EP1104974A2
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Mobile telecommunication system and method for performing handoff between asynchronous base station and synchronous base station
Assignee: SK Hynix Inc
•
Filing: 2000-11-07
•
Granted: —
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Expires: 2020-11-07
Abstract
Abstract A mobile telecommunication system for performing a handoff from an asynchronous communication system to a synchronous communication system includes: at least one asynchronous base station (310); at least one synchronous base station (320) neighbouring to the asynchronous base station, wherein the synchronous base station transmits channel signals; at least one dual-mode mobile station (300) for selectively communicating with the synchronous base station and the asynchronous base station; and a reception unit (330), coupled to the asynchronous base station, for receiving and decoding the channel signals to transmit decoded signals to the asynchronous base station, wherein the asynchronous base station transmits the decoded signals to the dual-mode mobile station, thereby performing a handoff operation. <IMAGE>
Inventors
- 👤 Jae-Hong Park
- 👤 Chong-Won Lee
- 👤 Yu-Ro Lee
- 👤 Ho-Geun Lee
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-30 12:50
CPC Classifications
H; H04; H04W; H04W36/00; H04W36/0005; H04W36/0055; H04W36/0066
Claims Analysis
Total Claims: 35
Claim 1
Independent Claim
109 words
A mobile telecommunication system for performing a
handoff from an asynchronous communication system to a
synchronous communication system, comprising: at least one asynchronous base station; at least one synchronous base station neighboring to the
asynchronous base station, wherein the synchronous base
station transmits channel signals; at least one dual-mode mobile station for selectively
communicating with the synchronous base station and the
asynchronous base station; and a reception means, coupled to the asynchronous base
station, for receiving and decoding the channel signals to
transmit decoded signals to the asynchronous base station,
wherein the asynchronous base station transmits the decoded
signals to the dual-mode mobile station, thereby performing a
handoff operation.
Claim 2
Dependent Claim
24 words
The mobile telecommunication system as recited in
claim 1, wherein the asynchronous base station is a wideband
code division multiple access (W-CDMA) telecommunication
system.
Claim 3
Dependent Claim
32 words
The mobile telecommunication system as recited in
claim 1, wherein the synchronous base station is one of 2
generation (2G) system based on IS-95 and 3 generation (3G)
system based on IS-2000.
Claim 4
Dependent Claim
128 words
The mobile telecommunication system as recited in
claim 1, wherein the reception means is an extended receiver,
the extended receiver including: an external signal receiving means for receiving a pilot
signal and a Sync signal transmitted from the synchronous base
station; an external signal decoding means for decoding the pilot
signal and the Sync signal transmitted from the external
signal receiving means, to output decoded signals to the
asynchronous base station, wherein the decoded signals include
a long code state, a neighbor list, and a time related
information of the synchronous base station; and a control means for controlling a status and an operation
of the external signal receiving means and the external signal
decoding means in response to a control signal outputted from
the asynchronous base station.
Claim 5
Dependent Claim
121 words
The mobile telecommunication system as recited in
claim 1, wherein the reception means is a global positioning
system (GPS) signal receiver, the global positioning system
(GPS) signal receiver including: an external signal receiving means for receiving a GPS
signal from a GPS satellite; an external signal decoding means for decoding the GPS
signal to obtain a long code state and a time related
information of the synchronous base station, wherein the long
code state and the time related information are transmitted to
the asynchronous base station; and a control means for controlling a status and an operation
of the external signal receiving means and the external signal
decoding means in response to a control signal outputted from
the asynchronous base station.
Claim 6
Dependent Claim
25 words
The mobile telecommunication system as recited in
claim 5, wherein a neighbor list is informed from a core
network connected with the asynchronous base station.
Claim 7
Dependent Claim
33 words
The mobile telecommunication system as recited in
claim 1, wherein the decoded signals are transmitted to the
dual-mode mobile station over one of a broadcasting signal, a
phasing signal, and a dedicated signal.
Claim 8
Dependent Claim
28 words
The mobile telecommunication system as recited in
claim 7, wherein the dual-mode mobile station searches
neighboring synchronous base station to be handed off by using
the decoded signals.
Claim 9
Dependent Claim
30 words
The mobile telecommunication system as recited in
claim 1, wherein the asynchronous base station transmits a
long code state to the dual-mode mobile station over an
acquisition indicator channel (AICH).
