JP2002271249A - Radio connecting equipment and method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enable standby operation by making connections to a radio base station and other radio terminals with a different timing of the same channel by synchronously capturing in the state. SOLUTION: When connection with the radio base station is made, phase locking is established with a master demodulation part (DEM0) 2, and this phase information is held with a symbol counter 7 and suitably reloaded on the master demodulation part (DEM0) 2. In the flywheel state where influence is not exerted upon other operations while the phase state is being held, control information is sent out to other mobile telephone terminals, with different timing of the same channel for the radio base station. Data from the mobile telephone terminals are captured using a sub-demodulation parts (DEM 1-3) 3, and clock phase difference of received data is absorbed with an FIFO memory 4. A sub- clock symbol counter 8 holds phase information by data capturing of other mobile telephone terminals and reloads the information on the sub-demodulation parts (DEM 1-3) 3.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a radio connection apparatus and method for establishing a synchronization with a radio base station and then connecting another radio terminal such as a mobile telephone terminal to perform a standby operation.

[0002]

2. Description of the Related Art As this type of wireless connection device, for example, a communication protocol of a TDMA-TDD system is used.
Devices that connect and relay wireless base stations connected to the public network and wireless terminals on the private network, and devices that connect wireless terminals at locations where radio waves are weak, such as in buildings, to wireless base stations are known. Have been.

Conventionally, in a wireless connection apparatus using such a communication protocol of the TDMA-TDD system, when connecting to another mobile telephone terminal (PS), usually, a timing other than the same channel, that is, the timing of another channel is used. Only the standby operation can be performed, and two wireless devices (transmitter / receiver) and a channel codec are required to perform the standby operation on the same channel.

[0004]

However, providing two wireless devices and a channel codec in a wireless connection device for performing a standby operation on the same channel leads to an increase in circuit scale and an increase in cost. I will.

[0005] The present invention has been made in view of the above circumstances, and when establishing a synchronization with a radio base station and then connecting another radio terminal such as a mobile telephone terminal, two radios and a channel codec are used. An object of the present invention is to provide a wireless connection device and a wireless connection device capable of performing a standby operation at different timings of the same channel with a simple circuit configuration without providing.

[0006]

SUMMARY OF THE INVENTION The present invention is, firstly, a radio connection apparatus which establishes synchronization with a radio base station and then connects another radio terminal to perform a standby operation. First synchronization acquisition means for acquiring reception data in a demodulation section in synchronization with a clock phase of a base station; and controlling the demodulation section to be in a state not synchronized with the clock phase while holding information on the synchronized clock phase. A phase control unit, a transmission unit that transmits control information to the other wireless terminal based on the clock phase, and a channel that performs synchronization acquisition for the wireless base station based on the transmitted control information. A second synchronization acquisition unit for acquiring reception data by a demodulation unit in synchronization with a different clock phase of the another wireless terminal in the same channel.

Secondly, the apparatus further comprises a plurality of demodulators for demodulating received data from a plurality of connection destinations including the radio base station and the other radio terminal, respectively. In order to capture the clock phase, a plurality of demodulation units that perform synchronous capture for each clock phase are provided with a phase difference absorbing means for absorbing a clock phase difference.

[0008] Thirdly, there are provided a plurality of demodulators for respectively demodulating data received from a plurality of connection destinations including the radio base station and the other radio terminal, and as the first synchronization acquisition means, A first symbol counter that counts symbol bits while holding information on the clock phase of the radio base station and reloads this phase information into a first demodulation unit; And a second symbol counter that counts the symbol bits while holding the clock phase information of the wireless terminal and reloads the phase information into the second demodulation unit.

A fourth aspect of the present invention is a radio connection method for establishing a synchronization with a radio base station and then connecting another radio terminal to perform a standby operation. A first synchronization acquisition step of synchronously acquiring reception data at the demodulation unit, and a phase control step of controlling the demodulation unit to be in a state where it is not synchronized with the clock phase while holding the information of the synchronized clock phase; On the basis of the clock phase, a transmission step of transmitting control information to the other wireless terminal, and, based on the transmitted control information, on the same channel as a channel that has acquired synchronization with the wireless base station, A second synchronization acquisition step in which the demodulation section acquires reception data in synchronization with a different clock phase of another wireless terminal.

In the present invention, after establishing synchronization with the radio base station, when connecting another radio terminal to perform a standby operation, the first synchronization acquisition means synchronizes with the clock phase of the radio base station. The received data is captured by the demodulation unit, and the demodulation unit is controlled so as not to be synchronized with the clock phase while holding the information of the synchronized clock phase by the phase control unit, and the transmission unit uses the clock phase as a reference. The control information is transmitted to another wireless terminal, and demodulated in synchronization with a different clock phase of the other wireless terminal by the second synchronization acquisition means on the same channel as the channel on which synchronization acquisition was performed on the wireless base station. Section captures the received data.

