US 5,802,465 A · Data transmission in a radio telephone network

Abstract

For bidirectional transmission of packet data, a packet data service unit (Agent) is disposed in a digital cellular system connected to be in association with a Mobile Switching Center, and connecting the cellular network to the date network. As a mobile station is connected to the packet data service unit, signalling related to connection formation characteristics of the network is first accomplished. As a result thereof, the mobile station and the data service unit are provided with a number of stored parameters relating to each other. This situation creates or is called a virtual channel. When a mobile station wants to transmit or receive data packets between the mobile station and the data service unit a packet data transfer channel is established making use of the parameters of the virtual channel and thereby using substantially less signalling than the channel establishment signalling characteristic of the network, one part thereof being a radio channel and the other part a time slot in a digital trunk line. On termination of data packet transfer, at least said radio channel is disassembled but the virtual channel is maintained until the disconnection of the mobile station from the data service.

Claims32

Dependent claims

A radio telephone system comprising:

a mobile station having means for storing a first parameter, relating to another station, for setting up a real data communication channel having a reserved physical path between said mobile station and said another station;
and
said another station comprising a fixed station having means, wherein a second parameter relating to the mobile station for setting up said real data communication channel is capable of being stored, for forming a virtual data communication channel between the mobile station and the fixed station, said virtual data communication channel being a non-physical registration relationship using said first and second parameters and lacking a reserved path between said mobile station and said fixed station preparatory to the establishment of said real data communication channel, whereby the establishment of a real data communication channel is expedited when data is to be communicated between said mobile and fixed stations.

A digital time-division cellular network having a base station and a plurality of mobile stations, wherein radio channels between the mobile stations and the base station comprise:

a plurality of Traffic CHannels (TCH) for transferring speech and data between the mobile stations and the base station,
a control channel in association with each of said TCH channels, said control channels comprising:
a Random Access CHannel (RACH), for conducting signals from the mobile stations to the base station requesting a TCH channel,
a common Paging CHannel (PCH), for conducting a paging signal from the base station to a mobile station,
an Access Grant CHannel (AGCH), for conducting a signal from the base station to inform a mobile station of the TCH channel assigned thereto,
and further comprising:
a packet data service unit (Agent) for connecting the cellular network to a data network,
means for switching a mobile station to the Agent and signalling for the setting up of a connection to the data network,
means in a mobile station and the Agent for storing a number of parameters relating to each other, said parameters including a Radio Link Protocol (RLP) and forming a virtual channel, said virtual channel being a non-physical registration relationship using said parameters and lacking a reserved path between said mobile station and said Agent preparatory to the establishment of a packet data transfer channel,
means, responsive to a request from a mobile station to transfer or receive data packets, for assembling a packet data transfer channel between the mobile station and the Agent, making use of the parameters of the virtual channel, and wherein said packet data transfer channel comprises a first part comprising a radio channel between said mobile station and the base station and a second part comprising a time slot in a digital trunk line between said base station and said Agent,
means for transferring data packets over said packet data transfer channel,
means, responsive to the termination of data packet transfer over said packet data transfer channel, for disassembling at least said radio channel, and
means for maintaining the virtual channel until the release of a mobile station from the Agent.

10 more elements

Dependencies are inferred from the claim text.

Data transmission in a radio telephone network

Life of this patent

Data transmission in a radio telephone network

Life of this patent

Abstract

Claims32