JPH07509832A - Selective call method - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed description of the invention] Selective call method Technical field of invention The present invention is useful for selective calling systems such as paging systems, especially for high speed alphanumeric messaging. It is about a system that makes it possible.

Background of the invention For convenience of explanation, the present invention refers to CCIR radiobasin (known as POC3AG) Refer to the context of the radio call code No. 1. This CCIR radio page paging code No. 1 is the radio paging code standard group (RC 3G) and published by British Telecom Radio Paging.

The book “The Book of the CCIR Radio” available from London, UK Paging Code No. 1". However, the present invention is not limited to It is also applicable to systems using digital paging codes.

Addendum 1 to the above book contains standard codes used in wide area radio paging systems. Disclose details for formatting. However, for completeness, it is used The signal format comprises a batch structure consisting of a concatenated batch preamble and a continuation. I will do it. Each batch consists of a synchronization codeword and two codewords in total. and 8 frames forming 17 codewords. The code word has There are two types of address code words, each comprising 32 bits: There is a tsage code word. For message code words, 20 bits , that is, the data field is formed by bit 2 and bit 2, and these are Followed by Paritichienokubinoto. Bit 2 for address codewords 19 to 19 are address bits, and bits 20 and 21 are function bits. is used to select the format for decoding the concatenated message codeword. Addendum 1, subsection 4.1 contains 4 bits for transmission of messages in 1O base only. It is stated to use the cut/character and set the function bit to oo. . Subsection 4.2 concerns alphanumeric or generic data formats. Yes, here it is! Using a 507-bit encoded character set and setting the function bit to 1 It is stated that it should be set to 1. Batch structure when sending messages is maintained, specifically to include a synchronization codeword at the beginning of each batch.

Because of this, the message has an address code, as required at the beginning of each folded batch. and the sum of the concatenated message codeword and the synchronization codeword. I can do it. The signal is typically sent out at 1200 bits/second as a two-level signal.

On the other hand, POC3AG code is very widely used by paging operations, Especially compared to regional areas with large radio coverage per paging network transmitter. , the level of wireless traffic in a relatively small wireless coverage area is generally high. In urban areas, numeric messages only, alphanumeric messages only, and alphanumeric messages Sage speed needs to be increased. In practice, it simply increases the bit speed and Keeping one POC3AG frame horizontal means that the period of one frame is paging This means that it is comparable to or shorter than the link establishment time of the receiver.

Additionally, it is economical to provide separate paging devices for urban and regional areas. It's not something I'm interested in.

Summary of the invention An object of the present invention is to improve the message throughput of the selective call system. Ru. The present invention is directed to the form of a batch containing an address signal and/or a message signal. a means for transmitting a digital paging signal and a signal addressed thereto; a base station having at least one selective call receiver having means for receiving; In the selective call system, the base station transmits at least two different message signals. A synchronization code word indicating the type of message is provided for each bar. means for prefixing the synchronization codeword by 1°, and the synchronization codeword is related to the content. the same bit rate for all synchronization codewords, and The transmitter states the selective call receiver in response to receiving the synchronization codeword to perform receive synchronization. Messages addressed at the receiver in batches concatenated with the initialization codeword. It is characterized by being able to receive and decode signals.

The selective calling method of the present invention allows different calls transmitted at exactly the same bit rate and format Several different types of data messages can be sent by using synchronization codewords. can be sent. Selective call receivers can control modulation, bit rate, and frame structure. and/or configure codeword bridges that respond to specific synchronization codewords. Receive messages addressed to a receiver in a particular batch by , can condition itself to play. Fast numbers, letters and For alphanumeric messages, the batch period is the normal POC3AG batch period. is an integer multiple of , so that all selected call receivers are ready and synchronized. A synchronization codeword always occurs corresponding to the moment in time when a codeword is received. It becomes like this. Therefore, if a communication is configured such that the synchronization codeword cannot be decoded, A standard POC3AG selective call receiver, for example, powers down and waits for the next batch. It becomes operational again at the beginning of the chain. The synchronization codeword is These signals are sent once for each address or an integer multiple thereof. based on the knowledge that the selected call can be received and played by a designated selective call receiver; Operators can transmit various types of signals. Furthermore, normal P.

By making one batch have a period that is an integral multiple of the period of the C3AG batch. Frame structures can be made compatible at the time of link establishment.

If desired, each batch may contain a channel number immediately following the synchronization codeword, for example. may include an indicator code. Provide this channel indicator code This enables multi-frequency operation. Additionally, the selective call receiver of the present invention includes: a receiving means, a decoding stage coupled to the receiving means, and a decoding stage coupled to the decoding stage. tilI control means, the control means transmitting one of at least two types of messages. A means for identifying a synchronization codeword representing a message, and a method for determining the synchronization codeword at least a decoding stage so as to be able to decode the type of message signal concatenated with the code. and means for setting the state.

