Shared Traffic Channel Broadcast Using PLCM and Walsh Code

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Solution Overview

Problem

Wireless communication systems face a challenge in efficiently providing broadcast and multicast services without dedicating resources, which reduces the availability of network resources for conventional voice and data services.

Innovation Solution

The technique involves sharing existing Forward Packet Data channels and Forward Supplemental channels to transmit broadcast and multicast data, using a shared public long code mask and Walsh Code, and addressing specific mobile stations or groups through unique identifiers within the shared traffic channel.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If dedicated channels are used for broadcast services, then broadcast service quality is improved, but network resource availability for voice and data services deteriorates

Engineering Contradiction:

Improvebroadcast service qualityVSAvoidnetwork resource availability

Core Design Contradiction:

ReliabilityVSQuantity of substance

Solution Approach 1:

The patent applies universality by enabling existing traffic channels (F-PDCH and F-SCH) to serve dual purposes: carrying both conventional voice/data traffic and broadcast/multicast services simultaneously. This eliminates the need for dedicated broadcast channels while maintaining service quality through shared resource utilization.

Inventive Principle:

Principle #6Universality (Multi-functionality)

Solution Approach 2:

The patent merges broadcast traffic with conventional voice and data traffic on the same shared traffic channels. By combining multiple traffic types on common resources rather than separating them into dedicated channels, the system maintains broadcast service quality without reducing overall network resource availability.

Inventive Principle:

Principle #5Merging (Combining)

2Quantity of substance

If shared traffic channels are used for broadcast services, then network resource availability is improved, but broadcast service complexity increases

Engineering Contradiction:

Improvenetwork resource availabilityVSAvoidchannel sharing complexity

Core Design Contradiction:

Quantity of substanceVSDevice complexity

Solution Approach 1:

The patent segments broadcast traffic into control messages and data packets that are interleaved with conventional traffic on shared channels. Mobile stations segment their reception by monitoring for specific broadcast indicators while simultaneously receiving voice/data, managing complexity through structured segmentation rather than monolithic channel sharing.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The patent introduces intermediary elements such as broadcast indicators and control messages that mediate between broadcast services and shared traffic channels. These intermediaries enable mobile stations to distinguish broadcast content from conventional traffic without requiring complex channel separation, reducing overall system complexity.

Inventive Principle:

Principle #24Intermediary (Mediator)

Data Source

PatentUS7813746B2Wireless network using shared traffic channel mode of operation for broadcast services

Publication Date: 2010.10.12 UERAN TECHNOLOGY LLC

AI summary

A wireless network base station for transmitting broadcast data to a plurality of mobile stations in a coverage area of the base station. The base station transmits a first control message to the mobile stations that assigns a shared public long code mask (PLCM) to the mobile stations. The base station also transmits a second control message to the mobile stations that assigns a shared Walsh Code (WC) to the mobile stations. Thereafter, the base station transmits the broadcast data to the mobile stations using the shared PLCM and the shared WC.