Abstract: An apparatus and a method for performing a protocol that optimizes a transmission power in a network. The apparatus and the method perform a protocol that optimizes the transmission power in the network for point-to-multipoint communication (1:N). The apparatus includes a communication unit for sending and receiving a data packet through the air, and a control unit that outputs a control signal for controlling the transmission power according to connection information of the data packet received through the communication unit. The connection information includes a reception signal strength and/or link quality information. Since the transmission power is adjustable, communication is carried out among nodes of the network with an adequately minimum power consumption and a proper communication quality.

Abstract: A communication method and a communication arrangement in a Code Division Multiple Access radio system is provided According to one embodiment, at least two transceivers of the radio system communicate with a packet switched connection through a radio interface. The quality of the packet switched connection is measured and a target Signal Interference Ratio is adjusted based on the quality measurement. When a transceiver receiving packets transmits a request to retransmit in the case of failure in reception of at least one packet, a transceiver transmitting packets is configured to retransmit each packet requested as a response to the request. The target Signal Interference Ratio for retransmission of a packet is set lower than the target Signal Interference Ratio for the first transmission of the corresponding packet.

Abstract: An enhanced spread-spectrum uplink technique provides more efficient packet transfer in a wireless network. A mobile station requests to utilize an uplink channel, typically, a physical dedicated channel. If the network will grant access, a base station sends back a channel-request-granted message, which specifies a transmission start time and length. The base station starts related downlink transmissions at the start time, and at a time thereafter, the mobile station starts sending packet data over the uplink physical dedicated channel. After a transmission of no more that the specified length, the mobile station ceases its uplink transmission on the dedicated channel, and the base station and/or the mobile station can immediately release one or more channel resources. The grant message and/or the subsequent signaling communications from the base station may also specify a modulation scheme and a channelization code for the uplink channel.

Abstract: A wireless receiver for receiving signals from an interference-limited transmitter in an interference-limited system comprising at least one transmit antenna, wherein the signals comprise a plurality of symbols. The receiver comprises a plurality of receive antennas and collection circuitry for collecting a plurality of signal samples with at least one symbol and interference effects. The receiver also comprises suppression circuitry, accumulation circuitry, circuitry for providing estimates of a group of bits, error detection circuitry and circuitry for requesting the transmitter to transmit a retransmission of a packet in response to detecting an error.

Abstract: In a wireless USB data transfers over UWB, software configures hardware thresholds to control data transfer in a manner that uses bandwidth for good connections over bad connections, given the high error rate experienced with wireless USB. Periodic transfers are first attempted before asynchronous transfers, as long as the periodic transfers are successful. When failures are occurring, the hardware includes a mechanism having a software-configurable threshold specifying the number of errors a given endpoint can tolerate before it is paused in the schedule. By pausing transfer attempts that are likely to again fail, endpoints with successful transfers are favored over those experiencing errors. When the number of active transfers pending exceeds a software-configurable notification threshold for isochronous endpoints, the hardware notifies the software of this state, corresponding to a low-buffer condition at the receiver.

Abstract: To address the need to support multiple packet data service instances in a more efficient manner, various signaling enhancements are provided. These enhancements will result in faster packet data call setups, reactivations, and dormant handoffs of multiple service instances while reducing over-the-air signalling. For originations of multiple packet data service connections, the mobile (101) requests the setup of up to six service instances with a single origination message (e.g., 400). For packet data dormant handoffs, the mobile requests the handoff of up to six service instances using a single message. And for reactivations, the mobile requests the reconnection of multiple, dormant packet data service instances with a single message.

Abstract: The apparatus, method and system embodiments of the present invention provide for maintaining call control at a gateway mobile switching center (MSC), for roaming mobile units, utilizing a packet network or link, such as an ATM link. The preferred system embodiment includes a gateway MSC, a serving MSC, and a base station having a wireless link with the roaming mobile unit. The gateway MSC includes a protocol handler for voice (PHV).

