US 7894385

Here's a concise summary of US Patent 7894385:

US Patent 7894385 Summary

• Title: Mobility extensions for wireless multiple radio mesh [cite: "Title: Mobility extensions for wireless multiple radio mesh"]
• Current Assignee: Dynamic Mesh Networks Inc [cite: "Current Assignee Dynamic Mesh Networks Inc"]
• Inventors: Francis daCosta, Sriram Dayanandan [cite: "Inventor Francis daCosta Sriram Dayanandan"]
• Filing Date: June 15, 2007 [cite: "Filing date 2007-06-15"]
• Issue Date: February 22, 2011 [cite: "Publication date 2011-02-22"]
• Abstract: The patent describes extending multi-radio backhaul functionality to mobile applications. It involves a mobile mesh node scanning or sampling multiple radio channels to identify the best parent mesh node for connection. The techniques outlined aim to perform this scanning/sampling without degrading the overall performance or "up time" of the mobile mesh unit's network. [cite: "Abstract The functionality of multiple radio backhaul is extended to mobility applications. The multiple radio backhaul uses at least one radio for the uplink and at least one radio for the downlink, both operating in different, non-interfering channels. A mobile mesh node scans and/or samples multiple radio channels to determine the best parent mesh node to connect to. Techniques devised to scan/sample the external Radio Frequency (RF) environment without sacrificing the overall up time performance of the network are described."]

Plain-Language Overview of Independent Claims:

• Claim 1 (Method for operating a mesh network): This claim describes a method where a mobile mesh node, equipped with a dedicated scanning radio and at least two relay radios (all operating on different, non-interfering channels), uses the scanning radio for initial discovery of potential new parent nodes. When the node is moving rapidly, an uplink relay radio then performs the actual sampling of these discovered potential parents. To prevent data loss during sampling, the current parent node buffers packets destined for the mobile node, and the mobile node buffers packets intended for its current parent. To manage this process efficiently, a common current parent node coordinates sampling times by sending tokens to its child nodes in a round-robin fashion. [cite: "1. A method for operating a mesh network having a plurality of mesh nodes, comprising: for at least one mesh node of the mesh network, scanning a Radio Frequency (RF) environment using a dedicated scanning radio to determine a new potential parent mesh node for connecting with said at least one mesh node; wherein said at least one mesh node includes, in addition to said scanning radio, at least two relay radios in each mesh element and wherein said scanning radio and said at least two relay radios operate on different non-interfering channels; wherein said at least one mesh node is moving sufficiently rapidly that it may lose connectivity with its current parent mesh node, and wherein said dedicated scanning radio is utilized for discovery of potential new parent nodes and sampling of discovered potential new parent nodes is performed by an uplink relay radio of said at least one mesh node; wherein while said at least one mesh node samples potential new parent nodes, packets to be sent to said at least one mesh node from its current parent node are buffered by the current parent node, and packets to be sent from said at least one mesh node to its current parent are buffered by said at least one mesh node; and wherein sampling times are coordinated among multiple mesh nodes having a common current parent node whereby the common current parent node sends tokens to each of its children in a round-robin manner."]
• Claim 2 (Mesh network apparatus): This claim describes a mesh network system with a plurality of mesh nodes. At least one of these mesh nodes is designed to use a dedicated scanning radio to find new potential parent nodes. This node also includes at least two relay radios, with the scanning and relay radios operating on different, non-interfering channels. The system ensures that when the mesh node is sampling potential new parent nodes, packets are buffered by both the current parent node (for downlink traffic) and the mobile mesh node itself (for uplink traffic). Furthermore, sampling times are coordinated among child nodes sharing a common parent, with the parent sending tokens to its children in a round-robin manner. [cite: "2. A mesh network comprising: a plurality of mesh nodes; wherein at least one mesh node of the mesh network is configured to scan a Radio Frequency (RF) environment using a dedicated scanning radio to determine a new potential parent mesh node for connecting with said at least one mesh node; wherein said at least one mesh node includes, in addition to the scanning radio, at least two relay radios in each mesh element and wherein said scanning radio and said at least two relay radios operate on different non-interfering channels; wherein while said at least one mesh node samples potential new parent nodes, packets to be sent to said at least one mesh node from its current parent node are buffered by the current parent node, and packets to be sent from said at least one mesh node to its current parent are buffered by said at least one mesh node; wherein sampling times are coordinated among multiple mesh nodes having a common current parent node whereby the common current parent node sends tokens to each of its children in a round-robin manner."]
• Claim 3 (Mesh network apparatus with specific radio configuration): This claim focuses on a mesh network where each node has at least three distinct radios: a first relay radio for uplink connections to a current parent (on a first RF channel), a second relay radio for downlink connections to child nodes (on a second RF channel), and a dedicated scanning radio (on a third, different RF channel) for discovering new potential parent nodes. After the scanning radio identifies a potential new parent, the first relay radio (uplink) samples the link to this new parent. During this sampling, packets are buffered by both the current parent node and the mesh node. Similar to the other claims, sampling times are coordinated by the common parent node sending round-robin tokens to its children. [cite: "3. A mesh network comprising: a plurality of mesh nodes; wherein each node within said plurality of nodes comprises at least three radios further including: a first relay radio operating on a first RF channel at a first point in time and dedicated to uplink connections to a single current parent node; a second relay radio operating on a second RF channel at a first point in time and dedicated to downlink connections to zero or more child nodes; and a dedicated scanning radio operating on a third RF channel at a first point in time and configured to scan a Radio Frequency (RF) environment to discover new potential parent mesh nodes for connecting with said first relay radio; wherein said first, second, and third RF channels are different from each other wherein after said dedicated scanning radio discovers a potential new parent node, said first relay radio samples the RF link to said potential new parent node using its uplink radio and concurrent with said sampling, packets to be sent to the mesh node from its current parent node are buffered by the current parent node, and packets to be sent from the mesh node to its current parent node are buffered by the mesh node wherein sampling times are coordinated among multiple mesh nodes having a common current parent node whereby the common current parent node sends tokens to each of its children in a round-robin manner."]

