WO2007105685A1 - 通信装置および通信方法 - Google Patents
通信装置および通信方法 Download PDFInfo
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- WO2007105685A1 WO2007105685A1 PCT/JP2007/054825 JP2007054825W WO2007105685A1 WO 2007105685 A1 WO2007105685 A1 WO 2007105685A1 JP 2007054825 W JP2007054825 W JP 2007054825W WO 2007105685 A1 WO2007105685 A1 WO 2007105685A1
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/12—Arrangements for detecting or preventing errors in the information received by using return channel
- H04L1/16—Arrangements for detecting or preventing errors in the information received by using return channel in which the return channel carries supervisory signals, e.g. repetition request signals
- H04L1/18—Automatic repetition systems, e.g. Van Duuren systems
- H04L1/1825—Adaptation of specific ARQ protocol parameters according to transmission conditions
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W74/00—Wireless channel access, e.g. scheduled or random access
- H04W74/002—Transmission of channel access control information
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
- H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
- H04B7/0413—MIMO systems
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/12—Arrangements for detecting or preventing errors in the information received by using return channel
- H04L1/16—Arrangements for detecting or preventing errors in the information received by using return channel in which the return channel carries supervisory signals, e.g. repetition request signals
- H04L1/18—Automatic repetition systems, e.g. Van Duuren systems
- H04L1/1867—Arrangements specially adapted for the transmitter end
- H04L1/1893—Physical mapping arrangements
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L5/00—Arrangements affording multiple use of the transmission path
- H04L5/0091—Signaling for the administration of the divided path
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L61/00—Network arrangements, protocols or services for addressing or naming
- H04L61/50—Address allocation
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L61/00—Network arrangements, protocols or services for addressing or naming
- H04L61/50—Address allocation
- H04L61/5038—Address allocation for local use, e.g. in LAN or USB networks, or in a controller area network [CAN]
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/12—Arrangements for detecting or preventing errors in the information received by using return channel
- H04L1/16—Arrangements for detecting or preventing errors in the information received by using return channel in which the return channel carries supervisory signals, e.g. repetition request signals
- H04L1/18—Automatic repetition systems, e.g. Van Duuren systems
- H04L1/1812—Hybrid protocols; Hybrid automatic repeat request [HARQ]
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L5/00—Arrangements affording multiple use of the transmission path
- H04L5/0001—Arrangements for dividing the transmission path
- H04L5/0003—Two-dimensional division
- H04L5/0005—Time-frequency
- H04L5/0007—Time-frequency the frequencies being orthogonal, e.g. OFDM(A), DMT
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L5/00—Arrangements affording multiple use of the transmission path
- H04L5/003—Arrangements for allocating sub-channels of the transmission path
- H04L5/0037—Inter-user or inter-terminal allocation
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W8/00—Network data management
- H04W8/26—Network addressing or numbering for mobility support
Definitions
- the present invention relates to optimization of information amount necessary for adaptive modulation control.
- IMT-2000 International Mobile Telecommunication 2000
- HSDPA High Speed Down-link Packet Access
- a requirement necessary to realize wireless communication at a high transmission rate is to improve the frequency utilization efficiency. Since the transmission rate and the bandwidth to be used are in a proportional relationship, increasing the frequency bandwidth to be used is a simple solution to increase the transmission rate. However, the frequency bands that can be used are tight, and it is unlikely that sufficient bandwidth will be allocated to construct a new wireless communication system. Therefore, it is necessary to improve the frequency utilization efficiency.
- Another requirement is that services in a private area (isolated cell) such as a wireless LAN can be seamlessly provided while providing services in a communication area composed of cells such as mobile phones. It is to be.
- OFDMZFDMA Orthogonal Frequency Division Multiplexing / Frequency Division Multiple Access
- OFDMA Orthogonal Frequency Division Multiplexing / Frequency Division Multiple Access
- TDMA Time Division Multi pie Access
- FDMA Frequency Division Multiple Access
- an isolated cell is a communication method that can realize higher-speed data communication while having a wireless interface common to the cell area.
- OFDM is a method used in IEEE802.11a, a 5 GHz band wireless system, and digital terrestrial broadcasting.
- OFDM is a system in which several tens of thousands of carriers are arranged at the minimum frequency interval where no interference occurs theoretically and are communicated simultaneously.
- this carrier is called a subcarrier, and each subcarrier is digitally modulated such as PSK (Phase Shift Keying) and QAM (Quadrature Amplitude Modulation) for communication.
- PSK Phase Shift Keying
- QAM Quadrature Amplitude Modulation
- FDMA is a method of dividing and accessing a frequency when transmitting and receiving data.
- a frequency is divided into several bands, and a terminal to be accessed is distinguished by dividing a frequency band for communication.
- a guard band called a guard band is prepared between the divided frequency bands.
- the guard band is not used or the number of subcarriers is not used because it does not impair the frequency utilization efficiency.
- the bandwidth is extremely narrow.
- each terminal reports CQI (Channel Quality Information) of each channel to the base station, and the base station is the best for each terminal.
- CQI Channel Quality Information
- Patent Document 1 Special Table 2002-539686
- Patent Document 2 Special Table 2004-510358
- Patent Document 3 Japanese Patent Laid-Open No. 2004-179853
- Patent Document 4 Japanese Unexamined Patent Application Publication No. 2004-253914
- Patent Document 5 Special Table 2004-533792
- Patent Document 6 Japanese Unexamined Patent Application Publication No. 2005-86818
- the transmission side inserts flag information indicating function selection information and modulation scheme into the control information and sends it to the reception side.
- the receiving side knows how to receive the information based on the notified flag bit.
- MIMO Multi-Input-Multi-Output
- the flag for MIMO control is controlled even when a certain terminal is moving at high speed and cannot use MIMO. Because it exists in the information, the bit used by that flag was wasted.
- the channel quality is not limited to the case of controlling the channel assignment and modulation method according to the CQI, but the case of establishing a connection (when establishing a connection) or the case of a handover where the connected base station changes. Measuring and sending CQI may also occur. Even in such a case, the transmission side prepares flag bits according to the function selection information and the function indicating the modulation method, and the same problem occurs.
- a wireless communication system including a communication control device (base station) and a plurality of communication terminal devices (terminals), the number of communication terminal devices connected to the communication control device, the processing capacity of the communication control device, Depending on the required communication quality or the status of the communication terminal, the number of terminal temporary identifiers that temporarily identify the communication terminal device and the information required to notify the function to be used The amount of information to be notified varies. However, since the flag bit is fixedly used, it is difficult to flexibly use it according to the communication situation.
- the present invention has been made in view of such circumstances, and an object thereof is to provide a technique for optimizing the amount of information necessary for adaptive modulation control.
- a communication apparatus is a communication apparatus that assigns a terminal identifier to a communication destination apparatus and communicates with the communication destination apparatus using a plurality of functions. Therefore, an identifier allocating unit that generates different terminal identifiers corresponding to functions used for communication selected from the plurality of functions and allocates them to the communication destination device is provided.
- a communication destination device and a plurality of functional capabilities are identified using a plurality of different terminal identifiers (terminal function identifiers).
- terminal function identifiers terminal function identifiers
- the communication device prepares multiple terminal identifiers for each function to be used for communication selected from multiple functions for each communication destination device (for each function combination), and uses it for communication with the communication destination device.
- the terminal identifier is changed according to the function to be performed.
- the identifier assigning unit is a component that realizes the function of the identifier generating unit that generates the terminal identifier group and the function of assigning the terminal identifier to the communication destination device, and selects one terminal identifier from a plurality of terminal identifiers. Includes the function of the identifier selector.
- the terminal identifier includes at least a region depending on a function.
- the terminal identifier includes at least a region depending on the function, it is possible to specify the communication destination device and the function.
- the identifier assigning unit has different terminals corresponding to a communication destination device and a plurality of functions used for communication selected from the plurality of functions. An identifier is generated and assigned.
