JP3361754B2 - TDMA communication device - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a communication device using a TDMA system which is also used in digital radio communication such as PHS, and more specifically, a frequency switching control system in multiple time slot (TS) simultaneous communication. The present invention relates to the TDMA communication device.

[0002]

2. Description of the Related Art In a conventional wireless communication system using a TDMA system, in a system using a specific frequency for each TS, in order to access a plurality of TSs at the same time, a plurality of frequency switching circuits are provided for each TS. It corresponded by the thing. Here, such a conventional method will be described with reference to the attached FIGS. In the upper part of FIG. 7, T generally used in TDMA communication is shown.
An example of the TS structure according to the DMA frame format is shown.
The lower part of the figure shows the frequencies used in a certain communication state in association with the TS. In the example of FIG. 7, when the number of time divisions is 4, the transmission section (TX) has 4 slots of TS1 to TS4, and the reception section (RX) has 4 slots of ts1 to ts4.

When the frequency f1 is used on TS2 (ts2) and the frequency f2 is used on TS3 (ts3) of this TS configuration at the same time, since the frequencies f1 and f2 are different on different slots, TS2 ( ts2) The frequency is changed from f1 to f2 from the end of the section to the start of TS3 (ts3).
Need to switch to. However, since the relationship between TS2 and TS3 is adjacent slots as shown in FIG. 7, it is technically difficult to perform frequency switching between them. Therefore, conventionally, two systems of frequency switching circuits have been prepared. FIG. 8 shows a schematic block diagram of a conventional communication device configured by using frequency switching circuits 1 and 2 provided in two systems. In the apparatus shown in FIG. 8, two systems of frequency switching circuits 1 and 2 are prepared in the oscillating wave generating section 2'supplied to the radio section 1 ', and the oscillating signal from one of the circuits is used as the control section 3'. It is selected by the selector 2's operated by the switching signal from. As described above, by switching and supplying the used frequency by the switching signal from the control unit 3'for each TS, it is possible to use a stable frequency in a plurality of slots and to perform simultaneous communication. However, in the conventional method shown in FIG. 8, a plurality of frequency switching circuits are required, which leads to an increase in size of the apparatus and an increase in cost.

On the other hand, in recent PHS systems and the like, the system is located between a base station and a mobile station, has a function of relaying radio waves of each, and has a repeater that 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 mobile station. Since the repeater is composed of one frequency switching circuit in the slot used by these two radio channels, In order to secure a sufficient time required for frequency switching, one slot or more is used to communicate with both stations. However, since this repeater only has a function of relaying the signal from the base station or the mobile station through, the time slot position to be used is assigned by the base station side between the base stations. , Accordingly, slot positions are also allocated between the repeater and the mobile station. In other words, since the slots used for the base station and the mobile station are assigned before the call connection procedure between the relay station and the base station is executed, the slot used for communication with the base station and the mobile station As for the positional relationship of the slots used between and, it is possible to operate in such a setting that the slot positions separated by one or more are maintained in both the operation by the control channel and the operation by the communication channel, and the repeater has one frequency. Even if it is composed of a switching circuit, it is possible to secure a sufficient time required for frequency switching, and there is no problem in operation.

[0005]

However, even one having a relay function in which one frequency switching circuit is operated to perform relay, has a function to relay a signal as a through signal depending on the above-mentioned base station. In contrast to the corresponding terminal, after the relay identifies the call of the terminal (that is, after the sequence of call connections required to determine the call type is performed between the base station and the relay). A call identification repeater that establishes a link and performs a call connection procedure and that can communicate with a call identified by having a function equivalent to that of a base station is conceivable. Considering the operation of this repeater, the communication procedure up to the call connection sequence performed between the base station and the repeater by channel allocation led by the base station and the link allocation procedure performed by the control channel between the repeater and the terminal are performed simultaneously. In some cases, the adjacent slot or the same slot may be used temporarily, and at this time, there arises a problem that the signal of the control channel is lost. The present invention has been made in view of the above-mentioned problems in the prior art or the prior art,
In the above-mentioned TDMA communication device which operates one frequency switching circuit and has a call discrimination relay function,
The TDMA provided with means for enabling the intended communication operation to be executed without any trouble even if the same slot is used.
The purpose is to provide a communication device.

