JP3970674B2 - Wireless communication system and base station and terminal station constituting the same - Google Patents

Wireless communication system and base station and terminal station constituting the same Download PDF

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Publication number
JP3970674B2
JP3970674B2 JP2002124614A JP2002124614A JP3970674B2 JP 3970674 B2 JP3970674 B2 JP 3970674B2 JP 2002124614 A JP2002124614 A JP 2002124614A JP 2002124614 A JP2002124614 A JP 2002124614A JP 3970674 B2 JP3970674 B2 JP 3970674B2
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Prior art keywords
base station
terminal station
transmission
frequency channel
information
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JP2003319449A (en
Inventor
公彦 今村
茂孝 野口
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シャープ株式会社
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    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02DCLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THIR OWN ENERGY USE
    • Y02D70/00Techniques for reducing energy consumption in wireless communication networks
    • Y02D70/40According to the transmission technology
    • Y02D70/44Radio transmission systems, i.e. using radiation field
    • Y02D70/448Radio transmission systems, i.e. using radiation field for communication between two or more posts
    • Y02D70/449Radio transmission systems, i.e. using radiation field for communication between two or more posts at least one of which is mobile

Abstract

<P>PROBLEM TO BE SOLVED: To efficiently use a time range and a plurality of frequency channels by easily recognizing the frequency channel used for an own radio communication system. <P>SOLUTION: In the radio communication system including a base station 10 and terminal stations 11, 12 and 13 and enabling communication by using a plurality of the frequency channels, the station 10 sends first information regarding the number of the frequency channels used by itself to the terminal stations 11, 12 and 13. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a radio communication system and a base station and a terminal station suitable for configuring the radio communication system.
[0002]
[Prior art]
In recent years, a low-power wireless communication system that uses the 5 GHz band and does not require a license has been proposed and standardized, and a wireless communication system that actually uses IEEE 802.11a or the Hi-SWAN standard of ARIB (Radio Industry Association) has been developed. ing.
[0003]
[Problems to be solved by the invention]
However, in the 5.15 GHz to 5.25 GHz band already permitted for the low-power radio communication system, there are only four channels with a frequency band of 20 MHz (occupied signal frequency band is 18 MHz). If there are many in the same area, there is a possibility that the throughput is reduced due to radio wave interference. In addition, the above wireless communication system is a system that assumes communication using only one channel.
[0004]
Recently, there has been a movement to open up frequencies in the high frequency band, and a low-power wireless communication system using a quasi-millimeter wave band of 25 GHz band or 27 GHz band is permitted under the Radio Law, and standardization is in progress. Conventionally, a frequency band that has been limited to other uses is released by imposing a restriction with electric power.
[0005]
According to the frequency allocation plan updated by the Ministry of Internal Affairs and Communications on February 28, 2002, for example, a personal area system assuming outdoor Internet access at a hot spot such as a station or a coffee shop is 24.77 GHz to 25.23 GHz. Uses a 460 MHz frequency band (excluding upper and lower 20 MHz guard bands), and can arrange 23 radio channels at a frequency interval of 20 MHz (occupied signal frequency band per channel is 18 MHz), up to 3 consecutive channels Can be transmitted simultaneously. Furthermore, in a community area using 27.02 GHz to 27.46 GHz (excluding upper and lower 20 MHz guard bands) and assuming a wireless LAN or a wireless home link in a home or factory, 22 wireless channels are provided at intervals of 20 MHz. Arrangement is possible, and simultaneous transmission of up to 6 consecutive channels is possible.
[0006]
Regarding a communication system using a plurality of frequency channels, there is a description related to Japanese Patent Laid-Open No. 10-154969. The communication system described in the above publication is a relatively narrow-band communication system such as a radio telephone system, in which a plurality of transmission channels are set in a transmission band so as to cope with a change in transmission capacity.
[0007]
However, in the communication system, a transmission channel to be used for communication is determined in advance, and there is no description related to a technique of performing communication using a plurality of frequency channels in a wireless communication system in which its own communication channel is fluid. That is, a technology related to a wireless communication system of high speed and large capacity (1 channel, transmission speed per second of 54 megabits or more) capable of simultaneously using a plurality of frequency channels and transmitting a moving image in real time is known. Not.
[0008]
An object of the present invention is to provide a technique for simultaneously using a plurality of frequency channels in a wireless communication system.
[0009]
[Means for Solving the Problems]
According to an aspect of the present invention, there is provided a wireless communication system including a base station and a terminal station and capable of communicating using a plurality of frequency channels, wherein the base station is a first related to the number of frequency channels used by itself. Is sent to the terminal station. A wireless communication system is provided.
[0010]
According to the radio communication system, the terminal station can know the number of frequency channels that can be used for communication with the base station.
[0011]
The first information may be not only the number of frequency channels but also the number of the frequency channel, or may be information regarding the frequency band to be used specifically, but at least the number of frequency channels used by itself. Contains information about. Hereinafter, the term “number of frequency channels” is used in the same meaning.
[0012]
The first information is preferably included in the control information transmitted by the base station for each frame, and more preferably included in the preamble signal.
[0013]
The terminal station transmits a request signal related to a frequency channel and a transmission / reception time region that the terminal station requests to use based on the first information to the base station, and the base station transmits the base station based on the request signal. It is preferable to make adjustments related to allocation of transmission / reception time regions and frequency channels used for communication between a station and the terminal station.
[0014]
In the wireless communication system, the base station actually performs transmission / reception time domain and frequency channel based on the number of frequency channels used by itself, the frequency channel requested by the terminal station and the transmission / reception time domain. Therefore, both communication timings and frequency channels can be matched.
