JP4300931B2 - WIRELESS COMMUNICATION SYSTEM AND METHOD, BASE STATION, MOBILE STATION, DATA TRANSMITTING AND RECEIVING METHOD, AND DATA TRANSMITTING AND RECEIVING PROGRAM - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To attain low power consumption in each mobile station at the time of a comparatively low bit rate or the like, and accordingly, the low power consumption of a system as a whole. <P>SOLUTION: For each of mobile stations meeting specific conditions among mobile stations MT1-MT3, a base station performs communication slot assignment at a time interval of an N (N:integer of two or more) frame cycle. Thus, while these mobile stations are brought into non-power saving states in which various kinds of control signals can be received for each time interval of the N frame cycle and data can be transmitted and received, since they are in power saving states over a long period as the value of N is large, the low power consumption of the system as a whole can be attained. <P>COPYRIGHT: (C)2005,JPO&amp;NCIPI

Description

  The present invention relates to a wireless communication system in which data can be transmitted and received between a base station and each of one or more mobile stations in an assigned communication slot on a frame format, and in particular, to reduce power consumption. The present invention relates to a radio communication system and method in which data transmission / reception is performed while each mobile station satisfying a specific condition is in an intermittent operation state, and a base station, a mobile station, a data transmission / reception method, and a data transmission / reception program.

  In a time division wireless communication system having a frame structure such as a wireless LAN as a broadband wireless communication system, specifically, HIPERLAN / 2 (HIgh PErformans Radio LAN type 2) as a European wireless LAN standard, each frame is transmitted by a base station. Band allocation (communication slot allocation) is performed, and each terminal as a mobile station transmits and receives data according to the allocation. This band allocation information is transmitted as broadcast information on the FCH following the frame synchronization signal BCH at the head of the frame. Each terminal receives the information to know the number of communication slots assigned to the terminal for the first time and its time position, and data is transmitted to and received from the base station on these communication slots. .

  Here, more specifically, the HIPERLAN / 2 will be briefly described. FIG. 10 shows the frame structure. As shown in the figure, assuming that the frame period T is 2 ms, the frame format is BCH (Broadcast Channel: packet indicating the head of the frame), FCH (Frame Channel: resource allocation in the frame (what kind of transmission / reception is performed at what time)) ), ACH (Access feedback Channel: packet indicating reception confirmation for RCH of previous frame), downlink (DL) (Down Link), uplink (UL) (Up Link), and RCH (Random Channel: terminal) Is a packet for transmitting a control signal from the base station to the base station, and is used when any notification is made to the base station). Incidentally, the ratio of UL and DL is variable for each frame, and the number of symbols prepared in RCH (which constitutes a part of UL) is any one of 1-31, and the number of symbols is determined by BCH. (In this example, the number of symbols of the RCH is set to 4).

  As described above, the bandwidth allocation information in the frame is transmitted from the base station AP to each terminal MT by FCH. FIG. 11 shows an outline of the data transmission / reception operation from the base station AP to the terminal MT. 12 shows an outline of data transmission / reception operation from the terminal MT to the base station AP. As shown in the figure, in each terminal MT, when there is data addressed to the own terminal in the base station AP only when the bandwidth is allocated to the own terminal, the data is transmitted from the base station AP and then transmitted to the own terminal. If there is data addressed to the base station AP, the data is transmitted from the own terminal to the base station AP.

Incidentally, in Patent Document 1, normally, the wireless terminal is in a reception standby state by turning on the power supply only during the first frame receivable period, but the wireless terminal includes the incoming call display signal and the own terminal number. When the first frame is received, the system is shifted to a state of receiving a second frame including data addressed to the terminal for the first time.
JP-A-1-202948

  As can be seen from the data transmission / reception operation in HIPERLAN / 2, in addition to the data transmission / reception related to the own station, each terminal has broadcast information (21 symbols (including preamble)) located at the head of the frame. BCH, FCH and ACH) must also be received at all times. Therefore, when there are many transmission / reception data packets related to the terminal itself, the power consumption for receiving the broadcast information is relatively small, which is not a problem. However, in communication with a relatively low transmission rate, The overhead cannot be ignored.

  In addition, an application that transmits data only when there is a request, such as a Web browser, often receives broadcast information without actually transmitting or receiving data. Such a state is considered to be useless from the viewpoint of low power consumption. However, if the connection with the network is cut off, data transmission / reception becomes necessary again. A connection to the wireless network is required and it is necessary to resume from the association.

