Method for synchronizing clocks in a communication system
AssigneeElectronics and Telecommunications Research Insti tute
InventorsHoo-Sung Lee, Woo-Yong Lee, Hyun-Kyu Chung
Life of this patent
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Abstract
A method for clock synchronization between higher layers using synchronization information provided from lower layers in multi-clock communication system in which the higher layers and the lower layers use heterogeneous clocks is provided.
Claims15
A method for clock synchronization between a first communication protocol and a second communication protocol, each of the first communication protocol and the second communication protocol comprising a protocol adaptation layer (PAL) as a higher layer and a media access control/physical (MAC/PHY) layer as a lower layer, the method comprising:
- transmitting information from the PALs to the MAC/PHY layers for communication between the first communication protocol and the second communication protocol wherein the information is required for establishing a connection between the MAC/PHY layers;
- establishing a connection between the MAC/PHY layers using the transmitted information and achieving synchronization between the MAC/PHY layers;
- transmitting a synchronization signal from the synchronized MAC/PHY layers to each of the PALs based on the information required for establishing the connection, and storing, at each of the PALs, synchronization information at the time of receiving the synchronization signal;
- and
- transmitting synchronization information of the PAL of the first communication protocol to the PAL of the second communication protocol, and adjusting a clock of the PAL of the second communication protocol by comparing the transferred synchronization information with synchronization information of the PAL of the second communication protocol.
A method for clock synchronization between higher layers using synchronization information of lower layers in a multimedia transmission/reception system that comprises a transmitting device and a receiving device, the method comprising:
- setting, at a protocol adaption layer (PAL) of each of the transmitting device and the receiving device, information required for connection between media access control/physical (MAC/PHY) layers as lower layers;
- connecting the MAC/PHY layers using the information required for connection, and achieving beacon period start time (BPST) synchronization by transmitting and receiving a beacon including a superframe;
- transmitting a synchronization signal to each of the PALs from the synchronized MAC/PHY layers based on the information required for connection, and storing, at each of the PAL, synchronization information at the time of receiving the BPST synchronization signal;
- and
- transmitting the synchronization information stored in the PAL of the transmitting device to the PAL of the receiving device, and adjusting a clock of the PAL of the receiving device by comparing the received synchronization information with the synchronization information of the PAL of the receiving device.
An apparatus for reproducing a clock for clock synchronization in a multimedia transmission/reception system, the apparatus comprising:
- a clock counter unit configured to store a clock count value at the time of receiving a beacon period start time (BPST) synchronization signal;
- a voltage control oscillating unit configured to generate a clock for multimedia data communication;
- and
- a control unit configured to control the voltage control oscillating unit by comparing a received clock count value with the stored clock count value.
Dependencies are inferred from the claim text.