JP3546816B2 - Communication systems, mobile stations and base stations - Google Patents

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a communication system for performing data communication between a base station and a mobile station, wherein a control channel and a communication channel are synchronized in the mobile station, and a mobile station and a base station in the communication system. About.
[0002]
[Problems to be solved by the invention]
FIG. 7 shows a conventional sequence up to the start of data communication in a communication system for performing data communication between a base station and a mobile station. In this case, considering the case where the mobile station makes a call, the mobile station transmits a link channel establishment request signal to the base station on the control channel. Upon receiving the link channel establishment request signal on the control channel from the mobile station, the base station performs carrier sense on the communication channel and transmits a link channel assignment signal on the control channel to the mobile station. When a link channel assignment signal is received on the control channel, carrier sensing of the communication channel is performed, and a synchronization burst signal is transmitted to the base station on the communication channel.
[0003]
Next, upon receiving the synchronization burst signal on the communication channel from the mobile station, the base station establishes uplink synchronization from the mobile station of the communication channel toward itself and transmits the synchronization burst signal to the mobile station on the communication channel. . When the mobile station receives the synchronization burst signal on the communication channel from the base station, the mobile station establishes downlink synchronization from the base station of the communication channel toward itself.
[0004]
Thereafter, the mobile station starts data communication with the base station, transmits a SABM (Set Asynchronous Balanced Mode) command to the base station, and when the base station receives the SABM command from the mobile station, the UA A (Unnumbered Acknowledge) response is transmitted to the base station. As described above, conventionally, by transmitting and receiving a synchronization burst signal between the base station and the mobile station, synchronization of the communication channel in the uplink direction from the mobile station to the base station and the downlink direction from the base station to the mobile station can be synchronized. It is something to establish.
[0005]
By the way, the method of establishing synchronization by transmitting and receiving such a synchronous burst signal is such that transmission and reception of the synchronous burst signal are performed if data is continuously communicated after establishing synchronization as in circuit-switched communication. The effect on the overall processing related to communication is relatively small.
[0006]
However, on the other hand, if data is intermittently transmitted, such as packet switching communication, a synchronous burst signal is transmitted and received each time data communication is restarted. The effect on the overall processing related to communication is relatively large, and there is a problem that transmission / reception of a synchronous burst signal causes a reduction in communication efficiency.
[0007]
The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a communication system, a mobile station, and a base station capable of improving communication efficiency when performing packet-switched communication. is there.
[0008]
[Means for Solving the Problems]
According to the communication system of the first aspect, in the mobile station, when any signal (for example, a broadcast signal) is received on the control channel from the base station, the control unit goes from the base station of the communication channel to itself. The downlink synchronization is established, and a synchronization establishment completion notification signal for notifying that the downlink synchronization of the communication channel has been established is transmitted to the base station. When the base station receives the synchronization establishment completion notification signal from the mobile station, the control means starts data communication with the mobile station via a communication channel . Therefore, unlike the conventional ones, as required to send and receive sync burst signal, it is possible to establish the downlink direction from the base station of the communication channel to the mobile station synchronization, followed by the communication data communication Since the communication can be started in the channel , communication efficiency can be improved when performing packet-switched communication.
[0009]
According to the communication system of the second aspect, in the mobile station, the control means causes the base station to transmit a signal whose synchronization bit area is larger than the signal from the base station. Then, in the base station, the control means identifies the synchronization bit stored in a signal in which the area of the synchronization bit received from the mobile station is larger than the signal from the base station , thereby controlling the synchronization bit from the mobile station in the communication channel. Establish uplink synchronization toward itself. Therefore, it is not necessary to transmit and receive the synchronization burst signal, and it is possible not only to establish the downlink synchronization from the base station of the communication channel to the mobile station, but also to the uplink of the communication channel from the mobile station to the base station. Since synchronization can be established, communication efficiency can be further improved.
[0010]
According to the communication system of the third aspect, in the mobile station, the control means causes the base station to transmit a signal whose synchronization bit area is larger than the signal from the base station. Then, in the base station, the control means identifies the synchronization bit stored in a signal in which the area of the synchronization bit received from the mobile station is larger than the signal from the base station , thereby controlling the synchronization bit from the mobile station in the communication channel. Establish uplink synchronization toward itself. Therefore, it is not necessary to transmit and receive a synchronization burst signal, and it is possible to establish uplink synchronization from the mobile station of the communication channel to the base station, thereby improving communication efficiency.