  The object of the present invention is to reduce the power consumption of each mobile station at a relatively low bit rate or when an application with intermittent data transmission is being executed. To provide a wireless communication system and a wireless communication method, a base station and a mobile station constituting the wireless communication system, and a data transmission / reception method and a data transmission / reception program in the base station and mobile station It is in.

In the wireless communication system of the present invention, data can be transmitted and received between the base station and each of the one or more mobile stations in the assigned communication slot on the frame format. On the other hand, by assigning communication slots from the base station at time intervals of N (N: integer greater than or equal to 2) frame periods, the mobile stations can perform various operations at time intervals of N frame periods. In a non-power saving state in which control signals can be received and data can be transmitted / received, data transmission / reception is performed with the base station in the assigned communication slot. Further, in the base station, when the number of transmission / reception symbols in one or more mobile stations is compared with the parameter for performing intermittent transmission / reception operation, when the number of transmission / reception symbols is larger than the parameter, intermittent transmission / reception is not performed in the mobile station. When the number of transmission / reception symbols is equal to or less than the parameter, the mobile station is controlled to perform intermittent transmission / reception in the power saving state for (N-1) frame periods. The value N is a time determined by obtaining a multiplication value obtained by multiplying an interval of one frame by a value selected based on the assumed maximum value of retransmission, and dividing the required maximum transmission delay time by the multiplication value. Is the value N of the frame period corresponding to.

  That is, each mobile station satisfying a specific condition is in a non-power-saving state (active state) in which various control signals can be received and data can be transmitted and received at intervals of N frames so that each mobile station can be in an intermittent operation state. Smelled. At this time, as the value of N increases, the mobile station is placed in a power saving state in which various control signals and data cannot be received. As a result, the power consumption of the mobile station can be reduced. Is. Therefore, when more mobile stations are placed in the intermittent operation state, the power consumption of the entire wireless communication system is reduced accordingly.

  At a relatively low bit rate or when an application with intermittent data transmission is executed, the power consumption of each mobile station can be reduced, and thus the power consumption of the entire system can be reduced.

The best mode for carrying out the present invention will be described below with reference to FIGS.
First, the outline of the present invention will be described. FIG. 1 shows an outline of an example of a radio communication system according to the present invention. As shown in the figure, the radio communication system is composed of a base station AP and three mobile stations MT1 to MT3, and further, allocation communication on the frame format between the base station AP and each of the mobile stations MT1 to MT3. Although data can be transmitted and received in the slot, among these mobile stations MT1 to MT3, the mobile station MP satisfying a specific condition is set in an intermittent operation state.

  Here, for example, assuming that a communication slot is assigned to the mobile station MT at a time interval of two frame periods from the base station AP, an outline of data transmission / reception operation from the base station AP to the mobile station MT FIG. 2 shows an outline of the data transmission / reception operation from the mobile station MT to the base station AP. As shown in the figure, the mobile station MT is placed in a non-power saving state (active state) every two frame periods, and from the base station AP within the DL period by the assigned communication slot notified from the base station AP. Data can be received, and data can be transmitted to the base station AP within the UL period. After the data transmission / reception is completed, the state is quickly shifted to the power saving state.

  By the way, in order to enable the intermittent operation of the mobile station MT as described above, the mobile station MT itself is provided in the base station AP on the premise that the mobile station MT is autonomously placed in a non-power-saving state every two frame periods. The allocated communication slot notifying means 11 notifies the allocated communication slot from the base station AP every two frame periods by FCH. If BCH, FCH, or the like is received in a certain frame while the mobile station MT is in the non-power saving state, the data transmission / reception means 12 provided in the base station AP uses the assigned communication slot included in the FCH. Data can be transmitted / received to / from the base station AP. When transmission / reception of this data is completed, the mobile station MT is automatically shifted to the power saving state once. However, the mobile station MT automatically returns from the power saving state to the non-power saving state immediately before the end of the next frame. Intermittent operation with a two-frame period is possible. In general, when the mobile station MT itself is autonomously placed in a non-power-saving state every N (N: integer greater than or equal to 2) frame periods, intermittent operation can be performed in N frame periods.

