JP2011009820A - Radio communication system, mobile terminal and base station device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a radio communication system capable of enlarging cell radius and efficiently utilizing radio resources in compatible way.SOLUTION: The radio communication system includes an investigation means for investigating a time-based position relation between an up link sub-frame and a down link sub-frame for which transmission start timing is adjusted so as to cancel transmission delay with the base station device for each mobile terminal, present within a cell of the radio communication system to which a time division duplex operation system is applied; and an allocation control means for controlling the processing of allocating an area within the downlink sub-frame and the up link sub-frame to each mobile terminal by the base station device, on the basis of an investigation result.

Description

  The present invention relates to a radio communication system, a mobile terminal apparatus, and a base station apparatus that use a time division duplex (TDD) system as a duplex scheme for a radio section.

  In a radio communication system to which a time division duplex method is applied, each mobile terminal apparatus in a cell exchanges a transmission timing signal and a response signal with a base station apparatus, while the mobile terminal apparatus is in an uplink subframe. The timing to start transmission is adjusted. For example, when a response signal is not returned from the base station apparatus with respect to the transmission timing signal transmitted by itself, the mobile terminal apparatus adjusts the transmission start timing little by little. When receiving a response signal including a correction value indicating a difference from the expected timing from the base station apparatus, the mobile terminal apparatus adjusts the transmission start timing based on the correction value. By making such adjustments, each mobile terminal apparatus performs base station transmission of an uplink signal from each mobile terminal apparatus at a timing corresponding to an uplink subframe area allocated by the base station apparatus to each mobile terminal apparatus. It can reach the station device.

  The amount of adjustment of the transmission start timing applied to each mobile terminal increases as the distance between each terminal apparatus and the base station apparatus increases. Therefore, in the conventional wireless communication system, even in a mobile terminal device far from the base station device, the cell radius is set so that the uplink subframe and the downlink subframe whose transmission start timing is advanced as described above do not overlap. The switching time of the length according to is provided.

  In addition, as a technology related to the time division duplex method, for example, a technology for efficiently using radio resources according to traffic in both directions has been proposed by making it possible to change the ratio of uplink and downlink. (See Patent Document 1).

JP 2003-152622 A

  As described above, in the conventional wireless communication system, it is necessary to provide a switching time corresponding to the transmission delay when the distance between the mobile terminal device and the base station device becomes equal to the cell radius. For this reason, if the cell radius is to be increased, the switching time must be lengthened. Therefore, when the communication frame is the same, the time available for signal transmission as the uplink subframe and the downlink subframe is shortened. That is, in the conventional wireless communication system, when the cell radius is increased, a decrease in signal transmission efficiency cannot be avoided.

  An object of the present disclosure is to provide a radio communication system, a mobile terminal apparatus, and a base station apparatus that can achieve both expansion of a cell radius and efficient use of radio resources.

  The above-described object can be achieved by the wireless communication system disclosed below.

  A radio communication system according to one aspect starts transmission so as to cancel a transmission delay with a base station apparatus for each mobile terminal apparatus located in a cell of a radio communication system to which a time division duplex method is applied. Investigation means for investigating the temporal positional relationship between uplink subframes and downlink subframes whose timings have been adjusted, and based on the investigation results, the base station apparatus transmits downlink signals to individual mobile terminal apparatuses. Allocation control means for controlling a process of allocating areas in the subframe and the uplink subframe.

  The above-described object can also be achieved by a mobile terminal device disclosed below.

  A mobile terminal apparatus according to another aspect is a mobile terminal apparatus located in a cell of a wireless communication system to which a time division duplex method is applied, and is configured to cancel transmission delay with a base station apparatus. The timing adjustment unit that adjusts the transmission start timing of the subframe, and the temporal positional relationship between the adjusted uplink subframe and the downlink subframe that arrives from the base station apparatus is a time base that is a reference in the base station apparatus. An evaluation means for evaluating how much the position is deviated from the relative positional relationship, and the evaluation result by the evaluation means is notified to the base station apparatus using a radio signal, and the downlink subframe and the uplink subframe by the base station apparatus Notification means for use in area allocation processing.

  The above-described object can also be achieved by a base station apparatus disclosed below.

  A base station apparatus according to another aspect is a base station apparatus that exchanges radio signals with at least one mobile terminal apparatus located in a cell of a radio communication system to which a time division duplex method is applied. A timing adjustment instructing unit for instructing each mobile terminal device to adjust transmission start timing so as to cancel a transmission delay of an uplink frame signal coming from each mobile terminal device; Evaluation of the difference between the temporal positional relationship between the uplink subframe with the transmission start timing adjusted accordingly and the downlink subframe arriving from the base station device and the temporal positional relationship serving as a reference in the base station device Based on the extraction means for extracting the notification including the result from the radio signal from each mobile terminal device and the evaluation result on the difference notified from each mobile terminal device And a range specifying means for specifying a range that can be allocated to each mobile terminal apparatus for the downlink subframe and the uplink subframe, and the radio resource management unit provided in the base station apparatus A radio resource included in the range specified by the specifying means is allocated to each mobile terminal device.

  According to the radio communication system, the mobile terminal apparatus, and the base station apparatus configured as described above, it is possible to achieve both expansion of the cell radius and efficient use of radio resources.

1 is a functional block diagram of an embodiment of a wireless communication system. It is a figure explaining the temporal positional relationship of an up-and-down line sub-frame. It is a functional block diagram of one Embodiment of a mobile terminal device and a base station apparatus. It is a figure which shows one Embodiment of a mobile terminal device. It is a flowchart showing transmission start timing adjustment operation. It is a figure explaining the adjustment process of a transmission start timing. It is a figure which shows one Embodiment of a base station apparatus. It is a flowchart showing the allocation adjustment operation | movement of a radio | wireless resource. It is explanatory drawing of a radio | wireless resource allocation process. It is a figure which shows another embodiment of a mobile terminal device. It is a figure which shows another embodiment of a base station apparatus. It is a figure which shows another embodiment of a base station apparatus. It is a figure which shows another embodiment of a base station apparatus. It is a figure explaining radio | wireless resource allocation control.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

  FIG. 1 shows a functional block diagram of an embodiment of a wireless communication system.

