BRPI9904857B1 - TRANSMISSION DEVICE FOR A MULTIPLE ACCESS COMMUNICATION SYSTEM BY CODE DIVISION, AND PROCESS FOR THE TRANSMISSION OF DATE IN A WIRELESS COMMUNICATION SYSTEM - Google Patents

Description

‘‘ TRANSMISSION DEVICE FOR A CODE DIVISION MULTIPLE ACCESS COMMUNICATION SYSTEM, AND PROCESS FOR TRANSMITTING DATA TO A WIRELESS COMMUNICATION SYSTEM ’'. BACKGROUND OF THE INVENTION AND FIELD OF THE INVENTION The present invention relates generally to wireless telecommunications, e.g. more particularly, it is a device and a method for exchanging frame messages having multiple durations in a wireless communication system. 2. Description of Related Art Currently, a mobile communication system utilizing CDMA (‘'Code Division Multiple Access”) technology has become increasingly widespread. Conventional CDMA mobile communication systems as an example for a wireless communication system are based on the TIA / EIAIS-95 CDMA standard, and transmit control signals for multiplexed call processing with traffic channel data that carries voice, The traffic channel has a fixed frame duration of 20 ms. Two techniques have been proposed to transmit communication signal traffic with control signal traffic: a light end burst technique and a dark end burst technique. The trainer transmits the entire frame as a control message, and then transmits the control signal by sharing the frame with the main user traffic. [0 () 03) CDMA communication systems that provide multimedia services, including bent packet data services such as voice services, are maturing. New systems can separate channels for voice and data services to flexibly allocate channels at the user's request. To this end, the CDMA mobile communication system includes a voice traffic channel (or fundamental channel) and a packet traffic channel (or supplemental channel). 10 (J04 | Conventionally, for fundamental channel and supplemental channel data services, such CDMA mobile communication systems typically maintain the use of the fundamental channel to transmit control signals, even in a state where there is no communication between the base station and mobile station.This results in a waste of channel resources, thereby limiting radio capacity.In addition, the conventional CDMA mobile communication system uses the fixed single frame duration of 20 ms regardless of size. of a message to be transmitted, which may cause low productivity and traffic delays, SUMMARY OF THE INVENTION

It is therefore an object of the present invention to provide a transmitting, receiving and process device for exchanging frame messages of different lengths in a communication system via CDMA. providing a transmission device and process for interleaving frame messages of different lengths into a CDMA communication system. It is yet another object of the present invention to provide a receiving device and method for receiving interleaved messages of a first duration frame message and a second duration frame message in a CDMA communication system. . According to an illustrative embodiment of the invention, in a transmission device and process for a CDMA communication system, when a shorter frame message is generated during a transmission of a longer frame message, the transmission of that longer frame message is interrupted, as a result of which said shorter frame message is immediately transmitted in place of a portion of the longer frame message. In one embodiment, after the longer frame message is interrupted and the shorter frame message is transmitted, the final part of the longer frame message is transmitted accordingly. In other words, the replaced part of that longer frame message is not transmitted following the transmission of the shorter frame message. In an alternative embodiment, following transmission of the shorter frame message, the remainder of the longer frame message from the breakpoint is transmitted in its entirety. In the latter case, the longer frame message is delayed by the duration of the shorter frame message. In another alternative embodiment, following the shorter frame message transmission, the remainder of the longer frame message is discarded. BRIEF DESCRIPTION OF THE DRAWINGS 100091 The above and other objects, features as well as advantages of the present invention will become more apparent from the following detailed description when taken in conjunction with the accompanying drawings, wherein the same reference numerals indicate the same parallels. In the drawings: Figure 1A is a flow chart illustrating a call establishment procedure; Figure 1B is a flowchart illustrating a call release procedure; Figure 2A is a diagram illustrating a structure of a first frame message for a dedicated control channel in accordance with the present invention; Figure 2B is a diagram illustrating a structure of a second duration frame message for a dedicated control channel according to the present invention: Figure 2C is a diagram illustrating another structure of a second duration frame message for a channel. dedicated control unit according to the present invention; Figure 3A is a timing diagram illustrating a transmission time when the second duration frame message is used for the dedicated control channel in a mobile communication system according to the present invention; Figure 3B is a timing diagram illustrating a transmission time when the first duration frame message is used for the dedicated control channel in the mobile communication system according to the present invention; Figure 4 is a flow chart illustrating allocation and release procedures for a reverse dedicated control channel and reverse dedicated traffic channel in the mobile communication system according to the present invention; Figure 5 is a diagram illustrating a transmission device for a direct dedicated control channel in a mobile communication system according to the present invention; Figures 6A to 6C are diagrams illustrating an orthogonal code modulator (533) and a spread modulator (535) of Figure 5 in accordance with different embodiments of the invention; Figure 7 is a diagram illustrating a reverse dedicated control channel transmission device in that mobile communication system according to an embodiment of the present invention; Figures 8A and 8B are diagrams showing how a first duration frame message is interleaved with a second duration frame message according to an embodiment of the present invention; Figures 9A to 9D show different ways of interleaving a 20 ms frame with another 5 ms dc frame according to the present invention: Figures 10A to 10D show frame transmission pattern according to the interleaving processes; Figure 11 is a diagram showing scheme for interleaving frames of multiple durations in accordance with one embodiment of the present invention; Figure 12 is a diagram illustrating an interleaver (713) in a second frame message generator of Figure 11; Figure 13 is a diagram illustrating a selector (714) of Figure 11; Figures 14A and 14B are diagrams illustrating performances of signaled frames using matrix 1 and matrix 2, respectively; Figure 15 is a diagram illustrating a dedicated channel receiving device in the CDMA communication system according to another embodiment, other than the present invention; and Figure 16 is a diagram illustrating simulation results for a 5 ms frame message and another 20 ms frame message according to an embodiment of the present invention. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT 100010) A communication system Mobile via CDMA according to the present invention includes a fundamental channel for voice service, a supplemental channel for packet data service, and a dedicated control channel (DCCH), through which a mobile station can exclusively exchange a control signal by a base station. Those fundamental and supplemental channels are considered traffic channels. Said DCCH is dedicated for communicating the control signal with one mobile station at a time, rather than being simultaneously shared among a number of mobile stations. In particular, the dedicated channel is used in exchanging those signals to control the traffic channel connection. The fundamental channel, the supplemental channel and the dedicated control channel are the dedicated channels. According to the present invention, when transmitting / receiving a frame message using dedicated channels, the new CDMA mobile communication system uses frames of different lengths according to the frame message size. For a short frame message, the system generates and transmits a first frame message; For a long message, the system generates and transmits a longer second frame message. A process for exchanging those frame messages of different duration according to the present invention can be applied to both the traffic channel and the transmission channel. Dedicated control. The following detailed description provides an example of the process for use with the dedicated control channel; however, it is understood that the process applies to traffic channels as well.

The CDMA mobile communication system of the embodiment to be described controls (restricts) the output of the dedicated control channel when there is no frame message to be transmitted. Only when a frame message actually exists, an outbound path is formed for the dedicated control channel. [00013j] The dedicated control channel is used to exchange messages that control the connection of the traffic channel between the base station and the mobile station. Before describing the structure of such dedicated control channels, the channels used in the new CDMA mobile communication system and their uses will be discussed first. In direct link, which is an RF (radio frequency) link, for transmitting signals from the base station to the mobile station, common channels include a pilot channel, a sync channel, and a radio-realization channel (or a common control channel). . User channels include a dedicated control channel, a voice traffic channel, and a packet traffic channel. In reverse link, which is an RF link, to transmit signals from the mobile station to the base station, the common channel includes an access channel (or a common control channel) and the user channels include a pilot channel, a dedicated control channel, a voice traffic channel and a packet traffic channel. Thus, channel transceiver devices for the base station and mobile station in the present embodiment each include transceiver circuitry for transmitting and / or receiving the following information on the respective channels: (1) pilot channel information used to estimate gain and channel phase and further perform cell acquisition and transfer (hancloff): (2) radio channel channel information to perform initial synchronization and provide base station information and neighbor cell information; (3) access channel information; (4) voice data on the dedicated fundamental channel; (5) packet data on the dedicated supplemental channel; and (6) dedicated control channel information, which includes establishment / release and communication status-related frame messages for the dedicated fundamental channel and the dedicated supplemental channel.

Table 1 shows the uses of the respective forward and reverse link catalysts according to the services provided. TABLE (100016) The CDMA mobile communication system may have a standby mode, a voice mode (or voice traffic channel usage mode), a packet reservation mode (or traffic channel usage mode). packet mode), a competitive mode of the packet (or a common control channel mode of use) and a combined mode of the above modes according to service states. Said dedicated control channel is preferably employed for a call providing a service for packet reservation mode (namely, a service employing the packet traffic channel). For this case, the dedicated control channel is allocated to mobile stations using packet data service. As an alternative, however, the dedicated control channel can be used in conjunction with the voice traffic channel for dc voice service. high quality. In this scenario, the dedicated control channel may be shared by several mobile stations rather than exclusively used by a particular mobile station.

