304 results about "Group communication systems" patented technology

Methods and systems are provided in a group communication system for dynamically changing a version of a group communication protocol from a first version to a second version transparently to external sources and destinations. The system accommodates newly joining members that can only support versions of the protocol other than the version currently in use without interruption in service. Similarly, the system can upgrade its operating version of the group communication protocol to improve performance when a member having relatively low capabilities exits the group.

Methods and systems are provided in a group communication system for dynamically changing a version of a group communication protocol from a first version to a second version transparently to external sources and destinations. The system accommodates newly joining members that can only support versions of the protocol other than the version currently in use without interruption in service. Similarly, the system can upgrade its operating version of the group communication protocol to improve performance when a member having relatively low capabilities exits the group.

In a packet communications system stream data is transported over a channel over which packet loss or corruption is possible, with forward error correction (“FEC”) information. A transmitter receives source packets comprising source data, generates FEC source packets formatted to allow for identification of lost or corrupted source packets at a receiver, arranges source data from the source packets into a plurality of source symbols wherein at least one source packet is arranged into more than one source symbol, associates a plurality of source symbols with a source block, generates a plurality of repair symbols from the source block according to a predetermined FEC encoding process and groups the plurality of repair symbols into one or more FEC repair packets associated with the source block. A receiver can use the FEC repair symbols from the FEC repair packets to recover source symbols, as needed.

A packet communication method and a packet communication system capable of making an IPv4-compatible application operating on an information processing apparatus communicate with another information processing apparatus connected to an IPv6 network without using an address translation router. In the information processing apparatus connected to the IPv6 network incorporates, an IPv4-to-IPv6 protocol conversion control function is incorporated in a LAN driver. A protocol conversion control module receives an IPv4 packet from a protocol control module. When a send destination IPv4 address contained in a header of the packet is registered in an address translation table incorporated in the protocol conversion control module, an IPv6 address is generated to be sent onto a LAN. Unless the send destination IPv4 address contained in the packet header is registered in the address translation table incorporated in the protocol conversion control module, the IPv4 packet as received is intactly sent onto the LAN.

In a packet communication system having a node adapted for sending and receiving data packets at a first rate and at a second rate faster than said first rate, the communication system node characterized by sending an acknowledge packet to acknowledge receipt of a data packet, a method for optimizing the acknowledge packet data rate of the node comprising the step of sending acknowledge packets for data packets received at both the first rate and the second rate at the first rate.

In a packet communications system stream data is transported over a channel over which packet loss or corruption is possible, with forward error correction (“FEC”) information. A transmitter receives source packets comprising source data, generates FEC source packets formatted to allow for identification of lost or corrupted source packets at a receiver, arranges source data from the source packets into a plurality of source symbols wherein at least one source packet is arranged into more than one source symbol, associates a plurality of source symbols with a source block, generates a plurality of repair symbols from the source block according to a predetermined FEC encoding process and groups the plurality of repair symbols into one or more FEC repair packets associated with the source block. A receiver can use the FEC repair symbols from the FEC repair packets to recover source symbols, as needed.

A digital subscriber line (DSL) arrangement provides data and voice over IP (VoIP) services over a subscriber loop. Instead of conventional multiplexing at the IP layer, two separate IP packet streams are provided, one stream carrying delay insensitive data traffic and the other transporting delay sensitive traffic, in particular, packetised voice. The system segments each IP stream (i.e. those carrying voice and data) separately to produce two ATM streams which are then multiplexed using an ATM multiplexer. This reduces the delays to voice traffic resulting from queuing behind long data packets.

A method is described for providing voice conferencing between a plurality of users over a communications network, the plurality of users comprising a host user and a plurality of participant users. The method comprises the host user initiating a voice conference using a host user terminal connected to the communications network. The plurality of users join the voice conference. Each of the plurality of users joins the conference by using a client executed at their respective user terminals, wherein on joining the voice conference the user terminal of each of the plurality of participant users displays a participant user interface and the user terminal of the host displays a host user interface. At least one of the plurality of participant users activates a request control on the participant user interface. The client transmits via the communication network a request to the host user to speak in the voice conference in response to the activation of the request control. The host user receives an indication on the host user interface of the request from the at least one of the plurality of participant users, and activates a selection control on the host interface to select from among the at least one of the plurality of users who transmitted the request, the speech of the at least one selected user being transmitted to all of the plurality of users over the communications network.

