KR100878800B1 - Method for transmitting a packet data in Communication System - Google Patents

Abstract

The present invention relates to a mobile communication system, and more particularly, to a method of transmitting packet data.

Such a packet data transmission method according to the present invention comprises the steps of: prioritizing and sorting Walsh codes for data transmission in a mobile communication system using a time division scheme and a code division scheme; Transmitting Walsh code information used in the data transmission from the sorted Walsh codes in corresponding control channels; And transmitting the data to the corresponding terminal using Walsh codes according to the Walsh code information.

CWSI

Description

Method for transmitting a packet data in a communication system

1 is a diagram illustrating an example of a TDM packet transmission used in the present invention.

2 is a diagram showing an example of a packet transmission of the CDM / TDM scheme used in the present invention.

3 is a diagram illustrating an example of a transmission chain configuration of an S-DPCCH according to the present invention.

4 is a diagram illustrating another example of a transmission chain configuration of an S-DPCCH according to the present invention.

5 is a view showing an example of a CWSI analysis method when using 5 bits of CWSI in accordance with the present invention.

6 is a view showing another example of a CWSI analysis method when using 5 bits of CWSI according to the present invention;

7 illustrates an example of control channels in time when CWSI is set to 0 bits in accordance with the present invention.

The present invention relates to a mobile communication system, and more particularly, to a method of transmitting packet data.

Conventional wireless communication systems for packet data transmission use a physical channel such as a packet data channel (PDCH) and a packet data control channel (PDCCH) for packet data transmission.

The PDCH is actually a channel for transmitting packet data to be transmitted to the corresponding terminal (or user, hereinafter referred to as terminal). Several users divide the PDCH in time division multiplexing (TDM). The PDCCH includes control information that enables the terminal to properly receive data transmitted through the PDCH without error. The PDCCH uses two types, a primary PDCCH (P-PDCCH) and a secondary PDCCH (S-PDCCH). Of these, S-PDCCH is essentially used, and P-PDCCH is optionally used.

When the base station transmits packet data in a TDM manner by ordering the data to be transmitted to each terminal, the packet data transmitted to each terminal always uses available resources (i.e., Walsh codes used) allocated to the PDCH channel. Use them all. As a result, even if only a part of the available resources is needed, the use of all of them may result in waste of resources.

In addition, in the packet data transmission scheme based on the TDM scheme, the base station notifies Walsh code usage information to all terminals managed by the base station periodically or aperiodically in a broadcast form. At this time, the base station uses all the power available to all terminals (including the terminal in the harshest environment) to receive this Walsh code usage information, which causes waste in terms of power.

Furthermore, if the Walsh code usage information changes frequently and needs to be notified frequently, the PDCH cannot be transmitted at the time of transmitting the Walsh code usage information, thereby reducing the overall transmission efficiency of the system.

In addition, the terminal does not receive the fact that the Walsh code space has been changed due to some reason, or the terminal does not know or know the current Walsh code space is a problem that does not properly receive the PDCH transmitted to it.

Accordingly, the present invention has been made in view of the above-mentioned problems of the prior art, and is to provide a method for transmitting packet data that prevents waste of transmission power.

In addition, the present invention is to provide a packet data transmission method for increasing the resource utilization efficiency.

The present invention also provides a packet data transmission method in a system in which time division and code division multiplexing are used.

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Hereinafter, a configuration and an operation according to an exemplary embodiment of the present invention will be described with reference to the accompanying drawings.
A data receiving method in a mobile communication system according to an aspect of the present invention is a method of receiving packet data in a terminal of a mobile communication system, the method comprising first Walsh code usage information through a first packet data control channel; Receiving first control information, receiving second control information including second Walsh code usage information via a second packet data control channel, and a Walsh code space indicated by the first Walsh code usage information. Receiving first packet data over a first packet data channel using a first portion of the image; and receiving a second portion on the Walsh code space indicated by the first Walsh code usage information and the second Walsh code usage information. And receiving second packet data over a second packet data channel.
A data transmission method in a mobile communication system according to another aspect of the present invention is a method for transmitting packet data in a mobile communication system, comprising: a first control including first Walsh code usage information through a first packet data control channel Transmitting information to at least one terminal, transmitting second control information including second Walsh code usage information to the at least one terminal through a second packet data control channel, and the first Walsh code Transmitting first packet data to the at least one terminal over a first packet data channel using a first portion on the Walsh code space indicated by usage information, and the first Walsh code usage information and a second Walsh Over a second packet data channel using a second portion of the Walsh code space indicated by code usage information. Wherein the second packet of data at least comprises the step of transmitting the one or more terminals.
Hereinafter, a configuration and an operation according to an exemplary embodiment of the present invention will be described with reference to the accompanying drawings.

In a method for receiving data in a mobile communication system according to an aspect of the present invention, a method of receiving packet data in a terminal of a mobile communication system, the method comprising: a first code allocation information through a first packet data control channel; Receiving control information, receiving second control information including second code assignment information over a second packet data control channel, and a first portion in code space indicated by the first code assignment information Receiving first packet data through a first packet data channel using a second packet data channel using a second portion of the code space indicated by the first code assignment information and the second code assignment information; And receiving the second packet data via.

A data transmission method in a mobile communication system according to another aspect of the present invention is a method for transmitting packet data in a mobile communication system, comprising: first control information including first code assignment information through a first packet data control channel Transmitting second control information including second code allocation information to the at least one terminal through a second packet data control channel, and transmitting the at least one terminal to the first code allocation information. Transmitting first packet data to the at least one terminal via a first packet data channel using a first portion on the code space indicated by the first code data channel; and indicated by the first code allocation information and the second code allocation information. The at least one second packet data over a second packet data channel using a second portion on the code space It is configured to include the step of transmitting to the terminal on.

Hereinafter, a configuration and an operation according to an exemplary embodiment of the present invention will be described with reference to the accompanying drawings.

Prior to describing the present invention, the parameters used in the present invention will be described.

Walsh codes are a generic term for codes that are orthogonal to each other used when transmitting physical channels.

Scheduling is to determine the order and transmission method of packet data that the base station should transmit to each terminal.

The Walsh code space is a collection of Walsh codes currently available when the base station transmits packet data. The components change over time.

Walsh_Max is the maximum number of Walsh codes that can be included in the Walsh code space, and the value changes over time.

Walsh (all) is a parameter indicating all Walsh codes in the Walsh code space.