Call processing for packet data service is preferably compatible with an IS-95 call processing method. During call establishment for the packet data service, the source message and IS-95 channel allocation message that are modified to support the packet data service are employed; In the call release for the packet data service, an IS-95 release order message modified to support such a packet service is used. Exemplary call establishment and call release procedures performed at the request of the mobile station are shown in Figures 1A and 1B, respectively.

Referring to the flow chart of Figure 1A, the base station (BS) transmits a system sync message via the sync channel to the mobile station (MS) in step 111. The base station also sends system parameters, access channel and cell neighbor to the mobile station via the radiolocation channel in step 113. The mobile station then outputs an origin message via the access channel in step 115. The base station recognizes the source message through the radiolocation channel in step 116, and allocates the traffic channels via the radiolocation channel in step 117. When such traffic channels are assigned for communication between the base station and the mobile station, the system transitions to a connection establishment state in step 121, in which the dedicated control channels for the forward and reverse links are also allocated, [000191 Referring to Figure 1B, pa To release the call in the set up state, the mobile station sends a frame message for the call release request through the reverse dedicated control channel in step 151, and the base station then outputs a frame message to the call. call release through the direct dedicated control channel in step 153, 100020J As illustrated in Figures 1A and 1B, the differences between the message used in the call control procedure for packet data service and the IS- standard message 95, are as follows: In the source message (see step 115 of such Figure 1A), packet data mode is added to the service option; In the channel assignment message (see step 117 of Figure 1A), packet data control channel allocation information is added to the allocation mode and is used as an allocation indicator for the dedicated control channel, and further information related to the dedicated control channel (a channel identifier and a channel parameter) is included in an attached field. Additionally, in that release request and order messages (see both steps 151 and 153 of Figure! B), information related to the dedicated control channel is included in the attached field. As long as the dedicated control channel is not yet established in the connection establishment procedure, those call establishment related messages are transmitted through the IS-95 channels (ie, the synchronization channels, the radio location channels, and the Once said dedicated control channels for those forward and reverse links are established via call establishment related messages, said call control messages (for example, call release) are transmitted through said dedicated control channel. | 0 (Κ) 21 j For purposes of explanation, it is assumed that said dedicated control channel of the present embodiment has the following characteristics: a data rate of 9.6 kbps, a frame duration of 5 ms or 20 ms. ms, and a Frame Cyclic Redundancy Check (CRC) consisting of 16 bits (for the 5 ms frame) or 12 bits (for the 20 ms frame). Additionally, in a dedicated mode, which is not a common mode, several dedicated control channels are employed. Dedicated control channels operate only in a reserved transmission mode, not a competitive transmission mode. In the following description, the 5 ms frame duration is called a first frame message duration and the 20 ms frame duration is called a second frame message duration.

[0 () () 22 | Figures 2A, 2B and 2C illustrate frame structures of a first duration frame message for the dedicated control channel, a second duration frame message for the dedicated control channel when carrying signaling data, and also a message. second frame rate to the dedicated control channel when carrying traffic data respectively. The first frame message of Figure 2A is 5 ms in duration. Reference numeral 211 denotes a 24-bit fixed-length message body frame of an upper layer, preceded by a 1-type message flag. bit Reference numeral 212 denotes a first duration frame communicated in a physical layer (that is, data bits of frame 212 are transmitted wirelessly). Table 212 is comprised of a 24-bit payload field, a 16-bit CRC field, and an 8-bit final bit field. 24-bit payload frame segment of physical layer frame 212. The fixed duration message can be a Dedicated MAC Access Channel (DMCH) message, a Dedicated Signaling Channel (DSCH) message, or another type of message. 100023J Figure 2B illustrates the second duration frame (duration 20 ms), in which reference numeral 221 denotes an upper layer variable duration control message and reference numeral 222 denotes a sequence of control message frames. second duration (20 ms) communicated wirelessly in the physical layer. The variable length message can be the DSCH message. Data within the variable length message body of the DSCH message is distributed in the payload segments of the 20 ms frames. The payload segment of each 20 ms frame in that sequence, except for the last 20 ms frame, is 168 bits. The payload segment of the last 20 ms frame can be anywhere between 1 and 168 bits in size. Thus, the number of 20 ms frames in the transmitted sequence depends on the number of bits in the message body of the upper layer message. 100024i Figure 2C illustrates a 20 ms period second duration traffic frame, in which reference numeral 231 denotes an upper layer traffic structure and reference numeral 232 denotes a second duration traffic frame communicated in the layer. Physical, Traffic can be Dedicated Traffic Channel (DTCH) traffic. User traffic data is distributed between the payload portions of the 20 ms traffic frames in a similar manner as the control message data of Figure 2B. The dedicated control channel features the functions of delivering packet data service-related control messages (for example, a packet traffic channel allocation message, a layer 3 control message, etc.), delivering control message IS-93 by encapsulating, delivering a short user packet, and transmitting a power control bit (PCB) through the direct dial.

In order to increase the productivity of the CDMA mobile communication system, the frame duration of that dedicated control channel is allowed to vary. In particular, a frame duration obtained by dividing a frame length by an integer should be used to improve productivity. For example, when that frame length is 20 ms, it is preferable to design the system to be able to use a 5 ms or 10 ms frame. In the present embodiment, by way of example only, it is assumed that the 5 ms frame is used. Thus, it is possible to increase productivity and decrease traffic delay when compared to the case where the 20 ms frame shown in Figure 2B is used. This can be equally applied to traffic channels to efficiently process short control messages. if the traffic channel is used as user traffic data, 100027J Figure 3A illustrates a transmission time interval for the second duration frame message (i.e. 20 ms frame message), and Figure 3B illustrates a transmission time interval for first frame message (ie 5 ms frame message), The time required to send a request message through the dedicated control channel, and take corresponding action upon receipt of acknowledgment , is 80 ms as shown in Figure 3A when the 20 ms frame is used, and is 20 ms as shown in Figure 3B when the 5 ms frame is used. Of course, the latter represents the case where the respective messages are too short to load in the 5 ms frame, that is, where the maximum productivity gain can be obtained with such a 5 ms frame. In this, the reason why said productivity is increased is because signals are effectively transmitted, thereby increasing the time at which actual user data can be transmitted. [00028] Unlike the above method, it is also possible to reduce the transmission time. transmission of a control signal by interleaving the first duration frame message with the second duration frame message. Figures 8A and 8B illustrate transmission powers with respect to 'time' when first duration frame message is interleaved with second duration frame message. (As used herein. The term "interleaved coirf is meant to mean that The shortest message is inserted into the longer frame message either to delay the longer frame message, or to permanently replace the corresponding part of the longer frame message.When a permanent replacement occurs, the replaced part is not transmitted, and the part end of the longer frame message is transmitted without delay.) As an example to illustrate such a technique, the 20 ms message frame is shown divided into four 5 ms message frame durations, namely # 1, # 2, # 3 and # 4. Referring also to those Figures 8A and 8B, to merge the 5 ms frame message with the 20 ms frame message, the 5 ms frame can be inserted and transmitted in one of four divided durations # 1. , # 2, # 3, and # 4 of the 20 ms frame. Namely, the 20 ms frame message is interrupted, and the 5 ms frame is inserted. In this case, a 5 ms segment of the 20 ms frame message data is lost (i.e. not transmitted) at the interval (duration) where the shortest 5 ms frame is transmitted, but the lost data can be restored in a receiver by decoding an error correction code, To increase the probability of receiving the frame by 20 ms. the transmitter can increase transmit power at intervals that follow the duration where 5 ms frame data is lost. With this technique disclosed, there will be fewer bit errors in the propagation medium. For example, as shown in Figure 8A. When the 5 ms frame is interleaved with the 20 ms frame at the first duration # 1, the transmitter will increase transmit power by 33% over succeeding durations # 2, # 3 and # 4 of the 20 ms frame. Also, as shown in Figure 8B, when the 5 ms frame is interleaved with the 20 ms frame at second duration # 2, the transmitter will increase transmit power by 50% over succeeding frame # 3 and # 4 durations. 20 ms In addition, in order to minimize the influence of data loss for the duration of 5 ms, a 20 ms frame interleaver is designed such that the bits corresponding to the lost 5 ms frame data can be scattered over a row permutation technique. In this way, the 5 ms frame can be transmitted immediately even during the 20 ms frame transmission. thereby reducing the transmission time. A detailed description will be given with reference to Figures 9A through 14B. | O0030 | Although Figures 8A and 8B show examples of continuing to transmit the remaining 20 ms frame data data immediately after the first frame message is transmitted, it is also possible to erase the remaining frame data from that second art frame message. duration.

