Inter-station transmission method, radio base station monitoring method, and device using the method
First Claim
1. An inter-station transmission method used in a mobile communication system comprising a mobile station and a base station operable to return, to the mobile station by means of a TDMA system, a response packet, the response packet being returned by the base station in response to a packet received from the mobile station, and the response packet being returned within a same time slot used for receiving the response packet,wherein the base station includes:
- a radio base station operable to demodulate an uplink packet signal received from the mobile station and extract uplink transmission data, and operable to modulate downlink transmission data to be transmitted to the mobile station and generate a downlink packet signal;
a communication control station operable to receive the uplink transmission data from the radio base station, generate downlink transmission data corresponding to the uplink transmission data received from the radio base station and transmit the generated downlink transmission data to the radio base station; and
an inter-station transmission path that establishes a wired connection between the radio base station and the communication control station, andwherein the inter-station transmission method includes;
in the radio base station, transmitting the uplink transmission data from the radio base station to the communication control station, the uplink transmission data being transmitted in a TDMA frame format used for a radio link between the radio base station and the mobile station;
transmitting the downlink transmission data, in the TDMA frame format, from the communication control station to the radio base station in accordance with a predetermined communication control station transmission clock, wherein the downlink transmission data includes a channel data packet, which is within the TDMA frame, to be transmitted inserted therein, and includes dummy data for reproducing a radio base station reception clock inserted therein in a period in which the channel data packet to be transmitted is not present;
in the communication control station, processing the uplink transmission data received from the radio base station in the TDMA frame format;
in the radio base station, reproducing the radio base station reception clock synchronized with the predetermined communication control station transmission clock, the radio base station reception clock being reproduced from the downlink transmission data received from the communication control station; and
in the radio base station, processing the downlink transmission data using the radio base station reception clock.
6 Assignments
0 Petitions
Accused Products
Abstract
A inter-station transmission method of extending time allocated for a transmission path delay of an inter-station transmission path within a predetermined turnaround time, and increasing an inter-station transmission distance. A radio base station reproduces a clock synchronized with a BSU transmission clock DCLK used when transmitting downlink transmission data from a communication control station. The radio base station processes the downlink transmission data. The clock synchronization eliminates a necessity of data format conversion between the communication control station and the radio base station, a buffer accumulating transmission data in preparation for the conversion is not necessary. This reduces a turnaround time of a mobile communication system. When the inter-station transmission method is applied to dedicated short-range communications, having a fixed turnaround time, a distance between the communication control station and the radio base station can be increased by a distance according to the eliminated delay time.
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Citations
12 Claims
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1. An inter-station transmission method used in a mobile communication system comprising a mobile station and a base station operable to return, to the mobile station by means of a TDMA system, a response packet, the response packet being returned by the base station in response to a packet received from the mobile station, and the response packet being returned within a same time slot used for receiving the response packet,
wherein the base station includes: -
a radio base station operable to demodulate an uplink packet signal received from the mobile station and extract uplink transmission data, and operable to modulate downlink transmission data to be transmitted to the mobile station and generate a downlink packet signal; a communication control station operable to receive the uplink transmission data from the radio base station, generate downlink transmission data corresponding to the uplink transmission data received from the radio base station and transmit the generated downlink transmission data to the radio base station; and an inter-station transmission path that establishes a wired connection between the radio base station and the communication control station, and wherein the inter-station transmission method includes; in the radio base station, transmitting the uplink transmission data from the radio base station to the communication control station, the uplink transmission data being transmitted in a TDMA frame format used for a radio link between the radio base station and the mobile station; transmitting the downlink transmission data, in the TDMA frame format, from the communication control station to the radio base station in accordance with a predetermined communication control station transmission clock, wherein the downlink transmission data includes a channel data packet, which is within the TDMA frame, to be transmitted inserted therein, and includes dummy data for reproducing a radio base station reception clock inserted therein in a period in which the channel data packet to be transmitted is not present; in the communication control station, processing the uplink transmission data received from the radio base station in the TDMA frame format; in the radio base station, reproducing the radio base station reception clock synchronized with the predetermined communication control station transmission clock, the radio base station reception clock being reproduced from the downlink transmission data received from the communication control station; and in the radio base station, processing the downlink transmission data using the radio base station reception clock. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A radio base station monitoring method used in a mobile communication system comprising a mobile station and a base station operable to return, to the mobile station by means of a TDMA system, a response packet, the response packet being returned by the base station in response to a packet received from the mobile station, and the response packet being returned within a same time slot used for receiving the response packet,