  A time division duplex scheme is applied to the duplex scheme between the base station apparatus 100 and the plurality of mobile terminal apparatuses 120 shown in FIG. The investigation unit 111 illustrated in FIG. 1 may, for example, determine the timing at which a downlink subframe from the base station device 100 arrives at each mobile terminal device 120 and the transmission start timing of the uplink subframe adjusted by each mobile terminal device 120. Collect information that indicates Further, based on the collected information, the investigating unit 111 has, for each mobile terminal device 120, the positional relationship between the uplink subframe and the downlink subframe in the mobile terminal device 120 on the time axis. Investigate whether

  On the other hand, the allocation control means 112 shown in FIG. 1 is configured so that the base station apparatus 100 transmits the uplink subframe and downlink subframe areas to each mobile terminal apparatus 120 based on the investigation result obtained by the investigation means 111. Control the process of assigning.

  Here, based on the temporal positional relationship between the downlink subframe and the uplink subframe in each mobile terminal apparatus 120 investigated by the investigation unit 111 and the investigation result, how the allocation control unit 112 performs wireless communication. Whether to control resource allocation will be described.

  Since the distance between each mobile terminal apparatus 120 and the base station apparatus 100 varies, the transmission delay of the downlink subframe reaching the mobile terminal apparatus 120 is also applied to the transmission start timing of the uplink subframe. The amount is also different for each mobile terminal device 120.

  FIG. 2 is a diagram for explaining the distance between the mobile communication terminal device and the base station device and the temporal positional relationship between the uplink and downlink subframes.

  In FIG. 2A, the mobile terminal apparatus 1 is located closer to the base station apparatus than the predetermined distance R, while the distance between the mobile terminal apparatus 2 and the base station apparatus is larger than the distance R described above. It has become. Further, in the communication frame shown in FIG. 2B, a switching time corresponding to a transmission delay when the radio signal travels back and forth the distance R described above is provided between the downlink subframe and the uplink subframe. ing.

  FIGS. 2C and 2D show the positional relationship between the downlink subframe and the uplink subframe on the time axis in the two mobile terminal apparatuses 1 and 2 described above. . In FIG. 2, the temporal positions of the downlink subframe and the uplink subframe in mobile terminal apparatuses 1 and 2 are shown with reference to the temporal position in the base station apparatus. As shown in FIG. 2 (c), in the mobile terminal apparatus 1, between the downlink subframe that arrives with a delay of the transmission delay and the uplink subframe that has been issued in order to cancel the transmission delay. There is a time gap. On the other hand, since the mobile terminal apparatus 2 has a large transmission delay and an adjustment amount for quick start, as shown in FIG. 2 (d), the latter half of the downlink subframe and the uplink subframe An overlapping period occurs in which the first half of each overlaps.

  Thus, in each mobile terminal apparatus 120, the positional relationship that the downlink subframe and the uplink subframe occupy on the time axis differ depending on the distance from the base station apparatus 100.

  The investigating unit 111 includes, for example, whether or not the above-described overlap period has occurred in each mobile terminal device 120 based on information collected from each mobile terminal device 120, Investigate the positional relationship that the uplink subframe occupies on the time axis. Therefore, the investigation result by the investigation means 111 includes information indicating whether or not there is an overlapping period, and information indicating the length of the overlapping period when there is an overlapping period. The detection means 113 shown in FIG. 1 performs such overlapping period detection processing as part of the investigation processing by the investigation means 111, and passes the detection result to the allocation control means 112 as part of the investigation result. Note that the investigation result passed from the investigation unit 111 to the allocation control unit 112 may include information indicating the degree of time closeness of the downlink subframe and the uplink subframe.

  By the way, as shown in FIG. 2 (d), even when there is an overlap period between the downlink subframe and the uplink subframe, by devising an area to be allocated to the mobile terminal apparatus 2, time division duplexing can be performed. Duplex communication by the method can be realized.

  For example, if the area allocated to the mobile terminal apparatus 2 in the downlink subframe or the uplink subframe is set avoiding the above-described overlap period, duplex communication between the mobile terminal apparatus 2 and the base station apparatus is possible. Become.

  In the allocation control means 112 shown in FIG. 1, the base station apparatus 100 overlaps at least one of the uplink subframe and the downlink subframe with respect to the mobile terminal apparatus 120 notified of the overlap period by the detection means 113. Control to allocate the area avoiding the period. Further, the allocation control unit 112 receives a survey result including information indicating the degree of time closeness of the downlink subframe and the uplink subframe from the survey unit 111, and based on this, the base station apparatus The allocation process by 100 can also be controlled.

  In addition, the temporary allocation unit 114 illustrated in FIG. 1 transmits, to the mobile terminal device 120 whose transmission delay is unknown, via the base station device 100, the first half area of the downlink subframe and the uplink subframe. Control is performed to temporarily allocate the second half area.

  Thereby, transmission / reception of data between the mobile terminal apparatus 120 and the base station apparatus 100 can be enabled regardless of the distance between the mobile terminal apparatus 120 and the base station apparatus 100 that newly start wireless communication. Then, after checking the temporal positional relationship between the downlink subframe and the uplink subframe described above in the process of adjusting the transmission start timing by the investigating unit 111, Thus, appropriate areas of the downlink subframe and the uplink subframe can be allocated.

  1 can be shared by the base station apparatus 100 and the plurality of mobile terminal apparatuses 120.

  FIG. 3 shows a functional block diagram of an embodiment of a mobile terminal device and a base station device.

  In the example shown in FIG. 3, the function of the investigation unit 111 is shared by the evaluation unit 122 and the notification unit 123 provided in each mobile terminal device 120. On the other hand, the function of the allocation control unit 112 can be realized by the extraction unit 102 and the region allocation unit 103 provided in the base station apparatus 100.

  In FIG. 3, the timing adjustment section 121 provided in each mobile terminal apparatus 120 adjusts the transmission start timing of the uplink subframe according to the instruction from the timing adjustment instruction section 101 provided in the base station apparatus 100. . In this process, the evaluation means 122 determines how much the temporal positional relationship between the downlink subframe and the uplink subframe is deviated from the reference positional relationship in the base station apparatus 100 in each mobile terminal apparatus 120. To evaluate. For example, the evaluation unit 122 obtains the sum of the transmission delay of the downlink subframe and the amount of early transmission of the uplink subframe shown in FIGS. This sum indicates the amount of deviation between the positional relationship between the downlink subframe and the uplink subframe in the mobile terminal devices 1 and 2 and the reference positional relationship in the base station apparatus shown in FIG. Yes. When this amount of deviation exceeds the switching time described above, the downlink subframe and the uplink subframe have overlapping periods.

