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WO1997030540A1 - Appareil et procede d'interface de protocole - Google Patents

Appareil et procede d'interface de protocole Download PDF

Info

Publication number
WO1997030540A1
WO1997030540A1 PCT/US1997/001797 US9701797W WO9730540A1 WO 1997030540 A1 WO1997030540 A1 WO 1997030540A1 US 9701797 W US9701797 W US 9701797W WO 9730540 A1 WO9730540 A1 WO 9730540A1
Authority
WO
WIPO (PCT)
Prior art keywords
baseband signal
frame formatter
microcontroller
formatter
transmitted
Prior art date
Application number
PCT/US1997/001797
Other languages
English (en)
Inventor
Jacqueline Mullins
Alan Hendrickson
Paul Schnizlein
Original Assignee
Advanced Micro Devices, Inc.
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Advanced Micro Devices, Inc. filed Critical Advanced Micro Devices, Inc.
Publication of WO1997030540A1 publication Critical patent/WO1997030540A1/fr

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M1/00—Substation equipment, e.g. for use by subscribers
    • H04M1/72—Mobile telephones; Cordless telephones, i.e. devices for establishing wireless links to base stations without route selection
    • H04M1/725—Cordless telephones
    • H04M1/733—Cordless telephones with a plurality of base stations connected to a plurality of lines
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M1/00—Substation equipment, e.g. for use by subscribers
    • H04M1/72—Mobile telephones; Cordless telephones, i.e. devices for establishing wireless links to base stations without route selection
    • H04M1/725—Cordless telephones
    • H04M1/72502—Cordless telephones with one base station connected to a single line

