Wireless Device Random Access Procedure Delay and Abort Mechanism

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Solution Overview

Problem

In wireless communication networks, the random access procedure consumes a large amount of radio resources due to frequent and prolonged unsuccessful attempts, leading to increased interference and reduced resource efficiency, especially in cases of poor radio conditions or high network load.

Innovation Solution

Implementing a mechanism where the wireless device delays or aborts the random access procedure at higher layers or stops it at lower layers when certain conditions are met, such as exceeding a threshold of attempts or receiving an indication of a random access problem, and the radio base station transmits values or indications to manage these delays and attempts.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If the wireless device continues random access preamble transmissions repeatedly, then the probability of successful access may increase, but the consumption of radio resources increases and interference is intensified

Engineering Contradiction:

Improvesuccessful access probabilityVSAvoidradio resource consumption

Core Design Contradiction:

ReliabilityVSLoss of energy

Solution Approach 1:

The patent implements dynamic adjustment of random access parameters including delay timing, number of attempts, and power levels based on real-time radio conditions and network responses. This allows the system to adapt transmission behavior to current conditions, maintaining access reliability while minimizing unnecessary resource consumption when access fails due to factors beyond transmission power.

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The system uses feedback from network responses (or lack thereof) to adjust subsequent random access behavior. When no response is received or negative acknowledgment is obtained, the device modifies its retry strategy according to configured parameters, preventing indefinite repeated transmissions that would waste resources while still attempting access when conditions permit.

Inventive Principle:

Principle #23Feedback

2Reliability

If the wireless device increases transmission power for random access preambles, then the reach and success rate improve, but the interference to other users and resource consumption increase

Engineering Contradiction:

Improveaccess success rateVSAvoidinterference

Core Design Contradiction:

ReliabilityVSObject-generated harmful factors

Solution Approach 1:

The patent dynamically changes transmission parameters including power level, timing, and frequency based on radio conditions and network responses. This allows the device to use higher power only when necessary for successful access while using lower power in conditions where it would cause unnecessary interference, thus balancing reliability with harm reduction.

Inventive Principle:

Principle #35Parameter changes

3Adaptability or versatility

If the random access procedure is allowed to continue without limits, then devices in poor radio conditions can eventually access the network, but system performance degrades under high load

Engineering Contradiction:

Improveaccess capability in poor conditionsVSAvoidsystem performance

Core Design Contradiction:

Adaptability or versatilityVSProductivity

Solution Approach 1:

The system dynamically adjusts random access behavior based on network load and radio conditions. Under high load, the network can configure more restrictive retry parameters to protect system performance, while in lighter conditions, devices are allowed more attempts and longer delays to access the network, thus adapting to current system state.

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The network pre-configures random access parameters including maximum attempts, delay values, and power levels before the access procedure begins. This preliminary configuration allows the system to establish appropriate limits and strategies in advance, preventing excessive resource consumption while still providing adequate access opportunities for devices in poor conditions.

Inventive Principle:

Principle #10Preliminary action

Data Source

PatentUS10143012B2Random access procedure in wireless device, radio base station and methods therein

Publication Date: 2018.11.27 TELEFONAKTIEBOLAGET LM ERICSSON (PUBL)

AI summary

Embodiments herein relate to a wireless device (10) for handling access to a radio base station (12) in a wireless communication network (1), the wireless device (10) being configured to:initiate a random access procedure in the wireless communication network (1);determine that a problem with the random access procedure has occurred when a certain condition is fulfilled; andperform at least one of the following, when determined that a problem with the random access procedure has occurred: delay a next random access preamble transmission attempt; abort from a higher layer the random access procedure immediately; and stop the random access procedure at a lower layer.