The code priority usage ranking table is a table in which the ranking is given, or a role that acts as such, when assigning a usage ranking to all Walsh codes that may be elements of the Walsh code space. When selecting codes to form the Walsh code space among the code codes of the code priority table, the code having the highest priority code is selected in order from the lower code order. In addition, when the Walsh code in the Walsh code space is allocated to the PDCHs, the Walsh code space may be allocated in the order of the highest code to the lowest code, or conversely, the lowest code to the highest code. For example, if there are a total of 28 Walsh codes (Walsh_Max is 28) having the possibility of being an element of the Walsh code space in the code priority table, and each Walsh code has an identification number indicating itself, the table 1 writes the Walsh code's identification numbers from top to bottom in the order of highest priority.

32-bin Walsh codes 31 15 23 7 27 11 19 3 29 13 21 5 25 9 30 14 22 6 26 10 18 2 28 12 20 4 24 8

PDCH (i) means the i-th PDCH when it is possible to use two or more PDCHs. In this case, each PDCH uses Walsh codes in Walsh code space separately.

For example, if up to four PDCHs are available in a system, PDCH (0), PDCH (1), PDCH (2), PDCH (3) are possible, and PDCH scheduled to transmit packet data at some point in time They share the Walsh code space. However, if only one PDCH is scheduled, the PDCH uses Walsh (all). On the other hand, when PDCH (0) and PDCH (3) are used at the same time, these two PDCHs divide Walsh code space, and the Walsh codes they use are defined as Walsh (0) and Walsh (3), respectively.

PDCCH (i) is a generic name of a physical channel that contains control information transmitted by a base station to terminals in order to successfully receive PDCH (i) when more than one PDCH may exist.

Walsh (i) is a set of Walsh codes used by PDCH (i) at a specific transmission time. This element consists of elements in the Walsh code space. Although the Walsh code space does not change, the Walsh code belonging to Walsh (i) changes over time. That is, Walsh (i) of the previous time and Walsh (i) of the current time have different constituent elements and number of elements.

N _{max_PDCH} is the maximum number of PDCH or PDCCH that the system or sector can use.

N _{real_PDCH} is the number of PDCH or PDCCH that the system or sector is using at the same time or to use at the same time. This N _{real_PDCH} has a value less than or equal to N _{max_PDCH} .

As shown in FIG. 1, the TDM packet data is transmitted in a time division manner by determining the order of data to be transmitted to each terminal. Here, the base station always uses all Walsh code space for the PDCH.

In FIG. 1, the length of time of the transmission unit on the PDCH and the PDCCH is fixed or variable. In addition, the transmission unit time lengths of the PDCH and the PDCCH do not necessarily have to match. user k implies packet data or control information for user k (or terminal k). Transmission of the PDCH and PDCCH for the user k is determined according to a specific rule, the transmission time and the transmission length. Here, the time interval between transmission of PDCH and PDCCH for each user may or may not exist depending on the system environment.

In the CDM / TDM packet data transmission, as shown in FIG. 2, the base station determines the order of data to be transmitted to each terminal (scheduling), and transmits the data in the time division (TDM) and code division (CDM) methods. In this manner, only one PDCH may be transmitted at a time of transmission, and several PDCHs may be transmitted.

When one PDCH is transmitted, Walsh (all) is used for this PDCH. When two or more PDCHs are transmitted, each PDCH uses Walsh codes in Walsh code spaces separately. That is, each PDCH (i) uses Walsh (i). PDCH (i) has PDCCH (i) which is a PDCCH having control information corresponding to each.

The terminal monitors the PDCCH (i), finds out what form of packet data is transmitted through which PDCH (i), and can receive the corresponding information. The transmission unit time lengths of the PDCH (i) and the PDCCH (i) do not necessarily need to match.

2 illustrates an example in which up to four PDCHs may exist in a CDM / TDM scheme. Here, the time lengths of the transmission units on the PDCH (i) and the PDCCH (i) are fixed or variable. There may or may not be a time interval between transmissions of PDCH or PDCCH for each user. In FIG. 2, the empty space is a case where PDCH or PDCCH is not used. In the transmission period (a), four PDCH (i) are transmitted, and four PDCCH (i) are used. In the transmission period (b), three PDCH (i) are transmitted, and three PDCCH (i) are used. In the transmission period (c), three PDCH (i) are transmitted, and three PDCCH (i) are used. In the transmission period (d), one PDCH (i) is transmitted and one PDCCH (i) is used. In the transmission period (e), four PDCH (i) are transmitted, and four PDCCH (i) are used.

As described above, the PDCCH uses two types, a primary PDCCH (P-PDCCH) and a secondary PDCCH (S-PDCCH). Of these, S-PDCCH is essentially used, and P-PDCCH is optionally used.

The present invention proposes a structure of a new control channel in order to use the CDM / TDM scheme as shown in FIG. 2, and names it S-PDCCH, and proposes an efficient operation method of the proposed control channel.

The control channel proposed in the present invention includes control information as shown in Table 2 below.

Information bit type of S-PDCCH (i) Number of information bits Encoder packet size 3 ARQ channel identifier 2 Subpacket identifier 2 Walsh Code Usage Information (CWSI) x_i MAC identifier 6 Total bits = (13 + x_i) bits

In Table 2, the MAC identifiers are binary information bits for identifying terminals. Values other than '000000' are information indicating to which terminal the information of the S-PDCCH being transmitted is transmitted.

The ARQ channel identifier and the sub packet identifier are binary information bits that inform the terminal whether to retransmit information on the PDCH corresponding to the S-PDCCH. Specifically, the ARQ channel identifier tells one terminal (assuming that it can transmit multiple retransmission channels) which retransmission channel among the retransmission channels, and in this retransmission channel the number of subpackets (encoded from one information stream) The symbol is repeated and divided into predetermined sub-packets).

The encoder packet size is a binary information bit indicating the number of data information bits transmitted on the PDCH.

The Walsh code use information (CDM Walsh Space Indication Identifier; CWSI) is a binary information bit indicating information on Walsh code used by PDCH (i) among Walsh code spaces or codes on a code priority usage list. In this case, the CWSI value is interpreted differently by the terminal according to the i value. That is, the meaning of CWSI of S-PDCCH (i) and S-PDCCH (j) (i ≠ j) may be different. And x_i may vary depending on the value of i. That is, the number of information bits of CWSI of S-PDCCH (i) and S-PDCCH (i ≠ j) may be different. In addition, the value of x_i may be 0, 1, 2, 3,... And may be fixed or variable for a particular i. If the x_i value of any S-PDCCH (i) is '0', it means that CWSI information is not transmitted on this S-PDCCH (i).

Hereinafter, CWSI on S-PDCCH (i) will be referred to as CWSI (i).

Next, examples of operating the present invention using the CWSI will be described. In this case, it is assumed that the present invention uses the priority use priority table of Table 1 as a case of using a mixed TDM and CDM scheme. In addition, the present invention presupposes the following points in common in the operation examples described below.

