# US 10,455,615 B2 · Method and apparatus for allocating radio resource using random access procedure in a mobile communication system

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- Number: US 10,455,615 B2
- Document ID: US10455615B2
- Status: Granted
- Kind: B2
- Application number: 15/727,136
- Filed: 2017-10-06
- Published: 2018-02-01
- Granted: 2019-10-22
- 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/US10455615B2

## 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 in a wireless communication, including identifying a channel condition and a size of a message that a user equipment will transmit after a transmission of a preamble, selecting a first preamble set from at least two preamble sets if the channel condition is greater than a first threshold and the size of the message is greater than a second threshold, selecting a preamble from the selected first preamble set if the first preamble set is selected, 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, the message based on the resource allocation information.

## Claims

### Claim 1

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

### Claim 2 (depends on 1)

The method of claim 1, further comprising:
selecting a second preamble set from the at least two preamble sets if the 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; and
selecting a preamble from the selected second preamble set if the second preamble set is selected.

### Claim 3 (depends on 1)

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

### Claim 4 (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 5 (depends on 1)

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

### Claim 6 (depends on 1)

The method of claim 1, wherein the RAR message further includes at least one of a preamble identifier mapped to the transmitted selected preamble, uplink synchronization information, and resource information for a next uplink message transmission.

### Claim 7

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

### Claim 8 (depends on 7)

The apparatus of claim 7, wherein the controller is further configured to select a second preamble set from the at least two preamble sets if the 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, and to select a preamble from the selected second preamble set if the second preamble set is selected.

### Claim 9 (depends on 7)

The apparatus of claim 7, wherein the channel condition is determined by comparing a transmission power to a reception power for a downlink pilot channel.

### Claim 10 (depends on 7)

The apparatus of claim 7, wherein the first threshold is associated with a maximum transmission power and a value in system information broadcasted by the base station.

### Claim 11 (depends on 7)

The apparatus of claim 7, wherein the second threshold is configured by broadcasted system information.

### Claim 12 (depends on 7)

The apparatus of claim 7, wherein the RAR message further includes at least one of a preamble identifier mapped to the transmitted selected preamble, uplink synchronization information, and resource information for a next uplink message transmission.