JP2845835B2 - Mobile communication system - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a mobile communication system, and more particularly to a response signal (hereinafter referred to as an ACK signal) from a mobile communication base station to a mobile terminal in response to a call signal from the mobile terminal to the mobile communication base station. Acknowledge signal) control.

[0002]

2. Description of the Related Art In a mobile communication system, a downlink control channel transmitted from a radio base station to each mobile terminal is a terminating channel, which is constituted by a terminating slot divided by unit time. This arrival slot is a broadcast signal used when it is desired to simultaneously notify the information of the radio base station to a plurality of mobile stations, and an individual signal used when a plurality of mobile stations are controlled in a cell unit as one group. It comprises a cell signal and an incoming signal when another terminal calls a mobile terminal via the radio base station.

In a mobile communication system using this incoming slot, the incoming channel has the incoming slot numbered as'
When divided into 0 'to' n '(n is a natural number), these incoming slots are time-divisionally transmitted, starting from the incoming slot number' 0 'and reaching the number' n ', Returning to '0', the slot transmission operation is repeated. This incoming slot is used for an ACK from the radio base station to the mobile terminal for a call signal from the mobile terminal to the radio base station.
It also has a signal.

[0004] A mobile terminal receives an incoming slot by intermittent reception or non-intermittent reception. Intermittent reception means that the mobile terminal receives only the incoming slot including its own identification code in order to reduce the driving current of the mobile terminal. The period of the intermittent reception of the incoming slot is different for each mobile terminal, that is, a mobile terminal that receives once on one incoming channel, a mobile terminal that receives once on two incoming channels,. There are mobile terminals that receive once on n incoming channels.

[0005] The cycle of intermittent reception can be selected in consideration of the frequency of incoming calls of the user, power consumption during reception waiting time, and the like. When the radio base station transmits an incoming signal to a specific mobile terminal using an incoming slot, the radio base station determines from which incoming slot number in which cycle the intermittent reception is performed, and determines the corresponding incoming slot. Select to send the incoming signal.

[0006] Non-intermittent reception is mainly used by a mobile terminal mounted on a vehicle that does not consider power consumption. in this case,
A mobile terminal transmits a call signal as a communication request for receiving an incoming slot and a position registration signal for notifying its position to the radio base station (hereinafter referred to as MS signal: call and position registration signal).
Immediately after the transmission of the
This is performed during the waiting time until the K signal returns.

[0007]

By the way, in the conventional mobile communication system, there is a limit on the waiting time of the ACK signal at the mobile terminal with respect to the call signal, and the radio base station receives the MS signal from the mobile terminal. It is necessary to transmit an ACK signal to the mobile terminal within this waiting time. Then, after the transmission of the call signal, the mobile terminal has to perform the operation of retransmitting the MS signal when the ACK signal is not transmitted from the radio base station even after the waiting time of the ACK signal has passed.

Further, when the traffic of the incoming slot increases, the incoming signal and the ACK signal are mixed in the incoming slot, so that the number of incoming signals that can be transmitted in the incoming slot is limited, and the incoming signal to be transmitted is transmitted to the radio base station. At the bureau,
There was a problem of being kept on hold. The present invention has been made under such a background, and a wireless base station returns an ACK signal without exceeding an ACK signal waiting time of a mobile terminal, and cannot reserve an incoming signal from the wireless base station to the mobile terminal. It is an object of the present invention to provide a mobile communication system capable of transmitting.

[0009]

According to the first aspect of the present invention,
In a mobile communication system, provided in a mobile communication radio base station that communicates with a plurality of mobile terminals and a plurality of fixed terminals, extracting identification information of the mobile terminal from an output signal output from the mobile terminal Means, temporarily storing the identification information, and first time data indicating a margin time from when the output signal is input to the mobile communication radio base station to when a response signal is transmitted to the mobile terminal. First temporary storage means, from the plurality of mobile terminals or the plurality of fixed terminals, a second temporary storage means for temporarily storing a request signal requesting communication with the mobile terminal, From the first time data stored in one temporary storage means and the presence or absence of the request signal in the second temporary storage means, priority is given to output the response signal and the request signal to the mobile terminal. Determination means for determining the position, characterized by comprising an output means for outputting the response signal and the request signal to the mobile terminal in order of priority by the determination means.

