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- Nachgewiesen in: USPTO Patent Grants
- Sprachen: English
- Patent Number: 6,876,666
- Publication Date: April 05, 2005
- Appl. No: 09/608945
- Application Filed: June 30, 2000
- Assignees: Nokia Networks Oy (Nokia Group, FI)
- Claim: 1. A method for sample rate adaptation in a telecommunication system, the method comprising the steps of: supplying a first data stream of data cells via a network operated at a first sample rate; passing said first data stream through a data modifying means; outputting said first data stream as output data out of said data modifying means to a processing element; storing said output data in said processing element; and outputting said output data from said processing element as a second digital data stream at a second sample rate, said first and said second sample rate being different from each other; detecting a state of said processing element, wherein said state of said processing element detected represents an amount of data stored in said processing element, and wherein said detecting step comprises the steps of: comparing a current amount of data stored in said processing element with a lower limit and an upper limit of respective admissible data amounts stored in said processing element, and setting said state of said processing element to a first value in case a detected actual amount of stored data exceeds the upper limit, to a second value in case the detected actual amount of stored data is below the lower limit, and to a third value in case the detected actual amount of stored data is found to be between the lower limit and the upper limit; and controlling said data modifying means dependent on the state of the processing element detected, wherein said controlling step controls said data modifying means to be enabled if said detected state has said first or said second value, and to be disabled if said detected state has said third value.
- Claim: 2. A method according to claim 1 , wherein said controlling step further comprises the steps of: discarding data cells passed through said data modification means to thereby not be supplied to said processing means if said state has said first value, duplicating data cells passed through said data modification means to thereby be supplied plural times to said processing means if said state has said second value, and leaving the number of data cells passed through said data modification means unchanged and supplying the data cells to said processing means unchanged if said state has said third value.
- Claim: 3. A method according to claim 2 , wherein, in said controlling step, a data cell discarded or duplicated is a data cell transmitted immediately after setting of the status of said processing element to said first or second value, respectively.
- Claim: 4. A method according to claim 2 , wherein, in said controlling step, a data cell discarded or duplicated is a detected empty data cell transmitted within a predetermined time interval after setting of the state of said processing element to said first or second value, respectively.
- Claim: 5. A method according to claim 2 , wherein, in said controlling step, a data cell discarded or duplicated is a detected empty data cell transmitted among a predetermined number of data cells after setting of the state of said processing element to said first or second value, respectively.
- Claim: 6. A method according to claim 4 , wherein, in said controlling step, if no empty cell is detected and the amount of data stored in said processing element is detected to exceed a limit above said upper limit or to be below a limit below said lower limit, then a cell following that detection that the amount of data stored in said processing element exceeds said limit above said upper limit or is below said limit below said lower limit, is discarded or duplicated, respectively, irrespective of whether it is an empty cell or not.
- Claim: 7. A device for sample rate adaptation in a telecommunication system, the device comprising: a data modifying means, through which a first stream of data cells supplied via a network operated at a first sample rate is passed; a processing element to which said data stream passed through said data modifying means is input and stored, said data stream being output from said processing element as a second digital data stream at a second sample rate, with said first and said second sample rate being different from each other; a detection means for detecting a state of said processing element, said detection means including means for detection of a state of said processing element, wherein said state of said processing element detected represents an amount of data stored in said processing element, and wherein said means for detection comprises: means for comparing a current amount of data stored in said processing element with a lower limit and an upper limit of respective admissible data amounts stored in said processing element, and means for setting said state of said processing element to a first value in case a detected actual amount of stored data exceeds the upper limit, to a second value in case the detected actual amount of stored data is below the lower limit, and to a third value in case the detected actual amount of stored data is found to be between the lower limit and the upper limit; and a control means for controlling said data modifying means dependent on the detected state of the processing element, wherein said control means includes means for controlling said data modifying means to be enabled if said state detected has said first or said second value, and to be disabled if said state detected has said third value.
- Current U.S. Class: 370/466
- Patent References Cited: 4692894 September 1987 Bemis ; 5521918 May 1996 Kim ; 5659541 August 1997 Chan ; 5963153 October 1999 Rosefield et al. ; 6108560 August 2000 Navaro et al. ; 6181711 January 2001 Zhang et al. ; 6339596 January 2002 Kozaki et al. ; 6556560 April 2003 Katseff et al. ; 20020159457 October 2002 Zhang et al. ; WO 9522233 August 1995 ; WO 9732447 September 1997
- Other References: Abe, et al, “A Traffic Control Method for Service Quality Assurance in an ATM Network”, IEEE Journal on Selected Areas In Communications, Feb. 1, 1994, pp. 322-331, XP000458651. cited by other
- Assistant Examiner: Shah, Chirag
- Primary Examiner: Patel, Ajit
- Attorney, Agent or Firm: Squire, Sanders & Dempsey L.L.P.
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