WO2001095524A1 - Systeme de radiocommunication et appareil terminal de communication utilise dans ce systeme - Google Patents
Systeme de radiocommunication et appareil terminal de communication utilise dans ce systeme Download PDFInfo
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- WO2001095524A1 WO2001095524A1 PCT/JP2001/004651 JP0104651W WO0195524A1 WO 2001095524 A1 WO2001095524 A1 WO 2001095524A1 JP 0104651 W JP0104651 W JP 0104651W WO 0195524 A1 WO0195524 A1 WO 0195524A1
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- cdma
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- connection
- fdd
- base station
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Classifications
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W48/00—Access restriction; Network selection; Access point selection
- H04W48/18—Selecting a network or a communication service
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/24—Radio transmission systems, i.e. using radiation field for communication between two or more posts
- H04B7/26—Radio transmission systems, i.e. using radiation field for communication between two or more posts at least one of which is mobile
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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
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/24—Radio transmission systems, i.e. using radiation field for communication between two or more posts
- H04B7/26—Radio transmission systems, i.e. using radiation field for communication between two or more posts at least one of which is mobile
- H04B7/2618—Radio transmission systems, i.e. using radiation field for communication between two or more posts at least one of which is mobile using hybrid code-time division multiple access [CDMA-TDMA]
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W40/00—Communication routing or communication path finding
- H04W40/02—Communication route or path selection, e.g. power-based or shortest path routing
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W80/00—Wireless network protocols or protocol adaptations to wireless operation
Definitions
- the present invention relates to a communication terminal device used in a digital wireless communication system.
- Background technique fe fe
- HDR High Data Rate
- This system uses the same bandwidth (1.25 MHz) for both the uplink and downlink, and the conventional code division multiple access (CDMA) system called IS-95.
- CDMA code division multiple access
- This HDR system is separated by frequency from the IS-95 system that stores voice and low-speed packets in the wireless section, and is also separated from the IS-95 system in the backbone (infrastructure) to specialize in one-night network access. Is being converted.
- the HDR system employs a wireless transmission system that does not perform transmission power control, and always transmits at the maximum power to support high-speed packet transmission in the same coverage area as IS-95, which provides low-rate voice services.
- IS-95 voice service: The cell and antenna are shared for f1
- HDR system high-speed packet transmission service: f2).
- a high-speed packet Since a high-speed packet has a high symbol rate, the required transmission power is larger than that of a low-rate channel. Therefore, maintaining a high-speed packet line up to the edge of the coverage area requires a considerable transmission power. As a result, a high-speed packet channel causes significant interference with other channels, which results in a reduction in system capacity.
- the HDR system always transmits at the maximum power, and changes the allocation time and transmission rate according to the line conditions. That is, as shown in FIG. 2, transmission is performed with the same maximum power to each user, but the allocation time and transmission rate are changed according to the line status of each user. In this way, in the HDR system, the transmission rate (average throughput) is dropped at the edge of the cover area to maintain the line.
- An object of the present invention is to prevent a transmission rate (throughput) from decreasing at a coverage area in a system including a line having a high transmission rate, and increase a frequency use efficiency without lowering an average throughput.
- An object of the present invention is to provide a wireless communication system capable of increasing the number of accommodated channels and a communication terminal device used for the wireless communication system.
- the radio access schemes are both FDD schemes, and have symmetrical characteristics in the time domain and frequency bandwidth in the uplink and downlink.
- a pair of frequency bands (pair bands) is secured for the uplink and downlink.
- FDD system # 1 (for example, IS-95 system) secures uplink frequency band 101 and downlink frequency band 103 in pairs
- FDD system # 2 (for example, HDR system) Band 102 and downlink frequency band 104 are secured in pairs. Note that frequency bandwidths 1 and 2 are the same for uplink and downlink.
- HDR systems have symmetry in terms of the time domain and frequency bandwidth of the uplink and downlink: Even for the FDD scheme, the modulation scheme, frame configuration, channel configuration, channel multiplexing method, etc. of the uplink and downlink are different. By changing to this method, transmission at a higher rate is possible, and asymmetric transmission of the uplink and downlink is realized.
