US 5,210,751 A · Signal transmission system capable of performing re-transmission control in units of slots

Abstract

In a message-transmitting station, a signal to be transferred is divided into a plurality of time slots, an error correcting/detecting code is added to each time slot, and a re-transmission sequence order number in unit of messages, a re-transmission number and an address designating ID of a terminal device are added to a specified time slot. Then, data of the time slots are transmitted from the message-transmitting station to a message-receiving station. In the message-receiving station, it is determined whether or not any order number is missing, by demodulating and decoding the data unit containing the re-transmission sequence order number and the address, and a re-transmission request signal is transferred in accordance with the result of the comparison between the sequence number included in the demodulated, decoded data unit and the sequence number received last as an indication of the condition in which the data in each data unit has reached the message-receiving station. Further, at least one of any specified and all of the time slots are re-transmitted from the message-transmitting station in accordance with the re-transmission request signal supplied from the message-receiving station.

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Claims5

Dependent claims

A signal transmission system for use in a digital communication system wherein a message is transferred between a central station and a terminal station, with one of said central and terminal stations serving as a message sender and the other as a message receiver at a given time, said system comprising:

means in said message sender for providing a message transfer signal (I') used for transmission of a message by the message sender and which includes:
a sequence number N(S) for controlling retransmission performed in units of one message, a sequence number n(S) for controlling retransmission performed in units of one data unit, and an identification code (ID) of a terminal station;
means in said message sender for providing a retransmission request signal (REJ') used for requesting retransmission of data units by the message receiver and which includes:
a sequence number (N(R))) for controlling retransmission performed in units of one message, a sequence number (n(R)) for controlling retransmission performed in units of one data unit, and an identification code (ID) of a terminal station;
means in said message sender for dividing a message into a plurality of said data units, encoding each of the data units for use by the message receiver to detect and correct errors included therein, if any, and sequentially retransmitting the plurality of data units of said message;
and
means in said message receiver for receiving the message, decoding each of the plurality of data units thereof while detecting and correcting errors included therein, if any, and determining whether the message has been correctly received;
wherein said message receiver includes control means for first checking the plurality of data units of the message by examining the sequence number (N(S)) for controlling retransmission performed in units of one message, the terminal station identification code (ID), and a result of determining whether said message has been correctly received, and when transmitting to the message sender a retransmission request signal (REJ') such that the retransmission request signal (REJ') includes:
a sequence number (n(R)) for controlling retransmission performed in units of one or more messages, and a sequence number (n(R)) used for controlling retransmission performed in units of one or more data units;
and
wherein said message sender, to which the retransmission request signal (REJ') is transmitted, includes retransmission means for first checking the retransmission request signal (REJ') and then starting retransmission of either an entire message in accordance with the sequence number (N(R)) used for controlling retransmission performed in units of one or more messages, and one or more data units in accordance with the sequence number (n(R)) used for controlling retransmission performed in units of one or more data units.

8 more elements

A digital radio communication system for transferring messages between a terminal device and a central device, with one of said central and terminal devices serving as a message-transmitting station and the other as a message receiving station,

said message-transmitting station comprising:
means for providing the following information (a) to (e) to be transmitted as a message in a frame forming circuit:
(a) a message sequence number field as part of the message for identifying a particular message where a plurality of messages are transferred;
(b) a data unit number field as part of the message for identifying data units where one message is transformed while being divided into a plurality of data units;
(c) a signal type field as part of the message for identifying the type of a message;
(d) an address field as part of the message for identifying a transfer destination terminal;
and
(e) a field as part of the message for indicating the number of data units constituting the entirety of the message;
means for dividing the entirety of a message, which contains area added by said providing means, into data units of predetermined length;
means for executing error detection and error correction encoding for each of the data units;
means for transmitting a data unit for which the error detection and correction encoding have been executed;
means for storing contents of each data unit, so as to allow retransmission of each data unit in response to a retransmission request made by the message-receiving station;
and
means for retransmitting only that data unit which corresponds to a data unit number designated by a retransmission request signal supplied from the message receiving station,
said message-receiving station comprising:
means for demodulating a data unit transmitted from the message-transmitting station and executing error correction and error decoding and detection;
means for receiving information W indicating how many data units are used in a message to be transmitted, comparing the number of data units received with W, and determining that the entire message has been received, where W equals the number of data units received, and for informing the message-transmitting station of the completion of message reception when all data units constituting a message have been correctly received;
and
means for receiving information W indicating how many data units are used in a message to be transmitted, comprising the number of data units received with W, and for requesting retransmission of data units, where W is larger than the number of data units received and a data unit not received or incorrectly received has been detected, by informing the message-transmitting station of data unit number corresponding to the data unit not received or incorrectly received.

