WO2009107385A1 - 移動体通信システムにおける中継局、移動局および中継送信方法 - Google Patents
移動体通信システムにおける中継局、移動局および中継送信方法 Download PDFInfo
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- WO2009107385A1 WO2009107385A1 PCT/JP2009/000867 JP2009000867W WO2009107385A1 WO 2009107385 A1 WO2009107385 A1 WO 2009107385A1 JP 2009000867 W JP2009000867 W JP 2009000867W WO 2009107385 A1 WO2009107385 A1 WO 2009107385A1
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/14—Relay systems
- H04B7/15—Active relay systems
- H04B7/155—Ground-based stations
- H04B7/15507—Relay station based processing for cell extension or control of coverage area
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/24—Radio transmission systems, i.e. using radiation field for communication between two or more posts
- H04B7/26—Radio transmission systems, i.e. using radiation field for communication between two or more posts at least one of which is mobile
- H04B7/2603—Arrangements for wireless physical layer control
- H04B7/2606—Arrangements for base station coverage control, e.g. by using relays in tunnels
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W28/00—Network traffic management; Network resource management
- H04W28/02—Traffic management, e.g. flow control or congestion control
- H04W28/06—Optimizing the usage of the radio link, e.g. header compression, information sizing, discarding information
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W36/00—Hand-off or reselection arrangements
- H04W36/06—Reselecting a communication resource in the serving access point
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W88/00—Devices specially adapted for wireless communication networks, e.g. terminals, base stations or access point devices
- H04W88/02—Terminal devices
- H04W88/04—Terminal devices adapted for relaying to or from another terminal or user
Definitions
- the present invention relates to a relay station, a mobile station and a relay transmission method in a mobile communication system.
- a base station when operating a mobile communication system using a high frequency radio band, the coverage area of the radio communication base station apparatus (hereinafter referred to as a base station) becomes small, and thus, the service area is prevented from being reduced. It will be necessary to set up many base stations. Since installation of a base station requires a considerable cost, there is a strong demand for a technology for realizing a communication service using a high frequency radio band while suppressing an increase in the number of base stations.
- a radio communication relay station apparatus (hereinafter referred to as a relay station) between the base station and a radio communication mobile station apparatus (hereinafter referred to as a mobile station)
- Relay transmission technology has been studied, in which communication between the base station and the mobile station is performed via the relay station.
- wireless access technologies W-CDMA (Wide Code Code Division Multiple Access), LTE (long-term evolution), WLAN (Wireless LAN), WiMAX (Worldwide Interoperability for Microwave Access), etc.
- RAT Radio Access Technology
- a service in which a base station of Radio Access Technology (RAT) distributes relevant information (specific area information) within the specific area to a specific area within its own coverage area is under consideration.
- RAT Radio Access Technology
- a base station control apparatus stores specific area information in a specific area in a cover area of a base station under its own apparatus in a memory, and constantly transmits the stored specific area information via the base station.
- a base station control apparatus stores specific area information in a specific area in a cover area of a base station under its own apparatus in a memory, and constantly transmits the stored specific area information via the base station.
- Patent Document 1 the mobile station located in the specific area receives the specific area information and displays it on the display. At this time, the mobile station switches to the frequency band in which the specific area information is transmitted from the base station and receives the specific area information.
- the mobile station whenever the mobile station receives the specific area information, the mobile station generates a switching process to the frequency at which the specific area information is transmitted. For this reason, according to the above-mentioned prior art, an overhead for frequency switching occurs in the mobile station.
- the mobile station frequently transmits the specific area information transmitted from the base station to the specific area information (for example, emergency information such as the risk information for notifying the risk in the specific area) which is updated every moment. Need to receive. Therefore, in the mobile station, the number of frequency switching processes increases, and the overhead for frequency switching further increases.
- An object of the present invention is to provide a relay station, a mobile station, and relay transmission capable of suppressing overhead due to frequency switching processing for reception of specific area information in a mobile station by making a control channel for transmission of specific area information unnecessary. It is to provide a method.
- the relay station is a reception unit for receiving a signal from a base station having a first cover area, and a degree indicated by specific area information in a second cover area in which a part or all is included in the first cover area. And adding means for adding an offset of any of frequency offset, time offset, or power offset to the signal according to the transmission, and transmitting the signal after the addition of the offset to the mobile station in the second cover area And means.
