Method and apparatus for providing a private communication system in a public switched telephone network
29 claims: 7 independent, 22 dependent
- 1REIVINDICAÇÕES 1 - Em um sistema de comunicação em que usuários se comunicam através de uma rede telefônica de linhas comutadas, uma rede de comunicação privada para 5 facilitar a comunicação entre uma pluralidade de usuários membros, caracterizada pelo fato de que a dita rede de comunicação privada compreende:um gerenciador de chamadas de rede que inclui : 10 uma interface de rede de telefone para estabelecer uma ligação de telefone com cada um da dita pluralidale de usuários membros sobre uma pluralidade de canais da dita rede telefônica de linhas comutadas, respectivamente, 15 uma matriz de chaves, acoplada à dita interface de rede telefônica, para proporcionar um sinal de informação recebido pela dita interface de rede telefônica sobre um da dita pluralidade de canais para outro da dita pluralidade de canais por intermédio da
- 22ü cita interface de rede telefônica, e uma disposição de controlador para configurar a dita matriz de chaves em resposta a sinais de pedido de conversação recebidos sobre um selecionado da dita pluralidade de canais; e 25 uma pluralidade de conjuntos de telefones autorizados dispostos para comunicação sobre a dita pluralidade de canais, cada um dos ditos conjuntos de telefones autorizados incluindo disposições para gerar • 4 • 4» · • · · 4 4 4 44 · · · · um dos ditos sinais cie pedido de conierèa^ab. :: ·· *· 2 - Rede de comunicação privada, de acordo com a reivindicação 1, caracterizada pelo fato de que a dita disposição de controlador inclui disposição para identificar o dito canal selecionado da dita pluralidade de canais, pela escolha entre sinais dos ditos sinais de pedido de conversação recebidos sobre os canais correspondentes da dita pluralidade de canais.
- 33 - Rede de comunicação privada, de acordo com a reivindicação 1, caracterizada pelo fato de que um conj unto selecionado da dita pluralidade de conj untos de telefones autorizados inclui:disposições de vocoder para processar digicalmente informação de entrada a fim de produzir uma seqüência de pacotes de dados de vocoder, e disposições de modem para gerar o dito sinal de informação utilizando os ditos pacotes de dados de voccder.
- 44 - Rede de comunicação privada, de acordo 20 com a reivindicação 3, caracterizada pelo fato de que as referidas disposições de modem incluem disposições adequadas para multiplexar o dito sinal de pedido de conversação com os ditos pacotes de dados de vocoder e para usar o resultado durante a formação do referido 25 sinal de informação.
- 55 - Rede de comunicação privada, de acordo ccm a reivindicação 1, caracterizada pelo fato de que as ditas disposições de controlador incluem disposições Zj para verificar que o dito sinal de informação* redèbfdo sobre o dite canal selecionado da dita pluralidade de canais foi gerado por um determinado conjunto da dita pluralidade de conjuntos de telefone autorizados.
- 66 - Rede de comunicação privada, de acordo com a reivindicação 5, caracterizada pelo fato de que as referidas disposições de controlador incluem disposições adequadas para configurar a dita interface de rede telefônica para chamar outros dos ditos conjuntos IC de ceiefones autorizados subsequentemente ac. recebimento, pele aitc· gerenciador de chamadas de rede, do· dite sinal de informação proveniente do referido determinado conjunto da dita pluralidade de conjuntos de telefones autorizados. 15
- 77 - Rede de comunicação privada, de acordo com a reivindicação 1, caracterizada pelo fato de incluir ainda disposições de rede sem fio para acoplar operacionalmente um da dita pluralidade de conjuntos de telefones autorizados a um canal correspondente da re20 ferida pluralidade de canais.
- 88 - Rede de comunicação privada, de acordo com a reivindicação 1, caracterizada pelo fato de que cada um da dita pluralidade de conjuntos de telefones autorizados inclui disposições adequadas para gerar um 25 sinal criptografado pela criptografação de um sinal de informação proporcionado por um dos referidos usuários membros, senão o dito sinal criptografado transmitido sobre um canal correspondente da referida pluralidade a » »«« ♦ · · · * · · • a··* · · ♦ a · · · A jatittit* · ·· * 1 *. * ·«» · · · · · a a·a a a a · · · « • é · t · · · · · * · cie canais.
- 99 - P.ede ae comunicação privada, de acordo com a reivindicação 8, caracterizada pelo fato de que cada um da dita pluralidade de conjuntos de telefones aucorizados inclui disposições para recuperar um dos ditos sinais de informação a partir de um dos ditos sinais criptografados transmitidos sobre um canal corresponaente dos ditos canais.
- 1010 - Em um sistema de comunicação em que usuários se comunicam através de uma rede telefônica de linhas comutadas, um gerenciador de chamadas de rede para facilitar a comunicação privada entre um conjunto de usuários membros, caracterizado pelo fato de gue o dito gerenciador de chamadas de rede compreende:uma interface de rede telefônica para estabelecer uma ligação telefônica com cada um de uma pluralidade de usuários membros sobre uma pluralidade de canais correspondentes da dita rede telefônica de linhas comutadas;uma matriz de chaves, acoplada à dita interface de rede telefônica, para proporcionar um sinal de informação recebido sobre um canal selecionado da dita pluralidade de canais, a outros da dita pluralidade de canais por intermédio da oita interface de rede telefônica;e uma disposição de controlador para configurar a dita matriz de chaves em resposta a informação de controle recebida sobre peio menos um da dita plura5 lidade de canais.
- 1111 - Gerenciador de chamadas de rede, de acordo corn a reivindicação 10, caracterizado pelo fato de que a dita disposição de controlador inclui um controlador para selecionar o dito canal selecionado da aita pluralidade de canais, em resposta a um sinal de pedido de conversação recebido sobre o dito canal selecionado da dita pluralidade de canais.
- 1212 - Gerenciador de chamadas de rede, de acordo com a reivindicação 11, caracterizado pelo fato de que inclui ainda uma disposição de rede sem fio para estabelecer comunicação entre pelo menos um dos ditos usuários memores e a dita rede telefônica de linhas comutadas.
- 1313 - Gerenciador de chamadas de rede, de acordo com a reivindicação 12, caracterizado pelo fato de que a dita disposição de controlador inclui uma disposição de aroitrio para escolher o dito canal selecionado da dica pluralidade de canais com base nos sinais de peoido de conversação recebidos a partir dos ditos usuários membros sobre canais correspondentes da dita pluralidade de canais.
- 1414 - Gerenciador de chamadas de rede, de acordo com a reivindicação 13, caracterizado pelo fato de que a dita disposição de controlador inclui uma disposição para informar os ditos usuários membros por intermédio de canais correspondentes da dita pluralidade de canais da identidade de um usuário membro selecionado que proporciona ο dito sinal· ne υη^θίίΜΐ^ :soj;‘r*? ο * dito canal selecionado da dita pluralidade de canais.
- 1515 - Gerenciador de chamadas de rede, de acordo com a reivindicação 14, caracterizado pelo tato de que a referida disposição de controlador inclui uma disposição adequada para informar pelo menos um dos dites usuários membros, por intermédio de um canal correspondente da dita pluralidade de canais, das identidades dos usuários membros, dos ditos usuários membros, 10 associados com os canais correspondentes da dita pluralidade de canais.