- the FMT (Frequency Division Duplex) system and TJDi (Time Division Duplex) system of W-CDMA (ideband-Code Division Multiple Access), which are currently being standardized as IMT-2000 system, are basically The study is conducted on the assumption that the same service can be provided to each other. One is a system that can provide the services required in 2000. In this case, there is no significant difference in the services provided between the two systems, so the problem is how to operate both systems efficiently if the same operator builds both systems. is there.
- the frequency band for IMT-2000 set by the ITU there is a frequency band (2010-2025MHz) for which it is difficult to secure a pair band as an FDD system. Construction of a system to share and supplement traffic is being considered. This will enable efficient use of the frequency band for the IMT-2000 and efficient operation of both the FDD system and the TDD system.
- the TDD system is ping-pong transmission that uses the same frequency band for the uplink and downlink. In this TDD system, although the same frequency bandwidth is used, asymmetric transmission in the time domain alone can be easily realized by making the time ratio (number of slots) of the upper and lower lines asymmetric.
- downlink signals are assigned to all users (users # 1 to) in downlink frame 108
- downlink slot 109 and uplink slot 110 are time-multiplexed in the same frequency band, and all users (user # 1) are assigned to downlink slot 109.
- FIG. 5 is used to explain the symmetry / asymmetry in the time domain of the upper and lower lines.
- Figure 5 Here, as an example, a case is shown where the multiplexing method between users is time multiplexing, but the multiplexing method between users on one of the upper and lower lines may be time multiplexing or code multiplexing.
- the present inventor has paid attention to the above points, and has focused on the TDD system for high-speed packet transmission, as opposed to the W-CDMA FDD system and TDD system, which have been standardized on the assumption that the same service can be provided.
- the transmission rate slope rate
- the gist of the present invention is that, in a wireless communication system having a plurality of systems including a CDMA-FDD system and a CDMA-TDD system, one of the CDMA-FDD system and the CDMA-TDD system transmits at a transmission rate.
- the mobile station selects a system that desires a desired connection from the CDMA-FDD system and the CDMA-TDD system, and communicates with the selected system.
- Figure 1 is a diagram for explaining the coverage area of the base station
- FIG. 2 is a diagram for explaining user assignment in an HDR system
- FIG. 3 is a diagram showing a frequency band when an FDD system is used
- Figure 4 shows the frequency bands when using the FDD system and the TDD system
- FIG. 5A is a diagram showing a frame configuration of a downlink signal of the FDD system
- FIG. 5B is a diagram showing a frame configuration of an uplink signal and a downlink signal of the TDD system
- FIG. 6 is a diagram showing a schematic configuration in a wireless communication system according to Embodiment 1 of the present invention
- FIG. 7 is a block diagram showing a configuration of a communication terminal device in the wireless communication system according to Embodiment 1 of the present invention.
- FIG. 8 is a diagram showing another example of a schematic configuration in the wireless communication system according to Embodiment 1 of the present invention.
- FIG. 9 is a block diagram showing a configuration of a base station device in the wireless communication system according to Embodiment 2 of the present invention.
- the FDD system when both the FDD system and the TDD system are used, as shown in Fig. 4,:
- a pair of frequency bands (pair bands) is secured in the uplink and the downlink.
- a common frequency band is reserved for the uplink and downlink. That is, the FDD system # 3 secures the uplink frequency band 105 and the downlink frequency band 106 in pairs, and the TDD system # 4 secures the uplink and downlink frequency bands 107.
- the FDD system and the TDD system may each have a plurality of frequency bands.
- a high-speed packet transmission service is accommodated in a TDD system that realizes asymmetric transmission by making the slot length of the downlink and the uplink longer than the slot length of the downlink, and the voice service or the low-speed packet (high-speed packet) is accommodated in the FDD system.
- the following describes a case in which the TDD system uses frequency f2 and the FDD system uses frequency: fl, f3 (pair band).
