Patent EP0642283A2 successfully refreshed from Google Patents.
EP0642283A2
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EP
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Data transmission in a radio telephone network
Assignee: Nokia Oyj
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Filing: 1994-09-05
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Granted: —
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Expires: 2014-09-05
Abstract
Abstract For bidirectional transmission of packet data, a packet data service unit (Agent) is in a digital cellular system connected to be in association with a Mobile Switching Center, said unit connecting the cellular network to the data network. As a mobile station is connected to the packet data service unit, signalling related to connection formation characteristic 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 of each other. Such situation is called 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 data 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 terminated 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.
Inventors
- 👤 Jari Hamalainen
- 👤 Timo Jokiaho
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-05 05:14
CPC Classifications
H; H04; H04W; H04W76/00; H04W76/10; H04W76/20; H04W76/25; H04W88/00; H04W88/16; H04W92/00; H04W92/04; H04W92/10
Claims Analysis
Total Claims: 35
Claim 1
Independent Claim
82 words
A radio telephone system comprising: a mobile station; and a fixed station, wherein a parameter of the mobile station for setting up a data communication channel is capable of being stored by the fixed station and a parameter of the fixed station for setting up a data communication channel is capable of being stored by the mobile station, for forming a virtual data communication channel between the mobile station and the fixed station, thereby expediting establishment of a real data communication channel.
Claim 2
Dependent Claim
82 words
A radio telephone system comprising: a mobile station; and a fixed station, wherein a parameter of the mobile station for setting up a data communication channel is capable of being stored by the fixed station and a parameter of the fixed station for setting up a data communication channel is capable of being stored by the mobile station, for forming a virtual data communication channel between the mobile station and the fixed station, thereby expediting establishment of a real data communication channel.
Claim 3
Dependent Claim
27 words
A system according to claim 1, adapted to form the virtual data communication channel if a mobile station having data communication capability registers with the fixed station.
Claim 4
Dependent Claim
32 words
A system according to claim 1, adapted to form the virtual data communication channel if a mobile station registered with the fixed station requests the setting up of a data communication channel.
Claim 5
Independent Claim
23 words
A system according to any of claims 1 to 3, wherein the data communication channel is a channel usually reserved for speech communication.
Claim 6
Independent Claim
19 words
A system according to any of claims 1 to 3, wherein the data communication channel is a control channel.
Claim 7
Independent Claim
29 words
A system according to any preceding claim, wherein there is provided a control means for controlling communication between the mobile station, the fixed station and an external communication network.
Claim 8
Independent Claim
18 words
A system according to any preceding claim, wherein the data communication channel is adapted for transmitting packet data.
Claim 9
Independent Claim
323 words
A system according to any preceding claim comprising a digital time-division cellular network having a Mobile Switching Center, a base station controller connected thereto, and a plurality of base stations connected to said base station controller, and a plurality of mobile stations, whereby the radio channels between the mobile station and the base station comprise: - a Traffic CHannel (TCH) for transfer of speech and data, and a control channel in association with said channel, - a Random Access CHannel (RACH), whereon the mobile stations request a traffic channel, - a common Paging CHannel (PCH), whereon a base station sends a paging signal to a mobile station, - an Access Grant CHannel (AGCH), whereon the base station informs the mobile station of the traffic channel assigned thereto, wherein the control means is a packet data service unit and is connected to the Mobile Switching Center, (Agent) for connecting the cellular network to a data network. - on switching a mobile station to the packet data service unit, signalling characteristic of the setting up of a connection to the network is performed, as a result of which the mobile station and the data service unit include stored a number of parameters of each other, said parameters including a Radio Link Protocol (RLP) and forming a virtual channel, - when a mobile station wants to transfer or receive data packets, a packet data transfer channel is assembled between the mobile station and the data service unit, making use of the data of the virtual channel, and therethrough by a substantially lesser amount of signalling than in channel assembly signalling typical of the network, one part of said transfer channel being a radio channel and the other part a time slot in a digital trunk line, - on terminated data packet transfer, at least said radio channel is disassembled whereas the virtual channel is maintained to the release of the mobile station from the data service.
Claim 10
Dependent Claim
135 words
System according to claim 8, wherein the packet data service unit (Agent) comprises means for: - registering all mobile stations connected to a packet data service under the control of the Mobile Switching Center, - informing the mobile station of any data packets addressed thereto, - transferring data packets from the mobile station addressed to the rest of the network, - transferring messages to the mobile station entering from the rest of the network, - buffering data packets, - performing encrypting / decrypting, - performing compression /decompression of the data to and from the mobile station, - updating a data base of the location of the mobile stations, - receiving the data packets addressed to the paging channel, - removing the mobile station from the register after it is disconnected from the packet data service.
Claim 11
Dependent Claim
44 words
System according to claim 8, or claim 9, wherein the packet data service unit (Agent) adapts the data packets from the network layer to virtual channel protocol packets, said virtual channel protocol packets being composed of one or more radio traffic protocol (RLP) frames.
