Method and device for measuring a reference signal received quality in wireless communication system

• US 9,635,577 B2
• Filed: 12/12/2012
• Issued: 04/25/2017
• Est. Priority Date: 12/12/2011
• Status: Active Grant

• Current Assignee: LG Electronics, Inc. (LG Corporation)
• Original Assignee: LG Electronics, Inc. (LG Corporation)
• Inventors: Seo, Inkwon, Seo, Hanbyul
• Primary Examiner(s): Moore, Ian N.
• Assistant Examiner(s): Ambaye, Mewale
• Application Number:
  US14/364,613
• Publication Number:
  US 20140348015A1
• Time in Patent Office: 1,595 Days
• CPC Class Codes: H04B 7/26 at least one of which is mobile
• CPC Class Codes: H04J 11/005 of intercell interference
• CPC Class Codes: H04J 2211/001 using small cells within macro cells, e.g. femto, pico or microcells
• CPC Class Codes: H04W 24/08 Testing, supervising or monitoring using real traffic
• CPC Class Codes: H04W 24/10 Scheduling measurement reports ; Arrangements for measurement reports
• CPC Class Codes: H04W 48/16 Discovering, processing access restriction or access information
• CPC Class Codes: H04W 52/244 Interferences in heterogeneous networks, e.g. among macro and femto or pico cells or other sector / system interference [OSI]
• CPC Class Codes: H04W 72/542 using measured or perceived quality

Abstract

A method for measuring by a terminal at least one or more transmission points among a first transmission point and a second transmission point, which are neighboring cells, in a wireless communication system. The method includes: measuring a reference signal strength indicator (RSSI) in a predetermined resource of a subframe; and measuring reference signal received quality (RSRQ) from the RSSI and reference signal received power (RSRP), where the predetermined resource is associated with the setting of an almost blank subframe (ABS) of the first transmission point for the subframe.

Claims

1. A method for measuring at least one of first and second transmission points (TPs) of a neighbor cell by a user equipment (UE) including a processor and a receiver, the UE belonging to a third TP of a serving cell in a wireless communication system, the method comprising:

receiving, by the UE, an almost blank subframe (ABS) pattern of the first TP from the third TP;

determining, by the UE, whether to use all orthogonal frequency division multiplexing (OFDM) symbols contained in a subframe or to use OFDM symbols, used for transmitting a reference signal (RS) of the first TP, among the OFDM symbols in the subframe for measuring Reference Signal Strength Indicator (RSSI) according to whether the subframe is corresponding to the ABS or a normal subframe based on the ABS pattern of the first TP;

measuring, by the UE, the RSSI in the determined OFDM symbols of the subframe;

measuring, by the UE, a Reference Signal Received Quality (RSRQ) based on the RSSI;

transmitting a measurement report including the RSRQ to the third TP; and

receiving at least one measurement subframe pattern and measurement resource information corresponding to the at least one measurement subframe pattern from a third TP of a cell including the user equipment (UE),

wherein the subframe is contained in any one of the at least one measurement subframe pattern, and the OFDM symbols are indicated by measurement resource information corresponding to the measurement subframe pattern including the subframe, and

wherein the at least one measurement subframe pattern and the measurement resource information corresponding to the at least one measurement subframe pattern are decided by the third TP that has received an ABS pattern of the first TP from the first TP, on the basis of the ABS pattern of the first TP.

2. The method according to claim 1, wherein:

if the subframe corresponds to the ABS subframe, all OFDM symbols contained in the subframe are used for measuring RSSI, and the RSSI relates to the second TP.

3. The method according to claim 1, wherein:

if the subframe corresponds to the normal subframe, all OFDM contained in the subframe are used for measuring RSSI, and the RSSI relates to the first TP.

4. The method according to claim 1, wherein:

if the predetermined resource is on the normal subframe, all OFDM symbols through which a cell-specific RS of the first TP is transmitted, are used for measuring RSSI and the RSSI relates to the first TP.

5. The method according to claim 1, wherein:

if the predetermined resource is on the normal subframe, all OFDM symbols, related to an antenna port through which the RS of the first TP is transmitted, are used for measuring RSSI and the RSSI relates to the first TP.

6. The method according to claim 1, wherein the RS is one of a cell-specific RS, a demodulation reference signal (DMRS), or a channel status information reference signal (CSI-RS).

7. The method according to claim 1, wherein the ABS pattern of the first TP is at least one of the ABS pattern of the first TP and a normal subframe pattern.

8. The method according to claim 1, wherein the at least one measurement subframe pattern and the measurement resource information corresponding to the at least measurement subframe pattern are contained in a neighbor cell list.

9. The method according to claim 8, wherein the neighbor cell list serving as system information is broadcast from the third TP.

10. The method according to claim 1, wherein the first TP is a macro eNB (MeNB), and the second TP is a pico eNB (PeNB).

11. A user equipment (UE) configured to measure at least one of first and second transmission points (TPs) of a neighbor cell in a wireless communication system, the UE belonging to a third TP of a serving cell, the UE comprising:

a receiver;

a processor connected to the receiver and configured to;

receive an almost blank subframe (ABS) pattern of the first TP from the third TP;

determine whether to use all orthogonal frequency division multiplexing (OFDM) symbols contained in a subframe or to use OFDM symbols, used for transmitting a reference signal (RS) of the first TP, among the OFDM symbols in the subframe for measuring Reference Signal Strength Indicator (RSSI) according to whether the subframe is corresponding to the ABS or a normal subframe based on the ABS pattern of the first TP;

measure the RSSI in the determined OFDM symbols of the subframe;

measure a Reference Signal Received Quality (RSRQ) based on the RSSI,

transmit a measurement report including the RSRQ to the third TP, and

receive at least one measurement subframe pattern and measurement resource information corresponding to the at least one measurement subframe pattern from a third TP of a cell including the user equipment (UE),

wherein the subframe is contained in any one of the at least one measurement subframe pattern, and the OFDM symbols are indicated by measurement resource information corresponding to the measurement subframe pattern including the subframe, and

wherein the at least one measurement subframe pattern and the measurement resource information corresponding to the at least one measurement subframe pattern are decided by the third TP that has received an ABS pattern of the first TP from the first TP, on the basis of the ABS pattern of the first TP.