KR100576027B1 - Apparatus and method for acquisition indication in cdma syatem - Google Patents

Abstract

In a packet common channel communication method of a code division multiple access communication system, a mobile station transmits a preamble for accessing a base station, receives channel allocation information received from the base station in response to the preamble, and receives power control information transmitted from the base station. After allocating a control channel receiver and a reverse packet common channel transmitter for transmitting a message, the message is transmitted through the reverse packet common channel transmitter and the reverse common channel transmitter is transmitted by the power control information received through the control channel receiver. Control power.

Common Packet Channel, Collision Detection Preamble, Channel Assignment AICH, Collision Detection AICH, Signature,

Description

Acquisition notification device and method of code division multiple access communication system {APPARATUS AND METHOD FOR ACQUISITION INDICATION IN CDMA SYATEM}             

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a diagram illustrating a signal transmission / reception relationship between a reverse common channel and a forward common channel of a code division multiple access communication system

2 is a diagram illustrating a signal transmission / reception relationship between a reverse common channel and a forward common channel in a code division multiple access communication system;

3 is a diagram illustrating a signal transmission / reception relationship between a reverse common channel and a forward common channel of a code division multiple access communication system according to an embodiment of the present invention.

4 illustrates the preamble structure of FIG. 3.

5A is a diagram illustrating an AICH frame structure according to an embodiment of the present invention, and FIG. 5B is a diagram illustrating a structure of an AICH generator for generating an AICH signal.

6A-6C illustrate an example implementation of channel allocation AICH.

7 illustrates a structure of a mobile station for transmitting a message through a common channel in a code division multiple access communication system according to an embodiment of the present invention.

8 is a diagram illustrating a structure of a base station transmitting a message through a common channel in a code division multiple access communication system according to an embodiment of the present invention.

9 illustrates another embodiment of the present invention in which a CD-AICH and a CA-AICH are combined to designate a channel.

10 is a diagram illustrating another structure of a reverse common channel and a forward common channel of a code division multiple access communication system according to an embodiment of the present invention.

FIG. 11 illustrates a structure for generating a CD / CA-AICH signal in FIG. 10. FIG.

12A and 12B illustrate an embodiment of a structure for efficiently transmitting a CD-AICH and a CA-AICH.

FIG. 13 is a diagram showing the structure of a signature used in AICH

14 illustrates a receiver structure of an AICH channel according to the first embodiment of the present invention.

15 is a diagram illustrating a receiver structure of an AICH channel according to a second embodiment of the present invention.

FIG. 16 illustrates a first implementation of allocating multiple CPCHs according to an embodiment of the present invention. FIG.

17 is a diagram illustrating a second embodiment of allocating multiple CPCHs according to an embodiment of the present invention.

FIG. 18 is a diagram illustrating an embodiment in which a CD-AICH and a CA-AICH are combined and transmitted as one AICH as shown in FIG. 12A.

The present invention relates to a common channel communication apparatus and method of a code division multiple access communication system, and more particularly, to an apparatus and method for communicating data through a common channel in an asynchronous code division multiple access communication system.

A random access channel is a reverse common channel in a wideband code division multiple access (W-CDMA) communication system, which is a current generation mobile communication. : Hereinafter referred to as RACH).

1 is a diagram illustrating a communication signal transmission / reception relationship of a conventional asynchronous reverse common channel. In FIG. 1, reference numeral 151 denotes a signal transmission procedure of a reverse channel, and the channel may be an RACH. 111 denotes a forward channel, in which an Access Preamble Acquisition Indication Channel (hereinafter referred to as AICH) receives and responds to a signal from the random access channel.

Referring to FIG. 1, the random access channel RACH waits for a response from the base station after transmitting a preamble of a predetermined length as shown in 162 of FIG. 1. If there is no response from the base station for a certain period of time, the transmission power is increased to retransmit the preamble signal. When the base station detects a preamble transmitted through the random access channel RACH, as shown in 122 of FIG. 1, the base station transmits a signature of the detected preamble through the AICH of the forward link. Meanwhile, the mobile station checks whether a signal transmitted by the base station is received in response to the transmitted preamble. When the AICH signal is received, the signature is demodulated. At this time, if the signature corresponding to the preamble transmitted through the RACH is detected through the AICH signal, the mobile station determines that the preamble is detected by the base station, and transmits a message on the reverse access channel.

However, if the mobile station receives the AICH signal transmitted by the base station within the set time (tp-ai) after transmitting the preamble 162 and does not detect a signal using the signature transmitted by the mobile station, the mobile station determines that the base station transmits the preamble. It is determined that the signal is not detected, and the preamble is transmitted again after the set time. At this time, the mobile station increases power by ΔP (dB) than the power of the preamble transmitted in the previous state, retransmits the preamble as shown in 164, receives the AICH signal transmitted by the base station within the set time, and uses the signature transmitted by the mobile station. Detect. Therefore, if the AICH signal using the signature transmitted by the mobile station is not received from the base station after transmitting the preamble, the mobile station repeats the above operation while delaying the set time and increasing the transmit power of the preamble. In the process of transmitting the preamble and receiving the AICH signal as described above, when a signal using the signature transmitted by the mobile station is received, the mobile station delays a time set as shown in 170 and then corresponds to the message of the reverse common channel corresponding to the preamble. Transmit with power.

As described above, when the preamble is transmitted using the random access channel, the preamble can be efficiently detected, and initial power setting for the message of the reverse common channel can be facilitated. However, since the random access channel does not have power control, it is difficult to transmit packet data having a high transmission rate and a transmission time longer than a certain length.

To this end, a method of power control of a reverse common channel using a W-CDMA scheme has been proposed. This is called a common packet channel (hereinafter referred to as CPCH). The purpose of the CPCH is to enable power control of the reverse common channel to enable transmission of a high data rate data channel for a predetermined time (about 100-500 ms). This is to send a message below a certain size quickly by using a reverse common channel without allocating a dedicated channel. That is, in order to set the dedicated channel, many related control messages must be transmitted and received. The exchange of control messages is a great overhead for transmitting a relatively small amount of data of tens or hundreds of ms. Therefore, when transmitting data of a certain size or less, it may be more effective to transmit the data through a common packet channel.

However, since the common packet channel is a channel shared by a plurality of terminals, collision between reverse channels should be avoided as much as possible. Figure 2 shows a conventional signal transmission procedure of the forward and reverse channels to avoid such a collision. In FIG. 2, a collision detection preamble (Collision Detectio preamble) is used.

Referring to FIG. 2, the mobile station transmits access preambles 262 and 264 in the same manner as in FIG. If the base station detects the preamble 264, it transmits an AICH as shown in 222. The mobile station receives and demodulates the AICH signal. In this case, the mobile station may think that the base station has detected its preamble, but another mobile station may transmit the same preamble at the same time point as the mobile station, so that the base station transmits an ACK. That is, the mobile station cannot know whether the base station actually detected the preamble transmitted by the mobile station. That is, two or more mobile stations may determine that the base station has received the access preamble transmitted by the base station and transmit a message.

In order to reduce the probability of such a collision, the mobile station receives the ACK for the access preamble through the AICH and transmits the CD preamble as shown in 266. That is, the mobile station randomly selects the collision detection preamble and transmits the received response signal of the AICH from the base station to the base station. When the base station transmits the AICH signal and receives the CD preamble, the base station transmits to the mobile station through another CD-AICH as a response signal corresponding to the CD preamble. At this time, if the number of CD preambles selectable by the mobile station is 16, there is an advantage that the probability of collision between the two mobile stations can be reduced by 1/16.

In this case, when the mobile station receives an ACK for the CD preamble transmitted through the CD-AICH, the mobile station transmits a message through the common packet channel CPCH after a predetermined time. The common packet channel CPCH is composed of power control data and information data, and one of the reverse common channels is capable of transmitting a high data rate signal over a predetermined time (from tens to hundreds of ms) while controlling power as one of the reverse common channels. It means channel. The base station allocates a dedicated physical control channel (DPCCH) of the forward link at the same time and transmits a power control command such as 230, and the mobile station outputs the power control command through the common packet channel CPCH.

As described above, when transmitting a message through a common channel, the base station should allocate a forward channel for power control of the common packet channel CPCH. In FIG. 2, the forward channel is assumed to be a dedicated physical control channel (hereinafter referred to as DPCCH). In addition, allocation of a reverse common packet channel for transmitting a message by the mobile station is also a problem. That is, when allocating a forward channel for the common packet channel CPCH, a specific forward channel may be mapped according to an access preamble or a collision detection preamble transmitted by a mobile station. In this case, there is a point that the part that can be determined and controlled by the base station managing the system resource is not efficient for channel allocation.

The method shown in FIG. 2 enables power control of the channels for efficiency of the reverse common channel or the common packet channel, and also uses the collision detection preamble and the ACK through the CD-AICH to reduce the collision of the reverse link signal. It was. However, for efficient use of the common packet channel, proper allocation of channels on the forward link and the reverse link is an important problem.

The AICH uses the signature of the reverse preamble as the forward link. 13 shows the signatures of the AICH. In the above process, the mobile station receiver only needs to detect the signature of the preamble transmitted by the mobile station in the AICH. Therefore, the receiver does not have to consider the complexity of the receiver. However, if the base station can transmit one of several signals through the AICH, the mobile station needs to detect a plurality of signatures, so the structure of the AICH considering the complexity of the mobile station receiver is necessary.

Accordingly, an object of the present invention is to provide an apparatus and method for transmitting a message through a common channel in a code division multiple access communication system.

It is an object of the present invention to provide a forward link acquisition notification channel in which a receiver of a mobile station can receive an acquisition notification channel with low complexity.

