JP5018229B2 - Base station, mobile station, radio communication system, and control method - Google Patents

Description

  The present invention relates to a base station, a mobile station, a radio communication system, and a control method, and more particularly to a base station, a mobile station, a radio communication system, and a control method for notifying individual call information and group call information using a downlink control channel. Is.

  In the wireless communication system according to FIG. 4A of Patent Document 1, a mobile station number (ID) is assigned to each mobile station, and a plurality of call channels are arranged in the superframe in the order of their group numbers. When a station notifies each mobile station of the call information, the call information is notified using a call channel having a group number corresponding to the mobile station number.

  The call information by the downlink control channel in the wireless communication system includes individual call information for individual communication for performing a 1: 1 call between mobile stations and group communication for performing a plurality of calls between mobile stations. There is call information by group. Since the group numbers corresponding to the numbers of the mobile stations belonging to each group vary, if the group-specific call information is notified using the method shown in FIG. 4 of Patent Document 1, call channels having a large number of group numbers must be used. Thus, the notification becomes inefficient (paragraph 0006 of Patent Document 1).

  Therefore, in FIG. 3A of Patent Document 1, a call for allocating group-specific call information separately from a call channel for allocating individual call information (# 1PCH, # 2PCH,... In FIG. 3A). The channel (GPCH in FIG. 3A) is set to a superframe, and the group-specific call information is notified to all the mobile stations belonging to the predetermined group using the group-specific call channel. It has become.

FIG. 3B of Patent Document 1 shows that each mobile station is in a reception ON state only during a period of a broadcast channel, a call channel for individual call information notification, and a call channel for group-specific call information notification. It is disclosed that the receiving station is in a reception OFF state during other periods to save power of the mobile station.
Japanese Patent No. 2878237

  The problems of the wireless communication system of Patent Document 1 are as follows.

(A) Since a call channel dedicated to notification of call information for each group is prepared, the total number of call channels in the superframe increases. In order to avoid this, it is sufficient to reduce the group number by one. However, if this is done, the number of mobile stations assigned to each group number increases, which adversely affects notification efficiency, power saving, and the like.

(B) Since there is only one call channel for allocating call information for each group in a superframe, a delay of one superframe cycle occurs at the maximum in the notification of call information for each group, and the delay increases. In addition, when group-specific call information to a plurality of groups occurs almost simultaneously, one of them is postponed to the next superframe, and the notification of the group-specific call information postponed is greatly delayed. In order to avoid this, if the number of paging channels for a group included in one superframe is increased, the problem arises that the total number of paging channels in the superframe increases, as in (a) above.

  As a countermeasure against this, the present inventor has abolished the call channel dedicated to group-specific call information allocation in the prior application (Japanese Patent Application No. 2007-38040), and changed the group number call channel to individual call information and group-specific call information. Disclosure of sharing. That is, the individual call information is assigned to the call channel having the group number corresponding to the ID (identifier) of the destination mobile station and sent, and the call information for each group is also assigned to the ID of the group of the destination. It is assigned to the calling channel of the corresponding group number and sent. This makes it possible to speed up the transmission of the group-specific call information as compared with the case where only one dedicated call channel for the group-specific call information is set in the superframe. Each mobile station receives a reception period limited to a period of a call channel having a group number corresponding to its own ID and a call channel having a group number corresponding to the ID of the group to which the own station belongs. In the other paging channel period, power saving can be achieved by suspending the reception operation.

  The number of groups to which one mobile station belongs is not limited to one. One mobile station may belong to a plurality of groups. Further, in a radio communication system with a large total number of mobile stations, the total number of groups also increases, and accordingly, the transmission of group-specific call information also increases. In such a case, in the wireless communication system of the prior application, the number of groups associated with the same group number increases, or individual call information and group-specific call information associated with the same group number are almost simultaneously. For example, the notification of the call information for each group is delayed.

  An object of the present invention is to provide a base station, a mobile station, a wireless communication system, and a control method capable of achieving smooth and quick transmission and reception of group-specific call information in a manner different from the prior application.