Definitions

  • the present invention relates to an interface of a telecommunications device and, more particularly, to an interface of a frame formatter of a baseband integrated circuit employable in base set and hand set units of digital cordless telephones.
  • Telecommunications technology has significantly advanced, particularly in recent decades. Current trends in telecommunications research and development efforts appear to indicate that achieving greater mobility, and maintaining capabilities and quality, will be significant areas of interest in the future of telecommunications technology.
  • One type of telecommunications device that allows for increased mobility over the standard cord-connected telephone is the digital cordless telephone.
  • Digital cordless telephones are generally known, however, design improvements and enhanced operations continue to be attained. Although improvements and advances are being made in telecom ⁇ iunications technology which aid in allowing greater mobility, they incidentally may give rise to certain problems and disadvantages. With greater mobility, for example, comes the necessity for better reduction of noise interference, greater power requirements, and increased capabilities in transfer of greater amounts of information over radio frequency (RF) bandwidth and electrical pathways.
  • RF radio frequency
  • signal communication configurations of telecommunications equipment may exhibit various desired characteristics and advantages according to design.
  • the protocol or "format" of transmitted and received signals may impact design choices. This is certainly the case where a particular, desirable format is communicated over RF and communications units must appropriately operate to make communications possible through that format.
  • the signal communications by the equipment may be preferable in a certain design in comparison to other designs.
  • the particular operation, application, and service of telecommunications devices, such as digital cordless telephones are limited only by the designer's capabilities and imagination and the limits of the technology.
  • embodiments of the present invention present various advantages and improvements, not heretofore realized, in signal communications between components and sub- parts of a telecommunications device, which device may, for example, be a digital cordless telephone.
  • a telecommunications device which device may, for example, be a digital cordless telephone.
  • the particular configurations of the components and sub-parts and of the signal communications therebetween provide significant improvements and advances in the art and technology of telecommunications and, particularly, digital cordless telecommunications.
  • An embodiment of the invention is an apparatus for digital cordless telecommunications.
  • the apparatus includes a frame formatter.
  • the frame formatter provides logical channel formatting of transmitted baseband signals and received baseband signals.
  • the apparatus comprises a radio interface connection with the frame formatter, for delivering and receiving the transmitted baseband signal and the received baseband signal, respectively, a FIFO/codec interface connected with the frame formatter, an interrupt interface connected with the frame formatter, a control register interface connected with the frame formatter, and a microcontroller interface connected with the frame formatter.
  • Another embodiment of the invention is a method of digital cordless telecommunications, wherein the method includes formatting of transmitted baseband signals and received baseband signals.
  • the method comprises the steps of interfacing with a radio, for delivery and reception of the transmitted baseband signal and the received baseband signal, respectively, interfacing with a codec to decode and encode the received baseband signal and the transmitted baseband signal, respectively, interfacing with an interrupt controller to maintain veracity of the transmitted baseband signal and the received baseband signal, interfacing with a microcontroller to communicate error and control signals to receive the received baseband signal and to transmit the transmitted baseband signal, and interfacing with a microcontroller to ensure operation of the microcontroller conforms operations to receive the received baseband signal and to transmit the transmitted baseband signal.
  • Fig. 1 is an illustration of a telecommunications system connected with several communications units, including a digital cordless telephone base set unit and hand set unit, each comprising certain embodiments of the present invention
  • Fig. 2 is a view of certain elements, in accordance with certain embodiments of the present invention, within a base station unit or hand set unit shown in Fig.1;
  • Fig. 3 is a block diagram of functional blocks of a baseband chip having an interface according to certain embodiments of the present invention.
  • Fig. 4 is an example frame format, according to certain embodiments of the present invention, which frame format may serve for desired transmissions and receptions of communicated information.
  • the telecommunications network 2 is typically a PSTN (Public Switched Telephone Network), although an ISDN (Integrated Services Digital Network) may also be an application for the embodiments of the invention.
  • PSTN Public Switched Telephone Network
  • ISDN Integrated Services Digital Network
  • the illustration of the telecommunications network 2 shows, in particular, base set units 4 of two cordless telephones wire-linked with other portions of the telecommunications network 2.
  • Each of the base set units 4 has a particular hand set unit 6 with which the base set unit 4 is in radio frequency (RF) communication.
  • RF radio frequency
  • the telecommunications network 2 is shown to include a typical corded telephone 8 and another telecommunications device 10, which may be, for example, a communications device such as a facsimile machine, a modem for a computer, or some other such device.
  • a network link 12 which may, for example, be a wired-link, an optical fiber link, a long-distance radio link, or some other communications link.
  • Each of the cordless telephone devices of the illustrated embodiment comprises one base set unit 4 and one corresponding hand set unit 6.
  • the base set unit 4 and hand set unit 6 communicate over an RF link 14, so that communications information may be passed between the hand set unit 6 and base set unit 4.
