EP0768804A2
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Mobile communication system capable of effectively carrying out a hand-over control
Assignee: NEC Corp
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Filing: 1996-10-10
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Granted: —
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Expires: 2016-10-10
Abstract
Abstract A mobile communication system of a cellular type has in each of cells a base station (12a-12c) for carrying out bidirectional communication between the base station and the a mobile station (11). The base station announces a transmission power of the base station and up link reception power and up link signal quality as information to the mobile station. The mobile station judges whether nor not it is necessary to carry out a hand-over control in accordance with the information and a predetermined hand-over control information. The mobile station judges whether or not it is necessary to carry out said hand-over control in accordance with a down link received signal strength indicator, a down link received signal quality, and the predetermined hand-over control information. The mobile station may judge whether or not it is necessary for the base station carries out a base transmission power control in accordance with the information and a base maximum transmission power. Furthermore the mobile station may judges whether or not it is necessary for the mobile station to carry out a mobile transmission power control in accordance with the information and a mobile maximum transmission power.
Inventors
- 👤 Shoji c/o NEC Corp. Tanaka
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-02 21:05
CPC Classifications
H; H04; H04W; H04W52/00; H04W52/04; H04W52/38; H04W52/40; H04W36/00; H04W36/0005; H04W36/0083; H04W36/0085
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
467 words
A mobile communication system of a cellular type having a service area divided into a plurality of cells and comprising in each of said cells a base station (12a-12c) for carrying out bidirectional communication between said base station and said a mobile station (11), said base station transmitting a base transmission signal to said mobile station by a base transmission power on said bidirectional communication, said mobile station transmitting a mobile transmission signal to said base station by a mobile transmission power on said bidirectional communication, charaterized in that said base station comprises: first measuring means (230, 213) for measuring a received signal strength indicator and a received signal quality in accordance with said mobile transmission signal to produce first measured information; first announcing means (210, 220) for announcing said first measured information and said base transmission power as base announcement information to said mobile station; first receiving means (230, 212) for receiving mobile announcement information from said mobile station; and first control means (200, 211) for controlling said base transmission power in accordance with said mobile announcement information; said mobile station comprising: second measuring means (130, 113) for measuring a received signal strength indicator and a received signal quality as a base received signal strength indicator and a base received signal quality in accordance with said base transmission signal to produce second measured information; second receiving means (130, 112) for receiving said base announcement information from said base station; first judging means (100) for judging whether nor not it is necessary to carry out a hand-over control in accordance with said second measured information, said base transmission power, and a predetermined hand-over control information, said first judging means further judging whether or not it is necessary for said base station carries out a base transmission power control in accordance with said second measured information, said base transmission power and a base maximum transmission power to produce a base power control signal when it is necessary for said base station to carry out said base transmission power control; second judging means (100) for judging whether or not it is necessary to carry out said hand-over control in accordance with said first measured information and said predetermined hand-over control information, said second judging means further judging whether or not it is necessary for said mobile station to carry out a mobile transmission power control in accordance with said first measured information and a mobile maximum transmission power to produce a mobile power control signal when it is necessary for said mobile station to carry out said mobile transmission power control; second announcing means (110, 120) for announcing said first measured information as mobile announcement information to said base station; and second control means (111) for controlling said mobile transmission power in accordance with said mobile power control signal
Claim 2
Dependent Claim
31 words
A mobile communication system as claimed in claim 1, characterized in that said base station (12a-12c) broadcasts said predetermined hand-over control information representative of up link and down link hand-over levels.
Claim 3
Dependent Claim
59 words
A mobile communication system as claimed in claim 2, characterized in that said base station (12a-12c) further broadcasts base maximum power information and mobile maximum power information, said base maximum power information being representative of a maximum transmission power of said base station, said mobile maximum power information being representative of a maximum transmission power of said mobile station.
