Automatic retransmission request (ARQ) mode transaction, where a base station determines the status of frames sent to a mobile station

Digital control channel with logic channel for multi-access radio communication

This application is a follow-up part of U.S. Patent Application No. 08/147,254. The title of the invention is "Communication Method in Radio Communication System" filed on November 1, 1993, which is incorporated herein for reference.

The present invention relates to a radio communication system used in multiple modes with a digital control channel, and particularly relates to a cellular TDMA wireless telephone system with a digital control channel.

The growth of commercial radio applications, especially the explosive growth of cellular wireless telephone systems, has forced system designers to find various ways to increase system energy without reducing the quality of communication to an unbearable level by consumers. One way to increase energy is to use digital communication and multiple access technologies, such as TDMA-where digital users are assigned their own time slots on a single radio carrier frequency.

In North America, these features have been provided by a digital cellular wireless telephone system called "Advanced Digital Mobile Phone Service" (D-AMPS) published by the Electronics and Communication Industries Association and the Telecommunications Industry Association (EIA/TIA). The interim standard IS-54B of "Dual Mode Mobile Station-Basic Station Compatibility" has specified some of these characteristics. Because a large number of existing consumer devices can only enable the frequency division multiple access (FDMA) analog domain, IS-54B -54B is a dual-mode (analog plus digital) standard, which has analog compatibility compatible with digital communication energy. For example, the IS-54B standard can provide FDMA audio channels (AVC) and TDMA digital traffic channels (DTC). ) And the system operator can flexibly replace one type (digital or analog) with the other (digital or analog) to cope with the changing traffic patterns that occur between digital or analog users. AVC and DTC use a frequency of almost 800 megahertz (MHz) to generate a frequency-modulated radio carrier signal for its radio channel with a spectrum width of 3 kilohertz (KHz).

In the TDMA cellular wireless telephone system, each radio channel is divided into a series of time slots, and each time slot contains a data packet from a data source, such as the digital code component of a voice conversation. These time slots are divided into small to large TDMA boxes according to the selected length. The number of time slots in each TDMA information box is related to the number of different users sharing the radio channel. Each time slot of the TDMA box is assigned to a different user, so the elapsed time of the TDMA box is the successive different time slots assigned to the same user.

For example, the consecutive time slots assigned to the same user are usually not sequential time slots on the radio carrier. The consecutive time slots form the users digital traffic channel and can also be regarded as the users Logical channel. As will be described in more detail below, a digital control channel (DCC) can also be used as a communication control signal, and this DCC is a logical channel formed by a series of usually non-sequential time slots on a radio carrier.

According to IS-54B, each TDMA block is composed of six consecutive time slots and its experience is 40 microseconds (msec). Therefore, each radio channel can carry three to six DTCs (for example, three to six telephone conversations), depending on the power rate of the speech encoder and decoder used for digitally encoded calls. Such speech encoders can operate at full power rate or half power rate, and generally use full-rate encoders/decoders until half-rate encoders can produce acceptable speech quality. A full-rate DTC requires twice the time slot than a half-rate DTC in a certain period of time, and under IS-54B, each radio channel can carry up to three full-rate DTCs or up to six half-rate DTCs. Each full-rate DTC uses two time slots of a TDMA block, that is, six time slots of a TDMA block of the first and fourth, second and fifth or third and sixth. Each half-rate DTC uses one time slot in each TDMA block. Within each DTC time slot, 324 bits are transmitted. Among the 324 bits, the main 260 bits are due to the language of the codec including the bits that correct the encoding due to the error of the language output. Output, and the remaining remaining bits are used for guard time and overhead signaling such as synchronization purposes.

We can see that the TDMA cellular system works in a buffer-busy or discontinuous transmission mode; each mobile station only transmits (or receives) its own designated time slot. For example, at full rate, a mobile station may transmit during the first time slot 1, receive during the second time slot, be idle during the third time slot, transmit during the fourth time slot, and transmit during the fifth time slot. Receive, and idle during the sixth time slot, and then it repeats this cycle during the next TDMA block. Therefore, battery-driven mobile stations can be turned off or rested to achieve power-saving functions during non-transmitting or non-receiving time slots. In IS-54B system, a mobile station is not used for transportation and at the same time. When receiving, a mobile station may rest for 27 microseconds (four time slots) for half-rate DTC and approximately 7 microseconds for full-rate DTC (one time slot).

In addition to the voice channel or the traffic channel, the cellular radio communication system can provide paging/access between the base station and the mobile station, or control the channel to carry information about the preparation of the call, according to the IS-54B standard, such as , There can be 21 dedicated analog control channels (ACC) with predetermined fixed frequencies for transmission and reception at around 800 MHz. Because ACCs usually have fixed channels, they can be quickly found by mobile stations and monitor.

For example, in the idle state (power on but neither transmitting nor receiving calls), an IS-54B system mobile station can receive or start calls through its corresponding base station, and adjust the channel to continuously monitor the strongest control Channel (usually the control channel of the mobile station found on that network at that moment). When an idle mobile station moves from one network to another, it may lose the "original" inter-network at the end The radio combo of the control channel is tuned into the control channel of the new network. This initial tuning and subsequent re-tuning of the control channel is done automatically when the known channel is used to find the "best" control channel When an mobile station finds a well-received control channel, it will keep the channel tuned in until the reception quality of this channel starts to deteriorate again. In this way, the mobile station maintains "collaboration" with the system. The ACC documented in the IS-54B standard requires the mobile station to maintain a constant "alert" state (or at least most of the time, for example, 50% of the time) when it is at rest, and at least to keep it open. The power supply of the receiver.

When the mobile station is at rest, it must monitor the control channel to determine whether the control channel sends a paging signal to it. For example, when a general telephone user (ground line) calls a mobile phone user, the call is from a public The switched telephone network (PSTN) is sent to the mobile telephone switching center (MSC) to determine the phone number to be dialed. If the dialed call is correct and valid, the MSC will request some or all of the radio base stations to page and receive the call Mobile stations to send their respective control channel paging signals to the called mobile station. This signal contains the mobile identification number (MIN) of the called mobile station. When each idle mobile station receives a paging signal, it compares the received MIN with its stored MIN. When a mobile station detects that its stored MIN is the same as the sent MIN, it transmits one through a specific control channel. The paging response is sent to the base station, which then forwards the paging response to the relevant MSC.

When this MSC receives a paging response, it selects an unoccupied AVC or a DTC, turns on the corresponding radio transceiver of the base station, and prompts the base station to send a signal to the called mobile station via the control channel, This mobile station tunes into the selected language channel or traffic channel. Once this mobile station tunes into the selected AVC or DTC, the complete linkage of the call is completed.

When a mobile phone user initiates a call, for example, dial a general phone user's number and then press the "Send" button on the mobile phone, the mobile phone will send out the dialed phone number and the related MIN and electronic serial number (ESN) It is sent to the base station through the control channel. This ESN is set at the factory. The "cannot be modified" number is used to prevent the mobile phone from being stolen. The base station sends the received number to the MSC. The MSC first confirms the mobile station, selects an AVC or DTC, and establishes the direct connection of the call in the above-mentioned manner. This mobile phone must sometimes send a confirmation signal.

