Invalidity dossier
US 7075907
Method for signalling DTX periods and allocation of new channels in a statistical multiplexed radio interface
Current assignee: Iot Innovations LLC
Added 11/4/2026, 4:00:57 AM
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Patent summary
Title, assignee, inventors, filing/issue dates, abstract, and a plain-language overview of the claims.
Patent Overview: US 7,075,907 B1
Title: Method for signalling DTX periods and allocation of new channels in a statistical multiplexed radio interface
Patent number / application: US 7,075,907 B1; Application No. US09/587,993
Inventor: Raino Lintulampi
Assignee information (as listed in the source): Original assignee Nokia Inc (later Nokia Mobile Phones Limited); current assignee listed as Iot Innovations LLC. (Per instructions, ownership-transfer details are not analyzed here.)
Key dates (as listed): Priority/filing date 2000-06-06; granted/publication date 2006-07-11; legal status "Expired – Lifetime," adjusted expiration 2023-04-10.
Purpose and plain-language scope:
The patent addresses how to handle channel signaling in wireless systems (e.g., GSM/GPRS/EGPRS, GERAN Release 2000) that use "statistical multiplexing" for circuit-switched voice. Under such an approach, a voice user's channel can be reassigned to another user during a Discontinuous Transmission (DTX) pause—typically a speech pause. The inventor observed that releasing and re-requesting a channel at every DTX period causes an inordinate amount of signaling.
The disclosed method: when the mobile station or network signals that it is temporarily ceasing transmission of circuit-switched information (entering DTX), the network determines whether the currently assigned traffic channel can be retained by the mobile station or must be released (e.g., because another user needs it). Only if release is required does the network signal the mobile station to release the channel. If a new circuit-switched frame is later needed, it can be sent on the retained channel. Retaining an uplink/downlink channel also allows comfort-noise (CN) parameters to continue to be exchanged during DTX, improving voice quality. Channels may be released during DTX only when a release criterion—such as another user's need—is satisfied, thereby reducing signaling load.
Source: https://patents.google.com/patent/US7075907/en
What the excerpt does not establish: The excerpt does not include the full claims, detailed description, drawing descriptions, or complete referenced prior-art analysis; it therefore does not establish the precise scope of any individual claim, the full technical implementation, or the content of cited prior-art patents beyond those named (e.g., U.S. Pat. Nos. 5,960,389 and 5,835,889).
Generated 11/4/2026, 4:01:12 AM
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Litigation summary
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PTAB challenges
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Assignment history
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Prior art
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Obviousness
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Extensions
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Derivative works
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