[0015]
The adjustment is an adjustment that allocates a transmission / reception time region and a frequency channel between the base station and the terminal station so that communication can be performed simultaneously in at least two frequency channels selected from the plurality of frequency channels. Is preferred.
[0016]
According to the radio communication system, communication can be simultaneously performed between the base station and the terminal station using two or more frequency channels. Therefore, large capacity data can be transmitted at high speed.
[0017]
Furthermore, it is preferable that the base station transmits the second information related to the transmission / reception time domain and the frequency channel after the adjustment is performed.
[0018]
The terminal station that has received the second information can know the time domain and frequency channel for actual data communication based on the adjusted transmission / reception time domain and frequency channel.
[0019]
According to another aspect of the present invention, each of the base station or the terminal station can perform communication using a plurality of frequency channels by having the above-described characteristic configuration. In particular, smooth communication can be performed by adjusting and assigning the frequency channel and time domain, and by using a plurality of frequency channels, it is possible to transmit and receive a large amount of data at high speed.
[0020]
Further, the power supply to its own transmission means can be stopped or reduced in a time region other than the transmission time region assigned to itself, and the own reception means in a time region other than the reception time region assigned to itself By providing the power supply adjusting means that can stop or reduce the power supply to the base station, it is possible to save power in the base station and the terminal station. In addition, power consumption can be controlled according to the application by increasing / decreasing the number of frequency channels to be used and increasing / decreasing the allocation time area based on the data capacity to be transmitted / received, resulting in power saving of the base station and terminal station. Is possible.
[0021]
Further, when the number of frequency channels is 3 or more, a filter or demodulation from 1 channel to 3 channels using one or both of a filter or demodulator for 1 channel and a filter or demodulator for 2 channel is used. By configuring the circuit, the number of filters or demodulator used can be reduced, and the circuit scale can be reduced.
[0022]
Further, a power detection unit that detects power in each frequency channel, a storage unit that stores a power threshold value that serves as a reference for determining whether or not the corresponding frequency channel is used for communication, and the power detection unit By providing power comparison means for comparing the detected power with the power threshold, the number of frequency channels can be easily detected from only one type of preamble pattern.
[0023]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, considerations made by the inventors will be described before the embodiments of the present invention are described.
[0024]
In order to efficiently use radio waves in a wireless communication system in which its own communication channel is fluid and a plurality of frequency channels can be used for simultaneous communication, the inventor It is important that the station knows the communication data transmission capacity and the frequency channel availability, and notifies the terminal station of the situation, and adjusts the time domain and frequency channel for data transmission and reception accurately. I thought it was. In particular, when the frequency channel that can be used by the base station is multiple channels, for example, 20 channels or more, the terminal station searches for a frequency channel used by its own wireless communication system and is used simultaneously for transmission and reception. It seems important to recognize the number efficiently and quickly.
In a wireless communication system that includes a base station and a terminal station and can simultaneously communicate using a plurality of frequency channels, for example, information on the number of frequency channels that the base station can use for its own (base station) communication The first information including it is transmitted to the first terminal station, for example. The first information may be not only the number of frequency channels but also information on frequency channel numbers or frequency bands, but it is necessary to include at least information on the number of frequency channels. The first information can be transmitted by being included in the control information that the base station transmits for each frame.
[0025]
By receiving the first information, the first terminal station can know the number of frequency channels that can be used by its communication system. Upon receiving the first information, the first terminal station transmits transmission / reception request information including a request regarding the frequency channel number or frequency band used for communication and the transmission / reception time to the base station.
[0026]
The base station receives the transmission / reception request information from the first terminal station, and the frequency channel number and the transmission / reception request time for which the terminal station including the base station, the first terminal station, and the other terminal station has requested use. And frequency channel numbers and transmission / reception time regions used for communication with each terminal station are scheduled (adjusted).
[0027]
For example, in the next frame, the base station transmits the second information related to the frequency channel number used for transmission and reception and the transmission and reception timing. Each terminal station receives the second information and detects the adjusted frequency channel number and transmission / reception time region (timing), thereby enabling actual communication smoothly.
[0028]
Hereinafter, based on the above consideration, an embodiment of the present invention will be described in detail with reference to the drawings.
[0029]
FIG. 1 is a diagram illustrating a configuration example of a wireless communication system according to an embodiment of the present invention. A wireless communication system 1 according to an embodiment of the present invention includes one base station 10 and at least one or more terminal stations, for example, a first terminal station 11, a second terminal station 12, and a third terminal station 13. And a centralized control wireless communication system using, for example, a TDMA (Time Division Multiple Access) system. In this wireless communication system, the base station 10 centrally controls transmission / reception timings of the terminal stations 11, 12 and 13 and frequency channels to be used. In addition, the wireless communication system 1 uses, for example, the above-described 24.77 GHz to 25.23 GHz band frequency, uses 23 wireless channels from 1 to 23 at a frequency interval of 20 MHz, and simultaneously transmits up to three consecutive channels. It is the radio | wireless communications system which performs. The base station 10 and the first terminal station 11 constituting the wireless communication system 1 can transmit and receive using a maximum of 3 channels, and the second terminal station 12 can transmit and receive using a maximum of 2 channels. In contrast, the third terminal station 13 will be described as an example of a system that transmits and receives using only one channel. The number of channels that can be transmitted and received in each terminal station of the above-described wireless communication system is an example for convenience of explanation, and a system in which all the terminal stations can use three channels may be used.
[0030]
FIG. 2 is a functional block diagram showing a configuration example of a base station or a terminal station constituting the wireless communication system 1 according to the embodiment of the present invention.
