Abstract: A laser control unit, a laser control circuit and a laser-power adjustment method are provided which are capable of controlling laser power precisely, even if an error is produced in the duty of an optical pulse.

Abstract: An information recording medium according to the present invention includes a recording layer that is formed of a single layer of a single type of recording material and is directly sandwiched by a pair of resin layers, the information recording medium being constructed so that at least one resin layer out of the pair of resin layers deforms due to deformation of the recording layer that is caused by irradiation with laser light for recording data and a track pitch is in a range of 0.1 ?m to 0.5 ?m, inclusive, wherein the pair of resin layers are formed with respective Young's moduli in a range of 415 MPa to 7100 MPa, inclusive.

Abstract: The invention provides an optical disk that enables high-speed reproduction of address signals. A wobble address system for optical disk supports various types of synchronization, such as phase synchronization, bit synchronization, word synchronization, etc., to be established easily with high detection reliability with the use of an self-orthogonal code. Thus, the invention provides a method for easily synchronizing an address signal, i.e., high-speed reproduction of the address signal. Further, by virtue of an efficient modulation system of the address signal and redundancy thereof, it becomes possible to detect address information with high reliability. This capability is particularly effective in optical recording/reproduction with a blue light source whose signal light quantity and reproduction quality are prone to reduce.

Abstract: A recording medium includes a substrate having a microscopic pattern, which includes a shape of continuous substance of approximately parallel grooves formed with a convex shaped section and a concave shaped section alternating on a surface of the substrate. A recording layer is formed on the microscopic pattern and a light transmitting layer has a thickness of 0.05 mm to 0.12 mm formed on the recording layer. The microscopic pattern satisfies a relation of P??/NA, wherein P is a pitch of the convex shaped section, ? is a wavelength of a reproducing light beam and NA is a numerical aperture of an objective lens. The microscopic pattern also includes modulated address information formed on both side walls of the convex shaped section viewed from the light transmitting layer as a wobble, both the side walls being parallel to each other, and furthermore wherein the address information is modulated by the phase-shift keying modulation system.

Abstract: An optical recording medium has a user data area and a lead-out area, wherein the user data area and the lead-out area each has grooves and lands formed thereon. Wobbles are formed on at least one lateral surface of grooves of the user data area and the lead-out area, and configured such that wobble characteristics are made different between the user data area and the lead-out area. Different types of wobbles are formed on the grooves of either the user data area or the lead-out area, thereby preventing an optical pickup that performs recording/reproduction from deviating from the user data area. Also, in a multi-layer optical recording medium, a whole area of a recording layer is configured to have a same condition, thereby preventing deterioration in reproduction and/or recording due to a difference in light power transmittance of another recording layer.

Abstract: A high-density optical recording medium and method of recording data on the optical recording medium. The optical recording medium includes a plurality of data recording/reproducing surfaces having reflectances for light passing through a pit area, a land/groove area, and a land/groove area on which data are recorded, of a data recording/reproducing surface included between a light source for emitting light and a recording/reproducing surface selected from the plurality of data recording/reproducing surfaces, the reflectances satisfy the expressions r1?r2?r3 and {(r1?r3)/r1}?0.2, where r1, r2 and r3 are the reflectances of the pit area, the land/groove area and the land groove area on which data are recorded, respectively.

Abstract: A system for a backplane that employs i) an adjustment of positive-to-negative (P-N) driver skew of a transmit signal of a relatively high-speed differential driver to reduce far-end crosstalk, ii) a high-speed differential subtraction circuit combining a gain-adjusted replica of at least one transmit signal with a received signal to reduce near-end crosstalk, and iii) a phase-locked loop (PLL) synchronization circuit to align timing events between a set of near-end and far-end high-speed interfaces.

Abstract: Provided are delta-predicted frequency offset compensation apparatus and method that estimates an offset delta of forthcoming symbols by using a principle that the offset delta of a symbol in a previous section is almost the same as an offset delta of some forthcoming symbols. The offset compensation method of the present research includes the steps of: a) estimating a frequency offset of a communication system based on an estimation period and estimation algorithm; b) outputting a compensation value for offset compensation through a feedback loop by considering the frequency offset value estimated based on the estimation period and the frequency offset delta estimated based on the estimation period and delay interval; and c) shifting the phase of a signal by as much as the offset corresponding to an input signal of the communication system to compensate the symbol for the frequency offset.