Brief description of the drawing Figure 1 is an explanatory diagram showing the configuration of the selective call system, and Figure 2 is the POC3AG signal format. Figure 3 shows POC5 with alphanumeric codeword format. Batch Structure Description for AG and Enhanced POC3 8G Alphanumeric Signal Format 4 are simplified block diagrams of the paging device.

BEST MODE FOR CARRYING OUT THE INVENTION Identical parts in the figures are designated by the same reference numerals.

The selective call system shown in FIG. 1 includes a base station having a transmitter 12 and a controller 14. ”0, and this controller has a paging device confirmation code (RIC) and procedures for formatting signals to be transmitted, including calls and/or message data. Provide steps. Message bit rate, modulation mode, frame structure and code The word bridge is selected to be suitable for the particular application.

A plurality of selective call receivers (ie, paging devices f) Pi to P4 are provided. these The paging device is movable within and outside the coverage area of the transmitter 12. Ru. Each paging device P1-P4 has a reception area tuned to the frequency of transmitter 12. 16 and a control section that recognizes the RTC of the paging device of the transmitted message. energizing and modifying devices of this reception area, e.g. acoustic, visual and/or Controls the activation of the tactile transducer.

Signal format of POC3AG or CCIR radio paging code No.l For comparison, this will be explained with reference to FIG. Normal asynchronous PO from base station lo C3AG transmissions each have a 576-bit preamble PA, which allows Concatenation of codewords including radio fi cation code (RTC) and data message The paging devices 1Pl to P4 can achieve the bit synchronization that the batch follows. Equipped with a series of bursts. For convenience, the transmission of data messages will be described in detail below. Don't explain. Transmission is performed at 1200 b/s (bits/second) and 2 A level FSK signal shall be provided. Each batch BO, Bl has the same configuration equipment. and a 32-bit code word of 1711I. 1st code word is the synchronization used by the paging device to achieve/maintain word synchronization. The code word is 5YNC. The remaining 16 codewords are paired, and 8 pairs Each codeword is assumed to be a frame Fl through F8. Each paging device has a frame, which assigns its RIC to this frame when paging (called frame, i.e. frame 4, and the others are not transmitted. Ru. Because of this, as part of the POC3AG's unique battery power conversion characteristics, , so that the paging device may first receive a synchronization codeword, and then Enables its receive section 16 for the period of that frame, in this example frame F4. However, other frames, namely frames Fl to F3 and F5 to F For periods of 8, the receive section 16 can be de-energized. In the preamble As mentioned, the paging operator allows the normal POC3AG in this example to Numeric-only, alphanumeric-only, and alphanumeric message servers transmitted to a paging device It is necessary to realize the high speed, ie, 1200 b/s or more.

According to the invention, this request for upgrades can be achieved by batch, frame and Codeword bridges have different enhancements and are different (higher ) bit rate and/or modulation scheme, but the synchronization codeword structure and Standards like POC3AG can be To satisfy the user of the digital paging protocol by transmitting it to the user Can be done. Set the enhance batch period to [9 batches as an integer multiple of the batch period. All currently active paging devices determined periodically by the lowest common multiplex of the period They are activated simultaneously to enable reception of the next synchronization codeword. synchronization code The word itself is decrypted by the paging device for the enhanced paging service. data message that is encoded and used to condition the paging device for subsequent transmission. contain encoded data that enables it to receive synchronization codes, or by a paging device pre-programmed with word and associated data. of the type that causes the paging device to state itself when it is recognized. . The diagram Δ in FIG. 3 is connected to preamble P and connecting batches BO to B9, [This shows the standard POC3AG format, which includes formats such as 30 to B9. each batch A 32-bit synchronization code word 5YNC is provided at the beginning of the signal. I7 no 3 The duration of each batch of 2-bit codewords is at a bit rate of 1200 b/s. It is 0.4533 seconds.

Diagram B shows an example of the batch structure for messages with only enhanced numbers. vinegar. In this example, each connected batch 13NO, 13N1 is 32 bits, 1200 b/s synchronization codeword 5YNCN and 3 each formed by 8 codewords Contains 2 frames. Diagram D shows the flag bits in the address code word. binary (aO, bit 0 with binary value l for the message code word) , bits 1 to 16 for the address, bit 17 for the function bit, and rotation Formed by bits 18 to 27 for the ring redundancy check bits (CRC). (28:I8I]C)f) An example of a codeword bridge is shown. Diagram E shows an example of a batch structure for an enhanced alphabetic message. Connecting batch BAO, B Each of the AIs has a duration of 5 standard POC3AG batches, i.e. 2.266 seconds. Exists for a period of time. As shown in diagrams E and F, each alphabetic batch BAO,B The AI is a 32-bit, 1200b/s synchronization codeword with 5YNCA and Contains 28 frames formed by 8 incremented codewords . Diagram G shows flag bits, bit 0, bits l to 1 for address 8. Bits 19 and 20 for function bits, Bits 21 and 20 for CRC bits formed by bits 31 to 30 and even parity bits (3 2:21BCH+parity) An example of a codeword bridge is shown. Diagram B G to G indicate an example of an enhanced numeric and alphanumeric message structure. But use There are other examples within the Babuchi transverse range of 2.266 seconds depending on the bit rate and modulation plan. It is possible. The following table summarizes one plan.