  According to the present invention, the call channel dedicated to allocating call information for each group is abolished, and the call channel for the group number is shared for notification of individual call information and call information for each group. Further, according to the present invention, the individual call information addressed to each mobile station is assigned to the call channel having the group number associated with the ID (identifier) of the mobile station, but the call information for each group addressed to each group. Makes the group number to which it is assigned undefined. That is, the call information for each group is transmitted by the call channel of any group number regardless of the ID of the group.

The base station of the present invention includes the following.
First call channel assignment means for assigning individual call information for each mobile station to a call channel having a group number corresponding to the identifier of the mobile station;
Group-specific call information for each group of mobile stations, each group-specific call information is assigned to a separate call channel , and each mobile station is grouped to a group to which the own station belongs from all the call channels. A second call channel allocating means for allocating the call information of the group number so that the call information can be extracted , and a call channel sequence arranged in a predetermined order for the call channel of each group number by the downlink control channel Downlink control channel transmission means for wireless transmission.

The mobile station of the present invention includes the following.
A downlink control channel receiving means for receiving, by a wireless downlink control channel, a calling channel sequence arranged in a predetermined order for each group number calling channel;
Individual call information extraction means for extracting individual call information addressed to the own station from the call channel of the group number assigned for notification of individual call information to the own station in the downlink control channel, and all call channels in the downlink control channel Group-specific call information extracting means for extracting group-specific call information addressed to the group to which the own station belongs.

  The wireless communication system of the present invention includes the base station and the mobile station. The wireless communication system is equipped with one or more base stations, and the wireless communication system is equipped with a plurality of mobile stations.

The base station control method of the present invention comprises the following steps.
Assigning individual call information for each mobile station to a call channel having a group number corresponding to the identifier of the mobile station;
Group-specific call information for each group of mobile stations, each group-specific call information is assigned to a separate call channel , and each mobile station is grouped to a group to which the own station belongs from all the call channels. A step of assigning call information to a call channel having a group number such that the call information can be extracted ; and a step of wirelessly transmitting a call channel sequence arranged in a predetermined order for the call channel having each group number using a downlink control channel.

The mobile station control method of the present invention comprises the following steps.
Receiving a paging channel sequence arranged in a predetermined order for paging channels of each group number by a radio downlink control channel;
A step of extracting the individual call information addressed to the own station from the call channel of the group number assigned for notification of the individual call information to the own station in the downlink control channel, and the own station from all the call channels in the downlink control channel Extracting group-specific call information addressed to the group to which the group belongs.

  According to the present invention, the individual call information and the group-specific call information can be avoided while avoiding an increase in the number of call channels in the downlink control channel by sharing the group-number call channel for the individual call information and the group-specific call information. Can be notified. Further, even when call information to a plurality of groups occurs simultaneously, the postponement time of the group-specific call information that is postponed by the notification can be shortened.

  According to the present invention, the call information for each group can be transmitted by appropriately using a call channel having an arbitrary group number by making the group number of the call channel to which the group call information is assigned undefined. The transmission time of the call information for each group can be greatly advanced.

  FIG. 1 is a schematic diagram of a wireless communication system 10. The wireless communication system 10 in FIG. 1 includes one base station 11 and a plurality of mobile stations 12. The mobile station 12 is an in-vehicle terminal or a portable terminal, for example. Communication from the base station 11 to the mobile station 12 is referred to as downlink communication, and communication from the mobile station 12 to the base station 11 is referred to as uplink communication. The communication system of the wireless communication system 10 may be TDMA (Time Division Multiple Access) or FDMA (Frequency Division Multiple Access).

  Each mobile station 12 in the wireless communication system 10 is given a mobile station ID (ID = identifier) and a group ID. These IDs are unique among mobile station IDs and group IDs. The number of groups to which one mobile station 12 belongs is not limited to one. When one mobile station 12 belongs to a plurality of groups, the mobile station 12 has a plurality of group IDs.

