`
`PCT
`
`WORLD INTELLECTUAL PROPERTY ORGANIZATION
`
`International Bureau
`
`INTERNATIONAL APPLICATION PUBLISHED UNDER THE PATENT COOPERATION TREATY (PCT)
`
`
`W0 89/ 08355 (51) International Patent Classification 4 :
`(11) International Publication Number:
`
`H04B 7/26, H04H 3/00
`(43) International Publication Date: 8 September I989 (O8.09.89)
`
`
`
`(81) Designated States: AU, DK, FI, JP, NO.
`
`(21) International Application Number:
`PCT/SE89/00049
`
`
`3 February 1989 (os.o2.s9)
` (22) International Filing Date: Published
`
`With international search report.
`
`(31) Priority Application Number:
`8800698-6
`(32) Priority Date:
`29 February 1988 (29.02.88)
`
`SE
`(33) Priority Country:
`
`
`icant: TELEFONAKTIEBOLAGET LM ERICS-
`N [SE/SE]: S-126 25 Stockholm (SE).
`
`(72) Inventors: RAITH, Alex, Krister ; Sorogatan 19, S-164
`41 Kista (SE). UDDENFELDT, Jan, Erik ; Back-
`timjegrand 19, S-162 41 Vallingby (SE).
`
`
`
`(74) Agents: LOVGREN, Tage et a1.; Telefonaktiebolaget
`LM Ericsson, S-126 25 Stockholm (SE).
`
`
`
`P5
`
`(71) A pl
`0
`
`
`
`
`(54) Title: CELLULAR DIGITAL MOBILE RADIO SYSTEM WITH PLURAL BASE STATION TRANSMITTERS -
`AND METHOD OF TRANSMITTING INFORMATION IN SUCH A SYSTEM
`7
`
`
`
`
`
`.
`
`(57) Abstract
` The invention relates to a cellular digital mobile radio sys-
`
`
`tem including base stations (Bm, B") and mobile stations (MS,,
`MS3) with transmitters and receivers. The invention also relates
`to a method of transmitting message information digitally be-
`tween mobile and base stations in such a system. In accordance
`with the invention, at least two base station transmitters (Em,
`
`Bm, BM, Bub) at a given transmitting distance from each other
`
`are assigned to each of certain cells (Cm, Cn) within a restricted
`
`geographical area. The base station transmitters which are as-
`
`signed to the same cell transmit digitally modulated radio sig-
`
`nals within the same frequency range at least partially simul-
`
`taneously to the mobile stations of the cell. The radio signals
`
`from different base station transmitters associated with the same
`
`cell are digitally modulated with the same message information
`
`to the mobile stations in the cell. Different base station transmit-
`ters (9A, 9B) preferably transmit the digitally modulated radio
`
`signals with the same message information to a given mobile sta-
`
`tion with a given mutual transmission time shift. Here, the trans-
`
`mission time shift is selected individually for each mobile sta-
`
`tion, such that corresponding digitally modulated radio signals
`
`with the same message information to a given mobile station
`
`from different base station transmitters arrive practically simul-
`
`taneously at the mobile station.
`
`.1
`
`
`
`f
`Find authenticated court documents without watermarks at docketalarm.com.
`
`Petitioners, Ex. 1014, Page 1
`
`
`
`Petitioners, Ex. 1014, Page 1
`
`Juniper Ex 1010-p. 1
`Juniper v MTel891
`
`

