WO1997023063A1 - A sectorized base station - Google Patents

A sectorized base station Download PDF

Info

Publication number
WO1997023063A1
WO1997023063A1 PCT/FI1996/000660 FI9600660W WO9723063A1 WO 1997023063 A1 WO1997023063 A1 WO 1997023063A1 FI 9600660 W FI9600660 W FI 9600660W WO 9723063 A1 WO9723063 A1 WO 9723063A1
Authority
WO
WIPO (PCT)
Prior art keywords
base station
antenna
receiving antenna
sector
receiver
Prior art date
Application number
PCT/FI1996/000660
Other languages
French (fr)
Inventor
Jorma Pallonen
Original Assignee
Nokia Telecommunications Oy
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Nokia Telecommunications Oy filed Critical Nokia Telecommunications Oy
Priority to AU10684/97A priority Critical patent/AU1068497A/en
Publication of WO1997023063A1 publication Critical patent/WO1997023063A1/en

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/08—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the receiving station
    • H04B7/0802—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the receiving station using antenna selection
    • H04B7/0805—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the receiving station using antenna selection with single receiver and antenna switching
    • H04B7/0814—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the receiving station using antenna selection with single receiver and antenna switching based on current reception conditions, e.g. switching to different antenna when signal level is below threshold

Definitions

  • a sectorized base station A sectorized base station
  • the present invention relates to a sectorized base station having a coverage area that is divided into at least a first and a second sector, the base station comprising at least first receiver means, which comprise at least a first and a second antenna interface to which a first and a second receiving antenna directed to the first sector are connected for diversity reception, a third receiving antenna that is directed to the second sector, and second receiver means that are connected to the third receiving antenna, said receiving antennas being directed in such a way that the beam of the second receiving antenna covers at least partly the area between tne beams of the first and the third receiving antenna.
  • the first receiver means that comprise at least a first and a second antenna interface may consist, in this connection, optionally for example of two physically separate receiver units which enable the application of diversity reception, or alternatively, for example of one receiver unit comprising two inputs, i.e. antenna interfaces, so that this receiver unit enables the application of diversity reception.
  • the invention is not restricted to a case where diversity reception is only realized by means of two antennas, but the invention can equally well be implemented for example with four antennas and with one receiver unit comprising four inputs for realizing quadruple diversity reception.
  • the present invention relates particularly to a sectorized base station of a cellular radio system, i.e. to a base station that covers a geographical area divided into sectors.
  • the invention especially relates to a sectorized base station where at least two receiving antennas are directed to the same sector for the purpose of diversity reception, so that the receiver means of the base station simultaneously receive, via both antennas, signals transmitted by the same radio unit.
  • the use of for example two directional antennas, the first one having a beam directed for example to the left side of the sector and the second one comprising a beam directed to the right side of the sector so that the antenna beams overlap in the middle of the sector ensures that there are no shadow regions with poor audibility in the sector.
  • the part of the sector where the antenna beams of different antennas overlap provides better audibility (about 3 dB) than the parts of the sector to which only one antenna beam is directed.
  • the above-described better audibility results from the combination gain of the beams, i.e. their cooperation.
  • a drawback of the sectorized base station described above is that there is no combination gain at the borders between the base station sectors since the different sectors of the base station are usually served by separate receiver means that use their own individual frequency channels. In this way, a radio transmitter located near the border between the base station sectors is usually less well audible to the base station than a radio transmitter situated further from the border between the sectors, i.e. in the middle of the sector. Therefore, a radio transmitter moving from one sector of the base station to another is located in the area of poor audibility right before and after a handover.
  • the object of the present invention is to solve the above-described problem and to provide a base station that is capable of receiving, better than before, signals transmitted by radio transmitters located near the border between the sectors.
  • a base station according to the invention that is characterized m that the base station comprises monitoring means for monitoring signals received by the first receiver means via the first and the second receiving antenna, and a switching means that is responsive to the monitoring means and that is arranged to connect the first antenna interface of the first receiver means to the third receiving antenna when the first receiver means receive the signals transmitted by a certain radio unit with a substantially higher signal strength and/or quality via the second receiving antenna than via the first receiving antenna.
  • the invention is based on the idea that when the receiver means of the first sector of the base station are arranged to follow the radio unit as it moves to the vicinity of the border between the sectors or even to another sector, in such a way that the input of the receiver means where the signals transmitted by this radio unit are the least audible is connected by a switching means to the antenna means of the other sector, a similar combination gain of the antenna beams that has previously been provided only m the middle of the sector is also achieved at the border between the base station sectors. Therefore, a radio unit moving from one sector to another is far better audible to the base station than m prior arrangements. Only when the moving radio unit has travelled so far into the area of the second sector that it is considerably better, or at least equally, audible to the receiver means of the second sector than to the receiver means of the first sector, a handover is performed from one sector to the other.
