WO1995006369A1 - A method for adding capacity of a base station - Google Patents

A method for adding capacity of a base station Download PDF

Info

Publication number
WO1995006369A1
WO1995006369A1 PCT/FI1994/000370 FI9400370W WO9506369A1 WO 1995006369 A1 WO1995006369 A1 WO 1995006369A1 FI 9400370 W FI9400370 W FI 9400370W WO 9506369 A1 WO9506369 A1 WO 9506369A1
Authority
WO
WIPO (PCT)
Prior art keywords
base station
coverage area
antenna means
channel unit
antenna
Prior art date
Application number
PCT/FI1994/000370
Other languages
French (fr)
Inventor
Jukka Suonvieri
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 AU75006/94A priority Critical patent/AU7500694A/en
Publication of WO1995006369A1 publication Critical patent/WO1995006369A1/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
    • H04B7/0491—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas using two or more sectors, i.e. sector diversity
    • 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
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W16/00—Network planning, e.g. coverage or traffic planning tools; Network deployment, e.g. resource partitioning or cells structures
    • H04W16/24—Cell structures

Definitions

  • the invention relates to a method for adding traffic capacity of a sectored base station of a cellu ⁇ lar radio system divided into traffic channels on a TDMA principle, the base station comprising at least two transceiver units and at least two antenna means, by which the base station can establish a radio connection with the active radio stations currently located within its predetermined coverage area.
  • the invention also relates to a sectored base station of a cellular radio system, divided on a TDMA principle into a plurality of traffic channel time slots and comprising at least two transceiver units and at least two antenna means, by which the base station can establish a radio connection with active radio stations currently located within its predetermined coverage area.
  • the geographical area covered by the network is divided into smaller coverage areas or cells, each of which has at least one base station.
  • a base station In each cell, a base station has a certain number of frequency channels allocated to it. The size and closeness of cells and the number of frequency channels allocated to them are determined by the need of traffic capacity in the area.
  • the base stations located in the cells are in turn divided into sectors, each sector covering part of the whole coverage area of the base station.
  • the present invention concerns variation in the need of traffic capacity in the different sectors of the sectored base station; the need may vary, e.g. with the time of the day.
  • the number of transceiver or channel units in a cell is determined on the basis of a momentary maximal need of capacity, the number of channel units rises high, whereby the amount and prize of the radio equip ⁇ ment needed at a base station also rise. In order that this might be avoided, it has become necessary to trans ⁇ fer traffic capacity at a base station from one sector to another to cover the momentary capacity need of the sectors.
  • the object of the present invention is to solve the above problems and to provide a method for increas ⁇ ing the traffic capacity of a base station so that the traffic capacity can be flexibly transferred between the sectors of the base station.
  • the method according to the invention is characterized by providing an additional transceiver unit at a base station, the signals supplied by the transmitter of said unit being branched such that they can be transmitted via at least two antenna means located at the base station to the coverage area of the base station.
  • the invention also relates to a base station which is characterized by comprising an additional transceiver unit and a dividing means that receives the signals transmitted by the additional channel unit and further supplies said signals to at least two combining means of the antenna means of the base station, through which combining means the signals are forwarded via at least two antenna means of the base station to the coverage area of the base station.
  • the invention is based on the idea that it is significantly easier to transfer the traffic capacity of an additional channel unit at the base station from one sector to another since the signals transmitted by the additional transceiver or channel unit are simultan ⁇ eously supplied via more than one antenna to more than one sector.
  • the capacity of the additional channel unit can thus be flexibly used by all said sectors since the free time slots of the additional channel unit can be used for transmitting calls in any sector whatsoever without any special connecting and control operations.
  • the capacity of said channel unit can thus be divided between the different sectors as the smallest possible units, i.e. as individual time slots. Further, imple ⁇ mentation of e.g. frequency hopping according to the GSM system is fairly simple.
  • the major advantage of the method and base station according to the present inven ⁇ tion is that the capacity of the base station can be divided between the different sectors very quickly and simply as the smallest possible units, i.e. individual calls. This significantly increases the utilization rate of the capacity of the base station, and control arrangements required by relay and other corresponding connections in known solutions are simultaneously avoided.
  • Another significant advantage of the solution according to the invention is that handover is not necessary when a radio transmitter connected with the additional channel unit moves from one sector to another if the signals transmitted by said additional channel unit are directed to said sectors.
