WO2004110091A1 - 無線通信装置、無線通信方法、通信チャネルの割当方法および割当装置 - Google Patents
無線通信装置、無線通信方法、通信チャネルの割当方法および割当装置 Download PDFInfo
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- WO2004110091A1 WO2004110091A1 PCT/JP2004/008003 JP2004008003W WO2004110091A1 WO 2004110091 A1 WO2004110091 A1 WO 2004110091A1 JP 2004008003 W JP2004008003 W JP 2004008003W WO 2004110091 A1 WO2004110091 A1 WO 2004110091A1
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- 238000004891 communication Methods 0.000 title claims abstract description 819
- 230000006854 communication Effects 0.000 title claims abstract description 817
- 238000000034 method Methods 0.000 title claims description 118
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Classifications
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W72/00—Local resource management
- H04W72/04—Wireless resource allocation
- H04W72/044—Wireless resource allocation based on the type of the allocated resource
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W36/00—Hand-off or reselection arrangements
- H04W36/14—Reselecting a network or an air interface
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W36/00—Hand-off or reselection arrangements
- H04W36/14—Reselecting a network or an air interface
- H04W36/142—Reselecting a network or an air interface over the same radio air interface technology
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W84/00—Network topologies
- H04W84/18—Self-organising networks, e.g. ad-hoc networks or sensor networks
Definitions
- Wireless communication device wireless communication method, communication channel allocating method and allocating device
- the present invention relates to a radio communication device connectable to both an ad hoc network and a mobile communication network, a radio communication method using the same, a communication channel allocation method used in the ad hoc network, and a communication channel allocation device.
- a mobile station is composed of wireless communication devices such as a mobile phone, a personal computer, and a PDA, and data transmission between the mobile station and the base station is performed wirelessly.
- wireless communication devices such as a mobile phone, a personal computer, and a PDA
- data transmission between the mobile station and the base station is performed wirelessly.
- a base station Base Station
- GSM Global System for Mobile Communications
- WDMA Wideband Code Division Multiple Access
- FDD Frequency Division
- TDD Time Division Duplex
- FIG 17 shows the frame configuration of TDD-CDMA (Code Division Multiple Access), which adopts this TDD system as the duplex system.
- TDD-CDMA Code Division Multiple Access
- the ratio and arrangement of the time slots allocated to the uplink and the downlink can be appropriately set according to the traffic volume and the like.
- an ad hoc network is known as a short-range wireless data communication network.
- this ad hoc network as shown in FIG. 18, it is possible to directly communicate between wireless communication devices within a radio wave range without the intervention of a base station. Therefore, according to the ad hoc network, there is no need for a base station or an access point, and there is an advantage that a network can be easily constructed even in a place without such communication facilities.
- communication technologies for constructing such an ad hoc network for example, Bluetooth and wireless LAN (IEEE802.11x) have been proposed.
- the present invention has been made in view of such circumstances, and a first object of the present invention is to provide a function capable of connecting to both an ad hoc network and a mobile communication network, but without complicating the device configuration.
- An object of the present invention is to provide a wireless communication device and a wireless communication method that can avoid an increase in cost and can smoothly switch a connected network.
- a second object of the present invention is to provide an orthogonality of spread code even when the same frequency band is used by adopting a common TDD-CDMA system for communication in an ad hoc network and a mobile communication network.
- a wireless communication device that can avoid collapse To provide.
- a third object of the present invention is to achieve mutual interference between networks even when the same frequency band is used by adopting a common TDD-CDMA system for communication in an ad hoc network and a mobile communication network.
- An object of the present invention is to provide a wireless communication device capable of minimizing noise.
- a fourth object of the present invention is to reduce the reception characteristics due to interference signals even when the same frequency band is used by employing a common TDD-CDMA system for communication in an ad hoc network and a mobile communication network. It is an object of the present invention to provide a wireless communication device capable of suppressing communication and preventing a reduction in communication capacity of the entire network.
- a fifth object of the present invention is to suppress mutual interference between two networks even when the same frequency band is used by adopting a common TDD-CDMA system for communication in an ad hoc network and a mobile communication network. Accordingly, a communication channel allocating method, a communication channel allocating apparatus, and a communication channel allocating method capable of securing a good communication state and avoiding a decrease in throughput and communication capacity can be avoided. To provide a wireless communication device.
- a wireless communication apparatus uses a TDD-CDMA system for communication with a base station of a mobile communication network, as described in claim 1.
- a wireless communication device for example, the first wireless communication device 10 and the like
- another wireless communication device for example, the other first wireless communication device 10 and the second wireless communication device 20 and the like
- Ad hoc communication means for establishing a do-hoc network and communicating wirelessly with the other wireless communication apparatus, wherein the ad hoc communication means cooperates with the mobile communication network when communicating with the other wireless communication apparatus. It is characterized by using a common TDD-CDMA system.
- TDD-CDMA is CDMA that uses the TDD scheme for the decoding scheme.
- CDMA is one of the multiple access systems to which the spread spectrum system is applied, and is a communication system called code division multiple access.
- CDMA has a single carrier system that transmits using a single carrier, and multiple systems to reduce the effects of fading. And a multi-carrier scheme using the same carrier.
- the TDD-CDMA includes, for example, TD-CDMA standardized by 3GPP (3rd Generation Partnership Project).
- wireless communication devices existing in the vicinity include, for example, a connection function with a mobile communication network in addition to a wireless communication device having a connection function with a mobile communication network as described above. It also includes information terminals that do not have them (computers, PDAs, etc.) and peripheral devices for information terminals (eg, headsets, printers, mice, displays). These wireless communication devices establish an ad hoc network with at least other wireless communication devices within a radio wave reach, and perform a mutual communication between the wireless communication devices in the ad hoc network. (Hereinafter referred to as ad hoc communication function).
- the ad hoc communication means detects, for example, surrounding wireless communication devices capable of constructing the ad hoc network as described in claim 2, and acquires and stores information on the wireless communication devices from each of them. After executing the process of storing the information in the means, the information about the wireless communication device to be the communication partner is extracted from the information stored in the storage device, and the wireless communication device to be the communication partner is extracted based on the information. It is possible to configure so as to communicate with each other in the ad hoc network.
- information on the wireless communication device includes, for example, a spread code used by each wireless communication device for transmission, an identification code (ID) of each wireless communication device, and attribute information of each wireless communication device (device type, performance, etc.). , Security level, etc.), and information on the communication path to each wireless communication device.
- the ad hoc communication means measures an interference level based on a received signal and controls output power of transmission power based on the measured value.
- ad hoc communication means is provided under mobile communication as described in claim 4. Communication within the above-mentioned ad hoc network may be performed using a time slot set for the communication line.
- the wireless communication method provides a method for constructing an ad hoc network using a plurality of wireless communication devices, as described in claim 5.
- a wireless communication method characterized in that the same frequency band is used for communication in an ad hoc network by adopting a TDD-CDMA system common to communication in a mobile communication network.
- the plurality of wireless communication devices include a wireless communication device that does not have a connection function with a mobile communication network but has an ad hoc communication function.
- the common TDD-CDMA system is used for communication in the ad hoc network and the mobile communication network, connection is made to both the ad hoc network and the mobile communication network. It is possible to provide a possible wireless communication device with a simple configuration at a low cost. Moreover, according to the wireless communication device, switching of the network to be connected can be performed smoothly.
- the wireless communication devices within the ad hoc network communicate with each other, the load on the mobile communication network can be reduced, thereby improving the communication efficiency of the entire network.
- the communication capacity network capacity
- radio waves do not reach the base station
- other wireless communication devices within the ad hoc network that reach the base station can be used as relay devices, and connection to the mobile communication network can be established.
- the possible area can be expanded as a result.
- a wireless communication apparatus uses a TDD-CDMA system for communication with a base station of a mobile communication network, as described in claim 6.
- a wireless communication device comprising: an ad hoc communication unit configured to establish an ad hoc network with other wireless communication devices present in the vicinity and wirelessly communicate with the other wireless communication device;
- the same TDD-CDMA system as the mobile communication network is used. It is characterized by adopting the same frequency band for adoption and performing communication with the other wireless communication device in synchronization with the communication in the mobile communication network. .