- the high-speed packet means a “packet for high-speed transmission” or a “packet with a high transmission rate”. That is, in the present embodiment, “a system including a channel with a high wireless transmission rate” is accommodated in the TDD system.
- a system including a channel with a high transmission rate on the radio refers mainly to a system composed of only channels with a high transmission rate on the radio or a channel with a high transmission rate on the radio. This means a system that transmits a huge amount of data, such as images and music, at high speed, as well as a small amount of data like voice, but instantaneously (short transmission time) in a high-speed packet. This includes transmission systems.
- FIG. 6 is a diagram showing a schematic configuration in the wireless communication system according to Embodiment 1 of the present invention.
- an audio signal of frequency: 1 transmitted from mobile station (MS) 201 which is a communication terminal, is received by base station (BS) 202 and obtained by performing predetermined processing.
- the received data is transmitted to a mobile switching center (hereinafter abbreviated as MSC (Mobile Switching Center)) 204 via a radio network controller (hereinafter abbreviated as RNC (Radio Network Controller)) 203.
- MSC Mobile Switching Center
- RNC Radio Network Controller
- data from several base stations are bundled and sent to the telephone network 207. It is also connected to the MSC 204 and the IP knot network 208, and if necessary, generally transmits an IP packet signal using a tunneling technique as described later.
- the telephone network 207 includes PSTN, ISDN and the like.
- the high-speed bucket of the frequency f2 transmitted from the mobile station (MS) 201 is received by the base station (BS) 205, and the received data obtained by performing a predetermined process is routed by the all-in-one switch 206. Is sent to the IP (internal network protocol) network 208.
- IP internal network protocol
- one system is connected from the RNC 203 to the telephone network via the MSC 204, and the other system is connected to the IP packet network 208 via the router 206 having a control function such as radio resource management.
- a control function such as radio resource management.
- the mobile station in the above system has the configuration shown in FIG. Note that the mobile station can communicate with a plurality of systems (base stations) and has a plurality of reception sequences, but FIG. 7 shows only one sequence for simplicity.
- a signal received via the antenna 301 is subjected to predetermined radio reception processing (down conversion, A / D conversion, etc.) in the radio circuit 302.
- the signal subjected to the radio reception processing is sent to the multi-fill filter 303, and the de-spread processing is performed in the matched filter 303 using the spreading code used in the base station.
- the signal subjected to the despreading process is sent to the demodulation circuit 304, where the signal is demodulated to be received. Further, the signal subjected to the despreading processing and / or the signal subjected to the demodulation processing is sent to the monitor circuit 305.
- the monitor circuit 305 recognizes what kind of service is provided by the base station 202 and the base station 205 based on the control signals from the base station 202 and the base station 205 and controls the control. The signal is output to the control circuit 306. In addition, the monitor circuit 305 measures the reception quality and the moving speed using the signal from the base station, estimates the state of the propagation path to and from the base station, and determines the moving speed of the own station. Recognize. Propagation path estimation result (1) Information on the moving speed is output to the control circuit 306 as a control signal.
- the control circuit 306 outputs control data indicating which system to connect to the adder 307 from the control signal from the monitor circuit 305 and the information of the transmission / reception request and the transmission rate. At the same time, it outputs a switching control signal to the wireless circuit 302 to switch to the frequency of the system corresponding to the service to be connected.
- the adder 307 multiplexes the control data for system connection as described above in the transmission data and outputs the multiplexed control data to the modulation circuit 308.
- the modulation circuit 308 performs digital modulation processing on the multiplexed transmission data and control data, and outputs the result to the spread modulation circuit 309.
- the spread modulation circuit 309 performs spread modulation processing on the transmission data and the control data multiplexed using a predetermined spreading code, and outputs a signal after spread modulation to the radio circuit 302.
- the wireless circuit 302 performs predetermined wireless transmission processing on the transmission data and control data. (D / A conversion, up-conversion, etc.). Further, since a switching control signal for switching to the frequency of the system to be connected is input from the control circuit 303 to the wireless circuit 302, the wireless circuit 302 switches the frequency according to the switching control signal. .