[0011]
According to the mobile station of the fourth aspect, when any signal (for example, a broadcast signal) is received on the control channel from the base station, the control unit performs synchronization in a downlink direction from the base station to the communication channel. Is established, and a synchronization establishment completion notification signal for notifying that the downlink synchronization of the communication channel has been established is transmitted to the base station. When the base station receives the synchronization establishment completion notification signal from the mobile station, the base station starts data communication with the mobile station via a communication channel . Therefore, in the same manner as in the above-described claim 1, it is not necessary to transmit and receive the synchronization burst signal, and it is possible to establish downlink synchronization from the base station to the mobile station of the communication channel, Since data communication can be started on a communication channel , communication efficiency can be improved when performing packet-switched communication.
[0012]
According to the mobile station of the fifth aspect, the control means causes the base station to transmit a signal whose synchronization bit area is larger than the signal from the base station. When the base station receives a signal from the mobile station where the area of the synchronization bit is larger than the signal from the base station, the area of the synchronization bit received from the mobile station is larger than the signal from the base station. By identifying the synchronization bit stored in the large signal, the uplink synchronization from the mobile station of the communication channel toward itself is established. Therefore, in the same manner as in the above-described claim 2, it is not necessary to transmit and receive the synchronization burst signal, and it is not only possible to establish downlink synchronization from the base station to the mobile station of the communication channel. Since the synchronization of the communication channel in the uplink direction from the mobile station to the base station can be established, the communication efficiency can be further improved.
[0013]
According to the mobile station of the sixth aspect, the control means causes the base station to transmit a signal whose synchronization bit area is larger than the signal from the base station. When the base station receives a signal from the mobile station where the area of the synchronization bit is larger than the signal from the base station, the area of the synchronization bit received from the mobile station is larger than the signal from the base station. By identifying the synchronization bit stored in the large signal, the uplink synchronization from the mobile station of the communication channel toward itself is established. Therefore, in the same manner as in the third aspect, it is not necessary to transmit and receive a synchronization burst signal, and it is possible to establish uplink synchronization from a mobile station to a base station on a communication channel. Efficiency can be improved.
[0014]
According to the base station described in claim 7, the mobile station establishes downlink synchronization from the base station of the communication channel toward itself by receiving any signal on the control channel from the base station and performs communication. A synchronization establishment completion notification signal for notifying that the downlink synchronization of the channel has been established is transmitted to the base station. When receiving the synchronization establishment completion notification signal from the mobile station, the control means starts data communication with the mobile station via a communication channel . Therefore, in the same manner as the above-described claim 1, it is not necessary to transmit and receive the synchronization burst signal, and it is possible to establish downlink synchronization from the base station to the mobile station of the communication channel, Since data communication can be started on a communication channel , communication efficiency can be improved when performing packet-switched communication.

[0015]
According to the base station of the eighth aspect, when a signal whose synchronization bit area is larger than the signal from the base station is received from the mobile station, the control means controls the synchronization received from the received mobile station. By identifying a synchronization bit stored in a signal whose area of the transmission bit is larger than that of the signal from the base station , uplink synchronization from the mobile station to the self in the communication channel is established. Therefore, in the same manner as in the above-described claim 2, it is not necessary to transmit and receive the synchronization burst signal, and it is not only possible to establish downlink synchronization from the base station to the mobile station of the communication channel. Since the synchronization of the communication channel in the uplink direction from the mobile station to the base station can be established, the communication efficiency can be further improved.
[0016]
According to the ninth aspect of the present invention, when a signal whose synchronization bit area is larger than the signal from the base station is received from the mobile station, the control means controls the synchronization received from the received mobile station. By identifying a synchronization bit stored in a signal whose area of the transmission bit is larger than that of the signal from the base station , uplink synchronization from the mobile station to the self in the communication channel is established. Therefore, in the same manner as in the third aspect, it is not necessary to transmit and receive a synchronization burst signal, and it is possible to establish uplink synchronization from a mobile station to a base station on a communication channel. Efficiency can be improved.
[0017]
BEST MODE FOR CARRYING OUT THE INVENTION
An embodiment in which the present invention is applied to a PHS (Personal Handyphone System) will be described below with reference to FIGS.