- the identifier assigning unit generates a terminal identifier corresponding to a function. That is, a terminal identifier (terminal function identifier) is generated according to each function for one communication destination device.
- the function used for communication selected from the plurality of functions can be specified by the terminal identifier.
- the terminal identifier adds information that identifies the function used by the communication destination device in addition to the function of identifying the terminal that is the communication destination device. This is the same as adding an attribute specifying the function to the identifier for identifying the terminal.
- the function to be specified is which function of a plurality of functions is used, and which of the selection items included in the function used for the selected communication function is selected. Two things are added: whether to use eyes.
- the amount of information necessary for adaptive modulation control can be suppressed by selecting a function used for communication as a selection function from among a plurality of functions.
- the identifier assigning unit generates a group of terminal identifiers corresponding to the function, and creates a duplex corresponding to the function used with the communication destination device.
- a terminal identifier included is assigned to the communication destination device.
- the identifier assigning unit can group a plurality of terminal identifiers (terminal function identifiers) that specify communication destination devices, and assign a function to each group.
- terminal identifiers terminal function identifiers
- the terminal identifier can specify the communication destination device and which function selection item to use.
- the plurality of functions include a modulation scheme type, a coding rate, a number of MIMO (Multi Input Multi Output) communication streams, a number of MIMO communication antennas, It includes at least one of ARQ (Automatic Repeat reQuest) type, number of accommodated communication devices, and CQI (Channel Quality Information) notification method.
- a modulation scheme type a coding rate
- MIMO Multi Input Multi Output
- ARQ Automatic Repeat reQuest
- CQI Channel Quality Information
- the communication device further includes a function selecting unit that selects a predetermined number of functions used for communication, and the identifier assigning unit is based on the selected function.
- a terminal identifier is generated and assigned to the communication destination device.
- the function selection unit can select a selection function based on the communication status. As a result, a more appropriate selection function can be selected, and the amount of information necessary for adaptive modulation control can be optimized.
- the function selection unit includes at least one of the number of communication destination devices to be connected, required communication quality, and information received from the communication destination device. Based on the above, the number of functions to be used is limited.
- the function selection unit determines the function of the communication destination device based on at least one of the number of communication destination devices to be connected, the required communication quality, and the information received from the communication destination device.
- the number of functions to be selected can be limited according to the processing capacity. As a result, a more appropriate number of selection functions can be selected, and the amount of information necessary for adaptive modulation control can be optimized.
- the function selection unit is based on at least one of the number of communication destination devices to be connected, required communication quality, and information received from the communication destination device. It is characterized by selecting a function to be used.
- the function selection unit selects the function selection unit based on at least one of the number of communication destination devices to be connected, the required communication quality, and the information received from the communication destination device. You can change the function. Thereby, the selection function can be selected according to the communication status.
- the communication device is a communication device that assigns a terminal identifier to a communication destination device and communicates with the communication destination device using a plurality of functions, wherein the terminal identifier Includes at least a function-dependent area, and the function-dependent area generates different terminal identifiers corresponding to a plurality of functions used for communication selected from the plurality of functions, and the communication destination apparatus And an identifier assigning unit to be assigned to.
- the terminal identifier since the terminal identifier includes an area (mode number) depending on the function, it is possible to identify the communication destination device and the function.
- the terminal identifier includes a terminal temporary identifier for temporarily identifying the terminal, and the region depending on the function includes a plurality of combinations of a plurality of functions. Including a mode number corresponding to each of the above.
- the memory usage can be optimized according to the state of the communication device. Furthermore, since the memory usage state can be changed according to the state of the communication device, the amount of memory allocated to the terminal function identifier can be reduced.
- the identifier assigning unit is based on at least one of the number of communication destination devices to be connected, required communication quality, and information received from the communication destination device. The size of the region depending on the function is determined.
- the identifier assigning unit is an area depending on the function according to a communication situation. Can be flexibly changed. As a result, the memory can be used according to the communication status, and the amount of information necessary for adaptive modulation control can be optimized. In addition, since the memory allocation can be changed according to the communication status, the total amount of memory can be reduced.
- the identifier assigning unit generates and generates function correspondence information associating the function associated with each of the generated plurality of terminal identifiers with the terminal identifier. It further comprises a transmission unit for transmitting the function correspondence information to the communication destination device.
- the communication destination device can acquire information specifying the function added to the terminal identifier (terminal function identifier).
- the identifier assigning unit instructs to transmit the generated function correspondence information to the communication destination device via the transmission unit in order to notify the communication destination device.
- a communication method is a communication method in which a terminal identifier is assigned to a communication destination device and communication is performed with the communication destination device using a plurality of functions. Accordingly, a different terminal identifier is generated and assigned to the communication destination device.
- terminal function identifiers it is possible to specify a communication destination apparatus and a function to be used using a plurality of different terminal identifiers (terminal function identifiers). This makes it possible to optimize the size of the memory that stores information necessary for adaptive modulation control.
- the present invention is applied to a wireless communication system including a communication device that transmits data after adaptive modulation, and a communication device that receives data subjected to adaptive modulation, and a communication device that forms the wireless communication system. can do.
- a communication apparatus that controls adaptive modulation and transmits data is referred to as a communication control apparatus, and adaptive modulation is performed.
- a communication device that receives controlled data will be described as a communication terminal device, but the present invention uses a communication method that performs adaptive modulation control and uses a plurality of functions having a plurality of selection items to communicate with a communication device (communication destination).
- the present invention can be applied to a communication device that communicates with a destination device.
- the communication terminal device may be referred to as “terminal”.
- the communication device selects at least one function from a plurality of functions having a plurality of selection items, and communicates with the communication destination device by using one selection item from the selection items of the function for the selected function. It is assumed that Several functions include modulation type, number of MIMO communication streams, number of MIMO communication antennas, ARQ (Automatic
- the terminal unique identifier is an identifier unique to the terminal and is also referred to as a physical ID.
- a terminal temporary identifier is an identifier that is temporarily assigned to a terminal and is also called a logical ID. It is assigned by the communication control device and is assigned each time the communication terminal device establishes a connection with the communication control device. It is.
- the terminal function identifier is a temporary identifier that associates a communication destination device with a function used for communication, and is generated by the communication control device. Further, in this specification, the terminal identifier is a broad concept including a terminal unique identifier, a terminal function identifier, and other identifiers for identifying a communication destination device.
- the terminal temporary identifier itself includes the communication control device and the communication terminal device. A case where a terminal function identifier to which an attribute of a function used in communication is added will be described.
- FIG. 1 is a block diagram illustrating an example of the configuration of the communication control apparatus 100 according to the first embodiment.
- the communication control unit 101 controls information data via the backbone handled by the communication control apparatus 100 and each block of the communication control apparatus 100.
- the communication control unit 101 has a function of generating a plurality of terminal function identifiers and generating function correspondence information for specifying the correspondence between the plurality of terminal function identifiers and the functions. Will be described later.
- Terminal ID selection section 102 is instructed by a communication destination apparatus (communication terminal apparatus) to transmit data from communication control section 101, and outputs the terminal unique identifier of the corresponding communication terminal apparatus as terminal I blueprint. To do.
- the terminal ID selection unit 102 may output a terminal function identifier as terminal information instead of the terminal unique identifier. This is possible when the terminal function identifier has already been assigned to the communication terminal device of the communication destination and the communication control unit 101 has acquired the terminal function identifier.
- Modulation scheme selection section 103 selects a modulation scheme including modulation scheme, coding scheme, soft handover control on / off, MIMO, and the like according to an instruction from communication control section 101, and selects the selected modulation scheme. Is output as modulation scheme information.
