Scalable PTM Reception via Multi-Version Data Combining

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Solution Overview

Problem

In wireless communication systems, particularly those using W-CDMA, there are inefficiencies in point-to-multipoint (PTM) transmissions due to the use of a single, most robust modulation and coding scheme for all receiving devices, leading to unnecessary resource usage and delays, as devices with better channel conditions receive data unnecessarily robustly and may experience significant delays and wasted resources due to waiting for ACK or NACK before retransmitting.

Innovation Solution

The method involves encoding multiple versions of PTM data bits and transmitting location information for each version, allowing receiving devices to selectively choose and combine versions based on their individual channel conditions, thereby optimizing modulation and coding schemes for successful decoding while minimizing resource usage.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If a single most robust modulation and coding scheme is used for all receiving devices in PTM transmissions, then all devices can successfully decode the data, but devices with better channel conditions experience unnecessary resource usage and delays

Engineering Contradiction:

Improvedata decoding success rateVSAvoidtransmission delay

Core Design Contradiction:

ReliabilityVSLoss of time

Solution Approach 1:

The patent segments the single transmission stream into multiple versions with different modulation and coding schemes (MCS levels). Each receiving device can select the appropriate version based on its channel conditions, avoiding the need to wait for retransmissions and reducing processing delays while ensuring reliable decoding.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The patent introduces dynamic adaptability by providing multiple MCS versions (e.g., robust, intermediate, and less robust versions) of the same data. Receiving devices dynamically select the most suitable version based on their individual channel conditions, optimizing both reliability and transmission speed.

Inventive Principle:

Principle #15Dynamics

2Reliability

If a single most robust modulation and coding scheme is used for all receiving devices, then all devices can decode data reliably, but resource usage increases unnecessarily for devices with good channel conditions

Engineering Contradiction:

Improvedata decoding success rateVSAvoidprocessing energy consumption

Core Design Contradiction:

ReliabilityVSLoss of energy

Solution Approach 1:

The patent applies local quality by providing different MCS versions tailored to different receiving conditions. Devices with good channel conditions can select less robust versions requiring less processing energy, while devices with poor conditions use more robust versions, optimizing energy consumption locally at each device.

Inventive Principle:

Principle #3Local quality

Solution Approach 2:

The patent changes the MCS parameters (modulation order, coding rate) across different versions of the same data. This allows receiving devices to select versions with appropriate parameter complexity matching their channel conditions, reducing unnecessary processing energy consumption.

Inventive Principle:

Principle #35Parameter changes

3Productivity

If multiple versions of PTM data are transmitted with different modulation and coding schemes, then receiving devices can optimize resource usage, but device complexity increases

Engineering Contradiction:

Improvedata transmission efficiencyVSAvoidreceiving device processing complexity

Core Design Contradiction:

ProductivityVSDevice complexity

Solution Approach 1:

The patent implements partial action by providing multiple versions but allowing devices to selectively process only the version appropriate for their channel conditions. Devices don't need to process all versions, only the one matching their requirements, limiting the increase in processing complexity.

Inventive Principle:

Principle #16Partial or excessive action

4Reliability

If HARQ retransmission mechanisms are used with ACK/NACK signaling, then error detection and retransmission are ensured, but significant delays occur due to waiting for ACK or NACK

Engineering Contradiction:

Improveerror detection and retransmissionVSAvoidretransmission delay

Core Design Contradiction:

ReliabilityVSLoss of time

Solution Approach 1:

The patent applies preliminary action by pre-transmitting multiple versions with different MCS levels before any potential retransmission is needed. Receiving devices can immediately select and decode the appropriate version without waiting for ACK/NACK signaling, eliminating retransmission delays while maintaining error detection capabilities.

Inventive Principle:

Principle #10Preliminary action

Data Source

PatentUS8532012B2Methods and devices for scalable reception in wireless communication systems

Publication Date: 2013.09.10 IND TECH RES INST

AI summary

Methods and apparatuses for reception of point-to-multipoint (PTM) transmissions in a wireless communication system including a set of receiving devices. The method includes receiving location information respectively associated with each of a plurality of PTM data versions, and retrieving the plurality of PTM data versions using the location information. The method also includes combining the retrieved plurality of PTM data versions to generate a combined PTM data version, and decoding the combined PTM data version.