In the present embodiment, the dedicated control channel and the traffic channel are used in a control retention state and in an active state outside those states to perform procedures for packet data service. Shown in Table 2 are the relationship between “logical” and “physical” channels for both direct link and reverse link. Physical channels are channels that are transmitted via wireless medium, since the data carried by said physical channels is derived from the respective logical channels. In Table 2, the dedicated MAC channel (DMCH) is a direct or reverse channel required for the transmission of a Meto Access Control (MAC) message, and is a one-to-one channel allocated on the control retention state and active state for the package service. The dedicated MAC channel message on the logical channel essentially becomes the dedicated control channel message on the physical layer. The dedicated signaling channel (DSCH) is a direct channel or reverse channel required for the transmission of the Layer 3 signaling message. , and is a one-to-one channel (ce ,, unshared channel) allocated in the control retention state and active state for the packet service. The dedicated traffic channel (DTCH) is a direct channel or reverse channel required for the transmission of user data, and is a one-to-one non-shared channel allocated in the active state for the packet service. The control retention state in Table 2 means a state where, although the dedicated MAC channel (DMCH) and dedicated signaling channel (DSCH) are allocated to forward and reverse links, a RLP (Wireless Link Protocol) Radio) with the user data packet cannot be exchanged because the dedicated traffic channel (DTCH) is not established. In addition, the active state means a state where the DMCH, DSCH, and DTCH channels are allocated to forward and reverse links such that the RLP frame with the user data packet can be exchanged, [000341]. up to 2C show the logical channel message frames or mapped data in the physical channel frames. In these figures, reference numerals 211, 221 and 231 denote the logical channel message frames, and reference numerals 212, 222 and 232 denote the physical channel message frames. The following discussion relates to the structures and operations of the first duration frame and the second duration frame for said dedicated control channel. The frame duration of the dedicated control channel varies dynamically according to the message type. At the receiver, the frame duration is determined every 5 ms.

In a packet channel connection control mode for 5 ms fixed duration message transmission, as shown in Figure 2A, the request / allocation for the forward and reverse packet traffic channels is made using a 5 ms acknowledgment action / acknowledgment message. Direct packet traffic channel allocation that starts at the base station is independent of reverse packet traffic channel allocation that starts at the mobile station Connection control messages include a packet traffic channel request message, a message packet traffic channel allocation message and a packet traffic channel acknowledgment message. These messages are transmitted through the dedicated MAC channel (DMCH) between the logical channels. Table 3 shows reverse packet traffic channel allocation channel to message fields for the 5 ms first duration message frame. ______________________________ TABLE 3_______________________________ I00037J In Table 3, the respective fields are defined as: 'Main Header Information' - identifier, direction and type (ie request and acknowledgment) of message 'Sequence' - sequence of message 'Departure Time' - time Channel Utilization Start Time - Allocated Channel Rate “Allocated Duration” - Channel utilization duration for the allocated channel.

The 24 bit fixed size message in the form of Table 3 is transmitted with the 5 ms frame as shown in Figure 2A of the dedicated control channel.

Figure 4 is a flowchart illustrating a procedure for allocating and releasing the packet category channel through the dedicated control channel, while the system transitions from control hold state to active state, and then transitions from from the active state to the control retention state. It is assumed in step 411 that the base station and the mobile station maintain the control hold state to which the dedicated control channel is connected. In this state, the mobile station generates a control message to request allocation of the reverse packet traffic channel through the dedicated MAC channel (DMCH) and sends it through the physical channel in step 413. The base station then generates a message of control to allocate the reverse packet traffic channel via the dedicated MAC channel (DMCH) and send the control message generated via the physical channel in step 415. Then the base station and the mobile station transition to the active state. where the packet traffic channel is allocated to communicate packet data in step 417. In this active state, the mobile station initializes a TaiiVü timer in step 419 to check the time at which packet data transmission is discontinued. Here, if that packet data transmission is continued before a timer value Τ * ™ expires, the active state is maintained and then step 419 is repeated to initialize the timer Tíltíw. However, if packet data transmission is not continued until the T; Mivo timer value expires, the mobile station notices this in step 421, and generates a control message to request release of the reverse packet traffic channel. through the dedicated MAC channel (DMCH) and sends the control message generated through the physical channel in step 423. In response to that control message, the base station generates a response control message for releasing the packet traffic channel. via the dedicated MAC channel (DMCH) and sends the control message generated via the physical channel in step 425. Subsequently, the base station and mobile station release the reverse traffic channel and transition to the hold state. control at step 427, preparing for the next state.

As illustrated in Figure 4, during the procedure of requesting and allocating the reverse packet traffic channel, the mobile station generates the reverse packet traffic channel request message including the requested channel data rate information and sends it to the base station. The following base station analyzes the received message to determine whether or not the requested parameter can be supported and sends, in response to the request message, the reverse packet channel allocation control message from such Table 3 to the mobile station. according to the determination. When additional negotiation is required, the request and response procedures mentioned above may be repelled. Additionally, if there is no packet data to transmit during packet data communication, the packet traffic channel release process is performed after a time lapse set in timer 100042] In a transmission mode, for the duration frame variable message, the variable-length message - according to the IS-95 standard - is loaded separately into the 20 ms frames of the dk control channel as shown in Figure 2B. Specifically, those transmission modes may include a mode. for transmitting the frame without ACK / NACK (negative acknowledgment) detection, a mode in which said ACK / NACK occurs when an entire message of variable duration is received, and a retransmission is performed for the entire message. variable duration, and a mode in which said ACK / NACK is performed for the respective frames.

In a user data transmission mode, RLP frames with user traffic are separately loaded into the 20 ms frames of the dedicated control channel, as shown in Figure 2C. User data transmission mode can be used where it is inefficient to establish the packet traffic channel for transmitting the data as there is a small amount of data to transmit.

[0 () 044] An embodiment of a physical scheme for transmitting dedicated channel frames in the CDMA mobile communication system using the dedicated control channel described above will now be described. 100045J Referring to Figure 5, one is shown therein. direct dedicated channel frame transmission device in a multi-carrier CDMA communication system. A message buffer 511 temporarily stores a frame message communicated through said dedicated channel. Message buffer 511 should be of an appropriate size to store one or more second duration frames of 20 ms. In addition, message buffer 511 interfaces with a frame message between a higher layer processor (not shown) and a modem controller 513 or between a user data generator (not shown) and the modem controller 513. Such a higher layer processor sets a flag after storing the frame message in said 51 L message buffer and that controller Modem 513 clears the flag after reading the frame message to prevent overwriting and overreading. | 00046 | After reading the frame message stored in message buffer 511, the modem controller 513 parses a frame message header element to detect a message type, outputs message data (or payload) to be transmitted through dedicated channel according to the detected message type, and outputs frame selection signals according to the detected message type. Here, the types of that frame data include the first duration frame data of Figure 2A and the second duration frame data of Figure 2B. Modem controller 513 outputs frame messages of different sizes according to the analysis. That is, for 5 ms frame data, that modem controller 513 outputs data from the first 24 bit frame having the structure of Table 3 at a first output terminal 541; For 20 ms frame data, modem controller 513 outputs data from the second 172-bit frame at a second output terminal 542. Further, modem controller 513 determines the absence / presence of frame data to control a dedicated control channel output. That is, the modem controller 513 generates a first frame selection signal upon detection of the 5 ms first duration frame message, and generates a second frame selection signal upon detection of the second frame duration message. 20 ms In addition, modem controller 513 generates a first gain control signal in the event where it is the 20 ms frame message or 5 ms for transmission. However, in the event that the 5 ms frame message is interleaved with the 20 ms frame message, modem controller 513 generates a second gain control signal to increase transmit power in the remaining part of the frame message. 20 ms frame following the duration where such frame messages are interleaved. In addition, when there is no frame message for transmission, modem controller 513 generates a third gain control signal to restrict signal transmission on the dedicated control channel. 1000471 In swine, modem controller 513 generates the first frame select signal and the first gain control signal to output the first duration frame data to first output terminal 541. Also, modem controller 513 generates the second frame select signal and the second gain control signal to output the second duration frame data at the second output terminal 542. In addition, when the 5 ms frame message is interleaved with In the 20 ms frame message during transmission of the 20 ms frame message, modem controller 513 outputs the first and second frame data at the first and second output terminals, respectively, and generates the first signal. Select Frame Select to select the first duration frame message of 5 ms for the duration where that first duration frame message is output. After transmission of the 5ms first duration frame message, modem controller 513 generates the second frame selection signal to select the second duration frame data for the remaining duration of the 20 ms frame message and generates the second gain control signal to increase the transmit power of that second duration frame data being transmitted at that time. However, when there is no frame message to transmit, modem controller 513 generates the third gain control message to block a dedicated control channel transmission path.