`

`
`
`FOR IHE PURPOSES OF HVFORMAHON ONLY
`
`Codes used to identify States party to thel’CT onthe front pages ofpamphlets pubfishing internationalappli-
`cations under the PCT.
`
`AT Austria
`AU Australia
`BB Barbados
`BE Belgium
`BG Bulgaria
`BJ
`Benin
`BR Brazil
`CF Central African Republic
`CG Congo
`CH Switzerland —
`CM Cameroon
`DE Germany, Federal Republic of
`DK Denmark
`FI
`Finland
`
`,
`
`France
`Gabon
`United Kingdom
`Hungary
`Italy
`Japan
`Democratic People’s Republic
`of Korea
`Republic ofKorea
`Liechtenstein
`Sti Lenka
`Luxembourg
`Monaco
`Madagascar
`
`ML Mali
`MR Mauritania
`MW Malawi
`NL Netherlands
`NO Norway
`R0 Romania
`SD Sudan
`SE
`Sweden
`SN Senegal
`SU Soviet Union
`TD Cliad
`TG Togo
`US United States of Americ_a.
`
`f
`Find authenticated court documents without watermarks at docketalarm.com.
`
`Petitioners, Ex. 1014, Page 2
`
`Juniper Ex 1010-p. 2
`Juniper v MTel891
`
`

`

`
`
`wo 89/08355
`
`PCT/SE89/00049
`
`1
`
`Cellular digital mobile radio system with plural
`base station transmitters and method of transmitting
`information in such a system
`
`TECHNICAL FIELD
`
`The present
`
`invention relates to mobile radio systems. More specifically the
`
`invention relates to a digital, cellular, mobile radio system. The invention also
`
`relates to a method of transmitting information digitally to and from mobile
`
`stations in a cellular mobile radio system.
`
`BACKGROUND ART
`
`The mobile radio systems that were first
`
`taken into common use were of
`
`analogue type,
`
`i.e. message information was transmitted in analogue form to
`
`and from mobile stations by transmitting and receiving analouge-modulated
`radio signals. In such systems it
`is known to have two or more base station
`
`transmitters at a distance from each other simultaneously transmitting radio
`
`signals within the same frequency range-and modulated with the same message
`
`information to the mobile stations. Such mobile radio systems are described in
`
`EP 0040731 and EP 0072479, as well as in the two publications: NTG-
`
`Fachberichte, Bewegliche Funkdienste, Vortréige der NTG-Fachtagung vorn 25.
`
`bis 27 November in Munich, "GLEICHKANALFUNKSYSTEME FUR DIE FRE-
`
`QUENZUKONISCHE VERSORGUNG GROSSER GEBIETE" Berndt Heynisch pp
`
`41-46, VDE-VERLAG GmbH, Berlin, Elektrizitéitswirtschaft, Jg. 8D(l98l), Heft
`6, pp 187-198 "C~)uasissynch1-oner Gleichwellenfunk-ein Gleichkanalfunk-Ver-
`fahren zur Erhbhung der Erreichbarkeit in Mobilfunknetzen.
`
`In known systems of the kind in question here, it is known to transmit message
`
`information from a central station or exchange to the base station transmitters
`
`either via cables or radio signals. It is also known to have equalisers in the fixed
`
`part of the mobile radio system for equalising differences in propagation time
`
`and attenuation in transmission from the exchange to the base station trans-
`
`rnitters. The equalisers can be at
`
`the exchange and/or at
`
`the base station
`
`transmitters. The object of the equalisers is
`
`that irrespective of position in
`
`relation to the exchange the base station transmitters shall transmit the radio
`
`signals simultaneously, and modulated with the same message information.
`
`f
`Find authenticated court documents without watermarks at docketalarm.com.
`
`Petitioners, Ex. 1014, Page 3
`
`Juniper Ex 1010-p. 3
`Juniper v MTel891
`
`