- identifier selection unit 104 selects one selection item from a plurality of selection items included in the selection function, and selects a terminal function identifier associated with the selected selection item. To do. Specifically, based on terminal information (terminal unique identifier or terminal function identifier), modulation scheme information, ARQ control information indicating the type of the selected ARQ, etc. The terminal function identifier corresponding to the function selection item to be used is selected from a plurality of terminal function identifiers. Details will be described later using FIG.
- the control slot generation unit 105 also generates control slot data for the selected terminal function identifier and modulation scheme power.
- the data slot generation unit 106 processes the information data into an appropriate length according to an instruction from the communication control unit, and adds an ARQ control signal and an error detection code.
- the frame data generation unit 107 generates the control slot data and the data slot data generated.
- One hawk also assembles the frame.
- ARQ control section 108 controls ARQ by signals from communication control section 101 and uplink receiving section 112. The control result is output as ARQ control information.
- Mapping section 109 determines which data is assigned to each subcarrier in the generated packet and the selected modulation scheme power.
- Modulation section 110 performs modulation processing based on the data mapping result and the selected modulation method.
- the RF unit 111 converts the modulated wave into a frequency that can also transmit the antenna force, amplifies it to necessary power, and transmits the converted modulated wave.
- the RF unit 111 includes a plurality of antennas.
- the uplink reception unit (reception unit) 112 receives an uplink signal having the power of a communication terminal device.
- the transmission unit 113 has a function of transmitting data to a communication destination device, and has a function including a modulation unit 110 and an RF unit 111 in FIG.
- FIG. 2 is a block diagram illustrating an example of the configuration of the communication terminal device 200 according to the first embodiment.
- the communication control unit 201 controls communication in the communication terminal device 200. Further, the function attribute added to the terminal function identifier is determined, and it is understood what kind of adaptive modulation control is performed on the communication control device 100 side.
- the RF unit 202 extracts a necessary signal from the received signal and converts it into a baseband signal.
- the control slot demodulator 203 demodulates the control slot.
- the data slot demodulator 204 demodulates subsequent data slots based on the demodulation result of the control slot.
- the CQI measurement unit 205 generates reception signal power, quality information of each subchannel, and CQI.
- the ARQ control unit 206 determines which slot can be received and which slot can be received from the demodulated data slot signal, and generates an ARQ control signal to be transmitted to the communication control apparatus 100.
- Uplink transmission unit 207 transmits data to communication control apparatus 100.
- FIG. 3 is a block diagram showing an example of a configuration relating to generation of a terminal function identifier and an identifier assigning unit 114 among the functions of the communication control unit 101 of the communication control apparatus 100 of the present embodiment.
- the communication control unit 101 includes a function selection unit 151, an identifier generation unit 152, and a function correspondence information management unit 153 as components related to generation of a terminal function identifier.
- the identifier assigning unit 114 assigns a different terminal identifier (terminal function identifier) corresponding to the function to be used. It has a function of generating and assigning to the communication destination device.
- FIG. 3 shows an example realized by the identifier generation unit 152 and the identifier selection unit 104 (including the identifier generation unit 152 and the identifier selection unit 104).
- the function selection unit 151 receives the designated function information notified from the communication terminal device 200, and inputs the designated function information, the processing capability of the communication control device 100, the communication status (congestion status, channel quality, Based on the required communication quality, etc., select at least one function of multiple functional capabilities to determine the selected function, and output information on the selected selected function as selected function information.
- the designated function information is information generated by the communication control unit 201 of the communication terminal apparatus 200, and is information that designates a function that uses a selection item of a plurality of functions as a variable and a function that uses a fixed value.
- the function selection unit 151 selects an appropriate function as the selected function based on other factors such as the communication status and the capability of the communication control device 100. can do. In addition, the function selection unit 151 can adjust the number of functions to be selected as the selection function.
- the generated selection function information is output to the identifier generation unit 152.
- FIG. 3 shows the case where the designated function information is notified from the communication terminal apparatus 200, but it is selected in the communication control apparatus 100 where the designated function information is not notified from the communication terminal apparatus 200. You can select a function.
- the identifier generation unit 152 generates a plurality of different terminal function identifiers. Specifically, the terminal function identifier is generated based on the selected function information selected by the function selection unit 151. Specifically, the identifier generation unit 152 generates a plurality of terminal function identifiers for specifying each of a plurality of selection items included in the selection function for each communication terminal device 200. When there are a plurality of selection functions, a plurality of terminal function identifiers specifying combinations of a plurality of selection items possessed by each of the plurality of selection functions are generated.
- the identifier generation unit 152 generates function correspondence information that associates a selection item associated with each of the generated plurality of terminal function identifiers with the terminal function identifier. Specific examples of the terminal function identifier and the function correspondence information will be described later with reference to FIG.
- the identifier generation unit 152 generates function correspondence information for each communication terminal device 200 to be connected.
- the generated function correspondence information is output to the function correspondence information management unit 153.
- the function correspondence information management unit 153 includes a storage area for storing the function correspondence information generated by the identifier generation unit 152, and stores and manages the function correspondence information in the storage area.
- the function correspondence information management unit 153 receives the notification of the terminal function identifier and outputs the function correspondence information of the notified terminal function identifier.
- FIG. 4 is a block diagram showing an example of the configuration of the identifier selection unit of this embodiment.
- the identifier selection unit 104 includes a first selection unit 161 and a second selection unit 162.
- First selection section 161 receives terminal HD information from terminal ID selection section 102 and terminal terminal function identifier information from communication control section 101.
- Terminal-to-terminal function identifier information is information that associates a terminal unique identifier with a plurality of terminal function identifiers. In this embodiment, since a plurality of terminal function identifiers are assigned to one communication terminal apparatus 200, a plurality of terminal function identifiers correspond to the terminal unique identifier.
- the first selection unit 161 selects a plurality of terminal function identifiers assigned to the communication terminal apparatus 200 based on the terminal HD information and the terminal-terminal function identifier. When one of the terminal function identifiers is notified as terminal HD information, the first selection unit 161 searches for the terminal unique identifier corresponding to the notified terminal function identifier, and corresponds to the searched terminal unique identifier. Multiple terminal function identifiers (terminal function identifier group) to be selected. The selected terminal function identifier group is output to second selection section 162.
- Second selection section 162 is based on modulation scheme information notified from modulation scheme selection section 103, ARQ control information notified from ARQ control section 108, and function control information notified from communication control section 101.
- the terminal function identifier group power notified from the first selection unit 161 also selects one terminal function identifier.
- the function control information is information generated by the communication control unit 101, and is information for controlling the function to be used based on the reception quality information notified from the communication terminal device 200. This is information that specifies which of the items to use. For example, control information such as on / off of soft handover is included.
- FIG. 5 is a block diagram showing an example of the configuration of the conventional logical ID selection unit 163.
- communication terminal device 200 and terminal temporary identifier (logical ID) have a one-to-one relationship, it is based on terminal unique identifier and terminal logical ID correspondence information.
- logical ID terminal temporary identifier
- the identifier selection unit 104 has a configuration example including two selection units for selecting a terminal function identifier.
- the terminal configuration identifier may be determined by inputting all necessary information at once by a single selection unit.
- the identifier selection unit 104 may be a part of the function performed by the communication control unit 101, which may be arranged in the communication control unit 101. Further, the respective components arranged in the communication control unit 101 shown in FIG. 3 are not limited to being arranged in the communication control unit 101, and may be arranged in other places.
- FIG. 6 is a diagram illustrating an example of a frame used in the OFDMA system.
- the frame 500 includes a plurality of slots 502 defined by a certain time length and a certain frequency band.
- OFDMA is an OFDMA-based FDMA system where resources are managed in units of subchannels 501 obtained by dividing subcarriers in a predetermined frequency band, and in some cases, units of slots 502 in which subchannels 501 are further divided in the time direction. Management is performed at.
- an example in which resources are managed using the slot 502 as a minimum unit will be described.
