JP3913557B2 - Radio base apparatus, transmission channel allocation method, and transmission channel allocation program - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a radio base apparatus, a transmission channel allocation method, and a transmission channel allocation program, and in particular, a radio base apparatus in which a plurality of mobile terminal apparatuses can be path-multiplexed in a mobile communication system, and such a radio base apparatus. The present invention relates to a transmission channel assignment method and a transmission channel assignment program when a change occurs in the path multiplex connection state.
[0002]
[Prior art]
2. Description of the Related Art In recent years, mobile communication systems (for example, Personal Handyphone System: hereinafter referred to as PHS), which are rapidly developing, are divided into a plurality of times by spatially dividing the same time slot of the same frequency in order to improve the frequency utilization efficiency of radio waves. A PDMA (Path Division Multiple Access) system has been proposed that allows a user's mobile terminal apparatus to be path-multiplexed to a base station. In this PDMA system, signals from each user's mobile terminal apparatus are separated and extracted by known adaptive array processing.
[0003]
In such a PDMA mobile communication system, the reception timing (also referred to as a synchronization position) at which a signal transmitted from each mobile terminal apparatus arrives at the base station is the distance between the terminal apparatus and the base station due to the movement of the terminal apparatus. Fluctuates due to various factors, such as changes in radio waves and fluctuations in radio wave propagation path characteristics.
[0004]
In a PDMA type mobile communication system, when mobile terminal devices of a plurality of users are connected by path multiplexing in the same time slot, the reception timings of received signals from the respective mobile terminal devices fluctuate due to the above-mentioned reasons. They may be close to each other or, in some cases, temporal contexts may intersect.
[0005]
If the reception timing is too close, the correlation value between the received signals from a plurality of mobile terminal devices increases, and the accuracy of signal extraction for each user by adaptive array processing deteriorates. For this reason, the call characteristic for each user also deteriorates.
[0006]
In PHS, a received signal from each mobile terminal apparatus includes a reference signal section made up of a known bit string common to all users for each frame, and does not include specific definition information unique to each user. If the reception timings of the received signals from the mobile terminal devices of a plurality of users coincide with each other, the reference signal sections of the received signals overlap so that the users cannot be identified and separated from each other. SWAP).
[0007]
Therefore, it is necessary to control the reception timing of these mobile terminal devices so that the reception timings of the mobile terminal devices of a plurality of users that are path-multiplex connected to the same time slot do not approach or cross each other.
[0008]
As a method for controlling the reception timing from the mobile terminal apparatus, it is effective to control the transmission timing from the base station to the mobile terminal apparatus.
[0009]
The reason why the reception timing for each user can be controlled by controlling the transmission timing for each user will be described.
[0010]
For example, in a mobile communication system such as PHS, for the timing of signal transmission / reception between a base station and a mobile terminal device, the mobile terminal device is directed to the base station a predetermined time after receiving a signal from the base station. The standard determines that signals are transmitted.
[0011]
That is, if the signal transmission timing is shifted for each user in the base station, the signal reception timing is shifted for each corresponding mobile terminal device. Therefore, the timing for transmitting a signal from each mobile terminal apparatus to the base station is also shifted for each mobile terminal apparatus.
[0012]
As a result, the timing of signal reception from each mobile terminal apparatus in the base station is shifted for each mobile terminal apparatus.
[0013]
In this way, in the base station, by controlling the signal transmission timing for each mobile terminal device, the reception timing from each mobile terminal device in the base station can be indirectly controlled. It is also possible to control the reception timing so as to leave.
[0014]
More specifically, in the base station, by maximizing the time difference between the transmission timings for a plurality of users that are path-multiplexed to the same time slot, the reception timings from these users are prevented from approaching each other. In addition, it has been proposed to stabilize the communication quality at the time of path multiplex connection.
[0015]
By maximizing the time difference of the transmission timing on the base station side in this way, it becomes easy to identify between multiple users even on the terminal side that is inferior in reception performance compared to the base station, while on the base station side, even between users Even when the time difference in reception timing is relatively small, multiple users can be separated by adaptive array processing.
[0016]
[Problems to be solved by the invention]
However, even in the case of a base station, if the reception timings of multiple users are completely the same, adaptive array processing will no longer allow separation between multiple users in principle. Will occur.
[0017]
That is, in a mobile communication system, it is usually possible that the difference in distance between each of a plurality of mobile terminal apparatuses connected in multiple ways and the base station is large, even if transmission is performed on the base station side. Even when the time difference in timing is maximized, the reception timing between multiple users in the base station is reduced due to such a delay time caused by the distance difference for each user, and in some cases, it may be completely overlapped.
[0018]
In addition to the time delay due to such a distance difference, the time difference of the transmission timing may be shortened when receiving the base station due to the characteristic difference of each mobile terminal apparatus. That is, as described above, the standard determines that a mobile terminal apparatus transmits a signal to a base station after a predetermined time has elapsed after receiving a signal from the base station.
[0019]
However, due to the characteristic difference of each mobile terminal device, a terminal that transmits a transmission signal to the base station earlier than the predetermined time after the terminal receives the transmission signal from the base station (early terminal), or conversely There is a terminal (delay terminal) that transmits a transmission signal to the base station later than the predetermined time.
[0020]
Due to the difference in characteristics of each mobile terminal device, even if the time difference of the transmission timing is maximized on the base station side, the reception timing between multiple users in the base station is reduced, and in some cases, it completely overlaps. Things also happen.
[0021]
Furthermore, in a mobile communication system such as PHS, since time division multiplexing is basically performed, the time width of each time slot cannot be increased, and therefore the time difference of transmission timing is maximized. There is a limit.
[0022]
Due to these various factors, just because the transmission timing of multiple users is generally maximized in the base station, it is not always possible to realize good call characteristics by separating multiple users during reception.
[0023]
Such a problem will be described with reference to the timing chart of FIG.
As shown in FIG. 9A, a certain difference (for example, in the transmission timing from the base station for two users, users 1 and 2 multiplexly connected to the time slot within a time slot (for example, The base station performs transmission timing control so that a time equivalent to 3.0 symbols is given.
[0024]
Here, for the users 1 and 2, if there is no delay time due to the distance difference as described above, and no characteristic difference between the terminal devices (early / delay), as shown in FIG. The timing difference (3.0 symbols in (a)) formed at the time of transmission is directly reflected in the reception timing difference at the base station, so that multiple users are well separated from each other and good call characteristics are realized.
