Uplink Control Channel Orthogonal Code Multiplication

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Solution Overview

Problem

In current mobile communication systems, sharing resources among multiple user apparatuses using FDM or CDM schemes leads to reduced orthogonal code sequences, increased interference, and frequent modifications in transmission bands, affecting signal quality and efficiency.

Innovation Solution

A user apparatus transmits uplink control channels using a single-carrier scheme with a predefined dedicated band, employing orthogonal code sequences multiplied by a uniform factor, allowing for better orthogonality and reduced band variations, and utilizing CAZAC codes for channel estimation and differentiation among users.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If FDM or CDM schemes are used to share resources among multiple user apparatuses, then resource sharing capability is improved, but the number of orthogonal code sequences is reduced and interference is increased

Engineering Contradiction:

Improveresource sharing capabilityVSAvoidsignal quality

Core Design Contradiction:

Adaptability or versatilityVSReliability

Solution Approach 1:

The patent introduces a new dimension for resource sharing by allowing dynamic allocation of both time and frequency resources to uplink control channels, rather than relying solely on code division multiplexing. This dimensional expansion enables multiple users to share resources without compromising orthogonal code availability, as each user can be assigned unique time-frequency positions in addition to orthogonal codes.

Inventive Principle:

Principle #17Another dimension (Dimensionality change)

Solution Approach 2:

The patent implements dynamic resource allocation where the base station can flexibly assign time-frequency resources to uplink control channels based on current system conditions, user priorities, and interference levels. This dynamic approach allows the system to adapt to changing conditions while maintaining sufficient orthogonal codes for user differentiation, thereby improving both resource sharing capability and signal quality.

Inventive Principle:

Principle #15Dynamics

2Adaptability or versatility

If FDM or CDM schemes are used to share resources among multiple user apparatuses, then resource sharing capability is improved, but band variations are increased

Engineering Contradiction:

Improveresource sharing capabilityVSAvoidtransmission band stability

Core Design Contradiction:

Adaptability or versatilityVSStability of the object's composition

Solution Approach 1:

The patent segments the uplink control channel resources into distinct time-frequency blocks, where each user apparatus is assigned specific segments. This segmentation allows for stable band allocation within each segment while enabling overall resource sharing across different segments. The orthogonal codes are applied within these segmented resources, maintaining both stability and adaptability.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The patent applies different resource allocation strategies to different local regions of the time-frequency spectrum. Certain frequency bands or time periods may be designated for specific users or control channel types, allowing local optimization of band stability while maintaining global resource sharing capability. This local quality approach ensures that critical control channels experience minimal band variations.

Inventive Principle:

Principle #3Local quality

3Adaptability or versatility

If orthogonal code sequences are reduced to enable resource sharing, then resource sharing capability is improved, but the ability to differentiate among users is reduced

Engineering Contradiction:

Improveresource sharing capabilityVSAvoiduser differentiation capability

Core Design Contradiction:

Adaptability or versatilityVSMeasurement precision

Solution Approach 1:

The patent merges multiple differentiation mechanisms: orthogonal codes, time-frequency resource positions, and cyclic shifts. Instead of relying solely on orthogonal codes for user differentiation, the system combines these elements to create a multi-dimensional user identification scheme. This merging allows fewer orthogonal codes to support more users while maintaining precise user differentiation through the combination of multiple parameters.

Inventive Principle:

Principle #5Merging (Combining)

Solution Approach 2:

The patent creates a composite user identification structure by combining orthogonal codes with time-frequency resource assignments and cyclic shift parameters. This composite approach is analogous to creating composite materials with enhanced properties - the combination of multiple simpler elements (codes, positions, shifts) creates a more powerful user differentiation mechanism than any single element alone, enabling both resource sharing and precise user identification.

Inventive Principle:

Principle #40Composite materials

Data Source

PatentUS8873499B2User apparatus, base station apparatus, and method

Publication Date: 2014.10.28 NTT DOCOMO INC

AI summary

A user apparatus generates an uplink control channel including at least one of acknowledgement information and channel condition information on an downlink, and transmits the uplink control channel in a predefined dedicated band if no resource is assigned to transmit an uplink data channel. The uplink control channel includes multiple unit block sequences resulting from multiplication of the same factor with all chips of a CAZAC code sequence for the user apparatus.