- a control slot 503 which is a control slot for storing allocation information of subsequent slots 502 group and a modulation scheme of each slot 502, is arranged at the head of the frame 500, and then a data slot 502 is arranged.
- the control slot 503 is an area in the frame 500 where the use is determined in advance for control information.
- the control slot 503 is transmitted in a predetermined modulation method, for example, BPSK (Binary Phase Shift Keying), which is most reliable, and the subsequent data slot 502 follows the contents of the control slot 503. It is transmitted with the modulation method.
- BPSK Binary Phase Shift Keying
- a method called “low-powered” is assigned to a certain communication terminal device 200 in the sub-channel direction, that is, the time axis direction. (A method of assigning the area 504 of the lattice pattern portion) or a method called “distributed” assigned in the frequency direction (a method of assigning the region 505 of the hatched portion) is used.
- Low-powered communication terminal equipment 200 The user diversity gain can be increased by allocating slots to subchannels with good characteristics for the communication terminal device 200 using the CQI, which is also reported, and the distributed can use frequency diversity in the allocated slots. You can get an effect.
- Which allocation policy is used is not directly related to the present invention, but as an example, the moving speed of the communication terminal device 200 (mobile terminal) is too fast.
- the accuracy of CQI can be sufficiently secured, a localized value is used.
- the moving speed of the communication terminal device 200 is fast.
- Distributed may also be used for communication terminal devices 200 such as remote sensors, which are extremely low in transmission frequency and do not need to report CQI.
- the distributed area 505 is further divided in the time direction so that the information amount per slot becomes the same as that in the case of the low power rise.
- the localized slot is divided into eight in the frequency direction, so the distributed slot is also divided into eight in the time direction.
- Reference numeral 508 represents the length of one slot in the time axis direction, and indicates that the length indicated by reference numeral 508 is divided into eight equal parts.
- FIG. 7 is a diagram showing an example of functions assigned to terminal function identifiers in the present embodiment.
- Each function shown in Fig. 7 has a selection item for selecting the type of function.
- each function is shown using Flagl to Flag4.
- FIG. 7 shows an example in which the function of Flag3 has four selection items, and the other F1ag functions have two selection items. Selection item of function to be used ( In order to transmit information), Flag3 requires 2 bits, and the other Flags require 1-bit flag bits. Therefore, in this embodiment, four functions are assigned to terminal function identifiers (attributes of four functions are added to the terminal temporary identifier).
- Each function indicates the following contents! /
- the first function is the mouth-level rise Z-distributed switching shown in Flagl
- the second function is the soft handover OnZOff switching shown in Flag2
- the third function is the MIMO shown in Flag3
- the fourth is the switching of the ARQ timeout period shown in Flag 4 to the long Z short. Since each function itself has nothing to do with the essence of the present invention, only a brief description will be given below.
- Soft handover prevents communication from being temporarily interrupted at the time of a node over by communicating with both cells or sectors at the cell or sector boundary at the time of handover that moves between cells or sectors. This technology prevents instability of communication. Depending on the method, it is necessary to operate at least a part of the functions of the receiving unit in order to implement soft node over, which increases the circuit scale and power consumption.
- MIMO uses a plurality of antennas on the transmission side and the reception side, transmits a plurality of signals simultaneously from different antennas on the transmission side, and receives those signals on the reception side using a plurality of antennas.
- each transmission signal is separated from the reception signal by signal processing, and the number of signals that can be separated varies depending on the state of the propagation path between the transmission antenna and the reception antenna.
- the time-out period of ARQ is related to the real-time nature of information. Setting a long time-out period increases the reliability of information, but the real-time nature decreases, and setting the time-out period short reduces the reliability of information. There is a relationship that real-time performance improves.
- FIG. 8 shows an example of selecting and using some functions.
- the communication terminal device 200 moving at high speed does not use MIMO, depending on the moving speed. It is preferred to use only distributed. In such a case, it is sufficient to notify the communication terminal apparatus 200 of the information of Flag2 and Flag4 as shown in FIG. 8, and it is not necessary to notify the information of Flagl and F1ag3.
- MIMO is not used for low bit rate communications such as normal voice calls, and the ARQ timeout period remains set to “short”. In this case, as shown in FIG. 9, information of Flagl and Flag2 may be notified to communication terminal apparatus 200.
- the communication terminal device 200 used as a remote sensor may not actually move.
- the present invention solves this problem.
- the function is distinguished using the terminal function identifier of the communication terminal apparatus 200 that is dynamically added instead of using a flag bit for selection of these functions, and the communication terminal apparatus 200 is notified.
- the terminal temporary identifier (logical ID) of the communication terminal device 200 is an ID (identifier) that is temporarily (temporarily) assigned when the communication terminal device 200 is connected to the communication control device 100, and is uniquely assigned to the communication terminal device 200. If the bit length of the terminal unique identifier (physical ID) is long, it is used to reduce the amount of information. Usually, only one terminal temporary identifier is assigned to one communication terminal device 200, and at most, only a few multicast addresses are assigned. In this embodiment, terminal function identifiers that associate terminal temporary identifiers with functions are generated, and terminal functions are the same as the number of combinations of functions used in communication terminal apparatus 200 (the number of combinations of selection items that each function has). Assign an identifier.
- FIG. 10 is a diagram showing an example in which combinations of function selection items are assigned to terminal function identifiers.
- the case where the function shown in FIG. 9 is selected from the functions shown in FIG. 7 will be described as an example.
- Figure 10 shows the case where only localized Z distributed switching and soft handover switching are used, and other functions use fixed values. When these two functions can be switched, there are four combinations as shown in Fig. 10, and a terminal function identifier is assigned to each combination.
- Figure 10 As shown, the assigned terminal function identifiers need not be continuous values. In this way, in the example shown in FIG. 10, two functions are selected, and the combination power of the selection items provided by the two selected functions is a type. Four terminal function identifiers are generated, FIG. 10 shows function correspondence information for specifying functions corresponding to the four terminal function identifiers.
- FIG. 11 is a sequence diagram illustrating an example of a process flow between the communication control apparatus 100 and the communication terminal apparatus 200.
- communication terminal apparatus 200 makes a connection request to communication control apparatus 100 (Sl l).
- the communication control unit 201 designates a function that can change the function and switch the function according to the communication status, and a function that uses a fixed value without switching the function.
- the communication terminal apparatus 200 notifies the communication control apparatus 100 of the designated function information as the current terminal capability.
- the communication control device 100 receives the connection request and transmits a connection permission to the communication terminal device 200 that has made the connection request (S 12).
- the function selection section 151 of the communication control section 101 transmits the designated function information notified from the communication terminal apparatus 200 and the control information notified from the communication terminal apparatus 200 (the control slot in FIG. 6).
- a plurality of functional capabilities select a predetermined number of functions and determine a selected function based on the information notified by (1).
- the identifier generation unit 152 generates a terminal function identifier and function correspondence information based on the selected function selected by the function selection unit 151, and the communication control device 100 generates the generated terminal function identifier group and function correspondence information. (Combination of functions) is notified to the communication end device 200.
- Communication terminal apparatus 200 receives connection permission, terminal function identifier group, and function correspondence information from communication control apparatus 100, and returns a connection confirmation (S13).
- the communication control device 100 and the communication terminal device 200 communicate using the assigned terminal function identifier (terminal function identifier group) in the subsequent communication (S14).
- the identifier selection unit 104 of the communication control apparatus 100 selects one terminal function identifier from the generated terminal function identifier group and performs communication. This is continued until a change occurs in the function correspondence information. That is, when the communication terminal device 200 re-selects the function that allows the function to be switched and notifies the communication control device 100 of the specified function information, or when the communication control device 100 changes according to changes in the communication status, etc. It will continue until changes occur.