SUMMARY OF THE INVENTION An object of the present invention is to provide a method for receiving a mobile station which can simplify the detection of several signatures transmitted on an acquisition notification channel of a forward link.

Another object of the present invention is to provide a channel allocation method for efficient power control of a reverse common channel for transmitting a message through a common channel in a code division multiple access communication system.

Another object of the present invention is to provide an apparatus and method for allocating a channel to transmit a message through a reverse common channel in an asynchronous code division multiple access communication system.

It is still another object of the present invention to provide an apparatus and method for transmitting and receiving by combining a single code for collision detection and channel allocation of a reverse common packet channel in a code division multiple access communication system.

It is still another object of the present invention to provide a method of dividing a reverse common channel into a plurality of groups and efficiently managing each group.                         

Another object of the present invention is to provide a method for dynamically managing radio resources allocated to a reverse common channel.

Another object of the present invention is to provide a method for a base station to inform a mobile station of the current state of a reverse common channel.

It is still another object of the present invention to provide a method for a mobile station to determine whether to use a reverse common channel by using a state of a reverse common channel informed by a base station.

Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.

In an embodiment of the present invention, when a mobile station transmits a message on a reverse common channel, the mobile station transmits a preamble, the base station captures the response, and then the base station controls power of the reverse common channel and the reverse common channel to be used by the mobile station. Allocate a forward channel for In this case, the mobile station receives the channel assignment message to the base station after transmitting the preamble, transmits the message through the assigned channel and transmits the reverse common channel according to the power control command received through the assigned forward channel. Power is controlled.

Here, the preamble transmitted from the mobile station may be a collision detection preamble CDP with an access preamble AP, and the base station generates an AP-AICH in response to the access preamble AP, and generates a CD-AICH in response to the laminar detection preamble CDP. It is assumed that after the CD-AICH is transmitted, CA-AICH for allocating such a channel is generated. Of course, if there are multiple access preambles that can be transmitted by the mobile station, the preamble transmitted by the mobile station may be an access preamble AP, and the base station generates an AP-AICH in response to the access preamble AP and generates the AP-AICH. After transmission, CA-AICH for allocating such a channel may be generated.

3 is a diagram illustrating a signal flow between a mobile station and a base station for a reverse common packet channel or a reverse common channel proposed in an embodiment of the present invention. In the embodiment of the present invention, it is assumed that a common packet channel is used as an example of the reverse common channel. However, the reverse common channel may be applied to other common channels other than the common packet channel.

Referring to FIG. 3, the mobile station adjusts the timing of the forward link through a forward broadcasting channel and acquires information of the reverse common channel or common packet channel. The information on the reverse common channel includes information on the number of spreading codes and signatures used in the access preamble, the AICH timing of the forward link, and the like. When the mobile station needs to transmit a signal through a common packet channel, it first transmits an access preamble AP as shown in 362 of FIG. 3. The access preamble AP is spread with a spreading code unique to a base station, which is multiplied by a signature.

In an embodiment of the present invention, one bit of the signature is maintained for 256 chip intervals, which are spread by a spreading code designated for each base station. 4 (a) shows the structure of the preamble.

Referring to FIG. 4 (a), the spreading code may use a sequence of 256 lengths and may use a long code that does not repeat during the preamble length. In the W-CDMA system, since the reverse common channel is divided into a random access channel RACH and a common packet channel CPCH, a spreading code used for the random access channel RACH and a spreading code used for the common packet channel CPCH are distinguished. The two channels can be distinguished. In addition, even if the same spreading code is used, two types of reverse common channels having different properties may be distinguished by different signatures for random access channel RACH and signatures for common packet channel CPCH.

When the mobile station wants to transmit data on the common packet channel CPCH, the mobile station transmits the access preamble AP at the initial power P0 as shown in 362 according to the base station timing. If the base station detects the access preamble AP, the base station sends an ACK signal to the AICH corresponding to the access preamble AP. At this time, if the capacity of the reverse link of the base station is exceeded or if there is no more demodulator, it transmits a NAK signal to temporarily stop the reverse common channel transmission of the mobile station.

At this time, if the base station does not detect the access preamble AP, it is unable to send an ACK signal to the AICH such as 322. In this case, it is assumed that the embodiment of the present invention transmits nothing to the AICH.

Accordingly, the mobile station monitors the AICH of the forward link after transmitting the access preamble on the random access channel RACH of the reverse link. At this time, the mobile station demodulates the AICH corresponding to the transmitted access preamble AP. If the mobile station does not receive the AP-AICH from the base station (i.e., the base station has not transmitted any signal), the mobile station has a predetermined time (tp-p). After that, the power is increased by ΔP with the power of P1 (P1 = P0 + ΔP) and transmitted again by access preamble AP. If the base station transmits the NAK, the base station does not transmit the reverse common packet channel for a predetermined time and retry again. Here, the predetermined time may be set to the same time as tp-p or may be set to another time. However, when the base station detects the access preamble AP, it transmits an ACK to the AP-AICH as shown in 322. At this time, if the mobile station receives the ACK by the AI-AICH, the mobile station assumes that the base station has acquired the signal of the mobile station and performs the next step.

When the mobile station receives the ACK on the AI-AICH, it transmits a CD preamble on the reverse link. There may be several CD preambles, and the mobile station arbitrarily selects and transmits one of them. In the embodiment of the present invention, it is assumed that the CD preamble is transmitted with a spreading code different from that of the access preamble AP, which is distinguished by a signature. The reason for transmitting the CD preamble as described above is that even if two or more mobile stations transmit the access preamble AP, the probability of selecting the same CD preamble is reduced. That is, if there are N2 CD preambles, the probability of collision is further reduced by 1 / N2.

When the mobile station transmits the CD preamble as described above, the base station detects and demodulates the CD preamble transmitted by the mobile station. At this time, if the base station detects the CD preamble, the base station transmits a response corresponding to the CD preamble transmitted by the mobile station on the forward link as shown in response to the 324. At this time, the response of the base station is called CD-AICH. The CD-AICH generated as shown in 324 of FIG. 3 informs the mobile station of the acquisition by transmitting a signature of the CD preamble on the forward link like the AP-AICH transmitting a response to the access preamble AP. In this case, the CD-AICH may be spread using an orthogonal channel different from the AP-AICH, and thus the CD-AICH may be transmitted on a physical channel different from the AP-AICH. In addition, by using one orthogonal channel as time division, the CD-AICH may be transmitted through the same channel as the AP_AICH.

In the embodiment of the present invention, a case of transmitting the CD-AICH on a physical channel different from the AP-AICH will be described. That is, it is assumed that both the CD-AICH and the AP-AICH are spread with 256 length orthogonal spreading codes and transmitted on independent physical channels. The mobile station can then identify this CD-AICH and transmit the common packet channel with a lower probability of collision.

After transmitting the CD-AICH as shown in step 324, the base station transmits a channel assignment command through a channel assignment-acquisition indication channel (CA-AICH) by delaying a predetermined time (tcd-ca). The channel allocation command transmitted through the CA-AICH includes allocation information of a forward channel allocated for power control of a common packet channel CPCH. The forward link allocated for the control of the common packet channel CPCH may have various forms.

First, use a forward shared power control channel. As described above, the method of controlling the power of the channel using the common power control channel may use the method of Korean Patent Application No. 1998-10394 filed by the present applicant. In addition, a power control command for the reverse common packet channel CPCH may be transmitted using the common power control channel. The forward channel assignment may include channel number and timeslot information of forward common power control used for power control.

Second, the time-divided channel can be used as a forward control channel with a message and a power control command. In the W-CDMA system, this channel is already defined for the control of the forward shared channel (DSCH). Even when data and power control commands are time-divided and transmitted, the channel information includes channel numbers and timeslot information of the forward control channel.

Third, one channel in the forward direction may be allocated for control of the common packet channel CPCH. Through this channel, power control commands and control commands may be transmitted together. In this case, the channel information is the channel number of the forward channel.

In an embodiment of the present invention, the channel assignment command transmitted through the CA-AICH after the CD-AICH is transmitted after a predetermined time (tcd-ca) from the CD-AICH. In this case, tcd-ca may be set to 0 or CA-AICH may be transmitted on a channel independent of the CD-AICH. In addition, in order to reduce the delay in processing the message of the upper layer, it is assumed that the channel assignment command transmitted through the CA-AICH is transmitted in the form of a CD-AICH. In this case, if there are 16 signatures and 16 such CPCHs, each CPCH corresponds to one signature each. For example, if a base station wants to allocate a CPCH for transmitting a message to a terminal, and wants to allocate a CPCH 5, the base station transmits a fifth signature corresponding to the channel assignment command.

In this case, it is assumed that two frames (20ms) of the CA-AICH to which the channel assignment command is transmitted are configured with 15 slots, and each slot is configured with 20 symbols. In this case, the frame for transmitting the preamble (AP, CD preamble) is also composed of 15 slots, one slot may be composed of 20 symbols. A symbol interval is assumed to be 256 chips long, and AICH is assumed to be transmitted only in 16 symbol intervals.

Accordingly, the channel assignment command transmitted as shown in FIG. 3 may consist of 16 symbols, each symbol having a length of 256 chips. In addition, one bit of the signature and a spreading code are multiplied for each symbol and transmitted on the forward link, thereby ensuring orthogonality between the signatures.

5A is a diagram illustrating a frame structure of an AICH. As shown in FIG. 5A, one frame of the AICH is composed of 15 slots, and each slot may be transmitted with zero or more than one signature among 16 signatures. The AICH includes AI-AICH, CD-AICH and CA-AICH as shown in FIG. 3.

