JP2000059327A - Tdma communication device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide the TDMA communication device where a desired operation can be executed without any hindrance even on the occurrence of use of a same time slot in the TDMA communication device in which communication is conducted through plural time slots simultaneously by switching operation of one frequency changeover circuit and to which a call identification relay function can be added. SOLUTION: A control section 3 is provided with a transmission reception priority discrimination section and stops either transmission reception of a communication channel with lower priority temporarily and executes communication through a channel with higher priority in the case that an adjacent or a same slot is in use as a communication channel operated simultaneously so that one frequency changeover circuit 2 can execute communication. In the case of executing as a repeater having a call identification relay function, communication with a PS(portable station) takes precedence over communication with a communication satellite CS (base station), the control section 3 selects a PS operating frequency and gives it to a radio section 1 and stops a signal for CS under the condition that a same slot is used for transmission reception of the communication with the CS and with the PS.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a communication apparatus using a TDMA system also used for digital radio communication such as PHS, and more particularly, to a frequency switching control system for simultaneous communication of a plurality of time slots (TS). The present invention relates to the TDMA communication device adopting the above.

[0002]

2. Description of the Related Art In a conventional radio communication system using a TDMA system, in a system using a specific frequency for each TS, a plurality of frequency switching circuits are provided for each TS in order to simultaneously access a plurality of TSs. It was responded by that. Here, such a conventional method will be described with reference to FIGS. FIG. 7 shows, at the top, a T which is generally used in TDMA communication.
Illustrates a TS configuration based on a DMA frame format,
In the lower part, the used frequency in a certain communication state is shown corresponding to the TS. In the example of FIG. 7, assuming that the number of time divisions is 4, the transmission section (TX) has four slots TS1 to TS4 and the reception section (RX) has four slots ts1 to ts4.

[0003] When simultaneous communication is performed using the frequency f1 on TS2 (ts2) and the frequency f2 on TS3 (ts3) in the TS configuration, the frequencies f1 and f2 are different on different slots. ts2) The frequency is changed from f1 to f2 from the end of the section to before the start of TS3 (ts3).
Need to switch to. However, as shown in FIG. 7, the relationship between TS2 and TS3 is adjacent slots, and it is technically difficult to perform frequency switching during this period. Therefore, conventionally, two systems of frequency switching circuits are prepared. FIG. 8 is a schematic block diagram of a conventional communication device configured using frequency switching circuits 1 and 2 prepared in two systems. In the apparatus shown in FIG. 8, two systems of frequency switching circuits 1 and 2 are provided in a generator 2 'of an oscillating wave supplied to a radio unit 1', and an oscillation signal of one of the circuits is supplied to a controller 3 '. Is selected by the selector 2's which is operated by the switching signal from. In this way, by switching and supplying the used frequency by the switching signal from the control unit 3 'for each TS, a stable frequency can be used in a plurality of slots and simultaneous communication can be performed. However, the conventional method shown in FIG. 8 requires a plurality of frequency switching circuits, which results in an increase in the size of the device, which in turn leads to an increase in cost.

On the other hand, in recent PHS systems and the like, a system is provided between a base station and a portable station, which has a function of relaying respective radio waves, and further has a repeater which realizes this with one frequency switching circuit. Has also appeared. In such a repeater, two radio channels are used between the base station and the portable station. Since the slots used by the two radio channels are constituted by a single frequency switching circuit of the repeater, In order to sufficiently secure the time required for frequency switching, communication with both stations is performed by using one or more slots apart from each other. However, since this repeater merely has a function of relaying a signal from a base station or a mobile station in a through manner, the position of the time slot to be used is assigned by the base station side between base stations. Accordingly, a slot position is also allocated between the repeater and the mobile station. That is, before executing the call connection procedure between the relay station and the base station, the slots used for the base station and the mobile station are allocated, so that the slot used for communication with the base station and the mobile station are used. The slot can be operated in such a manner that one or more slot positions are maintained in both the operation using the control channel and the operation using the communication channel. Even with the switching circuit, it is possible to sufficiently secure the time required for frequency switching, and there is no operational problem.