Abstract: The present invention supports a message protocol on a wireless communication network between the access gateway and the proxy session initiation server. Upon disruption of a communication session with a mobile station, an information packet indication disruption of the communication session is transmitted from the access gateway to the proxy session initiation protocol server. Upon receipt of the information packet, the proxy session initiation server initiates a resource release procedure freeing network resources supporting the communication session. The proxy session initiation server releases the resources and transmits an information packet to the serving session initiation server, which also initiates a release procedure. Answer and acknowledgement messages are also sent in response to the release request and/or the release of resources.

Abstract: A mobile communication device (200) has a software architecture (302) that includes a closed operating environment (306). The closed operating environment is inaccessible to the user of the mobile communication device, and it includes software for implementing a reporting function designed to collect certain information from within the mobile communication device, and to transmit it to an entity outside the mobile communication device, such as a server (310).

Abstract: An apparatus and methods for enhanced data communications and control between a vehicle and a remote data communications terminal are disclosed. The apparatus preferably includes a first protocol converter adapted to be positioned in communication with at least one electronic subsystem of the vehicle, a first transceiver, a first requestor, and a first buffer. The apparatus also preferably includes a second transceiver, a second protocol converter, a second requestor, and a second buffer. The first protocol converter converts data of a vehicle communication protocol to data of an over-the-air communication protocol. After the first requestor opens a window in an over-the-air communication channel between the vehicle and the remote data communications terminal, the first transceiver in the vehicle wirelessly transmits data over-the-air from the vehicle to the second transceiver in the remote data communications terminal preferably not using the over the air communication protocol.

Abstract: The method for roaming in a network environment utilizes a token created by a first bridge device. The token comprises an identity of a context associated with the mobile device. The first bridge device creates the token and securely provides it to the mobile device. When the mobile device roams to a second bridge device in the network, the token is securely provided to the second bridge device. The second bridge device uses the token to establish to the first bridge device that it is a genuine agent of the mobile device. Once the first bridge authenticates the second bridge device's authority, it securely sends the context associated with the mobile device to the second bridge device. The second bridge device uses the context to properly connect the mobile device to the network. In this manner, secure roaming within a bridged network is provided.

Abstract: A system and method is disclosed for providing concurrent data transmissions in a wireless communication network. The invention comprises a register unit within a base transceiver station that prepares data packets to be transmitted to mobile stations within a plurality of cell sectors. The register unit identifies the cell sector destination of each data packet in a first data call and sends the data packet to a buffer associated with the cell sector destination. The buffers store their respective data packets for each cell sector in a first subframe of a data frame. The buffers send their respective data packets within the first subframe to their respective antennas. The data packets for each cell sector are then concurrently transmitted during the first subframe. Data packets of a second data call are transmitted during the second and third subframe so that two data calls are concurrently transmitted.

Abstract: Methods and apparatus are presented to reduce the number of registration requests transmitted by a mobile node to a foreign agent. Rather than always sending the re-registration request at pre-determined times before the expiry of registration lifetime, re-registration requests are transmitted only if some data transfer takes place after a time period demarcated by the previous successful registration.

Abstract: A communications network comprises a central controller which operates to control a zone of the network and which provides a conference call facility with at least one gateway engaged in a call with a mobile station via a first communication channel, means for generating a hand-off required indication indicating that handover of the call is needed, means at the central controller for receiving said hand-off required indication and opening a conference call channel as a second communication channel for the call and means for handing over said call from the first to the second communication channels and, if the handover is successful, causing the first communication channel to be closed.