- the transmission data after the radio transmission processing is transmitted to the base station via the antenna 301.
- the mobile station 201 receives signals from the base station 202 and the base station 205, and how the base station 202 and the base station 205 are Recognizes that a system is provided.
- the control signal indicating the system of the base station is sent to the control circuit 310.
- the control circuit 306 selects a connection to the base station 205 by requesting a control signal indicating the system of the base station and high-speed packet transmission. ) Is multiplexed with the transmission data to be sent to the base station 205.
- a switching control signal for switching to the frequency f2 of the system of the base station 205 is transmitted to the radio circuit 302.
- Output to The wireless circuit 302 switches the frequency to f2 according to the switching control signal.
- the base station 205 Upon receiving the signal transmitted from the mobile station 201, the base station 205 receives the signal transmitted from the mobile station 201, and based on the control data included in the signal, that is, the data indicating that connection is desired,
- the request is sent to the control circuit.
- the control circuit 303 controls the control signal and the sound indicating the service of the base station.
- the control data indicating that the connection should be made to the base station 202 is selected, and the control data indicating the selection result (a request for connection) is given.
- the evening is multiplexed with the transmission data sent to the base station 202.
- the control circuit 300 Since the control circuit 303 has determined that it should be connected to the base station 202, the control circuit 300 transmits a switching control signal for switching to the system frequency of the base station 202: f1, f3. 0 Output to 2.
- the wireless circuit 302 switches the frequency between f1 and f3 according to the switching control signal.
- the base station 202 When the base station 202 receives the signal transmitted from the mobile station 201, the base station 202 communicates with the mobile station 201 based on control data included in the signal, that is, data indicating that connection is desired. Move on to connection operation. Then, when the base station 202 and the mobile station 201 are connected, voice communication is started.
- the mobile station 201 is connected to the telephone network 207 via the RNC 203 and the MSC 204 when performing voice communication.
- the TDD system having the asymmetry in the transmission rate in the time domain accommodates high-speed packet transmission
- the FDD system accommodates voice services.
- the FDD system has the same radio frequency band in the upper and lower lines, it basically has the same system capacity in the upper and lower lines. If a large number of asymmetric transmission channels, such as distribution, with a large amount of downlink transmission and a small amount of uplink transmission, are accommodated, the total transmission volume of the upper and lower lines becomes unbalanced, resulting in poor frequency efficiency.
- the system capacity of the uplink and downlink can be easily asymmetric by making the time ratio of the uplink and downlink (number of slots, etc.) asymmetric. For this reason, a high-speed channel (packet) of the downlink can be efficiently accommodated.
- the access method, the modulation method, the frame configuration, the channel configuration, the multiplexing Further asymmetries can be realized by using different methods for the upper and lower lines.
- the TDD system has a guard time to prevent collision caused by propagation delay between the uplink and the downlink.
- the time width of this guard time depends on the cell radius, and needs to be longer as the cell radius increases. This is because, as the cell radius increases, the propagation delay between the cell edge and the base station increases. In this case, if the guard time is insufficient, the uplink received at the base station with a delay is received. This is because the signal overlaps with the transmission timing of the downlink signal and a collision occurs.
- the guard time When the cell radius is increased, the guard time must be increased as described above, and the overhead ratio (percentage of the section where no transmission / reception signal actually occupies in the entire communication time) increases accordingly, deteriorating the transmission efficiency. Will be. Therefore, in TDD systems, large cell radii are generally considered unsuitable. Therefore, the TDD system is suitable for microcells or picocells having a relatively small cell radius.
- This guard time is peculiar to the TDD system that is ping-pong transmission, and is not necessary in the FDD system. For this reason, in the FDD system, there is no restriction on the size of the cell radius due to the guard time, so that it can be applied to a macro cell or a macro cell larger than a pico cell. Therefore, the voice service and the high-speed packet transmission service do not have the same coverage area.
- the voice service and the high-speed packet transmission service do not have the same coverage area.