Abstract: A method and OFDM receiver are provided for reducing the influence of harmonic interference on OFDM transmission systems, wherein high interference unity is achieved by the simultaneous use of a window function and a determined item of reliability information, the window function being a Nyquist-shaped window function which generates low side lobes in the subcarrier and interference spectra while simultaneously leaving the orthogonality of the subcarriers unchanged, the determined item of reliability information being derived from a measurement when transmitting a so-called zero symbol, in order to detect the instantaneously active interference signals, with the high interference immunity being achieved when the subcarrier-specific information is taken into account in a so-called Viterbi decoder.

Abstract: The present invention provides an apparatus and method of multiple antenna receiver combining of high data rate wideband packetized wireless communication signals, where the apparatus includes M receive antennas, receiving M high data rate wideband packetized wireless communication signals, where each of the signals includes N frequency bins. The apparatus, in an exemplary embodiment, includes (1) a joint timing recovery units that perform joint coarse signal timing estimation, joint frequency offset estimation, and joint fine timing estimation on each of the signals, (2) M Fast Fourier Transform units (FFTs) that each convert the digital data for each of the M signals into frequency domain information for each of the N received frequencies and that output Q pilots for each of the signals, where Q is a positive integer, and (3) a combiner that weights and combines the outputs of the M FFTs for each of the N received frequencies.

Abstract: A method for generating a preamble sequence in an orthogonal frequency division multiplexing (OFDM) communication system having A subcarriers in a frequency domain. The method comprises generating a length-2×M×N preamble sequence, where 2×M×N is less than A, by using a length-N Golay complementary sequence and a length-M Golay complementary sequence; and assigning elements constituting the preamble sequence to 2×M×N subcarriers among the A subcarriers on a one-to-one mapping basis, assigning null data to the remaining subcarriers excluding the 2×M×N subcarriers from the A subcarriers, and then IFFT-transforming the assigned result into time-domain data.

Abstract: The object of the invention is to introduce an advanced method and arrangement for changing parallel data transmission connections in an assured data transmission link. According to the method of the invention, the transmission path to be received is changed, prior to the passage of errors, and the data transmission of the link remains free of errors, in case even one of the transmission paths transmits the data as error-free, even if errors occur in other paths. The error-free quality of the link is maintained also when error-free and erroneous data transmission paths are suddenly exchanged.

Abstract: A multiprocessor switching device substantially implemented on a single CMOS integrated circuit is described in connection with a parallel routing scheme for calculating routing information for incoming packets. Using the programmable hash and route routing scheme, a hash and route circuit can be programmed for a variety of applications, such as routing, flow-splitting or load balancing.

Abstract: One illustrative method of reducing undeliverable server-initiated IP traffic within a wireless network (21) includes the steps of identifying that a data connection (e.g. a Packet Data Protocol or PDP Context) for communicating server-initiated IP messages from a host server (22 or 26) to a mobile station (10) has been lost or terminated; causing a notification message having a destination address corresponding to the host server (22 or 26) to be produced based on identifying that the data connection has been lost or terminated; and causing the notification message to be sent to the host server (22 or 26). The notification message may cause the host server (22 or 26) to at least temporarily refrain from communicating and/or to queue server-initiated IP messages (10) intended for the mobile station (10). The notification message may be formatted and communicated based on an existing protocol, such as Internet Control Message Protocol (ICMP), or any other suitable protocol.

Abstract: A wireless communication system and method employing channel transport format allocation in a shared uplink channel between a UE and a Node B, and wherein the UE can determine a transport format combination which it can support, by: detecting in the UE a change in transport format combination that the UE can support; and sending to the Node B an indication of transport format combination that the UE can support, whereby efficiency of channel transport format allocation in the system may be improved. A conditional delay mechanism may be employed to reduce signalling overhead. This allows uplink shared channels to be efficiently used by providing a means by which UTRAN (UMTS terrestrial radio access network) is informed of the TFCs within the TFCS which can be used in the uplink by the UE.

Abstract: The invention concerns a method for admission control of connections made up of one or several flows to a shared wireless medium. It applies criteria for each new connection to determine whether resources can be provided for this connection. The criteria include the steps of: calculating a number (R) of retransmissions of frames which are needed, depending on: a target application PDU error rate (?i); a data link layer mean error rate (BER); and a maximum size (L) of the transmitted frames; calculating the achievable quality of service parameters (T?i) based on the calculated number (R) of retransmissions with the target application PDU error rate (?i), and determining if resources can be provided for the connection depending on the achievable quality of service parameter (T?i).