Abstract: A method and apparatus for baseband transmission between a top floor unit and an outdoor unit in a terminal for a wireless metropolitan area network. A terminal for a wireless link in a metropolitan area network includes an extender device (e.g. a top floor unit) for receiving data packets from a computer network coupled to the extender device and for forwarding the data packets, and a broadcast device (e.g. an outdoor unit) coupled to the extender device for receiving the data packets from the extender device according to baseband transmission and having a wireless transceiver for communicating the data packets over the wireless link. The terminal can include a cable coupled between the extender device and the broadcast device wherein the cable comprises a twisted pair of conductors for providing the data packets from the extender device to the broadcast device. The twisted pair of conductors can be a Category 5 twisted pair of conductors.

Abstract: A portable electronic device is disclosed that is reprogrammable through a pager network. The device includes a communications port. The device also includes a data transceiver for transmitting send data and receiving receive data from a pager network. In addition, the device has a processor. The processor is in electronic communication with the communications port for communicating through the communications port. The processor is also in electronic communication with the data transceiver for communications with the pager network. The device also includes reprogrammable memory programmed with instructions to cause the device to receive new program code from the pager network and to reprogram the reprogrammable memory with the new program code.

Abstract: An apparatus and methods for enhanced data communications and control between a vehicle and a remote data communications terminal are disclosed. The apparatus preferably includes a first protocol converter adapted to be positioned in communication with at least one electronic subsystem of the vehicle, a first transceiver, a first requestor, and a first buffer. The apparatus also preferably includes a second transceiver, a second protocol converter, a second requestor, and a second buffer. The first protocol converter converts data of a vehicle communication protocol to data of an over-the-air communication protocol. After the first requestor opens a window in an over-the-air communication channel between the vehicle and the remote data communications terminal, the first transceiver in the vehicle wirelessly transmits data over-the-air from the vehicle to the second transceiver in the remote data communications terminal preferably not using the over the air communication protocol.

Abstract: In a router or packet processing node supporting Mobile IP, a method for causing packets to be retransmitted from a sender to a mobile node is disclosed. A plurality of packets having associated update information are received. The packets are intended for the mobile node. The update information associated with at least one of the received packets is stored. When the mobile node is disconnected from the sender and reconnects to the sender, without waiting for a timeout the sender is directed to retransmit a last portion of packets to the mobile node based on the stored update information. Apparatus and computer readable medium embodiments are also disclosed.

Abstract: A method for synchronizing data between a mobile terminal and a computer is provided, in which schedule data can be synchronized between the mobile terminal and the computer using a radio network and Internet network. In this method, either a mobile terminal or a computer corresponding to a party requesting data to synchronize transmits its head data to another party for synchronizing data through an Over-The-Air Function (OTAF) system. The party synchronizing data compares the transmitted head data with its head data, and transmits its newest data and corresponding head data in accordance with the comparison result. The requesting party stores the newest data, and transmits its newest data to the parry for synchronizing data through the OTAF system. Then, the party for synchronizing data stores the newest data of the party for requesting data to synchronize in its memory area.

Abstract: A cellular wireless internet access system which operates in the 2.5 to 2.68 GHz band and which must comply with complex government regulations on power levels, subscriber equipment and interference levels yet which provides high data rates to users and cell sizes of 1½ miles radius or more from base stations with subscriber equipment and antennas mounted indoors. Such base stations are mounted low and use spread-spectrum transmission to comply with interference rules with respect to adjacent license areas. An unidirectional tear-drop coverage pattern is used at multiple cells to further reduce interference when required. Time division duplex is used to allow the system to operate on any single channel of varying bandwidth within the 2.5 to 2.68 GHz band. Backhaul transmission from base stations to the Internet is provided using base station radio equipment, operating either on a different frequency in the band or on the same frequency using a time-division peer-to-peer technique.

Abstract: Simplified data message terminals and data communicating voice terminals are described for providing additional functionality in a facility using a wireless data communication system. The simplified data message terminals provide message and paging communication to employees or customers in a simplified terminal configuration using the existing data communication system. By performing voice to data and data to voice conversions, the same system provides voice communication without interruption of data communication services.