According to a second aspect of the present invention, in the mobile communication system according to the first aspect, the determining means determines whether the first time data is '0' or more than '0',
When the first time data is '0', the output means outputs the response signal to the mobile terminal. The invention according to claim 3 is the mobile communication system according to claim 1 or 2, wherein the determination means determines whether the first time data is '0' or exceeds '0', and Time data exceeds '0' and '1'
As described above, when the request signal is present in the second temporary storage means, the output means outputs the request signal to the mobile terminal. According to a fourth aspect of the present invention, in the mobile communication system according to any one of the first to third aspects, the mobile communication system further includes an arithmetic unit that stores an arithmetic result in a first temporary storage unit, wherein the arithmetic unit includes The first time data is obtained from second time data indicating a predetermined time for each mobile terminal and the cycle of the response signal. The invention according to claim 5 is
In the mobile communication system according to claim 4, the second time data, the mobile terminal in order to make the mobile terminal in communication with another terminal, after the mobile terminal outputs the output signal to the radio base station, It is a set time until the mobile terminal receives the response signal in a communication-ready state.

[0011]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a block diagram showing a configuration of a mobile communication system according to an embodiment of the present invention.
In this figure, reference numeral 1 denotes a radio control unit provided in a radio base station, which transmits and receives signals by an antenna 2, and performs one-to-one communication of a plurality of mobile terminals 3,. The communication between the mobile terminals 3,..., And the fixed terminal 7 whose line is controlled by the line controller 6 provided at the telephone station connected via the transmission lines 4 and 5 is controlled. 10
Is an incoming slot selection unit, which extracts the incoming slot number of the incoming signal for the mobile terminal 3 received from the line control unit 6 and is registered in advance in the incoming slot table prepared for each incoming slot in the table storage unit 11. The identification code of the mobile terminal 3 is written in the area where the mobile terminal 3 is located.

A transmission processing unit 12 is activated at the transmission timing of the incoming slot, inserts an incoming signal and an ACK signal for a call signal from the mobile terminal 3 into the incoming slot, and transmits it to the radio unit 14. I do. The wireless device 14 outputs the incoming slot transmitted from the transmission processing unit 12 from the antenna 2, further receives a call signal from the mobile terminal 3, and transmits it to the storage table control unit 15. The storage table control unit 15 extracts the identification code of the mobile terminal 3 from the outgoing call signal sent from the wireless device 14 and stores it in the table storage unit 1.
3 is stored in a pending ACK storage table prepared for each incoming slot.

Next, FIG. 2 showing a pending ACK storage table stored in the table storage unit 13 in FIG. 1 will be described. In this figure, reference numeral 20 denotes a storage area in which the number of ACK signals currently reserved is stored. 21
0 to 21n (0 to n are natural numbers) are storage areas, each of which stores an ACK transmission time 25 and an area 2 which stores an identification code of the mobile terminal 3 in which an ACK signal is held.
6 is stored.

[0014] The ACK transmission time represents the time from when the MS signal of the corresponding mobile terminal is received to a predetermined ACK waiting time of the mobile terminal. The storage table control unit 15 determines the M of the mobile terminal 3 from the ACK signal waiting time-out time T1 and the arrival slot time T2.
The ACK transmission time T3 for the S signal is obtained from the equation T3 = (T2 / T1) -1, and the ACK transmission time T3 is written in the pending ACK storage table together with the identification code of the mobile terminal 3 as the mobile terminal. In this equation, “−l” is defined as ACK
This is because the incoming slot that returns a signal is transmitted in the immediately preceding incoming slot that expires.

Next, the operation of the embodiment of the present invention will be described with reference to FIGS. 1 and 2 and the flowcharts of FIGS. 3 and 4. First, when the mobile terminal 3 is called from the fixed terminal 7, the number of the reception slot intermittently received by the mobile terminal 3 and the reception information carrying the identification code of the mobile terminal are transmitted from the line control unit 6 to the wireless control unit 1. Can be Next, the incoming slot selection unit 10 extracts the number of the incoming slot in the incoming signal and writes the mobile terminal identification code specified by the incoming signal into the incoming slot table area of the table storage unit 11.

On the other hand, the mobile terminal 3 transmits an MS signal to the radio base station. Then, the MS signal received by the wireless control unit 1 in the wireless base station is transferred to the storage table control unit 15 via the antenna 2 and the wireless device 14. Next, in step S1 of FIG. 3, the storage table control unit 15 receives the MS signal. Next, in step S2, the storage table control unit 15 calculates the ACK transmission time T3 for the mobile terminal 3 from the predetermined waiting time T2 of the ACK signal in the mobile terminal 3. Next, in step S3, the storage table control unit 15 compares the calculated ACK transmission time T3 with the pending ACK of the storage table 13.
Write to the storage table area.

