Source: http://www.google.fr/patents/US6134439
Timestamp: 2013-05-20 01:44:14
Document Index: 732175575

Matched Legal Cases: ['art.\n16', 'art 1', 'art 2', 'art 3', 'art 4', 'art 5', 'art 6', 'art 7', 'art 8', 'art 1', 'art 2', 'art 3', 'art 4', 'art 5', 'art 6', 'art 7', 'art 8']

Brevet US6134439 - DECT/GSM external handover - Google�BrevetsRecherche Images Maps Play YouTube Actualit�s Gmail Drive Plus » Recherche avanc�e dans les brevets | Historique Web | Connexion Recherche avanc�e dans les brevets BrevetsA method for controlling handover of a DECT portable part from a first DECT fixed part to a second DECT fixed part during provision of a data service, both fixed parts communicating with a GSM mobile switch center, the method comprising the first fixed part detecting that the handover has been requested,...http://www.google.fr/patents/US6134439?utm_source=gb-gplus-shareBrevet US6134439 - DECT/GSM external handover Num�ro de publicationUS6134439 AType de publicationOctroi Num�ro de demande08/949,013 Date de publication17 oct. 2000 Date de d�p�t10 oct. 1997 Date de priorit�11 oct. 1996Autre r�f�rence de publicationEP0836338A2EP0836338A3EP0836338B1US6278880 InventeursMarkus Tapani HakasteTuomo Sipila Cessionnaire d'origineNokia Mobile Phones Limited Classification aux �tats-Unis455/436455/442 Classification internationaleH04W36/14 Classification coop�rativeH04W28/04H04W36/0066H04L1/1887H04L2001/0097H04L2001/0092 Classification europ�enneH04W 36/00P6NH04L 1/18T7R�f�rencesCitations de brevets (9)Citations hors brevets (49) R�f�renc� par (20)Liens externesUSPTO Cession USPTO EspacenetDECT/GSM external handoverUS 6134439 A R�sum� A method for controlling handover of a DECT portable part from a first DECT fixed part to a second DECT fixed part during provision of a data service, both fixed parts communicating with a GSM mobile switch center, the method comprising the first fixed part detecting that the handover has been requested, and in response modifying its control of the link between itself and the mobile switch center to inhibit acknowledgement to the mobile switch center of data not received by the portable part from the first fixed part.
16. In the combination of a GSM communication system including a mobile switching center, a first DECT communication system including a first DECT fixed part, and a second DECT communication system including a second DECT fixed part, wherein each of the first and the second DECT fixed parts is operative for communication with a DECT portable part over an air interface and communication with the mobile switching center via a link, thereby allowing the mobile switching center to communicate data to the DECT portable part via either one of the first or the second DECT fixed parts, each of which is operative to acknowledge to the mobile switching center receipt of said data, a method for controlling handover of the DECT portable part from the first DECT fixed part to the second DECT fixed part during provision of a data service, the method comprising steps of: the first fixed part detecting that the handover has been requested and, in response, modifying control by the first fixed part of the link between the first part and the mobile switching center to avoid acknowledgement to the mobile switching center of said data.
17. In the combination of a GSM communication system including a mobile switching center, a first DECT communication system including a first DECT fixed part, and a second DECT communication system including a second DECT fixed part, wherein each of the first and the second DECT fixed parts is operative for communication with a DECT portable part over an air interface and for communication with a mobile switching center via a link, thereby allowing the mobile switching center to communicate data to the DECT portable part via either one of the first or the second DECT fixed parts, a method for controlling handover of the DECT portable part from the first DECT fixed part to the second DECT fixed part during provision of a data service, both of the fixed parts communicating with the GSM mobile switching center, the method comprising steps of: the first DECT fixed part relaying protocol messages between its interface with the DECT portable part and its link with the mobile switching center according to a predetermined mapping, the relaying step providing for an avoiding of acknowledgement to the mobile switching center of data which has been received from the mobile switching center at the first DECT fixed part but has not been received at the DECT portable part.
______________________________________LAPU Message       RLP        Parameter mapping______________________________________SABM        SABM       P/F.sub.LAPU = P/F.sub.RLPUA          UA         P/F.sub.LAPU = P/F.sub.RLPDECT CC     XID        The LAPU/RLP parametermessage info           negotiation (see text)I-frame     I + S frame                  N(S).sub.LAPU = N(S).sub.RLP                  N(R).sub.LAPU = N(R).sub.RLP                  P/F.sub.LAPU = P/F.sub.RLPRR          RR         N(R).sub.LAPU = N(R).sub.RLP                  P/F.sub.LAPU = P/F.sub.RLPRNR         RNR        N(R).sub.LAPU = N(R).sub.RLP                  P/F.sub.LAPU = P/F.sub.RLPREJ         REJ        N(R).sub.LAPU = N(R).sub.RLP                  P/F.sub.LAPU = P/F.sub.RLP--          SREJ       No mapping--          DISC       No mapping DECT shall do                  a LLME LAPU link release--          DM         No mapping--          NULL       No mapping--          TEST       No mapping______________________________________
As a result of this functionality the RLP and LAPU functions are synchronised and to a large extent consistent with each other to provide optimised end-to-end error recovery. When an external handover occurs the DECT LLME continues the old LAPU connection over the new radio connection. The LAPU may use in the link initialisation process the values of the old link and start data transmission immediately. When the transmission link is established in the new FP the current values of the LAPU parameters are carried to the new FP in the {CC-SETUP} message &lt;&lt;window size&gt;&gt; parameter (at 33 in FIG. 11). The new RLP entity in the new FP is initialised by using these values. The new RLP may also re-negotiate the parameters by issuing XID to the MSC RLP entity. When the new RLP link has been established, data transmission may continue and the RLP entity in the new FP updates the RLP state parameters according the received/sent frames.
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