The base station informs terminals managed by the base station of N _{max_PDCH} using broadcast channels. In this case, N _{max_PDCH} is the maximum number of S-PDCCH (i) or PDCH (i) that the corresponding system or sector can use simultaneously, and may be a fixed value or a variable value. In this case, the base station may use N _{max_PDCH} S-PDCCH (1), S-PDCCH (2), and S-PDCCH (N _{max_PDCH} ) as a control channel.

In general, the S-PDCCH is transmitted using one specific Walsh code. At this time, the terminal needs to know which Walsh code is used to transmit the S-PDCCH. Therefore, the base station should inform the terminal of the Walsh code list used by the S-PDCCH.

In the present invention, since N _{max_PDCH} S-PDCCH (1), S-PDCCH (2), and S-PDCCH (N _{max_PDCH} ) exist, the corresponding system or sector is S-PDCCH (1) and S-PDCCH (2). The UEs must know what N _{max_PDCH} Walsh codes are used for transmission of the S-PDCCH (N _{max_PDCH} ). Therefore, the base station informs the terminals that manage the Walsh code list (WCL) through a broadcast channel. Here, WCL is a general _term for a list of Walsh codes used to transmit S-PDCCH (1), S-PDCCH (2), and S-PDCCH (N _{max_PDCH} ) or a means of giving the same information. Its content can be fixed or variable. Hereinafter, Walsh codes known through the WCL are referred to as wcl (1), wcl (2), and wcl (N _{max_PDCH} ) for convenience.

The S-PDCCH (1), S-PDCCH (2) _,, S-PDCCH (N _{max_PDCH} ) and wcl (1), wcl (2), and wcl (N _{max_PDCH} ) between the base station and the terminal are known in advance. There is a 1: 1 correspondence according to the rules.

Hereinafter, it is assumed that S-PDCCH (i) is transmitted using wcl (i). That is, S-PDCCH (i) has a 1: 1 correspondence with wcl (i).

According to the above method, the base station transmits packet data as follows.

The base station determines N _{real_PDCH} ( _≦ N _{max_PDCH} ) according to the scheduling result. In this case, when N _{real_PDCH} is 1, packet data is transmitted in a TDM scheme, and when N _{real_PDCH} is larger than 1, packet data is transmitted in a CDM scheme.

And to select the current N _{real_PDCH} of S-PDCCH (i) use from N _{max_PDCH} of S-PDCCH (i) according to the rule base station and the terminal are already-known. Hereinafter, it is assumed that S-PDCCH (1), S-PDCCH (2), and S-PDCCH (N _{real_PDCH} ) are always selected. According to the above assumption, wcl (1), wcl (2), and wcl (N _{real_PDCH} ) are used to transmit S-PDCCH (1), S-PDCCH (2), and S-PDCCH (N _{real_PDCH} ), respectively. do.

For example, if N _{real_PDCH} is 3, the base station _selects S-PDCCH (1), S-PDCCH (2), and S-PDCCH (3), and then selects wcl (1) and wcl (2) for each transmission. , use wcl (3). If the Walsh code used by the S-PDCCH (i) received by the terminal is found to be wcl (2), it can be seen that the received S-PDCCH (i) is S-PDCCH (2) and S-PDCCH (2). The information bits of the CWSI transmitted on < RTI ID = 0.0 >

Then, it determines which user's information is transmitted to which S-PDCCH (i) according to a rule known to the base station and terminals such as the transmission power rank of the S-PDCCH. For example, it determines which user's MAC identifier is set in the MAC identifier field of S-PDCCH (i). The base station transmits the PDCH (i) to the corresponding terminal according to the information of the S-PDCCH (i).

The terminal continuously receives the S-PDCCHs generated as described above until a certain condition (eg, a reception attempt until a S-PDCCH (N _{max_PDCH} ) is found) is satisfied. At this time, the order of attempting to receive the S-PDCCH (i) is preferably determined in consideration of the efficiency, if a certain condition is until the S-PDCCH (i) with its own MAC identifier is found, There may be an example.

For example, the terminals interpret the channels in the order of S-PDCCH (1), S-PDCCH (2), and S-PDCCH (N _{max_PDCH} ) until their MAC identifier is found. That is, in order to receive the S-PDCCH, an attempt is made using the Walsh code in the order of wcl (1), wcl (2), and wcl (N _{max_PDCH} ).

Or, the terminals interpret the channels in the order of S-PDCCH (N _{max_PDCH} ), S-PDCCH (N _{max_PDCH-} 1), and S-PDCCH (1) until their MAC identifier is found. That is, in order to receive the S-PDCCH, an attempt is made using the Walsh code in the order of wcl (N _{max_PDCH} ), wcl (N _{max_PDCH-} 1), and wcl (1).

Hereinafter, the terms PDCH and S-PDCCH are used to describe PDCH (i) and S-PDCCH (i) regardless of the value of i.

First example

This is a case where only the TDM scheme is used (ie, N _{max_PDCH} = 1) without using the CDM, and Walsh code space information is not informed to the terminals by broadcasting. Thus, it is assumed that the terminals do not know which codes on the code priority table constitute the Walsh code space.

Only one PDCH (i) and S-PDCCH (i) are used. Here, i is assumed to be 1, and it is assumed that PDCH 1 and S-PDCCH 1 are used. Accordingly, the CWSI 1 of the S-PDCCH 1 serves to inform Walsh code space information, and the PDCH 1 is transmitted to the corresponding terminal using walsh (all).

For example, if CWSI (1) is used to transmit PDCH (1) from the code of high priority on the code priority table to the code indicated by CWSI (1) value, {CWSI (1) = (01100) ₂ } is used to mean that the 12 Walsh codes are ordered from the top of the code priority table in order to form Walsh code space components.

Alternatively, the CWSI 1 does not necessarily mean the number of configuration codes belonging to the Walsh code space, but may also mean a specific combination of codes on the code priority table according to a specific rule.

For example, in Table 3 below, when Walsh_max is 28, Walsh code use unit is 3, and the number of bits of CWSI is 6 bits (when CWSI including combination information as described above, the number of bits required may be used. ), 11 points (P_0, P_1, ..., P_10) are designated in the code priority order table. In this case, a combination of the 11 points are present in a total of _{'11 C 2 = (11 *} 10) / 2 = 55' of. And, since the CWSI is 6, it can refer to a combination of a total of 2 ⁵ = 32. Therefore, the combination of 11 points and the value of CWSI are matched 1: 1, and the remaining values of '64 -55 = 9 'kinds of CWSI are used for specific other purposes.

The number of bits x_1 of the CWSI is used as necessary for the role. The transmission chain of the S-PDCCH when x_1 is 5 bits is shown in FIG. 3, and the transmission chain of the S-PDCCH when x_1 is 10 bits is shown in FIG.

