Uplink Control Channel Scheduling Request Transmission via Orthogonal Sequences

Resolve Bottlenecks,
Find Innovative SolutionsGenerate Solutions

Solution Overview

Problem

In wireless communication systems, there is a need for an effective method to transmit a scheduling request on an uplink control channel to request radio resources for uplink data transmission, particularly to address the issue of interference with other control signals and ensure reliable and rapid resource allocation.

Innovation Solution

The method involves configuring an uplink control channel with SC-FDMA symbols, where each SC-FDMA symbol is mapped with frequency domain sequences generated by cyclic shifts of a base sequence, and these sequences are spread using orthogonal sequences, allowing the scheduling request to be transmitted without interfering with other control signals.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Productivity

If scheduling request is transmitted on uplink control channel, then resource allocation efficiency is improved, but interference with other control signals increases

Engineering Contradiction:

Improveresource allocation efficiencyVSAvoidinterference with other control signals

Core Design Contradiction:

ProductivityVSObject-affected harmful factors

Solution Approach 1:

The uplink control channel resources are segmented into different orthogonal sequences, allowing scheduling requests to be transmitted on dedicated resources separate from other control signals like ACK/NACK and CQI, thereby avoiding interference while maintaining efficient resource allocation

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

Orthogonal sequences act as intermediaries that enable multiple control signals to share the same physical channel without interfering with each other, allowing scheduling requests to coexist with other control signals through orthogonal multiplexing

Inventive Principle:

Principle #24Intermediary (Mediator)

2Adaptability or versatility

If scheduling request transmission is added to uplink control channel, then uplink resource request capability is improved, but channel complexity increases

Engineering Contradiction:

Improveuplink resource request capabilityVSAvoidchannel complexity

Core Design Contradiction:

Adaptability or versatilityVSDevice complexity

Solution Approach 1:

The uplink control channel is designed with multi-functionality to handle multiple types of control signals (ACK/NACK, CQI, scheduling requests) using the same physical resources through orthogonal sequence multiplexing, avoiding the need for separate dedicated channels for each signal type

Inventive Principle:

Principle #6Universality (Multi-functionality)

3Object-affected harmful factors

If orthogonal sequences are used for scheduling request, then interference with other control signals is reduced, but processing complexity increases

Engineering Contradiction:

Improveinterference with other control signalsVSAvoidprocessing complexity

Core Design Contradiction:

Object-affected harmful factorsVSDevice complexity

Solution Approach 1:

The system changes the orthogonal sequence parameter (cyclic shift value) to differentiate between scheduling requests and other control signals, allowing simple parameter-based identification and processing without complex signal analysis

Inventive Principle:

Principle #35Parameter changes

Data Source

PatentUS11683144B2Method of transmitting scheduling request in a wireless communication system

Publication Date: 2023.06.20 MICROSOFT TECHNOLOGY LICENSING LLC

AI summary

A method and apparatus for requesting uplink resources in a wireless communication system is provided. A user equipment determines whether a scheduling request for requesting uplink resources is triggered. If the scheduling request is triggered, the user equipment transmits a first set of frequency domain sequences and a second set of frequency domain sequences in a subframe.