Dual Watch Subscriber Unit Short Data Transmission During Active Call

Resolve Bottlenecks,
Find Innovative SolutionsGenerate Solutions

Solution Overview

Problem

In wireless communication systems, particularly in LMR systems, the transmission of short data during active calls is impaired, leading to a starvation of updated data for infrastructure applications and dispatchers, which can have negative consequences, especially in first responder communications.

Innovation Solution

A dual watch subscriber unit is equipped with a transceiver having at least one transmitter and two receivers, allowing it to transmit short data on an inbound data channel while simultaneously receiving missed communication media on a separate outbound channel, ensuring continuous data transmission without interrupting active calls.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Productivity

If a subscriber unit transmits short data on an inbound data channel during an active call, then short data transmission is enabled, but the subscriber unit cannot receive outbound communication media on the same channel

Engineering Contradiction:

Improveshort data transmission capabilityVSAvoidmissed communication media

Core Design Contradiction:

ProductivityVSLoss of information

Solution Approach 1:

The subscriber unit is divided into multiple functional receivers: a first receiver dedicated to receiving outbound communication media during active calls, and a second receiver for receiving inbound data channels. This segmentation allows simultaneous operation of data transmission and call reception without interference, resolving the contradiction between enabling short data transmission and preventing loss of communication media.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The solution introduces a frequency dimension by using separate inbound and outbound traffic frequencies. The subscriber unit can transmit short data on an inbound data channel of one frequency while simultaneously receiving outbound communication media on a different frequency, effectively adding a spectral dimension to resolve the time-multiplexing conflict.

Inventive Principle:

Principle #17Another dimension (Dimensionality change)

2Device complexity

If the subscriber unit uses a single receiver for both inbound and outbound channels, then device complexity is reduced, but it cannot transmit short data during active calls without missing communication media

Engineering Contradiction:

Improvereceiver configurationVSAvoidshort data transmission during active call

Core Design Contradiction:

Device complexityVSProductivity

Solution Approach 1:

The receiver functionality is segmented into distinct units: a first receiver for outbound communication media and a second receiver for inbound data channels. This segmentation enables the subscriber unit to maintain full duplex operation during active calls while transmitting short data, resolving the contradiction between device simplicity and transmission capability.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The subscriber unit achieves multi-functionality by equipping it with multiple receivers that can operate simultaneously on different frequencies. This allows the single subscriber unit to perform both active call reception and short data transmission without requiring external辅助设备, balancing device complexity with enhanced functionality.

Inventive Principle:

Principle #6Universality (Multi-functionality)

3Reliability

If the subscriber unit transmits short data periodically during active calls, then infrastructure applications receive timely updates, but the transmission may interrupt outbound communication media reception

Engineering Contradiction:

Improvedata update timelinessVSAvoidmissed outbound communication media

Core Design Contradiction:

ReliabilityVSLoss of information

Solution Approach 1:

The communication functions are segmented into separate receivers: the first receiver continuously monitors outbound communication media during active calls, while the second receiver handles inbound data channel transmissions. This segmentation ensures that periodic short data transmissions do not interrupt outbound media reception, maintaining both data timeliness and call integrity.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The first receiver maintains continuous reception of outbound communication media throughout the active call, regardless of when short data is transmitted on the inbound channel. This continuity ensures that no communication media is missed, while the periodic short data transmissions still provide timely updates to infrastructure applications.

Inventive Principle:

Principle #20Continuity of useful action

Data Source

PatentUS10111058B2Method, device, and system for transmitting short data during an active call by a dual watch subscriber unit

Publication Date: 2018.10.23 MOTOROLA SOLUTIONS INC

AI summary

A dual watch subscriber unit (SU) in a wireless communication system transmits short data during an active call in response to a request to transmit short data. The SU transmits, via a transceiver at the SU, pending short data on an inbound data channel of an inbound traffic frequency. One of prior to or after transmitting the short data, the SU substantially simultaneously receives: via a first receiver of the transceiver, missed communication media of the active call missed during transmitting of the pending short data on a first outbound channel of a first outbound traffic frequency; and via a second receiver of the transceiver, second communication media of the active call, transmitted prior to or after the missed communication media of the active call, on a second outbound channel of a second outbound traffic frequency. The SU then plays back media from the missed and second communication media.