  FIG. 4 shows a radio communication method between the mobile station MT and the base station AP when the mobile station MT itself is intermittently operated, that is, autonomously placed in a non-power-saving state every N frame periods. In this case, communication slot allocation / notification is performed from the base station AP to the intermittently operating mobile station in the non-power saving state (process 41). Based on this notification, the intermittent operation mobile station transmits / receives data to / from the base station AP in the assigned communication slot (process 42). After that, the intermittent operation mobile station is placed in a power saving state for approximately (N-1) frame periods and then in an automatic return state. In this state, the base station AP sends an intermittent operation to the intermittent operation mobile station. Thus, communication slot allocation / notification is performed (processes 43 and 41).

Here, the necessity and usefulness of intermittent operation of the mobile station will be described although being delayed. The relationship between the amount of data transmitted and received and the number of symbols is expressed as HIPERLAN / 2 · 16QAM (Quadrature Ampltude Modulation). Taking a case where transmission is performed at a coding rate R = 3/4 as an example, a specific calculation is as follows.
1) 100kbps 200bit / frame 0.5LCH 1.5symbol
2) 1Mbps 2kbit / frame 5LCH 15symbol
3) 10Mbps 20kbit / frame 50LCH 150symbol
Incidentally, LCH (Long CHannel) is a unit when data is transmitted, and 1LCH corresponds to 432 bits.

  As described above, the broadcast information is for 21 symbols, but if this is received every frame, the ratio of the effective data in the total received data is 100 kbps: 6.6 (= {1.5 / (21 + 1) .5)} × 100)%, 1 Mbps: 42%, 10 Mbps: 88%, and it can be seen that transmission is very inefficient when the transmission speed is 1 Mbps or 100 kbps. Therefore, in the present invention, by assigning communication slots to mobile stations in units of a plurality of frames, when the bit rate is relatively low as in the above 1) and 2), once every several frames. Communication slot allocation is performed at the rate of.

Specifically, the following method is adopted.
That is, it can be considered that the intermittent operation mode for each mobile station is changed as needed based on the judgment of the base station. In the notification of the assigned communication slot from the base station to each mobile station, not only the communication slot assignment information in the frame, but also the frame information scheduled to be notified next time is transmitted using the FCH. It is intended to be notified. This means that the communication slot is not always notified to the mobile station at regular intervals, and therefore data transmission / reception is not necessarily performed at regular intervals between the mobile station and the base station. . At this time, as the notified frame information, the frame number included in the above-described BCH may be directly used, but relative to the current frame number, for example, after 10 frames, etc. May be specified.

  Further, when the base station performs communication slot allocation to the mobile station, the communication slot allocation interval is optimally determined so that the ratio of effective data in all transmitted / received data including broadcast information satisfies a predetermined condition. .

  Furthermore, the mobile station cannot receive broadcast information from the base station after the transmission / reception of data in the current frame until the transmission / reception of data in a certain frame thereafter starts. In the power save state where data transmission / reception is not possible, the frame number is updated autonomously inside, but if this power save state is very long, Larger time lags occur between the update and that at the base station. In other words, the automatic return from the power save state is not performed with good timing, and even if data transmission / reception is performed in a certain frame, there is a possibility that data transmission / reception in that frame may become impossible. In order to avoid such a problem, it is conceivable that the mobile station is automatically returned from the power saving state several times during the period. If at least BCH is received at every automatic return, the frame number update state is easily corrected based on the reception timing and the frame number included in the reception timing. As a result, an accurate automatic return timing is obtained. Will be obtained. Incidentally, although it is about the automatic return timing from the power saving state in the period, the timing may be designated from the base station, but may be generated autonomously on the mobile station side.

  Furthermore, when there is a large amount of transmission data or when the demand for transmission delay of an application is severe, communication slot allocation is performed every frame as in the conventional case. However, when the amount of transmission data is small, communication slots are assigned to some of the plurality of frames. At this time, the request for transmission delay required on the mobile station side is considered. In addition, the allocated frame period and the amount of transmission data per time are determined by the base station.

  For example, in the example of 100 kbps described above, if data transmission of one frame is performed in 50 frames and broadcast information is received twice during this period, the ratio of transmission data in the total received data is 78%. Thus, the invalid power consumption is greatly reduced. However, on the other hand, the transmission delay is at least 100 ms, and if retransmission due to a transmission error is required, the transmission delay is 200 ms. In a music stream or the like, if a large buffer memory capacity is secured, such a transmission delay is not a big problem. On the other hand, in applications such as VoIP, if there is a large transmission delay, natural conversation cannot be performed. If the transmission delay assigned to the radio section is 50 ms, one frame of data transmission is required in 12 frames, and the ratio of the transmission data in the total received data is 46%.

