WO1999057832A1 - Method of assignment and transmission of spread signals in direct sequence spread spectrum cdma mobile communication system, mobile communication system, and transmitter, receiver and transmitter/receiver of mobile communication system - Google Patents
Method of assignment and transmission of spread signals in direct sequence spread spectrum cdma mobile communication system, mobile communication system, and transmitter, receiver and transmitter/receiver of mobile communication system Download PDFInfo
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- WO1999057832A1 WO1999057832A1 PCT/JP1999/002370 JP9902370W WO9957832A1 WO 1999057832 A1 WO1999057832 A1 WO 1999057832A1 JP 9902370 W JP9902370 W JP 9902370W WO 9957832 A1 WO9957832 A1 WO 9957832A1
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- spreading code
- base station
- spreading
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04J—MULTIPLEX COMMUNICATION
- H04J13/00—Code division multiplex systems
- H04J13/16—Code allocation
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B2201/00—Indexing scheme relating to details of transmission systems not covered by a single group of H04B3/00 - H04B13/00
- H04B2201/69—Orthogonal indexing scheme relating to spread spectrum techniques in general
- H04B2201/707—Orthogonal indexing scheme relating to spread spectrum techniques in general relating to direct sequence modulation
- H04B2201/70702—Intercell-related aspects
Definitions
- the present invention relates to a spread signal assignment method and a signal transmission method in a direct spread C D MA mobile communication system, a mobile radio communication system using these methods, and a transmitter, a receiver, and a transmission / reception device of the mobile radio communication system.
- the present invention relates to a spread signal allocation method and a signal transmission method in a CDMA (Direct Sequence Code Division Multiple Access) mobile communication system performing multiple access using direct spreading, and mobile radio communication using these methods.
- the present invention relates to a system, and a transmitter, a receiver, and a transmission / reception device of the mobile radio communication system.
- a first spreading code group common to each base station having the same repetition period as the information symbol period (hereinafter, a code having the same repetition period as the information symbol period is referred to as a short code. )
- a second spreading code group having a repetition period longer than the information symbol period (hereinafter, a code having a repetition period longer than the information symbol period is referred to as a long code)
- the first spreading code of the first spreading code group is used.
- the signal is transmitted by being double-spread by the second spreading code of the second spreading code group (the second spreading code is different for each base station). This is because the first spreading code of the first spreading code group is limited, and the second spreading code is used to suppress interference from other base stations.
- Figure 1 shows an example of the configuration of a commonly used direct spreading system.
- information input is first-spread with a first spreading code, and then second-spread with a second spreading code.
- the information input to the input terminal 1 is first-spread by the multiplier 2 by multiplying the output of the first spreading code generator 3 by the multiplier.
- the spread output of the multiplier 2 is given to the multiplier 4 by the By multiplying by the output of the second spreading code generator 5, it is secondarily spread, and a spread modulation output is obtained at the output terminal 6.
- FIG. 2 shows another configuration example. This is a method in which the information input is simultaneously spread with the first spreading code and the second spreading code by outputting the exclusive OR of the first spreading code and the second spreading code.
- the exclusive OR circuit 9 takes the exclusive OR of the output of the first spreading code generator 3 and the output of the second spreading code generator 5, and by this output, the information input to the input terminal 1 is obtained.
- the multiplier 8 the spread is performed, and a spread modulation output is obtained at the output terminal 6.
- an orthogonal code (for example, a GOLD code) is generally used as the first spreading code.
- This orthogonal code is characterized in that only the number of spreading factors can be generated. For this reason, in a general direct spreading CDMA communication system, not only a first spreading code having a repetition period of an information symbol period but also a second spreading code having a repetition period longer than that of an information symbol is used. Is spread and transmitted. The second spreading code having a long repetition period can increase the number of spreading codes by making the repetition period extremely long.
- FIG. 3 shows a configuration example of a receiver in the case where a signal is transmitted after being double-spread by the first spreading code and the second spreading code.
- the signal double-spread by the first spreading code and the second spreading code received by the antenna unit 10 is received by the RF receiving unit 11.
- the received signal is first-order despread by the multiplier 12 by multiplying the output of the second spreading code generator 13.
- the despread output of the multiplier 12 is multiplied by the output of the first spreading code generation unit 15 in the multiplier 14 to perform second-order despreading, and the output is applied to the demodulation unit 16.