- the mobile station receives a signal transmitted by a base station having a first cover area in the first cover area, and relays in a second cover area in which the first cover area includes a part or all of the signals.
- the receiving means for receiving the signal relayed by the station, and in the second cover area based on the offset, when any offset of frequency offset, time offset, or power offset is added to the received signal And a detection unit configured to detect a degree indicated by the area information.
- the relay transmission method of the present invention according to the degree indicated by the specific area information in the second cover area in which the first cover area includes a part or all of the signals received from the base station having the first cover area. And adding a frequency offset, a time offset, or a power offset, and transmitting the signal after the addition of the offset to the mobile station in the second coverage area. I made it.
- the present invention it is possible to eliminate the control channel for transmitting specific area information, and to suppress the overhead due to the frequency switching processing for receiving the specific area information in the mobile station.
- a diagram showing a configuration of a mobile communication system according to each embodiment of the present invention Example of signal transmission and reception according to Embodiment 1 of the present invention The figure which shows the correspondence of the offset which the relay station which concerns on Embodiment 1 of this invention has, and time.
- Block diagram showing the configuration of the relay station according to Embodiment 1 of the present invention Block diagram showing configuration of mobile station according to Embodiment 1 of the present invention Example of signal transmission and reception according to Embodiment 2 of the present invention
- Block diagram showing the configuration of a relay station according to Embodiment 2 of the present invention Lookup table held by the relay station according to Embodiment 2 of the present invention
- Example of signal transmission and reception according to Embodiment 3 of the present invention Block diagram showing the configuration of a relay station according to Embodiment 3 of the present invention
- Block diagram showing configuration of mobile station according to Embodiment 3 of the present invention Block diagram showing configuration of mobile station according to Embodiment 3 of the present invention
- LTE is used as an example of the RAT.
- FIG. 1 shows the configuration of a mobile communication system according to each embodiment of the present invention.
- a part of the cover area 11 of the base station 10 includes the entire cover area 21 of the relay station 20 which is a specific area. That is, a part of the cover area 11 of the base station 10 and the whole of the cover area 21 of the relay station 20 overlap (overlap).
- the relay station 20 is installed in a specific area to which specific area information is to be distributed.
- the specific area information indicating the degree risk information indicating the degree of danger in the specific area is cited.
- the degree of danger is represented by 0 to 100%
- the degree of danger 0% is the least dangerous (the safest)
- the degree of danger 100% is the most dangerous.
- the base station 10 has a coverage area 11 and transmits signals in this coverage area 11. This signal is received by the relay station 20 and the mobile station 30.
- the relay station 20 has a cover area 21 (specific area), and relays the signal received from the base station 10 to the mobile station 30 in the cover area 21. That is, the relay station 20 relays the signal of the base station 10 only in the cover area 21.
- the mobile station 30 directly receives in the cover area 11 the signal transmitted by the base station 10, and receives in the cover area 21 the signal relayed by the relay station 20.
- the relay station 20 adds, to the relay signal, danger degree information indicating the danger degree in the cover area 21 (specific area) of the own station. More specifically, the relay station 20 transmits the frequency offset, the time offset, or the power offset offset corresponding to the degree of risk in the coverage area 21 (specific area) to the signal received from the base station 10.
- the mobile station 30 adds and transmits the signal after the addition of the offset to the mobile station 30 located in the cover area 21. Note that this offset addition process is performed in a layer lower than layer 1.
- the mobile station 30 detects whether or not the mobile station 30 is located in the coverage area 21 (specific area) of the relay station 20 based on whether any of the above offsets is added to the received signal. Can. Therefore, when the mobile station 30 is located in the cover area 21 in the cover area 11, the mobile station 30 can receive the specific area information. Also, when an offset is added to the received signal, the mobile station 30 detects the degree of danger in the cover area 21 (specific area) of the relay station 20 based on the offset added to the received signal.
- Embodiment 1 In this embodiment, the case of adding a frequency offset to a signal to be relayed will be described.
- base station 10 transmits a signal of center frequency f C.
- Relay station 20 when the relay receives a signal from the base station 10 to mobile station 30, to shift the center frequency to f R by adding a frequency offset ⁇ f to the signal from the base station 10.