Abstract: A system, apparatus, and method for determining network capacity and managing network congestion in response to a change in an end-to-end communication path between sender and receiver hosts. A receiver mobility notification is provided by the receiver host to the sender host. The sender host determines whether the receiver host has moved between networks or sub-networks using the receiver mobility notification. If the sender host determines that the receiver host has moved from one network/subnet to another network/subnet, a congestion state at the sender host is reset to correspond to the new end-to-end communication path established between the sender host and the receiver host in the new subnet.

Abstract: The present invention extends to methods, systems, and computer program products for increasing the accuracy and efficiency of admission control for data streams. A transmitting computer system transfers a companion data stream along with a variable rate data stream to simulate the maximum data transfer of the variable rate data stream. Accordingly, active probing experiments conducted at other computer systems receive a more accurate indication of the available bandwidth (or bandwidth that may be available in the future). Computer systems can maintain admission control caches that indicate the results of previously conducted active probing experiments and the network configuration when previous data streams where admitted to a network. Computer systems can refer to an admission control cache when performing admission control to increase the efficiency of admission control. That is, an admission control decision can be made without having to conduct a complete active probing experiment.

Abstract: A method is described that resets a first count and resets a second count if a first transmission unit is recognized as being within a new measurement time window. The first transmission unit has a size. The method also increments the first count by the first transmission unit size and by the size of each subsequent transmission unit that is received within the new measurement time window after the first transmission unit—so long as the first count does not exceed a maximum allowable value for the first count. The method also checks if a maximum value for the second count is exceeded if it is incremented by a second transmission unit size. The second transmission unit is received within the measurement time window. The check is in response to a determination that the first count would have exceeded the first count maximum allowable valuable if the first count were incremented by the second transmission unit size.

Abstract: A method is disclosed for synchronizing a data communications network. The data communications network comprises a plurality of existing nodes forming one or more synchronization domains and a node entering the network. Each existing node in a synchronization domain stores a common representation of the synchronization domain and is configured to flood the synchronization domain with domain representation information. In a synchronization domain identification step formed at the entering node, the entering node exchanges entering node domain representation information with a first neighboring existing node. The entering node identifies as a first synchronization domain common with the first neighboring existing node all neighboring existing nodes from which the entering node domain representation information is flooded back the entering node.

Abstract: A multipath processing architecture that allows multipath packets to be distributed across multiple paths using a hash function and a modulo-arithmetic-based mapping function is disclosed. In one embodiment, the multipath processing architecture is implemented as part of a packet classification engine of a network node.

Abstract: Methods, apparatuses and systems directed to a network traffic synchronization mechanism facilitating the deployment of network devices in redundant network topologies. In certain embodiments, when a first network device directly receives network traffic, it copies the network traffic and transmits it to at least one partner network device. The partner network device processes the copied network traffic, just as if it had received it directly, but, in one embodiment, discards the traffic before forwarding it on to its destination. In one embodiment, the partner network devices are operative to exchange directly received network traffic. As a result, the present invention provides enhanced reliability and seamless failover. Each unit, for example, is ready at any time to take over for the other unit should a failure occur.

Abstract: A fault isolation system and method. A hierarchical numbering system is applied to devices within a cable network. Each subscriber is associated with a “last active device” or “LAD” providing service to that subscriber. The numbering system provides “genealogical” information about the subscriber's LAD so that the LAD can be located within the network. By correlating trouble reports from subscribers, a fault in an active device can be isolated to a particular segment of a cascade if not a particular active device. The number system comprises a continuously concatenated string that provides a relative location of each active device with a cable network.

Abstract: A communication protocol that provides load balancing and/or test pattern information between devices is described. A first embodiment of the protocol provides such information via a data frame that is transmitted a definitive time after a special DTIM beacon is transmitted. This protocol provides full compliance with IEEE 802.11. The second embodiment of the protocol modifies the 802.11 beacon data structure with additional information elements.

Abstract: A method of monitoring a network that includes a number of nodes interconnected by trunks has a step of obtaining processor usage data pertaining to a plurality of node processors, the processor usage data including information representative of a rate of usage of each of the plurality of node processors. The method also includes obtaining memory usage data pertaining to a plurality of memories, each of the plurality of memories associated with a node processor, the memory usage data including information representative of a rate of usage of each of the plurality of memories. The method further includes determining from the memory usage data and the processor usage data whether a network congestion event is occurring.

Abstract: A bi-directional packet data transmission system for a packet data transmission between a terminal and a radio access network includes an uplink resource and a downlink resource which are independently set. Memory resources can be effectively managed even in a packet data transmission service with the asymmetrical structure such that the packet amount for the downlink is much greater than the packet amount for the uplink, or the packet amount for the uplink is much greater than the packet amount for the downlink.