[0025]
However, as shown in FIG. 9C, when the terminal of user 1 is a delayed terminal, the base station reception timing of user 1 is delayed. That is, the timing difference of 3.0 symbols at the time of base station transmission is eroded and the reception timing difference at the base station becomes 3.0 symbol difference or less, and the reception timings of multiple users 1 and 2 are close to each other. ), The accuracy of separation between multiple users due to adaptive array processing is degraded. As a result, call characteristics may be degraded.
[0026]
Furthermore, as shown in FIG. 9D, when the user 1 is far away and the distance difference is large, the base station reception timing of the user 1 is significantly delayed due to the delay time. For this reason, the reception timings of the users 1 and 2 are very close to each other, so that the separation accuracy between users is deteriorated, and consequently, interference between users (SWAP) occurs.
[0027]
In particular, if it is necessary to change the path multiplexing state, such as a connection request of a new user or disconnection of an already connected user, if such a change is executed without considering the base station reception timing difference of the multiplexed user after the change, After the change, there is a possibility that the above-described deterioration of the call characteristics and interference between users may occur.
[0028]
SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide a radio base apparatus, transmission channel allocation, and the like, which prevent deterioration of call characteristics and interference between users after the change even when the path multiplexing state needs to be changed. A method and a transmission channel assignment program are provided.
[0029]
[Means for Solving the Problems]
According to one aspect of the present invention, a radio base apparatus to which a plurality of mobile terminal apparatuses can be path-multiplexed includes a timing prediction unit, a timing determination unit, and a state change restriction unit. When a change occurs in the path multiplex connection state in a certain time slot, the timing predicting means predicts a reception timing from the mobile terminal apparatus that should move the transmission timing from the radio base apparatus due to the change. The timing determination means determines whether or not the predicted reception timing is more than a predetermined value from each of the reception timings from other mobile terminal apparatuses that are path-multiplex connected to the time slot. The state change restricting means restricts the change of the path multiplex connection state when the determining means determines that the distance is not more than the predetermined value.
[0030]
Preferably, the radio base apparatus further includes a receivability determining unit that determines whether or not the predicted reception timing falls within a receivable window of the time slot of the radio base apparatus.
[0031]
According to another aspect of the present invention, a radio base apparatus capable of path multiplex connection of a plurality of mobile terminal apparatuses includes a transmission timing moving means, a reception timing predicting means, a timing determining means, and a receivability determining means. And a connection prohibition means. When there is a mobile terminal device that is newly trying to make a path multiplex connection within a certain time slot, the transmission timing moving means is arranged so that the reception timings from all the mobile terminal devices that make a path multiplex connection after the new connection are separated from each other in that time slot. The transmission timing for the mobile terminal apparatus which is newly trying to make a path multiplex connection is moved. The reception timing prediction means predicts the reception timing when the transmission timing of the mobile terminal apparatus to be newly connected by path multiplexing is moved. The timing determination means is configured such that a predicted reception timing of a mobile terminal device to be newly path-multiplexed is equal to or greater than a predetermined value with each of reception timings from other mobile terminal devices already path-multiplexed to the time slot. It is determined whether or not they are separated. The receivability determining unit determines whether or not the predicted reception timing of the mobile terminal device newly attempting to be path-multiplexed is within the receivable window of the time slot of the radio base device. The connection prohibiting means is a mobile terminal that is newly trying to make a path multiplex connection when it is determined by the timing determining means that the distance is not more than a predetermined value or when it is determined by the receivable determining means that it does not fall within the receivable window. Prohibit connection of the device to the time slot.
[0032]
Preferably, the reception timing prediction means calculates a time difference between a transmission timing before connection to the time slot of a mobile terminal device to be newly connected to the path and a transmission timing predicted when the transmission timing is moved. And means for calculating a predicted reception timing by adding a time difference to the reception timing before connection to the time slot of the mobile terminal device to be newly connected by path multiplexing.
[0033]
Preferably, the mobile terminal apparatus newly attempting to make a path multiplex connection is a mobile terminal apparatus newly attempting to make a path multiplex connection to a radio base apparatus.
[0034]
Preferably, the mobile terminal apparatus newly attempting to perform path multiplex connection is a mobile terminal apparatus newly attempting to perform path multiplex connection from another time slot of the radio base apparatus to the time slot.
[0035]
According to still another aspect of the present invention, a radio base apparatus capable of path multiplex connection of a plurality of mobile terminal apparatuses includes a transmission timing moving means, a reception timing prediction means, a timing determination means, and a receivability determination means. And movement prohibiting means. If there is a mobile terminal device that is to be disconnected from a plurality of mobile terminal devices that are already path-multiplexed within a certain time slot, the transmission timing moving means is configured to continue the path multiplex connection after disconnection in that time slot. The transmission timing for at least one of the remaining mobile terminal devices is moved so that the reception timings from all of the mobile terminal devices are separated from each other. The reception timing prediction means predicts the reception timing when the transmission timing of at least one of the mobile terminal apparatuses is moved. The timing determination means determines whether or not the predicted reception timing of at least one of the mobile terminal apparatuses is more than a predetermined value from each of the reception timings from other mobile terminal apparatuses that are path-multiplex connected to the time slot. Determine. The receivability determining unit determines whether or not the predicted reception timing of at least one of the mobile terminal devices falls within the receivable window of the time slot of the radio base device. The movement prohibiting means moves the transmission timing by the transmission timing moving means when it is determined by the timing determining means that the distance is not more than the predetermined value, or when it is determined by the receivability determining means that it does not fall within the receivable window. Ban.
[0036]
Preferably, the reception timing prediction means calculates a time difference between the transmission timing before the movement of at least one of the mobile terminal devices and the transmission timing predicted when the transmission timing is moved, and at least one of the movements Means for calculating a predicted reception timing by adding a time difference to the reception timing before the terminal device moves.
[0037]
According to still another aspect of the present invention, a transmission channel assignment method in a radio base station capable of path multiplex connection of a plurality of mobile terminal apparatuses is performed when a change occurs in a path multiplex connection state in a certain time slot. A step of predicting a reception timing from a mobile terminal device that should move a transmission timing from a radio base device due to the change, and another mobile terminal in which the predicted reception timing is path-multiplex connected to the time slot A step of determining whether or not each of the reception timings from the apparatus is separated by a predetermined value or more, and a step of restricting a change in the path multiple connection state when it is determined that the reception timing is not separated by a predetermined value or more.
[0038]
Preferably, the transmission channel allocation method further includes a step of determining whether or not the predicted reception timing falls within a reception window of the time slot of the radio base apparatus.