In this way, when the system is operated, information on Walsh code space does not need to be transmitted to all terminals through a broadcast method.

3 is a diagram illustrating an example of a transmission chain configuration of an S-DPCCH according to the present invention.

4 is a diagram illustrating another example of a transmission chain configuration of an S-DPCCH according to the present invention.

3 to 4, the input sequence of the S-PDCCH includes a 6-bit MAC identifier, a 2-bit ARQ channel identifier, a 3-bit encoder packet size, and a 2-bit subpacket identifier as shown in Table 2. It includes. That is, 18 bits per N slot (when CWSI is 5 bits) or 23 bits per N slot (when CWSI is 10 bits). This N is either 1,2,4.

The input sequence is appended with an error detection code, such as a cyclic redundancy check (CRC) code, in the error detection code addition block 101,201. This added bit is then added with tail bits to send the final state of the encoder to a known termination in the tail bit addition block 102,202. The bits to which the tail bits are added are encoded into convolutional codes in the encoders 103 and 203. Here, when N is 1, the code rate is 1/2, and when N is 2 or 4, the code rate is 1/4.

The encoded bits are repeated in repetition factor 2 in symbol repetition blocks 104 and 204 when N is four. The number of these repeated bits is 68N (5 bits for CWSI) or 78N (10 bits for CWSI).

The repeated bits are punctured in the puncturing blocks 105 and 205 by the number of 20N (5 bits for CWSI) or 30N (10 bits for CWSI) bits.

The punctured bits are interleaved in the block interleavers 106 and 206 and modulated by the QPSK scheme in the modulators 107 and 207. This modulated signal is separated into an I channel and a Q channel using some of the Walsh codes indicated by the CWSI.

Second operation example

It is an operation method when N _{max_PDCH} is 2 and Walsh code space information is informed by a broadcasting method. Therefore, it is assumed that terminals know which codes on the code priority table constitute the Walsh code space.

Only two PDCH (i) and S-PDCCH (i) are used. In this case, i is assumed to be 1,2, and it is assumed that only PDCH (1), PDCH (2), S-PDCCH (1), and S-PDCCH (2) are used.

In this case, S-PDCCH 1 or S-PDCCH 2 is used to broadcast Walsh code space information to terminals in the following manner. In the following, the case of using the S-PDCCH (1) is taken as an example.

First, information bits on the S-PDCCH 1 are designated as follows. The MAC identifier is (000000) ₂ , the sub packet identifier is (11) _2, and 2 bits of the ARQ channel identifier and 3 bits of the encoder packet size are combined to form 5 bits of Walsh code space information (Walsh_Space_Indication_ID; hereinafter WSI). The x_1 bit of CWSI (1) is reserved for other purposes.

In the prior art, two bits of the ARQ channel identifier and three bits of the encoder packet size are combined to form a 5-bit WSI. That is, the number of codes corresponding to the WSI value is used from the code having the highest priority on the 'Code priority use table'.

While the MAC identifier is (000000) ₂ and the sub packet identifier is set to (11) ₂ , on the contrary, the information bits of the CWSI (1) are used as the WSI, and the information bits of the ARQ channel identifier and the information bits of the encoder packet size are used. It may be left for other purposes.

In this case, CWSI (1) is information about codes used to transmit PDCH (1) among codes in Walsh code space, and CWSI (2) is used to transmit PDCH (2) among codes in Walsh code space. Information about the codes used.

For example, the CWSI (1) uses the number of codes corresponding to the CWSI (1) value from the high priority code of the code priority table among the codes in the Walsh code space to transmit the PDCH (1). Use it to mean. The CWSI (2) is used for the transmission of the PDCH (2) as many times as the number of codes corresponding to the CWSI value from the lower priority code in the code priority use table among the codes belonging to the Walsh code space do. That is, the number of codes corresponding to the CWSI (2) value is used from the lowest order in the Walsh code space.

As in the above example, the CWSI values do not necessarily mean the number of codes, but may also mean a specific combination of codes belonging to the Walsh code space or 'code priority list' by some specific rule. The number of information bits x_i of the CWSI (i) is determined by the number necessary for the role.

If x_1 and x_2 are the same, the S-PDCCH 1 and the S-PDCCH 2 may use the same structure. For example, when x_1 = x_2 = 5, the S-PDCCH (i) structure of FIG. 3 may be used in the same manner.

Third operation example

N _{max_PDCH} is larger than 1, and it is an operation method when Walsh code space information is not informed by a broadcasting method. Therefore, it is assumed that the terminals do not know which codes on the code priority table constitute the Walsh code space.

Each N _{max_PDCH} PDCH (i) and S-PDCCH (i) are used. In this case, it is assumed that i is 1,2, 3, ..., N _{max_PDCH} .

The CWSI (i) is information on codes used to transmit the PDCH (i) among Walsh code spaces or codes on a code priority list, and x_i, which is the number of information bits of the CWSI (i), plays the role. Is determined by the number required. In this case, the CWSI (i) value may mean the number of codes, or may mean a specific combination of codes belonging to the Walsh code space or the 'code priority list' according to a specific rule.

3-1 Operation Example

The CWSI (i) is operated to be independently interpreted by the terminal itself. That is, if any terminal interprets only the CWSI (i) of the S-PDCCH (i) including its MAC identifier, it can obtain information on Walsh codes used by the PDCH (i) to which its packet data is transmitted. Can be.

The independent interpretation of the CWSI (i) of the terminal is divided into the following cases.

First, as an example when all the CWSI (i) values have the same meaning, there are the following usage methods.

When the Walsh code information is not transmitted to the broadcast channel, the plurality of control channels include information on Walsh codes located at the beginning and the end according to the sorted priority.

That is, CWSI (i) uses a code located between a specific code (Start_Walsh_Code; hereinafter SWC) on another code `` End_Walsh_Code '' hereinafter called EWC) to transmit PDCH (i). When transmitted, CWSI (i) consists of information indicating SWC and EWC. For example, assuming that the information bit of CWSl (i) is 10 bits (x_i = 10) and uses the code priority table of Table 1, the meaning of CWSl (i) = ( 00100 10100 ) ₂ is as follows. same. The SWC is a code having a position on the code priority priority table ₂ = 4, and the EWC is a code having a position on the code priority use table 1010 ₂ = 20. This means that the codes included between the 4th code and the 20th code on the code priority list are used to transmit the PDCH (i).

In this case, all S-PDCCH (i) may use the same structure. For example, when x_i = 10, all S-PDCCH (i) may use the structure of FIG. 4 in the same manner.

Second, only the meaning of a specific CWSI (i) value is used differently among a plurality of CWSI.