  • the moment when the receiver means of the first sector should be connected to the antenna of the second sector can be solved for example on the basis of measuring the strength of the received signals, i.e. received signal strength indication (RSSI) .
  • RSSI received signal strength indication
  • the moment of connection can also be determined by means of an indicator describing the signal quality, such as the bit error rate (BER) .
  • BER bit error rate
  • the switching means is preferably selected in a time-division (TDMA) base station in such a way that it can be controlled specifically for each time slot.
  • TDMA time-division
  • a radio unit located on a traffic channel can be served when it moves from one sector to another without any interference, resulting from the coupling carried out by the switching means, on the other connections served via the same receiver means .
  • Figure 1 illustrates the first preferred embodiment of the base station according to the invention
  • FIG. 1 is a block diagram of the base station of Figure 1
  • FIGS 3 and 4 illustrate the second preferred embodiment of the base station according to the invention.
  • Figure 1 illustrates the first preferred embodiment of the base station according to the invention.
  • Figure 1 illustrates the orientation of beams of receiving antennas Al, A2 and B in a sectorized base station BTS.
  • the base station BTS may be for example a base station of a GSM mobile system.
  • the geographical area covered by the base station of Figure 1 is divided into two sectors (radio cells) SI and S2. Both sectors SI and S2 may use their own frequency channels.
  • the borders of the base station sectors are illustrated in Figure 1 by broken lines R.
  • the base station BTS comprises two receiving antennas Al and A2 by means of which the base station implements diversity reception from sector SI, and one receiving antenna B with which it receives signals from sector S2.
  • FIG. 1 shows, the antenna beams of antennas Al and A2 overlap in the middle of sector SI.
  • the area covered by both antenna Al and antenna A2 is hatched in Figure 1.
  • a radio transmitter for example a mobile station MS
  • the base station BTS can receive signals it transmits almost equally well by antenna Al and antenna A2. Due to the combined effect of the antennas, this area has a combination gain that may be for example 3 dB.
  • the base station BTS then connects those receiver means of sector SI that are normally connected to antenna Al to the antenna B of the other sector. Therefore, the receiver means of sector SI perform diversity reception with antennas A2 and B, so that a combination gain between the antenna beams is provided at the border R between the sectors. The audibility in the border area between the sectors is thus considerably improved.
  • the base station BTS carries out a handover wherein the mobile station is moved from the receiver means and frequency channel of sector SI to the receiver means and frequency channel of sector S2.
  • FIG. 2 is a block diagram of the base station of Figure 1.
  • the base station comprises a first receiver unit RX1 with which the base station implements diversity reception in sector SI by means of antennas Al and A2.
  • Sector S2 in turn uses only one antenna B and a receiver unit RX2.
  • the base station of Figure 2 may also comprise transmitting antennas for example in such a way that there is a separate transmitting antenna for each sector Si and S2.
  • antennas Al, A2 and B may operate in a manner known per se both as transmitting and receiving antennas.
  • the receiver unit RX1 implements diversity reception on the signals transmitted by an MS located in sector SI with antennas Al and A2, and it supplies the BERs and RSSIs describing the signals received from the different antenna branches to a control unit 2. If the MS is located near the border R between cells SI and S2, the control unit 2 detects this in such a way that the RSSI values of the signals received with antenna Al are considerably lower and the BER values higher than the corresponding values of the signals received with antenna A2. The control unit 2 then connects the switch 1 to another position, i.e. it connects the input 3 of the receiver unit RX1 of sector SI to antenna B of sector S2.
  • the control unit may determine the moment of connection either by means of the RSSI or the BER, or alternatively by means of a combination thereof.
  • the receiver unit RX1 implements diversity reception by means of antennas A2 and B until the base station performs a handover on the MS in a manner known per se when the MS has clearly moved to sector S2, whereafter the signals of the MS are received by receiver unit RX2.
  • Figures 3 and 4 illustrate the second preferred embodiment of the base station according to the invention.
  • a base station BTS' shown m Figures 3 and 4 corresponds to a great extent to the embodiment of Figures 1 and 2, but in the case shown in Figures 3 and 4 both sector SI and sector S2 comprise two receiving antennas.
  • the base station also comprises two switching means 1 and 1' instead of one, so that it is capable of producing a combination gain m the area R between the sectors both for mobile stations that move from sector Si to sector S2 and vice versa.
  • a receiver unit RX4 follows it in such a way that the input 4 of the receiver unit is connected by means of switch 1 ' to antenna A2 instead of antenna B2.
  • the base station BTS' comprises two receiver units for each sector SI and S2.
  • the base station may also comprise one fixed receiver RX2 and RX3 for each sector.
  • a fixed receiver refers in this connection to a receiver that continuously implements diversity reception with the same two antennas from the same sector.
  • the base station of Figure 4 comprises branching means 5, 5', 6 and 6' that preferably contain amplifiers for amplifying the received signals.
  • One output from each branching means is reserved for the switching means 1 or 1' .
  • the signals received with the receiving antennas are thus filtered with a band-pass filter before they are supplied to the branching means and further via the outputs of the branching means to a receiver unit either directly or alternatively via either one of the switching means.
  • the input 3 of the receiver RX1 therefore receives signals received either by antenna A2 or antenna Bl, depending on the position of the switching means 1.
  • the band-pass filter 7 provided in the branch should naturally be designed m such a way that it allows the passage of signals on the frequency band of both receivers.

