# US 2013/0170457 A1 · Harq process utilization in multiple carrier wireless communications

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- Number: US 2013/0170457 A1
- Document ID: US20130170457A1
- Status: Published application
- Kind: A1
- Application number: 13/775,871
- Filed: 2013-02-25
- Published: 2013-07-04
- Earliest claimed: 2008-04-25
- Assignees: InterDigital Patent Holdings, Inc.
- Inventors: Benoit Pelletier; Jean-Louis Gauvreau; Diana Pani; Christopher R. Cave; Paul Marinier; In H. Kim; Philip J. Pietraski
- Web page: https://patentgrep.com/patent/US20130170457A1

## CPC

- H04L 1/1822: involving configuration of automatic repeat request [ARQ] with parallel processes
- H04L 1/1812: Hybrid protocols; Hybrid automatic repeat request [HARQ]
- H04L 1/1861: {Physical mapping arrangements (for ACK signaling see also H04L5/0053)}
- H04L 5/0005: {Time-frequency}
- H04L 5/0044: {Allocation of payload; Allocation of data channels, e.g. PDSCH or PUSCH}
- H04L 5/0053: {Allocation of signalling, i.e. of overhead other than pilot signals}
- H04W 72/23: in the downlink direction of a wireless link, i.e. towards a terminal
- 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

Methods and apparatus utilize hybrid automatic repeat request (HARQ) transmissions and retransmissions that are usable on multiple carriers, i.e. joint HARQ processes. For example, a downlink (DL) shared channel transmission of a joint HARQ process is received on one of the carriers. A first part of an identity of the joint HARQ process is determined by using HARQ process identity data received on a shared control channel. A second part of the joint HARQ process identity is determined using additional information. The joint HARQ process identity is then determined by combining the first part and the second part. A WTRU is provided that is configured to receive the DL shared channel and to make the aforementioned determinations. A variety of other methods and apparatus configurations are disclosed for utilizing joint HARQ processes, in particular in the context of DC-HSDPA.

## Claims

### Claim 1

A wireless transmit/receive unit (WTRU) comprising:
receiver configured to receive a first downlink control information (DCI) format that is legacy DCI format that does not include component carrier information;
the receiver further configured to receive a configuration message that indicates that the WTRU is to receive a second DCI format using a component carrier; and
the receiver is further configured to receive the second DCI format and to receive a HARQ transmission over the indicated component carrier of the second DCI format.

### Claim 2 (depends on 1)

The WTRU of claim 1 wherein a physical downlink control channel (PDCCH) search space is associated with the second DCI format.

### Claim 3 (depends on 2)

The WTRU of claim 2 wherein the PDCCH search space is a WTRU specific search space.

### Claim 4

A method for receiving downlink control information at a wireless transmit/receive unit (WTRU), the method comprising:
receiving a first DCI format that is legacy DCI format that does not include component carrier information;
receiving a configuration message that indicates that the WTRU is to receive a second DCI format using a component carrier; and
receiving the second DCI format and a HARQ transmission over the indicated component carrier of the second DCI format.

### Claim 5 (depends on 4)

The method of claim 4 wherein a physical downlink control channel (PDCCH) search space is associated with the second DCI format.

### Claim 6 (depends on 5)

The method of claim 5 wherein a PDCCH search space is associated with the at least one second DCI format.

### Claim 7 (depends on 5)

The method of claim 5 wherein the PDCCH search space is a WTRU specific search space.

### Claim 8

An evolved NodeB (eNB) comprising:
a transmitter configured to transmit a first downlink control information (DCI) format that is legacy DCI format that does not include component carrier information;
the transmitter further configured to transmit a configuration message that indicates that a wireless transmit/receive unit (WTRU) is to receive a second DCI format using a component carrier; and
the transmitter further configured to transmit the second DCI format and to transmit a HARQ transmission over the indicated component carrier of the second DCI format.

### Claim 9 (depends on 8)

The eNB of claim 8 wherein the at least one circuit transmits the DCI in a physical downlink control channel (PDCCH) search space associated with the at least one second DCI format.

### Claim 10 (depends on 8)

The eNB of claim 8 wherein the PDCCH search space is a WTRU specific search space.