[0031]
As shown in FIG. 2, the base station or terminal station includes an antenna 21, an antenna duplexer 22, an RF / IF receiver 23, an A / D converter 24, a demodulator 25, and an information detector 26. A bus control unit 27, a modulator 28, a D / A converter 29, an RF / IF transmitter 30, and a system control unit 31.
[0032]
The block configuration of the base station 10 and the terminal stations 11, 12, 13 is as shown in FIG. 2, and both have substantially the same configuration. However, some of the functions of the system control unit 31 are different due to the difference in the specifications of each functional block due to the difference in the maximum number of transmission / reception channels described above and the difference in functions related to transmission / reception between the base station and the terminal station. Yes. The difference in functions related to transmission / reception between the base station and the terminal station is mainly because only the base station 10 has a frequency channel allocation function, a time domain allocation function, and a function for reporting these.
[0033]
Next, the operation of the base station or terminal station will be described based on the functional block diagram shown in FIG. The reception signal input from the transmission / reception antenna 21 is selected on the receiving side by the antenna duplexer 22, and the RF / IF receiver 23 amplifies the received signal and converts the frequency to an intermediate frequency (IF) band. . The received signal converted to an intermediate frequency (for example, a center frequency of 20 MHz) is converted from an analog format to a digital format signal by the A / D converter 24. Usually, the received signal is demodulated by the demodulator 25, and is interfaced with the outside. The data is taken into an information processing apparatus such as a personal computer (PC) via the bus control unit 27 having the functions as described above.
[0034]
It should be noted that the preamble detector including information related to frame synchronization, frequency channels, and the like is not demodulated using the demodulator 25, for example, by the method described in Japanese Patent Laid-Open No. 2001-313623. 26, it is possible to determine the frequency channel number used by the frame synchronization and the own system from the preamble periodic pattern or the like.
[0035]
The method described in Japanese Patent Application Laid-Open No. 2001-313623 performs a process of adding information related to the frequency channel number used by itself to a preamble signal. The process of adding to the preamble signal corresponds to a process of changing the cycle Tw of the preamble signal according to the number of frequency channels used by its own system. For example, if the number of frequency channels used by the wireless communication system is 1, the cycle of the preamble signal is set to Tw, and if the number of frequency channels is 2, the cycle is set to Tw / 2. If is 3, the cycle is set to Tw / 4. The number of frequency channels can be detected without demodulating the preamble signal based on whether or not the period of the preamble signal matches the preamble pattern stored in advance by the radio station (terminal station). Of course, in addition to the method of detecting the number of frequency channels without demodulating the preamble pattern, it is also possible to detect the number of frequency channels, the frequency channel number, etc. by demodulating the preamble signal, for example.
[0036]
Data (Data) output from a PC or the like is added via a bus control unit 27 to a modulator 28 where control information is added and converted into a transmission signal format (packet format, etc.) used for wireless communication. Is called. Next, the transmission signal is converted from a digital format to an analog format signal by the D / A converter 29, and the RF / IF transmitter 30 performs amplification of the transmission signal and frequency conversion to a radio frequency (RF) signal. The signal is transmitted from the transmitting / receiving antenna 21 to the antenna via the antenna duplexer 22.
[0037]
The system control unit 31 has a function of controlling the system of the entire base station or terminal station and a function of controlling power supply to each unit. The base station also has functions for storing and determining frequency channel number recognition and time allocation (time scheduling).
[0038]
FIG. 3 is a diagram showing an example of a communication data structure in the wireless communication system of the present invention. As shown in FIG. 3, the communication data structure in the radio communication system according to the embodiment of the present invention has a basic configuration composed of a large number of frames divided at certain time intervals. One frame 41 transmits a control information transmission area 42 including first information for notifying the terminal station of a frequency channel and transmission / reception timing used by the base station for transmission / reception, and transmits data from the base station to the terminal station. Is divided into a downlink area 43 for transmitting data and an uplink area 44 for transmitting data from the terminal station to the base station. The control information transmission area 42 includes a preamble 45 for obtaining information such as frame synchronization, and a data payload (46-1 to 46-N) including time domain and frequency channel information for transmission / reception within the frame. Including.
[0039]
Next, with reference to FIG. 4 to FIG. 7, processing relating to allocation of time domain and frequency channel for each frame will be described. Reference is also made to FIGS. 1 to 3 as appropriate. FIG. 4 is a diagram illustrating an example of time domain allocation according to each frequency channel of the base station 10, the first terminal station 11, and the second terminal station 12 in the Nth frame. 4A is an example of time domain allocation for the Nth frame, FIG. 4B is an example of time domain usage for the base station 10 in the Nth frame, and FIG. FIG. 4D shows an example of using the time domain for the first terminal station 11 in the Nth frame, and FIG. 4D shows an example of using the time domain for the second terminal station 12 in the Nth frame.
[0040]
FIG. 5 shows a method of using a time domain according to each frequency channel of the base station 10, the first terminal station 11, and the second terminal station 12 in the (N + 1) th frame that is the frame next to the Nth frame. It is a figure explaining the example of. FIG. 5A shows an example of allocation in the time domain of the (N + 1) th frame, and FIG. 5B shows an example of use of the time domain related to the base station 10 in the (N + 1) th frame. 5 (C) shows an example of using the time domain for the first terminal station 11 in the (N + 1) th frame, and FIG. 5 (D) shows the time for the second terminal station 12 in the (N + 1) th frame. An example of using the area is shown.
[0041]
In the wireless communication system according to the present embodiment, it is specified that the third terminal station 13 does not perform transmission / reception in the Nth frame and the (N + 1) th frame. However, an example of using the time domain of the third terminal station 13 is not shown.
