JPH01276935A - Data transmission system for mobile communication system - Google Patents

Abstract

PURPOSE:To improve the data collection efficiency as the entire system by sending sequentially a retransmission permission signal at a time interval in response to the information representing the length of an excess data to each mobile station sending a retransmission request after the end of reception of a specified packet data from all mobile stations. CONSTITUTION:When a base station 10 sends a polling signal PS in an optional timing at first, each mobile station 20 sends packet data PD11-PD51 at each preset data transmission period based on a reception timing of the polling signal PS. The reference station 10 receives sequentially the packet data PD11-PD51 sent in time division from each mobile station 20 after the transmission of the polling signal PS and stores the data as a monitor data. A retransmission permission signal RS is sent sequentially after the end of reception of a packet data from all the mobile stations. Thus, the delay difference in the transmission timing between mobile stations is not expanded to reduce the transmission end time of the data sent from one mobile station thereby improving the data transmission efficiency of the entire system.

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Industrial Application Field) The present invention relates to a data transmission method used in a mobile communication system such as an MCA system or an AVM system.

(Prior Art) Conventionally, in this type of mobile communication system, when a base station periodically monitors various states such as the location of each mobile station,
For example, using a control channel, the base station (BB
) 1 periodically sends out a polling signal, and each mobile station (
When MB) 2 receives this polling signal, it sends various data such as current location information to base station 1 during the transmission period assigned to it in advance, and each of these data is received by base station 1. I try to remember it.

(Problem to be Solved by the Invention) However, in such a conventional data transmission method, as described above, data from a large number of mobile stations 2 is transmitted to the base station 1 in a time-division manner. The amount of data that the mobile station 2 can send in one polling is limited to a relatively small amount. Therefore, if the amount of data to be sent is large and cannot be sent out in one poll, the mobile station 2 waits for polling that periodically arrives from the base station 1 and divides the data into pieces of a certain length. It had to be sent in multiple parts. Therefore, when the amount of data to be sent is large, it takes a long time to complete the transmission of one piece of data, and as a result, connection control etc. are adversely affected, which is very undesirable.

On the other hand, in order to shorten the time required to complete the transmission of one piece of data, the amount of data that each mobile station 2 can send in one polling is made variable, and the base station 1 polls each mobile station 2 individually. A method has also been considered in which data transmitted from each mobile station 2 is transmitted all at once in one polling.

However, with this method, it takes a very long time to complete data collection from all mobile stations 2, so the data transmission timing between the mobile station with the earlier polling order and the mobile station with the later polling order is different. There was a problem in which the delay disparity became extremely large.

The present invention focuses on this point and shortens the time required to complete data transmission from one mobile station without increasing the delay difference in transmission timing between mobile stations, thereby increasing the data transmission efficiency of the entire system. The present invention aims to provide a data transmission method for a mobile communication system that can be improved.

[Structure of the Invention] (Means for Solving the Problems) The present invention provides a mobile station that includes a base station and a plurality of mobile stations, and that transmits a polling signal from the base station and collects data from each mobile station in a time-sharing manner. In a data transmission method of a communication system, when the polling signal arrives at the plurality of mobile stations, sending data is inserted into prescribed packet data whose length is specified in a sending period previously allocated to the mobile station, and the data is sent out. comprising a packet data sending means, a retransmission request sending means, and a retransmission data sending means, and when the sending data length is longer than one packet length of the specified packet data, the retransmission request sending means retransmits the specified packet data. A request and information representing the length of surplus data that cannot be sent with this specified packet data are inserted and transmitted, and when a retransmission permission signal arrives from the base station after this transmission, the surplus data is transmitted by the retransmission data sending means. Send variable-length retransmission packet data inserted all at once,
and the base station includes retransmission request detection means for determining whether a retransmission request is inserted into prescribed packet data sent from each mobile station after transmitting the polling signal, retransmission permission sending means, and retransmission data receiving means. After receiving the specified packet data from all mobile stations, a retransmission permission signal is sent to each mobile station that sent a retransmission request at a time interval according to the information indicating the length of the surplus data inserted in the specified packet data. are sequentially transmitted, and each time the retransmission permission signal is transmitted, the retransmission data receiving means receives the retransmission packet data sent from the mobile station.

(Operation) As a result, when a polling signal arrives from the base station, each mobile station first sends out data using prescribed packet data with a prescribed length. For this reason, the delay difference in data transmission timing between mobile stations with an earlier data transmission order and mobile stations with a later data transmission order is kept small, allowing the base station to transmit data from all mobile stations in a relatively short period of time. - Enables street collection. Additionally, for mobile stations that have a large amount of data to send and cannot be sent using the specified packet data, the mobile station waits for a retransmission permission signal sent from the base station and inserts the surplus data that could not be sent into the variable-length retransmission packet data. and send them all at once. Therefore, even if the amount of data to be sent is large, all of this data will be transmitted during the retransmission process described above, making it possible to relatively shorten the time required to complete the transmission of one piece of data, thereby reducing data collection for the entire system. Efficiency can be increased.