It is generally understood that this communication system using ACC has several disadvantages. For example, the forward analog control channel specified in IS-54B is not flexible and non-conductive for the functional goals of current cell phones. There is also the issue of battery life of mobile phones, especially certain broadcast messages. The transmission time interval is fixed, and the order in which the information is processed is also fixed and not flexible. In addition, the mobile station must reread the information without changing it, which wastes battery power. These shortcomings can be remedied by providing new formats and procedures. An example is US Patent No. 07/956,640, entitled "Digital Control Channel", which was proposed on October 5, 1992 and is cited in this application. This is for reference. With this type of DCC, each IS-54B radio channel can only carry DTC, or only carry DCC, or a hybrid combination of DTC and DCC. In the IS-54B architecture, each wireless carrier frequency can have more than three full-rate DTC/DCC, or six half-rate DTC/DCC. Or a combination between the two, such as using a full rate plus four half rate DTC/DCC. According to the above application, according to the applicants invention, its functions are further increased. Generally speaking, however, the transmission rate of DCC does not have to be equal to the half-rate and full-rate recorded in IS-54B. The length of the slot is not necessarily the same length, and it is not the same length as the time slot of the DTC. The DCC may be defined in the IS-54B radio channel and may include, for example, each of a series of consecutive TDMA time slots The Nth time slot. In this case, the length of each DCC time slot can be 6.67 microseconds but not 6.67 microseconds. This 6.67 microsecond is the length of the DTC time slot in IS-54B. On the other hand (and does not limit other possible alternative methods), these DCC time slots can be specified by other methods known to those familiar with the art.

As hybrid analog/digital systems become more advanced, the number of analog users will decrease and the number of digital users will increase until all analog voice and control channels are replaced by digital traffic and control channels. When this happens, these currently used dual-mode mobile terminal stations can be replaced by cheaper purely digital mobile station systems, which are unable to scan the ACC in the IS-54B system, which is traditionally used in Europe. The radio communication system, called GMS, is a purely digital system with a 200KHZ bandwidth wireless channel around 900MHZ. The total data rate of each GSM wireless channel is about 270 thousand bits per second, which can be divided into full-rate traffic channels (each traffic time slot can carry 116 bits of code).

In the cell phone system, there must be a set of air interface communication link rules (Protocol) for mobile stations to communicate with base stations and MSCs. This communication link rule is used to initiate and receive cell phone calls.

Just like US Patent Application No. 08/047,452, the name is "Random Access Channel and Access Response Channel Layer 2 Protocol". This case was filed on April 19, 1993, and it is applied as a reference file. Cited in this article, this communication link is commonly known as a layer 2 protocol in the industry. Its function includes the definition or frame of layer 3 information. These layer 3 information can be communicated in mobile stations and cellular switch systems. Layer 3 contacts between peer entities. This physical layer (layer 1) specifies various parameters of various physical communication channels, such as radio frequency spacing, modulation characteristics, etc., layer 2 specifies the skills required to complete correct information transmission, and Comply with physical channel restrictions, such as error detection and correction, etc. Layer 3 specifies the receiving procedure and data processing transmitted through the physical channel.

Between mobile stations and cellular telephone exchange systems (including base stations and MSCs can be roughly illustrated with Figures 1 and 2. Figure 1 graphically illustrates multiple layer 3 information 11, layer 2 boxes 13 and layer 1 channel clusters Information, or time slot 15. In Figure 1, each channel cluster belonging to layer 3 information can include logical channels, and as described above, a channel cluster for setting layer 3 information is usually not on IS-54B carrier On the other hand, these channels can be continuous as long as one time slot ends and another time slot starts immediately.

Each layer 1 channel cluster 15 contains a full layer 2 box and other information, such as error correction information and other regular information used for layer 1 operations. Each layer 2 box contains at least a part of layer 3 information and regular information used for layer 2 operations. Although not shown in Figure 1, each layer 3 information can include various information elements that can be considered as message payloads, identifying the first part of the relative information type, and possible filling data.

Each layer 1 packet and each layer 2 box can be subdivided into multiple fields. In particular, a finite-length data field in each layer 2 box contains layer 3 information 11, because layer 3 information has variable length. The length is determined by the amount of information contained in the layer 3 information. Multiple layer 2 boxes may be necessary when transmitting a single layer 3 information. Therefore, the layer 1 channel cluster may be necessary to complete the transmission of layer 3 information. This is due to the one-to-one communication between the channel pulse and the layer 2 box.

From the foregoing, when more than one channel cluster is required to transmit layer 3 information, these multiple clusters are usually discontinuous clusters on the wireless channel. In addition, these clusters are usually not even continuous logical channels dedicated to carrying layer 3 information.

Because it takes time to receive, process, and respond to each received packet, the packet required for a layer 3 information transmission is illustrated in Figure 2 and as described above in relation to the IS-54B standard, usually the interleaved format is sent .

Figure 2 presents a general example of forward (or downward transmission) DCC is contained in the continuous time slots 1, 2, ... transmitted on a carrier frequency, the time slots 1, 2,..., N... successive Formed in the form of.

Each DCC time slot has a period that may or may not be 6.67 microseconds, which is in accordance with the DCC length of the IS-54B standard.

As shown in Figure 2, this DCC time slot can be further classified into some super boxes (SF). Each super box contains several logical channels carrying various information. One or more DCC time slots can be allocated to the super box. Each logical channel in the box. In Figure 2 an exemplary downward link super box includes 3 logical channels: a broadcast control channel (BCCH), which contains six consecutive time slots for frequent information; a paging channel (PCH), which contains A time slot for paging information; an access response channel (ARCH), including a time slot for channel designation and other information. The remaining time slots in the exemplary super frame of FIG. 2 can be dedicated to other logical channels, such as the additional paging channel PCH or other channels. Since the number of mobile stations is often much larger than the number of time slots in the super box, each paging slot is usually used to call several mobile stations with common characteristics. For example, the last digit of MIN.

In order to complete efficient sleep mode operation and fast network selection, a BCCH can be divided into several sub-channels. US Patent Application No. 07/956,640 discloses a BCCH structure that allows mobile stations to read the least amount of information when the power is turned on (when locked on -DCC) before being able to access the system to make or receive a call. After the power is turned on, an idle mobile station only needs to normally monitor its assigned PCH slot (usually one in each super box), and the mobile station can be idle during other slots. The ratio of the time required for the mobile station to read the paging message to its sleep time is controllable and is a compromise point between call setting delay and power consumption.

Since each TDMA slot has a certain amount of information load, as described above, each cluster typically transmits part of the layer 3 information. In the uplink direction, several mobile stations try to talk to the system in a competitive manner, while in the downlink direction, multiple mobile stations listen to the layer 3 information transmitted by the system. In a known system, any one layer 3 message must use more TDMA channels needed to transmit the entire layer 3 message remote station.

Digital control and traffic channels are desirable. For these and other reasons, it is stated in Patent Application No. 08/147,254, each called "Communication Method of Radio Communication System", which was filed on November 1, 1993 and cited in This is for reference.

For example, they can be made so that the mobile phone has a longer sleep time so that it can have a longer battery life. Although IS-54B provides digital traffic channels, it is advantageous to use digital control channels with greater flexibility. These channels have expansion functions that can increase system functions and promote hierarchical network structures, such as giant networks, micro networks, and pico networks. The structure of the network, etc., the term "giant network" usually refers to a network whose size is comparable to the size of cells in a traditional cellular telephone system. (For example, the radius is at least about 1 km), and the terms "micro network" and "pico network" usually indicate a gradually shrinking network. For example, a micro network may cover a public indoor or outdoor area, such as a conference center Or busy streets, and a pico network may only cover an office aisle or one floor of a tall building. From the perspective of radio communication coverage, the giant network, the micro network, or the pico network may be different from each other, or may overlap each other in order to handle different traffic types or radio environments.

Fig. 3 is an exemplary hierarchical or multi-layered cellular system. An umbrella-shaped giant network 10 represented by a hexagon forms an overlay network structure. Each umbrella network can contain the underlying micro network structure. Such an umbrella network 10 includes a micro network 20 represented by an area contained in a dotted line and a micro network 30 represented by an area contained in a dashed line, where the dashed line corresponds to a line drawn along a street, and Pico networks 40, 50, and 60 cover all floors of the building. The junction of the two streets covered by the micro-networks 20 and 30 may be a dense traffic concentration, so they are the so-called hot spots.