Abstract

The present invention relates to a sectorized base station (BTS) comprising for diversity reception at least first receiver means (RX1) to which a first (A1) and a second (A2) receiving antenna directed to the first sector are connected, at least a third receiving antenna (B) that is directed to the second sector, and second receiver means (RX2) that are connected to the third receiving antenna (B). In order to provide better audibility at the border between the sectors, the base station comprises a switching means (1) that is arranged to connect the first antenna interface (3) of the first receiver means (RX1) to the third receiving antenna (B) when the first receiver means (RX1) receive the signals transmitted by a certain radio unit (MS) with a higher signal strength and/or quality via the second receiving antenna (A2) than via the first receiving antenna (A1).

Description

A sectorized base station
The present invention relates to a sectorized base station having a coverage area that is divided into at least a first and a second sector, the base station comprising at least first receiver means, which comprise at least a first and a second antenna interface to which a first and a second receiving antenna directed to the first sector are connected for diversity reception, a third receiving antenna that is directed to the second sector, and second receiver means that are connected to the third receiving antenna, said receiving antennas being directed in such a way that the beam of the second receiving antenna covers at least partly the area between tne beams of the first and the third receiving antenna.
The first receiver means that comprise at least a first and a second antenna interface may consist, in this connection, optionally for example of two physically separate receiver units which enable the application of diversity reception, or alternatively, for example of one receiver unit comprising two inputs, i.e. antenna interfaces, so that this receiver unit enables the application of diversity reception. However, the invention is not restricted to a case where diversity reception is only realized by means of two antennas, but the invention can equally well be implemented for example with four antennas and with one receiver unit comprising four inputs for realizing quadruple diversity reception.
The present invention relates particularly to a sectorized base station of a cellular radio system, i.e. to a base station that covers a geographical area divided into sectors. The invention especially relates to a sectorized base station where at least two receiving antennas are directed to the same sector for the purpose of diversity reception, so that the receiver means of the base station simultaneously receive, via both antennas, signals transmitted by the same radio unit. The use of for example two directional antennas, the first one having a beam directed for example to the left side of the sector and the second one comprising a beam directed to the right side of the sector so that the antenna beams overlap in the middle of the sector, ensures that there are no shadow regions with poor audibility in the sector. In fact, the part of the sector where the antenna beams of different antennas overlap provides better audibility (about 3 dB) than the parts of the sector to which only one antenna beam is directed. The above-described better audibility results from the combination gain of the beams, i.e. their cooperation. A drawback of the sectorized base station described above is that there is no combination gain at the borders between the base station sectors since the different sectors of the base station are usually served by separate receiver means that use their own individual frequency channels. In this way, a radio transmitter located near the border between the base station sectors is usually less well audible to the base station than a radio transmitter situated further from the border between the sectors, i.e. in the middle of the sector. Therefore, a radio transmitter moving from one sector of the base station to another is located in the area of poor audibility right before and after a handover.
The object of the present invention is to solve the above-described problem and to provide a base station that is capable of receiving, better than before, signals transmitted by radio transmitters located near the border between the sectors. This object is achieved with a base station according to the invention that is characterized m that the base station comprises monitoring means for monitoring signals received by the first receiver means via the first and the second receiving antenna, and a switching means that is responsive to the monitoring means and that is arranged to connect the first antenna interface of the first receiver means to the third receiving antenna when the first receiver means receive the signals transmitted by a certain radio unit with a substantially higher signal strength and/or quality via the second receiving antenna than via the first receiving antenna.
