Base Station Frame Uplink Grant Transmission Latency

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Solution Overview

Problem

In communication systems, when uplink traffic is included in downlink traffic, the time required for acquiring an uplink grant leads to excess latency due to dynamic scheduling.

Innovation Solution

A communication apparatus and method that generates a frame including transmission grant information for the communication terminal to transmit a receive response signal, allowing for immediate transmission without waiting for a scheduling request, and includes channel resource allocation information to reduce latency, using a transmission grant index to reuse previous grant information.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Loss of time

If dynamic scheduling is used for uplink traffic included in downlink traffic, then channel resource assignment is achieved, but latency increases due to the time required for grant acquisition

Engineering Contradiction:

ImprovelatencyVSAvoidscheduling process complexity

Core Design Contradiction:

Loss of timeVSDevice complexity

Solution Approach 1:

The base station transmits uplink grant information in advance within downlink data frames before the communication terminal actually needs to send uplink traffic. This preliminary transmission of grant information eliminates the need for the terminal to wait and send scheduling requests, directly reducing the latency associated with grant acquisition while maintaining the dynamic scheduling framework

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The system prepares and transmits uplink grant information beforehand as a form of cushioning against future scheduling requests. By having the grant information ready and transmitted in advance within downlink frames, the system cushions the terminal from experiencing scheduling delays, ensuring immediate uplink transmission capability when needed

Inventive Principle:

Principle #11Beforehand cushioning (Prior cushioning)

2Productivity

If the base station waits for a scheduling request from the communication terminal, then dynamic scheduling is maintained, but transmission latency increases

Engineering Contradiction:

Improvecommunication efficiencyVSAvoidprocessing time

Core Design Contradiction:

ProductivityVSLoss of time

Solution Approach 1:

Instead of the conventional approach where the terminal initiates scheduling by sending a scheduling request, the base station inverts the initiative by proactively transmitting uplink grant information within downlink data frames. This inversion eliminates the terminal's scheduling request step, reducing processing time and improving communication efficiency

Inventive Principle:

Principle #13The other way round (Inversion)

Solution Approach 2:

The base station performs self-service by autonomously determining and transmitting uplink grant information without waiting for terminal requests. This self-service approach allows the base station to optimize uplink resource allocation proactively, reducing overall scheduling latency and improving system productivity

Inventive Principle:

Principle #25Self-service

3Loss of time

If uplink grant information is transmitted in advance within downlink data frames, then latency is reduced, but frame structure complexity increases

Engineering Contradiction:

Improvegrant acquisition timeVSAvoidframe structure complexity

Core Design Contradiction:

Loss of timeVSDevice complexity

Solution Approach 1:

The patent merges uplink grant information transmission with downlink data frame transmission by embedding the grant information within the existing downlink frame structure. This combining approach allows simultaneous transmission of both downlink data and uplink grants without requiring separate signaling channels, reducing grant acquisition time while managing frame structure complexity through integration

Inventive Principle:

Principle #5Merging (Combining)

Solution Approach 2:

The downlink data frame is given multi-functionality by serving both its original purpose of carrying downlink data and the additional function of conveying uplink grant information. This universal usage of the downlink frame structure reduces the need for separate signaling mechanisms, lowering overall system complexity while enabling advance grant transmission to reduce latency

Inventive Principle:

Principle #6Universality (Multi-functionality)

Data Source

PatentUS11463907B2Base station equipment, communication terminal, communication system, program, frame transmitting method, and data structure

Publication Date: 2022.10.04 TOYOTA JIDOSHA KK

AI summary

If the sequence of a traffic of a first communication link from a communication apparatus to another communication apparatus includes a traffic of a second communication link from that another communication apparatus to a communication apparatus, latency is reduced, thereby saving processing time.If, after data is transmitted from a communication apparatus to another communication apparatus by the upper layer, a data receive response signal is required from that another communication apparatus to the communication apparatus, a predetermined frame including transmission grant information for that another communication apparatus to transmit the receive response signal and data is generated in the communication apparatus. The communication apparatus transmits this generated frame to that another communication apparatus. That is, data and transmission grant information are transmitted from the communication apparatus to that another communication apparatus as a predetermined frame.