[0042]
FIG. 6 is a flowchart showing an operation example of the base station constituting the radio communication system according to the present embodiment, from the start of the uplink phase of the Nth frame to the end of the uplink phase of the (N + 1) th frame. Show. FIG. 7 is a flowchart showing an operation example of the terminal station constituting the wireless communication system of the present invention, from the start of the uplink phase of the Nth frame to the end of the uplink phase of the (N + 1) th frame. Yes.
[0043]
Hereinafter, the operation of the wireless communication system according to the embodiment of the present invention will be described with reference to FIGS. Reference is also made to FIGS. 1 to 3 as appropriate.
[0044]
When the base station 10 and the first and second terminal stations 11 and 12 constituting the wireless communication system 1 are not performing adjustment (negotiation) in the Nth and previous frames, the first and second terminal stations When 11 and 12 try to start communication, the number of frequency channels used by the wireless communication system 1 is detected, and the base station 10 and the terminal stations 11 and 12 are associated with the number of frequency channels and time domain allocation. (Negotiation) between the two. Information regarding at least the number of frequency channels used by the wireless communication system 1 is included in the first information transmitted by the base station 10. In the example shown in FIG. 4B, the first information is transmitted in the control information (control information 50-1 transmitted in the frequency channel number CH1 and the frequency channel number CH2) periodically transmitted by the base station every frame. The terminal receives the control information 50-2 or any of the control information 50-3 transmitted in the frequency channel number CH3) on any one of the corresponding frequency channels CH1 to CH3. The stations 11 and 12 can be notified.
[0045]
As shown in FIG. 4C, for example, the first terminal station 11 receives the control information A including the first information in the frequency channel CH1 and the time domain 51-1. The second terminal station 12 receives the control information A including the first information in the frequency channel CH2 and the time domain 52-2. Since the first information in the received control information A includes information on the number of frequency channels used by the wireless communication system 1, the terminal stations 11 and 12 can use frequencies that the base station 10 can use. The number of channels can be recognized.
[0046]
In other words, the number of the frequency channel to be used can be determined when the control information A (first information) is received and demodulated. For example, the maximum number of channels that can be used by the terminal station 11 or the terminal station 12 is described in the first information. In consideration of the hardware restrictions of the terminal station 11 or 12, the terminal station 11 or 12 finally requests the frequency channel (number) used for data communication from the base station 10.
[0047]
It is also possible to determine when the control information A (first information) is received and the preamble pattern is detected by the information detector 26 without being demodulated.
[0048]
Next, each of the first and second terminal stations 11 and 12 sends a request signal A or B for performing adjustment (negotiation) on the frequency channel and the time domain to the base station 10, respectively. Send to. By receiving this signal, the base station 10 can know the data transmission time region requested by the terminal stations 11 and 12, the data reception time region, the frequency channel number to be used, and the like.
[0049]
When the terminal stations 11 and 12 transmit the request signal, the first terminal station 11 and the second terminal station 12 have a free frequency channel to transmit the request signal by performing carrier sense. Check if it exists.
[0050]
If it is confirmed that the requested frequency channel is free, transmission processing is performed. If it cannot be confirmed, carrier sensing is performed again by changing the frequency channel, or carrier sensing is performed again after a predetermined time has elapsed. After performing the carrier sense, in the Nth frame (see FIG. 4), the first terminal station 11 uses the same first frequency channel (CH1) as the frequency channel that received the control information A to The request signal A is transmitted to the base station 10 using the area 54. The second terminal station 12 also uses the second frequency channel (CH2) to transmit the request signal B to the base station 10 using the time domain 56 after carrier sense (step SB21 in FIG. 7).
[0051]
The base station 10 receives the request signal A in the time domain 53 in the first frequency channel CH1, and receives the request signal B in the time domain 55 in the second frequency channel CH2 (step SA11 in FIG. 6).
[0052]
In the next step SA12, the base station 10 determines that each of its own terminal station and the other terminal station has data based on the requested time area between the own terminal station and the other terminal station and the usable frequency channel. Each allocation is adjusted so that the frequency channel used for transmission / reception and transmission / reception timing (time domain) do not overlap. At this time, the required communication capacity between the base station 10 and the terminal station 11 or 12, the number of channels that the base station 10 or the terminal stations 11 and 12 can simultaneously transmit and receive, the distance between the stations, transmission power, transmission It is preferable to adjust the system resource (hardware resource) such as speed as a judgment material so that, for example, as much communication capacity as possible can be secured in the frame.
[0053]
Note that the frame length may be adjusted according to the communication capacity of the own wireless communication system, and the length of the uplink phase and the downlink phase is appropriately expanded or reduced according to the ratio of the uplink and downlink communication capacity. You may let them.
[0054]
Next, in step SA13, the base station 10 transmits the second information about the transmission / reception timings of the first and second terminal stations 11 and 12 and the frequency channel to be used in the frame next to the Nth frame ( Transmit to the terminal station in the (N + 1) th frame. The second information is preferably transmitted by being included in the control information B (time regions 70-1, 70-2 and 70-3 shown in FIG. 5) in the (N + 1) th frame, for example.
[0055]
In step SB22, the first terminal station 11 selects any one frequency channel in the time domain 71-1, 71-2, or 71-3, receives the control information B, and receives the second terminal station. 12 receives the control information B by selecting either frequency channel in the time domain 72-2 or 72-3. By receiving the control information B, the terminal station can know the content of the second information.
[0056]
In the next step SB23, the first terminal station 11 and the second terminal station 12 determine the data transmission / reception time domain (transmission / reception timing) and frequency channel after adjustment by the control station 10 from the received second information. Detect assignments.