[0039]
According to still another aspect of the present invention, there is provided a transmission channel assignment method in a radio base apparatus capable of path multiplex connection of a plurality of mobile terminal apparatuses. A mobile terminal apparatus newly attempting path multiplex connection within a certain time slot. If there is, the step of moving the transmission timing for the mobile terminal device to be newly newly connected by path multiplexing so that the reception timings from all the mobile terminal devices that are path-multiplexed after the new connection in the time slot are separated from each other; When the transmission timing of the mobile terminal apparatus that is going to be path-multiplexed is moved, and the predicted reception timing of the mobile terminal apparatus that is newly going to be path-multiplexed is the time slot. From other mobile terminals that already have multiple paths A step of determining whether or not each of the communication timings is more than a predetermined value, and a predicted reception timing of the mobile terminal device to be newly connected by path multiplexing is within the receivable window of the time slot of the radio base device And if it is determined that it is not separated by a predetermined value or more, or if it is determined that it does not fall within the receivable window, the mobile terminal device to be newly connected by path multiplexing And prohibiting connection to the time slot.
[0040]
Preferably, the step of predicting the reception timing includes a time difference between a transmission timing before connection to the time slot of the mobile terminal device to be newly connected to the path and a transmission timing predicted when the transmission timing is moved. And a step of calculating a predicted reception timing by adding a time difference to a reception timing before connection to the time slot of a mobile terminal device to be newly connected for path multiplexing.
[0041]
Preferably, the mobile terminal apparatus newly attempting to make a path multiplex connection is a mobile terminal apparatus newly attempting to make a path multiplex connection to a radio base apparatus.
[0042]
Preferably, the mobile terminal apparatus newly attempting to perform path multiplex connection is a mobile terminal apparatus newly attempting to perform path multiplex connection from another time slot of the radio base apparatus to the time slot.
[0043]
According to still another aspect of the present invention, a transmission channel assignment method in a radio base apparatus in which a plurality of mobile terminal apparatuses can be path-multiplexed is a plurality of mobile terminals that are already path-multiplexed within a certain time slot. If there is a mobile terminal device to be disconnected from among the devices, at least the remaining mobile terminal devices are separated from each other so that the reception timings from all of the remaining mobile terminal devices that continue the path multiplex connection after disconnection in the time slot are separated from each other. A step of moving a transmission timing for any of the steps, a step of predicting the reception timing when the transmission timing of at least one of the mobile terminal devices is moved, and a predicted reception timing of at least any of the mobile terminal devices. , Other path multiple connections to the time slot A step of determining whether or not each of the reception timings from the mobile terminal device is a predetermined value or more, and a predicted reception timing of at least one of the mobile terminal devices is a receivable window of the time slot of the radio base device And a step of prohibiting movement of transmission timing when it is determined that it is not within a predetermined value or when it is determined that it is not within the receivable window.
[0044]
Preferably, the step of predicting the reception timing includes at least one of calculating a time difference between a transmission timing before movement of at least one of the mobile terminal devices and a transmission timing predicted when the transmission timing is moved. Calculating a predicted reception timing by adding a time difference to the reception timing before the mobile terminal device moves.
[0045]
According to still another aspect of the present invention, a transmission channel assignment program in a radio base station capable of path multiplex connection of a plurality of mobile terminal apparatuses causes a change in a path multiplex connection state in a certain time slot in a computer In this case, the step of predicting the reception timing from the mobile terminal apparatus that should move the transmission timing from the radio base apparatus due to the change, and the predicted reception timing are connected to the time slot by path multiplexing A step of determining whether or not the reception timing from each of the mobile terminal devices is more than a predetermined value, and a step of restricting a change in the path multiple connection state if it is determined that the reception timing is not more than the predetermined value Let
[0046]
Preferably, the transmission channel allocation program further causes the computer to execute a step of determining whether or not the predicted reception timing falls within a reception window of the time slot of the radio base apparatus.
[0047]
According to still another aspect of the present invention, a transmission channel assignment program in a radio base apparatus capable of path multiplexing connection of a plurality of mobile terminal apparatuses newly attempts to path multiplexing a computer within a certain time slot. When there is a mobile terminal device, the step of moving the transmission timing for the mobile terminal device to be newly connected to the path multiple connection so that the reception timings from all the mobile terminal devices to which the path multiple connection is made after the new connection is separated from each other in the time slot And a step of predicting the reception timing when the transmission timing of the mobile terminal apparatus to be newly connected to the path is moved, and the predicted reception timing of the mobile terminal apparatus to be newly connected to the path are as follows: Multiple paths are already connected to the time slot A step of determining whether or not a reception value from each mobile terminal apparatus is more than a predetermined value, and a predicted reception timing of a mobile terminal apparatus to be newly path-multiplexed is determined by the time of the radio base apparatus A step of determining whether or not the slot can be received within the reception window, and if it is determined that it is not separated by a predetermined value or more, or if it is determined that it does not fall within the reception window, a new path multiple connection is attempted. And a step of prohibiting connection of the mobile terminal device to the time slot.
[0048]
Preferably, the step of predicting the reception timing includes a time difference between a transmission timing before connection to the time slot of the mobile terminal device to be newly connected to the path and a transmission timing predicted when the transmission timing is moved. And a step of calculating the predicted reception timing by adding a time difference to the reception timing before connection to the time slot of the mobile terminal device to be newly connected for path multiplexing.
[0049]
Preferably, the mobile terminal apparatus newly attempting to make a path multiplex connection is a mobile terminal apparatus newly attempting to make a path multiplex connection to a radio base apparatus.
[0050]
Preferably, the mobile terminal apparatus newly attempting to perform path multiplex connection is a mobile terminal apparatus newly attempting to perform path multiplex connection from another time slot of the radio base apparatus to the time slot.
[0051]
According to still another aspect of the present invention, there is provided a transmission channel allocation program in a radio base apparatus capable of path multiplex connection of a plurality of mobile terminal apparatuses. If there is a mobile terminal device to be disconnected from among the mobile terminal devices, the remaining mobile terminals are separated from each other so that reception timings from all of the remaining mobile terminal devices that continue the path multiplex connection after disconnection in the time slot are separated from each other A step of moving a transmission timing for at least one of the devices, a step of predicting a reception timing when the transmission timing of at least one of the mobile terminal devices is moved, and a prediction of at least one of the mobile terminal devices The reception timing is A step of determining whether or not each of the reception timings from other mobile terminal devices that are connected in multiples is a predetermined value or more, and the predicted reception timing of at least one of the mobile terminal devices The step of determining whether or not it falls within the receivable window of the time slot, and if it is determined that it is not separated by a predetermined value or more, or if it is determined that it does not fall within the receivable window, the transmission timing is moved. The prohibited step is executed.
