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Method for executing handover in a radio extension of an ATM network

  • US 5,896,373 A
  • Filed: 02/18/1997
  • Issued: 04/20/1999
  • Est. Priority Date: 02/22/1996
  • Status: Expired due to Term
First Claim
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1. A method for executing a handover in a data transmission system comprising a switch, a first access point, a second access point and a mobile terminal, and wherein data is transmitted in cells of a determined size, in which method, prior to the handover, cells are transferred from said switch to said first access point and therefrom by radio connection to said mobile terminal, and after the handover from said switch to said second access point and therefrom by radio connection to said mobile terminal, in which case said switch informs said first access point as to which is the last cell transmitted from the switch to the first access point, wherein said first access point checks whether all cells forwarded from the switch to the first access point prior to the handover were successfully transferred to said mobile terminal, whereafteras a response to the observation of the first access point that all cells forwarded from the switch to the first access point prior to the handover were successfully transmitted to said mobile terminal, said first access point acknowledges successful downlink transmission to said mobile terminal, which as a response to said acknowledgement further informs the second access point that the downlink transmission via the first access point has succeeded, andas a response to the observation of the first access point that not all cells forwarded from the switch to the first access point prior to the handover were successfully transmitted to said mobile terminal, said first access point directs those cells that were not successfully transmitted to said mobile terminal to be forwarded to the second access point.

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