EP0773637A1
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Method and apparatus for mobile indoor radio transmission using multiple antennas
Assignee: Telia Co AB
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Filing: 1996-10-16
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Granted: —
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Expires: 2016-10-16
Abstract
Abstract The present invention relates to a method and device at mobile radio system. Especially is related to a mobile radio system to be used in indoor environments. To bridge reception problems in areas with a not acceptable signal strength, a number of antenna arrangements are introduced. Information is transmitted consecutively over each of the antenna arrangements. The control of said transmissions is performed by one in the system arranged control logic. The reception conditions will in this way be made acceptable in the digital mobile telephone system.
Inventors
- 👤 Christer Gunmar
- 👤 Ulf Teght
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-30 14:54
CPC Classifications
H; H04; H04B; H04B7/00; H04B7/02; H04B7/04; H04B7/06; H04B7/0602; H04B7/0604
Claims Analysis
Total Claims: 27
Claim 1
Independent Claim
78 words
Method at mobile radio system, which mobile telephone system includes mobile units which communicate via fixed radio stations in the mobile radio system, and to the radio stations are connected antenna arrangements, characterized in that each of the radio stations is connected to at least two antenna arrangements, each of the radio stations transmits over one of the antenna arrangements at a time, and that the antenna arrangements are utilized alternatingly, at which a low fading is achieved.
Claim 2
Dependent Claim
25 words
Method according to patent claim 1, characterized in that the mobile telecommunication system is digital and that the information transmission is made in time slots.
Claim 3
Dependent Claim
37 words
Method according to patent claim 1 or patent claim 2, characterized in that the transmission over each of the antenna arrangements is made for a period of time corresponding to one or more time slots per mobile.
Claim 4
Dependent Claim
29 words
Method according to any of the previous patent claims, characterized in that frames, corresponding to a certain number of the time slots, are transmitted displaced over the antenna arrangements.
Claim 5
Dependent Claim
24 words
Method according to any of the previous patent claims, characterized in that the radio stations transmit over the antenna arrangements including alternative antenna sets.
Claim 6
Dependent Claim
48 words
Method according to any of the previous patent claims, characterized in that the antennas are placed close, at which transmission minima in certain points in the room correspond to transmission levels which are acceptable for reception from at least one of the other antennas in the antenna arrangement.
Claim 7
Dependent Claim
39 words
Method according to any of the previous patent claims, characterized in that the switching between subsets of the antennas in the digital system, for instance GSM, is made at the same pace as a jump frequency at frequency jumping.
Claim 8
Dependent Claim
22 words
Method according to any of the previous patent claims, characterized in that the switching between the antennas makes interference diversity gains possible.
Claim 9
Dependent Claim
23 words
Method according to any of the previous patent claims, characterized in that alternation between the antennas is controlled by an electronic control system.
Claim 10
Dependent Claim
31 words
Method according to patent claim 9, characterized in that the control system defines the subset of the antennas according to a current need and one at the occcasion existing traffic situation.
Claim 11
Dependent Claim
20 words
Method according to any of the previous patent claims, characterized in that the mobile radio system is divided into cells.
Claim 12
Dependent Claim
24 words
Method according to any of the previous patent claims, characterized in that the control system reconfigures the cells with regard to existing traffic distribution.
Claim 13
Dependent Claim
131 words
Device at mobile telephone system, which mobile telephone system is arranged to include base stations (BS), to which base stations antenna arrangements (A1, A2, ...An) can be connected, and mobile units (ME) are arranged to communicate via the mobile telephone system, and the communication is made in an environment where a signal strength at reception is unacceptable, and the mobiles are arranged to be in such signal strength minima for longer periods of time, characterized in that the antenna arrangements are arranged to be connected in consecutive periods of time, that signal strength minima for a first antenna arrangement corresponds to that the signal strength is acceptable for a second antenna arrangement, and that the reception condition for the mobiles (ME) is arranged to be acceptable independent of location in room.
Claim 14
Dependent Claim
19 words
Device according to patent claim 1, characterized in that the antenna arrangements are arranged to be at least two.
Claim 15
Dependent Claim
24 words
Device according to patent claim 1 or patent claim 2, characterized in that each antenna arrangement is arranged to include at least one antenna.
Claim 16
Dependent Claim
40 words
Device according to any of the patent claims 13 to 15, characterized in that control of radio transmission over the antenna arrangements is arrangend to be controlled by a control logic (C) in or in connection with the base station/stations.
Claim 17
Dependent Claim
39 words
Device according to any of the patent claims 13 to 16, characterized in that the control logic (C) is arranged to reconfigure the in the antenna arrangements included antennas depending on the need in a given point of time/situation.
Claim 18
Dependent Claim
27 words
Device according to any of the patent claims 13 to 17, characterized in that information transmission in the mobile telephone system is arranged to be made digitally.
Claim 19
Dependent Claim
24 words
Device according to any of the patent claims 13 to 18, characterized in that the mobile telephone system is arranged to be a GSM-system.
Claim 20
Dependent Claim
29 words
Device according to any of the patent claims 13 to 19, characterized in that the switching between the antenna arrangements is arranged to be made with a high frequency.
Claim 21
Dependent Claim
40 words
Device according to any of the patent claims 13 to 20, characterized in that the switching between the antenna arrangements is arranged to be made with roughly the same pace as a pace for a jump frequency at frequency jumping.
Claim 22
Dependent Claim
33 words
Device according to any of the patent claims 13 to 21, characterized in that information regarding frequency selection and antenna arrangement is arranged to be transmitted by the base stations to the mobiles.
Claim 23
Dependent Claim
31 words
Device according to any of the patent claims 13 to 22, characterized in that the mobiles are arranged to automatically perform necessary adjustments with regard to reception from respective antenna arrangement.
Claim 24
Dependent Claim
25 words
Device according to any of the patent claims 13 to 23, characterized in that the device is intended to be utilized in an indoor environment.
Claim 25
Dependent Claim
32 words
Device according to any of the patent claims 13 to 24, characterized in that in the indoor environment the antennas are arranged to be placed close to each other with different polarization.
Claim 26
Dependent Claim
22 words
Device according to any of the patent claims 13 to 25, characterized in that the antennas can be placed in different rooms.
Claim 27
Dependent Claim
31 words
Device according to any of the patent claims 13 to 26, characterized in that the antennas in one and the same room preferably are arranged to belong to different antenna arrangements.
References Cited (Backward Citations)
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