Radio Terminal PUSCH Interlace Mapping for PUCCH Coexistence

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Solution Overview

Problem

In mobile communication systems, especially in LTE and LAA environments, there is a challenge in ensuring proper coexistence of Physical Uplink Control Channel (PUCCH) and Physical Uplink Shared Channel (PUSCH) transmissions in the unlicensed spectrum, with existing interlace mapping techniques potentially leading to interference due to the lack of consideration for PUCCH resources.

Innovation Solution

A radio terminal controller is configured to receive control channel information for time-frequency resources used in PUCCH transmission, allowing it to stop or adjust PUSCH transmissions in overlapping resource blocks, and to continue LBT attempts within a predetermined time frame for successful PUCCH transmission, ensuring efficient coexistence and resource allocation.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Productivity

If interlace mapping is applied to PUSCH transmission using multiple resource blocks distributed on frequency axis while overlapping on time axis, then resource utilization efficiency is improved, but interference with PUCCH transmission occurs due to lack of consideration for PUCCH resources

Engineering Contradiction:

Improveresource utilization efficiencyVSAvoidinterference with PUCCH transmission

Core Design Contradiction:

ProductivityVSObject-affected harmful factors

Solution Approach 1:

The patent segments the time-frequency resources by identifying specific resource blocks within the interlace mapping that are allocated for PUCCH transmission. The controller divides the overall resource allocation into PUSCH resource blocks and PUCCH resource blocks, allowing independent management and preventing interference by stopping PUSCH transmission in identified PUCCH resource blocks.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The patent applies preliminary action by having the controller receive control channel information about PUCCH time-frequency resources before performing PUSCH transmission. This advance knowledge allows the controller to pre-identify and avoid resource block conflicts, ensuring PUCCH resources are protected before interference can occur.

Inventive Principle:

Principle #10Preliminary action

2Reliability

If LBT is continuously performed until transmission timing in unlicensed spectrum, then channel access reliability is improved, but transmission delay increases when LBT fails until the allowed time elapses

Engineering Contradiction:

Improvechannel access reliabilityVSAvoidtransmission delay

Core Design Contradiction:

ReliabilityVSLoss of time

Solution Approach 1:

The patent applies partial action by limiting the LBT attempt duration to a predetermined allowed time rather than continuing indefinitely until transmission timing. The controller performs LBT continuously but stops after the allowed time elapses, balancing the need for reliable channel access with the constraint of avoiding excessive transmission delay.

Inventive Principle:

Principle #16Partial or excessive action

Data Source

PatentUS11832351B2Radio terminal

Publication Date: 2023.11.28 KYOCERA CORP

AI summary

A radio terminal according to one embodiment comprises a controller configured to transmit a physical uplink shared channel to a base station by an interlace mapping using a plurality of resource blocks distributed on a frequency axis while overlapping on a time axis. The controller receives, from the base station, control channel information on a time-frequency resource used for transmitting the physical uplink control channel. The controller stops transmission in a specific resource block corresponding to the time-frequency resource from among the plurality of resource blocks, based on the control channel information.