- 1616 - Em uma rede telefônica de linhas comutadas que incorpora um sistema de comunicação privado disposto de maneira a permitir a comunicação privada 15 entre usuários membros, um conjunto de telefone autorizado de dupla modalidade acoplado operacionalmente a um canal de telefone da dita rede telefônica de linhas comutadas e disposto para operação em primeira e segunda modalidades, caracterizado pelo fato de que o dito con20 junto de telefone aucorizado de dupla modalidade compreende :disposição de transmissão para: durante a operação na dita primeira modalidade, processar digitalmenoe um sinal de entrada em um sinal de informação digital para propagação sobre o dito canal de telefone, e gerar um sinal de pedido de conversação em resposoa a entrada de usuário predefinida, e para, • · • ft • ft ft · ftftft * *ft · « · · « · • · 9' I * • ftftft ftft' * a v a « Λ ftftft ft ft durante a operação na dita segunda moaalidade, proporcionar um sinal de entrada para o dito canal de telefone;e uma disposição de receptor para: durante a operação na dita primeira modalidade, processar digitalmente sinais de informação transportados pelo dito canal de telefone e para proporcionar os sinais processados resultantes para um dispositivo de saida, e para, durante a operação na dita segunda modalidade, proporcionar sinais de informação transportados pelo dito canal de telefone para o dito dispositivo de saída.
- 1717 - Em um sistema de comunicação privada incorporado dentro de uma rede telefônica de linhas comutadas, o dito sistema de comunicação privada incluindo um gerenciador de chamadas para facilitar a comunicação entre usuários membros através da dita rede telefônica de linhas comutadas, um conjunto de telefone autorizado em comunicação com um canal de telefone da dita rede telefônica de linhas comutadas, caracterizado pelo fato de que o dito· conjunto de telefone autorizado comt-reende:’ uni módulo de transmissão aue inclui: ’· ·.’·,··· · . · · r coneítatiÇ) ct-iftuUávfeí. 1 * • · -· · · * ··· * processar digitalmeninal de informação na mente te um forma um módulo de vocode;a uma poroa de entrada para sinal de entrada em um s de pacote, 5 um controlador para gerar um s inai de pedido de conversação em resposta a entrada de usuário predefinido, e uma disposição de transmissor de enlace inverso para transmitir o dito sinal de informação na 10 forma de pacote e o dito sinal de pedido de conversação sobre o dito canal de telefone, em que o dite gerenciador de chamadas determina o encaminhamento do dito sinal de informação na forma de pacote através da dita rede telefônica de linhas comutadas na base do dito si15 nal de pedido de conversação;e um módulo de receptor adequado para receber sinais de enlace de emissão encaminhados para o referido conjunto de telefone autorizado, a partir de um selecionado dos ditos usuários membros pelo dito geren2Ό ciador de chamadas.
- 1818 - Conjunto de telefone autorizado, de acordo com a reivindicação 17, caracterizado pelo fatc de que a dita disposição de transmissor de enlace inverso inclui:um modem dotado de uma porta de entrada e uma porta de saída, a dita porta de saída estando acoplada a uma entrada de um transmissor, e uma disposição para multiplexar o dito si9 nal de in f o rmaça.o ns rorniã de pádcÇe •ípitcí/jrEfierltjé. ·*υ* * . · * * · · ciito módulo de vocoder com o dito sinal de pedido de conversação e para proporcionar o sinal muitiplexado resultante para a porta de entrada do dito modem. 5
- 1919 - Conjunto de telefone autorizado, de acordo com a reivindicação 18, caracterizado pelo fato de que o dito módulo de transmissão inclui uma chave de entrada interposta entre uma entrada de uma unidade ccdificador/descodifícador e um microfone de entrada, 10 sendo a dita unidade codificador/descodifícador dotada de uma saida conectada a uma entrada do referido módulo de vocoder.
- 2020 - Conjunto de telefone autorizado, de acordo com a reivindicação 19, caracterizado pelo fato 15 de cue a dita chave conecta ο dito microfone de entrada á dita entrada da dita unidade „codificador/descodifícacor quando o dito conjunto de telefone autorizado se encontra operacional em uma primeira modalidade e conecta o dito microfone de entrada à dita 20 entrada do dito transmissor quando o dito conjunto oe telefone autorizado se encontra operacional em uma segunda modalidade.
- 2121 - Conjunto de telefone autorizado, de acordo com a reivindicação 17, caracterizado pele fato 2 5 de que o dito módulo de transmissão inclui ainda uma disposição para criptografar c dito sinal de informação na forma de pacote.
- 2222 - Conjunto de telefone autorizado, de acordo com a reivindicação 17, cafacúeiAíadc· ípeAc‘*faÉo de que o dito módulo de receptor inclui uma disposição para descriptografar os referidos sinais de enlace de emissão. 5
- 2323 - Em um siscema de comunicação em que usuários se comunicam através de uma rede telefônica de linhas comutadas, um processo para facilitar a comunicação privada entre uma pluralidade de usuários membros, caracterizado pelo fato· de que o referido proces10 so compreende as etapas de:estabelecer uma ligação telefônica entre um gerenciador de chamadas de rede e cada um de uma pluralidade de canais de telefone da dita rede telefônica de linhas comutadas, estando cada um da dita 15 pluralidade de canais de telefone associado com um de dita pluralidade de usuários membros;proporcionar um sinal de informação recebido no dito gerenciador de chamadas de rede sobre um. canal selecionado da dita pluraliaade de canais de te20 lefone a partir de um dos ditos usuários membros ativo para outros dos ditos usuários membros sobre outros canais da dita pluralidade de canais de telefone;gerar sinais de pedido de conversação em uma pluralidade de conjuntos de telefone associados com 25 a dita pluralidade de usuários membros para transmissão para o dito gerenciador de chamadas de rede por intermédio da dita rede telefônica de linhas comutadas;e selecionar o dj to USllárif, membro eti vo rr,m base nos ditos sinais de pedido dê cc-nversaçao ‘Recebidos no dito gerenciado!;de chamadas de rede.
- 2424 - Processo, de acordo com a reivindicação 23, caracterizado pelo faco de que inclui ainda a 5 etapa de identificar o dito canal de telefone selecionado pela seleção entre os ditos sinais de pedido de conversação recebidcs sobre os canais correspondentes da dita pluralidade de canais de telefone.
- 2525 - Processo, de acordo com a reivindica10 ção 23, caracterizado pelo fato de que inclui ainda as etapas de processar digicalmente informação proveniente do dito usuário membro ativo com a finalidade de produzir uma sequência de pacotes de dados de vocoder para transmissão de modem para o dito gerenciador de chama15 das de rede.
- 2626 - Frocesso, de acordo com a reivindicação 23, caracterizado pelo fato de que inclui ainda a etapa de acoplar o dito sinal de informação proveniente do dito usuário membro ativo através de uma rede de co2C municação sem fio para o dito canal selecionado da dica pluralidade de canais de telefone.
