Inter-system communications in mobile communications system
First Claim
1. A communications device for inter-system communications the communications device comprising:
- a private mobile radio PMR communications unit for PMR communications with a PMR system element,a public land mobile network PLMN communications unit for PLMN communications with a PLMN system element, anda converter for performing conversion between PMR communications and PLMN communications, wherein the converter is arranged to perform, for an information unit requiring inter-system transfer, a conversion between a format used for PMR communications and a format used for PLMN communications, whereinthe communications device is arranged to buffer the converted information unit or the information unit requiring inter-system transfer,the communications device is arranged to request establishment of a communications session or an authorization for data transfer to a target system part,the communications device is arranged to transmit the converted information unit via the target system part as a response to receiving an authorization to transfer,the communications device is arranged to function as a member of a communications group and the communications device is arranged to prioritize the communications device over other group members of the communications group.
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Accused Products
Abstract
The present invention relates to a method of arranging inter-working for a communications system comprising a PMR (private mobile radio) system part and a PLMN (public land mobile network) system part. The system comprises a mobile intermediate device capable of communicating with the PMR system part and the PLMN system part and comprising a converter for performing protocol conversion between the PMR system part and the PLMN system part, the method comprising: detecting in the intermediate device a need for inter-system transfer from a source system part to a target system part, performing by the converter conversion for an information unit from a source system to a format appropriate in the target system part; and transmitting the converted information unit to the target system part.
19 Citations
9 Claims
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1. A communications device for inter-system communications the communications device comprising:
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a private mobile radio PMR communications unit for PMR communications with a PMR system element, a public land mobile network PLMN communications unit for PLMN communications with a PLMN system element, and a converter for performing conversion between PMR communications and PLMN communications, wherein the converter is arranged to perform, for an information unit requiring inter-system transfer, a conversion between a format used for PMR communications and a format used for PLMN communications, wherein the communications device is arranged to buffer the converted information unit or the information unit requiring inter-system transfer, the communications device is arranged to request establishment of a communications session or an authorization for data transfer to a target system part, the communications device is arranged to transmit the converted information unit via the target system part as a response to receiving an authorization to transfer, the communications device is arranged to function as a member of a communications group and the communications device is arranged to prioritize the communications device over other group members of the communications group. - View Dependent Claims (2, 3, 4, 5)
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6. A method of arranging interworking for a communications system comprising a private mobile radio PMR system part, a public land mobile network PLMN system part, and a mobile intermediate device capable of communicating with the PMR system part and the PLMN system part and comprising a converter for performing conversion for communications between the PMR system part and the PLMN system part, the method comprising:
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detecting in the intermediate device a need for inter-system transfer from a source system part to a target system part, performing by the converter conversion for an information unit from the source system part to a format appropriate in the target system part; and transmitting the converted information unit to the target system part, wherein the converted information unit or the information unit requiring inter-system transfer is buffered by the intermediate device, establishment of a communications session or an authorization to transfer an information unit via the target system part is requested, and the converted information unit is transmitted via the target system part as a response to receiving an authorization, wherein the intermediate device functions as a member of a communications group and the intermediate device is prioritized over other members of the communications group. - View Dependent Claims (7, 8)
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9. A communications system comprising:
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a private mobile radio PMR unit for PMR communications, a public land mobile network PLMN unit for PLMN communications, a mobile converter unit for performing conversion between the PMR communications and PLMN communications, wherein the mobile converter unit is arranged to perform, for an information unit requiring inter-system transfer, a conversion between a format used by the PMR unit and a format used by the PLMN unit, wherein the system is arranged to buffer the converted information unit or the information unit requiring inter-system transfer, the system is arranged to request establishment of a communications session or a an authorization to transfer an information unit via the target system part, the system is arranged to transmit the converted information unit via the target system part as a response to receiving an authorization, a communications device comprising the mobile converter unit is arranged to function as a member of a communications group, and the system is arranged to prioritize the communications device over other members of the communications group.
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Specification