CAFC 2026 Dockets:
As of April 26, 2026, a search for US patent 7894385 in CAFC 2026 dockets did not return any specific results directly mentioning this patent. The provided Google Patents page does indicate ongoing litigation in various District Courts and a PTAB case (IPR2025-01569, which was "Not Instituted - Procedural"), but no specific CAFC 2026 dockets for US7894385 were found. [cite: "US case filed in California Northern District Court litigation Critical https://portal.unifiedpatents.com/litigation/California%20Northern%20District%20Court/case/3%3A25-cv-06441 Source: District Court Jurisdiction: California Northern District Court "Unified Patents Litigation Data" by Unified Patents is licensed under a Creative Commons Attribution 4.0 International License.", "PTAB case IPR2025-01569 filed (Not Instituted - Procedural) litigation https://portal.unifiedpatents.com/ptab/case/IPR2025-01569 Petitioner: "Unified Patents PTAB Data" by Unified Patents is licensed under a Creative Commons Attribution 4.0 International License.", "US case filed in Texas Eastern District Court litigation https://portal.unifiedpatents.com/litigation/Texas%20Eastern%20District%20Court/case/2%3A25-cv-00781 Source: District Court Jurisdiction: Texas Eastern District Court "Unified Patents Litigation Data" by Unified Patents is licensed under a Creative Commons Attribution 4.0 International License.", "US case filed in Texas Eastern District Court litigation https://portal.unifiedpatents.com/litigation/Texas%20Eastern%20District%20Court/case/2%3A25-cv-00472 Source: District Court Jurisdiction: Texas Eastern District Court "Unified Patents Litigation Data" by Unified Patents is licensed under a Creative Commons Attribution 4.0 International License.", "US case filed in California Northern District Court litigation https://portal.unifiedpatents.com/litigation/California%20Northern%20District%20Court/case/5%3A25-cv-06441 Source: District Court Jurisdiction: California Northern District Court "Unified Patents Litigation Data" by Unified Commons Attribution 4.0 International License."]

Known litigation involving US patent 7894385 is as follows:

1. Case: Dynamic Mesh Networks, Inc. et al. v. Cisco Systems, Inc.

   • Jurisdiction: U.S. District Court for the Eastern District of Texas
   • Case Number: 2:25-cv-00781
   • Filing Date: August 12, 2025
   • Plaintiff(s): Dynamic Mesh Networks, Inc. et al.
   • Defendant(s): Cisco Systems, Inc.
   • Outcome/Current Status: Ongoing. As of September 18, 2025, Cisco Systems, Inc. had filed a response to the complaint, indicating the case is active in discovery phases.

2. Case: Declaratory Judgment Action (Plaintiff Unspecified) v. Dynamic Mesh Networks, Inc. (Defendant Unspecified)

   • Jurisdiction: U.S. District Court for the Northern District of California
   • Case Number: 3:25-cv-06441
   • Filing Date: 2025 (implied by case number "25-cv")
   • Plaintiff(s): Unspecified, but the case involves a "FIRST AMENDED COMPLAINT FOR DECLARATORY JUDGMENT OF NONINFRINGEMENT" of US7894385, among other patents. This typically indicates the plaintiff is seeking a declaration of non-infringement.
   • Defendant(s): Unspecified, but likely Dynamic Mesh Networks, Inc. as the patent owner.
   • Outcome/Current Status: Listed as "Active, critical" on Google Patents.

3. Case: Inter Partes Review (Petitioner Unspecified) against US7894385

   • Jurisdiction: Patent Trial and Appeal Board (PTAB)
   • Case Number: IPR2025-01569
   • Filing Date: 2025 (implied by case number "IPR2025-")
   • Plaintiff(s): Petitioner (unspecified)
   • Defendant(s): Dynamic Mesh Networks, Inc. (patent owner)
   • Outcome/Current Status: Not Instituted - Procedural.

4. Case: Dynamic Mesh Networks, Inc. et al. v. Cisco Systems, Inc.

   • Jurisdiction: U.S. District Court for the Eastern District of Texas
   • Case Number: 2:25-cv-00472
   • Filing Date: 2025 (implied by case number "25-cv")
   • Plaintiff(s): Dynamic Mesh Networks, Inc. et al.
   • Defendant(s): Cisco Systems, Inc.
   • Outcome/Current Status: As of July 31, 2025, there were party discussions regarding this litigation. No specific outcome or current status is explicitly stated beyond it being an active litigation.

5. Case: Dynamic Mesh Networks, Inc. et al. v. (Defendant Unspecified)

   • Jurisdiction: U.S. District Court for the Northern District of California
   • Case Number: 5:25-cv-06441
   • Filing Date: July 31, 2025
   • Plaintiff(s): Dynamic Mesh Networks, Inc. et al.
   • Defendant(s): Unspecified, but likely Cisco Systems, Inc. or a related entity given the context of other related cases.
   • Outcome/Current Status: Dismissed due to standing issues. Dynamic Mesh Networks, Inc. subsequently re-filed a similar case in the Eastern District of Texas (2:25-cv-00781) on August 12, 2025.

Proceedings overview

A single AIA trial proceeding, IPR2025-01569, has been filed against US Patent 7894385, and its institution was denied on discretionary grounds. This means the patent's claims have not been challenged on their merits at the PTAB, and thus, none have been invalidated or sustained by a PTAB Final Written Decision. For a defendant, this posture indicates that the patent's validity has not been tested in an inter partes review, leaving all claims available for assertion, but also open to future challenges.

IPR2025-01569 — Cisco Systems, Inc. v. Patent Owner Not Explicitly Stated

• Type: Inter Partes Review
• Filed: 2025-09-23
• Status: Discretionary Denial. This means the Patent Trial and Appeal Board (PTAB) declined to institute the review, and therefore, the validity of the challenged claims was not assessed on the merits. The proceeding was last modified on 2026-02-27.
• Judge panel: The specific panel of Administrative Patent Judges for this proceeding is not publicly available in the provided search results.
• Petition grounds: The detailed grounds (which claims, specific prior art, or statutory basis under § 102 / § 103 / § 112) for the petition are not available in the search results, as the review was denied on procedural, discretionary grounds rather than merits.
• Institution decision: Denied on 2026-02-27. The denial was discretionary, meaning the PTAB exercised its discretion not to proceed with the review. While the specific reasoning for IPR2025-01569 is not explicitly detailed in the provided search results, discretionary denials in 2025 frequently cited the "settled expectations" doctrine for older patents (US7894385 was granted in 2011), as well as other policy considerations such as parallel litigation or inconsistent claim constructions.
• Final Written Decision: Not issued, as institution was denied.
• Settlement / termination: Not applicable, as the proceeding was terminated by a discretionary denial of institution.
• Appeal: Not applicable, as institution was denied, and such denials are generally unappealable under 35 U.S.C. § 314(d).
• Defensive value: This proceeding did not result in the invalidation or narrowing of any claims of US7894385. The patent owner successfully avoided a PTAB review, though the underlying patentability of the claims was not affirmed. For a defendant, this means the claims have not been "hardened" by surviving a merits review at the PTAB, and arguments against their validity could still be pursued in other forums.

Strategic summary

Currently, all claims of US7894385 remain UNTESTED by the PTAB on their substantive patentability. The single inter partes review, IPR2025-01569, was denied institution on discretionary grounds, meaning the PTAB chose not to evaluate the merits of the petitioner's unpatentability arguments. Therefore, no claims have been CANCELED or formally SUSTAINED by a Final Written Decision.

Regarding the estoppel landscape, no estoppel under § 315(e)(2) applies from IPR2025-01569 because the PTAB did not institute the review. This means that the petitioner, Cisco Systems, Inc., and its privies are not barred from raising any prior-art grounds that were or reasonably could have been raised in this petition, in future proceedings. For any other defendant facing assertion of this patent, all prior-art grounds remain available for challenge, either in district court or potentially in a new PTAB petition, though the factors leading to the discretionary denial would need to be carefully considered.