When the status of a client X is changed to a status i, a group management unit generates a group agent Xi, corresponding to the status i and registers the generated group agent in the server S, and the presence issuing unit issues the status i and the identifier of the group agent Xi. Initially, a member management unit of the group agent xi manages the client X only. When other clients, such as clients B and C, that are observing the status of the client X send an instant message (IM) to the group agent Xi identified by the issued identifier, an IM delivery unit of the group agent Xi adds the clients B and C, which are IM senders, to the members managed by the member management unit and sends the IM to all members.

An apparatus for reporting downlink channel quality in a high-speed packet communication system. A channel analyzer measures downlink channel quality from a received reference channel signal. A controller determines whether a current TTI (Transmission Time Interval) is a TTI corresponding to a multiple of a first TTI or a TTI corresponding to a multiple of a second TTI. If the current TTI is a TTI corresponding to a multiple of the first TTI, the controller determines CQ (Channel Quality) refreshment information for a downlink channel received from the Node B based on the measured downlink channel quality, and if the current TTI is a TTI corresponding to a multiple of the second TTI, the controller determines CQ refinement information for the downlink channel based on the measured downlink channel quality. A CQ information transmitter generates CQ refreshment information or CQ refinement information under the control of the controller, and transmits the generated CQ refreshment information or CQ refinement information over an uplink.

A method for managing a talk burst in a PTT service system comprises: allocating, by a PTT server, master authority to a particular PTT client; and controlling, by the PTT server, another PTT clients according to a talk burst management procedure selected by the PTT client having the master authority. The PTT server allocates the master authority to the PTT client initiating a session and the PTT client having the master authority freely controls the talk burst management procedure, so that session establishment can be smoothly controlled.

In a voice packet communication system, a voice packet loss concealment device compensates for the deterioration of voice quality due to voice packet loss. In the device, a detecting section detects a loss of a voice packet and outputting information; an estimating section estimates the voice characteristics of the lost segment using a pre-loss voice packet received before the lost segment or a post-loss voice packet received after the lost segment; a pitch signal generating section generates a pitch signal having the voice characteristics; and a lost packet generating section outputs the pitch signal generated by the pitch signal generating section, with the voice characteristics estimated by the estimating section, which allows abnormal noise and feeling of mute, subjective deterioration of naturalness and continuity to be improved, and the voice packet loss concealment to be further improved.

An apparatus and method allow for distribution of a streamed signal within a group of users in a computer network, the users accessing client terminals (10, 20, 30, 40) for participation in a multicast session. The apparatus includes connecting links (12, 22, 32, 42) adapted to connect the client terminals of users and related equipment, such as capturing elements (16, 26 . . . ; 18, 28 . . . ), to the multicast session, preferably via the Internet or other interconnecting network. An extension header is added to data packets of the streamed signal, the extension header including identification data relating to the intended recipient of a packet. A filtering element (14, 24, 34, 44) is associated with the receiving client and is adapted to filter out data packets having the address of the recipient and receiving the streamed signal. Consequently, the existing communication channel can be reused.

A packet communication method and a packet communication system capable of making an IPv4-compatible application operating on an information processing apparatus communicate with another information processing apparatus connected to an IPv6 network without using an address translation router. In the information processing apparatus connected to the IPv6 network incorporates, an IPv4-to-IPv6 protocol conversion control function is incorporated in a LAN driver. A protocol conversion control module receives an IPv4 packet from a protocol control module. When a send destination IPv4 address contained in a header of the packet is registered in an address translation table incorporated in the protocol conversion control module, an IPv6 address is generated to be sent onto a LAN. Unless the send destination IPv4 address contained in the packet header is registered in the address translation table incorporated in the protocol conversion control module, the IPv4 packet as received is intactly sent onto the LAN.

Methods and apparatus minimize message latency time by dynamically controlling an amount of message bundling that occurs in a computer network application. Unbundled messages are allowed while a bottleneck resource, such as a network link, is lightly utilized, but the amount of bundling is progressively increased as the message rate increases, thereby progressively increasing resource efficiency.