Abstract: A system and method in a wireless network for discovering which resources (e.g., other wireless computing devices) are proximate a user's wireless computing device. Wireless signal strengths with respect to various base stations are compared with the signal strengths of other network devices or resources, to determine which devices are experiencing similar signal strengths. Devices with similar signal strengths are deemed proximate. Each participating computing device may send its signal strength reports to a proximity server, which distributes proximity data to network clients. Each client may receive and process the signal strength data for determining which other clients/resources are proximate, or the server can perform proximity computations and return a list of proximate clients. Once computed, the identities of the proximate clients can be used to query for additional data about the clients, such as the names and other details of their owners, or information about the resource.

Abstract: In packet communications that employ header compression/decompression, the computational complexity of checksum generation can be reduced by re-using static checksum information associated with header bits that do not change from header to header. The static checksum information can be used together with information about header bits that do change from header to header, in order to generate a desired checksum. The checksum can then be used to verify a reconstructed header produced from a compressed header by a header decompressor.

Abstract: This invention refers to a bandwidth optimizer, dynamically operating in connections relating to radio-communications for multi-bearer systems, especially useful for DECT systems for the short-distance transfer of data packets. Such an optimizer comprises: a first block to which bit error rate (BER) is fed and which calculates the most likely number (k) of retransmissions, which is required by the quality of air interface; a second block, which receives from the first one the most likely number (k) of retransmissions and provides, on the basis of such a number, a table giving the change in transmission time with the number of bearers; and a third block, which is fed by the second one and decides the optimal number of bearers to be allocated to the connection and the output of which feeds a device for resources allocation (RA), the optimal number of bearers representing the maximum band to allocate to the connection, depending also on the traffic intensity.

Abstract: Apparatus for mobile communication includes a switch and a plurality of access points, which are arranged in a wireless local area network (WLAN) to communicate over the air on a common frequency channel with a mobile station using a common basic service set identification (BSSID) for all the access points. The access points are coupled by a LAN to the switch so that upon receiving at one or more of the access points an uplink signal transmitted over the WLAN by the mobile station on the common frequency channel, the one or more of the access points convey messages responsively to the uplink signal over the LAN to the switch. A manager node is coupled to the switch so as to receive the messages and is adapted to process the messages so as to select one of the access points to respond to the uplink signal.

Abstract: An apparatus and method for polling stations that transmit periodic traffic streams are disclosed. The illustrative embodiment polls the station in accordance with a polling schedule that is generated to reduce the delay between (i) when the station queues a frame, and (ii) when the station transmits the frame. This reduces the waiting time of the frame in the station, and is, therefore, especially advantageous for latency-sensitive applications such as voice and video telecommunications. In accordance with the illustrative embodiment, a station that expects to periodically queue a frame for transmission sends a polling request to the polling coordinator, which request enables the polling coordinator to generate an advantageous polling schedule.

Abstract: A diversity receiving apparatus for use in an OFDM transmission radio communication/broadcasting system where OFDM signals are received by a plurality of antennas and input into a plurality of receivers. The OFDM received signals are further transformed into frequency spectra. Channel frequency responses are calculated by using OFDM received signal frequency spectra and a reference frequency spectrum generated in a reference spectrum generator. OFDM received signal frequency spectra distortions are compensated by using corresponding channel frequency responses. The transformed OFDM received signal frequency spectra are input into a selector unit as first input signals, while the distortion-compensated OFDM received signal frequency spectra are input into the selector unit as second input signals. The selector unit then selects a second input signal corresponding to a first input signal having maximum amplitude or maximum power.

Abstract: An Internet network based telephone call forwarding system comprising a home unit to which a user's telephone calls are directed and a remote unit to which a user's telephone calls are forwarded, wherein the home unit has an incoming line connectable to a telephone network and an outgoing line connectable to an Internet network and the remote unit has a line connectable to the Internet network, wherein the home unit is operable to forward calls directed to the home unit on the incoming line to the remote unit on the outgoing line via the Internet network.