FIG. 5B is a diagram illustrating a structure for generating an AICH. It is assumed that the AICH generator generates a channel allocation command of the CA-AICH. As described above, each slot of the AICH frame allocates a corresponding signature among the 16 signatures. Referring to FIG. 5B, the multipliers 501-516 use the corresponding orthogonal codes W1-W16 as the first input, and also use the corresponding capture marks AI1-AI16 as the second input. Therefore, the multipliers 501 to 516 multiply corresponding quadrature codes and the capture display AIs, respectively, and the adder 520 adds the outputs of the multipliers 501 to 516 to output the AICH signal.

The base station may transmit a channel allocation command through the AICH in various ways.

The first method is to transmit a channel assignment command by allocating one channel of the forward link. Transmission of a channel assignment command by the first method as described above is called a channel assignment-AICH (CA-AICH). 6A is a diagram illustrating an implementation example of the first CA-AICH. 6A is a diagram illustrating a transmission frame structure of a CD-AICH transmitting a response signal for a CD preamble, and 613 is a CA-delayed channel assignment command after tcd-ca delay after transmitting the CD-AICH. It is a figure which shows the structure of the frame transmitted on AICH.

In addition, the second method may transmit CA-AICH by allocating slots of channels such as AP-AICH or CD-AICH on the forward link by time division. FIG. 6B shows an example of time-dividing the CD-AICH and the CA-AICH and assigning each slot to transmission. The second method means that some slots of the AP-AICH and the CD-AICH are not used for the original AP or the CD, but are used for channel allocation.

FIG. 6C illustrates a case where the CD-AICH and the CA-AICH are simultaneously transmitted by setting tcd-ca to 0 as described above in the embodiment of FIG. 6A. In the current W-CDMA standard, one symbol of the PA-AICH uses 256 chips in length, and one slot of the AICH can transmit 16 symbols of 256 chips in length. However, 256 length orthogonal codes are used. However, different length symbols may be used for the CD-AICH and CA-AICH. For example, if a total of 16 CD preambles are available and up to 16 CPCHs are allocated, 512 chip length channels can be allocated to the CA-AICH and the CD-AICH, respectively. Can be. At this time, 8 symbols of 512 chip length can be transmitted in each AICH. All 8 signatures orthogonal to each other are allocated and multiplied by the sign of + 1 / -1 to 16 CA-AICH and CD-AICH. It is to be able to transmit. The advantage obtained in this way is that a separate orthogonal code does not have to be assigned to a new CA-AICH.

In assigning 512 chip length orthogonal codes to CA-AICH and CD-AICH, the following method can be used. One 256 length orthogonal code Wi is allocated to CA-AICH and CD-AICH. The 512-length orthogonal code assigned to the CD-AICH is repeated Wi twice. That is, it is an orthogonal code of length 512 of [Wi Wi]. And, the 512-length orthogonal code assigned to CA-AICH is made by connecting Wi station to Wi. That is, an orthogonal code of 512 chip length of [Wi-Wi] is allocated.

In addition, the existing AICH signature may be used in the AICH of FIG. 6C. Figure 13 shows the AICH in the ongoing standard. In the case of CA-AICH, the base station assigns one channel of several CPCHs to the mobile station, so the receiver of the mobile station should attempt to detect several signatures. In the conventional PA-AICH and CD-AICH, the mobile station only needs to perform detection for one signature. However, in case of CA-AICH, all of the possible signatures should be detected, so it is necessary to design or arrange the structure of the signature of AICH to reduce the complexity of the mobile station.

As mentioned earlier, eight of the 16 possible signatures and the signature (+ 1 / -1) multiplied by the signature are assigned the signatures of the 16 CD-AICHs and the sign multiplied by the remaining 8 signatures and signatures + 1 / It is assumed that a signature of CA-AICH for 16 CPCH allocation is allocated through -1.

The first embodiment of the AICH signature of the present invention proposes an assignment in which the mobile station receiver can receive the CA-AICH with low complexity while using the signature of FIG. 13 as it is. Orthogonality is maintained between the signatures of the AICH. Therefore, if the signatures allocated to the AICH are efficiently arranged, the terminal can simply demodulate the CD-AICH through a method such as Fast Hadamard Transform (FHT).

Let's say that the nth signature is Sn, and the nth signature multiplied by -1 is -Sn. An embodiment of the signature assignment to be proposed in the present invention is as follows.

{S1, -S1, S2, -S2, S3, -S3, S14, -S14,

 S4, -S4, S9, -S9, S11, -S11, S15, -S15}

If the number of CPCHs is smaller than 16, the signatures are allocated to the CPCHs from the left. The reason for the above allocation is that the FHT is enabled in the mobile station to minimize the complexity. If you select two, four, or eight signatures from the left among {1, 2, 3, 14, 15, 9, 4, 11}, the number of A's and -A's in the same column is the same except for the last column. . If you rearrange the order of each symbol and multiply it by a random mask, it has a structure of orthogonal codes that can perform FHT.

14 shows the structure of a receiver proposed in the present invention.

The mobile station despreads the input signal for 256 chip intervals to generate symbol Xi with channel compensation. When Xi is referred to as an i symbol input to the mobile station receiver, which is a despread signal of 256 chip lengths, the position converter relocates it as follows.

Y = (X15, X9, X10, X6, X11, X3, X7, X1

     X13, X12, X14, X4, X8, X5, X2, X0}

The multiplier 1427 multiplies the rearranged Y by the following mask generated in the mask generator 1425.

M = {-1, -1, -1, -1, 1, 1, 1, -1, 1, -1, -1, 1, 1, 1, -1, -1}

Then, the signatures of S1, S2, S3, S14, S15, S9, S4, and S11 are converted as follows. The converted signatures are referred to as S'1, S'2, S'3, S'14, S'15, S'9, S'4 and S'11, respectively.

S'1 = 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1

S'2 = 1 1 1 1 1 1 1 1 1 -1 -1 -1 -1 -1 -1 -1 -1

S'3 = 1 1 1 1 1 -1 -1 -1 -1 -1 -1 -1 -1 1 1 1 1

S'14 = 1 1 1 1 1 -1 -1 -1 -1 1 1 1 1 1 -1 -1 -1 -1

S'15 = 1 1 -1 -1 1 1 -1 -1 1 1 -1 -1 1 1 -1 -1

S'9 = 1 1 -1 -1 1 1 -1 -1 -1 -1 1 1 -1 -1 1 1

S'4 = 1 1 -1 -1 -1 -1 1 1 -1 -1 1 1 1 1 -1 -1

S'11 = 1 1 -1 -1 -1 -1 1 1 1 1 -1 -1 -1 -1 1 1

As shown above, it can be seen that by rearranging the order of the input signals and multiplying each symbol by a specific mask, the signatures can be converted into an orthogonal code that can be FHT. In addition, when performing the FHT, there is no need to perform the FHT for the length 16, and when the repeated symbols are added to the FHT, the complexity of the receiver can be further reduced. That is, when 5-8 signatures are used (9-16 CHCH), two symbols are repeated, so if the repeated symbols are added, only the FHT of length 8 needs to be performed. In addition, when 3-4 signatures are used (5-8 CPCH), 4 symbols are repeated, and thus, FHT may be performed after adding semi-compacted symbols. In this way, the complexity of the receiver can be greatly reduced by efficiently disposing an existing signature assignment.

14 is a structure for multiplying a specific mask M after rearranging despread symbols. However, the result is the same even if the specific mask M is multiplied first and then the despread symbols are rearranged. In this case, the difference is that the shape of the mask M to be multiplied is different.

Referring to the operation of the receiver having the structure shown in FIG. 14, the multiplier 1411 multiplies the input of the A / D converter by multiplying the spreading code Wp of the pilot channel and inputs it to the channel estimator 1413 to input the channel size of the forward link. Estimate the phase. The multiplier 1417 multiplies the input signal by the Walsh spreading code of the AICH channel, and the accumulator 1418 accumulates it for a predetermined symbol period (256 chips) to output a despread symbol. The despread AICH symbol is demodulated by multiplying by the complex conjugate of the output of the channel estimator 1413 in the complex conjugate 1415. The demodulated symbol is input to the positioner 1423, which serves to rearrange the input symbols so that the repeated symbols are neighbors. The output of the position converter 1423 is multiplied by the mask output from the mask generator 1425 by the multiplier 1423 and input to the FHT converter 1428. The FHT transformer 1429 takes the output of the multiplier and outputs the signal size for each signature. The control and determination unit 1431 receives the output of the FHT converter 1429 and finds and determines the signature of the CA-AICH most likely to be input. In Fig. 14, the operations are the same even if the positions of the position converter 1423, the mask generator 1425, and the multiplier 1427 are interchanged. Although the mobile station receiver does not change the positions of the input symbols by using the position converter 1423, the position where each symbol is transmitted may be stored and used when performing the FHT.

In the present invention, an embodiment of the CA-AICH signature structure is shown. This is summarized as follows. Generate 2K signatures 2K in length. (If you consider multiplying the sign by + 1 / -1, the number of possible signals can be 2K + 1.) However, if you use only some of the signatures instead of using all the signatures, It is necessary to allocate them more efficiently to reduce them. Suppose we use only M signatures out of all signatures. Where 2L-1 <M <= 2L and 1 <= L <= K. In this case, M signatures having a length of 2K are remuted to transmit each symbol of the Hadamard function having a length of 2L as many as 2K-L times, after repositioning each symbol's position and XORing a specific mask to each bit. To form. Therefore, the object of the present invention is to enable the receiver to simply perform FHT by multiplying received symbols by a specific mask and repositioning each symbol.

In addition, another method of transmitting the AICH is to use a signature different from the signature used for the preamble. In other words, use the Hadamard function as a signature. The Haramard function is made in the following form.