If the Walsh code information is not transmitted on the broadcast channel, one of the plurality of control channels includes the number of Walsh codes used for the data transmission channel according to the ordered priority, and the other control channels are the alignment. Include Walsh code information at the beginning and end according to the priorities.

The following is an example where only the meaning of CWSI (1) is used differently.

That is, the CWSI (1) is used to mean that the number of codes corresponding to the CWSI (1) value from the code of the first priority among the codes on the code priority table for the transmission of the PDCH 1 is used. . For example, assuming that the information bit of CWSl (1) is 5 bits (x_1 = 5) and uses the code priority table shown in Table 1, the meaning of CWSl (1) = (00100) ₂ = 4 to be. Here, CWSI (i) means that the codes included between the first code and the fourth code on the code priority order table are used to transmit the PDCH 1.

However, if i is greater than 1, the CWSI (i) has a code located between a specific code (or SWC) on another code (or EWC) in the code priority table for PDCH (i) transmission. When used, CWSI (i) consists of information indicating SWC and EWC.

For example, assuming that the information bit of CWSl (i) is 10 bits (x_i = 10) and uses the code priority table shown in Table 1, {CWSl (i) = ( 00101 10100 ) ₂ } In this case, the SWC is a code having a location on the code priority usage list of {(00101) ₂ = 5}, and the EWC is a code having a location on the code priority usage table of {(10100) ₂ = 20}. That is, in order to transmit the PDCH (i), it means that codes included between the 5th code and the 20th code on the code priority usage table are used.

In this case, all of the S-PDCCH (i) except the S-PDCCH (1) may use the same structure. That is, when x_1 = 5 and x_i = 10 (i> 1), the S-PDCCH 1 may use the structure of FIG. 3 and the remaining S-PDCCH (i) may use the structure of FIG. 4.

3-2 Operation Example

When the terminal interprets each CWSI (i) received through the control channels, the terminal does not interpret the CWSI (i) independently but operates to refer to other CWSI (j) (i ≠ j).

When the Walsh code information is not transmitted to the broadcast channel, the Walsh code usage information of any one of the plurality of channels is interpreted with reference to Walsh code information used for corresponding data transmission channels of other control channels. In addition, the transmission power of one of the Walsh code usage information is transmitted is larger than the transmission power of the other control channel to receive all of the plurality of control channels. In Table 1, among codes other than Walsh codes used in the other data transmission channel, it is interpreted that they are used according to priority as many as the number of codes according to the Walsh code usage information. At this time, the Walsh code information used for the other data transmission channel includes information on the first and the end position in the sorted Walsh codes through the control channel as shown in FIG. 5 or 6.

That is, a certain terminal may use PDCH (i) in which its packet data is transmitted using not only CWSI (i) of S-PDCCH (i) including its MAC identifier, but also information of other CWSI (j). To get information about the code that is being used.

In this case, CWSI (i) uses code priority among codes belonging to Walsh code space except for codes used by PDCH (1), PDCH (2), PDCH (3), and PDCH (i-1). It means that the number of codes corresponding to CWSI (i) value is used for the transmission of PDCH (i) from the code having the highest priority on the leaderboard '.

In particular, the meaning of CWSI (1) means that the number of codes corresponding to CWSI (1) values is used from the highest priority code on the 'Code Priority Table' for the transmission of PDCH (1) according to the above definition. Means.

In this case, the CWSI (i) value does not necessarily need to be the number of codes, and may refer to a specific code on the Walsh code space or 'code priority use table' according to a specific rule.

In this case, the terminal or user assigned to receive the information of the S-PDCCH (i) is the CWSI transmitted on the S-PDCCH (1), S-PDCCH (2), and S-PDCCH (i-1). You must be able to receive all the values so that you can correctly interpret the meaning of your CWSI (i) values. To this end, when the base station determines which user's information to transmit to which S-PDCCH (i), scheduling of the S-PDCCH (i) is stronger than S-PDCCH (i + 1) for any i. do.

In this case, it is possible to use fewer information bits than to interpret CWSI (i) independently to transmit CWSI.

In interpreting CWSI (i) with reference to the other CWSI (j), every S-PDCCH (i) may have a different structure, and if x_i = 5 for all i, then all S-PDCCH ( i) may use the structure of FIG. 3 equally. In interpreting the CWSI (i) with reference to the other CWSI (j), an embodiment is as shown in FIG. 5.

5 is a diagram illustrating an example of a CWSI analysis method when using 5 bits of CWSI according to the present invention.

Referring to FIG. 5, Walsh codes existing between the position calculated by Equation 1 and the position calculated by Equation 2 in Table 1 are Walsh codes used for transmission of PDCH (m).

That is, Walsh codes used for the transmission of PDCH (m) are the starting point 14 [= CWSI (1) + CWSI (2) + ... + CWSI (m-1) = 14] and the ending point in the table of FIG. Codes between 19 [= CWSI (1) + CWSI (2) + ... + CWSI (m)]. At this time, in particular, the starting point of the PDCH 1 is zero.

Here, the Walsh code space information is not known to the terminals through the broadcast method, but it can be seen that 26 codes from the top code to the bottom of the codes in Table 1 are constituent codes of the Walsh code space.

Referring to the other CWSI (j), in interpreting the CWSI (i), another embodiment is as shown in FIG.

6 is a view showing another example of a CWSI analysis method when using 5 bits of CWSI according to the present invention.

Referring to FIG. 6, Walsh codes used between the positions corresponding to the values of the CWSI (m-1) and the positions corresponding to the values of the CWSI (m) in Table 1 are used by the Walsh codes for the transmission of the PDCH (m). Codes Here, although the Walsh code space is not known as a broadcasting method, it can be seen that 26 codes from the top code to the bottom of the codes of Table 1 are constituent codes of the Walsh code space.

Example 3-3

In interpreting CWSI (i) with reference to the other CWSI (j) received through a control channel, if a S-PDCCH (i) satisfies a specific condition, the terminal of the S-PDCCH (i) The number of CWSI bits x_i can be zero. This is illustrated in FIG. 7.

That is, when the Walsh code information is not transmitted through the broadcast channel, the transmission power of the control channel transmitted at a previous time among the plurality of control channels is greater than or equal to the transmission power of the control channel to be transmitted at the current time. Walsh code information of the control channel to be transmitted is not transmitted. Accordingly, a terminal receiving a control channel through which the Walsh code information is not transmitted may use codes other than Walsh codes used in other control channels at a current time among Walsh codes used in a plurality of control channels at a previous time. Interpret as

7 illustrates an example of control channels in time when CWSI is set to 0 bits according to the present invention.

In FIG. 7, S-PDCCH (i) transmitted in a specific time interval t is called S-PDCCH (i, t), CWSI on S-PDCCH (i, t) is called CWSI (i, t), and S Assume that the PDCH corresponding to -PDCCH (i, t) is PDCH (i, t).