[0006]

As a technical means for achieving the above object, in the present invention, means for making transmission / reception priority determination is provided in the control unit, and adjacent or same slots are used as communication channels to be operated simultaneously. In this case, by temporarily stopping transmission / reception of either one of the lower priority and communicating with the higher priority,
Communication is also possible with one frequency switching circuit.

The invention of each claim constitutes the following means. According to a first aspect of the present invention, T which transmits / receives communication data formed on two or more communication channels according to a TDMA data frame format including a predetermined number of time slots using a frequency set corresponding to each communication channel.
In the DMA communication device, the operation of the frequency switching circuit for switching the frequency set corresponding to each communication channel as the frequency used in the transmission / reception unit is performed by separating the time slots used in each communication channel sufficiently. The communication time is controlled so that there is a margin in the time required to switch to the frequency set for each communication channel, and it is predetermined in the communication condition that the time slots used in each communication channel cannot be separated in time. Determine the priority of transmission and reception between each communication channel according to the determined priority determination logic, control to switch to the frequency of the communication channel with higher priority, and control to stop transmission and reception of communication channel with lower priority It is characterized by having a control unit that operates.

The invention according to claim 2 is the TDM according to claim 1.
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 to obtain a call. The present invention is characterized in that the communication device is operated according to the allocation of the communication link with the terminal station set by the communication device based on the identification result, and the communication device operates as a call discrimination repeater.

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

The invention according to claim 4 is the TDMA communication apparatus according to claim 1 or 3, wherein the communication channel is a radio channel.

[0011]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the accompanying drawings. FIG. 1 is a schematic block diagram of an embodiment of a TDMA communication device according to the present invention configured by using one frequency switching circuit. In the device shown in FIG. 1, a frequency switching circuit of one system is prepared in the generation unit 2 of the oscillating wave supplied to the wireless unit 1, and a switching signal from the control unit 3, for example, frequency switching for portable station (PS) communication is provided. 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 of a use frequency according to the TS of the communication channel, and supply the same to the wireless unit. It is possible to communicate. Further, as shown in FIG. 1, the control unit 3 has a transmission / reception priority determination unit, which gives priority to which signal when a transmission / reception signal occurs in the same time slot. Whether or not the operation is controlled in accordance with the result of this determination is made. Details of such operation will be clarified in the description of the operation sequence of the example described later in which this embodiment is further embodied.

FIG. 2 (No. 1) and FIG. 3 (No. 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 FIGS. 2 and 3, time progresses from the top to the bottom of the figure, and the transmission of the base station and the mobile station centering on the repeater,
Received signals (eg (S1), (S2) ...) Are indicated by ↑, and the meaning of the signals is indicated by ↑. Also, the transmission / reception time slot number (eg, as an operating condition of the repeater).
R1, T3 ... Here, R1: first reception slot, T3:
Third transmission slot) and frequency type symbol (eg fa, f
2) is shown in the upper and lower rows of the frame, respectively. The operation of the repeater of this embodiment will be described with reference to the communication sequence of FIG. This operation is explained in the communication sequence A,
The operation will be described separately for the three sections B and C (the sections A, B, and C are shown on the right end side of FIGS. 2 and 3 as well). The operation in the sequence of each A, B, and C section corresponds to the time charts showing the TS usage state and the switching operation shown in FIGS. 4, 5, and 6, respectively.

Communication sequence in section A (see FIG. 4) The repeater first receives the control signal (S1) from the base station (hereinafter referred to as CS) on the control channel at "TS position R1 frequency f1". Upon receiving this control signal (S1), the repeater then sends the control signal (S2) by the control channel to the mobile station (hereinafter referred to as PS) in this example.
Transmission is performed at the TS position T3 and the peripheral edge number fa. At this time, the repeater does not know when the control signal (S3) for establishing the link is sent from the PS, and therefore the control signal (S3)
2) Prepare R3 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) (here, the link establishment signal S3 in the figure is actually Haven't come to). Here, CS
The control signal (S1) from the TDM and the control signals (S2, S3) transmitted / received to / from the PS are all TDM as shown in FIG.
It is not performed in the A frame and has a certain fixed period (in the example of FIG. 4, the reception period for CS is TDMA frame × n, the transmission / reception period for PS is TDMA frame × m).
In general, this cycle is a cycle considerably longer than the TDMA frame).