wherein the base station includes: -
a radio base station operable to demodulate an uplink packet signal received from the mobile station and extract uplink transmission data, and operable to modulate downlink transmission data to be transmitted to the mobile station and generate a downlink packet signal; a communication control station operable to receive the uplink transmission data from the radio base station, generate downlink transmission data corresponding to the uplink transmission data received from the radio base station and transmit the generated downlink transmission data to the radio base station; and an inter-station transmission path that establishes a wired connection between the radio base station and the communication control station, and wherein the radio base station monitoring method includes; in the radio base station, generating monitoring data for notifying a state of the radio base station to the communication control station; in the radio base station, time division multiplexing the monitoring data into the uplink transmission data with a slot timing that is only allocated to a downlink; in the radio base station, transmitting the uplink transmission data and the monitoring data to the communication control station, the uplink transmission data and the monitoring data being transmitted in a TDMA frame format used for a radio link between the radio base station and the mobile station; in the communication control station, transmitting the downlink transmission data, in the TDMA frame format, from the communication control station to the radio base station in accordance with a predetermined communication control station transmission clock, wherein the downlink transmission data includes a channel data packet, which is within the TDMA frame, to be transmitted inserted therein, and includes dummy data for reproducing a radio base station reception clock inserted therein in a period in which the channel data packet to be transmitted is not present; in the communication control station, processing the uplink transmission data received from the radio base station in the TDMA frame format; in the communication control station, monitoring the state of the radio base station using the monitoring data; in the radio base station, reproducing the radio base station reception clock synchronized with the predetermined communication control station transmission clock, the radio base station reception clock being reproduced from the downlink transmission data received from the communication control station; and in the radio base station, processing the downlink transmission data using the radio base station reception clock.
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10. A mobile communication system comprising a mobile station and a base station operable to return, to the mobile station by means of a TDMA system, a response packet, the response packet being returned by the base station in response to a packet received from the mobile station, and the response packet being returned within a same time slot used for receiving the response packet,
wherein the base station includes: -
a radio base station operable to demodulate an uplink packet signal received from the mobile station and extract uplink transmission data, and operable to modulate downlink transmission data to be transmitted to the mobile station and generate a downlink packet signal; a communication control station operable to receive the uplink transmission data from the radio base station, generate downlink transmission data corresponding to the uplink transmission data received from the radio base station and transmit the generated downlink transmission data to the radio base station; and an inter-station transmission path that establishes a wired connection between the radio base station and the communication control station, wherein the radio base station transmits, to the communication control station, the uplink transmission data, the uplink transmission data being transmitted in a TDMA frame format used for a radio link between the radio base station and the mobile station, wherein the communication control station processes the uplink transmission data received from the radio base station, in the TDMA frame format, and transmits, to the radio base station, the downlink transmission data in the TDMA frame format, wherein the radio base station processes the downlink transmission data received from the communication control station, in the TDMA frame format, wherein the communication control station includes; a signal generating unit operable to generate (i) a communication control station transmission clock for providing a transmission timing of the downlink transmission data and (ii) a communication control station reception clock for providing a reception timing of the uplink transmission data; a data generating unit operable to (i) generate the downlink transmission data including a channel data packet, which is within the TDMA frame, to be transmitted inserted therein, and including dummy data for reproducing a radio base station reception clock inserted therein in a period in which the channel data packet to be transmitted is not present, and (ii) transmit the downlink transmission data to the radio base station, in accordance with the communication control station transmission clock; and a reception unit operable to receive, in accordance with the communication control station reception clock, the uplink transmission data, and wherein the radio base station includes; a reproduction unit operable to reproduce, from the downlink transmission data received from the communication control station, a radio base station reception clock and a radio base station transmission clock, the radio base station reception clock and the radio base station transmission clock being synchronized with the communication control station transmission clock; and a radio unit operable to (i) process the downlink transmission data using the radio base station reception clock reproduced in the reproduction unit and (ii) process the uplink transmission data using the radio base station transmission clock reproduced in the reproduction unit. - View Dependent Claims (11, 12)
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Specification