- the ad hoc communication unit detects surrounding wireless communication devices capable of constructing the ad hoc network, acquires information on the wireless communication devices from each of the wireless communication devices, and stores the information in the storage unit. After executing the processing, information on the wireless communication device to be a communication partner is extracted from the information stored in the storage means, and the wireless communication device to be the communication partner and the information in the ad hoc network are extracted based on the information. Can be configured to communicate with each other.
- the ad hoc communication means can be configured to synchronize with the communication in the mobile communication network based on the synchronization information received from the base station, as described in claim 8. It is.
- the wireless communication method provides a method for constructing an ad hoc network using a plurality of wireless communication devices, as described in claim 9.
- a wireless communication method wherein the same frequency band is used for communication in an ad hoc network by adopting a common TDD-CDMA system as communication in a mobile communication network, and communication with the mobile communication network is performed. It is characterized in that communication within the ad hoc network is performed with synchronization.
- the plurality of wireless communication devices include a wireless communication device that does not have a function of connecting to a mobile communication network but has an ad hoc communication function.
- the same frequency band is adopted by adopting a common TDD-CDMA scheme for communication in an ad hoc network and a mobile communication network. Since a wireless communication device is used, a wireless communication device that can be connected to both an ad hoc network and a mobile communication network can be provided at a low cost with a simple configuration.
- a wireless communication apparatus serves as a mobile station of a mobile communication network, and A wireless communication device that communicates with a base station using the TDD-CDMA method.
- An ad hoc that establishes an ad hoc network with other nearby wireless communication devices and wirelessly communicates with the other wireless communication devices.
- Communication means wherein the ad hoc communication means uses the same frequency band for communication with the other wireless communication device by employing a common TDD-CDM system with a mobile communication network, In the communication area of each base station, a spreading code orthogonal to the spreading code used for communication with the base station is used for communication in the ad hoc network.
- the ad hoc communication means detects neighboring wireless communication devices having an ad hoc communication function, and information on those wireless communication devices (for example, node information such as ID and node type, and communication information such as spreading codes and time slots). After performing a process of acquiring information about a channel from a specific wireless communication device (master) and storing the information in a storage unit, the communication channel assigned by the specific wireless communication device (master) is used. It communicates with other wireless communication devices in the ad hoc network.
- node information such as ID and node type
- communication information such as spreading codes and time slots
- the spreading code is configured by a combination of a channelization code composed of an orthogonal variable spreading factor code and a scrambling code, as described in claim 11, and the ad hoc communication means is provided in a communication area of each base station.
- a scramble code orthogonal to a scramble code used for communication with a base station is used for communication in an ad hoc network.
- the scrambling code used for communication with the base station is Sc
- the scrambling code used for communication in the ad hoc network is Sa
- the ad hoc communication means communicates with another wireless communication device in the ad hoc network in synchronization with the communication in the mobile communication network, as described in claim 13.
- the same frequency band is adopted by adopting a common TDD-CDMA scheme for communication in an ad hoc network and a mobile communication network. Since this is used, it is possible to avoid the increase in cost and the complexity of the device configuration, and to smoothly switch the network to be connected.
- a spreading code orthogonal to the spreading code used for communication with the base station is used for communication in the ad hoc network. Even when the same frequency band is used by adopting a common TDD-CDMA system for communication, mutual interference between networks can be minimized.
- a wireless communication apparatus uses a TDD-CDMA system for communication with a base station of a mobile communication network, as described in claim 14.
- a wireless communication device comprising: an ad hoc communication unit configured to establish an ad hoc network with another wireless communication device existing in the vicinity and communicate wirelessly with the other wireless communication device;
- the same frequency band is used using the same TDD-CDMA system as the mobile communication network, and interference other than the desired signal transmitted from the other wireless communication devices is used. It is characterized by having interference signal removing means for removing a signal.
- the ad hoc communication means detects neighboring wireless communication devices having an ad hoc communication function, and information on those wireless communication devices (for example, node information such as ID and node type, and communication information such as spreading codes and time slots). After performing a process of acquiring information about a channel from a specific wireless communication device (master) and storing the information in the storage device, the information related to the wireless communication device to be a communication partner is selected from the information stored in the storage device. Information is extracted, and based on the information, the wireless communication device as the communication partner communicates with each other in the ad hoc network.
- node information such as ID and node type
- communication information such as spreading codes and time slots
- the interference signal canceling means it is possible to apply a well-known interference canceling technique. For example, (1) convolution of the channel estimation value of each user with the spreading code assigned to each user Multiplying the received signal by the system matrix to generate a system matrix, and joint detection (Joint Detection) to extract the demodulated signal; and (2) generating a copy of the interference signal from each user signal. Interference canceller that suppresses interference by subtracting this from the received signal
- Interference Canceller can be used.
- joint detection and interference canceller for example, Ramjee Prasad,
- the interference signal removing means obtains a channel estimation value of the desired signal and the interference signal from a known signal (for example, a midamble) included in the received signal, as described in claim 15. It is possible to adopt a configuration in which the interference signal is removed by joint detection using a channel estimation value and a spreading code assigned to each wireless communication device.
- the interference signal removing means is configured to generate the replica of the interference signal and execute a process of subtracting the replica from the received signal to remove the interference signal. It is possible.
- the interference signal includes a signal from a base station or a mobile station of the mobile communication network and a signal exchanged in communication in the ad hoc network, as described in claims 17 and 18. Of these, signals that are not synchronized with the desired signal are included.
- a wireless communication apparatus provides a TDD-CD for communication with a base station of a mobile communication network, as described in claim 19.
- a wireless communication device using the MA method comprising: an ad hoc communication unit configured to establish an ad hoc network with other wireless communication devices existing in the vicinity and wirelessly communicate with the other wireless communication device.
- the same frequency band is adopted by using the TDD-CDMA system common to the above-mentioned mobile communication network, and the uplink and downlink of the above-mentioned mobile communication network are used.
- the magnitude of the interference signal is measured, and based on the measured value, the timer used for communication in the ad hoc network is determined. It is characterized in that selecting a slot.
- a method of selecting a time slot to be used for communication in the ad hoc network a comparison is made between a time slot set for the uplink and a time slot set for the downlink of the mobile communication network. And selecting a time slot that satisfies a preset condition (for example, a condition relating to the magnitude of an interference signal) as an ad hoc communication time slot.
- a preset condition for example, a condition relating to the magnitude of an interference signal
- the time slot with the larger amount of interference is selected, the power consumption of the wireless communication device increases, but the amount of interference from the wireless communication device in the downlink of the mobile communication network decreases.
- the advantage is that the characteristics are improved when the characteristics of the whole network are considered.
- the ad hoc communication means performs output control of transmission power based on the measured value of the interference signal, as described in claim 20.
- the ad hoc communication means measures the magnitude of the interference signal for each of the time slots set on the uplink and the downlink of the mobile communication network, as described in claim 21.
- the time slot used for communication in the ad hoc network may be individually determined by comparing the measured value with a preset threshold value.
- the ad hoc communication means when the magnitude of the interference signal in the time slot set in the uplink of the mobile communication network is equal to or less than a threshold value, as described in claim 22, The time slot set in the downlink of the network is used for communication in the ad hoc network, and if the magnitude of the interference signal in the time slot set in the downlink is equal to or smaller than the threshold, the time slot set in the uplink is set.
- the time slot is used for communication in an ad hoc network.
- the magnitude of the interference signal of the time slot set in the uplink of the mobile communication network is equal to or smaller than the threshold and the magnitude of the interference signal in the time slot set in the downlink is equal to or smaller than the threshold.
- the ad hoc communication means uses both time slots set for the downlink and the uplink for communication in the ad hoc network.
- an interference signal other than a desired signal included in a received signal is removed, so that the communication is common to an ad hoc network and a mobile communication network.
- TDD CDM
- the magnitude of the interference signal is measured, and the time slot used for communication in the ad hoc network is measured based on the measured value.
- the transmission power output is controlled in accordance with the measured value, so that interference between the ad hoc network and the mobile communication network is less likely to occur, and when any of the networks is used, A good communication state can be ensured.
