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公开(公告)号：EP0962112A1
公开(公告)日：1999-12-08
申请号：EP98903043.0
申请日：1998-02-11
发明人： KANERVA, Mikko , VAINIKKA, Jari , RÄSÄNEN, Juha , AALTO, Risto
摘要： The invention relates to a handover method in a mobile communication system in which error correction of a radio signal can be arranged with different protection levels. The method comprises measuring the signal level and/or quality of base stations (BTS) in a mobile station (MS), the signal quality and level of the mobile station (MS) at the base station (BTS) is measured, comparing measurements results thus obtained and other variables of the connection with handover criteria, and handover is performed from the source cell to the target cell, when the handover criteria are met. The invention is characterized by determining at least one handover criterion depending on error correction of the radio connection. The invention further relates to a mobile communication system for performing handover.
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公开(公告)号：EP0783811A2
公开(公告)日：1997-07-16
申请号：EP95932032.0
申请日：1995-09-26
CPC分类号： H04W28/18 , H04J3/1647 , H04J3/1694 , H04J3/247 , H04L47/2425 , H04L47/70 , H04L47/767 , H04L47/822 , H04L47/824 , H04W28/22 , H04W28/24 , H04W36/00 , H04W36/08 , H04W72/00 , H04W72/0446 , H04W76/10
摘要： The data transmission method involves assigning one or more time-slots to a mobile station for data transmission, depending on the data transfer rate required by an application using the mobile station. A data call minimum and maximum requirements is determined for the user data transfer rate. The channel configuration consisting of one or more time-slots is dynamically adjusts and assigned to the mobile station for a data call within the limits of the minimum and maximum requirements of the data channel, depending on a varying allocation level of network resources of a mobile communication network. The minimum and the maximum requirements for a user data transfer rate are indicated by the mobile station to the mobile communication network, upon setting up a data call. A channel configuration consisting of one or more time-slots is assigned for a data call in connection with call set-up or handover. The channel configuration depends on the network resources currently available in the mobile communication network and enables a data channel performance which is not lower than the minimum requirement and not higher than the maximum requirement.
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公开(公告)号：EP0770294A1
公开(公告)日：1997-05-02
申请号：EP96913556.0
申请日：1996-05-08
发明人： RÄSÄNEN, Juha , HÄMÄLÄINEN, Jari , KANERVA, Mikko , KARI, Hannu , VAINIKKA, Jari
CPC分类号： H04L1/1819 , H04L1/1809
摘要： The invention relates to a digital telecommunications system, and particularly a method for non-transparent data tranmission. There is a non-transparent data connection (V.110+L2R/RLP) between a transmitting party (A) and a receiving party (B), on which channel coding is employed. The transmission buffer buffers the data frames to be transmitted and stores the transmitted data frames until it receives an acknowledgement of successful reception. In accordance with the invention, this is avoided by monitoring the quality of the non-transparent connection, and if the quality of the connection drops to a specific threshold value, by changing the channel coding scheme of the connection for a more efficient one. Simultaneously, however, more channel capacity is allocated for the connection in according with the chosen channel coding scheme so that the original nominal user data rate can be maintained unchanged or nearly unchanged.
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公开(公告)号：EP0935902A1
公开(公告)日：1999-08-18
申请号：EP98903044.0
申请日：1998-02-11
发明人： KANERVA, Mikko , VAINIKKA, Jari , RÄSÄNEN, Juha , AALTO, Risto
摘要： The invention relates to a handover method in a mobile communication system in which error correction of a radio signal can be arranged with different protection levels. The method comprises measuring the signal level and/or quality of neighbouring base stations (BTS) at a receiver of a mobile station (MS), comparing the measurement results thus obtained and other variables of the connection with handover criteria, and performing a handover from the source cell to the target cell, when the pre-set handover criteria are met. The method of the invention is characterized by determining at least one error connection possible for the connection in a potential target cell for the handover, determining at least one handover criterion on the basis of the determined error correction of the potential target cell, and setting the error correction of the connection in the target cell (BTS2) as said error correction of the base station of the target cell. The invention further relates to a mobile communication system for performing handover.
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5.发明公开DATA TRANSMISSION SYSTEM WITH SLIDING-WINDOW DATA FLOW CONTROL 失效与GLEITFENSTERDATENFLUSSSTEURERUNG多通道数据传输系统
公开(公告)号：EP0788702A1
公开(公告)日：1997-08-13
申请号：EP96913557.0
申请日：1996-05-08
摘要： The invention relates to a digital data transmission system with a non-transparent circuit-switched data connection (V.110) between a transmitting (A) and a receiving party (B), whose nominal data transmission rate may vary during a call. The data connection uses a sliding-window data flow control protocol involving transmission of data frames in a preset order, checking the order of received data frames based on this order information, acknowledgement of properly received data frames and retransmission of incorrect or missing data frames. The transmissing party (A) may temporarily group the data frames, whereby the resulting 'wrong' order of frames inside the group or between groups may cause unnecessary retransmissions. In the invention this is eliminated so that the receiving party (B), upon detection of a missing data frame, delays the transmission of a retransmission request for a period of time that will ensure that the missing frame has not been sent later.
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公开(公告)号：EP0826280A1
公开(公告)日：1998-03-04
申请号：EP96913553.0
申请日：1996-05-07
CPC分类号： H04L1/1825 , H04L1/0002 , H04L1/16 , H04L1/1832 , H04L1/187 , H04L47/10 , H04L47/263 , H04L47/27
摘要： The invention relates to a digital data transmission system with a circuit-switched data connection (V.110) between a transmitting party (A) and a receiving party (B) the nominal data transmission rate of which may vary during the call. A sliding-window data flow control protocol is used on the data connection, in which a number of transmitted data frames to which the transmitting party (A) has not received an acknowledgement from the receiving party (B) is not allowed to exceed the size of the sliding window. In accordance with the invention, a unit (MSC) in the data transmission system that changes the nominal data transmission capacity (data transmission rate) of a non-transparent data connection notifies the change to the transmitting party (A) and to the receiving party (B). This information enables the receiving and transmitting parties to change the size of the sliding window in a controlled manner.
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公开(公告)号：EP0783826A2
公开(公告)日：1997-07-16
申请号：EP95932031.0
申请日：1995-09-26
IPC分类号： H04W28
CPC分类号： H04W28/18
摘要： The invention relates to a data transmission method in a TDMA mobile communication system. In a mobile communication system employing a so-called multi-slot access technique, one or more time-slots may be allocated to a mobile station for data transmission at the data transfer rate required by an application using the mobile station. In the invention, upon establishing a data call, the mobile station (MS) indicates the mobile communication network (BTS, BSC, MSC) the minimum and the maximum requirements for the user data transfer rate (Set Up). The mobile communication network assigns the mobile station (MS) for a data call a channel configuration, depending on the network resources currently available in the mobile communication network and enabling a data transfer rate which is between the minimum requirement and the maximum requirement.
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