Next, in step S10 of FIG. 4, the transmission processing unit 12 is started at the transmission timing of the incoming slot, and searches for the ACK transmission time T3 in the pending ACK storage table. At this time, the ACK transmission time is '0'
If the mobile terminal 3 is confirmed, the time corresponding to one incoming slot is reached until the ACK waiting time of the mobile terminal 3 expires.
Inserts the ACK signal for the corresponding mobile terminal 3 into the incoming slot, and deletes the identification code of the mobile terminal 3 and the ACK transmission time T3 from the pending ACK storage table.

The transmission processing unit 12 operates in step S11 until the mobile terminal 3 whose ACK transmission time is “0” is not confirmed in the pending ACK storage table or until the data length of one incoming slot becomes transmittable. repeat. In step S10, the search for the ACK transmission time T3 in the pending ACK storage table indicates that the
If the mobile terminal 3 whose K transmission time is '0' is not confirmed, step S11 is not executed and step S12 is not executed.
Proceed to.

Next, in step S12, the transmission processing unit 12 checks whether there is room to insert an incoming signal in the incoming slot into which the ACK signal has been inserted. Next, if there is room in the incoming slot in step S12, the area of the number of the incoming slot currently being processed is searched from the incoming slot table, and the identification code of the mobile terminal 3 indicated in this area is replaced with the incoming slot. Insert And
The transmission processing unit 12 repeats the operation of step S13 until all the incoming signals for the corresponding mobile terminal 3 are inserted into the incoming slot table or the incoming slot has a transmittable data length. Also, in step S12, when it is confirmed that there is no room in the incoming slot,
Step S13 is not executed, and the process proceeds to step S14.

Next, in step S14, the transmission processing unit 12 checks whether or not there is room for inserting an ACK signal in the incoming slot in which the incoming signal has been inserted. If it is determined in step S14 that the incoming slot has a margin, in step S15, the transmission processing unit 12 determines whether the AC slot remaining in the pending ACK storage table
The ACK signal to be sent to the mobile terminal 3 that needs to send the K signal is inserted into the receiving slot, and the identification code of the mobile terminal 3 and the ACK transmission time T3 are deleted from the pending ACK storage table.

Then, the transmission processing unit 12 repeats the operation of step S15 until all remaining ACK signals for the mobile terminal 3 are inserted in the pending ACK storage table or until the incoming slot has a transmittable data length. If it is determined in step S14 that there is no room in the incoming slot, step S15 is not executed, and the process proceeds to step S16. Next, step S16
In, the transmission processing unit 12 transmits the incoming slot to the wireless device 14 and, at this time, the AC of the mobile terminal 3 which needs to send the ACK signal remaining in the pending ACK storage table.
“1” is subtracted from the K transmission time, and the operation ends. Then, the above-described operation is repeated at the transmission timing of the next incoming slot.

Next, using specific numerical values, the transmission processing unit 1
2 and the operation of the storage table controller 15 will be described with reference to FIGS. 1 and 5 and the timing charts of FIGS. FIG. 5A shows an uplink control channel 30.
Is shown. The uplink control channel 30 includes uplink control slots 31 to 38. FIG. 5 (b)
Indicates an incoming channel 40. The receiving channel 40 includes receiving slots 41 to 47.

First, the time width of each slot of the uplink control channel and the terminating channel in this mobile communication system is 10 ms, and A
The CK waiting time is 70 ms. The uplink control channel is
This is a signal to the radio base station for the mobile terminal 3 to transmit the MS signal. Here, the transmittable data amount in one incoming slot is eight signals.

The incoming signal transmitted from the line control section 6 to the incoming slot control section 10 in the radio base station refers to the incoming slot number in the incoming signal and corresponds to the incoming slot table prepared for each incoming slot. Is written to the corresponding slot number area. Here, in the area corresponding to the incoming slots 41 to 46 in the incoming slot table, the number of incoming signals is 8, and the transmittable data amount in one incoming slot has already been reached. The number of signals is 1 signal.
Then, the mobile terminal 3 adds M to its own identification code.
It is assumed that the S signal is transmitted in the uplink control slot 31.

