Note : Les descriptions sont présentées dans la langue officielle dans laquelle elles ont été soumises.
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P10686-RMOG
PROVISIONING OF GPS ASSISTANCE DATA
IN A WCDMA NETWORS
FIELD OF THE INVENTION
The present invention is generally related to wireless
communication networks, and more particularly to a wideband code
division multiple access (WCDMA) third generation (3G) network
for mobile positioning.
1 o BACgGROUND OF THE INVENTION
Wireless communication networks including fixed wireless
and cellular-type mobile communications networks continue to
evolve. There are several available technologies for providing
wireless communications including CDMA, TDMA, GSM, AMPS
and D-A1VIPS. These networks continue to be deployed throughout
the world. Many equipment suppliers throughout the world
currently manufacture these various systems and typically work
through standards groups to ensure commonality and
interoperability of the various networks.
2 0 As wireless communications networks move into the next
century, a new type of wireless network is evolving currently known
as wideband code division multiple access (WCDMA} based third
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generation'(3G) networks. These third generation wireless systems
are slowly becoming a reality for FPLMNs.
There is a desire to provide positioni_n.g of a mobile subscriber
within a wireless network. Current implementations are based on
tinge difference of arrival (TDOA) techniques, which give an
accuracy of position down to about 18 meters. An example of such
implementations is described in WO 96 15636 A
~G~Ay~S~g,S CQMMUNICATIONS, INC.) published 23
May 1996 entitled "Locating system and Method Using a Mobile
Communications Networl~' (hereinafter "WO 96 15636). WO 96
15636 describes a differential positioning system using a satellite-
based radio navigation system, such as NAVSTAR positioning
system to permit a mobile unit to determine its position. The
positioning techniques of WO 96 15636 involves measuring the
propagation times of position signals from the satellites. Also, with
WO 96 15636, a set of reference position receivers generate
correction date for improving the position fig of the mobile unit.
While the accuracy of prior positioning techniques, such as
the one described in WO 9615636, is adequate for several features
and can be implemented in today's networks, there is required more
accurate positioning of a mobile subscriber. Specifically, the
differential positioning system of WO 9615636 and other similar
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positioning techniques are inadequate for today's modern 3G
wireless network. An improved mobile-based positioning solution
will also reduce the need for extra capacity in the network required
and used for positioning. Development is still currently undervPay
with techniques being deliberated by standards committees to
determine how best achieve improved resolution of positioning of a
mobile station, especially in WCDMA based 3G networks.
g~l~lgy OF THE INVENTION
The present invention achieves technical advantages as a
method of provisioning differential GPS assistance data in a
WCDMA network over the dedicated physical data channel
(DPDC~, and/or the dedicated physical control channel (DPCC~.
By providing differential GPS assistance data over these channels,
mobile stations having a GPS receiver within a WCDMA based 3G
network can accurately determine position of the mobile station to
an accuracy of about 5 meters.
The mobile user terminal may comprise of a mobile cellular-
type mobile station, such as a PCS or cellular phone, but may also
2 0 include a computer, or a PDA.
The mobile communication terminal according to the present
invention includes mechanisms for exchanging wireless
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communications with a serving wireYess.communication network,
and in addition, means to receive clifferential GPS assistance data
over a dedicated physical channel, such as the DPDCH or DPCCH.
The mobile communication terminal further has circuitry and
s software in a GPS receiver to determine a position of the mobile
communication terminal as a fun~on of this GPS assistance data
with improved resolution.