- the magnitude of the interference signal is measured, and the measured value is compared with a preset threshold to obtain an ad hoc network. Since the time slot used for communication within the network is determined individually, it is possible to use at most both the uplink and downlink time slots for communication within the ad hoc network. For this reason, for example, the communication efficiency in an ad hoc network is improved as compared with a case in which only one of an uplink and a downlink of a mobile communication network is selected and used in communication in the ad hoc network. It becomes possible.
- a communication channel allocation method includes a TDD common to communication in an ad hoc network and a mobile communication network.
- TDD Uses the communication channel specified by the time slot and spreading code of the CDMA for communication in the above ad hoc network.
- a method of allocating a communication channel as a communication channel comprising, among a plurality of wireless communication devices constituting the ad hoc network, a wireless communication device that manages the entire network as a master, and a wireless communication device that performs communication under the management of the master.
- the above-mentioned master dynamically communicates from all the pre-registered communication channels to the communication in the ad hoc network.
- Extract the allocatable communication channels, the extracted communication Ji Yaneru set the assigned priority based on a predetermined evaluation criterion related to communication conditions
- the master issues a communication channel allocation request from the slave, allocates a communication channel based on the priority of the allocation, and notifies the slave of the communication channel. It is characterized by having a step.
- the wireless communication device is a peripheral wireless communication device having an ad hoc communication function.
- Nodes and information on the wireless communication devices (for example, node information such as IDs and node types, information on communication channels specified by spreading codes and time slots, etc.) is acquired from the master and stored. After executing the process of storing the information in the storage unit, information about the wireless communication device to be the communication partner is extracted from the information stored in the storage unit, and the wireless communication device to be the communication partner is ad hoc based on the information. Communication within the network.
- the predetermined evaluation criteria relating to the communication conditions include, for example, evaluation criteria relating to the network form, load status, and interference state.
- the evaluation criteria relating to the interference state include the interference level in each time slot. Is included.
- evaluation criteria related to the network form include, for example, communication channels used in up-down bidirectional communication and when one node in an ad hoc network communicates with a plurality of nodes. Evaluation criteria such as the communication channel to be allocated, which are distinguished by whether or not the communication channel to be allocated satisfies a specific condition, and the like.
- the master sets the interference level in each time slot of TDD-CDMA as a predetermined evaluation criterion related to the communication condition. May be measured, and the priority of the assignment may be set such that the lower the interference level is, the higher the communication channel is.
- the master preferentially assigns communication channels having the same time slot and different spreading codes, as described in claim 26. It is desirable.
- the master when the master issues a communication channel allocation request from the slave, A set of communication channels having the same spreading code but different time slots may be preferentially assigned as communication channels used in uplink and downlink bidirectional communication.
- the master in the communication channel allocating method according to the present invention, as set forth in claim 28, the master may be configured such that any one of the wireless communication devices configuring the ad hoc network includes a plurality of wireless communication devices in the ad hoc network. It is preferable to preferentially assign communication channels having different spreading codes in the same time slot as the communication channels when communicating with the communication.
- the spreading code is configured by a combination of a scrambling code unique to the ad hoc network and a channelization code including an orthogonal variable spreading factor code, as set forth in claim 29, wherein the channelization code Includes a channelization code for a control signal and a channelization code for a data signal. Preferably, it is dynamically assigned.
- a control signal is a control signal exchanged between a master and a slave when building and maintaining an ad hoc network
- a data signal is a data signal of the ad hoc network. This is a data signal exchanged between nodes.
- a communication channel allocating apparatus provides a communication channel allocating apparatus common to communication in an ad hoc network and a mobile communication network.
- the communication channel specified by the TDD-CDMA time slot and the spreading code is set in the ad hoc network.
- Priority setting means for setting allocation priorities based on predetermined evaluation criteria relating to communication conditions for the extracted communication channel;
- a communication channel allocating means for allocating a communication channel based on the priority of the above allocation when a communication channel allocation request is received from a node constituting the network, and notifying the node of the communication channel;
- the priority setting means measures an interference level in each time slot of TDD-CDMA as a predetermined evaluation criterion relating to the communication condition, and sets the priority so that a communication channel having a lower interference level has a higher priority. It is characterized by setting.
- a wireless communication apparatus provides a TDD-communication apparatus common to communication in an ad hoc network and a mobile communication network, as described in claim 31.
- a wireless communication device that uses the same frequency band by adopting the CDMA method, and uses a communication channel specified by the TDD-CDMA time slot and spreading code for communication within the above ad hoc network.
- a communication channel allocating device for allocating as a communication channel, wherein the communication channel allocating device is capable of dynamically allocating to communication in the ad hoc network from all communication channels registered in advance. Priority setting that extracts communication channels and assigns priority to the extracted communication channels based on predetermined evaluation criteria related to communication conditions.
- the priority order setting means measures the interference level in each time slot of the TDD-CDMA as a predetermined evaluation criterion relating to the communication condition, and a communication channel having a lower interference level has a higher priority. It is characterized in that the above-mentioned priorities are set so as to be as follows.
- a communication channel that can be dynamically allocated to communication in an ad hoc network is extracted from all communication channels registered in advance, and the extracted communication channel is Therefore, priorities of allocation are set based on a predetermined evaluation criterion relating to communication conditions, and when a communication channel allocation request is made, communication channels are allocated based on the above priority of allocation. Therefore, even in a network environment in which an ad hoc network and a mobile communication network coexist, it is possible to allocate communication channels according to communication conditions, and to improve the efficiency and optimization of communication in an ad hoc network. Can be.
- each time slot of TDD- The priority level of the above allocation is set so that the lower the interference level is, the higher the priority is assigned to the communication channel. Therefore, the common level is used for communication between the ad hoc network and the mobile communication network. Even when the same frequency band is used by adopting the TDD-CDMA system, mutual interference between the two networks can be suppressed, thereby ensuring a good communication state and improving throughput. A reduction in capacity can be avoided.
- FIG. 1 is a schematic configuration diagram showing an embodiment of an ad hoc network to which a wireless communication method according to the present invention is applied.
- FIG. 2 is a diagram illustrating a state in which communication is performed with synchronization between an ad hoc network and a mobile communication network.
- FIG. 3 is a block diagram showing a main configuration of the first wireless communication device in FIG.
- FIG. 4 is a flowchart for explaining the process of connecting to the ad hoc network of FIG.
- FIG. 5 is a diagram showing a configuration of a time slot of TDD-CDMA.
- FIG. 6 is a block diagram illustrating a main configuration of the first wireless communication device according to the second embodiment.
- FIG. 7 is a schematic diagram illustrating a method of selecting a time slot used for communication in an ad hoc network.
- FIGS. 8A and 8B are schematic diagrams illustrating an interference signal generated in a downlink of a mobile communication network.
- FIGS. 9A and 9B are schematic diagrams illustrating an interference signal generated in an uplink of a mobile communication network.
- FIG. 10 is a diagram showing a modification of the receiver in FIG.
- FIG. 11 is a schematic diagram illustrating a third embodiment of a method for selecting a time slot used for communication in an ad hoc network.
- FIG. 12 is a schematic diagram showing a state in which an ad hoc network is constructed near a base station.
- Figure 13 shows that an ad hoc network is constructed at a location away from the base station It is a schematic diagram which shows a state.
- FIG. 14A and FIG. 14B are schematic diagrams for explaining a method of minimizing time slot allocation.
- FIG. 15 is a schematic configuration diagram illustrating an example of a mobile communication network.
- FIG. 16 is a schematic diagram for explaining the TDD system and the FDD system.
- FIG. 17 is a diagram illustrating an example of a TDD-CDMA frame configuration.
- FIG. 18 is a schematic configuration diagram illustrating an example of an ad hoc network. BEST MODE FOR CARRYING OUT THE INVENTION
- FIG. 1 shows an embodiment of an ad hoc network to which a wireless communication method according to the present invention is applied.
- reference numeral 10 denotes a first wireless communication device
- reference numeral 20 denotes a second wireless communication device.
- the first wireless communication device 10 is a wireless communication device (wireless communication device according to the present invention) having a function of connecting to a mobile communication network, and includes, for example, a mobile phone, a PDA, and a personal computer.