- 2727 - Processo, de acordo· com a reivindicação 23, caracterizado pelo fato de que inclui ainda as etapas de:25 criptografar sinais de informação gerados dentro do um da dita pluralidade de conjuntos de telefone associados com o dito usuário membro ativo;transmitir os sinais de informação cripto-12grafados para o dito gerenciador dê cnamàêia£**de ·2*οόέ;;e descriptografar os sinais da informação criptografados recebidos a partir do referido gerenciador de chamadas de rede nos conjuntos da dita pluralidade de conjuntos de telefone associados com os ditos usuários membros dos ditos usuários membros.
- 2828 - Em um sisrema de comunicação em que usuários se comunicam através de uma rede telefônica de linhas comutadas, uma rede de comunicação privada para facilitar a comunicação entre uma pluralidade de usuários membros, caracterizada pelo fato de que a dita rede de comunicação privada compreende:um çerenciador de chamadas de rede que inclui : uma interface de rede telefônica para estabelecer uma ligação telefônica com cada uma de uma pluralidade de linhas telefônicas da dita rede telefônica de linhas comutadas, estando cada uma da dita pluralidade de linhas telefônicas associada com um da dita pluralidade de usuários membros, uma matriz de chaves, acoplada à dita interface de rede telefônica, para proporcionar um sinal de informação recebido sobre uma selecionada da dita pluralidade de linhas telefônicas para outras da dita pluralidade de linhas telefônicas por intermédio da dita interface de rede telefônica, e uma disposição de controlador para configurar a dita matriz de chaves em resposta a sinais de cedido de conversação recebidos sol?re õ..’c5. téj plúbàicfede de linhas telefônicas;e uma pluralidade ae conjuntos de telefone autorizados dispostos para comunicação sobre a dita 5 pluralidade de linhas telefônicas, sendo que cada um dos ditos conjuntos de telefones autorizados inclui uma disposição para gerar um dos ditos sinais de pedido de conversação.
- 2929 - Rede de comunicação privada, de acor0 do com a reivindicação 2 , caracterizada pelo fato de que a dita disposição de controlador inclui meios para identificar a dita linha telefônica selecionada pela seleção entre sinais dos ditos sinais de pedido de conversação recebidos sobre linhas correspondentes da dita 5 Dluraiidade de linhas telefônicas. ι Η (Λ ÍX π -Τ± VJ Ο \ο 5 CJ 2 co Ω 2 Ο bC Ό ~tÕBHHiV $ω Λ- ω f£ OQ Q co uj ιη ιη Ω ω k ΊοΠΠΠ/ IWnFV
Independent claims29
122 paragraphs in 5 sections, as filed
(54) Title: Process and device to provide a private communication system over a public telephone network.
(30) Unionist Priority: Oi / O2'i996usoa / E95.566 (71) Depositor (s): Quatomin Incorporated (US) (72) Inventor (s): MatthewS. Grob.Sle.tn LRogers.Enc J. Lekven.byron Y Yafuso (74) Attorney VeTano and Associated Lawyers (86) International Request; pct uss7xns2i ae29.01 / 1997 (87) International Publication: wo 97,23656 of O7.oe.-1997 (57) Abstract: process and apparatus to provide a PRIVATE COMMUNICATION SYSTEM IN A PUBLIC PHONE NETWORK. In this context, a private switching network is exposed through which a plurality of member users communicate using the public telephone network (PSTN) (10). Each member uses either a modified landline telephone (46) connected to the PSTN (101. or a modified mobile telephone (22) connected operatively to the PSTN via a wireless communication system (14). The particular communication network induces the area call manager (40) dated from a telephone network interface (92) to establish a telephone connection with each of a plurality of telephone lines (44 / from PSTN (10), each pl ura Age of telephone lines (44) is associated with one of a plurality of member users. The network call manager (40) also indulates a switching matrix (110) which is coupled to the telephone network interface, designed to provide an information signal received from an active member user, over a selected telephone line, for the remaining non-targeted member users.
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PROCESS AND APPARATUS TO PROVIDE A BB SYSTEM
PRIVATE COMMUNICATION IN A PUBLIC PHONE NETWORK
Background of the Invention
I. Field of the Invention
The present invention is generally referred to collective line communication systems and, more particularly, to a private bridge communication network — a very many point which is incorporated directly into a cellular telephone or land line system.
II. Description of the Related Art
The mobile cellular telephone service has been in use for some time and has traditionally been characterized by a central location that transmits with high power to a limited number of mobile or portable units in a large geographic area, lio previous cellular systems only a number of Limited radio channels were available, thus limiting the number of radio conversations within an entire metropolitan area to the number of channels available.
Modern cellular radio telephony systems have a comparatively large number of radio channels, which can be effectively multiplied by using identical radio frequencies within different smaller coverage areas (ie cells) that comprise a given service territory. Each cell includes a cell site transmitter, or base station *, õ jqúhlLprotxu *? cior.a irradiation under a selected power level, with the purpose of ensuring signal reception at the cell boundary without unduly interfering with reception in adjacent cells. Bait allows the channel frequencies used in one cell to be re-used in another cell geographically separated from it, according to a predetermined plan. In this way, a large number of channels may be available in a metropolitan area and the service provided by them may be identical to a standard telephone line.
• ··
There are numerous standards for the implementation of cellular telephone communications. These standards include the advanced mobile phone system (AÍ-ÍPS1, c Global System for Mobile Communication (GSM), the Code Division Multiple Access- (CDMA.). The CDMA spread spectrum modulation technique has advantages significant changes over other modulation techniques for multiple access communication systems, for example, the use of CDMA. results in a much higher spectral efficiency than can be achieved using other multiple access schemes.
Although recent development efforts have made CDMA possible. and other cellular systems to effectively provide point-to-point communication links between users, however, several public agencies and fcíiVácÉas · ten / • fl · ♦ * «♦ · ♦ · fl flflflfl flfl ··· ♦ tinuadc to be based on dedicated terrestrial mobile radio communication networks (MRLs). This is a consequence of the inability of cellular systems to establish point-to-point communication networks between a set of member users. For example, agencies that enforce local laws use MRL networks, in which a closed radio communication system is established through repeater stations. These networks
Local MRLs are often characterized by pressure operation for ίΡΤΤ'ι conversation, in which users press a hand-held or similar conversation button when they want to radiate vocal information to other user members. Nevertheless, the infeasibility of providing repeater stations over a wide geographical area, limits the extent to which the set of member users can be dispersed geographically.
Although cellular landline and conventional telephone systems are capable of facilitating communication between widely separated users, closed PTT communication networks have so far not been incorporated into any type of system. This may be due in part to the lack of a convenient mechanism for automatically joining a set of identified users on such a closed network. Furthermore, even if such a mechanism were available, the two types of systems
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,. ααααΑ ··· αα «· αα» are easily compromised by third parties 'nao' & ιΑονΐ<sup>2</sup>** <sup>: </sup>and thus unsuitable for secure communication.
The conference call capacity 5 provided by both cellular and land line carriers is also an inadequate subrogate for a PTT-type communication network. In particular, the conference call between users within different cell or land line systems requires a degree of prior coordination with the responsible service provider. In addition, in many conference call systems, the information signals from the conference call participant are combined and the resulting composite signal is universally provided to each of these participants. This effectively prevents each of these information signals from being separately encrypted as a means of increasing security and communication, since the separately encoded information signals will not generally be recoverable from the composite signal.
