A method and arrangement for channel monitor and control

[Detailed Description of the Invention]

The monitor of a channel, the method for control, and the device background art present invention relate to the field of the wireless communications of the alphanumeric message between a remote device and at least one base station. In detail, it is the method and the means of adjusting the arrival communication to a base station, and is related with the method and means which make the minimum the collision between the message and response (acknow+edgments) which were coded on the arrival channel to a base station. This application is a title called l Inboun d Acknowledgment 5tackJ given on February 24, 1987, and relates to U.S. Pat. No. 4,646,082 of a grantor in this case invented by JameSR, Engel, etc. A porter pull type data terminal system is developed, data message communication becomes possible on the conventional radio frequency (RF) link, and they are a remote device and a terminal, At least one base station was combined, and eventually it was combined with the host computer, and became an operation command to a public service establishment etc., and controllable. Such a RF communications system usually operates on two channels (inbound channel), i.e., the arrival channel to a base station, and the start channel (0upsilontboundchannel) from a base station. Thus, although it operates in half duplex mode by a remote device's usually transmitting on the arrival channel to a base station, and receiving on a start channel, using full duplex mode, a base station transmits on a start channel and it receives it on an arrival channel. Operation of such a system of a kind is arranged and controlled by a "system controller" from a fixed end. Although this system controller composes and creates various start transmission, a header and the coded message are usually contained in this start transmission at least as information on a single packet on the channel of a system of operation. Each remote device which receives the start transmission from a base station usually answers (it is required that AC K> should be transmitted.). A base station repeats transmission of the message to a remote device until ACK is received. In the known improving method, using the embedding prohibition signal under start transmission, while a certain remote device performs, it prevents other remote devices beginning interference transmission. The known method of improving the 2nd is effective for preventing simultaneous transmission of a reply signal after arrival response stack (Inbound Acknowledgment 5tack) r and a considerable long prohibition period. In order to perform such a method and a device, there are various difficulties and a possibility that a collision will take place within the circuit scramble system in such RF communication becomes large. If two or more remote devices transmit the 1st problem simultaneously, in the case of at least one and many, both arrival transmission will be lost. The 2nd problem in prior art is that very long delay takes place in advance of transmission of an arrival message, when the status of a start channel is unknown. The 3rd problem arises during standby of a frame synchronization. That is, a message is [ each other ] crowded and the collision with messages, and a message and ACK increases. The outline of an invention Therefore, the object of the present invention is to provide the method of preventing the mutual interference to a collision also in between what kind of kind of arrival transmission, such as ACK to the coded message and the received message, and a means. Other objects of the present invention transmit ACK by a time slot with a specified original remote device, other remote devices continue after a header -- * coding is providing the method of raising the reliability of a system, and a means by making it not transmit the message carried out by a time slot original with AC K. Thereby, the collision with a message and ACK is lost substantially and the collision between messages decreases considerably by not building the message sequence under frame synchronization standby. If it states briefly, as for the present invention, the operator of a remote device will push his own push button type dialog (push-to-talk: P T T) switch, When trying to send arrival communication, when the communication machine of a base station is communicating, it has always intention of a method and a means which are started always again. Each remote device follows the decision-making procedure of the determination of the prohibited state based on the information in the header of the message which there is delay, or the communication machine of the base station was communicating, or was coded with the embedding prohibition signal before the transmission on the arrival channel to a base station. By this prohibited state, as for all other communication apparatus, a predetermined communication apparatus or remote device is a message or a response (ACK> cannot be transmitted during transmission, therefore the collision between a message and ACK or the collision between ACK can be avoided.). Since random delay is used before a remote device tends to transmit a message to the 2nd time by this method, the collision between messages decreases substantially. Brief explanation of the drawings Drawing 1 is a block diagram using the advantage of the present invention of RF communications system which exchanges data with the form of the coded message. the --A [ 2 ] figure is a timing diagram in which each shows the start transmission containing two messages which continue after a header. the --B [ 2 ] figure is a timing diagram showing the relation between the transmitted message, a prohibited state, and a following response (ACK). the -- a relation with ACKI of the succession which attachesC [ 2 ] figure to the last of the transmitted message, a prohibited state, and an arrival message -- the -- what was shown in relation to the timing diagram ofA [ 2 ] figure -- it is . Drawing 3 is