Claim 12
Dependent Claim
32 words
System according to claim 10, wherein the virtual channel protocol packet is provided with an identification part indicating whether the contents of a packet contain signalling data or upper layer data packet.
Claim 13
Dependent Claim
46 words
System according to any of claims 8 to 11, wherein when a mobile station wants to transmit data packets, it sends on the random access channel a request for establishing a transfer channel, said request being a modification of the standard channel request of the network.
Claim 14
Dependent Claim
72 words
System according to any of claims 8 to 12, wherein when data packets are transferred to the mobile station, the base station sends a message on the common paging channel to it about a data packet transfer to come, whereafter the mobile station sends on the random access channel a request to the base for establishing a transfer channel, said request being a modification of the standard channel request of the network.
Claim 15
Dependent Claim
27 words
System according to claim 12 or 13, wherein the base station transmits the control channel data used in signalling to the mobile station, and transfer channel data.
Claim 16
Dependent Claim
42 words
System according to claim 14, wherein after the signalling between the mobile station and the packet data service unit, a second part of the packet data transfer channel is established, whereby the entire packet data transfer channel is ready for packet transfer.
Claim 17
Dependent Claim
21 words
System according to claim 15, wherein said signalling is carried out on a Dedicated Fast Access CHannel, FACCH of the network.
Claim 18
Dependent Claim
50 words
System according to any of claims 8 to 16, wherein a second part of the transfer channel is a direct PCM connection from the controller of the base station to the packet data service unit, whereby said part of the transfer channel is active irrespective of the packet data transfer.
Claim 19
Dependent Claim
42 words
18 System according to any of claims 8 to 16, wherein the second part of the transfer channel is a variable time slot on the PCM trunk line, whereby said second part is disassembled after the termination of the data packet transfer.
Claim 20
Dependent Claim
23 words
System according to any of claims 8 to 18, wherein the first part of the packet data transfer channel is a traffic channel.
Claim 21
Dependent Claim
59 words
System according to any of claims 8 to 18, wherein the first part of the packet data transfer channel is a random access channel when packet data are transferred from the mobile station to the packet data service unit, and the common paging channel when packet data are transferred from the packet data service unit to the mobile station.
Claim 22
Dependent Claim
41 words
System according to any of claims 8 to 18, wherein in the course of a transfer of packet data, the first part of the transfer channel is alternatively the traffic channel and the random access channel and the common paging channel.
Claim 23
Dependent Claim
41 words
System according to any of claims 8 to 21, wherein a paging message transmitted to all mobile stations (broadcast) of the cell and to certain mobile stations (multicast) is transmitted on the data section of the multicast and the broadcast protocol.
Claim 24
Independent Claim
72 words
A method of transmitting data in a radio telephone network comprising: storing a parameter of a mobile station for setting up a data communication channel at a fixed station; and storing a parameter of the fixed station for setting up a data communication channel at the mobile station, for forming a virtual data communication channel between the mobile station and the fixed station, thereby expediting establishment of a real data communication channel.
Claim 25
Independent Claim
72 words
A method of transmitting data in a radio telephone network comprising: storing a parameter of a mobile station for setting up a data communication channel at a fixed station; and storing a parameter of the fixed station for setting up a data communication channel at the mobile station, for forming a virtual data communication channel between the mobile station and the fixed station, thereby expediting establishment of a real data communication channel.
Claim 26
Dependent Claim
27 words
A method according to claim 23, further comprising forming the virtual data communication channel if a mobile station having data communication capability registers with the fixed station.
Claim 27
Dependent Claim
32 words
A method according to claim 23, further comprising forming the virtual data communication channel if a mobile station registered with the fixed station requests the setting up of a data communication channel.
Claim 28
Independent Claim
24 words
A method according to any of claims 23 to 25, further comprising utilising a communication channel usually reserved for speech communication for data communication.
Claim 29
Independent Claim
21 words
A method according to any of claims 23 to 25, further comprising utilising a control channel as a data communication channel.
Claim 30
Dependent Claim
38 words
A radio telephone adapted to store a parameter for setting up a communication channel of a fixed station for forming a virtual data communication channel with the fixed station thereby expediting establishment of a real data communication channel.
Claim 31
Dependent Claim
38 words
A radio telephone adapted to store a parameter for setting up a communication channel of a fixed station for forming a virtual data communication channel with the fixed station thereby expediting establishment of a real data communication channel.
Claim 32
Dependent Claim
31 words
A radio telephone according to claim 28, adapted to store said parameter if said radio telephone has a data communication ability and if said radio telephone registers with the fixed station.
Claim 33
Dependent Claim
32 words
A radio telephone according to claim 28, adapted to store said parameter if said radio telephone is registered with the fixed station and requests the setting up of a data communication channel.
Claim 34
Dependent Claim
17 words
A radio telephone adapted for use in a system according to any of claims 1 to 22.
Claim 35
Dependent Claim
17 words
A radio telephone adapted for use in a method according to any of claims 23 to 27.
References Cited (Backward Citations)
No citation records indexed.
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