Title of Invention

"A MOBILE STATION OF A CELLULAR TELEPHONE NETWORK FOR TRANSMISSION OF DATA OVER ANALOG & DIGITAL CELLULAR TELEPHONE AIR INTERFACES"

Abstract Mobile stations include a data pump functionality for performing digital bit to waveform coding on a received digital data signal. The waveform coded output (analog data signal) is transmitted over the analog air interface using either an analog traffic channel or analog control channel. For transmission over the analog control channel, the data pump functionality multiplexes the wave form coded analog data signal with mobile station generated cellular system control signals. A data pump functionality is also provided at the other end of the air interface transmission to recover the digital data signal from the waveform coded analog data signal transmission. De-multiplexing of the received analog control channel transmission to extract the data signal is also performed, if necessary. For a data communication sent instead to the mobile station, the reverse operations are performed by the included data pump functionalities at either end of the analog air interface. Thus, the mobile station supports the carrying of IS-130/135 modem functionality on either an analog traffic channel or an analog control channel.
Full Text BACKGROUND OF THE INVENTION
Technical Field of the Invention.
The present invention relates to cellular telephone networks and, in particular, to a method and apparatus for supporting the transmission of data over both an analog and a digital cellular telephone air interface.
Description of Related Art
Cellular telephone networks support a plurality of calling services. The most commonly recognized and widely used calling service relates to the handling of voice
communications to and from the mobile stations of cellular subscribers. Cellular telephone networks further support the provision of data calling services. For example, asynchronous data communications and facsimile communications are also supported by the cellular telephone network.
Cellular telephone networks utilize a number of different types of air interfaces for handling radio frequency communications between a mobile station and a base station. Historically, cellular communications, both voice and data, have been effectuated over an analog air interface using an analog traffic channel. For data communications, this typically necessitates the use of a modem at each end of the air interface to modulate the digital data signal for analog transmission. Recently, however, new capabilities have been provided in implementing a digital air interface for cellular service (see, for example, the TIA/EIA IS-130/135 Specification). The availability of a digital air interface advantageously obviates the need for use of a modem at the mobile station when engaging in a digital data communication. Thus, data
terminal equipment, such as a laptop computer, may be connected easily to the mobile station, with the digital data signal carried over a digital traffic channel of the digital air interface.
There may exist instances within the cellular telephone network where a digital traffic channel on the digital air interface may not be available for use. For example, all digital traffic channels may at the time of mobile station access be in use handing the communications of other cellular subscribers. Alternatively, the particular part of the cellular network being accessed may not yet have been upgraded to support digital traffic channels. In such instances, for the subscriber desiring to immediately make a cellular data communication, a modem must be connected between the data terminal equipment and the mobile station in order to utilize an analog traffic channel to carry the communication. Such a modem is not always readily available, and thus this solution is neither economical nor practical.
There is a need then for a solution that would allow a subscriber to utilize their dual mode (analog and
digital) cellular mobile station to engage in a cellular data communication over either an analog or digital air interface without subscriber need and use of a separate modem.
SUMMARY OF THE INVENTION
A mobile station in accordance with the present invention includes a data pump functionality for performing digital bit to waveform coding on a digital data signal communication received by the mobile station from a connected piece of data terminal equipment. The waveform coded analog data signal output from the data pump functionality is then transmitted over the analog air interface. In one embodiment, the transmission is made over an analog traffic channel of the analog air interface. In another embodiment, the data pump functionality multiplexes the waveform coded analog data signal with mobile station generated cellular system control signals for transmission over an analog control channel of the analog air interface. At the other end of the air interface transmission, another data pump functionality is
provided in either the inter-working unit or the base station to recover digital data signals from the waveform coded analog . data signals transmitted over the air-interface. In connection with the second embodiment, the data pump functionality further demultiplexes the received analog control channel transmission to separate the wave form coded analog data signal from the cellular system control signal. For a data communication sent to the mobile station, the reverse operations are performed by the included data pump functionalities at either end of. the analog air interface.