- Demodulated data can be obtained from the demodulation unit 16.
- FIG. 4 shows a configuration example of a transmitter when a signal is transmitted after being double-spread by the first spreading code and the second spreading code.
- Data to be transmitted is applied to modulation section 21.
- the output of the modulator 21 is first-spread by the multiplier 22 by multiplying the output of the first spreading code generator 23.
- the multiplier 24 the spread output of the multiplier 22 is multiplied by the output of the second spreading code generator 25, whereby the signal is secondarily spread and applied to the RF transmitter 26.
- the output of RF transmitting section 26 is output from antenna section 20.
- the exclusive OR of the first spreading code and the second spreading code is used. At the output, it can be spread using a single multiplier.
- a mobile station communicates with a telephone terminal or the like on a public network via a wireless base station. Since the wireless circuit is open to the outside, confidential or unauthorized use is likely to occur. Therefore, in order to avoid confidential talk or unauthorized use, there have been various technologies for connecting only to mobile stations and base stations that have a specific relationship.
- a cordless handset and a cordless base unit have a unique system identification number (cordless cordless handset and cordless telephone). It consists of a fixed identification number and a plurality of identification numbers that determine the order of both base units.) By transmitting and receiving, the identification between the cordless base unit and the cordless base unit that can communicate is performed. . Communication is possible only when the system identification numbers in the signals of the cordless slave unit and the codeless master unit match.
- Japanese Patent Application Laid-Open No. Hei 7-230540 discloses an invention related to a business cordless telephone system, and a PBX wireless communication system. It describes a mouthing service for terminals that move between service areas.
- the cordless handset uses a unique system identification number (base station) assigned to each communicable system.
- the base station that can communicate with the cordless handset is identified by transmitting and receiving the ID. In other words, communication is possible between the cordless handset and the base station only when the system identification number or network identification number in the transmitted / received signals matches.
- Figure 5 shows an example of a generalized roaming service between PBXs (private branch exchanges).
- the roaming service is provided by checking the system identification number or the network identification number in the PBX 42 or the mobile terminal device 43. Is determined.
- controlling whether to establish a connection between a radio base station and a mobile station is a pre-processing of communication, and it is necessary to process it as quickly as possible.
- the radio mobile station grasps the spreading code (long code and short code) used by the radio base station, despreads the received signal using the spreading code, and then identifies the system from the information symbol. You will know the number or network identification number. At this time, if the spreading code is not known, it is necessary to identify the spreading code.Therefore, it takes a lot of time for the wireless mobile station to recognize from the received signal whether or not connection with the base station is possible. In short, it is not practical. Disclosure of the invention
- a second spreading code which is a long code that differs for each base station.
- the direct spreading CDMA mobile communication system is applied to a small-scale mobile communication system such as a cordless telephone system, it is not always necessary to use a different second spreading code for each base station.
- the present invention has been made in view of the above-described problem and the knowledge that it is not always necessary to use a different second spreading code for each base station.
- Spread signal allocation method and signal transmission method in direct spread CDMA mobile communication system capable of avoiding interference and enabling roaming service, mobile radio communication system using these methods, and transmitter and receiver of this mobile radio communication system It is intended to provide a transmitter and a transceiver.
- the invention according to claim 1 is a spread code for performing band expansion on a wideband signal, wherein the spread code having a rate higher than the information rate has a repetition period equal to the information symbol period.
- the second spreading code corresponds to a code associated with each base station group or a network type to which the base station group belongs. It is characterized in that assigned codes are assigned.
- the spread code allocating method by assigning a code associated with each base station group or a code associated with each network type to which the base station group belongs as the second spread code, Various services can be provided by the second spreading code.
- a code associated with each network type is assigned, Confirming the two-spread code between the base station and the mobile station enables oral service.
- the codes associated with each base station group or the codes associated with each network type to which the base station group belongs are classified according to carrier, region, building floor, company, special service, etc. By allocating to various services, various services in small area, middle area, wide area, etc., indoor and outdoor doors are possible.
- the invention according to claim 2 is a spread code for performing band expansion on a wideband signal, wherein the spread code having a rate higher than the information rate has a repetition period equal to the information symbol period.
- a first spreading code of the first spreading code group and a second spreading code of the second spreading code group are included in a signal transmission method in a direct spread CDMA mobile communication system for transmitting a signal.
