EP0903873A1
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Frame synchronization system between base stations of mobile radio communication system and base station device employing this system
Assignee: Toshiba Corp
•
Filing: 1997-12-26
•
Granted: —
•
Expires: 2017-12-26
Abstract
Abstract A frame synchronization system between base stations of a mobile radio communication system comprising at least one main base station and a plurality of subsidiary base stations, wherein the main base station has a time information receiving means for receiving time information of high precision supplied from outside, a reference frame timing generating means for generating a reference frame timing on the basis of the time information, and a first control channel signal transmitting means for transmitting a control channel signal to the plurality of subsidiary base stations located synchronously with the reference frame timing, and the subsidiary base station has a local frame timing generating means for generating a local frame timing based on the receiving timing of a control channel signal transmitted from the main base station or other subsidiary base stations, and a second control channel signal transmitting means for transmitting a control channel signal synchronously with the local frame timing.
Inventors
- 👤 Haruki Yahata
- 👤 Katsuhiko Mishima
- 👤 Satoru Tsujimura
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-24 19:22
CPC Classifications
H; H04; H04B; H04B7/00; H04B7/24; H04B7/26; H04B7/2662; H04B7/2671; H04B7/2678; H04B7/2687; H04B7/269
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
345 words
An inter-base-station frame synchronous system
in a mobile communication system comprising: plural base stations dispersively arranged within
a service area and connected to a communication network,
and having at least one master base station and plural
slave base stations; and plural mobile stations wirelessly connected to
said plural base stations by a time-division
bidirectional multiplex system, wherein said master base station comprises: time information receiving means for receiving
time information with high precision externally
supplied; reference frame timing generating means for
generating reference frame timing for said time-division
multiplex connection in synchronization with
predetermined synchronous setting timing set on the
basis of said time information; and first control channel signal transmitting means
for transmitting a control channel signal to said
plural slave base stations located around its own
station in synchronization with said reference frame
timing, wherein said slave base stations comprise: control channel signal observation period setting
means in which a predetermined period from a first
receiving time point of a control channel signal
transmitted from said master base station or other
slave base stations during said frame synchronization
control period is set to a control channel signal
observation period; its own station frame timing generating means for
generating its own station frame timing on the basis of
receiving timing of the control channel signal
transmitted from said master base station or one of the
other slave base stations when only this control
channel signal is received during said control channel
signal observation period set by said control channel
signal observation period setting means, said its own
station frame timing generating means also generating
its own station frame timing on the basis of one of
receiving timings of control channel signals
respectively transmitted from said master base station
or plural slave base stations among the other slave
base stations when these control channel signals are
received during said control channel signal observation
period; and second control channel signal transmitting means
for transmitting each control channel signal in
synchronization with said its own station frame timing
after said control channel signal observation period is
terminated.
Claim 2
Dependent Claim
87 words
The inter-base-station frame synchronous
system of the mobile communication system according to
claim 1, wherein the its own station frame timing
generating means generates its own station frame timing
in synchronization with the frame timing of a most
advanced phase among plural frame timings based on the
respective receiving timings of the control channel
signals respectively transmitted from the master base
station or plural slave base stations among the other
slave base stations when these control channel signals
are received during the control channel signal
observation period.
Claim 3
Dependent Claim
109 words
The inter-base-station frame synchronous
system of the mobile communication system according to
claim 2, wherein, when the control channel signals
respectively transmitted from the master base station
or plural slave base stations among the other slave
base stations are received, the frame timing of a most
advanced phase among the plural frame timings based on
the respective receiving timings of these control
channel signals is discriminated as first frame timing
within a period set at a frame interval from a time
point shifted by a time about half this frame interval
from a first receiving time point of the control
channel signals during the control channel signal
observation period.
Claim 4
Dependent Claim
75 words
The inter-base-station frame synchronous
system of the mobile communication system according to
claim 1, wherein the its own station frame timing
generating means generates its own station frame timing
based on receiving timing at a maximum receiving level
among the control channel signals respectively
transmitted from the master base station or plural
slave base stations among the other slave base stations
when these control channel signals are received during
the control channel signal observation period.
Claim 5
Dependent Claim
75 words
The inter-base-station frame synchronous
system of the mobile communication system according to
any one of claims 1, 2, or 4, wherein, when the
communication between base and mobile stations is
approximately performed at the same time point as the
beginning of the ordinary frame synchronization control
period, the frame synchronous system further comprises
frame synchronous starting extending means for setting
a frame synchronous control period after the
communication between base and mobile stations is
terminated.