The invention is based on the idea that when the receiver means of the first sector of the base station are arranged to follow the radio unit as it moves to the vicinity of the border between the sectors or even to another sector, in such a way that the input of the receiver means where the signals transmitted by this radio unit are the least audible is connected by a switching means to the antenna means of the other sector, a similar combination gain of the antenna beams that has previously been provided only m the middle of the sector is also achieved at the border between the base station sectors. Therefore, a radio unit moving from one sector to another is far better audible to the base station than m prior arrangements. Only when the moving radio unit has travelled so far into the area of the second sector that it is considerably better, or at least equally, audible to the receiver means of the second sector than to the receiver means of the first sector, a handover is performed from one sector to the other.
According to the invention, the moment when the receiver means of the first sector should be connected to the antenna of the second sector can be solved for example on the basis of measuring the strength of the received signals, i.e. received signal strength indication (RSSI) . Alternatively, the moment of connection can also be determined by means of an indicator describing the signal quality, such as the bit error rate (BER) . With the use of either one of the aforementioned indicators, or a suitably weighted combination thereof, for example, the addition of new measurement means to the base station can be avoided since most of the known base stations already comprise means for measuring the aforementioned indicators.
The switching means is preferably selected in a time-division (TDMA) base station in such a way that it can be controlled specifically for each time slot. According to the invention, a radio unit located on a traffic channel can be served when it moves from one sector to another without any interference, resulting from the coupling carried out by the switching means, on the other connections served via the same receiver means .
The preferred embodiments of the base station according to the invention are disclosed in the appended dependent claims 2 to 6.
In the following, the invention will be described m greater detail, by way of example, by means of a few preferred embodiments of the base station according to the invention and with reference to the accompanying drawings, in which
Figure 1 illustrates the first preferred embodiment of the base station according to the invention,
Figure 2 is a block diagram of the base station of Figure 1, and
Figures 3 and 4 illustrate the second preferred embodiment of the base station according to the invention.
Figure 1 illustrates the first preferred embodiment of the base station according to the invention. Figure 1 illustrates the orientation of beams of receiving antennas Al, A2 and B in a sectorized base station BTS. The base station BTS may be for example a base station of a GSM mobile system.
The geographical area covered by the base station of Figure 1 is divided into two sectors (radio cells) SI and S2. Both sectors SI and S2 may use their own frequency channels. The borders of the base station sectors are illustrated in Figure 1 by broken lines R. The base station BTS comprises two receiving antennas Al and A2 by means of which the base station implements diversity reception from sector SI, and one receiving antenna B with which it receives signals from sector S2.
As Figure 1 shows, the antenna beams of antennas Al and A2 overlap in the middle of sector SI. The area covered by both antenna Al and antenna A2 is hatched in Figure 1. When a radio transmitter, for example a mobile station MS, is located in this area, the base station BTS can receive signals it transmits almost equally well by antenna Al and antenna A2. Due to the combined effect of the antennas, this area has a combination gain that may be for example 3 dB.
When the mobile station MS located in sector SI moves towards sector S2, it first arrives at the vicinity of the border R between the sectors so that the receiver means serving sector SI of the base station can hear the signals it transmits better via antenna A2 than antenna Al . However, since tne mobile station MS is also located near the limits of the area covered by antenna A2, its audibility is not the best possible via antenna A2, either. A handover to antenna B and the receiver means serving sector S2 does not improve the situation either, since near the border R the mobile station MS is poorly audible also via antenna B.
