Abstract:
The present invention relates to change of base stations transferring packet switched communications between a mobile station and a support node. The base station change is of lossless type allowing lossless base station change of packet switched communications in unacknowledged mode between the mobile station and the support node.
Abstract:
A system and method for facilitating the efficient operation of a mobile station as it transfers from communicating via one wireless data network to another. A session control node is coupled to the mobile node in such a manner that it selectively buffers data being transmitted to the mobile node, at least while the network transfer is being executed. When the mobile node had dropped its communication session with a first wireless network and established a new communication session with a second wireless network, the buffered data is read out and transmitted to the mobile node. The session control node may be coupled with a home network associated with the mobile node or a control node may be associated with the mobile node on an ad hoc basis.
Abstract:
Under the present invention, a method and system for improved handoff of a mobile device between wireless subnetworks is provided. Specifically, under the present invention, a mobile device will directly associate with a new access point of a new wireless subnetwork (layer 2 handoff) before associating with a agent of the new subnetwork (layer 3 handoff). Once the association with the new access point is complete, a forwarding request will be sent from the new access point to the old access point of the wireless subnetwork wit which the mobile device was previously associated. The forwarding request causes all data packets intended for the mobile device that are received by the old access point to be forwarded to the new access point. Then, once the mobile device has the completed its association with the agent of the new wireless subnetwork, the mobile device will receive data packets directly through the new subnetwork.
Abstract:
Es wird ein Verfahren zur Auswahl eines Übertragungskanals zur Übertragung von Nachrichten (N) von einem mobilen Endgerät an eine Basisstation beschrieben, bei dem das Endgerät ein Sendeberechtigungs-Anfragesignal (AP) für einen bestimmten Übertragungskanal an die Basisstation sendet und die Basisstation ein Antwortsignal (AWS) mit einem ersten Entscheidungswert (ACK, NACK). Damit wird dem Endgerät signalisiert, ob es zum Senden einer Nachricht (N) auf dem angefragten Übertragungskanal berechtigt ist oder nicht. Die Basisstation sendet bei Übermittlung eines ersten negativen Entscheidungstwerts (NACK) mit dem Antwortsignal (AWS) einen zweiten positiven Entscheidungswert (ACK2), wenn das Endgerät zum Senden einer Nachricht (N) auf einem anderen Übertragungskanal berechtigt ist. Das Endgerät analysiert bei einer Detektion eines ersten negativen Entscheidungswerts (NACK) das Antwortsignal (AWS) dahingehend weiter, ob es den zweiten positiven Entscheidungswert (ACK2) enthält und welche anderen Übertragungskanäle zur Verfügung stehen und sendet dann die Nachricht (N) auf einem der zur Verfügung stehenden Übertragungskanäle.
Abstract:
A dual mode (e.g. WLAN/UMTS) terminal with two network interfaces sends one interface to sleep mode following handover from one network to the other. Here sleep mode is synchronised with the end of the data stream, either by marking the stream or in response to sending a handover related SIP ACK message to the corresponding node.
Abstract:
Under the present invention, a wireless component such as an access point or a mobile device is configured to manage the buffering of newly transmitted TCP packets. Specifically, the wireless component can receive both forwarded TCP packets and newly transmitted TCP packets. If a set of newly transmitted TCP packets is received out of order (i.e., before a set of previously transmitted TCP packets that must be forwarded), one out of order (newly transmitted) TCP packet will be passed for each of a quantity of tokens present on the wireless component. Each out of order TCP packet that is not passed will be buffered. Once a previously requested forwarded TCP packet is received and passed, the quantity of tokens is restored to a predetermined quantity, and a commensurate number of buffered TCP packets can be passed.
Abstract:
The present invention relates to a Vestigial Side Band (VSB) Digital Television (DTV) in agreement with the DTV standards (A/53) of the Advanced Television System Committee (ATSC), and to a method thereof. More particularly, it provides 4-VSB DTV transceiver that improves reception performance of a receiver by transmitting and receiving dual streams formed of normal data and robust data without increasing average power, regardless of a mixing rate of the normal and robust data. The 4-VSB DTV transceiver of the present research includes an encoding unit for encoding the robust data to be mapped to one of two groups having 4 levels {-5, -3, 1, 7} and {-7, -1, 3, 5}.
Abstract:
A packet-switching connection is set up from a mobile station (MS) through a first transceiver unit, whereby the mobile station (MS) is assigned to a first cell and a first residence zone. As the mobile station (MS) moves to a second cell and a second residence zone, the connection is assigned a residence zone change identification. A transfer procedure for the packet-oriented connection from the first cell to the second cell is carried out. After the transfer procedure a data exchange by means of the packet-switched connection is reestablished. After reestablishing the data exchange a procedure for residence zone exchange is carried out.