Further, the control channel transmitted by the base station in a specific time interval t1 is S-PDCCH (1, t1), S-PDCCH (2, t1),, S-PDCCH (L, t1), and then in the next time interval t2. Assume that the control channel being transmitted is S-PDCCH (1, t2), S-PDCCH (2, t2), and S-PDCCH (M, t2). Where L and M are arbitrary natural numbers.

At this time, in the [Example 3-2], if the following conditions are met, the number of bits of the CWSI of the S-PDCCH (M, t2) may be zero.

That is, the transmission power of the S-PDCCH (L, t1) is greater than or equal to the transmission power of the S-PDCCH (1, t2). In this case, the Walsh code used to transmit PDCH (M, t2) transmits {S-PDCCH (1, t1), S-PDCCH (2, t1),, S-PDCCH (L, t1)}. The rest of the Walsh codes used to transmit {S-PDCCH (1, t2), S-PDCCH (2, t2),, and S-PDCCH (M-1, t2)} are used. .

Fourth Example

N _{max_PDCH} is greater than 1, which is a case where Walsh code space information is informed by a broadcast method. In this case, it is assumed that the terminals know which codes on the code priority usage table constitute the Walsh code space.

Each N _{max_PDCH} PDCH (i) and S-PDCCH (i) are used. In the following, it is assumed that i = 1, 2, and N _{max_PDCH} .

In this case, CWSI (i) is information on codes used to transmit PDCH (i) among Walsh code spaces or codes on a code priority list, and x_i, which is the number of information bits of CWSI (i), is Walsh. It is determined by the number needed for the Walsh code information transmission used on the code space or on the 'code priority list'. In this case, the CWSI (i) value may mean the number of codes or may mean a specific combination of codes belonging to the Walsh code space or the code priority list according to a specific rule.

In order to broadcast the Walsh code space information, any one of S-PDCCH (i) may be used in the following manner. It is assumed below that S-PDCCH 1 is used.

First, information bits on the S-PDCCH 1 are designated. The MAC identifier is (000000) ₂ and the sub packet identifier is (11) ₂ . In addition, two bits of the ARQ channel identifier and three bits of the encoder packet size are combined to form five-bit Walsh code space information (Walsh_Space_Indication_ID; hereinafter referred to as WSI), and the x_1 bit of the CWSI 1 is reserved for other purposes. On the contrary, the information bits of the CWSI 1 may be used as the WSI, and the information bits of the ARQ channel identifier and the information bits of the encoder packet size may be left for other purposes.

4-1 Operation Example

In interpreting each CWSI (i), it operates to refer to values of other CWSI (j) (i ≠ j). That is, it operates to refer to the values of other CWSI (j), and the base station variably operates the number of bits x_i of CWSI (i) according to the value of N _{real_PDCH} .

Here, Walsh code usage information of a specific control channel is not transmitted among a plurality of transmitted control channels. (x_i = 0)

Accordingly, a terminal that receives a channel for which the Walsh code usage information is not transmitted or detects its identifier may use a Walsh received through its control channel among codes other than Walsh codes used for other data transmission channels in Table 1. The code number according to code usage information is interpreted as being used. Walsh code information used for the other data transmission channel includes information about the start and end positions in the sorted Walsh codes through the corresponding control channel. At this time, the transmission power of the control channel transmitted to a specific terminal so that the terminal can receive all of the plurality of control channels is greater than the transmission power of the control channel for the other terminal.

First, in analyzing each of the CWSI (i), the method of determining the number of x_i bits of the base station is determined according to N _{real_PDCH} as follows.

For example, when N _{real_PDCH} is 1, that is, when only the S-PDCCH 1 is transmitted, only x_1 is needed, and thus x_1 is determined to be zero. However, when N _{real_PDCH} = M> 1, i.e., transmitting S-PDCCH (1), S-PDCCH (2), and S-PDCCH (M), x_M is determined to be 0 and x_i except x_M. Is determined by a value other than 0. In the following, it is assumed that x_i has any one of 0 and 5. That is, if the information bit belonging to S-PDCCH (i) is 13 bits, it means x_i = 0 (meaning no Walsh code information is transmitted). If the information bit belonging to S-PDCCH (i) is 18 bits, x_i = 5 means.

At this time, the operation method of the terminal is performed as follows.

That is, the terminal has a sequence of PDCCH (1), S-PDCCH (2), and S-PDCCH (N _{max_PDCH} ) until x_i of S-PDCCH (i) is 0 or its MAC identifier is detected. Attempts to receive the S-PDCCH (i) by appointment with the base station.

And, the meaning of CWSI (i) is interpreted as the following cases. That is, when the S-PDCCH (i) in which the control channel does not include Walsh code information or its MAC identifier is detected, i is 1 and x_1 is 0, walsh (all) for transmission of the PDCH (1). ). However, if S-PDCCH (i) where the control channel does not contain Walsh code information or its MAC identifier is detected, i is greater than 1 and x_i is 5, CWSI (i) refers to other CWSI (j). In order to analyze CWSI (i), the analysis is performed in the manner of the above-mentioned 3-2 operation example.

Or if the control channel does not contain Walsh code information or the S-PDCCH (i) in which its MAC identifier is found, i is greater than 1 and x_i is 0, CWSI (1) to CWSI (i-1). The meaning is interpreted in the same manner as in the above 3-2 operation example.

In this case, the CWSI (i) may select the PDCH (i) from the codes belonging to the Walsh code space except for the codes used by the PDCH (1), PDCH (2), PDCH (3), and PDCH (i-1). It is meant to be used for transmission.

In a fourth operation example, a terminal or user assigned to receive information of S-PDCCH (i) transmits on S-PDCCH (1), S-PDCCH (2), and S-PDCCH (i-1). You must be able to receive all the CWSI values being used so that you can correctly interpret the meaning of your CWSI (i) values. To this end, when the base station determines which user's information to transmit to which S-PDCCH (i), it allocates the S-PDCCH (i) to be stronger than the S-PDCCH (i + 1) for any i. shall.

4-2 Operation Example

In the case where the terminal interprets each CWSI (i) received through the control channels, the base station operates to refer to the values of other CWSI (j) (i ≠ j), and the base station _{performs the} CWSI regardless of the N _{real_PDCH} value. The number of bits x_i of (i) is fixedly used. At this time, the method of determining the number of x_i bits of the base station is as follows.

Walsh code usage information of any one control channel except for a specific control channel among the plurality of channels transmitted to the terminal is not transmitted. The terminal attempts to receive a plurality of control channels until the terminal detects its identifier. The terminal detecting its identifier interprets that the Walsh code usage information of the corresponding control channel is used as much as the number of corresponding information starting from the lower priority Walsh code in codes other than Walsh codes used in other control channels. At this time, the transmission power of the control channel where its identifier is detected is smaller than the transmission power of other control channels.