- the magnitude of this ⁇ f differs depending on the degree of danger indicated by the degree of danger information. For example, ⁇ f is set to 1000 Hz when hazard level information indicating a hazard level of 10% is added, and ⁇ f is set to 3000 Hz when hazard level information indicating a risk level of 30% is added.
- the relay station 20 controls the magnitude (
- the mobile station 30 detects whether or not its own station is located in a specific area based on whether or not the frequency offset of ⁇ f is added to the received signal. Further, when the mobile station 30 detects ⁇ f, the mobile station 30 detects the degree of danger indicated by the degree of danger information based on the magnitude of the ⁇ f.
- ⁇ f detected from the received signal is 1000 Hz
- ⁇ f detected from the received signal is 3000 Hz, the mobile station 30 detects that the own station is located in the cover area 21 of the relay station 20 and the risk is 30%.
- the mobile station 30 located other than the above-mentioned overlapping part in the cover area 11 of the base station 10 receives only the signal of the center frequency f C transmitted by the base station 10. Therefore, the mobile station 30 located other than the overlapping portion in the cover area 11 of the base station 10 can not detect the frequency offset ⁇ f. For example, when ⁇ f is not added to the received signal, the mobile station 30 detects that the mobile station 30 is not located in the coverage area 21 (specific area) of the relay station 20. That is, when the frequency offset ⁇ f is not added to the reception signal, the mobile station 30 can detect that the mobile station 30 is located outside the specific area.
- the maximum carrier frequency of the downlink is 2690 MHz
- the maximum moving speed of the mobile station is 350 km / h
- the value of frequency offset ⁇ f to the relay station 20 is added, a value within the detectable range f detect the mobile station 30, and, should the maximum frequency error f error_max ⁇ 1141Hz and separable values is there. That value of Delta] f, as detected easily, the condition (1) ⁇ f ⁇ f detect -f error_max and conditions (2) ⁇ f> preferably set to satisfy both the 2 * f error_max. Therefore, in the present embodiment, ⁇ f in the case where the degree of danger of the degree of danger information is 0% is set to ⁇ f default which is a value satisfying the condition (2). Further, as shown in FIG. 3, ⁇ f add to be added to ⁇ f default is determined according to the time of the timer held by the relay station 20.
- the offset ⁇ f to be added to the relay signal is ⁇ f default + ⁇ f add .
- ⁇ f add (hazard level [%] ⁇ 100) [Hz] shown in FIG. 3. Therefore, for example, ⁇ f at the risk level of 10% is ⁇ f default +1000 Hz. Similarly, ⁇ f at the risk level of 50% is ⁇ f default +5000 Hz.
- ⁇ f add is small and the degree of danger is low at around 5 o'clock to 15 o'clock, that is, in the daytime time zone.
- ⁇ f add is large and the risk becomes high at around 15:00 to 5:00, that is, in the nighttime time zone.
- FIG. 4 shows the configuration of relay station 20 according to the present embodiment.
- the wireless reception unit 202 receives the signal from the base station 10 via the antenna 201, performs reception processing such as down conversion and A / D conversion on the reception signal, and adds a frequency offset. Output to the unit 204.
- the offset determination unit 203 has a table showing the correspondence between ⁇ f add and time shown in FIG. 3, and refers to the table according to the time indicated by the timer inputted and the default offset ⁇ f default indicated by the offset information.
- the ⁇ f determined by the offset determination unit 203 is input to the frequency offset addition unit 204.
- the base station 10 may control the offset information, and the base station 10 may notify the relay station 20 of the offset information, or the relay station 20 may control the offset information.
- the frequency offset addition unit 204 adds the frequency offset ⁇ f determined by the offset determination unit 203 to the signal input from the wireless reception unit 202, and outputs the signal after the frequency offset addition to the wireless transmission unit 205.
- the wireless transmission unit 205 performs transmission processing such as D / A conversion, up conversion, etc. on the signal after frequency offset addition, and relays and transmits from the antenna 201 to the mobile station 30.
- FIG. 5 shows the configuration of mobile station 30 according to the present embodiment.
- the radio reception unit 302 receives only the signal from the base station 10 or the signal from the base station 10 and the signal from the relay station 20 via the antenna 301, and receives the received signal. It performs reception processing such as down conversion and A / D conversion, and outputs the result to the frequency error compensation unit 303, the frequency error detection unit 304, and the frequency offset detection unit 305.
