Circular Shifts for Implicit Signaling in Wireless Data Transmission

Resolve Bottlenecks,
Find Innovative SolutionsGenerate Solutions

Solution Overview

Problem

In wireless communication networks, repeated transmissions without acknowledgement lead to inefficient use of radio resources and reduced performance due to non-stationary radio channels, especially when explicit signaling is costly and coherency is lost.

Innovation Solution

The method involves determining an order of different circular shifts of repeated blocks of data as transmission parameters to implicitly convey additional information, allowing for improved spectral efficiency without increasing radio resource consumption, using techniques like interleavers or circular shifts during blind repetitions.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If repeated transmissions are performed without acknowledgement to improve reliability in extended coverage, then reliability is improved, but radio resource consumption increases

Engineering Contradiction:

Improvedecoding probabilityVSAvoidradio resource consumption

Core Design Contradiction:

ReliabilityVSQuantity of substance

Solution Approach 1:

The patent applies parameter changes by varying transmission parameters (such as circular shifts, interleaving patterns, or modulation schemes) across repeated transmissions. This allows the receiver to combine multiple versions of the same data with different parameters, improving decoding probability while maintaining efficient use of radio resources through implicit signaling rather than explicit retransmissions.

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent segments the repeated transmissions by applying different processing parameters to each repetition. Each segment (repeated block) is transmitted with distinct parameters that the receiver can exploit for combining, effectively dividing the transmission task into manageable segments that collectively improve reliability without proportionally increasing resource consumption.

Inventive Principle:

Principle #1Segmentation

2Loss of information

If explicit signaling is used to convey additional information, then information transfer is improved, but radio resource consumption increases

Engineering Contradiction:

Improveinformation transferVSAvoidradio resource consumption

Core Design Contradiction:

Loss of informationVSQuantity of substance

Solution Approach 1:

The patent makes transmission parameters serve multiple functions: they control the physical layer transmission characteristics while simultaneously encoding additional information. By making parameters universal, the system conveys information implicitly through parameter selection rather than through dedicated signaling resources, thus improving information transfer without increasing radio resource consumption.

Inventive Principle:

Principle #6Universality (Multi-functionality)

Solution Approach 2:

The patent uses transmission parameters as intermediaries to convey additional information. Instead of directly transmitting information bits that would consume radio resources, the system embeds information in the choice of transmission parameters, which mediate between the data to be transmitted and the physical layer transmission, enabling efficient implicit signaling.

Inventive Principle:

Principle #24Intermediary (Mediator)

3Power

If coherently accumulated repeated transmissions are used to maximize processing gain, then processing gain is improved, but channel stationarity requirement reduces adaptability

Engineering Contradiction:

Improveprocessing gainVSAvoidchannel condition adaptability

Core Design Contradiction:

PowerVSAdaptability or versatility

Solution Approach 1:

The patent introduces dynamics by allowing the system to adapt transmission parameters based on channel conditions. Rather than requiring strict channel stationarity for coherent accumulation, the system dynamically adjusts parameters (such as selecting different circular shifts or interleaving patterns) to maintain effective combining under varying channel conditions, thus preserving processing gain while improving adaptability.

Inventive Principle:

Principle #15Dynamics

Data Source

PatentUS10320527B2Methods and arrangements relating to transmission of additional information from a transmitting device to a receiving device in a wireless communications network

Publication Date: 2019.06.11 TELEFONAKTIEBOLAGET LM ERICSSON (PUBL)

AI summary

A transmitting device (12) and a receiving device (10) in a wireless communications network (1). The transmitting device (12) determines (701) additional information to transmit to the receiving device (10). The transmitting device (12) determined (702) an order of different circular shifts of repeated blocks of data as a set of transmission parameters indicating the additional information, each circular shift shifting bits differently. The transmitting device (12) then transmits (703) information to the receiving device (10), which receives the information, using the determined set of transmission parameters, thereby indicating the additional information to the receiving device (10).