  • the base set unit 4 being tied by the network link 12 with the telecommunications network 2, receives communications from the network 2 and passes communications to the network 2. Because the base set unit 4 and hand set unit 6 are capable of passing communications information back and forth between the units 4, 6, communications from the telecommunications network 2 may be passed to the hand set unit 6 and passed from the hand set unit 6 to the telecommunications network 2, each via the base set unit 4 and the link 12.
  • the base set unit 4 of a cordless telephone is virtually immobile, or at most mobile over a very limited range, because of the fixed physical length of the network link 12 to such unit 4.
  • the same is true of the typical corded telephone 8 and other telecommunications device 10 because each is linked to the network 2 by a fixed physical length connector, such as a wire, optical fiber, or other equipment, which serves as the network link 12.
  • a fixed physical length connector such as a wire, optical fiber, or other equipment, which serves as the network link 12.
  • the hand set unit 6 may have much greater mobility. This is so because the hand set unit 6 is mobile with respect to the base set unit 4 and unimpeded by a fixed physical length connector such as the link 12.
  • communications between base set unit 4 and hand set unit 6 occur over the RF link 14.
  • the RF communications between base set unit 4 and hand set unit 6 over the RF link 14 may generally be accomplished at greater and varied distances between base set unit 4 and hand set unit 6 in comparison to the fixed physical length connector as the network link 12 of other types of devices.
  • Such an RF link 14 between base set unit 4 and hand set unit 6, versus some other physical network link 12, such as a fixed length wire, thus, provides much greater flexibility of use of the hand set unit 6 at varied locations during communications.
  • cordless telephone devices 4, 6, such as those illustrated in Fig. 1, embodiments of the present invention will be applicable to many of those variations and improvements.
  • Certain variations and improvements in the cordless telephone devices 4, 6 could include, for example, multiple hand set units 6 communicating with a single base set unit 4; hand set unit 6 communications capability with any one of a group of base set units 4 capable of such communications, when in the vicinity of a base set unit 4 of the group; office branch exchanges or intercom systems with multiple hand set units 6 communicating with one or more base set units 4; and others.
  • a cordless telecommunications unit 20 which may be either a base set unit 4 or a hand set unit 6, includes two main parts.
  • the two parts are a baseband chip 22 and a radio 24.
  • the baseband chip 22 may include a variety of devices, such as various controllers, codecs, formatters, and other functions.
  • the baseband chip 22 may be a single semiconductor chip, some other integrated circuit, or other functional circuitry.
  • the radio 24 may also include various functionality, such as, for example, various oscillators, up and down convertors, synthesizers, and antennas.
  • the radio 24 may be a semiconductor device, another integrated circuit, or other circuitry.
  • a particularly desirable cordless telecommunications unit 20 comprises a baseband chip 22 which operates at CMOS-levels and transmits and receives various signals to and from the radio 24 at those levels.
  • the radio 24 of such a desirable unit 20 converts RF signals 14 to and from the CMOS-level baseband signals of the baseband chip 22 to enable RF communications among corresponding hand set and base set units 4, 6.
  • the baseband chip 22 and radio 24 of the unit 20 pass signals, such as a transmit baseband signal 226, a receive baseband signal 228, and a reference clock output 224, each between the other.
  • signals 226, 228, 224 various other signals 30 may be passed between the radio 24 and the baseband chip 22 to accomplish a variety of purposes, for example, reset, wake-up, power monitor, interrupt, and a wide variety of other purposes depending upon the interfacing aspects and desired functions of the unit 20.
  • the cordless telecommunications unit 20 may be equipped with various peripherals (not shown) in order to allow appropriate usability and desired operations.
  • the peripherals may include, for example, matters such as power, power controls, touch keys, on/off controls, speakers, LCD's, transducers, such as microphones and ear pieces, key scanners, and other peripheral elements.
  • the telecommunications unit 20 In order to function as a digital cordless telephone, the telecommunications unit 20 must be equipped with a variety of those peripherals and others, as those skilled in the art will know and appreciate.
  • the reference numeral 22 refers, in general, to the baseband chip 22 of a cordless telecommunications unit 20 (shown in Fig. 2).
  • the functional blocks of the embodiment of the chip 22 are shown in Fig. 3.
  • the baseband chip 22 includes various elements forming a system control function block 40, an audio function block 42, and a protocol function block 44.
  • These functional blocks 40, 42, 44 of the baseband chip 22 are each particularly interfaced to connect with others of the functional blocks 40, 42, 44 and external elements in desired manners to accomplish desired and preferred communication through use of an optimized frame format (illustrated in Fig. 4, as hereinafter described).
  • the embodiments of the present invention comprise the interfaces of the protocol function block 44 with the other functional blocks 40, 42 of the chip 22 and with the radio 24 (shown in Fig. 2). Details of the frame formatter 112 and a desirable format 150 will be later discussed. In order to understand the various embodiments of the present invention, it is sufficient merely to understand that the frame formatter 112 formats transmissions and receives appropriately formatted receptions.
  • the protocol function block 44 there are five primary interfaces to the protocol function block 44. Each of those interfaces is with the frame formatter 112 of the protocol function block 44.
  • the five interfaces are: (1) a radio interface 114, connecting the frame formatter 112 with the radio 24 (shown in Fig. 2) of the telecommunications unit 20 (also shown in Fig.
  • These five interfaces of the frame formatter 112 of the protocol function block 44 enable operations of the baseband chip 22 when a frame format, such as, for example, a multiple logical channel format like the format 150 (shown in Fig. 4, and hereinafter discussed) or some other format of transmitted and received data is employed.
  • the radio interface 114 comprises a transmit bus 226 and a receive (R XB ⁇ bus 228. These buses 226, 228 allow the baseband chip 22 to communicate baseband signals with the radio 24 (shown in Fig. 2) of the cordless telecommunications unit (Fig. 2)