  In the example of FIG. 1, the UID (mobile station ID) of each mobile station 12 is 3, 5, 8, 10, 20, 30. Further, the GID (group ID) is = 1 for the group of mobile stations 12 with UID = 10, 20, 30, and = 3 for the group of mobile stations 12 with UID = 3, 5, 8. .

  In the communication state of FIG. 1, the mobile station 12 with UID = 10 performs group communication with the mobile stations 12 with UID = 20 and 30 belonging to the group with GID = 1. In addition, the mobile station 12 with UID = 8 performs individual communication with the mobile station 12 with UID = 5.

  The wireless communication system 10 may include a plurality of base stations. In a radio communication system equipped with a plurality of base stations, the base stations are arranged in an appropriate distribution. Typically, the mobile station 12 has a communicable distance with any of the base stations 11 while moving in the business area. Each base station 11 is connected by a cable or wirelessly to be networked. Therefore, a plurality of mobile stations 12 in the radio wave reach of different base stations 11 can perform individual communication or group communication.

  FIG. 2 shows various number information stored in the memory of the mobile station 12 with UID = 10. Each mobile station 12 has (a) its own UID (My UID), (b) a table of all UIDs of the other party in individual communication, and (c) all GIDs of the other party group in group communication. The table is held in memory.

  When the user of the mobile station 12 having UID = 10 starts 1: 1 individual communication, a user selects one UID from the UID table in the memory as a partner device, and then presses a PTT (Press to Talk) key. Press. In addition, when the user starts a plurality of group communications, the user selects one group from the GID table in the memory and then presses PTT.

  As for transmission from the mobile station 12, the user may designate a channel number and then press the PTT to make a call to a predetermined UID or GID, as will be described later with reference to FIG. It can be done.

  FIG. 3 shows an example of incoming and outgoing ID numbers associated with each channel number in the mobile station 12. In the mobile station 12, when the user selects any one of channels 1 to 3 (CH-1 to CH-3), group incoming and group transmission are selected. In addition, when the user selects 4 or 5 channels (CH-4, CH-5), the individual incoming call and individual transmission are selected.

  For example, when the user selects one channel (CH-1) in the mobile station 12, the mobile station 12 responds to the group-specific call information of GID = 1 from the other mobile station 12 with respect to the local station group. Performs processing related to incoming call information for each group. Further, when the user presses the PTT key, call information for each group to the group with GID = 1 is transmitted to the base station 11 through the uplink control channel. Similarly, when 2-channel (CH-2) or 3-channel (CH-3) is selected, incoming call information for each group addressed to the local station group is received for call information for each group with GID = 12,20. When the PTT key is pressed, the group-specific call information for the group with GID = 12, 20 is transmitted to the base station 11 through the uplink control channel.

  When the mobile station 12 has selected the channel (CH-1 to CH-3) allocated to the group incoming call, as described later, the mobile station 12 receives the calling channel for some group numbers. Therefore, not only the call information for each group but also the arrival of individual call information addressed to UID = 10 can be detected. In the table of FIG. 3, when the group-specific call information incoming channel is selected, the mobile station 12 has one group of group-specific call information that can detect an incoming call. On the other hand, by setting a plurality of incoming ID numbers to be associated with each other, it is also possible to detect incoming calls of group-specific call information addressed to a plurality of groups.

  Returning to the table of FIG. 3, for example, in the mobile station 12 to which UID = 10 is assigned as the mobile station ID, when the user selects 4 channels (CH-4) or 5 channels (CH-5), The mobile station 12 performs processing related to incoming individual call information addressed to the own station with respect to the individual call information of UID = 10 from the other mobile stations 12. Further, when the user presses the PTT key, individual call information to the mobile station with UID = 30 or 4 is transmitted to the base station 11 through the uplink control channel.

  When the mobile station 12 has selected the channel assigned to the individual call information, it receives only the call channel of the group number corresponding to its own UID, as will be described later with reference to FIG. Since the reception of the call channels having other group numbers is thinned out for power saving, the call information for each group addressed to the group of the own station cannot be received.