[0052]
Preferably, the step of predicting the reception timing includes at least one of calculating a time difference between a transmission timing before movement of at least one of the mobile terminal devices and a transmission timing predicted when the transmission timing is moved. Calculating a predicted reception timing by adding a time difference to the reception timing before the mobile terminal device moves.
[0053]
Therefore, according to the present invention, when it is necessary to change the path multiplexing state, such as a connection request for a new user or a disconnection of an already connected user, it is assumed that there is a difference in base station reception timing of the multiplexed user after the change, and the assumed reception Since such a change is executed only when the timing difference satisfies a predetermined condition, even if the path multiplexing state needs to be changed, the call characteristics are deteriorated or the interference between users is changed after the change. Can be prevented.
[0054]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. In the drawings, the same or corresponding parts are denoted by the same reference numerals and description thereof will not be repeated.
[0055]
FIG. 1 is a functional block diagram showing the overall configuration of a base station according to the present invention.
Referring to FIG. 1, signals from mobile terminal apparatuses of a plurality of users received by a plurality of base stations, for example, four antennas 1, 2, 3, 4 are transmitted to corresponding transmission / reception circuits 5, 6, 7, Each of the RF circuits 5a, 6a, 7a, and 8a is subjected to reception processing, and further converted into digital signals by the A / D and D / A converters 9, 10, 11, and 12.
[0056]
The four systems of received signals from the respective antennas converted into digital signals are given to a digital signal processor (DSP) 14 via a circulator 13. The inside of the DSP represented by the broken line 14 is a functional block diagram showing processing executed by the DSP in software.
[0057]
The four received signals given to the DSP 14 via the circulator 13 are given to the synchronization processing unit 15 a of the reception processing unit 15. The synchronization processing unit 15a accurately estimates the reception timing of each received signal from a plurality of users (user 1 and user 2 in this example) that are path-multiplex connected to the base station, using a known synchronization position estimation method. Then, the estimated reception timing is given to the control unit 17 for channel assignment processing.
[0058]
The synchronization window control unit 15b performs predetermined synchronization window control on the received signal.
Next, a known adaptive array process is performed on the received signal by the adaptive array processing unit 15c, and the received signals of the users 1 and 2 are separated and extracted using the calculated weights for the users 1 and 2.
[0059]
The separated signal for each user is demodulated by the detection unit 15 d and output from the DSP 14 as demodulated data of the users 1 and 2.
[0060]
On the other hand, data to be transmitted by the users 1 and 2 (such as audio data) is given to the modulation processing unit 16 a of the transmission processing unit 16 of the DSP 14. The data of users 1 and 2 modulated by the modulation processing unit 16a are given to one input of multipliers 16b and 16c, respectively.
[0061]
Further, the weights for the users 1 and 2 calculated by the adaptive array processing unit 15c are given to the other inputs of the multipliers 16b and 16c, and the transmission directivity of the data of the users 1 and 2 is determined.
[0062]
The outputs of the multipliers 16b and 16c are given to the transmission timing control unit 16d. The transmission timing control unit 16 d adjusts the data transmission timing of the users 1 and 2 based on the transmission timing control signal for the users 1 and 2 given from the control unit 17.
[0063]
The transmission signal synthesis processing unit 16e synthesizes the transmission signals of the users 1 and 2 and converts them into four transmission signals indicated by one arrow in the figure, and the A / D and D / A converters via the circulator 13 Allocate to 9, 10, 11, 12.
[0064]
The four transmission signals converted into analog signals by the A / D and D / A converters 9, 10, 11, and 12 are respectively transmitted to the corresponding RF circuits 5a, 6a, and 6 of the transmission / reception circuits 5, 6, 7, and 8, respectively. Transmission processing is performed at 7a and 8a, and the data is transmitted toward the mobile terminal device via corresponding antennas 1, 2, 3, and 4.
[0065]
FIG. 2 is a timing diagram for explaining the basic operation principle of the first example of the transmission timing control method which is a precondition for executing the transmission channel allocation method of the present invention.
[0066]
For example, in a PDMA mobile communication system, an uplink (mobile terminal device → base station) channel and a downlink (base station → mobile terminal device) channel transmit data in units of 4 slots alternately in time series. Both the uplink and the downlink have the same format.
[0067]
That is, a control channel (Control Channel: hereinafter, CCH) signal is assigned to the first slot 1. An information channel (Traffic Channel: TCH) signal is assigned to the subsequent three slots 2 to 4. The control channel signal CCH is used to activate the information channel TCH and establish an information (call) channel.
[0068]
A first example of a transmission timing control method to be described below is, for example, in a PDMA mobile communication system, in which a transmission timing for channel allocation to a new user is changed between a base station and a mobile terminal device in a control channel. By performing it during the communication period, the transmission timing interval to the already connected user can be maximized in the information (call) channel.
[0069]
Referring to FIG. 2A, first, the first multiplex user whose transmission timing is assigned to the head position of the transmission timing setting section of the slot is the last user of the transmission timing setting section during the call channel period. Moved to.
[0070]
Next, referring to FIG. 2B, the transmission timing to the second multiplexed user is assigned to the head position of the transmission timing setting section of the slot during the call channel period. Thereby, the transmission timing interval in the 2-multiplex state can be maximized.
[0071]
Here, for the third multiplex user who desires a new connection, the transmission timing is moved during the period in which the base station and the mobile terminal apparatus exchange signals using the control channel (see FIG. 2C). ) When the call channel is established, transmission timing control is executed so that the transmission timing is in the middle of the transmission timing setting section (see FIG. 2D).
[0072]
As a result, the transmission timing interval in the call channel can be extended to the maximum, and when a new user is connected, the optimal transmission timing is set from the beginning when the control channel period ends and the call channel is established. Can be realized.
[0073]
FIG. 3 is a flowchart showing the basic processing of the first example of the transmission timing control method shown in FIG. The process shown in FIG. 3 shows a case where up to 3 multiplexes are allowed in each slot, and is executed for each frame of the transmission signal by the DSP (control unit 17 in FIG. 1) of the base station.
[0074]
First, if a connection request for a new user is generated in step S11, the number of connected users in the slot is measured by the DSP in step S12.
[0075]
If the number of already connected users is 0 in step S12, in step S13, a new user (first multiplex) is permitted to connect to the slot, and after the transition to the call channel (TCH), the transmission timing is predetermined for each frame. The movement width α is delayed. This process is performed until the transmission timing reaches the end as shown in FIG.