16 more elements

Dependencies are inferred from the claim text.

Description8,366 words

Summary1,052 words

#1. Field of the Invention

#The present invention essentially relates to a signal transmission system and, more particularly, to a signal transmission system for transferring long messages, such as user packets, in a mobile communication system whose transmission paths have relatively low reliability.

#2. Description of the Related Art

Brief description of the drawings13 figures

#The accompanying drawings, which are incorporated in and constitute a part of the specification, illustrated presently preferred embodiments of the invention and, together with the general description given above and the detailed description of the preferred embodiments given below, serve to explain the principles of the invention.

#FIG. 1 is a block diagram showing a station used as either as a terminal station or a central station in a mobile communication system according to a first embodiment of the present invention;

#FIG. 2 is a diagram explaining the outline of a signal structure used in the mobile communication system;

Detailed description6,966 words

#Reference will now be made in detail to the presently preferred embodiments of the invention as shown in the accompanying drawings, in which like reference characters designate like or corresponding parts throughout the several drawings.

#FIG. 1 is a block diagram showing a station used as either as a terminal station or a central station incorporated in a mobile communication system according to a first embodiment of the present invention. As is shown in FIG. 1, this station comprises a demodulating circuit 11, a decoding circuit 12, a receiving circuit 13, memory circuit 14, a transmitting circuit 15, a coding circuit 16, and a modulating circuit 17.

#FIG. 2 shows the outline of a signal structure used in the mobile communication system. The upper half of this figure shows the message, which is comprised of data W representing the format of the message, an address field A, a control field C. a data field, and the like. The lower half of FIG. 2 explains how the message is divided into a plurality of data units having a predetermined length, and how an error correcting/detecting code (i.e. "check") is added to each of these slots. As is evident from FIG. 2, the first data unit consists of the data W, the address field A and the control field C. Nevertheless, the data W and the fields A and C can be divided into two or more data units. Further, the message can be bit-interleaved. Still further, the data units can be set apart on the time axis, so that they may be transmitted in the form of bursts.

Facts

Application

07/839,031Filed 18 Feb 1992 · continuation in part

Priority

JP 1-24050019 Sep 1989

Granted

11 May 1993

Term ended

18 Sep 2010

Estimated · how

Pre-1995 term; greater of 17 years from grant or 20 years from filing when eligible. Maintenance-fee lapses, terminal disclaimers and statutory extensions have not been checked. The continuity chain may be incomplete; this is not an enforceability determination.

Classification5 codes

H04L 1/1809
Automatic repetition systems, e.g. Van Duuren systems: selective-repeat protocols
H04L 1/007
Systems characterized by the type of code used: unequal error protection
H04L 1/0072
By using forward error control: error control for data other than payload data, e.g. control data
H04L 1/1806
Automatic repetition systems, e.g. Van Duuren systems: go-back-N protocols

Signal transmission system capable of performing re-transmission control in units of slots

Life of this patent

Signal transmission system capable of performing re-transmission control in units of slots

Life of this patent

Life of this patent

Abstract

Drawings

Drawings

Claims5

Description8,366 words

Drawings

Classification5 codes

Life of this patent

Description8,366 words