  In this way, the amount of deviation obtained by the evaluation unit 122 is notified to the base station apparatus 100 by the notification unit 123 and passed to the area allocation unit 103 via the extraction unit 102. For example, when the received shift amount exceeds the switching time, the area allocation unit 103 determines that an overlapping period has occurred in the mobile terminal device 120. In this case, the area allocating unit 103 determines an area to be allocated to the mobile terminal apparatus 120 while avoiding an overlap period for at least one of the downlink subframe and the uplink subframe. Based on this determination, the radio resource management unit 104 allocates radio resources corresponding to the determined area to the mobile terminal device 120 in which the overlap period is detected.

  Note that the evaluation unit 122 or the notification unit 123 can also compare the amount of deviation obtained by the evaluation unit 122 and the switching time as described above. And when the duplication period has arisen, the mobile terminal apparatus 120 can also be comprised so that the information which shows the time position of this duplication period may be notified to the base station apparatus 100. FIG.

  For example, the base station apparatus 100 can be notified that the N symbols at the end of the downlink subframe and the N symbols at the beginning of the uplink subframe overlap, and can be used for the control of the area allocation means 103.

  On the other hand, on the base station apparatus 100 side, based on the instruction sent from the timing adjustment instruction unit 101 to each mobile terminal apparatus 120, the above-described positional relationship shift amount can be obtained for each mobile terminal apparatus 120. In this way, the function of the investigation unit 111 can be shared by the base station apparatus 100.

Various embodiments of the wireless communication system will be described below.
(Embodiment 1)
FIG. 4 shows an embodiment of a mobile terminal device.

  The radio signal arriving at the mobile terminal apparatus 120 shown in FIG. 4 is received by the radio transmission / reception unit 211, and the obtained reception signal is passed to the separation unit 212. The separation unit 212 separates the configuration information from the received signal, and holds the separated configuration information in the configuration information holding unit 221. This configuration information includes information indicating allocation of areas to each mobile terminal apparatus for the downlink subframe and the uplink subframe.

  The downlink subframe includes configuration information related to the downlink subframe and configuration information related to the uplink subframe. Each piece of configuration information includes information indicating the position and size on the time axis and the frequency axis of each region allocated to each mobile terminal apparatus 120 in the uplink / downlink subframe and the allocation destination mobile terminal apparatus 120. Yes. In addition, the configuration information also includes information related to a region used for exchanging transmission timing signals and response signals for transmission start timing adjustment in each mobile terminal apparatus 120.

  Based on this configuration information, demultiplexing section 212 demultiplexes the received signal corresponding to the downlink subframe area allocated to mobile terminal apparatus 120 and the response signal to the transmission timing signal. For example, the demultiplexing unit 212 demultiplexes received signals from downlink subframes in units of blocks, which are units in which the base station apparatus 100 allocates radio resources to each mobile terminal apparatus 120. The separated received signal is decoded by the decoding processing unit 213. The reception data obtained by the decoding process is passed to the terminal control unit 214 and provided to the user via the liquid crystal display unit 215 and the speaker 216.

  On the other hand, transmission data including information and audio signals input via the operation panel unit 217 or the microphone 218 is passed to the encoding processing unit 219 via the terminal control unit 214 and is encoded by the encoding processing unit 219. Is done. The encoded data is assigned by the multiplexing unit 220 to a corresponding region of the uplink subframe based on the configuration information held in the configuration information holding unit 221, and is wirelessly transmitted via the wireless transmission / reception unit 211. The

  Also, the timing adjustment section 121 shown in FIG. 4 performs uplink sub-frames in the mobile terminal apparatus 120 based on the reception timing and configuration information of the synchronization signal included in the downlink sub-frame and the response signal from the base station apparatus 100. Adjust the frame transmission start timing.

FIG. 5 is a flowchart showing the transmission start timing adjustment operation. FIG. 6 is a diagram for explaining the transmission start timing adjustment process.
The timing adjustment unit 121 calculates the time point when the downlink subframe and the switching time T _GAP have elapsed from the reception timing of the synchronization signal described above as the initial value of the transmission start timing of the uplink subframe (step 301 in FIG. 5). The adjustment described later is performed.

  Based on this transmission start timing, the timing adjustment unit 121 calculates the timing in the region assigned to the transmission timing signal based on the configuration information, and transmits the transmission timing signal via the wireless transmission / reception unit 211 at this timing ( Step 302).

  Here, when there is a transmission delay that cannot be ignored between the mobile terminal device 120 and the base station device 100, the transmission timing signal transmitted at the timing calculated based on the initial value described above is transmitted to the base station device 100. It is not reached at the expected timing. In this case, the base station apparatus 100 does not return a response signal for the transmission timing signal.

  As described above, when a response signal is not returned from the base station apparatus 100 with respect to the transmission timing signal (No determination in step 303), the timing adjustment unit 121 performs adjustment to advance the transmission start timing by a predetermined time ts ( Step 304).

  The adjustment amount integration unit 222 shown in FIG. 4 integrates the adjustment amount every time the transmission start timing is adjusted by the timing adjustment unit 121 (step 305).

  After that, the timing adjustment unit 121 returns to step 302 to calculate the timing in the region newly assigned to the transmission timing signal based on the adjusted transmission start timing, and at this timing, the timing adjustment unit 121 passes the radio transmission / reception unit 211. To transmit a transmission timing signal. By repeating the operations of Step 302 to Step 305 described above, the timing adjustment unit 121 roughly adjusts the transmission start timing of the uplink subframe in the mobile terminal apparatus 120.

  When the transmission timing signal whose transmission timing is adjusted in this way reaches the range set on the base station apparatus 100 side, a response signal is returned from the base station apparatus 100. At this time, the timing adjustment unit 121 starts adjustment based on the response signal as an affirmative determination in step 303.

  The timing adjustment unit 121 first determines whether or not a correction value is included in the response signal (step 306). When the correction value tc is included in the response signal (affirmative determination in step 306), the timing adjustment unit 121 adjusts the transmission start timing based on the correction value tc. Then, the correction value tc is added to the integrated value of the adjustment amount so far by the adjustment amount integration unit 222 (step 305). After that, the timing adjustment unit 121 returns to step 302 and transmits a transmission timing signal based on the transmission start timing adjusted based on the correction value tc described above. As described above, after the response signal is returned, the timing adjustment unit 121 repeats the exchange of the transmission timing signal and the corresponding response signal, and precisely adjusts the transmission start timing.

  When the response signal described above indicates that the adjustment of the transmission start timing is completed (No in Step 306), the timing adjustment unit 121 ends the adjustment process of the transmission start timing of the uplink subframe. . At this time, the adjustment amount integration unit 222 passes the adjustment amount integration result to the overlap determination unit 223.

