Handover method for mobile radio system
Inactive Publication Date: 2002-04-30
TELEFON AB LM ERICSSON (PUBL)
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- Abstract
- Description
- Claims
- Application Information
AI Technical Summary
Benefits of technology
One object of the present invention is to achieve a handover where the risk of temporary interruption or lost connections can be sufficiently small.
A still further important advantage with the method in accordance with the invention is that it is particularly suitable in a mobile radio system where at least two base station transmitters are simultaneously responsible for transmitting message information to at least certain mobiles. In such a system the increasing degree of coverage can be utilised to the full in handing over the responsibility in accordance with the invention.
Problems solved by technology
At least in certain mobile radio systems, it is a problem to make the handover so that the risk of temporary interruption in a connection or that the connection is lost in conjunction with handover is suffiently small.
This problem is particularly great with peak traffic.
Another problem in connection with handover is the comparatively large need for signalling in the mobile radio system.
Method used
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Embodiment Construction
A method in accordance with the invention is particularly suitable for a mobile radio system where at least two base station transmitters are simultaneously responsible for transmitting message information to at least certain mobile stations. It seems therefore to be suitable to describe an embodiment of a method in accordance with the invention in connection with such a system.
A cellular mobile radio system illustrated in FIG. 1 has mobile and base stations with transmitters and receivers for radio signals. Message information is transmitted digitally to and from the mobiles by transmission and reception of radio signals with digital modulation corresponding to the message information. The radio signals are sent on one of a plurality of radio channels. Several radio channels can share in time multiplex the same radio frequency, and radio signals can be transmitted to and from several mobiles in different time slots on the radio frequency, these slots being associated with the radio...
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The invention relates to a method in mobile radio systems in which the responsibility for transmitting message information to a mobile station (MS1, MS2) is handed over from at least a first base station transmitter (Bma, Bmb) to at least a second base station transmitter (Bna, Bnb). In accordance with the invention, the same radio channel is used, if possible, before and after the handover for transmitting message information to the mobile station. If the same radio channel can be utilized, the handover takes place without the mobile station being informed beforehand of the handover by a special signal or order or the like. In digital mobile radio systems with digital transmission of message information by digital modulation of the radio signals, the transmission is preferably started from a second base station transmitter before the transmission is terminated from a first base station transmitter. During a transmission time substantially the same message information is transmitted to the mobile station from both at least one first and one second base station transmitter.
Description
TECHNICAL FIELDThe present invention relates to a mobile radio system which has a plurality of radio channels for transmitting control information and message information between base stations and mobile stations. More specifically, the invention relates to a method in which the responsibility for transmitting message information to a mobile station is handed over from at least a first base station transmitter to at least a second base station transmitter.BACKGROUND ARTIt is desirable that a mobile radio system has high traffic handling capacity and a high degree of coverage. The traffic handling capacity of a mobile radio system is dependent, inter alia, upon the number of available radio channels and how effectively these channels may be utilised. It is known to arrange several base stations with small covering areas close to each other in a mobile radio system. Available radio channels can then be utilised in a more efficient way for handling peak traffic within a limited geograp...
Claims
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Patent Timeline
Login to View More IPC IPC(8): H04Q7/38H04Q7/30H04W36/08H04W36/18H04W72/04
CPCH04M15/825H04M2215/32H04M2215/7853H04W36/0083H04W36/08H04W36/18
InventorUDDENFELDT, JAN E.RAITH, ALEX K.
OwnerTELEFON AB LM ERICSSON (PUBL)