The subject invention relates to a mobile station for
effectuating data communications over an air interface of a
cellular telephone network, comprising means for interfacing
the mobile station to a piece of data terminal equipment
communicating using digital data signals, characterized in
that:
said means for interfacing processing the digital data
signals according to at least one digital communications
protocol;
a data pump connected to the means for interfacing, for
performing digital bit to analog waveform coding of the
digital data signals transmitted by the data terminal
equipment and processed by the means for interfacing to
output analog data signals, and also performing de-coding on
received analog data signals to output digital data signals
for processing by the means for interfacing and transmitting
to the data terminal equipment; and
means for connecting the data pump to an analog air
interface of the cellular telephone network for transmission
and reception of the analog data signals over the analog air
interface.
The subject invention further relates to a cellular telephone network supporting data communications to and from a piece of data terminal equipment communicating using digital data signals, comprising a cellular telephone connected to the data terminal equipment and a base station in radio frequency communication with the cellular telephone, wherein characterized in that:
the cellular telephone including a data pump for converting between the digital data signals and analog data signals; an analog air interface over which the analog data signals are radio frequency transmitted between the cellular telephone and the base station; and
an inter-working unit connected to the base station for interfacing the cellular telephone network to a public switched telephone network said inter-working unit processing signals received from and transmitted to the base station according to a digital communication protocol.
The subject invention also relates to a method for
effectuating communication of data terminal equipment
digital data signals over a cellular telephone network using
a mobile station capable of radio frequency communication
over an analog air interface, comprising the step of
receiving in the mobile station the digital data signal from
the data terminal equipment, wherein said method is
characterized by the steps of:
processing the digital data signals transmitted by the data
terminal equipment according to a digital communications
protocol;
performing in the mobile station digital bit to analog
waveform coding of the processed signals to output analog
data signals; and
transmitting by the mobile station of the analog data
signals over the analog air interface of the cellular
telephone network.

BRIEF DESCRIPTION OF THEADRAWINGS
A more complete understanding of the method and apparatus of the present invention may be acquired by reference to the following Detailed Description, when taken in conjunction with the accompanying Drawings wherein:
FIGURE 1 is a simplified block diagram of a modulator/demodulator (modem);
FIGURE 2 is a block diagram of a telephone network including a cellular communications portion;
FIGURE 3 is a schematic diagram of the cellular communications portion of the telephone network illustrating its operation in connection with making a data communication over a digital air interface;
FIGURE 4 is a schematic diagram of the cellular communications portion of the telephone network illustrating a dual mode data transmission system of the present invention and its operation in connection with making a data communication over an analog, as well as a digital, air interface;
FIGURE 5 is a schematic diagram of the analog air interface; and
FIGURE 6 is a schematic diagram of the cellular communications portion of the telephone network illustrating an alternative embodiment of a dual mode data transmission system of the present invention and its operation in connection with making a data communication over an analog, as well as a digital, air interface.
DETAILED DESCRIPTION OF THE DRAWINGS
Reference is now made to FIGURE 1 wherein there is shown a simplified block diagram of a modulator/demodulator (modem) 10 having a configuration known to those skilled in the art. The modem 10 includes a serial data port 12 that may be connected to any one of a number of data devices (not shown) including, for example, a data terminal (personal computer or laptop) . Connected to the data port 12 via connection 14 is a protocol processor (PP) 16 for performing a data formatting function implementing a particular V.X modem communications protocol, like V.34 or V.42bis. Connected to the protocol processor 16 via a connection 18 is a data pump (DP) 20 that performs the actual modulator and demodulator functions for the modem 10 by means of a digital bit to wave form coding and decoding operation. Connected to the data pump 20 via connection 22 is an analog port 24 for making an analog communications connection to, for example, an analog telephone line, link or connection (not shown). The connection 14, protocol processor 16, connection 18, data pump 20 and connection 22 form a modem portion 10' of the
modem 10, with the modem portion used when a modem functionality is incorporated within a device rather than provided or implemented as a stand-alone product.
In a data transmission mode of operation, a serial digital data signal output from a data terminal is received at serial data port 12 and formatted in accordance with the appropriate communications protocol by the protocol processor 16. This formatting operation includes breaking the binary data stream of the digital data signal into sets of bits (or frames) . The formatted digital data signal is then modulated by the data pump 20 onto the carrier as a unique combination of carrier phase and amplitude changes, and output as an analog data signal from the analog port 24. The reverse functional operations take place with respect to analog data signals received by the modem 10 at the analog port 24. Thus, the phase and amplitude changes in the received analog data signal are first demodulated by the data pump 20, and the signal is then converted (i.e, de-formatted) in accordance with the proper protocol by the protocol processor 16 to reconstruct the original binary data stream for output from data port 12.
Reference is now made to FIGURE 2 wherein there is shown a block diagram of a telephone network 30 including a cellular communications portion 32. The cellular communications portion 32 includes a mobile station (MS) 34 in radio frequency communication with a fixed site base station (BS) 36 by way of an air interface 38. The mobile station 34 comprises a dual mode mobile station, meaning that it is capable of communicating over the air interface 38 in either an analog or a digital mode. In that connection, it will be understood that the base station 36 further supports both analog and digital communications over the air interface 38 as well.
The cellular communications portion 32 of the telephone network 30 further includes a mobile switching center (MSC) 40 connected to a plurality of base stations including the illustrated base station 36. The mobile switching center 40 performs the switching functions for routing telephone calls to and from mobile stations 34. The mobile switching center is connected to an inter-working unit (IWU) 42 which includes a modem portion 10' which may be of the same type as that shown in FIGURE 1.