- Frequency error compensation unit 303 compensates for frequency error f error of the received signal, and outputs the signal after frequency error compensation to demodulation unit 308 and frequency offset compensation unit 309.
- Demodulation section 308 demodulates the signal after frequency error compensation and outputs the result to diversity combining section 311.
- the detected ⁇ f is input to the risk level information detection unit 306 and the frequency offset compensation unit 309.
- Frequency offset compensation section 309 further compensates for frequency offset ⁇ f of the signal after frequency error compensation, and outputs the signal after frequency offset compensation to demodulation section 310.
- Demodulation section 310 demodulates the signal after frequency error compensation and after frequency offset compensation and outputs the result to diversity combining section 311.
- Diversity combining section 311 performs diversity combining of the signal input from demodulation section 308 and the signal input from demodulation section 310, and outputs a combined signal.
- the degree-of-risk information detection unit 306 detects the degree of danger indicated by the degree-of-risk information based on ⁇ f detected by the frequency offset detection unit 305. For example, the degree-of-risk information detection unit 306 calculates the degree of risk from f offset / 100 [%].
- the display unit 307 displays the degree of risk indicated in the degree-of-risk information input from the degree-of-risk information detection unit 306 on the display screen.
- the display unit 307 is not limited to displaying the degree of danger on the display screen, and may notify the degree of danger by voice or by means of a vibrator.
- the relay station adds, to the signal to be relayed, a frequency offset according to the degree of danger in the coverage area (specific area) of the relay station.
- the mobile station located in the specific area can detect that the local station is located in the specific area using the frequency offset added to the relay signal, and can detect the degree of danger in the specific area. . That is, the mobile station located in the specific area can detect the risk information without requesting distribution of the risk information and without performing the frequency switching process for detecting the specific area. Therefore, according to the present embodiment, it is possible to eliminate the control channel for transmitting the specific area information, and to suppress the overhead due to the frequency switching process for receiving the specific area information in the mobile station. Further, according to the present embodiment, since the mobile station does not perform the frequency switching process for receiving the specific area information, the power consumed by the specific area detection process can be suppressed. In addition, the mobile station can shorten the time to detect a specific area.
- the mobile station can perform diversity combining of the signal received directly from the base station and the relay signal from the relay station, a diversity effect can be obtained. Therefore, according to the present embodiment, the reception performance of the mobile station can be enhanced.
- the offset that relay station 20 adds to the signal transmitted from base station 10 is not limited to the frequency offset, and may be a time offset or a power offset. Even when the relay station 20 adds a time offset or a power offset to the signal transmitted from the base station 10, the same effect as this embodiment can be obtained.
- the degree of risk in another specific area (another relay station) located in the moving direction of the mobile station is lower than the degree of danger in a specific area (cover area of the relay station) where the mobile station is currently located.
- an offset according to the increasing or decreasing tendency of the degree of risk, which indicates whether it is increasing or decreasing, is added to the signal to be relayed.
- relay station 20 When relay station 20 receives a signal from base station 10 and relays the signal to mobile station 30 as in the first embodiment, relay station 20 adds frequency offset ⁇ f to the signal from base station 10 to set the center frequency to f R Shift to
- the sign of ⁇ f is determined according to the increasing or decreasing tendency of the degree of danger in the moving direction of the mobile station 30. Specifically, when the risk in the moving direction of the mobile station 30 tends to decrease (for example, when the mobile station 30 located in the specific area with the risk 30% approaches the specific area with the risk 10%)
- the relay station 20 determines the sign of ⁇ f to be negative ( ⁇ ). That is, as shown in FIG.
- the relay station 20 relays to the mobile station 30 the signal of the center frequency f R which is lower than the center frequency f C of the signal transmitted from the base station 10.
- the relay station 20 determines the sign of ⁇ f to be positive (+). That is, as shown in FIG. 6, the relay station 20 relays to the mobile station 30 a signal having a center frequency f R higher than the center frequency f C of the signal transmitted from the base station 10.
- the relay station 20 controls the magnitude of the frequency offset according to the degree of danger in the specific area, and controls the sign of the frequency offset according to the increase / decrease tendency of the degree of danger in the moving direction of the mobile station 30. . Then, the relay station 20 relays and transmits the signal of the center frequency f R to the mobile station 30.