As can be seen from the comparison of diagrams A, B and E, synchronization code 7 -FSYNCN, 1=(/5YNCA is the standard POC3AG synchronization codeword Occurs simultaneously with 5yNC. This applies to alphanumeric-only messages and numeric-only messages. messages mixed with standard POC3AG messages transmitted at +200 b/s In this selective call system, Nflil frames (N is 5 in Fig. 3) are used. by detecting synchronization codewords transmitted − times with equal integers). A paging device capable of receiving and following address code words. When the RIC of the paging device corresponds to the RIC of the paging device, the concatenated message code word based on the characteristics of the synchronization codeword. It means that it can be adopted. Synchronization code in non-standard format If the word is detected to be present, the standard POC3AG paging Therefore, the next governing standard t3sPo (: SAG batch or the Nth following standard POCs easily de-energizes its receiving section to the beginning of the 8G barge.

Figure 4 shows how a 1200 b/s synchronization codeword can be received at the beginning of a batch. A selective call receiver, i.e., a paging device, comprising a periodically energized radio receiver 20. 11F is shown. The synchronization codeword is decoded in decoding stage 22 and sent to the controller. 24, where it is used to generate the clock signal generator of the basing device. Synchronize 26. If the synchronization codeword is not standard, i.e. 5 YNCN or 5YNCA (Figure 3), the specific information contained therein. information and is used by controller 24 to select the number of modulation levels in the receiver. and the bit rate used for the next message and summarized in the table above. Allow users to select other items of information provided. Alternatively, you can change the controller to another The synchronization code word: can be pre-programmed with any specific synchronization code. The particular codeword is specified by the controller 24 when the codeword is received. condition the paging device using pre-stored information related to the code. 2 400) 1z, 3200tlz, 4800Hz or 6400Hz bit rate Enhanced numeric message, alphanumeric message, or alphanumeric message with The clock signal generator 26 is configured such that the clock bits can be detected synchronously. The frequency is 19200H2, and this is divided into a series of 1t328, 30.32.34 and 36 to supply clock signals to 1/16.1/8.1/6.1/4 and Divide the frequency to 1/3 to 120011z, 2400Hz, 320011z, 4800) 1z or G400) 12 clock frequencies respectively. I will do it. These frequencies are switched by switch 38 under the control of controller 24. One of the selected frequencies is selected and this selected frequency is used as a basis in accordance with the Fg1 frequency at the stage before the decoding stage 22. the relevant part of the programming device, for example the digital filter 23. More beige The coding device P has an RA that records the decoded numeric messages and alphanumeric messages. Equipped with M40. By actuating a suitable key on the keypad 42, the C. is reading the page from RAM40.

D, is supplied to the driver 44 so that it can be displayed on the LCD panel 46. one These alternating transducers are collectively shown in box 48. these transformers The diffuser generates audio, video and/or tactile alerts.

As is known, the paging signal is often transmitted asynchronously in bursts, and the paging signal is The receiver 20 of the tuning device is energized according to a predetermined algorithm to achieve a speed of 1200 b/s. In order to be able to detect the preamble PA with alternating "1" and °0 being transmitted. I will do it. When detecting this preamble, a switch is activated by the controller 24. A circuit 38 is connected to the output of the frequency divider 28, which in particular Narrow the bandwidth of the filter 23. When the preamble is detected, receiver 2o is attached. detects the synchronization codeword. control this code word. Checked by roller 24, this is the standard POC3AG code word. or confirm one of the enhanced formats as described for example with respect to Figure 3. the code word to be recognized. This codeword is the same as the latter one of the initialization code words, the controller 24 may e.g. Switch 38 is actuated to condition the bazing device and dividers 3o through 36. Select output J, then expand the bandwidth of the digital filter 23 as appropriate, and then to receive address and message codewords contained in a batch of do. If the received RTC corresponds to the RIC assigned to paging device P processes the next message as if it had been activated. Alternatively, the user can The standby is performed by the controller 24 which energizes the machine transducer 48. I can do it. 6 Check the synchronization codeword at the start of a new batch and The next batch may have a different formant, bit rate, and modulation format than the previous batch. paging device rII as necessary to be able to receive and process State P. The decrypted message is stored in the RAM 40 and the user These messages are read out and displayed on the LCD panel 46 when the user needs them.