Consequently, it is an objective of the present invention to incorporate a private communication area directly within a cellular and / or landline telephone system, in such a way as to avoid the need for prior coordination with a telephone service provider.
Another objective of the invention «· ·« · »» »b · bb <« ·· ** ♦ ** ··· «« 4 * «l 4 4 * 4 *» »« · that the communication network deprives imitate a * · network * characterized by PT? operation.
It is yet another objective of the present invention that the control of the private communication network is located within a network call manager connected separately to an existing landline telephone system.
It is another objective of the present invention to ensure that coding techniques have the ability to be applied within the private communication network as a means of increasing communication security.
Summary of the Invention
Ρ. The present invention relates to a private communication network through which a plurality of member users communicate using the public telephone network (PSTN). Each member user uses either a modified landline phone connected directly to the PSTN, or uses a modified mobile phone operationally coupled to the PSTN via a wireless communication system. The private communication network includes a network call manager, which is equipped with a telephone network interface that is suitable for establishing a telephone connection with each other and with a plurality of PSTN telephone lines. Each of the plurality of telephone lines is associated with one of the member members of the plurality of member users.
Call manager gives «? De: includes: ··:
in addition, a telephone line switching matrix, coupled to the telephone network interface, to provide an information signal received from an active member user over a selected telephone line for the remaining non-active member users. A network manager controller identifies the active member user based on the conversation pressure request signals (PTTl received from member users' phones over a plurality of phone lines. The active member user can be identified as, for example, For example, the .member user from which a PTT request signal is first received, after the previously active member user has forwarded the conversation privileges. Alternatively, the active member user can be chosen using predefined user priority criteria to evaluate all PTT request signals queued by the network call manager.
Each member user's telephone set will typically be capable of both standard telephone operation and PTT operation over the private communication network. When configured for PTT operation, each telephone handset receives and digitally processes voice information or input data from a member user. The resulting vocoder data packets, as well as any ôe PTT request signals initiated by the meilbrij user, ^ *: £ ã<sup>f</sup>5.! tntaCJ ^ i ** provided to a modem for reverse link transmission via the PSTN to the telephone network interface of the network call manager. The security of the private FTT network may be increased when each telephone handset is configured in a way that will encrypt all of these reverse link transmissions, as well as in order to decrypt correspondingly the emission link information from the active member user.
Brief Description of the Drawings The objectives and additional aspects of the invention will become more readily apparent from the following detailed description and the attached claims, when observed in conjunction with the attached drawings, in which:
Figure 1 illustrates the elements of an exemplary telephone system illustratively within which a PTT point-to-multipoint private communication network of the present invention can be established.
Figure 2 represents a block diagram of an exemplary network call manager for the FTT private network of the present invention.
Figure 3A shows a block diagram of a land line PTT dual mode telephone comprised of a transmission section and a reception section.
Figure 3Ε illustrates the teljâ fcjne ;; PTT -deíj dual landline modality of Figure 3A when modified to facilitate encrypted communication within a private PTT network.
Figure 4 represents a block diagram of a dual-mode AMT PTT telephone.
Figure 5 represents a block diagram of a CDMA cell phone configured for use within a private PTT network of the present invention.
Figure 6 provides a functional block diagram of a network call manager designed for use within a private PTT network in which signaling is done using analog tones; and
Figure 7 shows a landline phone configured to communicate with a network call manager that uses analog tones.
Detailed Description of Achievements
Favorites
I. Structure of the Private PTT Network
Figure 1 illustrates, in an illustrative way, the elements of an exemplary telephone system within which a private PTT point-to-multipoint communication network (private PTT network) according to the present invention can be established. Referring to Figure 1, the exemplary telephone system includes a public telephone network (fSTN) 10, a call system: *:
• 4 · · · 4 0 0 · «· CDMA 14 and an analog cellular communication system (AMESj 18. The CDMA 14 system provides service for CMDA-compliant mobile radioteiefones (CDMA mobile) 22 and 24, while the AMES system 18 facilitates communication with users of mobile radioteiefones compatible with AMPS (mobile AMES) 28 and 30.
A network call manager 40, connected through a plurality of T1 channels 44 to PSTN 10, operates as described below to create a private communication network between a plurality of corresponding member users within the exemplary telephone system of Figure 1.
The private communications network may include member users served by one or both CDMA and ΑΜΡΞ 14 and 18 cellular systems, and / or may include one or more member users connected directly to PSTN 10 via modified landline phones such as phone 48. Although the CDMA and AMPS cellular systems are illustrated as being incorporated within the exemplary embodiment of Figure 1, it should be understood that the teachings of the present invention are pertinent to other cellular air interface standards as well as, for example, the Global System for Mobile Communications (IGSM) and Time Division Multiple Access (TDMA). A brief description of the constituent elements of the cellular communication systems CDMA and AMPS 14 and 18 illustrated will be provided.
Q; qqra<sup>:</sup>, -Ij & U- \<sup>:</sup> details of the operating principles of the present invention.
CDMA 14 cellular communication system includes a plurality of cells, two of which are identified in Figure 1 as including cell sites (i.e., base stations) 56 and 53, Each cell can be divided into a number of sectors, where communication with CDMA 22 and 24 mobile within a given sector is handled by a cell site transceiver that provides radio coverage over the sector. Base stations 56 and 58 operate in such a way as to receive and transmit the signals that enable a radio transceiver within each CDMA unit to communicate with PSTN 10. In the CDMA 14 system, data packets are used in the exchange of information in the air between the base stations 56 and and the mobile of CDMA 22 and 24.
.Phone calls are from base stations the mobile CDMA 22 and mobile CDMA (MSC) 60, cell location and a center of mind within a center (not shown). The purpose is to provide mobile connections of CDMA 22 and 24 and the MSC 60 performs functions such as the modems of the MSC 62 and the forwarded and 56 between switching, which will be located typical of the main mobile phone switching of the MSC 60 is of vocal path between the PSTN 10. For this purpose, the Como, mobile measurement data of CDMA 22 and 24 using the appropriate CDMA base station of * 56<sup>J</sup> or 58 *. <sup>k</sup>*0 *
MSC 60 also performs other tasks, including paging a mobile CDMA, when a call is received from PSTN 10 and switching calls to the PSTN lines that are available through a plurality of Tl 64 channels. One set of modems from MSC 62 serves to convert the digital information signals received from the CDMA 22 and 24 mobile phones into analog signals suitable for
1C transmission over PSTN 10, and in a similar way converts the analog signals from PSTN 10 into digital signals subsequently provided for the CDMA 22 and 24 furniture.
AMPS cellular communication system
18 also includes a number of cells, two of which are identified in Figure 1 as including cell site base stations 70 and 72. Each cell can be divided into a number of sectors, where communication with mobile AMPS 28s and 30 within a given sector is manipulated by means of a cell site transceiver that provides radio coverage over the sector. Telephone calls are routed through cell site base stations 70 and 72 between AMPS mobile units 28 and 30 and an AMPS mobile communication center (ICMS) 7 6, which is coupled to PSTN 10 via a plurality of Tl 80 channels.