  • Fig. 1 shows a block diagram of an advantageous embodiment of the base station according to the inven ⁇ tion
  • Fig. 2 exemplifies how the capacity of the channel units of the base station according to Fig. 1 divides between the sectors of the base station.
  • the base station shown in Fig. 1 is a base station of a digital cellular radio system divided into traffic channels on a FDMA/TDMA principle, i.e. of e.g. the GSM system.
  • the structure and operation of the GSM system is described in "The GSM System for Mobile Communications", M. Mouly & M-B Pautet, Palaisean, France, 1992, ISBN: 2.9507190-0-7.
  • the geographical area covered by the base station is divided into two sectors. To each sector is directed one antenna 1 and 2, by which the base station can establish a radio connection with the active mobile stations currently located in the sectors.
  • each frequency channel is divided into time slots on a TDMA principle, e.g. into eight time slots, whereby each time slot may be used for transmitting a different traffic or control channel.
  • the base station of Fig. 1 comprises two fixed channel units (transmitter/receiver pair) 6 and 7. The signals trans- mitted by these units are forwarded via combining means 8 and 9 and antennas 1 and 2 to sectors 1 and 2.
  • a base station may naturally have more than one fixed channel unit per each sector, but according to the GSM speci ⁇ fications it must have at least one fixed channel unit per sector (BCCH).
  • BCCH fixed channel unit per sector
  • a passive power divider is here a power divider that need not be controlled separately.
  • the traffic capacity of the additional chan- nel unit 3 of Fig. 1 can thus be transferred from one sector to another with the accuracy of one call just as quickly as if the traffic capacity needed were fixed. If the base station concerned is divided into three sectors and the additional channel unit is to be util- ized in all the sectors, a power divider dividing into three is needed.
  • the channel unit may simultaneously transmit eight calls on one and the same frequency channel such that for each call there is a different time slot in which the channel unit concentrates on that particular call alone.
  • the different time slots of the channel unit may be trans ⁇ mitted on different frequency channels; thus e.g. time hopping used in the GSM system is possible without any special measures.
  • To the base station of Fig. 1 can naturally be connected more than one 'floating' addi ⁇ tional channel unit 3, whereby one power divider is needed for each floating channel unit.
  • the signals transmitted by the channel unit 3 can pass through both the antenna 1 and the antenna 2 to the corresponding sectors of the antennas.
  • the capa ⁇ city of the channel unit can thus be flexibly divided with the accuracy of one call between the sectors con ⁇ cerned without any kind of control signals.
  • the base station control ⁇ ler 5 assigns the traffic channel concerned by selecting one of the free time slots of the channel unit 3, with ⁇ out that it needs to know whether the radio transmitter concerned is located in the sector covered by the antenna 1 or the antenna 2.
  • the whole capacity of the channel unit can thus be concentrated on the sector of the antenna 1 or the antenna 2 or alternatively divided between these sectors with the accuracy of one time slot.
  • the combiners 8 and 9 shown in Fig. 1 are known conventional broadband combiner filters, which may be tuned to the desired frequencies e.g. when the base station is initiated.
  • the tuning of the combiners to the predetermined frequency channels is performed by the base station controller 5, which e.g. in the GSM system receives sector-specific information from the base sta ⁇ tion controller about the frequency channels available.
  • the receival takes place e.g. such that the signals received by antennas 1 and 2 are sup ⁇ plied to a broadband combiner (not shown), in which they are combined.
  • the output of the combiner is branched, and all the receivers of the channel units 3, 6 and 7 are connected thereto. If each channel unit employs only one frequency channel, the base station controller 5 may
  • the receivers of the channel units initiate the receivers of the channel units such that they receive only a predetermined frequency, i.e. the receivers of the channel units collect the data directed to them from the combined signal supplied by the combiner.
  • Fig. 2 exemplifies how the capacity of the channel units 3, 6 and 7 of the base station according to Fig. 1 divides between the sectors 1 and 2 of the base station.
  • the antennas 1 and 2 and the geographical areas or sectors 1 and 2 covered by the base station via the antennas are shown in Fig. 2.
  • the whole capacity of the channel unit 6 is reserved for the sector 1 and correspondingly the whole capacity of the channel unit 7 is reserved for the sector 2.
  • the time slots that are busy at a given moment, i.e. used for trans ⁇ mission of calls, are marked with an asterisk (*). It thus appears from Fig.
  • the other time slots of the channel unit 3 are free at the moment depicted in Fig. 3, in other words, e.g. the first time slot of the channel unit 3 can be assigned for use in either one of the sectors 1 and 2 at any moment.
  • the capacity of the channel unit 3 can thus be flexibly transferred between the sectors 1 and 2 with the accur- acy of one call without any special control measures. Also, no handover is necessary when a mobile radio transmitter moves from the sector 1 to the sector 2 or vice versa.