  For example, FIGS. 6B and 6C show transmission of uplink subframes when the mobile terminal apparatus 120 has a transmission delay D1 from the communication frame timing in the base station apparatus 100 shown in FIG. 6A. The state of the start timing adjustment is shown. FIGS. 6D and 6E show the state of transmission start timing adjustment of the uplink subframe when mobile terminal apparatus 120 has transmission delay D2 from the timing of the communication frame in base station apparatus 100. . 6B and 6D show the temporal positional relationship between the downlink subframe and the uplink subframe when the respective transmission start timing adjustment operations are started. FIGS. 6C and 6E show temporal positional relationships between the downlink subframe and the uplink subframe when the transmission start timing adjustment operation is completed.

FIG. 6 (b), the integration result obtained by the adjustment amount integrating section 222 to the examples shown (c), the transmission start timing and FIG uplink subframe indicated at R ₁ in FIG. 6 (b) 6 ( This corresponds to the difference C1 from the transmission start timing of c). This difference C1 is determined by the transmission amount D1 until the downlink subframe arrives, and the early portion of the base station apparatus 100 shown in FIG. 6A with reference to the reception start timing _R0 of the uplink subframe. Contains. That is, the integration result obtained by the adjustment amount integrating unit 222 indicates that the temporal positional relationship between the downlink subframe and the uplink subframe in the mobile terminal device 120 is shifted with respect to the positional relationship in the base station device 100. It shows how. As described above, in the embodiment shown in FIG. 4, the adjustment amount accumulating unit 222 provided in the mobile terminal apparatus 120 uses the temporal position reference of the downlink subframe and the uplink subframe in the mobile terminal apparatus 120. The amount of deviation from is required.

  6A and 6C, it can be seen that the downlink subframe shown in FIG. 6C is advanced by an amount corresponding to the transmission delay D1. Thereby, the transmission delay between the base station apparatus 100 and the mobile terminal apparatus 120 is cancelled.

Similarly, FIG. 6 (d), the accumulation result obtained by the adjustment amount integrating section 222 to the examples shown in (e) includes a transmission start timing of the uplink sub-frame indicated by symbol R ₂ in FIG. 6 (d) This corresponds to the difference C2 from the transmission start timing in FIG. In the example shown in FIG. 6 (e), the base station apparatus sets the transmission start timing of the uplink subframe earlier than the reception start timing _R0 in the base station apparatus 100 by an amount corresponding to the transmission delay D2. The transmission delay between 100 and the mobile terminal device 120 is cancelled.

The overlap determination unit 223 shown in FIG. 4 compares the result of the adjustment amount obtained as described above with the switching time T _GAP , so that the mobile terminal device 120 uses the downlink subframe and the uplink subframe. It is determined whether or not there is a period in which.

For example, as illustrated in FIG. 6C, when the adjustment amount integration result C1 is smaller than the switching time T _GAP , the overlap determination unit 223 causes the downlink subframe and the uplink subframe to overlap. Judge that there is no. On the other hand, as shown in FIG. 6 (e), when the adjustment amount integration result C2 is larger than the switching time T _GAP , the overlap determination unit 223 causes the downlink subframe and the uplink subframe to overlap. Judge that

  In this way, when an overlapping period is detected, the notification processing unit 224 creates a notification message including information indicating the length of the overlapping period received from the duplication determination unit 223, for example, and transmits the notification message to the mobile terminal apparatus. The data is transferred to the encoding processing unit 219 as a part of the transmission data from 120. In this case, the encoding processing unit 219 generates encoded data corresponding to transmission data including information indicating the length of the overlap period. This encoded data is inserted into the uplink subframe area allocated to mobile terminal apparatus 120 by multiplexing section 220 and wirelessly transmitted to base station apparatus 100 via wireless transmission / reception section 211.

  As described above, in the embodiment illustrated in FIG. 4, with respect to the integration result obtained by the adjustment amount integration unit 222, the base station apparatus 100 uses, as an evaluation result, the result of determining the occurrence of the overlap period described above by the overlap determination unit 223. To notify. That is, in the embodiment illustrated in FIG. 4, the function of the evaluation unit 122 illustrated in FIG. 3 is realized by the adjustment amount accumulation unit 222 and the overlap determination unit 223. Further, the notification processing unit 224 wirelessly transmits information indicating the overlapping period obtained by the duplication determination unit 223 as part of the transmission data of the mobile terminal device 120, so that the function of the notification unit 123 illustrated in FIG. It has been realized.

  Note that the embodiment of the mobile terminal apparatus 120 shown in FIG. 4 can also be viewed as an example of a configuration in which the function of the detection means 113 included in the investigation means 111 shown in FIG. Further, the information indicating the overlapping period notified to the base station apparatus 100 may be numerical data indicating the length of the overlapping period, or may be information representing the overlapping period by the number of symbols.

  In addition, the transmission start timing adjustment process based on the exchange of the transmission timing signal and the response signal described above is periodically performed while wireless communication between the base station apparatus 100 and the mobile terminal apparatus 120 is continued. Thereby, the change in the distance between the mobile terminal apparatus 120 and the base station apparatus 100 is reflected in the transmission start timing of the downlink subframe of the mobile terminal apparatus 120. When the overlap period as described above is detected due to a change in the distance between the mobile terminal apparatus 120 and the base station apparatus 100, the mobile terminal apparatus 120 notifies the base station apparatus 100 including information indicating the overlap period. A message is sent out.

  Next, the base station apparatus 100 will be described. FIG. 7 shows an embodiment of the base station apparatus.

  The radio signal arriving at the base station apparatus 100 illustrated in FIG. 7 is received by the radio transmission / reception unit 231, and the obtained reception signal is passed to the separation unit 232. Based on the configuration information held in the configuration information holding unit 236, the separation unit 232, for example, separates the received signal corresponding to each block that is a unit in which the base station device 100 allocates radio resources to each mobile terminal device 120. . The reception signal separated in this way is decoded by the decoding processing unit 233. Received data obtained by the decoding process is passed to the base station control unit 234. Of the received data, data sent to the communication network is passed to a higher-level device (not shown) such as a base station control device by the base station control unit 234. On the other hand, the received data destined for the base station apparatus 100 is used for processing inside the base station control unit 234.

