WO2000002405A1 - Mobile telecommunication system - Google Patents
Mobile telecommunication system Download PDFInfo
- Publication number
- WO2000002405A1 WO2000002405A1 PCT/SE1999/001213 SE9901213W WO0002405A1 WO 2000002405 A1 WO2000002405 A1 WO 2000002405A1 SE 9901213 W SE9901213 W SE 9901213W WO 0002405 A1 WO0002405 A1 WO 0002405A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- lobe
- signal strength
- base station
- received signal
- dfu
- Prior art date
Links
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W88/00—Devices specially adapted for wireless communication networks, e.g. terminals, base stations or access point devices
- H04W88/08—Access point devices
Definitions
- Figure 1 discloses the construction of the lobe shaping system including the Direction Finding Unit according to the invention.
- the above localisation is achieved by allocating narrow antenna lobes (using LSU and an antenna array) covering the whole area inside a sector.
- the DFU simultaneously or preferably sequentially scans all receiving lobes. Upon detection of received signal strength in one or a multitude of the receiving lobes the lobe with highest signal strength is selected and the BSC establishes a configured lobe in the direction of the selected lobe for communication between the MS and a TRX.
- the MS. before sending signals to the BS must identify the BS. This is achieved by the BS transmitting identification signals in a wide lobe in order to inform MS, covered by said wide lobe, about its existence.
- the MS activates its transmitter as response to the paging to set up a MS initiated call on a new frequency after e.g. a handover order.
- Power starts to ramp up and before frame data is transmitted, the DFU must have identified the lobe with strongest RF-level. By scanning through the narrow lobes, the DFU will find the lobe with the strongest received signal strength. This narrow lobe is selected.
- the BSC sets up a path through the equipment with the selected lobe connected to the receiver.
- the DFU measures RSS and keeps a record of each lobe.
- the BSC reads the RSSI records from the DFU and connects continuously the best lobe to the receiver.
- the DFU measures RSSI and the BSC continuously connects the best lobe to receiver and transmitter.
- the mobile station is paged using a wide lobe in the down link, but the base station listens in the up link using narrow lobes scanned through possible directions.
- narrowing the up-link lobe from e.g. 60° to 10-18°, typically 15°, the antenna gain in the base station increases a factor of approx. 4-5 (6-7 dB).
- the base station may transmit in the down link with sufficient power in a wide lobe during call set-up or handover etc.,since the base station is not so sensitive with respect to the power consumption.
- a function scheme for the SSM function is described below. 1.
- the BSC Upon receiving a measurement activation order (MTX sends order to a TRX or SR unit), the BSC activates the DFU and the DFU is set to correct channel number and monitors the received signal.
- MTX sends order to a TRX or SR unit
- the DFU identifies the lobe with the strongest RF-level.
- the BSC sets up a path through the equipment with the selected lobe connected to the SR.
- SR performs RSSI and ⁇ tone measurements.
- NMT Nordic Mobile Telephone
- quality of a call is controlled by a control signal ( ⁇ tone) i.e. one of four tones around 4kHz.
- the base station transmits the ⁇ signal to the mobile station which returns the signal to the base station.
- the quality of the returned ⁇ signal is measured in the base station and if the quality is below a predetermined value the base station transmits an alarm to an MTX.
- the MTX orders the base station and surrounding base stations to measure the strength of the radio signal from the mobile station.
- the base stations send the measurement results to the MTX, after which the MTX connects the call to the base station with highest received signal strength.
Landscapes
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Mobile Radio Communication Systems (AREA)
Abstract
Description
Claims
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
IL14066299A IL140662A0 (en) | 1998-07-03 | 1999-07-02 | Mobile telecommunication system |
EP99933434A EP1095531A1 (en) | 1998-07-03 | 1999-07-02 | Mobile telecommunication system |
AU49491/99A AU4949199A (en) | 1998-07-03 | 1999-07-02 | Mobile telecommunication system |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
SE9802387-2 | 1998-07-03 | ||
SE9802387A SE514663C2 (en) | 1998-07-03 | 1998-07-03 | Mobile Telecommunications System |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2000002405A1 true WO2000002405A1 (en) | 2000-01-13 |
Family
ID=20411950
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/SE1999/001213 WO2000002405A1 (en) | 1998-07-03 | 1999-07-02 | Mobile telecommunication system |
Country Status (5)
Country | Link |
---|---|
EP (1) | EP1095531A1 (en) |
AU (1) | AU4949199A (en) |
IL (1) | IL140662A0 (en) |
SE (1) | SE514663C2 (en) |
WO (1) | WO2000002405A1 (en) |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO1995009490A1 (en) * | 1993-09-27 | 1995-04-06 | Telefonaktiebolaget Lm Ericsson | Using two classes of channels with different capacity |
WO1997044978A1 (en) * | 1996-05-22 | 1997-11-27 | Nokia Telecommunications Oy | Method and system for selecting an antenna beam of a base station of a radio system |
WO1997050272A2 (en) * | 1996-06-26 | 1997-12-31 | Northern Telecom Limited | Multi-beam antenna arrays for base stations in which the channel follows the mobile unit |
-
1998
- 1998-07-03 SE SE9802387A patent/SE514663C2/en not_active IP Right Cessation
-
1999
- 1999-07-02 WO PCT/SE1999/001213 patent/WO2000002405A1/en not_active Application Discontinuation
- 1999-07-02 EP EP99933434A patent/EP1095531A1/en not_active Withdrawn
- 1999-07-02 IL IL14066299A patent/IL140662A0/en unknown
- 1999-07-02 AU AU49491/99A patent/AU4949199A/en not_active Abandoned
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO1995009490A1 (en) * | 1993-09-27 | 1995-04-06 | Telefonaktiebolaget Lm Ericsson | Using two classes of channels with different capacity |
WO1997044978A1 (en) * | 1996-05-22 | 1997-11-27 | Nokia Telecommunications Oy | Method and system for selecting an antenna beam of a base station of a radio system |
WO1997050272A2 (en) * | 1996-06-26 | 1997-12-31 | Northern Telecom Limited | Multi-beam antenna arrays for base stations in which the channel follows the mobile unit |
Also Published As
Publication number | Publication date |
---|---|
AU4949199A (en) | 2000-01-24 |
SE514663C2 (en) | 2001-04-02 |
IL140662A0 (en) | 2002-02-10 |
SE9802387L (en) | 2000-01-04 |
SE9802387D0 (en) | 1998-07-03 |
EP1095531A1 (en) | 2001-05-02 |
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