[0057]
In the next step SA14, if there is data to be transmitted to the terminal station, the base station 10 selects and determines the frequency channel to be transmitted based on the adjustment (scheduling) of the transmission time region (timing) in step SA15. The necessary data 1, 2 and 4 (FIG. 5B) are transmitted based on the transmission time region (timing) and the frequency channel (step SA16). If there is no data to be transmitted, the process proceeds to step SA17.
[0058]
On the other hand, if there is data to be received by the terminal station 11 and the terminal station 12 in step SB24, the terminal station 11 and the terminal station 12 select a frequency channel for receiving the data in step SB25 and determine the received reception time region (timing). ) And the frequency channel, the received data (data 1 at the first terminal station 11 and data 2 at the second terminal station 12) is received (step SB26). If there is no data to be received, the process proceeds to step SB27.
[0059]
The operation from Step SA14 to Step SA17 and the operation from Step SB24 to Step SB27 will be described.
[0060]
The base station 10 transmits the first data signal in the time domain 73 using the three channels from the first frequency channel (CH1) to the third frequency channel (CH3). The first terminal station 11 receives signals on all the channels from the first frequency channel CH1 to the third frequency channel CH3 in the time domain 74, and demodulates all the received data, whereby the first data Retrieve the signal.
[0061]
Next, the base station 10 transmits the second data signal in the time domain 75 using two channels of the second frequency channel CH2 and the third frequency channel CH3. The second terminal station 12 receives the signals of the second frequency channel CH2 and the third frequency channel CH3 in the time domain 76, and takes out the second data signal by demodulating the reception data for two channels. .
[0062]
In the next step SA17, when there is data to be received from the terminal station, the base station 10 selects the frequency channel to be received based on the allocation (scheduling) of the reception timing in step SA18, and the received reception time region determined Based on (timing) and the frequency channel, a data signal (which may include a transmission / reception request signal for the next frame) is received (step SA19). If there is no data to be received, the process proceeds to step SA20. If further communication is to be continued, the process returns to step SA12 in order to schedule the (N + 2) th frame.
[0063]
In addition, the base station 10 receives data signals transmitted from the first and second terminal stations 11 and 12 at a predetermined timing, and performs adjustments in N frames performed with the terminal stations (previous As a result of the negotiation), in the time domain and frequency channel (time domain 83 and time domain 82) not used for receiving the data signal, other terminal stations (for example, the third terminal) other than the first and second terminal stations It is monitored whether a transmission / reception request signal from the station 13) is transmitted, and if there is a transmission / reception request signal, it is reflected in the adjustment (scheduling) of the time domain and frequency channel in the next frame.
[0064]
In step SB27, when there is data to be transmitted, the first terminal station 11 and the second terminal station 12 select a frequency channel for transmitting data in step SB8, and are determined to be received. Based on the timing and the frequency channel, a data signal (which may include a transmission / reception request signal for the next frame) is transmitted (step SB29). If there is no data to be transmitted, the process proceeds to step SB30. If further communication is to be continued, in the (N + 2) th frame that is the frame next to the (N + 1) th frame, for example, in the control information. The process returns to step SB22 for receiving the included third signal.
[0065]
Operations from step SA18 to step SA20 and from step SB27 to step SB30 will be described with reference to FIG.
[0066]
In the time domain 78, the first terminal station 11 transmits the third data signal using three channels from the first frequency channel to the third frequency channel. In the time domain 77, the base station 10 receives signals from the first frequency channel to the third frequency channel, and demodulates the reception data of all three channels, thereby extracting the third data signal.
[0067]
Subsequently, in the time domain 80, the second terminal station 12 transmits the fourth data signal using two channels of the second frequency channel and the third frequency channel. In the time domain 79, the base station 10 receives the signals of the second frequency channel and the third frequency channel, and demodulates the received data for two channels to extract the second data signal.
[0068]
Through the above steps, communication between a base station and a terminal station can be smoothly performed in a wireless communication system that can use a plurality of frequency channels.
[0069]
Further, since the base station 10 and the first and second terminal stations 11 and 12 can know the transmission / reception timing from the first or second information or the like, transmission is performed as in the time domain 83 or the time domain 82. Alternatively, power supply can be stopped or power supply can be reduced in a time region that is not used for reception.
[0070]
That is, in the time regions 83 and 82 in which transmission is not performed, the power supply to the transmission units (the modulator 28, the D / A converter 29, and the RF / IF transmitter 30) is stopped or put in a standby state to reduce the power supply. it can. Further, in the time domain in which reception is not performed, the power supply can be reduced by stopping the power supply of the reception unit (RF / IF receiver 23, A / D converter 24, demodulator 25) or by setting the power supply to the standby state. Further, when both transmission and reception are not performed, power supply to the antenna duplexer 22 and the bus control unit 27 can be stopped or reduced in addition to the transmission unit and the reception unit.
[0071]
Next, a modification of the wireless communication system according to the embodiment of the present invention will be described.
[0072]
First, the radio | wireless communications system by a 1st modification is demonstrated with reference to FIG. As shown in FIG. 8, the radio communication system according to the first modification has a time domain adjustment function that can adjust the time domain length of at least one of the frame length, the downlink phase, and the uplink phase.
[0073]
FIG. 8A is a diagram illustrating a frame configuration when adjustment is not performed by the time domain adjustment function, and FIG. 8B illustrates a frame configuration when time domain is adjusted using the time domain adjustment function. ing.
[0074]
As shown in FIG. 8A, a time region 83 and a time region 82 that are not used for data transmission / reception exist in one frame. FIG. 8B shows a frame configuration after deleting at least one of these time regions 83 and 82 from the frame. As shown in FIG. 8B, the length of the downlink phase and the frame length are shortened.