For example, the base station fixes x_1 at 0, and i determines x_i except 1 as a value other than 0. Hereinafter, x_1 is 0 and i is assumed that x_i except 1 is 5. That is, the information bits belonging to S-PDCCH (1) are always 13 bits, and the other information bits belonging to S-PDCCH (i) are 18 bits.

The operation of the terminal is as follows.

That is, the terminal tries to receive S-PDCCH (i) in the order of S-PDCCH (N _{max_PDCH} ), S-PDCCH (N _{max_PDCH-} 1), and S-PDCCH (1) until its MAC identifier is found. Try.

At this time, the terminal interprets the meaning of CWSI (i) as the following cases. First, when S-PDCCH (i) where its MAC identifier is found is i greater than 1, PDCH (i + 1), PDCH (i + 2), and PDCH (N _{max_PDCH} among codes belonging to the Walsh code space. Among the codes except for the code used by), the number of codes indicated by the value of CWSI (i) starting from the code having the lowest priority on the 'Code priority use table' is interpreted as being used for the transmission of PDCH (i).

Other details can be inferred by referring to the description of the operation example 3-2.

That is, when S-PDCCH (i) where its MAC identifier is found, i is 1, codes used by PDCH (2), PDCH (3), and PDCH (N _{max_PDCH} ) among the codes belonging to Walsh code space are used. The remaining codes are interpreted as being used for the transmission of the PDCH 1. Other details can be inferred by referring to the description of the operation example 3-2.

In a fourth operation example, a terminal or a user assigned to receive information of S-PDCCH (i) includes S-PDCCH (i + 1), S-PDCCH (i + 2), and S-PDCCH (N _{max_PDCH} ). It is necessary to be able to receive all the CWSI values being transmitted in order to correctly interpret the meaning of their CWSI (i) values.

To this end, when the base station determines which user's information to transmit to which S-PDCCH (i), the base station allocates the S-PDCCH (i) to transmit power weaker than that of the S-PDCCH (i + 1). shall.

5th Example

In cases where the Walsh code space information is not informed by the broadcasting method among all the above examples, the value of any one or several kinds of information bit types on the S-PDCCH (i) may be predetermined values. In this case, the remaining information bit types may be used by the base station for other purposes.

The following is an example under the assumption that the information bits of S-PDCCH (i) are shown in Table 3 and x_i is 5.

For example, the terminal and the base station, if the MAC identifier of any S-PDCCH (i) is (000000) ₂ , the encoder packet size, ARQ channel identifier, subpacket transmitted on the S-PDCCH (i) It promises in advance that the information bit values of the identifier have different meanings than before.

Then, rules about how to interpret the information bits of the encoder packet size, the ARQ channel identifier, and the subpacket identifier are determined.

Hereinafter, values of information bits of an encoder packet size, an ARQ channel identifier, and a subpacket identifier are called new information (NewInfo).

If the MAC identifier of S-PDCCH (i) is (000000) ₂ , the information bits of the encoder packet size, ARQ channel identifier, and subpacket identifier transmitted on the S-PDCCH (i) are determined by the base station. i) Specific information (eg, signaling information) to be delivered to the received terminals.

6th Example

In all the above operation examples, one or more S-PDCCH (i) having the same MAC identifier may exist among several S-PDCCHs being transmitted simultaneously. That is, among the {S-PDCCH (1), S-PDCCH (2), and S-PDCCH (N _{real_PDCH} )} being transmitted simultaneously, the S-PDCCH (i) and S-PDCCH (j) (i ≠ j) The MAC identifiers may be the same.

In this case, the terminal regards PDCHs corresponding to the S-PDCCHs having the same MAC identifier as one or all PDCHs and treats them as one PDCH and performs a reception process (for example, decoding and error correction code check). In other words, the PDCH is regarded as one channel and signal processing is performed.

6-1 Operation Example

The terminal determines which of the PDCHs corresponding to S-PDCCHs having the same MAC identifier as one by referring to the values of the remaining information bits except the MAC identifier.

If S-PDCCHs having the same MAC identifier but different values among encoder packet size, ARQ channel identifier, and subpacket identifier, the terminal regards PDCHs corresponding to the corresponding S-PDCCHs as different PDCHs. The reception process is performed separately for each PDCH.

However, for S-PDCCHs having the same MAC identifier and having the same values of encoder packet size, ARQ channel identifier, and sub packet identifier, the terminal regards PDCHs corresponding to the corresponding S-PDCCHs as one PDCH. The reception process is performed on one PDCH. At this time, the Walsh codes used to transmit the PDCH are all Walsh codes known to be used by PDCHs corresponding to the corresponding S-PDCCHs.

For example, MAC identifiers, encoder packet sizes, ARQ channel identifications, and subpacket identifiers of the S-PDCCH 2 and the S-PDCCH 5 which are being transmitted at the same time are all the same, and the PDCH 2 and the PDCH 5 are replaced with each other. Assume that Walsh codes used for transmission are {w31, w15, w23} and {w22, w6, w26, w10, w18}, respectively.

At this time, the PDCH 2 and the PDCH 5 are actually transmitted as one PDCH, and {w31, w15, w23, w22, w6, w26, w10, w18} are used to transmit one PDCH. It is used. The control information for this one PDCH is the MAC identifier, encoder packet size, ARQ channel identifier, and subpacket identifiers of the S-PDCCH 2 (or S-PDCCH 5).

6-2 Operation Example

In the above 6-1 operation example, in determining which PDCH to be considered as one of the PDCHs corresponding to the S-PDCCHs having the same MAC identifier, the new information value described in the operation example 5 (NewInfo) See.

Seventh operation example

In all the above examples, in order to increase the efficiency of the system, information bits called a code division multiple indicator (hereinafter referred to as CDMI) are added to the information bits of the S-PDCCH (i). In this case, the purpose of the CDMI is to allow the terminals to know the number of control channels transmitted by the current CDM scheme.

In this case, the information bit types and the number of bits of the S-PDCCH (i) are shown in Table 4. When the CDMI on the S-PDCCH (i) is called CDMI (i), the CDMI (i) interprets the current S-PDCCH (i) in the terminal and then whether there is an additional S-PDCCH to be received. In this case, the terminal can infer the number of control channels transmitted by the current CDM scheme.

7-1 Operation Example

Y_i may be the same for all i. If y_i is 1 for all i and the terminal receives S-PDCCH (i) according to a predetermined rule, the terminal is to receive S-PDCCH (k) as follows.