[0011] Thus, after establishing synchronization with the radio base station, when connecting another radio terminal such as a mobile telephone terminal, two radios (transmitter / receiver) and a channel codec are provided as in the related art. Without a simple circuit configuration, the standby operation can be performed at different timings of the same channel. Therefore, the number of channels occupied when performing a standby operation while holding the phase information while performing synchronization acquisition by connecting to a plurality of wireless terminals is reduced.

[0012]

Embodiments of the present invention will be described below with reference to the drawings. In the present embodiment, as an example of the wireless connection device, a TDMA-TDD scheme (ARIB STD)
An example of a configuration applied to a mobile telephone terminal using the communication protocol of -28)) is shown. This mobile telephone terminal (PS)
After connecting to the public wireless base station, it can connect to other mobile telephone terminals on its own side, such as in a building, as another wireless terminal, and transfer data to other mobile telephone terminals to which it is connected. is there. FIG. 1 is a block diagram showing the configuration of the protocol unit of the mobile telephone terminal in the embodiment.

The protocol section of the mobile telephone terminal includes a radio section 1, a master demodulation section (DEM0) 2, and a sub demodulation section (DE).
M1 to M3) 3, FIFO (first in-first out) memory 4, UW (unique word: unique word (synchronous word)) detection unit 5, TCH (traffic ch)
annel: an information channel) detection unit 6, a symbol counter 7, a subclock symbol counter 8, a synchronization detection unit 9, and a free-running symbol counter 10.

The master demodulation unit (DEM0) 2 and the sub-demodulation units (DEM1 to 3) 3 perform demodulation corresponding to each channel (slot). In this example, TDMA-T
A total of four demodulation units are provided corresponding to the four channels of the DD system. The FIFO memory 4 functions as a phase difference absorbing unit, and absorbs clock jitter (shift from a reference clock phase) between the plurality of sub-demodulation units (DEM1 to DEM3) 3.

The UW detection unit 5 and the TCH detection unit 6
Data detection in the slot based on the MA-TDD communication protocol is performed. For example, after detecting a 32-bit unique word (UW) and a 4-bit channel identification (CI) in a slot, field information (the type of the next channel (data content), etc.) is identified. Also,
Identification of whether the channel is a control channel (CCH) or an information channel (TCH) is performed.

A symbol counter (first symbol counter) 7 is used in the master demodulation unit (DEM0) 2, and is a subclock symbol counter (second symbol counter).
Reference numeral 8 is used for the sub-demodulation units (DEM1 to DEM3) 3. In the symbol counter 7 and the subclock symbol counter 8, phase information at the time of data capture is set.
Symbol bits are counted. After the detection of the unique word, the count value is reloaded to each of the demodulation units (DEM0 to DEM3) 2 and 3, and the respective phase information is held.

The first synchronization acquisition means is configured to include the master demodulation unit (DEM0) 2 and a symbol counter 7. The second synchronization acquisition means is configured to include the sub demodulation units (DEM 1 to 3) 3 and a sub clock symbol counter 8. The symbol counter 7 also functions as a phase control unit, and sets a flywheel state described later. The wireless unit 1 functions as a transmitting unit and a receiving unit.

The synchronization detector 9 detects whether or not the synchronization of the demodulated signal has been established. When synchronization is established by this detection, it is determined that the received data is valid. The free-running symbol counter 10 operates at, for example, 19.2 MHz, and each demodulation unit (DEM0 to DEM0)
3) Always operate independently without receiving the phase information for which synchronization has been performed by 2 and 3.

The mobile telephone terminal configured as described above,
When performing location registration for connection with a wireless base station, first,
Data acquisition is performed by the radio unit 1 and the master demodulation unit (DE
M0) 2 to establish phase synchronization. The phase state is set to a flywheel state, and control information is transmitted to another mobile telephone terminal. Here, the flywheel state is
Once synchronization with the public wireless base station is established, the demodulators (DEM0-3) and 3 hold the phase information in the symbol counter 7 (so as not to shift greatly). A state in which synchronization is not performed. At this time, it is possible to perform synchronization acquisition of another mobile telephone terminal on the same channel without performing other operations such as a synchronization pull-in operation and an intermittent reception operation while retaining the phase information.

When transmitting control information to another mobile telephone terminal, data from another mobile telephone terminal is captured at different timings on the same channel as that of the radio base station, thereby improving the channel use efficiency of the receiving channel. . At this time, since the sub-demodulation units (DEM1 to DEM3) 3 need to capture data at different clock phases, the sub-demodulation units (DEM1) are provided by the FIFO memory 4 provided as hardware.
3) Absorb the clock phase difference in 3. That is, at the time of writing data to the FIFO memory 4, data is written while sequentially switching the write clock using the clocks of the respective sub demodulators (DEM1 to DEM3) 3 as the write clock. When reading data from the FIFO memory 4, the master demodulation unit (DEM0)
2 is used as a read clock, and each data is read in a state where the phases are matched.