- by accommodating a high-speed bucket transmission service in a TDD system in a microcell with a reduced cell radius it is possible to prevent a decrease in the transmission rate (throughput) in a cell age that is a problem in HDR.
- the control signal from the base station recognizes which system the base station is, and based on that system, that is, voice that requires real-time or low-speed packets that are non-real-time
- the factor of system switching is not limited to this, and one of the systems can be selected according to the moving speed of the mobile station and the communication environment (propagation state and congestion degree), particularly according to the service. You may make it connect.
- the mobile station moving at high speed is accommodated in the FDD system to reduce the number of inter-cell handovers, and the mobile station moving at low speed is accommodated in the TDD system.
- the mobile station measures the Doppler frequency from the signal received from the base station by the monitor circuit, and selects a system (base station) to be connected by the control circuit based on the information.
- the FDD system accommodates packet transmission services, especially asymmetric packet transmission services, the total transmission volume of the uplink and downlink becomes unbalanced, and Since the wave number utilization efficiency deteriorates, it is desirable to limit the number of accommodating channels and the maximum transmission rate. In this case, limit the maximum transmission rate irrespective of the number of accommodated channels, or perform relatively high-speed bucket transmission (for example, 384 kbps) only when the number of accommodated channels is small, and increase the maximum transmission rate as the number of channels increases. It is conceivable to control to drop (for example, 64 kbps).
- connection to the FDD system circuit switching
- the microcell that is, to connect to the base station 205.
- VoIP Voice over IP
- the mobile station measures the reception quality (SIR, etc.) from the signal received from the base station by the monitor circuit, and selects a system (base station) to be connected by the control circuit based on the information.
- SIR reception quality
- the base station 202 (macro cell) of the FDD system that provides voice services is connected to the telephone network 207 via the RNC 203 and the MSC 204, and the base station 205 (the macro cell) of the TDD system that provides high-speed packet transmission services. Microcell) was described as being connected to the IP packet network 208 via the network 206.
- both the base station 202 (macro cell) of the FDD system that provides voice service and the base station 205 (micro cell) of the TDD system that provides high-speed packet transmission service have the same RNC 203 and MSC. It may be configured to be connected to a backbone (telephone network 207 or IP packet network 208) via 204. In this case, the same effect as above can be obtained.
- the IP packet signal is transmitted via RNC 203 and MSC 204.
- a tunneling technique is used for transmission to the telephone network 207 or the IP packet network 208. That is, instead of directly routing from the base station 202 or the base station 205 to the MSC 204 by looking at the IP address of the communication terminal or the IP address considering mobility such as Mopile IP, as a mobile communication network Separately manages the connection destination to the BTS, and establishes a unique path (oral address, node address) as a mobile communication network, and adopts a method to transfer signals from the IP packet network 208 be able to.
- each system is selected and switched for connection.
- the connection of one mobile station is not an alternative, and the system is changed for each service. If so, lines may be connected for each system at the same time.
- the system selection result may be different for each service.
- the FDD system base station 202
- the TDD system base station 2
- the FDD system base station 2
- the TDD system base station 2
- a mobile station reports a measurement result of a communication environment and a moving speed and a connection request to one system, and determines a connection based on the judgment of the base station to perform communication.
- FIG. 9 is a block diagram showing a configuration of a base station device in the wireless communication system according to Embodiment 2 of the present invention.
- the mobile station transmits a control signal (connection request information) indicating that connection is desired based on the measurement of each service, communication environment, moving speed, and the like, and the measurement. Is sent.
- control signals and signals including the measurement results are received via the antenna 410 and are subjected to predetermined radio reception processing (down conversion, ⁇ / ⁇ conversion, etc.) by the radio circuit 402. Etc.) are performed.
- the signal subjected to the radio reception processing is sent to the demodulation circuit 403 and subjected to demodulation processing to become reception data.
- the demodulated signal is sent to a decision circuit 404.