The inter-working unit 42 functions to interface the cellular communications portion 32 of the telephone network 30 to the public switched telephone network 44.
The telephone network 30, including its cellular communications portion 32, supports data transmissions as well as voice transmissions. For data communications, a cellular service subscriber (not shown) may connect data terminal equipment (DTE) 46 comprising, for example, a personal computer (laptop) via a serial digital data signal connection 48 to the mobile station 34. A data call transmitting, and perhaps exchanging, digital data signals may then be made to or received from a second data terminal equipment 50. In this example, second data terminal equipment 50 is shown connected through a modem 10 (like that shown in FIGURE 1) to the public switched telephone network 44. A digital traffic channel (DTC) 52 is seized in connection with the data call to support the transmission of the digital data signal over the air interface 38. The modem portion 10' within the inter-working unit 42 performs the protocol conversions, formatting, de-formatting, modulations and demodulations
necessary for analog transmission of the digital data signals for the data call to and from the public switched telephone network 44. The modem 10 connected to the second piece of data terminal equipment 50 performs the same functions with respect to also making a communications connection with the public switched telephone network 44. Reference is now made to FIGURE 3 wherein there is shown a schematic diagram of the cellular communications portion 32 of the telephone network 30 illustrating its operation in connection with handling a data communication. The mobile station 34 processor (not shown) operates in accordance with TIA/EIA IS-135 Specification functionality 60 and the IS-130 Specification functionality 62 to support digital data services with respect to a connected piece of digital terminal equipment 46. Specifically, these functionalities 60 and 62 allow the mobile station 34 to support the Hayes AT modem command set, provide V.X, and in particular, V.42bis, data/fax services and implement any necessary radio link protocols (RLP) for sending and receiving digital data signals of the type carried over, for example, connection 14 of the modem portion 10' (FIGURE
1) . The IS-130 Specification functionality 62 requires a TIA/EIA IS-136 Specification transport layer 64 to convey the digital data signals. This restricts the mobile station 34 to a data communication mode of operation through the use of one of the air interface 38 made available digital traffic channels 52.
The signal processing effectuated within the base station 36 functions to remove the digital data signal transmission from the TIA/EIA IS-136 Specification transport layer 64 digital traffic channel 52. Signal processing in accordance with TIA/EIA IS-130 Specification functionality 62 and TIA/EIA IS-135 Specification functionality 60 effectuated within the inter-working unit 42 further processes the received digital data signal in accordance with the appropriate radio link protocols to support the digital data services and recover the digital data signal originally sent by the data terminal equipment 46. The recovered digital data signal is then further processed by the modem portion 10', implementing, for example, the V.34 protocols, for analog data signal
transmission of the data communication toward the public switched telephone network 44 (see, FIGURE 2).
Reference is now made to both FIGURES 2 and 3. Mobile stations 34 have a tendency to roam throughout the cellular service area. Often times, such roaming occurs during a call (either voice or data) and it becomes necessary for the cellular communications portion 32 of the telephone network 30 to change the base station 36 through which cellular communications services are being effectuated. This practice, commonly referred to as hand-off or handover, is generally illustrated occurring at 66 (of FIGURE 2) where the mobile station 34 is switching its air interface communication from base station 36 to base station 36'. In some instances, the air interface 38 supported by a currently serving one of the base stations 36 differs, as is shown, from the air interface 38" supported by the target base station 36' at hand-off. This necessitates not only a change in traffic channel for the mobile station 34, but also may necessitate a change in the hyperband being used and perhaps the mode (analog versus digital) of mobile station operation. This may also
introduce problems (discussed below) in maintaining the cellular communication after hand-off occurs.
Suppose, for example, that the base station 36 supports use of a dual mode (analog and digital) air interface 36 while the base station 36' supports an air interface 38' that is either analog only or is dual mode but presently has only analog service capabilities available (perhaps due to loading problems on the digital side) . Further suppose that the mobile station is currently engaged in a data communication using base station 36 and its air interface 38. Because the TIA/EIA IS-130 Specification functionality 62 requires a TIA/EIA IS-136 Specification transport layer 64 for digitally transmitting the data communication, and because the analog air interface 38' has not historically been able to provide that transport layer 64, data services cannot be provided to the mobile station 34 and the currently engaged data communication is lost when a hand-off 66 of the mobile station 34 is made from base station 36 to base station
Reference is now made to FIGURE 4 wherein there is shown a schematic diagram of the cellular communications portion 32 of the telephone network 30 illustrating a dual mode data transmission system of the present invention and its operation in connection with making a data communication over an analog, as well as a digital, air interface. The mobile station 34' processor implements the TIA/EIA IS-135 Specification functionality 60 and the IS-130 Specification functionality 62 to support digital data services with respect to the connected digital terminal equipment 46. Specifically, these functionalities 60 and 62 allow the mobile station 34' to support the Hayes AT modem command set, provide V.X, and in particular, V.42bis, data/fax services and implement all necessary radio link protocols (RLP) for sending and receiving digital data signals. With respect to the making of a data communication using the digital air interface 38, the mobile station 34' operates in the same manner as the mobile station 34 shown in FIGURES 2 and 3 using an IS-136 transport layer 64. To make a data communication using the analog air interface 38', however, the mobile station 34'