II. Private PTT Network Operation • 8 fc ff * v 8 <8 8 »f 4 8
<td></td><td></td><td>Turning now to</td><td>Figure? 2,: f J £ + Ξ · 3; 5 ^ s'<sup>,</sup></td><td> ·· * r ^ -:: »» *> </td>
<td>ference</td><td>to</td><td>block diagram</td><td>of a manager</td><td>in</td>
<td>calls</td><td>in</td><td colspan="2">exempiifreativo network 40 in description</td><td>gives</td>
<td>operation</td><td>gives</td><td>private PTT network</td><td>of the present invention</td><td>to.</td>
The way in which the landline or cellular phones associated with each member user are configured for cooperation with the network call manager 40 will be described below with reference to the
Figures 3-5. In what follows, the communication links from the modified landline telephone 48, from the AMPS mobile 28 and 30, and from the CDMA mobile 22 and 24, to the network call manager 40 through PSTN 10 , are called inverse links. It is assumed that the reverse link that is associated with the member user currently designated by the network call manager 40 as the active member user is the only one of the inverse links that carries valid voice or data information. All other inverse links are available for use in providing signaling information to the network call manager 40. Each broadcast link via PSTN 10 from network call manager 40 for each member user carries the voice or data information provided by the active member user. As described in this context, the network call manager 40 is reconfigured with each new identification of an active member. This reconfigur13 ·· 4 ·· * · 444 · 44 *
1 * 4> 44 444 4> 4 44 ration results in the vocal information or <J * and Jlcrffcfc «tj · .: ·; inverse lace from the newly identified active member user will be provided for the issue links that are associated with all other member users, including the issue link of the previously active member user.
network call manager 40 includes a network controller 90, within which is stored at least a list of telephone numbers associated with users who are members of a first private PTT network. When it is desired to provide access to the first private PTT network, a member user who makes the call dials an access number that identifies the first private PTT network. 0 network painters 90 can also store other member user lists, each list being associated with a unique access number and defining a separate private PTT network.
The network call manager 40 is designed to present itself to PSTN 10 as if it were a private automatic station system (PBX) and, thus, the call placed by the member user who makes the call can be received over any of the channels TI 44. In this regard, a telephone network interface (Tl) 92 is provided to form a connection between the Tl 44 channel associated with the calling user member and one of a plurality of network manager modems 99. As is described in this context, the interface El: 92tíarra; 'Vrn to connect several other network manager modems 98 to other Tl 4 4 channels associated with other member users.
In the event that the member user who places the call is answered by the Cõl-IA 14 cellular system, a telephone connection is established while the network call manager moaem 98<sup>1</sup> coupled
<td></td><td>to the Tl channel</td><td> 4 4</td><td>receiving incoming call</td><td>stay</td>
<td> 10</td><td>synced</td><td>with</td><td>o one of the MSC 62 modems (Figure 1)</td><td>in-</td>
<td></td><td>meant for</td><td>The</td><td>call. For a member user</td><td>what</td>
makes a call that has a landline phone or AMPS cell phone, a similar phone connection is established when synchronizing an internal modem (Figures 3A and 4) between the member user's phone and the network manager modem 98 ' receiving the incoming call. In an exemplary embodiment, network manager modems 93 comprise, for example, so-called AMPS modems which are especially suitable for transferring information over air.
When making an incoming call to a private PTT channel that is received from a member user on one of the Tl 44 channels, the Tl 92 interface uses standard techniques to determine the dialed access number during the placement of the call. The number of dial-up access, which corresponds to a particular PTT private network, is communicated by the Tl 92 interface to the network controller 90. The -TÍ f & 'irfcém * cô- ** link Straight the TI 4 4 channel associated with the member user who makes the call to an available network manager modem (.for example, the network manager modem 98'). Once modem synchronization has been achieved, network controller 90 may require the user making the call to provide authentication information used to verify the member status of the user making the call, on the private PTT network identified as corresponding to the called access number. When this memt.ro condition is confirmed, the network controller 90 can then command either the TI 92 interface or a selected network manager modem 96, to start paging the remaining member users of the private PTT network identified. It is observed in this context that in alternative embodiments, the TI 92 interface may comprise an El interface, or several other digital or F5X-type interfaces.
When a first of the other users who are members of the identified private PTT network responds to a network page (that is, a telephone call) sent by the network manager modems that make the call 98, or through the TI 92 interface, a modem synchronization process similar to the type described earlier. In particular, in the event that the called member user is answered by an AMPS telephone or land line, modem synchronization occurs between the modem L-ntêrrõsí ^ D & Vç 0 ** ^ 3 “··· called member user's phone ( Figures 3A and 4) and one of the network manager modems 98. In the event that the called member user is served by the CDMA 14 cellular system, modem synchronization occurs between the network manager modem that makes the call 98 and one of the MSC 62 modems (Figure 1). It should be understood that MSC 62 modems need not be physically close to MSC 6Ô, but that they can be found anywhere else within the telephone system infrastructure.
When the network manager modem that makes the call 98 achieves this synonymization, it produces a LIGAP signal. which is detected by the network controller 90. The network controller 90 can then instruct the network manager moderator called 98 'to send a LIGAP signal. for the member user who originally dialed the access number of the identified private PTT network. 0 The network controller may also periodically send a list to each authenticated participating member of the private PTT network, to be displayed on each authenticated user handset, of the other current participating member users.
A PTT controller 104 is provided to grant conversation or data transmission privileges between two or more member users joined to the identified private PTT network. In particular, the PTT controller 104 is sensitive to request signals for
PTT (PTT requests) generated by Eelêf-jhts;
landline or cellular telephone associated with users who are members of the identified private PTT network. Each PTT request is generated on a member user phone, either in response to the manual engagement of a PTT switch, or in response to a detected vocal activity by the member user. A PTT request from you and a particular member user is detected by modem 98 assigned to it>, which provides the PTT signal to the PTT controller 104.
In an exemplary embodiment, the PTT controller 104 designates as the currently active member user the one from which the first PTT request is received, subsequent to the network conversation privileges being released by a previously active member user. The network conversation privileges are re-linked by the previously active member user, in the case of manual PTT signaling, when the tele20 phone PTT key is released to the speaker. In the case of voice-activated PTT signaling, network conversation privileges are re-linked if one occurs. pause of predetermined duration.
In accordance with an anthernafci25 embodiment, PTT requests received prior to the re-link of network conversation privileges by the currently active member user, are queued. When the currently active member user subsequently re-enters the privileges of the network conversation, the threaded PTT peers are evaluated according to predefined criteria to determine the next currently active member user. These predefined criteria may include, for example, the priority of member users, as well as the order in which queued orders are received.
The network call manager 40 can also employ other techniques to select a new active member user on the basis of received PTT requests. For example, each user member of a particular private PTT network can be assigned a priority level within the network. In this case, when a PTT request is received from a higher priority member user than the currently active member user, the network call manager 40 establishes the preemption right over the currently active member user and grants the privileges o and network chat to the highest priority member user. It is also possible for each member user to be allowed to change his priority within prescribed limits known to the network call manager 40 as a means of obtaining network conversation privileges under urgent circumstances.