- a code associated with each base station group or a code associated with each network type to which the base station group belongs is assigned as the second spreading code.
- the spreading code itself functions as an identification number, so the cordless handset confirms the identification number of the cordless telephone system after identifying the spreading code for despreading. There is no need to perform this operation, and it is possible to easily identify the cordless parent device with which the cordless child device can communicate. Also, since the second spreading code is different from the base unit of another cordless telephone system, communication is not possible. Therefore, interference from other cordless telephone systems can be avoided.
- the invention according to claim 3 is a spread code for performing band expansion on a wideband signal, wherein the spread code having a rate higher than the information rate has a same repetition period as the information symbol period.
- a base station in a direct spread CDMA mobile communication system is configured to transmit the second spreading code assigned to each base station group or the network type to which the base station group belongs.
- the mobile station in the direct-sequence CDMA mobile communication system having the allocated second spreading code communicates with the base station using the second spreading code allocated to the base station. And performing communication using the distributed signals.
- the invention according to claim 4 is a spread code for expanding a band of a wideband signal, wherein the spread code having a rate higher than the information rate has a first spreading cycle having the same return cycle as the information symbol cycle.
- a code associated with each base station group or a network type to which the base station group belongs is associated as the second spreading code. Communication using a signal spread by the second spreading code assigned to the base station.
- the invention according to claim 5 is a spread code for performing band expansion on a wideband signal, wherein the spread code having a rate higher than the information rate has a repetition period equal to the information symbol period.
- Groups and information thin A second spreading code group having a repetition period longer than the Vol period, and transmitting the signal by doubly spreading with the first spreading code of the first spreading code group and the second spreading code of the second spreading code group.
- a code associated with each base station group or a code associated with each network type to which the base station group belongs is assigned as the second spreading code
- the spreading code having a rate higher than the information rate comprises a first spreading code group having the same repetition period as the information symbol period and a second spreading code group having a repetition period longer than the information symbol period.
- a transmitter, a receiver, and a transmission / reception apparatus in a base station or a mobile terminal device of a direct spread CDMA mobile communication system which are suitable for the method described in claims 1 and 2. can do.
- a second spreading code corresponding to each base station group or a network type to which the base station group belongs is generated.
- a second spreading code control means for performing control is provided.
- An invention according to claim 8 is a receiver for a direct-sequence CDMA mobile communication system according to claim 5, wherein: A second spreading code control means for controlling the generation of the second spreading code corresponding to the network type to which the station group belongs is provided.
- a transmitting / receiving apparatus comprising: a base station; It is characterized in that a second spreading code control means for performing generation control is provided.
- the invention according to claims 7 to 9 is a transmitter, a receiver and a transmission / reception apparatus in a base station or a mobile terminal device of a direct spread CDMA mobile communication system according to claims 4 to 6, wherein each base station group or the base station It specifies that a second spreading code control means for controlling generation of a second spreading code corresponding to the network type to which the group belongs is provided.
- Figure 1 is a diagram (prior art example, part 1) showing an example of the configuration of the direct spreading method that performs double spreading.
- Fig. 2 is a diagram (conventional example, part 2) showing an example of the configuration of the direct spreading method of doubly spreading.
- Fig. 3 is a diagram (conventional example) showing a configuration example of a receiver.
- Fig. 4 is a diagram (conventional example) showing a configuration example of a transmitter.
- Fig. 5 is a diagram (conventional example) showing a configuration example of a PBX front-end service.
- FIG. 6 is a diagram illustrating an example of a correspondence relationship between a base station group number and a second spreading code.
- FIG. 7 is a diagram illustrating an example of a correspondence relationship between a base station group number, a network identification number, and a second spreading code.
- FIG. 8 is a diagram for explaining an example of a system configuration when a base station group number is associated with a second spreading code.
- FIG. 9 is a diagram for explaining an example of a system configuration when a network type is associated with a second spreading code.
- FIG. 10 is a diagram for explaining a method of generating the second spreading code.
- FIG. 6 shows an example of the correspondence between the base station group number and the second spreading code.
- the second spreading code assigned to each base station is assigned to each base station group in the example of FIG.
- a mobile communication system such as a cordless telephone system can be considered.
- the second spreading code is allocated to each cordless telephone system. Therefore, in this case, the cordless base unit of the same cordless telephone system will use the same second spreading code to second spread the transmission signal and transmit it to the cordless handset.