Standard PO in urban areas where users use the Enhanced POC3AG protocol Move to regional areas using CSAG protocol at 1200 b/s bit speed In some cases, no user intervention is required. The reason is that the synchronization codeword The synchronization code most recently received by the paging device that is always at this bit rate This is because it is itself conditioned according to the word.

These messages can be expressed using suitable means, such as binary and alphanumeric for numeric messages. A structure that can be decoded with 5C117-bit characters for alphanumeric and alphanumeric messages. The paging receiver that should be created must be in a format with only two numbers, e.g. and hexadecimal and non-standard signals can be received. Otherwise, the system This is because the bit rate of the synchronization codeword is always the same for system compatibility reasons. Ru.

In one example of the present invention in which several selective call base stations are synchronized, the start of each burst transmission is There is no need to transmit a preamble at the end.

Pages where the user cannot receive the equivalent synchronization codeword, e.g. due to no transmission. When the paging device is switched on, the paging receiver receives a predetermined period of time, e.g. 2 minutes. It becomes energized for a period of time, then becomes deenergized for another predetermined time period, and then In anticipation of the detection of the synchronization codeword, it was energized intermittently for 2.2613 seconds. so that

The details of the paging system must be multi-frequency operation and synchronization codes. For the first codeword following the codeword, each operator has a unique channel indicator CI (diagrams A, B and E in Figure 3) There is. The paging device is preprogrammed with a channel frequency that is effective for this purpose.

tuning the paging device to one of the allowed channel frequencies for a predetermined period of time; For example, if no answer signal is detected for two minutes, the paging device It switches to the channel frequency and continues for the enhancement batch period (2,266 seconds). switch on the receiver and read the synchronization codeword and channel indicator code. Search for the keyword Ic. Synchronization codeword and channel indicator code If the paging device recognizes both the channel frequency and Hold. However, if the above codeword is not recognized, overetching will occur. switches to the other channel frequency and again uses the known channel indicator codeword. Explore de.

Although one example of the present invention has been described in detail in this specification, various numerical values are limited thereto. It's not a thing. The present invention is not limited to the above-mentioned examples, but the gist may be changed. Various modifications and changes are possible within the scope.

0.4533s FIG, 3D FIG. 4 Continuation of front page

Claims (10)

[Claims] 1. Digital in the form of batches containing address and/or message signals means for transmitting paging signals and means for receiving signals addressed thereto; a base station having at least one selective call receiver having stages; , the base station is configured to generate at least two different message signals. Each patch contains a synchronization codeword indicating the type of message. A means is provided to fix the synchronization codeword so that all synchronization codewords are have the same pit rate for the synchronization codeword, and the selective call receiver has the same pit rate for the synchronization codeword. State the selective call receiver in response to receipt of the codeword to receive synchronization codewords. receive the addressed message signal at the receiver in a batch concatenated with the code; 1. A selective call system characterized by being able to decode one or more signals. 2. The message codeword piping in the batch concatenated with the synchronization codeword Specifically, the bit rate of the synchronization codeword is set to be faster than the bit rate of the synchronization codeword. 2. The selective call system according to claim 1, wherein 3. At least one of the two types of message signals The pit speed is at least twice the pit speed of the synchronization codeword. 3. The selective call system according to claim 1, wherein the selective call system comprises: 4. The faster the pit speed of the message signal, the more the code for the frame. Increasing the number of words and the number of frames for a batch The selective call system according to claim 3, characterized in that: 5. When M is an even integer equal to at least 2, the higher pit speed message Claim characterized in that the sage code word is modulated at M level. The selective call method described in 3 or 4. 6. Change address code word format for numeric-only messages to alphanumeric messages. The format of the address code word is different from that of the page address code word. 6. The selective call system according to claim 1, wherein the selective call system is characterized by: 7. Notice that one type of alphabetic codeword is pit-interleaved. The selective call system according to claim 6, characterized in that: 8. Claim characterized in that each batch includes a channel indicator codeword. The selective call system according to any one of items 1 to 7. 9. a receiving means, a decoding stage coupled to the receiving means, and a decoding stage coupled to the decoding stage. control means, the control means controlling one of the at least two types of messages. A means for identifying a synchronization codeword representing a message, and a synchronization codeword. at least the decoding stage is configured to be able to decode the type of message signal concatenated to the 1. A selective call receiver, comprising means for activating a call. 10. The control means generates clock signals having at least two different frequencies. the control means includes means for generating a clock signal, and the control means generates a clock signal by the means for generating a clock signal. To generate a clock signal with the same frequency when the code word occurs 10. The selective call receiver according to claim 9.