- the communication terminal device 200 When a change is made to the parameter that makes the function variable due to an increase in the moving speed of the communication terminal device 200, the communication terminal device 200 notifies the communication control device 100 of a terminal capability change request (S15). . At this time, in the communication terminal device 200, the communication control unit 201 designates a function that changes the function to enable switching of the function according to the communication status and a function that uses a fixed value without switching the function. The information is generated again as information, and the communication terminal device 200 again notifies the generated specified function information as the current terminal capability.
- the communication control device 100 receives the terminal capability change request and notifies the capability change permission to the communication terminal device 200 that has notified the terminal capability change request (S16).
- the function selection unit 151 of the communication control unit 101 is based on the designated function information notified from the communication terminal device 200! Then, the terminal function identifier (terminal function identifier group) is reissued to generate function correspondence information again, and the communication control device 100 notifies the terminal function identifier group and the function correspondence information.
- the terminal function identifier group to be reissued at this time may or may not overlap with the previous one.
- the communication terminal device 200 receives the capability change permission, the terminal function identifier group, and the function correspondence information, and transmits a capability change confirmation to the communication control device 100 (S17).
- Communication control device 100 and communication terminal device 200 perform communication using the reissued terminal function identifier group in subsequent communication (S18).
- communication control device 100 and communication terminal device 200 also perform the following operations.
- the communication control unit 101 determines which data slot is allocated to which communication terminal device 200 using other control data such as information data from the backbone and CQI data sent from the communication terminal device 200, and the allocation information. And the modulation scheme of each data slot is determined at the same time. Distribute used or localized is also decided here.
- the allocation information and modulation information are input to terminal ID selection section 102, modulation scheme selection section 103, and identifier selection section 104.
- Control slot generating section 105 receives the terminal function identifier and modulation scheme, and generates control slot data according to the obtained terminal function identifier and modulation scheme.
- the communication control unit 101 sends data for the communication terminal device 200 to the data slot generation unit 106, and the data slot
- the generation unit 106 generates the contents of the data slot.
- Frame data generation section 107 arranges data slot data based on allocation information and modulation information, and completes frame data. Completed frame data is transmitted to communication terminal apparatus 200 through mapping section 109, modulation section 110, and RF section 111.
- the format of the uplink signal transmitted from communication terminal apparatus 200 may be basically any format. It can be used as long as it can secure the reliability of each process in the sequence diagram shown in Fig. 11 and ARQ control. For example, it can be used with PDC (Personal Digital Cellular)! /, Or it can be used with wireless LAN (Local Area Network) V /!
- ARQ control section 108 controls ARQ with respect to the data of the transmitted slot by a control signal sent from communication terminal apparatus 200. Since communication terminal device 200 transmits the unreachable / achieved data of the slot as a control signal based on the ARQ control signal attached at the time of transmission, the contents of the slot are retransmitted again by that signal. If transmission fails even if retransmission is attempted for a certain period of time, the transmission data is discarded as a timeout. This time-out time is set by information exchanged when the communication terminal apparatus 200 makes a connection request and information exchanged when the capability is changed.
- the communication control unit 101 communicates with the communication control unit of the soft handover destination via the backbone, and transmits both. After adjusting the modulation method and transmission data, both sides It is realized by transmitting simultaneously from. Whether or not to perform this soft handover is also set by information exchanged when the communication terminal device 200 is connected and information exchanged when the capability is changed.
- communication terminal apparatus 200 When communication terminal apparatus 200 finds communication control apparatus 100, it makes a connection request according to the procedure shown in FIG. At this time, the communication control unit 201 receives the control slot transmitted from the communication control device 100 in advance, checks the quality of the received signal, sets which function to use at a fixed value, and can select which function. Decide whether to use the function, and notify the communication control device 100 using the specified function information when a connection request is made. The communication control apparatus 100 that has received the connection request determines a terminal function identifier group to be used by the communication terminal apparatus 200 and notifies the communication terminal apparatus 200 that has made the connection request.
- the communication control device 100 notifies this information using the broadcast ID.
- the broadcast ID is an ID indicating that it is information to be received by all the communication terminal devices 200 accommodated in the network, and a predetermined fixed value is used. If the terminal function identifier information of the self-communication terminal apparatus 200 is included in the broadcast information, the communication terminal apparatus 200 performs communication using the terminal function identifier thereafter. If the terminal function identifier assignment information cannot be received, a connection request is made again.
- FIG. 12 is a diagram showing an example of a packet configuration to be transmitted to communication terminal apparatus 200 in the conventional and the present embodiment.
- the upper part of FIG. 12 shows an example of a conventional packet structure, and the lower part of FIG. 12 shows an example of the packet structure of this embodiment.
- the header part 1201 includes control information other than flag bits such as an ID for identifying the communication control apparatus 100 and a time stamp.
- Terminal temporary identifier section 1202 stores a terminal temporary identifier (logical ID).
- the flag bit unit 1203 stores flag bits.
- the payload part 1204 stores the communication data body.
- the terminal temporary identifier 1202 is a logical ID used in the conventional method, and has a one-to-one relationship between the accommodated communication control device 100 and the communication terminal device 200.
- the terminal function identifier 1205 stores the terminal function identifier described in the present embodiment.
- the terminal temporary identifier part 1202 and the flag bit part 1203 correspond to the terminal function identifier part 1205.
- One or more terminal function identifiers are assigned to one communication terminal device 200, and a combination of functions to be used is assigned to each terminal function identifier at the same time. Is associated with the ability to specify the function to be used during communication.
- terminal function identifier section 1205 selects a function according to the communication status, the area of flag bit section 1203 is reduced, and the total amount of information is reduced. Is done.
- the terminal function identifier 1205 is the same as the terminal temporary identifier portion 1202. Although an example in which the amount of information is larger is shown, there may be a case where the amount of information is the same as that of the terminal temporary identifier section 1202.
- the terminal function identifier unit 1205 since the terminal function identifier unit 1205 issues a plurality of identifiers to one communication terminal device 200, the terminal function identifier unit 1205 is assumed to be larger than the information amount of the terminal temporary identifier unit 1202. It is.
- control procedure shown above can be used. After that, control is performed according to the procedure shown above, so that the information used for switching functions can be minimized. Communication is possible while limiting.
- the terminal function identifier space prepared for the parameter that makes the function variable can be set smaller than (the number of terminals that can be accommodated) X (number of selectable functions), and the normal function flag bit string is used. The amount of information can be reduced compared to.
- the communication control device 100 assigns a terminal function identifier in response to a request (designated function information) from the communication terminal device 200.
- a request designated function information
- the situation of the communication control device 100 You can make assignments that take into account!
- the functions that can be used in the case of the small communication control device 100 for example, when the number of MIMO antennas is limited to two. You may perform operations such as assigning only. The same applies to the case where the number of accommodated communication control devices 100 has increased and many functions cannot be assigned to terminal function identifiers.
- the terminal function identifier group is used for parameters to be changed at the time of transmission.
- the response on the receiving side is controlled by the value of the terminal function identifier.
- each communication end Even if CQI is transmitted from the terminal device 200 to the communication control device 100, it is necessary to assign a subchannel with good communication quality to each communication terminal device 200. If all communication terminal devices 200 frequently transmit CQIs in all subchannels, it is possible to allocate ideal subchannels, but in this case, only the transmission of CQIs consumes most of the uplink bandwidth. Resulting in.
- An efficient number of sub-channels for sending CQI varies depending on the communication status of communication control apparatus 100. For example, (1) There are too many communication terminal devices 200 accommodated in the communication control device 100 or the communication volume to each communication terminal device 200 is sufficiently large. If there is no subchannel that can be used, one CQI is transmitted. (2) If there are some free sub-channels and the communication situation is relatively stable, transmit the two CQIs of the sub-channel of the best quality and the sub-channel of the best quality for the other sub-channels. . (3) If the propagation path conditions frequently change, send CQIs for all subchannels. (4) If the propagation path is not stable and CQI transmission is meaningless anymore, CQI should not be transmitted at all. Such an operation method can be considered as an example.
