JPH0730527A - Radio packet transmitter - Google Patents

Abstract

PURPOSE:To attain high speed data communication by providing a frame configuration section in the unbalanced mode in the radio communication system employing the TDMA/TDD communication system of the time division multiple access time division 2-way communication system. CONSTITUTION:The transmitter is provided with a balance/unbalance mode channel CODEC 1 consisting of a balanced mode frame configuration section 6 in which an incoming and an outgoing slots form a 1:1 frame, consisting of an unbalances mode frame configuration section 7 in which an incoming and an outgoing slots form no 1:1 frame, and switches 8, 9 selecting them, and data communication at a higher speed is executed in the unbalanced mode than that in the balanced mode.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a wireless packet transmission apparatus for performing high speed data transmission in wireless communication using a TDMA / TDD access system which is a time division multiple access communication system.

[0002]

2. Description of the Related Art In recent years, a cordless telephone uses an analog communication system and there has been a problem in system reliability such as countermeasures against eavesdropping on a call. However, due to the development of digital signal processing technology, a communication system using the digital communication system Is being considered. As one of the wireless systems, a TDMA system, which is a time-division multiple access communication system, and a time-division bidirectional TDD system.
A TDMA / TDD access method using a transmission method is adopted.

The frame structure of the conventional TDMA / TDD system will be described below. For simplicity of explanation, it is assumed that data is transmitted from the base station to the mobile station. FIG. 14 shows a conventional TD in which each communication channel is transmitted by slots (signal sections) multiplexed on the time axis.
It is an MA / TDD frame structure. There are 8 slots in one frame, and each frame is composed of 4 downlink slots for transmitting data from the base station to the mobile station and 4 uplink channels for transmitting data from the mobile station to the base station. When transmitting data from the base station a2 to the mobile station b22, the base station a2
Information of the downlink TX31 slot of the downlink MR of the mobile station b22
It is received as an X31 slot. Next, in the same frame, the mobile station b22 transmits the uplink MTX31 slot information to the base station a2. At the base station a2
It is received as 31 slots.

FIG. 15 shows a block diagram of a base station of a radio communication system using a conventional TDMA / TDD access system. This wireless communication system is composed of a balanced frame channel codec section 15, a demultiplexing section 2, a transmitting section 3, and a receiving section 4. The data to be transmitted is input to the balanced frame channel codec unit 15, is framed with an upstream / downstream 1: 1 slot configuration, and is transmitted to the demultiplexing unit 2. The signal is assigned to the corresponding channel to be multiplexed and multiplexed. The generated signal modulates a wireless carrier wave in the transmitter 3 and is transmitted as a radio wave. On the other hand, the received radio wave is demodulated by the receiving unit 4, the demultiplexing unit 2 separates the signals for each channel, the framed signal is decoded by the balanced frame channel codec unit 15, and the data is output. To do.

[0005]

However, in the conventional configuration, when performing communication using the TDMA / TDD communication system between the base station and the mobile station, the same number of downlink slots and uplink slots exist in the same frame, and the transmitting station When transmitting a large amount of data in one direction from the receiving station to the receiving station, the receiving station sends a lot of wasteful data to the transmitting station during data reception.

An object of the present invention is to solve the above-mentioned conventional problems, and an object thereof is to provide a wireless packet transmission device which realizes high-speed data transmission.

[0007]

In order to achieve this object, a wireless packet transmission apparatus of the present invention is a TDMA / TDD.
In the communication system, an unbalanced frame configuration unit that forms a frame in which the uplink slot and the downlink slot are not one-to-one is performed by performing slot exchange using the uplink slot as the downlink slot or the downlink slot as the uplink slot in the same frame, It is provided with a balanced frame configuration section that configures a frame in which slots and downlink slots are one-to-one, and a unit that controls switching between a balanced frame and an unbalanced frame.

Further, in addition to the above configuration, a signal detecting means for detecting whether or not there is a received signal for each slot, a packet length calculating section for calculating a packet length according to a receiving buffer for storing data, and one frame with a plurality of slots. Is configured as one slot, and has an unbalanced packet configuration unit that varies the number of packet slots according to the communication state.