After one. new active member user has been identified by the PTT controller 104 based on the received FTT requests, the PTT controller 104 configures a multi-computation key 110 to accept voice or reverse link data information * exclusively from modem 95 associated with the currently active member user. That is, the reverse link information from each of the other modems 9a, each of which has been assigned to one of the remaining (ie, non-active) member users, is ignored by the multi-computation key 110, 0 PTT also configures the multi-computation key 110 to provide the reverse link information accepted from the newly identified active member user to the modems 95 associated with each of the non-active member users. Since PTT requests are transmitted only on inverse links from non-active member users, advantageously these PTT requests do not interfere with the receipt of reverse link information from the active member user.
Although the broadcast links of each of the private PTT networks are used nominally to carry information from the active member user to all other member users, the 10-S network controller can also transmit system condition information about the broadcast links during pauses or intervals in the transmission of information by the active member user. In an exemplary embodiment, this system condition information includes the following:
(i) eligible member users (phone number, name, priority) of a particular private network and PTT, · * <sup>:</sup> ··* <sup>:</sup> * · 'Ί ί ·· íii) member users (phone number, name, priority) simultaneously connected to the particular PTT private network, (iii) the currently active member user phone number, name, priority), and (iv) the queue of member users (phone number, name, priority, order order) who provided PTT requests to the PPT controller
90.
Network status information is received and displayed by the phones associated with the member users. The following section provides a description of the particular implementation of dual modality PTT telephones suitable for use within a private PTT network of the invention.
III. Landline and Cellular PTT Dual Mode Telephones.
Referring now to Figure 3?., 20 a block diagram of a dual-line landline PTT telephone comprised of a transmission section 140 and a reception section 142 is illustrated. The transmission section 140 of the dual-mode telephone in Figure 3A is configured for standard telephone operation when input switch 14S is turned to pole 150, thus coupling input microphone 154 to PSTN 10. A. input key 14 3 is turned to pole 15S when it is desired to configure the transmission section 140 for operation * of 2 ^ ½ âèstsà be · a private PTT network. Similarly, receiving section 142 is set for standard telephone operation when receiver key 162 is facing pole 163, and is set for PTT operation when receiver key 162 is facing pole 166.
During PTT operation, the vocal information from microphone 154 is coupled by key 148 to an encoder, 'decoder 172, encoder / decoder 172 is arranged to transform this analog voice information, or data data from a peripheral device. (not shown; coupled to key 148, in a waveform modulated in pulse code íPCMj for a vocoder 176. In an exemplary embodiment, vocoder 176 is made in accordance with the EIA / TIA IS-96A standard, and operates in such a way as to convert the incoming PC waveform into a sequence of vocoder data packets. These vocoder data packets are fed to a first input of a microprocessor 178, which is also provided with a second input coupled to a PTT processor 184 and an output coupled to a modem 130. When a PTT key 183 is engaged by the associated member user, the PTT processor 184 pro25 delivers PTT data packets to the second input of microprocessor 173. Microprocessor 178 then merges the PTT data packets with the data packets of vocoder and provides the result for the modem
180, which is synchronized with one of the * m-idfiRii fíè ίΟ ^ ϊ ^ Λ ** · network creator 98 during PTT operation. Although the PPT processor 184 is illustrated as being distinctly different from microprocessor 178, these two functional elements may be incorporated within a single microprocessor unit.
The receiving section 142 includes a modem demodulator 192, which is also synchronized with an accompanying network manager modem 98 within the network call manager 40 during PTT mode operation. The vocoder data packets generated by the second modem 192 in response to the broadcast link information from the accompanying network manager modem 98 are provided to an IS-96A receiver section vocoder 196 which, in turn, produces a signal of PCM from vocoder data packets received for use by a receiving section encoder / decoder 200. The analog output from the encoder / decoder 200 is then applied to a conventional telephone speaker 204. It should be noted that the functions performed by encoders / decoders 172 and 200 may be performed by a single device. In a similar way, the encoding function of vocoder 176 can be combined with the decoding function of vocoder 196 in a single device.
As found inc · ic4dô ·· gfeTJaf i ·· • · ·· «· · ··· * ·
3A, certain information received from the network manager unit 40 by the receiving section 142 may be provided to microprocessor 178 via signal line 212. This information may include various network condition data (for example, network identities). other participating member users, currently active member user) to be provided by microprocessor 178 for a conventional dispiay 214 (for example, LCDJ screen.
Figure 3B illustrates the dual-mode landline PTT telephone of Figure 3A when modified to facilitate encrypted communication within a private PTT network. Specifically, the alternate transmission section 140 'to the telephone of Figure 3A includes an encryption module 210 that is interposed between the IS-96A vocoder 176 and the microprocessor 173. In an exemplary embodiment, the encryption module 210 operates in a way to encrypt 20 to vocoder data packets according to an industry standard algorithm such as, for example, the Data Encryption Standard (DES). In a similar way, it is observed that an alternative reception section 142 'includes a decryption module
214 to remove the encryption of the vocoder data packets produced by the second modem 192. It should be noted again that the functions performed by the encoders / decoders 172 and 200 may be • · · ft · «Λ <41 * · · # • *; ; j. * ·;<sub>β</sub>· · · * J * »··· a · β ·« a ι performed using a single device: * £> and similar, the encoding function of vocoder 176 can be combined with the decoding function of the 19th vocoder in a single device. In addition, the functions of the encryption module 210 and decryption module 214 can also be combined into a single device. The landline and cellular telephones associated with all users who are members of a particular private PTT network capable of participating in encrypted communication will be similarly configured with similar type encryption and decryption modules.
When the landline phone user in Figure 3B has been designated as the currently active member user, microprocessor 178 will generate an encryption identification number (ID) for transmission to network call manager 40. k lD encryption is associated with a private key used to decrypt the encrypted information produced by the a cryptography module 210. The network call manager 4 0 multi-computes the IC cryptography for each of the phones associated with the non-active member users (ie, who are not speaking; the rest, each of which includes a decryption module similar to the decryption module 214. Each decryption module will typically include a table query that identifies the associated decryption key * fl · »fl flflfl fl flflfl • · ♦ · * flflflfl · fl * fl * fl * flflfl * flflfl flfl with each encryption. Thus, ..fadaZusuLrió '*: non-active member has the ability to decrypt the encrypted information from the currently active member user at the reception of the encryption ID
provided in that way.
Turning now to Figure 4, a block diagram is provided that illustrates a dual mode PTT telephone AMPS, comprising a transmission section 24 Ü and a reception section 242. A. transmission section 240 of the AMPS dual mode PTT telephone in Figure 4 is configured for standard telephone operation when the 24S input switch is turned to pole 250, thus coupling the input microphone 254 to the AMPS 255 transmitter. Input switch 246 is turned to pole 256 when it is desired to configure the transmission section 240 for PTT operation within a private PTT network. Similarly, the receiving section 242 is set for standard telephone operation when the receiving key 262 is turned to pole 266 and is set for PTT operation when the receiver key 262 is set to pole 266 .