[0005]

However, a relay having a function of relaying by operating a single frequency switching circuit, but having a function of relaying a signal through the base station depending on the base station. In contrast, after the repeater identifies the call of the terminal (ie, after performing the call connection sequence required to determine the type of call between the base station and the repeater), And a call connection procedure that establishes a link and performs a call connection procedure, and has a function equivalent to that of the base station, and can be called a call identification repeater that enables communication with the identified call. Considering the operation of this repeater, the communication procedure up to the call connection sequence performed between the base station and the repeater by the base station-initiated channel allocation and the link allocation procedure performed between the repeater and the terminal using the control channel are performed simultaneously. In some cases, adjacent slots or the same slot may be used temporarily, and at this time, a problem that a signal of a control channel is lost occurs. The present invention has been made in view of the above problems in the prior art or the prior art,
In the above-described TDMA communication apparatus having one frequency switching circuit operated and having a call identification relay function,
The TDMA having means for enabling execution of a desired communication operation without any trouble even when the same slot is used.
It is an object to provide a communication device.

[0006]

As a technical means for realizing the above-mentioned object, in the present invention, means for performing transmission / reception priority determination is provided in a control unit, and adjacent or identical slots are used as communication channels operated simultaneously. In this case, the transmission and reception of either one of the lower priority is temporarily stopped, and communication is performed with the higher priority, whereby 1
The communication can be performed by the two frequency switching circuits.

[0007] The invention of each claim constitutes the following means. According to a first aspect of the present invention, there is provided a TDMA system for transmitting and receiving communication data formed on two or more communication channels in accordance with a TDMA data frame format including a predetermined number of time slots using a frequency set corresponding to each communication channel.
A DMA communication device, wherein the operation of a frequency switching circuit that switches the frequency set as a frequency used in a transmission / reception unit corresponding to each communication channel is performed by sufficiently separating time slots used in each communication channel in time. Control is performed so that the time required for switching to the frequency set corresponding to each communication channel has a margin, and in the communication conditions where time slots used in each communication channel cannot be sufficiently separated in time, predetermined The priority of transmission / reception between communication channels is determined according to the determined priority determination logic, and control is performed so as to switch to a frequency of a communication channel having a higher priority, and control is performed to stop transmission / reception of a communication channel having a lower priority. And a control unit that performs the control.

According to a second aspect of the present invention, there is provided the TDM according to the first aspect.
In the communication device A, the switching operation of the frequency switching circuit is performed by allocating a communication link with the communication device set by the public base station and completing a call connection sequence with the base station, and obtaining a call. The present invention is characterized in that the communication is performed in accordance with the assignment of a communication link with a terminal station set by the present communication apparatus based on the identification result, and the present communication apparatus is operated as a call identification repeater.

According to a third aspect of the present invention, in the TDMA communication apparatus according to the first or second aspect, a higher priority is set for a downstream communication channel as the priority determination logic.

According to a fourth aspect of the present invention, in the TDMA communication apparatus according to the first or third aspect, the communication channel is a wireless channel.

[0011]

Embodiments of the present invention will be described below with reference to the accompanying drawings. FIG. 1 is a schematic block diagram showing an embodiment of a TDMA communication apparatus according to the present invention which is configured using one frequency switching circuit. In the apparatus shown in FIG. 1, a single-system frequency switching circuit is provided in a generator 2 for generating an oscillating wave to be supplied to a radio unit 1, and a switching signal from a control unit 3, for example, a frequency switching for a mobile station (PS) communication The frequency switching circuit is operated by the signal (C1) or the frequency switching signal (C2) for communication with the base station (CS) to generate an oscillation signal having a frequency used in accordance with the TS of the communication channel, and to supply the oscillation signal to the radio unit. Enables communication. As shown in FIG. 1, a transmission / reception priority determination unit is provided in the control unit 3, and when a communication condition such that a transmission / reception signal occurs in the same time slot occurs, which signal is used with priority. The operation is controlled in accordance with the result of this determination. The details of such an operation will be clarified in the description of the operation sequence of the example described later, which further embodies this embodiment.

FIG. 2 (part 1) and FIG. 3 (part 2) are diagrams showing an example of a communication sequence when a repeater is configured as an embodiment of the TDMA communication apparatus according to the present invention. In FIG. 2 and FIG. 3, the time progresses from the top to the bottom of the figure, and the transmission of the base station and the mobile station,
The received signal (eg, (S1), (S2)...) Is indicated by ↑, and the meaning of the signal is indicated by adding to ↑. In addition, a transmission / reception time slot number as an operating condition of the repeater (eg,
R1, T3, where R1: first reception slot, T3:
Third transmission slot) and frequency type symbol (eg, fa, f
2) is shown at the top and bottom of the frame, respectively. The operation of the repeater of this embodiment will be described with reference to the communication sequence of FIG. The explanation of this operation is as follows.
Operations in three sections B and C (sections A, B, and C are also shown on the right end of FIGS. 2 and 3 in FIGS. 2 and 3) will be separately described. The operations in the sequence of the sections A, B, and C correspond to the time charts showing the use state of the TS and the switching operation shown in FIGS. 4, 5, and 6, respectively.

