Prior art — US Patent 11516694

To identify the most relevant prior art for US patent 11516694, I will analyze the patents cited within its "Patent Citations" section, excluding those that are part of the same patent family and share the same priority date (July 24, 2012). For each relevant citation, I will provide the full citation, the earliest effective date for prior art purposes, a brief description, and an assessment of which claims it potentially anticipates under 35 U.S.C. § 102.

The following patents are excluded from the prior art analysis as they are direct ancestors or siblings sharing the same priority date (July 24, 2012) as US11516694B1, meaning they are not prior art in the traditional sense under 35 U.S.C. § 102:

US9215726B1 (continuation of 13/948,081)
US9578540B1 (continuation of 14/664,255)
US10959123B1 (continuation of 15/436,779)

Below is an analysis of the remaining cited prior art from US11516694B1.

Identified Prior Art and Anticipation Analysis

1. US6104712A

Full Citation: US6104712A, Robert; Bruno G., "Wireless communication network including plural migratory access nodes", Issued: August 15, 2000.
Earliest Effective Date: Priority Date: February 22, 1999.
Brief Description: This patent describes a wireless communication network that includes multiple migratory access nodes. It focuses on handoff management and routing of calls between fixed and mobile nodes, including mechanisms for registering mobile nodes and forwarding calls based on their location. It mentions managing quality of service (QoS) for real-time and non-real-time calls.
Potential Anticipation (35 U.S.C. § 102): This patent primarily addresses network architecture, mobility, and QoS in a wireless network. It does not appear to teach the specific elements of encoding a message into a smaller format to effect message latency for ionospheric HF transmission, nor does it explicitly disclose determining transmission parameters based on both message latency and a predefined channel bandwidth for such transmissions. Therefore, it is unlikely to directly anticipate the independent claims (1, 8, 13) of US11516694B1 in their entirety.

2. US20020198657A1

Full Citation: US20020198657A1, Robbins James E., "GPS correction methods, apparatus and signals", Published: December 26, 2002.
Earliest Effective Date: Priority Date: December 15, 2000.
Brief Description: This application details methods, apparatus, and signals for providing GPS correction data to GPS receivers. It describes transmitting correction data via various means, including wireless communication systems, to improve the accuracy of GPS positioning. It focuses on the data content and transmission methods for GPS corrections, which are typically small, highly time-sensitive messages.
Potential Anticipation (35 U.S.C. § 102): While GPS correction data involves small, time-sensitive messages, this patent focuses on the content and delivery of that specific type of data. It does not disclose the generalized concept of encoding any particular message to reduce its size for low-latency transmission, determining transmission parameters based on both message latency and a predefined channel bandwidth, or the specific use of ionospheric HF frequency bands for this purpose. Thus, it is unlikely to anticipate claims 1, 8, or 13.

3. US20020184645A1

Full Citation: US20020184645A1, Austin Phillip G., "Measurement of quality of service", Published: December 5, 2002.
Earliest Effective Date: Priority Date: May 30, 2001.
Brief Description: This publication relates to measuring Quality of Service (QoS) in a communication system, particularly focusing on methods to determine performance metrics like throughput and latency. It describes injecting test messages into a network and measuring the time taken for them to traverse the system to determine latency.
Potential Anticipation (35 U.S.C. § 102): This patent addresses the measurement and monitoring of QoS, including latency, rather than a method or device for actively reducing message latency through specific encoding and adaptive transmission parameter determination in an ionospheric HF context. It does not teach the specific encoding of a message into a smaller format, or the use of message latency and channel bandwidth to determine transmission parameters for ionospheric HF transmission as claimed in US11516694B1.

4. US20030012153A1

Full Citation: US20030012153A1, Fm Bay, "System and method for individualized broadcasts on a general use broadcast frequency", Published: January 16, 2003.
Earliest Effective Date: Priority Date: July 16, 2001.
Brief Description: This application describes systems and methods for transmitting individualized broadcasts over a general-use broadcast frequency. It involves encoding individual messages with unique identifiers and using techniques to allow recipients to selectively receive and decode only messages intended for them. It might involve efficient data transmission but does not focus on latency reduction via message size encoding or adaptive HF ionospheric parameters.
Potential Anticipation (35 U.S.C. § 102): This reference is concerned with individualized broadcasting and selective reception. While it involves encoding, it doesn't describe encoding to effect message latency by reducing message size for HF ionospheric transmission, nor does it disclose determining transmission parameters based on message latency and a predefined channel bandwidth, as central to claims 1, 8, and 13 of US11516694B1.