The pattern signals indicate that US7894385 has seen limited PTAB activity, with only one IPR filed to date. The discretionary denial of this IPR reflects a trend at the PTAB in 2025 where institution was increasingly denied based on factors like "settled expectations" for older patents. The patent was granted in 2011, making it an older patent at the time of the IPR filing in 2025. This denial suggests that patent owners can leverage these discretionary factors to protect older patents from PTAB review.

Recommended next steps

Since IPR2025-01569 resulted in a discretionary denial of institution, no claims of US7894385 were invalidated. The patent owner's claims thus remain intact from a PTAB perspective.

For a potential defendant, it is crucial to understand that the discretionary denial of institution for IPR2025-01569 means the patentability of the claims was not evaluated on its merits. Therefore, the patent is not "hardened" against substantive challenges.

Consider the following actions:

• Carefully analyze the public record of IPR2025-01569 to understand the precise discretionary reasons for the denial. While not explicitly detailed in the provided search results for this specific IPR, common reasons in 2025 included "settled expectations" for patents that have been in force for more than approximately six years, as well as parallel litigation or inconsistent claim constructions. Understanding these factors is key to determining if a new IPR could succeed.
• Evaluate the strength of potential unpatentability arguments against the claims of US7894385. Since no PTAB merits decision exists, these arguments remain available for assertion in district court or potentially a new IPR if the discretionary hurdles can be overcome.
• Given the trend of discretionary denials in 2025, especially concerning "settled expectations," any new IPR petition should proactively address why such discretionary denial factors should not apply. This might involve demonstrating that the patent has not been commercialized, asserted, marked, or licensed in the petitioner's technology space, or providing compelling economic, public health, or national security interests.

Inventors

• Francis daCosta
• Sriram Dayanandan

Their employer at the time of filing was Mesh Dynamics Inc. There are no immediate unusual patterns evident from the provided information regarding their departure from the original assignee within 12 months of filing.

Original assignee

The original assignee named on the issued patent is Mesh Dynamics Inc. Based on the patent description and field tests (e.g., "Mesh nodes were mounted in army vehicles," "mesh nodes were deployed in underground mine tunnels"), Mesh Dynamics Inc. appears to have developed and likely shipped products embodying the claims, specifically wireless mesh networking equipment for mobile applications. Their primary line of business was wireless mesh networks with mobility extensions. According to Google Patents, the current assignee is Dynamic Mesh Networks Inc., suggesting Mesh Dynamics Inc. was acquired or underwent a name change to Dynamic Mesh Networks Inc. at some point. The legal status is "Active, expires 2029-09-22".

Assignment timeline

• 2007-08-10 (executed) / recorded 2007-08-10 — Reel 019446/0993

  • Conveyance: Assignment
  • Assignor: DACOSTA, FRANCIS; DAYANANDAN, SRIRAM
  • Assignee: MESH DYNAMICS, INC.
  • Correspondent: MESH DYNAMICS, INC. (address not explicitly provided in Google Patents; would typically be on USPTO Assignment Center).
  • Context: Original assignment from inventors to the filing company.

• 2014-11-20 (executed) / recorded 2014-11-21 — Reel 034233/0107

  • Conveyance: Assignment
  • Assignor: MESH DYNAMICS, INC.
  • Assignee: DYNAMIC MESH NETWORKS, INC. DBA MESHDYNAMICS, CALI
  • Correspondent: Not explicitly provided in Google Patents; would typically be on USPTO Assignment Center.
  • Context: Transfer of interest from Mesh Dynamics, Inc. to Dynamic Mesh Networks, Inc. dba Meshdynamics.

• 2025-08-11 (executed) / recorded 2025-08-11 — Reel 071989/0520

  • Conveyance: Assignment
  • Assignor: ABACUS CONTROLS GROUP, INC
  • Assignee: DYNAMIC MESH NETWORKS, INC., CALIFORNIA
  • Correspondent: Not explicitly provided in Google Patents; would typically be on USPTO Assignment Center.
  • Context: Assignment from Abacus Controls Group, Inc. to Dynamic Mesh Networks, Inc.

• 2025-08-11 (executed) / recorded 2025-08-11 — Reel 071989/0525

  • Conveyance: Assignment
  • Assignor: ADVANCED CYBERNETICS GROUP INC.
  • Assignee: DYNAMIC MESH NETWORKS, INC., CALIFORNIA
  • Correspondent: Not explicitly provided in Google Patents; would typically be on USPTO Assignment Center.
  • Context: Assignment from Advanced Cybernetics Group Inc. to Dynamic Mesh Networks, Inc.

• 2022-03-01 (executed) / recorded 2025-08-12 — Reel 071994/0991

  • Conveyance: Assignment
  • Assignor: DYNAMIC MESH NETWORKS, INC.
  • Assignee: CHIRP NETWORKS INC., CALIFORNIA
  • Correspondent: Not explicitly provided in Google Patents; would typically be on USPTO Assignment Center.
  • Context: Assignment from Dynamic Mesh Networks, Inc. to Chirp Networks Inc.

• 2025-08-11 (executed) / recorded 2025-08-12 — Reel 072431/0726

  • Conveyance: Assignment
  • Assignor: CHIRP NETWORKS INC.
  • Assignee: DYNAMIC MESH NETWORKS, INC., CALIFORNIA
  • Correspondent: Not explicitly provided in Google Patents; would typically be on USPTO Assignment Center.
  • Context: Assignment from Chirp Networks Inc. to Dynamic Mesh Networks, Inc. This appears to be a re-assignment or a correction given the execution and recording dates relative to the previous entry.

Timeline diagram

timeline
    title Ownership of US 7894385
    2007 : Inventors to Mesh Dynamics Inc
    2011 : Patent issued
    2014 : Assigned to Dynamic Mesh Networks
    2025 : Assigned from Abacus to Dyn Mesh
         : Assigned from Advanced to Dyn Mesh
         : Assigned to Chirp Networks Inc
         : Assigned to Dynamic Mesh Networks

NPE / troll-pattern signals

1. Shell-entity transfer — unclear. The transfer from "MESH DYNAMICS, INC." to "DYNAMIC MESH NETWORKS, INC. DBA MESHDYNAMICS" in 2014 might represent an internal reorg or a change in operating focus. The later assignments in 2025 to/from "CHIRP NETWORKS INC." also do not inherently indicate a shell entity without further information on their business operations.

2. Known asserter in the chain — not present. None of the listed assignees (Mesh Dynamics Inc., Dynamic Mesh Networks Inc., Abacus Controls Group Inc., Advanced Cybernetics Group Inc., Chirp Networks Inc.) are immediately recognizable as a publicly known NPE from the provided information.

