Invalidity dossier
US 5734646
Code division multiple access system providing load and interference based demand assignment service to users
Current assignee: Nokia of America Corp
Added 9/21/2026, 9:43:17 AM
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Patent summary
Title, assignee, inventors, filing/issue dates, abstract, and a plain-language overview of the claims.
Patent Overview — US5734646A
Title: Code division multiple access system providing load and interference based demand assignment service to users.
Patent number / application: US5734646A; application US08/539,476.
Inventors: Chih-Lin I and Sanjiv Nanda.
Assignee (per source): Original assignee Lucent Technologies Inc.; current assignee listed as Nokia of America Corp. (The source notes listed assignees may be inaccurate and that no legal analysis or warranty is made as to the list.)
Key dates: Priority/filing date 1995-10-05; publication/grant 1998-03-31; anticipated expiration 2015-10-05. Legal status listed as "Expired – Fee Related." The source states legal status is an assumption, not a legal conclusion.
Purpose: The invention relates to CDMA systems and, more particularly, to a CDMA system for allocating data rate to a user based on the load and interference of the system. The described Load and Interference based Demand Assignment (LIDA) techniques are said to protect voice and other high-priority or delay-sensitive isochronous users while accommodating peak data-rate needs of high-data-rate users when system load permits.
Plain-language scope (per excerpt): A CDMA system has multiple cells, each with a base station and multiple mobile stations. A mobile station with an established high-burst-rate data call may send a data-burst request for a rate above its basic data rate B. The request includes pilot strength information for its own cell's base station and at least one adjacent cell. Assuming a known level of load in the first cell, an access controller uses the received pilot strength to decide whether to grant an increased data rate, and if granted, sends a data-burst assignment response. The increased rate may be granted at the requested rate when pilot strengths from all adjacent base stations do not exceed a threshold. Features include a series of thresholds each associated with a permitted data rate, and use of average adjacent-cell loads with pilot strength information. Higher rates may be provided via multiple simultaneous channels or variable spreading gain, coding rate, chip rate, or modulation (e.g., MC-CDMA).
What the excerpt does not establish: It does not establish claim text, validity, enforceability, litigation, ownership accuracy, or prior-art effect. Litigation, ownership transfers, validity, and prior art were not researched per instructions.
Source: https://patents.google.com/patent/[US5734646](/patent/US5734646)/en
Generated 10/1/2026, 10:01:52 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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