Thereafter, the UW detector 5 detects a unique word (frame synchronization bit), and the TCH detector 6
It is determined whether or not the data is of the communication channel.
The symbol counter 7 counts the symbol bits in accordance with the data capture in the case where the data is captured by the master demodulation unit (DEM0) 2 and reloads the count value to the master demodulation unit (DEM0) 2 after detecting the unique word. The phase information is retained so that the state can be shifted to the flywheel state. Data acquisition after the flywheel state is performed by the sub-demodulation units (DEM1 to DEM3) 3 and the subclock symbol counter 8, and the symbol bits are counted in accordance with the data acquisition timing. The count value is reloaded to the sub demodulators (DEM1 to DEM3) 3.

When the data on the control channel is detected by the synchronization detector 9, the subsequent data is processed as valid data. The self-propelled symbol counter 10
Is used when the operation is performed only by its own clock frequency division without performing synchronization acquisition.

In the TDMA-TDD system, a transmission signal is received from a public radio base station every 1.2 seconds, and transmission is performed at a predetermined transmission timing (transmission slot) using a phase established at this time as a reference phase. Or at the next reception timing (reception slot) to wait for transmission from a communication partner (another mobile telephone terminal or a radio base station).
At this time, the phase is corrected by a transmission signal transmitted from the wireless base station every 1.2 seconds to eliminate a phase shift from the wireless base station.

FIG. 2 is a timing chart showing a state at the time of capturing an absolute channel. Here, the absolute channel is
This refers to the same channel as the control channel for exchanging control signals with the radio base station. Also, the same channel is, by definition, the same channel even if there is some deviation on the time axis.

At the time of connection with the radio base station, the control channel after establishing synchronization by continuous reception is assigned to the first slot as an absolute channel. The first slot 11 (absolute channel) in FIG. 2 indicates that the control information from the public wireless base station has been captured. In order to hold the phase information at the time of data capture, the demodulation unit is changed from the master demodulation unit (DEM0) 2 to the sub-demodulation unit (D
EM1 to 3) and switch to the flywheel state.

Then, the mobile telephone terminal waits for a transmission timing for connecting to another mobile telephone terminal (PS) on its own side, and then connects to another mobile telephone terminal in the fifth slot 12 (absolute channel). To send control information. In the case where some control information is transmitted from another mobile telephone terminal to be connected, the first slot 13 (absolute channel)
To capture data. At this time, since the phase information of the data to be captured is different from the phase information of the radio base station, the data is captured by the sub-demodulation units (DEM1 to DEM3) 3 and the count counted by the subclock symbol counter 8 after the unique word is detected. The sub-demodulation unit (DEM1 to DEM1)
3) Reloaded to 3. By such processing, data acquisition of another mobile telephone terminal becomes possible on the same absolute channel (here, the first and fifth slots).

FIG. 3 is a flowchart showing a channel acquisition control processing procedure. First, the mobile telephone terminal determines whether or not the position registration sequence with the radio base station by the master demodulation unit (DEM0) 2 has been completed (step S1). Here, if the location registration fails, the out-of-service standby operation (SB
The process proceeds to S) (step S2).

On the other hand, if the location registration is successful in step S1, it is determined whether or not there is a connection (PS connection) with a terminal such as another mobile telephone terminal (PS) (step S1).
3). Here, when there is no connection with another terminal, a normal standby operation for the wireless base station is performed (step S4). On the other hand, when connecting to another terminal, the master demodulation unit (DEM0) performs a standby operation on the same absolute channel.
In step 2, the flywheel state is set (step S5).

After waiting for the timing of transmitting control information for connecting to another terminal (step S
6), and sends out this control information (transmission data for PS connection) (step S7). At this time, the phase information of the clock phase that has been synchronized with the radio base station is used as a reference at the time of transmission. Then, data transmitted from another connection terminal is received, and it is determined whether or not the data is captured by any of the sub-demodulation units (DEM1 to DEM3) 3 (step S8). If the data is not captured by the sub-demodulation units (DEM1 to DEM3) 3, the process shifts to a standby operation at the time of PS connection, and waits for transmission data from another connected terminal (step S9).

On the other hand, in step S8, data from another connection terminal is captured, and when a call connection request is made, a process of establishing a call sequence (PS call sequence) with another connection terminal is performed (step S10). Then, at the end of the call, it is determined whether or not to disconnect the PS connection, and the process proceeds to disconnection processing (step S11). When performing disconnection processing,
Returning to step S5, the state is set to the flywheel state, and then the flow shifts to the standby operation at the time of PS connection in step S9, and disconnection is executed. On the other hand, the power supply can be turned off without disconnecting the PS connection.
If the answer is F, the process is terminated.

