User equipment using random access channel (RACH) parameters to adjust transmit power, and method of using the RACH parameters to adjust transmit power

Patent metadata

Field	Value
Publication number	US-10798748-B2
Application number	US-201716312628-A
Country	US
Kind code	B2
Filing date	Jun 5, 2017
Priority date	Jun 24, 2016
Publication date	Oct 6, 2020
Grant date	Oct 6, 2020

Abstract

The user equipment includes a processor configured to receive a broadcast message, the broadcast message including RACH parameters. The processor transmits a first message following receipt of the broadcast message. The processor receives a second message. The processor transmits a third message, the third message including power settings based on a successful transmission of the first message, and receives a fourth message, the fourth message including contention resolution information that adjusts the RACH parameters. The user equipment decodes RACH parameters and the contention information to obtain decoded RACH parameters, and adjusts an initial transmit power of the user equipment to be a first transmit power based on the decoded RACH parameters.

First claim

What is claimed is:

1. A user equipment, comprising:
a memory with computer-readable instructions; and
at least one first processor configured to read the computer-readable instructions, the at least one first processor being configured to,
receive a broadcast message, the broadcast message including random access channel, RACH, parameters,
transmit a first message following receipt of the broadcast message, the first message including RACH preambles,
receive a second message, the second message being an acknowledgement message that acknowledges receipt of the first message,
transmit a third message based on a successful transmission of the first message, the third message including noise rise information, preamble miss information and power settings for the user equipment, the power settings including power information used to transmit the third message,
receive a fourth message, the fourth message including contention resolution information that adjusts the RACH parameters based on the noise rise information and the preamble miss information,
decode RACH parameters and the contention resolution information to obtain decoded RACH parameters, and
adjust the initial transmit power of the user equipment to be a first transmit power based on the decoded RACH parameters.

2. The user equipment of claim 1 , wherein the at least one first processor being is further configured to,
perform an initial cell synchronization process with a first network node prior to receiving the broadcast message.

3. The user equipment of claim 1 , wherein the at least one first processor being is further configured to,
increase the initial transmit power of the user equipment to be a second transmit power based on the decoded RACH parameters.

4. The user equipment of claim 1 , wherein the RACH parameters include at least one of an initial RACH target receive power and a RACH power ramp-up.

5. A method performed by a user equipment, comprising:
receiving, by at least one first processor of the user equipment, a broadcast message, the broadcast message including random access channel, RACH, parameters;
transmitting, by the at least one first processor, a first message following receipt of the broadcast message, the first message including RACH preambles;
receiving, by the at least one first processor, a second message, the second message being an acknowledgement message that acknowledges receipt of the first message;
transmitting, by the at least one first processor, a third message based on a successful transmission of the first message, the third message including noise rise information, preamble miss information and power settings for the user equipment, the power settings including power information used to transmit the third message;
receiving, by the at least one first processor, a fourth message, the fourth message including contention resolution information that adjusts the RACH parameters based on the noise rise information and the preamble miss information;
decoding, by the at least one first processor, RACH parameters and the contention resolution information to obtain decoded RACH parameters; and
adjusting, by the at least one first processor, an initial transmit power of the user equipment to be a first transmit power based on the decoded RACH parameters.

6. The method of claim 5 , further comprising:
performing an initial cell synchronization process with a first network node prior to receiving the broadcast message.

7. The method of claim 5 , further comprising:
increasing the initial transmit power of the user equipment to be a second transmit power based on the decoded RACH parameters.

8. The method of claim 5 , wherein the RACH parameters include at least one of an initial RACH target receive power and a RACH power ramp-up.

Assignees

• Alcatel Lucent Usa Inc
• Nokia America Corp

Inventors

• Tavares Marcos
• Uptegrove Dirck
• Samardzija Dragan

Classifications

• H04W74/0833 Primary

  Random access procedures, e.g. with 4-step access · CPC title

• H04W74/002

  Transmission of channel access control information · CPC title

• H04W28/02

  Traffic management, e.g. flow control or congestion control · CPC title

• H04L27/2663

  Coarse synchronisation, e.g. by correlation · CPC title

• H04L7/042

  Detectors therefor, e.g. correlators, state machines (digital correlators in general G06F17/15) · CPC title