Random Access Power Parameter Optimization for Latency Reduction

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Solution Overview

Problem

Existing random access methods in communication systems require terminal devices to perform multiple power ramping cycles to successfully send a preamble, leading to increased latency and reduced reliability, especially for devices with high latency requirements.

Innovation Solution

A method where a terminal device reports its power parameter and UL TA to the base station during random access, allowing the base station to optimize the transmission power and UL TA configuration, thereby reducing latency and improving data transmission reliability.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Object-affected harmful factors

If the base station configures a low power parameter for the terminal device to send the preamble, then the interference to other cells is reduced, but the terminal device needs to perform multiple power ramping cycles which increases latency

Engineering Contradiction:

Improveinterference to other cellsVSAvoidlatency of random access

Core Design Contradiction:

Object-affected harmful factorsVSLoss of time

Solution Approach 1:

The base station pre-configures multiple power parameters (first power parameter and second power parameter) for different transmission scenarios before the terminal device needs to send the preamble. This allows the terminal device to select the appropriate power parameter in advance without needing to perform multiple power ramping cycles, thereby reducing latency while controlling interference.

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The system dynamically adjusts the power parameter based on the terminal device's transmission history. The base station configures different power parameters that can be selected based on whether the terminal has previously failed to send the preamble successfully, allowing adaptive power control that balances interference reduction with access latency.

Inventive Principle:

Principle #15Dynamics

2Use of energy by moving object

If the base station configures a low power parameter for the terminal device, then power consumption is reduced, but the reliability of data transmission decreases due to multiple ramping cycles

Engineering Contradiction:

Improvepower consumption of terminal deviceVSAvoidreliability of data transmission

Core Design Contradiction:

Use of energy by moving objectVSReliability

Solution Approach 1:

The base station pre-configures multiple power parameters for different transmission scenarios before the terminal device needs to send the preamble. This allows the terminal device to select the appropriate power parameter in advance, ensuring reliable transmission in the first attempt and reducing the need for repeated transmissions, thereby maintaining reliability while managing power consumption.

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The system changes the power parameter based on the transmission scenario. The base station configures a first power parameter for normal conditions and a second power parameter for cases where previous transmissions failed, allowing the terminal to adapt power levels to maintain reliability while avoiding unnecessary high power consumption.

Inventive Principle:

Principle #35Parameter changes

3Reliability

If the terminal device performs multiple power ramping cycles to successfully send the preamble, then the transmission power is sufficient to overcome path loss, but the latency of random access increases

Engineering Contradiction:

Improvesuccess of preamble transmissionVSAvoidlatency of random access

Core Design Contradiction:

ReliabilityVSLoss of time

Solution Approach 1:

The base station pre-configures multiple power parameters (first power parameter and second power parameter) for different transmission scenarios before the terminal device needs to send the preamble. This allows the terminal device to select the appropriate power parameter in advance based on whether it has previously failed to send the preamble successfully, thereby achieving reliable transmission in fewer attempts and reducing random access latency.

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The system uses feedback from the base station about whether the preamble was successfully received to guide the terminal device's power parameter selection. If the preamble transmission fails, the terminal device uses feedback information to select a different power parameter from the pre-configured options, improving success probability in subsequent attempts and reducing overall latency.

Inventive Principle:

Principle #23Feedback

Data Source

PatentUS11540316B2Random access method and device

Publication Date: 2022.12.27 GUANGDONG OPPO MOBILE TELECOMMUNICATIONS CORP LTD

AI summary

Provided are a random access method and device, which may reduce the latency of a terminal device in a random access process and improve the reliability of a first message (MSG) in the random access process. The method includes that: in response to a terminal device initiating random access to a base station of a target cell and the random access is successful, and the terminal device sends first information to the base station of the target cell, the first information including at least one of an Uplink (UL) Timing Advance (TA) and a parameter related to transmission power for a preamble.