  Transmission data from the communication network received via the host device and transmission data including control information obtained as a result of processing by the base station control unit 234 are passed to the encoding processing unit 235, and are encoded by the encoding processing unit 235. It becomes. The encoded data is assigned by the multiplexing unit 237 to the corresponding region of the downlink subframe based on the configuration information held in the configuration information holding unit 236, and is wirelessly transmitted via the radio transmission / reception unit 231. The

  The timing adjustment instructing unit 101 illustrated in FIG. 7 sets a range including the time that the transmission timing signal from each mobile terminal apparatus 120 should reach based on the configuration information described above. When the transmission timing is detected within this range, the wireless transmission / reception unit 231 generates a response signal including a correction value indicating a difference from the timing expected from the configuration information. This response signal is encoded by the encoding processing unit 235, inserted into the corresponding region of the downlink subframe by the multiplexing unit 237, and wirelessly transmitted via the wireless transmission / reception unit 231.

  Hereinafter, a method for adjusting radio resource allocation in base station apparatus 100 based on the overlap period notified from mobile terminal apparatus 120 will be described.

  FIG. 8 is a flowchart showing the radio resource allocation adjustment operation. FIG. 9 is an explanatory diagram of radio resource allocation processing.

  In addition, the notification extraction unit 238 illustrated in FIG. 7 extracts, for example, a notification message including information indicating an overlapping period detected in each mobile terminal device 120 from the reception data decoded by the decoding processing unit 233 (FIG. 7). 8 step 311). When a notification message including information indicating the overlap period is extracted, the allocation adjustment unit 239 determines that there is a mobile terminal apparatus having the overlap period (Yes determination in step 312).

  At this time, based on the extracted notification message, the allocation adjustment unit 239 specifies a range that can be allocated for each of the mobile terminal apparatus 120 in which the overlap period is detected for the downlink subframe and the uplink subframe (Step S1). 313). Information indicating the assignable range specified in this way is provided to a radio resource allocation process by the radio resource management unit 104.

  For example, for the downlink subframe and the uplink subframe, the allocation adjustment unit 239 specifies a range excluding the part included in the notified overlap period as an assignable range, and information indicating this range is assigned to the radio resource management unit 104. In this case, as shown in FIG. 9A, allocation adjustment section 239 specifies a range close to the beginning of the downlink subframe and a range close to the end of the uplink subframe as assignable ranges.

  In addition, the allocation adjustment unit 239 can set a range other than the overlap period as an assignable range for the downlink subframe or the uplink subframe. For example, as shown in FIG. 9B, the entire range can be assigned to the downlink subframe, and the range not included in the overlap period can be assigned to the uplink subframe. When such a range can be allocated, it is possible to ensure the degree of freedom of radio resource allocation for downlink subframes. For this reason, the method of specifying the assignable range as described above is suitable when an operation mode that prioritizes data reception is applied to the mobile terminal device 120 in which the overlap period is detected. Conversely, as shown in FIG. 9C, the entire range can be assigned for the uplink subframe, and the range not included in the overlap period can be made the assignable range for the downlink subframe. . When such a range can be allocated, it is possible to ensure the degree of freedom of radio resource allocation for uplink subframes. For this reason, the method of specifying the assignable range as described above is suitable when an operation mode in which priority is given to data transmission is applied to the mobile terminal apparatus 120 in which the overlap period is detected.

  On the other hand, when there is no mobile terminal apparatus 120 in which the overlap period is detected (No in Step 312), the allocation adjustment unit 239 indicates that the allocation range corresponding to each mobile terminal apparatus 120 is not limited. The radio resource management unit 104 may be notified.

  The radio resource management unit 104 determines an allocation area to each mobile terminal device 120 based on the information notified from the allocation adjustment unit 239 (step 314). For example, the radio resource management unit 104 can determine an allocation area in the following procedure. First, the radio resource management unit 104 determines an allocation area within the notified allocatable range for the mobile terminal device 120 whose allocation range is limited to a specific area. Next, the radio resource management unit 104 determines an allocation area for the mobile terminal device 120 whose allocation range is not limited to a specific area.

  Next, the radio resource management unit 104 updates the configuration information in the configuration information holding unit 236 based on the area allocation determined as described above (step 315), and ends the allocation process. The configuration information updated in this way is inserted into the downlink subframe of the communication frame by the multiplexing unit 237 and wirelessly transmitted to each mobile terminal apparatus 120. Note that the multiplexing unit 237 can also insert the updated configuration information into the communication frame as configuration information that becomes valid from the next communication frame.

  In this way, when information indicating the detected overlapping period is notified from the mobile terminal apparatus 120, the allocation of radio resources to the mobile terminal apparatus 120 is changed so as to avoid the notified overlapping period. Can do.

  Thereby, for example, when the user moves, the distance between the mobile terminal device 120 and the base station device 100 increases, and therefore, even when the overlap period as described above occurs, the mobile terminal device 120 and the base station device Wireless communication with the station device 100 can be maintained.

  The notification extraction unit 238 illustrated in FIG. 7 corresponds to the extraction unit 102 illustrated in FIG. The allocation adjustment unit 239 corresponds to the area allocation unit 103. Also, the embodiment of the base station apparatus 100 shown in FIG. 7 can be regarded as a configuration in which the allocation control means 112 shown in FIG.

  By applying such radio resource allocation adjustment, the round-trip transmission delay between the base station apparatus 100 and the mobile terminal apparatus 120 exceeds the switching time while fixing the switching time provided in the communication frame. Even in this case, wireless communication can be maintained. That is, in the radio communication system shown in FIG. 1 and its modification, the cell radius can be expanded while maintaining the use efficiency of radio resources.

  In addition, when the mobile terminal apparatus 120 detects the above-described overlap period, the base station apparatus 100 can be notified of a range to avoid allocation or a range in which allocation is desired for the downlink subframe or the uplink subframe. .

  For example, the notification processing unit 224 creates a notification message including information indicating a range for avoiding allocation or a range for which allocation is desired instead of the information indicating the overlapping period, and uses the notification message as a part of transmission data. Can be sent out. At this time, for example, the notification processing unit 224 receives information on the operation mode applied to the mobile terminal device 120 from the terminal control unit 214, and avoids allocation based on this information and the detected overlap period. The (or desired) range can be determined. For example, when an operation mode that prioritizes data reception is applied to the mobile terminal device 120, the notification processing unit 224 indicates a range corresponding to the overlapping period from the beginning of the uplink subframe as a range to avoid allocation. Notification messages can be created. On the other hand, when the operation mode giving priority to data transmission is applied to the mobile terminal device 120, the notification processing unit 224 indicates the range corresponding to the overlapping period at the end of the downlink subframe as a range to avoid allocation. Notification messages can be created. Further, when notifying the range desired to be allocated, the notification processing unit 224 may similarly create a notification message indicating a range that is not included in the overlap period in each subframe.