[0075]
By shortening the frame length, transmission loss and synchronization error are reduced, which has the advantage of reducing the data error rate. In addition, there is an advantage that the data transmission rate can be substantially shortened.
[0076]
Next, a multi-channel demodulation technique for demodulating data in a wireless communication system capable of transmitting and receiving data using a plurality of frequency channels having different frequency bands as in the wireless communication system according to an embodiment of the present invention Will be described in detail with reference to FIGS. In FIGS. 9 and 10, a data demodulation technique when performing wireless communication using three channels will be described as an example. The demodulation technique shown in FIG. 9 is a technique for separating received signals for each frequency channel using three frequency filters, demodulating each frequency channel CH1 to CH3 separately, and then synthesizing individual demodulated signals. The base station or the terminal station receives an RF (high frequency) signal 101 that uses a frequency band for three channels of the center frequency f1, the center frequency f2, and the center frequency f3. These modulated signals are down-converted into IF signals in the intermediate (IF) frequency band by inputting local signals to the mixer 111, and then the IF signals are distributed into three. In the distributed IF signal, adjacent signals are removed by a filter (band pass filter) having a pass band for one channel, and IF signal 103-1 (CH1 signal) and IF signal 103-2 (CH2 signal). , IF signal 103-3 (CH3 signal). The IF signals 103-1 to 103-3 are demodulated individually as digital data signals 105-1 to 105-3 by the demodulators 112-1 to 112-3. By synthesizing these demodulated data 105-1 to 105-3 by the data synthesizer 113, the received signal can be demodulated.
[0077]
The multi-channel demodulation technique shown in FIG. 10 is a technique that can reduce the number of frequency filters or demodulators. For example, as shown in FIG. 10A, a 1-channel filter 131 and a 2-channel filter 133 are branched after the down converter 111 (FIG. 9).
[0078]
When demodulating only 1CH, a filter 131 for 1CH is used as shown in FIG. As shown in FIG. 10C, when 2CH is demodulated, a filter 133 for 2CH is used. As shown in FIG. 10D, when 3CH is demodulated, both the 1CH filter 131 and the 2CH filter 133 are used. In this way, in a wireless communication system using multiple channels, the number of filters or the number of demodulators can be made smaller than in the normal case (the number of channels is the same).
[0079]
Next, a technique for detecting the number of channels by detecting a power with one type of preamble fixed will be described with reference to FIG.
[0080]
FIG. 11A shows a configuration in which a power detector 141 connected to the RF / IF receiver 23 and the system control unit 31 in FIG. 2 is provided. As shown in FIG. 11B, the power detector 141 detects the power from, for example, CH (-1) to CH (3) while sequentially adjusting the reception frequency to the frequency channel to be used. As shown in FIG. 11C, for example, powers P1 to P4 relating to four channels CH1 to CH4 are detected, and the threshold power Pth and the powers P1 to P4 detected by the comparator 147 are respectively detected. Compare. In the example shown in FIG. 11C, the powers P1 and P2 of CH1 and CH2 are larger than Pth, and P3 and P4 are smaller than Pth. From these results, it can be detected that a frequency channel having power larger than Pth, that is, in this case, two channels of CH1 and CH2 are used.
[0081]
Next, since CH1 and CH2 may be used by another wireless communication system, the received signal of CH1 or CH2 is demodulated, or the preamble pattern of the received signal is detected and the same as its own. Judgment is made to confirm whether or not the wireless communication system is used.
[0082]
Compared with the case where the frequency channel is detected by the preamble pattern, the preamble is fixed to one type, so that the circuit configuration of the information detector 26 shown in FIG. 2 can be simplified. The amount of data sent as the first information or the second information may be small.
[0083]
Next, an application example of the present invention will be described with reference to FIG. FIG. 12 shows a technology for transmitting / receiving large-capacity data such as moving image data and music data, taking advantage of the ability to use multiple frequency channels, and a device (base station or terminal station) corresponding to the data capacity to be transmitted / received. It is a figure which shows the technique which changes the power consumption of. As the number of frequency channels, three channels from CH1 to CH3 will be described as an example. In addition, in order to simplify the description, the case where the base station and the terminal station are communicating one-to-one will be described as an example, but it is common to have a plurality of terminal stations as described above. .
[0084]
FIG. 12A is a diagram illustrating an example of using frequency channels and time domains in a base station. FIG. 12B is a diagram illustrating an example of using frequency channels and time domains in a terminal station. FIG. 12C is a diagram illustrating a relationship between transmission / reception data capacity and power consumption in the base station and the terminal station.
[0085]
As illustrated in FIG. 12A, the base station uses the frequency channels CH1, CH2, and CH3 to direct the control information B including the second information to the terminal station in the time domains 200-1, 2, and 3. The terminal station uses the frequency channels CH1 to CH3 and receives the control information B including the second information in at least one of the time domains 220-1, 2 and 3.
[0086]
For example, in the time domain 203, the base station transmits moving image data using all frequency channels from the frequency channels CH1 to CH3, and the terminal station transmits the moving image data from the frequency channels CH1 to CH3 in the time domain 223. Receive using all frequency channels. As shown in FIG. 12C, since the moving image data has a large data capacity D1, it is preferable to perform transmission / reception using all the frequency channels CH1 to CH3. The power consumption P11 at this time increases.
[0087]
Next, the base station sends text data (or voice data) to the terminal station in the time domain 205. In this case, for example, only one channel of the frequency channel CH1 is used. On the other hand, the terminal station receives text data on the frequency channel CH1 in the time domain 225. Since the data capacity D1 of text data is usually smaller than that of moving image data, for example, it is based on the idea that it is sufficient to use only one of the frequency channels. Therefore, the power consumption P11 can be reduced by stopping the operation of the circuits related to the other channels (CH2 and CH3) or lowering the operation voltage of the related circuits.