Hn = Hn-1 Hn-1

        Hn-1 -Hn-1

H1 = 1 1

        1 -1

Then, the HADAMARD function of length 16 required in the embodiment of the present invention is as follows. The following signature may be expressed in the form of multiplication of the gain A of the AICH channel. In this case, 1 is replaced by A and -1 by -A.

1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 => S1

1 -1 1 -1 1 -1 1 -1 1 -1 1 -1 1 -1 1 -1 => S2

1 1 -1 -1 1 1 -1 -1 1 1 -1 -1 1 1 -1 -1 => S3

1 -1 -1 1 1 -1 -1 1 1 -1 -1 1 1 -1 -1 1 => S4

1 1 1 1 -1 -1 -1 -1 1 1 1 1 -1 -1 -1 -1 => S5

1 -1 1 -1 -1 1 -1 1 1 -1 1 -1 -1 1 -1 1 => S6

1 1 -1 -1 -1 -1 1 1 1 1 -1 -1 -1 -1 1 1 => S7

1 -1 -1 1 -1 1 1 -1 1 -1 -1 1 -1 1 1 -1 => S8

1 1 1 1 1 1 1 1 -1 -1 -1 -1 -1 -1 -1 -1 => S9

1 -1 1 -1 1 -1 1 -1 -1 1 -1 1 -1 1 -1 1 => S10

1 1 -1 -1 1 1 -1 -1 -1 -1 1 1 -1 -1 1 1 => S11

1 -1 -1 1 1 -1 -1 1 -1 1 1 -1 -1 1 1 -1 => S12

1 1 1 1 -1 -1 -1 -1 -1 -1 -1 -1 1 1 1 1 => S13

1 -1 1 -1 -1 1 -1 1 -1 1 -1 1 1 -1 1 -1 => S14

1 1 -1 -1 -1 -1 1 1 -1 -1 1 1 1 1 1 -1 -1 => S15

1 -1 -1 1 -1 1 1 -1 -1 1 1 -1 1 -1 -1 1 => S16

Eight of the above Hadamard functions are assigned to the CD-AICH and the remaining eight are assigned to the CA-AICH. At this time, the sequence of allocating the signature of CA-AICH is as follows.

{S1, S9, S5, S13, S3, S7, S11, S15}

The signature is then assigned to the CD-AICH as follows.

{S2, S10, S6, S14, S4, S8, S12, S16}

Here, the signature of CA-AICH is allocated from the left side. The reason for the above allocation is that the FHT is enabled in the mobile station to minimize the complexity. If you select 2, 4, or 8 signatures from the left for the CA-AICH signature above, the number of A's and the number of A's are the same except for the last column. The number of signatures used simplifies the structure of the mobile receiver.

In addition, the signature may correspond to a forward channel or CPCH for CPCH control in another form. For example, the signature assignment used for CA-AICH is as follows.

  [1, 9] => use up to two signatures

  [1, 5, 9, 13] => use up to 4 signatures

  [1, 3, 5, 7, 9, 11, 13, 15] => use up to 8 signatures

If all NUM_CPCH CPCHs are used (1 <NUM_CPCH <= 16), then the signature corresponding to the kth (k = 0, ...., NUM_CPCH-1) CPCH (or forward channel for control of CPCH) The + 1 / -1 sign to be multiplied is

  CA_sign_sig [k] = (-1) [k mod 2]

Here CA_sign_sig sign_sig [k] is the sign of + 1 / -1 to multiply the kth signature, and [k mod 2] is the remainder of k divided by 2. x is defined as a number representing the dimension of the signature used. That is, it can be expressed as follows.

x = 2 if 0 <NUM_CPCH <= 4

   4 if 4 <NUM_CPCH <= 8

   8 if 8 <NUM_CPCH <= 16

And the signature used is as follows.

+ 1CA_sig [k] = (16 / x) *

+ 1

란 y를 넘지 않는 최대의 정수를 뜻한다. 예를 들어, 4개의 시그너쳐를 사용하는 경우의 시그너쳐 할당을 보이다.here

Is the largest integer not exceeding y. For example, show signature assignment when using four signatures.

S1 => 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1

S5 => 1 1 1 1 1 -1 -1 -1 -1 1 1 1 1 1 -1 -1 -1 -1

S9 => 1 1 1 1 1 1 1 1 -1 -1 -1 -1 -1 -1 -1 -1

S13 => 1 1 1 1 1 -1 -1 -1 -1 -1 -1 -1 -1 1 1 1 1

As shown in the above, when the signatures are allocated according to the method of the present invention, the Hadamard code of length 4 is repeated four times. Therefore, since the repeated four symbols are added after receiving the CA-AICH at the mobile station receiver, the FHT having a length of 4 may be taken, thereby greatly reducing the complexity of the receiver.

In the CA-AICH signature mapping, the signature number for each CPCH information may be added by adding one by one. In this case, two consecutive 2i and 2i + 1th symbols become opposite signs, and the mobile station receiver can remove the back symbol from the previous symbol among the two despread symbols, and thus can be regarded as the same implementation.

On the contrary, the signature allocated to the CD-AICH can be allocated in the following order. The easiest way to generate the signature of the k-th CD-AICH is to increment the signature number by one in the CA-AICh signature assignment above. Another way is to write

 CD_sign_sig [k] = (-1) [k mod 2]

+ 2CD_sig [k] = 2 *

+ 2

That is, as described above, CA-AICH is sequentially allocated in the order of [2, 4, 6, 8, 10, 12, 14, 16].

Fig. 15 shows a CA-AICH receiving apparatus of a mobile station for the signature structure. Compared with FIG. 14, there is no position converter and mask generator. This is because the signature has been redesigned to avoid this conversion.

Referring to FIG. 15 again, the input of the A / D converter is despread by multiplying the spread code Wp of the pilot channel and inputted to the channel estimator to estimate the size and phase of the channel of the forward link. The input signal is multiplied by the Walsh spreading code of the AICH channel and accumulated for a predetermined symbol period (256 chips) to output a despread symbol. The despread symbols are input to the FHT converter 1529. The FHT converter 1529 receives demodulated symbols as inputs and outputs a signal size for each signature. The control and determination unit 1531 receives the output of the FHT converter 1529 and finds and determines the signature of the CA-AICH most likely to be input. Unlike FIG. 14, FIG. 15 does not multiply the position converter and the mask. This is because the signature has been redesigned so that the mobile station can perform the FHT even without this additional operation.

In the present invention, another embodiment of the CA-AICH signature structure is shown. In the second embodiment, the Hadamard function is used as a signature to simplify the structure of the mobile receiver. In addition, a more efficient allocation method is proposed when using a part of signature CA-AICH. This is summarized as follows. Generate 2K signatures 2K in length. (If you consider multiplying the sign by + 1 / -1, the number of possible signals can be 2K + 1.) However, if you use only some of the signatures instead of using all the signatures, It is necessary to allocate them more efficiently to reduce them. Suppose we use only M signatures out of all signatures. Where 2L-1 <M <= 2L and 1 <= L <= K. In this case, M signatures having a length of 2K are used to repeatedly transmit 2K-L times each bit of the HLadamard function having a length of 2L.

In addition, the assignment of the channel used for the reverse common control channel is also an important problem.

First, the easiest channel allocation method is a method in which a base station assigns a one-to-one correspondence between a forward control channel for transmitting power control information and a reverse common control channel for transmitting a message. When the forward control channel and the reverse common control channel are allocated one-to-one as described above, the reverse common control channel and the forward control channel can be allocated in one command without any additional message. That is, the channel allocation method as described above is a case where the CA-AICH designates both channels to be used for the forward and reverse links.

The second method is to map the reverse channel as a function of the signature of the AP preamble transmitted by the mobile station, the number of slots of the access channel, and the signature of the CD preamble. For example, the reverse common channel is associated with the signature of the CD preamble and the reverse channel corresponding to the slot number when the preamble is transmitted. That is, in the channel allocation method as described above, the CD-AICH functions to allocate a channel used for the reverse link, and the CA-AICH functions to allocate a channel used for the forward link. When the base station allocates the forward channel in the same manner as described above, the efficiency of channel utilization is increased because the base station can utilize the resources of the base station to the maximum.

7 is a diagram illustrating a structure of a mobile station communicating a message through a reverse common channel according to an embodiment of the present invention.

Referring to FIG. 7, the AICH demodulator 711 receives and demodulates the AICH signals of the forward link transmitted from the AICH generator of the base station under the control of the controller 720. The AICH demodulator 711 may include an AP-AICH demodulator, a CD-AICH demodulator, and a CA-AICH demodulator, respectively. In this case, the controller 720 designates a channel of each demodulator so as to receive AP-AICH, CD-AICH, and CA-AICH transmitted from the base station as shown in 311 of FIG. 3. In addition, the AP-AICH, CD-AICH and CA-AICH may be implemented in one demodulator or in separate demodulators. In this case, the controller 720 may designate a channel by allocating slots to receive each AICH received in time division.

The data and control signal processor 713 is assigned a channel by the controller 720, and receives and processes data or control signals (including power control commands) received through the designated channel. The channel estimator 715 estimates the strength of the signal transmitted from the base station and received on the forward link, controls phase compensation and gain of the data and control signal processor 713, and assists demodulation.

The controller 720 controls the overall operation of the forward link channel receiver and reverse link channel transmitters of the mobile station. In the embodiment of the present invention, the controller 720 controls the generation of the access preamble AP and the collision detection preamble CD when the base station is accessed, and processes the AICH signals transmitted from the base station. That is, the controller 720 controls the preamble generator 731 to generate the access preamble AP and the collision detection preamble CD as shown in 351 of FIG. 3, and processes the AICH signals generated as shown in 311 of FIG. 3 by controlling the AICH demodulator 711.