further includes a V.32 or similar data pump 68 for performing any digital to analog (or vice versa) data signal conversions needed to transmit (or receive) information over the analog air interface 38'. These conversions comprise the modulation and de-modulation of the data signals using a unique combination of carrier phase and amplitude changes. The data pump 68 further functions to emulate the TIA/EIA IS-136 Specification transport layer 64 expected by the IS-130 Specification functionality 62 and enable, through implementation of an appropriate modem link protocol (MLP), access to an analog traffic channel (ATC) 68 of the air interface 38'. The inter-working unit 42 at the other end of the analog data signal communication made through the base station 36' also includes a V.32 or similar data pump 68 to perform the same operations.
Reference is now made to FIGURE 5 wherein there is shown a schematic diagram of the analog air interface 38' which shows that the air interface includes a plurality of analog traffic channels 68 and at least one analog control channel (ACC) 70. The analog control channel 70 is
Manchester encoded to carry control messages and signals between the base station 36 and the mobile station 34. Even though it has a relatively high data rate, the control channel 70 is not a particularly efficient carrier of control messages and signals due message repetition requirements. Thus, even with an available bandwidth of ten kilohertz, only approximately one-hundred fifty bits per second of control signaling are actually transmitted over the channel 70.
Reference is now made to FIGURE 6 wherein there is shown a schematic diagram of the cellular communications portion 32 of the telephone network 30 illustrating an alternative embodiment of a dual mode data transmission system of the present invention and its operation in connection with making a data communication over an analog, as well as a digital, air interface. The mobile station 34' further includes a control functionality 72 for processing and responding to received control messages and signals, as well as generating outgoing control messages and signals. The mobile station 34'• processor operates in accordance with TIA/EIA IS-135 Specification
functionality 60 and the IS-130 Specification functionality 62 to support digital data services with respect to a connected piece of digital terminal equipment 46. Specifically, these functionalities 60 and 62 allow the mobile station 34 to support the Hayes AT modem command set, provide V.X, and in particular, V.42bis, data/fax services and implement any necessary radio link protocols (RLP) for sending and receiving digital data signals. With respect to the making of a data communication using the digital air interface 38, the mobile station 34'" operates in the same manner as the mobile station 34 shown in FIGURES 2 and 3 using an IS-136 transport layer 64. The mobile station 34' further includes a V.32 data pump (MUX DP) 74 for performing any digital to analog (or vice versa) conversions needed to transmit (or receive) information over the analog air interface 38'. These conversions comprise the modulation and de-modulation of the data signals using a unique combination of carrier phase and amplitude changes. The data pump 74 further functions as an IS-136 emulator, in the manner described above, as well as a multiplexer and de-multiplexer with respect to the
control messages and signals transmitted to and from the control functionality, and the data communications transmitted to and from the IS-130 Specification functionality 62. Multiplexed control messages and signals and analog data signals are then transmitted between the mobile station 34' and base station 36' using different logical sub-channels within the analog data control channel 70 of the analog air interface 38'. The base station 36' at the other end of the analog communication made using the analog control channel 70 also includes a V.32 data pump 74 to perform the same operations. Thus, multiplexing and de-multiplexing is performed with respect to the control messages and signals and the data signals transmitted to and from the inter-working unit 42' . The data pump 74 of the base station 36' also performs any digital to analog (or vice versa) conversions needed to transmit (or receive) information over the analog air interface 38'. The inter-working unit 42' includes the TIA/EIA IS-130 Specification functionality 62 connected to both the data pump 74 of base station 36' as well as the TIA/EIA IS-136 Specification transport layer 64 of the base station 36. The inter-
working unit 42•' further includes the IS-135 Specification functionality 60 as well as a modem portion 10', implementing, for example, the V.34 protocol.The communications systems illustrated in FIGURES 4 and 6 accordingly support mobile station 34' and 34' operation over the digital traffic channels 52, the analog traffic channels 68 and the analog control channel 70. Thus, during mobile station 34' and 34' operation, support is provided for not only the initial communications selection of, but also the hand-off of data communications among and between any of the digital traffic channels 52, the analog traffic channels 68 and/or the analog control channel 70. Hand-off is effectuated in the manner well known in the art. The control functionality 72 controls mobile station 34' operation in making the initial and hand-off selections with respect to transmission over the analog or digital air interfaces.
Although preferred embodiments of the present invention have been illustrated in the accompanying Drawings and described in the foregoing Detailed Description, it will be understood that the invention is
not limited to the embodiments disclosed, but is capable of numerous rearrangements, modifications and substitutions without departing from the spirit of the invention as set forth and defined by the following claims. In particular, although illustrated and disclosed in connection with an implementation under the IS-130/135 Specification, it will be understood that the present invention may be equally well implemented in connection with other modem specifications including, for example, a Global System for Mobile (GSM) Communications data modem.