- the first wireless communication device 10 uses a TDD-CDMA system for communication with a base station 30 of a mobile communication network.
- the second wireless communication device 20 is a wireless communication device that does not have a function of connecting to a mobile communication network, and includes, for example, information connected by wire or wireless to a fixed communication network such as a LAN (Local Area Network). It consists of terminals (for example, personal computers, workstations, etc.) and peripheral devices for information terminals (for example, headsets, printers, and mice).
- a fixed communication network such as a LAN (Local Area Network).
- terminals for example, personal computers, workstations, etc.
- peripheral devices for information terminals for example, headsets, printers, and mice.
- first and second wireless communication devices 10 and 20 construct an ad hoc network with other wireless communication devices 10 and 20 existing in the vicinity, and communicate with each other between the wireless communication devices in the ad hoc network. It has an ad hoc communication function, and uses the same frequency band by adopting a common TDD-CDMA system as the communication system in the mobile communication network. As shown in Fig. 2, the communication is synchronized with the communication in the mobile communication network. And perform communication within the ad hoc network.
- FIG. 3 is a block diagram illustrating a main configuration of the first wireless communication device.
- the first wireless communication device 10 has a transmitter 11, a receiver 12, an antenna 13, a control unit 14, and a storage unit 15.
- the transmitter 11 includes a transmission data processing unit 11 a for generating a transmission signal, a primary modulation unit 1 lb for performing primary modulation of a carrier with a transmission signal, and a spreading code (orthogonal spreading code) for a modulated signal obtained by the primary modulation. ), A spreading section 11 c for performing spread modulation (secondary modulation) and an amplification section 11 d for amplifying the spread modulated signal. That is, the transmission signal generated by the transmission data processing unit 11a is primary-modulated by the primary modulation unit 11b by a predetermined modulation method, and then spread-modulated by the spreading code by the spreading unit 11c. Thereafter, the signal is amplified by the amplifier 11 d and radiated from the antenna 13 as radio waves.
- a transmission data processing unit 11 a for generating a transmission signal
- a primary modulation unit 1 lb for performing primary modulation of a carrier with a transmission signal
- a spreading code orthogonal spreading code
- the spreading code is configured by a combination of a channelization code and a scrambling code, and a spreading code orthogonal to a spreading code used for communication with the base station 30 is added. It is being assigned to communications within the hook network.
- the receiver 12 includes a band-pass filter 12a for removing unnecessary noise components included in the received signal received from the antenna 13 and a spread code for the received signal passing through the band-pass filter 12a.
- a reception data processing unit 12 d for performing various processing is provided. That is, the received signal received by the antenna 13 is despread by the same spreading code as that on the transmitting side after the noise component is removed by the bandpass filter 12a, and then the demodulation unit 12c The signal is demodulated at and returned to the baseband waveform.
- the control unit 14 controls the transmitter 11 and the receiver 12 based on various types of information stored in the storage unit 15.
- the control unit 14 controls the ad hoc network and the ad hoc network. Synchronization control (synchronization acquisition and synchronization maintenance) between mobile communication networks, transmission and reception switching control, transmission power output control (power control), ad hoc Switching control between a network and a mobile communication network is performed. For example, when communicating with a base station 30 of a mobile communication network or another wireless communication device in an ad hoc network using a wireless line, transmission and reception are performed based on a preset time slot assignment. Switching is performed, and communication is performed in the TDD system.
- the ad hoc network when communicating with another wireless communication device in the ad hoc network, the ad hoc network is controlled so as to match the communication timing in the mobile communication network based on the synchronization information received from the base station 30.
- the communication timing with other wireless communication devices within is set.
- an interference level is detected from the received signal input to the receiver 12, and the transmission power is adjusted according to the interference level. It has become.
- the transmitter 11, the receiver 12, the antenna 13, the control unit 14, the storage unit 15, and the like constitute an ad hoc communication unit according to the present invention.
- the second wireless communication device 20 also has a transmitter, a receiver, an antenna, a control unit, and a storage unit similar to those of the first wireless communication device 10. It is possible to communicate with other wireless communication devices in the network using a wireless line without the intervention of the base station 30.
- step S1 processing for switching the communication mode to the ad hoc mode is performed. This process may be automatically performed when a preset condition is satisfied, or may be performed based on a user's input operation.
- step S2 a process of acquiring information on the wireless communication devices 10 and 20 existing around the device is performed. Specifically, based on the received signal input to the receiver 12, it is checked whether or not the wireless communication devices 10 and 20 in the ad hoc mode are present in the vicinity, and as a result, the wireless communication devices 10 and 20 are in the ad hoc mode. If another wireless communication device 10 or 20 exists in the vicinity, it is determined whether or not each of the wireless communication devices 10 and 20 has authority to connect to an ad hoc network.
- the wireless communication devices that can establish an ad hoc network are selected from the wireless communication devices 10 and 20 in the ad hoc mode based on the determination results. Is identified and detected. After that, information about the wireless communication devices (for example, a spreading code used at the time of transmission, an ID unique to the device) is stored in a storage unit such as the storage unit 15, and the process proceeds to the next step S3. In step S3, a process of selecting a time slot to be used for communication in the ad hoc network from the time slots of the TDD-CDMA is performed.
- the selection methods are (1) a method of selecting only the time slot specified for the downlink (Downlink), (2) a method of selecting only the time slot specified for the uplink (Uplink), and (3) a method of selecting only the time slot specified for the uplink.
- only the time slot designated for the downlink is selected.
- step S4 a signal from the base station 30 is received, synchronization information included in a predetermined time slot of the received signal is extracted, and communication in the mobile communication network is performed based on the synchronization information.
- a process is performed to set the communication timing in the ad hoc network so as to match the timing.
- step S5 information on the wireless communication device (the first wireless communication device 10 or the second wireless communication device 20) to be the communication partner is extracted from the information stored in the storage means, and the information is extracted. Based on the information, the communication with the wireless communication device as the communication partner is performed via the ad hoc network. In this case, power control is performed so that nearby wireless communication devices that are not participating in the ad hoc network do not interfere. That is, the interference levels of all time slots are measured based on the received signal input to the receiver 12, and the sum of the measured value and a preset offset value (positive or negative number) is calculated. As the maximum value of transmission power (allowable value), output control of transmission power is performed so as not to exceed this maximum value.
- step S2 the process of monitoring the state of the ad hoc network is repeated at a predetermined cycle, and information on the wireless communication devices 10 and 20 included in the ad hoc network is appropriately updated (step S2). 6). Also, when the number of wireless communication devices constituting the ad hoc network becomes “1”, the ad hoc network automatically disappears.
- channelisation codes Two types of spreading codes are used: channelisation codes and scrambling codes.
- the channelization code is an OVSF (Orthogonal Variable Spreading Factor) code.
- the receiving side base station or mobile station
- the transmitting side mobile station or base station
- the receiving side base station or mobile station
- an ad hoc network it is used to identify the transmitting node and receiving node in the network.
- This channelization code can be shared between the mobile communication network and the ad hoc network.
- the control signal exchanged between the master and the slave is used.
- Channel codes for data signals exchanged between each node, and the channelization codes for data signals are used dynamically for communication in the ad hoc network. To be assigned to
- the scramble code is used to identify a mobile communication network and an ad hoc network, and in a mobile communication network, is used to identify a cell to which a base station and a mobile station belong. That is, a scrambling code is set for each cell so as not to overlap between neighboring cells, and in the present embodiment, a scrambling code orthogonal to the scrambling code set for the cell is constructed in the cell. Assigned to a do-hoc network.
- the channelization code is a code having a length Qc having a real number as an element.
- the scramble code is a code having a length of Q s and having a complex number as an element.
- each element S ck of the scramble code S c takes any value of ⁇ 1, j, 11-j ⁇ .
- all base stations 30 constituting the mobile communication network communicate with each other via a wired network, or by using GPS (Global Positioning System) or DGPS (Differential GPS). Synchronize the time of the entire mobile communication network.
- GPS Global Positioning System
- DGPS Different GPS
- each base station 30 inserts information for synchronization into a predetermined time slot set in a time slot of TDD-CDMA, and transmits a signal including the information so as to reach the entire cell.