5. US20030126545A1

Full Citation: US20030126545A1, Tan Alfred Keng Tiong, "Non-linear code-division multiple access technology with improved detection algorithms and error correction coding", Published: July 3, 2003.
Earliest Effective Date: Priority Date: October 5, 2001.
Brief Description: This patent application describes non-linear code-division multiple access (CDMA) technology, including improved detection algorithms and error correction coding. It aims to enhance spectral efficiency and performance in CDMA systems, which might implicitly impact latency by improving reliability or data rates.
Potential Anticipation (35 U.S.C. § 102): This prior art focuses on CDMA technology, detection algorithms, and error correction coding to improve spectral efficiency and performance. While error correction coding can impact overall data delivery time (and thus perceived latency), US11516694B1 explicitly avoids such coding for low latency, instead focusing on message size reduction and parameter determination. Therefore, this reference does not anticipate the core aspects of claims 1, 8, or 13, particularly the encoding for message size latency reduction and the adaptive parameter determination based on latency and bandwidth for ionospheric HF.

6. US20030072467A1

Full Citation: US20030072467A1, Brundage Trent J., "Progressive watermark decoding on a distributed computing platform", Published: April 17, 2003.
Earliest Effective Date: Priority Date: October 16, 2001.
Brief Description: This application describes a system for progressively decoding watermarks on a distributed computing platform. It is related to digital rights management and data integrity, not directly to low-latency message transmission in wireless communication systems.
Potential Anticipation (35 U.S.C. § 102): This patent is unrelated to wireless message transmission for low latency and does not disclose any elements of claims 1, 8, or 13 of US11516694B1.

7. US20080129591A1

Full Citation: US20080129591A1, Lamance James, "System and Method for Providing Assistance Data Within a Location Network", Published: June 5, 2008.
Earliest Effective Date: Priority Date: August 5, 2003.
Brief Description: This patent describes providing assistance data, such as GPS correction data or cellular network information, within a location network. It focuses on how mobile devices request and receive this assistance data to improve their positioning capabilities. The transmission of this data may involve wireless links.
Potential Anticipation (35 U.S.C. § 102): Similar to US20020198657A1, this patent focuses on specific types of assistance data in a location network. It does not teach the general encoding of messages for low latency by reducing message size, nor the determination of transmission parameters based on message latency and predefined channel bandwidth, specifically for ionospheric HF. It does not anticipate claims 1, 8, or 13.

8. US8654815B1

Full Citation: US8654815B1, Rearden, Llc, "System and method for distributed antenna wireless communications", Issued: February 18, 2014.
Earliest Effective Date: Priority Date: April 2, 2004.
Brief Description: This patent describes systems and methods for distributed antenna wireless communications, focusing on improving coverage and capacity within a wireless network by using multiple antennas spread throughout a geographic area. It addresses signal transmission and reception in such environments.
Potential Anticipation (35 U.S.C. § 102): This patent relates to distributed antenna systems for improving wireless communication infrastructure. It does not address the core inventive concept of US11516694B1, which is low-latency ionospheric HF messaging achieved through message encoding and adaptive parameter determination based on latency and channel bandwidth. It does not anticipate claims 1, 8, or 13.

9. US8542763B2

Full Citation: US8542763B2, Rearden, Llc, "Systems and methods to coordinate transmissions in distributed wireless systems via user clustering", Issued: September 24, 2013.
Earliest Effective Date: Priority Date: April 2, 2004.
Brief Description: This patent describes coordinating transmissions in distributed wireless systems, often involving user clustering, to optimize resource allocation and minimize interference. It focuses on managing wireless resources efficiently.
Potential Anticipation (35 U.S.C. § 102): This patent is concerned with resource coordination and user clustering in distributed wireless systems, aiming for efficient resource usage. It does not teach the specific low-latency messaging techniques of US11516694B1, particularly the message encoding for size reduction and the adaptive parameter determination for ionospheric HF transmission. It does not anticipate claims 1, 8, or 13.

10. US20050283715A1

Full Citation: US20050283715A1, Sutivong Arak, "Robust erasure detection and erasure-rate-based closed loop power control", Published: December 22, 2005.
Earliest Effective Date: Priority Date: June 18, 2004.
Brief Description: This application describes techniques for robust erasure detection and erasure-rate-based closed-loop power control in wireless communication systems. It aims to improve reliability and efficiency by adaptively adjusting transmission power based on channel conditions and detected erasures.
Potential Anticipation (35 U.S.C. § 102): This patent deals with power control and error detection to improve robustness in wireless communications. While it mentions adaptive power control, it does not link it to the specific goal of minimizing message latency through message encoding and considering both message latency and predefined channel bandwidth, especially in the context of ionospheric HF transmission as described in US11516694B1. Therefore, it does not anticipate claims 1, 8, or 13.