[0088]
In the time domain 206, since the base station does not transmit or receive any data, as shown in FIG. 12C, the data capacity D1 is close to zero, and the power consumption P11 can be made very small. As described above, in the time domain that is not used for either transmission or reception, supply of power can be stopped or supply power can be reduced. That is, in the time domain in which transmission is not performed, power supply to the transmission units (modulator 28, D / A converter 29, RF / IF transmitter 30) shown in FIG. Can be reduced. Further, in the time domain in which reception is not performed, the power supply can be reduced by stopping the power supply of the reception unit (RF / IF receiver 23, A / D converter 24, demodulator 25) or by setting the power supply to the standby state. Furthermore, when both transmission and reception are not performed, power supply to the antenna duplexer 22 and the bus control unit 27 can be stopped or reduced in addition to the transmission unit and the reception unit.
[0089]
Next, in the time domain 207, the base station transmits music information data to the terminal station. The terminal station receives the music information data in the time domain 227. At this time, the data capacity D1 of the music information data is small compared to the moving image data, but large compared to the data capacity of the text data. Therefore, CH2 and CH3 are used as frequency channels. In this case, the power consumption P11 is generally a value between the time region 203 and the time region 205.
[0090]
In the time domain 231, the terminal station sends text data to the base station using only the frequency channel CH2. In the time domain 211, the base station receives text data using only the frequency channel CH2. As described above, the data capacity D1 and the power consumption P11 may be reduced.
[0091]
Next, the base station transmits data in which the audio information data is added to the moving image data to the terminal station in the time domain 215. In the terminal station, in the time domain 235, data in which audio information data is added to moving image data is received. Since this data has a large data capacity D1, all frequency channels between CH1 and CH3 are used, and the time domain allocation period is also increased. The power consumption P11 at this time also increases.
[0092]
As described above, various data communications can be handled by changing the length of the time domain to be allocated and the number of frequency channels to be used according to the volume of data to be transmitted and received. In addition, the power consumption can be managed in an integrated manner by adjusting the power consumption according to the data capacity. Therefore, the power consumption as a whole can be reduced.
[0093]
【The invention's effect】
According to the wireless communication system of the present invention, in a communication system that can use a plurality of frequency channels at the same time, it is possible to easily detect the frequency channel used by its own communication system. Also, by adjusting the frequency allocation and time allocation between the base station and the terminal station according to the communication data capacity and the frequency channel availability so that the blank time domain or blank frequency domain is allocated as much as possible, Resources can be used effectively, and a plurality of frequency channels can be used effectively.
[0094]
Furthermore, in the time domain that is not used for transmission / reception, it is possible to save the power of the base station / terminal station by stopping or reducing the power supply amount to the circuit related to transmission or reception of the base station or terminal station. Become.
[Brief description of the drawings]
FIG. 1 is a diagram showing a configuration example of a wireless communication system according to an embodiment of the present invention.
FIG. 2 is a block diagram showing a configuration example of a base station or a terminal station constituting the wireless communication system according to the embodiment of the present invention.
FIG. 3 is a diagram showing a configuration example of a communication data structure of a wireless communication system according to an embodiment of the present invention.
FIG. 4 is a diagram illustrating a data structure related to an Nth frame of a wireless communication system according to an embodiment of the present invention.
FIG. 5 is a diagram illustrating a data structure related to an (N + 1) th frame in a wireless communication system according to an embodiment of the present invention.
FIG. 6 is a flowchart showing an operation example of a base station constituting a wireless communication system according to an embodiment of the present invention.
FIG. 7 is a flowchart showing an operation example of a terminal station constituting the wireless communication system according to the embodiment of the present invention.
FIG. 8 is a diagram illustrating an example in which the frame length and the lengths of the downlink phase and the uplink phase are adjusted in the wireless communication system according to the embodiment of the present invention.
FIG. 9 is a diagram illustrating a flow of a data demodulation technique in a wireless communication system according to an embodiment of the present invention.
FIG. 10A to FIG. 10D are diagrams showing filter configuration examples in a wireless communication system according to a modification of the embodiment of the present invention.
FIGS. 11A to 11C are diagrams showing a frequency channel number detection technique of a wireless communication system according to a modification of the embodiment of the present invention.
FIGS. 12A to 12C are diagrams illustrating usage examples of a time domain and a frequency channel of a base station and a terminal station according to an embodiment of the present invention, and data capacity and power consumption of each station. It is a figure which shows the relationship.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... Wireless communication system, 10 ... Base station, 11, 12, 13 ... Terminal station, 21 ... Transmitting / receiving antenna, 22 ... Antenna duplexer, 23 ... RF / IF receiver, 24 ... A / D converter, 25 ... Demodulator, 26 ... Information detector, 27 ... Bus controller, 28 ... Modulator, 29 ... D / A converter, 30 ... RF / IF transmitter, 31 ... System controller, 41 ... Frame, 42 ... Control information 43 ... Downlink phase, 44 ... Uplink phase, 45 ... Preamble, 46 ... Data payload, 50, 51, 52 ... First control information area, 53, 54 ... First transmission / reception request signal area, 55 56, second transmission / reception request signal area, 70, 71, 72, second control information area, 73, 74, first data signal area, 75, 76, second data signal area, 77, 78 ... Third de Region of the data signal, 79, 80 ... area of the fourth data signals, 81, 82, 83, and 84 ... blank area.