As described above, in the mobile telephone terminal of the present embodiment, after establishing synchronization with the radio base station, data acquisition is performed in synchronization with the clock phase with the radio base station, and the phase information of the synchronized clock is obtained. Is held in a flywheel state so as not to affect other reception operations, so that control information can be transmitted to other mobile telephone terminals based on the clock phase so that connection can be established. To

At this time, the sub demodulators (DEM 1 to 3) 3
By performing synchronization acquisition with another mobile telephone terminal, and holding the phase information in the subsymbol counter 8 and reloading the count value of the subsymbol counter 8 after detecting the unique word, the clock phase with the radio base station can be obtained. The standby operation for another mobile telephone terminal can be performed without any influence. With these controls, it is possible to perform a communication operation with another connection terminal at a different timing on the same absolute channel based on the phase information of the wireless base station.

When connecting to another mobile telephone terminal, it is necessary to capture data at a different clock phase while maintaining the clock phase with the radio base station.
By providing the IFO memory 4, each demodulation unit (DEM
0-3) Clock phase differences and clock jitters in 2 and 3 can be absorbed, and data can be correctly captured.

Therefore, it is possible to reduce the number of channels necessary for establishing wireless connection in synchronization with a plurality of communication partners, and in the above embodiment, four channels are used for one channel.
Up to three wireless base stations and other mobile telephone terminals can be connected, and only one channel is occupied for the standby operation. Use efficiency can be improved.

In the above embodiment, the TDMA-TD
Although the apparatus of the D system has been described as an example, the present invention is not limited to this, and can be similarly applied to apparatuses of other systems. However, in a device of a system that multiplexes and connects by dividing into a plurality of channels in time, such as a TDMA-TDD system, a standby operation of a plurality of connection destinations can be performed by effectively utilizing one channel. The present invention is more effective.

[0036]

As described above, according to the present invention, when establishing synchronization with a radio base station and connecting another radio terminal such as a mobile telephone terminal, two radios and a channel codec are provided. With a simple circuit configuration,
There is an effect that the standby operation can be performed at different timings of the same channel.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a configuration of a protocol unit of a mobile telephone terminal according to an embodiment of the present invention.

FIG. 2 is a timing chart showing a state at the time of absolute channel capture.

FIG. 3 is a flowchart showing a channel acquisition control processing procedure.

[Explanation of symbols]

 Reference Signs List 1 radio section 2 master demodulation section (DEM0) 3 sub demodulation sections (DEM1 to 3) 4 FIFO memory 5 UW detection section 6 TCH detection section 7 symbol counter 8 subclock symbol counter 9 synchronization detection section 10 self-propelled symbol counter

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) H04B 7/26 A

Claims (4)

[Claims] 1. A wireless connection device that establishes synchronization with a wireless base station and connects another wireless terminal to perform a standby operation, wherein the demodulation unit synchronizes with a clock phase of the wireless base station. First synchronization acquisition means for acquiring reception data, phase control means for controlling the demodulation unit so as not to be synchronized with the clock phase while holding the information on the synchronized clock phase, based on the clock phase Transmitting means for transmitting control information to the other wireless terminal, based on the transmitted control information, different from the other wireless terminal on the same channel as the channel on which the wireless base station has been synchronously acquired. A wireless connection device comprising: a second synchronization acquisition unit that acquires reception data in a demodulation unit in synchronization with a clock phase. A plurality of demodulators for demodulating received data from a plurality of destinations including the radio base station and the other radio terminal, respectively, for acquiring the received data in synchronization with the different clock phases. 2. The wireless connection apparatus according to claim 1, further comprising: a phase difference absorbing unit that absorbs a clock phase difference in a plurality of demodulation units that perform synchronization acquisition for each clock phase. 3. A wireless communication system comprising: a plurality of demodulators for respectively demodulating data received from a plurality of connection destinations including the wireless base station and the other wireless terminal; , The symbol bits are counted while holding the information of the clock phase of the first phase, and the phase information is reloaded to the first demodulation unit.
And a second counter for holding the clock phase information of the another wireless terminal and counting symbol bits, and reloading this phase information to a second demodulation unit. The wireless connection device according to claim 1, further comprising a symbol counter. 4. A wireless connection method for establishing a synchronization with a wireless base station and connecting another wireless terminal to perform a standby operation, wherein the demodulation unit synchronizes with a clock phase of the wireless base station. A first synchronization capture step of capturing received data, a phase control step of controlling the demodulation unit to be in a state not synchronized with the clock phase while holding the information of the synchronized clock phase, and Transmitting a control information to the other wireless terminal; and transmitting the control information to the other wireless terminal. A second synchronization acquisition step of acquiring reception data by a demodulation unit in synchronization with a clock phase.