11. US20070147251A1

Full Citation: US20070147251A1, Monsen Peter, "Technique for adaptive data rate communication over fading dispersive channels", Published: June 28, 2007.
Earliest Effective Date: Priority Date: September 23, 2005.
Brief Description: This application describes an adaptive data rate communication technique designed for fading dispersive channels. It focuses on adjusting data rates and possibly other parameters to maintain reliable communication in challenging wireless environments, potentially including HF channels.
Potential Anticipation (35 U.S.C. § 102): This patent introduces adaptive data rate communication for fading channels, which is relevant to wireless communication efficiency. While it relates to adapting transmission parameters, it does not specifically teach encoding a message to reduce its size for low latency, or determining transmission parameters based on both message latency and a predefined channel bandwidth for ionospheric HF transmission in the manner claimed by US11516694B1. Therefore, it does not directly anticipate claims 1, 8, or 13.

12. US20080002882A1

Full Citation: US20080002882A1, Voloshynovskyy Svyatoslav, "Brand protection and product autentication using portable devices", Published: January 3, 2008.
Earliest Effective Date: Priority Date: June 30, 2006.
Brief Description: This application concerns brand protection and product authentication using portable devices, involving techniques like watermarking or unique identifiers. It is unrelated to low-latency wireless messaging for general data or financial transactions.
Potential Anticipation (35 U.S.C. § 102): This patent is unrelated to the subject matter of US11516694B1 and does not anticipate any of its claims.

13. US20080161050A1

Full Citation: US20080161050A1, Shudark Jeffrey B, "Method for configuring a wireless communication device to operate in a wireless communication system through automatic SIM pairing and associated wireless communication device", Published: July 3, 2008.
Earliest Effective Date: Priority Date: December 29, 2006.
Brief Description: This patent describes methods and devices for configuring wireless communication devices through automatic SIM pairing within a wireless communication system. It focuses on device setup and network access.
Potential Anticipation (35 U.S.C. § 102): This patent relates to device configuration and network access. It does not teach the specific low-latency message encoding or adaptive transmission parameter determination for ionospheric HF as claimed in US11516694B1. It does not anticipate claims 1, 8, or 13.

14. US20090074155A1

Full Citation: US20090074155A1, Wang Jin, "Methods and apparatus to test a subscriber line for a broadband access service", Published: March 19, 2009.
Earliest Effective Date: Priority Date: September 19, 2007.
Brief Description: This application describes methods and apparatus for testing subscriber lines in broadband access services. It focuses on diagnostic procedures for network infrastructure.
Potential Anticipation (35 U.S.C. § 102): This patent is directed to testing broadband subscriber lines, which is unrelated to the low-latency wireless messaging aspects of US11516694B1. It does not anticipate claims 1, 8, or 13.

15. US20100245172A1

Full Citation: US20100245172A1, Thales Alenia Space Italia S.P.A, "Method of Synchronising Nodes of a Network, and System and Device Therefor", Published: September 30, 2010.
Earliest Effective Date: Priority Date: December 18, 2007.
Brief Description: This patent application describes methods and systems for synchronizing nodes in a communication network, particularly relevant for satellite communication systems. Accurate synchronization can be critical for efficient and reliable data transfer.
Potential Anticipation (35 U.S.C. § 102): While network synchronization is important for communication, this patent does not teach the specific message encoding for low latency or the adaptive determination of transmission parameters based on message latency and predefined channel bandwidth, especially in the context of ionospheric HF, as claimed in US11516694B1. It does not anticipate claims 1, 8, or 13.

16. US20130132795A1

Full Citation: US20130132795A1, Kabushiki Kaisha Toshiba, "Semiconductor storage device, method of controlling the same, and error correction system", Published: May 23, 2013.
Earliest Effective Date: Priority Date: February 29, 2008.
Brief Description: This patent relates to semiconductor storage devices and associated error correction systems. It focuses on data reliability within memory systems.
Potential Anticipation (35 U.S.C. § 102): This patent is unrelated to wireless communication and low-latency messaging, specifically not addressing ionospheric HF transmission or the claimed encoding and parameter determination methods. It does not anticipate claims 1, 8, or 13.

17. US20090300469A1

Full Citation: US20090300469A1, Broadcom Corporation, "System and method for inter-packet channel coding and decoding", Published: December 3, 2009.
Earliest Effective Date: Priority Date: May 29, 2008.
Brief Description: This application describes systems and methods for inter-packet channel coding and decoding, which are techniques used to improve the robustness of data transmission by adding redundancy across multiple packets.
Potential Anticipation (35 U.S.C. § 102): This patent focuses on channel coding and decoding for error correction, which generally increases message size for reliability, rather than reducing it for latency as in US11516694B1. While it relates to wireless transmission, it does not teach the specific encoding to effect message latency by reducing size, or the determination of parameters based on latency and predefined channel bandwidth for ionospheric HF transmission. It does not anticipate claims 1, 8, or 13.