  Here, it is assumed that the maximum allowable frame interval for intermittent data transmission / reception is N, the required transmission delay is Td (ms), and the interval of one frame, that is, the frame period is T (ms). The value of N is obtained as follows in consideration of the case where is performed. However, α in the equation is a value of 1 or more and 4 or less, and is selected according to the assumed maximum value of retransmission. In the following description, it is assumed that the value of α is 2.

(Equation 1)
N = floor {Td / (αT)}
However, floor indicates a truncation symbol after the decimal point.

  From the above formula, in general, the frame interval for intermittent data transmission / reception may be set to be 2 or more and N or less, semi-fixed, or variable as needed. FIG. 5 shows a flow of an example of an operation frame interval determination process for the mobile station. However, it should be noted that N appearing in this flow does not necessarily match that obtained by the above formula. As shown in FIG. 5, first, an intermittent operation parameter SO and a maximum pause interval NO are set (process 501). Since the broadcast information alone is received for 21 symbols, if the number of data reception symbols per frame is about 100 symbols, the intermittent operation parameter SO is set to SO if it is determined that the intermittent operation is not sufficient. = 100 may be set. Thereafter, the mobile station takes in the transmission delay Td corresponding to the type of application, and calculates the number S of transmitted / received symbols per frame (processing 502 and 503). The number S of transmitted / received symbols is calculated according to the transmission band. For example, if 10 Mbps, S = 150 is set.

  Further, after that, it is determined whether or not the intermittent operation parameter S0 is larger than the number S of transmission / reception symbols. However, if S ≧ SO in this determination, the intermittent operation for the mobile station is unnecessary. If there is, the process is terminated (processes 504 and 510). However, if S <SO, the operation frame interval N is obtained as follows (processes 504 and 505).

(Equation 2)
N = floor (SO / S)

  Thereafter, it is determined whether or not the maximum pause interval NO is larger than the operation frame interval N (process 506). In this determination, if N <NO, the process proceeds to the next process. If N≥NO, N is newly set as N = NO and the process proceeds to the next process. (Processing 506, 508). In the next process, it is determined whether floor {Td / (2T)} is larger than the operation frame interval N obtained as described above (process 507). If it is not greater than the motion frame interval N, the frame motion interval N is determined as floor {Td / (2T)}, otherwise the frame motion interval N is smaller than floor {Td / (2T)}. It is calculated as a value (processes 507 and 509).

  The wireless communication system and the wireless communication method according to the present invention have been described above. In the notification of the allocated communication slot from the base station to the mobile station, the frame information scheduled to be notified next time is also notified. The configuration of each base station and mobile station, the data transmission / reception method of each, and the like will be described as follows.

  That is, FIG. 6 shows the configuration of an example of a base station. As shown in the figure, the base station 6 is assigned an assigned communication slot / next assignment for notifying the assigned communication slot and the next communication slot assignment scheduled frame information at a time interval defined by the next next communication slot assignment scheduled frame information. At least one movement in a non-power-saving state in which various control signals can be received and data can be transmitted / received at a time interval defined by the scheduled frame information notifying means 61 and the immediately preceding next communication slot allocation scheduled frame information Data transmitting / receiving means 62 for transmitting / receiving data to / from the station is provided. Specifically, from the allocated communication slot / next allocation scheduled frame information notification means 61, an allowable maximum data delay amount for each corresponding mobile station is Td, a frame period is T, and an integer less than an integer obtained as FloorTd / (2T). Assuming that an arbitrary integer of N is N (N: an integer equal to or greater than 2), notification of the allocated communication slot and the next scheduled communication slot allocation frame information is performed at intervals of N frame periods.

Further, FIG. 7 illustrates a flow of data transmission / reception processing in the base station 6 or an example of data transmission / reception processing program executed in the base station 6. In this case, firstly, the allocated communication slot and the next communication slot allocation scheduled frame information are notified to the mobile station that has returned from the non-power-saving state at the time interval specified by the immediately preceding next communication slot allocation scheduled frame information. (Process 71).
Next, data is transmitted / received to / from the mobile station (process 72). After that, the mobile station is placed in the power saving state for the period based on the next communication slot allocation scheduled frame information, so that the mobile station waits for the period and then allocates communication to the mobile station. The slot and next communication slot allocation scheduled frame information are notified (process 73, 71). Specifically, in the processing 71, the maximum allowable data delay amount for each mobile station is Td, the frame period is T, and an arbitrary integer less than or equal to the integer obtained as FloorTd / (2T) is N (N: an integer of 2 or more) As described above, the allocation communication slot and the next communication slot allocation scheduled frame information are notified at time intervals of N frame periods.