Claim 10
Dependent Claim
28 words
The mobile telecommunication system as recited in
claim 9, wherein the acquisition indicator channel (AICH)
includes 15 access slots in 2 frames, each slot having 4
unused bits.
Claim 11
Dependent Claim
35 words
The mobile telecommunication system as recited in
claim 10, wherein the information of the long code state is
inserted into the acquisition indicator channel (AICH) with a
cyclic redundancy check (CRC) code of 12 bits.
Claim 12
Dependent Claim
49 words
The mobile telecommunication system as recited in
claim 1, wherein the asynchronous base station transmits a
long code state over a physical channel, the physical channel
including a first portion for transmitting a pilot signal one
time and a second portion for transmitting the long code state
two times.
Claim 13
Dependent Claim
21 words
The mobile telecommunication system as recite in
claim 1, wherein neighboring asynchronous base stations have
different absolute times from each other.
Claim 14
Dependent Claim
97 words
The mobile telecommunication system as recited in
claim 13, wherein the absolute times of the neighboring
asynchronous base stations is as follows: t i = T + T offset,i where, i is an integer, t i is an absolute time of i-th asynchronous base station, T is a reference time of an asynchronous base station,
and T offset,i is an offset time designated from an upper layer, wherein the offset time is an arbitrary value except for a
value corresponding to N times of chips per slot assigned to
the asynchronous base station, N being an integer.
Claim 15
Independent Claim
202 words
A method for performing a handoff from an
asynchronous communication system to a synchronous
communication system in a mobile telecommunication system,
wherein the mobile telecommunication system includes at least
one asynchronous base station; at least one synchronous base
station neighboring to the asynchronous base station, wherein
the synchronous base station transmits channel signals; at
least one dual-mode mobile station for selectively
communicating with the synchronous base station and the
asynchronous base station; and a reception means, coupled to
the asynchronous base station, for receiving and decoding the
channel signals to transmit decoded signals to the
asynchronous base station, wherein the asynchronous base
station transmits the decoded signals to the dual-mode mobile
station, the method comprising the steps of: a) receiving the channel signals; b) communicating with the dual-mode mobile station
operating in an asynchronous mode; c) searching neighboring asynchronous base stations to be
handed off; d) if there is no neighboring asynchronous base station
to be handed off, transmitting a power monitoring command to
the dual-mode mobile station; e) transmitting decoded signals to the dual-mode mobile
station; f) performing a power monitoring operation and report
monitored result to the asynchronous base station; and g) performing a handoff to the synchronous base station.
Claim 16
Dependent Claim
31 words
The method as recited in claim 15, further, after the
step a), comprising the step of: h) performing an initialization for setting up an
absolute time of the asynchronous base station.
Claim 17
Dependent Claim
99 words
The method as recited in claim 16, wherein the step
h) includes the steps of: h1) receiving an offset time from an upper layer, wherein
each of asynchronous base stations has different offset times
from each other, and wherein the offset time is an arbitrary
value except for a value corresponding to N times of chips per
slot, N being an integer; h2) obtaining an absolute time of neighboring synchronous
base station; and h3) setting up the absolute time of the asynchronous base
station by using the absolute time of the neighboring
synchronous base station and the offset time.
Claim 18
Dependent Claim
63 words
The method as recited in claim 17, wherein each
absolute time of asynchronous base stations is as follows: t i = T + T offset,i where, i is an integer, t i is an absolute time of i-th asynchronous base station, T is a reference time of an asynchronous base station,
and T offset,i is an offset time designated from an upper layer.
Claim 19
Dependent Claim
35 words
The method as recited in claim 15, if there is a
synchronous base station to be handed off, further comprising
the step of performing a handoff to corresponding synchronous
base station to be handed off.
Claim 20
Dependent Claim
67 words
The method as recited in claim 15, wherein the step
f) includes the steps of: f1) transmitting a power monitoring command and the
information associated with the synchronous base station from
the asynchronous base station to the dual-mode mobile station; f2) obtaining a power of a pilot channel of synchronous
base stations in the neighbor list; and f3) reporting the pilot offset to the asynchronous base
station.