[0076]
On the other hand, if it is determined in step S12 that the number of connected users is not 0, it is determined in step S14 whether or not the number of connected users is 1. If the number of already connected users is 1, in step S15, the new user (second multiplex) is permitted to connect to the slot, and as shown in FIG. Is assigned to the head position.
[0077]
On the other hand, if it is determined in step S14 that the number of connected users is not 1, it is determined in step S16 whether or not the number of connected users is 2. If the number of already connected users is 2, in step S17, the new user (third multiplex) is permitted to connect to the slot, and the transmission is performed on the control channel (CCH) as shown in FIG. The timing is moved to the middle of the section where the transmission timing can be set, and after the movement is completed, a call channel (TCH) is established (FIG. 2D).
[0078]
On the other hand, if it is determined in step S16 that the number of connected users is not 2, this means that there are already three or more multiplexed users. In this example, only up to 3 multiplexes are allowed, so connection to the slot is not permitted in step S18.
[0079]
Since the period of the control channel is short, the movement width α for each frame needs to be set relatively large.
[0080]
2 and 3 show a case where up to 3 multiplexing is allowed, but FIG. 4 is a timing diagram showing a procedure of a transmission timing control method when up to 4 multiplexing is possible.
[0081]
Referring to FIG. 4, in the case of allowing up to the fourth multiplex, the transmission timing of the third multiplex user 3 is delayed in advance to prepare for connection by the fourth user 4, and during the control channel period The transmission timing of the user 4 is moved to a position between the users 2 and 3. When the call channel is established, the four multiplexed users from the beginning have the optimum transmission timing interval.
[0082]
As described above, in the first example of the transmission timing control method shown in FIG. 2 to FIG. 4, characteristic deterioration is prevented by maintaining the transmission timing interval to the already connected user to the maximum in the call channel, and further new By assigning transmission timings to users during the control channel period, it is possible to realize an optimal transmission timing interval when a call channel is established.
[0083]
On the other hand, due to causes such as interference activation or abnormal disconnection, the number of users connected by path multiplexing to a specific slot may decrease. In the second example of the transmission timing control method which is a precondition for executing the transmission channel allocation method of the present invention, when such a situation occurs, the transmission timing is moved again to extend the transmission timing. To do.
[0084]
FIG. 5 is a timing diagram for explaining the basic operation principle of the second example of the transmission timing control method.
[0085]
Referring to FIG. 5A, it is assumed that, when users 1 to 4 are multiplexed four times, connection of user 1 is disconnected for some reason. In this case, the transmission timing is moved so as to extend the transmission timing interval between the remaining users.
[0086]
Specifically, first, the transmission timing for the user whose transmission timing is close to the end of the section where transmission timing can be set, that is, the transmission timing to user 2, is moved to the end (see FIG. 5B).
[0087]
Since the user 4 has already reached the head position, the transmission timing to the user 3 is moved to the middle of the transmission timing settable section without moving it (see FIG. 5C) (FIG. 5D). reference). As a result, the transmission timing interval between the remaining users can be extended to the maximum.
[0088]
FIG. 6 is a flowchart showing the basic processing of the second example of the transmission timing control method shown in FIG. The processing of FIG. 5 is executed for each frame of the transmission signal by the DSP 14 of the base station.
[0089]
When any user is disconnected, in step S21, the transmission timing to the user with the latest transmission timing in the slot is moved to the end of the transmission timing setting section (FIG. 5B). . In the following steps, the movement width for each frame is set to a value α in a range that can be followed by the mobile terminal apparatus.
[0090]
Next, in step S22, the transmission timing to another user with the earliest transmission timing in the slot is moved to the beginning of the transmission timing setting section (FIG. 5C).
[0091]
Finally, in step S23, the transmission timing to another user remaining in the slot is moved to the middle of the transmission timing setting section (FIG. 5D).
[0092]
As described above, according to the second example of the transmission timing control method, even when multiple users are reduced, the transmission timing interval can always be extended to the maximum by readjusting the transmission timing.
[0093]
However, even if the transmission timing is controlled on the base station side using the first and second examples of the transmission timing control method described above, after a new user is connected (first example of the transmission timing control method), Alternatively, the base station reception timing of multiple users after disconnection of already connected users (second example of the transmission timing control method) actually approaches or intersects due to the time delay due to the distance difference or the characteristic difference of the terminal device. In such a case, the call characteristics are deteriorated and user interference occurs.
[0094]
In the embodiment of the present invention described below, the proximity of multiple users does not occur assuming the actual reception timing when the path multiplexing state is changed, such as connection of a new user or disconnection of an already connected user. It is configured to allow the change only in the case.
[0095]
[Embodiment 1]
The control according to the first embodiment of the present invention described below is executed on the premise of a base station that executes the first example of the above-described transmission timing control method. That is, in the first embodiment, a connection of a new user to the base station or a TCH switching process is targeted. Here, TCH switching means that a user who is connected to a slot and is talking on a call channel switches the connection to the call channel TCH of another slot for some reason during the call.
[0096]
In other words, switching the call channel is equivalent to performing a process of assigning transmission timing to a new user from the switching destination slot.
[0097]
The control method according to Embodiment 1 of the present invention will be described below.
First, when there is a user requesting a new connection or a user who needs TCH switching (hereinafter collectively referred to as a new user), the transmission timing control method described with reference to FIGS. According to the example of 1, the transmission timing scheduled after the new connection is obtained.
[0098]
On the other hand, the current base station transmission timing of the new user is obtained. The current base station transmission timing means a predetermined transmission timing from the base station on the control channel CCH in the case of a user requesting a new connection, and in the case of a user who needs TCH switching, before TCH switching. Means the transmission timing from the base station on the communication channel TCH in another slot.
[0099]
The difference between the current base station transmission timing of such a new user and the base station transmission timing after the new connection predicted by the transmission timing control method, that is, the movement amount X of the base station transmission timing is calculated.
[0100]
Next, the current base station reception timing Z of the new user is obtained. The current base station reception timing means the reception timing from the terminal on the control channel CCH in the case of a user requesting a new connection, and in the case of a user who needs TCH switching, another slot before TCH switching. Means the reception timing from the terminal on the communication channel TCH. These reception timings are held in a storage device in the base station.
[0101]
The actual base station reception timing Y after the connection of the new user is predicted by adding the movement amount X of the calculated base station transmission timing to the current base station reception timing Z of the new user. be able to.
[0102]
Next, base station reception timings of existing users other than the new user are obtained. For example, in the case of the current 3 multiplex as shown in FIG. 4, the current base station reception timings b1, b2 and b3 of the connected users 1, 2 and 3 are obtained (these reception timings are stored in a storage device in the base station). Suppose it is retained).