The preamble generator 731 generates and outputs a preamble AP and a CD as shown in 351 of FIG. 3 under the control of the controller 720. A frame formatter 733 inputs preamble APs and CDs output from the preamble generator 731, packet data and pilot signals of a reverse link, and formats the frame data into frame data. The frame formatter 733 outputs a power control signal output from the controller 720. By controlling the transmission power of the reverse link. In this embodiment, the channel for outputting the encoded packet data may be a reverse common packet channel. In addition, a power control command for controlling the power of the forward link may be transmitted on the reverse link.

8 is a diagram illustrating a structure of a base station for communicating a message through a reverse common channel according to an embodiment of the present invention.

Referring to FIG. 8, the preamble detector 811 detects a preamble AP and a CD transmitted from the mobile station and is received as shown in FIG. The data and control signal processor 813 is assigned a channel by the controller 820 and receives and processes data or control signals received through the designated channel. The channel estimator 815 controls the gain of the data and control signal processor 813 by estimating the strength of the signal transmitted from the base station and received on the forward link.

The controller 820 controls the overall operation of the forward link channel transmitter and reverse link channel transmitter of the base station. In an embodiment of the present invention, the controller 820 controls the detection of the access preamble AP and the collision detection preamble CD generated when the mobile station accesses the base station, and the AICH signals for the response and the channel assignment command for the preamble AP and the CD. Control the occurrence. That is, when the access preamble AP and the collision detection preamble CD received through the preamble detector 811 as shown in 351 of FIG. 3 are detected, the controller 820 controls the AICH generator 831 to generate AICH signals as shown in 311 of FIG. 3.

The AICH generator 831 generates AP-AICH, CD-AICH, and CA-AICH, which are response signals to the preamble signal, under the control of the controller 820. The AICH generator 831 may include an AP-AICH generator, a CD-AICH generator, and a CA-AICH generator, respectively. In this case, the controller 820 designates each generator to generate AP-AICH, CD-AICH, and CA-AICH, respectively, as shown in 311 of FIG. 3. In addition, the AP-AICH, CD-AICH and CA-AICH may be implemented as one generator or may be implemented as separate generators. In this case, the controller 820 may time slot the slots of the AICH frame and allocate slots of the AICH frame to transmit each AICH.

A frame formatter 833 inputs and formats the AP-AICH, CD-AICH and CA-AICH outputted from the AICH generator 831 and control signals of a forward link, and outputs the formatted signal. The power control command outputted from the controller 820 is output. By controlling the transmission power of the reverse link. In addition, if a power control command for the forward link is transmitted through the reverse link, the power of the forward channel for controlling the common packet channel may be controlled according to the power control command.

In the above-described embodiment of the present invention, only one CPCH can be allocated to one slot. That is, even if the signatures for assigning each channel of the CA-AICH are orthogonal to each other, the mobile station cannot know what is transmitted to itself. In order to solve this problem, a structure capable of transmitting multiple CPCHs in one slot may be used. This structure may be a case where the base station transmits the CD-AICH to the terminal of the CA-AICH to the CD-AICH.

In the embodiment of the present invention, a case in which CA-AICH allocates two CPCHs at one time to the CD-AICH will be described. When transmitting the CD-AICH, the base station can multiply and transmit one signal of + 1/0 / -1. Multiplying by 0 means that the base station does not detect the CD preamble of the terminal. When detecting, the base station can multiply one of + 1 / -1 and transmit.

The information + 1 / -1 multiplied by the CD-AICH can be used to designate the CA-AICH. In other words, when the CD-AICH is multiplied by +1 and transmitted, the base station multiplies and transmits the CA-AICH by +1 to the corresponding terminal. If the CD-AICH is multiplied by -1 and transmitted, the base station multiplies the CA-AICH by -1 and transmits the same to the corresponding terminal. Then, the terminal detects a multiplied pattern of + 1 / -1 by the CD-AICH and uses a channel corresponding to the pattern among channel allocation commands transmitted to the CA-AICH. That is, if the terminal detects a pattern of -1 in the CD-AICH, the channel is multiplied by -1 among the channel allocation commands transmitted to the CA-AICH, and the channel is transmitted. The channel to be transmitted is multiplied by +1 among the channel assignment commands. In this way, two channel assignments can be simultaneously performed in one AICH.

The above method has an advantage that up to two CPCHs can be allocated in one slot. However, the above object can also be implemented in other ways. 16 is a diagram illustrating a first implementation of allocating several CPCHs according to an embodiment of the present invention. In FIG. 16, only the CD-AICH and the CA-AICH are shown, and the processes of transmission of the acquisition preamble, acquisition AICH, CD preamble, etc., which are performed before them, are as shown in FIG. Τcd-ca of FIG. 16 indicates a time delay between the CD-AICH and the CA-AICh. The CD-AICH and the CA-AICH may be simultaneously transmitted by setting this value to zero.

As shown in FIG. 16, several orthogonal functions are allocated to the CD-AICH. Multiple orthogonal codes W1, W2, ....., WN are assigned to the CD-AICH. Then, the mobile stations are informed in advance how many simultaneous CD-AICHs can be transmitted. When the base station tries to transmit M (0 <M <= N) CD-AICH at once, the base station transmits the CD-AICH in M orthogonal codes among the N CD-AICH channels. For example, when a base station wants to allocate two CPCHs, it transmits different CD-AICHs in two orthogonal codes of W1 and W2. The orthogonal code for transmitting the CD-AICH and the orthogonal code for transmitting the CA-AICH are promised in advance. For example, when the CD-AICH is transmitted to W1, the CA-AICH is transmitted to WN + 1, and when the CD-AICH is transmitted to W2, the CA-AICH is transmitted to WN + 2. The mobile station demodulates all orthogonal codes W1, W2, ....., WN and checks whether the base station has transmitted the CD-AICH transmitted by itself. If it receives a signature of CD_AICH to be received, it can demodulate the orthogonal channel of CA-AICH promised to the orthogonal channel in advance and know the information of CPCH assigned to it. For example, when the mobile station receives the CD-AICH transmitted to itself at W2, the mobile station only needs to receive information on the CPCH channel transmitted on the channel of WN + 2 promised in advance in this orthogonal channel.

17 shows a second embodiment of allocating multiple CPCHs according to an embodiment of the present invention. 17, one orthogonal channel can be allocated to a CD / CA-AICH. In this case, the signature may be well distributed, so that one signature may be allocated to the CD-AICH and another CA-AICH may be allocated to another channel. Therefore, the embodiment shown in FIG. 17 is a case where the CD-AICH and the CA-AICH are simultaneously transmitted in one orthogonal channel. Multiple orthogonal channels are assigned to this AICH. A plurality of CD / CA-AICHs are transmitted on each orthogonal channel. That is, a signal is allocated to assigning multiple CPCHs to one slot. The mobile station receives the AICH transmitted on several orthogonal channels and checks whether there is a CD-AICH transmitted to it. If there is no CD-AICH sent to it, it recognizes that the host country has not assigned a CPCH and retries next time. However, if the CPCH is transmitted on one orthogonal channel, the CPCH is transmitted by receiving the CA-AICH transmitted on the channel.

In this way, multiple CPCH assignments can be allowed in one slot. The base station informs the broadcasting channel of information on how many CPCHs can be allocated to one slot. In addition, orthogonal codes used for each CD-AICH and CA-AICH may be informed. The mobile station receives the information related to CPCH allocation of the broadcasting channel and demodulates all possible CD-AICHs. When the mobile station receives the CD-AICH signature (signature of AICH corresponding to the CD preamble transmitted by itself) transmitted to the mobile station, the mobile station transmits the CA-AICH transmitted by the orthogonal code corresponding to the received CD-AICH (or the same). Demodulate to obtain the CPCH related information assigned to the mobile station.

As mentioned above, in order to allocate several CPCHs in one slot, the base station must transmit several AICHs, but the mobile station has a burden of receiving signals from several channels. That is, a separate receiver may be provided for each channel to separately demodulate and detect a signal from each AICH. However, the receiver greatly increases the complexity of the mobile station. However, by efficiently designing orthogonal codes assigned to several AICHs, the AICH can be detected without significantly increasing the complexity of the mobile station receiver. For example, suppose that the symbol length of one AICH is 256 chips. In the case of assigning two AICH channels, an orthogonal code Wi having a length of 128 chips is allocated to the AICH. In each AICH, two orthogonal codes [Wi Wi] and [Wi -Wi] having a length of 256 chips are allocated. The mobile station receiver can despread this 128-chip orthogonal code Wi and add and subtract the despreading result in two symbol units to generate the received symbols of each AICH. When four AICH channels are allocated, an orthogonal code Wk of length 64 chips is allocated to the AICH. At this time, four orthogonal channels are allocated to the AICH: [Wk Wk Wk Wk], [Wk -Wk Wk -Wk], [Wk Wk -Wk -Wk], and [Wk -Wk -Wk Wk]. At this time, the mobile station receiver despreads and receives the input signal with the orthogonal code Wk having a length of 64 chips. If four consecutive despread symbols are x1, x2, x3, and x4, respectively, the output of each channel can be made as follows.

Y1 = x1 + x2 + x3 + X4

Y2 = x1-x2 + x3-X4

Y3 = x1 + x2-x3-X4

Y4 = x1-x2-x3 + X4

Here, Y1, Y2, Y3, and Y4 denote despread symbols corresponding to four AICHs, respectively.

In addition, the + 1 / -1 information of the CD-AICH may be used for channel allocation. 9 shows an example of using the channel assignment with + 1 / -1 information transmitted on the CD-AICH. In the embodiment of FIG. 9, it is assumed that all 8 CPCHs are available at the same time, and an example of allocating channels to + 1 / -1 transmitted on the CD-AICH may be applied regardless of the above-described specific values.