Abstract: A radio communication terminal, being used in a radio communication systems in which the transmission rate varies depending on radio wave conditions and communication statuses of other users, comprises a reception module which receives packets transmitted by a base station in an idle state of the radio communication terminal, a signal processing module which estimates a transmission rate available in communication based on the packets received by the reception module, and a display module which displays information indicating the transmission rate estimated by the signal processing module.

Abstract: Portable electronic devices including a transmitter configured to request a packet data session are provided. An attaching circuit configured to collect information about the requested packet data session and determine default parameters of the portable electronic device associated with attaching the portable electronic device to the network based on the collected information are also provided. Related methods of operating portable electronic devices are also discussed.

Abstract: The present invention provides a method for optimization of the configuration of a hierarchical network having a first hierarchy level (LEVEL(j?1)), a second hierarchy level (LEVEL(j)) next below the first level, and a third hierarchy level (LEVEL(j+1)) next below the second level, each level comprising nodes (RNC's, HUB's, RBS's) each of which, in level other than the lowest, receives traffic from a cluster of nodes (HUB's, RBS's) of the level next below. The method comprises first determining an initial arrangement of nods (RNC's, HUB's, RBS's) in each of the levels other than the highest, allocating respective initial clusters of nodes (HUB's, RBS's) of that level to the nodes (RNC's, HUB's) of the next higher level, and performing optimizing iterations until they result in no changes in number, disposition and allocation of nodes (RNC's, HUB's, RBS's) over predetermined number of iterations.

Abstract: A method of creating virtual private networks within a packet network having a mesh topology. A flexible virtual private network is established based upon a topology calculated at each member node. The network is set up using label switched paths between adjacent member nodes according to the topology. The topology may be a ring or a tree. A virtual ring is created as a closed-loop sequence of label switched paths established between a set of member nodes. The closed-loop sequence of label switched paths is established by the member nodes as each member node connects to its neighbours on the virtual ring. The virtual ring may expand by adding member nodes and may contract by removing member nodes. A member node's position on the virtual ring may be established using a sortable value.

Abstract: The present invention is directed to a secondary communication server 216 for assuming control of a communication formerly controlled by a primary communication server 212 in the event of a failure, comprising: (a) an input operable to (i) receive, from a first communication node 204a, first communication information, wherein the first communication information is associated with the communication and comprises a first node identifier 236a and/or a communication identifier 240a, the first node identifier 236a is associated with a second communication node 204b, the communication identifier is associated with the communication, and the second communication node 204b comprises second communication information associated with the communication and (ii) thereafter receive, from the second communication node 204b, the second communication information; and (b) a reconstruction agent 228 operable to identify the second communication information based on the first node identifier 236a and/or communication identifi

Abstract: Mobile routers in a tree-based network topology with a single clusterhead in an ad hoc network establish connectivity based on each attached mobile router sending a neighbor advertisement message to an attachment mobile router via a corresponding egress interface. Any neighbor advertisement message received by a mobile router is used to identify specified network prefixes that are reachable via the source of the neighbor advertisement message. Each attached mobile router outputs to its attachment router another neighbor advertisement message that specifies the network prefix used by the mobile router, and the specified network prefixes from its attached mobile routers. The mobile router also identifies peer mobile routers having the same depth, and selectively shares limited routing information with the peer routers, enabling the mobile router to bypass the clusterhead and reach remote prefixes via the peer routers without burdening the tree.

Abstract: In the communication network system, when transferring communication data from a transmission source node to a destination node by using a first path, at the time of selecting a route to the destination node by the transmission source node, a data base covering all the links of different attributes is set up to generate information of a route whose metric (cost) is the minimum and in which information a link attribute is described by using the data base.

Abstract: A topology discovery process is used to discover all of the links in an ad hoc network and thereby ascertain the topology of the entire network. One of the nodes of the network, referred to as the coordinator, receives the topology information which can then be used to, for example, distribute a routing table to each other node of the network. The process has a Diffusion phase in which a k-resilient mesh, k>1, is created by propagating a topology request message through the network. Through this process, the nodes obtain information from which they are able to discern their local neighbor information. In a subsequent, Gathering phase, the local neighbor information is reported upstream from a node to its parents in the mesh and thence to the parents' parents and so forth back to the coordinator. The robustness of the Diffusion phase is enhanced by allowing a node to have more than one parent as well as by a number of techniques, including use of a so-called diffusion acknowledgement message.