We claim;
1. A mobile station (34', 34") of a cellular telephone network (32), for
transmission of data over analog and digital cellular telephone air
interface (38, 38) comprising means for interfacing the. mobile
station to a piece of data terminal equipment (46) communicating
using digital data signals, characterized in that:
said means for interfacing processing the digital data signals according to at least one digital communications protocol (60, 62); a data pump (69, 74), connected to the means for interfacing, for performing digital bit to analog waveform coding of the digital data signals transmitted by the data terminal equipment and processed by the means for interfacing to output analog data signals, and also performing de-coding on received analog data signals to output digital data signals for processing by the means for interfacing and transmitting to "the data terminal equipment; • and
means for connecting the data pump to an analog air interface (38') of the cellular telephone network for transmission and reception of the analog data signals over the analog air interface.
2. The mobile station as claimed in claim 1 wherein the analog air
interface includes a plurality of analog traffic channels (68), and
the means for connecting the data pump to the analog air
interface connects the mobile station to a selected one of the
25

analog traffic channels for transmission and reception of the analog data signals over the analog air interface.
3. The mobile station as claimed in claim 2-wherein the analog air
interface includes an analog control channel (70), including
means for switching the data communications connection
between the selected one of the analog traffic channels and the
analog control channel.
4. The mobile station as claimed in claim 1 wherein the analog air
interface includes at least one analog control channel (70), and
the means for connecting the data pump to the analog air
interface connects the mobile station to the analog control
channel for transmission and reception of the analog data signals
over the analog air interface.
5. The mobile station as claimed in claim 4 wherein the analog air
interface has a plurality of analog traffic channels, including
means for switching the data communications connection
between the analog control channel and a selected one of the
plurality of analog traffic channels.
6. The mobile station as claimed in claim 4, wherein it has including
a control functionality (72) for processing transmitted and
received cellular telephone network control signals, and wherein
26