  • the baseband signals may be communicated according to a desirable frame format therefor, such as, for example, the three logical channel format 150 (Fig. 4).
  • the buses 226, 228 may, for example, be configured to operate in a serial manner.
  • the microcontroller interface 140 directly connects the microcontroller 130 with certain registers (not shown in detail) of the frame formatter 112. Those registers may be supplied with certain information by the microcontroller, via the microcontroller interface 140. The information maintained in those registers may be used at the frame formatter 112 to control the formatter 112 operation. Software may, for example, cause the microcontroller 130 to write certain values to the registers. Those values, then, control the formatter 112 operations. The values may dictate the start of transmission, the synchronization pattern to be detected, the data to be transmitted over certain logical channels, or other matters at the formatter 112.
  • control register interface 147 provides for passage of control data, for example, D-Channel data 154 (shown in Fig. 4), between the control register 125 of the formatter 112 and the microcontroller 130. Such data may be passed both ways across the interface 147.
  • the D-Channel data 154 comprises many error communication flags, such as cyclic redundancy check (not shown) and parity errors (also not shown).
  • the D-Channel data 154 provides status communication flags, such as receive buffer full (also not shown). These flags are used to control the formatter, and to communicate with the remote unit 20 (Fig. 2).
  • the interrupt interface 146 directly connects an interrupt controller 144 with the frame formatter 112.
  • the frame formatter 112 may pass interrupt signals or status bits to the interrupt controller 144 over the interrupt interface 146.
  • the interrupt signals and status bits passed over the interrupt interface 146 may serve a variety of purposes, as those skilled in the art will know and appreciate. Certain particular reasons those signals and bits may be sent by the formatter 112 to the interrupt controller 144 may include, for example, to indicate conditions of signals at the radio interface 114 or other conditions or matters.
  • the FIFO/codec interface 128 serves to interface a FIFO element (not shown in detail) of the frame formatter 112 with the codec 124, which, for example, may be an adaptive differential pulse code modulator (ADPCM).
  • the FIFO/codec interface 128 provides for passage of data, for example, B-Channel data 156 (shown in Fig. 4), between the FIFO element of the formatter 112 and the codec 124. Such data may be passed both ways across the interface 128.
  • the FIFO element in such embodiment, may serve as a buffer between the codec 124 and the frame formatter 112.
  • the FIFO element may also, according to certain embodiments, accept clock timing adjustment information from the frame formatter 112. Based on such information, the FIFO element may enable corrections to the internal clocks generated by the formatter 112. Corrected internal clocks may, for example, be passed over the FIFO/codec interface 128 to the codec 124 and employed to keep the chip 22 synchronized.
  • a multichannel data format for example, the format 150
  • the multichannel data format may comprise several distinct logical channels, such as, in the case of the format 150, three logical channels.
  • the three logical channels are: a transparent voice B-channel 156, an error- control, packetized control D- channel 154, and a framing synchronization SYN-channel 152.
  • Such a three channel format 150 may be followed in communications between the baseband chip 22 (Figs.
  • a cordless telecommunications unit 20 (Fig. 2). That three channel format 150 could also be followed in RF communications units 20, 20' (Fig. 2), such as, for example, the base set unit 4 and the hand set unit 6 of a digital cordless telephone (Fig. 1).
  • each such format 150 comprises an initial SYN-channel 152 of data which contains a fixed synchronization pattern (not shown) for timing recovery and frame alignment.
  • the SYN-channel 152 data allows the receiving radio 24 (shown in Fig. 2) to synchronize with the frame formatter 112 during transmission, and the frame formatter 112 to synchronize with the radio 24 during reception.
  • the D-channel 154 and then the B-channel 156 alternate in four subparts each.
  • the D-channel 154 is control data for non- audio, system communications.
  • the B-channel 156 is audio data, such as voice data.
  • the T ⁇ BB bus 226 can run asynchronously, giving added flexibility to the frame formatter 112 and the radio 24 (shown in Fig. 2) to either speed up or slow down the transmission rate.
  • the frame formatter 112 of a unit 20 receives data streams of the form of the frame format 150 and then determines the transmission rate of the received data stream. Once the transmission rate is determined, each of the SYN-channel 152 data packet, the D-channel 154 data packets, and the B-channel 156 data packets are extracted and registered. The frame formatter 112 also delivers data streams of the form of the frame format 150 to the radio 24 of the unit 20 when transmitting to another unit 20'.
  • the frame formatter 112 may thereby integrate with the baseband chip 22 and the radio 24 to accomplish desired receptions and transmissions, both of the form of the frame format 150, by the telecommunications unit 20.
  • the audio interface 128 provides an avenue for the B-channel 156 data received over RF by the unit 20 to pass from the frame formatter 112 to the codec 124 for modulation and also an avenue for the B-channel 156 data encoded at the codec 124 to pass to the frame formatter 112 for formatting and delivery to the radio 24 for RF transmission by the unit 20.
  • the microcontroller interface 140 and interrupt interface 146 each provide for complementary activities directed to overall baseband chip 22 control.
  • the D- channel 154 data may be passed over the microcontroller interface 140 from the microcontroller 130 as instructions to the frame formatter 112 for baseband chip 22 transmit and receive operations.
  • the interrupt interface 146 may serve for passage of interrupt signals from the frame formatter 112 to the interrupt controller 144 upon the existence of conditions at or detected by the frame formatter 112 which dictate changes at the microcontroller 130, such as, for example, software or hardware errors and others.
  • the interrupt controller 144 and microcontroller 130 are operatively intertwined to provide desired operations of the baseband chip 22.