[0103]
And the proximity determination of the base station reception timing after the newly predicted connection of the new user and the base station reception timing of the existing user is executed. More specifically, the difference between the predicted reception timing Y of the new user and the current reception timing b1 of the connected user 1 is greater than a predetermined threshold value α, and the predicted reception timing Y of the new user and the current status of the connected user 2 It is determined that the difference from the reception timing b2 is larger than the predetermined threshold value α, and that the difference between the predicted reception timing Y of the new user and the current reception timing b3 of the connected user 3 is larger than the predetermined threshold value α. Only in this case, the new user and the already connected user are not in a close relationship, and it is determined that there is no problem in separating multiple users even if the connection of the new user is permitted.
[0104]
If even one of the above three conditions is not satisfied, it is determined that the predicted reception timing of the new user and the current reception timing of the already connected user are in proximity, and the connection of the new user is not permitted.
[0105]
Next, it is determined whether or not the base station reception timing of the new user is in the base station receivable window area defined for each time slot. That is, even if the proximity determination with the connected user is cleared, if the predicted reception timing Y itself deviates from the receivable window of the slot, it cannot be received.
[0106]
Specifically, when the predicted base station reception timing Y is larger than the minimum position of the base station receivable window and the predicted base station reception timing Y is smaller than the maximum position of the base station receivable window. If determined, the new user is finally permitted to connect to the slot.
[0107]
FIG. 7 is a flowchart showing the basic processing of the transmission channel assignment method according to Embodiment 1 of the present invention as described above. This processing is executed by software by the DSP 14 in FIG.
[0108]
First, in step S31, when it is permitted to proceed to the multiple connection availability determination process for a new user, the process according to the first embodiment starts.
[0109]
In step S <b> 32, the difference between the current transmission timing of the new user and the predicted transmission timing after connection is calculated by the above-described method, and the movement amount X of the transmission timing is calculated.
[0110]
Next, in step S33, the transmission timing shift amount X is added to the current base station reception timing Z of the new user to predict the base station reception timing Y after connection.
[0111]
In step S34, it is determined whether or not the difference between the predicted reception timing and the reception timing of each existing user is greater than the threshold value α. If there is even one existing user whose difference is smaller than the threshold value α, the process proceeds to step S37, and new channel allocation (including TCH switching) is rejected.
[0112]
On the other hand, if it is determined in step S34 that all the differences between the predicted reception timing and the reception timing of each existing user are greater than the threshold value α, the process proceeds to step S35.
[0113]
In step S35, it is determined whether or not the predicted base station reception timing of the new user is within the receivable window of the base station. If it is determined that it has not been received, the process proceeds to step S37, and new channel assignment (including TCH switching) is rejected.
[0114]
On the other hand, if it is determined in step S35 that the predicted base station reception timing of the new user is within the receivable window of the base station, the process proceeds to step S36, and new channel allocation (including TCH switching) is permitted. Will be.
[0115]
As described above, according to Embodiment 1 of the present invention, the base station reception timing when a new user (including TCH switching) is connected is actually predicted, and the base station reception timings of other already connected users are estimated. Since the connection is permitted after the proximity determination is made, it is possible to prevent the deterioration of the call characteristics and the user interference after the connection of the new user.
[0116]
[Embodiment 2]
The control according to the second embodiment of the present invention described below is executed on the premise of a base station that executes the second example of the transmission timing control method described above. That is, the second embodiment is intended for a reduction in the number of multiple users due to disconnection or the like.
[0117]
The control method according to Embodiment 2 of the present invention will be described below.
First, when there is a user who is disconnected, an existing user who is requested to move after disconnection (hereinafter referred to as a mobile user) according to the second example of the transmission timing control method described with reference to FIGS. In the example of FIG. 5, for example, the transmission timing scheduled after the movement of the user 2 or 3) is obtained.
[0118]
On the other hand, the current (pre-movement) base station transmission timing of the mobile user is obtained.
A difference between the current base station transmission timing of the mobile user and the base station transmission timing after movement predicted by the transmission timing control method, that is, a movement amount X of the base station transmission timing is calculated.
[0119]
Next, the current (pre-movement) base station reception timing Z of the mobile user is obtained.
The actual base station reception timing Y after movement of the mobile user is predicted by adding the movement amount X of the base station transmission timing calculated above to the current base station reception timing Z of the mobile user. be able to.
[0120]
Next, base station reception timings of existing users other than mobile users are obtained. For example, in the case of 3 multiplexing after disconnection, the current base station reception timings b1 and b2 of two connected users other than the mobile user are obtained (these reception timings are assumed to be held in a storage device in the base station) ).
[0121]
And the proximity determination of the base station reception timing after the movement of the newly estimated mobile user and the base station reception timing of another existing user is performed. More specifically, the difference between the predicted reception timing Y of the mobile user and the current reception timing b1 of another already connected user is larger than a predetermined threshold value α, and the predicted reception timing Y of the new user and other already connected Only when it is determined that the difference from the user's current reception timing b2 is greater than the predetermined threshold value α, the mobile user and these other connected users are not in a close relationship and the mobile user is allowed to move. Also, it is determined that there is no problem in separation of multiple users.
[0122]
If even one of the above two conditions is not satisfied, it is determined that the predicted reception timing of the mobile user and the current reception timing of these other already connected users are close to each other, and the transmission timing shift of the mobile user Is not allowed.
[0123]
Next, it is determined whether or not the mobile station's predicted base station reception timing is in the base station receivable window area defined for each time slot. That is, even if the proximity determination with other connected users is cleared, if the predicted reception timing Y itself deviates from the receivable window of the slot, it cannot be received.
[0124]
Specifically, when the predicted base station reception timing Y is larger than the minimum position of the base station receivable window and the predicted base station reception timing Y is smaller than the maximum position of the base station receivable window. If determined, the mobile user is finally permitted to move within the slot.
[0125]
FIG. 8 is a flowchart showing the basic processing of the transmission channel allocation method according to the second embodiment of the present invention as described above. This processing is executed by software by the DSP 14 in FIG.
[0126]
First, in step S41, when a movement request for an already connected user is generated due to disconnection or the like, the processing according to the second embodiment starts.
[0127]
In step S42, the movement amount X of the transmission timing is calculated by taking the difference between the current transmission timing of the mobile user and the predicted transmission timing after the movement by the method described above.
[0128]
Next, in step S43, the base station reception timing Y after the movement is predicted by adding the transmission timing movement amount X to the current base station reception timing Z of the mobile user.