First, FIG. 2 shows a configuration of a base station (CS: Cell Station) as a functional block diagram. In the base station 1, an RF (Radio Frequency) circuit 2 generates a reception signal by performing RF processing on a radio wave captured by the antenna 2a, outputs the generated reception signal to a demodulation circuit 3, and the demodulation circuit 3 The received signal input from the circuit 2 is demodulated, and the demodulated received signal is output to the signal processing circuit 4. The modulation circuit 5 modulates the transmission signal input from the signal processing circuit 4, outputs the modulated transmission signal to the RF circuit 2, and the RF circuit 2 performs the RF processing on the transmission signal input from the modulation circuit 5. As a result, a radio wave is emitted from the antenna 2a. The signal processing circuit 4 performs signal processing with a PHS connection device (not shown) on the communication network side.
[0018]
The CPU 6 (control means in the present invention) is composed of a microcomputer, and controls the operation of the base station 1 by executing a control program. The memory 7 stores various types of storage information, and the CPU 6 reads various types of storage information from the memory 7.
[0019]
Next, FIG. 3 shows a configuration of a mobile station (PS: Personal Station) as a functional block diagram. In the mobile station 8, the RF amplification circuit 9 inputs a radio wave captured by the antenna 10 as a reception signal through the switch 11, amplifies the input reception signal, and outputs the amplified reception signal to the first multiplication circuit 12. The first multiplication circuit 12 multiplies the received signal input from the RF amplification circuit 9 by a local oscillation signal from the frequency synthesizer 13 to generate an intermediate frequency signal, and converts the generated intermediate frequency signal to a band-pass filter (BPF). ) 14, the band-pass filter 14 removes unnecessary frequency components of the intermediate frequency signal input from the first multiplication circuit 12, and outputs the intermediate frequency signal from which the unnecessary frequency components have been removed to the second multiplication circuit 15. I do.
[0020]
The second multiplication circuit 15 multiplies the intermediate frequency signal input from the band-pass filter 14 by the local oscillation signal from the local oscillation circuit 16 to generate a baseband signal, and converts the generated baseband signal to a demodulation circuit 17 The demodulation circuit 17 demodulates the baseband signal input from the second multiplication circuit 15 and outputs the demodulated baseband signal to the channel codec 18. The channel codec 18 performs error correction processing on the baseband signal input from the demodulation circuit 17, outputs audio data to the speaker 20 through the audio codec 19, and transmits reception control data to the CPU 21 (control means in the present invention). ).
[0021]
Further, the channel codec 18 outputs audio data input from the microphone 22 through the audio codec 19 to the modulation circuit 23 as an intermediate frequency signal, and the modulation circuit 23 performs a modulation process on the intermediate frequency signal input from the channel codec 18 to perform modulation. The processed intermediate frequency signal is output to the third multiplier 24.
[0022]
The third multiplication circuit 24 multiplies the intermediate frequency signal input from the modulation circuit 23 by the local oscillation signal from the frequency synthesizer 13 to generate a transmission signal, and outputs the generated transmission signal to the bandpass filter 25. , The band-pass filter 25 removes unnecessary frequency components from the transmission signal input from the third multiplication circuit 24 and outputs the transmission signal from which the unnecessary frequency components have been removed to the power amplification circuit 26.
[0023]
Then, the power amplification circuit 26 power-amplifies the transmission signal input from the band-pass filter 25, and the antenna 10 radiates the transmission signal input from the power amplification circuit 26 through the switch 11 as a radio wave.
[0024]
The CPU 21 is configured by a microcomputer, and controls the operation of the mobile station 8 by executing a control program. Further, the CPU 21 controls an operation corresponding to the key input by detecting a key input of the keyboard 27, and controls a display of the LCD 28 by outputting a display command to an LCD (Liquid Crystal Display) 28. . The memory 29 stores various types of storage information, and the CPU 21 reads out various types of storage information from the memory 29.
[0025]
Next, the operation of the above configuration will be described with reference to FIGS. 1 and 4 to 6. FIG. 4 is a flowchart illustrating the control performed by the CPU 6 in the base station 1, and FIG. 5 is a flowchart illustrating the control performed by the CPU 21 in the mobile station 8. FIG. 1 shows a sequence between the base station and the mobile station corresponding to such control. In the mobile station 8, the control channel and the communication channel are synchronized.