- the mobile station 30 When the mobile station 30 detects ⁇ f, it detects the degree of danger indicated by the degree of danger information based on the absolute value (
- the relay signal of the center frequency f R when the relay signal of the center frequency f R is received, it is detected that the mobile station is moving in the direction in which the degree of danger decreases compared to the specific area in which the own station is located.
- a relay signal having a high center frequency f R is received, it is detected that the mobile station is moving in a direction in which the degree of risk increases more than the specific area in which the own station is located.
- FIG. 7 shows the configuration of relay station 20 according to the present embodiment.
- the same components as in FIG. 4 (Embodiment 1) are assigned the same reference numerals and descriptions thereof will be omitted.
- the relay station 20 shown in FIG. 7 receives, from the base station 10, a broadcast channel including peripheral relay station information in which frequency offsets are shown for each of the other relay stations installed in the vicinity of the local station as shown in FIG. .
- the north direction around the relay station 20 is 0 °
- the west direction is 90 °
- the south direction is 180 °
- the east direction is 270 °.
- the relay station 20 also receives, from the base station 10, position information of the mobile station 30 located in the coverage area 11 of the base station 10.
- the movement detection unit 206 detects the movement direction of the mobile station 30 located in the coverage area 21 of the own station based on the position information of the mobile station 30 input from the base station 10. Specifically, the movement detection unit 206 detects in which direction the mobile station 30 in the coverage area of the own station indicated by the position information is viewed from the own station. Then, the movement detection unit 206 outputs the detected movement direction of the mobile station 30 to the offset code determination unit 210.
- the mobile station 30 may measure the position of the mobile station and notify the relay station 20 of the measured position information of the mobile station.
- Demodulation section 207 demodulates the neighboring relay station information (FIG. 8) input from base station 10, and memory 208 stores the neighboring relay station information after demodulation.
- the offset amount determination unit 209 determines the offset amount (
- determined by the offset amount determination unit 209 is input to the offset code determination unit 210.
- the offset code determination unit 210 uses the peripheral relay station information stored in the memory 208, the movement direction of the mobile station 30 input from the movement detection unit 206, and the offset amount
- the offset code determining unit 210 determines whether the offset amount of the own station is equal to or more than the offset amounts of other relay stations, that is, when the mobile station 30 is moving in the direction of decreasing the risk (decreasing tendency).
- the offset code determining unit 210 determines whether the offset amount of its own station is smaller than the offset amount of another relay station, that is, if the mobile station 30 is moving in the direction of increasing the risk (the increasing tendency).
- determined by the offset amount determination unit 209 is 3000 Hz (30% risk), and the movement direction ⁇ of the mobile station 30 is 100 °.
- the relay station responds to the offset amount according to the degree of danger in the coverage area (specific area) of the own station and the increase / decrease tendency of the degree of danger in the moving direction of the mobile station. Determine the sign of the offset. Therefore, according to the present embodiment, the mobile station can perform detection of the specific area and detection of the risk in the same manner as in Embodiment 1 without performing communication of the control channel, and further, the mobile station It is possible to predict the increasing or decreasing tendency of the degree of danger in the moving direction of
- the offset that relay station 20 adds to the signal transmitted from base station 10 is not limited to the frequency offset, and may be a time offset or a power offset. Even when the relay station 20 adds a time offset or a power offset to the signal transmitted from the base station 10, the same effect as this embodiment can be obtained.
- relay station 20 responds to the degree of danger indicated by the degree of danger information in two different resources (frequency resource, time resource, or any two resources of power resources) of the relayed signal.
- the offset and the offset according to the increasing or decreasing tendency of the risk in the moving direction of the mobile station 30 are added.
- relay station 20 receives from base station 10 a signal having center frequency f C as shown in FIG. 2 and having a peak at time t 0 as shown in FIG.
- relay station 20 When relay station 20 receives a signal from base station 10 and relays the signal to mobile station 30, frequency offset ⁇ f and time offset ⁇ T are added to the signal from base station 10 to obtain center frequency f R. , Generates a signal having a peak at time t 1 .
- the magnitude of this ⁇ f differs depending on the degree of danger.
- the magnitude of this ⁇ T differs for each increase / decrease tendency of the degree of danger in the moving direction of the mobile station 30. That is, the relay station 20 controls the frequency offset in accordance with the degree of danger in the specific area, and controls the time offset in accordance with the increasing or decreasing tendency of the degree of danger in the moving direction of the mobile station 30. Then, the relay station 20 relays a signal having a peak at the time t 1 to the mobile station 30 at the center frequency f R.