BRIEF DESCRIPTION OF THE DRAWINGS
Figure 1 is a block diagram of a wireless communication
network including a WCDMA wireless network for third generation
systems;
Figure 2 is a flow diagram of a method of the present
invention providing differential GPS (DGPS) assistance data over
the DPDCH or DPCCH on a WCDMA. carrier to support differential
GPS positioning of a mobile station in the network;
Figure 3 is a block diagram of one format for providing
differential GPS assistance data over the DPCCH; and
Figure 4 is a block diagram of an alternative embodiment of
2 o the present invention providing differential GPS assistance data
over the DPDCH. ~ - -
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DESCRIPTION OF THE PREFTRI~ED EMBODIMENT
Figure 1 illustrates a block diagram. of a communication
network 10 according to the preferred embodiment of the present
invention. Communication network 10 preferably comprises a
wireless telephony network seen to include an originating mobile
station 12 coupled by an RF communication link to a servicing
WCDMA originating network 14. The originating mobile station 12
is preferably a wireless communication device comprising a wireless
mobile station. The originating WCDMA network 14 is seen to be
1 o coupled to a transit network or communication link 16, which may
comprise a public switched telephone network (PSTN), but could
also comprise of other networks including an optical network if
desired. The transit network 16 interfaces and communicates
electrical signals including digitized voice calls between originating
network 14 anal a terminating network 18. Terminating network 18
may be the same as, or different than, the originating network 14,
and map comprise of AMPS, D-AMPS, TDMA, GSM and IS-95
networks. For purposes of illustration, terminating network 18 is
depicted as a WCDMA network. Terminating network 18 is coupled
2 0 to and services via an RF link a terminating mobile station 20,
which may comprise of a fixed or mobile station such as a wireless ~ ,
cellular or PCS subscriber. The wireless stations and networks may
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have cvdecs to provide encoding and decoding of digital signals
communicated over the transit network I6.
The originating WCD~ network 14 is seen to include a base
transceiver station (BTS) 30 serving via a radio frequency (R~ link
s the originating mobile or feed station 12. Each BTS 30 services
multiple stations 12, although only one is shown for purposes of
illustration and clarity. Originating network 14 is further seen to
include a radio network controller (RNC) 32 and a network
switching system (NSS) 34. The BTS and RNC are sometimes
1o collectively referred to as a base switching station (BSS). RNC 32
interfaces voice calls between multiple BTSs 30 and NSS 34,
wherein RNC 32 typically serves multiple BTSs 30, although only
one is shown for. purposes of illustrating the present invention.
Similarly, NSS 34 services multiple RNCs 32, although only one is
15 shown for purposes of illustrating the present invention. NSS 34
includes a home location register (HLR), a mobile positioning node,
and a visitor location register (VLR.) which. includes and stores
various information of the stations 12 currently being served by the
originating network 14.
2 o Terminating network 18 is seen to include a BTS 40 serving
the terminating station 20, and typically serves multiple stations ~ ,
20. Terminating network 18 is further seen to include a RNC 42
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and NSS 44. Terminating network I8 may operate according to the
same operating protocol as originating network 14, i.e., both are
WCDMA networks, or, the terminating network 18 may be different
from the originating network 14, i.e., the originating network is
WCDMA anal the terminating network may be based on AMPS, D-
AMPS, GSM, TDMA or IS-9~ protocols. NSS 44 includes a I3LR.,
and a VLR for maintaining a register of information for all stations
20 currently being served by the terminating network 18. A
reference GPS receiver 46 provides GPS assistance data positioning
information to the respective network 14 and network I8, for use by
originating mobile station 12 according to the present invention.
Transit network 16 is preferably a PSTN. Originating NSS
34 and terminating NSS 44 ezchange digitized voice data thereover,
which are preferably encoded in pulse code modulation {PCM)
s5 format, and transmitted at about 64 kbps. Although PCM is a
preferred encoding format, other encoding formats are available
according to the present invention. Likewise, other transfer speeds
other that 64 kbps are also contemplated by the present invention.
Generally, the digitized voice data transferred over transit network
' 20 16 can be in any format which is compatible and supported by both
the originating network 14 and the terminating network 18. ~ ,
Referring now to Figure 2, there is illustrated at 50 a
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rnessrage flow diagram for providing differential GPS (DGPS) assistance data
from
reference GPS receiver 46 via transit network 16 to the user terminal 12. As
illustrated at 52, the DGPS assistance data is continuously provided by a node
of the
network t 0, such as the BTS 32, over the air interface to the user terminal
12 over
t0 either the dedicated physical data channel (DPDCH) or the dedicated
physical
controi channel (DPCCH).
At 54, there is illustrated a Poskioning Request message sent by the
RNC/Core network 32 to initiate positioning of user terminal 12_ This message
is
responsively forwarded by the BTSlnode B 30 to the user terminal 12 as
Positioning
Request message 5f3.
