PTCICH Channel for Flexible TDD Configuration Indication
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Solution Overview
Problem
Conventional methods for indicating Time Division Duplex (TDD) uplink and downlink configurations in wireless communications lack flexibility, leading to unnecessary User Equipment (UE) power consumption and inefficient resource utilization, especially with increased subframe density in 5G networks.
Innovation Solution
The introduction of a Physical TDD Uplink-Downlink Configuration Indicator Channel (PTCICH) that spans less than or equal to 32 Resource Elements, allowing for flexible indication of TDD configurations and reducing the need for UE to decode the Physical Downlink Control Channel (PDCCH) in every subframe, thereby conserving power and resources.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If PDCCH is used to indicate TDD UL-DL configuration in every subframe, then configuration indication is provided, but UE power consumption increases and flexibility is reduced
Solution Approach 1:
The patent implements periodic TDD UL-DL configuration indication where the PTCICH is transmitted only in specific periodic subframes (e.g., every 10 subframes or at configured intervals) rather than in every subframe. This periodic transmission pattern maintains reliable configuration indication while significantly reducing UE power consumption by allowing the UE to enter sleep mode during non-indication subframes.
Solution Approach 2:
The patent extracts the TDD configuration indication function from the general PDCCH and creates a dedicated PTCICH channel for this specific purpose. This extraction allows the indication to be provided more efficiently with reduced overhead and enables the UE to monitor only this specific channel for configuration updates rather than decoding all PDCCH contents in every subframe.
2Reliability
If PDCCH is used for TDD configuration indication, then configuration is provided, but flexibility is reduced
Solution Approach 1:
The patent implements dynamic TDD UL-DL configuration indication through the PTCICH, allowing the network to flexibly change the TDD configuration based on traffic conditions. The configuration can be dynamically updated by transmitting new indication values in the PTCICH at periodic intervals, enabling the system to adapt to varying uplink and downlink traffic demands while maintaining reliable indication through the dedicated channel structure.
3Loss of information
If UE decodes PDCCH in every subframe to determine TDD configuration, then configuration is obtained, but resource utilization becomes inefficient
Solution Approach 1:
The patent introduces the PTCICH as an intermediary channel that carries TDD configuration indication information in a dedicated and optimized format. Instead of requiring the UE to decode general-purpose PDCCH messages in every subframe, the PTCICH provides a specialized intermediary mechanism that delivers configuration information more efficiently, reducing computational resources required while ensuring no configuration information is lost.
Data Source
AI summary
Methods and apparatuses for communicating in a cellular communications network, including provision of a user equipment comprising processing circuitry to: receive from a first cell a control signal comprising a physical Time Division Duplex Uplink-Downlink configuration indicator channel (PTCICH); decode from the PTCICH a Time Division Duplex Uplink-Downlink (TDD UL-DL) configuration; and communicate with the first cell having applied the TDD UL-DL configuration in respect of subframes associated with the first cell, wherein: the PTCICH spans less than or equal to 32 Resource Elements. Also user equipment comprising processing circuitry to: receive a control signal from a first cell; decode the control signal received from the first cell thereby to determine a second cell TDD UL-DL configuration; and communicate with the second cell having applied the second cell TDD UL-DL configuration in respect of subframes associated with the second cell.