Frame synchronization for a mobile communication system
AssigneeLG Electronics Inc.
InventorSeok-Il Chang
Life of this patent
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Abstract
Methods and system for frame synchronization for a mobile communication system is disclosed. A downlink synchronization signal is detected. Multiple sub-frames on the basis of the detected synchronization signal are stored. An optimum position of a midamble sequence is detected using a correlation in accordance with sub-frames. A phase sequence of sub-frames is calculated by using a correlation value at the optimum position of the midamble sequence and a maximum correlation value of a synchronization signal. A frame synchronization is obtained on the basis of a phase position of a sub-frame. The frame synchronization is periodically updated.
Claims23
A method to synchronize frames for establishing a connection in a mobile communication system, the method comprising:
- providing a synchronization signal having a pre-determined number of sub-frames;
- providing a midamble sequence for correlating communication in a connection;
- calculating a first phase sequence using an optimum position for the midamble sequence based on the predetermined number of sub-frames and an optimum position for the synchronization signal based on the predetermined number of sub-frames;
- providing a second phase sequence comprising a defined phase sequence;
- calculating a maximum correlation value for a phase position of the pre-determined number of sub-frames using the first phase sequence and the second phase sequence;
- and
- obtaining frame synchronization using the maximum correlation value of the phase position.
A frame synchronization method for establishing connection and for receiving signals from a first terminal to a second terminal of a mobile communication system, the method comprising:
- detecting a synchronization signal having a plurality of sub-frames transmitted from the first terminal to the second terminal, each sub-frame having a midamble sequence;
- storing successive sub-frames of the plurality of sub-frames at the second terminal, each of the stored sub-frames having a frame number;
- detecting an optimum position of a midamble sequence based on a frame number from the stored sub-frames;
- calculating a phase sequence using a correlation value of the optimum position of the midamble sequence based on the stored sub-frames and a correlation value of the synchronization signal based on the stored plurality of sub-frames;
- obtaining frame synchronization on the basis of a phase position of a stored sub-frame having a maximum correlation value calculated by periodically correlating the calculated phase sequence and a defined phase sequence.
A mobile communication device for managing messages received from and transmitted to another user by a user of the mobile communication device, the mobile communication device comprising:
- an RF module comprising a transmitter to send the transmitted messages from a user and a receiver for receiving messages from another user;
- means for storing a predetermined number of successive sub-frames;
- means for detecting an optimum position of a midamble sequence by sub-frames;
- means for detecting an optimum position of a synchronization signal by sub-frames;
- means for calculating a phase sequence by using the optimum position of the midamble sequence and the optimum position of the synchronization signal by sub-frames;
- means for calculating a maximum correlation value between the phase sequence and a defined phase sequence;
- and
- means for obtaining a frame synchronization on the basis of a phase position of a sub-frame having the maximum correlation value.
A network for radio communication in a mobile communication system, the network comprising:
- a transmitter for transmitting a communication signal to a receiver;
- means for detecting a synchronization signal having a plurality of sub-frames transmitted from a first terminal to a second terminal;
- means for storing successive sub-frames of the plurality of sub-frames at the second terminal, each of the stored sub-frames having a frame number;
- means for detecting an optimum position of a midamble sequence based on a frame number from the stored sub-frames;
- means for calculating a phase sequence using a correlation value of the optimum position of the midamble sequence based on the stored sub-frames and a correlation value of the synchronization signal based on the stored sub-frames;
- means for obtaining frame synchronization of the transmitted signal on the basis of a phase position of a stored sub-frame having a maximum correlation value calculated by periodically correlating the calculated phase sequence and a defined phase sequence.
Dependencies are inferred from the claim text.