  FIG. 4 is a signal configuration diagram in the radio communication system 10 showing the relationship between superframes, frames, and slots in the TDMA system. One frame period is 40 ms (4 slot configuration), and one superframe period is 720 ms. As physical channels independent for each slot, there are a control physical channel and a communication physical channel. The control physical channel and the communication physical channel may be mixed in one carrier as shown in the second stage arrangement from the bottom in FIG. In the wireless communication system 10, there are one downlink carrier and one uplink carrier, and their frequencies are different.

  FIG. 5 shows an arrangement example of BCCH, PCH, and SCCH in the downlink control physical channel in the TDMA scheme. BCCH is a broadcast channel that broadcasts control channel structure information and system information to the mobile station 12. The PCH is a general paging channel that designates a UID and notifies that there is an incoming call request to the mobile station 12. The SCCH is a signaling channel that transmits call connection information such as communication channel designation information to the mobile station 12 that has recognized that there is an incoming call request on the general call channel.

  In the downlink carrier of FIG. 5, a communication physical channel and a control physical channel are mixed in each frame of the carrier as in the channel arrangement in the second stage from the bottom of FIG. Also, slot numbers 0 to 2 of each frame are assigned communication physical channels, and slot number 3 of each frame is assigned control physical channels. Each frame is transmitted from the base station 11 in a time division manner in the carrier. When assembling the superframe of the downlink control physical channel, the slot of slot number 3 is arranged in time order from each frame.

  In FDMA, the control physical channel and the communication physical channel are transmitted on different carriers, and the control physical channel and the communication physical channel are not mixed in each carrier. Also, each frame in the downlink carrier for the control physical channel is 1 slot instead of 4 slots. That is, 1 frame = 1 slot.

  FIG. 6 shows the relationship between the superframe and the reception power supply state in the individual incoming call waiting mode period of the mobile station 12. The relationship diagram of FIG. 6 and FIG. 7 described later is applied to the case where the mobile station 12 supports both TDMA and FDMA. The arrangement example of BCCH and the like in the downlink control physical channel described in the upper half of FIGS. 6 and 7 is common to both TDMA and FDMA. BCCH is arranged at the head of the super frame. The super frame includes one PCH (calling channel) corresponding to the group number, and the PCHs are arranged in the group number in the super frame.

  The group number Su of the call channel assigned to each individual call information is calculated by the following calculation formula (a), for example. Here, n is the total number of group numbers. Also, mod is an operator that calculates the remainder when the left number is divided by the right number. Note that the calculation formula (a) is an example, and other calculation formulas for Su can be adopted.

Su = (UID mod n) +1 (a)

  For example, considering the mobile station 12 with UID = 5, GID = 6, and n = 5, the mobile station 12 has Su = 1. Reception ON / OFF in the lower part of FIG. 6 means that the mobile station 12 is in a reception state and a stop state. The mobile station 12 in which Su = 1 operates only during the transmission period of the calling channel with the group number 1, and stops receiving operations during the transmission periods of the calling channels with the other group numbers. Thereby, power consumption in the mobile station 12 can be saved.

  Each mobile station 12 may receive a frame transmission period including a broadcast channel (BCCH) control channel as a slot at all times, and some of them may be appropriate. The frame of the broadcast channel may be received at intervals. The latter saves power. Further, since the mobile station 12 does not receive a calling channel having a group number other than group number = Su during the individual incoming call mode period, it cannot detect a group incoming call addressed to itself.

  Each mobile station 12 distinguishes whether the data of the calling channel having the group number Su is UID or GID as follows, for example. If the bit length of the ID is 24 bits, for example, the leading 1 bit is used as a UID / GID identification bit. Thus, when the first 1 bit is “0”, the remaining 23 bits indicate UID, and when it is “1”, the remaining 23 bits indicate GID. In addition, a 24-bit ID is set through the UID and GID, and if an ID less than a predetermined value is received, it is determined as individual call information. If an ID greater than the predetermined value is received, a group-specific call is received. You may make it judge that it is information.

