Invalidity dossier
US 5490136
Method of controlling transmission on a same radio channel of variable-rate information streams in radio communication systems
Current assignee: Telecom Italia SpA
Added 9/21/2026, 10:46:58 AM
Active provider: DeepSeek · deepseek-flash
Patent summary
Title, assignee, inventors, filing/issue dates, abstract, and a plain-language overview of the claims.
US5490136A — Patent Overview
Title: Method of controlling transmission on a same radio channel of variable-rate information streams in radio communication systems
Patent number: US5490136A (application US08/241,207)
Inventors: Daniele Sereno; Karl Hellwig; Ermanno Berruto
Original assignee: CSELT Centro Studi e Laboratori Telecomunicazioni SpA; US Philips Corp. Current assignee listed as Telecom Italia SpA; US Philips Corp.
Dates: Priority date 1993-05-14; filing date 1994-05-10; publication/grant date 1996-02-06. Status listed as "Expired – Lifetime," with anticipated expiration 2014-05-10. Legal status is stated as an assumption, not a legal conclusion.
Purpose: To control transmission on a single radio channel of variable-rate information streams related to the same communication but originating from different sources. The stated aim is a more flexible rate choice than known systems (e.g., the Qualcomm-proposed wideband spread spectrum system, which forces maximum rate whenever control signals must be sent, potentially degrading speech quality). The invention instead selects rates based on a joint assessment of individual stream needs so as to keep quality of service constant.
Plain-language scope: Each stream is emitted at a source rate chosen from a respective set, then associated with a redundancy (selected from a set of redundancy schemes) that increases the stream rate. A control unit receives from the sources their preferred emission rate, and from management units the channel/system needs expressed as redundancy and channel rate. It then commands the sources and redundancy means to select particular rates and redundancies that guarantee a predetermined communication and service quality. If the combined total rate (stream rates plus redundancy increments) fits within the system-imposed rate, the respective needs are met; otherwise each stream receives a rate and redundancy that minimize a communication cost given by the sum of costs from individual needs. The excerpt mentions mobile systems, coded speech and control signals, CDMA, FIG. 1/FIG. 2 block diagrams, and multiple claims, but omits the actual claim language and detailed description.
Source: https://patents.google.com/patent/[US5490136](/patent/US5490136)/en
What the excerpt does not establish: It provides no claim text, full description, or drawings; no validity, enforceability, or infringement analysis; no litigation or ownership-transfer history; and no verified prior-art comparison.
Generated 10/1/2026, 10:01:08 PM
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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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