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Method for performing a high speed automatic link transfer in a wireless personal communication system
| Details |
Inventors: Khan, Tayyab;
Assignee: Hughes Electronics Corporation (El Segundo, CA)
Primary Examiner: Eisenzopf; Reinhard J.
Assistant Examiner: Nguyen; Lee
Attorney, Agent or Firm: Whelan; John T., Sales; Michael
A method of implementing an improved automatic link transfer for high mobility use in a wireless personal communication system is provided. The method includes retuning a subscriber unit to a new radio port frequency, reading an access message and initiating encrypted voice transmission from the subscriber unit, based on the access message, before receiving an acknowledgement from a radio port controller. A data structure for an access rights message is provided including a frame counter variable to allow for expedited processing of an automatic link transfer. A data structure for an automatic link transfer request message is provided that permits faster determination of the type of automatic link transfer necessary. |
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DETAILED DESCRIPTION The present invention relates to a method for performing intra-RPC ALT in a wireless personal communications system.
The present invention also relates to a preferred data format for transferring information between a mobile subscriber unit and a radio port controller.
The method includes the steps of retuning a subscriber unit to a frequency for a new radio port.
The radio port controller transmits, via the radio port, an access rights message.
The subscriber unit reads the access rights messages including a frame counter variable included in the access rights message.
The subscriber unit sends an automatic link transfer (ALT) request message to the radio port controller via the radio port.
Following transmission of the ALT request message, and before receiving any reply from the radio port controller, the subscriber unit initiates encryption of voice or data information based on the frame counter variable received previously.
The radio port controller sends, via the radio port, a cipher started message and, upon receiving this message, the subscriber unit returns an ALT complete message.
In this manner, a handoff between RPs attached to a single RPC is accomplished with minimal voice or data loss due to the transfer.
Preferably, the voice loss is less than 20 milliseconds.
A preferred format of messaging for use in expedited ALT includes message structures having encryption information and link transfer information.
An access rights message includes a message type field, a complete port ID field and an encryption variable.
The encryption variable is designed to notify a subscriber unit of information necessary to begin resending voice messages during a handoff procedure.
In one embodiment, the encryption variable is a frame counter variable generated in the radio port controller.
According to another aspect of the present invention, an automatic link transfer (ALT) request message is provided.
The ALT request message is configured such that a message type information element precedes a RCID
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