- the latter two cases are particularly cases where the propagation situation is bad.
- the communication terminal device 200 that is not expected to have a bad propagation situation is accommodated, all subchannels as shown in (3) above are accommodated. There will be virtually no CQI transmission, and the efficiency of storing information will be low if all CQI transmission methods are supported at all times. In other words, the communication terminal device 200 having a low moving speed and the communication terminal device 200 that is used in a fixed manner such as a remote sensor are not used!
- the terminal function identifier it is possible to improve the storage efficiency of information by predetermining the CQI transmission methods that may be used and assigning the terminal function identifier to each.
- the address space to which the terminal function identifier is allocated is 0 to 2047, and that the address space 1 to 1983 except for the communication control device 100, broadcast, and multicast is used.
- Address spaces 1 to 511 have one CQI
- address spaces 512 to 1535 have two CQIs
- address spaces 1536 to 1791 have CQIs for all channels
- address spaces 1792 to 1983 have no CQIs, etc.
- the boundary value of the address is fixed, but it may be possible to change the boundary value by making a separate arrangement such as communication between the communication control device 100 and the communication terminal device 200. .
- the configurations of the communication control device 100 and the communication terminal device 200 according to the present embodiment are the same as those shown in FIGS.
- FIG. 13 is a diagram showing an example of a packet configuration to be transmitted to communication terminal apparatus 200 in the conventional and the present embodiment.
- the upper part of FIG. 13 shows an example of a conventional packet configuration
- the lower part of FIG. 13 shows an example of a packet configuration of this embodiment.
- the header part 1401 includes control information other than flag bits such as an ID for identifying the communication control apparatus 100 and a time stamp.
- the terminal temporary identifier section 1402 stores a terminal temporary identifier (logical ID).
- the flag bit part 1403 stores flag bits.
- the payload part 1404 stores the communication data body.
- the terminal temporary identifier 1402 is a logical ID used in the conventional method, and has a one-to-one relationship between the accommodated communication control device 100 and the communication terminal device 200.
- the terminal function identifier unit 1405 stores the terminal function identifier described in the present embodiment.
- Terminal temporary identifier part 1402 and flag bit part 1403 correspond to terminal function identifier part 1405.
- the terminal function identifier one or more terminal function identifiers are assigned to one communication terminal apparatus 200, and at the same time, the number of CQI transmissions is assigned to each terminal function identifier as described above. It has both the ability to specify 200 and the ability to specify the function to be used during communication.
- the size of the address space to which the terminal function identifier is assigned may be the same as or larger than the size used in the conventional method.
- the number of communication terminal devices 200 that can be accommodated in the communication control device 100 is determined by the size of the address space to which the terminal function identifier is assigned, but in this embodiment, the number of communication terminal devices 200 that can be accommodated in the communication control device 100 is It is determined from the size of the address space to which the terminal function identifier is allocated and the average number of terminal function identifiers allocated to one communication terminal apparatus 200.
- the average number of terminal function identifiers assigned to one communication terminal device 200 is If it is small, it may be the same as the logical ID space prepared by the conventional method, but if the average value of the number of terminal function identifiers assigned to one communication terminal device 200 is large, the address space for assigning the expected terminal function identifiers It is necessary to prepare.
- the second embodiment and the first embodiment can be used in combination.
- distributed is used in the first embodiment.
- all channels are connected!
- the terminal function identifier used to return CQI for all channels in distributed is somewhere between 1536 and 1791.
- the example in which the information storage efficiency is increased by making the function correspond to the terminal function identifier has been described.
- a terminal function identifier an identifier composed of a terminal temporary identifier and a mode number for specifying the function is used, a function to be used in the state of the communication control device is selected, and the information amount of the terminal function identifier Among them, information storage efficiency is improved by adjusting the proportion of terminal temporary identifier and mode number.
- a communication control device control station, base station
- a communication terminal device mobile station
- U-net network outside topology will be described in the OFDMA system. Embodiments are applicable to other network topologies.
- FIG. 14 is a block diagram showing an example of the configuration of the communication control apparatus 300 of the present embodiment.
- the communication control unit 301 controls information data via the backbone handled by the communication control device 300 and each block of the communication control device 300. Specifically, it determines which data slot is assigned to which communication terminal device using other control data such as CQI data sent to the communication terminal device, and simultaneously modulates each data slot. Determine the method. Whether it is distributed or localized is decided here. Also, the number of temporary terminal identifiers is determined from the slot allocation status and the status of the number of terminals accommodated in the communication terminal device. The communication control unit 301 notifies the modulation scheme selection unit 103 of the allocation information and the modulation information, and sends other control information including the number of terminal temporary identifiers and the communication status (communication congestion status) to the function selection unit 302, the identifier generation unit 303. To notify.
- the function selection unit 302 Based on an instruction from the communication control unit 301, the function selection unit 302 selects at least one function from among a plurality of functions as a selection function, and generates selection function information.
- the selection function is a function that can switch the selection items of the function.
- the function selection unit 302 Based on the control information notified from the communication control unit 301, the function selection unit 302 also selects a selection function for a plurality of functional capabilities. Further, the function selection unit 302 determines the number of selection functions to be selected based on the number of terminal temporary identifiers notified from the communication control unit 301.
- identifier generation unit 303 In response to an instruction from communication control unit 301, identifier generation unit 303 generates a terminal temporary identifier based on control information notified from communication control unit 301 and selected function information notified from function selection unit 302. At the same time, a mode number and a function map are generated.
- the mode number is a number that specifies a plurality of selection items that the selection function has.
- a plurality of mode numbers specifying combinations of a plurality of selection items included in each of the plurality of selection functions are generated.
- the function map is information that associates a plurality of mode numbers with selection items of the selection function.
- the identifier generation unit 303 also receives information (designated function information, control information, etc.) based on at least one of the number of communication terminal devices to be connected and / or required communication quality.
- information designated function information, control information, etc.
- the ratio of the memory to which the terminal temporary identifier and the mode number are allocated is determined based on other control information. This will be described later with reference to FIG.
- the identifier selection unit 304 selects one selection item from a plurality of selection items included in the selection function in response to an instruction from the communication control unit 301, and selects a terminal function identifier associated with the selected selection item. To do. Specifically, the terminal I or the blueprint (terminal unique identifier or terminal function identifier) of the communication terminal device (communication destination device) that is the communication destination, the modulation scheme information, and the type of ARQ that is selected are selected. Based on the ARQ control information shown, etc. The mode number corresponding to the selection item of the function to be used is selected, and the terminal temporary identifier generated by the identifier generation unit 303 and the selected mode number are selected (generated) as the terminal function identifier.
- the identifier assigning unit 305 has a function of generating a different terminal identifier (terminal function identifier) corresponding to a function to be used and assigning it to the communication destination device.
- FIG. 14 shows an example realized by the identifier generation unit 303 and the identifier selection unit 304.
- the function selection unit 302, the identifier generation unit 303, and the identifier selection unit 304 may be implemented by the communication control unit 301, and each of the above components is arranged in the communication control unit 301. Or may be placed elsewhere. The same applies to the identifier assigning unit 305.
- FIG. 15 is a block diagram showing an example of the configuration of the communication terminal device 400 of the present embodiment.
- the communication control unit 401 controls communication in the communication terminal apparatus 400.
- the communication control unit 4001 receives map data including a function map described with reference to FIG.
- the communication control unit 401 analyzes the terminal function identifier notified from the communication control device 300 based on data such as the function map, acquires the terminal temporary identifier and the function mode, and uses the function map and the function mode.
- the function selection items to be acquired are acquired, and communication with the communication control device 300 is performed.
- the format of the uplink signal transmitted from communication terminal apparatus 400 to communication control apparatus 300 may be basically any format. It can be used if the reliability that can perform the control and ARQ control described in this embodiment is secured. For example, you can use a method that you use on a PDC or a method that you use on a wireless LAN! / ⁇ .
