# US 11,122,616 B2 · Method and apparatus for allocating radio resource using random access procedure in a mobile communication system

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- Number: US 11,122,616 B2
- Document ID: US11122616B2
- Status: Granted
- Kind: B2
- Application number: 16/659,115
- Filed: 2019-10-21
- Published: 2020-02-13
- Granted: 2021-09-14
- Earliest claimed: 2006-10-25
- Assignees: Samsung Electronics Co., Ltd.
- Applicants: Samsung Electronics Co., Ltd.
- Inventors: Kyeong-In Jeong; Himke Van Der Velde; Gert Jan Van Lieshout; Yong-Jun Kwak; Soeng-Hun Kim
- Web page: https://patentgrep.com/patent/US11122616B2

## CPC

- H04W 74/004: {in the uplink, i.e. towards network}
- H04L 5/0016: {Time-frequency-code}
- H04L 5/003: {Arrangements for allocating sub-channels of the transmission path}
- H04L 5/0053: {Allocation of signalling, i.e. of overhead other than pilot signals}
- H04W 48/10: using broadcasted information
- H04W 72/1268: of uplink data flows
- H04W 72/542: using measured or perceived quality
- H04W 74/002: {Transmission of channel access control information}
- H04W 74/0833: Random access procedures, e.g. with 4-step access
- H04W 74/0866: {using a dedicated channel for access}
- H04W 72/543: based on requested quality, e.g. QoS
- H04W 84/042: {Public Land Mobile systems, e.g. cellular systems}
- 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

Disclosed is a method for performing a random access by a user equipment (UE), including identifying a path loss and a size of a message that the UE will transmit after a transmission of a preamble, selecting a preamble set from at least two preamble sets based on a first threshold and a second threshold, wherein a first preamble set is selected if the path loss is less than the first threshold and the size of the message is greater than the second threshold, wherein a second preamble set is selected if the path loss is greater than or equal to the first threshold, or the size of the message is less than or equal to the second threshold, selecting a preamble from the selected preamble set, transmitting, to a base station, the selected preamble, receiving, from the base station, a random access response message including resource allocation information in response to the transmission of the selected preamble, and transmitting, to the base station, a radio resource control message based on the resource allocation information.

## Claims

### Claim 1

A method for performing a random access by a user equipment (UE) in a wireless communication system, the method comprising:
identifying a path loss and a size of a message that the UE will transmit after a transmission of a preamble;
selecting a preamble set from at least two preamble sets based on a first threshold and a second threshold, wherein a first preamble set is selected if the path loss is less than the first threshold and the size of the message is greater than the second threshold, wherein a second preamble set is selected if the path loss is greater than or equal to the first threshold, or the size of the message is less than or equal to the second threshold;
selecting a preamble from the selected preamble set;
transmitting, to a base station, the selected preamble;
receiving, from the base station, a random access response message including resource allocation information in response to the transmission of the selected preamble; and
transmitting, to the base station, a radio resource control message based on the resource allocation information.

### Claim 2 (depends on 1)

The method of claim 1,
wherein the path loss is determined by comparing a transmission power to a reception power for a downlink pilot channel.

### Claim 3 (depends on 1)

The method of claim 1,
wherein the first threshold is associated with a maximum transmission power and a value in system information broadcasted by the base station.

### Claim 4 (depends on 1)

The method of claim 1,
wherein the second threshold is configured by broadcasted system information.

### Claim 5 (depends on 1)

The method of claim 1,
wherein the random access response message comprises at least one of a preamble identifier mapped to the transmitted selected preamble, uplink sync information, and resource information for a next uplink message transmission.

### Claim 6

A user equipment (UE) for performing a random access in a wireless communication system, the UE comprising:
a transceiver configured to transmit or receive data; and
a controller configured to:
identify a path loss and a size of a message that the UE will transmit after a transmission of a preamble,
select a preamble set from at least two preamble sets based on a first threshold and a second threshold, wherein a first preamble set is selected if the path loss is less than the first threshold and the size of the message is greater than the second threshold, and wherein a second preamble set is selected if the path loss is greater than or equal to the first threshold, or the size of the message is less than or equal to the second threshold,
select a preamble from the selected preamble set,
transmit, to a base station, the selected preamble,
receive, from the base station, a random access response message including resource allocation information in response to the transmission of the selected preamble, and
transmit, to the base station, a radio resource control message based on the resource allocation information.

### Claim 7 (depends on 6)

The UE of claim 6,
wherein the path loss is determined by comparing a transmission power to a reception power for a downlink pilot channel.

### Claim 8 (depends on 6)

The UE of claim 6,
wherein the first threshold is associated with a maximum transmission power and a value in system information broadcasted by the base station.

### Claim 9 (depends on 6)

The UE of claim 6,
wherein the second threshold is configured by broadcasted system information.

### Claim 10 (depends on 6)

The UE of claim 6,
wherein the random access response message comprises at least one of a preamble identifier mapped to the transmitted selected preamble, uplink sync information, and resource information for a next uplink message transmission.

### Claim 11

A method for performing a random access by a user equipment (UE) in a wireless communication system, the method comprising:
identifying a size of a message that the UE will transmit after a transmission of a preamble;
selecting a preamble set from at least two preamble sets based on a first threshold and a second threshold, wherein a first preamble set is selected if a radio channel condition is greater than the first threshold and the size of the message is greater than the second threshold, and wherein a second preamble set is selected if the radio channel condition is less than or equal to the first threshold or the size of the message is less than or equal to the second threshold;
selecting a preamble from the selected preamble set;
transmitting, to a base station, the selected preamble;
receiving, from the base station, a random access response message including resource allocation information in response to the transmission of the selected preamble; and
transmitting, to the base station, a radio resource control message based on the resource allocation information.