In step S1, the MS signal transmitted by the uplink control slot 31 is transmitted to the antenna 2
Then, it is sent to the storage table control unit 15 via the wireless device 14. Next, in step S2, the storage table control unit 15 determines from the timing of the uplink control slot 31
The number of slots until the ACK signal waiting time is calculated as the ACK transmission time T3. The equation in this case is shown below: T3 = (70 ms / 10 ms) -1 Then, in step S3, the storage table control unit 1
5 is the identification code of the mobile terminal 3 described in the MS signal and the ACK transmission time T3 ('
6 ') is written to the pending ACK storage table.

In step S10, the transmission processing unit 12 is activated at the timing of the incoming slot, and
Search in the CK storage table. At this time, the pending ACK
The storage table stores the ACK transmission time of the mobile terminal 3 and the identification code of the mobile terminal 3. Here, in step 3, the storage table control unit 15 causes the pending ACK
Since the ACK transmission time written in the storage table is '6', step S11 is not executed, and no ACK signal is inserted into the incoming slot.

Next, in step S12, the transmission processing unit 12 checks whether there is room to insert an incoming signal. At this time, since the ACK signal has not been inserted, the transmission processing unit 12
Refers to an area where the identification code of the mobile terminal that needs to send the incoming signal in the incoming slot 41 in the incoming slot table is stored, and “8” corresponding to the identification code of the mobile terminal 3 in this area is referred to. To create an incoming slot.

Then, in step S14, the transmission processing unit 12 checks whether there is room to insert an ACK signal in the incoming slot 41. However, there is no room to insert "8" incoming signals already. Is confirmed,
No ACK signal is inserted into the incoming slot 41 in step S15. Next, in step S16, the transmission processing unit 12 subtracts “1” from the ACK transmission time T3 indicated in the area 25 of the pending ACK storage table, so that the ACK transmission time T3 of the mobile terminal 3 becomes “5”. Becomes Then, the operation at the timing of the incoming slot 41 ends.

Further, the transmission processing section 12 is activated at the timing of the incoming slot, and the above-described operation is repeated.
For example, if the processing started at the timing of the incoming slot 42 is to be terminated, the AC
The ACK transmission time T3 of the K signal is '4'. That is, there is '8' incoming data inserted into each of the incoming slots 41 to 46, and there is no room in the amount of transmitted data, so the ACK transmission time T3 is one cycle of one incoming slot.
Since it is decreased by '1' every 0 ms, the incoming slot 46
A when the operation of the transmission processing unit 12 started in
The CT transmission time T3 is “0”.

Then, the transmission processing unit 12 is activated at the timing of the reception slot 47, and in step S10, the transmission processing unit 12 checks the pending ACK storage table. Here, the transmission processing unit 12 sets the ACK transmission time T3 of the ACK signal for the uplink control slot 31 to “0”.
Is confirmed in step S11.
The CK signal is inserted into the receiving slot 47. Then, the transmission processing unit 12 deletes the identification code of the mobile terminal 3 that has transmitted the ACK signal and the ACK transmission time T3 in the pending ACK storage table.

Next, in step S12, since only one ACK signal is contained in the incoming slot 47, the transmission processing unit 12 confirms that there is room in the transmission data. Then, in step S14, the transmission processing unit 12 sets the incoming slot 47 in the incoming slot table to
Is inserted into the incoming slot 47 of the incoming signal of the mobile terminal 3 corresponding to.

Next, in step S14, the transmission processing unit 12 checks whether or not the incoming slot 47 has room for transmission data. At this point, the incoming slot includes “2” of the ACK signal “1” and the incoming signal “1”.
'Signal data has been inserted, so step S1
In 5, the transmission processing unit 12 inserts an ACK signal into the incoming slot 47 as long as the transmission data in the incoming slot 47 has room or as long as there is an ACK signal in the pending ACK storage table. Next, in step S16,
The transmission processing unit 12 checks the A
'1' is subtracted from the CK transmission time T3. Then, the operation of the transmission processing unit 12 started at the timing of the incoming slot 47 ends.