During the PTT operation, the vocal information from the microphone 254 is coupled by the key 248 to an encoder / decoder 272. The encoder / decoder 272 is arranged in such a way as to transform this analog vocal information into a pulse-shaped form modulated in a pulse code. (PCM) proporcio26 · «I · t ·. I. * nothing for an IS-95A 276 vccoder.<sup>1</sup> The resulting vocoder data can then be optionally encrypted by an encryption module 278. When encryption is not desired, the vocoder data packets are fed to a 279 microprocessor for interleaving with the PTT packets coming from a PTT 284 processor. Again, PTT packets are generated by the PTT 284 processor in response to the engagement of the PTT 288 key. The resulting interleaved vocoder data and PTT packets are then processed via a transmission path modem 230 and provided to the AMPS 255 transmitter for transmission to the AMPS 70 or 72 base station. In an alternative embodiment, the data information from a peripheral device (not shown) can be fed to the encryption module 273 or directly to the microprocessor 27 9.
The receiving section 242 includes an AMPS receiver 291 for receiving the broadcast link information provided by the network call manager 40. The analog output from the AMPS receiver 291 is coupled to a receiving path modem 292, which is synchronized with a network manager modem 98 during PTT operation. The vocoder data packets generated by the receiver path modem 292 are provided for a decryption module · 294 during periods of private encrypted PTT communication. QLS & ndc..â5 cíáptctgzn ·· 5 faction is not performed, the vocoder data packets are processed by a reception section vocoder 296 operational in order to produce a PCM signal for use by a reception section encoder / decoder 300. The analog output from the encoder / decoder 300 is then applied to a conventional telephone speaker 304. When encryption is effective, the private, similar network condition information received from the network manager unit 30 is decrypted and provided to microprocessor 178 via signal line 212 '.
As described with reference to t
Figures 3A and 3B, it should be noted again that the functions performed by encoders / decoders 272 and 300 can be performed by means of a single device. Similarly, the vocoder 276 encoding function can be combined with the vocoder 296 decoding function in a single device. In addition, the functions of the encryption module 278 and decryption module 294 can also be combined into a single device.
Figure 5 provides a bio2 diagram of a CDMA cell phone configured for use within a private PTT network. The CDMA cell phone in Figure 5 is comprised of a CDMA 34Ü transmission section and a
V ··· ··· I * β • · ·· ··· · „·. · · · · · ·· * *
--- · - ·; ·· <·· ('1ι' Λ. · ·
CDMA 342. During the operation of ΡΤΤ, í iríroíiftaÇírcí vncaJ coming from microphone 354 is provided for a coder / decoder 372 arranged to produce a waveform modulated in pulse code PCM; . The PCM waveform is provided for a vocoder 376, which in turn generates vocoder data packets for optional encryption within a 373 encryption module. When encryption is not desired, the vocoder data packets are fed to one. microprocessor 379 for interleaving with PTT c packets from a PTT 364 processor. Again, PTT packets are generated by the PTT 384 processor in response to the engagement of the PTT 368 key. The merged vocoder data and PTT packets are then provided by microprocessor 379 to CDMA transmitter 355.
The CEMA receiver section 342 includes a CDMA receiver 392, which generates vocoder data packets in response to broadcast link information from network call manager 40. The vocoder data packets are provided for a module 394 encryption during periods of proven encrypted PTT communication. When encryption is not in effect, the data packets and vocoder are processed using a CDMA 396 receiver section vocoder that operates to produce a PCM signal for use by an encryption / deode decoder. CDMA 400 reception. The <χΐίί.ΐ analogue pain / scaler output then applied to one from *:.
phone speaker receiver section
CIMA 400 is conventional 404. The functions of the encoders / decoders 372 and 400 can be performed within a single device, just as the functions of the vocoaers 376 and 396 may also be performed within a single device. In addition, the functions of the encryption module 37ô and the decryption module 394 can also be combined in a single device.
IV. Analog PTT Private Network
A. Figure 6 provides a functional block diagram of a 450 network call manager that is designed for use within a private PTT network in which signaling is performed using analog tones. The network call manager 450 includes a network controller 490, within which one or more lists of numbers and phones which are associated with the member users of the corresponding private PTT networks are stored. When it is desired to gain access to a particular PTT private network, a member user who makes the call dials an access number which identifies a particular PTT private network.
network call manager 4 50 is designed to appear on PSTN 10 as a particular automatic station system (PBX) would do, and thus the
ΑΑβ * Α · ΑΑ Α ··· · · · • Α Α Α Α Α Α Α Α Α Α «ΑΑ Α« Α Α ΑΑ Α Α Α Α ΑΑ call placed by user member fqufc .SSet ^ ü * a<sub>; i</sub>* chA - '* mada may be received by the Tl 44 channel associated with any one of a plurality of network manager tone detectors 4 98. A tone detector 4 98 'that receives the incoming call prints a detection signal on its output line 500', which is detected by the network controller 490. The network controller 490 then begins to scan the sequence of tones detected by the network manager tone detector called
496 'for the purpose of authenticating the PTT user making the call.
Once the dial-up access number has been recognized by the 490 network controller and the associated users of the private PTT network have been identified, the 490 network controller starts paging the members of the private PTT network
I identified about the remaining 44 Tl channels using standard telephone network procedures. Upon detecting that a first of the other users who are members of the private PTT network responds to a network call, the network controller 490 sends a CONNECT signal in the form of tones to the member user who originally dialed the access number of the private PTT network. Identified PTT - thus indicating to the member user who made the call that at least one other member user has joined the identified private PTT network.
A 5U4 PTT controller is provided to provide it a aa a aaa aaa ai conversation privilege agreement between two or more ünitlotf member users: à 'x ^ etíe ^ pbívada de identified PTT. In particular, the PTT controller 504 is sensitive to PTT request signals, in the form of one or a combination of analog tones (PTT tone requests), generated by the telephones associated with the members of the identified private PTT network. Each PTT tone request is generated on a member user phone either in response to the manual engagement of a PTT key, or in response to detected vocal activity by the member user. A PTT tone request from a given user is detected by the tone detector 49Ô assigned to the user, which then provides a PTT request signal from the PTT controller 504 over one of the output lines 500. According to an exemplary embodiment, the PTT controller 504 operates in a manner that designates conversation privileges among the remaining member users in the manner described above with reference to the PTT controller 104 (Figure 2).
After a new active member user has been identified by the PTT controller 504 on the basis of received PTT tone requests, the PTT controller 504 configures a multi-computation key 510 to accept voice information or reverse link data. exclusively from the TI 44 channel associated with the currently active member user. That is, the reverse link information from each of the other Tl channels, each of which has been assigned to one of the remaining member users (ie · ê ·, * <sup>:</sup>no * • atTvòs) is not very computable by the multi-computation key 110. The PTT controller 504 also configures the multi-computation key 504 to provide the inverse lace information accepted from the newly identified active member user to the Tl channels associated with each of the non-active member users. Since PTT tone requests are transmitted only on inverse links from non-active member users, these PTT tone requests advantageously do not interfere with receiving reverse link information from the active member user.
Although the broadcast links of each private PTT network are nominally used to carry voice or data information from the active member user to all other mere►bros users, the network controller 504 may also transmit system condition information about the broadcast links during pauses or intervals in the transmission of information by the active member user. According to an exemplary embodiment, this condition information includes the following:
(i) eligible member users (phone number, nc-me, priority) of a particular private PTT network, (ii) member users (phone number, name, priority) simultaneously joined to a particular private PTT network, (iii ) the member user * currently active phone number, name, priority), and (iv) the queue of member users phone number, name, priority, order order) that provided PTT tone requests to the 490 PPT controller .