[0009]

When TDMA / TDD communication is performed by this configuration, when a large amount of data in one row is transmitted from the transmitting station to the receiving station, the normal balanced frame state is switched to the unbalanced frame state by command communication, and the transmitting station Tells the receiving station how many slots per packet should be transmitted. The receiving station informs the transmitting station of the capacity of one packet that can be communicated from the capacity of the receiving buffer, and performs unbalanced frame communication.

Further, by providing a signal detector for detecting a signal for each slot in a packet, when there is no data to be sent in one packet, an unsignaled portion is transmitted to a slot next to the last data slot at the transmitting station. By making this and detecting this at the receiving station, it is possible to know that the transmission data has ended even during the packet data transmission, and it is possible to cancel the packet transmission mode.

Further, a frame having a plurality of sets of uplink and downlink slots of the same channel can be constructed, and a communication device in which one frame is one packet is also conceivable. The control command and data error check information, which have been conventionally sent for each slot, can be assigned to one slot in the packet, and data can be assigned to all other slots, so that the transmission data capacity can be increased. When communication is performed with this configuration, the communication state deteriorates during data transmission, and the transfer rate deteriorates when data retransmission occurs. In such a case, a control unit that varies the packet length according to the communication state. By providing the processing of 1, it is possible to suppress the deterioration of the transfer rate.

[0012]

(Embodiment 1) An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is an explanatory diagram showing a TDMA / TDD frame structure of one packet, a plurality of frames and a plurality of slots according to the present invention. In this figure, a1 shows a frame structure of a base station, b11 is a mobile station allocated to a channel 1 (CH1) slot in the frame, b12 is a mobile station allocated to a channel 2 (CH2) slot in the frame, b13 is a mobile station assigned to channel 3 (CH3) slot in the frame, b14 is channel 4 in the frame
The frame structure of the mobile station allocated to the (CH4) slot is shown.

When data is transmitted from the base station a1 to the mobile station b12, channel 2 downlink slot TX in frame 1
11 is transmitted, and this is received by the mobile station b12 as the MRX11 slot. Next, uplink channel 2 in the same frame
Data is transmitted from the base station a1 to the mobile station b12 with the slot as the downlink channel 2 slot TX12. The mobile station b12 receives this as an MRX12 slot. In the frame 2, the channel 2 downlink slot TX13 is transmitted, and the mobile station b12 receives this as the MRX13 slot. Next, in the same frame, the data of the uplink channel 2 slot MTX11 slot is transmitted from the mobile station b12 to the base station a1 and is received by the base station a1 as the uplink channel 2RX11 slot. In this way, by changing one of the two frames to the downlink channel, a transfer rate of 1.5 times can be obtained. Similarly, the transfer rate can be increased to nearly double by changing the ratio of the downlink slot and the uplink slot. The same applies when data is transmitted from the mobile station to the base station.

FIG. 2 is a block diagram of a wireless system using the TDMA / TDD communication frame structure of the present invention. base station
The four-channel configuration of a1, mobile station 1b11, mobile station 2b12, mobile station 3b13, and mobile station 4b14 is shown.

FIG. 3 is a block diagram of a wireless communication system according to an embodiment of the present invention. This wireless communication system includes a balanced / unbalanced frame channel codec 1, a demultiplexer 2, a transmitter 3, a receiver 4, and a controller 5. Data to be transmitted is input to the balanced / unbalanced frame channel codec unit 1. The balanced / unbalanced frame channel codec unit 1 uses a balanced frame mode for framing a slot configuration of up / down 1: 1 and up / down 1
There is a function of switching an unbalanced frame mode for framing a slot configuration that is not paired 1, and switches between a balanced frame and an unbalanced frame according to an instruction from the control unit 5. The data to be transmitted is input to the balanced / unbalanced frame channel codec section 1, framed and sent to the demultiplexing section 2, this signal is assigned to the corresponding channel to be multiplexed, and the multiplexed signal is transmitted to the transmitting section 3. The wireless carrier wave is modulated by and transmitted as a radio wave. On the other hand, the received radio wave is demodulated by the receiving unit 4, the demultiplexing unit 2 separates the data for each channel, and the framed signal is balanced / balanced.
The unbalanced frame channel codec unit 1 decodes and outputs the data.