Referring to FIG. 9, eight forward control channels are grouped into four groups, and classified into groups A and B as shown in 911 and 913. If the CD-AICH is transmitted by multiplying by +1, the forward control channel is selected from four channels of the A group such as 911. If the CD-AICH is transmitted by multiplying by -1, the forward control channel is equal to 913. One of four channels in group B is selected. If the channel is allocated in the same manner as in FIG. 9, the length of the CA-AICH capable of transmitting the channel assignment command with the signatures orthogonal to each other is reduced in half. In this case, the channel number of the CPCH corresponds to the forward channel in a 1: 1 manner so that the forward CPCH can be designated only by specifying the forward channel, and can be designated as a function of an AP, a CD preamble, and an access slot number transmitted by the terminal. It may be. In addition, in the embodiment of FIG. 9, the number of CPCHs is limited to eight, and the reason why the CA-AICH is a 4-bit symbol length is that the CA-AICH as shown in FIG. 6 is used as a time division with the CD-AICH. Its purpose is to.

The code of the CD-AICH can also be used for other purposes. The code of + 1 / -1 of the CD-AICH is used to indicate whether to transmit the CA-AICH. That is, the forward channel and the reverse common packet channel are mapped as a function at the time of transmission of the AP preamble, CD preamble, and each preamble transmitted by the mobile station. As a function of the preamble transmitted by the mobile station and the time of transmission, a reverse common packet channel and a forward channel for controlling it are promised in advance, and the base station can know the pre-appointed channel from information such as the preamble and the transmission time transmitted by the mobile station. have. The base station can detect the preamble of the mobile station to know the pre-scheduled reverse common packet channel and forward channel, and can know whether the channel is already in use by another user. If a pre- promised reverse common packet channel or a forward channel is in use by another user, transmit a channel assignment command (CA-AICH); otherwise, send a pre-assigned reverse common packet without transmitting a channel assignment command (CA-AICH). Use packet channel or forward channel. That is, if a previously promised reverse common channel / forward channel is available, the CD-AICH is multiplied by a sign of +1, and the channel assignment -AICH is not transmitted. If the promised reverse common channel / forward channel is already in use by another user, the CD-AICH is multiplied by a sign of -1 and the channel assignment-AICH is transmitted. In this case, the reverse common packet channel is transmitted through the channel allocated by the channel assignment AICH. In this way, the channel is reserved for the preamble transmitted by the mobile station in advance, and the channel assignment-AICH is transmitted only when the promised channel is in use by another user, thereby reducing the probability of transmitting the channel assignment-AICH.

When the mobile station receives the CD-AICH and detects that the code multiplied by the CD-AICH is +1, the mobile station uses the preambles transmitted by the terminal and a channel previously reserved as a function at the time of transmission. However, if the code multiplied by the CD-AICH is detected as -1, the pre-scheduled channel is in use by another user, and therefore waits for the CA-AICH transmitted by the base station. And it receives the CA-AICH and transmits data using the forward / reverse common packet channel allocated by the base station.

In the embodiment of the present invention, a case of allocating a new forward link channel for CA-AICH or time-dividing with CD-AICH in transmitting CA-AICH has been described. However, the CA-AICH may be transmitted to the location of the existing CD-AICH. That is, the CA-AICH is transmitted to the slot following the CD-AICH. The advantage that can be obtained by doing so is that there is no need to transmit a CA-AICH by assigning a separate channel to the forward link. However, in this transmission, there may be a problem in which a mobile station transmitting an access preamble to another access slot misidentifies the CA-AICH with the CD-AICH. To solve this problem, it is possible to:

In the case of a CD-AICH transmission, the signature is multiplied by +1. In the case of a CA-AICH transmission, the signature is multiplied by -1. The mobile station receives the signature and detects the sign to determine whether the transmitted AICH is a CD-AICH or a CA-AICH. In this case, unless the same CA-AICH and CD-AICH are transmitted, the CD-AICH and CA-AICH can be simultaneously transmitted.

Alternatively, if it is determined that the CD-AICH will be transmitted, the base station does not transmit the AICH for the AP preamble or the CD preamble of the next access slot. In this case, since only the mobile station receiving the AICH will receive the CD-AICH, the mobile station will not mistake the two cases. However, if the CD-AICH is frequently transmitted, the base station may not transmit the AICH frequently. Therefore, it is preferable to reduce the number of CD-AICH transmissions. In this case, a method of transmitting a CD-AICH may be adopted only when a channel is reserved for a transmission time of a preamble and a mobile station as described above, and the channel is used by another user. That is, as described above, it informs the mobile station whether the CA-AICH is transmitted as a code of the CD-AICH. By doing so, there is an advantage in that channel allocation can be performed without allocating a separate channel to the CD-AICH.

In the present invention, by transmitting the CA-AICH after the CD-AICH is transmitted or by simultaneously transmitting the CA-AICH with the CD-AICH, a collision probability of a reverse common packet channel is reduced and channel allocation is efficiently performed. Can provide. However, the above embodiment illustrates a case where the CD-AICH and the CA-AICH are transmitted separately.

FIG. 10 illustrates an embodiment in which a CD-AICH and a CA-AICH are combined and transmitted in one AICH. That is, FIG. 10 shows an example in which the base station combines the information of the CD-AICH and the CA-AICH and transmits one signature to the forward AICH when detecting the CD preamble transmitted from the mobile station. In FIG. 10, when the base station detects the CD preamble, the AICH transmitted from the mobile station is called CD / CA-AICH. FIG. 10 illustrates an operation of transmitting a CD / CA-AICH when the base station detects a CD preamble as described above. Here, the CD-AICH and the CA-AICH are combined and transmitted in one signature.

The signature of the CD / CA-AICH shown in FIG. 10 may be generated in a CD / CA-AICH generator having a structure as shown in FIG. 11.

Referring to FIG. 11, the base station combines the detected signature of the CD preamble and the information of the CA to generate one signature. In the embodiment of the present invention, it is assumed that there are 16 CD signatures and 16 CPCHs are possible. There are 256 possible combinations of this information, which can be thought of as 8 bits of information. The 8-bit information is input to the signature encoder 1111 to generate a signature having a length of 16 symbols. The CD / CA signature corresponding to each slot generated by the encoder 111 is input to the multiplexer 1113 and multiplexed, and the output of the multiplexer 1113 is spread by the orthogonal code Wcd / ca assigned to the CD / CA-AICH in the multiplier 1115. The orthogonal spread signal is spread by the multiplier 1117 and then spread by the spreading code of the forward link and transmitted to the forward link.

One slot of the AICH is 20 symbol intervals. In practice, however, signatures are only sent to 16 symbols. In the example of FIG. 11, it is assumed that the CD / CA signature is transmitted for 16 symbols. However, in order to maximize the gain of the encoding, the signature may be extended to a length of 20 symbols to use the (20, 8) encoder.

At this time, the terminal receives the channel of the CD / CA-AICH and performs a test for the signature corresponding to the CD preamble transmitted by the terminal. In this case, the number of signatures that the base station can transmit is 256, but since the terminal already knows the CD value expected, it is not necessary to perform detection of all signatures. That is, the mobile station needs to detect only 16 channel assignments corresponding to the CD preamble transmitted by the mobile station. When the terminal detects the CD and the channel allocation command detected by the terminal, the terminal transmits the reverse common packet channel using the designated channel after a predetermined time.

6A and 6B illustrate an embodiment of transmitting CA-AICH. FIG. 6A illustrates a case of newly allocating a channel for CA-AICH, and FIG. 6B illustrates a case of transmitting CA-AICH by time-division with an existing AICH. 12A and 12B illustrate an embodiment of a structure for efficiently transmitting a CD-AICH and a CA-AICH.

In the case of FIG. 6 (a), after receiving the CD-AICH, the receiver of the mobile station needs to change the orthogonal code of the receiver to receive the CA-AICH. Therefore, in the embodiment of FIG. 12 (a), one orthogonal code channel is allocated to transmit CD-AICH and CA-AICH, and another AICH is allocated to even-numbered access slots and odd-numbered access slots. The case of transmitting the CD-AICH and CA_AICH is shown. That is, the base station allocates two channels to transmit the CD-AICH and CA-AICH, wherein the first CD / CA-AICH channel transmits the CD-AICH and CA-AICH for the odd numbered access slot, The second CD / CA-AICH channel transmits CD-AICH and CA_AICH for even-numbered access slots. The mobile station receives the CD-AUCH and CA-AICH in the first CD / CA-AICH if the access preamble is transmitted to the odd-numbered access slot, and the CD-AUCH in the second CD / CA-AICH if it transmits to the even-numbered access slot. And CA-AICH. In the embodiment of FIG. 12A, the CD-AICH and the CA-AICH transmitted to one mobile station are transmitted in succession, but may be transmitted with a time interval of several symbols.

FIG. 12B illustrates an embodiment in which the CD-AICH and CA-AICH of FIG. 12A are combined and transmitted in one single CD / CA-AICH signature. The base station allocates two channels for transmitting the CD / CA-AICH, wherein the first CD / CA-AICH channel transmits the CD / CA-AICH for an odd numbered access slot, and the second CD / CA. -AICH channel transmits CD / CA_AICH for even-numbered access slots.

The above-described method provides a method in which a base station allocates resources related to a common packet channel, that is, a forward control channel and a common packet channel in a batch. Look at another implementation method for performing channel assignment as described above. In another implementation method, the terminal transmits the access preamble AP and the base station transmits the AP-AICH in the same manner, but allocates the CD preamble that can be transmitted by the terminal to two channels. That is, two forward control channels can be allocated to each CD preamble. In this case, the reverse common packet channel may correspond 1: 1 with the forward control channel.