`

`wo 89/08355
`
`
`
`2
`
`PCVSE39/°“°"9°
`
`Digital mobile radio systems in which message information is 5transmitted.
`
`digitally to and from mobile stations by transmission and reception of digitally 9
`
`modulatedr signals have been proposed in US 4675863 and "Digital Mobile
`
`Telephone System Using TD/FDMA Scheme", Kota Kinoshita, Masaharu Hata
`
`and Kenkichi Hirade, IEEE TRANSACTIONS ON VEHICULAR TECHNOLOGY,
`
`VOL. VT’-31, NO.4, NOVEMBER 1982, pp 153-157.
`
`It has been proposed to have adaptive equalisers in mobile radio stations in
`
`digital radio systems, whereby multi-path propagation of radio signals can be
`
`used to improve signal quality, instead of the multipath propagation acting as
`
`noise. Among the publications on adaptive equalisers in digital mobile radio
`
`systems can be mentioned: "Multi—path Equalization for Digital Cellular Radio
`
`Operation at 300 k. bit/s". K Raith, J~E Sjternvall and J Uddenfeldt, 36th IEEE
`
`Vehicular Technology Conference, pp 268-272, Dallas, Texas, USA May 1986.
`
`"Radio Test Performance of a Narrowband TDMA System", J-E Stjernvall, B.
`
`Hedberg, and S Ekmark, IEEE Vehicular Conference, Tampa, Florida, USA, June
`
`1987, RADIO TEST PERFORMANCE OF A NARROWBAND TDMA SYSTEM-
`
`DMS 90, .]-E Stjervall, B. Hedberg, K Raith, T Béickstrbm and R Lofdahl.
`
`DISCLOSURE OF INVENTION
`
`In mobile radio systems there are problems due to reflections and radio shadows
`
`from natural obstacles such as rocks and hills, as well as structures such as
`
`buildings. These problems are especially troublesome in transmitting informa-
`
`tion requiring great accessibility/reliability and high transmission speed.
`
`In
`
`particular the problems may become large in certain urban environments where
`
`the propagation conditions for radio signals can vary heavily within a small
`
`geographic area, while radio traffic is intensive at the same time. Up to now
`
`attempts have been made to solve these problems by having adaptive equalisers
`
`in the mobile stations and small cells with specially selected positioning of the
`
`base station transmitters. In areas with much traffic it is, however, a desire to
`
`be able to select the size of the cells and their positions in the mobile radio
`
`system cell plan in an optimum way with respect
`
`to the traffic handling
`
`capacity of the system. Reducing the cell size and selecting the positions of the
`
`small cells to avoid radio shadows thus involves a complication. Another
`
`complication resulting from the reduction of cell size to below what
`
`is
`
`necessary for reasons of capacity is that the number of handovers increases.
`
`f
`Find authenticated court documents without watermarks at docketalarm.com.
`
`Petitioners, Ex. 1014, Page 4
`
`Juniper Ex 1010-p. 4
`Juniper v MTel891
`
`

`

`
`
`WO 89/08355
`
`PCT/SE89/00049
`
`3
`
`The object of the invention is to solve the above-mentioned problems and
`
`complications, and to provide a method and a cellular digital mobile radio
`
`system which are also suitable for transmitting information requiring great
`
`accessibility/reliability and high transmission speed.
`
`What is distinguishing for a method and a digital cellular mobile radio system in
`
`accordance with the invention, and particularly preferred embodiments thereof
`
`is disclosed in the independent and dependent claims. Somewhat simplified, it
`
`may be said that according to the invention there are utilised at least two base
`
`station transmitters for each of a plurality of cells, these transmitters being at
`
`a distance from each other and at least partially simultaneously transmitting
`
`radio signals within the same frequency range digitally modulated with the
`
`same message information to the mobile stations in the cell. The digital
`
`modulation is changed with a modulation time interval which is adapted to the
`
`greatest transmitting distance between two base station transmitters serving
`
`the same cell
`
`in an area. The mobile stations have adaptive equalizers for
`
`reconstructing the digital modulation in the transmitted signals from the signals
`
`received during a reception time interval, which is also adapted to the greatest
`
`transmitting distance between two base station transmitters serving the same
`cell in an area.
`
`In a preferred embodiment of a method in accordance with the invention, the
`
`digitally modulated signals are transmitted with the same message information
`
`to a given mobile station with a given, mutual transmission time shift from the
`different base stations. The transmission shift
`is then selected such that
`it
`
`counteracts the difference in arrival time for the signals from the different
`
`base station transmitters to this mobile station.
`
`In each mobile station,
`
`there is preferably estimated the arrival timezshift
`
`between the digitally modulated radio signals with the same message informa-
`
`tion from'
`
`the different base station transmitters.
`
`Information about
`
`the
`
`estimated arrival time shift at the respective mobile station is transmitted
`from there to at least one base station transmitter. This estimated arrival time
`
`shift is utilised at the base station for selecting the transmission time shift for
`at least one base station transmitter. A transmission time shift is thus obtained
`
`individually for each affected mobile station, and which is adjusted for this
`
`f
`Find authenticated court documents without watermarks at docketalarm.com.
`
`Petitioners, Ex. 1014, Page 5
`
`Juniper Ex 1010-p. 5
`Juniper v MTel891
`
`