FIG. 4 shows a detailed block diagram of the balanced / unbalanced frame channel codec section 1. The balanced / unbalanced frame channel codec section is a balanced frame configuration section 6 for framing having an upstream / downstream 1: 1 slot configuration, and an unbalanced frame configuration section 7 for framing having a non-uplink / downstream 1: 1 slot configuration. , Switch 8 and switch 9. Switching between the balanced frame and the unbalanced frame is performed by the control unit 5. When the balanced frame is selected, the control unit 5 sends an operation stop signal to the unbalanced frame configuration unit 7, and the unbalanced frame configuration unit 7 operates. And the switches 8 and 9 are set to the balanced frame side. When the unbalanced frame is selected, the control unit 5 sends an operation stop signal to the balanced frame configuration unit 6, the balanced frame configuration unit 6 stops operation, and the switches 8 and 9 are set to the unbalanced frame side. . The transmission data is frame-coded through either the balanced frame construction unit 6 or the unbalanced frame construction unit 7, and is sent to the demultiplexing unit 2 through the switch 8. On the other hand, in decoding the received signal, the frame code signal separated for each channel is decoded by either the balanced frame configuration unit 6 or the unbalanced frame configuration unit 7, and the data is output through the switch 9.

Next, an embodiment of the control sequence of the above-described wireless packet transmission device is shown in FIG. 5, and description will be given using the control command of FIG. 6 (a) devised to realize this sequence. Here, the high-speed data transmission mode using the unbalanced frame structure is called a packet communication mode.

The channel in communication for data transmission in the packet communication mode is changed from the balanced frame mode to the unbalanced frame mode. In order to do this, step 11 sends an unbalanced frame mode command SPM from the transmitting station to the receiving station. In step 12, the command confirmation command UA is returned to the transmitting station to inform that the unbalanced frame communication is possible, and the transmitting station and the receiving station shift to the packet communication mode.

Next, at step 13, the information transfer command PI
To send the data of packet 1 to the receiving station. In step 14, a partial packet command PPS indicating the end of data transmission of packet 1 is transmitted to the receiving station. If there is an error in the data received in step 15, the partial slot request command PPR is attached to the transmitting station with accompanying information of PIF indicating which slot is to be retransmitted. If there is no error in the received data, PI that does not include retransmission slot information
F is sent to the transmitting station to inform that the data was normally transmitted to the receiving station. If there is a resend request, step 16
The information transfer command PI3 is used to send the slot for which a resend request has been made to the receiving station.

In step 17, the partial packet command PP
S is sent to the receiving station to inform that the retransmission slot information has been completed, and in step 18, the partial slot request command PP
Send R to indicate that the retransmission slot information has been correctly transmitted. In this embodiment, an error is detected in the data of the packet 1 sent in step 13, and a request for resending the wrong slot is made in step 15. If the data is sent correctly in step 13, the processing of packet 18 is omitted from step 16. After that, in the same way, step 1
From 9 to step 21, the data transmission of packet 2 and thereafter is performed.

After sending the data, in step 22 a balanced frame mode command SABM is sent to the receiving station to request a change from the unbalanced frame mode to the balanced frame mode. In step 23, the receiving station sends an instruction confirmation command UA to the transmitting station in response to this request, the transmitting station and the mobile station shift to the balanced frame mode, and the packet communication mode ends.

As described above, the wireless packet transmission device of the present invention can perform data communication at high speed.

(Embodiment 2) When data transmission is performed using the packet transmission method of the present invention, packet transmission is performed several times, but the data of the last packet transmission rarely fits in the packet without waste. None, if the length of one packet is long, meaningless data must be sent until one packet is filled even though the data to be sent has ended. Therefore, this problem is solved by providing a signal detector.

