Adaptive TDD Coexistence for Legacy and New UEs

Resolve Bottlenecks,
Find Innovative SolutionsGenerate Solutions

Solution Overview

Problem

In adaptive TDD systems, legacy UEs cannot interpret dynamic TDD configuration changes sent through dedicated signaling, leading to interference with new released UEs during data transmission.

Innovation Solution

Implementing TDD grouping, restricted PRACH resource allocation, and harmonized DL/UL data transmission scheduling with HARQ processes to ensure coexistence and non-interference between legacy and new released UEs by using common subframes and extending system information blocks.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If dynamic TDD configuration changes are sent through dedicated signaling to new released UEs, then system adaptability and throughput are improved, but legacy UEs cannot interpret these changes leading to transmission interference

Engineering Contradiction:

ImproveTDD configuration adaptabilityVSAvoidinterference between legacy and new released UEs

Core Design Contradiction:

Adaptability or versatilityVSObject-generated harmful factors

Solution Approach 1:

The patent segments UEs into two categories: legacy UEs and new released UEs. Different signaling mechanisms are applied to each segment - new released UEs receive dynamic TDD configuration through dedicated signaling while legacy UEs rely on semi-static configuration through system information blocks, preventing interference between the two groups

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The patent introduces common subframes as an intermediary mechanism. These subframes are configured to be identical for both legacy and new released UEs, serving as a common reference that prevents interpretation conflicts and transmission interference between the two UE types

Inventive Principle:

Principle #24Intermediary (Mediator)

2Reliability

If semi-static TDD configuration is broadcasted in system information block, then legacy UEs can operate correctly, but the configuration cannot match instantaneous traffic situation leading to reduced system throughput

Engineering Contradiction:

Improvelegacy UE operation reliabilityVSAvoidsystem throughput

Core Design Contradiction:

ReliabilityVSProductivity

Solution Approach 1:

The patent implements dynamic TDD configuration for new released UEs that can adapt to instantaneous traffic conditions. The system transitions from purely semi-static configuration to a dynamic configuration mechanism that adjusts TDD UL-DL configurations based on real-time traffic requirements, thereby improving system throughput while maintaining legacy UE compatibility

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The system implements a universal configuration approach where common subframes are defined that work for both legacy UEs (semi-static) and new released UEs (dynamic). This multi-functional design allows the system to support both UE types simultaneously with a unified framework

Inventive Principle:

Principle #6Universality (Multi-functionality)

Data Source

PatentUS9794803B2System and methods of dynamic TDD configurations

Publication Date: 2017.10.17 HFI INNOVATION INC

AI summary

Solutions to support the coexistence of legacy UEs and new released UEs in adaptive TDD systems are proposed. Methods of TDD grouping, RACH (random access channel) resource allocation, and DL/UL data transmission and HARQ (Hybrid Automatic Repeat Request) process to serve legacy UEs without interfering the operation of new released UEs are proposed. With the methods proposed in this invention, both the legacy UEs and the new released UEs can be served in the adaptive TDD systems and the data transmission from the legacy UEs would not interfere the data reception of the new released UEs.