  In addition, the range for avoiding the above-described assignment is determined so as to include the time required for switching the operation from the reception of the downlink subframe signal to the transmission of the uplink subframe signal in mobile terminal apparatus 120. Also good.

Furthermore, when the difference between the integration result by the adjustment amount integration unit 222 and the above-described switching time T _GAP becomes equal to or less than the predetermined threshold Th, the overlap determination unit 223 detects the possibility that an overlap period will occur. You can also. Then, the notification processing unit 224 can create a notification message indicating the detection result and notify the base station device 100 of the notification message.

  The notification message created in this way reflects the operation mode applied to each mobile terminal device 120.

  Therefore, the allocation adjustment unit 239 of the base station apparatus 100 may notify the radio resource management unit 104 of a range other than the range avoiding the allocation indicated in the notification message as an assignable range.

  As described above, in the configuration in which the function of the investigation unit 111 shown in FIG. Resource allocation can be finely controlled.

On the other hand, a part of the function of the investigation means 111 shown in FIG.
(Embodiment 2)
FIG. 10 is a diagram showing another embodiment of the mobile terminal device. FIG. 11 is a diagram illustrating another embodiment of the base station apparatus.

  Note that, among the components shown in FIGS. 10 and 11, the same components as those shown in FIGS. 4 and 7 are denoted by the same reference numerals, and description thereof is omitted.

  In the mobile terminal device 120 shown in FIG. 10, the integration result obtained by the adjustment amount integration unit 222 is passed to the notification processing unit 224 as it is, and the notification processing unit 224 includes a notification message including information indicating the adjustment amount integration result. Is created.

  In the base station apparatus 100 illustrated in FIG. 11, the notification extraction unit 238 extracts a notification message including the adjustment amount integration result from each mobile terminal apparatus 120. Based on the integration result of the extracted adjustment amounts, the overlap determination unit 240 determines whether or not the above-described overlap period occurs in each terminal device 120. Then, based on the determination result by the duplication determination unit 240, the allocation adjustment unit 239 determines a range that can be allocated for the mobile terminal device 120 in which the duplication period is detected, and performs the processing of the radio resource management unit 104. Provide.

  In this case, for example, the allocation adjustment unit 239 notifies the radio resource management unit 104 of a range excluding the range included in the overlap period as a possible allocation range for both the downlink subframe and the uplink subframe. be able to.

  If radio resources within the allocatable range determined in this way are allocated to mobile terminal apparatus 120, radio communication can be reliably maintained regardless of which data transmission / reception is prioritized in mobile terminal apparatus 120. .

  In the embodiment of the base station apparatus shown in FIG. 11, the base station apparatus 100 is provided with a function of detecting the occurrence of an overlapping period for each mobile terminal apparatus 120 among the functions of the detection means 113 shown in FIG. 1. This is realized by the notification extraction unit 238 and the duplication determination unit 240.

Further, the transmission and reception of transmission timing signals and response signals are periodically performed between the base station apparatus 100 and each mobile terminal apparatus 120, so that the base station apparatus 100 side can transmit and receive uplinks and downlinks in each mobile terminal apparatus 120. It is also possible to examine changes in the subframe positional relationship.
(Embodiment 3)
FIG. 12 shows another embodiment of the base station apparatus.

  Note that among the constituent elements shown in FIG. 12, the same constituent elements as those shown in FIG. 7 and FIG. 11 are denoted by the same reference numerals, and description thereof is omitted.

  The base station apparatus 100 illustrated in FIG. 12 replaces the notification extraction unit 238, the overlap determination unit 240, and the allocation adjustment unit 239 illustrated in FIG. 11 with a correction value integration unit 241, an integration value holding unit 242, and an integration value analysis unit. 243.

  The correction value accumulating unit 241 collects correction values instructed by the response signal for each mobile terminal device 120 from the timing adjustment instruction unit 101. Further, the correction value integrating unit 241 adds the newly collected correction value to the integrated value held corresponding to each mobile terminal device 120 in the integrated value holding unit 242, and the addition result is added to the integrated value holding unit 242. Held corresponding to each mobile terminal apparatus 120.

  The correction value instructed to each mobile terminal apparatus 120 by the response signal indicates a difference between the timing when the transmission timing signal from the mobile terminal apparatus 120 actually reaches the base station apparatus 100 and the expected timing. . For this reason, when the transmission delay between the mobile terminal apparatus 120 and the base station apparatus 100 changes due to the movement of the mobile terminal apparatus 120 in the cell, this change is caused by the response signal returned to the mobile terminal apparatus 120. It is reflected in the correction value. Therefore, the amount of change in transmission delay between the mobile terminal apparatus 120 and the base station apparatus 100 can be obtained by integrating the correction values.

  The integrated value analysis unit 243 determines whether or not to change the radio resource allocated to each mobile terminal device 120 based on the integrated value of the correction value stored for each mobile terminal device 120 in the integrated value holding unit 242. Determine the contents of

  For example, the integrated value analysis unit 243 detects the mobile terminal device 120 with a large amount of change in transmission delay based on the result of comparing the absolute value of the integrated value corresponding to each mobile terminal device 120 with a predetermined threshold value.

  Then, based on the detected sign of the integrated value corresponding to mobile terminal apparatus 120, integrated value analyzing section 243 changes the area allocated to mobile terminal apparatus 120 for the uplink subframe and the downlink subframe. Request.

  For example, the integrated value analysis unit 243 can request the radio resource management unit 104 to make the following change for the mobile terminal device 120 whose transmission delay is indicated by the code of the integrated value. . The integrated value analysis unit 243 may request to change the allocation of radio resources so that the area allocated to the mobile terminal apparatus 120 is closer to the head in the downlink subframe and closer to the tail in the uplink subframe. Conversely, for the mobile terminal device 120 whose transmission delay is reduced, the integrated value analysis unit 243 brings the area allocated to the mobile terminal device 120 closer to the end in the downlink subframe, while in the uplink subframe, You can also request a change to get closer to.

  In this way, the function of the investigation means 111 shown in FIG. 1 can be realized using the components of the base station apparatus 100.

  In the radio communication system provided with the base station apparatus 100 shown in FIG. 12, both the investigation means 111 and the allocation control means 112 are shared by the base station apparatus 100. Therefore, it is possible to examine the positional relationship between the downlink subframe and the uplink subframe in each mobile terminal device without increasing the processing load on the mobile terminal device. In addition, since it is not necessary to add a new function to the mobile terminal apparatus 120, it is possible to achieve both maintenance of radio resource utilization efficiency and expansion of the cell radius even in a radio communication system including an existing mobile terminal apparatus. it can.