In the example, first duration frame data refers to a 5 ms first duration bit stream (consisting of 24 bits) and second duration frame data refers to a 5 ms first bit stream. second duration of 20 ms (consisting of 172 bits).

A 515 Cyclic Redundancy Check (CRC) generator adds 16 CRC bits to the 24-bit first-size frame data output from the 513 modem controller to make it possible to determine frame quality (that is, determine if whether or not the board has an error) on the receiver. Specifically, upon receipt of the 5 ms frame data, the CRC generator 515 generates 16 CRC bits to output the 40 bit frame data under the control of modem controller 513. | () () 050 | An end bit generator 517 generates end bits necessary for the completion of an error correction code. This end bit generator 517 generates and adds the end bits at the end of the first frame message to allow An encoder 519 at the next stage encodes the message by the first frame unit. Specifically, the final dc bit generator 517 generates 8 final dc bits and adds them to the output of that CRC generator 515, thereby outputting the 48-bit frame message as represented by reference numeral 212 of Figure 2A. Encoder 519 encodes an output of such an end bit generator 517. By way of example, that encoder 519 may be a convolutional encoder or a turbo encoder that uses a 1/3 encoding rate and a restriction of duration of 9, thus generating 144 encoded bits (or symbols). 10 () () 521 An interleaver 521 interleaves the output of the 5 ms frame message from encoder 519. That is, interleaver 521 rearranges the symbols within the frame by the first 5 ms first frame unit to improve a tolerance for burst errors. In the present embodiment, interleaver output of interleaver 521 will be referred to as a first frame message, 1000531 All CRC generator 515. end bit generator 517. encoder 519 and interleaver 521 constitute a first frame message generator 550 for generating the first frame message upon receiving first frame data, 100054J A 516 CRC generator adds 12 CRC bits to the 172 bit second size frame data output from modem controller 513 to make it possible to determine the quality of the frame (that is, whether or not the frame has an error) at the receiver. Specifically, upon receipt of 20 ms dc frame data, the CRC dc generator 516 generates 12 CRC bits to output the 184 bit frame data under the control of modem controller 513, 100055J An end bit generator 518 generates end bits required to terminate an error correction code. This end bit generator 518 generates and adds the end bits at the end of the second duration frame message to enable an encoder 520 at the next stage to encode the message by the second duration frame unit. Specifically, the end bit generator 518 generates 8 end bits and adds them to the output of that CRC generator 516, thereby to output the 192 bit frame message as represented by reference numeral 222 of Figure 2B. Encoder 520 encodes an output of such end bit generator 518. That encoder 520, used in the embodiment, is a convolutional encoder or a turbo-coder which uses a 1/3 encoding rate and a duration restriction of 9. Therefore, encoder 520 generates 576 encoded bits (or symbols), [00057 | An interleaver 522 interleaves the 20 ms frame message output from encoder 520, That is, interleaver 522 rearranges the symbols within the frame by the 20 ms second duration frame unit. in order to improve a tolerance for burst errors. In the present embodiment, the interleaver output of interleaver 522 will be referred to as a second frame message.

All CRC generator 51.6, end bit generator 518, encoder 520 and interleaver 522 constitute a second frame message generator 560 for generating the second frame message upon receiving the data from the second frame.

[Ü0059J A multiplexer 523 selects the outputs of those first and second interleavers 521 and 522 according to the frame select signal output \ SCTL ”of modem controller 513. That is, multiplexer 523 selects the output of the first interleaver 52! in response to the first frame selection signal and the output of the second interleaver 522 in response to the second frame selection signal. A multiplexer may be employed for multiplexer 523. Modem controller 513 and selector 523 serve as an inserter for interleaving the first frame message with the second frame message when first duration frame message is generated during transmission of message. second frame or when first and second frame messages are generated simultaneously. A signal mapping and multiplexing block 525 maps an output of the frame message from that multiplexer 523 and multiplexes the mapped frame message to first and second channels. That is, the signal mapping and multiplexing block 525 maps the frame message by converting a control signal from logical 'Τ' to 'I' and a control signal from '(logical to' ί-Γ \ e gives output to the numbered control signals odd to the first channel and the even numbered control signals to the second channel 100061J A control bit insert 531 inserts a control bit into the output of the mapping and site multiplexing block 525. This bit entered control can be a power control bit (PCB) for mobile station reverse link power control 1,000621 Gain controllers 527 and 528 control gains of corresponding channel signals output from a control bit punch 531 according to gain control signal output “GCTL” from modem controller 513. That is, gain controllers 527 and 528 output the input signals as they are in response to the first gain, increase input signal gains to increase transmit power in response to the second gain control signal, and reduce input signal gains to 0 ('zero') to discontinue a dedicated control channel output at response to the third gain control signal. Accordingly, such gain controllers 527 and 528 form or block paths for that frame message on the dedicated control channel according to the gain control signals output from modem controller 513. That is, gain controllers 527 and 528 proceed with a DTX (Discontinuous Transmission) mode of operation, in which the dedicated control channel path is formed according to the gain control signals when there is the frame message to transmit, and the dedicated control channel path is blocked when there is no frame message to transmit. Also, gain controllers 527 and 528 raise the output signal strength when the 5 ms frame message is interleaved with the 20 ms frame message under controller control. As such, the gain controllers 527 and 528 constitute a power controller for controlling the transmit power of the sites.

A 529 serial / parallel (S / P) converter multiplexes input signals to propagate the control signals output from gain controllers 527 and 528 through the multiple carrier signal. An orthogonal code modulator 533 generates an orthogonal code according to the number and duration of the allocated channel orthogonal code and orthogonally modulates that frame message by multiplying that frame message by the generated orthogonal code. -oriogonal or an m-chip resistance code can scr used for orthogonal code. A spread modulator 535 spreads the orthogonally modulated signal output from that orthogonal code modulator 533 by its combination with a spread sequence such as a pseudorandom noise (PN) sequence. The structures of that orthogonal code modulator 533 and that spread modulator 535 are shown in Figures 6A to 6C. 1000651 Referring to Figure 6A. A Walsh 615 code generator generates a Walsh code for the dedicated control channel. (Walsh code is the most widely used orthogonal code). Multipliers 611 and 613 generate orthogonal modulation signals by matching the corresponding I and Q channel input signals with the Walsh code output of the Walsh code generator 615. The spread modulator 535 spreads the corresponding channel I and channel Q signals. outputs from multipliers 611 and 613 with PN sequences (PNi and PNq) supplied from a spread sequence generator (not shown). For the spread modulator 535, a complex PN spreader can be used. However, when Walsh codes are insufficient in number for channel separation, quasi-orthogonal codes can be used to expand the number of orthogonal codes. This c. there is a set of orthogonal code according to a predetermined code size: for example, when the code size is 256, there is a 256x256 Walsh code set of which N sets of quasi-orthogonal dc codes 256x256 (where N is a natural number) can be produced systematically. Such quasi-orthogonal code sets have minimized interference between quasi-octagonal code channels and Walsh code channels and have a fixed correlation value between quasi-orthogonal codes. 100067J Figure 6B illustrates a quasi-orthogonal code generator 533 and a spread modulator 535. Referring to Figure 6B, a Walsh code generator 615 generates a Walsh code according to the channel Walsh code number and duration. allocated, and a quasi-orthogonal code mask 617 generates a quasi-orthogonal code mask signal. Exclusive OR gate 619 logically operates Walsh code and bitwise quasi-orthogonal code mask signal to generate quasi-orthogonal code Multipliers 611 and 613 multiply corresponding channel 1 and Q channel signals by quasi-orthogonal code output 619 exclusive OR port 619 to spread the frame message from the dedicated direct link control channel. Such a spread modulator 535 spreads the corresponding channel 1 and Q signals output from multipliers 611 and 613 with the above mentioned PN sequences PNi and PMq. (00068] In Figure 6B, the quasi-orthogonal code is generated by multiplying the Walsh code by the quasi-orthogonal code mask signal (or by logically operating through the exclusive OR port the Walsh code and quasi-orthogonal code mask site). , when the data is represented by '* 0 ”and“ l ”) .A suitable quasi-orthogonal code generator is disclosed in detail in Korean patent application No. 46402/1997, entitled:" Generation Device and Process " Quasi-Orthogonal Code for Mobile Communication System ”, deposited by the applicant of the present invention and incorporated herein by reference. By using the quasi-orthogonal code, it is possible to increase the number of channels encoded by a factor of 'Ν', enabling many traffic channel users use the only dedicated control channels.