In the implementation method, when the terminal transmits the CD preamble, it can be known in advance that the terminal uses one of two channels allocated to the CD preamble. Similarly, when the base station detects a CD preamble, it can know which channel the terminal will use. That is, the terminal may use one of two channels corresponding to the CD preamble.

In this case, the base station may determine which of the channels corresponding to the CD preamble transmitted by the terminal is available, and may allocate channel with + 1 / -1 to the CD-AICH. At this time, +1 means the first channel of the two channels, and -1 means the second channel of the two channels. If both channels corresponding to the CD are available, the base station selects and transmits any one of + 1 / -1. However, if only one of the two channels is available, the base station multiplies the CD-AICH by + 1 / -1 information corresponding to the available channel. And, if both channels are unavailable, the base station multiplies the CD-AICH by 0 and transmits it. This indicates that the base station transmits no signal.

Then, the terminal detects the CD-AICH and transmits a common packet channel to a channel corresponding to + 1 / -1. In this case, if the terminal does not detect the CD-AICH, the base station determines that the CD has not detected or there is no available channel and starts transmission again after a predetermined time delay.

In the present invention, it is proposed that the base station transmits a channel allocation command in the form of a signature for the preamble transmitted by the mobile station. The channel assignment command is a command transmitted by the base station to designate a channel of the forward link and a common packet channel of the reverse link. However, the data rate of the common packet channel can also be transmitted to this channel assignment command.

The mobile station and the base station set the data rate of the common packet channel in each preamble. That is, the mobile station transmits different preambles according to the data rate. In this case, although the base station has resources such as a forward channel and a reverse channel, the base station may not be able to service a data rate corresponding to the preamble transmitted by the mobile station. Alternatively, the mobile station may support a service of a data rate higher than the data rate corresponding to the preamble transmitted by the mobile station. In this case, the base station may transmit information on the data rate together with the channel assignment command. In other words, the channel allocation signature transmitted by the base station is one signature determined by a combination of channel allocation information and the data rate of the reverse common packet channel.

An object of the present invention is to improve the performance of packet communication through a reverse common channel by efficiently designing a forward notification device. Most of the methods described above were to make full use of existing acquisition notification channels to respond to channel allocation and collision detection of common packet channels. Another implementation of the CD / CA-AICH of the present invention is to send a combination of two in one code, without separately sending the CD-AICH and CA-AICH as shown in Figure 12 (a). In this way, more coding gain can be obtained.

FIG. 18 shows an embodiment in which a CD-AICH and a CA-AICH are combined and transmitted as one AICH as shown in 12 (a). That is, one code is extended by extending Reed Muller code of length 16. Referring to FIG. 12A again, if there are 16 cd signatures and 16 cpch in total, the number of information to be transmitted through cd / ca-aich becomes 8 bits. In this case, an encoder that outputs 16 bits (or 20 bits) may be encoded using 8 bits of information as an input. In the structure in which the CD-AICH and CA-AICH are transmitted separately, the higher coding gain can be obtained by combining the nine codes.

Referring to the structure of FIG. 18, up to 5 bits are the same as the existing orthogonal code. If the information transmitted on the CD / Ca-aich is less than 5 bits (for example, if the CD signature is 8 in the number of 8 CPCHs), each transmitted data satisfies the orthogonal relationship between the CD / CA-AICH. . If more information is transmitted through the CD / CA-AICH, the code is extended using a mask for this code. If a0, ..., and a4 are five bits of information, they are multiplied by the symbols 1, C16, 2, C16, 3, C16, 5, C16 and 9, respectively. Where Cn, m is the mth orthogonal code in orthogonal code (or Hadarmad code) of length n. Then, the information of a5, a6, and a7 is multiplied by the first mask, the second mask, and the third mask, respectively. The product of each orthogonal code or masks and the information to be transmitted is added together. All operations here mean operations in GF (2).

As a mask used in FIG. 18, a subset of the Bent function may be used. By using the Bent function, it is possible to maximize the distance of the codes finally output. In one embodiment of the present invention, the following mask may be used.

Mask 1: 0010 1000 0110 0011

Mask 2: 0110 1101 1100 0111

Mask 3: 0001 1100 0011 0111

In addition, different mask patterns can be selected to achieve the same performance. However, these basically perform the same.

Even when using the above codes, there is a method of further reducing the complexity of the mobile station. That is, the complexity of the mobile station can be reduced by locating the bits efficiently. Various arrangements are possible, but first, bits are allocated so that orthogonal relations between channel allocation instructions for the same CD signature are maintained. In other words, if the channel allocation command is P bit and the bit to distinguish cd is q bit, the allocation is performed as follows. Map a0, ....., aP-1 to the channel assignment command, and map aP, ....., aP + Q-1 to the CD signature information. This maintains an orthogonal relationship between channel assignment commands and can benefit by reducing non-orthogonal components as much as possible.

The operation of the mobile station in this regard is simple. The mobile station does not need to demodulate all possible codewords since it knows the cd signatures it has sent. Therefore, we only need to demodulate the channel assignments for the cd signatures we sent.

Another embodiment of the present invention relates to a method of dividing a reverse common channel into a plurality of groups and making dynamic resource allocation supported based on the same. As a criterion for dividing the reverse common channel into a plurality of groups, various methods such as a class of a terminal and a data rate of transmitted data may be used. For example, a mobile station having the same class may use a specific reverse common channel group or use a specific reverse common channel group according to a transmission rate of data to be transmitted by the mobile station. In this example, the mobile station selects a reverse common channel group according to a data rate transmitted through the reverse common channel. In order to be transmitted at a plurality of data rates, the signature of the access preamble is grouped into several groups according to the data rates. This grouping of data rates can be achieved by dividing the access preamble used by the mobile station to transmit the reverse common channel into several groups. The following example shows a case where eight access preamble signatures are assigned to four at 64 [kbps], two at 128 [Kbps], and two at 256 [Kbps]. At this time, the number of systems allocated to each transmission rate is arbitrarily changed according to the configuration of the system. Information about this is then known to mobile stations that intend to use the base station via a broadcasting channel.

* Available signature when transfer rate is 64 [Kbps] = {SIG1, SIG2, SIG3, SIG4}

* Available signature when the baud rate is 128 [Kbps] = {SIG5, SIG6}

* Available signature when the baud rate is 256 [Kbps] = {SIG7, SIG8}

If the mobile station attempts to transmit at 64 [Kbps] through the reverse common channel under the above conditions, the mobile station randomly selects the preamble signature among the allowed signatures SIG1, SIG2, SIG3, and SIG4 to transmit the access preamble to the base station. . The base station receiving the access preamble as described above may determine whether to accept the access to the reverse common channel based on the following conditions.

In this case, there may be a correspondence between the access preamble transmitted by the mobile station and the reverse packet channel used by the mobile station to transmit data after receiving the ACK of the base station. In the conventional method, a reverse packet channel is grouped and used in a 1: 1 correspondence with a preamble. However, this correspondence has the disadvantage that the number of usable preambles decreases as the number of reverse packet channels being used increases. Therefore, the present invention proposes a scheme in which the preamble is divided according to each transmission rate, the class of the terminal, etc., but not the reverse packet channel to be used. That is, one reverse packet channel can be allocated to any data rate or any class.

Signal flow to be proposed in the present invention is as shown in FIG. The only difference is that it does not correspond to the preamble used for the reverse common channel and can be assigned to any data rate and any class. The mobile station transmits one of the preambles corresponding to the data rate and (or class) it wishes to transmit. The base station receives this and sends an ACK or NAK for the access preamble of the mobile station. The criteria for this will be explained next. The mobile station that receives the AP-AICH transmits a CD preamble. The base station receiving the CD preamble transmits the CD-AICH and the CA-AICH in response to the CD preamble, and the CA-AICH includes information on the reverse channel to be used by the mobile station. However, the difference from the conventional method is that the reverse packet channel can be allocated to all data rates without restriction. That is, it is an advantage of the present invention that any reverse packet channel can be allocated as long as resources of the system allow it, regardless of data rate and class. At this time, whether the base station transmits an ACK or NAK for the access preamble of the mobile station can be determined based on the following criteria.

First, the base station determines according to the state of the code resources that can be allocated to the reverse common channel. For example, if 16 code channels can be allocated to the reverse common channel, if the number of code channels currently being used is 16 or less, access is allowed and an ACK signal is transmitted through the AP-AICH, and if the number of currently used code channels is 16, If not, the NAK signal is transmitted through the AP-AICH.

Second, the base station determines according to the radio resources that can be allocated to the reverse common channel, for example, the strength of the signal received by the base station through the reverse common channel and the total amount of interference. This is because the amount of radio resources being used may vary depending on the transmission rate even when multiple transmission rates are allowed, even when the same number of code channels are used by mobile stations. If there is an available radio resource, the base station allows access and transmits an ACK signal through the AP-AICH. If there is no available radio resource, the base station disallows access and transmits a NAK signal through the AP-AICH. In this case, the base station refers to the data rate (or capacity) allocated to the reverse common channel (or reverse common packet channel) as an example of determining whether to allocate the reverse common channel. In other words, if the mobile station attempts to access the data rate that the mobile station attempts to access, it checks whether the data rate (or reverse capacity) allocated to the reverse common packet channel is exceeded. If the data rate is allowed but the capacity of the reverse link is not exceeded, the base station transmits an ACK for the corresponding access. If the capacity of the accessed channel exceeds the capacity of the reverse link, the base station transmits a NAK. The advantage of doing this is that a common packet channel can be assigned at any data rate and class. In this way, the allocation of the reverse common packet channel is not limited by the number of common packet channels allocated to a specific data rate, but by the capacity of the reverse link allocated for the common packet channel and the total number of common packet channels. .

Third, it is also possible to mix the above two cases to allow access only when both code resources and radio resources are available.