`

`A
`
`particular mobile stations's position in relation to the base station transmitters:
`
`The amount of tranmissions time shift can thus vary from mobile stat~ion:toE”
`mobile station.
`
`According a somewhat different, preferred embodiment, there is estimated in
`
`different base station receivers the reception time shift between corresponding
`
`radio signals with the same message information from the mobile station. This
`
`estimated reception time shift is utilised for selecting the transmission time
`
`shift between corresponding base station transmitters. A transmission time
`
`shift can thus be individually obtained for each affected mobile station such
`
`that it is adjusted to the position of this particular mobile station in relation to
`the base station transmitters. The amount of transmission time shift can thus
`
`vary from mobile station to mobile station.
`
`A preferred embodiment of a mobile radio system in accordance with the
`
`invention has time measurement means for estimating the mutual reception
`
`time shift in a mobile statioin between, on one hand, digitally modulated radio
`
`signals transmitted to the mobile station via a base station transmitter for the
`
`cell where this mobile station is, and, on the other hand, corresponding digitally
`
`modulated signals transmitted to this station via another base station trans-
`
`mitter for the cell.
`
`In this embodiment
`
`the mobile radio system has trans-
`
`mission time shifting means for mutually time shifting the transmission times
`
`for base station transmitters of the same call so that they transmit correspon-
`
`ding digitally modulated signals to the mobile station with greater or less
`
`mutual transmission time shifting in response to estimated reception time shift.
`
`The time measurement means preferably include arrival time comparison means
`
`in at
`
`least certain mobile stations,
`
`for comparing the arrival
`
`times for
`
`corresponding digitally modulated signals transmitted from different base-
`station transmitters for the same cell.
`
`According to a somewhat different, preferred emdiment, the time measurement
`
`means include arrival time comparison means in the stationary part of the
`
`mobile radio system, for comparing the arrival times of digitally modulated
`
`signals transmitted from a mobile station in a cell and received at different
`base station transceivers of the cell.
`
`Petitioners, Ex. 1014, Page 6
`
`Juniper Ex 1010-p. 6
`Juniper v MTel891
`
`

