METHOD AND DEVICE FOR MEASURING CHANNEL BETWEEN BASE STATIONS IN WIRELESS COMMUNICATION SYSTEM

• US 20150350945A1
• Filed: 01/23/2014
• Published: 12/03/2015
• Est. Priority Date: 01/25/2013
• Status: Abandoned Application

• Current Assignee: LG Electronics, Inc. (LG Corporation)
• Original Assignee: LG Electronics, Inc. (LG Corporation)
• Inventors: CHAE, Hyukjin, SEO, Hanbyul, LEE, Seungmin
• Application Number:
  US14/759,577
• Publication Number:
  US 20150350945A1
• Time in Patent Office: Days
• US Class Current: 1/1
• CPC Class Codes: H04B 17/00 Monitoring; Testing of line transmission systems H04B3/46; arrangements for monitoring or testing transmission systems employing electromagnetic waves other than radio waves H04B10/07
• CPC Class Codes: H04B 17/345 Interference values signal-to-interference ratio [SIR] or carrier-to-interference ratio [CIR] H04B17/336
• CPC Class Codes: H04J 11/0056 Inter-base station aspects
• CPC Class Codes: H04L 25/0204 of multiple channels
• CPC Class Codes: H04L 25/0224 using sounding signals
• CPC Class Codes: H04L 27/2602 Signal structure
• CPC Class Codes: H04L 27/2607 Cyclic extensions
• CPC Class Codes: H04L 5/0048 Allocation of pilot signals, i.e. of signals known to the receiver
• CPC Class Codes: H04L 5/0057 Physical resource allocation for CQI
• 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: H04L 5/1469 using time-sharing
• CPC Class Codes: H04W 24/10 Scheduling measurement reports ; Arrangements for measurement reports
• CPC Class Codes: H04W 72/0446 Resources in time domain, e.g. slots or frames
• CPC Class Codes: H04W 72/20 Control channels or signalling for resource management
• CPC Class Codes: H04W 88/08 Access point devices

Abstract

One embodiment of the present invention relates to a method by which a first base station measures a channel with a second base station in a wireless communication system, the channel measuring method comprising the steps of: receiving a reference signal transmitted by the second base station, in a first subframe; and estimating a channel with the second base station on the basis of the reference signal, wherein the first subframe is obtained by changing a subframe indicated for an uplink by system information into a subframe for a downlink by the second base station.

Claims

1. A method for measuring a channel to a second base station by a first base station in a wireless communication system, the method comprising:

receiving, in a first subframe, a reference signal transmitted from the second base station; and

measuring the channel to the second base station based on the reference signal,

wherein the first subframe is a subframe indicated for uplink use by system information and switched to downlink use by the second base station.

2. The method according to claim 1, wherein, when the first base station and the second base station perform transmission and reception of a signal other than the reference signal with each user equipment in the first subframe, the reference signal is transmitted by applying timing advance.

3. The method according to claim 2, wherein the timing advance is delivered from the first base station.

4. The method according to claim 3, wherein the timing advance is delivered to user equipments belonging to the second base station though higher layer signaling.

5. The method according to claim 1, wherein, when the first base station receives a signal from a user equipment in the first subframe, and the second base station does not transmit a signal except the reference signal in the first subframe, the reference signal is related to an uplink reference signal.

6. The method according to claim 5, wherein the uplink reference signal comprises a sounding reference signal, a demodulation reference signal, and a random access-related signal.

7. The method according to claim 5, wherein the second base station signals, to user equipments belonging to the second base station, that only the reference signal is transmitted in the first subframe.

8. The method according to claim 1, wherein, when user equipments of the first base station do not transmit an uplink signal in the first subframe, and the second base station transmits a signal other than the reference signal to a user equipment in the first subframe, the reference signal is related to a downlink reference signal.

9. The method according to claim 8, wherein the downlink reference signal comprises a cell-specific reference signal, a channel state information reference signal, and a demodulation reference signal.

10. The method according to claim 1, wherein user equipments of the first base station do not transmit an uplink signal in the first subframe, and the second base station does not transmit a signal except the reference signal in the first subframe.

11. The method according to claim 10, wherein, when timing advance is not applied to transmission of the reference signal, the reference signal corresponds to a sequence related to a sounding reference signal and transmitted over at least one symbol.

12. The method according to claim 11, wherein the at least one symbol differ between base stations transmitting a reference signal.

13. The method according to claim 1, wherein a subframe immediately before the subframe is at least one of a subframe configured for uplink use and a special subframe.

14. The method according to claim 10, wherein an extended cyclic prefix (CP) is used for the first subframe.

15. A first base station for measuring a channel to a second base station in a wireless communication system, the first base station comprising:

a transmit module; and

a processor,

wherein the processor is configured to;

receive, in a first subframe, a reference signal transmitted from the second base station; and

measure the channel to the second base station based on the reference signal,

wherein the first subframe is a subframe indicated for uplink use by system information and switched to downlink use by the second base station.