Distributed Control Channel Architecture for Wireless Data Reception

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Solution Overview

Problem

Conventional wireless communication systems transmit control information within the same subframe as data, which can lead to inefficiencies and errors, especially in environments where typical cellular backhaul resources are not available, such as in femtocell deployments.

Innovation Solution

Control information is distributed across multiple subframes, with portions transmitted over separate physical control channels in different subframes, allowing a mobile wireless communication device to reconstruct the necessary control information for data reception.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If control information is transmitted in the same subframe as data, then transmission timing is simplified and device complexity is reduced, but reliability and accuracy of data reception deteriorate due to potential errors and inefficiencies

Engineering Contradiction:

Improvereliability of data receptionVSAvoidcomplexity of control information transmission

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The control information is segmented and distributed across multiple subframes instead of being transmitted in a single subframe. This segmentation improves reliability by providing redundancy and error correction opportunities, while the systematic distribution pattern manages the complexity through structured implementation.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

Control information is transmitted in advance across multiple subframes before the actual data transmission. This preliminary action allows the receiving device to prepare for data reception with complete and verified control information, improving reliability by ensuring all control parameters are received and validated before data processing begins.

Inventive Principle:

Principle #10Preliminary action

2Measurement precision

If control information is distributed over multiple subframes, then reliability and accuracy of data reception are improved, but transmission complexity and processing requirements increase

Engineering Contradiction:

Improveaccuracy of control information receptionVSAvoidcomplexity of control information reconstruction

Core Design Contradiction:

Measurement precisionVSDevice complexity

Solution Approach 1:

The system employs feedback mechanisms where the receiving device acknowledges receipt of control information segments and requests retransmission if necessary. This feedback loop ensures high accuracy of control information reception while managing reconstruction complexity through systematic error handling and verification protocols.

Inventive Principle:

Principle #23Feedback

Solution Approach 2:

The transmission parameters for control information are optimized across different subframes, including modulation schemes, coding rates, and resource allocation. By adapting parameters based on channel conditions and segment importance, the system achieves high accuracy in control information reception while controlling the complexity of reconstruction through standardized parameter sets.

Inventive Principle:

Principle #35Parameter changes

3Loss of time

If control information is transmitted in the same subframe as data, then transmission time is reduced, but error rate increases due to resource constraints and interference

Engineering Contradiction:

Improvetime for control information transmissionVSAvoiderror rate of control information

Core Design Contradiction:

Loss of timeVSReliability

Solution Approach 1:

Control information is transmitted periodically across multiple subframes in a structured sequence. This periodic distribution spreads the transmission over time, reducing the error rate by avoiding resource constraints and interference that would affect a single concentrated transmission, while the periodic pattern maintains efficient timing through predictable intervals.

Inventive Principle:

Principle #19Periodic action

Solution Approach 2:

Redundant control information segments are transmitted in advance across multiple subframes to cushion against potential transmission errors. This prior cushioning ensures that even if some segments are corrupted or lost, the complete control information can be reconstructed from remaining segments, thereby reducing the error rate while managing transmission time through efficient redundancy.

Inventive Principle:

Principle #11Beforehand cushioning (Prior cushioning)

Data Source

PatentUS8995308B2Control channel architecture with control information distributed over multiple subframes

Publication Date: 2015.03.31 KYOCERA CORP

AI summary

Control information (126) related to the reception of data (128) within a subframe (116) is transmitted over multiple subframes (114, 116) by a base station (102). A controller (134) in a mobile wireless communication device (104) reconstructs the control information (126) received over multiple subframes (114, 116) based on at least some control information (130) in a first physical control channel (118) in a first sub-frame (114) and at least some other control information (132) in a second physical control channel (120) in a second subframe (116).