Note that in the above method, the division of the scheme of the access preamble does not mean the division of the code channel used for the reverse common channel. In the example of splitting the access preamble signature, if 16 code channels exist for the reverse common channel, the base station can flexibly allocate all code channels to all data rates without restriction. That is, in the conventional method, the channel of an arbitrary CPCH can be assigned only to a specific data rate, but the advantage of using the allocation method of the present invention is that the CPCH channel can be assigned only to a specific data rate.

According to another embodiment of the present invention, the reverse common channel includes a plurality of reverse common channel groups, and the base station to which the dynamic allocation of radio resources including code resources for the reverse common channel group is performed is performed by the reverse common channel. A method of informing the status of a military to multiple mobile stations.

The base station uses the signature of all AP-AICHs allocated to the reverse common channel group to the AP-AICH when the resources allocated to the specific reverse common channel group are all used by other mobile stations. Transmit and notify the mobile stations of this fact. The NAK frame for this purpose may be transmitted at regular intervals (e.g. every 10 [ms]) or in the middle of responses to normal access preamble transmission while no channel is available. When the available resources are regenerated, the base station stops transmitting the NAK frame for the above purpose. If there is transmission of the access preamble from the mobile station and resource allocation is performed in response to this, as a result of the resource allocation for the received preamble, all the resources for the reverse common channel of the base station are exhausted. After transmitting an ACK frame indicating acceptance, a NAK frame indicating that resources for supporting a reverse common channel are exhausted is transmitted through the AP-AICH. The interval between the ACK frame and the NAK frame may be variable.

That is, the method of transmitting the state of the channel proposed by the present invention is the same as using OOK (On-off Keying). That is, when all resources of the corresponding group are unavailable, the NAK is transmitted to the AP-AICH to indicate that the reverse common channel is in use (On-Keying). If no resource of the corresponding group is available, no signal is transmitted. (Off-keying). In most systems, the system's resources are available more often than not, so energy efficiency can be achieved by the transmission of on-off keing in this manner.

In the present invention, a method of transmitting the state of a channel is proposed to be transmitted using OOK. In a specific implementation, the NAK is periodically transmitted to the AP-AICH. However, whether or not the channel can be used as a OOK can be transmitted to a location other than the AP-AICH. For example, a signal can be transmitted in an empty symbol between a slot and a slot of an AP-AICH. Even in this case, OOK can be used for energy-efficient transmission. If the unavailable probability of the channel is higher than the available probability, on-keyng may be off-keyed when available and transmitted.

The mobile station finds out the state of the reverse common channel group in the following manner. The mobile station starts from a certain point of time, for example, when power is applied or when it starts to use the reverse common channel, and all signatures of the AP-AICH assigned to the corresponding reverse common channel group to grasp the occupancy state of the reverse common channel. Check to see if a NAK frame is being sent. If NAK frames with such a condition are received continuously in a certain period, it is determined that the corresponding reverse common channel group is in use by another mobile station. If NAK frames are not received within a specified time, it is determined that an available reverse common channel is generated in the reverse common channel group. When data is transmitted to the mobile station through the reverse common channel, if it is determined that the current state of the reverse common channel group determined by the mobile station is occupied, the state check result is again examined after waiting for a random time. The mobile station repeats the above operation until there is an available reverse common channel. Various different meanings of the NAK may be transmitted to one AP-AICH. And, this may be transmitted in various other demodulation schemes. The NAK referred to in the present invention assumes that the base station has a meaning of disallowing access to the mobile station due to lack of system resources.

In the case where a plurality of reverse common channel groups exist, the same progress can be obtained by one-to-one correspondence between the signature of the access preem and the signature of the AP-AICH. For example, if the access preamble schemes SIG1 and SIG2 are assigned to the reverse common channel group 1, the schemes SIG1 and SIG2 of the AP-AICH are also assigned to the same reverse common channel group.

As described above, the NAK of the AP-AICH may be used to indicate whether a channel is available or unavailable. However, this may be used to indicate whether a group (data rate or grade) is available, but may also indicate availability of each channel.

First, consider the case of telling us whether each group is available. Each group is classified by data rate or class as described above, and each group is assigned the signature of one or more access preambles. At the same time, the signature of the AP-AICH corresponding to the access preamble is assigned to each group. As a method of notifying whether each group is used, there is a method of notifying that a common packet channel of a corresponding group is not available by transmitting a NAK even if one of the AP-AICHs assigned to each group is used. That is, the mobile station may determine that the group is unavailable if any one of the AP-AICHs assigned to the group receives the NAK. In addition, a specific signature may be specified in each group, and a NAK may be transmitted to a designated signature in the group, indicating that the group cannot be used. When the mobile station receives a NAK at a particular signature of a group, it knows that the group is not available.

However, there may occur a case in which ACK and NAK must be simultaneously transmitted to a signature of a specific AP-AICH. This is because the base station may change the unusable state after the base station needs to transmit an ACK for the access attempt for one group. In this case, the ACK may be transmitted by transmitting other signatures assigned to the group except for the signature that needs to send an ACK. It also sends a NAK to the next slot to see that the common packet channel of that group is not available.

If there is only one reverse common channel belonging to one group, or if the access preamble and the common packet channel correspond to 1: 1, the base station may inform the forward link whether the channel can be used. Similarly, NAK of AP-AICH can be used to indicate whether each channel is used. And, as described above, the base station and the mobile station can inform this information at an interval promised. In the designated period, the base station transmits a NAK when the channel is unavailable, indicating that the channel is unavailable. If a signature is sent to this slot with a signature, the mobile determines that the common packet channel corresponding to that signature is unavailable. If the slot needs to allocate the corresponding common packet channel, the common channel is allowed by transmitting a signature corresponding to the AP-AICH. If there is only one common packet channel corresponding to the preamble, this means that the channel has been allocated and after that the channel is in use. If other mobile stations receive an ACK in this slot, then the common channel will be available. It can be judged as none.

The present invention relates to a method in which a base station informs a forward link of channel availability status information. In the above description, the present invention assumes a common packet channel. However, such information may be commonly used for a random access channel as described with reference to FIG. 1. In the random access channel, the access preamble, the AP-AICH, and the random access channel used later may be 1: 1 corresponded. The base station and the mobile station may inform this information at an unknown appointment. In the designated period, the base station transmits a NAK when the channel is unavailable, indicating that the channel is unavailable. If a signature is sent to this slot with a signature, the mobile determines that the common packet channel corresponding to that signature is unavailable. If the slot needs to allocate the corresponding common packet channel, the common channel is allowed by transmitting a signature corresponding to the AP-AICH. If there is only one common packet channel corresponding to the preamble, this means that the channel has been allocated and after that the channel is in use. Therefore, if other mobile stations receive an ACK in this slot, the common channel cannot be determined to be available. Can be.

In the present invention, a method of informing whether each channel or group is available by transmitting a NAK to the AP-AICH is proposed. And this information can be transmitted periodically. However, if the availability of all channels or all groups is simultaneously transmitted in one slot, various NAKs may be transmitted simultaneously on the forward link. Therefore, in the present invention, it is proposed to transmit channel status information by time division by channel or by group. For example, if there are 8 channels in total, the time slots are divided by 4 channels so that the {1,2,3,4} channel information is used in the first slot and the {5, 6, 7, 8} status information is used in the second slot. Can be transmitted. The above-described structure for transmitting the state information for each channel by time division can also be applied to grouping common packet channels to transmit channel state information such as availability of a group. For example, if there are 7 groups in total, the time slots are divided by 4 channels so that the {1,2,3,4} group information is transmitted in the first slot and the {5, 6, 7} group information is transmitted in the second slot. Can be.

As described above, the existing common packet channel is designed on the premise that the terminal selects an arbitrary signature and uses the corresponding common packet channel. However, this method cannot efficiently manage resources related to the common packet channel. Accordingly, an embodiment of the present invention provides a method for a base station to collectively manage and allocate resources related to a common packet channel. Therefore, by using the channel assignment structure according to the embodiment of the present invention, resources related to the common packet channel can be used more efficiently.

Claims (5)

Assigning at least two orthogonal codes to a CD-AICH in one slot, Transmitting different CD-AICHs to the at least two first orthogonal codes, respectively; And transmitting the CA-AICH to the second orthogonal codes previously promised corresponding to the first orthogonal codes. A common channel communication method of a mobile station in a code division multiple access communication system for allocating at least two orthogonal codes to one CD-AICH in one slot, Receiving and demodulating different CD-AICHs spread to at least two first orthogonal codes; In the code division multiple access communication system, when the CD-AICH corresponding to the demodulation process is detected, despreading and demodulating the CA-AICH spread with the second orthogonal code promised in advance corresponding to the first orthogonal code. Common channel communication method of a base station. Generating one CD / CA signature to transmit the CD-AICH and CA-AICH as one AICH signal; And spreading the generated CD / CA signature with an assigned orthogonal code, spreading with a forward spreading code, and transmitting the spread CD / CA signature. The method of claim 3, wherein the CD / CA signature generation process, Obtaining a number of information to be transmitted based on the number of CD signatures and the number of all common packet channels (CPCH); When the number of pieces of information to be transmitted exceeds a preset number, multiplying the information corresponding to the predetermined number by the orthogonal codes respectively; Multiplying a mask corresponding to each piece of information exceeding the predetermined number; And generating the CD / CA signature by adding the information multiplied by the orthogonal codes and the information multiplied by the respective masks to generate the CD / CA signature. A circuit for assigning at least two orthogonal codes to a CD-AICH in one slot, A circuit for transmitting different CD-AICHs to the at least two first orthogonal codes, respectively; And a circuit for transmitting a CA-AICH to second orthogonal codes previously promised corresponding to the first orthogonal codes.

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