FIG. 7 shows a block diagram of a wireless communication system according to a second embodiment of the present invention. The wireless communication system of the first embodiment shown in FIG. 3 has a configuration in which a signal detection unit 10 for detecting the presence / absence of a signal is added. The flow of transmission data is as described in the first embodiment. On the other hand, when receiving in the unbalanced frame mode, the received radio waves are demodulated by the receiving unit 4, the demultiplexing unit 2 separates the signals for each channel, and the balanced / unbalanced frame mode channel codec unit 1 combines them. When the signal detection unit 10 detects whether there is a signal by the received signal from the reception unit 4 and the channel synchronization signal from the demultiplexing unit 2 and detects a signal non-output slot, the control unit 5 This is transmitted to the terminal, and it is determined that the data has ended in one packet, and the communication is ended in the middle of one packet.

FIG. 8 shows a frame configuration diagram for explaining the second embodiment of the present invention. FIG. 8 shows base station a1 to mobile station 2b12.
Shows data communication to. TX12 of channel 2 of frame 1 which is the last of the data to be transmitted is sent from the base station (S1), and is received by mobile station 2b12 as MRX12 (S2). Next, at the base station a1, the end of data is transmitted to the mobile station 2
No signal is sent to inform b12 (S3). The mobile station 2b12 detects that there is no signal in the MRX13 slot (S4), knows that the data has ended, ends the unbalanced frame mode, and shifts to the balanced frame mode.

By providing the signal detecting section 10 in this way, the end of data can be detected even during the packet transmission, and it is possible to quickly shift to the balanced frame mode.

(Third Embodiment) FIG. 9 shows a block diagram of a wireless communication system according to a third embodiment of the present invention. The configuration is such that a transmission / reception buffer 11 and a packet length calculation unit 13 are added to the wireless communication system of the first embodiment shown in FIG. When performing unbalanced frame mode communication, the control unit 5 issues an instruction to the packet length calculation unit to calculate one slot length suitable for the reception buffer size, and this is used for balanced / slotted function with slot length variable function.
The size of one packet is set to the unbalanced frame channel codec 13.

An embodiment in which the data size of one packet is determined by the wireless packet transmission device shown in FIG. 9 will be described with reference to the flowchart shown in FIG. This corresponds to steps 11 and 12 of the control sequence shown in FIG. The control command is also newly expanded to include the unbalanced frame mode command SPM of FIG. 6B with SN information indicating how many slots per packet is used and the command confirmation command UA how many slots per packet. The command to which the SN information is added is used for the control sequence.

First, in order to change the transmitting station and the receiving station from the balanced frame mode to the unbalanced frame mode, the number of slots of one packet is calculated from the size of the receiving buffer of the transmitting station, and one packet is m slots. An unbalanced frame mode command SPM added with SN information is sent to the receiving station. (Step 101). Check if the receiving station has the unbalanced frame mode (step 10
2) If the unbalanced frame mode is not installed, the SN that cancels the unbalanced frame mode sends an instruction confirmation command UA of 1 packet and 0 slot to the transmitting station (step 103). The transmitting side confirms that 1-packet 0-slot information has been sent, and cancels the transition to the unbalanced mode. When the unbalanced frame mode is installed, the receiving station confirms the data reception buffer capacity (step 104).
This reception buffer capacity is compared with the 1-packet capacity requested by the transmitting station (step 105), and if the 1-packet capacity does not exceed the reception buffer capacity, it is transmitted that the unbalanced frame mode of 1-packet m-slot configuration is performed. Notify the station (step 106). This is notified by putting the same value in SN and sending the command confirmation command UA. When the capacity of one packet exceeds the capacity of the receiving buffer, the optimal number n of slots of one packet is calculated from the receiving buffer size of the receiving station (step 107), and the unbalanced frame mode of 1 packet n slot configuration is transmitted. Notify the station (step 108).

This is transmitted by putting the calculated number of slots in the SN of the UA and sending the command confirmation command UA.

As described above, the wireless packet transmission device of the present invention having the transmission / reception buffer can automatically adjust the optimum packet size for communication.