  FIG. 7 shows the relationship between the superframe and the reception power supply state in the group incoming standby mode period of the mobile station 12. The mobile station 12 is maintained in the receiving operation state for the transmission periods of the calling channels of all the group numbers. As in the case of FIG. 6, the broadcast channel (BCCH) may be received constantly, or may be received appropriately.

  In this way, the mobile station 12 receives the group-specific call information transmitted by the base station 11 using a call channel having an arbitrary group number, and determines whether or not the group-specific call information is directed to the group to which the mobile station belongs. Determine. As described with reference to FIG. 3, in the mobile station 12, when the user selects one of the channels 1 to 3 in advance, the current group of the own station is switched.

  8 and 9 are block diagrams of the base station 30 and the mobile station 40, respectively. The wireless communication system includes at least one base station 30 and a plurality of mobile stations 40. A specific example of the wireless communication system is the above-described wireless communication system 10 (FIG. 1), and specific examples of the base station 30 and the mobile station 40 are the above-described base station 11 and mobile station 12, respectively.

  In FIG. 8, the base station 30 includes first call channel assignment means 31, second call channel assignment means 32, and downlink control channel transmission means 33. The first call channel assignment means 31 assigns individual call information for each mobile station 40 to a call channel having a group number corresponding to the identifier of the mobile station 40. The second call channel assigning means 32 assigns the group-specific call information for each group of the mobile station 40 to a call channel of an arbitrary group number so that each group call information is assigned to a separate call channel. Assign. The downlink control channel transmission means 33 wirelessly transmits the call channel sequence arranged in a predetermined order for the call channels of each group number using the downlink control channel.

  Specific examples of the mobile station identifier and the group identifier are UID and GID in the base station 11. The mobile station identifier and the group identifier may be a mutually independent identifier assigning system or may be a combined identifier assigning system. That is, in the former case, the mobile station identifier and the group identifier may be the same ID in a certain mobile station 40, such as mobile station identifier = 1 and group identifier = 1. In the former, whether the data of the calling channel of each group number is a mobile station identifier or a group identifier is distinguished depending on whether the first bit is “0” or “1” as described above, for example. In the latter case, for example, if identifier <predetermined value, the identifier is UID, and if identifier ≧ predetermined value, it is determined that the identifier is GID. It is also possible to set the identifier to be GID if the identifier <predetermined value, and to set the identifier to be UID if identifier ≧ predetermined value.

  One mobile station 40 may belong to a plurality of groups and be associated with a plurality of group identifiers. The radio communication system including the base station 30 and the mobile station 40 can be applied to both TDMA and FDMA radio communication systems. The method of determining the group number associated with the mobile station identifier depends on, for example, the above-described calculation formula (a).

  In the wireless communication system, the call channel for each group number is shared by the call channel for notifying individual call information and the call channel for notifying call information for each group. It is not necessary to set the paging channel as a downlink control channel, and the required number of paging channels in the downlink control channel can be reduced or a desired number of group numbers can be secured.

  In the wireless communication system, the individual call information is transmitted using the call channel of the group number associated with the mobile station identifier, while the call information for each group makes the group number indefinite, In other words, it is possible to perform transmission using a calling channel having an arbitrary group number without associating the group number with the group identifier. Thereby, the transmission time of call information classified by group can be advanced. In particular, when a plurality of group calls with different groups occur almost simultaneously, the plurality of groups are stored one after another in a call channel having a group number that is available and transmitted, thereby greatly reducing the postponement time. be able to.

  Preferably, the second call channel assignment means 32 assigns the group-specific call information to a call channel having a group number different from the group number to which the individual call information is currently assigned. Both the individual call information and the group-specific call information may be included in the same call channel, but in this case, the data size of the call channel increases, and a transmission frame is adopted as a data format that can cope with this. There must be. On the other hand, by using each call channel for transmission of only one individual call information or one group-specific call information, the format size of the call channel can be made small and fixed.