- Fig. 6 shows an example in which a second spreading code is assigned to three cordless telephone systems. That is, the second spreading code 1 0 1 0 1 0 1 0 1 0 1 0 1 0 is assigned to the cordless telephone system 1 1 1, and the second spreading code 0 1 0 1 0 is assigned to the cordless telephone system 2 2 2 1 0 1 0 1 0 1 is assigned, and the second spreading code 0 0 0 0 0 1 1 1 1 1 1 is assigned to the cordless telephone system 3 3 3 3.
- the cordless base station spreads the signal using the second spreading code assigned to the cordless telephone system to which the cordless base station belongs, and transmits the spread signal.
- the cordless base unit of the cordless telephone system having the system identification number 1 1 1 1 outputs the information input to the input terminal 1 to the first spreading code generation unit 3 in the multiplier 2. Is first-order spread by multiplying by the output of.
- the spread output of the multiplier 2 is converted to a second spreading code 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 corresponding to the system identification number assigned to the cordless telephone system to which the multiplier 2 belongs.
- the signal is secondarily spread by the multiplier 4, and a spread modulation output to be transmitted to the cordless handset is obtained at the output terminal 6.
- the cordless handset has the second spreading code assigned to the cordless telephone system to which it belongs as the second spreading code.
- a cordless handset of a cordless telephone system having a system identification number of 111 has a second spreading code of 110101101.
- the cordless parent device and the cordless child device have the second spreading code assigned to the cordless telephone system to which they belong. If the cordless base unit and the cordless slave unit belong to the same cordless telephone system, the second spreading code spread by the cordless base unit and the second spreading code of the receiver are the same, so the signal Can be received. As described above, since the spreading code itself functions as the identification number of the cordless telephone system, the cordless handset does not need to confirm the identification number of the cordless telephone system after identifying the spreading code for despreading. It is possible to easily identify the cordless parent device with which the cordless child device can communicate.
- the second spreading code is different from the base unit of another cordless telephone system, communication is not possible. Therefore, interference from other cordless telephone systems can be avoided.
- FIG. 8 shows an example of a direct spreading CDMA mobile communication system in this case. It is composed of a public network 51, control devices 52, to 52, and base station devices 55 to 60.
- the base station devices 55, 56 constitute a base station group 1 and a base station.
- the station devices 57, 58 constitute base station group 2, and the base station devices 59, 60 constitute base station group n.
- the second spreading code 1 0 1 0 1 0 1 0 1 0 1 0 1 0 (L 1) is assigned to the base station group 1
- the second spreading code 0 1 0 1 0 1 0 is assigned to the base station group 2.
- 1 0 1 0 1 (L 2) is assigned
- the second spreading code 0 0 0 0 0 0 1 1 1 1 (L 3) is assigned to the base station group 3.
- the mobile terminal device having the second spreading code 100 1 0 1 0 1 0 1 0 1 0 1 0 (L 1) assigned to the base station group 1 is different from the base station device in the base station group 1 in the base station device.
- communication cannot be performed via a base station device of another base station group (for example, a base station device belonging to base station group 2 or base station group 3).
- the second spreading codes 1 0 1 0 1 0 1 0 1 0 1 0 1 0 (L 1) and 0 1 0 1 0 1 0 1 0 1 0 1 (L 1) assigned to the base station group 1 and the base station group 2 2) can communicate with the base station apparatuses in the base station group 1 and the base station group 2.
- FIG. 7 shows a method of assigning the second spreading code different from FIG.
- the second spreading code is allocated for each cordless telephone system in the embodiment of FIG. 6, whereas the configuration of FIG. 7 enables the oral communication service.
- a unit that integrates multiple systems is called a “network type.” In other words, each network type includes one or more systems.) ).
- a second spreading code is allocated for each network type. Therefore, in this case, even if the cordless base unit of a different cordless telephone system belongs to the same network type, the signal is secondarily spread and transmitted using the same second spreading code. .
- FIG. 7 shows an example of the correspondence relationship between the system identification number, the network identification number, and the second spreading code.
- the network identification number is an identification number assigned to each network type.
- a second spreading code is assigned to three cordless telephone systems.
