Method and apparatus for establishing direct mobile to mobile communication between cellular mobile terminals
A mobile terminal and cellular mobile technology, which is applied in the direction of selection device, wireless communication, connection management, etc., and can solve the problem that users cannot establish or maintain calls
Inactive Publication Date: 2007-06-27
MOTOROLA INC
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- Application Information
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Problems solved by technology
In the absence of infrastructure support, and if there is no other method of supporting communication, it is generally impossible for users to establish or maintain calls
Method used
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[0016] While the invention can be affected by various forms of embodiments shown in the drawings, preferred embodiments will be described below, and it is to be understood that the present disclosure should be considered as an example of the invention and should not be regarded as Restricted to specific illustrated examples.
[0017] Figure 1 illustrates an example of a communication 10 between a base station 12 and a mobile user 14, as well as a number of examples of direct communications between two mobile users 14, involving a coverage area 16 in a region 18, in a cellular network The aforementioned coverage areas support at least some cellular communications. The figure illustrates direct communication between at least three pairs of mobile users 14, each pair having a different relationship to a supported coverage area 16. There are at least three possibilities defining the relationship of one or two mobile users 14 of direct communication with respect to the coverage ar...
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The present invention provides a method for establishing direct mobile to mobile communication between cellular mobile terminals and a device thereof. The method includes selecting a frequency designated as a mobile communication frequency within a cellular communication system, and transmitting a communication initiation sequence at the selected frequency by a first mobile terminal. A second mobile terminal then monitors the designated mobile communication frequencies, and detects the communication initiation sequence. In at least one embodiment, selecting a frequency includes determining the region in which the first mobile terminal is operating, and selecting a mobile communication frequency for the determined region. In at least a further embodiment, the mobile communication frequency is a mobile transmission frequency for the determined region. In at least a still further embodiment, selecting a frequency includes selecting a frequency that is designated as a mobile transmit frequency in a first supported region and is designated as a mobile receive frequency in a second supported region.
Description
technical field [0001] The present invention relates generally to establishing direct mobile-to-mobile communications between cellular mobile terminals, and in particular to establishing communications in a cellular communications system using at least one or more frequencies pre-designated as mobile communications frequencies. Background technique [0002] Cellular communication systems typically rely on an established infrastructure to process and manage calls. In most cellular systems, calls originating from two mobile cellular terminals are typically routed to the area in which the mobile terminals are located through each of one or more serving base stations. However, since the network cannot cover all areas, the mobile terminal may be outside the network coverage area at some point. In this case, communication through this system is not possible. [0003] Typically the operator has the right to use a relevant portion of the spectrum for cellular operation in a geogra...
Claims
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IPC IPC(8): H04Q7/20H04W4/10H04W84/08H04W84/18
CPCH04W76/005H04W84/08H04W4/10H04W84/18H04W76/45
Inventor 格雷格·R·布莱克查尔斯·P·宾塞尔乔治·W·梅耶尔
Owner MOTOROLA INC