Figure 6C shows a scheme for generating a quasi-orthogonal code according to another embodiment. Referring to Figure 6C, a Walsh code generator 615 generates a Walsh code for the dedicated channel. Multipliers 611 and 613 multiply the corresponding I and Q channel signals by the Walsh code output of the Walsh code generator 615 to generate orthogonal modulation signals. A PN 653 mask generates a PN mask signal, and a PNi generator 655 generates a PN sequence (PNi) for the L channel. Port E 657 logically operates the PN mask signal and the bitwise PN (PNi) sequence to generate a carial spread signal I. A PN 654 mask generates a PN mask signal, and a PNq generator 656 generates a PN sequence (PNq) for the Q channel. An E 658 port logically operates the PN mask signal and the PN sequence. (PNq) bitwise to generate a Q-10007OJ channel spread signal In Figure 6C, such PN sequences generated by the logical operation by port E of the specific PN masks with the respective outputs of the PNi generators and PNq 655 and 656 are used in the generation of quasi-orthogonal codes. This way, a quasi-orthogonal code set is generated for each PN mask. Therefore, when 'Ν' different PN masks are used, it is possible to expand the number of coded channels, which is similar to the process of generating N quasi-orthogonal code sets using the ase-orthogon code generator to 1 .

In another embodiment, by moving the PN sequence by specified ehips in the same manner as the process using the PN mask, it is possible to obtain the result of expanding the number of encoded channels, which is similar to the case where the generator of quasi-orthogonal code is used. It is preferable to apply frame scaling to dedicated channels for forward and reverse links. This expression 'frame scaling', which is used interchangeably with 'frame shifting', means an operation of shifting the frames. frames of the respective data channels for a predetermined time on the system time basis. In general, frame shifting is applied to obtain the result of dispersing the frame processing load when processing the transmit and receive data at the mobile station or base station. That is, frame scheduling is implemented for the effective use of common resources (namely trunks) to process data. For example, in the conventional IS-95 system, traffic channel frames are offset by a multiple of the power control duration of 1.25 ms, and the maximum frame offset is 18.75 ms, which is 15. times the length of 1.25 ms. In the IS-95 system, even if the offset between base stations is given by 1.25 ms, the power control bits could not be evenly distributed. Transmission of unevenly distributed power control bits could result in periodic fluctuation of global power. Thus, to prevent fluctuation due to the insertion of the power control bits, the dedicated channel performs frame level scaling of encoded bits in 1.25 / 12 = 0.104 units to evenly distribute the control bits. power over the duration of 1.25 ms.

In view of the foregoing description, the operation of the dedicated control channel transmission device will be described hereinafter. In Figure 5, the frame duration (5 ms or 20 ms) of the message to be transmitted is determined on the controller. Modem controller 513, that is, the modem controller 513 determines the frame duration by examining the header (main) information that represents whether the frame message stored in message buffer 511 is a fixed-length frame message of 24. bits or a variable-length frame message. When the (main) header information represents that 24-bit fixed-length frame message, it is determined that the frame message has a frame length of 5 ms. that frame message of varying duration, it is determined that the frame message has a frame duration of 20 ms. Modem controller 513 outputs the input frame data to generate it first frame message generator 550 or to second frame message generator 560 according to the frame duration determination, generates the VSCTL 'frame select signal to select first frame message generator 550 or second frame message 560. and generates the gain control signal 'GCTL' to output or restrict frame message output.

[000741 Table 4 shows control signals generated from modem controller 513. _____________________________TABLE 4________________________________ [00075] Numerals in subblocks 515, 517, 519, and 521 of first frame message generator 550 and numerals in subblocks 516 , 518, 520 and 522 of the second frame message generator 560 represent bile numbers according to the 5 ms and 20 ms frame durations. Also, modem controller 513 controls the dedicated channel in DTX mode. . That is, in the preferred embodiment, the signaling message and the MAC-related message for the data service are transmitted / received via the dedicated control channel, contributing to an effective use of channel capacity. The IS-95 system is structured to multiplex voice traffic and signaling traffic such that voice and signaling channels should normally be opened for data service. However, since the dedicated channel of the invention operates in DTX mode, it is not necessary to normally open the channel for the control signal. When there is no signal information to transmit, it is possible to suppress a transmit power on a DTX gain controller, thus effectively utilizing radio capability. 1000771 Regarding the DTX transmission operation mode. when it is realized that message buffer 511 has no control message to transmit, said modem controller 513 generates the third gain control signal such that gain controllers 52? and 528 maintain a dedicated control channel output as “(Γ, That is, such modem controller 513 generates the first gain control signal of a predefined gain, or the second gain control signal, which is determined by according to the position where the 5 ms frame message is output when there is the frame message to transmit, and generates the third gain control signal (namely GCTL = 0) when there is no frame message to transmit Gain controllers 527 and 528 may be positioned following a spreading stage, In addition, although the invention has been described with reference to an embodiment that performs the DTX mode for the dedicated control channel employing gain controllers 527 and 528. It is also possible to block the signal path using the 523 multiplexer when there is no control signal to transmit to the dedicated control channel.

[() 0 () 781 Moreover, it is also possible to merge the 5 ms frame message with the 20 ms frame message into a transmission of the frame messages, as shown in Figures 8A and 8B. When the 5 ms frame message and the 20 ms frame message are incorporated here simultaneously at duration # 1, as shown in Figure 8A, modem controller 513 applies the 5 ms frame data to the first message generator. frame 550 and the 20 ms frame data to the second frame message generator 560. For duration # 1, first and second real integers 521 and 522, said 5 ms and 20 ms frame messages are output. respectively. That multiplexer 523 then selects the output of the first interleaver 521 in response to the first frame select signal, and those gain controllers 527 and 528 transfer the output signals as they are in response to the first gain control signal. Consequently, for duration # 1, the 5 ms frame message is output as its original input signal level. Upon transmission of the 5 ms frame message for duration # 1, said multiplexer 523 selects the output of the second interleaver 522 in response to the second frame selection signal, and gain controllers 527 and 528 increase the transmission power of the message. 20 ms frame rate output from multiplexer 523 in response to second gain control signal. For the remaining durations # 2, # 3, and # 4, the 20 ms frame data transmission power is increased by 33%. compared to the input power level. After duration # 4, gain controllers 527 and 528 block the frame message output path in response to the third gain control signal (GCTL = 0).

In Figure 8B, the 5 ms frame message is received at duration # 2 during transmission of the 20 ms frame message received at duration # 1. In this case, for duration # 1, modem controller 513 applies the 20 ms frame message to the second frame message generator 560 and generates the second frame select signal and the first gain control signal. For duration # 2, said modem controller 513 applies the 5 ms frame message to the first frame message generator 550 c and the 20 ms frame message to the second frame dc message generator 560 and generates the 5 ms select signal. first frame and first gain control signal, As a result, the 20 iris frame message is output at the original signal level for duration # 1, and the 5 ms frame message is output at the original signal level for the duration # 2. After duration # 2, multiplexer 523 selects the output of second interleaver 522 in response to the second frame select signal, and gain controllers 527 and 528 increase the gain of the 20 ms frame message output from multiplexor 523 in response. at the second gan.lio control signal. For those remaining durations # 3, and # 4, the gain is increased by 50%. compared to the input signal level. After duration # 4, said gain controllers 527 and 528 block the frame message output path in response to the third gain control signal (GCTL = 0).

Further description will be given to the frame interleaving processes when it is necessary to transmit the 5 ms frame message during transmission of the 20 ms frame message, or when the 5 ms frame message and 20 ms frame message are generated simultaneously.

In a first interleaving process.when the shorter frame message is generated during transmission of the longer frame message, the shorter frame message is transmitted in its entirety (for example, within a 5 ms interval), By delaying transmission of the longer frame message, the remaining part of the longer frame message is transmitted after the transmission of the shorter frame message. In this process, since the shortest frame message and the longest frame message are fully transmitted, performance degradation may not occur during decoding at the receiver. However, when there is a time limit on transmitting frame messages, the sum of the two frame messages will exceed the time limit.

In a second interleaving process, when the highest frame message is generated during transmission of the longer frame message, the shorter frame message is transmitted in place of a portion of the longer frame message, and that The part that was replaced is never transmitted. The final end of the longer frame message is then transmitted in a non-delayed manner. In this process, data from the longer frame message may be lost in the overridden parle, causing decoding performance degradation. However, this problem can be minimized depending on how you design a symbol distributor for the longest frame message, [000831 For the sake of coding 1, where your coding time depends on the position. From those symbols replaced in a frame duration By searching for a position having the best decoding performance for the replaced frame message and replacing the frame message at that position, the problem of decoding performance degradation can be solved.

