Method for determining validity signal in wireless communication system supporting usage change of radio resource, and apparatus therefor

Patent metadata

Field	Value
Publication number	US-10097335-B2
Application number	US-201515122803-A
Country	US
Kind code	B2
Filing date	Mar 10, 2015
Priority date	Mar 10, 2014
Publication date	Oct 9, 2018
Grant date	Oct 9, 2018

Abstract

The present invention relates to a method and an apparatus for receiving, in a wireless communication system supporting carrier aggregation and usage change of a radio resource, a signal of a terminal which does not support simultaneous reception and transmission of aggregated cells. Specifically, the method comprises the steps of: receiving downlink control information for a secondary cell on a specific radio resource corresponding to a special subframe of a primary cell and a downlink subframe of the secondary cell; and determining validity of the downlink control information according to an uplink-downlink setting of the primary cell, wherein the downlink control information is determined to be invalid if the primary cell is in non-fallback mode, and determined to be valid if the primary cell is a time division duplex (TDD) uplink-downlink setting according to fallback mode and the secondary cell is cross-carrier scheduled according to the primary cell.

First claim

The invention claimed is:

1. A method for receiving a signal by a user equipment (UE) configured to support simultaneous reception and trans mission of aggregated cells in a wireless communication system supporting carrier aggregation and reconfiguration of a radio resource, the method comprising:
receiving, on a radio resource, in which a special subframe of a primary cell, based on a first uplink-downlink configuration, overlaps a downlink subframe of a secondary cell, downlink control information about the secondary cell, wherein the special subframe includes a Downlink Pilot Time Slot (DwPTS), Guard Period (GP) and Uplink Pilot Time Slot (UpPTS);
monitoring a reconfiguration message for configuring a second uplink-downlink configuration of the primary cell; and
determining whether the downlink control information is valid based on the first and the second uplink-downlink configuration of the primary cell,
wherein, when the radio resource is a subframe identified as a downlink subframe by the second uplink-downlink configuration and as a special subframe by the first uplink-downlink configuration, the downlink control information is determined to be valid, and
wherein the first uplink-downlink configuration is configured by a system information block (SIB) and the second uplink-downlink configuration is configured by a reconfiguration message.

2. The method according to claim 1 , further comprising:
receiving, when the downlink control information is determined to be valid, a physical downlink shared channel (PDSCH) on the radio resource.

3. The method according to claim 1 , wherein validation is performed only when a special subframe configuration of the first uplink-downlink configuration is a plurality of configurations for the special subframe.

4. The method according to claim 1 , further comprising:
transmitting, when the downlink control information is valid, a Physical Uplink Shared Channel (PUSCH) on the uplink subframe indicated by an uplink grant included in the downlink control information.

5. A user equipment (UE) configured not to support simultaneous reception and transmission of aggregated cells in a wireless communication system supporting carrier aggregation and reconfiguration of a radio resource, the UE comprising:
a transmitter and a receiver; and
a processor, operatively coupled to the transmitter and receiver, that:
controls the receiver to receive, on a radio resource, in which a special subframe of a primary cell, based on a first uplink-downlink configuration, overlaps a downlink subframe of a secondary cell, downlink control information about the secondary cell, wherein the special subframe includes a Downlink Pilot Time Slot (DwPTS), Guard Period (GP) and Uplink Pilot Time Slot (UpPTS);
monitors a reconfiguration message for configuring a second uplink-downlink configuration of the primary cell; and
determines whether the downlink control information is valid based on the first and the second uplink-downlink configuration of the primary cell,
wherein, when the radio resource is a subframe identified as a downlink subframe by the second uplink-downlink configuration and as a special subframe by the first uplink-downlink configuration, the downlink control information is determined to be valid, and
wherein the first uplink-downlink configuration is configured by a system information block (SIB) and the second uplink-downlink configuration is configured by a reconfiguration message.

6. A method for transmitting a signal by a user equipment (UE) configured not to support simultaneous reception and transmission of aggregated cells in a wireless communication system supporting carrier aggregation and reconfiguration of a radio resource, the method comprising:
receiving a sounding reference signal (SRS) triggering message for a secondary cell on a radio resource, in which a special subframe of a primary cell based on a first uplink-downlink configuration, overlaps a downlink subframe of the secondary cell, wherein the special subframe includes a Downlink Pilot Time Slot (DwPTS), Guard Period (GP) and Uplink Pilot Time Slot (UpPTS);
monitoring a reconfiguration message for configuring a second uplink-downlink configuration of the primary cell; and
determining whether the SRS triggering message is valid based on the first and the second uplink-downlink configuration of the primary cell,
wherein, when the radio resource is a subframe identified as a downlink subframe by the second uplink-downlink configuration and as a special subframe by the first uplink-downlink configuration, the SRS triggering message is determined to be valid, and
wherein the first uplink-downlink configuration is configured by a system information block (SIB) and the second uplink-downlink configuration is configured by a reconfiguration message.

7. The method according to claim 6 , wherein the SRS triggering message is determined to be valid when a Physical Uplink Shared Channel (PUSCH) and the SRS are scheduled simultaneously on the radio resource.

Assignees

• Lg Electronics Inc

Inventors

• Lee Seungmin
• Ahn Joonkui
• Yang Suckchel

Classifications

• H04W72/23

  in the downlink direction of a wireless link, i.e. towards a terminal · CPC title

• H04L1/1861

  Physical mapping arrangements (for ACK signaling see also H04L5/0053) · CPC title

• H04W72/1268

  of uplink data flows · CPC title

• H04L5/14 Primary

  Two-way operation using the same type of signal, i.e. duplex · CPC title

• H04W72/0453

  Resources in frequency domain, e.g. a carrier in FDMA · CPC title