- Each cordless telephone system has a network identification number corresponding to the network type, and the cordless telephone system 1 1 1 1 and the cordless telephone system 2 2 2 2 belong to the same network type and have the same Network identification number 1 2 3 4 5 6 7 8
- the telephone system 3 3 3 3 has a network identification number 8766 5 4 3 2 1 alone.
- the second spreading code is provided corresponding to the network identification number.
- the second spreading code 1 0 1 0 1 0 1 0 1 0 10 is assigned to the network identification number 1 2 3 4 5 6 7 8 and the network identification number 8 7 6 5 4 3 2 1 is assigned to The second spreading code 0 0 0 0 0 0 1 1 1 1 1 is assigned.
- the cordless base station spreads the signal using the second spreading code assigned to the network identification number of the cordless telephone system to which the cordless base station belongs.
- the cordless base unit having the system identification number 1 1 1 1 1 outputs the information input to the input terminal 1 to the first spreading code generation unit 3 in the multiplier 2. Is first-order spread by multiplying by the output of.
- the spread output of the multiplier 2 is secondarily spread in the multiplier 4 by the second spreading code 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 0 corresponding to the network identification number, and is output to the output terminal 6. Get the spread modulation output.
- the cordless master unit having the system identification number 2 2 2 2 also multiplies the information input to the input terminal 1 by the multiplier 2 with the output of the first spreading code generation unit 3. First-order diffusion is performed. Next, the spread output of the multiplier 2 is secondarily spread in the multiplier 4 by the second spreading code 1 0 1 0 1 0 1 0 1 0 10 corresponding to the network identification number, and spread-modulated to the output terminal 6. Get output.
- cordless handset Even if the cordless handset moves and moves to another cordless phone system zone, if the destination is the same network identification number as the source cordless phone system, the cordless handset will: Communication can be continued as it is.
- the cordless telephone system 1 1 1 1 1 1 even if the cordless handset of the cordless telephone system 1 1 1 1 1 moves to the zone of the cordless telephone system 2 2 2 2, the network identification number is the same and the cordless base unit Second spreading code Are the same, communication can be continued. However, the cordless telephone system 1 1 1 1 1
- the roaming service can be provided only by assigning the second spreading code in accordance with the network identification number of the cordless telephone system to which it belongs. it can.
- Fig. 9 shows an example of a direct sequence CDMA mobile communication system in this case.
- Public network 5 1 the control unit 5 2, and a ⁇ 5 2 n and the base station apparatus 5 5-6 0.
- Base station devices 5 5 and 5 6 constitute base station group 1
- base station devices 57 and 58 constitute base station group 2
- base station devices 59 and 60 And a base station group n.
- the control devices are interconnected.
- the network type 1 2 3 4 5 6 and the second spreading code L 1 are assigned to the base station group 1, and the network type 1 2 3 is assigned to the base station group 2.
- the mobile terminal device having the second spreading code L1 is a base station device of a base station group having the second spreading code L1 (for example, a base station belonging to base station group 1, base station group 2 or base station group 3). Communication can be performed via the devices 55 to 60).
- the mouth-to-mouth service can also be provided by the cordless handset having a plurality of second spreading codes corresponding to the cordless telephone system to receive the roaming service.
- the cordless handset has a second spreading code of network type 789 0 12 other than network type 1 2 3 4 5 6, the network type 7 89 0 1 2 also communicate with the base station group belonging to Can be
- the code associated with each base station or the code associated with each type of network to which the base station belongs is divided into carriers, regions, building floors, companies, special services, etc. By splitting, various services in small area, medium area, wide area, etc., indoor and outdoor are possible.
- FIG. 10 illustrates a method of generating a second spreading code provided in a base station or a mobile terminal device.
- the base station or the mobile terminal device has initial setting means 70, storage means 71, second spreading code generation control means 72, and second spreading code generating means 73.
- a base station group number to which a base station or a mobile terminal device belongs and a network identification number are registered (70).
- the registered base station group number and network identification number are stored in the storage means 71.
- the second spreading code generation control means 72 extracts parameters related to the generation polynomial, initial value and phase according to the base station group number and the network identification number stored in the storage means 71.
- the second spreading code generation means 73 generates a second spreading code (for example, a PN code) based on the generator polynomial, initial value and phase parameters extracted by the second spreading code generation control means 72 I do.
- the zone configuration of the present invention employs various types including the sector type. Also, the uplink or downlink frequency may be the same or different.