For this purpose, it is necessary to search for the position having the best decoding performance when said longer frame message is replaced for as long as the duration of the shorter frame message. For this purpose it is necessary to determine the replacement position (namely drilling position) and to measure the decoding performance for that position. In measuring the coding performance of the eVolutional code, the following parameters are used: a free distance duVJv representing the minimum "Hamming" distance between coded symbols, a transfer function representing an upper bound formula of a bit error rate and a distribution of the distance from 'Hamming' * between symbols (see, for example, 'Error Correction Code: Fundamentals and Application', Shu Lin / Daniel J, Costello, Jr.) * [00085) Parameters are measured for respective replacement positions to search for the preferred replacement position. If it is possible to move the searched positions to that position to be drilled in the immersion process, the problem that appears in the merge process can be solved. With regard to the signal loss problem, the power loss can be compensated by increasing the signal strength of the remainder of the longer frame message as much as the lost power. 1000861 Searched replacement positions are measured through experiments to verify performance. After that, the symbol distributor is designed to move the symbols in the searched positions to the positions to be drilled in the interleaving process. An interleaver can be used for the symbol distributor.

In the embodiment, it is assumed that the 5 ms frame is interleaved with the 20 ms frame, and the 192 bit 20 ms frame is encoded in the convolutional code of a 1/3 encoding rate. Here, the number of coded symbols is 576. In the following description, the 5 ms frame refers to the first frame message having 5 ms frame duration, and the 20 ms frame refers to the second frame message having frame duration of 20 ms, As shown in Figures 9A through 9D, since the 5 ms frame constitutes a quarter of the 20 ms frame duration, there are four possible interleaving positions , this is. When the 20 ms frame is divided into four durations, the 5 ms frame may be interleaved with the 20 ms frame at any one of the four divided durations. In this example, 20 ms frame data is lost to the interval at which 5 ms frame data is transmitted. As discussed above, such lost 20 ms frame data is restored via the error correction code decoding function on the receiver. In order to increase the probability of receiving the frame by 20 ms, the transmitter increases transmission power over those remaining durations following the lost 5 ms duration. For example, when the 5 ms frame is interleaved at the 20 ms frame duration # 1 as shown in Figure 9A, the 20 ms frame power is increased by about 33% over the following durations # 2, # 3 and # 4. When the 5 ms frame is interleaved at the 20 ms frame duration # 2, as shown in Figure 9B, the 20 ms frame power is increased by about 50% over the following durations # 3 and # 4. When the 5 ms frame is interleaved at the 20 ms frame duration # 3, as shown in Figure 9C, the 20 ms frame power is increased by about 100% at the following duration # 4. However, when the 5 ms frame is interleaved at the 20 ms frame duration # 4, as shown in Figure 9D, there is no way to compensate for the lost power. In this case, decoding performance may deteriorate compared to those three cases above.

In addition, in order to minimize the influence of data loss, the 20 ms frame interleaver is designed such that symbols corresponding to the 5 ms duration to be suppressed when performing row swapping should be scattered.

Then an optimal interleaver can be considered through the suppression matrices. Since a quarter of the 20 ms frame is replaced by the short message, namely a quarter of the 20 ms frame is punctured, the 144 (= 576/4) bits should be punctured. Next, it should be determined how to suppress 144 bits out of 576 bits without deteriorating decoding performance. There may then be numerous cases according to the drilling positions. In this embodiment, the respective parameters will be measured for some regular drilling types. The following are the suppression matrices that conform to the drill types: | 0 () 091 | In suppression matrix # 1, “0” in the first row and 11th in the first column means that a first bit of information encoded by a first polynornial generator is deleted (punctured), “1” in the first row and the second column means that the second bit of information encoded by the first polynornial generator is not deleted, and “1” in the second row and the first column means that the first bil of information encoded by the first polynornial generator is not deleted. Here, the free distance is 11 to Suppression Matrix # 1, 12 for Suppression Matrix # 2, 10 for Suppression Matrix # 3, and 10 for Suppression Matrix # 4. The free distance represents the minimum “Hamming” distance between symbols and the distance. of "1..lamming1" represents the number of bits drifted between encoded symbols, Ί. As the distance from “Hamming” gets larger, the decoding performance is increased. Consequently, those suppression matrices # 1 and # 2 exhibit the best properties in terms of free distance as compared to those suppression matrices # 3 and # 4. Still, although suppression matrix # 1 exhibits better property than suppression matrix # 2 in terms of free distance, suppression matrix # 2 has better property than suppression matrix # 1 in terms of free distance. Hamming distance distribution between coded symbols, [00092] Shown in Table 5 is an interleaver designed to have the shape of perforation according to deletion matrix # 1, TABLE 5: 32x18 arrangement of coded symbols 100093J Figures 10A through 10D illustrate the symbol shapes of the 20 ms frame transmitted by the interleaver designed according to deletion matrix # 1 for the respective interleaving processes. Specifically, Figure 10A illustrates the case where the 5 ms frame is interleaved with the frame. dc 20 ms at duration # 1. With respect to information bits 1, 2, 3, 4 and 5, drilling is performed in the order of the first symbol data Si, of the second symbol data $ 21. of the third symbol die $ 32. of the fourth symbol die S40 and the fifth symbol die S51 according to deletion matrix # 1. Here the symbols have the equivalent powers as illustrated in the figure. Figure 10B illustrates the case where the 5 ms frame is interspersed with the 20 ms frame at duration # 2. The shape of the perforation is similar to that of Figure 10A, and the respective symbols have different powers according to the range (duration) to which they belong. That is, symbols belonging to duration # 1 are transmitted at the original power, and symbols belonging to durations # 3 and # 4 are transmitted at a power level increased by 50% compared to the original power. Figure 10C illustrates the case where the 5 ms frame is interleaved with that 20 ms frame at duration # 3. The shape of the perforation is similar to that described above, and the respective symbols have different powers according to the durations to which they belong. For example, symbols belonging to durations # 2 and # 3 have the original power, and symbols belonging to duration # 4 have about twice as much power as compared to the original power. Finally, Figure I.ÜD illustrates the case where the 5 ms frame is interspersed with the 20 ms frame at duration # 4. The punch format is the same as that described above, and the symbols have the original power, 1000941. Figure 11 illustrates a scheme for interleaving frame messages of different durations in accordance with one embodiment of the present invention. In the Figure, an interleaver 713 is designed to read the property of Table 5 according to suppression matrix # 1. Therefore, the specification will present the scheme designed according to suppression matrix # 1 by way of example.

Referring now to Figure 11, an encoder 711 generates an encoded 5 ms first duration frame message, and an output of encoder 711 is interleaved via an interleaver (not shown). An encoder 712 generates an encoded 20 ms second frame message, and immercal 713 interleaves said encoded 20 ms frame message output from that encoder 712 to rearrange the symbols within the frame such that the corresponding symbols are punctured. according to suppression matrix # 1. A selector 714 selects the output of that encoder 711 or an output of that interleaver 71.3 according to the frame select signal. That is, that selector 714 selects the output of encoder 711 in response to the first frame select signal, and selects the output of immercal 713 in response to the second frame select signal. A multiplexer may be used for selector 714.

[000961] A power controller 715 controls a gain of the selector signal output 714 according to the gain control signal. Namely, said power controller 715 outputs the input signal, as it is, without gain control in response to the first gain control signal, increases the input signal gain to increase the output power in response to second gain control signal, and controls the gain of the input signal at 0 (zero) in response to the third gain control signal. When the gain is 0 (zero), there is no output signal such that the channel output is cut off. Now, a description will be made with respect to an operation of merging the 5 ms frame message with the 20 ms frame message with reference to Figure 11.

Encoder 711 encodes first frame data input and outputs first frame message to selector 714. Encoder 712 encodes second frame data input and generates second frame message to interleaver 713, Interleaver 713 then rearranges the symbols within the second frame message so that the symbols are punctured according to deletion matrix # 1 for the respective cases of Figures 9A to 9D. The structure of that interleaver 713 is illustrated in Figure 12.

