Method for switching a communications link to another channel (handover)
AssigneeSiemens Aktiengesellschaft
InventorsJuergen Schindler, Egon Schulz
Life of this patent
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Abstract
The invention relates to a method for switching a communications link to another channel (handover) in a digital cellular mobile radio systems and a mobile radio system, the time of the handover being determined by a decision algorithm. Roughly generalized, the changeover to a new channel can take place between two radio systems or frequency bands within a radio system (external handover), between two radio cells within a cellular network (intercell handover) or within a radio cell (intracell handover). Each handover case, in turn, can include various type of handover.
Claims11
A method for switching a communications link to another channel (handover) within or between mobile radio systems, comprising:
- splitting data to be transmitted into frames of identical length and interleaved;
- and
- determining a time of handover using a decision algorithm, wherein the handover occurs after a complete frame has been transmitted,
- wherein a flag marks an interleaving depth to be considered in the handover and the handover is carried out at least partially based on the interleaving depth.
A method for switching a communications link to another channel (handover) within or between mobile radio systems, comprising:
- splitting data to be transmitted into frames of identical length and interleaved;
- and
- determining a time of handover using a decision algorithm,
- wherein the handover occurs after a complete frame has been transmitted, wherein during data transmissions in TDMA systems, handover occurs after transmission of a TDMA frame with a TDMA frame number wherein
- (TDMA frame number−starting TDMA frame number+1) modulo interleaving depth=0.
A method for switching a communications link to another channel (handover) within or between mobile radio systems, comprising:
- splitting data to be transmitted into frames of identical length and interleaved;
- and
- determining a time of handover using a decision algorithm,
- wherein in the case of voice links, a first data block of a voice frame is transmitted in an odd-numbered TDMA frame and the second data block of a voice frame is transmitted in an even-numbered TDMA frame and the handover is performed after an even-numbered TDMA frame has been transmitted.
A method for switching a communications link to another channel (handover) within or between mobile radio systems, comprising:
- splitting data to be transmitted into frames of identical length and interleaved;
- and
- determining a time of handover using a decision algorithm,
- wherein in the case of a transmission of a voice or data frame over n time slots, a first block of the voice frame is transmitted in an even-numbered TDMA frame and a second block of the voice or data frame is transmitted in an odd-numbered TDMA frame and the handover is performed after an odd-numbered TDMA frame has been transmitted.
A method for switching a communications link to another channel (handover) within or between mobile radio systems with packet access, comprising:
- determining a time of handover using a decision algorithm,
- wherein the handover occurs after a complete segment or a self-contained packet has been transmitted, and
- wherein during data transmissions in TDMA systems, handover occurs after transmission of a TDMA frame with a TDMA frame number wherein
- (TDMA frame number−starting TDMA frame number+1) modulo interleaving depth=0.
A digital cellular mobile radio system having a network and mobile stations, comprising:
- a device to switching a communications link to another channel (handover) which uses a decision algorithm with respect to a time of handover, the handover occurring after a complete voice or data frame has been transmitted,
- wherein during data transmissions in TDMA systems, handover occurs after transmission of a TDMA frame with a TDMA frame number wherein
- (TDMA frame number−starting TDMA frame number+1) modulo interleaving depth=0.
Dependencies are inferred from the claim text.