Abstract: A method for providing a QoS-guaranteeing multi-path and a method for providing disjoint paths using the same are provided. The method configures the shortest path tree by adapting the start node “s” and the destination node “d”. When a new node is selected as a tree node in a tree configuration process according to the “s” or the “d”, the closest node to either the “s” or the “d” is selected. If a specified node “v” is contained in both a tree oriented from the “s” and another tree oriented from the “d”, one path of “s”-“v”-“d” is created. If all nodes are contained in either the tree of “s” or the other tree of “d”, then a program of path creation process is terminated. Further, the method further includes a step for determining two disjoint paths from the “s” to the “d” among the found multiple paths above.

Abstract: The present invention is related to a transmission system for sending digital data on a digital bus (1), to which are connected a number of master and slave modules. The system is characterized by the fact that a number of modules may comprise two connectors (20, 21) to said bus, and a switch (22) or switches (52, 53), allowing the interruption of said bus. This design allows an address setting procedure to take place, before starting normal operation. During this initialization, the addresses of the modules are set by consecutively closing the switches, and setting the address. Every time a switch is closed in one module, the following module can receive its address. The invention is related to several embodiments of the system allowing this procedure, and to the method of initializing such a system.

Abstract: One embodiment of the present invention includes a telephony interface, a network interface and a local area network (LAN). The telephony interface provides connectivity between one or more netphones and an external telephone network such as a PSTN telephone system. The network interface provides connectivity between one or more computers and an external computer network such as the Internet. The local area network provides interconnectivity between the netphone(s), the computer(s), the telephony interface and the network interface. In some embodiments, there may be two or more netphones which can communicate with each other internally via the LAN, in addition to communicating with the external telephone network. Similarly, there may be two or more computers that can also communicate with each other internally via the same LAN, in addition to the external computer network.

Abstract: A method and apparatus for sharing a DL-DPCH in an NB-TDD system. Two time slots at the same position in two subframes forming one radio frame are allocated as a DPCH for two UEs. A Node B arranges data and control information for the UEs in the two time slots and transmits the data and control information to the UEs. The UEs extract the data and control information from the two time slots and acquire the data and control information destined for the individual UEs.

Abstract: The present invention relates to a cancellation of echoes in telecommunications systems, more specifically it relates to adaptive alignment of a linear filter (500) used for echo cancellation. According to the invention, it is continuously determined, by means of control logic (520), if a reflection replica delay included in an echo replica signal (110), which delay is provided by a signal buffer (510), should be attempted to be increased or not. Similarly, it is continuously determined if the reflection replica delay should be attempted to be decreased or not. In this way it is possible to provide a delay of the reflection replica which corresponds to the pure delay of a corresponding reflection included in an echo signal (120) received over an echo path. The invention is advantageous since the filter (500) will continuously and quickly adapt to changes in the echo path delay by continuously increasing or decreasing, in an incremental and smooth manner, a present replica delay.

Abstract: Disclosed is a data communication system transmitting data using adaptive modulation at an acknowledged data transfer mode simultaneously. The present invention includes a first step of monitoring variation of radio environments by a receiving end receiving packets sequentially, a second step of determining a coding type to be varied in accordance with the variation of the radio environments in the receiving end so as to inform a transmitting end of the determined coding type, and a third step of forwarding sequentially the corresponding packets with a transfer rate in accordance with the determined coding type in the transmitting end.

Abstract: Redundant wireless links in a meshed backhaul network may be used to improve quality of service on the backhaul network by confining knowledge of the duality to the attached network elements. Globally, an aggregate bandwidth of the redundant wireless links may be advertised to allow network level routing to treat the redundant links as a single logical link. At the link level, however, the network elements may differentiate between different types of traffic to provide preferential service to particular types of traffic. By using different physical links within the logical link for particular types of traffic, the quality of service for that type of traffic may be improved by not causing different types of traffic to compete for the same bandwidth. The redundant links may be interfaced using a tower network including a radio accessed router optionally powered using solar power, to isolate the tower network from ground equipment.

Abstract: A method and system for compressing an asynchronous transfer mode (ATM) header suitable for wireless ATM systems is provided. The ATM Virtual Path Identifier (VPI) and Virtual Channel Identifier (VCI) are replaced with four and eight bit pointers, respectively. In addition, Generic Flow Control (GFC) and Header Error Control (HEC) fields are removed.

