# US 9,520,970 B2 · Method and device for inter cell interference coordination in wireless communication system

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- Number: US 9,520,970 B2
- Document ID: US9520970B2
- Status: Granted
- Kind: B2
- Application number: 14/353,476
- Filed: 2012-10-26
- Published: 2014-10-09
- Granted: 2016-12-13
- Earliest claimed: 2011-10-26
- Assignees: LG Electronics Inc.
- Applicants: LG Electronics Inc.
- Inventors: Eunsun Kim; Hanbyul Seo; Kijun Kim
- Web page: https://patentgrep.com/patent/US9520970B2

## CPC

- H04L 5/0032: {Distributed allocation, i.e. involving a plurality of allocating devices, each making partial allocation}
- H04J 11/005: {of intercell interference}
- H04J 11/0053: {using co-ordinated multipoint transmission/reception (co-ordinated antenna or beam-forming aspects H04B7/022)}
- H04L 5/0035: {Resource allocation in a cooperative multipoint environment}
- H04L 5/0053: {Allocation of signalling, i.e. of overhead other than pilot signals}
- H04L 5/0073: {Allocation arrangements that take into account other cell interferences}
- H04W 24/08: Testing, {supervising or monitoring} using real traffic
- H04W 24/10: Scheduling measurement reports {; Arrangements for measurement reports}
- H04W 52/243: {taking into account interferences}
- H04W 52/32: TPC of broadcast or control channels
- H04W 52/40: during macro-diversity or soft handoff
- H04W 72/23: in the downlink direction of a wireless link, i.e. towards a terminal
- H04W 72/27: between access points
- H04W 52/367: {Power values between minimum and maximum limits, e.g. dynamic range}
- H04W 52/38: TPC being performed in particular situations
- H04W 72/0446: Resources in time domain, e.g. slots or frames
- Y02D 30/70: in wireless communication networks
- H04L: TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION (arrangements common to telegraphic and telephonic communication H04M)
- H04J: MULTIPLEX COMMUNICATION (transmission in general H04B; peculiar to transmission of digital information H04L5/00; systems for the simultaneous or sequential transmission of more than one television signal H04N7/08; in exchanges H04Q11/00; stereophonic systems H04S)
- H04W: WIRELESS COMMUNICATION NETWORKS (broadcast communication H04H; communication systems using wireless links for non-selective communication, e.g. wireless extensions H04M1/72)
- Y02D: CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE

## Abstract

A method in which a second cell receives subframe pattern information on a first cell according to one embodiment of the present application comprises a step in which uplink almost blank subframe (ABS) pattern information and downlink ABS pattern information on the first cell are received by a second cell, wherein the downlink ABS pattern information is not separated into first and second type ABSs set by the first cell, and the first and second type ABS patterns of the first cell can be identified on the basis of the downlink ABS pattern information and the uplink ABS pattern information.

## Claims

### Claim 1

A method for receiving, by a second cell, subframe pattern information on a first cell, the method comprising:
receiving, from the first cell, downlink almost blank subframe (ABS) pattern information for the first cell;
receiving, from the first cell, uplink ABS pattern information of the first cell,
wherein the downlink ABS pattern information does not explicitly indicate whether an ABS in a downlink ABS pattern corresponds to a zero power-ABS (z-ABS) or a reduced power-ABS (r-ABS), and
wherein whether the ABS in the downlink ABS pattern corresponds to the z-ABS or the r-ABS is implicitly indicated by a combination of the downlink ABS pattern information and the uplink ABS pattern information.

### Claim 2 (depends on 1)

The method according to claim 1, wherein a subframe n is identified as the z-ABS when the subframe n is indicated as an ABS in the downlink ABS pattern information and a subframe n+k is indicated as an uplink ABS in the uplink ABS pattern information, and the subframe n is identified as the r-ABS when the subframe n is indicated as an ABS in the downlink ABS pattern information and the subframe n+k is not indicated as an uplink ABS in the uplink ABS pattern information.

### Claim 3 (depends on 2)

The method according to claim 2, wherein k=4.

### Claim 4 (depends on 1)

The method according to claim 1, wherein ABS status information on the uplink ABS is fed back from the second cell to the first cell.

### Claim 5

A method for receiving, by a second cell, subframe pattern information on a first cell, the method comprising:
receiving, from the first cell, downlink almost blank subframe (ABS) pattern information of the first cell;
receiving, from the first cell, Tx power information of a downlink ABS,
wherein the downlink ABS pattern information explicitly indicates whether an ABS in a downlink ABS pattern corresponds to a zero power-ABS (z-ABS) or a reduced power-ABS (r-ABS), and
wherein an uplink ABS pattern on the first cell is implicitly indicated based on whether the ABS in the downlink ABS pattern corresponds to the z-ABS or the r-ABS.

### Claim 6 (depends on 5)

The method according to claim 5, wherein a subframe n+k is identified as an uplink ABS when a subframe n corresponds to the z-ABS, and the subframe n+k is identified as an uplink normal subframe when the subframe n corresponds to the r-ABS.

### Claim 7 (depends on 6)

The method according to claim 6, wherein k=4.

### Claim 8 (depends on 5)

The method according to claim 5, wherein a frequency domain inter-cell interference coordination (ICIC) message is transmitted by the first cell to the second cell.

### Claim 9 (depends on 8)

The method according to claim 8, wherein it is determined that the frequency domain ICIC message with respect to the subframe n+k is not valid when the subframe n corresponds to the z-ABS, and it is determined that the frequency domain ICIC message with respect to the subframe n+k is valid when the subframe n corresponds to the r-ABS.

### Claim 10 (depends on 9)

The method according to claim 9, wherein k=4.

### Claim 11 (depends on 8)

The method according to claim 8, wherein the frequency domain ICIC message includes at least one of interference overload indication (IOI) and high interference indication (HII).

### Claim 12

An eNB of a second cell for receiving subframe pattern information on a first cell, the eNB comprising:
a receiver configured to receive a signal from the first cell; and
a processor for controlling the eNB,
wherein the processor is configured to:
receive, from the first cell, downlink almost blank subframe (ABS) pattern information of the first cell, and
receive, from the first cell, uplink ABS pattern information of the first cell,
wherein the downlink ABS pattern information does not explicitly indicate whether an ABS in a downlink ABS pattern corresponds to a zero power-ABS (z-ABS) or a reduced power-ABS (r-ABS), and
wherein whether the ABS in the downlink ABS pattern corresponds to the z-ABS or r-ABS is implicitly indicated by a combination of the downlink ABS pattern information and the uplink ABS pattern information.

### Claim 13

An eNB of a second cell for receiving subframe pattern information on a first cell, the eNB comprising:
a receiver configured to receive a signal from the first cell; and
a processor for controlling the eNB,
wherein the processor is configured to:
receive, from the first cell, downlink almost blank subframe (ABS) pattern information of the first cell, and
receive, from the first cell, Tx power information on a downlink ABS of the first cell,
wherein the downlink ABS pattern information explicitly indicates whether an ABS in a downlink ABS pattern corresponds to a zero power-ABS (z-ABS) or a reduced power-ABS (r-ABS), and
wherein an uplink ABS pattern on the first cell is implicitly indicated based on whether the ABS in the downlink ABS pattern corresponds to the z-ABS or the r-ABS.