A communication sequence in section A (see FIG. 4) The repeater first receives a control signal (S1) by a control channel from a base station (hereinafter, referred to as CS) at “TS position R1 frequency f1”. The repeater that has received this control signal (S1) then sends a control signal (S2) by a control channel to a mobile station (hereinafter, referred to as PS) in this example,
Transmission is performed at TS position T3 and peripheral number fa. At this time, since the repeater does not know when the control signal (S3) for establishing the link is transmitted from the PS, the control signal (S3)
R3 is prepared as a reception position so as to receive the control signal (S3) at the reception slot position (R3) corresponding to the transmission slot position (T3) of 2) (here, the link establishment signal S3 in the figure is actually Not come to). Where CS
As shown in FIG. 4, the control signal (S1) from the TDM and the control signals (S2, S3) to be transmitted / received to / from the PS
It is not performed in the A frame, but is performed in a certain period (in the example of FIG. 4, the reception period for CS is TDMA frame × n, the transmission / reception period for PS TDMA frame × m
Normally, this cycle is set to be much longer than the TDMA frame).

Also, a control signal (S
2) In the control signal (S3), the slot position T3 /
R3 is selected for the following reasons. As described above, although the frequency switching circuit used in the repeater according to the present invention is one, here, the control CH reception frequency (f1) from the CS and the control CH transmission / reception frequency (fa) to the PS are different. It is necessary to switch one frequency switching circuit in time units according to the frequency. By the way, CS
Is received at the TS position of R1,
If used under the condition that the frequency is switched between the same slot and the adjacent slot, the frequency switching time cannot be sufficiently secured.

Therefore, in this case, R3 / T3 spaced from R1 (T1; normal transmission and reception uses the same slot number) by one slot is used as a control CH transmission and reception TS position to PS. As described above, by using the TS positions spaced by one slot for transmission and reception of the control CH, the slot positions used by the two radio channels have a positional relationship switchable by one frequency switching circuit, and the signal of the control CH is There is no problem of disappearing. Therefore, the transmission / reception priority determination unit provided in the control unit 3 shown in the basic device configuration block of the present invention in FIG. 1 does not determine the priority, and the frequency switching signal for PS communication shown in FIG. (C1) and the frequency switching signal for CS communication (C
2) will be output. This switching signal C
The output timings of C1 and C2 are as shown in FIG.
TS using a signal of this frequency (R1, T in this example)
Since the output needs to be output before the time required for switching by the frequency switching circuit than in 3), the timing is before the time Tp shown in FIG.

In the following sequence, when the repeater receives an incoming signal (S4) from the CS by the control CH, the repeater transmits a link establishment signal (S5) for requesting to establish a communication link. . The CS receiving the link establishment signal (S5) transmits a link assignment signal (S6) for assigning a communication link to the repeater.
The link assignment signal (S6) includes information such as a time slot number and a frequency type symbol used in the communication CH (slot number = T3, frequency type symbol =
f2). In this example, the slot number assigned in the communication CH is T3. However, which slot is assigned is determined by the CS initiative, and the slot position to be assigned may be any of T1 to T4.

A communication sequence in section B (see FIG. 5) A link allocation signal (S
6) receives the signal (S) for call connection.
7, S8) is performed with the CS. Here, the signals (S7, S8) for call connection are not transmitted and received in all TDMA frames, and when there is no signal to be transmitted, an idle signal is transmitted. This is shown in FIG.
Is shown as an idle signal (S51). Here, the case where CS transmission / reception is performed in the call connection sequence is shown. Signals for call connection are intermittently transmitted and received during a frame having no signal for call connection. Because it will take a long time to complete,
An idle signal is generated in a frame having no signal for call connection.