A group communication system includes a plurality of mobile terminals with member-attribute information, and a center component for collecting location information of the mobile terminals. The center component includes a group generation device for generating a group based on a group-area information and a group-attribute information which are specified, and a group member management device for always monitoring joining and leaving of the mobile terminals with the location information and the member-attribute information which correspond to the group-area information and the group-attribute information of the group, respectively.

A geographic zone base (ZB) radio voice / text chat group communication system where users register to become subscribers of the communication system and join various zone based chat groups to become members of such groups. Any member can broadcast to all listening members of the chat group who, along with the member, are physically located within the geographic zone defined for the chat group. A chat group is created by a subscriber or by the communication system that operates and manages the chat groups. The communication system, in managing the chat groups, is coupled to a communication network (e.g., a cellular communication network) via the Internet and allow users of the cellular communication network to become members and participate in the ZB radio chat groups through the use of their cellular phones to transmit messages to the communication system via the Internet for broadcasting to their respective chat groups.

In a packet transfer method, a packet to be transferred to a destination access network is generated and transmitted to a transmission-source packet transfer apparatus connected to the transmission-source access network. The packet is converted into a superpacket having a length n times (n is an integer of 2 or more) larger than a fixed-length cell as a switching unit of a relay apparatus arranged on a network serving as a backbone, and sent to the network. The superpacket is relayed using the relay apparatus and transferred to a destination packet transfer apparatus connected to the destination access network. The packet generated by the transmission-source access network is reassembled on the basis of the superpacket transferred from the network, and sent to the destination access network. A packet transfer apparatus and packet communication system are also disclosed.

The invention discloses a realizing method of virtual discussion group in the group communication system, which comprises the following steps: the discussion group sponsor builds discussion group requirement, which sends the requirement and member information to server end; the server end affirms outer correlated person, who hopes to join in the discussion group; the group server adds outer correlated person in the discussion group sponsor temporarily; the group server builds virtual discussion group with member information in the group.

A system and method are provided for coding a frame in a packet communications system using a G.709 Digital Wrapper Frame format. The method comprises: accepting digital information; outer encoding the digital information with a Reed Solomon (RS) encoding scheme; interleaving the outer encoded information; inner encoding the interleaved information using a BCH encoding scheme; and, forming a G.709 Digital Wrapper frame including payload and parity bytes. More specifically, a standard DW superframe is formed with 122,368 bits of payload and 8192 bits of parity. The outer encoding process uses an RS(1023,1007) parent code. In one aspect, 15 groups of RS(781,765) and 1 group of RS(778,762) codewords are formed per superframe. The inner encoding process uses a BCH(2047,1959) parent code. In one aspect, 64 groups of BCH(2040,1952) codewords are formed per superframe.

A communications method for a vehicle consist (10) comprising a lead (14) and a remote (12A / 12B / 12C) powered vehicle, the lead (14) vehicle comprising first (29A) and second (29B) antennas each associated with a radio, and the remote vehicle (12A / 12B / 12C) comprising third (29A) and fourth (29B) antennas each associated with a radio. The method comprises transmitting an outbound message from the lead (14) vehicle, receiving the outbound message at the third antenna (29A) and supplying a signal to the associated radio for producing a first received signal, and receiving the outbound message at the fourth antenna (29B) and supplying a signal to the associated radio for producing a second received signal, determining a first and second signal quality metric for the respective first and second received signals, selecting the first or second received signal for processing by the remote vehicle (12A / 12B / 12C) in response to the first and second signal quality metrics.

An apparatus, method, processor(s), and computer program product avoids user data loss by network-controlled, user equipment assisted handover in a wireless data packet communication system. A wireless receiver receives radio link control (RLC) packet data units (PDUs) from user equipment (UE) being served by a source node. A wireless transmitter commands the UE to handover. A network communication interface transmits RLC Uplink (UL) context from the source node to the target node, and transmits RLC Downlink (DL) initialization message and buffered in-transit DL RLC PDUs from the source node to the target node.

