Random Access Procedure for NR Scheduling Requests

Solution Overview

Problem

The random access procedure for Scheduling Requests in wireless communication systems is inefficient, leading to increased latency, power consumption, and resource inefficiency, especially when no valid PUCCH resources are available.

Innovation Solution

Delaying the initiation of the random access procedure for Scheduling Requests and canceling it if uplink control channel resources are assigned during this delay period, allowing the use of assigned resources for transmitting the Scheduling Request instead of the random access procedure.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If the random access procedure is initiated immediately when no PUCCH resources are available, then the Scheduling Request can be transmitted, but the uplink latency increases and power consumption increases

Engineering Contradiction:

ImproveScheduling Request transmission reliabilityVSAvoiduplink latency

Core Design Contradiction:

ReliabilityVSLoss of time

Solution Approach 1:

The patent applies preliminary action by introducing a delay period before initiating the random access procedure. During this delay period, the UE monitors for dynamically granted uplink resources that could be used for Scheduling Request transmission. This preliminary waiting action allows the system to potentially use more efficient resources while maintaining the ability to fall back to random access if needed, thus reducing overall latency while preserving transmission reliability.

Inventive Principle:

Principle #10Preliminary action

2Reliability

If the random access procedure is initiated immediately when no PUCCH resources are available, then the Scheduling Request can be transmitted, but power consumption increases

Engineering Contradiction:

ImproveScheduling Request transmission reliabilityVSAvoidpower consumption

Core Design Contradiction:

ReliabilityVSUse of energy by moving object

Solution Approach 1:

The patent applies preliminary action by introducing a delay period before initiating the random access procedure. During this delay period, the UE monitors for dynamically granted uplink resources that could be used for Scheduling Request transmission. This preliminary waiting action allows the system to potentially use more efficient resources while maintaining the ability to fall back to random access if needed, thus reducing overall latency while preserving transmission reliability.

Inventive Principle:

Principle #10Preliminary action

3Reliability

If the random access procedure is initiated immediately when no PUCCH resources are available, then the Scheduling Request can be transmitted, but the Random Access Channel load increases

Engineering Contradiction:

ImproveScheduling Request transmission reliabilityVSAvoidRandom Access Channel load

Core Design Contradiction:

ReliabilityVSQuantity of substance

Solution Approach 1:

The patent applies preliminary action by introducing a delay period before initiating the random access procedure. During this delay period, the UE monitors for dynamically granted uplink resources that could be used for Scheduling Request transmission. This preliminary waiting action allows the system to potentially use more efficient resources while maintaining the ability to fall back to random access if needed, thus reducing overall latency while preserving transmission reliability.

Inventive Principle:

Principle #10Preliminary action

Data Source

PatentEP3530054B1Random access for nr

Publication Date: 2024.06.19 NOKIA TECHNOLOGIES OY

Figure 1
Figure 2
Figure 3A

AI summary

There is provided a method comprising: determining that there are no uplink resources available for transmitting a Scheduling Request; initiating a timer in response to said determination; and if said timer expires, on expiry of said timer, initiating a random access procedure on the uplink.