At 58, the user terminal 12 has an integrated GPS receiver that processes the
DGPS assistance data provided by the network 10 to determine the position or
aid in
the positioning of user terminal 12 using GPS satellite information according
to
techniques that are well known throughout the industry. The differential GPS
assistance data can be procasRad to speed the search of a priori information
from
the GPS satellites (not shown) to determine positioning of the user terminal
12 to a
resolution of about 5 meters. The current position of the user terminal 12 is
provided
in Positioning Response message 58 by user terminal 12 to the BTSInode 8 30,
which moasago is forwarded in the Positioning
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Response message 59 to tiae RNC/Core network 32. The DGPS assistance data is
then continued to be provided over the air interface on the DPOGH or DPCCN as
desired for future use.
The user terminal t2 can comprise of many mobile oornmunications devices
including PCS and cellular type mobile phones, computers provided with
suitable
remote access circuitry, and PDAs. Thus, limitation to the particular type of
mobile
user terminal 12 is not to be inferred in the present invention. Rather, the
present
invention is directed to providing the particular type of differential GPS
assistance
data over either or both the DPaCH or DPCCH on a WCDMA carrier to provide
t 5 pcasiliurvinc~ au;urr~cy down to about 5 meters. The Integrated
dlfferenbal GPS
receiver at the WCDMA end user terminal can be integral to the equipment, such
as
embedded within the handset of the mobile station, or an attachment. In
addition, an
external PC or PDA can be provided with an integrated differential GPS
receiver,
and be used as a very accurate map tool, for fleet management etc.
70 Referring now to Figure 3, there is shown a block diagram of one
communication fiormat providing DGPS assistance data over the dedicated
physical
control channel (DPCCH) to mobile user 12. As illustrated, one data packet 60
of
the DPCCH is seen to comprise a slot having a time frame of about 0.625
milliseconds. This data
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packet 60 may comprise a header comprising an N number of bits
comprising the Pilot, a Transport Frame Indicator (TFI), and a
Transport Power Control (TPC). This data is typically used to
control power of the mobile station 12 on the uplink.
This data packet 60 is seen to comprise of one slot of several
slots of a frame generally shown at 62, the slots together having a
frame time of about 10 milliseconds. This frame 62 is seen to
comprise of one of a plurality of frames together comprising a
superframe having a time duration of about 720 milliseconds.
1 o Still referring to Figure 3, the DGPS assistance data
typically comprise of about 5 slots 60 within the frame 62.
However, as standards evolve, this number of slots required to
provide the DGPS assistance data may increase or decrease, and
limitation to the number or length of slots required to provide the
DGPS assistance data is not to be inferred in the present invention.
Referring now to Figure 4, there is shown an alternative
embodiment of the pxesent invention whereby the DGPS assistance
data is provided over the dedicated physical control channel
(DPDCI~ 70. Each packet of information 70 is seen to comprise of
2 0 , one slot of several slots forming a frame 72. These slots together
comprise one frame of several frames 72 comprising a superframe
74. In this embodiment, the DGPS assistance data is provided in
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approximately 4 or 5 slats 70, although limitation to the format of
the information is not to be inferred.
The present invention achieves technical advantages by
providing differential GPS assistance data over the DPDCH and/or
DPCCH of a WCDMA 3G wireless communication network to a
mobile user to aid in positioning the mobile user. The present
invention provides a mechanism facilitating positioning of a mobile
communication terminal 12 to about 5 meters. The user terminal
12 .is provided with an integrated differential GPS receiver to
zo facilitate communication of the mobile device 12 with the WCDMA
network 10. In addition, the user terminal 12 is provided with both
circuitry and software to facilitate positioning of the mobile
terminal 12 using the DGPS assistance data. The present invention
comprises a mechanism for provisioning the data to provide very
accurate map tools, fleet management, etc. in 3G WCDMA systems.
Though the invention has been described with respect to a
specific preferred embodiment, many variations and modifications
will become apparent to those skilled in the art upon reading the
present application. It is therefore the intention that the appended
' claims' be interpreted as broadly as possible in view of the prior art
to include all such variations and modifications.
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