A call connection sequence is performed between the repeater and the CS as described above. In the repeater of the present embodiment, a control CH transmission / reception timing to the PS may occur during the call connection sequence. is there. This situation is shown in FIG. 2, and the control CH with the PS during the call connection sequence with the CS (TS of idle signals S9 and S10 in this example).
Will be transmitted and received. Here, the slot used for transmission and reception by the control CH to the PS is T3,
The frequency is fa, and the slot used for transmission / reception for performing a call connection sequence with CS at the frequency f1 is also T3. T such that the used frequencies fa and f2 with respect to PS and CS use the same slot (T3).
When the use state of S occurs, in the device of the present invention which is configured to be able to switch to only one frequency by one frequency switching circuit, the frequency is switched to either one of the frequencies. The switching operation is as shown. Here, since transmission and reception with the pair PS having a longer transmission and reception timing than the pair CS is prioritized, a switching signal of C1 is sent from the control unit to the frequency switching circuit at the transmission and reception timing with the pair PS (note that In FIG. 4 showing the operation in the above section A, the slots used at the frequencies f1 and fa are skipped by one, and T1,
Since it is T3, one frequency switching circuit has C1,
C2 is alternately used and the frequency is switched).

In this operation, the transmission / reception priority judging unit of the control unit 3 shown in FIG. 1 determines whether the transmission / reception of the pair with the PS and the CS with respect to the CS generated under the use condition of the TS using the same slot (T3). When the priority order of the idle signal (S9, S10) and the control signal (S11, S12) to the PS is determined by a predetermined determination logic, and when it is determined that the control signal to the PS has a higher priority, , A frequency switching circuit 1 of an oscillation wave generator 2 for transmitting a frequency switching signal for PS communication.
The transmission frequency is set to fa, and the control wave is transmitted / received to / from the PS by using the oscillation wave in the radio unit 1.

Here, the reason why the transmission and reception of the control CH to the PS is prioritized will be described as follows. In FIG.
When receiving the incoming signal (S5), the repeater sends a link establishment signal (S6) to the CS, first establishes a radio link with the CS, and then relays the incoming to the PS. Also, PS
In the normal standby state, TDMA timing is maintained by receiving a control CH from the repeater at regular intervals. Therefore, the repeater cannot stop the control CH to the PS while establishing the link with the CS. This is because if the control CH to the PS is stopped, the control CH cannot be received by the PS, so it is recognized that the PS has flowed out of the service area, and the power consumption is suppressed. The operation shifts to the receiving operation at a long interval. In this state, when the repeater completes the establishment of the radio link with the CS, the repeater transmits an incoming signal on the control CH in order to transfer the incoming information from the CS to the PS. In accordance with the operation described above, the operation shifts to the reception operation at a long interval when out of the service area, so that the incoming signal transmitted from the repeater cannot be received immediately. As a result, the repeater takes a long time to establish a wireless link with the PS. Therefore, it is important to prevent such a state, that is, not to shift the PS to the reception operation when out of the service area. For that purpose, it is necessary to give priority to the transmission and reception of the control CH to the PS and avoid the stop of the control CH. is there.

When the repeater completes the sequence of the call connection with the CS by transmitting and receiving signals (S7 to S10, S13) for the call connection with the CS via the communication channel, next, the call with the PS is made. To monitor the connection sequence,
The incoming signal (S16) is changed to P by the control channel with respect to PS.
Send to S. Here, the repeater can identify the PS call to be connected in the sequence of the call connection with the CS, and executes a procedure of sending an incoming signal and establishing a link with the PS as a procedure for the identified PS call. Therefore, this repeater can be called a repeater having a call identification function. The PS receiving such an incoming signal (S16) transmits a link establishment signal (S17) to the repeater. Next, the relay receiving the link establishment signal (S17) sends a signal (S19) for allocating a communication link to the PS. Since the link assignment signal (S19) uses T3 as the communication slot with the CS in the previous procedure, the slot T1 (frequency fb) is used as the communication slot with the PS in consideration of the frequency switching time. Include the information to be assigned. In the sequence from the transmission of the incoming signal (S16) to the transmission of the link assignment signal (S19), the control channel for the PS is formed using the slot T3. This is the same as the above in that an operation for giving priority to transmission and reception is performed.

Communication sequence in section C (see FIG. 6) Thereafter, as in the case of the call connection sequence with CS, a signal for call connection with PS via a communication channel (S20)
To perform a call connection sequence. When the call connection is completed, transmission / reception of communication signals (S22, S23) is performed between the PS and the CS via the repeater through the assigned communication channels. At this time, the switching operation as shown in the time chart of FIG. 6 is performed, and the frequency fb and the C
The frequency f2 is used in slots T3 and R3 with S. f
2 and fb have different frequencies, but since the TS positions are separated by one slot, the condition for making a priority determination in the transmission / reception priority determination unit of the control unit 3 in FIG. 1 does not occur, so that the frequency switching signals C1 and C2 Are alternately output (C in FIG. 6).
1, the output timing of C2), a single frequency switching circuit can sufficiently cope with it, and a good communication result can be obtained.