- the time slot of TDD—CDMA is configured such that one frame is composed of 15 time slots and one time slot is composed of 256 chips. Each time slot is assigned to one of the uplink (Uplink) and downlink (Downlink).
- the radio communication devices 10 and 20 in the cell receive the signal from the base station 30 and extract information for synchronization included in the predetermined time slot of the received signal, and Based on the information, a process of setting the communication timing in the ad hoc network (the process of step S4 described above) is performed so as to match the communication timing in the mobile communication network at the chip level.
- a method for achieving synchronization based on the synchronization information includes, for example, a method using a sliding correlator, a method using a matched filter, and the like, and any method may be adopted.
- a code sequence known between the base station 30 and the wireless communication device for example, a Go1d code
- the phase of the above-mentioned code sequence is gradually changed in the wireless communication device (reception side), and the phase is sequentially compared with the code sequence received from the base station 30 (transmission side).
- synchronization acquisition at the chip level is performed, and by detecting a plurality of pieces of information of the peak, synchronization acquisition at the slot and frame levels is performed.
- the above processing establishes synchronization between the ad hoc network and the mobile communication network.
- the same frequency band is used by adopting the common TDD-CDMA system for communication in the ad hoc network and the mobile communication network.
- Communication network It is possible to provide the wireless communication device 10 connectable to both of them at a low cost with a simple configuration.
- each base station 30 a spreading code orthogonal to the spreading code used for communication with the base station 30 is used for communication in the ad hoc network. Even when the same frequency band is used by adopting the common TDD_CDMA system for communication in the communication network, mutual interference between networks can be minimized.
- the wireless communication devices 10 and 20 in the ad hoc network communicate with each other, the load on the mobile communication network can be reduced. Not only can it increase efficiency, but it can also increase network capacity.
- the other wireless communication devices 10 and 20 in the ad hoc network where the radio wave reaches the base station 30 can be used as a relay device.
- the area that can be connected to the mobile communication network can be expanded.
- a handover between the two networks can be performed smoothly.
- the control unit 14 selects whether to use the mobile communication network or the ad hoc network when performing communication, for example, in consideration of the following elements. I have to.
- the factors include (1) whether the wireless communication device that is the communication partner exists in the ad hoc network, or (2) the communication partner.
- the wireless communication device in the ad hoc network to be able to communicate well with the mobile communication network or wired network, (3) whether the call is received from outside the ad hoc network, (4) Balance of communication quality and traffic volume between mobile communication network and ad hoc network, (5) security, (6) multicast target is included in ad hoc network, (7) headset of communication partner ⁇ ⁇ Whether the device is a peripheral device such as a mouse.
- FIG. 6 is a block diagram illustrating a main configuration of the first wireless communication device.
- the first wireless communication device 10 has a transmitter 11, a receiver 12, an antenna 13, a control unit 14, and a storage unit 15.
- the transmitter 11 includes a transmission data processing unit 11a for generating a transmission signal, a primary modulation unit 11 for primary-modulating a carrier with a transmission signal, and a primary modulation unit.
- a spreading unit 11 that spreads (modulates) the modulated signal with a spreading code (orthogonal spreading code) and an amplification unit 11d that amplifies the spread-modulated signal are provided. That is, the transmission signal generated by the transmission data processing section 11a is primary-modulated by the primary modulation section 11b by a predetermined modulation scheme, and then spread by the spreading code by the spreading section 11c. After that, the signal is amplified by the amplifying unit 11 d and radiated from the antenna 13 as a radio wave.
- a spread code composed of a combination of a channelization code and a scramble code is used as the spread code, and the spread code used for communication with the base station 30 is used.
- a spreading code orthogonal to the above is allocated to communication in the ad hoc network.
- the receiver 12 includes a band-pass filter 22 a that removes unnecessary noise components included in the received signal received from the antenna 13, and a base-band signal that passes the band-pass filter 22 a.
- a demodulation unit 22b for demodulating the signal into a signal, a channel estimation unit 22c for obtaining a channel estimation value from a midamble included in the baseband signal, a channel estimation value of each wireless communication device, and a spreading code are used.
- Signal removal unit that removes the interference signal by joint detection (Joint Detection) (Interference signal removing means) 22 d and a reception data processing unit 22 e that performs various processes based on the demodulated signal from which the interference signal has been removed.
- a unique midamble is assigned to each of the wireless communication devices 10 and 20 in advance, and it is possible to derive a channel estimation value of each of the wireless communication devices from the mitten included in the received signal.
- the interference signal elimination unit 22 d generates a system matrix by convolution-multiplying the spread code assigned to each wireless communication device and the above-described channel estimation value, and multiplies this system matrix by a base-span signal. By doing so, a demodulated signal is obtained.
- the control unit 14 controls the transmitter 11 and the receiver 12 based on various information stored in the storage unit 15.
- the control unit 14 controls the switching between transmission and reception. Control, transmission power output control (power control), switching control between the ad hoc network and the mobile communication network, and synchronization control. For example, when communicating with a base station 30 in a mobile communication network or another wireless communication device in an ad hoc network using a wireless line, switching between transmission and reception is performed based on a preset time slot assignment. Is performed, and communication is performed in the TDD system.
- the magnitude of the interference signal is measured for each of the time slots set in the uplink and downlink of the mobile communication network. On the basis of the measured value, processing for selecting a time slot to be used for communication in the ad hoc network is performed. Further, when communicating with another wireless communication device in the ad hoc network, the mobile station, based on the synchronization information received from the base station 30, may be configured to make an ad hoc communication match with the communication timing in the mobile communication network. Communication timings with other wireless communication devices in the network are set. Further, when communicating with another wireless communication device in the ad hoc network, an interference level is detected from a received signal input to the receiver 12, and transmission power is adjusted according to the interference level. ing.
- the wireless communication device 10 Is described as a node X, a wireless communication device that manages the entire ad hoc network is called a master ′, and a wireless communication device that performs wireless communication under the management of the master is called a slave.
- This processing is performed, for example, when the SIR (Signal to Interference Ratio) of the ad hoc network is stronger than that of the mobile communication network, or when the communication mode is switched to the ad hoc mode. Be started.
- SIR Signal to Interference Ratio
- the node searches for a master in the ad hoc network, and sets the node type of the node X to either the master or the slave based on the search result. I do. That is, node X performs a process of detecting a pilot signal emitted from the master, and as a result, if a pilot signal can be detected, the node type is set to slave, and if the pilot signal cannot be detected, Sets the node type to master.
- node X uses node information (for example, node X ID, address, etc.) using a preset shared channel (Common Channel). ) Is transmitted to the master.
- the master receives the node information of the node X
- the network information node information of each slave, network resources, QoS (Quality of Service) parameters, etc.
- the network information is distributed to each slave (including node X) in the ad hoc network.
- node X is brought into the ad hoc network as a slave.
- the node type when the node type is set to the master, the node repeatedly transmits (broadcasts) the pilot signal at predetermined intervals, and periodically monitors the control signal output from the slave. It performs the process of updating network information and the process of detecting the communication status of the slave.
- an ad hoc network with Node X as the master is constructed, and the maintenance of the ad hoc network is performed by Node X.
- node X becomes slave
- the node when the node starts communication with another wireless communication device (hereinafter, referred to as a node Y) set as a slave, first, the node X communicates with the communication partner. Performs processing to transmit the communication request message to the master by specifying the ID of the node Y.
- the master refers to the network information in the storage unit to check the communication status of the node Y, and to check the network resources available for communication (for example, frequency band, spreading code, time slot, etc.). Is confirmed, and processing for allocating a communication channel between nodes X and Y is performed based on the network resources.
- the master generates an interference signal (a signal from the mobile station in the mobile communication network, a signal from the base station 30) for each time slot set in the uplink and the downlink of the mobile communication network.
- an interference signal (a signal from the mobile station in the mobile communication network, a signal from the base station 30) for each time slot set in the uplink and the downlink of the mobile communication network.
- the time slot with the smaller amount of interference (Public Interference Power) is preferentially selected as the time slot used for communication in the ad hoc network.