In addition, it is possible to limit the area of the communication frame initially allocated to the mobile terminal apparatus 120 by the base station apparatus 100 and to stabilize data transmission / reception from the beginning of communication.
(Embodiment 4)
FIG. 13 shows another embodiment of the base station apparatus.

  13 that are the same as those shown in FIG. 7 are denoted by the same reference numerals and description thereof is omitted.

  In the base station apparatus 100 shown in FIG. 13, an instruction from the base station control unit 234 to allocate radio resources to a new mobile terminal apparatus is passed to the radio resource management unit 104 via the temporary allocation instruction unit 244. It is.

  When the temporary allocation instruction unit 244 receives an instruction from the base station control unit 234 to allocate radio resources to a new mobile terminal device, the temporary allocation instruction unit 244 notifies the radio resource management unit 104 of the mobile terminal device 120 to be allocated. To assign an area from a predetermined range of the communication frame.

  For example, the temporary allocation instructing unit 244 instructs a range as shown by hatching in FIG. 14A as a temporary allocation range to be specified when radio resources are allocated to a new mobile terminal device. Can do. In FIG. 14 (a), the temporary allocation range of the downlink subframe is set following an area in which control information such as a synchronization signal, configuration information, and response signal is arranged. Also, the temporary allocation range of the uplink subframe is set on the front side of the reception period of the transmission timing signal set at the end. Note that the temporary allocation range may be set to a range that is not included in the overlap period even when a transmission delay corresponding to the expanded cell radius occurs.

  In the embodiment shown in FIG. 13, the radio resource management unit 104 allocates a temporary allocation range area to the new mobile terminal device 120 in response to an instruction from the temporary allocation instruction unit 244, so that the temporary allocation shown in FIG. The function of the means 114 is realized.

  As described above, at the start of communication, radio resources are allocated to the mobile terminal device 120 whose transmission delay is unknown from the temporary allocation range described above, so that the mobile terminal device 120 at an arbitrary position in the expanded cell can be communicated. Can send and receive data stably.

  Thereafter, after going through the process of adjusting the transmission start timing of the uplink subframe, the allocation of radio resources to the mobile terminal apparatus 120 can be changed based on the notification from the mobile terminal apparatus 120.

  For example, when the overlap period is not notified from the mobile terminal apparatus 120, the allocation adjustment unit 239 sets the second half of the downlink subframe and the first half of the uplink subframe as the assignable ranges to the radio resource management unit 104. Notice.

  FIG. 14 (b) shows an example of changing the assignment performed when it is determined that the downlink subframe and the uplink subframe have a positional relationship that does not overlap. In the example of FIG. 14 (b), an area indicated by hatching from the above-described allocatable range instead of the area indicated by the dotted line included in the temporary allocation range is assigned to the mobile terminal device 120 by the allocation changing process. Assigned.

  By changing the area allocated to the mobile terminal apparatus 120 that has been found to be relatively close to the base station apparatus 100 in this way, a free area is secured in the first half of the downlink subframe and the second half of the uplink subframe. I can keep it.

  When the overlapping period is notified from the mobile terminal device 120, the allocation adjusting unit 239 determines the allocatable range by excluding the notified overlapping period and the temporary allocation range described above, and designates this allocatable range. Then, the wireless resource management unit 104 is requested to change the assignment.

  FIG. 14C shows an example of allocation change performed in response to a request from the allocation adjustment unit 239 when it is determined that the positional relationship is such that the downlink subframe and the uplink subframe overlap. In the example of FIG. 14C, the overlap period is shown with shading. In this example, as a result of the allocation change process, instead of the area indicated by the dotted line included in the temporary allocation range, the area indicated by hatching from the assignable range described above is allocated to the mobile terminal device 120.

  By changing the area allocated to the mobile terminal apparatus 120 that has been found to have a large transmission delay with the base station apparatus 100 in this way, it is possible to control the temporary allocation range not to be occupied.