Abstract: Disclosed is a process for processing an MAC-hs PDU (Protocol Data Unit) in an HSDPA (High Speed Downlink Packet Access) communication system, transmitting at least one PDU (Protocol Data Unit) received over a physical (PHY) layer to an MAC (Media Access Control) layer in an HSDPA (High Speed Downlink Packet Access) communication system, includes an HS-DSCH (High Speed-Downlink Shared Channel) decoder for decoding the PDU at intervals of a first period during which the PDU is received from the PHY layer, and storing the decoded PDU in a first memory; a second memory for storing a control table containing position and number information of the PDU, and performing a reordering queue operation on the basis of the position and number information of the PDU; an HSDPA (High Speed Downlink Packet Access) controller for reading the PDU from the first memory, storing the read PDU in the second memory, monitoring the second memory during a second period which is longer than the first period, updating the number of PDUs

Abstract: A device and method to allocate a secondary power supply to a Fiber-to-the-Home subscriber is disclosed. The present invention employs methods to selectively accept or rejects packets in order to conserve power of the secondary power supply while allowing critical packets to reach their destinations.

Abstract: An apparatus and method for receiving an MBMS (Multimedia Multicast/Broadcast Service) notification indicator allows discontinuous reception of an MBMS notification indicator in a mobile communication system. A mobile terminal receives and stores a terminal-specific DRX (Discontinuous Reception) cycle length and the longest DRX cycle length broadcasted in a cell. The mobile terminal discontinuously receives a notification indicator for a specific MBMS during a terminal-specific DRX cycle length of the longest DRX cycle length by using the stored terminal-specific DRX cycle length and the longest DRX cycle length used in a cell.

Abstract: A satellite network [100] includes backbone satellites [110]. The backbone satellites [110] act as routers for data units transmitted through network [100]. The backbone satellites [110] communicate with one another through inter-satellite links [111]. The satellite network [100] may further include user satellites [120] and ground stations [140]. The user satellites [120] may communicate with the backbone satellites [110] through omni-directional links [112].

Abstract: Apparatus and a method employable in a wireless communication network for managing, among plural communication stations in a group of such stations, bandwidth-sharing of available, unused bandwidth. Implementation and practice of the invention involve (a) establishing a pattern of periodic beacon transmissions having a defined first time spacing between time-next-adjacent transmissions, which transmissions are designed, nominally, to convey bandwidth-availability (transmission-budget) announcements to stations in the group, (b) from within this pattern, choosing a sub-pattern of selected, periodic beacon transmissions having a defined second time spacing between time-next-adjacent, chosen sub-pattern transmissions, which second time spacing encompasses a predetermined number of the beacon transmissions having the mentioned first time spacing, and then (c) utilizing only the selected beacon transmissions in this sub-pattern to convey the announcements of any new (changed) transmission-budget information.

Abstract: A method for monitoring a connection to a user terminal in a telecommunications system and a telecommunications system comprising an element (CSCF) controlling a connection to a user terminal (UE) and a system part (SGSN, GGSN) providing transport of user data, which system part is separate from said controlling element, wherein a system element which knows the state of the connection to the user terminal (UE) is arranged to send an indication message to the controlling element (CSCF) indicating the state of the connection, and the controlling element (CSCF) is arranged to decide the state of the connection to the user terminal (UE) based on the indication message received.

Abstract: A system and method for avoiding mutual interference between two communications system is disclosed. One embodiment of the invention provides a system that includes a fixed unit and a portable unit. The fixed unit has a fixed transceiver. The portable unit has a portable transceiver. The fixed transceiver and the portable transceiver are members of a first RF system of the first RF system. The portable transceiver is configured to communicate with the fixed transceiver via a first RF link of the first RF system. The system further includes an additional transceiver. The additional transceiver is configured to communicate with a headset via a second RF link of a second RF system. The system further includes a processor that is coupled to one of the fixed transceiver, the portable transceiver, and the additional transceiver. The processor is configured to avoid interference between the first RF link and the second RF link.

Abstract: A communication node for enabling interworking of a first network in which data transfer is based on a combination of request and response and a second network in which data transfer is not based on a combination of request and response is disclosed. In the communication node, a packet conversion processing is applied to a first packet received by the first interface on the first network side so as to obtain a second packet corresponding to the second network at a time of executing an application across the first network and the second network, and a correspondence between the first packet and the second packet is stored in a packet correspondence memory. Then, a destination node on the first network to which a response packet is to be transferred is identified by referring to the packet correspondence memory using an information of the response packet at a time of receiving the response packet corresponding to the second packet by the second interface on the second network.