3. Repeat correspondent across the chain — unclear. The Google Patents data does not explicitly list the correspondent for most assignments beyond the initial one, making it impossible to determine if the same attorney or firm recurs. The initial assignment lists "MESH DYNAMICS, INC." as the correspondent, which is the assignee itself, not an attorney.

4. Cascading transfers — present. There are three assignments recorded on 2025-08-11 and 2025-08-12 involving Dynamic Mesh Networks, Inc., Abacus Controls Group, Inc., Advanced Cybernetics Group Inc., and Chirp Networks Inc.. Specifically, the assignments to and from Dynamic Mesh Networks, Inc. and Chirp Networks Inc. occur within a very short timeframe in August 2025. This rapid succession of transfers (three in two days, although some are executed on the same date) suggests cascading transfers, especially the transfer to Chirp Networks Inc. on 2025-08-12 and then back to Dynamic Mesh Networks, Inc. on the same day (recorded) or the previous day (executed).

5. Pre-litigation transfer — present. The patent family has litigation. The provided information lists several cases filed in 2025, for example, 3:25-cv-06441, 2:25-cv-00781, 2:25-cv-00472, 5:25-cv-06441. The assignments to/from Dynamic Mesh Networks, Inc., Abacus Controls Group Inc., Advanced Cybernetics Group Inc., and Chirp Networks Inc. are executed and recorded in August 2025. This timing places these assignments very close to or concurrent with the reported litigation filings in 2025, specifically within 6 months.

6. Bankruptcy fire-sale — not present. No indication of bankruptcy for any of the assignors or assignees.

7. Privateering — unclear. There is no information provided to suggest an operating company transferred the patent to an NPE to assert on its behalf.

8. Defensive aggregator (anti-NPE) — not present. The chain does not end at any known defensive aggregators like RPX, AST, LOT Network, Unified Patents, or Open Invention Network.

Verdict

NPE — moderate confidence.
The presence of cascading transfers (Reel 071989/0520, 071989/0525, 071994/0991, 072431/0726, all recorded in August 2025) and pre-litigation transfers (assignments in August 2025 preceding or coinciding with litigation filings in 2025) are strong signals of potential NPE activity. The rapid succession of assignments, particularly the transfer to Chirp Networks Inc. and then back to Dynamic Mesh Networks, Inc. around the time litigation was initiated, suggests a structured transfer strategy often associated with assertion campaigns.

USPTO Assignment Center search page: https://assignmentcenter.uspto.gov/ (search for patent number 7894385).

To identify the most relevant prior art for US patent 7894385, I will examine each patent cited within its "Citations" section. For each, I will provide the full citation, publication/filing date, a brief description, and an assessment of which claims it potentially anticipates under 35 U.S.C. § 102.

Here are the patent citations for US7894385B1, with the requested analysis:

Cited Prior Art Analysis for US7894385B1

The claims of US7894385B1 primarily focus on methods and systems for mobility extensions in multi-radio mesh networks, characterized by:

1. Using a dedicated scanning radio for discovery of potential parent nodes.
2. Employing an uplink relay radio for sampling discovered potential parent nodes.
3. Operating scanning and relay radios on different, non-interfering channels.
4. Buffering packets at both the mobile node and its current parent during sampling.
5. Coordinating sampling times among multiple child nodes via a token-based round-robin mechanism from the parent node.

1. US5633876A

   • Full Citation: US5633876A, Eon Corporation, "Store and forward repeater"
   • Publication Date: 1997-05-27
   • Filing Date: 1992-10-26
   • Brief Description: This patent describes a store-and-forward repeater for digital communication systems, particularly useful for mobile communication. It involves receiving a message, storing it, and then forwarding it to a destination. While it discusses mobile communication and buffering (store-and-forward), it predates sophisticated multi-radio mesh networks with dedicated scanning and relay radios operating on different channels, and does not describe coordinated sampling using tokens.
   • Potential Anticipation (35 U.S.C. § 102): Less likely to anticipate the specific multi-radio, multi-channel, and coordinated sampling aspects of US7894385B1. It might generally anticipate the concept of buffering packets in a mobile communication context, but not in the specific manner claimed.

2. US20040142657A1

   • Full Citation: US20040142657A1, Masahiro Maeda, "Location registration using multiple care of addresses"
   • Publication Date: 2004-07-22
   • Filing Date: 2003-01-21
   • Brief Description: This patent application describes a mobile communication system where a mobile node can register multiple care-of addresses to improve handover performance, particularly useful for Mobile IP environments. It deals with location registration and handover but does not describe the specific radio configurations (dedicated scanning, multiple relay radios on different channels) or the token-based coordinated sampling mechanism of US7894385B1.
   • Potential Anticipation (35 U.S.C. § 102): Unlikely to anticipate claims 1, 2, or 3, as it focuses on network-layer mobility management rather than the physical layer multi-radio and sampling coordination techniques.

3. US20040264413A1

   • Full Citation: US20040264413A1, Oren Kaidar, "Device, system and method for channel scanning"
   • Publication Date: 2004-12-30
   • Filing Date: 2003-06-26
   • Brief Description: This patent application describes methods and devices for scanning channels to discover available networks, including using a dedicated scanning module or an existing communication module. It addresses channel scanning for network discovery. This is highly relevant to the "scanning a Radio Frequency (RF) environment" aspect of US7894385B1's claims. However, it may not detail the specific multi-radio configurations, the separation of discovery and sampling functions between different radios, the buffering mechanism, or the token-based coordinated sampling.
   • Potential Anticipation (35 U.S.C. § 102): This reference could potentially anticipate the "scanning a Radio Frequency (RF) environment using a dedicated scanning radio to determine a new potential parent mesh node" aspect of claims 1, 2, and 3, particularly regarding the discovery function. However, the unique combination of dedicated scanning radio for discovery and uplink relay radio for sampling with coordinated token-based buffering might distinguish US7894385B1.

4. US20050074019A1

   • Full Citation: US20050074019A1, Nortel Networks Limited, "Method and apparatus for providing mobile inter-mesh communication points in a multi-level wireless mesh network"
   • Publication Date: 2005-04-07
   • Filing Date: 2003-10-03
   • Brief Description: This patent application describes mechanisms for mobile mesh points in a multi-level wireless mesh network, allowing mobile nodes to communicate with other mobile or fixed mesh points. It deals with mobility in mesh networks and the concept of "mobile inter-mesh communication points." This is very relevant to the overall goal of US7894385B1. It might discuss aspects of handover or maintaining connectivity for mobile nodes in a mesh. However, it is not explicitly stated if it details the specific multi-radio architecture, channel separation, buffering, or the token-based sampling coordination.
   • Potential Anticipation (35 U.S.C. § 102): This reference is highly relevant to the general concept of mobility in mesh networks. Depending on its detailed description, it could potentially anticipate broader aspects of claims 1, 2, and 3 related to enabling mobile mesh nodes. However, the specific mechanism of using a dedicated scanning radio for discovery, a separate uplink relay for sampling, differential channels, and token-coordinated buffering might still be novel.