Claim 4
Dependent Claim
170 words
A mobile communication system as claimed in claim 3, characterized in that said first judging means comprises: first means (S100, S113) responsive to said second measured information and said predetermined hand-over control information for judging whether or not each of said base received signal strength indicator and said base received signal quality is less than said down link hand-over level to produce a first judge result signal when each of said base received signal strength indicator and said base received signal quality is less than said down link hand-over level; second means (S111) responsive to said first judge result signal for judging whether or not said base transmission power is less than said base maximum transmission power to produce a second judge result signal when said base transmission power is less than said base maximum transmission power; and third means (S112, S115) responsive to said second judge result signal for making said second announcing means announce said mobile announcement information to said base station to increase said base transmission power.
Claim 5
Dependent Claim
156 words
A mobile communication system as claimed in claim 3, characterized in that said first judging means comprises: first means (S100, S113) responsive to said second measured information and said predetermined hand-over control information for judging whether or not each of said base received signal strength indicator and said base received signal quality is less than said down link hand-over level to produce a first judge result signal when each of said base received signal strength indicator and said base received signal quality is less than said down link hand-over level; second means (S111) responsive to said first judge result signal for judging whether or not said base transmission power is less than said base maximum transmission power to produce a second judge result signal when said base transmission power is not less than said base maximum transmission power; and third means (S114, S107) responsive to said second judge result signal for carrying out said hand-over control.
Claim 6
Dependent Claim
173 words
A mobile communication system as claimed in claim 3, characterized in that said first judging means comprises: first means (S100, S103) responsive to said second measured information and said predetermined hand-over control information for judging whether or not each of said base received signal strength indicator and said base received signal quality is less than said down link hand-over level to produce a first judge result signal when said base received signal quality is less than said down link hand-over level and when said base received signal strength indicator is not less than said down link hand-over level; second means (S101) responsive to said first judge result signal for judging whether or not said base transmission power is less than said base maximum transmission power to produce a second judge result signal when said base transmission power is not less than said base maximum transmission power; and third means (S104, S105) responsive to said second judge result signal for selecting another radio channel as a communication channel to communicate with said base station.
Claim 7
Dependent Claim
160 words
A mobile communication system as claimed in claim 3, characterized in that said second judging means comprises: first means (S200, S214) responsive to said first measured information and said predetermined hand-over control information for judging whether or not each of said mobile received signal strength indicator and said mobile received signal quality is less than said up link hand-over level to produce a first judge result signal when each of said mobile received signal strength indicator and said mobile received signal quality is less than said up link hand-over level; second means (S212) responsive to said first judge result signal for judging whether or not said mobile transmission power is less than said mobile maximum transmission power to produce a second judge result signal when said mobile transmission power is less than said mobile maximum transmission power; and third means (S213, S216) responsive to said second judge result signal for making said second control means increase said mobile transmission power.
Claim 8
Dependent Claim
156 words
A mobile communication system as claimed in claim 3, characterized in that said second judging means comprises: first means (S200, S214) responsive to said first measured information and said predetermined hand-over control information for judging whether or not each of said mobile received signal strength indicator and said mobile received signal quality is less than said up link hand-over level to produce a first judge result signal when each of said mobile received signal strength indicator and said mobile received signal quality is less than said up link hand-over level; second means (S212) responsive to said first judge result signal for judging whether or not said mobile transmission power is less than said mobile maximum transmission power to produce a second judge result signal when said mobile transmission power is not less than said mobile maximum transmission power; and third means (S215, S207) responsive to said second judge result signal for carrying out said hand-over control.
Claim 9
Dependent Claim
173 words
A mobile communication system as claimed in claim 3, characterized in that said second judging means comprises: first means (S200, S203) responsive to said first measured information and said predetermined hand-over control information for judging whether or not each of said mobile received signal strength indicator and said mobile received signal quality is less than said up link hand-over level to produce a first judge result signal when said mobile received signal quality is less than said up link hand-over level and when said mobile received signal strength indicator is not less than said up link hand-over level; second means (S201) responsive to said first judge result signal for judging whether or not said mobile transmission power is less than said mobile maximum transmission power to produce a second judge result signal when said mobile transmission power is not less than said mobile maximum transmission power; and third means (S204, S205) responsive to said second judge result signal for selecting another radio channel as a communication channel to communicate with said base station.
References Cited (Backward Citations)
No citation records indexed.
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