- the magnitude of the interference signal is measured only for the time slot set for the downlink, and if the measured value is larger than a preset threshold, the It is also possible to adopt a method of selecting a set time slot or, if small, a time slot set for a downlink as a time slot used for communication in an ad hoc network. Further, in this embodiment, as a time slot used for communication in the ad hoc network, a time slot with a smaller amount of interference is preferentially selected.
- each node of the ad hoc network If it is required to improve the communication characteristics of the whole network more than improving the time slot, it is preferable to preferentially select the time slot with the larger amount of interference, contrary to the above. By doing so, each node on the downlink of the mobile communication network can The amount of interference can be reduced, thereby improving the communication characteristics of the entire network.
- the master After allocating the communication channel in this manner, the master returns the setting information to which the communication channel allocation is specified to the node X to which the communication request has been issued. At this time, the master updates the network information based on the setting information and stores it in the storage unit, and distributes the updated network information to each slave in the ad hoc network.
- the node X When receiving the setting information required for communication with the node Y from the host, the node X stores the setting information in the storage unit 15, and then transmits the data signal directly to the node Y according to the setting information. Start sending and receiving. At this time, Node X performs power control so as not to interfere with nearby wireless communication devices that have not joined the ad hoc network. That is, the interference levels of all time slots are measured based on the received signal input to the receiver 12 and the sum of the measured value and a preset offset value is calculated as the maximum value of the transmission power (permissible value). Value), the output power of the transmission power is controlled so as not to exceed this maximum value.
- the node X receives the signal from the base station 30 and extracts information for synchronization included in a predetermined time slot of the received signal. Based on the information for synchronization, the node X Perform processing to set the communication timing with node Y so that it matches the communication timing.
- the node X performs a process of removing an interference signal other than the desired signal transmitted from the node Y when communicating with the node Y.
- the interference signal to be removed is different between the downlink and the uplink in the mobile communication network. That is, in the downlink, as shown in FIG. 8A, an interference signal is generated by a transmission signal from each node (wireless communication devices 10 and 20) in the ad hoc network and a transmission signal from the base station 30. Is configured.
- the channel impulse response (Channel Impulse Response) to the transmission signal from each node in the ad hoc network is likely to be flat fading because the communication distance is relatively short and multipath hardly occurs.
- the transmission signal from the base station 30 has a longer communication distance than the distance between the nodes in the ad hoc network, so that the channel impulse response shows multipath fuzzing.
- the received signal of the node X in the downlink is, for example, as shown in FIG. 8B.
- a signal (desired signal) from the node Y as a communication partner and another node in the ad hoc network are used. (Eg, nodes A and B) and the channel estimation value of the signal from base station 30 are obtained.
- a signal to be removed is selected as an interference signal.
- the signal from the base station 30 is a signal having multipath fading characteristics as described above, it is a target to be removed as an interference signal.
- signals from other nodes in the ad hoc network are not removed if the orthogonality between spreading codes is maintained. However, if the synchronization is lost and the orthogonality is poor, the signal becomes an interference signal and is removed.
- the size of the ad hoc network is large, the signal from a distant node has a relatively large delay spread, and a delayed wave exceeding the spreading code length may arrive together with a direct wave. In this case, similarly to the signal from the base station 30, multipath fuzzing occurs and inter-path interference occurs, so that the signal is removed as an interference signal.
- the interference signal is removed by performing joint detection using the selected interference signal, the channel estimation value of the desired signal, and the spreading code.
- the SIR increases and the reception characteristics improve.
- an interference signal is composed of a transmission signal from each node in the ad hoc network and a transmission signal from a mobile station in the mobile communication network.
- the channel impulse response to the transmission signal from each node in the ad hoc network has a relatively short communication distance and is unlikely to cause multipath, and thus tends to be flat fading.
- the channel impulse response of the transmission signal from the mobile station indicates flat fading or multipath fading depending on the communication distance.
- the transmission power of the mobile station is relatively smaller than the transmission power of the base station 30, the propagation distance of the transmission signal is shorter than that of the base station 30.
- the reception signal of node X in the uplink is as shown in FIG. 9B.
- a signal to be removed is selected as an interference signal.
- signals from other nodes in the ad hoc network are not removed if orthogonality between spreading codes is maintained. However, if the synchronization is lost and the orthogonality is poor, or if the ad hoc network is large and the amount of delay exceeds a predetermined amount (1 chip), it becomes an interference signal and is subject to removal.
- signals from mobile stations in a mobile communication network have different fading characteristics from signals from other nodes in the ad hoc network.
- signals from other nodes in the ad hoc network have different fading characteristics from signals from other nodes in the ad hoc network.
- these signals have different propagation times and are out of synchronization, they all become interference signals and are therefore subject to cancellation.
- the interference signal is selected in this way, the interference signal is removed by performing joint detection using the interference signal, the channel estimation value of the desired signal, and the spreading code. As a result, the SIR increases and it is possible to prevent reception characteristics from deteriorating.
- the same frequency band is adopted by adopting a common TDD-CDMA system for communication in the ad hoc network and the mobile communication network. Since it is used, it becomes possible to provide a wireless communication device 10 that can be connected to both the ad hoc network and the mobile communication network at a low cost with a simple configuration.
- interference signals other than the desired signal included in the received signal are removed, so a common TDD-CDMA system is used for communication between the ad hoc network and the mobile communication network. Even when the same frequency band is used, it is possible to suppress the deterioration of the reception characteristics due to the interference signal, and to avoid a decrease in the communication capacity of the entire network.
- the magnitude of the interference signal is measured, and based on the measured value, The time slot with the smaller amount of interference is selected as the time slot to be used for communication within the ad hoc network, and the output power of the transmission power is controlled according to the measured value. Interference is further less likely to occur between the mobile network and the mobile network, and a good communication state can be ensured regardless of which network is used.
- the wireless communication devices 10 and 20 in the ad hoc network communicate with each other, the load on the mobile communication network can be reduced. Not only can it increase efficiency, but it can also increase network capacity.
- the wireless communication devices 10 and 20 in the ad hoc network communicate with each other, the load on the mobile communication network can be reduced. Not only can it increase efficiency, but it can also increase network capacity.
- the wireless communication devices 10 and 20 in the ad hoc network communicate with each other, the load on the mobile communication network can be reduced. Not only can it increase efficiency, but it can also increase network capacity.
- TDD-CDMA system for communication between the ad hoc network and the mobile communication network
- the interference signal elimination means includes a cellular phone for obtaining data of a signal (hereinafter, referred to as a cellular user signal) from a base station or a mobile station of a mobile communication network and a channel impulse response.
- a cellular signal regenerating unit that generates a replica of the cellular user signal using the signal detection unit 41 and the data of the cellular user signal and the channel impulse response.
- Generating unit 42 memory 43 for temporarily storing the received signal, computing unit 44 for performing arithmetic processing to subtract the replica of the cellular user signal from the received signal, and received signal from which the cellular signal has been removed And an ad hoc signal detection unit 45 for detecting a desired signal from
- the interference signal removing means first, a received signal is input to the cellular signal detection unit 41 and the memory 2543, respectively.
- the cellular signal detector 41 detects only the cellular user signal from the received signal using the joint detection, and performs processing for obtaining the data of the cellular user signal and the channel impulse response.
- the cellular signal regenerating section 42 uses the data of the cellular user signal received from the cellular signal detecting section 41 and the channel impulse response to generate a cell signal. A process of generating a replica of the error user signal is performed.
- the received signal is input from the memory 14 to the arithmetic unit 44, and a replica of the cellular user signal is input from the cellular signal regenerating unit 42 to the arithmetic unit 44.
- a process of removing the interference signal from the mobile communication network is performed.
- the ad hoc signal detection unit 45 performs a process of detecting a desired signal (a signal from a communication partner node in the ad hoc network) from the received signal from which the cellular user signal has been removed.
- signals from each node in the ad hoc network are mainly affected by flat fusing, so that data can be detected by a general demodulation method.
- the detection of the data is detected using the joint detection. As a result, a signal of a desired ad hoc user without interference from the mobile communication network can be obtained.