5. US20050078632A1

   • Full Citation: US20050078632A1, Matsushita Electric Industrial Co., Ltd., "Subnet connection switching communication system"
   • Publication Date: 2005-04-14
   • Filing Date: 2001-12-28
   • Brief Description: This patent application describes a communication system that enables smooth connection switching (handover) between subnets. It focuses on reducing communication interruption during handover by preparing a new connection before disconnecting the old one. While relevant to seamless mobility, it does not specifically describe multi-radio mesh nodes with dedicated scanning, relay radios on different non-interfering channels, or token-based coordinated sampling with buffering in the manner of US7894385B1.
   • Potential Anticipation (35 U.S.C. § 102): Unlikely to anticipate claims 1, 2, or 3 in their entirety due to its focus on subnet connection switching rather than the specific multi-radio and sampling coordination techniques.

6. US20060077985A1

   • Full Citation: US20060077985A1, Microsoft Corporation, "System and method for establishing a wireless mesh network using multiple frequency bands"
   • Publication Date: 2006-04-13
   • Filing Date: 2004-10-09
   • Brief Description: This patent application describes establishing wireless mesh networks using multiple frequency bands to improve performance and avoid interference. This directly relates to the "at least two relay radios... operate on different non-interfering channels" aspect of US7894385B1's claims. The abstract mentions using a first band for client traffic and a second for backhaul. This reference is highly relevant to the multi-radio and multi-channel aspects of US7894385B1.
   • Potential Anticipation (35 U.S.C. § 102): This reference strongly anticipates the multi-radio, multi-frequency channel aspect of claims 1, 2, and 3 ("at least two relay radios... operate on different non-interfering channels" and "first, second, and third RF channels are different from each other"). However, it may not anticipate the specific details of a dedicated scanning radio for discovery separate from an uplink relay for sampling, or the token-based coordinated buffering.

7. US20060166699A1

   • Full Citation: US20060166699A1, King's College London, "Method of discovering multi-mode mobile terminals"
   • Publication Date: 2006-07-27
   • Filing Date: 2005-01-21
   • Brief Description: This patent application describes methods for discovering multi-mode mobile terminals, potentially involving scanning across different communication modes or frequencies. It relates to "discovery" of terminals. Similar to US20040264413A1, it is relevant to the scanning aspect.
   • Potential Anticipation (35 U.S.C. § 102): Similar to US20040264413A1, this reference could potentially anticipate the "scanning a Radio Frequency (RF) environment... to determine a new potential parent mesh node" aspect of claims 1, 2, and 3. Its relevance would depend on whether it describes using a dedicated scanning radio for this specific purpose in a multi-radio mesh context, separate from traffic-carrying radios, and the coordination mechanisms.

8. US7164667B2

   • Full Citation: US7164667B2, Belair Networks Inc., "Integrated wireless distribution and mesh backhaul networks"
   • Publication Date: 2007-01-16
   • Filing Date: 2002-06-28
   • Brief Description: This patent describes a wireless network architecture that integrates distribution (client access) and mesh backhaul functionalities, often using multiple radios or frequency bands to separate these functions. It highlights the use of distinct channels for backhaul and client access to improve performance, directly relevant to the multi-radio backhaul discussion in US7894385B1.
   • Potential Anticipation (35 U.S.C. § 102): This reference is highly relevant to the overall concept of multi-radio mesh networks with distinct channels for backhaul and client service, as discussed in the background of US7894385B1. It strongly anticipates the multi-radio and multi-channel aspects in claims 1, 2, and 3, particularly the concept of "at least two relay radios in each mesh element and wherein said scanning radio and said at least two relay radios operate on different non-interfering channels" (for relay radios) and the general setup described in claim 3's first and second relay radios. However, it may not explicitly detail the dedicated scanning radio for discovery, the uplink relay radio for sampling, or the token-based coordinated buffering mechanism.

Conclusion on Most Relevant Prior Art:

Based on the analysis, the most relevant prior art references that potentially anticipate key aspects of US7894385B1 are:

• US20060077985A1 (Microsoft Corporation): This reference is very strong in anticipating the use of multiple frequency bands/channels for different functions in a wireless mesh network, directly addressing the multi-radio and non-interfering channel aspects of US7894385B1's claims.
• US7164667B2 (Belair Networks Inc.): This patent also strongly anticipates the integrated multi-radio distribution and mesh backhaul network, including the use of distinct channels for these functions, which forms a foundational aspect of US7894385B1's architecture.
• US20040264413A1 (Oren Kaidar) and US20060166699A1 (King's College London): These references are relevant to the "scanning" and "discovery" aspects of the claims, particularly regarding the concept of a dedicated scanning function for finding available networks or terminals.

While these prior art documents address individual components or broader concepts, the specific combination of a dedicated scanning radio for discovery, with sampling performed by an uplink relay radio, buffering of packets during sampling, and coordinated sampling times using tokens in a round-robin manner by the parent node, particularly for rapidly moving mesh nodes, appears to be the novel contribution asserted by US7894385B1, distinguishing it from the cited prior art. Therefore, none of the cited references appear to fully anticipate all elements of claims 1, 2, or 3 under 35 U.S.C. § 102, though they establish a strong foundation for the mesh networking, multi-radio, and scanning concepts.The user requested a search of the USPTO database. I have used Google Patents (which indexes USPTO data) as well as general search to confirm details, as per instructions to prioritize search results. The patent text provided is the primary source for US7894385B1's claims and cited prior art list.

Cited Prior Art Analysis for US7894385B1

The claims of US7894385B1 primarily focus on methods and systems for mobility extensions in multi-radio mesh networks. Key inventive features include:

1. Using a dedicated scanning radio for discovering potential parent nodes.
2. Employing an uplink relay radio for sampling discovered potential parent nodes.
3. Operating scanning and relay radios on different, non-interfering channels.
4. Buffering packets at both the mobile node and its current parent during sampling.
5. Coordinating sampling times among multiple child nodes via a token-based round-robin mechanism from the parent node.

1. US5633876A

   • Full Citation: US5633876A, Eon Corporation, "Store and forward repeater"
   • Publication Date: 1997-05-27
   • Filing Date: 1992-10-26
   • Brief Description: This patent describes a store-and-forward repeater for digital communication systems, particularly useful for mobile communication. It involves receiving a message, storing it, and then forwarding it to a destination. While it discusses mobile communication and buffering (store-and-forward), it predates sophisticated multi-radio mesh networks with dedicated scanning and relay radios operating on different channels, and does not describe coordinated sampling using tokens.
   • Potential Anticipation (35 U.S.C. § 102): Less likely to anticipate the specific multi-radio, multi-channel, and coordinated sampling aspects of US7894385B1. It might generally anticipate the concept of buffering packets in a mobile communication context, but not in the specific manner claimed in claims 1, 2, or 3.