[0033]

According to the present invention, in a mobile communication system, a mobile communication base station for communicating with a plurality of mobile terminals and a plurality of fixed terminals receives the mobile signal from an output signal output from the mobile terminal. Extracting means for extracting terminal identification information, the identification information, and a first time indicating a time from when the mobile communication radio base station receives the output signal to when a response signal is sent to the mobile terminal. First temporary storage means for temporarily storing data, and for temporarily storing a request signal for requesting communication with the mobile terminal, from the plurality of mobile terminals or the plurality of fixed terminals. Second temporary storage means, from the presence or absence of the request signal in the first time data and the second temporary storage means stored in the first temporary storage means, the response signal to the mobile terminal and Previous Judging means for judging the priority of outputting the request signal, and output means for outputting the response signal and the request signal to the mobile terminal in the order of the priority by this judging means, provided from the mobile terminal The re-output operation of the output signal due to the increase in the response time to the output signal is lessened, and the effect of preventing the occurrence of a mobile terminal that cannot receive the incoming signal from another terminal can be obtained.

Further, according to the present invention, in the mobile communication system, there is provided a calculating means for storing a calculation result in the first temporary storage means, wherein the calculating means is predetermined for each of the plurality of mobile terminals. From the second time and the cycle of the response signal, to determine the first time until the response signal is output by the output means, the timing at which the output means outputs the response signal is accurately determined. There is an effect that means can be determined. Further, according to the present invention, in the mobile communication system, the second time data, the mobile terminal is in a communication state with another terminal, the mobile terminal outputs the output signal to the radio base station Since the set time until the mobile terminal receives the response signal while waiting for communication with the mobile terminal, the first time data is calculated by obtaining the second time data for each mobile terminal. This has the effect that the judgment material of the judgment means can be created.

[Brief description of the drawings]

FIG. 1 is a block diagram illustrating a configuration of a mobile communication system according to an embodiment of the present invention.

FIG. 2 is a diagram showing a configuration of a pending ACK storage table used in the mobile communication system according to one embodiment of the present invention.

FIG. 3 is a flowchart of an operation of a storage table control unit in the mobile communication system according to one embodiment of the present invention.

FIG. 4 is a flowchart of an operation of a transmission processing unit in the mobile communication system according to one embodiment of the present invention.

FIG. 5 is a diagram illustrating slots used in a mobile communication system according to an embodiment of the present invention.

[Explanation of symbols]

 Reference Signs List 1 radio control unit 2 antenna 3 mobile terminal 4 transmission line 5 transmission line 6 line control unit 7 fixed terminal 10 incoming slot selection unit 11, 13 table storage unit 12 transmission processing unit 14 radio unit 15 storage table control unit 20 area 210 to 21n Area 25 Area 26 Area 30 Uplink control channel 31, 32, 33, 34 Uplink control slot 35, 36, 37, 38 Uplink control slot 40 Incoming channel 41, 42, 43, 44 Incoming slot 45, 46, 47 Incoming slot

Claims (5)

(57) [Claims] 1. An extraction for extracting identification information of the mobile terminal from an output signal output from the mobile terminal, which is provided in a mobile communication radio base station that communicates with a plurality of mobile terminals and a plurality of fixed terminals. Means, temporarily storing the identification information, and first time data indicating a margin time from when the output signal is input to the mobile communication radio base station to when a response signal is sent to the mobile terminal. First temporary storage means, from the plurality of mobile terminals or the plurality of fixed terminals,
Second temporary storage means for temporarily storing a request signal for requesting communication with the mobile terminal; first time data and the second temporary storage stored in the first temporary storage means Means for judging the priority of outputting the response signal and the request signal to the mobile terminal from the presence or absence of the request signal in the means; and the response signal and the response signal to the mobile terminal in the order of priority by the judgment means. Output means for outputting the request signal. 2. The determination means determines whether the first time data is “0” or exceeds “0”, and when the first time data is “0”, the output means The mobile communication system according to claim 1, wherein the response signal is output to the mobile terminal. 3. The determination means determines whether the first time data exceeds '0' or '0', and determines whether the first time data exceeds '0' and exceeds '1'. 3. The mobile communication system according to claim 1, wherein the output unit outputs the request signal to the mobile terminal when the request signal is present in the second temporary storage unit. 4. An operation means for storing an operation result in a first temporary storage means, the operation means comprising: second time data indicating a predetermined time for each of the plurality of mobile terminals; 4. The mobile communication system according to claim 1, wherein the first time data is obtained from a signal cycle. 5. The mobile station, after outputting the output signal to the radio base station, transmits the output signal to the radio base station in order for the second time data to make the mobile terminal communicate with another terminal. 5. The mobile communication system according to claim 4, wherein the mobile communication system is a set time until the response signal is received in a possible waiting state.