FIG. 4 represents an exemplary radio communication system, which includes an exemplary base station 110 and mobile station 120. The base station includes a control and processing unit 130, which is connected to the MSC 140, and the MSC 140 is connected to the PSTN (not shown in the figure). In the aforementioned US Patent Application and Patent Application No. 5,175,867, the name is "Neighborhood Assisted Handover of Cellular Communication System" and Patent Case 07/967,027, which is named "Multimodal Signal Processing". The application was filed on October 27, 1992, and the above two types are cited in this application by way of reference. The general information of this cellular wireless system is generally known in the industry.

The base station 110 processes many audio channels via the audio channel transceiver 150, which is controlled by the control processing unit 130. In addition, a base station includes a control channel transceiver 160, which can handle more than one Control channel. The control channel 160 is controlled by the control processing unit 130. The control channel transceiver 160 broadcasts control information through the control channel of the base station to the mobile station that locks this control channel. It is generally understood that the transceivers 150 and 160 can be made into a device, just like the audio and control transceiver 170. This transceiver is DCC and DTC used to share the same wireless carrier channel.

The mobile station 120 receives the control channel data through its audio control channel transceiver 170, and then the processing unit 180 evaluates the received control channel data. This data contains data on candidate networks that may be locked by the mobile station. Advantageously, This control channel includes not only the network information related to it, but also the related information of other networks adjacent to this network. This adjacent network is related to the control channel of this network, such as Raith's US Patent 5,353,332 The name of the case "Communication control method and device for radio call" is also used as reference material in the patent case.

As mentioned above, one of the goals of a digital cellular system is to increase the users "talk time", for example, the battery life of mobile stations. For this purpose, the US Patent No. 07/956,640 illustrates a kind of digital advancement. Controlled channel (base station to mobile station), this channel can carry the information type specified by the current analog forward control channel (FOCC), but this type can also make it readable when the idle mobile station locks the FOCC Normal information. When the information changes, the mobile station sleeps at all other times. In this system, some messages are broadcast more than others, and the mobile station does not need to read every message.

In addition, the application number 07/956,640 explains how to specify DCC and DTC in IS-54B. For example, in each TDMA box, a full-rate DCC can use two of the six slots, and one and a half The rate of DCC can occupy one slot. For additional DCC functions, a half-rate or full-rate DCC can replace DTC. Generally speaking, the transmission rate of DCC is not necessarily the same as the half-rate or full-rate in IS-54B, and the length of the DCC time slot does not need to be the same, and it does not need to be the same as the length of the DTC time slot.

Although the above-mentioned communication system has many benefits, and is obviously different from the previous system, in the communication system of the applicant in this case, the maximum power is used to make the system have a long sleep time and also make the system It is free from the influence of noise and interference channels such as the weakening of the Rayleigh channel. The other function is that the applicant's system can broadcast special information to the mobile station without affecting the other performance of the system.

A wireless communication system according to the present invention can eliminate many of the above-mentioned shortcomings.

An object of the present invention is to provide a method for exchanging information with a remote station. The steps of this method include grouping information into multiple consecutive time slots on a wireless carrier signal; and dividing the time slots into multiple consecutive time slots. Super frame (hyperframe), the continuous super frame is grouped into continuous super advanced frame, and a remote station is assigned to one of the time slots in each super frame. This specified time slot is used for searching Used to call a remote station. In addition, each super advanced box includes at least 2 super boxes, and the information sent in the specified time slot in a super box in each super advanced box is in the other super boxes in each super advanced box. The specified time slot is repeated.

Another object of the present invention is that each super frame includes multiple time slots for sending paging information to the remote station, and the time slots used to send paging information in the continuous super high-level frame are classified into multiple consecutive pages. The box, and the time slot allocated in the remote station is once included in each paging time slot. Moreover, each super box may include a time slot constituting a logical channel for broadcasting control information and a time slot including a logical paging channel, and these allocated time slots are included in the time slot constituting the logical paging channel. In addition, the information in the specified time slot can include information to guide the remote station to read the broadcast information, and this information has been coded in accordance with the error correction code, and contains a number of polarized bits. The bit is the reciprocal of the cyclic redundancy check bit generated by the encoding. This remote station, in response to the decoding of multiple bits, can read and broadcast the control information.

On the other hand, the method of the present invention further includes the step of decoding only the specified time slot in the first super frame of the continuous super high-level frame in the remote station if the specified time slot is not correctly decoded. At the same time, the method of the present invention may be included in the remote station, for example, when the specified time slot in the first super frame is not correctly decoded, the step of decoding the specified time slot in other super frames of the continuous super high-level frame. The mobile station will determine whether the specified time slot has been decoded correctly based on the multiple cyclic redundancy check bits contained in the specified time slot. In another aspect, each time slot has a period of approximately 6.67 microseconds, and each super frame has 32 time slots distributed on 96 consecutive time slots on the wireless carrier signal. At the same time, the broadcast control information can include special information, and these special information are included in the time slots of the respective logical special information channels. The time slots of these special information channels are classified into continuous SMS boxes. The SMS box is synchronized to start with the super box.

On the other hand, the present invention provides a method for exchanging information with remote stations. The steps of this method include grouping data into multiple time slots on the wireless carrier channel; and grouping the time slots into multiple super Frame; and send phase data in each slot of each super frame to identify the position of the slot in each super frame. The super frame phase information may be a number that indicates the time of the next time slot that contains frequent information. On the other hand, the present invention provides a method for exchanging frequent information to a remote station. The steps of this method include grouping frequent information into multiple time slots on a wireless carrier signal; grouping other information into other multiple time slots. A time slot, a time slot with frequent information and a time slot with other information are continuously transmitted, and the instantaneous position of the corresponding time slot in each time slot in the next transmission relative to the time slot with frequent information.

In the method of the present invention, the instantaneous position of each time slot can be represented by a count used to indicate the time interval until the next transmission of the time slot with frequent information. In addition, the time interval between continuous transmissions with frequent information is at least an order of magnitude greater than the period of each time slot. In addition, the time slot containing frequent information may include a logical channel broadcasting control information, and the time slot containing other information may include special information in other time slots having a logical special information channel.

In other aspects of the method of the present invention, the time slots of these special information channels are grouped into continuous SMS boxes, and each SMS box may correspond to an opposite one of a plurality of SMS sub-channels. A special message can span at least two SMS boxes in a related SMS sub-channel, and each special message can be encoded according to the relevant encoding method. Another method is that the special information contained in the time slot of the first sub-channel of the SMS sub-channel can be coded according to a first encryption method and the special information contained in the time slot of at least one other SMS sub-channel The information can be coded according to a second code method.

The features and advantages of the present invention can be understood with detailed descriptions and drawings. In the drawings: Figure 1 illustrates multiple layer 3 information, layer 2 boxes and layer 1 channel pulses in a communication system; Figure 2 is a numerical control A generalized diagram of channel DCC. This digital control channel has time slots that have been grouped into super boxes; Figure 3 illustrates a typical multi-level cellular system, which uses umbrella giant networks, micro networks, and pico networks; 4 represents an implementation diagram of an exemplary wireless telephone system according to the present invention; FIG. 5 shows the structure of a super block; FIG. 6 shows a logical channel of DCC; FIG. 7 shows the structure of an exemplary TDMA block; 8a to 8c show the format of exemplary slots in the DCC; Fig. 9 shows the data separation diagram before channel coding; Fig. 10 shows the structure of a paging block; Fig. 11 shows the structure of an SMS block; Fig. 12 shows an SMS An example of sub-channel multiplexing; and Figure 13 shows the F-BCCH layer 2 block.

Detailed description of the invention

The following is an illustration using a cellular wireless telephone system, but we will understand that the present invention is not limited to this environment. In addition, the following description is based on the TDMA cellular communication system, but for those familiar with this technology, this invention can be applied to other digital communication systems, such as Code Division Multiple Access (CDMA), This physical channel may be a fairly narrow-band radio frequency (FDMA), a code sequence (CDMA) or a time slot (TDMA) on the radio frequency, or a combination of the above. This combination can include payload language and/ Or data, and is not limited to a certain operating mode, access technology or system configuration.