- the mobile station 30 detects whether its own station is located in a specific area based on whether the frequency offset of ⁇ f is added to the received signal or whether the time offset of ⁇ T is added to it. Do.
- the frequency offset ⁇ f
- the value of the time offset ⁇ T added by the relay station 20 preferably satisfies the condition ⁇ T ⁇ T guard ⁇ T delay — max so as to be easily detected.
- ⁇ T default which is a value satisfying the above condition is set, and ⁇ T add to be added to ⁇ T default is determined according to the increasing / decreasing tendency of the degree of danger in the moving direction of the mobile station 30. Therefore, the time offset ⁇ T to be added to the relay signal is ⁇ T default + ⁇ T add .
- ⁇ T add (frequency offset in another relay station ⁇ frequency offset in own station) / 1000 [symbol].
- the mobile station 30 detects the increase / decrease tendency (increase tendency or decrease tendency) of the risk in the movement direction of the own station and how much the risk increases / decreases by the detected time offset ⁇ T. it can.
- FIG. 10 shows the configuration of relay station 20 according to the present embodiment.
- the same components as in FIG. 7 (Embodiment 2) will be assigned the same reference numerals and descriptions thereof will be omitted.
- frequency offset determination section 211 has a table showing the correspondence between ⁇ f add and time shown in FIG. 3 in the same manner as offset determination section 203 in the first embodiment,
- the frequency offset ⁇ f is determined with reference to the table according to the time indicated by the timer input and the offset information.
- the ⁇ f determined by the frequency offset determination unit 211 is input to the time offset determination unit 212 and the offset addition unit 213.
- the ⁇ T determined by the time offset determination unit 212 is input to the offset addition unit 213.
- the offset addition unit 213 adds ⁇ f determined by the frequency offset determination unit 211 and ⁇ T determined by the time offset determination unit 212 to the signal input from the wireless reception unit 202, and adds the signal after the offset addition. Output to the wireless transmission unit 205.
- FIG. 11 shows the configuration of mobile station 30 according to the present embodiment.
- the same components as in FIG. 5 (Embodiment 1) will be assigned the same reference numerals and descriptions thereof will be omitted.
- the detected ⁇ T is input to the risk level information detection unit 313 and the time offset compensation unit 314.
- the time offset compensation unit 314 further compensates for the time offset ⁇ T of the signal after frequency offset compensation input from the frequency offset compensation unit 309, and outputs the signal after time offset compensation to the demodulation unit 310. That is, in the demodulation unit 310, the signals after frequency offset compensation and after time offset compensation are demodulated.
- the risk level information detection unit 313 detects the risk level indicated by the risk level information based on ⁇ f detected by the frequency offset detection unit 305. Further, the danger level information detection unit 313 detects an increase / decrease tendency of the danger degree in the movement direction of the own station based on ⁇ T detected by the time offset detection unit 312. For example, when the detected ⁇ f offset is 3000 Hz, the danger level information detection unit 313 detects that the risk is 30% from ⁇ f offset / 100 [%], as in the first embodiment. Further, the degree-of-risk information detection unit 313 calculates the increase / decrease tendency of the degree of risk from T offset ⁇ 10 [%].
- the relay station responds to the frequency offset according to the degree of danger in the coverage area (specific area) of the own station and the increase / decrease tendency of the degree of danger in the moving direction of the mobile station. Determine the time offset.
- the mobile station can detect the increase and decrease tendency of the degree of danger and the degree of danger in the movement direction of the own station as in the second embodiment, and further, the increase and decrease tendency of the degree of danger in the movement direction of the own station It is possible to predict (the increase and decrease in the degree of risk and the degree of increase and decrease). That is, communication of the control channel is performed by adding the risk and the offset according to the increasing / decreasing tendency of the risk to different resources of the relay signal (here, frequency resource and time resource). Instead, it is possible to transmit more risk information. Therefore, according to the present embodiment, the mobile station can predict change of risk with higher accuracy.
- relay station 20 adds a frequency offset according to the degree of danger to the signal transmitted from base station 10, and the time according to the increase or decrease of the degree of danger in the moving direction of mobile station 30.
- the case of adding the offset has been described.
