METHOD AND APPARATUS FOR TRANSMITTING/RECEIVING UPLINK SIGNAL, AND METHOD AND APPARATUS FOR TRANSMITTING/RECEIVING DOWNLINK SIGNAL

• US 20140133430A1
• Filed: 06/28/2012
• Published: 05/15/2014
• Est. Priority Date: 06/28/2011
• Status: Active Grant

• Current Assignee: LG Electronics, Inc. (LG Corporation)
• Original Assignee: LG Electronics, Inc. (LG Corporation)
• Inventors: Yang, Suckchel, Kim, Mingyu, Ahn, Joonkui, Seo, Dongyoun
• Granted Patent: US 9,288,028 B2
• Time in Patent Office: Days
• US Class Current: 370/329
• CPC Class Codes: H04L 1/1854 Scheduling and prioritising arrangements
• CPC Class Codes: H04L 1/1864 ARQ related signaling H04L1/1607 takes precedence
• CPC Class Codes: H04L 1/1887 Scheduling and prioritising arrangements
• CPC Class Codes: H04L 5/0055 Physical resource allocation for ACK/NACK for physical mapping arrangements in ARQ protocols H04L1/1861
• CPC Class Codes: H04W 72/04 Wireless resource allocation
• CPC Class Codes: H04W 74/0833 Random access procedures, e.g. with 4-step access

Abstract

The present invention provides a method for scheduling an uplink and a method for scheduling a downlink for a user equipment group comprising a plurality of user equipments in similar channel situations. In the present invention, which relates to the method for scheduling the uplink, a primary user equipment for a user equipment group is configured, and information according to a random access procedure that is performed by the primary user equipment is shared by means of other user equipments in the user equipment group. In the present invention, which relates to the method for scheduling the downlink, each of the user equipment in the user equipment group attempt to detect downlink data by a random access preamble transmission timing, and transmits a pertinent random access preamble to a base station at the random access preamble transmission timing, thereby notifying the base station of a failure to receive the downlink data, when the detection of the downlink data by the random access preamble transmission timing fails.

Claims

1. A method for transmitting an uplink signal to a base station by a user equipment included in a user equipment group including a plurality of user equipments in a wireless communication system, the method comprising:

receiving a random access response to a random access preamble transmitted by a user equipment configured as a primary user equipment among the plurality of user equipments from the base station;

transmitting uplink data to the base station based on an uplink grant for the user equipment group, the uplink grant included in the random access response;

receiving downlink feedback information for the user equipment group from the base station; and

retransmitting the uplink data to the base station when acknowledgement/negative acknowledgement (ACK/NACK) information for the user equipment, included in the downlink feedback information, indicates NACK.

2. The method according to claim 1, wherein:

the uplink grant includes timing advance information for the user equipment group, and

the uplink data is transmitted or retransmitted to the base station based on the timing advance information.

3. The method according to claim 2, wherein:

the downlink feedback information includes ACK/NACK information for uplink data transmission of a user equipment belonging to the user equipment group.

4. A user equipment for transmitting an uplink signal to a base station in a wireless communication system, wherein the user equipment is included in a user equipment group including a plurality of user equipments, the user equipment comprising:

a radio frequency (RF) unit; and

a processor configured to the RF unit,

wherein the processor controls the RF unit to receive a random access response to a random access preamble transmitted by a user equipment configured as a primary user equipment among the plurality of user equipments from the base station, controls the RF unit to transmit uplink data to the base station based on an uplink grant for the user equipment group, the uplink grant included in the random access response, controls the RF unit to receive downlink feedback information for the user equipment group from the base station, and controls the RF unit to retransmit the uplink data to the base station when acknowledgement/negative acknowledgement (ACK/NACK) information for the user equipment, included in the downlink feedback information, indicates NACK.

5. The user equipment according to claim 4, wherein:

the uplink grant includes timing advance information for the user equipment group, and

the processor controls the RF unit to transmit or retransmit the uplink data to the base station based on the timing advance information.

6. The user equipment according to claim 5, wherein:

the downlink feedback information includes ACK/NACK information for uplink data transmission of a user equipment belonging to the user equipment group.

7. A method for receiving an uplink signal from a user equipment group including a plurality of user equipments by a base station in a wireless communication system, the method comprising:

receiving a random access preamble from a user equipment configured as a primary user equipment among the plurality of user equipments;

transmitting a random access response including an uplink grant for the user equipment group to the user equipment group in response to the random access preamble;

receiving uplink data from the plurality of user equipments based on the uplink grant for the user equipment group;

transmitting downlink feedback information for the user equipment group to the user equipment group; and

receiving uplink data retransmitted from a user equipment that has transmitted uplink data determined to be negative acknowledgement (NACK) among the plurality of user equipments in the user equipment group.

8. A base station for receiving an uplink signal from a user equipment group including a plurality of user equipments in a wireless communication system, the base station comprising:

a radio frequency (RF) unit; and

a processor configured to the RF unit,

wherein the processor controls the RF unit to receive a random access preamble from a user equipment configured as a primary user equipment among the plurality of user equipments, controls the RF unit to transmit a random access response including an uplink grant for the user equipment group to the user equipment group in response to the random access preamble, controls the RF unit to receive uplink data from the plurality of user equipments based on the uplink grant for the user equipment group, controls the RF unit to transmit downlink feedback information for the user equipment group to the user equipment group, and controls the RF unit to receive uplink data retransmitted from a user equipment that has transmitted uplink data determined to be negative acknowledgement (NACK), among the plurality of user equipments in the user equipment group.

9. (canceled)

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