In one object of the present invention, the communication between the mobile station and the base station is made into a series of different logical blocks. Figure 5 illustrates this forward (from base station to mobile station) DCC frame structure and shows two consecutive super high-level frames (HF), each of which preferably contains its own primary super frame (SF ) And their respective secondary super boxes. It must be understood that a super advanced box can include more than two super boxes.

In Figure 5, it shows three consecutive super boxes, each box contains multiple time slots, these time slots are grouped into logical channels F-BCCH, E-BCCH, S-BCCH, and SPACH, in the following There is a more detailed description. At this point, you can notice that each super box contains a complete F-BCCH information (ie, a set of layer 3 information) in the forward DCC. This set of information uses as many time slots as possible, and each super box is Start with an F-BCCH slot. After the F-BCCH slot or multiple slots, the remaining slots in each super frame may include one or more (or none) E-BCCH, S-BCCH, or SPACH and other logical channel slots.

Referring to Figure 5, especially Figure 6, each downlink (forward) DCC preferably includes a broadcast control channel BCCH and a short message service/paging/access channel SPACH. This BCCH includes a fast BCCH (F-BCCH shown in Figure 5); an extended BCCH (ie E-BCCH); and a short message service BCCH (ie S-BCCH), generally speaking, they are all Used to carry general and system-related information from the base station to the mobile station. This BCCH is one-way, shared, point-to-point, and unanswered. This SPACH includes short message service channel SMSCH, multiple paging channels PCH, and a response channel ARCH. These channels are used to send messages to specific mobile stations related to short message service point-to-point messages (SMSCH), paging messages (PCH), and as described below for trying to access the information. This SPACH is unidirectional, shared, and unanswered. The PCH can be regarded as single point-to-multipoint. In this respect, it can be used to send paging information to more than one mobile station, but in some cases the PCH is point-to-point. ARCH and SMSCH are usually point-to-point, although the information sent by ARCH can be used to contact more than one mobile station. For communication from the mobile station to the base station, the reverse (uplink) DCC includes a random access channel RACH. This ARCH is used by the mobile station to access the system. This RACH logical channel is unidirectional, shared, point-to-point, and responsive. All time slots on the chain are used for mobile access requests, which are based on competition or reservation. Completed. The basis of the reservation is US Patent Application No. 08/140,467, titled "Method for Effective Random Access in Mobile Wireless System", which was filed on October 25, 1993, and is hereby incorporated for reference. The important feature of the RACH operation is that it must receive information from a certain link, so that it receives real-time feedback for each cluster of mobile stations that they send on the link. This situation is called layer 2 ARQ or automatic repeat request on RACH. The information of this downlink preferably includes 22 bits. These 22 bits can be regarded as another dedicated load downlink. Or the down-chain sub-channel dedicated to the up-chain level 2 information. This kind of information flow can be called shared channel feedback, which can increase the circulation of RACH so that the mobile station can quickly determine whether the pulse of any access attempt has been completed. After being successfully received, other aspects of RACH are described below.

The F-BCCH logical channel contains important time-based system information, such as the structure of the DCC, other necessary parameters for the access system, and the E-BCCH change flags are described in detail below. As mentioned above, each super box sends one A complete set of F-BCCH information. -BCCH logical channel carries system information, which is not as important as the information transmitted on F-BCCH; a complete set of E-BCCH information (for example, a set of layer 3 information) can span several super boxes, and It does not need to be aligned with the start end of the first E-BCCH slot of a super box. The S-BCCH logical channel transmits short broadcast information, such as advertisements and various information that are of interest to mobile users. It may even be system operation information, such as the change flags of other logical channels. An important objective of the present invention is that this S-BCCH can separate the general information of the system. This information is transmitted from the broadcast information service (S-BCCH) on F-BCCH and E-BCCH, which can make the system have the greatest elasticity. It is possible to omit S-BCCH and use E-BCCH or F-BCCH to send information, but doing so will delay the operation of important system information, because SMS information will be confused with system regular information.

As for the related SPACH slots, they can be flexibly assigned to SMSCH, PCH, or ARCH channels, based on the transmission header information. The SMS logical channel is used to deliver short messages to a specific mobile station that receives SMS services. The PCH logical channel transmits paging information and other commands to the mobile station, such as the F-BCCH change flag described in US Patent No. 07/956,640. In the following I will describe in more detail how mobile stations are allocated to their respective PCH slots. An mobile station listens to the system transmitted on the ARCH logical channel and responds to the mobile station's successful access to RACH. When a mobile station attempts to access the system, RACH can be used to transmit AVC or DTC assignments.

An important feature of the present invention is that the PCH slot in the primary super box of each super high-grade box can be repeated on the secondary super box of the super high-grade box. This situation is called "repeated occurrence of guaranteed specifications. Therefore, this is the case. Once a mobile station reads the BCCH information, it can immediately enter the sleep mode. When it determines which single PCH slot can be used to monitor paging information based on its MIN or some other distinguishing characteristics, it is therefore correct for the mobile station After receiving the paging message sent in the PCH slot on the primary super box, this mobile station can sleep in the entire related secondary super box, thus increasing the battery life. But if the mobile station cannot be correct When decoding its allocated PCH slot on its primary super box, the mobile station can read the corresponding PCH slot on the secondary super box.

It must be understood that the mobile station can only read the PCH slot of one of its two superframes, either the primary or the secondary one. For various reasons, to see if the PCH slot can be decoded correctly, in this case It can make the mobile station reach the maximum sleep time, and when the mobile station reads PCH Cao from one of its super boxes (for example, the first super box) (for example, the first super configuration), the mobile station can be at least partially During the time to the next (primary) super box, it can monitor other control channels without missing any paging on the first control channel. In fact, the mobile station can even read the paging of another control channel. Slots, so that the network reselection can be completed smoothly, preventing the mobile station from missing any paging when reselecting. We can know that when the two control channels are synchronized, the selection process can occur more easily. This situation occurs at least when the time interval between its two super boxes is already known. This time interval can be in E -Information found on BCCH.

In US Patent No. 07/956,640, it is mentioned that the F-BCCH slot of the continuous super frame carries the same information until the change mark on the PCH slot is changed, and then it becomes different, or changes in a predetermined way. The value of the tag. This feature has been mentioned in the system and method of this application. In addition, E-BCCH and S-BCCH information can span two super boxes on a super high-level box, and sometimes even occupy several super high-level boxes, thus forming the BCCH bandwidth (for example, it is necessary to send a full set of BCCH information). The number of slots) and the time required to send a complete information cycle. The change of the change mark on the PCH slot means that new information will be found on the F-BCCH sent on the next super frame. In this way, once the mobile station reads the BCCH information on the DCC, the mobile station only needs to wake up to read the designated PCH slot. When the change flag of the PCH slot changes, the mobile station knows that he wakes up or stays awake in order to obtain F-BCCH. At this time, the F-BCCH has changed, but if the mobile station determines that the change flag has not changed, the mobile station does not need to Reading F-BCCH will increase the sleep time and battery life of the mobile station.

In the same situation, the F-BCCH slot can contain the E-BCCH change flag, which can indicate that the system has changed the E-BCCH information. For the E-BCCH change flag, the mobile station will stay awake and read the E-BCCH slot. We understand An F-BCCH change mark in the PCH slot on the F-BCCH can indicate the E-BCCH change mark on the F-BCCH slot. If it changes, it means that the new information to be read has appeared. The mobile station is best to read E -Before BCCH, store the E-BCCH change flag value transmitted in the F-BCCH slot. After the mobile station obtains the relevant information (to be determined by a certain operation that the mobile station is engaged in), the mobile station re-reads the E-BCCH change flag. Such an action to update or inspire the E-BCCH information set can be considered as successful, if the E-BCCH change flag remains unchanged before and after the mobile station reads the E-BCCH.