Abstract

The invention relates to a method for adding traffic capacity of a sectored base station of a cellular radio system divided into traffic channels on a TDMA principle, the base station comprising at least two transceiver units (6, 7) and at least two antenna means (1, 2), by which the base station can establish a radio connection with the active radio stations currently located within its predetermined coverage area. To provide a simple and flexible method for changing the traffic capacity of the sectors of a base station, an additional channel unit (3) is arranged at the base station, the signals supplied by the transmitter of said channel unit being branched such that they can be forwarded via at least two antenna means (1, 2) located at the base station to the coverage area of the base station. The invention also relates to a base station to which the method according to the invention can be applied.

Description

A method for adding capacity of a base station
Field of the Invention
The invention relates to a method for adding traffic capacity of a sectored base station of a cellu¬ lar radio system divided into traffic channels on a TDMA principle, the base station comprising at least two transceiver units and at least two antenna means, by which the base station can establish a radio connection with the active radio stations currently located within its predetermined coverage area. The invention also relates to a sectored base station of a cellular radio system, divided on a TDMA principle into a plurality of traffic channel time slots and comprising at least two transceiver units and at least two antenna means, by which the base station can establish a radio connection with active radio stations currently located within its predetermined coverage area.
Background of the Invention
In cellular type radio phone networks divided into traffic channels on a TDMA principle (Time Division Multiple Access), the geographical area covered by the network is divided into smaller coverage areas or cells, each of which has at least one base station. In each cell, a base station has a certain number of frequency channels allocated to it. The size and closeness of cells and the number of frequency channels allocated to them are determined by the need of traffic capacity in the area. The base stations located in the cells are in turn divided into sectors, each sector covering part of the whole coverage area of the base station. The present invention concerns variation in the need of traffic capacity in the different sectors of the sectored base station; the need may vary, e.g. with the time of the day. If the number of transceiver or channel units in a cell is determined on the basis of a momentary maximal need of capacity, the number of channel units rises high, whereby the amount and prize of the radio equip¬ ment needed at a base station also rise. In order that this might be avoided, it has become necessary to trans¬ fer traffic capacity at a base station from one sector to another to cover the momentary capacity need of the sectors.
In earlier solutions, calls of an adjacent cell have been transmitted by using an antenna directed to the cell. However, this solution does usually not cover the whole coverage area.
Also previously known are solutions in which separate additional channel units are used by relay-type switches, i.e. the capacity of a moveable additional channel unit is transferred from one sector (or cell) to another, such that the antenna connection is changed by relay switches. These additional channel units slow down allocation of transferable capacity. The major drawbacks of the known solutions are thus the delay in the allocation of an additional unit and inflexibility of the addition of capacity caused by relay-type con¬ trol. Division of the capacity of an additional unit for simultaneous use by different sectors has in practice been impossible.
Summary of the Invention
The object of the present invention is to solve the above problems and to provide a method for increas¬ ing the traffic capacity of a base station so that the traffic capacity can be flexibly transferred between the sectors of the base station. The method according to the invention is characterized by providing an additional transceiver unit at a base station, the signals supplied by the transmitter of said unit being branched such that they can be transmitted via at least two antenna means located at the base station to the coverage area of the base station.
The invention also relates to a base station which is characterized by comprising an additional transceiver unit and a dividing means that receives the signals transmitted by the additional channel unit and further supplies said signals to at least two combining means of the antenna means of the base station, through which combining means the signals are forwarded via at least two antenna means of the base station to the coverage area of the base station.
The invention is based on the idea that it is significantly easier to transfer the traffic capacity of an additional channel unit at the base station from one sector to another since the signals transmitted by the additional transceiver or channel unit are simultan¬ eously supplied via more than one antenna to more than one sector. The capacity of the additional channel unit can thus be flexibly used by all said sectors since the free time slots of the additional channel unit can be used for transmitting calls in any sector whatsoever without any special connecting and control operations. The capacity of said channel unit can thus be divided between the different sectors as the smallest possible units, i.e. as individual time slots. Further, imple¬ mentation of e.g. frequency hopping according to the GSM system is fairly simple. Thus the major advantage of the method and base station according to the present inven¬ tion is that the capacity of the base station can be divided between the different sectors very quickly and simply as the smallest possible units, i.e. individual calls. This significantly increases the utilization rate of the capacity of the base station, and control arrangements required by relay and other corresponding connections in known solutions are simultaneously avoided.
Another significant advantage of the solution according to the invention is that handover is not necessary when a radio transmitter connected with the additional channel unit moves from one sector to another if the signals transmitted by said additional channel unit are directed to said sectors.
The advantageous embodiments of the method and base station according to the invention are presented in attached dependent claims 2 and 4 to 6.
Brief Description of the Drawings
One advantageous embodiment of the base station according to the invention is described in the following with reference to the attached drawings, wherein