Claims (14)

  1. A wireless communication system including a base station and a terminal station and capable of communicating using a plurality of frequency channels, wherein the base station sends first information regarding the number of frequency channels used by itself to the terminal station In a wireless communication system characterized by:
    The terminal station transmits a request signal related to a frequency channel and a transmission / reception time region that the terminal station requests to use based on the first information to the base station, and the base station transmits the base station based on the request signal. The transmission / reception time domain used for communication between the station and the terminal station is adjusted with respect to the allocation of frequency channels, and the adjustment can be performed simultaneously on at least two frequency channels selected from the plurality of frequency channels. And the frequency channel used by each of the terminal station and the other terminal station for data transmission / reception based on the transmission / reception time region and the usable frequency channel requested by the terminal station and the other terminal station. and so as not to overlap with each other and receive the time domain, tone allocated transmission and reception time and frequency channel between the terminal station and the base station Wireless communication system characterized in that it.
  2. It is suitable for use in a wireless communication system including a base station and a terminal station and capable of communicating using a plurality of frequency channels, and transmits first information regarding the number of frequency channels used by itself. In the base station
    The terminal station transmits a request signal related to a frequency channel and a transmission / reception time region that the terminal station requests to use based on the first information to the base station, and the base station transmits the base station based on the request signal. The transmission / reception time domain used for communication between the station and the terminal station is adjusted with respect to the allocation of frequency channels, and the adjustment can be performed simultaneously on at least two frequency channels selected from the plurality of frequency channels. And the frequency channel used by each of the terminal station and the other terminal station for data transmission / reception based on the transmission / reception time region and the usable frequency channel requested by the terminal station and the other terminal station. and so as not to overlap with each other and receive the time domain, tone allocated transmission and reception time and frequency channel between the terminal station and the base station Base station, characterized in that it.
  3.   The adjustment is performed based on a communication capacity required in communication between the base station and the terminal station, and a frequency channel and a transmission / reception time region in which the base station or the terminal station can transmit and receive simultaneously. The base station according to claim 2, characterized in that:
  4.   The base station according to claim 2, further comprising transmitting second information related to a transmission / reception time region and a frequency channel after the adjustment is performed.
  5.   The base station according to any one of claims 2 to 4, wherein the first information is independently transmitted using all frequency channels available to the first information.
  6.   After transmitting the second information, a data signal including data information transmitted or received by itself is transmitted / received using the transmission time region or reception time region and the frequency channel after the adjustment is performed. The base station according to claim 4 or 5, wherein
  7.   Based on the adjustment, the power supply to the transmission means can be stopped or reduced in a time region other than the transmission time region assigned to itself, and in a time region other than the reception time region assigned to itself. The base station according to any one of claims 2 to 6, further comprising supply power adjusting means capable of stopping or reducing power supply to the receiving means of the own receiver.
  8. Suitable for use in a wireless communication system including a base station and a terminal station and capable of communicating using a plurality of frequency channels, wherein the base station is selected from at least two of the plurality of channels. Each of the terminal station and the other terminal station transmits / receives data based on a transmission / reception time region and an available frequency channel required by the terminal station and the other terminal station so that the terminal station and the other terminal station can communicate simultaneously. First information on the number of allocated frequency channels is received from the base station so that the frequency channel to be used and the transmission / reception time region do not overlap, and the base station uses the first information based on the analysis result of the first information. A terminal station characterized by comprising detection means for detecting the number of frequency channels.
  9.   Receiving the first information, detecting information on the number of frequency channels used by the base station based on an analysis result of the first information, and at least one frequency channel in the frequency channels used by the base station; The terminal station according to claim 8, wherein a request signal related to a frequency channel and transmission / reception time required by the terminal is transmitted using the terminal.
  10.   Further, based on the request signal, a second transmission from the base station regarding the transmission / reception time and the frequency channel after adjusting the allocation of the data transmission / reception time and the frequency channel between the base station and the terminal station. The terminal station according to claim 9, wherein the terminal station receives information.
  11.   After receiving the second information, transmitting and receiving a data signal including data information to be transmitted or received by the own transmission time region or reception time region and the frequency channel after the adjustment is performed. The terminal station according to claim 10, wherein:
  12.   Based on the adjustment, in a time region other than the transmission time region assigned to itself, power supply to the transmission means can be stopped or reduced, and a time other than the reception time region assigned to itself The terminal station according to claim 10 or 11, further comprising supply power adjustment means capable of stopping or reducing power supply to its reception means in the area.
  13.   The number of frequency channels is 3 or more, and one or both of a filter or demodulator for one frequency channel and a filter or demodulator for two frequency channels are used, and each frequency channel from 1 to 3 is used. The wireless communication system according to claim 1, comprising a filter or a demodulator.
  14.   Furthermore, at least one of the base station or the terminal station is a power detection unit that detects power in each frequency channel, and power that serves as a reference for determining whether or not the corresponding frequency channel is used for communication. The wireless communication system according to claim 1, further comprising storage means for storing a threshold value, and power comparison means for comparing the power detected by the power detection means with the power threshold value.
JP2002124614A 2002-04-25 2002-04-25 Wireless communication system and base station and terminal station constituting the same Expired - Fee Related JP3970674B2 (en)

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JP4663653B2 (en) * 2003-11-19 2011-04-06 コーニンクレッカ フィリップス エレクトロニクス エヌ ヴィ How to access media with multi-channel devices
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US7969923B2 (en) 2008-11-14 2011-06-28 Dbsd Satellite Services G.P. Asymmetric TDD in flexible use spectrum
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US8259745B2 (en) 2010-03-29 2012-09-04 Intel Corporation Enhanced carrier sensing for multi-channel operation
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