  Next, FIG. 8 shows the configuration of an example of a mobile station. As shown in the figure, the mobile station 8 is allocated to the mobile station 8 in a non-power-saving state, the allocated communication slot / next allocation scheduled frame information receiving means 81 for receiving the allocated communication slot and the next communication slot allocation scheduled frame information, Data transmission / reception means 82 for transmitting / receiving data to / from the base station based on the communication slot, and itself being in a power saving state upon completion of data transmission / reception based on the received next communication slot allocation scheduled frame information And automatic return means 83 for automatically returning the power to the non-power saving state. Further, by the automatic return means 83, the mobile station 8 itself is automatically returned to the non-power saving state regardless of the next communication slot allocation scheduled frame information, and at least the synchronization signal and the frame number indicating the frame head The control signal including the signal can be received.

  Further, FIG. 9 illustrates a flow of data transmission / reception processing in the mobile station 8 as an example, or a processing flow in an example of a data transmission / reception processing program executed in the mobile station 8. In this case, first, in the non-power saving state, the allocated communication slot and the next communication slot allocation scheduled frame information are received (process 91). Next, data is transmitted to and received from the base station based on the received assigned communication slot (process 92). Thereafter, the mobile station 8 itself shifts to the power saving state and then waits for a period of time corresponding to the next communication slot allocation scheduled frame information (processing 93, 94). Eventually, after the period elapses, the system automatically returns from the power saving state, and the assigned communication slot and the next communication slot assignment scheduled frame information are received again (processes 95 and 91). The mobile station 8 itself is placed in the power saving state for a period corresponding to the next communication slot allocation scheduled frame information. Even within this period, the mobile station 8 is automatically returned to the non-power saving state and indicates the head of the frame. A control signal including a synchronization signal and a frame number can be received.

  As described above, wireless communication with a minimum necessary overhead is provided to a mobile station executing a relatively low transmission rate application. In addition, it is possible to continuously switch between the conventional method of allocating the transmission band for each frame and the method of allocating the transmission band for every several frames or tens of frames. As a result, the same application can be executed. However, the optimum operation is always provided from the viewpoint of power consumption with respect to the required temporal change of the transmission band.

It is a figure which shows the outline | summary in an example of the radio | wireless communications system by this invention. It is a figure which shows the outline | summary of the data transmission / reception operation | movement from a base station to a mobile station in the radio | wireless communications system. Similarly, it is a figure which shows the outline | summary of the data transmission / reception operation | movement from a mobile station to a base station in the radio | wireless communications system. It is a figure which shows the radio | wireless communication method between the intermittent operation | movement mobile station and base station in the radio | wireless communications system. It is a figure which shows the flow in an example of the operation | movement frame space | interval determination process with respect to a mobile station. It is a figure which shows the structure in an example of the base station by this invention. It is a figure which shows the flow of the data transmission / reception process in an example in the base station. It is a figure which shows the structure in an example of the mobile station by this invention. It is a figure which shows the flow of the data transmission / reception process in an example in the mobile station. It is a figure which shows the frame structure in HIPERLAN / 2. It is a figure which shows the outline | summary of the data transmission / reception operation | movement from a base station to a terminal in HIPERLAN / 2. It is a figure which shows the outline | summary of the data transmission / reception operation | movement from a terminal to a base station in HIPERLAN / 2.

Explanation of symbols

  AP, 6 ... base station, MT1 to MT3, 8 ... mobile station, 61 ... allocation communication slot / next allocation scheduled frame information notification means, 62, 82 ... data transmission / reception means, 81 ... allocation communication slot / next allocation schedule frame information reception Means, 83 ... automatic return means

Claims (18)