Fig. 1 shows a block diagram of an advantageous embodiment of the base station according to the inven¬ tion, and Fig. 2 exemplifies how the capacity of the channel units of the base station according to Fig. 1 divides between the sectors of the base station.
Detailed Description
The base station shown in Fig. 1 is a base station of a digital cellular radio system divided into traffic channels on a FDMA/TDMA principle, i.e. of e.g. the GSM system. The structure and operation of the GSM system is described in "The GSM System for Mobile Communications", M. Mouly & M-B Pautet, Palaisean, France, 1992, ISBN: 2.9507190-0-7. The geographical area covered by the base station is divided into two sectors. To each sector is directed one antenna 1 and 2, by which the base station can establish a radio connection with the active mobile stations currently located in the sectors.
As described in detail in the above-mentioned reference, in the GSM system each frequency channel is divided into time slots on a TDMA principle, e.g. into eight time slots, whereby each time slot may be used for transmitting a different traffic or control channel. The base station of Fig. 1 comprises two fixed channel units (transmitter/receiver pair) 6 and 7. The signals trans- mitted by these units are forwarded via combining means 8 and 9 and antennas 1 and 2 to sectors 1 and 2. A base station may naturally have more than one fixed channel unit per each sector, but according to the GSM speci¬ fications it must have at least one fixed channel unit per sector (BCCH). The base station shown in Fig. 1 further comprises an additional channel unit 3, which is of a similar type as the channel units 6 and 7. The signals transmitted by this channel unit are supplied through a passive power divider 4 to combiners 8 and 9 of the antenna means 1 and 2, and from the combiners the signals transmitted by the channel unit 3 are further supplied to the antenna 1 and 2. A passive power divider is here a power divider that need not be controlled separately. The traffic capacity of the additional chan- nel unit 3 of Fig. 1 can thus be transferred from one sector to another with the accuracy of one call just as quickly as if the traffic capacity needed were fixed. If the base station concerned is divided into three sectors and the additional channel unit is to be util- ized in all the sectors, a power divider dividing into three is needed. If all the time slots of the channel unit 3 shown in Fig. 1 are in traffic channel use, the channel unit may simultaneously transmit eight calls on one and the same frequency channel such that for each call there is a different time slot in which the channel unit concentrates on that particular call alone. The different time slots of the channel unit may be trans¬ mitted on different frequency channels; thus e.g. time hopping used in the GSM system is possible without any special measures. To the base station of Fig. 1 can naturally be connected more than one 'floating' addi¬ tional channel unit 3, whereby one power divider is needed for each floating channel unit.
The signals transmitted by the channel unit 3 can pass through both the antenna 1 and the antenna 2 to the corresponding sectors of the antennas. The capa¬ city of the channel unit can thus be flexibly divided with the accuracy of one call between the sectors con¬ cerned without any kind of control signals. When a traf- fie channel is allocated to a radio transmitter located in either one of the sectors, the base station control¬ ler 5 assigns the traffic channel concerned by selecting one of the free time slots of the channel unit 3, with¬ out that it needs to know whether the radio transmitter concerned is located in the sector covered by the antenna 1 or the antenna 2. The whole capacity of the channel unit can thus be concentrated on the sector of the antenna 1 or the antenna 2 or alternatively divided between these sectors with the accuracy of one time slot.
The combiners 8 and 9 shown in Fig. 1 are known conventional broadband combiner filters, which may be tuned to the desired frequencies e.g. when the base station is initiated. The tuning of the combiners to the predetermined frequency channels is performed by the base station controller 5, which e.g. in the GSM system receives sector-specific information from the base sta¬ tion controller about the frequency channels available. In Fig. 1 the receival takes place e.g. such that the signals received by antennas 1 and 2 are sup¬ plied to a broadband combiner (not shown), in which they are combined. The output of the combiner is branched, and all the receivers of the channel units 3, 6 and 7 are connected thereto. If each channel unit employs only one frequency channel, the base station controller 5 may
- in connection with the initiation of the base station
- initiate the receivers of the channel units such that they receive only a predetermined frequency, i.e. the receivers of the channel units collect the data directed to them from the combined signal supplied by the combiner.
Fig. 2 exemplifies how the capacity of the channel units 3, 6 and 7 of the base station according to Fig. 1 divides between the sectors 1 and 2 of the base station. The antennas 1 and 2 and the geographical areas or sectors 1 and 2 covered by the base station via the antennas are shown in Fig. 2. The whole capacity of the channel unit 6 is reserved for the sector 1 and correspondingly the whole capacity of the channel unit 7 is reserved for the sector 2. In Fig. 2 the time slots that are busy at a given moment, i.e. used for trans¬ mission of calls, are marked with an asterisk (*). It thus appears from Fig. 2 that the channel unit 6 trans¬ mits calls to the sector 1 in its first three time slots, that the channel unit 7 transmits calls to the sector 2 in its first two time slots, and that the chan¬ nel unit 3 transmits a call to the sector 1 in time slot 3 and to the sector 2 in time slot 2. The other time slots of the channel unit 3 are free at the moment depicted in Fig. 3, in other words, e.g. the first time slot of the channel unit 3 can be assigned for use in either one of the sectors 1 and 2 at any moment. The capacity of the channel unit 3 can thus be flexibly transferred between the sectors 1 and 2 with the accur- acy of one call without any special control measures. Also, no handover is necessary when a mobile radio transmitter moves from the sector 1 to the sector 2 or vice versa.
The specification and the accompanying figures are to be understood only as illustrating the invention without restricting it. For example, the number of sectors, antennas and channel units at the base station may deviate from the example given above. The embodi¬ ments of the method and base station according to the invention may thus deviate from the above examples within the scope of the attached claims.