Claim 21
Dependent Claim
18 words
The method as recited in claim 20, wherein the power
monitoring operation is performed during a compressed mode.
Claim 22
Dependent Claim
33 words
The method as recited in claim 15, wherein the step
g) is performed by selecting one synchronous base station to
be handed off by using a pilot channel signal having a maximum
value.
Claim 23
Dependent Claim
41 words
The method as recited in claim 15, wherein the step
g) includes the steps of: g1) transmitting a handoff required message to a core
network; and g2) transmitting a handoff request message to the
synchronous base station to be handed off.
Claim 24
Dependent Claim
22 words
The method as recited in claim 15, wherein the
asynchronous base station is a wideband code division multiple
access (W-CDMA) telecommunication system.
Claim 25
Dependent Claim
30 words
The method as recited in claim 15, wherein the
synchronous base station is one of 2 generation (2G) system
based on IS-95 and 3 generation (3G) system based on IS-2000.
Claim 26
Dependent Claim
126 words
The method as recited in claim 15, wherein the
reception means is an extended receiver, the extended receiver
including: an external signal receiving means for receiving a pilot
signal and a Sync signal transmitted from the synchronous base
station; an external signal decoding means for decoding the pilot
signal and the Sync signal transmitted from the external
signal receiving means, to output decoded signals to the
asynchronous base station, wherein the decoded signals include
a long code state, a neighbor list, and a time related
information of the synchronous base station; and a control means for controlling a status and an operation
of the external signal receiving means and the external signal
decoding means in response to a control signal outputted from
the asynchronous base station.
Claim 27
Dependent Claim
119 words
The method as recited in claim 15, wherein the
reception means is a global positioning system (GPS) signal
receiver, the global positioning system (GPS) signal receiver
including: an external signal receiving means for receiving a GPS
signal from a GPS satellite; an external signal decoding means for decoding the GPS
signal to obtain a long code state and a time related
information of the synchronous base station, wherein the long
code state and the time related information are transmitted to
the asynchronous base station; and a control means for controlling a status and an operation
of the external signal receiving means and the external signal
decoding means in response to a control signal outputted from
the asynchronous base station.
Claim 28
Dependent Claim
30 words
The method as recited in claim 27, wherein the
asynchronous base station obtains a neighbor list associated
with synchronous base station from a core network connected
with asynchronous base station.
Claim 29
Dependent Claim
31 words
The method as recited in claim 15, wherein the
decoded signals are transmitted to the dual-mode mobile
station over one of a broadcasting signal, a phasing signal,
and a dedicated signal.
Claim 30
Dependent Claim
26 words
The method as recited in claim 29, wherein the dual-mode
mobile station searches neighboring synchronous base
station to be handed off by using the decoded signals.
Claim 31
Dependent Claim
28 words
The method as recited in claim 15, wherein the
asynchronous base station transmits a long code state to the
dual-mode mobile station over an acquisition indicator channel
(AICH).
Claim 32
Dependent Claim
26 words
The method as recited in claim 31, wherein the
acquisition indicator channel (AICH) includes 15 access slots
in 2 frames, each slot having 4 unused bits.
Claim 33
Dependent Claim
33 words
The method as recited in claim 32, wherein the
information of the long code state is inserted into the
acquisition indicator channel (AICH) with a cyclic redundancy
check (CRC) code of 12 bits.
Claim 34
Dependent Claim
47 words
The method as recited in claim 33, wherein the
asynchronous base station transmits a long code state over a
physical channel, the physical channel including a first
portion for transmitting a pilot signal one time and a second
portion for transmitting the long code state two times.
Claim 35
Dependent Claim
136 words
The method as recited in claim 34, wherein a method
for transmitting the long code state over the physical channel
includes the steps of: h) receiving a long code state of 50 bits through the
physical channel, and adding a CRC code of 12 bits; i) performing a CRC coding operation to output a CRC-coded
data of 62 bits; j) receiving the CRC-coded data and adding data of 8 bits
in a tail portion of the CRC-coded data to output a data of 70
bits; k) performing a convolution encoding to the data of 70
bits to output a data of 140 bits; l) performing an interleaving operation to the data of
140 bits to output an interleaved long code state to the dual-mode
mobile station; and m) repeating the steps h) to l) two times.
References Cited (Backward Citations)
No citation records indexed.
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