- the interference signal removing means even in an area where the interference from the mobile communication network is strong, the influence of the interference can be significantly suppressed. For this reason, for example, in a wireless communication system that spreads using a scramble code and a channelization code, when different scramble codes are assigned to a mobile communication network and an ad hoc network, the mobile communication The same channelization code as the channelization code used in the network can be assigned to the communication channel in the ad hoc network, and all the channelization codes can be used for communication in the ad hoc network. It will be. Therefore, it is possible to greatly increase the communication capacity of the entire ad hoc network.
- the uplink of the mobile communication network is used.
- time slot By comparing the time slots set for (Uplink) and the time slots set for the downlink (Downlink), one of the time slots is used for communication within the ad hoc network (hereinafter referred to as the time slot). This is referred to as a time slot for ad hoc communication.) In the third embodiment, however, A time slot that satisfies the set conditions is selected as a time slot for ad hoc communication.
- a wireless communication device that manages the entire ad hoc network assigns a communication channel to a mobile communication network.
- the magnitude (interference power) of the interference signal (the signal from the mobile station in the mobile communication network, the signal from the base station 30) is measured, and By comparing the measured value with a preset threshold value, it is determined whether or not the interference power in each time slot is equal to or less than the threshold value, and as a result of the determination, the interference power in the time slot set for the upstream line is determined as the threshold value.
- the time slot set for the downlink is assigned as the time slot for ad hoc communication. That one, when the interference power time slots configured as uplink you exceed the threshold, performs the process of excluding the time slots configured as the downlink from time slots of Adohokku communication. Also, as a result of the above determination, when the interference power of the time slot set for the downlink is equal to or less than the threshold, the time slot set for the uplink is assigned as the time slot for ad hoc communication, while the time slot is set for the downlink. If the interference power of the assigned time slot exceeds the threshold, a process of excluding the time slot set for the uplink from the time slot for ad hoc communication is performed.
- the interference power (Interference Power) in the time slot set in the uplink of the mobile communication network is equal to or less than the threshold (threshold), and the time slot set in the downlink is If the interference power at is less than or equal to the threshold, both downlink and uplink time slots are assigned as time slots for ad hoc communication.
- the distance to the mobile station is estimated from the interference power in the uplink in the wireless communication device constituting the ad hoc network. It is possible to estimate the distance to the base station from the interference power in the downlink.
- the interference received from the ad hoc network on the downlink increases, and when the distance between the ad hoc network and the base station is short, the interference received from the ad hoc network on the uplink in the base station increases.
- the time slot set for the downlink By using this for communication within an ad hoc network, the effect of communication within the ad hoc network on mobile stations can be reduced.
- the interference power in the time slot set for the downlink is less than or equal to the threshold and the ad hoc network and the base station are estimated to be at least a certain distance apart, the time set for the uplink By using the slots for communication in the ad hoc network, the influence of the communication in the ad hoc network on the base station can be reduced.
- the threshold value is set in advance to a value that does not affect other wireless communication devices outside the ad hoc network even when communication is performed within the ad hoc network.
- This threshold can be determined, for example, based on the reliability and pit rate required for the system, the number of users to use, and the like, and should be stored in advance in a wireless communication device that can be a master.
- the wireless communication device set as the master may acquire information necessary for determining the threshold value from the base station and update the information as appropriate.
- the threshold the same value may be used for the uplink and the downlink, or different values may be used according to the difference in required performance required for each line.
- the magnitude of the interference signal is measured for each of the time slots set in the uplink and the downlink of the mobile communication network, and the measured value is set to a predetermined threshold.
- Time slots to be used for communication in the ad hoc network are determined individually, so that at most both uplink and downlink time slots are used for communication in the ad hoc network.
- the ad hoc network Communication efficiency within the office It becomes possible.
- the downlink is often larger, so for example, communication in an ad-hoc network
- the uplink and the downlink can be used. Such problems are unlikely to occur and communication can be performed efficiently.
- the first wireless communication device 10 has a transmitter 11, a receiver 12, an antenna 13, a control unit 14, and a storage unit 15, as in the first to third embodiments.
- the control unit 14 when the wireless communication device 10 is set as a master in an ad hoc network, the control unit 14 functions as a priority order setting unit and a communication channel allocating unit according to the present invention. Specifically, a communication channel that can be dynamically allocated to communication within an ad hoc network is extracted from all communication channels stored in advance in the storage unit 15 or the like. Then, for the extracted communication channel, a process of setting an allocation priority based on a predetermined evaluation criterion relating to communication conditions is executed. Then, when there is a communication channel allocation request from the slave, the communication channel is allocated based on the priority of the above allocation, and a process of notifying the slave of the communication channel is executed. That is, in the present embodiment, the communication channel allocating device according to the present invention is configured by the control unit 14.
- the first wireless communication device 10 will be described as a node X.
- This processing is started, for example, when the SIR (signal-to-interference ratio) of the ad hoc network is stronger than that of the mobile communication network, or when the communication mode is switched to the ad hoc mode.
- SIR signal-to-interference ratio
- node X searches for a master in the ad hoc network. Then, based on the search result, a process of setting the node type of the node X to one of a cell and a slave is performed. That is, when node X performs a process of detecting a pilot signal emitted from the master station, and as a result, a pilot signal can be detected, the node type is set to slave and no pilot signal can be detected. , Set the node type to master.
- node X transmits node information (eg, node X ID, address, etc.) to the master using a preset shared channel. Is performed.
- the master Upon receiving the node information of the node X, the master updates the network information (node information of each slave, network resources, QoS parameters, etc.) in the storage unit based on the node information, and then updates the network. Performs the process of distributing information to each slave (including node X) in the ad hoc network. As a result, node X is incorporated into the ad hoc network as a slave.
- the node X when the node type is set to the master, the node X repeatedly transmits a pilot signal at predetermined intervals, and periodically monitors the control signal output from the slave while periodically transmitting the network information. It performs the process of updating and the process of detecting the communication status of the slave.
- an ad hoc network is constructed with node X as the main node, and maintenance of the ad hoc network is performed by node X.
- node X when node X is set as a slave, when the node X starts communication with another wireless communication device (hereinafter, referred to as node Y) set as a slave, first, Then, the node X performs a process of designating the ID of the node Y as a communication partner and transmitting a communication channel assignment request to the master using the shared channel.
- the master refers to the network information in the storage unit, checks the communication state of the node Y, and executes a process of assigning a communication channel between the nodes X and Y.
- communication channels that can be newly assigned to communication between nodes X and Y are selected.
- Channels communication channels that have not yet been allocated among communication channels that can be dynamically allocated to communications in an ad hoc network
- predetermined evaluation criteria related to communication conditions
- the communication channel used for communication between nodes X and Y is assigned based on the above-mentioned assignment priority.
- the network resources allocated as communication channels include time slots and spreading codes.
- a time slot is obtained by dividing a TDD-CDMA radio frame into a plurality of pieces.
- 15 time slots (ST 1 to ST 15) are provided.
- two types of spreading codes are used: scrambling codes and channelization codes.
- the scramble code is an identification code assigned to each cell of the mobile communication network.
- a code different from the code assigned to each cell is assigned as a common identification code for the ad hoc network.
- the channelization code used in the ad hoc network uses an OVSF (orthogonal variable spreading factor) code with a spreading factor of 16.
- the channelization code includes a channelization code previously secured as a fixed code for a control signal (for example, a pilot signal, a synchronization signal, a channel request signal, etc.) exchanged between the master and the slave. It includes a channelization code that can be used freely for data signals exchanged between them.
- C0 is used as a channelization code for a control signal
- C1 to C15 is used as a channelization code for a data signal
- channelization codes C1 to C15 are used. It is used as a spreading code that can be dynamically assigned to communications in a hoc network.
- the predetermined evaluation criterion related to the communication condition examples include an evaluation criterion related to an interference state, a network configuration, and a load condition.
- the interference level in each time slot is used as an evaluation criterion for the interference state. That is, the master measures the interference level in each time slot of TDD-CDMA, and determines the priority of allocation so that the lower the communication level is, the higher the communication channel is. For example, as shown in FIG. 12, when an ad hoc network is constructed near the base station 30 of the mobile communication network, the interference level in the time slot set for the downlink of the mobile communication network is reduced. And the interference level tends to be relatively low in the time slot set for the uplink. On the other hand, as shown in Fig. 13, when the ad hoc network is constructed at a position distant from the base station 30, the interference level in the uplink set for the mobile communication network in the uplink is reduced. And the interference level tends to be relatively low in the time slot set for the downlink.