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

Therefore, in this case, R3 / T3 separated by one slot from R1 (T1; normal transmission / reception uses the same slot number) is used as the control CH transmission / reception TS position to the PS. In this way, by using the TS positions spaced apart by one slot for control CH transmission / reception, the slot positions used by two radio channels have a positional relationship that can be switched by one frequency switching circuit, and the control CH signal is The problem of disappearing does not occur. 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 order, and the frequency switching signal for PS communication shown in FIG. (C1) and frequency switching signal for CS communication (C
Both 2) will be output. This switching signal C
The output timings of 1 and C2 are as shown in FIG.
TS using a signal of this frequency (R1, T in this example)
Since it is necessary to output before the time required for the frequency switching circuit to switch rather than 3), the timing is before the time Tp shown in FIG.

In the next subsequent sequence, when the relay receives the incoming signal (S4) from the CS by the control CH, the relay transmits a link establishment signal (S5) requesting to establish a communication link. . The CS that has received the link establishment signal (S5) transmits a link allocation signal (S6) for allocating a communication link to the repeater.
This link allocation signal (S6) includes information such as the time slot number and frequency type symbol used in the communication CH (in the example of FIG. 2, slot number = T3, frequency type symbol =).
f2). In this example, the slot number assigned by the communication CH is T3, but which slot is to be assigned is determined by the CS, and the assigned slot position may be any of T1 to T4.

Communication sequence in section B (see FIG. 5) Link allocation signal (S for allocating communication link)
In the repeater receiving 6), the signal (S
7, S8) is transmitted / received to / from CS. Here, the signals (S7, S8) for call connection are not transmitted / 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 transmitted / received intermittently between frames with no signal for call connection. Since it will take quite a long time to complete,
An idle signal is generated in a frame where there is no signal for call connection.

As described above, the call connection sequence is performed between the repeater and the CS, but in the repeater of this example, the control CH transmission / reception timing to the PS may occur during this call connection sequence. is there. This state is shown in FIG. 2, and the control CH with the PS during the call connection sequence with the CS (TS of the 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, while the slot used for transmission / reception for performing the call connection sequence with the CS on the frequency f1 is also T3. T such that the pair PS and the pair CS use frequencies fa and f2 use the same slot (T3).
When the use state of S occurs, in the device of the present invention configured so that only one frequency can be switched by one frequency switching circuit, the frequency is switched to either one of the frequencies, as shown in the time chart of FIG. The switching operation is as shown. Here, since the transmission / reception with the pair PS, which has a transmission / reception timing with a longer interval than the pair CS, is prioritized, the switching signal of C1 is sent from the control unit to the frequency switching circuit at the transmission / reception timing with the pair PS (note that In FIG. 4 showing the operation in the above-mentioned section A, one slot used at frequencies f1 and fa skips T1,
Since it is T3, one frequency switching circuit has C1,
C2 is used by alternately switching the feed frequency).

In this operation, the transmission / reception priority determination unit of the control unit 3 shown in FIG. 1 sends to the CS generated under the use condition of the TS such that transmission / reception of PS and CS uses the same slot (T3). When the priority of the idle signal (S9, S10) and the control signal (S11, S12) to the PS is determined by a predetermined determination logic, and it is determined that the control signal to the PS has a higher priority. , The frequency switching circuit 1 of the oscillation wave generator 2 for the frequency switching signal for PS communication
The transmission frequency is set to fa and the oscillating wave is used in the radio section 1 to perform control CH transmission / reception with the PS.

Here, the reason why the control CH transmission / reception to / from the PS is prioritized is explained as follows. In FIG.
When the incoming signal (S5) is received, the relay sends a link establishment signal (S6) to the CS to establish a wireless link with the CS first, and then relays the incoming signal to the PS. Also, PS
Holds the TDMA timing by receiving the control CH from the repeater at regular intervals in the normal standby state. Therefore, the relay 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 PS will not be able to receive the control CH, so the PS recognizes that it has flowed out of the service area, and in order to reduce power consumption, it is better than the normal standby reception interval. The operation shifts to receiving at long intervals. In this state, when the relay completes the establishment of the wireless link with the CS, the relay transmits an incoming signal on the control CH to transfer the incoming information from the CS to the PS. Since the operation shifts to a long interval reception operation during out-of-service according to the above operation, the incoming signal sent 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, to prevent the PS from shifting to the reception operation when it is out of the service area. Therefore, it is necessary to give priority to control CH transmission / reception to the PS and avoid stopping the control CH. is there.