In terms of other features of the present invention, the information is not interleaved between consecutive slots, as described below, but the information can be interleaved between different areas in the same slot, as described below , Downlink information is more advantageous to be encoded with error correction codes to avoid channel interference, such as a whirl rate-1/2 code. It is best not to use "too many" numbers, such as the 1/4 code of the gyration rate, but this is because the number of data bits in any channel is very small. And usually such coding is unnecessary because BCCH information is repeated in each super box, and some services can use ARQ. However, ARQ cannot be used for BCCH and PCH. Of course, it is more advantageous to use a single code because it reduces the complexity of the device, so to achieve sufficient protection, this reduced code can be combined with the PCH guarantee specification to repeat the time provided. Variety to complete. This combination is beneficial to improve the performance of the sleep mode of the system.

Combining the above features in a communication system can prevent the system from being affected by errors, while generally speaking, it can have a longer mobile sleep time. We can feel that the guarantee repetition in the PCH slot promotes the diversity of time and makes the system avoid errors caused by Rayleigh Fading, which is caused by 1/4 of the old system. This is caused by rate coding and interleaving between clusters (of course, ensuring specification duplication is not optional for language slots). The present invention combines the above-mentioned features to form a communication system that allows mobile stations to sleep in all PCH slots in the time of its corresponding secondary super box after finishing decoding the PCH slot of its primary super box. We It is known that the designated PCH slot of a mobile station is separated by several times the time of such a slot (6.67 microseconds).

The BCCH information sent in one or more slots of the DCC contains information about the service system and the ideal behavior of the mobile station required to operate the system. The general information usually includes the following: 1. The paging slot assigned by this mobile station; 2. Whether this mobile station is not allowed to make or receive calls through this base station or is restricted to only emergency calls; 3. The power level used when transmitting information to this base station; 4. The identification of the system (whether it is a landlord system or a visitor system), 5. Whether to use an equalizer to compensate for the distortion and distortion caused by the wireless channel transmission signal Attenuation effect), and 6. The position of the DCC (frequency, time slot, time interval of the super frame of other DCC relative to the super frame of the current DCC) of other adjacent base stations. Sometimes the DCC signal received by the base station is too weak or other reasons. For example: the signal of another base station is stronger than the signal of the above-mentioned base station. You can choose a DCC of the neighboring base station. When a mobile station locks the DCC , This mobile station first reads the general information to determine the system's identification, call restriction, etc.; the DCC location of this neighboring base station (such as frequency, time slot, etc., these DCCs can be found from the above). The relevant DCC frequency is stored in the memory, and the paging slot in the super frame (assigned to the DCC slot of the paging frame owned by this mobile station), after storing the relevant DCC frequency in the memory, The mobile station enters sleep mode. Then, depending on the type of the paging frame of the mobile station, once each super-advanced frame reads the designated paging slot, the mobile station will be "awake", and then the number will go back to sleep.

The F-BCCH information transmitted in each super advanced frame makes the mobile station read the other information of the super frame, access the system or quickly find the most suitable service network. This is the first time the DCC is locked. For example, some basic information about the low-level structure of DCC must be read by the mobile station first and then other information in the super box. The basic information includes, for example: a super frame period (the number of DCC slots), whether the DCC is half-rate or full-rate, the format of the DCC (the slot in the TDMA frame), the location of other BCCH channels, and the number of PCH designated Location, and whether the mobile station should use an equalizer. Other types of information should be sent frequently, so that the mobile station can quickly accept or reject a DCC, such as whether a network is available and data energy (a certain network may be used by a certain group of users or cannot be processed from a certain DCC. A mobile station transmits information), system and network identification, etc. These data can be transmitted in each super box. In order to speed up system access, mobile stations only need to read the F-BCCH system access rules.

E-BCCH is assigned a fixed number of slots on each super box controlled by the system, but a long period, or a group of information, can be distributed in several super boxes when transmitted by E-BCCH, so each super box The number of E-BCCH slots on the frame may be much less than the number of slots used to carry long periods, and also much less than the number of the group information. If there are not enough E-BCCH slots on a super frame to accommodate For all E-BCCH information, use the next super box. Through the F-BCCH mobile station as described above, the number and location of the E-BCCH allocated to each super frame are notified. In the F-BCCH (or S-BCCH) currently in use, an E-BCCH start mark is transmitted to notify the mobile station of the starting point of the E-BCCH information contained in the super box in use.

Using this E-BCCH long and/or scattered information can be transmitted on the DCC without affecting the organization of the super box, such as PCH allocation or DCC capacity. For example, the DCC list of neighboring base stations can be transmitted on E-BCCH. Such lists must be transmitted in multiple slots, and these slots can be spread across the E-BCCH of several super boxes without having to occupy most of a super box. In this way, BCCH often weighs the need for a large number of information. Paging slots (and consequently increased paging capacity).

Layer 1 format

Figure 7 shows an exemplary organization type of information transmitted on a wireless channel according to the present invention. This organization includes channel clusters or time slots. This organization type is similar to that specified in IS-54B. Yes, this is composed of continuous time-slots on the wireless channel, with a TDMA frame for every 6 slots and a TDMA segment for every 3 slots. In this way, a radio carrier frequency can maintain multiple separate channels. Each TDMA frame has a time length of 40 microseconds, and can maintain 6 half-rate logical channels, with 3 full-rate logical channels, or as described in the table below to combine a full-rate channel with 2 and a half-rate logical channels. Each slot of the rate channel exchange has a time length of 6.67 microseconds and carries 324 bits (162 symbols). Their positions in each slot are traditionally numbered 1 to 324 consecutively.

<tables><img file="TW252246B_D0001.tif" /></tables>As explained above, each super box includes a predetermined number of DCC continuous time slots, because a complete F-BCCH information set is transmitted by one super box, and because the first slot of each super box is one F-BCCH slots, each super frame is the interval between this type of starting F-BCCH slots. At present, it is better for each super box to be composed of 32 time slots. These 32 time slots are distributed among the logical channels F-BCCH, E-BCCH, S-BCCH and SPACH, as shown in Figure 5 Yes, so the time length of each logical super box is 32 TDMA segment/super box^★20 microseconds/TDMA segment microsecond = 640 microseconds, which usually spans physical time slots on 96 consecutive wireless channels.

The above selection is a balance adjustment based on several factors considered by the present invention to be the most useful at present. For example, with 32 slots, this is an integer power of 2, which simplifies the use of various counters in existing hardware. These counters use binary signal processing. Moreover, the 32-slot super box can balance the capacity of the paging channel (and other channels) with the call setting delay.

For transmitting a certain amount of BCCH information, using a longer super frame can increase the paging capacity, but this action will also increase the average setting delay, while using a shorter super frame can reduce the average setting delay to a considerable extent However, this also reduces the paging capacity and uses a large part of each super frame for general information. All the balances that can be considered are within the spirit of the inventor's invention.

In order to punctuate the position of each time slot in the super box and provide the enhanced sleep function of the present invention, a super box phase (SFP) count, which increases by one for each full-rate DCC slot in a super box. The count is included in each downlink DCC slot as part of the broadcasted information. The SFP value of the first slot (F-BCCH slot) of each super frame can be assigned a value of 0; the SFP value of the next slot of the same logical DCC is 1, and so on.... Therefore, if each super frame in a system has 32 slots, its SFP value increases the modulus by -32, and the SFP value in each slot requires five bits. For a half-rate DCC, only Use half of all modulus values (for example, 0, 2, 4, ... 30) to identify the time slot in each DCC super box.