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

Un appareil de télécommunications numériques sans fil comprend un formateur de trame qui formate les voies logiques de signaux dans la bande de base transmis et de signaux dans la bande de base reçus. L'appareil comprend une connexion d'interface radio avec le formateur de trame qui sert à communiquer et à recevoir respectivement le signal dans la bande de base transmis et le signal dans la bande de base reçu, une interface FIFO/codec connectée au formateur de trame, une interface registre de commande connectée au formateur de trame et une interface microcontrôleur connectée au formateur de trame.
PCT/US1997/001797 1996-02-15 1997-02-03 Appareil et procede d'interface de protocole WO1997030540A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US60175696A 1996-02-15 1996-02-15
US08/601,756 1996-02-15

Publications (1)

Publication Number Publication Date
WO1997030540A1 true WO1997030540A1 (fr) 1997-08-21

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Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/US1997/001797 WO1997030540A1 (fr) 1996-02-15 1997-02-03 Appareil et procede d'interface de protocole

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WO (1) WO1997030540A1 (fr)

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0580341A2 (fr) * 1992-07-21 1994-01-26 Advanced Micro Devices, Inc. Circuit intégré et téléphone sans fil utilisant le même
EP0666669A1 (fr) * 1994-02-04 1995-08-09 Advanced Micro Devices, Inc. Controleur de bande de base à deux modes, pour téléphone sans fil

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0580341A2 (fr) * 1992-07-21 1994-01-26 Advanced Micro Devices, Inc. Circuit intégré et téléphone sans fil utilisant le même
EP0666669A1 (fr) * 1994-02-04 1995-08-09 Advanced Micro Devices, Inc. Controleur de bande de base à deux modes, pour téléphone sans fil

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