- the determination circuit 404 determines whether or not to connect to the mobile station based on the connection request information and the measurement result information from the mobile station, as well as the communication state information monitored by the mobile station. For example, when a connection request for high-speed packet transmission is received from a mobile station, if the communication status is poor or the congestion is high, it is determined that high-speed packet transmission cannot be accommodated at present, and control indicating that connection is not possible is performed. The data is output to the adder 405. On the other hand, when it is determined that the current high-speed bucket transmission can be accommodated, control data indicating that connection is possible is output to the adder 405.
- the adder 405 multiplexes the control data for system connection with the transmission data and outputs the multiplexed data to the modulation circuit 406.
- the modulation circuit 406 digitally modulates the multiplexed transmission data and control data and outputs the result to the radio circuit 402.
- predetermined wireless transmission processing (D / A conversion, up-conversion, etc.) is performed on the transmission data and the control data.
- the transmission data after the radio transmission processing is transmitted to the mobile station via the antenna 401.
- the base station apparatus determines whether or not connection to the mobile station is possible based on the connection request information and the communication status information measured by the own station, and when the determination result indicates that connection is possible.
- a communication connection is established with the mobile station, and if the determination result indicates that the connection is not possible, the mobile station is notified of the connection failure.
- the base station determines whether or not the connection is possible and notifies the determination result.
- it may be determined not only whether the base station can be connected but also which system should accommodate the mobile station.
- RNC 203 or MSC 204 determines which system should accommodate the mobile station.
- RNC 203 and the router 206 are provided independently, the mobile station is accommodated in either system between the RNC 203 (or MSC 204) and the router 206.
- a device for determining whether the mobile station is to be accommodated is determined by the device, and the mobile station is notified of the result of the determination.
- Embodiments 1 and 2 describe the case where the wireless communication system includes two systems, the present invention is also applicable to the case where the wireless communication system includes three or more systems. Can be.
- a case is described in which a system to be selected for the moving speed and the communication environment is determined.
- this case is an example, and the service, the moving speed, and the communication environment are selected individually or in combination. It can be implemented by changing the standards as appropriate.
- a wireless communication system includes a wireless communication system having a plurality of systems including a CDMA-FDD system and a CDMA-TDD system, wherein one of the CDMA-FDD system and the CDMA-TDD system has a high transmission rate.
- the mobile station selects a system desired to be connected from a plurality of systems including the CDMA-FDD system and the CDMA-TDD system, and communicates with the selected system.
- this configuration for example, it is possible to accommodate asymmetric high-speed downlink transmission in the TDD system and accommodate other transmissions in the FDD system, thereby improving the frequency utilization efficiency of the entire system. be able to.
- the wireless communication system of the present invention employs a configuration in which, in the above configuration, the CDMA-FDD system and the CDMA-TDD system are controlled by a common control station and connected to a telephone network via an exchange.
- the wireless communication system in the above configuration, At least one of the system and the CD MA-TDD system is connected to the IP bucket network via a router.
- the IP node is connected via an IP network device such as a router.
- an IP network device such as a router.
- the wireless communication system of the present invention employs a configuration in the above-described configuration that enables simultaneous communication with the CDMA-FDD system and the CDMA-TDD system on different lines.
- the mobile station has at least one selected from the group consisting of a service in the CDMA-FDD system and the CDMA-TDD system, a communication environment, and a moving speed of the own station.
- a configuration is adopted in which the system is selected in consideration of this.
- an optimal system can be selected according to a service or the like, so that communication in the system can be performed more efficiently, in particular, high-speed downlink communication can be performed.
- a communication terminal device includes: a monitoring unit that monitors a downlink signal from each system in a wireless communication system having a plurality of systems including a CDMA-FDD system and a CDMA-TDD system; and a monitoring unit that is monitored by the monitoring unit.
- a configuration is provided that includes: a selection unit that selects a system to be connected based on information and a connection request from the own station; and a communication connection unit that performs communication connection with a base station of the system selected by the selection unit.
- an optimal system can be selected, so that communication can be performed more efficiently in the system.
- the selection unit may be a CDMA-FDD System and CDMA-A configuration is adopted in which the system is selected in consideration of at least one selected from the group consisting of the service, communication environment, and moving speed of the local station in the TDD system.