According to the invention, the base station BTS then connects those receiver means of sector SI that are normally connected to antenna Al to the antenna B of the other sector. Therefore, the receiver means of sector SI perform diversity reception with antennas A2 and B, so that a combination gain between the antenna beams is provided at the border R between the sectors. The audibility in the border area between the sectors is thus considerably improved.
Only after the mobile station has clearly crossed the border R between sectors SI and S2, the base station BTS carries out a handover wherein the mobile station is moved from the receiver means and frequency channel of sector SI to the receiver means and frequency channel of sector S2.
Figure 2 is a block diagram of the base station of Figure 1. As Figure 2 shows, the base station comprises a first receiver unit RX1 with which the base station implements diversity reception in sector SI by means of antennas Al and A2. Sector S2 in turn uses only one antenna B and a receiver unit RX2. The base station of Figure 2 may also comprise transmitting antennas for example in such a way that there is a separate transmitting antenna for each sector Si and S2. Alternatively, antennas Al, A2 and B may operate in a manner known per se both as transmitting and receiving antennas. In the situation shown in Figure 2, the receiver unit RX1 implements diversity reception on the signals transmitted by an MS located in sector SI with antennas Al and A2, and it supplies the BERs and RSSIs describing the signals received from the different antenna branches to a control unit 2. If the MS is located near the border R between cells SI and S2, the control unit 2 detects this in such a way that the RSSI values of the signals received with antenna Al are considerably lower and the BER values higher than the corresponding values of the signals received with antenna A2. The control unit 2 then connects the switch 1 to another position, i.e. it connects the input 3 of the receiver unit RX1 of sector SI to antenna B of sector S2. The control unit may determine the moment of connection either by means of the RSSI or the BER, or alternatively by means of a combination thereof. When the switching means 1 has changed its position (not shown in the figure) , the receiver unit RX1 implements diversity reception by means of antennas A2 and B until the base station performs a handover on the MS in a manner known per se when the MS has clearly moved to sector S2, whereafter the signals of the MS are received by receiver unit RX2.
Figures 3 and 4 illustrate the second preferred embodiment of the base station according to the invention. A base station BTS' shown m Figures 3 and 4 corresponds to a great extent to the embodiment of Figures 1 and 2, but in the case shown in Figures 3 and 4 both sector SI and sector S2 comprise two receiving antennas. The base station also comprises two switching means 1 and 1' instead of one, so that it is capable of producing a combination gain m the area R between the sectors both for mobile stations that move from sector Si to sector S2 and vice versa. In other words, if a mobile station moves for example from sector S2 towards sector SI, a receiver unit RX4 follows it in such a way that the input 4 of the receiver unit is connected by means of switch 1 ' to antenna A2 instead of antenna B2.
As Figure 4 shows, the base station BTS' comprises two receiver units for each sector SI and S2. In other words, in addition to receiver units RX1 and RX4 that move according to the invention, the base station may also comprise one fixed receiver RX2 and RX3 for each sector. A fixed receiver refers in this connection to a receiver that continuously implements diversity reception with the same two antennas from the same sector. In order for the receiver means of the same sector to be able to utilize the same receiving antennas, the base station of Figure 4 comprises branching means 5, 5', 6 and 6' that preferably contain amplifiers for amplifying the received signals. One output from each branching means is reserved for the switching means 1 or 1' . The signals received with the receiving antennas are thus filtered with a band-pass filter before they are supplied to the branching means and further via the outputs of the branching means to a receiver unit either directly or alternatively via either one of the switching means. For example the input 3 of the receiver RX1 therefore receives signals received either by antenna A2 or antenna Bl, depending on the position of the switching means 1.
In order that for example the receiver branch connected to antenna Bl could receive signals intended to both receiver RX1 and receiver RX4, the band-pass filter 7 provided in the branch should naturally be designed m such a way that it allows the passage of signals on the frequency band of both receivers. It should be understood that the above description and the related figures are only intended to illustrate the present invention. Different variations and modifications of the invention will be evident for those skilled in the art, without departing from the scope and spirit of the invention disclosed in the appended claims.