A wireless communication system in which data can be transmitted / received between a base station and each of one or more mobile stations in an assigned communication slot on a frame format,
Communication slot assignment is performed for each mobile station satisfying a specific condition among one or more mobile stations with a time interval of N (N: an integer of 2 or more) frame period by a control signal on the frame format. A base station,
Various control signals can be received at intervals of N frame periods, data can be transmitted / received in a non-power-saving state, and in a power saving state for (N-1) consecutive frame periods. Including mobile stations ,
The specific condition is a case where the number of transmission / reception symbols in the mobile station is compared with a parameter for performing intermittent transmission / reception operation, and the number of transmission / reception symbols is equal to or smaller than the above parameter. When the parameter is larger than the above parameter, the mobile station is controlled not to perform intermittent transmission / reception. When the number of transmission / reception symbols is equal to or smaller than the parameter, the mobile station is controlled for the (N-1) frame period. Control to perform intermittent transmission to power saving state,
The value N is obtained by multiplying an interval of one frame by a value selected based on the assumed maximum value of retransmission and dividing the required maximum transmission delay time by the multiplied value. A wireless communication system having a frame period value N corresponding to time . The wireless communication system according to claim 1, wherein
A wireless communication system in which a mobile station in a power saving state is automatically returned to a non-power saving state based on frame information to be assigned to a next communication slot included in the control signal. The wireless communication system according to claim 2, wherein
Regardless of the frame information scheduled to be assigned to the next communication slot, each mobile station in the power saving state is automatically returned to the non-power saving state, and the synchronization signal and frame number indicating the frame head are set. A wireless communication system in which a control signal including it can be received. A wireless communication method in a wireless communication system in which data can be transmitted and received between a base station and each of one or more mobile stations in an assigned communication slot on a frame format,
Based on the control signal on the frame format, communication slot allocation is performed at intervals of N (N: integer of 2 or more) frame periods for each mobile station satisfying a specific condition among one or more mobile stations. A communication slot assignment step performed by the station;
Various control signals can be received at intervals of N frame periods, data can be transmitted / received in a non-power-saving state, and in a power saving state for (N-1) consecutive frame periods. A data transmission / reception step for transmitting / receiving data between each mobile station and the base station ,
The specific condition is a case where the number of transmission / reception symbols in the mobile station is compared with a parameter for performing intermittent transmission / reception operation, and the number of transmission / reception symbols is equal to or smaller than the above parameter. When the parameter is larger than the above parameter, the mobile station is controlled not to perform intermittent transmission / reception. When the number of transmission / reception symbols is equal to or smaller than the parameter, the mobile station is controlled for the (N-1) frame period. Control to perform intermittent transmission to power saving state,
The value N is obtained by multiplying an interval of one frame by a value selected based on the assumed maximum value of retransmission and dividing the required maximum transmission delay time by the multiplied value. A wireless communication method having a frame period value N corresponding to time . The wireless communication method according to claim 4 , wherein
A wireless communication method in which a mobile station in a power saving state is automatically returned to a non-power saving state based on frame information to be assigned to a next communication slot included in the control signal. The wireless communication method according to claim 5 , wherein
Regardless of the frame information scheduled to be assigned to the next communication slot, each mobile station in the power saving state is automatically returned to the non-power saving state, and the synchronization signal and frame number indicating the frame head are set. A wireless communication method in which a control signal including the signal can be received. A base station in which data can be transmitted / received to / from one or more mobile stations that together constitute a wireless communication system in an assigned communication slot on a frame format,
Assigned communication slot / next assignment for notifying the assigned communication slot and the next scheduled communication slot allocation frame information for each mobile station that meets a specific condition at a time interval specified by the next scheduled next communication slot allocation scheduled frame information Scheduled frame information notification means;
Data transmission / reception means for transmitting / receiving data to / from each mobile station in a non-power-saving state capable of receiving various control signals and transmitting / receiving data at a time interval defined by the next and next communication slot allocation scheduled frame information Including
The specific condition is a case where the number of transmission / reception symbols in the mobile station is compared with a parameter for performing intermittent transmission / reception operation, and the number of transmission / reception symbols is equal to or smaller than the above parameter. When the parameter is larger than the above parameter, the mobile station is controlled so as not to perform intermittent transmission / reception. When the number of transmission / reception symbols is equal to or smaller than the parameter, the mobile station is kept in a continuous (N-1) frame period. (N: an integer greater than or equal to 2)
The value N is obtained by multiplying an interval of one frame by a value selected based on the assumed maximum value of retransmission and dividing the required maximum transmission delay time by the multiplied value. A base station having a frame period value N corresponding to time . The base station according to claim 7 ,
