# US 10,321,444 B2 · Method for processing NDI in random access procedure and a method for transmitting and receiving a signal using the same

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- Number: US 10,321,444 B2
- Document ID: US10321444B2
- Status: Granted
- Kind: B2
- Application number: 15/612,864
- Filed: 2017-06-02
- Published: 2017-09-21
- Granted: 2019-06-11
- Earliest claimed: 2008-07-03
- Assignees: LG Electronics Inc.
- Applicants: LG Electronics Inc.
- Inventors: Sung Jun Park; Seung June Yi; Young Dae Lee; Sungduck Chun
- Web page: https://patentgrep.com/patent/US10321444B2

## CPC

- H04W 72/21: in the uplink direction of a wireless link, i.e. towards the network
- H04L 1/1812: Hybrid protocols; Hybrid automatic repeat request [HARQ]
- H04L 1/1822: involving configuration of automatic repeat request [ARQ] with parallel processes
- H04L 1/1887: {Scheduling and prioritising arrangements}
- H04W 72/23: in the downlink direction of a wireless link, i.e. towards a terminal
- H04W 74/006: {in the downlink, i.e. towards the terminal}
- H04W 74/0833: Random access procedures, e.g. with 4-step access
- H04W 74/0838: using contention-free random access [CFRA]
- H04W: WIRELESS COMMUNICATION NETWORKS (broadcast communication H04H; communication systems using wireless links for non-selective communication, e.g. wireless extensions H04M1/72)
- H04L: TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION (arrangements common to telegraphic and telephonic communication H04M)

## Abstract

A method for transmitting an uplink signal by a user equipment (UE). The method includes receiving an uplink grant including a new data indicator (NDI) on a physical downlink control channel (PDCCH) from a network, determining whether the PDCCH is not addressed to a temporary cell identifier, determining whether the NDI has been toggled when the PDCCH is not addressed to the temporary cell identifier, and transmitting a new data to the network when the NDI has been toggled.

## Claims

### Claim 1

A method for transmitting an uplink signal by a user equipment (UE), the method comprising:
receiving an uplink grant including a new data indicator (NDI) through a physical downlink control channel (PDCCH) from a network;
determining whether the PDCCH is not addressed to a temporary cell identifier;
determining whether the NDI has been toggled when the PDCCH is not addressed to the temporary cell identifier; and
transmitting a new data through a physical uplink shared channel (PUSCH) to the network when the NDI has been toggled.

### Claim 2 (depends on 1)

The method of claim 1, further comprising:
performing a retransmission through the PUSCH, when the NDI has not been toggled.

### Claim 3

A user equipment (UE) comprising:
a receiver configured to receive an uplink grant including a new data indicator (NDI) through a physical downlink control channel (PDCCH) from a network;
a processor configured to determine whether the PDCCH is not addressed to a temporary cell identifier, and to determine whether the NDI has been toggled when the PDCCH is not addressed to the temporary cell identifier; and
a transmitter configured to transmit a new data through a physical uplink shared channel (PUSCH) to the network when the NDI has been toggled.

### Claim 4 (depends on 3)

The UE of claim 3, wherein the processor is further configured to control the transmitter to perform a retransmission through the PUSCH, when the NDI has not been toggled.