We can understand that such a modulus-32 increment counter can be replaced by a modulus-32 decrement counter. For a communication system, if a fixed number of time slots is not used, a decrement counter can be used to replace the modulus 32. Incremental counter to indicate the next occurrence of F-BCCH, or other ideal general information. We need to know that the information in a slot must include the relative time of this slot to the next slot that carries important general information, and it is also necessary to let the information indicate where it is a super frame or a super premium frame or page. The starting point of the structure of the box? For example, the boundaries of all box structures are synchronized with the next time slot with important general information, but this synchronization is not absolutely necessary.

In FIGS. 8a and 8b, two possible formats of information in an inverse DCC time slot are illustrated, and in FIG. 8c, the more ideal information format in a forward DCC slot is illustrated. These formats are roughly similar to those used by DTC in the IS-54B standard, but in this application, a new function is added to the field in each slot according to the present invention. In Figures 8a to 8c, the bits contained in each field The number appears above the field.

Generally speaking, the information carried by the slot (layer 2 user data bits) is mapped to the two DATA fields sent in each slot, and in the downlink slot, the encoded SFP value is transmitted in the CSFP field. The field can be used to uniquely identify each slot through the relative position of the slot in the super frame to determine, in the downlink slot, BRI, R/N, and CPE field contains RACH as layer 2ARQ random access data; A similar layer 2 ARQ field can be included in the uplink slot. In the forward DCC (Figure 8c), the DATA field has a total length of 260 bits, the CSFP field has 12 bits, and the BRI, R/N, and CPE fields have a total of 22 bits for shared channel feedback. In reverse DCC, the DATA field length normally totals 244 bits (Figure 8a) or a shortened 200 bits (Figure 8b).

The bits in the G, R, PREAM, SYNC, SYNC+, and AG fields are correctly received in the CSFP and DATA fields in the traditional way, such as synchronization, guard time, and so on. For example, the SYNC field will be equal to the DTC field because this is IS-54B and it will have a predetermined bit pattern. This pattern can be used by the base station to find the starting point of a slot, and SYNC+ The field may contain a fixed bit pattern to provide additional synchronization data to the base station, and the base station will set its receiver increment in the PREAM field to avoid signal distortion.

In Figure 8c, sending the SFP value in the CSFP field in each DCC slot allows the mobile station to find the starting point of each super frame. The SFP value is best encoded with (12,8) code, which is similar to the encoding method of DVCC in the IS-54B standard. Therefore, the CSFP field is preferably 12 bits long, while the unencoded SFP has 8 bits. Yuan. Encoding the SFP value in this way is advantageous because it can handle DVCC with the existing hardware and software in the mobile phone. Moreover, the 4 check bits are best reversed, so that the mobile station can use the data in the CSFP field to distinguish DCC and DTC because CSFP of DCC and CDVCC of DTC do not have a common code. Other methods of distinguishing DCC and DTC are also described in US Patent No. 08/147,254. Due to the importance of SFP to system operation, a mobile station may be able to decode CSFP in several slots in order to maintain correctness, because CSFP in any slot is not well protected by code, and it is not protected by time diversity. It is well protected, just like the layer 3 information in the DATA field.

But when each super frame contains 32 bits, among the 8 unencoded SFP bits, the three most effective bits can be set to 0. It can be understood that the unset SFP bits can be used for other For example, to process super boxes with more than 32 slots in each super box or to use layer 1 power control information. The other three unused SFP bits can be used alone or in combination with other unused (reserved) bits transmitted in each slot to increase redundancy or enhance the SFP's function of correcting error codes. Decide that it is necessary. We also understand that the header data of the layer 2 frame may contain SFP information, instead of the separation layer 1 field as shown.

In addition, in a system with a 32-slot super box, it is currently preferable that the 16 CRC or check bits in the layer 2 box sent by the BCCH slot can be reversed, and the layer 2 box sent by the SPACH slot can be reversed. The 16 check bits in is not reversed. This kind of application check bit method is very advantageous in some cases, for example, when we want to assign the mobile station to another paging slot. For example, if a system has always used 12 slots in a 32-slot super box for BCCH, and hopes to use 13 bits for BCCH, they must be notified in the BCCH slot that they should go to one to monitor another page. After the slot, the mobile station is assigned to the first paging slot. This mobile station obtains such data by decoding 1 or 2 bits to identify the type of bits that can be decoded. But this mobile station also has the disadvantage of reducing bandwidth. In the system of the present invention, when the mobile station sees the inverted CRC bit, it will know that something has been changed, so its response is that it will reread the F-BCCH, which includes the new DCC structure information. Inside.

The information carried by the BCCH slot preferably also includes the count of the super high-level frame and the primary SF indicator; especially as will be described in detail below, these information units are included in the DCC structure information carried by the F-BCCH , When the count of the super-high-level box can show which paging box and the super-high-level box of the higher-level structure of the SMS box are currently being relayed, this is illustrated in FIG. 10. According to the present invention, 4 paging frame levels and/or 4 broadcast SMS sub-channels as described below are provided. The indicator of the primary super box is a variable single bit that can be used to indicate whether the currently used super box in the currently used super advanced box is primary or secondary; when the bit value is 0, the current super box It may be the primary one, and vice versa. In an embodiment of the present invention, the number of super high-level boxes is expressed in a modulo-12 manner.

Figure 9 shows a current preferred separation method for layer 2 user data bits before channel coding. The DATA field in the logical channel BCCH, SPACH and RACH (normal or shortened) is preferably 1/2 Convolution coding of the rate, so the two DATA fields in the forward DCC slot can have 109 clear codes, or uncoded BCCH or SPACH bits; and the two DATA fields in each inverted DCC slot can carry There is a normal 101 clear RACH bits or a shortened 79 clear RACH bits. In addition, the encoded user data bits are preferably interleaved between the two DATA fields in each slot, but the DATA fields in different slots are not interleaved with each other, so that the system of the present invention can be longer. The sleep time and interleaving can be completed in accordance with an appropriate matrix pattern, just like the standard in IS-54B.

Different DCCs can be allocated to different radio channel frequencies, and different numbers of slots can be allocated to the BCCH in each DCC. The layer 2/3 data can be different for each DCC, but this is not necessary. In one embodiment, each DCC includes its own BCCH. In this embodiment, most of the information from DCC to DCC is redundant. This phenomenon causes a loss of paging capacity. In another embodiment, DCC can be It is compiled into a master-slave relationship, where the complete BCCH information is only used by the master DCC; if a mobile station monitors the slave DCC, it will need to change its corresponding master DCC to be slave to obtain the BCCH information. The current preferred method is that each frequency has a full set of BCCH information. In addition, the mobile station often obtains all its BCCH information on the same frequency, just like it allocates PCH channels.

The DCC structure transmitted on the F-BCCH in the first slot of each superframe is the most important information that the mobile station needs to obtain. A favorable DCC structure information includes the data units in the following list:<tables><img file="TW252246B_D0002.tif" /></tables>M=Required O=Optional

As mentioned above, the mobile station usually monitors one of the PCH slots in the super box to reduce power consumption or battery consumption. Some paging messages are longer than the capacity of a single time slot. Each PCH slot has a PCON bit and can be set to cause designated mobile stations to read additional SPACH slots. The number of additional SPACH slots can be F -The parameter PCH_DISPLACEMENT (PCH-displacement) sent by the BCCH indicates that the extra slot to be read is preferably at least 40 microseconds (a TDMA frame) from the designated PCH slot of the full-rate or half-rate DCC. For example, for a full-rate DCC, the mobile station will try to read SPACH by skipping one for each read, up to the number indicated by PCH_DISPLACEMENT, which is advantageous because it reduces trunk loss It is caused by generating several different paging channels. In addition, the use of this interval SPACH slot allows the mobile station to process its received data to determine whether it needs to read additional slots. Conversely, if every SPACH slot is used instead of at least one interval, the mobile station with a slow processing unit may not be able to complete the processing within the time that the next SPACH slot occurs; because the mobile station does not yet know that the PCON bit has been It is set, so it must read the next slot, which is actually unnecessary, and the performance during sleep mode will be weakened.