the means for connecting the data pump to the analog air interface is connected also to the control functionality and further multiplexes and de-multiplexes the analog data signals and control signals transmitted and received together over the analog control channel of the analog air interface.
7. The mobile station as claimed in claim 1 wherein the cellular
telephone network includes a digital air interface (38) having a
plurality of digital traffic channels (52), the mobile station
including means for connecting the digital data signals for
transmission and reception over a selected one of the digital
traffic channels of the digital air interface.
8. The mobile station as claimed in claim 7, wherein it comprises
means for switching the data communications connection
between the selected one of the digital traffic channels of the
digital air interface and a selected analog channel of the analog
*
air interface.
9. The mobile station as claimed in claim 8 wherein the analog
channel comprises an analog traffic channel (68).
10. The mobile station as claimed in claim 8 wherein the analog
channel comprises an analog control channel (70).
27

11. The mobile station as claimed in claim 1 wherein at least one
digital communications protocol includes a digital radio link
protocol.
12. The mobile station as claimed in claim 11 wherein the data pump
emulates a digital air interface protocol (64) when receiving
signals from and transmitting signals to the means for interfacing.
13. A mobile station substantially as herein described with reference
to and illustrated in the accompanying drawings.

Documents:

2068-del-1997-abstract.pdf

2068-del-1997-claims.pdf

2068-del-1997-correspondence-others.pdf

2068-del-1997-correspondence-po.pdf

2068-del-1997-description (complete).pdf

2068-del-1997-drawings.pdf

2068-DEL-1997-Form-1.pdf

2068-del-1997-form-13.pdf

2068-del-1997-form-19.pdf

2068-DEL-1997-Form-2.pdf

2068-del-1997-form-3.pdf

2068-del-1997-form-4.pdf

2068-del-1997-form-6.pdf

2068-del-1997-gpa.pdf

2068-del-1997-pct-210.pdf

2068-del-1997-pct-220.pdf

2068-del-1997-pct-409.pdf

2068-del-1997-pct-416.pdf

2068-del-1997-petition-138.pdf


Patent Number 214854
Indian Patent Application Number 2068/DEL/1997
PG Journal Number 10/2008
Publication Date 07-Mar-2008
Grant Date 18-Feb-2008
Date of Filing 24-Jul-1997
Name of Patentee ERRICSSON INC.
Applicant Address 7001 DEVELOPMENT DRIVE, P.O. BOX 13969, RESEARCH TRIANGLE PARK, NORTH CAROLINA, 27709 U.S.A
Inventors:
# Inventor's Name Inventor's Address
1 BILLY G. MOON 305 PARK BRANCH LANE, APEX, NORTH CAROLINA 27502, U.S.A.
PCT International Classification Number G06F 13/00
PCT International Application Number N/A
PCT International Filing date
PCT Conventions:
# PCT Application Number Date of Convention Priority Country
1 08/698,131 1996-08-15 U.S.A.