Claims

1. A sectorized base station (BTS, BTS') having a coverage area that is divided into at least a first (SI) and a second (S2) sector, the base station comprising at least first receiver means (RX1), which comprise at least a first (3) and a second (8) antenna interface to which a first (Al) and a second (A2) receiving antenna directed to the first sector (SI) are connected for diversity reception, a third receiving antenna (B, Bl) that is directed to the second sector (S2) , and second receiver means (RX2) that are connected to the third receiving antenna (B, Bl), said receiving antennas being directed in such a way that the beam of the second receiving antenna (A2) covers at least partly the area between the beams of the first (Al) and the third (B, Bl) receiving antenna, c h a r a c t e r i z e d in that the base station comprises monitoring means (2, 2') for monitoring signals received by the first receiver means (RX1) via the first and the second receiving antenna (Al, A2) , and a switching means (1) that is responsive to the monitoring means (2, 2') and that is arranged to connect the first antenna interface (3) of the first receiver means
(RX1) to the third receiving antenna (B, Bl) when the first receiver means (RX1) receive the signals transmitted by a certain radio unit (MS) with a substantially higher signal strength and/or quality via the second receiving antenna
(A2) than via the first receiving antenna (Al) .
2. A sectorized base station according to claim 1, c h a r a c t e r i z e d in that the switching means (1) is arranged to connect the first antenna interface (3) of the first receiver means (RXl) to the third receiving antenna (B, Bl) when the signal strength (RSSI) of the signals received by the first receiver means (RXl) from said radio unit (MS) via the first receiving antenna (Al) falls below a first predetermined threshold value, and when the signal strength (RSSI) of the signals received by the first receiver means (RXl) from said radio unit (MS) via the second receiving antenna (A2) exceeds a second predetermined threshold value.
3. A sectorized base station according to claim 1, c h a r a c t e r i z e d in that the switching means (1) is arranged to connect the first antenna interface (3) of the first receiver means (RXl) to the third receiving antenna (B, Bl) when the bit error rate (BER) of the signals received by the first receiver means (RXl) from said radio unit (MS) via the first receiving antenna (Al) exceeds the first predetermined threshold value and when the bit error rate (BER) of the signals received by the receiver unit (RXl) from said radio unit (MS) via the second receiving antenna (A2) falls below the second predetermined threshold value.
4. A sectorized base station according to claim 1, c h a r a c t e r i z e d in that the radio channels of said base station (BTS, BTS') are divided according to the TDMA principle into traffic channels, the switching means (1) being arranged to connect the first antenna interface (3) of the first receiver means (RXl) by time slots to the first (Al) or the third (B, Bl) antenna means.
5. A base station according to claim 1, c h a r¬ a c t e r i z e d in that said base station is a base station of the GSM mobile system.
6. A base station according to claim 1, c h a r¬ a c t e r i z e d m that the base station further comprises at least third (RX3) and fourth (RX4) receiver means for receiving signals from the first (SI) and the second (S2) sector, respectively, means for supplying the signals received with the first antenna means (Al) to a first branching means (5) the outputs of which provide signals to each of the receiver means (RXl, RX3) receiving signals from the first sector, and means for supplying the signals received with the third antenna means (Bl) to a second branching means (6') the outputs of which provide signals to each of the receiver means (RX2, RX ) receiving signals from the second sector (S2), said switching means (1) being arranged to supply to the first interface of the first receiver means (RXl) optionally either signals obtained from one output of the first branching means (5) or signals obtained from one output of the second branching means (6') .
PCT/FI1996/000660 1995-12-15 1996-12-12 A sectorized base station WO1997023063A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU10684/97A AU1068497A (en) 1995-12-15 1996-12-12 A sectorized base station

