EP0318033A2
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EP
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Handoff method for cellular digital mobile communication system and mobile station
Assignee: NEC Corp
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Filing: 1988-11-25
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Granted: —
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Expires: 2008-11-25
Abstract
Abstract According to a handoff method for a cellular digital mobile communication system, a communication test of a new channel is performed by utilizing a free time of a time-divisionally multiplexed channel. A mobile station of this invention includes a communication circuit for performing communication by using a time-divisionally multiplexed channel, a switching circuit for connecting a new channel during a free time of the time-divisionally multiplexed channel, and a communication test circuit for performing a communication test when the switching circuit is connected to the new channel.
Inventors
- 👤 Toshihito Kanai
- 👤 Yukitsuna Furuya
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-24 15:41
CPC Classifications
H; H04; H04W; H04W36/00; H04W36/0005; H04W36/0083; H04W36/0085; H04W36/0094
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
30 words
A handoff method for a cellular digital mobile communication system, comprising performing a communication test of a new communication channel during a free time of a time-divisionally multiplexed communication channel.
Claim 2
Dependent Claim
30 words
A handoff method for a cellular digital mobile communication system, comprising performing a communication test of a new communication channel during a free time of a time-divisionally multiplexed communication channel.
Claim 3
Dependent Claim
61 words
A mobile station comprising: communicating means for performing communication using a time-divisionally multiplexed communication channel; switching means for switching a present channel to a new channel during the free time of the time-divisionally multiplexed communication channel; and a communication test circuit for performing a communication test of the new channel when said switching means is connected to the new communication channel.
Claim 4
Dependent Claim
61 words
A mobile station comprising: communicating means for performing communication using a time-divisionally multiplexed communication channel; switching means for switching a present channel to a new channel during the free time of the time-divisionally multiplexed communication channel; and a communication test circuit for performing a communication test of the new channel when said switching means is connected to the new communication channel.
Claim 5
Dependent Claim
80 words
A cellular digital mobile communication system, wherein communication is performed using a time-divisionally multiplexed communication channel; a frequency is changed to that of a new communication channel when time slots of the time-divisionally multiplexed communication channel are completed; the new communication channel is switched to the time-divisionally multiplexed communication channel again when a communication test of the new communication channel is completed or a predetermined period of time has elapsed, thereby performing the communication test of the new communication channel.
Claim 6
Dependent Claim
80 words
A cellular digital mobile communication system, wherein communication is performed using a time-divisionally multiplexed communication channel; a frequency is changed to that of a new communication channel when time slots of the time-divisionally multiplexed communication channel are completed; the new communication channel is switched to the time-divisionally multiplexed communication channel again when a communication test of the new communication channel is completed or a predetermined period of time has elapsed, thereby performing the communication test of the new communication channel.
Claim 7
Dependent Claim
114 words
A mobile station comprising: communicating means for performing communication using a time-divisionally multiplexed communication channel; switching means for switching a frequency of the time-divisionally multiplexed communication channel into a frequency of a new communication channel when time slots of the time-divisionally multiplexed communication channel are completed and for switching from the new communication channel to the time-divisionally multiplexed communication channel when a communication test of the new communication channel is completed or a predetermined period of time has elapsed; and a communication test circuit for performing the communication test of the new communication channel while said switching means switches the frequency of the time-divisionally multiplexed communication channel to that of the new communication channel.
Claim 8
Dependent Claim
114 words
A mobile station comprising: communicating means for performing communication using a time-divisionally multiplexed communication channel; switching means for switching a frequency of the time-divisionally multiplexed communication channel into a frequency of a new communication channel when time slots of the time-divisionally multiplexed communication channel are completed and for switching from the new communication channel to the time-divisionally multiplexed communication channel when a communication test of the new communication channel is completed or a predetermined period of time has elapsed; and a communication test circuit for performing the communication test of the new communication channel while said switching means switches the frequency of the time-divisionally multiplexed communication channel to that of the new communication channel.
Claim 9
Dependent Claim
107 words
A handoff method for a cellular digital mobile communication system, wherein each base station transmits a signal including a flag representing presence/absence of a free communication channel, and a mobile station during communication causes a level monitor to receive the signals transmitted from the base station and a base station adjacent thereto, to compare reception levels of the base stations having free communication channels on the basis of the flags to monitor a change in cell site, and to switch a connection to a destination base station having the free communication channel upon transmission of a switching request signal when the change in cell site is detected.
Claim 10
Dependent Claim
107 words
A handoff method for a cellular digital mobile communication system, wherein each base station transmits a signal including a flag representing presence/absence of a free communication channel, and a mobile station during communication causes a level monitor to receive the signals transmitted from the base station and a base station adjacent thereto, to compare reception levels of the base stations having free communication channels on the basis of the flags to monitor a change in cell site, and to switch a connection to a destination base station having the free communication channel upon transmission of a switching request signal when the change in cell site is detected.
Claim 11
Dependent Claim
101 words
A mobile station comprising: a level detector for detecting reception levels of signals transmitted from a base station which communicate with the mobile station and a base station adjacent to said base station; a memory for storing an output from said level detector and a flag representing presence/absence of a free communication channel, the flag being included in the output; and a controller for comparing contents of said memory to monitor a change in cell site and for transmitting a switching request signal to a destination request signal having the free communication channel when the change in cell site is detected.
Claim 12
Dependent Claim
101 words
A mobile station comprising: a level detector for detecting reception levels of signals transmitted from a base station which communicate with the mobile station and a base station adjacent to said base station; a memory for storing an output from said level detector and a flag representing presence/absence of a free communication channel, the flag being included in the output; and a controller for comparing contents of said memory to monitor a change in cell site and for transmitting a switching request signal to a destination request signal having the free communication channel when the change in cell site is detected.
Claim 13
Dependent Claim
81 words
A handoff method for a cellular digital mobile communication system, wherein each base station comprises at least one time-divisional multiplex access radio transmitter/receiver, transmission/reception timings of the time-divisional multiplex access radio transmitter/receiver are identical within a given base station but are differentiated in adjacent base stations by one or more time slots, and a mobile station performs a communication test with a base station adjacent to a specific base station while the mobile station performs communication with the specific base station.
Claim 14
Dependent Claim
81 words
A handoff method for a cellular digital mobile communication system, wherein each base station comprises at least one time-divisional multiplex access radio transmitter/receiver, transmission/reception timings of the time-divisional multiplex access radio transmitter/receiver are identical within a given base station but are differentiated in adjacent base stations by one or more time slots, and a mobile station performs a communication test with a base station adjacent to a specific base station while the mobile station performs communication with the specific base station.
References Cited (Backward Citations)
No citation records indexed.
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