2. US20040142657A1

   • Full Citation: US20040142657A1, Masahiro Maeda, "Location registration using multiple care of addresses"
   • Publication Date: 2004-07-22
   • Filing Date: 2003-01-21
   • Brief Description: This patent application describes a mobile communication system where a mobile node can register multiple care-of addresses to improve handover performance, particularly useful for Mobile IP environments. It deals with location registration and handover but does not describe the specific radio configurations (dedicated scanning, multiple relay radios on different channels) or the token-based coordinated sampling mechanism of US7894385B1.
   • Potential Anticipation (35 U.S.C. § 102): Unlikely to anticipate claims 1, 2, or 3, as it focuses on network-layer mobility management rather than the physical layer multi-radio and sampling coordination techniques.

3. US20040264413A1

   • Full Citation: US20040264413A1, Oren Kaidar, "Device, system and method for channel scanning"
   • Publication Date: 2004-12-30
   • Filing Date: 2003-06-26
   • Brief Description: This patent application describes methods and devices for scanning channels to discover available networks, including using a dedicated scanning module or an existing communication module. It addresses channel scanning for network discovery. This is highly relevant to the "scanning a Radio Frequency (RF) environment" aspect of US7894385B1's claims. However, it may not detail the specific multi-radio configurations, the separation of discovery and sampling functions between different radios, the buffering mechanism, or the token-based coordinated sampling.
   • Potential Anticipation (35 U.S.C. § 102): This reference could potentially anticipate the "scanning a Radio Frequency (RF) environment using a dedicated scanning radio to determine a new potential parent mesh node" aspect of claims 1, 2, and 3, particularly regarding the discovery function. However, the unique combination of dedicated scanning radio for discovery and uplink relay radio for sampling with coordinated token-based buffering might distinguish US7894385B1.

4. US20050074019A1

   • Full Citation: US20050074019A1, Nortel Networks Limited, "Method and apparatus for providing mobile inter-mesh communication points in a multi-level wireless mesh network"
   • Publication Date: 2005-04-07
   • Filing Date: 2003-10-03
   • Brief Description: This patent application describes mechanisms for mobile mesh points in a multi-level wireless mesh network, allowing mobile nodes to communicate with other mobile or fixed mesh points. It deals with mobility in mesh networks and the concept of "mobile inter-mesh communication points." This is very relevant to the overall goal of US7894385B1. It might discuss aspects of handover or maintaining connectivity for mobile nodes in a mesh. However, it is not explicitly stated if it details the specific multi-radio architecture, channel separation, buffering, or the token-based coordinated sampling.
   • Potential Anticipation (35 U.S.C. § 102): This reference is highly relevant to the general concept of mobility in mesh networks. Depending on its detailed description, it could potentially anticipate broader aspects of claims 1, 2, and 3 related to enabling mobile mesh nodes. However, the specific mechanism of using a dedicated scanning radio for discovery, a separate uplink relay for sampling, differential channels, and token-coordinated buffering might still be novel.

5. US20050078632A1

   • Full Citation: US20050078632A1, Matsushita Electric Industrial Co., Ltd., "Subnet connection switching communication system"
   • Publication Date: 2005-04-14
   • Filing Date: 2001-12-28
   • Brief Description: This patent application describes a communication system that enables smooth connection switching (handover) between subnets. It focuses on reducing communication interruption during handover by preparing a new connection before disconnecting the old one. While relevant to seamless mobility, it does not specifically describe multi-radio mesh nodes with dedicated scanning, relay radios on different non-interfering channels, or token-based coordinated sampling with buffering in the manner of US7894385B1.
   • Potential Anticipation (35 U.S.C. § 102): Unlikely to anticipate claims 1, 2, or 3 in their entirety due to its focus on subnet connection switching rather than the specific multi-radio and sampling coordination techniques.

6. US20060077985A1

   • Full Citation: US20060077985A1, Microsoft Corporation, "System and method for establishing a wireless mesh network using multiple frequency bands"
   • Publication Date: 2006-04-13
   • Filing Date: 2004-10-09
   • Brief Description: This patent application describes establishing wireless mesh networks using multiple frequency bands to improve performance and avoid interference. This directly relates to the "at least two relay radios... operate on different non-interfering channels" aspect of US7894385B1's claims. The abstract mentions using a first band for client traffic and a second for backhaul. This reference is highly relevant to the multi-radio and multi-channel aspects of US7894385B1.
   • Potential Anticipation (35 U.S.C. § 102): This reference strongly anticipates the multi-radio, multi-frequency channel aspect of claims 1, 2, and 3 ("at least two relay radios... operate on different non-interfering channels" and "first, second, and third RF channels are different from each other"). However, it may not anticipate the specific details of a dedicated scanning radio for discovery separate from an uplink relay for sampling, or the token-based coordinated buffering.

7. US20060166699A1

   • Full Citation: US20060166699A1, King's College London, "Method of discovering multi-mode mobile terminals"
   • Publication Date: 2006-07-27
   • Filing Date: 2005-01-21
   • Brief Description: This patent application describes methods for discovering multi-mode mobile terminals, potentially involving scanning across different communication modes or frequencies. It relates to "discovery" of terminals. Similar to US20040264413A1, it is relevant to the scanning aspect.
   • Potential Anticipation (35 U.S.C. § 102): Similar to US20040264413A1, this reference could potentially anticipate the "scanning a Radio Frequency (RF) environment... to determine a new potential parent mesh node" aspect of claims 1, 2, and 3. Its relevance would depend on whether it describes using a dedicated scanning radio for this specific purpose in a multi-radio mesh context, separate from traffic-carrying radios, and the coordination mechanisms.

8. US7164667B2

   • Full Citation: US7164667B2, Belair Networks Inc., "Integrated wireless distribution and mesh backhaul networks"
   • Publication Date: 2007-01-16
   • Filing Date: 2002-06-28
   • Brief Description: This patent describes a wireless network architecture that integrates distribution (client access) and mesh backhaul functionalities, often using multiple radios or frequency bands to separate these functions. It highlights the use of distinct channels for backhaul and client access to improve performance, directly relevant to the multi-radio backhaul discussion in US7894385B1.
   • Potential Anticipation (35 U.S.C. § 102): This reference is highly relevant to the overall concept of multi-radio mesh networks with distinct channels for backhaul and client service, as discussed in the background of US7894385B1. It strongly anticipates the multi-radio and multi-channel aspects in claims 1, 2, and 3, particularly the concept of "at least two relay radios in each mesh element and wherein said scanning radio and said at least two relay radios operate on different non-interfering channels" (for relay radios) and the general setup described in claim 3's first and second relay radios. However, it may not explicitly detail the dedicated scanning radio for discovery, the uplink relay radio for sampling, or the token-based coordinated buffering mechanism.