  In FIG. 9, the mobile station 40 includes downlink control channel receiving means 41, individual call information extracting means 42 and group call information extracting means 43. Preferably, the mobile station 40 further includes standby mode detection means 47 and reception operation control means 48.

  The downlink control channel receiving means 41 receives a paging channel sequence arranged in a predetermined order for the paging channels of each group number through a radio downlink control channel. The individual call information extraction means 42 extracts the individual call information addressed to the own station from the call channel of the group number assigned for notifying the individual call information to the own station in the downlink control channel. The group-specific call information extraction means 43 extracts group-specific call information addressed to the group to which the own station belongs from all call channels in the downlink control channel.

  Typically, the downlink control channel receiving unit 41 receives a sequence of frames assigned to each calling channel of each group number as a calling channel sequence. Then, the standby mode detecting means 47 waits for both the first standby mode in which only the individual call information addressed to the own station is standby, the individual call information addressed to the own station, and the group-specific call information addressed to the own station group. Which one of the standby modes is selected is detected. When the first standby mode is selected, the reception operation control means 48 downloads in the reception period of the frame corresponding to the call channel of the group number other than the group number to which the individual call information addressed to the own station is assigned. The control channel receiving means 41 stops its reception operation.

  In FIG. 3 of the wireless communication system 10 described above, the period in which the channel number 4 or 5 is selected corresponds to the first standby mode. The period during which any one of channel numbers 1 to 3 is selected corresponds to the second standby mode.

  10 and 11 are flowcharts of the base station control method 50 and the mobile station control method 60, respectively. The base station control method 50 and the mobile station control method 60 are applied to the base station 30 and the mobile station 40, respectively. In the mobile station control method 60, the execution order of S62 and S63 is arbitrary, and parallel processing can also be performed.

  In the base station control method 50 of FIG. 10, in S 51, the individual call information for each base station 30 is assigned to the call channel having the group number corresponding to the identifier of the base station 30. In S52, the group-by-group call information for each group of the mobile station 40 is assigned to a call channel having an arbitrary group number so that each group-by-group call information is assigned to a separate call channel. In S53, a paging channel sequence arranged in a predetermined order for the paging channels of each group number is wirelessly transmitted by the downlink control channel.

  In the mobile station control method 60 of FIG. 11, in S61, a paging channel sequence arranged in a predetermined order for the paging channels of each group number is received by the radio downlink control channel. In S62, the individual call information addressed to the own station is extracted from the call channel of the group number assigned for notifying the individual call information to the own station in the downlink control channel. In S63, the call information for each group addressed to the group to which the own station belongs is extracted from all call channels in the downlink control channel.

  The processes of S51 to S53 correspond to the functions of the first call channel assignment unit 31 to the downlink control channel transmission unit 33 of the base station 30 (FIG. 8), respectively. Therefore, the specific mode described for the functions of the first paging channel assignment unit 31 to the downlink control channel transmission unit 33 can be applied as a specific mode for the processing of S51 to S53.

  The processes of S61 to S63 correspond to the functions of the downlink control channel receiving unit 41 to the group-specific call information extracting unit 43 of the mobile station 40 (FIG. 9), respectively. Therefore, the specific mode described for the functions of the downlink control channel receiving unit 41 to the group-specific call information extracting unit 43 can be applied as a specific mode for the processing of S61 to S63.

  In the mobile station control method 60, steps for executing processes corresponding to the functions of the standby mode detection means 47 and the reception operation control means 48 can be appropriately added. The steps corresponding to the standby mode detection means 47 and the reception operation control means 48 are arranged in that order before S61. In S61, when the first standby mode is selected, in the frame reception period corresponding to the call channel having a group number other than the group number to which the individual call information addressed to the own station is assigned, the downlink control channel The receiving means stops the receiving operation.

  This specification discloses various inventions. In these inventions, in the best mode of the invention in the present specification, one or a plurality of elements exhibiting independent actions and effects are extracted, or one or a plurality of elements are changed within a obvious range In addition, a combination of one or a plurality of elements interchanged between the forms of the invention is obvious.