In the above-described embodiment, a communication device used in a wireless communication system based on an existing PHS communication system has been described as a TDMA communication device. However, the present invention is not limited to such an existing system and does not depart from the idea of the present invention. For example, the present invention may be embodied as being applicable to a communication system configured by a wire in a range.

[0024]

As is apparent from the above description, according to the present invention, in a communication apparatus using the TDMA system which is also used for digital radio communication such as PHS, when performing simultaneous transmission and reception of a plurality of slots. Even if the slot position cannot be set by one frequency switching circuit, by providing a transmission / reception priority determination unit and stopping transmission / reception of the lower priority, it is possible to perform sufficient communication with one frequency switching circuit. Become. Further, according to the TDMA communication apparatus according to the present invention which constitutes a repeater, a PS call to be connected can be identified in a sequence of a call connection with a CS, and an incoming signal is transmitted as a procedure for the identified PS call. PS
Since the procedure for establishing a link can be executed, this repeater can be used as a repeater having a call identification function.

[Brief description of the drawings]

FIG. 1 shows a schematic block diagram of an embodiment of a TDMA communication device according to the present invention configured using one frequency switching circuit.

FIG. 2 is a diagram (part 1) illustrating an example of a communication sequence when a repeater is configured as an embodiment of the TDMA communication apparatus according to the present invention.

FIG. 3 is a diagram (part 2) illustrating one example of a communication sequence when a repeater is configured as an embodiment of the TDMA communication device according to the present invention;

FIG. 4 is a diagram showing T in the communication sequence in section A shown in FIG. 2;
5 is a time chart showing a use state of S and a frequency switching operation state.

FIG. 5 is a time chart showing a use state of a TS and a frequency switching operation state in a communication sequence in a section B shown in FIGS. 2 and 3;

FIG. 6 is a diagram showing T in the communication sequence in section C shown in FIG. 3;
5 is a time chart showing a use state of S and a frequency switching operation state.

FIG. 7 shows, at the top, a TD used in TDMA communication.
The TS configuration based on the MA frame format is illustrated, and the lower part shows the frequency used in a certain communication state corresponding to the TS.

FIG. 8 is a schematic block diagram of a conventional communication device configured using frequency switching circuits 1 and 2 prepared in two systems.

[Explanation of symbols]

 1, 1 ': radio section 2, 2': oscillation wave generation section 2's: selector 3, 3 ': control section

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Tomoyoshi Ohno 3-19-2 Nishishinjuku, Shinjuku-ku, Tokyo Within Nippon Telegraph and Telephone Corporation (72) Inventor Akihiko Uchiyama 22-22 Nagaikecho, Abeno-ku, Osaka-shi, Osaka F-term in Sharp Corporation (reference) 5K018 AA04 BA02 DA11 5K028 AA14 BB04 CC02 HH02 HH03 KK01 LL02 LL11 RR02 5K067 AA33 BB04 CC04 EE02 EE10 EE71 GG01 GG11 HH21 JJ17

Claims (4)

[Claims] 1. TDM comprising a predetermined number of time slots
A TDMA communication apparatus for transmitting and receiving communication data formed on two or more communication channels in accordance with an A data frame format using a frequency set corresponding to each communication channel, wherein each communication channel is used as a frequency used in a transmission / reception unit. The time required for switching to the frequency set corresponding to each communication channel by separating the operation of the frequency switching circuit for switching the frequency set corresponding to the time slot used in each communication channel sufficiently by time. In communication conditions in which time slots used in each communication channel cannot be sufficiently separated in time, the priority of transmission / reception between communication channels is determined according to a predetermined priority determination logic. Judgment and control to switch to the frequency of the communication channel with higher priority TDMA communication apparatus characterized by comprising a control unit for controlling to stop the low transmission and reception of communication channels of position. 2. The TDMA communication apparatus according to claim 1, wherein the switching operation of the frequency switching circuit is performed by allocating a communication link to the communication apparatus set by a public base station;
And performing a call connection sequence with the base station in accordance with the assignment of a communication link with a terminal station set by the communication device based on the obtained call identification result. TD characterized by operating as
MA communication device. 3. The TDMA communication apparatus according to claim 1, wherein a priority for a downlink communication channel is set higher as the priority determination logic.
Communication device. 4. T according to claim 1 or 3
A DMA communication device, wherein the communication channel is a wireless channel.