Abstract: A method and apparatus for selecting a favored transmission slot for communicating non-voice data in conjunction with a voice-data communication. The slot, reflecting a favored power level and transmission rate for transmitting the non-voice data on a supplemental channel, is selected based upon the transmission power levels for voice-data transmitted by a base station to a remote station on a fundamental channel. The favored transmission slot is selected without the remote station messaging information to the base station concerning frequency channel or interference information for the supplemental channel.

Abstract: Methods, apparatuses and systems are provided for use in a wireless routing network. One apparatus, for example, includes an adaptive antenna that is configurable to receive a transmission signal from a transmitter and in response transmit corresponding outgoing multi-beam electromagnetic signals exhibiting a plurality of selectively placed transmission peaks and transmission nulls within a far field region of a coverage area. The adaptive antenna may also be configured to selectively receive at least one incoming electromagnetic signal directed through the coverage area. The adaptive antenna includes at least one antenna array and logic. The antenna array has a plurality of antenna elements. The logic is operatively coupled to the antenna array and configured to selectively control the placement of the transmission peaks and transmission nulls within the outgoing multi-beam electromagnetic signals.

Abstract: A signal quality parameter in a wireless network supporting plural network user devices is measured. Each user device measures a predetermined signal quality parameter of signals received from each of the other user devices in the network. Each user device broadcasts the measurements to other user devices in the network. Each user device calculates, for each of the other user devices, a value for the predetermined signal quality parameter from all the received measurements associated with that other user device.

Abstract: In a method for data transmission in a radio communications system, a radio interface is subdivided into time slots for a transmission of bursts. In this case, the data are transmitted in data channels in a time slot, in which data channels can be distinguished by use of individual spread codes. A finite burst containing data symbols and at least one midamble with known symbols is used for data transmission in a data channel. At least one parameter is determined for the traffic conditions of the radio interface, and a ratio of a length of the midamble and a data part with data symbols is adjusted depending on the traffic conditions. The method is suitable in particular for use in 3rd generation TD/CDMA mobile radio networks.

Abstract: The invention is a method and a network which provides mobile terminals (12) with the address of and access to application services. A network in accordance with the invention includes a plurality of mobile terminals which transmit and receive information transmitted through the network (100, 200); at least one storage (52), coupled to the network, which is accessible by the plurality of mobile terminals that provides services to the mobile terminals; and a directory storage (102), coupled to the plurality of mobile terminals, which stores addresses of the at least one storage and which provides in response to a communication at least one address of the at least one storage to at least one of the mobile terminals with which the plurality of terminals may communicate to obtain service therefrom.

Abstract: A system and method of creating affinity groups of portable communication device users, and distributing targeted content to said users is disclosed. The user affinity groups may be formed by comparing user profiles with each other or with a predefined affinity group profile definition.

Abstract: The present invention relates to a method and a system for compensating for doppler shift in a signal transmitted between a mobile station and a base station in a mobile communication system. In the method the doppler characteristic is determined for two selected portions of the received signal, the doppler characteristic being in the form of a phased offset for each selected portion. The larger phase offset is them used as a doppler characteristic to provide a doppler shift compensation for the received signal.

Abstract: A power control bit inserting method between a base station and a terminal. The base station and the terminal each use a plurality of adjacent frequency bands as signal paths with independent signal paths of a real part and an imaginary part given to each frequency. In the power control bit inserting method, a unit time is set to a power control group period, n-bit data is allocated to each signal path, the power control group period is divided by the number of signal paths, and a power control bit is inserted in each divided segment, so that the insertion positions in the real and imaginary parts of each frequency are spaced from each other by n/2 bit and the start position of the real signal path of each frequency is inserted at an appointed bit position of the corresponding frequency.