Claims

Claims
1. A method for adding traffic capacity of a sectored base station of a cellular radio system divided into traffic channels on a TDMA principle, the base station comprising at least two transceiver units (6,7) and at least two antenna means (1,2), by which the base station can establish a radio connection with the active radio stations currently located within its predeter- mined coverage area, c h a r a c t e r i z e d by providing an additional transceiver unit (3) at a base station, the signals supplied by the trans¬ mitter of said unit being branched such that they can be transmitted via at least two antenna means (1,2) located at the base station to the coverage area of the base station.
2. The method according to claim 1, c h a r ¬ a c t e r i z e d in that the base station is a base station of the GSM system.
3. A sectored base station of a cellular radio system, divided on a TDMA principle into a plurality of traffic channel time slots and comprising at least two transceiver units (6,7) and at least two antenna means (1,2), by which the base station can establish a radio connection with the active radio stations currently located in its predetermined coverage area, c h a r ¬ a c t e r i z e d in that the base station comprises an additional transceiver unit (3), and a dividing means (4) that receives the signals transmitted by the additional channel unit (3) and further supplies said signals to at least two combining means (8,9) of the antenna means (1,2) of the base sta¬ tion, through which combining means the signals are forwarded via at least two antenna means (1,2) of the base station to the coverage area of the base station.
4. The base station according to claim 3, c h a r a c t e r i z e d in that the dividing means (4) is a passive power divider.
5. The base station according to claim 3 or 4, c h a r a c t e r i z e d in that said combining means
(8,9) of the antenna means (1,2) are broadband combiner filters.
6. The base station according to any one of claims 3 to 5, c h a r a c t e r i z e d in that the base station is a base station of the GSM system.
PCT/FI1994/000370 1993-08-24 1994-08-23 A method for adding capacity of a base station WO1995006369A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU75006/94A AU7500694A (en) 1993-08-24 1994-08-23 A method for adding capacity of a base station

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FI933720 1993-08-24
FI933720A FI933720A (en) 1993-08-24 1993-08-24 Procedure to increase the capacity of a base station which is divided into channels according to the TDMA principle, as well as a base station

Publications (1)

Publication Number Publication Date
WO1995006369A1 true WO1995006369A1 (en) 1995-03-02

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Country Status (3)

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FI (1) FI933720A (en)
WO (1) WO1995006369A1 (en)

Cited By (10)