- ARQ is performed by a control signal sent from communication terminal apparatus 400 to the data of the transmitted slot.
- the slot data is unreachable and has been transmitted as a control signal, so that the contents of the slot are retransmitted again by the transmitted signal. If transmission fails even if retransmission processing is attempted for a certain period of time, the transmission data is discarded as a timeout. This time-out period is the information exchanged when the communication terminal device 400 requests connection, and is exchanged when the capability is changed. It is set by the information to be done.
- the communication control unit 301 communicates with the communication control unit 401 of the communication terminal device 400 that is the soft node over destination via the backbone, and transmits both. Modulation method 'Achieved by sending data from both sides after adjusting transmission data. Whether to perform this soft handover is also set by information exchanged when the communication terminal apparatus 400 is connected to the communication control apparatus 300 and information exchanged when the capability is changed.
- FIG. 16 is a diagram illustrating an example of functions controlled by the communication control device 300 in the present embodiment.
- the case where six functions are used is taken as an example, and each function is shown using Flag 1 force Flag6, and each function has a plurality of selection items.
- FIG. 16 shows an example in which the functions of Flag3 and Flag6 have four selection items, the function of Flag5 has eight selection items, and the other Flag functions have two selection items. .
- Flag3 is 2 bits
- Flag5 is 3 bits
- the other Flag is an example that requires lbit flag bits.
- Each function has the following contents.
- the first function indicated by Flagl indicates whether the slot allocation method for the communication terminal is distributed or low-powered.
- the second function indicated by Flag2 indicates whether soft handover is performed or not.
- the third function shown in Flag3 shows how many MIMO antennas are used.
- the fourth function indicated by Flag4 indicates whether to lengthen or shorten the ARQ cycle.
- the fifth function shown in Flag 5 indicates what kind of modulation method is currently used in the communication control device.
- the sixth function indicated by Flag6 indicates the number of bits of the terminal function identifier currently used by the communication control device.
- the modulation method is changed for each OFDM subcarrier. Or the coding rate of the error correction code.
- the terminal temporary identifier is an ID that is temporarily assigned when the communication terminal device is connected to the communication control device.
- the terminal unique identifier is assigned to the communication terminal device and has a long bit length. It is used for In general, one terminal function identifier is assigned to one communication terminal device, and at most a few multicast addresses can be assigned. It is necessary to prepare the number of bits corresponding to the number of units that can be accommodated in the communication control device. There is.
- the total number of flag bits indicating the function and the number of bits for the terminal temporary identifier becomes 24 bits.
- the function is indicated by a mode number generated by the identifier generation unit 303. Therefore, the memory used for the terminal function identifier that combines the mode number and the terminal temporary identifier can be said to be 24 bits.
- This 24-bit terminal function identifier memory (also called “control information memory” and “identifier memory”) is required for all information transmitted in the frame. The smaller the amount of control information to include, the better. In addition, since this bit number information is added to all communication data, it is desirable that there is little control information in terms of communication efficiency. In the present embodiment, information necessary for the terminal function identifier is efficiently selected according to the state of the communication control device 300 and stored in the memory. A specific state of the communication control information device 300 will be shown and described below.
- FIG. 17 is a diagram illustrating an example of a memory usage state in the function priority state. In the function priority state shown in Fig. 17, the total number of bits used for the terminal function identifier that combines the mode number indicating function selection and the terminal temporary identifier is 18 bits.
- FIG. 18 is a diagram illustrating an example of a usage state of the memory in the function restricted state. In the function restriction state shown in Fig. 18, the total number of bits used for the terminal function identifier is 18 bits.
- FIG. 19 is a diagram illustrating an example of a memory usage state in the terminal number priority state. In the terminal number priority state shown in Fig. 19, the total number of bits used for the terminal function identifier is 18 bits.
- FIG. 20 is a diagram illustrating an example of the usage ratio of the memory for the terminal function identifier.
- the upper part of FIG. 20 shows an example in the case of the function priority state, and the lower part of FIG. 20 shows an example in the case of the terminal number priority state.
- the number of functions used is reduced and the number of bits used for terminal function identifiers is increased, it can be compared that the percentage used for terminal temporary identifiers is increasing.
- the mode number depends on the function, and the terminal temporary identifier does not depend on the function. Therefore, the area to which the mode number is assigned depends on the function, and the area to which the terminal temporary identifier is assigned does not depend on the function. You can also. Depending on which function is used among multiple functions, the ratio between the area that depends on the function and the area that does not depend on the function is changed.
- the terminal function identifier combined with the mode number and the terminal temporary identifier.
- the memory for the separate child can be used efficiently according to the state of the communication control device 300.
- the memory usage can be optimized according to the state of the communication control device 300.
- the amount of memory allocated to the terminal function identifier can be reduced.
- the identifier generation unit 303 assigns (generates) a mode number that specifies a selection item for each function, and generates a function map that associates the selection item for each function with the mode number.
- the number of functions to be used is changed depending on the number of accommodated terminals of the communication terminal apparatus 400 accommodated by the communication control apparatus 300, it can be determined whether the number of accommodated terminals exceeds or falls below a predetermined threshold.
- a predetermined threshold In order not to increase the update frequency of the function map, it may be possible to provide a hysteresis characteristic with a certain range of threshold values.
- the number of accommodated terminals may be adjusted by giving priority to the number of functions of the communication control device 300. . This is the case, for example, when a high data rate communication is required from the communication terminal device 300, and it is necessary to use a modulation method with high multiplicity such as multi-antenna MIMO, 16QMA, or 64QAM. In such a case, the number of functions of the communication control device 300 may be increased as necessary, and the number of bits for the terminal temporary identifier may be decreased.
- the function selection unit 302 is notified from the communication control unit 301. Based on the state of the communication control device 300, the number of functions to be selected as a selection function is determined as the function used by the communication control device 300, and a plurality of functional force selection functions are selected. As described above, the state of the communication control device 300 includes the number of communication terminal devices 400 to be connected (the number of accommodated terminals), the processing capability of the communication control device 300, the required communication quality, and the like.
- the identifier generating unit 303 is shown in FIG. Determine the percentage of memory shown.
- the identifier generation unit 303 generates a mode number that identifies the selection item of each function based on the terminal temporary identifier that satisfies the number of accommodated terminals to be connected and the selection function selected by the function selection unit 302. Generate feature maps. For functions that the function selection unit 302 has not selected as selection functions, any one of the selection items of each function is set to a fixed value, and the fixed value function is set.
- the communication control apparatus 300 accommodates this function map and notifies the communication terminal apparatus 400 of the function map.
- the communication control device 300 notifies the communication terminal device 400 that houses the function map and the fixed value function. Information on this function map and fixed value functions is large, but the frequency of updating is low. Therefore, it is possible to notify each communication terminal device 400 over time.
- FIG. 22 is a diagram illustrating an example of a frame configuration and an example of a data configuration of a function map to be notified.
- a part 1003 (predetermined area indicated by diagonal lines) of the control slot 1001 in the frame 1000 is used and notification is made using a plurality of frames.
- a function map and a fixed value function are reported as a set of 32 consecutive frames.
- the function map and the fixed value function may be referred to as a function map or the like.
- the function map and fixed value function used in the communication control device 300 and the function map and fixed value function grasped in the communication terminal device 400 always correspond one-to-one with V. Goodbye If this correspondence goes wrong, the communication terminal device 400 cannot extract necessary information. Therefore, it is assumed that the same information is transmitted a plurality of times so that reception does not fail in communication terminal device 400, and notification is made in advance before the function map or the like changes.
- the communication control device 300 is shown in (b) of FIG. Function map currently used + Fixed value function and next update timing force Used function map + Fixed value function and next scheduled update time are used.