In addition, the transmission of long ARCH or SMSCH information to the first mobile station may be interfered and the information may be transmitted to the second mobile station. The interference of each SPACH message to another ARCH or SMSCH message may be limited to no more than a predetermined It can be understood that the number n time slots, or the layer 3 pause limited by SMSCH or ARCH information, the layer 3 pause is a commonly used method to wait for a predetermined time to respond to the layer 3 information. At the same time, the number of times each mobile station can be interrupted by interference is also limited.

Generally, the probability of successfully completing the transmission of layer 3 information is inversely proportional to the length of the information. For long messages, the probability may be very small. A sluggish system may spend a lot of time repeating transmissions or rereading those that do not. The entire message received correctly. In the system of the present invention, layer 3 paging and interrupt transmission SMS messages are mapped to layer 2 frames, and these layer 2 frames are organized into a structure called a paging frame and an SMS frame, respectively. For the BCCH, if the layer 2 frame is not received correctly, there is no need to repeat the entire layer 3 information and only need to read the incorrectly received layer 2 frame, ARQ can be used for ARCH and RACH.

According to one purpose of the present invention, the super box and the super high-level box on each DCC are grouped into a series of paging boxes, and each paging box contains the integer of the super-high-level box and is one of multiple paging box levels. Member of the box; so the PCH slot has the structure of the paging box. According to one of the objects of the present invention, the mobile station can only read the designated PCH slot in the super high-level box of the paging frame level assigned by it (as described above, each mobile station is assigned a mobile station's IS-54B MIN A specific PCH sub-channel in the paging frame to identify the identity).

In many cases, the mobile station is assigned a paging frame so that the mobile station needs to read the designated PCH slot of each super-high-level frame; this way, the call initiation time and the sleep mode period can be reduced. However, other paging frames will cause mobile stations to read the PCH slots of the super high-level frames that are far away from each other, reducing the call initiation time and increasing the sleep mode period to 123 seconds, especially for certain types of paging frame structures, so we understand Each super high-level box contains a PCH slot, but the mobile station does not necessarily contain the PCH slot it belongs to.

Refer to the exemplary table in Figure 10, which shows the primary and secondary PCH tanks P and S in the primary and secondary super high-level boxes, and they can be grouped into one of 4 PF levels from PF1 to PF4 They are distinguished by the number of repeated occurrences of the PCH slot. The PF1 level is called the lowest PF level because of the number of times the data is repeated in this level. In Figure 10, the PCH slot is Repeatedly appear in each box. The PF4 level is called the highest PF level, because the PCH slot repeats the most in this level. In Figure 10, there is a PCH slot repeat in every 4 super advanced boxes. As mentioned above, the PCH value in the main box is also It will be repeated in the secondary box. In Figure 10, for the paging box level PF(i), i=2, 3, 4, only the PCH allocation is shown, which is for illustrative purposes.

In the system of Figure 10, there are 4 paging frame levels that are linearly related, resulting in a maximum rest time of 5.12 seconds for 8 super frames. If we have exponentially related levels, we can get a long sleep mode. For example, if a system with 8 paging frame levels can get 123 seconds of sleep time, the delay time of each level in the 8 levels is the previous level. 2 times, we can understand that long sleep time can cause access delay, which is unacceptable for ordinary phones. For example, most telephone users are unwilling to wait 123 seconds when using a mobile phone. After he dials the phone, this delay is acceptable under certain conditions, such as remote polling such as beverage vending machines. equipment.

In Figure 10, the smallest common divisor of the indicators of the 4 paging frames is 12, which is why the HF counter has a modulus of -12, as described above.

Three other terms describing the PF level are the original PF level, the designated PF level and the target PF level. The original PF level is the level assigned to the mobile station when the system is ordered. If the original level is just greater than the maximum level allowed by DCC For example, the maximum number of stages is just like the parameter PFC. The maximum allowable parameter is as specified in the DCC structure information. The mobile station uses the value of this parameter. Specifying the PF level means the level assigned to the mobile station by the system. For example, when the system is The response to the registration request of the mobile station. The PF level used in communication is called the current PF level.

Another aspect of the applicants invention is that the S-BCCH slots in consecutive super boxes are organized into a series of fixed-length SMS boxes, each of which preferably has 24 super advanced boxes (12 super advanced boxes) As shown in Figure 11, this S-BCCH block structure allows information to be transmitted in a highly variable periodic manner without sacrificing energy. As described below, it avoids rereading the entire S-BCCH in mobile stations. Necessity, when only one of a lot of information is changed, and selecting an SMS box structure related to the paging box can make the counter that has been used for paging purpose reusable (SMS interrupt transmission information).

This SMS box is advantageously divided into many sub-channels, each of which has its own repetition period, which is determined by the allowable SMS box. In practical terms, the repetition time of this seed channel should not be too long As mentioned before, when processing the F-BCCH change flag, the mobile station knows that the content of a certain sub-channel has changed through the SMS transfer flag (TF), and this TF is included in its PCH data.

At present, it is best to have 4 sub-channels, and the SMS sub-channel is sub-multiplexed in the S-BCCH channel, and is based on the SMS box as the unit, for example, the SMS box SMS(i), and i =1,...,N, as shown in Figure 12, each (layer 1) time slot has its related SMS box, and one layer 3 SMS message can occupy several SMS boxes.

Just as the SF number is obtained from the super box number and the primary super box indicator, this comes from the BCCH as follows: SF number = 2^★ HF number + primary SF indicator, the first S-BCCH slot contains start data in each SMS box (super box 0), and this start data describes the SMS sub-channel. As mentioned above, the number of super boxes in an SMS box is fixed, and the number of slots allocated to SMS boxes is 0, 24, 48, 72... (full rate), depending on how many slots are in each super box. The box is assigned to S-BCCH, and the SMS box is aligned with the starting point of the HF counter equal to 0, and is within the primary super box to help the mobile station and the SMS box to synchronize. In this way, the SMS box can be synchronized with the super advanced box or the super box. We understand that the starting point of the SMS box is the start point of the so-called length distance super advanced box (or super box), because the S-BCCH slot Not the first slot of the super box. Even more because of how many paging box levels are available, the system can increase the number of super high-level boxes to synchronize SMS boxes in a mobile station.

In each SMS box, according to the layer 2 data found in each first slot, the information of this set of SMS box SMS(i) can occupy several M(i) SMS boxes. Before a cycle is completed . No matter how the information group in the sub-channel changes, SMS and SMS(i) usually precede the SMS box according to the order of transmission. This SMS box has an SMS((i+1), modulus (N+1) )) is SMS((i+1)Mod N+1), therefore, the layer 3 interrupt transmission of SMS information can span several SMS boxes. In this case, it is a slot that takes the SMS interrupt transmission in each super box. A compromise between the number and the time required for information transmission. For each SMS sub-channel, it needs a transfer mark (TF), and this mark is re-divided into a single mark for all SMS sub-channels, and transmitted on the SPACH channel, which points to The next logical channel to be read. For example, the figure 12 shows that the mark TF(2) points to the SMS side SMS(2). If the transfer mark table of this sub-channel has changed, the mobile station will read the logic. The S-BCCH start field in the SMS box for further information, as described in more detail below.

The header information describes the sub-channel of the interrupted narration channel and is in the first slot of each SMS box. This mobile station can find the layer 3 structure related to this initial information, and an appropriate initial information of the beginning of each SMS box is as shown below.

<tables><img file="TW252246B_D0003.tif" /></tables>Note 1: The Nth of these two elements is set as the adjacent digital SMS data can occupy several SMS boxes, but marking TF can interrupt the sub-channel cycle (cycle clear), for example, in a TF mark After that, the mobile station assumes that the next sub-channel is the beginning of a new cycle. There are two ways to change the SMS to interrupt the transmission of data: change the third layer of information in the SMS (information can be added or removed from any position in the cycle ), and can change the structure of the sub-channel.