Regarding the above description, the following items are further disclosed.
(Appendix 1)
Uplink subframe in which transmission start timing is adjusted so as to cancel transmission delay with the base station apparatus for each mobile terminal apparatus located in a cell of a radio communication system to which time division duplex is applied Survey means for investigating the temporal positional relationship between the subframe and the downlink subframe,
The base station apparatus includes: an allocation control unit that controls a process of allocating regions in the downlink subframe and the uplink subframe to the individual mobile terminal apparatuses based on the investigation result. A wireless communication system.
(Appendix 2)
The investigation means comprises detection means for detecting an overlap period in which uplink subframes and downlink subframes overlap in time in each mobile terminal device,
The allocation control means performs control for allocating at least one of a downlink subframe area and an uplink subframe area while avoiding the overlap period to a mobile terminal apparatus in which the overlap period is detected. The wireless communication system according to Supplementary Note 1.
(Appendix 3)
Provisional allocating means for tentatively allocating a region belonging to the first half of the uplink subframe and a region belonging to the second half of the downlink subframe to the mobile terminal device whose transmission delay is unknown via the base station device; The wireless communication system according to Supplementary Note 1, wherein
(Appendix 4)
A mobile terminal device located in a cell of a wireless communication system to which a time division duplex method is applied,
A timing adjustment unit that adjusts the transmission start timing of the uplink subframe so as to cancel the transmission delay with the base station device;
Evaluation means for evaluating a difference between a temporal positional relationship between the adjusted uplink subframe and a downlink subframe coming from the base station device, and a temporal positional relationship serving as a reference in the base station device When,
A notification means for notifying the evaluation result by the evaluation means to the base station apparatus using a radio signal and for allocating areas in the downlink subframe and the uplink subframe by the base station apparatus; A mobile terminal device.
(Appendix 5)
The evaluation unit includes an overlap determination unit that detects an overlap period in which an uplink subframe and a downlink subframe overlap in time, and information indicating the overlap period is detected when the overlap period is detected. The mobile terminal apparatus according to appendix 4, wherein the mobile terminal apparatus is subjected to a notification process by the notification means as an evaluation result.
(Appendix 6)
The evaluation unit includes an overlap determination unit that detects an overlap period in which uplink subframes and downlink subframes overlap in time, and when the overlap period is detected, allocation avoidance including the overlap period is avoided. The mobile terminal apparatus according to appendix 4, wherein information indicating a range is provided as an evaluation result to a notification process by the notification unit.
(Appendix 7)
The evaluation means includes an overlap determination unit that detects an overlap period in which an uplink subframe and a downlink subframe overlap in time, and when the overlap period is detected, a request that does not include the overlap period The mobile terminal apparatus according to appendix 4, wherein information indicating the allocation range is used as an evaluation result for notification processing by the notification means.
(Appendix 8)
The evaluation means includes an adjustment amount integration unit that integrates an adjustment amount of transmission start timing by the timing adjustment unit, and uses the integration result as an evaluation result for notification processing by the notification unit. Mobile terminal equipment.
(Appendix 9)
A base station apparatus that exchanges radio signals with at least one mobile terminal apparatus located in a cell of a radio communication system to which a time division duplex method is applied,
A timing adjustment instructing unit for instructing each mobile terminal device to adjust transmission start timing so as to cancel a transmission delay of an uplink frame signal coming from each mobile terminal device;
In each mobile terminal apparatus, a temporal positional relationship between an uplink subframe whose transmission start timing is adjusted according to the instruction and a downlink subframe coming from the base station apparatus, and a reference in the base station apparatus An extraction means for extracting a notification including an evaluation result on a difference from a temporal positional relationship from a radio signal from each mobile terminal device;
Range specifying means for specifying a range that can be allocated to each mobile terminal apparatus for downlink subframes and uplink subframes based on the evaluation result about the difference notified from each mobile terminal apparatus And
The base station apparatus characterized in that a radio resource management unit provided in the base station apparatus allocates radio resources included in a range specified by the range specifying means to each mobile terminal apparatus.
(Appendix 10)
From the at least one mobile terminal device, as an evaluation result on the difference, an integration result of the adjustment amount of the transmission start timing is notified,
The range specifying means includes
Based on the integration result, an overlap determination unit that detects an overlap period in which uplink subframes and downlink subframes overlap each other in each mobile terminal device; and
(Supplementary note 9), further comprising: an allocation adjustment unit that determines a range that can be allocated to each mobile terminal apparatus for the uplink subframe and the downlink subframe based on the detected overlap period. The base station apparatus as described.
(Appendix 11)
A base station apparatus that exchanges radio signals with at least one mobile terminal apparatus located in a cell of a radio communication system to which a time division duplex method is applied,
A timing adjustment instructing unit for instructing each mobile terminal device to adjust transmission start timing so as to cancel a transmission delay of an uplink frame signal coming from each mobile terminal device;
Based on the instruction to each mobile terminal apparatus by the timing adjustment instruction unit, the temporal positional relationship between the uplink subframe and the downlink subframe in each mobile terminal apparatus and the reference in the base station apparatus An evaluation means for evaluating the difference from the temporal positional relationship;
Based on the evaluation results obtained for each of the mobile terminal devices, a range specifying means for specifying a range that can be allocated to each mobile terminal device for downlink subframes and uplink subframes,
The base station apparatus characterized in that a radio resource management unit provided in the base station apparatus allocates radio resources included in a range specified by the range specifying means to each mobile terminal apparatus.

DESCRIPTION OF SYMBOLS 100 Base station apparatus 101 Timing adjustment instruction | indication part 102 Extraction means 103 Area allocation means 104 Radio | wireless resource management part 111 Investigation means 112 Assignment control means 113 Detection means 114 Temporary allocation means 120 Mobile terminal apparatus 121 Timing adjustment part 122 Evaluation means 123 Notification means 211 , 231 Wireless transmission / reception unit 212, 232 Separation unit 213, 233 Decoding processing unit 214 Terminal control unit 215 Liquid crystal display unit 216 Speaker 217 Operation panel unit 218 Microphone 219, 235 Encoding processing unit 220, 237 Multiplexing unit 221, 236 Configuration information Holding unit 222 Adjustment amount integrating unit 223, 240 Overlap determining unit 224 Notification processing unit 234 Base station control unit 238 Notification extracting unit 239 Allocation adjusting unit 241 Correction value integrating unit 242 Integrated value holding unit 243 Integrated value analyzing unit 244 Temporary allocation instruction unit

Claims (5)

Uplink subframe in which transmission start timing is adjusted so as to cancel transmission delay with the base station apparatus for each mobile terminal apparatus located in a cell of a radio communication system to which time division duplex is applied Survey means for investigating the temporal positional relationship between the subframe and the downlink subframe,
The base station apparatus includes: an allocation control unit that controls a process of allocating regions in the downlink subframe and the uplink subframe to the individual mobile terminal apparatuses based on the investigation result. A wireless communication system. The wireless communication system according to claim 1, wherein
The investigation means comprises detection means for detecting an overlap period in which uplink subframes and downlink subframes overlap in time in each mobile terminal device,
The allocation control means performs control for allocating at least one of a downlink subframe area and an uplink subframe area while avoiding the overlap period to a mobile terminal apparatus in which the overlap period is detected. A wireless communication system. The wireless communication system according to claim 1, wherein
Provisional allocating means for tentatively allocating a region belonging to the first half of the uplink subframe and a region belonging to the second half of the downlink subframe to the mobile terminal device whose transmission delay is unknown via the base station device; A wireless communication system. A mobile terminal device located in a cell of a wireless communication system to which a time division duplex method is applied,
A timing adjustment unit that adjusts the transmission start timing of the uplink subframe so as to cancel the transmission delay with the base station device;
Evaluation means for evaluating a difference between a temporal positional relationship between the adjusted uplink subframe and a downlink subframe coming from the base station device, and a temporal positional relationship serving as a reference in the base station device When,
A notification means for notifying the evaluation result by the evaluation means to the base station apparatus using a radio signal and for allocating areas in the downlink subframe and the uplink subframe by the base station apparatus; A mobile terminal device. A base station apparatus that exchanges radio signals with at least one mobile terminal apparatus located in a cell of a radio communication system to which a time division duplex method is applied,
A timing adjustment instructing unit for instructing each mobile terminal device to adjust transmission start timing so as to cancel a transmission delay of an uplink frame signal coming from each mobile terminal device;
In each mobile terminal apparatus, a temporal positional relationship between an uplink subframe whose transmission start timing is adjusted according to the instruction and a downlink subframe coming from the base station apparatus, and a reference in the base station apparatus An extraction means for extracting a notification including an evaluation result on a difference from a temporal positional relationship from a radio signal from each mobile terminal device;
Range specifying means for specifying a range that can be allocated to each mobile terminal apparatus for downlink subframes and uplink subframes based on the evaluation result about the difference notified from each mobile terminal apparatus And
The base station apparatus characterized in that a radio resource management unit provided in the base station apparatus allocates radio resources included in a range specified by the range specifying means to each mobile terminal apparatus.

Images