[0026]
First, in the base station 1, the CPU 6 performs carrier sensing (step S1), and causes the mobile station 8 to transmit a downlink packet communication channel assignment signal on a control channel (step S2).
[0027]
In the mobile station 8, when detecting that the downlink channel communication channel assignment signal has been received on the control channel from the base station 1, the CPU 21 determines “YES” in step T1 and performs carrier sense of the communication channel ( Step T2). Then, the CPU 21 determines whether or not the downlink synchronization from the base station 1 to the mobile station 8 of the communication channel is maintained (step T3).
[0028]
By the way, here, if the downlink synchronization of the communication channel is not held, the CPU 21 determines “NO” in step T3, and any signal (for example, a broadcast signal) is transmitted from the base station 1 on the control channel. It is determined whether or not it has been received (step T4). Then, when detecting that any signal has been received on the control channel, the CPU 21 determines “YES” in step T4 and synchronizes with the received signal to thereby control the control channel and the communication. Since the channels are synchronized, downlink synchronization of the communication channel is established (step T5). Then, the CPU 21 causes the base station 1 to transmit a synchronization establishment completion notification signal on the control channel (step T6).
[0029]
In the base station 1, when the CPU 6 detects that the synchronization establishment completion notification signal has been received from the mobile station 8 on the control channel, the CPU 6 determines “YES” in step S3, thereafter starts data communication, and starts the SABM. The mobile station 8 transmits a (Set Asynchronous Balanced Mode) command.
[0030]
Now, the slot configuration of the signal will be described. 6A shows a slot configuration of SABM and I (Information), which are downlink signals from the base station 1 to the mobile station 8, and FIG. 6B shows the slot configuration of the base station 1 from the mobile station 8. 3 shows slot configurations of UA (Unnumbered Acknowledge) and RR (Receive Ready), which are signals in the upward direction toward.
[0031]
In this case, UA and RR, which are uplink signals from the mobile station 8 to the base station 1, are compared with SABM and I, which are downlink signals from the base station 1 to the mobile station 8, and the preamble area and the synchronization are different. A large word area is secured, and a small data area is secured accordingly. The preamble area and the synchronization word area here correspond to the synchronization bit area in the present invention.
[0032]
By the way, in the mobile station 8, after starting the data communication with the mobile station 8, when detecting that the SABM or I is received from the base station 1, the CPU 21 determines “YES” in step T 7. Then, by synchronizing with the received SABM or I, the downlink synchronization of the communication channel is maintained (step T8). Then, the CPU 21 repeats the processing of the above-described steps T7 and T8 until the data communication ends (step T9).
[0033]
On the other hand, in base station 1, after starting data communication with mobile station 8, CPU 6 determines that “UA” or RR has been received from mobile station 8, and determines “YES” in step S 4. Then, by identifying the preamble and the synchronization word stored in the received UA or RR, the uplink synchronization from the mobile station 8 to the base station 1 of the communication channel is established (step S5). Then, the CPU 6 repeats the processing of steps S4 and S5 described above until the data communication ends (step S6).
[0034]
As described above, according to the present embodiment, after receiving the downlink packet communication channel assignment signal on the control channel from the base station 1, the mobile station 8 transmits any signal on the control channel from the base station 1. (E.g., a broadcast signal), it is configured to establish downlink synchronization from the base station 1 of the communication channel toward itself, so that the transmission and reception of the synchronization burst signal is different from the conventional one. As unnecessary, downlink synchronization from the base station 1 to the mobile station 8 of the communication channel can be established, and subsequently, data communication can be started. Communication efficiency can be improved.
[0035]
After starting data communication with the mobile station 8, the base station 1 receives a UA or RR from the mobile station 8, and identifies a preamble and a synchronization word stored in the received UA or RR. Thus, since the synchronization in the upward direction from the mobile station 8 to the communication channel itself is established, it is not necessary to transmit and receive the synchronization burst signal, and the downlink from the base station 1 to the mobile station 8 in the communication channel becomes unnecessary. In addition to establishing the synchronization in the direction, it is also possible to establish the synchronization in the uplink direction from the mobile station 8 to the base station 1 of the communication channel, thereby further improving the communication efficiency. .
[0036]
The present invention is not limited to the above-described embodiment, but can be modified or expanded as follows.