- the offset that relay station 20 adds in accordance with the degree of danger is not limited to the frequency offset, and may be a time offset or a power offset.
- the offset added by the relay station 20 according to the increasing / decreasing tendency of the risk in the moving direction of the mobile station 30 is not limited to the time offset, but may be a frequency offset or a power offset.
- LTE is taken as an example of the RAT.
- the RAT is not limited to LTE.
- other RATs include W-CDMA, WLAN, WiMAX, and the like.
- part of the coverage area of the base station includes the whole of the specific area (coverage area of the relay station), part of the coverage area of the base station and the specific area (coverage area of the relay station)
- a part of the coverage area of the base station includes a part of the specific area (the coverage area of the relay station), and a part of the coverage area of the base station and a part of the specific area (the coverage area of the relay station)
- the present invention can be practiced in the same manner as described above.
- the relay station determines the frequency offset to be added to the relay signal according to the time indicated by the timer.
- the relay station may determine an offset to be added to the relay signal according to the date or season in addition to the time. Also, the relay station may not determine the frequency offset according to the timer.
- a degree of danger in the following specific area there is a degree of danger in the following specific area.
- a mountainous area may be set as a specific area, and the appearance frequency of dangerous animals (for example, bears and the like) in the specific area may be set as the risk.
- a mountainous area may be set as a specific area, and the occurrence frequency of disasters (for example, avalanches and landslides and the like) in the specific area may be taken as the risk.
- the area where the land mine is embedded may be set as the specific area, and the burial status (for example, the burial density) of the land mine in the specific area may be regarded as the risk.
- the danger level information has been described as an example of the specific area information.
- the specific area information is not limited to the danger level information, and may be specific area information indicating a degree.
- traffic volume information (traffic congestion information) indicating increase or decrease of traffic volume in the specific area may be used as the specific area information.
- the traffic volume may be expressed as 0 to 100%, the state with the lowest traffic volume may be 0%, and the state with the highest traffic volume may be 100%.
- the offset ⁇ f to be added to the relay signal is ⁇ f default + ⁇ f add in the same manner as in the above embodiment.
- ⁇ f add (traffic volume [%] ⁇ 100) [Hz]. Therefore, for example, ⁇ f at traffic volume 10% is ⁇ f default +1000 Hz.
- the mobile station can detect the traffic volume in the specific area where the mobile station is located or the increase / decrease tendency of the traffic volume in the movement direction of the mobile station without using the control channel.
- allowable transmission power information indicating increase or decrease of the allowable transmission power of the mobile station in the specific area
- the allowable transmission power may be expressed as 0 to 100%
- the state in which the allowable transmission power is the smallest may be set as 0%
- the state in which the allowable transmission power is largest may be set as 100%.
- the offset ⁇ f to be added to the relay signal is ⁇ f default + ⁇ f add in the same manner as in the above embodiment.
- ⁇ f add (permissible transmission power [%] ⁇ 100) [Hz].
- ⁇ f at the allowable transmission power of 10% is ⁇ f default +1000 Hz.
- the mobile station can detect in advance the increase / decrease tendency of the allowable transmission power in the specific area in which the mobile station is located or the allowable transmission power in the moving direction of the mobile station without using the control channel. For example, when the allowable transmission power of the specific area in the movement direction of the mobile station is small (for example, near the priority seat), the mobile station can reduce the transmission power of the mobile station in advance.
- traffic amount information (traffic congestion information) indicating an increase or decrease in traffic amount in the specific area may be used.
- the traffic volume may be expressed as 0 to 100%, the state with the least traffic volume may be 0%, and the state with the highest traffic volume may be 100%.
- the offset ⁇ f to be added to the relay signal is ⁇ f default + ⁇ f add in the same manner as in the above embodiment.
- ⁇ f add (traffic volume [%] ⁇ 100) [Hz]. Therefore, for example, ⁇ f in the case of 10% of traffic amount is ⁇ f default +1000 Hz.
- the mobile station can detect in advance the amount of traffic in the specific area in which the mobile station is located, or the tendency of the amount of traffic in the movement direction of the mobile station, without using a control channel.
- the base station in the above embodiment may be represented as Node B, and the mobile station may be represented as UE.
- the relay station in the above embodiment may be called a repeater, a simple base station, a cluster head or the like.
- the present invention is described using hardware as an example.
- the present invention can also be realized by software.