Abstract: The present invention comprises a system and method for pseudo-tunneling voice communications over a telecommunications network to preserve the quality of the voice call and reduce degradation due to tandemming loss. The pseudo-tunneling of the present invention comprises processing and routing voice packets as data packets. A voice packet is pseudo-tunneled by setting a pseudo-tunneling flag in the voice packet. The pseudo-tunneling flag provides an indication to network devices that the voice packet should be processed and routed like a data packets. Alternatively, one or more voice packets can be encapsulated in a routing packet for routing across a packet switched data network. The routing packet is pseudo-tunneled by setting a pseudo-tunneling flag in the header of the routing packet. Pseudo-tunneled vocoder frames are not converted into PCM or any other decompressed waveform representation of the voice signal, thereby avoiding tandemming loss and preserving bandwidth.

Abstract: Call control methods are disclosed for a multi-zone, packet-based communication system using certain host devices, termed reservation proxy elements, or RPEs to establish reservations of bandwidth for calls on behalf of other participating hosts. RPEs (132-138) receive and join a multicast group address to be used for a call, and exchange RSVP signaling messages across one or more inter-zone, packet network links (148, 150, 152, 154) to reserve communication resources for the call on behalf of participating devices in various zones. The RPEs receive the multicast group address from zone controller(s) (124-130) having received a call request for a talkgroup call. The zone controllers identify the multicast group address for the call and determine locations of participating devices and RPEs for the call.

Abstract: A method for providing message services is provided that includes receiving a user notification message in an application. A user identifier for at least one recipient of the message is received in the application. The user identifier is operable to identify the recipient. The message and the user identifier are provided from the application to a private network. The private network is operable to transmit the message to a mobile station for the recipient. The mobile station has a corresponding mobile station identifier, and the user identifier is assigned to the mobile station identifier in the private network.

Abstract: A method and apparatus for communicating between Customer Premises Equipment, (CPE) alarm sensing devices, and alarm monitoring stations. The sensing devices communicate with an end office switch by transmitting a message, such as a string of Dual-Tone Multi-Frequency, (DTMF) digits to that switch. At the switch, the message is processed and a determination is made which of a plurality of alarm monitoring stations should receive the alarm indication. One or more data packets are sent to the selected alarm monitoring stations with the packets identifying the source of the alarm indication, and the type of alarm indication. Advantageously, the packetized communication between the end office switch and the alarm monitoring system allows a high volume of alarm indications to be sent to an alarm monitoring station, because individual telephone connections are not required for each such alarm message.

Abstract: An Internet Protocol (IP)-based radio telecommunications network and method of providing data services to a mobile terminal. An Internet Protocol Shared Interworking Function (IP-SIWF) is implemented in the network, and is controlled from a Mobile Switching Center (MSC) utilizing the Media Gateway Control Protocol (MGCP) device control protocol. When a data call carrying a data payload is originated by a mobile terminal, the data call is transported utilizing radio access and radio link protocols to the IP-SIWF. The radio access and radio link protocols are terminated in the IP-SIWF, and the data payload is transported thereafter utilizing a real time protocol over a User Datagram Protocol (UDP) and an IP protocol layer.

Abstract: A system includes a first virtual end point processor (332) operably coupled to a plurality of channel elements (304) and a second virtual end point processor (340) operably coupled to a plurality of frame selectors (314). The system also includes at least one signaling manager (318, 334) that is arranged and constructed to establish a communication path that terminates at the first virtual end point processor (332) and the second virtual end point processor (340) prior to receiving a request for resources for a data call, such that set-up time for the data call through a wireless network is reduced.

Abstract: The invention relates generally to a method and an arrangement for transferring information in a packet radio service. Especially the invention applies to transferring delay sensitive data, such as speech and video data, in a mobile cellular telecommunications system. It is an object of this invention to provide a solution, in which the physical connection of a packet radio service is kept reserved also during the passive periods of a session but the same physical resource can still be shared between multiple users. In the present solution after the end of an active period of data transmission a predetermined time period is waited until the connection is released. The length of the time period is informed to the mobile station by the network on a dedicated or on a broadcast channel. The length of the time period is preferably made dependent on the required quality of service value of the connection and on the momentary communication activity in the network or cell.