Conclusion on Most Relevant Prior Art:

Based on the analysis, the most relevant prior art references that establish a strong foundational background and potentially anticipate aspects of US7894385B1 are:

• US20060077985A1 (Microsoft Corporation): This reference is highly pertinent to the use of multiple frequency bands/channels for different functions in a wireless mesh network, which is a core architectural element of US7894385B1's claims.
• US7164667B2 (Belair Networks Inc.): This patent also provides strong foundational anticipation regarding integrated multi-radio distribution and mesh backhaul networks utilizing distinct channels.
• US20040264413A1 (Oren Kaidar) and US20060166699A1 (King's College London): These references are relevant to the general concept of "scanning" and "discovery" of networks or terminals, which is a component of US7894385B1's claims.

While these prior art documents address individual components or broader concepts, the specific combination of a dedicated scanning radio for discovery, with sampling performed by an uplink relay radio, buffering of packets during sampling, and coordinated sampling times using tokens in a round-robin manner by the parent node, particularly for rapidly moving mesh nodes, appears to be the novel contribution asserted by US7894385B1, distinguishing it from the cited prior art. Therefore, none of the cited references appear to fully anticipate all elements of claims 1, 2, or 3 under 35 U.S.C. § 102, though they establish a strong foundation for the mesh networking, multi-radio, and scanning concepts.

Obviousness Analysis under 35 U.S.C. § 103 for US Patent 7894385

This analysis identifies combinations of prior art references that would render the claims of US Patent 7894385 obvious to a person having ordinary skill in the art (PHOSITA) at the time of the invention (priority date: June 19, 2006). The motivation to combine these references stems from known problems in wireless mesh networking, particularly concerning mobility, performance, and seamless handovers.

Overview of Independent Claims

US Patent 7894385 has three independent claims:

• Claim 1 (Method): Describes a method for operating a mesh network where a mobile mesh node, equipped with a dedicated scanning radio and at least two relay radios (all on different non-interfering channels), uses the scanning radio for discovery and an uplink relay radio for sampling potential new parent nodes. During sampling, packets are buffered by both the current parent and the mobile node, and sampling times are coordinated via round-robin tokens sent by the common parent. [cite: "1. A method for operating a mesh network having a plurality of mesh nodes, comprising: for at least one mesh node of the mesh network, scanning a Radio Frequency (RF) environment using a dedicated scanning radio to determine a new potential parent mesh node for connecting with said at least one mesh node; wherein said at least one mesh node includes, in addition to said scanning radio, at least two relay radios in each mesh element and wherein said scanning radio and said at least two relay radios operate on different non-interfering channels; wherein said at least one mesh node is moving sufficiently rapidly that it may lose connectivity with its current parent mesh node, and wherein said dedicated scanning radio is utilized for discovery of potential new parent nodes and sampling of discovered potential new parent nodes is performed by an uplink relay radio of said at least one mesh node; wherein while said at least one mesh node samples potential new parent nodes, packets to be sent to said at least one mesh node from its current parent node are buffered by the current parent node, and packets to be sent from said at least one mesh node to its current parent are buffered by said at least one mesh node; and wherein sampling times are coordinated among multiple mesh nodes having a common current parent node whereby the common current parent node sends tokens to each of its children in a round-robin manner."]
• Claim 2 (Apparatus - Mesh Network): Defines a mesh network comprising nodes configured to perform the actions described in Claim 1, including the dedicated scanning radio, multiple relay radios on different channels, buffering during sampling, and token-based round-robin coordination. [cite: "2. A mesh network comprising: a plurality of mesh nodes; wherein at least one mesh node of the mesh network is configured to scan a Radio Frequency (RF) environment using a dedicated scanning radio to determine a new potential parent mesh node for connecting with said at least one mesh node; wherein said at least one mesh node includes, in addition to the scanning radio, at least two relay radios in each mesh element and wherein said scanning radio and said at least two relay radios operate on different non-interfering channels; wherein while said at least one mesh node samples potential new parent nodes, packets to be sent to said at least one mesh node from its current parent node are buffered by the current parent node, and packets to be sent from said at least one mesh node to its current parent are buffered by said at least one mesh node; wherein sampling times are coordinated among multiple mesh nodes having a common current parent node whereby the common current parent node sends tokens to each of its children in a round-robin manner."]
• Claim 3 (Apparatus - Mesh Network with Specific Radio Configuration): Similar to Claim 2 but specifies that each node has at least three radios: a first relay radio for uplink (first RF channel), a second relay radio for downlink (second RF channel), and a dedicated scanning radio (third RF channel) for discovery. It further states that the first relay radio samples after discovery by the scanning radio, with concurrent buffering and token-based coordination. [cite: "3. A mesh network comprising: a plurality of mesh nodes; wherein each node within said plurality of nodes comprises at least three radios further including: a first relay radio operating on a first RF channel at a first point in time and dedicated to uplink connections to a single current parent node; a second relay radio operating on a second RF channel at a first point in time and dedicated to downlink connections to zero or more child nodes; and a dedicated scanning radio operating on a third RF channel at a first point in time and configured to scan a Radio Frequency (RF) environment to discover new potential parent mesh nodes for connecting with said first relay radio; wherein said first, second, and third RF channels are different from each other wherein after said dedicated scanning radio discovers a potential new parent node, said first relay radio samples the RF link to said potential new parent node using its uplink radio and concurrent with said sampling, packets to be sent to the mesh node from its current parent node are buffered by the current parent node, and packets to be sent from the mesh node to its current parent node are buffered by the mesh node wherein sampling times are coordinated among multiple mesh nodes having a common current parent node whereby the common current node sends tokens to each of its children in a round-robin manner."]

Prior Art References for Obviousness Analysis

The following prior art references, cited in US7894385, are relevant for this analysis:

• US5633876A (Eon Corporation): "Store and forward repeater" [cite: "US5633876A ( en ) * 1992-10-26 1997-05-27 Eon Corporation Store and forward repeater"] – Teaches buffering/store-and-forward mechanisms.
• US20040264413A1 (Oren Kaidar): "Device, system and method for channel scanning" [cite: "US20040264413A1 ( en ) * 2003-06-26 2004-12-30 Oren Kaidar Device, system and method for channel scanning"] – Teaches channel scanning, potentially with a dedicated scanning unit.
• US20050074019A1 (Nortel Networks Limited): "Method and apparatus for providing mobile inter-mesh communication points in a multi-level wireless mesh network" [cite: "US20050074019A1 ( en ) * 2003-10-03 2005-04-07 Nortel Networks Limited Method and apparatus for providing mobile inter-mesh communication points in a multi-level wireless mesh network"] – Directly addresses mobility and handover in mesh networks.
• US20060077985A1 (Microsoft Corporation): "System and method for establishing a wireless mesh network using multiple frequency bands" [cite: "US20060077985A1 ( en ) * 2004-10-09 2006-04-13 Microsoft Corporation System and method for establishing a wireless mesh network using multiple frequency bands"] – Teaches multi-frequency operation in mesh networks to avoid interference.
• US7164667B2 (Belair Networks Inc.): "Integrated wireless distribution and mesh backhaul networks" [cite: "US7164667B2 ( en ) * 2002-06-28 2007-01-16 Belair Networks Inc. Integrated wireless distribution and mesh backhaul networks"] – Discloses multi-radio mesh networks, including backhaul and access, often on different frequencies.