- the time slots ST 6, 9, 12 and 15 are set to the higher priority.
- the time slots ST4, 5, 7, 8, 10, 0, 11, 13, and 14 are set to higher priority in the example of Fig. 13. Is done.
- time slot allocated to communication in the ad hoc network dynamically changes depending on the position of the ad hoc network in the cell, the line direction of the mobile communication network, and the like.
- time slots (ST 1, 2, 3) used for exchanging control signals in a mobile communication network such as BH (Broadcast Channel) and FA (Forward Access Channel) are described.
- BH Broadcast Channel
- FA Forward Access Channel
- evaluation criteria related to the network configuration include, for example, (1) a communication channel used for uplink and downlink bidirectional communication, and (2) a communication channel assigned when one node communicates with a plurality of nodes.
- evaluation criteria such as channels, which are distinguished based on whether communication channels to be allocated satisfy specific conditions. It is.
- the master preferentially allocates a pair of communication channels having the same spreading code and different time slots as communication channels used in uplink and downlink bidirectional communication.
- ⁇ executes a process of suppressing or removing an interference signal in the ad hoc network by joint detection.
- the maximum number of channelization codes that can be used simultaneously in one time slot is about 10 to 12 at the maximum, but this channelization code allocation can be aggregated into as few time slots as possible.
- the channelization code reaches the upper limit in a certain time slot, it is preferable to allocate the channelization code in another time slot.
- a communication channel having the same time slot and a different spreading code is prioritized as the communication channel.
- the number of time slots used by each node is determined by multiplexing traffic using different channelization codes in the same time slot. Is suppressed.
- Node A communicates with Nodes B, C, and D under the situation where Node B and Node D communicate using time slots ST5 and ST7.
- FIG. 14B communication between nodes ( ⁇ ⁇ B, B ⁇ A, A ⁇ All necessary communication channels can be allocated in C, C ⁇ A, A ⁇ D, D ⁇ A), and the number of time slots used can be minimized.
- the master After setting the priority and assigning the communication channel in this way, the master sends the setting information in which the assignment of the communication channel is specified to the node X that has requested the communication. And reply. At this time, the master updates the network information based on the setting information and stores the updated network information in the storage unit, and distributes the updated network information to each slave in the ad hoc network. .
- the node X When receiving the setting information required for communication with the node Y from the host, the node X stores the setting information in the storage unit 15, and then transmits the data signal directly to the node Y according to the setting information. Send and receive. At this time, the node X performs power control so as not to interfere with a nearby wireless communication device that is not participating in the ad hoc network. That is, the interference levels of all the time slots are measured based on the received signal input to the receiver 12 and the sum of the measured value and a preset offset value is calculated as the maximum transmission power (allowable value). The output power of the transmission power is controlled so as not to exceed this maximum value.
- the node X receives the signal from the base station 30, extracts information for synchronization included in a predetermined time slot of the received signal, and, based on the information for synchronization, transmits a signal to the mobile communication network. Based on the process of setting the communication timing with node Y so that it matches the communication timing, and based on the midamble included in the received signal, the channel estimation values of the desired signal transmitted from node Y and other interference signals are calculated. Then, using the channel estimation value and the spreading code assigned to each signal, a process for removing the interference signal by joint detection is performed.
- NAK Negative Acknowledge
- node Y and node X Executes processing in which the master relays the data signal exchanged with the master. That is, the master allocates a communication channel between itself and node X and a communication channel between itself and node Y, and acquires a data signal transmitted from node X or node Y using the communication channels. This is transferred to node Y or node X. Therefore, the master can be used as a relay device in the ad hoc network, and as a result, the usable range of the ad hoc network can be expanded.
- NAK Negative Acknowledge
- the master periodically inquires the communication status of nodes X and Y, confirms the completion of communication between nodes X and Y based on the response, and then checks the status of nodes X and Y. After releasing the communication channel allocated for inter-communication, updates the network information and stores it in the storage unit, and distributes the updated network information to each slave in the ad hoc network I do.
- a communication channel that can be dynamically allocated to communication in an ad hoc network is extracted from all communication channels registered in advance, and the extracted communication channel is extracted.
- Assignment priorities are set for channels based on predetermined evaluation criteria relating to communication conditions, and when a communication channel assignment request is made, communication channels are assigned based on the assignment priorities. Therefore, even in a network environment where an ad hoc network and a mobile communication network coexist, it is possible to allocate communication channels according to communication conditions (for example, network configuration, load status, interference state, etc.). This makes it possible to improve the efficiency and optimization of communication in ad hoc networks.
- an interference level in each time slot of TDD-CDMA is measured, and the priority of the above allocation is set so that a communication channel having a lower interference level has a higher rank. Therefore, even when the same frequency band is used by adopting a common TDD-C DMA method for communication between the ad hoc network and the mobile communication network, mutual interference between the two networks can be suppressed. As a result, a good communication state can be ensured, and a decrease in throughput communication capacity can be avoided.
- a common TDD-CDMA scheme is used for communication in an ad hoc network and communication between a base station and a mobile station in a mobile communication network, and the same frequency band is used.
- the present invention is not limited to this.
- the communication system used in the adhoc network and the mobile communication network is a common communication system based on TDD, for example, TDD-TDMA Scheme or TDD-OFDM scheme.
- TDD—TDMA stands for Time Division Multiple Access (TDMA), which uses the TDD scheme for the duplex scheme.
- TDMA is a multiple scheme in which the same frequency band is alternately shared by multiple callers for short periods of time. Connection method. For example, PHS (Personal Handyphone) System).
- TDD— ⁇ FDM is Orthogonal Frequency Division Multiplexing (OFDM), which uses the TDD scheme for the return scheme. OFDM is the frequency at which the intensity of the modulated spectrum becomes zero.
- OFDM Orthogonal Frequency Division Multiplexing
- This is a transmission method in which multiple carriers are arranged at intervals (so that each spectrum is orthogonal to each other). In this transmission method, one or more carriers are allocated to each caller.
- the same frequency band is used by adopting a common TDD-CDMA system for communication in the ad hoc network and the mobile communication network, so that connection to both the ad hoc network and the mobile communication network is possible.
- a simple wireless communication device can be provided at a low cost with a simple configuration. Further, mutual interference between the ad hoc network and the mobile communication network can be reduced, and a good communication state can be ensured regardless of which network is used.
Abstract
Description
Claims
Priority Applications (2)
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US10/559,278 US20060215611A1 (en) | 2003-06-05 | 2004-06-02 | Radio communication apparatus, radio communication method, communication channel assigning method and assigning apparatus |
EP04735811A EP1631109A1 (en) | 2003-06-05 | 2004-06-02 | Radio communication apparatus, radio communication method, communication channel assigning method and assigning apparatus |
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JP2003-160576 | 2003-06-05 | ||
JP2003160576A JP4029778B2 (ja) | 2003-06-05 | 2003-06-05 | 無線通信装置および無線通信方法 |
JP2003-295311 | 2003-08-19 | ||
JP2003295311A JP2005065101A (ja) | 2003-08-19 | 2003-08-19 | 無線通信装置および無線通信方法 |
JP2003-329765 | 2003-09-22 | ||
JP2003329765A JP2005101716A (ja) | 2003-09-22 | 2003-09-22 | 通信チャネルの割当方法および割当装置、無線通信装置 |
JP2003331648 | 2003-09-24 | ||
JP2003-331648 | 2003-09-24 | ||
JP2004047574A JP2005124121A (ja) | 2003-09-24 | 2004-02-24 | 無線通信装置 |
JP2004-047574 | 2004-02-24 | ||
JP2004148914A JP2005333325A (ja) | 2004-05-19 | 2004-05-19 | 無線通信装置 |
JP2004-148914 | 2004-05-19 |
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US20060215611A1 (en) | 2006-09-28 |
KR20060022259A (ko) | 2006-03-09 |
EP1631109A1 (en) | 2006-03-01 |
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