(Embodiment) FIG. 1 shows the configuration of a base station and a mobile station to which a data transmission system is applied in an embodiment of the present invention.
indicates a base station, and 20 indicates a mobile station.

First, the base station has a transmission control section 11 and a transmission section (Tx) 12.
and a receiving section (Rx) 13, and transmits and receives data via a switch 15 and an antenna 16. The control unit 11 has, for example, a microcomputer as a main control unit, and in addition to polling control means, packet data reception control means, etc., retransmission request detection means 11a, retransmission permission sending control means 11b, and retransmission data reception control means. means 11c. First of all, the retransmission request detection means 11a detects whether a retransmission request is inserted into the packet data sent from each mobile station after the polling signal is sent. The retransmission permission sending control means 11b is
After receiving packet data from all mobile stations, a retransmission permission signal is sequentially sent to each mobile station that has sent a retransmission request. At this time, the sending timing of the retransmission permission signal to each mobile station is variably set according to information representing the length of surplus data that was previously sent from the mobile station along with the retransmission request and inserted into the packet data. The retransmission data reception control means 11C receives retransmission data sent from each mobile station each time the retransmission permission signal is sent.

On the other hand, the mobile station 20 has a transmission control section 21, a transmitting section (Tx) 22, a receiving section (Rx) 23, a switch 25, and an antenna 26, like the base station 10 described above. Among these, the transmission control unit 21 has a packet data transmission control means 21a as a control function related to data transmission.
, retransmission request sending control means 21b, and retransmission data sending control means 21c. When a polling signal arrives from the base station 10, the packet data transmission control means transmits packet data with transmission data inserted into a time slot assigned to the base station. When the transmission data length is longer than the length of one packet of the packet data, the retransmission request transmission control means 21b includes a retransmission request and the length of the surplus data in the command part of the packet data transmitted by the packet data transmission control means 21a. The data is inserted and sent out along with information representing the current state. The retransmission data transmission control means 21c directs the retransmission packet data with the surplus data inserted to the base station 10 when a retransmission permission signal is sent from the base station 10 after transmitting the packet data with the retransmission request inserted. It is something that is sent out.

Next, the data transmission method of this embodiment will be explained based on the above configuration. In this embodiment, a case will be explained in which the base station 10 collects data from five mobile stations.

When the base station 10 first transmits a polling signal PS at an arbitrary timing as shown in FIG. 4, each mobile station 20 receives a preset data transmission period (time slot) based on the reception timing of this polling signal PS. As shown in FIG. 4, the packet data PDII-PD51
Send out. At this time, the packet data PD has a specified length consisting of a command part and a data part, each consisting of an ID code, a command, and command data, as shown in FIG. be done. By the way, when transmitting the packet data PD, each mobile station 20 inserts a retransmission request command into the command section of the packet data if the length of the transmitted data is longer than one packet length, and The information representing the length of is inserted as command data and sent.

On the other hand, after sending out the polling signal PS, the base station 10 sequentially receives the packet data PDII-PD51 sent in a time-division manner from each mobile station 20, and stores the data as monitoring data.

At the same time, the base station 10 determines whether a retransmission request command is inserted in the command part of each received packet data, and requests the mobile station that sent the retransmission request command to receive packet data from all mobile stations. After the reception is completed, retransmission permission signals R8 are sequentially sent out. For example, now mobile station 1
．． 2.5, all mobile stations 1
After receiving the packet data from ~5, a retransmission permission signal R31°R is sent to mobile stations 1 and 2.5 as shown in FIG.
82 and R85, respectively. At this time, the retransmission permission signals RSI, RS2. The transmission interval of R95 is determined according to the number of packets required to transmit all of this surplus data, based on the information indicating the length of the surplus data that was inserted in the command part of the received packet data along with the retransmission request command. They are set in advance to be spaced apart by an amount of time.

On the other hand, the base station 10 sends a retransmission permission signal R to its own station.
8I, RS2. When R35 arrives, each mobile station 1.2.
5 is retransmission packet data RDII, RD21.5 into which all surplus data has been inserted. RD51 is created respectively, and this retransmission packet data RD11°RD21. RD51
For example, as shown in FIG.
S2. It is sent to the base station 10 from the time when R85 arrives. At this time, if the length of the surplus data exceeds one packet length, the surplus data is divided into a plurality of packet data and inserted, as shown in FIG. 3, and these packet data are continuously sent out.

In response, the base station 10 sends a retransmission permission signal R8I.

Every time R82, R35 is sent, retransmission packet data RD11°RD21. is sent from the mobile station 1, 2°5.
RD51 are received sequentially, and these retransmission packet data R
DII, RD21. The data inserted into RD51 is transferred to the packet data PD11°PD21.
The data is added to the data already received and stored by the PIi 51 and stored. Thus, the collection of data from all mobile stations 1 to 5 by one polling is completed.

