NR PDCCH Interleaver Design for Frequency Diversity

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Solution Overview

Problem

The existing LTE PDCCH interleaver design cannot meet the requirements of New Radio (NR) systems due to the increased bandwidth and the need for greater frequency diversity gains, as well as the limitation that the minimum interleaving unit in NR is a Resource Element Group (REG) bundle rather than an individual REG.

Innovation Solution

A method for interleaving the Physical Downlink Control Channel (PDCCH) in NR systems, which involves mapping modulation symbol groups into a target interleaving matrix and rearranging the elements to create a symbol group sequence that is mapped to M RE sets in the order of frequency, ensuring even distribution and maximizing frequency diversity gains.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If the existing LTE PDCCH interleaver design is used, then the implementation is simple, but it cannot meet the frequency diversity requirements of NR systems with larger bandwidth

Engineering Contradiction:

Improvefrequency diversity gainsVSAvoidinterleaver design complexity

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The patent changes the fundamental parameters of the interleaver design by switching from REG-based interleaving with fixed 32 columns to REG bundle-based interleaving with configurable columns. This allows the interleaver to adapt to NR's larger bandwidth while maintaining manageable complexity through parameter configurability rather than structural overhaul.

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent segments the PDCCH resource elements into REG bundles as the basic interleaving unit, rather than individual REGs. This segmentation approach allows for more effective frequency diversity by distributing REG bundles across the bandwidth, addressing the limitation of the existing design in NR's larger bandwidth context.

Inventive Principle:

Principle #1Segmentation

2Adaptability or versatility

If the minimum interleaving unit is set to REG bundle rather than REG, then it aligns with NR resource allocation, but reduces the granularity of interleaving control

Engineering Contradiction:

Improvecompatibility with NR resource allocationVSAvoidinterleaving control granularity

Core Design Contradiction:

Adaptability or versatilityVSManufacturing precision

Solution Approach 1:

The patent introduces dynamic configurability to the interleaver design, allowing the number of columns and other parameters to be adjusted based on specific NR deployment scenarios. This dynamic approach enables the system to balance between using REG bundles as the basic unit for NR compatibility and achieving sufficient interleaving granularity when needed.

Inventive Principle:

Principle #15Dynamics

Data Source

PatentUS12294548B2Method and device in UE and base station used for dynamic scheduling

Publication Date: 2025.05.06 SHANGHAI QIYU COMM TECH SERVICE CENT

AI summary

A method and a device in a User Equipment and a base station are provided. The UE receives first information and monitors a first signaling in M Resource Element (RE) sets. The first information determines the M RE sets. The UE assumes that P modulation symbol groups are one-to-one mapped to PRE sets of the M RE sets. One blind detection for the first signaling is performed on the PRE sets. Modulation symbols obtained by modulating the bits in a first bit sequence constitute a first modulation symbol set sequentially. The bits in the first bit sequence are sequentially arranged according to an output of a channel encoder. The first modulation symbol set is successively divided into the P modulation symbol groups, each consisting of X modulation symbols.