[0129]
In step S44, it is determined whether or not the differences between the predicted reception timing and the reception timings of other existing users are all greater than the threshold value α. If there is even one other existing user whose difference is smaller than the threshold value α, the process proceeds to step S47, and the movement of the transmission timing is rejected.
[0130]
On the other hand, if it is determined in step S44 that all the differences between the predicted reception timing and the reception timings of other existing users are greater than the threshold value α, the process proceeds to step S45.
[0131]
In step S45, it is determined whether or not the predicted base station reception timing of the mobile user is within the receivable window of the base station. If it is determined that it has not been received, the process proceeds to step S47, and the movement of the transmission timing is rejected.
[0132]
On the other hand, if it is determined in step S45 that the predicted base station reception timing of the mobile user is within the receivable window of the base station, the process proceeds to step S46, and the movement of the transmission timing is permitted. Become.
[0133]
As described above, according to the second embodiment of the present invention, the base station reception timing after the movement when the movement of the already connected user is requested due to disconnection or the like is actually predicted, and the bases of other already connected users are Since the movement is permitted after the proximity determination with the station reception timing is performed, it is possible to prevent the deterioration of the call characteristics and the user interference after the movement of the mobile user.
[0134]
The embodiment disclosed this time should be considered as illustrative in all points and not restrictive. The scope of the present invention is defined by the terms of the claims, rather than the description above, and is intended to include any modifications within the scope and meaning equivalent to the terms of the claims.
[0135]
【The invention's effect】
As described above, according to the present invention, when a path multiplexing state change is required, such as a connection request for a new user or a disconnection of an already connected user, the base station reception timing of the multiplexed user after the change is predicted and predicted. The change of the multiplexing state is executed only when a predetermined condition that does not reduce the reception timing difference among the multiplexed users is satisfied. However, it is possible to prevent the deterioration of the call characteristics and the interference between users after the change.
[Brief description of the drawings]
FIG. 1 is a functional block diagram showing an overall configuration of a base station according to the present invention.
FIG. 2 is a timing chart for explaining a basic operation principle of a first example of a transmission timing control method as a premise of the present invention;
FIG. 3 is a flowchart showing basic processing of the transmission timing control method shown in FIG. 2;
FIG. 4 is a timing diagram showing a procedure of transmission timing control when up to four multiplexing is possible in the first example of the transmission timing control method;
FIG. 5 is a timing chart for explaining a basic operation principle of a second example of the transmission timing control method as a premise of the present invention;
6 is a flowchart showing basic processing of the transmission timing control method shown in FIG. 5. FIG.
FIG. 7 is a flowchart showing basic processing of a transmission channel assignment method according to Embodiment 1 of the present invention;
FIG. 8 is a flowchart showing basic processing of a transmission channel assignment method according to Embodiment 2 of the present invention;
FIG. 9 is a timing chart for explaining a problem of the transmission timing control method.
[Explanation of symbols]
1, 2, 3, 4 Antenna, 5, 6, 7, 8 Transmission / reception circuit, 5a, 6a, 7a, 8a RF circuit, 9, 10, 11, 12 A / D and D / A converter, 13 Circulator, 14 DSP, 15 reception processing unit, 15a synchronization processing unit, 15b synchronization window control unit, 15c adaptive array processing unit, 15d detection unit, 16 transmission processing unit, 16a modulation processing unit, 16b, 16c multiplier, 16d transmission timing control unit, 16e Transmission signal composition processing unit, 17 control unit.

Claims (18)

A wireless base device capable of path multiplex connection of a plurality of mobile terminal devices,
If there is a mobile terminal apparatus to be newly path multiple access within a certain time slot, all of the mobile terminal the new path multiplexing as signal timing transmission are separated from each other for the device to pass multiple access after a new connection in the time slot Transmission timing moving means for moving the transmission timing for the mobile terminal device to be connected;
A reception timing prediction means for predicting the reception timing when the transmission timing of the mobile terminal apparatus to be newly connected to the path is moved;
Whether the predicted reception timing of the mobile terminal device to be newly connected to the path is newly separated from each reception timing from other mobile terminal devices already connected to the time slot by a predetermined value or more. Timing determination means for determining whether or not,
Receivability determining means for determining whether or not the predicted reception timing of the mobile terminal device to be newly connected to the path is within a receivable window of the time slot of the radio base device;
When it is determined by the timing determination means that the distance is not more than the predetermined value, or when it is determined by the receivability determination means that it does not fall within the receivable window, the mobile terminal newly trying to make a path multiplex connection A wireless base apparatus comprising: a connection prohibiting unit that prohibits connection of the apparatus to the time slot. The reception timing prediction means includes
Means for calculating a time difference between a transmission timing before connection to the time slot of the mobile terminal device to be newly connected by path multiplex connection and a transmission timing predicted when the transmission timing is moved;
And means for calculating the reception timing is the predicted by adding the time difference to the reception timing of the previous connection to the new the time slot of the mobile terminal apparatus to be pass multiple access, according to claim 1 Wireless base equipment. The radio base apparatus according to claim 1 or 2 , wherein the mobile terminal apparatus newly trying to perform path multiplex connection is a mobile terminal apparatus newly attempting to perform path multiplex connection to the radio base apparatus. Mobile terminal apparatus to be the path multiple access to the new is a mobile terminal apparatus to be newly path multiple access to the radio base device other time slots from the time slot, to claim 1 or 2 The wireless base device described. A wireless base device capable of path multiplex connection of a plurality of mobile terminal devices,
If there is a mobile terminal device that is to be disconnected from a plurality of mobile terminal devices that have already been path-multiplexed within a time slot, all of the remaining mobile terminal devices that continue to be path-multiplexed after disconnection in that time slot a transmission timing moving means for signal timing transmission moves at least the transmission timing for one of the remaining mobile terminal devices away from each other with respect,
Reception timing prediction means for predicting the reception timing when the transmission timing of at least one of the mobile terminal devices is moved;
It is determined whether or not the predicted reception timing of the at least one mobile terminal apparatus is more than a predetermined value from each of reception timings from other mobile terminal apparatuses that are path-multiplex connected to the time slot. Timing determination means;
Receivability determining means for determining whether or not the predicted reception timing of the at least one mobile terminal apparatus falls within a receivable window of the time slot of the radio base apparatus;
When it is determined by the timing determining means that the distance is not more than the predetermined value, or when it is determined by the receivability determining means that it does not fall within the receivable window, the transmission timing is moved by the transmission timing moving means. A radio base apparatus comprising a movement prohibition means for prohibiting. The reception timing prediction means includes
Means for calculating a time difference between a transmission timing before movement of the at least one mobile terminal device and a transmission timing predicted when the transmission timing is moved;
