard, and a user terminal that is configured to be able to perform radio communication with the base station apparatus, wherein:

the base station apparatus comprises;

a generating section that generates sequence information related to an initial pseudo-random sequence of a downlink reference signal; and

a notifying section that notifies the sequence information to the user terminal using an RRC Connection Reconfiguration signal; and

the user terminal comprises;

a receiving section that receives the RRC Connection Reconfiguration signal; and

a setting section that sets up the sequence information.

6. The radio communication system according to claim 5, wherein the sequence information comprises information about an initial pseudo-random sequence of a DM-RS (Demodulation-Reference Signal) or a CSI-RS (Channel State Information-Reference Signal).

7. A radio communication system comprising a base station apparatus that is configured in compliance with an LTE-Advanced system standard, and a user terminal that is configured to be able to perform radio communication with the base station apparatus, wherein:

the base station apparatus comprises;

a generating section that generates uplink reference signal information related to an uplink DM-RS (Demodulation-Reference Signal);

a notifying section that notifies the uplink reference signal information to the user terminal using an RRC Connection Reconfiguration signal; and

the user terminal comprises;

a receiving section that receives the RRC Connection Reconfiguration signal; and

a setting section that sets up the uplink reference signal information.

8. The radio communication system according to claim 7, wherein the uplink reference signal information comprises information about a base sequence, information about the amount of offset from a physical uplink control channel sequence, or information about the amount of cyclic shift hopping.

9. A radio communication system comprising a base station apparatus that is configured in compliance with an LTE-Advanced system standard, and a user terminal that is configured to be able to perform radio communication with the base station apparatus, wherein:

the base station apparatus comprises;

a generating section that generates radio resource information related to a radio resource for interference estimation to use in channel quality measurement in the user terminal;

a notifying section that notifies the radio resource information to the user terminal using an RRC Connection Reconfiguration signal; and

the user terminal comprises;

a receiving section that receives the RRC Connection Reconfiguration signal; and

a setting section that sets up the radio resource information.

10. A base station apparatus in a radio communication system comprising the base station apparatus that is configured in compliance with an LTE-Advanced system standard, and a user terminal that is configured to be able to perform radio communication with the base station apparatus, the base station apparatus comprising:

a generating section that generates downlink control channel information related to an enhanced physical downlink control channel; and

a notifying section that notifies the downlink control channel information to the user terminal using an RRC Connection Reconfiguration signal.

11. A base station apparatus in a radio communication system comprising the base station apparatus that is configured in compliance with an LTE-Advanced system standard, and a user terminal that is configured to be able to perform radio communication with the base station apparatus, the base station apparatus comprising:

a generating section that generates cell-specific reference signal information related to a cell-specific reference signal; and

a notifying section that notifies the cell-specific reference signal information to the user terminal using an RRC Connection Reconfiguration signal.

12. A base station apparatus in a radio communication system comprising the base station apparatus that is configured in compliance with an LTE-Advanced system standard, and a user terminal that is configured to be able to perform radio communication with the base station apparatus, the base station apparatus comprising:

a generating section that generates sequence information related to an initial pseudo-random sequence of a downlink reference signal; and

a notifying section that notifies the sequence information to the user terminal using an RRC Connection Reconfiguration signal.

13. A base station apparatus in a radio communication system comprising the base station apparatus that is configured in compliance with an LTE-Advanced system standard, and a user terminal that is configured to be able to perform radio communication with the base station apparatus, the base station apparatus comprising:

a generating section that generates uplink reference signal information related to an uplink DM-RS (Demodulation-Reference Signal); and

a notifying section that notifies the uplink reference signal information to the user terminal using an RRC Connection Reconfiguration signal.

14. A base station apparatus in a radio communication system comprising the base station apparatus that is configured in compliance with an LTE-Advanced system standard, and a user terminal that is configured to be able to perform radio communication with the base station apparatus, the base station apparatus comprising:

a generating section that generates radio resource information related to a radio resource for interference estimation to use in channel quality measurement in the user terminal; and

a notifying section that notifies the radio resource information to the user terminal using an RRC Connection Reconfiguration signal.

15. A radio communication method in a radio communication system comprising a base station apparatus that is configured in compliance with an LTE-Advanced system standard, and a user terminal that is configured to be able to perform radio communication with the base station apparatus, the radio communication method comprising the steps of:

at the base station apparatus;

generating downlink control channel information related to an enhanced physical downlink control channel; and

notifying the downlink control channel information to the user terminal using an RRC Connection Reconfiguration signal; and

at the user terminal;

receiving the RRC Connection Reconfiguration signal; and

setting up the downlink control channel information.

16. A radio communication method in a radio communication system comprising a base station apparatus that is configured in compliance with an LTE-Advanced system standard, and a user terminal that is configured to be able to perform radio communication with the base station apparatus, the radio communication method comprising the steps of:

at the base station apparatus;

generating cell-specific reference signal information related to a cell-specific reference signal; and

notifying the cell-specific reference signal information to the user terminal using an RRC Connection Reconfiguration signal; and

at the user terminal;

receiving the RRC Connection Reconfiguration signal; and

setting up the cell-specific reference signal information.

17. A radio communication method in a radio communication system comprising a base station apparatus that is configured in compliance with an LTE-Advanced system standard, and a user terminal that is configured to be able to perform radio communication with the base station apparatus, the radio communication method comprising the steps of:

at the base station apparatus;

generating sequence information related to an initial pseudo-random sequence of a downlink reference signal; and

notifying the sequence information to the user terminal using an RRC Connection Reconfiguration signal; and

at the user terminal;

receiving the RRC Connection Reconfiguration signal; and

setting up the sequence information.

18. A radio communication method in a radio communication system comprising a base station apparatus that is configured in compliance with an LTE-Advanced system standard, and a user terminal that is configured to be able to perform radio communication with the base station apparatus, the radio communication method comprising the steps of:

at the base station apparatus;

generating uplink reference signal information related to an uplink DM-RS (Demodulation-Reference Signal);

notifying the uplink reference signal information to the user terminal using an RRC Connection Reconfiguration signal; and

at the user terminal;

receiving the RRC Connection Reconfiguration signal; and

setting up the uplink reference signal information.

19. A radio communication method in a radio communication system comprising a base station apparatus that is configured in compliance with an LTE-Advanced system standard, and a user terminal that is configured to be able to perform radio communication with the base station apparatus, the radio communication method comprising the steps of:

at the base station apparatus;

generating radio resource information related to a radio resource for interference estimation to use in channel quality measurement in the user terminal;

notifying the radio resource information to the user terminal using an RRC Connection Reconfiguration signal; and

at the user terminal;

receiving the RRC Connection Reconfiguration signal; and

setting up the radio resource information.