Referring now to Figure 12, interleaver 713 consists of 32 delays 743-746. When the second frame message is output from encoder 712, a switch 732 connects a node 731 to a node 733 for output. to a first symbol for delay 743, and connects node 731 to a node 734 to output a second symbol to delay 744. Thus, after a 32 ° symbol is output to delay 746, switch 731 connects again node 731 to node 733 to output a 33rd symbol for delay 743. Repeating this process, 18 symbols are stored in the respective delays. Thereafter, according to the interleaving function of Table 5, a switch 741 connects a node 742 to a node 737 to output the symbols stored in delay 743. Next, switch 741 connects node 742 to a fifth output node delay to output the symbols stored in that fifth delay. That is, the symbols that are stored in the first, fifth, ninth, thirteenth, seventeenth, twenty-first, twenty-fifth and twenty-ninth delays are output in sequence for frame length # 1 of 20 ms; symbols stored in the second, sixth, tenth, fourteenth, eighteenth, twenty-second, twenty-sixth and thirtieth delays are output in sequence for frame length # 2 of 20 ms; symbols stored in the third, seventh, eleventh, fifteenth, nineteenth, twenty-third, twenty-seventh and thirty-first delays are output in sequence for frame length # 3 of 20 ms; and symbols stored in the fourth, eighth, twelfth, sixteenth, twentieth, twenty-fourth, twenty-eighth and thirty-second delays are output in sequence for frame length # 4 of 20 ms. Values output from interleaver 713 are entered at selector 714 and interleaved with a 5 ms frame applied to another input end of selector 714. 1000100] Figure 13 illustrates the structure of selector 714. If the 5 ms frame is inserted while a switch 755 connects a node 754 to a node 753 to output the 5 ms frame for duration # 1, the 5 ms frame input is temporarily delayed by delay 751. After duration # 1 has passed, key 755 connects node 754 to node 752 to output delayed 5 ms frame symbols for duration # 2. Thus, the 20 ms frame symbols are deleted at duration # 2. After passage of duration # 2, switch 755 reconnects node 754 to node 753 to output the remaining symbols of the 20 ms frame. Such interleaved frames are inserted into the power controller 715 which outputs the 5 ms frame symbols as they are and outputs the remaining 20 ms frame symbols with increased power. As a result, the encoded 20 ms frame output from that encoder 712 is drilled as shown in deletion matrix # 2. More specifically, said selector 714 sequentially receives symbols output from the first, fifth, ninth, thirteenth, seventeenth, twenty-first, twenty-fifth and twenty-ninth delays on the interleaver 713 and outputs the symbols received to the controller. 715 in response to a first select signal. Further, such selector 714 outputs the delayed 5 ms frame symbols on delay 751 to said power controller 715 in response to a second select signal. Then selector 714 receives in sequence the symbols from the third, seventh, eleventh, fifteenth, nineteenth, twenty-third, twenty-first, fourth, eighth, twelfth, sixteenth, twentieth, twenty-fourth, twentieth eighth and thirty-second delays on interleaver 713 and outputs received symbols to power controller 715 in response to the first select signal. In other words, this fact alludes to the fact that the symbols of the second, sixth, tenth, fourteenth, eighteenth, twenty-second, twenty-sixth and thirtieth delays correspond to the duration # 2 of the deleted 20 ms frame.

Performance of such a frame interleaving scheme depends on the encoder polynomial generator and the interleaver. When drilling is performed according to various types of the suppression matrices with respect to a polynomial generator, the suppression matrix having good performance measurement is selected for the respective cases and then said interleaver is designed accordingly.

Figures 14A and 14B illustrate the performances of the perforated frames employing the deletion matrix # 1 and the deletion matrix # 2, respectively. More specifically, Figure 14A illustrates the performance of the interleaver designed using suppression matrix # 1 for the respective interleaved cases # 1-3. Figure 14B illustrates the performance of the interleaver designed using suppression matrix # 2 for the respective interleaved cases # 1- # 3.

Figures 14A and 14B both show that interleaved case # 1 provides the best performance and interleaved case # 3 provides the worst performance. For example, Table 6 shows a signal to noise ratio (Bb / No) for the respective interleaved cases when a probability of error is 0.01 (= 1%). From table 6, it is noted that better performance is obtained when using suppression matrix # 1 rather than suppression matrix # 2. In addition, case # 1 is superior in performance to case # 2, and case # 2 is superior to case # 3. Here, the numerals in the 'Remarks' in Table 6 represent the differences in signal-to-noise ratios between the best performing and worst performing systems, including the IS-95 system. Since the highest performing system has the difference low performance. that higher performance can be expected when using suppression matrix # 1 rather than suppression matrix # 2. Accordingly, in the preferred embodiment, the symbol distributor is designed according to deletion matrix # 1 in the frame matrix scheme. (0001061 As described above, when the 5 ms frame message and the 20 ms frame message are output simultaneously, the dedicated control channel transmitter outputs the 5 ms frame message at the corresponding time, and then In addition, it transmits the remaining 20 ms frame message with increased power Here, since the frame message was encoded at the 1/3 encoding rate in the encoding process, the receiver can perform error correction with respect to In order to improve error correction capability, the second interleaved! 522 should be designed in such a way as to evenly disperse the encoded data. Although Figures 8A and 8B show examples of interleaving the frame message. 5 ms and the 20 ms frame message could be understood that the frame message transmission capability is excellent even in the case where said 5 ms frame message and said 20 ms frame message ms are outputs successively, (000107] Figure 5 illustrates the structure of the dedicated channel transmission device for direct connection (from base station to mobile station). The dedicated direct channel control transmission device should perform a operação PCB7 drilling operation for a control of a mobile station transmission power. On the other hand, a dedicated reverse channel transmission device (from mobile station to base station) does not have to perform PCB insertion operation. Accordingly, the dedicated reverse channel transmission device (mobile station) has a similar structure to that of the dedicated direct control channel transmission device except for the PCB insertion scheme, the S / P converter. (for multiple carriers), the spreader structure, and the convolutional encoder encoding rate. In the embodiment, such a forward link encoder encoding rate is 1/3 and the reverse link encoder encoding rate is 1/4. 10001081 In a frame message transmission using reverse dedicated channel, the dedicated reverse channel transmission device also determines the frame duration according to the frame message size and transmits the frame message according to said determination. In addition, the dedicated reverse channel transmission device examines a presence / absence of the frame message for transmission over the reverse dedicated channel to suppress one. output that reverse dedicated channel when there is no frame message to transmit, and to form an output path to the reverse dedicated channel only when there is an actual frame message to transmit. Shown in Figure 5 is the multi-carrier dedicated channel transmission device for reverse linkage and shown in Figure 7 is the single-carrier dedicated channel transmission device for reverse linkage. Accordingly, it is also possible to construct a single-carrier dedicated channel transmission device for forward linkage and a multi-carrier dedicated channel transmission device for reverse linkage.

[000110] A device for receiving control signals transmitted via the forward or reverse dedicated channel should determine the duration of the frame message for processing the control signal. That dedicated channel receiving device for forward or reverse link may be constructed as shown in Figure 15, Referring to Figure 15, a scrambler 911 splits a received signal using a PN sequence and orthogonal code to. receive a dedicated channel signal. A diversity combiner 913 combines the multipath signal output from the scrambler 911. A moderate decision generator 915 quantifies the received signal into a multi-level digital value for decoding the received signal. A first deinterleaver 917 sized to process the 5 ms frame message disengages said interleaved 5 ms frame message during transmission to rearrange the bits to their original state. A second deinterleaver 918 sized for processing the 20 ms frame message disengages said interleaved 20 ms frame message during transmission to rearrange the bits to their original state. 1000112J A timer 919 generates control signal to decode the data received through the dedicated channel at fixed periods. Here, said timer 919 is a 5 ms timer capable of decoding the 5 ms frame. A first decoder 921 is enabled by the control signal output from said timer 919 and decodes the frame message output from the first deinterleaver 917. decoder 921 decodes the first duration frame message of 5 ms. A second decoder 923 is enabled by the control signal output from timer 919 and decodes the frame message output from the second deinterleaver 918. The second decoder 923 then decodes the 20 ms second duration frame message. A first CRC detector 925 receives an output from the first decoder 921 and checks said CRC for the 5 ms frame. A second CRC detector 927 receives an output from the second decoder 923 and checks the CRC for the 20 ms frame. Here, the first and second CRC detectors 925 and 927 output either a true signal "1" or a false signal "0" as the result signal. While the invention has been described with reference to an embodiment which determines the duration of the received frame message by detecting the CRC bit, it is also possible to determine the frame duration, e.g. Also, whether or not there is the frame when calculating the signal energy received in the first and second frame message durations. 10001131 A frame duration decision block 929 analyzes the output signals from the first and second CRC detectors 925 and 927 to decide the duration of the frame message received through the dedicated channel. Frame duration decision block 929 generates a sell select signal to select first decoder 921 when first CRC detector 925 outputs true signal, generates a sel2 select signal to select second decoder 923 when second CRC detector 927 outputs true signal, and generates a DISABLE signal to interrupt the outputs of first and second decoder 921 and 923 outputs when said first and second CRC detectors 925 and 927 both generate the false signal.