The radio base apparatus according to claim 5 , further comprising: means for calculating the predicted reception timing by adding the time difference to a reception timing before movement of the at least one mobile terminal apparatus. A transmission channel assignment method in a radio base device capable of path multiplex connection of a plurality of mobile terminal devices,
If there is a mobile terminal apparatus to be newly path multiple access within a certain time slot, all of the mobile terminal the new path multiplexing as signal timing transmission are separated from each other for the device to pass multiple access after a new connection in the time slot Moving the transmission timing for the mobile terminal device to be connected;
Predicting the reception timing when the transmission timing of the mobile terminal device to be newly connected to the path is moved;
Whether the predicted reception timing of the mobile terminal device to be newly connected to the path is newly separated from each reception timing from other mobile terminal devices already connected to the time slot by a predetermined value or more. Determining whether or not,
Determining whether or not the predicted reception timing of the mobile terminal device to be newly connected to the path is within a receivable window of the time slot of the radio base device;
When it is determined that the distance is not more than the predetermined value, or when it is determined that it does not fall within the receivable window, the connection to the time slot of the mobile terminal device to be newly connected by path multiplexing is prohibited. A transmission channel assignment method comprising the steps of: Predicting the reception timing includes:
Calculating a time difference between a transmission timing before connection to the time slot of the mobile terminal device to be newly connected to the time slot and a transmission timing predicted when the transmission timing is moved;
And calculating the reception timing is the predicted by adding the time difference to the reception timing of the previous connection to the time slot of the mobile terminal apparatus to be the path multiple access to the new claim 7 Transmission channel assignment method. The transmission channel assignment method according to claim 7 or 8 , wherein the mobile terminal apparatus newly trying to make a path multiplex connection is a mobile terminal apparatus newly making a path multiplex connection to the radio base apparatus. The new mobile terminal apparatus to be path multiplex connection is a mobile terminal apparatus to be newly path multiple access to the radio base device other time slots from the time slot, to claim 7 or 8 The transmission channel allocation method as described. A transmission channel assignment method in a radio base device capable of path multiplex connection of a plurality of mobile terminal devices,
If there is a mobile terminal device that is to be disconnected from a plurality of mobile terminal devices that have already been path-multiplexed within a time slot, all of the remaining mobile terminal devices that continue to be path-multiplexed after disconnection in that time slot a step signal timing transmission for moves at least the transmission timing for one of the remaining mobile terminal devices away from each other,
Predicting the reception timing when the transmission timing of at least one of the mobile terminal devices is moved; and
It is determined whether or not the predicted reception timing of the at least one mobile terminal apparatus is more than a predetermined value from each of reception timings from other mobile terminal apparatuses that are path-multiplex connected to the time slot. Steps,
Determining whether the predicted reception timing of the at least one mobile terminal device falls within a reception window of the time slot of the radio base device; and
A transmission channel allocating method comprising: prohibiting movement of the transmission timing when it is determined that the distance is not greater than the predetermined value or when it is determined that the distance does not fall within the receivable window. Predicting the reception timing includes:
Calculating a time difference between a transmission timing before movement of the at least one mobile terminal device and a transmission timing predicted when the transmission timing is moved;
And calculating the reception timing is the predicted by adding the time difference to the reception timing before the movement of the at least one mobile terminal device, the transmission channel allocation method according to claim 1 1. A transmission channel allocation program in a radio base device capable of path multiplex connection of a plurality of mobile terminal devices, comprising:
If there is a mobile terminal apparatus to be newly path multiple access within a certain time slot, all of the mobile terminal the new path multiplexing as signal timing transmission are separated from each other for the device to pass multiple access after a new connection in the time slot Moving the transmission timing for the mobile terminal device to be connected;
Predicting the reception timing when the transmission timing of the mobile terminal device to be newly connected to the path is moved;
Whether the predicted reception timing of the mobile terminal device to be newly connected to the path is newly separated from each reception timing from other mobile terminal devices already connected to the time slot by a predetermined value or more. Determining whether or not,
Determining whether or not the predicted reception timing of the mobile terminal device to be newly connected to the path is within a receivable window of the time slot of the radio base device;
When it is determined that the distance is not more than the predetermined value or when it is determined that the distance does not fall within the receivable window, connection to the time slot of the mobile terminal device to be newly connected by path multiplexing is prohibited. A transmission channel assignment program for executing the steps. Predicting the reception timing includes:
Calculating a time difference between a transmission timing before connection to the time slot of the mobile terminal device to be newly connected to the time slot and a transmission timing predicted when the transmission timing is moved;
And calculating the reception timing is the predicted by adding the time difference to the reception timing of the previous connection to the time slot of the mobile terminal apparatus to be the path multiple access to the new, to claim 1 3 The transmission channel assignment program described. The new mobile terminal apparatus to be path multiplex connection is a mobile terminal apparatus to be newly path multiple access to the radio base apparatus, transmission channel allocation program according to claim 1 3 or 14. The new mobile terminal apparatus to be path multiplex connection is a mobile terminal apparatus to be newly path multiple access to the radio base device other time slots from the time slot, according to claim 1 3 or 14 The transmission channel assignment program described in 1. A transmission channel allocation program in a radio base device capable of path multiplex connection of a plurality of mobile terminal devices, comprising:
If there is a mobile terminal device that is to be disconnected from a plurality of mobile terminal devices that have already been path-multiplexed within a time slot, all of the remaining mobile terminal devices that continue to be path-multiplexed after disconnection in that time slot a step signal timing transmission for moves at least the transmission timing for one of the remaining mobile terminal devices away from each other,
Predicting the reception timing when the transmission timing of at least one of the mobile terminal devices is moved; and
It is determined whether or not the predicted reception timing of the at least one mobile terminal apparatus is more than a predetermined value from each of reception timings from other mobile terminal apparatuses that are path-multiplex connected to the time slot. Steps,
Determining whether the predicted reception timing of the at least one mobile terminal device falls within a reception window of the time slot of the radio base device; and
A transmission channel assignment program that executes a step of prohibiting movement of the transmission timing when it is determined that the distance is not more than the predetermined value or when it is determined that the distance does not fall within the receivable window. Predicting the reception timing includes:
Calculating a time difference between a transmission timing before movement of the at least one mobile terminal device and a transmission timing predicted when the transmission timing is moved;
The transmission channel allocation program according to claim 17 , further comprising: calculating the predicted reception timing by adding the time difference to the reception timing before movement of the at least one mobile terminal apparatus.

Images