Abstract: The invention provides techniques for selecting, on a dynamic basis, an interworking function (IWF) that can modify a communication protocol to a particular format required by bridged terminal equipment in a communication system. The IWF can be selected to ensure compatibility between transmission bandwidth, coding and other format parameters of a call and the corresponding parameters of its destination terminal in the system. An IWF in accordance with the invention may be utilized to allow a user to bind to different terminals having different capabilities over the duration of a given call. An IWF in accordance with the invention may also be used to insert additional data, retrieved from a database of the switch, into a reverse portion of the call directed from the destination terminal to the source terminal. The invention can thus be used to ensure that the established bandwidth between the destination terminal and the source terminal is substantially bidirectionally symmetric.

Abstract: The invention provides systems, including a methods and apparatus, for providing seamless telephone service across MSC's that support multiple or different protocols. In accordance with a preferred embodiment of the invention, the home mobile switching center, where the subscriber record is stored, is equipped to respond to a first inquiry signal from an originating mobile switching center by identifying itself to the originating mobile switching center. The incoming call may then be trunked to the home mobile switching center and forwarded to the visited mobile switching center according to the second protocol. According to another preferred embodiment, in response to the first inquiry signal, the home mobile switching center sends a second inquiry signal to the visited mobile switching center. The first inquiry signal represents a request for an identification number identifying, in the first protocol, the visited mobile switching center.

Abstract: A system to convert a network message into a wireless transport message includes a network-to-wireless transformation database with a message configuration table. An expansion agent processes a network message received from a computer network and information from the message configuration table to create a wireless transport message. The wireless transport message specifies attributes to facilitate the delivery of the network message to a wireless device. The attributes include a selected wireless message transport protocol and a selected wireless message transport conduit.

Abstract: The Pocket Concierge and Multimedia, Wireless Call Center Method and System, called herein the “Pocket Concierge service”, comprises three subsystems: an end-user subsystem, at least one call center subsystem, and one or more digital communications networks. A Pocket Concierge service operator provides various information and facilitation services to end-users.

Abstract: The invention relates to a method for transmitting packet switched data in a mobile communications system using an ARQ protocol. In the method the receiver requests, if necessary, retrasnmissions of the originally sent transmission unit, until the quality of the combined transmission unit formed of the originally sent transmission unit and its retransmitted copies corresponds to the predetermined quality level. The signal is not detected until after this. If the packet is interleaved and encoded and it is found out that the packet is not faultless, retransmissions of the transmission units of the packet that are of the poorer quality are requested. The invention also relates to a mobile communications system implementing the method of the invention.

Abstract: The invention relates to a method for transmitting packet switched data in a mobile communications system using an ARQ protocol. In the method the receiver orders the desired transmission units. The transmitter sends transmission units according to the order. Ordering and transmission are repeated until the quality measured by the receiver from each packet exceeds the predetermined quality value and the data which is to be transmitted and consists of packets is transmitted from the transmitter to the receiver. The invention also relates to a mobile communications system implementing the method of the invention.

Abstract: A mobile computer system capable of seamless roaming between wireless communication networks includes data processing resources for executing software, a plurality of wireless interfaces that supports simultaneous wireless connections with first and second wireless communication networks, and a network access arbitrator that routes data communicated between the software executed by the data processing resources and the first and second wireless communication networks. To permit seamless roaming, the network access arbitrator routes the data to the first wireless communication network via a first wireless interface and then seamlessly reroutes the data to a second wireless communication network via a second wireless interface. According to one embodiment, the network access arbitrator reroutes the data in response to the data bandwidths of the connections with the first and second wireless communication networks.