(Embodiment 4) Time-division multiple access In the time-division bidirectional communication system (TDMA / TDD communication system), it is possible to have a frame structure having a plurality of uplink and downlink slots of the same channel. A packet communication device is also conceivable. In the conventional balanced frame mode communication method, a control command, data error check information, and data are always assigned to one slot, but in the frame configuration shown above, a control command and data error are assigned to one slot in one packet. Information can be assigned, and data can be assigned to all other slots. This indicates that more data can be sent than in balanced frame mode. The wireless packet transmission device will be described below.

FIG. 11 is an explanatory diagram showing an embodiment of the TDMA / TDD frame structure of one packet and one frame multiple slots of the present invention.

When data is transmitted from the base station a1 to the mobile station b12, channel 2 downlink slot TX in frame 1
21 is transmitted, and this is received by the mobile station b12 as an MRX21 slot. Next, uplink channel 2 in the same frame
Data is transmitted from the base station a1 to the mobile station b12 with the slot as the downlink channel 2 slot TX22. The mobile station b12 receives this as the MRX22 slot. Further, the channel 2 downlink slot TX23 is transmitted, and this is transmitted to the mobile station b12.
And received as MRX23 slot. Next, in the same frame, from the mobile station b12 to the uplink channel 2 slot MTX2
Data of one slot is transmitted to the base station a1 and is received by the base station a1 as an uplink channel 2RX21 slot. In this way, the configuration is such that the uplink channel within the same frame is changed to the downlink channel. The same applies when data is transmitted from the mobile station to the base station.

With such a packet structure, the control data and data error check information sent for each slot are added one by one in one packet, so that the transmission data capacity can be made smaller than the conventional frame structure. You can increase.

FIG. 12 shows a detailed block diagram of a channel codec section for realizing a TDMA / TDD frame structure in which one packet is one frame and is composed of a plurality of slots.

This channel codec section is a balanced frame configuration section 6 for framing, which has a slot configuration of 1: 1 for uplink / downlink explained in FIG. 4, and 1 for not 1: 1 for uplink / downlink.
An unbalanced frame packet configuration unit 14 that configures a packet as one frame with a plurality of slots, and switches 8 and 9
It is composed of. Switching between the balanced frame configuration unit 6 and the unbalanced frame packet configuration unit 14 is performed by a command from the control unit 5. When the balanced frame mode is selected, the control unit 5 sends an operation stop signal to the unbalanced frame packet configuration unit 14. Is sent, the unbalanced frame packet construction unit 14 stops its operation, and the switches 8 and 9 are set to the balanced frame unit side. When the unbalanced frame packet mode is selected, an operation stop signal is sent from the control unit 5 to the balanced frame configuration unit 6, the balanced frame configuration unit 6 stops operation, and the switches 8 and 9 switch the unbalanced frame packet configuration unit. 14 side is set. The transmission data is coded through either the balanced frame construction unit 6 or the unbalanced frame packet construction unit 14 and sent to the demultiplexing unit 2 through the switch 8. On the other hand, in decoding the received signal, the frame code signal separated for each channel is decoded by either the balanced frame configuration unit 6 or the unbalanced frame packet configuration unit 14 and the data is output through the switch 9.

When data is transmitted with this one-packet configuration, the efficiency of data transfer is reduced when a request for resending one-packet data frequently occurs due to deterioration of the communication state.

Processing for varying the number of slots in one packet according to the communication state will be described with reference to the flowchart shown in FIG.

The transition sequence to the unbalanced frame packet mode is completed, and the receiving station resets the received data error counter (step 201). Next, data of one packet m slot is transmitted from the transmitting station to the receiving station (step 202), and it is checked whether or not this data has an error (step 203). If there is no error, a request for transmitting the next data is sent to the transmitting station. Perform (step 204). When an error is found in the data, the received data error counter is counted by 1 (step 205), and it is confirmed whether the number of error occurrences has reached a predetermined value K times (step 206). If the number of times has not reached the predetermined number of times K, the transmission station is requested to retransmit the data in the one-packet m-slot configuration (step 207), and the transmission station shifts the processing to step 202. The number of error occurrences is the default number K
When the number of times reaches the number of times, the 1-packet n-slot configuration is changed [the number of slots is m> n] (step 208), the transmission station is requested to change to the 1-packet n-slot configuration, and the data is retransmitted by this configuration. Request (step 209). The transmitting station changes to one packet n slot configuration (step 2
10) Retransmit the data to the receiving station with this packet configuration.

