Base Station TTI Bundling for Wireless Relay Backhaul Delay

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Solution Overview

Problem

Wireless relay base stations experience communication delays due to scheduling and routing processes, which can be problematic for delay-sensitive communications like voice and real-time media, especially when using wireless backhaul connections.

Innovation Solution

Implementing Transmission Time Interval (TTI) bundling in base stations to expedite air interface communications by automatically performing multiple transmission attempts without waiting for re-transmission requests, specifically for relay-WCDs that provide wireless backhaul connectivity.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Ease of manufacture

If wireless relay base stations use standard scheduling and routing processes for backhaul connections, then network infrastructure can be simplified and deployment easier, but communication delay increases significantly

Engineering Contradiction:

Improvedeployment simplicityVSAvoidcommunication delay

Core Design Contradiction:

Ease of manufactureVSLoss of time

Solution Approach 1:

The patent applies preliminary action by performing multiple transmission attempts in advance within a bundled TTI interval before seeking re-transmission requests. This proactively ensures data delivery without waiting for failure confirmation, thereby reducing communication delay while maintaining standard network infrastructure deployment

Inventive Principle:

Principle #10Preliminary action

2Device complexity

If standard re-transmission protocols are used for relay-WCDs, then device complexity remains low, but communication reliability deteriorates due to increased delay

Engineering Contradiction:

Improveprotocol complexityVSAvoidcommunication reliability

Core Design Contradiction:

Device complexityVSReliability

Solution Approach 1:

The patent merges multiple transmission attempts into a single bundled TTI interval, combining several transmission opportunities that would normally be separate. This merging approach improves communication reliability by ensuring multiple attempts within one scheduling interval while maintaining low device complexity as the base station handles the bundling logic

Inventive Principle:

Principle #5Merging (Combining)

Data Source

PatentUS10172029B1Controlling TTI bundling based on whether device provides wireless relay backhaul connectivity

Publication Date: 2019.01.01 SPRINT SPECTRUM LLC

AI summary

A method and system for a base station to manage air interface communications with a wireless client device (WCD) served by the base station, taking into account whether the WCD is a relay-WCD that provides wireless backhaul connectivity for a relay base station. The base station will determine whether the served WCD is a relay-WCD, and based on a determination that the served WCD is a relay-WCD, the base station will responsively invoke a process to help expedite air interface communications with the served WCD, in an effort to reduce the total delay resulting from the wireless relay arrangement. In particular, based on the served WCD being a relay-WCD, and perhaps based on the relay-WCD facilitating a threshold extent of delay-sensitive communication, the base station will invoke transmission time interval (TTI) bundling, to help expedite the air interface communications between the base station and the relay-WCD.