Back Channel Communication in Connectionless Bluetooth Scanners
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Solution Overview
Problem
Current Bluetooth and Bluetooth Low Energy (BLE) systems lack back channel communication from scanners to broadcasting devices in a connectionless mode, which limits the number of devices that can communicate and requires resource-intensive connection setup procedures.
Innovation Solution
Implementing a method for back channel communication between scanners and broadcasting devices in a connectionless mode using Bluetooth Low Energy periodic advertising and Connectionless Slave Broadcast (CSB) protocols, allowing scanners to send packets without establishing a point-to-point asynchronous connection, and using contention-based communication with acknowledgment and negative acknowledgment messages.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If connectionless mode broadcasting is used to allow unlimited scanners to receive messages, then the number of communicating devices is improved, but back channel communication capability deteriorates
Solution Approach 1:
The patent segments the communication channel into two distinct directions: forward channel for broadcasting from the broadcasting device to multiple scanners, and back channel for responses from scanners to the broadcasting device. This segmentation allows the system to maintain unlimited scanner connectivity while enabling selective back channel communication through dedicated response slots and addressing mechanisms.
Solution Approach 2:
The patent introduces an intermediary addressing mechanism using scanner addresses embedded in back channel packets. This intermediary allows the broadcasting device to identify and communicate with specific scanners among many connected devices without requiring point-to-point connections, thus enabling back channel communication while maintaining connectionless mode scalability.
2Reliability
If point-to-point ACL connection is established for back channel communication, then communication reliability is improved, but resource consumption and complexity worsen
Solution Approach 1:
The patent performs preliminary actions by establishing the back channel communication framework in advance during the connectionless advertising setup phase. The broadcasting device pre-configures response slots and address recognition mechanisms, so that when scanners need to communicate back, the pathway is already prepared and recognized, eliminating the need for runtime connection establishment procedures.
Solution Approach 2:
The patent enables scanners to self-identify and self-address using their unique scanner addresses included in their back channel packets. The broadcasting device automatically routes responses based on these addresses without requiring manual connection setup or pairing procedures, thus achieving reliable communication while minimizing device complexity and resource consumption.
3Stability of the object's composition
If connection setup procedure is initiated for back channel communication, then communication stability is improved, but communication speed and efficiency deteriorate
Solution Approach 1:
The patent maintains continuity of useful action by keeping the back channel communication pathway continuously available within the connectionless advertising structure. Scanners can immediately transmit back channel packets in preallocated response slots without interruption or setup delays, ensuring both stability through structured communication and high speed through eliminated connection establishment overhead.
Data Source
AI summary
A method for communication by a scanner is described. The method includes receiving a broadcast message from a broadcasting device in a connectionless mode. The method also includes performing back channel communication with the broadcasting device on a contention basis while maintaining the connectionless mode. The scanner may send a packet to the broadcasting device while maintaining a connectionless relationship with the broadcasting device.