a timing diagram showing a relation with the message, the prohibited state, and a plurality of succession ACK which were transmitted. Drawing 4 is a flow figure showing operation of the method of the present invention in detail. Drawing 5 is an expansion block diagram of the remote device shown in Drawing 1. The suitable embodiment of the present invention The block diagram using the advantage of the present invention of RF communications system is shown in Drawing 1. This kind of system is a base station (it leads and transmits the main station and antenna (104) like 102> between communication media like RF channel.) at the form of the message which coded alphanumeric data including a plurality of communication units. It may be contained in the system combined with an antenna (107), and the 2nd base station (106) is a base station (if arranged with 102>, the redundancy which raises reliability will be brought about.). Base station (it may separate from 102> and may further expand a communications area.) A part of base station may be sufficient, it dissociates and uses, and a system controller (108) is a base station (it may use for adjustment of operation between 102> and arbitrary base stations (106).). As a plurality of communication units comprise a plurality of remote devices (110,112*114) and each of a remote device is shown in a figure using the small antenna (116) built in there, it is a base station (it communicates with 102>.). During arbitrary time, it is a base station (102> sends the start transmission shown with reference number 118, and receives the single arrival transmission shown with reference number 120.). Base station (102> contains a receiver, a channel communication module (CCM), and a transmitter (105) at least.) Such a device is marketed as Motorola IsF-5000 base station which has already existed and contains CC M which has Motorola GCC-480. As a system which has one or more base stations, it is marketed in the system controller (108) as Motorola NCR-500 or NCP-3000. Remote device (110,112,114> is KDT-440.) Many models, such as KDT-460 and KDT-840, are marketed from Motorola. These operation manuals corresponding to [ reach and ] the model of above-mentioned Motorola and it are 1303 EastAlgonquin Road, Schaumb urg, and l1linois 60196. Motorola (it can obtain by JE parts.). Many of above-mentioned products are given to Enge l etc. on February 24, 1987, and they are explained to United States patent 4.646th Slavery(ed) by the grantor of the present invention, and No. 082. The data stated to the above-mentioned United States patent are described here for reference. Although the above-mentioned system is explained based on the device shown in Drawing 1, it may be built with the device shown in Drawing 2 of U.S. Pat. No. 4,646,082. This composition is also described here for reference. According to the important feature of RF communications system of the present invention, it sets by the contents of data, If it is both data and an analog signal only in case of a system, a remote device will receive the start transmission from a base station, respectively, and will answer by the message answered or (ACK) coded in the arrival transmission containing a header and the coded message. The various combination and situations of the signal which happens to within a time are well known, when various time lines shown in Drawing 2 are seen. the -- ifA [ 2 ] figure is seen -- start transmission -- a time line (it is shown along with 202> and the time line has a sequence of two messages to which the header is attached in front, respectively.) A header and message #1 which were coded Please care about that the embedding prohibition signal which happens regularly exists inside (MES, 1). These signals are shown in the bracket described as the embedding prohibition bit. Ah to which these bits will happen if these "marks" will be 1 and it will be zero -- near time is shown. The prohibited state bit (ISB) is embedded in the coded message following a header, and may be embedded at a part or all of the header. In a suitable example, the input data buffer is used and all the Iriki bits are serially inputted into a matrix (7x16) there till the variable continuation time of the coding message given to small Order: b17, b18, ""b31, and B-52b97- 98 b A bit shown with a capital letter of B111 and b112 above is secured to IS B. In a suitable example of the present invention, three ISB(s) received at the end among these are used. All the 1 shows activity of an arrival channel. All the zero show un-working of an arrival channel. That with which 1 and zero were mixed shows that in which the activity situation has not become settled. Other devices can also be used. Two pointers are used within the above-mentioned matrix. That is, it is with the input data buffer pointer which decides on the place where the next data byte is stored, and the ISB pointer in which the last thing is shown among the three newest ISB(s). the [ next, ] --B [ 2 ] figure -- a time line (the prohibited state expressed from block T1 along with 204> is shown.) it understands immediately -- as -- this prohibited state -- the -- as shown inA [ 2 ] figure, it is based on the information in the embedding prohibition signal in the given start transmission, and a header. Between this prohibited state T1, all the two or more remote devices are forbidden except for what answers message #1. Remote device #1 of specification to which the message is addressed is a time line (it answers to reception of the message shown by the arrival transmitting block to which ACK shown on 206> and a label were attached.). thus, when the arrival transmission to a base station is not advancing, if message #1 from a base station is received, as for sending a response to a base station immediately, Ming will come out of remote device #1. Moreover, information is included in a header, the length of message #1 is told to all the remote devices, and the block of long time is secured from the period of ACK predicted at the point within a time