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FI956060 1995-12-15
FI956060A FI956060A (en) 1995-12-15 1995-12-15 Sectored base station

Publications (1)

Publication Number Publication Date
WO1997023063A1 true WO1997023063A1 (en) 1997-06-26

Family

ID=8544556

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/FI1996/000660 WO1997023063A1 (en) 1995-12-15 1996-12-12 A sectorized base station

Country Status (3)

Country Link
AU (1) AU1068497A (en)
FI (1) FI956060A (en)
WO (1) WO1997023063A1 (en)

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1999065159A1 (en) * 1998-06-08 1999-12-16 Q-Cell Gmbh Method and device for a full-duplex radio transmission system with cdma access
EP1107474A2 (en) * 1999-12-06 2001-06-13 Matsushita Electric Industrial Co., Ltd. Wireless communication base station
KR20100082405A (en) * 2009-01-09 2010-07-19 삼성전자주식회사 Method and device for beam forming in mobile communication system
WO2013105005A1 (en) * 2012-01-13 2013-07-18 Koninklijke Philips N.V. Wireless docking link budget optimization system
TWI681644B (en) * 2017-05-31 2020-01-01 美商谷歌有限責任公司 Full-duplex operation for radar sensing using a wireless communication chipset
US10754005B2 (en) 2017-05-31 2020-08-25 Google Llc Radar modulation for radar sensing using a wireless communication chipset
US10782390B2 (en) 2017-05-31 2020-09-22 Google Llc Full-duplex operation for radar sensing using wireless communication chipset
US10795009B2 (en) 2017-05-31 2020-10-06 Google Llc Digital beamforming for radar sensing using wireless communication chipset
US10845477B2 (en) 2017-05-10 2020-11-24 Google Llc Power management using a low-power radar
US11175718B2 (en) 2019-06-17 2021-11-16 Google Llc Mobile device-based radar system for applying different power modes to a multi-mode interface
US11550048B2 (en) 2019-05-20 2023-01-10 Google Llc Mobile device-based radar system for providing a multi-mode interface

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0454368A2 (en) * 1990-04-19 1991-10-30 Ericsson GE Mobile Communications Inc. Adaptive diversity equipment arrangement for cellular mobile telephone systems
US5428818A (en) * 1991-11-10 1995-06-27 Motorola Inc. Method and apparatus for reducing interference in a radio communication link of a cellular communication system
WO1995033312A1 (en) * 1994-06-01 1995-12-07 Motorola Inc. A method for selecting two antennas

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0454368A2 (en) * 1990-04-19 1991-10-30 Ericsson GE Mobile Communications Inc. Adaptive diversity equipment arrangement for cellular mobile telephone systems
US5428818A (en) * 1991-11-10 1995-06-27 Motorola Inc. Method and apparatus for reducing interference in a radio communication link of a cellular communication system
WO1995033312A1 (en) * 1994-06-01 1995-12-07 Motorola Inc. A method for selecting two antennas