A method for processing call conflict in a group communication system and a device based on the method are disclosed in the present invention. In the method of the present invention, judging a first terminal whether or not to call a second terminal when a network receiving a call request signaling of the second terminal calling the first terminal, if it does, then the network establishes the voice access for the first terminal and the second terminal. The device based on the method of the present invention establishes voice access for both conflict parties when the network generates call conflict. The call conflict processing method and device provided by the present invention, ensures the voice access successfully establishing when the call conflict generating, decreases the system call loss rate, promotes the system reliability.

A packet communication system for effectively using network resources and for improving network operability. A transmission security policy database specifies the omission of header information attached when a transmission packet is capsulated, as a transmission security policy. A header-information omitting section omits the header information of the capsulated transmission packet. A packet transmission processing section adds a security header and a header for tunnel communication to the packet from which the header information has been omitted and transmits the packet. A receiving security policy database specifies that the header information has been omitted, as a receiving security policy. A header-information recovering section searches the receiving security policy database for a security policy for a received packet, and when recognizing that the received packet is a target packet from which the header information has been omitted, recovers the header information.

A mobile host 2 as an embodiment of the invention comprises a data link layer connection establishment notification unit 202 for notifying the network layer that a connection to a link layer in the data link has been established during a Dormant state; a router information requesting unit 203 for transmitting, in response to the notification by the data link layer connection establishment notification unit 202, a router request signal which requests for transmission of router advertisement information to the access router 3 existing on the access link 4 to which the mobile host is connected; and a network layer movement detection unit 204 for detecting a default router, based on the router advertisement information returned from the access router 3 in response to the router request signal.

A method and a system for adding a group member, includes: sending a client corresponding to a user to be possibly added to a group a notification message to confirm whether the user agrees to be added to the group; obtaining a confirmation result from the client, and adding to the group the user who agrees to be added to the group. By utilizing the method and the system, unwanted disturbance caused by group management in a group communication system is lessened, meanwhile security of a group communication system is improved, and illegal spread of media which is harmful to individuals and society caused by flaws of a group system may be prevented.

A wireless packet communication system conforming to the IEEE 802.11 standard includes a plurality of access points (APs) most of which have wired connections only for power and an ISDN telephone line. The APs communicate at 8.5 Ghz with a regional point-of-presence that is one end of a VPN through the internet to a national office. The registered users' data and control of the system including the IP assignment and SIP proxy and the control of the 802.11 communication reside in the national office. By retaining for a short period the SIP connection, IP address and key encryption information after a user has disassociated from an AP, the user can quickly reauthenticate and reassociate using the same SIP connection, IP address, and encryption key at a different AP. Voice data and computer data can both be processed through an AP by the addition on another 802.11 frame encoder / decoder.

When selecting size of initial sleep window, the disclosed self-adapting sleep mechanism of comm system based on wireless mobile packets does not take a fixed value, instead select a suitable value based on previous features of window. Mean while, adjusting size of sleep window by self-adaptation, the invention reduces unnecessary conversion from sleep window to listening window of mobile station (MS) effectively so as to raise efficiency for saving power, prolong service time of batteries of MS, and raise use ratio of wireless resource. The method includes procedures: after MS awakens from a time of sleep mode, through a certain time of no service state, and enters into next time of sleep mode, the invention feeds back parameters of previous sleep state and traffic performance parameters to base station. Based on received information, base station calculates size of initial sleep window, and adjusted size of sleep window, and informs them to MS.

Provided is a group communication method in a terminal, including: receiving session information and connection management server information; checking whether there is a connection terminal pre-connected to a session corresponding to the session information on own network; when there is the connection terminal at the check result, accessing to a media server that the pre-connected terminal accesses; when there is no connection terminal at the check result, receiving a media server list by accessing to the connection management server based on the connection management server information; selecting and accessing to a media server in the provided media server list; and performing group communication through the session object on the same session.

The invention discloses a method for establishing discussion group in group communication system, comprising the steps of: adding members in plural groups to list of members to establish discussion group; establishing a discussion group comprising an establisher and members in the list having friend relation with the establisher; adding the members in the list having no friend relation with the establisher to the discussion group according to their groups. And it also discloses a group communication system. And it makes it possible to establish a discussion group in multi-group member mode.