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WO1996038014A1 (en) * 1995-05-24 1996-11-28 Telefonaktiebolaget Lm Ericsson (Publ) Creation of overlapping cells when using multi casing
EP0765095A2 (en) * 1995-09-22 1997-03-26 Siemens Aktiengesellschaft Method for allocating radio resources to different base station transmitting equipment in a radio communication system
EP0830043A1 (en) * 1996-09-17 1998-03-18 Siemens Aktiengesellschaft Base station and method for cell coverage in a mobile cellular radio system
ES2119710A1 (en) * 1996-11-29 1998-10-01 Alsthom Cge Alcatel Radio communication system base station transceiver.
WO1999022543A1 (en) * 1997-10-29 1999-05-06 Radio Design Innovation Tj Ab Arrangement for different frequency planning in a telecommunication system
US6108526A (en) * 1997-05-07 2000-08-22 Lucent Technologies, Inc. Antenna system and method thereof
EP1096817A1 (en) * 1999-10-27 2001-05-02 TELEFONAKTIEBOLAGET L M ERICSSON (publ) Method and devices for the operation of a radio base station in a cellular system
WO2006095233A1 (en) * 2005-03-11 2006-09-14 Nokia Siemens Networks Oy Delay-based cell portion selection
WO2015166305A1 (en) * 2014-04-30 2015-11-05 Telefonaktiebolaget L M Ericsson (Publ) Multi-sector antenna integrated radio unit
US9240813B2 (en) 2012-12-05 2016-01-19 Telefonaktiebolaget L M Ericsson (Publ) Distributed digitally convertible radio (DDCR)

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US4761822A (en) * 1985-08-23 1988-08-02 Libera Developments Ltd. Burst-mode two-way radio communications system
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Cited By (17)

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Publication number Priority date Publication date Assignee Title
WO1996038014A1 (en) * 1995-05-24 1996-11-28 Telefonaktiebolaget Lm Ericsson (Publ) Creation of overlapping cells when using multi casing
US6449482B1 (en) 1995-05-24 2002-09-10 Telefonaktiebolaget Lm Ericsson (Publ) Creation of overlapping cells when using multi casting
EP0765095A2 (en) * 1995-09-22 1997-03-26 Siemens Aktiengesellschaft Method for allocating radio resources to different base station transmitting equipment in a radio communication system
EP0765095A3 (en) * 1995-09-22 1999-07-28 Siemens Aktiengesellschaft Method for allocating radio resources to different base station transmitting equipment in a radio communication system
US6311074B1 (en) 1996-09-17 2001-10-30 Siemens Aktiengesellschaft Base station and method for covering a cell of a cellular mobile radiotelephone system
EP0830043A1 (en) * 1996-09-17 1998-03-18 Siemens Aktiengesellschaft Base station and method for cell coverage in a mobile cellular radio system
WO1998012889A1 (en) * 1996-09-17 1998-03-26 Siemens Aktiengesellschaft Base station and process for powering a cell of a cellular mobile radio system
ES2119710A1 (en) * 1996-11-29 1998-10-01 Alsthom Cge Alcatel Radio communication system base station transceiver.
US6108526A (en) * 1997-05-07 2000-08-22 Lucent Technologies, Inc. Antenna system and method thereof
WO1999022543A1 (en) * 1997-10-29 1999-05-06 Radio Design Innovation Tj Ab Arrangement for different frequency planning in a telecommunication system
EP1096817A1 (en) * 1999-10-27 2001-05-02 TELEFONAKTIEBOLAGET L M ERICSSON (publ) Method and devices for the operation of a radio base station in a cellular system
WO2001031951A1 (en) * 1999-10-27 2001-05-03 Telefonaktiebolaget Lm Ericsson (Publ) Method and devices for the operation of a radio base station in a cellular system
WO2006095233A1 (en) * 2005-03-11 2006-09-14 Nokia Siemens Networks Oy Delay-based cell portion selection
US9240813B2 (en) 2012-12-05 2016-01-19 Telefonaktiebolaget L M Ericsson (Publ) Distributed digitally convertible radio (DDCR)
US10050655B2 (en) 2012-12-05 2018-08-14 Telefonaktiebolaget L M Ericsson (Publ) Distributed digitally convertible radio (DDCR)
WO2015166305A1 (en) * 2014-04-30 2015-11-05 Telefonaktiebolaget L M Ericsson (Publ) Multi-sector antenna integrated radio unit
US9882612B2 (en) 2014-04-30 2018-01-30 Telefonaktiebolaget Lm Ericsson (Publ) Multi-sector antenna integrated radio unit

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