This information can be transmitted using sequences of tones or combinations of tones capable of being detected inside the phone of each member user. Diverse private PTT network information (ie lists of member users, priorities) can be stored within each member user's phone, and specific entries retrieved for display upon receipt of the associated tone or combination of tones from the call manager 450. In this regard, a landline telephone configured for use within a private PTT network orchestrated by the network call manager 450 is described immediately below with reference to Figure 7.
With reference to Figure 7, there is illustrated a block diagram of a landline PTT telephone that has transmission and reception sections 540 and 542 designed for communication using analog tones. During PTT operation, an input switch 54S is set at terminalmerite for pole 550 by the PTT processor 552 in order to couple voice information from an input microphone 554 to the PSTN. However, the PTT 560 switch is engaged by the associated member user, the PTT processor 552 sets switch 548 to pole 562 and enables the tone generator 566. This allows requests for PTT tones generated by the tone generator 566 are transmitted through the PSTN to the
Network call manager 450.
The receiving section 542 includes a speaker 566, and an internal tone detector 570 to detect analog tones or combinations of them transmitted by the network call manager 450 during operation in PTT mode. These tones or combinations of tones can be used to carry a variety of condition and control information to the PTT telephone in Figure 7. In the exemplary embodiment, this information may include:
(i) identification of the currently active member user (name, priority ;, iii) an indication that the member user 20 associated with the PTT phone has agreed to chat privileges, (iii) notice that the chat privileges of the member user associated with the PTT phone are being revoked in favor of a higher priority member user, and (iv) identification of currently joined member users
Each to the * / TT private network. tone or combination of tones tera asso35
0 00 000 0000 0
40000000 0000
0 A cord with a different tieAeáçem · * feature is stored inside a 574 display processor. In response to each tone or combination of tones detected, the 574 display processor provides the associated message for a 578 alphanumeric display. 0 control and condition information listed above are intended to be merely exemplary, and in alternative embodiments, other types of information may be provided to the PTT telephone by the network operator.
The foregoing description of preferred embodiments is provided for the purpose of enabling anyone skilled in the art to produce or make use of the present invention. The various changes in these embodiments will be readily apparent to those skilled in the art and the generic principles defined herein can be applied to other embodiments without the use of the inventive faculty. Thus, it is intended that the present invention is not limited to the embodiments illustrated in this context but that it is in harmony with the broader scope compatible with the principles and new aspects exposed here.
Contents5
10 sheets
Sheet 1 Sheet 2 Sheet 3 Sheet 4 Sheet 5 Sheet 6 Sheet 7 Sheet 8 Sheet 9 Sheet 10
47 members in 22 offices
Priority claims2
| Document | Office | Kind | Date |
|---|---|---|---|
| 59556696 | United States of America | A | |
| 9701521 | United States of America | W |
Members47
| Document | Office | Kind | |
|---|---|---|---|
| ZA97795B | South Africa | B | |
| CA2244929A1 | Canada | A1 | |
| CA2475870A1 | Canada | A1 | |
| CA2481367A1 | Canada | A1 | |
| CA2481368A1 | Canada | A1 | |
| WO9728658A2 | World Intellectual Property Organization (WIPO) | A2 | |
| ID15870A | Indonesia | A | |
| AU1848797A | Australia | A | |
| WO9728658A3 | World Intellectual Property Organization (WIPO) | A3 | |
| FI981689A0 | Finland | A0 | |
| NO983546D0 | Norway | D0 | |
| FI981689A | Finland | A | |
| FI981689A7 | Finland | A7 | |
| NO983546L | Norway | L | |
| EP0878103A2 | European Patent Office (EPO) | A2 | |
| IL125610A0 | Israel | A0 | |
| IL125610D0 | Israel | D0 | |
| BR9707264AThis record | Brazil | A | |
| CN1214842A | China | A | |
| US5912882A | United States of America | A | |
| AR005690A1 | Argentina | A1 | |
| HK1017205A | Hong Kong, China | A | |
| HK1017205A1 | Hong Kong, China | A1 | |
| KR19990082218A | Republic of Korea | A | |
| AU716936B2 | Australia | B2 | |
| JP2000504182A | Japan | A | |
| TW393848B | Taiwan Province of China | B | |
| RU2178957C2 | Russian Federation | C2 | |
| NO316967B1 | Norway | B1 | |
| KR100443781B1 | Republic of Korea | B1 | |
| CA2244929C | Canada | C | |
| EP0878103B1 | European Patent Office (EPO) | B1 | |
| AT320696T | Austria | T | |
| ATE320696T1 | Austria | T1 | |
| MY122360A | Malaysia | A | |
| DE69735478D1 | Germany | D1 | |
| DE69735478T2 | Germany | T2 | |
| ES2264156T3 | Spain | T3 | |
| JP2008099328A | Japan | A | |
| FI119796B | Finland | B | |
| CA2481367C | Canada | C | |
| JP4445005B2 | Japan | B2 | |
| BR9707264B1 | Brazil | B1 | |
| BRPI9707264B1 | Brazil | B1 | |
| CA2475870C | Canada | C | |
| CA2481368C | Canada | C | |
| USRE44577E | United States of America | E |
6 legal events, as the office reported them to INPADOC
Over the term
Point at a mark for the eventEvents
| Event | Code | |
|---|---|---|
| Lapse because of non-payment of annual fees (definitively: art 78 iv lpi, resolution 113/2013 art. 12)LapsedEM VIRTUDE DA EXTINCAO PUBLICADA NA RPI 2499 DE 27-11-2018 E CONSIDERANDO AUSENCIA DE MANIFESTACAO DENTRO DOS PRAZOS LEGAIS, INFORMO QUE CABE SER MANTIDA A EXTINCAO DA PATENTE E SEUS CERTIFICADOS, CONFORME O DISPOSTO NO ARTIGO 12, DA RESOLUCAO 113/2013.B24J | B24J | |
| Lapse acc. art. 78, item iv - on non-payment of the annual fees in timeLapsedREFERENTE A 22A ANUIDADE.B21F | B21F | |
| Patent or certificate of addition of invention granted [chapter 16.1 patent gazette]GrantedPRAZO DE VALIDADE: 10 (DEZ) ANOS CONTADOS A PARTIR DE 18/05/2010, OBSERVADAS AS CONDICOES LEGAIS.B16A | B16A | |
| Decision: intention to grant [chapter 9.1 patent gazette]B09A | B09A | |
| Others concerning applications: alteration of classificationALTERADA PARA INT.CL.2009.01 - HO4W 88/10B15K | B15K | |
| Patent application procedure suspended [chapter 6.1 patent gazette]B06A | B06A |
Numbers
- Application
- 9707264
Titles2
- Portuguese
- Processo e aparelho para proporcionar um sistema de communicação privada em uma rede pública de telefone
- English
- Process and apparatus for providing a private communication system over a public telephone network
Classification
- CPC, 1
- H04W84/16
- IPC, 2
- H04M3 42
- H04W84 16
