EP0719064A2
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Multi-mode radiotelephone apparatus
Assignee: Nokia Oyj
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Filing: 1995-09-29
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Granted: —
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Expires: 2015-09-29
Abstract
Abstract A radio telephone automatically hands over a call from one radio telephone system to another radio telephone system. Communication with respective radio telephone systems may be simultaneously continued during handover until the handover is complete, or communication with one radio telephone system ceases before communication with the other radio telephone system commences. Delays between signals of different radio telephone systems which would cause audible interference are inhibited by FIR filtering and/or dynamic time-warping. If an handover fails then communication with the original radio telephone system is re-started or continued.
Inventors
- 👤 John Daniel Byrne
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-03 18:51
CPC Classifications
H; H04; H04W; H04W36/00; H04W36/0005; H04W36/0055; H04W36/0079; H04W36/24; H04W36/30; H04W36/302; H04W36/14; H04W84/00; H04W84/02; H04W84/10; H04W84/105
Claims Analysis
Total Claims: 22
Claim 1
Independent Claim
91 words
A radio telephone operable for more than one radio telephone system, comprising communication means respectively associated with each of the radio telephone systems and control means for controlling the communication means, wherein a first communication means is responsive to the control means to automatically cease communication with a first radio system and a second communication means is substantially simultaneously responsive to the control means to automatically commence communication with a second radio system to effect handover of a call from a first radio telephone system to a second radio telephone system.
Claim 2
Dependent Claim
46 words
A radio telephone according to claim 1, wherein the first and second of the communication means are responsive to the control means to substantially simultaneously communicate with respective radio systems during said handover of a call from the first radio system to the second radio system.
Claim 3
Dependent Claim
26 words
A radio telephone according to claim 1 or claim 2, wherein the communications means communicates both speech signals and control signals to respective radio telephone systems.
Claim 4
Dependent Claim
24 words
A radio telephone according to any preceding claims, wherein communication with the first radio system is continued in the event of a handover failure.
Claim 5
Dependent Claim
23 words
A radio telephone according to any preceding claim, further comprising signal processing means adapted to inhibit sudden change in audio signals during handover.
Claim 6
Dependent Claim
30 words
A radio telephone according to claim 5, wherein the signal processing means comprises means for adapting signals in the first and second radio systems to overcome delays between said signals.
Claim 7
Dependent Claim
74 words
A radio telephone according to claim 6, wherein a first speech stream corresponding to the first radio system undergoes gradual attenuation during the handover of a call from the first radio telephone system to the second radio telephone system, a second speech signal corresponding to the second radio system undergoes gradual increasing amplification during handover, and the attenuated first speech signal and amplified second speech signal are combined to produce a single speech signal.
Claim 8
Dependent Claim
65 words
A radio telephone according to claim 6, wherein portions of a received first speech stream corresponding to the first radio telephone system are repeated in order to bring the first speech stream substantially into correspondence with a second speech stream corresponding to the second radio telephone system during the handover of a call from the first radio telephone system to the second radio telephone system.
Claim 9
Dependent Claim
65 words
A radio telephone according to claim 6, wherein portions of a received first speech stream corresponding to the first radio telephone system are removed in order to bring the first speech stream substantially into correspondence with a second speech stream corresponding to the second radio telephone system during the handover of a call from the first radio telephone system to the second radio telephone system.
Claim 10
Dependent Claim
25 words
A radio telephone according to any preceding claim and adapted to be operable in a cellular radio telephone system and a cordless radio telephone system.
Claim 11
Dependent Claim
26 words
A radio telephone according to claim 10, wherein the cellular-radio telephone system is a GSM system and the cordless radio telephone system is a DECT system.
Claim 12
Independent Claim
51 words
A method of operating a radio telephone for more than one radio telephone system, comprising respectively communicating with each of the radio telephone systems, automatically ceasing communication with a first radio system and automatically commencing communication with a second radio system for effecting handover of a call between respective radio systems.
Claim 13
Dependent Claim
32 words
A method according to claim 12, further comprising communicating with said respective radio systems substantially simultaneously during said handover of a call from the first radio system to the second radio system.
Claim 14
Independent Claim
21 words
A method according to claims 12 or 13, wherein both speech signals and control signals are communicated to respective radio systems.
Claim 15
Independent Claim
26 words
A method according to any of claims 12 to 14, wherein communication with the first radio system is continued in the event of a handover failure.
Claim 16
Independent Claim
24 words
A method according to any of claims 12 to 15, wherein signal processing is utilised to inhibit sudden changes in audio signals during handover.
Claim 17
Dependent Claim
23 words
A method according to claim 16, wherein signals in the first and second radio system are adapted to overcome delays between said signals.
Claim 18
Dependent Claim
73 words
A method according to claim 16, wherein a first speech stream corresponding to the first radio system undergoes gradual attenuation during the handover of a call from the first radio telephone system to the second radio telephone system, a second speech signal corresponding to the second radio system undergoes gradual increasing amplification during handover, and the attenuated first speech signal and amplified second speech signal are combined to produce a single speech signal.
Claim 19
Dependent Claim
64 words
A method according to claim 16, wherein portions of a received first speech stream corresponding to the first radio telephone system are repeated in order to bring the first speech stream substantially into correlation with a second speech stream corresponding to the second radio telephone system during the handover of a call from the first radio telephone system to the second radio telephone system.
Claim 20
Dependent Claim
64 words
A method according to claim 16, wherein portions of a received first speech stream corresponding to the first radio telephone system are removed in order to bring the first speech stream substantially into correlation with a second speech stream corresponding to the second radio telephone system during the handover of a call from the first radio telephone system to the second radio telephone system.
Claim 21
Independent Claim
24 words
A method according to any of claims 12 to 19 for operating in a cellular radio telephone system and a cordless radio telephone system.
Claim 22
Dependent Claim
26 words
A method according to claim 21, wherein the cellular radio telephone system is a GSM system and the cordless radio telephone system is a DECT system.
References Cited (Backward Citations)
US4989230A
Cited
WO1992003006A1
Cited
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