When the repeater completes the sequence of call connection with CS by transmitting and receiving signals (S7 to S10, S13) for call connection with CS via the communication channel, the repeater then calls PS. To monitor the connection sequence,
The incoming signal (S16) is set to P by the control channel with the PS.
Send to S. Here, the PS call to be connected can be identified in the sequence of the call connection with the CS in the repeater, and as a procedure for the identified PS call, an incoming signal is sent and a procedure for establishing a link with the PS is executed. Therefore, this repeater can be called a repeater having a call identification function. The PS that has received the incoming signal (S16) transmits a link establishment signal (S17) to the repeater. Next, the repeater receiving the link establishment signal (S17) sends a signal (S19) for allocating the communication link to the PS. In this link allocation signal (S19), since T3 is used as the communication slot with the CS in the above procedure, the slot T1 (frequency fb) is used as the communication slot with the PS in consideration of the frequency switching time. Include information to assign. In the sequence from the transmission of the incoming signal (S16) to the transmission of the link allocation signal (S19), the control channel for the PS is formed using the slot T3. Therefore, the control channel from the communication channel to the CS to the control CH to the PS. This is the same as the above in that the operation of prioritizing transmission / reception is performed.

・ Communication sequence of section C (see FIG. 6) After this, similar to the call connection sequence with CS, a signal for call connection with PS via the communication channel (S20)
A call connection sequence is performed by transmitting and receiving. When the call connection is completed, the communication signals (S22, S23) are transmitted and received between the PS-CSs via the relays by the respective assigned communication channels. At this time, the switching operation is as shown in the time chart of FIG. 6, and the frequency fb and the pair C are set in the slots T1 and R1 with the pair PS.
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 the priority determination in the transmission / reception priority determination unit of the control unit 3 of FIG. 1 does not occur, so the frequency switching signals C1, C2 Alternately output (C in FIG. 6
By indicating the output timings of 1 and C2), even one frequency switching circuit can sufficiently cope with it, and a good communication result can be obtained.

Although the above-described embodiment describes the communication apparatus used as the TDMA communication apparatus in the wireless communication system based on the existing PHS communication system, the invention is not limited to such existing system and is not deviated from the idea of the present invention. For example, it may be implemented as applicable to a communication system configured by wire in the range.

[0024]

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

[Brief description of drawings]

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

FIG. 2 is a diagram (No. 1) 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.

FIG. 3 is a diagram (No. 2) 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.

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

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

6 is a T in the communication sequence of section C shown in FIG.
7 is a time chart showing a usage state of S and a frequency switching operation state.

FIG. 7 shows an TD used in TDMA communication in the upper part.
An example of a TS configuration according to the MA frame format is illustrated, and the lower side shows the frequencies used in a certain communication state in association with the TS.

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

[Explanation of symbols]

1, 1 '... Radio section 2, 2 '... Oscillation wave generator 2's ... selector 3, 3 '... control unit

Front page continuation (72) Inventor Akihiko Uchiyama 22-22 Nagaike-cho, Abeno-ku, Osaka City, Osaka Prefecture (56) References JP-A-60-14541 (JP, A) JP-A-8-130765 (JP) , A) JP-A-8-322078 (JP, A) JP-A-9-107580 (JP, A) JP-A-9-322236 (JP, A) (58) Fields investigated (Int.Cl. ⁷ , DB) Name) H04J 3/00-3/26 H01L 5/14-5/18 H01L 5/22-5/26 H04B 7/14-7/22 H04B 7/24-7/26 H04Q 7/00-7/04 JISC file (JOIS)

Claims (4)

(57) [Claims] 1. A TDM comprising a predetermined number of time slots.
A TDMA communication device for transmitting and receiving communication data formed on two or more communication channels according to a data frame format by using frequencies set corresponding to the respective communication channels, wherein each communication channel is used as a frequency used by a transmitting and receiving section. The time required to switch 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 In a communication condition in which the time slots used in each communication channel cannot be sufficiently separated in time, priority is given to transmission / reception between communication channels according to a predetermined priority determination logic. Judgment, control to switch to the frequency of the communication channel with higher priority, and 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 device according to claim 1, wherein the switching operation of the frequency switching circuit is assigned a communication link with the communication device, which is set by a public base station,
And a call identification repeater for completing the call connection sequence with the base station and assigning a communication link with the 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 the priority of the downlink communication channel is set high as the priority determination logic.
Communication device. 4. The T according to claim 1 or 3.
A DMA communication device, wherein the communication channel is a wireless channel.