Cited By (19)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1999065159A1 (en) * 1998-06-08 1999-12-16 Q-Cell Gmbh Method and device for a full-duplex radio transmission system with cdma access
US6834198B1 (en) 1998-06-08 2004-12-21 Q-Cell Gmbh Method and device for cellular base station antenna optimization
EP1107474A2 (en) * 1999-12-06 2001-06-13 Matsushita Electric Industrial Co., Ltd. Wireless communication base station
EP1107474A3 (en) * 1999-12-06 2003-05-21 Matsushita Electric Industrial Co., Ltd. Wireless communication base station
KR20100082405A (en) * 2009-01-09 2010-07-19 삼성전자주식회사 Method and device for beam forming in mobile communication system
KR101639643B1 (en) * 2009-01-09 2016-07-15 삼성전자주식회사 Method and device for beam forming in mobile communication system
WO2013105005A1 (en) * 2012-01-13 2013-07-18 Koninklijke Philips N.V. Wireless docking link budget optimization system
US9509418B2 (en) 2012-01-13 2016-11-29 Koninklijke Philips N.V. Wireless docking link budget optimization system
US10845477B2 (en) 2017-05-10 2020-11-24 Google Llc Power management using a low-power radar
US10914834B2 (en) 2017-05-10 2021-02-09 Google Llc Low-power radar
US10754005B2 (en) 2017-05-31 2020-08-25 Google Llc Radar modulation for radar sensing using a wireless communication chipset
US10782390B2 (en) 2017-05-31 2020-09-22 Google Llc Full-duplex operation for radar sensing using wireless communication chipset
US10795009B2 (en) 2017-05-31 2020-10-06 Google Llc Digital beamforming for radar sensing using wireless communication chipset
TWI681644B (en) * 2017-05-31 2020-01-01 美商谷歌有限責任公司 Full-duplex operation for radar sensing using a wireless communication chipset
US11079470B2 (en) 2017-05-31 2021-08-03 Google Llc Radar modulation for radar sensing using a wireless communication chipset
US11598844B2 (en) 2017-05-31 2023-03-07 Google Llc Full-duplex operation for radar sensing using a wireless communication chipset
US11550048B2 (en) 2019-05-20 2023-01-10 Google Llc Mobile device-based radar system for providing a multi-mode interface
US11175718B2 (en) 2019-06-17 2021-11-16 Google Llc Mobile device-based radar system for applying different power modes to a multi-mode interface
US11740680B2 (en) 2019-06-17 2023-08-29 Google Llc Mobile device-based radar system for applying different power modes to a multi-mode interface

Also Published As

Publication number Publication date
FI956060A (en) 1997-06-16
FI956060A0 (en) 1995-12-15
AU1068497A (en) 1997-07-14

Similar Documents

Publication Publication Date Title
US5752161A (en) Method and apparatus for replacing a failed channel unit of a sectored base station, in a cellular radio system, with an additional channel unit
US6850761B2 (en) Method for determining the position of a mobile station
US5303240A (en) Telecommunications system using directional antennas
EP0700173B1 (en) Method of route diversity in mobile radio communication systems
KR101400794B1 (en) Mobile communication repeating method in moving object and repeater thereof
US4608711A (en) Cellular mobile radio hand-off utilizing voice channel
US5504937A (en) Local traffic capacity control in a cellular radio network
US6574460B1 (en) Radiotelephone system for motor vehicles with a group antenna
WO2007108885B1 (en) Methods and apparatus for overlapping mimo antenna physical sectors
CA2332905A1 (en) Gsm transceiver unit equipped for time of arrival measurements
JP2000505254A (en) Antenna assembly for wireless communication device and related method
CA2305120A1 (en) Narrow beam traffic channel assignment method and apparatus
WO1995034997A3 (en) Diversity combining for antennas
WO1997023063A1 (en) A sectorized base station
EP0886391B1 (en) Wireless diversity device for high power transmission radio signal
US7783289B2 (en) Mobile communication system and controller, mobile station and method for use therein
JPH01300634A (en) Sector zone control system in mobile communication
WO2000051364A2 (en) Method for antenna gain acquisition in a cellular system
WO1996009733A2 (en) Base station
JP2001275142A (en) Mobile station
JP3877930B2 (en) Wireless communication system
KR100614055B1 (en) Method and apparatus for selecting moving repeater for transmitting service signal
JP2003124855A (en) Diversity reception system
JPH09238105A (en) System for controlling directional pattern of antenna for base radio station of mobile radio system
JP3208343B2 (en) Diversity device

Legal Events

Date Code Title Description
AK Designated states

Kind code of ref document: A1

Designated state(s): AU CN JP NO US

AL Designated countries for regional patents

Kind code of ref document: A1

Designated state(s): AT BE CH DE DK ES FI FR GB GR IE IT LU MC NL PT SE

DFPE Request for preliminary examination filed prior to expiration of 19th month from priority date (pct application filed before 20040101)
121 Ep: the epo has been informed by wipo that ep was designated in this application
NENP Non-entry into the national phase

Ref country code: JP

Ref document number: 97522318

Format of ref document f/p: F

122 Ep: pct application non-entry in european phase