The PHS may be any of a public system and a self-employed (for business use) system, and may be a communication system in which a public system and a self-employed system are mixed. Further, the communication system is not limited to the PHS, and may be another communication system.
In UA and RR, which are uplink signals from the mobile station to the base station, the preamble area and the synchronization word area may have other numbers of bits.
[Brief description of the drawings]
FIG. 1 is a sequence diagram showing an embodiment of the present invention. FIG. 2 is a functional block diagram showing a configuration of a base station. FIG. 3 is a functional block diagram showing a configuration of a mobile station. FIG. FIG. 5 is a flowchart showing control contents of a mobile station. FIG. 6 is a diagram showing a signal slot configuration. FIG. 7 is a conventional sequence diagram.
In the drawing, 1 is a base station, 6 is a CPU (control means), 8 is a mobile station, and 21 is a CPU (control means).

Claims (9)

In a communication system in which data communication is performed between a base station and a mobile station using a communication channel, and the control channel and the communication channel are synchronized in the mobile station,
The mobile station establishes downlink synchronization toward itself from the base station of the communication channel by receiving any signal on the control channel from the base station, and establishes downlink synchronization of the communication channel. Control means for transmitting to the base station a synchronization establishment completion notification signal for notifying
A communication system comprising: a base station; and a control unit that starts data communication with the mobile station via a communication channel when a synchronization establishment completion notification signal is received from the mobile station. The control means of the mobile station causes the base station to transmit a signal whose synchronization bit area is larger than the signal from the base station,
The control means of the base station establishes uplink synchronization of the communication channel from the mobile station toward itself by identifying a synchronization bit stored in the signal received from the mobile station. Item 2. The communication system according to Item 1. In a communication system for performing data communication between a base station and a mobile station through a communication channel ,
The mobile station includes control means for causing the base station to transmit a signal whose synchronization bit area is larger than a signal from the base station,
The base station includes a control unit that establishes uplink synchronization from the mobile station toward the self in the communication channel by identifying a synchronization bit stored in the signal received from the mobile station. Communication system. The data communication with the base station, wherein the control channel and the communication channel are synchronized and the data communication with the mobile station is started on the communication channel by receiving the synchronization establishment completion notification signal from the mobile station. In a mobile station performing on a communication channel ,
To establish downlink synchronization from the base station of the communication channel toward itself by receiving any signal on the control channel from the base station, and to notify that downlink synchronization of the communication channel has been established. A mobile station comprising a control unit for transmitting a synchronization establishment completion notification signal to the base station. The base station identifies the synchronization bits stored in a signal in which the area of the synchronization bits received from the mobile station is larger than the signal from the base station, thereby identifying the synchronization bits in the uplink direction from the mobile station to the communication channel. Configured to establish synchronization,
The mobile station according to claim 4, wherein the control means causes the base station to transmit a signal whose synchronization bit area is larger than a signal from the base station. Identifying the synchronization bits stored in the signal where the area of the synchronization bits received from the mobile station is larger than the signal from the base station establishes uplink synchronization of the communication channel from the mobile station toward itself. In a mobile station that performs data communication with a base station configured as described above using a communication channel ,
A mobile station comprising control means for transmitting a signal whose synchronization bit area is larger than a signal from the base station to the base station. A signal for receiving a signal on the control channel from the base station to establish downlink synchronization from the base station of the communication channel toward itself and to notify that downlink synchronization of the communication channel has been established. In the base station performing data communication on a communication channel with a mobile station configured to transmit a synchronization establishment completion notification signal to the base station,
A base station comprising control means for starting data communication with a mobile station on a communication channel when a synchronization establishment completion notification signal is received from the mobile station. The mobile station is configured to transmit to the base station a signal whose synchronization bit area is larger than a signal from the base station;
8. The communication system according to claim 7, wherein the control unit establishes uplink synchronization of the communication channel from the mobile station toward itself by identifying a synchronization bit stored in the signal received from the mobile station. Base station. The base station performs data communication with the communication channel between the region of the synchronization bits and configured mobile station to transmit a larger signal than the signal from the base station to the base station,
A base station comprising: a control unit that establishes uplink synchronization from a mobile station to a communication channel of the mobile station by identifying a synchronization bit stored in the signal received from the mobile station.

Images