- the data structure shown in Fig. 22 (b) is map data. Also, it is assumed that the time in the communication control device 300 is displayed in the control slot 1001.
- the function map is updated in units of 512 mS (milliseconds), and if one frame is represented by 2 mS and the map is represented by one set of 32 frames, the same information can be transmitted eight times within 512 mS.
- the communication control device 300 at time A, as shown in FIG. 22 (c), MapA which is a function map currently used, MapB which is a function map used after update, and the next scheduled update time
- MapB which is the currently used function map
- MapC which is the function map used after the update
- MapC which is the function map used after the update
- Send TimeD which is the scheduled update time of.
- Communication terminal apparatus 400 synchronizes the current time indicated in control slot 1001 and the time in communication terminal apparatus 400, and updates to a new function map and fixed value function when the scheduled update time is reached. In this embodiment, there are 8 reception opportunities before the function map etc. are updated, so in most cases the update of the function map etc. will be successful. In the unlikely event that power is not received for a long time, the communication terminal device 400 must stop receiving the subsequent data slot 1002 until map data is received.
- a serial number that is updated each time the function map is updated may be added to the function map included in the map data. In this case, even if the update time shown in the map data comes, it can be explicitly shown that the content of the function map does not change from the previous state. Adding a serial number has the disadvantage of increasing the amount of information, but the communication terminal device 400 is longer than the map data update cycle for some reason! Even if the time map data reception fails, this serial number By seeing, it is immediately known that the status does not change from before, so there is an advantage that the reception processing can be resumed at that time.
- communication terminal apparatus 400 when communication terminal apparatus 400 finds communication control apparatus 300, it receives function map data in the control slot. Confirm that the message was received without error Continue to continue. Thereafter, the communication terminal device 400 continues to receive the map data assigned to a part 1003 in the control slot 1001, checks the update time in the map data, and updates the function map and the like referred to in the communication terminal device 400 at the specified time. To do. This makes it possible to demodulate the data slot 1002 arranged after the control slot. If the function map or the like can be updated normally, the communication terminal device 400 can perform normal communication.
- the identifier generation unit 303 can generate a mode number according to the number of selection functions that do not correspond to all of a plurality of functions, and adaptive modulation control. It is possible to suppress the amount of information required for Further, the identifier generation unit 303 can flexibly change the ratio of the memory allocated to the terminal temporary identifier and the mode number according to the state of the communication control device 300. Thereby, a terminal function identifier can be generated according to the communication status. Therefore, it is possible to optimize the amount of information necessary for adaptive modulation control. Furthermore, the communication device according to the present embodiment can suppress the amount of information by selecting a plurality of functional force selection functions and changing the memory ratio.
- the function selection unit, the identifier generation unit, and the identifier selection unit can be implemented by hardware such as a circuit, software, or hardware and software. It is also possible to carry out by a combination of these.
- the computer loads the program into the memory in the communication device and executes each process under the control of the central processing unit.
- the program is a communication method for allocating a terminal identifier to a communication destination device and communicating with the communication destination device using a plurality of functions, and is realized in the communication device (on a computer).
- a step of generating a different terminal identifier corresponding to the function to be used and assigning it to the communication destination device is performed.
- a more specific example is a program for realizing a communication method of a communication device that communicates with a communication destination device using a plurality of functions having a plurality of selection items within the communication device (on the computer). The following steps are provided.
- Step of selecting at least one function as a selection function (2) A step of generating a plurality of terminal function identifiers associating the communication destination device with a plurality of selection items of the selection function. (3) A step of selecting one selection item from a plurality of selection items of the selection function. (4) selecting a terminal function identifier associated with the selected selection item also with the plurality of terminal function identifiers. (5) A step of transmitting the selected terminal function identifier to the communication destination device. It should be noted that steps other than (1) to (5) above may be included, and steps for realizing each process described in the above embodiments may be further included.
- the embodiment may also be used.
- the identifier selection unit described in each of the above embodiments has a function of assigning a terminal function identifier (terminal identifier) to a communication destination device.
- terminal identifier The function of assigning a terminal function identifier (terminal identifier) is not limited to the function of the identifier selection unit described in each of the above embodiments, but a part of the function implemented by the communication control unit (for example, as shown in FIG. 3 Function) and the functions (part of the function) of the identifier generation unit 303 and the function selection unit 302 shown in FIG.
- the identifier assigning unit may include components having functions of an identifier generating unit and an identifier selecting unit.
- the amount of information necessary for adaptive modulation control can be optimized by using the terminal function identifier described in the above embodiments. It becomes possible. This makes it possible to optimize the size of the memory that stores information necessary for adaptive modulation control. In addition, since the amount of information to be notified is reduced when the function selection unit selects a selection function from a plurality of functions, the amount of information necessary for adaptive modulation control can be suppressed.
- FIG. 1 is a block diagram illustrating an example of a configuration of a communication control device according to a first embodiment.
- FIG. 2 is a block diagram illustrating an example of a configuration of a communication terminal device according to the first embodiment.
- ⁇ 3] Among the functions of the communication control unit of the first embodiment, it is a block diagram showing an example of a configuration related to generation of a terminal function identifier and an identifier assigning unit.
- FIG. 4 is a block diagram illustrating an example of a configuration of an identifier selection unit according to the first embodiment.
- FIG. 5 is a block diagram showing an example of a configuration of a conventional logical ID selection unit.
- FIG. 6 is a diagram showing an example of a frame used in an OFDMA system.
- FIG. 7 is a diagram showing an example of functions assigned to terminal function identifiers in the first embodiment.
- FIG. 8 is a diagram showing an example of selecting and using a function of a portion.
- FIG. 9 is a diagram showing another example when a part of functions is selected and used.
- FIG. 11 is a sequence diagram illustrating an example of a process flow between the communication control device and the communication terminal device.
- FIG. 12 is a diagram illustrating an example of a packet configuration to be transmitted to the communication terminal device in the conventional and first embodiments.
- FIG. 13 is a diagram illustrating an example of a packet configuration transmitted to the communication terminal device in the conventional and second embodiments.
- FIG. 15 is a block diagram illustrating an example of a configuration of a communication terminal device according to a third embodiment.
- FIG. 16 is a diagram illustrating an example of functions controlled by the communication control device in the third embodiment.
- FIG. 17 is a diagram illustrating an example of a memory usage state in a function priority state.
- FIG. 18 is a diagram illustrating an example of a memory usage state in a function restricted state.
- FIG. 19 is a diagram illustrating an example of a memory usage state in a terminal number priority state.
- FIG. 20 is a diagram illustrating an example of a usage ratio of a memory for a terminal function identifier.
- FIG. 19 is a diagram showing an example of mode number assignment in the case of the function restriction state shown in FIG.
- FIG. 22 is a diagram showing an example of a frame configuration and an example of a data configuration of a function map to be notified. Explanation of symbols ⁇
Abstract
Description
Claims
Priority Applications (4)
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US12/282,127 US8805367B2 (en) | 2006-03-14 | 2007-03-12 | Method and apparatus for allocating terminal identifiers based on communication function |
US14/319,813 US10602539B2 (en) | 2006-03-14 | 2014-06-30 | Method and apparatus for allocating terminal identifiers based on communication function |
US16/823,301 US11013029B2 (en) | 2006-03-14 | 2020-03-18 | Method and apparatus for allocating terminal identifiers based on communication function |
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US14/319,813 Continuation US10602539B2 (en) | 2006-03-14 | 2014-06-30 | Method and apparatus for allocating terminal identifiers based on communication function |
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US11013029B2 (en) | 2021-05-18 |
US10602539B2 (en) | 2020-03-24 |
JPWO2007105685A1 (ja) | 2009-07-30 |
US8805367B2 (en) | 2014-08-12 |
JP4933531B2 (ja) | 2012-05-16 |
US20090059849A1 (en) | 2009-03-05 |
US20140314020A1 (en) | 2014-10-23 |
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