RADIO BASE STATION, USER TERMINAL AND RADIO COMMUNICATION METHOD

• US 20130301445A1
• Filed: 11/10/2011
• Published: 11/14/2013
• Est. Priority Date: 11/15/2010
• Status: Abandoned Application

• Current Assignee: NTT Docomo Incorporated (Nippon Telegraph and Telephone Corporation)
• Original Assignee: NTT Docomo Incorporated (Nippon Telegraph and Telephone Corporation)
• Inventors: Abe, Tetsushi, Iwamura, Mikio, Takahashi, Hideaki, Miki, Nobuniko
• Application Number:
  US13/885,238
• Publication Number:
  US 20130301445A1
• Time in Patent Office: Days
• US Class Current: 370/252
• CPC Class Codes: H04L 5/0007 the frequencies being orthogonal, e.g. OFDM(A), DMT
• CPC Class Codes: H04L 5/0053 Allocation of signaling, i.e. of overhead other than pilot signals
• CPC Class Codes: H04L 5/0057 Physical resource allocation for CQI
• CPC Class Codes: H04L 5/006 Quality of the received signal, e.g. BER, SNR, water filling
• CPC Class Codes: H04L 5/0073 Allocation arrangements that take into account other cell interferences for intercell interference mitigation or co-ordination in orthogonal multiplex systems H04J11/005
• CPC Class Codes: H04W 24/10 Scheduling measurement reports ; Arrangements for measurement reports
• CPC Class Codes: H04W 84/045 using private Base Stations, e.g. femto Base Stations, home Node B

Abstract

Provided are a radio base station, a user terminal and a radio communication method capable of making accurate measurement in various network configurations in HetNet. The radio communication method according to the present invention has, in a heterogeneous network having a network configuration where a macro cell overlays a micro cell that is smaller than the macro cell, a radio base station that forms the macro cell and is connected to a macro terminal under control of the macro cell determining a measurement subframe to measure a CRS based on the network configuration, generating a time reference indicating the measurement subframe and transmitting a signal including the time reference and the CRS to the macro terminal; and the macro terminal receiving the time reference and the CRS and measuring the CRS in the measurement subframe indicated by the time reference.

Claims

1. A radio base station in a heterogeneous network having a network configuration where a macro cell overlays a micro cell that is smaller than the macro cell, the radio base station comprising:

a subframe determining section configured to generate a measurement subframe pattern to measure a channel state and a time reference indicating a pattern start timing of the measurement subframe pattern based on the network configuration; and

a transmitting section configured to transmit a signal including the measurement subframe pattern and the time reference to a user terminal.

2. The radio base station of claim 1, wherein the time reference indicates to match the pattern start timing with a radio frame timing of the radio base station having transmitted the measurement subframe pattern.

3. The radio base station of claim 1, wherein the time reference indicates to match the pattern start timing with a radio frame timing of a cell as a measurement target.

4. The radio base station of claim 3, wherein the micro cell is an OSG cell.

5. The radio base station of claim 2, wherein the micro cell is an CSG cell.

6. A user terminal in a heterogeneous network having a network configuration where a macro cell overlays a micro cell that is smaller than the macro cell, the user terminal comprising:

a receiving section configured to receive a measurement subframe pattern to measure a channel state; and

a measuring section configured to measure the channel state in accordance with the measurement subframe pattern and a time reference indicating a pattern start timing.

7. The user terminal of claim 6, wherein the time reference is transmitted from a radio base station.

8. The user terminal of claim 6, wherein the time reference is determined in advance.

9. The user terminal of claim 6, wherein the time reference indicates to match the pattern start timing with a radio frame timing of a radio base station having transmitted the measurement subframe pattern.

10. The user terminal of claim 6, wherein the time reference indicates to match the pattern start timing with a radio frame timing of a cell as a measurement target.

13. The user terminal of claim 7, wherein the time reference indicates to match the pattern start timing with a radio frame timing of a radio base station having transmitted the measurement subframe pattern.

14. The user terminal of claim 7, wherein the time reference indicates to match the pattern start timing with a radio frame timing of a cell as a measurement target.

15. The user terminal of claim 8, wherein the time reference indicates to match the pattern start timing with a radio frame timing of a radio base station having transmitted the measurement subframe pattern.

16. The user terminal of claim 8, wherein the time reference indicates to match the pattern start timing with a radio frame timing of a cell as a measurement target.

11. A radio communication method comprising the steps of:

a radio base station in a heterogeneous network having a network configuration where a macro cell overlays a micro cell that is smaller than the macro cell,

generating a measurement subframe pattern to measure a channel state and a time reference indicating a pattern start timing of the measurement subframe pattern based on the network configuration; and

transmitting a signal including the measurement subframe pattern and the time reference to a user terminal; and

the user terminal

receiving the signal including the measurement subframe pattern and the time reference; and

measuring the channel state based on the measurement subframe pattern and the time reference.

12. A radio communication method comprising the steps of:

a radio base station in a heterogeneous network having a network configuration where a macro cell overlays a micro cell that is smaller than the macro cell, the radio base station;

generating a measurement subframe pattern to measure a channel state based on the network configuration, and

transmitting a signal including the measurement subframe pattern to a user terminal; and

the user terminal;

receiving the signal including the measurement subframe pattern, and

measuring the channel state based on the measurement subframe pattern and a time reference indicating a pattern start timing of the measurement subframe pattern.