1 is a schematic diagram of a wireless communication system. It is a figure which illustrates the various number information which the predetermined mobile station has memorize | stored in the memory. It is a figure which shows an example of the ID number of the incoming call and transmission matched with each channel number in the mobile station. It is a signal block diagram in the radio | wireless communications system which showed the relationship between the super frame in a TDMA system, a frame, and a slot. It is a figure which shows the example of arrangement | positioning of BCCH, PCH, and SCCH in the physical channel for downlink control in a TDMA system.

It is a figure which shows the relationship between a super-frame and the receiving power supply state in the separate call waiting mode period of a mobile station. It is a figure which shows the relationship between a super-frame in a group incoming call waiting mode period of a mobile station, and a receiving power supply state. It is a block diagram of a base station. 2 is a block diagram of a mobile station 40. FIG. It is a flowchart of a base station control method. It is a flowchart of a mobile station control method.

Explanation of symbols

30: base station, 31: first call channel assignment means, 32: second call channel assignment means, 33: downlink control channel transmission means, 40: mobile station, 41: downlink control channel reception means, 42: Individual call information extraction means, 43: Group-specific call information extraction means, 47: Standby mode detection means, 48: Reception operation control means, 50: Base station control method.

Claims (7)

First call channel assignment means for assigning individual call information for each mobile station to a call channel having a group number corresponding to the identifier of the mobile station;
Group-specific call information for each group of mobile stations, each group-specific call information is assigned to a separate call channel , and each mobile station is grouped to a group to which the own station belongs from all the call channels. A second call channel allocating means for allocating the call information of the group number so that the call information can be extracted , and a call channel sequence arranged in a predetermined order for the call channel of each group number by the downlink control channel Downlink control channel transmission means for wireless transmission;
A base station comprising:   2. The second call channel assignment means assigns group-specific call information to a call channel having a group number different from the group number to which the individual call information is currently assigned. The listed base station. A downlink control channel receiving means for receiving, by a wireless downlink control channel, a calling channel sequence arranged in a predetermined order for each group number calling channel;
Individual call information extraction means for extracting individual call information addressed to the own station from the call channel of the group number assigned for notification of individual call information to the own station in the downlink control channel, and all call channels in the downlink control channel From the group-specific call information extracting means for extracting the group-specific call information addressed to the group to which the own station belongs,
A mobile station comprising: The downlink control channel receiving means for receiving, as the calling channel sequence, a sequence of frames allocated one by one to the calling channel of each group number;
Either the first standby mode in which only the individual call information addressed to the own station is waited or the second standby mode in which both the individual call information addressed to the own station and the group-specific call information addressed to the own station group are selected is selected. Standby mode detecting means for detecting whether or not, and when the first standby mode is selected, a reception period of a frame corresponding to a call channel having a group number other than the group number to which individual call information addressed to the own station is assigned Then, the reception operation control means for stopping the reception operation to the downlink control channel reception means,
The mobile station according to claim 3, further comprising:   A wireless communication system comprising the base station according to claim 1 or 2 and the mobile station according to claim 3 or 4. Assigning individual call information for each mobile station to a call channel having a group number corresponding to the identifier of the mobile station;
Group-specific call information for each group of mobile stations, each group-specific call information is assigned to a separate call channel , and each mobile station is grouped to a group to which the own station belongs from all the call channels. A step of assigning call information to a call channel having a group number such that the call information can be extracted ; and a step of wirelessly transmitting a call channel sequence arranged in a predetermined order for the call channel of each group number using a downlink control channel;
A base station control method comprising: Receiving a paging channel sequence arranged in a predetermined order for paging channels of each group number by a radio downlink control channel;
A step of extracting the individual call information addressed to the own station from the call channel of the group number assigned for notification of the individual call information to the own station in the downlink control channel, and the own station from all the call channels in the downlink control channel Extracting group-specific call information addressed to the group to which
A mobile station control method comprising:

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