Claim 6
Dependent Claim
58 words
The inter-base-station frame synchronous
system of the mobile communication system according to
claim 5, wherein said second control channel signal
transmitting means adds information showing whether the
communication between base and mobile stations is
performed or not or information showing whether it is
suitable as reference of the frame synchronous control
or not to the control channel signal.
Claim 7
Dependent Claim
68 words
The inter-base-station frame synchronous
system of the mobile communication system according to
claim 6, wherein said its own station frame timing
generating means generates its own station frame timing
based on the receiving timing of only a control channel
signal to which information showing that the
communication between base and mobile stations is
performed or information prohibiting becoming to
reference of the frame synchronous control, is not
added.
Claim 8
Dependent Claim
50 words
The inter-base-station frame synchronous
system of the mobile communication system according to
any one of claims 1, 2, or 4, wherein the frame
synchronous system further comprises talking connection
request reception inhibiting means for inhibiting the
reception of a talking connection request in at least a
frame synchronous control period.
Claim 9
Dependent Claim
79 words
The inter-base-station frame synchronous
system of the mobile communication system according to
any one of claims 1, 2, or 4, wherein said second
control channel signal transmitting means comprises: control channel signal generating means for
generating the control channel signal in
synchronization with the frame timing of its own
station; and timing adjusting means for variably setting
transmitting timing of the control channel signal
generated by said control channel signal generating
means on the basis of supposed delay information.
Claim 10
Dependent Claim
126 words
The inter-base-station frame synchronous
system of the mobile communication system according to
claim 9, wherein said timing adjusting means variably
or fixedly sets said transmitting time such that a
total time of a propagation delay time from a base
station transmitting the control channel signal to its
own station, a detecting time required from a receiving
time point of this control channel signal to the
detection of frame timing shown by this control channel
signal, a generating time required from a detecting
time point of this frame timing to the generation of
its own station frame timing, and a transmitting time
until the control channel signal is transmitted in
synchronization with this generated its own station
frame timing, is an substantially integer times a frame
period.
Claim 11
Dependent Claim
33 words
The inter-base-station frame synchronous
system of the mobile communication system according to
claim 10, wherein said propagation delay time is
fixedly set to zero or a predetermined value in each
slave base station.
Claim 12
Dependent Claim
50 words
The inter-base-station frame synchronous
system of the mobile communication system according to
claim 10, wherein said timing adjusting means presumes
the propagation delay time of the control channel
signal used to generate its own station frame timing on
the basis of a receiving level of the received control
channel signal.
Claim 13
Dependent Claim
41 words
The inter-base-station frame synchronous
system of the mobile communication system according to
claim 12, wherein the transmitting level of the control
channel signal is set to the same level in each of the
master base station and the slave base stations.
Claim 14
Dependent Claim
70 words
The inter-base-station frame synchronous
system of the mobile communication system according to
claim 10, wherein said timing adjusting means presumes
the propagation delay time of the control channel
signal used to generate its own station frame timing on
the basis of a receiving level of the received control
channel signal and information showing a transmitting
level transmitted from a base station on a transmitting
side in this control channel signal.
Claim 15
Dependent Claim
133 words
The inter-base-station frame synchronous
system of the mobile communication system according to
claim 10, further comprising transmitting level
information storing means for storing transmitting
level information showing a transmitting level of the
control channel signal in each of said plural base
stations, wherein in the received control channel signal used to
generate its own station frame timing, said timing
adjusting means judges the transmitting level of said
received control channel signal with reference to the
transmitting level information stored to said
transmitting level information storing means on the
basis of discriminating information of a base station
on a transmitting side transmitted from the base
station on the transmitting side in said control
channel signal, and presumes the propagation delay time
of this control channel signal from said transmitting
level and the receiving level.
Claim 16
Dependent Claim
205 words
A base station apparatus dispersively arranged
within a service area and used as a slave base station
among plural base stations wirelessly connected to
plural mobile stations by a time-division bidirectional
multiplex system, the base station apparatus
comprising: control channel signal observation period setting
means in which a predetermined period from a first
receiving time point of a control channel signal
transmitted from other base stations is set to a
control channel signal observation period; its own station frame timing generating means for
generating its own station frame timing on the basis of
receiving timing of the control channel signal
transmitted from one of said other base stations when
only this control channel signal is received during
said control channel signal observation period, said
its own station frame timing generating means also
generating its own station frame timing on the basis of
one of receiving timings of control channel signals
respectively transmitted from plural base stations
among said other base stations when these control
channel signals are received during said control
channel signal observation period; and control channel signal transmitting means for
transmitting each control channel signal in
synchronization with said its own station frame timing
after said control channel signal observation period is
terminated.
References Cited (Backward Citations)
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