# US 10,873,422 B2 · Method for executing HARQ in wireless communication system and device therefor

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- Number: US 10,873,422 B2
- Document ID: US10873422B2
- Status: Granted
- Kind: B2
- Application number: 16/079,652
- Filed: 2016-02-26
- Published: 2019-02-28
- Granted: 2020-12-22
- Earliest claimed: 2016-02-26
- Assignees: LG Electronics Inc.
- Applicants: LG Electronics Inc.
- Inventors: Eunjong Lee; Heejeong Cho; Genebeck Hahn; Ilmu Byun
- Web page: https://patentgrep.com/patent/US10873422B2

## CPC

- H04L 1/1819: {with retransmission of additional or different redundancy}
- H04L 1/18: Automatic repetition systems, e.g. Van Duuren systems
- H04L 1/1845: {Combining techniques, e.g. code combining}
- H04L 1/1861: {Physical mapping arrangements (for ACK signaling see also H04L5/0053)}
- H04L 1/1864: {ARQ related signaling (H04L1/1607 takes precedence)}
- H04L 1/1896: {ARQ related signaling}
- H04L 5/0035: {Resource allocation in a cooperative multipoint environment}
- H04L 5/0055: {Physical resource allocation for ACK/NACK (for physical mapping arrangements in ARQ protocols H04L1/1861)}
- H04W 76/27: Transitions between radio resource control [RRC] states
- H04L 5/0007: {the frequencies being orthogonal, e.g. OFDM(A) or DMT}
- H04W 74/0833: Random access procedures, e.g. with 4-step access
- H04L: TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION (arrangements common to telegraphic and telephonic communication H04M)
- H04W: WIRELESS COMMUNICATION NETWORKS (broadcast communication H04H; communication systems using wireless links for non-selective communication, e.g. wireless extensions H04M1/72)

## Abstract

In this specification, a method of performing a hybrid automatic request (HARQ) in a wireless communication system is performed by a user equipment, and includes receiving first data from a first eNB through a first radio link; receiving second data from at least one second eNB through a second radio link; combining the first data and the second data; decoding the combined data; and feedbacking the results of the decoding through at least one of the first radio link or the second radio link.

## Claims

### Claim 1

A method of performing, by a user equipment (UE), a hybrid automatic request (HARQ) in a wireless communication system, the method comprising:
receiving a first data from a first eNB through a first radio link;
receiving a second data from at least one second eNB through a second radio link;
combining the first data and the second data;
decoding the combined data; and
feedbacking results of the decoding through at least one of the first radio link or the second radio link,
wherein the first radio link and the second radio link indicate a cell or cell group (CG) of a combining cell group (CCG),
wherein the combining cell group (CCG) indicates a set of at least one cell or cell group capable of transmitting and receiving different HARQ data generated from an identical HARQ transport block (TB), and
wherein the combining comprises:
confirming whether the second radio link is included in the combining cell group (CCG);
based on the second radio link being included in the CCG, confirming whether the second data received through the second radio link is new data or is a retransmission of the first data; and
combining the first data and the second data based on that the second data is the retransmission of the first data.

### Claim 2 (depends on 1)

The method of claim 1, further comprising:
running an HARQ-related timer,
wherein the HARQ-related timer runs when the initial data is received; and
confirming whether the retransmission data has been fully received until the HARQ-related timer expires.

### Claim 3 (depends on 2)

The method of claim 2, wherein if, as a result of the confirmation, the retransmission data has not been fully received until the HARQ-related timer expires, the feedback is performed on HARQ data received until the HARQ-related timer expires.

### Claim 4 (depends on 1)

The method of claim 1, wherein:
the first eNB is a combining primary eNB (CPeNB),
the second eNB is a combining secondary eNB (CSeNB), and
the combining primary eNB is connected to a serving gateway (S-GW) through an S1-U interface.

### Claim 5 (depends on 1)

The method of claim 1, wherein:
the combining cell group (CCG) comprises at least two of a primary cell (Pcell), a primary secondary cell (PScell) and a secondary cell (Scell), or
the combining cell group (CCG) comprises a set of master cell groups (MCGs) or secondary cell groups (SCGs).

### Claim 6 (depends on 1)

The method of claim 1, further comprising:
configuring the combining cell group,
wherein configuring the combining cell group comprises receiving a first message comprising a combining cell group (CCG) information element (IE).

### Claim 7 (depends on 6)

The method of claim 6, wherein the first message is an RRC connection reconfiguration message.

### Claim 8 (depends on 6)

The method of claim 6, wherein the combining cell group information element (CCG IE) comprises at least one of a CCG index field to index a specific CCG, a physical cell identifier (PhysCellid) field indicative of a primary cell or primary cell group of a cell or cell group belonging to the CCG, or a ccg-deadline field indicative of an HARQ-related timer.

### Claim 9 (depends on 6)

The method of claim 6, wherein the combining cell group information element (CCG IE) is exchanged between the first eNB and the second eNB through an X2 interface before the CCG is configured.

### Claim 10 (depends on 6)

The method of claim 6, further comprising:
receiving a second message indicative of an activation or deactivation of the configured combining cell group.

### Claim 11

A user equipment (UE) for performing a hybrid automatic request (HARQ) in a wireless communication system, the user equipment comprising:
a radio frequency (RF) unit for transmitting and receiving radio signals; and
a processor functionally connected to the RF unit, wherein:
the processor controls to:
receive first data from a first eNB through a first radio link;
receive second data from at least one second eNB through a second radio link;
combine the first data and the second data;
decode the combined data; and
feedback results of the decoding through at least one of the first radio link or the second radio link,
wherein the first radio link and the second radio link indicate a cell or cell group (CG) of a combining cell group (CCG), and
wherein the combining cell group (CCG) indicates a set of at least one cell or cell group capable of transmitting and receiving different HARQ data generated from an identical HARQ transport block (TB), and
wherein the processor combines the first data and the second data by:
confirming whether the second radio link is included in the combining cell group (CCG);
based on the second radio link being included in the CCG, confirming whether the second data received through the second radio link is new data or is a retransmission of the first data; and
combining the first data and the second data based on that the second data is the retransmission of the first data.