- Each function block employed in the description of each of the aforementioned embodiments may typically be implemented as an LSI constituted by an integrated circuit. These may be individually made into one chip, or may be made into one chip so as to include some or all. Although an LSI is used here, it may be called an IC, a system LSI, a super LSI, or an ultra LSI depending on the degree of integration.
- the method of circuit integration is not limited to LSI's, and implementation using dedicated circuitry or general purpose processors is also possible.
- a programmable field programmable gate array FPGA
- a reconfigurable processor may be used which can reconfigure connection and setting of circuit cells in the LSI.
- the present invention can be applied to a communication system (for example, a multi-hop system) in which a wireless communication apparatus such as a mobile station or a base station performs wireless communication via a relay station.
- a communication system for example, a multi-hop system
- a wireless communication apparatus such as a mobile station or a base station performs wireless communication via a relay station.
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Abstract
Description
本実施の形態では、中継される信号に周波数オフセットを付加する場合について説明する。
本実施の形態では、移動局が現在位置する特定エリア(中継局のカバーエリア)における危険度に対して、移動局の移動方向に位置する他の特定エリア(他の中継局)における危険度が増加しているか、または、減少しているかを示す、危険度の増減傾向に応じたオフセットが、中継される信号に付加される場合について説明する。
本実施の形態では、中継局20は、中継される信号の互いに異なる2つのリソース(周波数リソース、時間リソース、または、電力リソースのいずれか2つのリソース)に危険度情報が示す危険度に応じたオフセット、および、移動局30の移動方向における危険度の増減傾向に応じたオフセットをそれぞれ付加する。
Claims (5)
- 第1カバーエリアを有する基地局からの信号を受信する受信手段と、
前記第1カバーエリアに一部または全部が含まれる第2カバーエリアにおける、特定エリア情報が示す度合いに応じた、周波数オフセット、時間オフセット、または、電力オフセットのいずれかのオフセットを前記信号に付加する付加手段と、
前記第2カバーエリアにおいて、前記オフセットの付加後の信号を移動局へ送信する送信手段と、
を具備する中継局。 - 前記度合いは、前記第2カバーエリアにおける危険度である、
請求項1記載の中継局。 - 第1カバーエリアを有する基地局が送信した信号を前記第1カバーエリアにおいて受信するとともに、
前記第1カバーエリアに一部または全部が含まれる第2カバーエリアにおいて、中継局が中継した信号を受信する受信手段と、
受信信号に周波数オフセット、時間オフセット、または、電力オフセットのいずれかのオフセットが付加されている場合、前記オフセットに基づいて前記第2カバーエリアにおける、特定エリア情報が示す度合いを検出する検出手段と、
を具備する移動局。 - 第1カバーエリアを有する基地局と、
前記第1カバーエリアに一部または全部が含まれる第2カバーエリアを有し、前記第2カバーエリアにおける、特定エリア情報が示す度合いに応じて、周波数オフセット、時間オフセット、または、電力オフセットのいずれかのオフセットを前記基地局から受信された信号に付加し、前記オフセットの付加後の信号を前記第2カバーエリアに位置する移動局へ送信する中継局と、
受信信号に前記オフセットが付加されている場合、前記オフセットに基づいて前記度合いを検出する移動局と、
を具備する移動体通信システム。 - 第1カバーエリアを有する基地局から受信された信号に、前記第1カバーエリアに一部または全部が含まれる第2カバーエリアにおける、特定エリア情報が示す度合いに応じた、周波数オフセット、時間オフセット、または、電力オフセットのいずれかのオフセットを付加するステップと、
前記第2カバーエリアにおいて、前記オフセットの付加後の信号を移動局へ送信するステップと、
を具備する中継送信方法。
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JP2010500567A JP5328760B2 (ja) | 2008-02-27 | 2009-02-26 | 移動体通信システムにおける中継局、移動局および中継送信方法 |
US12/919,366 US8422943B2 (en) | 2008-02-27 | 2009-02-26 | Relay station in mobile communication system, mobile station, and relay transmission method |
EP09714035A EP2249595A1 (en) | 2008-02-27 | 2009-02-26 | Relay station in mobile communication system, mobile station, and relay transmission method |
CN2009801063058A CN101960876A (zh) | 2008-02-27 | 2009-02-26 | 移动通信系统中的中继站、移动台和中继发送方法 |
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