expressed by B. the [ next, ] --C [ 2 ] figure shows a different situation. Here, a prohibited state is extended and it is a prohibited state time line (it starts at early time as shown by H at the time on 208>.). This prohibited state passes interval T1 of time, and continues to the point of D, and it ends it at the point of M. Extension of this prohibited state takes place, when an arrival message is detected by the base station, and it warns not to transmit till the end of this arrival message of the embedding prohibition signal in start transmission to a remote device. And the preparations to response ACK1 predicted shown on an arrival transmitting time line (210) are made. in each above situation -- the [ namely, ] -- the [C / 2 / figure and ] -- inB [ 2 ] figure -- the -- the start transmitting time line (the same reference character as receiving, when [ same ] it corresponds to 202> is used.) shown inA [ 2 ] figure A different situation is shown in Drawing 3. Here, it is a time line (as shown in 302>, in start transmission, the sequence of many messages is sent in order.). When it assumes that a start message exists, contract worker 2 who a prohibited state is set to ON as shown on a time line (304), and ends at the R time is further contained. In this situation, the arrival message ended at the 9 times is contained in arrival transmission received by the base station, and the prohibition release delay by which D time is extended continues after this message. Then, a plurality of 80K which will be transmitted as a result of much message 1-N is sent in an order shown in a figure. That is, ACK2 ends ACKI in this side at the R time following the AC Kl back. Thus, this situation is since stack interval (stackinterval) is shown, it is this at the end time of the arrival transmission to a base station and it is produced, The time slot to ACK from the 2nd remote device is secured, and the adjoining time slot is secured to ACK from the 1st remote device, without colliding. In order to transmit possible, the flow figure of decision making which must be performed within a remote device is shown in Drawing 4. If it starts with a block (402), an operator will push a PTT switch, if you wish transmission of a message. Thereby, decision making in a block (404) is started. Initial delay is set up and a block (404) shows the stage which confirms whether transmission is forbidden during the predetermined delay. Such delay may be based on random delay or other various delay so that I may be understood. If there is delay, by this method, it will stand by until delay is completed. This is a block (406) and it is To. After delay is completed, this method confirms whether new delay has been again set up since the time of checking at the end. This is shown by the return course (407). Block (when there is no delay beyond it within 404>, this method progresses to the stage which confirms whether be while a base station transmits.) This is a block (408). When a base station is not transmitting, this method is judged to be a thing without the present arrival transmission, and lodges the power of transmission in this predetermined remote device. This is a block (410). However, when judged with a base station transmitting by block (408), in this method, a prohibited state is judged based on a prohibition signal or a prohibited state bit. This is a block (412). In making this decision, by this method, the three newest prohibited state bits are seen, a prohibited state is determined, and it is judged whether all bits are equal to zero. Permissions [ zero ] are given. This is a block (410). Block (when it is judged that not all the prohibited state bits are logic zero in 412>, this method checks these prohibited state bits next, and it is judged whether all the bits are equal to logic 1.) This is a block (414). When a decision result is Y ES, this method follows random delay. This is one of the predetermined periods from O to 1.5 seconds. This is a block (416). This delay is shown by the course (407). However, as for this method, when the determination in a decision-making block (414) is NO, a remote device delays transmitting permission until the following prohibited state bit is received. This is a block (418). Next, it passes along a return course (407) and starts four step decision-making processes again. Using other various delay, before the transmission whose existing ACK interval is Sen is allowed, it can complete. These delay is required by the length defined beforehand or random length. Finally, Drawing 5 is with the expansion block diagram of the usual remote devices, such as a remote device (110). As shown in a figure, this is a receiver (501>, microcomputer (various interface ports handling 502>, an input, and an output data signal are included.)). A transmitter filter (506), a receiver filter (508), a limiting circuit (510), and A/D A converter (analog-to-digital) (512) is contained. The transmitter with which the key control line of the transmitter is also contained (it combines with 514>, and is shown, this transmitter was combined with the transmitting-reception switch<516>, and this switch is combined with the antenna (116) and the receiver (501).) When collected, the method and the means of controlling communication between a plurality of communication units were explained. Here, a prohibited state is judged based on the prohibition signal before transmission, and the information in a header. By this prohibited state, none of other remote devices can be transmitted while the appointed remote device transmits a message or a response (ACK), but thereby, the collision between a message and ACK or the collision of ACK is avoided. Since random delay is used by this method before a certain remote device sends a message to the 2nd time, the collision between messages also decreases substantially. Therefore, it is clear to a person skilled in the art that other uses and improvement can be performed, without deviating from the range of the present invention. International search report