The ID of this SMS message is usually set to 256, and the start point of their related second layer boxes contains all the information of the SMS box. The ID of each SMS box is different and all 256. The values are used up. Before they are reused the next time, this is to help the mobile station find the changed information and avoid reading the information that has not changed. The initial information element of a second-level information points to the second-level side. The beginning of the box, where the relevant SMS information starts (but the information does not necessarily start from the beginning point of the second layer box). The information transmission method of S-BCCH is described in the second level specification below.

The following table shows an example. 4 pieces of information form box 1. We can assume that only one slot in each super advanced box is the S-BCCH slot (because the current hope is that each super advanced box Contains 24 SMS boxes, and each SMS box has 24 slots).

<tables><img file="TW252246B_D0004.tif" /></tables>

In the above table, this table is used to monitor SPACH when the TF changes to indicate that the S-BCCH has changed. The mobile station knows that it is the start of the SMS box through its internal super advanced box count, and it can determine whether the SMS sub-channel 3 is being relayed by reading the start information of the SMS and the change of TF pointing to an SMS sub-channel Place. When the SMS sub-channel 1 starts, the mobile station reads its beginning information. It finds that message 3 has been removed; the position of message 4 has also changed (but the message ID remains the same, so the mobile station does not need to reread this message; and messages 5 and 6 have also been added and it must be read. The mobile station may skip the appropriate second-level boxes to read new information).

S-BCCH's second layer rules

When the TDMA pulsation has S-BCCH data, it uses the S-BCCH second layer rule box. Each S-BCCH second-level rule box is just packed into a container of 125 bits, and an additional 5 bits are used as tail bits. These are the bits that are finally sent to the encoder. They form a unit with a total of 130 bits in the S-BCCH slot. As mentioned above, the S-BCCH operation principle of the second layer only allows unresponsive operations, in figures 13a, 13b, and 13c. Different S-BCCH second layer boxes are shown.

13a represents the necessary minimum S-BCCH start box, and 13b represents another S-BCCH start box, when there are 2 third layer information contained in this box, and its second third The layer box is continuous in the box below. This kind of start box is used to start transmitting 1 or more layer 3 information in S-BCCH, and currently we prefer to use S-BCCH to start The box is the first box in the S-BCCH cycle. If the first layer 3 information is shorter than an S-BCCH box, a start/end indicator. BE is added to the end of the L3 data field to indicate whether there is an extra layer 3 information that starts in the BEGIN Frame, as shown in Figure 13a. If the be indicator is set to indicate "end", then the remaining At the beginning, the box is filled with filler (Filler), for example, "0". As shown in Figure 13b, if the BE indicator has been set to indicate "start", a new layer 3 message starts in the start box. If the L3 DATA field terminates on the boundary of the S-BCCH box; then the BE indicator is not included in the box; and the "end" is metaphorical, if the L3 DATA field terminates, only There are less than 9 bits in this S-BCCH box, this BE indicator means "end", and the remaining boxes are filled with filler.

Figure 13c represents an S-BCCH continuous box (necessary and small), which is used for the continuity of layer 3 information. When this information is too large to fit in the previous box, the continuous length indicator The CLI field indicates how many bits are in the continuous box in the continuous information, so the previous layer 3 information may have to be filled with filler. If the BE indicator is set to "start", a new layer 3 message will start in the continuous box. If the L3 DATA field terminates on the S-BCCH boundary, then this box does not include the BE indicator; a "terminal" indicator is already metaphorical, if the L3 DATA field terminates the S-BCCH, the box only There are less than 9 bits left, the BE indicator is set to "terminal", and the remaining boxes are filled with filler.

This CLI allows the mobile station to accept any information that starts in a continuous box, even if a logical box has not yet been received. The following table lists the S-BCCH layer 2 rule box.

<tables><img file="TW252246B_D0005.tif" /></tables><tables><img file="TW252246B_D0006.tif" /></tables>Similar logical boxes can be specified for F-BCCH and E-BCCH, as in US Patent Application No. 08/147,254 as an example, but these are beyond the scope of this application.

Layer 3 information

The S-BCCH layer 3 information corresponding to the layer 2 box is described below. In the following, all the information is expressed in the form of a table. The data element in the upper row of the table is preferably sent to the first element of layer 2. In this information element, the most important bit (leftmost in the table) The bit) is the first bit sent to layer 2. This information element is described in alphabetical order after the information description below.

There are two types of S-BCCH messages used for SMS relay transmission. SMS box initial information information; with SMS non-initial information information, these are used to transmit actual information to the mobile station. The SMS box start information information describes the structure of the SMS sub-channel and is included in the first slot of each SMS box. The format of an appropriate SMS box is described in the following table.

<tables><img file="TW252246B_D0007.tif" /></tables>Note 1: These binary bodies are sent N times of appropriate SMS non-starting information continuously, and the relay sending information is as follows:<tables><img file="TW252246B_D0008.tif" /></tables>One of the characteristics of the applicants invention is that SMS information may be encoded. This encoding method allows different information service levels to be very similar to the cable television system. It can distinguish between premium services and basic services through disturbance or interference. This special program. For example, three levels may be provided as follows: In a basic level, a user can decode (decode) certain SMS relays after paying the fee, such as product advertisements, weather and vehicle traffic reports; higher levels After the customer pays a higher fee for the service, he will be able to decode basic information and additional information, such as Xinkai; and for the more advanced service, he can decode all the SMS relay transmission information after the customer pays the highest fee , Including financial estimates and high-value information.

The processing unit in the mobile station decodes the SMS message through various cryptography. Ideally, each relayed message can contain an indicator to determine the instruction to decode or the algorithm used to decode the message. This kind of mark can be included in the start information of the SMS box, and the decoding command or algorithm can be over the air or directly, via the "smart card", as a substitute method, the sub-channels can be individually coded for relay transmission The SMS information can be included in a period of the SMS sub-channel, and the transmitted SMS information can be included in another SMS sub-channel and can be encoded with another encoding method.

Description of the information component

There are several encoding rules that apply to the description of information components. For example, if the information element tag has a value of 0, it means "no effect" or "turn off" or "false", and a value of 1 means "effective" or "turn on" or "true". Moreover, some BCCH fields are not Trigger the transfer of the BCCH change flag in SPACH; these fields are considered unimportant, or "NC". Information element type "transfer" is a count of Modulo-1 to indicate that the current state has changed. The number of channels is coded according to the IS-54B standard, unless otherwise named with a different method, all Length is expressed in bit length, unless otherwise stated.

Start of layer 2 box

This variable represents the number of bits from the beginning of the SMS sub-channel cycle to the beginning of the SMS message. It may not start from the SMS slot, but it can be placed in the end/start cluster to start the transmission of the message.<tables><img file="TW252246B_D0009.tif" /></tables>

Number of SMS messages

This variable represents the number of relayed SMS messages in the SMS box (1 plus the value in this field).

Phase length of the sub-channel cycle

This variable represents the number of SMS boxes that make up a loop (it is 1 plus the value in this field).

Number of phases of the sub-channel cycle

This variable indicates that the SMS box is being relayed during a cycle.

Number of sub-channels

This variable indicates which sub-channel is currently being relayed. Since the current mobile phone operates in accordance with IS-54B, it is within a few microseconds when resting, but the electronic circuit constituting the mobile phone processing unit is suitable for achieving a longer period of time under the system invented by the applicant. Sleep time, to a certain extent, mobile transceivers and other electronic components currently in use will benefit from improvements that prolong the sleep period. In addition, the processing unit will be able to output more data.

Of course, there may be other ways to apply this invention without departing from the spirit of the invention. The system presented in this article is only exemplary and should not be regarded as restrictive. The scope of application of the present invention is determined by the scope of the following applications, rather than the above description, and all variations or equivalents can be included as long as they meet the scope of the following applications.