18. US20120201192A1

Full Citation: US20120201192A1, Pantech Co., Ltd., "Method and apparatus for relaying uplink signals", Published: August 9, 2012.
Earliest Effective Date: Priority Date: October 6, 2009.
Brief Description: This application describes methods and apparatus for relaying uplink signals in wireless communication systems, aiming to improve coverage and signal quality for mobile stations.
Potential Anticipation (35 U.S.C. § 102): This patent is concerned with relaying uplink signals to improve coverage. It does not teach encoding messages for low latency by reducing message size, nor does it address the determination of transmission parameters based on both message latency and a predefined channel bandwidth for ionospheric HF transmission, as claimed in US11516694B1. It does not anticipate claims 1, 8, or 13.

19. US20130091214A1

Full Citation: US20130091214A1, Broadcom Corporation, "Media social network", Published: April 11, 2013.
Earliest Effective Date: Priority Date: October 8, 2011.
Brief Description: This patent describes a media social network, focusing on sharing and interacting with media content. It relates to social media platforms and content delivery, not low-latency wireless communication infrastructure or techniques.
Potential Anticipation (35 U.S.C. § 102): This patent is unrelated to the subject matter of US11516694B1 and does not anticipate any of its claims.

20. US20130132796A1

Full Citation: US20130132796A1, Broadcom Corporation, "Accelerated Cyclical Redundancy Check", Published: May 23, 2013.
Earliest Effective Date: Priority Date: November 21, 2011.
Brief Description: This application details methods and systems for accelerated Cyclical Redundancy Check (CRC), which is a technique for error detection in digital data. This typically involves adding check bits to a message.
Potential Anticipation (35 U.S.C. § 102): This patent concerns error detection, which involves adding bits to a message, thus increasing its size, rather than reducing it for low latency as taught by US11516694B1. It does not teach the specific encoding for message size latency reduction or adaptive parameter determination for ionospheric HF transmission. It does not anticipate claims 1, 8, or 13.

21. US20130283126A1

Full Citation: US20130283126A1, Freescale Semiconductor, Inc., "Error detection within a memory", Published: October 24, 2013.
Earliest Effective Date: Priority Date: April 20, 2012.
Brief Description: This patent describes methods and systems for error detection within a memory device. It is focused on data integrity within hardware components rather than wireless communication.
Potential Anticipation (35 U.S.C. § 102): This patent is unrelated to wireless communication and low-latency messaging, specifically not addressing ionospheric HF transmission or the claimed encoding and parameter determination methods. It does not anticipate claims 1, 8, or 13.

22. US20140281625A1

Full Citation: US20140281625A1, Seagatetechnology Llc, "Storing System Data During Low Power Mode Operation", Published: September 18, 2014.
Earliest Effective Date: Priority Date: March 15, 2013.
Brief Description: This patent describes methods and systems for storing system data during low-power mode operation, which relates to power management in computing devices.
Potential Anticipation (35 U.S.C. § 102): This patent is unrelated to wireless communication and low-latency messaging, specifically not addressing ionospheric HF transmission or the claimed encoding and parameter determination methods. It does not anticipate claims 1, 8, or 13.

Most Relevant Prior Art (Based on Analysis of Direct Citations):

Based on the analysis of the cited patents, none of the individual prior art references appear to fully anticipate the independent claims (1, 8, 13) of US11516694B1. The key inventive aspects of US11516694B1, such as encoding messages to reduce their size specifically to effect message latency, and determining transmission parameters based on both message latency and a predefined channel bandwidth for ionospheric HF frequency band transmission, are not fully disclosed in any single cited prior art. Many cited patents address general wireless communication, QoS, power control, or error correction, but not the specific combination and purpose outlined in US11516694B1.

However, if I were to highlight the most relevant in terms of the field of technology, references like US20070147251A1 ("Technique for adaptive data rate communication over fading dispersive channels") and US20050283715A1 ("Robust erasure detection and erasure-rate-based closed loop power control") are somewhat related in that they discuss adaptive transmission parameters or power control in challenging wireless environments, which might include HF. However, they lack the specific encoding for message size latency reduction and the explicit determination criteria (message latency and predefined channel bandwidth) for ionospheric HF transmissions central to US11516694B1.

The remaining cited prior art are either too general, relate to different communication aspects (e.g., GPS correction data, network synchronization, internal memory error detection), or are directly contradictory to the low-latency approach (e.g., focusing on error correction/redundancy which increases message size).