Radio base station apparatus and synchronization method thereof
AssigneeFujitsu Limited
InventorsYutaka AOYAMA, Shigeaki KAWAMATA
Life of this patent
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Abstract
In a radio base station apparatus that connects a radio control device and plural radio devices to each other through plural links and transmits and receives data by using a frame, a synchronization unit calculates a difference between a first reference counter and a second reference counter from first and second transmission values and first and second reception values and corrects a count value of the second reference counter based on the difference so as to make the count value of the second reference counter coincide with a count value of the first reference counter.
Claims9
A radio base station apparatus that connects a radio control device and plural radio devices to each other through plural links and transmits and receives data by using a frame, the radio base station apparatus comprising:
- a first reference counter that counts a clock pulse of the radio control device or the radio device, each serving as a master;
- a second reference counter that counts a clock pulse of the radio device serving as a slave;
- a first-transmission-value holding unit that holds a count value of the first reference counter as a first transmission value when a first specific frame is transmitted from the master to the slave;
- a first-reception-value holding unit that holds a count value of the second reference counter as a first reception value when the first specific frame is received by the slave;
- a second-transmission-value holding unit that holds a count value of the second reference counter as a second transmission value when a second specific frame is transmitted from the slave to the master;
- a second-reception-value holding unit that holds a count value of the first reference counter as a second reception value when the second specific frame is received by the master;
- a transmission-and-reception-value transmitting unit that transmits the first transmission value and the second reception value from the master to the slave;
- and
- a synchronization unit that calculates a difference between the first reference counter and the second reference counter from the first and second transmission values and the first and second reception values and corrects a count value of the second reference counter based on the difference so as to make the count value of the second reference counter coincide with a count value of the first reference counter.
A synchronization method of a radio base station apparatus that connects a radio control device and plural radio devices to each other through plural links and transmits and receives data by using a frame, the synchronization method comprising:
- counting a clock pulse of the radio control device or the radio device each serving as a master with a first reference counter;
- counting a clock pulse of the radio device serving as a slave with a second reference counter;
- holding a count value of the first reference counter as a first transmission value when a first specific frame is transmitted from the master to the slave;
- holding a count value of the second reference counter as a first reception value when the first specific frame is received by the slave;
- holding a count value of the second reference counter as a second transmission value when a second specific frame is transmitted from the slave to the master;
- holding a count value of the first reference counter as a second reception value when the second specific frame is received by the master;
- transmitting the first transmission value and the second reception value from the master to the slave;
- calculating a difference between the first reference counter and the second reference counter from the first and second transmission values and the first and second reception values;
- and
- correcting a count value of the second reference counter based on the difference so as to make the count value of the second reference counter coincide with a count value of the first reference counter.
Dependencies are inferred from the claim text.