- an optimal system can be selected according to services and the like, so that communication in the system can be performed more efficiently, in particular, downlink high-speed data communication.
- a base station apparatus includes: a determination unit configured to determine whether connection to the communication terminal apparatus is possible based on connection request information from the communication terminal apparatus configured as described above and communication status information measured by the base station; A communication connection unit that performs communication connection with the communication terminal device when the determination result indicates that connection is possible, and notifies the communication terminal device that the connection is impossible when the determination result of the determination unit is not possible. It adopts the configuration to do. According to this configuration, when the mobile station selects a system and issues a connection request to the base station, the base station can determine whether connection is possible by considering various factors such as a communication state.
- the wireless communication system of the present invention has a plurality of systems including a CDMA-FDD system and a CDMA-TDD system, and a mobile station selects a system that desires a desired connection from each system, Since communication is performed with the selected system, high-speed packets can be efficiently transmitted on the downlink for communication. As a result, it is possible to prevent the transmission rate (throughput) from decreasing at the edge of the coverage area, and to improve the frequency utilization efficiency by suppressing the interference, thereby increasing the number of channels accommodated without reducing the average throughput. .
- This description is based on Japanese Patent Application No. 2000-169442 filed on June 6, 2000. All this content is included here.
- the present invention can be applied to a communication terminal device used in a digital wireless communication system.
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Description
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Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP01934496A EP1202473A4 (en) | 2000-06-06 | 2001-06-01 | RADIO COMMUNICATION SYSTEM AND COMMUNICATION TERMINAL FOR USE IN THE SAME |
KR1020027001572A KR20020015724A (ko) | 2000-06-06 | 2001-06-01 | 무선 통신 시스템 및 그것에 이용하는 통신 단말 장치, 및기지국 장치 |
AU60694/01A AU6069401A (en) | 2000-06-06 | 2001-06-01 | Radio communication system and communication terminal apparatus used therein |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2000169442A JP2001346265A (ja) | 2000-06-06 | 2000-06-06 | 無線通信システム及びそれに用いる通信端末装置 |
JP2000-169442 | 2000-06-06 |
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Publication Number | Publication Date |
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WO2001095524A1 true WO2001095524A1 (fr) | 2001-12-13 |
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Application Number | Title | Priority Date | Filing Date |
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PCT/JP2001/004651 WO2001095524A1 (fr) | 2000-06-06 | 2001-06-01 | Systeme de radiocommunication et appareil terminal de communication utilise dans ce systeme |
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US (1) | US20020105935A1 (ja) |
EP (1) | EP1202473A4 (ja) |
JP (1) | JP2001346265A (ja) |
KR (1) | KR20020015724A (ja) |
CN (1) | CN1381108A (ja) |
AU (1) | AU6069401A (ja) |
WO (1) | WO2001095524A1 (ja) |
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JP6150487B2 (ja) * | 2012-10-09 | 2017-06-21 | 株式会社Nttドコモ | ユーザ端末、無線基地局、無線通信システム及び無線通信方法 |
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- 2001-06-01 AU AU60694/01A patent/AU6069401A/en not_active Abandoned
- 2001-06-01 KR KR1020027001572A patent/KR20020015724A/ko not_active Application Discontinuation
- 2001-06-01 EP EP01934496A patent/EP1202473A4/en not_active Withdrawn
- 2001-06-01 CN CN01801573A patent/CN1381108A/zh active Pending
- 2001-06-01 US US10/048,222 patent/US20020105935A1/en not_active Abandoned
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Also Published As
Publication number | Publication date |
---|---|
EP1202473A1 (en) | 2002-05-02 |
EP1202473A4 (en) | 2002-10-09 |
US20020105935A1 (en) | 2002-08-08 |
KR20020015724A (ko) | 2002-02-28 |
CN1381108A (zh) | 2002-11-20 |
JP2001346265A (ja) | 2001-12-14 |
AU6069401A (en) | 2001-12-17 |
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