From the above-mentioned allocated communication slot / next allocation scheduled frame information notifying means, the allowable maximum data delay amount for each corresponding mobile station is Td and the frame period is T. Floor (Floor: symbol indicating truncation after the decimal point) Td / ( αT), where α is an integer less than or equal to an integer obtained as N (N: an integer greater than or equal to 2), and assigned communication slots at intervals of N frame periods. The base station to which the next communication slot allocation scheduled frame information is notified. A data transmission / reception method in a base station, in which data can be transmitted / received in / from an assigned communication slot on a frame format with each of one or more mobile stations that together constitute a wireless communication system,
Assigned communication slot / next assignment for notifying the assigned communication slot and the next scheduled communication slot allocation frame information for each mobile station that meets a specific condition at a time interval specified by the next scheduled next communication slot allocation scheduled frame information Scheduled frame information notification step;
A data transmission / reception step for transmitting / receiving data to / from each mobile station in a non-power-saving state capable of receiving various control signals and transmitting / receiving data at time intervals specified by the immediately preceding / next communication slot allocation scheduled frame information Including
The specific condition is a case where the number of transmission / reception symbols in the mobile station is compared with a parameter for performing intermittent transmission / reception operation, and the number of transmission / reception symbols is equal to or smaller than the above parameter. When the parameter is larger than the above parameter, the mobile station is controlled so as not to perform intermittent transmission / reception. When the number of transmission / reception symbols is equal to or smaller than the parameter, the mobile station is kept in a continuous (N-1) frame period. (N: an integer greater than or equal to 2)
The value N is obtained by multiplying an interval of one frame by a value selected based on the assumed maximum value of retransmission and dividing the required maximum transmission delay time by the multiplied value. A data transmission / reception method having a frame period value N corresponding to time . The data transmission / reception method according to claim 9 ,
From the allocation communication slot / next allocation scheduled frame information notifying step, Td / (Floor: symbol indicating truncation after the decimal point) Td / ( αT), where α is an integer less than or equal to an integer obtained as N (N: an integer greater than or equal to 2), and assigned communication slots at intervals of N frame periods. A data transmission / reception method in which the next communication slot allocation scheduled frame information is notified. A data transmission / reception program that is executed by a base station that is capable of transmitting / receiving data to / from one or more mobile stations that together constitute a wireless communication system in an assigned communication slot on a frame format,
Assigned communication slot / next assignment for notifying the assigned communication slot and the next scheduled communication slot allocation frame information for each mobile station that meets a specific condition at a time interval specified by the next scheduled next communication slot allocation scheduled frame information Scheduled frame information notification step;
A data transmission / reception step for transmitting / receiving data to / from each mobile station in a non-power-saving state capable of receiving various control signals and transmitting / receiving data at time intervals specified by the immediately preceding / next communication slot allocation scheduled frame information Including
The specific condition is a case where the number of transmission / reception symbols in the mobile station is compared with a parameter for performing intermittent transmission / reception operation, and the number of transmission / reception symbols is equal to or smaller than the above parameter. When the parameter is larger than the above parameter, the mobile station is controlled so as not to perform intermittent transmission / reception. When the number of transmission / reception symbols is equal to or smaller than the parameter, the mobile station is kept in a continuous (N-1) frame period. (N: an integer greater than or equal to 2)
The value N is obtained by multiplying an interval of one frame by a value selected based on the assumed maximum value of retransmission and dividing the required maximum transmission delay time by the multiplied value. A data transmission / reception program having a frame period value N corresponding to time . The data transmission / reception program according to claim 11 ,
From the allocation communication slot / next allocation scheduled frame information notifying step, Td / (Floor: symbol indicating truncation after the decimal point) Td / ( αT), where α is an integer less than or equal to an integer obtained as N (N: an integer greater than or equal to 2), and assigned communication slots at intervals of N frame periods. Data transmission / reception program that notifies the next communication slot allocation scheduled frame information. A mobile station in which data can be transmitted and received in an assigned communication slot on a frame format with a base station that together constitute a wireless communication system, and which meets a specific condition,
Assigned communication slot and next assigned scheduled frame information receiving means for receiving the assigned communication slot and the next scheduled communication slot assigned frame information in a non-power saving state,
Data transmission / reception means for transmitting / receiving data to / from the base station based on the assigned communication slot received by the assigned communication slot / next allocation scheduled frame information receiving means;
Based on the next communication slot allocation scheduled frame information received by the above-mentioned allocated communication slot / next allocation scheduled frame information receiving means, the power saving state is automatically restored to the non-power saving state upon completion of data transmission / reception. With automatic return means ,