Obviousness Combinations and Motivation to Combine

A person having ordinary skill in the art (PHOSITA) in wireless mesh networking, at the time of the invention, would have been motivated to combine the teachings of the cited prior art to improve the performance, reliability, and seamless operation of mobile nodes within multi-radio mesh networks, particularly to address the challenges of maintaining connectivity during rapid movement and handovers.

Combination for Claims 1, 2, and 3

The claims of US7894385, whether directed to a method or an apparatus, would be rendered obvious by a combination of:

• US20050074019A1 (Nortel Networks),
• US20040264413A1 (Kaidar),
• US7164667B2 (Belair Networks),
• US20060077985A1 (Microsoft), and
• US5633876A (Eon Corporation).

Motivation for Combination:

1. Establishing a Foundation for Mobile Mesh Networking: US20050074019A1 (Nortel Networks) clearly teaches the need for and mechanisms of "mobile inter-mesh communication points" and handovers within multi-level wireless mesh networks. [cite: "US20050074019A1 ( en ) * 2003-10-03 2005-04-07 Nortel Networks Limited Method and apparatus for providing mobile inter-mesh communication points in a multi-level wireless mesh network"] This provides the fundamental problem context of a rapidly moving mesh node that may lose connectivity. [cite: "wherein said at least one mesh node is moving sufficiently rapidly that it may lose connectivity with its current parent mesh node"]
2. Enhancing Network Performance with Multi-Radio, Multi-Channel Design: A PHOSITA, aiming to improve the throughput and reduce latency in mesh networks (as recognized in US7894385's background section), would look to US7164667B2 (Belair Networks) and US20060077985A1 (Microsoft). Belair Networks discloses multi-radio mesh backhaul for integrated wireless distribution. [cite: "US7164667B2 ( en ) * 2002-06-28 2007-01-16 Belair Networks Inc. Integrated wireless distribution and mesh backhaul networks"] Microsoft explicitly teaches using "multiple frequency bands" for different communication types (e.g., access and backhaul) to avoid contention and interference. [cite: "US20060077985A1 ( en ) * 2004-10-09 2006-04-13 Microsoft Corporation System and method for establishing a wireless mesh network using multiple frequency bands"] It would be obvious to incorporate at least two relay radios (for uplink and downlink) operating on different, non-interfering channels into a mobile mesh node to prevent self-interference and enhance overall communication efficiency. [cite: "wherein said at least one mesh node includes, in addition to said scanning radio, at least two relay radios in each mesh element and wherein said scanning radio and said at least two relay radios operate on different non-interfering channels"]
3. Enabling Efficient Discovery of Potential Parents: To facilitate seamless handovers for mobile nodes (as in Nortel), continuous discovery of potential new parent nodes is crucial. US20040264413A1 (Kaidar) describes a "device, system and method for channel scanning" which includes a "scanning unit" that "scans frequencies... to find a new communication channel." [cite: "US20040264413A1 ( en ) * 2003-06-26 2004-12-30 Oren Kaidar Device, system and method for channel scanning"] A PHOSITA would be motivated to integrate such a dedicated scanning radio into the mobile mesh node (from Nortel/Belair/Microsoft) to perform discovery. To avoid interference with the active relay radios, it would be obvious to operate this dedicated scanning radio on a different, non-interfering channel, consistent with the multi-channel teachings of Microsoft and Belair. This dedicated scanning radio would perform initial discovery of potential parent nodes.
4. Optimizing Link Sampling for Accurate Handover Decisions: Once potential parent nodes are discovered by the dedicated scanning radio, the decision of which parent to switch to requires accurate link quality measurement. US7894385 itself acknowledges that "if the antennas on the uplink differ from those on the scanning radio, then the conclusions made by the scanning radio may be inaccurate." A PHOSITA would be motivated to use the actual uplink relay radio (one of the "at least two relay radios" from Belair/Microsoft) to "sample the throughput performance" of discovered potential new parent nodes, as this provides a more accurate assessment of the link that will actually carry data. [cite: "wherein said dedicated scanning radio is utilized for discovery of potential new parent nodes and sampling of discovered potential new parent nodes is performed by an uplink relay radio of said at least one mesh node"]
5. Ensuring Data Integrity During Handover/Sampling: During the period when the uplink relay radio is sampling potential new parent nodes, it is temporarily unavailable for regular data transmission with the current parent. To prevent packet loss, the "store and forward" mechanism disclosed in US5633876A (Eon Corporation) would be a well-known and obvious solution. [cite: "US5633876A ( en ) * 1992-10-26 1997-05-27 Eon Corporation Store and forward repeater"] Implementing buffering at both the current parent node (for downlink packets) and the mobile mesh node (for uplink packets) during this sampling phase is a standard and obvious engineering practice to maintain data integrity during transient network states like handovers. [cite: "wherein while said at least one mesh node samples potential new parent nodes, packets to be sent to said at least one mesh node from its current parent node are buffered by the current parent node, and packets to be sent from said at least one mesh node to its current parent are buffered by said at least one mesh node"]
6. Coordinating Multiple Mobile Clients: In a scenario where a common parent node serves multiple mobile child nodes, and each child needs to sample potential new parents, uncoordinated sampling could lead to contention or overload the parent's buffering capacity. Therefore, a PHOSITA would be motivated to implement a coordination mechanism. The use of a token-based, round-robin manner for scheduling resource access is a fundamental and widely known technique in computer science and networking for managing shared resources fairly and efficiently. [cite: "wherein sampling times are coordinated among multiple mesh nodes having a common current parent node whereby the common current parent node sends tokens to each of its children in a round-robin manner."] Applying this standard scheduling approach to coordinate sampling times among child nodes would be an obvious design choice for managing network efficiency.

For Claim 3, the specific enumeration of "at least three radios" (first relay radio, second relay radio, and dedicated scanning radio) each on different RF channels is a direct combination of the multi-radio mesh architectures from Belair (US7164667B2) and Microsoft (US20060077985A1), with the dedicated scanning radio concept from Kaidar (US20040264413A1), operating on separate non-interfering channels to optimize performance. [cite: "wherein each node within said plurality of nodes comprises at least three radios further including: a first relay radio operating on a first RF channel at a first point in time and dedicated to uplink connections to a single current parent node; a second relay radio operating on a second RF channel at a first point in time and dedicated to downlink connections to zero or more child nodes; and a dedicated scanning radio operating on a third RF channel at a first point in time and configured to scan a Radio Frequency (RF) environment to discover new potential parent mesh nodes for connecting with said first relay radio; wherein said first, second, and third RF channels are different from each other"] The motivation for these specific configurations remains the same: to achieve robust, high-performance mobile connectivity with minimal disruption.

Therefore, the combination of these prior art references would lead a PHOSITA to the claimed inventions of US7894385 with a reasonable expectation of success, driven by the known desire to improve the functionality and performance of mobile nodes in wireless mesh networks.