As described above, by providing the unbalanced frame packet mode, more data can be sent than in the balanced frame mode, and even if the data transfer rate deteriorates due to the deterioration of the communication state, this communication state is maintained. It is also possible to suppress the deterioration of the transfer rate by providing a packet configuration unit that changes the packet size accordingly.

[0042]

As described above, according to the present invention, TDMA / TD is used.
By providing an unbalanced frame mode for exchanging an upstream slot and a downlink slot in the D communication system, the wireless transmission device can realize a superior wireless packet transmission that can increase the transfer rate as compared with the balanced frame mode.

[Brief description of drawings]

FIG. 1 is a frame configuration diagram of a wireless packet transmission device according to a first embodiment of the present invention.

FIG. 2 is a conceptual diagram of a wireless system of the present invention.

FIG. 3 is a block diagram of a wireless communication system according to a first embodiment of the present invention.

4 is a detailed block diagram of the balanced / unbalanced frame channel codec of FIG.

FIG. 5 is a control sequence diagram of the wireless packet transmission device according to the first embodiment of the present invention.

FIG. 6 is a control command diagram according to the first embodiment of the present invention.

FIG. 7 is a block configuration diagram of a wireless communication system according to a second embodiment of the present invention.

FIG. 8 is a frame configuration diagram in a wireless packet transmission device according to a second embodiment of the present invention.

FIG. 9 is a block configuration diagram of a wireless communication system according to a third embodiment of the present invention.

FIG. 10 is a flowchart showing a one packet data size determination process in the third embodiment of the present invention.

FIG. 11 is a frame configuration diagram in the fourth embodiment of the present invention.

FIG. 12 is a detailed block diagram of a channel codec according to a fourth embodiment of the present invention.

FIG. 13 is a data transfer sequence diagram in the fourth embodiment of the present invention.

FIG. 14 is a frame configuration diagram of a conventional TDMA / TDD communication system.

FIG. 15 is a block diagram of a wireless device using a frame structure of a conventional TDMA / TDD communication system.

[Explanation of symbols]

1 balanced / unbalanced frame channel codec section 2 demultiplexing section 3 transmitting section 4 receiving section 5 control section 6 balanced frame configuration section 7 unbalanced frame configuration section 8 switch 9 switch 10 signal detection section 11 transmission / reception buffer 12 with slot length variable function Balanced / unbalanced frame channel codec section 13 Packet length calculation section 14 Unbalanced frame packet configuration section 15 Balanced frame channel codec section

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Mitsuhiro Araki 1006 Kadoma, Kadoma, Osaka Prefecture Matsushita Electric Industrial Co., Ltd. (72) Yoshinori Takahashi 1006 Kadoma, Kadoma City, Osaka Matsushita Electric Industrial Co., Ltd.

Claims (4)

[Claims] 1. A balanced frame configuration unit that configures a balanced frame in which the same number of downlink slots and uplink slots exist in the same frame, and an unbalanced frame that configures different numbers of downlink slots and uplink slots in the same frame. An unbalanced frame configuration unit, a control unit that manages slots of the unbalanced frame as packets, and a control unit that controls switching of input / output signals to and from the balanced frame configuration unit and the unbalanced frame configuration unit. Time-division multiple access time-division bidirectional communication wireless packet transmission device. 2. A signal detecting section for detecting whether or not there is a received signal on a slot-by-slot basis and detecting when there is no signal as the end of packet transmission constituted by an unbalanced frame. The described wireless packet transmission device. 3. A reception buffer for storing the transmitted data, and a packet length calculation unit for calculating the number of slots of the packet, wherein the number of slots of the packet is adjusted so that the size of the transmitted packet matches the size of the reception buffer. The wireless packet transmission device according to claim 1, wherein the wireless packet transmission device is variable. 4. The non-balanced packet configuration unit according to claim 1, further comprising, in place of the non-balanced frame configuration unit, one packet as one frame and a plurality of slots configured to change the number of slots of the packet according to a communication state. Wireless packet transmission device.