`

`WO 89/08355
`
`PCT[SE89/00049
`
`5
`
`A method and as cellular digital mobile radio system in accordance with the
`
`invention provide substantial advantages. The coverage degree can be made
`
`greater, signifying better opportunities for establishing new connections and
`
`maintaining those already established. The coverage degree can be made
`
`greater without the cell size needing to be reduced, which give greater freedom
`
`in the selection of cell plan and a lesser number of handovers. In preferred
`
`embodiments, the transmission time shift, which is individually selectable for
`
`each mobile station, reduces the risk of noise and interruption of calls in
`
`progress, when a mobile station goes from receiving signals chiefly from one
`
`base station transmitter to receiving signals chiefly from another base station
`
`transmitter. when a mobile station simultaneously receives signals from at
`
`least two base station transmitters of the same cell, the variable transmission
`
`time shift enables the received signals together to be more like the signals
`
`obtained from a single base station transmitter in conjunction with reflections.
`
`BRIEF DESCRIPTION OF DRAWINGS
`
`Figure 1 illustrates cells and positioning of transmitters in base stations in one
`
`embodiment of a mobile radio system in accordance with the invention.
`
`Figure 2 illustrates parts of a mobile radio system in accordance with the
`invention.
`
`BEST MODES FOR CARRYING OUT THE INVENTION
`
`A cellular mobile radio system in accordance with the invention has mobile
`
`stations and base stations with transmitters and receivers for radio signals.
`
`Message information is transmitted digitally to and from the mobile stations by
`
`transmission and reception of signals digitally modulated in correspondence
`
`with the message information. The radio signals are transmitted on one of a
`
`plurality of radio channels. Signals can be transmitted in time multiple to and
`from several mobile stations on the same radio channel.
`
`The mobile stations move within and between the cells of the system. The base
`
`station transmitters are assigned to the cells so that there is at least one base
`
`station transmitter for each cell, for transmitting signals to the cell's mobile
`stations.
`
`Petitioners, Ex. 1014, Page 7
`
`Juniper Ex 1010-p. 7
`Juniper v MTel891
`
`

`

`W0 89]08355
`
`PCT/SE89[00049i -
`
`6
`
`Somewhat simplified, there is illustrated in Figure 1 the division of an area into,
`
`cells and the assignation of base station transmitters to the cells inia‘ mobile
`
`telephone system in accordance with the invention. For the sake of simplicity in
`
`Figure 1, all cells CI to C24 are illustrated as regularrhexagones with sides‘ L.
`
`In practice, the cells will probably have different sizes and shapes. In addition,
`
`depending on service conditions, it will often be suitable with overlapping in the
`
`boundary areas between the cells. To a certain extent,
`
`the base station
`
`transmitter can then off—load each other by handling transmission to mobile
`
`stations where such transmission should from a purely geographically point" of
`
`view be performed by the base stations of a contiguous cell.
`
`For each cell Cl-C24 there is an ordinary base station transmitter BS1-B524.
`
`For contiguous cells these transmitters are conventionally colocated in groups
`
`of three. For example, the base station transmitter BS1 for the cell C1 is co-
`located with the base station transmitter BS3 for the cell C3 and the base
`
`the base station
`the cell C5. Correspondingly,
`station transmitter BS5 for
`transmitter B514 for the cell C14 is co-located with the base station trans-
`
`mitter BS16 for the cell C16 and with the base station transmitter B518 for the
`
`cell C18. These co-positioned ordinary base station transmitters are situated in
`
`the boundary areas between the cells to which they are assigned. For example,
`
`the ordinary base station transmitters B52, B54 and B56 are co-located in the
`
`boundary areas between the cells C2, C4 and C6.
`
`Further to the ordinary base station transmitters BS1-BS2-4 the system includes
`
`a number of extra base station transmitters for certain of the cells. Cells C6,
`
`C7, C10, C11, C13, C14, C19 and C20 each has one extra base station
`
`transmitter. For each of the cells C15, C18 and C22 there are two extra base
`
`station transmitters. The extra base station transmitters X56, X57, X510, X511,
`
`X513, XSl5A, XS15B, XS18A, XSl8B, X519, X520 and XS22A are co-located in
`
`groups with three extra base station transmitters in each group in a similar
`
`manner as the ordinary base station transmitters. Accordingly, for example, the
`
`extra base station transmitter XS18B for the cell C15 is co-located with the
`
`extra base station transmitter X519 for the cell C19 and the extra base station
`
`transmitter XS1BA for the cell C18. On the other hand, neither the extra base
`station transmitter X514 for the cell C14 nor the extra base station transmitter
`
`XSZZB for the cell C22 are co-located with any other base station transmitter,
`
`Petitioners, Ex. 1014, Page 8
`
`Juniper Ex 1010-p. 8
`Juniper v MTel891
`
`

`

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`Juniper v MTel891
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