The specific condition is a case where the number of transmission / reception symbols in the mobile station is compared with a parameter for performing intermittent transmission / reception operation, and the number of transmission / reception symbols is equal to or smaller than the above parameter. When the parameter is larger than the above parameter, the mobile station is controlled so as not to perform intermittent transmission / reception. When the number of transmission / reception symbols is equal to or smaller than the parameter, the mobile station has a continuous (N-1) frame period. (N: integer greater than or equal to 2), controlled to perform intermittent transmission / reception to enter the power saving state,
The value N is obtained by multiplying an interval of one frame by a value selected based on the assumed maximum value of retransmission and dividing the required maximum transmission delay time by the multiplied value. A mobile station having a frame period value N corresponding to time . The mobile station according to claim 13 ,
A state in which the control signal including the synchronization signal and the frame number indicating the beginning of the frame can be received after the automatic return means automatically returns itself to the non-power saving state regardless of the next communication slot allocation scheduled frame information. Mobile station Together with the base station that constitutes a wireless communication system, data is allocated communication slots on the frame format is capable transceiver, a method of transmitting and receiving data in and mobile station corresponding to the specific conditions,
In the non-power-saving state, the allocated communication slot and next allocation scheduled frame information receiving step for receiving the allocated communication slot and the next communication slot allocation scheduled frame information;
A data transmission / reception step for transmitting / receiving data to / from a base station based on the allocation communication slot received in the allocation communication slot / next allocation scheduled frame information reception step;
Based on the next communication slot allocation scheduled frame information received in the above-mentioned allocated communication slot / next allocation scheduled frame information reception step, the power saving state is automatically restored to the non-power saving state upon completion of data transmission / reception. An automatic return step;
The specific condition is a case where the number of transmission / reception symbols in the mobile station is compared with a parameter for performing intermittent transmission / reception operation, and the number of transmission / reception symbols is equal to or smaller than the above parameter. When the parameter is larger than the above parameter, the mobile station is controlled so as not to perform intermittent transmission / reception. When the number of transmission / reception symbols is equal to or smaller than the parameter, the mobile station has a continuous (N-1) frame period. (N: integer greater than or equal to 2), controlled to perform intermittent transmission / reception to enter the power saving state,
The value N is obtained by multiplying an interval of one frame by a value selected based on the assumed maximum value of retransmission and dividing the required maximum transmission delay time by the multiplied value. A data transmission / reception method having a frame period value N corresponding to time . The data transmission / reception method according to claim 15 ,
A state in which the control signal including the synchronization signal and the frame number indicating the head of the frame can be received after the automatic return step, automatically returning itself to the non-power saving state, regardless of the next communication slot allocation scheduled frame information. Data transmission / reception method. A data transmission / reception program that allows data to be transmitted / received to / from base stations that together constitute a wireless communication system in an assigned communication slot on a frame format and that is executed by a mobile station that satisfies a specific condition. ,
In the non-power-saving state, the allocated communication slot and next allocation scheduled frame information receiving step for receiving the allocated communication slot and the next communication slot allocation scheduled frame information;
A data transmission / reception step for transmitting / receiving data to / from a base station based on the allocation communication slot received in the allocation communication slot / next allocation scheduled frame information reception step;
Based on the next communication slot allocation scheduled frame information received in the above-mentioned allocated communication slot / next allocation scheduled frame information reception step, the power saving state is automatically restored to the non-power saving state upon completion of data transmission / reception. With automatic recovery step
The specific condition is a case where the number of transmission / reception symbols in the mobile station is compared with a parameter for performing intermittent transmission / reception operation, and the number of transmission / reception symbols is equal to or smaller than the above parameter. When the parameter is larger than the above parameter, the mobile station is controlled so as not to perform intermittent transmission / reception. When the number of transmission / reception symbols is equal to or smaller than the parameter, the mobile station has a continuous (N-1) frame period. (N: integer greater than or equal to 2), controlled to perform intermittent transmission / reception to enter the power saving state,
The value N is obtained by multiplying an interval of one frame by a value selected based on the assumed maximum value of retransmission and dividing the required maximum transmission delay time by the multiplied value. A data transmission / reception program having a frame period value N corresponding to time . The data transmission / reception program according to claim 17 ,
A state in which the control signal including the synchronization signal and the frame number indicating the head of the frame can be received after the automatic return step, automatically returning itself to the non-power saving state, regardless of the next communication slot allocation scheduled frame information. A data transmission / reception program.

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