In this embodiment, in response to polling from the base station 10, each of the mobile stations 1 to 5 first sends packet data of a specified length, so the base station 10 5 can be received in a relatively short period of time. Therefore, the difference in delay in data transmission timing between mobile stations is reduced. In addition, if the packet data of the specified length cannot send out all the data, the mobile station inserts a retransmission request and information indicating the length of the surplus data into the command part of the packet data and sends it to the base station. Since all of the above surplus data is sent out after waiting for the retransmission permission signal R8 from the station,
Even if the amount of data to be sent is large and the packet data of the specified length cannot be sent out, the surplus data can be transmitted to the base station in a batch for each mobile station. Compared to the conventional method, in which data is divided into predetermined lengths and transmitted, the time required to complete transmitting data from one mobile station can be shortened. Furthermore, in this embodiment, when the mobile station sends a retransmission request, information representing the length of the surplus data is also transmitted to the base station 10, and the base station 10 responds to the information representing the length of the surplus data. Since the transmission interval of the retransmission permission signal R9 is set, the base station 10 monitors the timing at which the reception of the retransmission packet data RD sent from the mobile station ends each time, and thereby sets the transmission timing of the retransmission permission signal R8. This is not necessary, and as a result, control of the base station 10 can be simplified.

Note that the present invention is not limited to the above-mentioned embodiments, and includes, for example, the control procedures and control contents of the retransmission request sending control means, the retransmission permission signal sending control means, and the retransmission data sending control means,
The configuration of packet data, polling intervals, configurations of base stations and mobile stations, etc. can be modified in various ways without departing from the gist of the present invention.

[Effects of the Invention] As described in detail above, the present invention allows a mobile station to transmit specified packet data whose length is specified in a transmission period pre-assigned to the mobile station when a polling signal arrives from a base station. The retransmission request sending means includes a packet data sending means for inserting and sending data, a retransmission request sending means, and a retransmission data sending means, and when the sending data length is longer than one packet length of the specified packet data, the retransmission request sending means In this way, a retransmission request and information indicating the length of surplus data that cannot be sent with this prescribed packet data are inserted into the specified packet data and sent, and when a retransmission permission signal arrives from the base station after this sending, the retransmission data is transmitted. The sending means sends variable-length retransmission packet data into which the surplus data is inserted all at once, and whether or not the base station inserts a retransmission request into the specified packet data sent from each mobile station after sending the polling signal. comprises a retransmission request detection means for determining a retransmission request, a retransmission permission sending means, and a retransmission data receiving means, and after receiving the specified packet data from all mobile stations, the specified packet data is transmitted to each mobile station that has sent a retransmission request. A retransmission permission signal is sequentially transmitted at a time interval according to information representing the length of surplus data inserted into the retransmission packet data, and each time this retransmission permission signal is transmitted, the retransmission packet data is transmitted from the mobile station by the retransmission data receiving means. It is designed so that each of them can be received.

Therefore, according to the present invention, the time required to complete transmission of data sent from one mobile station can be shortened without increasing the delay difference in transmission timing between mobile stations, thereby increasing the data transmission efficiency of the entire system. A data transmission method for a mobile communication system can be provided.

[Brief explanation of the drawing]

FIG. 1 is a circuit block diagram showing the configuration of a base station and a mobile station to which a data transmission system according to an embodiment of the present invention is applied, FIGS. 2 and 3 are diagrams showing the configuration of packet data, respectively, and FIG. 5 is a diagram showing an example of packet data transmission timing, and FIG. 5 is a schematic configuration diagram of a mobile communication system. 10... Base station, 11... Transmission control unit of base station, 1
1a...Retransmission request detection means, 11b...Retransmission data sending control means, 11C...Retransmission data reception control means, 1
2.22... Transmitting section, 13.23... Receiving section, 15
．． 25...Switcher, 16.26...Antenna, 20
...Mobile station, 21...Transmission control unit of mobile station, 21a
...Packet data sending control means, 21b...Retransmission request sending control means, 21c...Retransmission data sending control means, PS...Polling signal, R8...Retransmission permission signal, PD...Packet data , RD...Retransmission data. Applicant's agent Patent attorney Takehiko Suzue G5 Figure

Claims (1)

[Claims] In a data transmission method for a mobile communication system consisting of a base station and a plurality of mobile stations, in which the base station transmits a polling signal and collects data from each mobile station in a time-sharing manner, the plurality of mobile stations transmit the polling signal. packet data sending means for inserting sending data into specified packet data whose length is specified in a sending period pre-assigned to the local station when the sending data arrives; retransmission request sending means for inserting a retransmission request and information representing the length of surplus data that cannot be sent in the specified packet data into the specified packet data sent by the packet data sending means when the specified packet data is longer than the specified packet data; retransmission data sending means for sending variable-length retransmission packet data into which the surplus data is inserted all at once when a retransmission permission signal arrives from the base station; retransmission request detection means for determining whether a retransmission request is inserted in the specified packet data sent from the retransmission request detecting means;
After receiving the specified packet data from all mobile stations, a retransmission permission signal is sequentially sent to each mobile station that has sent a retransmission request at a time interval according to information indicating the length of surplus data inserted in the specified packet data. A data transmission method for a mobile communication system, comprising: a retransmission permission sending means for sending a retransmission permission signal; and a retransmission data receiving means for receiving retransmission packet data sent from a mobile station each time the retransmission permission signal is sent.