A selector 931 selects the decoded data output from said first and second decoders 921 and 923 according to the output signals of frame duration decision block 929. That is, selector 931 selects the output of the first decoder 921. when the received frame is a 5 ms frame, selects the output of the second decoder 923, when the received frame is a 20 ms frame, and interrupts the outputs of both first and second decoders 921 and 923 for the period during which the message of frame is not received, 1000115 | A modem controller 933 stores the frame message received from the decoded data output from selector 931 in a message buffer 935. The upper layer processor then reads and processes the control message stored in message buffer 935. In addition, when the first frame message is interleaved with the second frame message, modem controller 933 outputs the first frame message in response to select signal 1 and the second frame message in response to the selector signal si 2, [000116J] Now, the operation of the dedicated channel receiving device will be described hereinafter with reference to Figure 15.0. The 911 scrambler receives the control signal through the dedicated channel, and the control signal received with the sequence FN, Control signals received through the dedicated channel are restored to the original frame message by reverse processing. streaming. Here, the first and second deinterleavers 917 and 918 are sized to process the 5 ms and 20 ms frame messages respectively. (0001171 Subsequently, at the base station and mobile station, the first decoder 921 decodes the 5 ms frame and the second decoder 923 decodes the 20 ms frame to process the frame message. Said first and second CRC detectors 925 and 927 then perform CRC checking for decoded data output from that first and second decoders 921 and 923, respectively, and output result values to frame duration decision block 929. That frame duration decision block 929 then decides the frame duration of the received frame message according to the CRC verification results. (000118] When the interleaved frame messages of the first duration frame message and the second duration frame message are received, the first detector dc CRC 925 and the second CRC 927 detector alternately generate the true signal for the duration of 20 ms. In this case, the dc block frame duration decision 929 generates the selector signals si 1 and sel2 according to the output signals of said first and second CRC detectors 925 and 927. Selector 931 then selects the outputs of those first and second decoders 921 and 923 of according to said sell and sel2 selection signals. Modem controller 933 also selectively outputs the first duration frame message and the second duration frame message to message buffer 935 according to said frame duration decision block sell and sel2 select signals 929. That is, when the interleaved frame message is received, the dedicated channel receiving device determines the frame duration and separately processes the first duration frame message and the second duration frame message as determined. (0001191 When CRC5 is assumed to denote CRC verification result for 5 ms frame and CRC20 denotes verification result for 20 ms frame, frame duration decision block 929 will generate selection signals as shown. Table 7. As shown in Table 7, when CRC5 and CRC20 are both detected (ie true), the frame duration decision block does not determine the corresponding state, however, when CRC5 and CRC20 are both true, it is also possible to determine the received frame as the 5 ms frame and determine both received frames. 1000121] Figure 16 illustrates a simulation result for processing variable duration frame messages received through the dedicated channel. Referring to Figure 16, a yield comparison result is shown when the 5 ms frame is used and when the 20 ms frame is used for such a cane. 1. The direct packet traffic channel here has a data rate of 307.2 kbps, a fixed frame rate of 20 ms and 1% FER (Frame Error Rate).

As described above, the CDMA mobile communication system according to the present invention has the following advantages; (1) It is possible to increase productivity and reduce dedicated channel traffic delay by generating frame messages of different durations according to the size of the message transmitted on the dedicated channel; (2) Use of the dedicated control channel is discontinuously controlled according to the presence / absence of the frame message for transmission. Thus, radio capacity can be increased by DTX transmission mode; (3) When multiple frame messages of different durations are generated, the generated frame messages are interleaved with each other, thereby reducing the transmission time of the frame messages. [0001231] While the invention has been shown and described with reference to In a particular preferred embodiment thereof, it will be understood by those skilled in the art that various changes in shape and detail may be made therein without departing from the scope of the invention as defined by the appended claims. For example, while the above embodiments have been described in connection with a CDMA communication system, invention is contemplated for use with other spread spectrum or non-spread spectrum wireless telecommunication systems.

Claims (32)

1. Transmission device for such a code division multiple access (CDMA) communication system, characterized in that it comprises; a first message generator (550) for encoding first input data of a first bit stream to generate a first frame message reading a first frame duration; - a second message generator (560) for encoding second input data of a second bit stream longer than the first bit stream to generate a second frame message that has a second longer frame duration than the first one. frame duration; a multiplexer (523) for replacing a portion of that second frame message with that first frame message; and - a spreader (533, 535) for spreading an output of that multiplexer. Transmission device according to claim 1, characterized in that the first frame message and the second frame message are multiplexed when said first frame message is generated during transmission of the second frame message. Transmission device according to claim 1, characterized in that the multiplexer (523) integrally outputs a portion of the second frame message, the first replaced frame message and a remainder of the second message in sequence. of frame. Transmission device according to Claim 1, characterized in that the multiplexer (523) interchangeably outputs the first replaced frame message and the second frame message, of which one part corresponds to the first frame message. is deleted. Transmission device according to claim 3 or 4, further comprising a power controller (513) for increasing transmission power of the remainder of the second frame message following the first replaced frame message. , to be higher than that of the first message on the board. Transmission device according to claim 1, characterized in that the remaining part of the second frame message following the first replaced frame message is discarded. Transmission device according to claim 1, characterized in that the first frame message has a frame duration of 5 ms and the second frame message has a frame duration of 20 ms. Transmission device according to claim 1, characterized in that the second frame message generator (560) comprises: - a cyclic redundancy check (CRC) generator (516) for generating CRC bits according to with the second input data of the second frame duration; an end bit generator (518) for generating end bits and adding the generated end bits to an output of the CRC generator (516); a channel encoder (520) for encoding the second frame data added with end bits at a predefined encoding rate; and - an interleaver (522) for interleaving the encoded frame message for the second frame duration. Transmission device according to claim 8, characterized in that the interleaver (522) uniquely distributes generated symbols by encoding a data bit over the respective whole frame durations. Transmission device according to claim 9, characterized in that the interleaver (522) is designed according to a suppression matrix given by Transmission device according to claim 1, characterized in that the spreader (533, 535) comprises: - an orthogonal code palette (533) for spacing the output of the message. muhiplexer frame (523) with an orthogonal code for a dedicated control channel; and - a pseudo random noise spreader (PN) (535) for spreading an orthogonal code spreader output with a PN sequence, Transmission device according to claim 1, characterized in that the transmitter comprises: - an orthogonal code spreader (533) for spreading the frame message output of the muhiplexer (523) with an orthogonal code for a traffic channel; and - a PN spreader (535) for spreading an output of said orthogonal code spreader (533) with a PN sequence, Transmission device according to claim 12, characterized in that the traffic channel is a fundamental channel. A method for transmitting data in a wireless communication system, characterized in that it comprises the steps of: encoding first input data of a first bit stream to generate a first frame message having a first frame duration. ; encoding second input data a second bit stream longer than the first bit stream to generate a second frame message having a second frame duration longer than the first frame duration; replacing a part of the second frame message with the first frame message; and - transmitting the first frame message in place of the replaced part of the second frame message. Method according to claim 14, characterized in that the first frame message and the second frame message are multiplexed when the first frame message is generated during transmission of the second frame message. Method according to claim 14, characterized in that a part of the second frame message, the first frame message and a remaining part of the second frame message are output interleaved sequentially in said replacement step. Method according to claim 14, characterized in that the first frame message and the second frame message, of which a part corresponding to the first frame message is deleted, are output sequentially in sequence to said replacement step, The method of claim 16 or claim 17 further comprising the step of increasing a transmit power of the remainder of the second frame message, which follows the first frame message, to be more higher than that of the first message on the board. Method according to claim 14, characterized in that the remaining part of the second frame message, which follows the first frame message, is discarded in said substitution step. Method according to claim 14, characterized in that the first frame message has a frame duration of 5 ms and the second frame message has a frame duration of 20 ms. Method according to claim 20, characterized in that a portion of the second frame message is deleted to insert the first frame message into the deleted part for a second duration, and the remaining portion of the second frame message is deleted. output to third and fourth durations in said replacement step. The method according to claim 21, wherein a portion of the second frame message is deleted to insert the first frame message into the deleted part for a first duration, and the remaining part of the second frame message is deleted. output to second, third and fourth durations in said replacement step. The method of claim 21 or claim 22 further comprising the step of increasing the transmit power of the remainder of the second frame message, which follows the first inserted frame message, Method according to claim 14, characterized in that the step of generating the second frame message comprises the steps of: - generating CRC bits according to second input data of the second frame duration; generating end bits and adding the generated end bits to those second data added with CRC bits; encoding the second frame data added with end bits at a predefined encoding rate; and interleaving symbols of the second frame data encoded by the second frame duration. Method according to Claim 24, characterized in that symbols generated by encoding a data bit are uniformly distributed over the respective lengths of the entire frame at said interleaving step. Process according to claim 25, characterized in that said symbols are distributed according to a suppression matrix given by A method according to claim 14, characterized in that the transmission step comprises the steps of: - spreading the frame message with an orthogonal code to a dedicated control channel; and - spreading an orthogonal scattered signal with a PN sequence. Method according to claim 15, characterized in that the transmission step comprises the steps of: - spreading the frame message with an orthogonal code to a traffic channel; and - spreading an orthogonal scattered signal with a PN sequence. A method according to claim 28, characterized in that the traffic channel is a fundamental channel. Method according to claim 14, characterized in that the wireless communication system is a CDMA communication system. Process according to claim 14, characterized in that said second frame message is delayed as a result of said substitution. Method according to claim 14, characterized in that the replaced part of said second frame message is not transmitted such that a final part of that second frame message is transmitted in a non-delayed manner.