CDMI (i) = (0) ₂ means do not attempt to receive S-PDCCH (k) because S-PDCCH (k) does not exist, and CDMI (i) = (1) ₂ means S-PDCCH (k ), It means to try to receive S-PDCCH (k) if necessary.

7-2 Operation Example

Y_i may be variable for each i. For example, when y_i may be 1 or y_i may be 0 for each i, and the terminal is configured to receive S-PDCCH (k) after receiving S-PDCCH (i) according to a predetermined rule. As follows.

If the number of information bits of the CDMI (i) is 1 (that is, y_i = 1), this means that S-PDCCH (k) does not exist and thus does not attempt to receive S-PDCCH (k).

Alternatively, if the number of information bits of CDMI (i) is 0 (that is, y_i = 0), this means that S-PDCCH (k) is present, and therefore, if necessary, an attempt is made to receive S-PDCCH (k).

For the seventh operating example, the terminal needs an additional device capable of detecting different number of bits of the CDMI.

As an example of an additional device, when generating an S-PDCCH, a method of generating error detection bits may be different according to the number of bits of y_i.

Information bit type of S-PDCCH (i) Number of information bits Encoder packet size 3 ARQ channel identifier 2 Subpacket identifier 2 Walsh Code Usage Information (CWSI) x_i CDMI y_i MAC identifier 6 Total bits = (13 + x_i + y_i) bits

8th Example

In all the above operational examples, in order to increase the utilization of Walsh codes, Walsh codes (i.e., codes on WCL) designated to transmit S-PDCCH (i) are assigned to the corresponding S-PDCCH (i). If not used, it can be used for transmission of PDCH.

In this case, the base station should inform the terminals of which PDCH codes on the WCL are used for transmission, and the CDMI of the seventh operating example is used for this purpose.

That is, the base station expresses which code of the codes on the WCL is used for which PDCH by using a specific value of the CDMI, and the terminal determines on which S-PDCCH (i) the specific value of the CDMI is found on the WCL. Determine which of the codes is used for which PDCH.

After the terminal receives the S-PDCCH (i) according to a predetermined rule, the terminal is configured to receive the S-PDCCH (k), and CDMI (i) = 0 means that the S-PDCCH (k) does not exist. It is _assumed that N _{max_PDCH} is 4 and WCL = {wcl (1), wcl (2), wcl (3), wcl (4)}.

For example, when a CDMI (i) value on a S-PDCCH (i) is 0, codes used for transmission of PDCH (i) corresponding to S-PDCCH (i) are {PDCH (i). Codes on the 'Code Priority Table' allocated for transmission} and {the code on the WCL not used for S-PDCCH (1), S-PDCCH (2), and S-PDCCH (i) with the terminal. Codes satisfying a predetermined condition among branches. That is, if the S-PDCCH having a CDMI value of 0 is S-PDCCH (2), codes satisfying a predetermined condition between the terminal and the branch station among wcl (3) and wcl (4) are used to transmit PDCH (2). To be used in addition

9th Example

The concept and operation methods of CWSI described in the above operation examples may be applied to a packet data transmission system having a similar TDM / CDM scheme in addition to the above operation examples.

As described above, the present invention can reduce the waste of available resources by operating the CDM / TDM. In addition, if the CDM / TDM is operated and the Walsh code information is transmitted to the terminals according to the present invention, efficient power usage and safe Walsh code information transmission are ensured in the Walsh code information transmission.

Those skilled in the art will appreciate that various changes and modifications can be made without departing from the spirit of the present invention.

Therefore, the technical scope of the present invention should not be limited to the contents described in the examples, but should be defined by the claims.

Claims (40)

delete delete delete delete delete delete delete delete delete delete delete delete delete delete delete delete delete delete delete delete delete In the method for receiving packet data in the terminal of the mobile communication system, Receiving first control information including first Walsh code usage information over a first packet data control channel; Receiving second control information including second Walsh code usage information over a second packet data control channel; Receiving first packet data over a first packet data channel using a first portion on the Walsh code space indicated by the first Walsh code usage information; And Receiving second packet data over a second packet data channel using a second portion of the Walsh code space indicated by the first Walsh code usage information and the second Walsh code usage information. Way. The method of claim 22, Wherein the first Walsh code usage information indicates a last code assigned to the first packet data channel in the Walsh code space. The method of claim 23, wherein Wherein the second Walsh code usage information indicates a last code assigned to the second packet data channel in the Walsh code space. The method of claim 23, wherein And the first and second packet data channels are forward packet data channels transmitted from a base station. The method of claim 25, The transmit power or transmit energy of the first packet data control channel is greater than the transmit power or transmit energy of the second packet data control channel. The method of claim 22, If the first Walsh code usage information is cwsi0, the first portion on the Walsh code space includes codes from a code with index 0 to a code with index (cwsi0 + 1). . The method of claim 27, And if the second Walsh code usage information is cwsi1, the second portion of the Walsh code space comprises codes from (cwsi0 + 1) to cwsi1. The method of claim 22, And wherein the first packet data control channel and the second packet data control channel are determined based on transmit power. In the method for transmitting packet data in a mobile communication system, Transmitting first control information including first Walsh code usage information to at least one terminal through a first packet data control channel; Transmitting second control information including second Walsh code usage information to the at least one terminal through a second packet data control channel; Transmitting first packet data to the at least one terminal through a first packet data channel using a first portion on the Walsh code space indicated by the first Walsh code usage information; And Transmitting second packet data to the at least one terminal via a second packet data channel using a second portion of the Walsh code space indicated by the first Walsh code usage information and the second Walsh code usage information. Comprising a data transmission method. The method of claim 30, The transmit power or transmit energy of the first packet data control channel is greater than the transmit power or transmit energy of the second packet data control channel. The method of claim 30, And the first Walsh code usage information indicates a last code assigned to the first packet data channel in a Walsh code space. The method of claim 30, And the second Walsh code usage information indicates a last code assigned to the second packet data channel in a Walsh code space. The method of claim 30, And the first packet data and the second packet data are transmitted by a code division multiplexing (CDM) scheme. The method of claim 30, And the first packet data and the second packet data are transmitted to two terminals during the same time interval. The method of claim 30, Wherein the first and second Walsh code usage information indicates the number of Walsh codes on a Walsh code space in which the codes are ordered according to priority. The method of claim 30, And the first and second packet data channels are transmitted simultaneously. The method of claim 37, And the first and second packet data channels are transmitted simultaneously. The method of claim 30, If the first Walsh code usage information is cwsi0, the first portion on the Walsh code space includes codes from a code with index 0 to a code with index (cwsi0 + 1). . The method of claim 39, If the second Walsh code usage information is cwsi1, the second portion of the Walsh code space includes codes from (cwsi0 + 1) to cwsi1.

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