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Description
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Priority Applications (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| EP99918326.2A EP0989696B1 (en) | 1998-05-07 | 1999-05-07 | Method of assignment and transmission of spread signals in direct sequence spread spectrum cdma mobile communication system, mobile communication system, and transmitter, receiver and transmitter/receiver of mobile communication system |
| US09/446,888 US7519102B1 (en) | 1998-05-07 | 1999-05-07 | Method of assignment and transmission of spread signals in direct sequence spread spectrum CDMA mobile communication system, mobile communication system, and transmitter, receiver and transmitter/receiver of mobile communication system |
| JP55520699A JP3233947B2 (ja) | 1998-05-07 | 1999-05-07 | 直接拡散cdma移動通信システムにおける拡散信号割当て方法及び信号伝送方法、これらの方法を用いる移動無線通信システム、並びにこの移動無線通信システムの送信機、受信機及び送受信装置 |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP10/124748 | 1998-05-07 | ||
| JP12474898 | 1998-05-07 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| WO1999057832A1 true WO1999057832A1 (en) | 1999-11-11 |
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ID=14893145
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| PCT/JP1999/002370 Ceased WO1999057832A1 (en) | 1998-05-07 | 1999-05-07 | Method of assignment and transmission of spread signals in direct sequence spread spectrum cdma mobile communication system, mobile communication system, and transmitter, receiver and transmitter/receiver of mobile communication system |
Country Status (5)
| Country | Link |
|---|---|
| US (1) | US7519102B1 (ja) |
| EP (1) | EP0989696B1 (ja) |
| JP (1) | JP3233947B2 (ja) |
| CN (1) | CN1118977C (ja) |
| WO (1) | WO1999057832A1 (ja) |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| RU2298876C2 (ru) * | 2001-11-15 | 2007-05-10 | Нокиа Корпорейшн | Способ компактного представления сигнализации о мультикодах в системах связи |
| US7310064B2 (en) * | 2004-04-29 | 2007-12-18 | Novariant Inc. | Rebroadcasting method and system for navigation signals |
| US8005153B2 (en) * | 2006-01-25 | 2011-08-23 | Texas Instruments Incorporated | Method and apparatus for increasing the number of orthogonal signals using block spreading |
| US7817574B2 (en) * | 2006-10-19 | 2010-10-19 | Motorola Mobility, Inc. | Inter-packet-node paging between communication networks |
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| JP3793632B2 (ja) * | 1997-12-18 | 2006-07-05 | 松下電器産業株式会社 | セルサーチ方法及び移動局装置 |
| US6188767B1 (en) * | 1998-04-29 | 2001-02-13 | Motorola, Inc. | Method of providing group call services in a CDMA communications system |
| US6526035B1 (en) * | 1998-06-09 | 2003-02-25 | Telefonaktiebolaget Lm Ericsson (Publ) | Method and apparatus for identifying the source of a digital signal |
-
1999
- 1999-05-07 CN CN99800643A patent/CN1118977C/zh not_active Expired - Lifetime
- 1999-05-07 US US09/446,888 patent/US7519102B1/en not_active Expired - Fee Related
- 1999-05-07 JP JP55520699A patent/JP3233947B2/ja not_active Expired - Lifetime
- 1999-05-07 WO PCT/JP1999/002370 patent/WO1999057832A1/ja not_active Ceased
- 1999-05-07 EP EP99918326.2A patent/EP0989696B1/en not_active Expired - Lifetime
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH06501349A (ja) * | 1990-06-25 | 1994-02-10 | クアルコム・インコーポレーテッド | Cdmaセルラ電話の信号波形発生のためのシステムおよび方法 |
| JPH05130070A (ja) * | 1991-10-31 | 1993-05-25 | Masao Nakagawa | スペクトラム拡散通信システム |
| JPH1056439A (ja) * | 1996-08-08 | 1998-02-24 | Kokusai Electric Co Ltd | Cdma受信回路 |
Also Published As
| Publication number | Publication date |
|---|---|
| JP3233947B2 (ja) | 2001-12-04 |
| EP0989696B1 (en) | 2014-08-20 |
| CN1118977C (zh) | 2003-08-20 |
| EP0989696A1 (en) | 2000-03-29 |
| US7519102B1 (en) | 2009-04-14 |
| CN1266570A (zh) | 2000-09-13 |
| EP0989696A4 (en) | 2004-07-28 |
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