KR100943895B1 - Physical transmission channel chain - Google Patents

Abstract

The present invention relates to a physical transport channel, and more particularly, to a physical transport channel in which a user or a base station is suitable for efficiently transmitting periodic or aperiodic information bits to a plurality of users in a wired or wireless communication system. As described above, the physical transport channel chain includes a bit string repeating block including a plurality of bit string repeating units repeating the plurality of bit units a plurality of times when information bits for a plurality of users are input in a plurality of bit units per frame. A mux for multiplexing the output bits of the bit string repeating block, a symbol repeater for repeatedly outputting the bit strings multiplexed and output from the mux, and a symbol repeated output bit output from the symbol repeating unit A signal mapping unit for outputting a string to a set output value, a channel gain unit for determining and outputting a set transmission power according to the mapped output bit string output from the signal mapping unit, and generates a random integer to the mux and the channel gain unit And an offset calculator.

Physical transport channel

Description

Physical transmission channel chain

1 is a block diagram showing a transmission chain for explaining a physical transport channel according to the prior art

2 is a block diagram showing a transmission chain for explaining a physical transport channel according to the first embodiment of the present invention.

3 is a block diagram showing in detail the present invention the offset calculator

4 is a block diagram showing a transmission chain for explaining a physical transport channel according to a second embodiment of the present invention.

* Description of the symbols for the main parts of the drawings *

100, 200: bit string repeat block 140, 240: mux

150,250: symbol repetition unit 160,260: signal mapping unit

170, 270: channel gain section

The present invention relates to a physical transport channel, and more particularly, to a physical transport channel chain in which a user or a base station is suitable for efficiently transmitting periodic or aperiodic information bits to a plurality of users in a wired or wireless communication system.

Among conventional wired and wireless communication systems, a forward common power control channel (F-CPCCH) exists as a physical transmission channel used when a base station periodically transmits one bit of information bits to a plurality of users. (physical layer standard from cdma2000 Release C).

Hereinafter, a physical transport channel according to the prior art will be described with reference to the accompanying drawings.

1 is a block diagram showing a transmission chain for explaining a physical transport channel according to the prior art.

The physical transmission channel according to the related art basically includes first and second muxes 10 and 20 which mux a plurality of I-axis and Q-axis input power control bits, and first and second symbols which symbolly repeat the muxed control bits. The repeaters 11 and 21, the first and second signal mapping units 12 and 22 for converting the repeated signals outputted to a specific output value according to a predetermined rule, and the first and second signal mapping units 12 and 22. And first and second channel gain units 12 and 23 for determining the transmission power according to the output of the < RTI ID = 0.0 > In this case, the first and second mux 10 and 20 mux the input power control bits and the relatively random integers in the offset calculator 33.

In addition, in FIG. 1, Non-TD and TD mean a type of modulation scheme.

Non-TD refers to a method of transmitting after modulation without using transmit diversity, and TD refers to a method of transmitting after modulating using transmit diversity.                         

Representative TD methods include Orthogonal Transmit Diversity (OTD) and Space Time Spreading (STS).

The final outputs X _I and X _Q of FIG. 1 are input to the modulator according to the selected transmission scheme.

The channel is a physical transport channel that can be used to transmit only one information bit consisting of one kind of one bit.

If the transport channel structure is used to transmit various types of information bits or information bits consisting of a plurality of bits, a large number of physical transport channels having the same structure are required. As a result, resources such as Walsh code are required. There is a problem that can suffer from the lack of.

Therefore, there is a need for the design of a physical transport channel that can simultaneously transmit multiple types of information bits consisting of several bits.

The present invention has been made in view of the above-described problems of the prior art, and in a wired / wireless communication system, a single user or a base station is suitable for efficiently transmitting periodic or aperiodic information bits to a plurality of users. To provide a channel chain.

In addition, the present invention is to provide a physical transport channel chain that can be used when sending a plurality of types of information bits simultaneously using a physical transport channel of one structure.

According to one aspect of the present invention, a bit string repeating block comprising a plurality of bit string repeating units repeating the plurality of bit units a plurality of times when information bits for a plurality of users are input in a plurality of bit units per frame; A mux for multiplexing the output bits of the bit string repeating block, a symbol repeater for repeatedly outputting the bit strings multiplexed and output from the mux, and a symbol repeated output bit output from the symbol repeating unit A signal mapping unit for outputting a string to a set output value, a channel gain unit for determining and outputting a set transmission power according to the mapped output bit string output from the signal mapping unit, and generates a random integer to the mux and the channel gain unit And an offset calculator.

Preferably, the number of transmission symbols transmitted per frame is M, the chip rate is a, the transmission length of one frame is b, and a non-transmission diversity (Non-TD) scheme of the physical transmission channel. The length of the Walsh code used for the W_non_TD is called, the length of the Walsh code used for the transmission diversity (TD) method of the physical transport channel is called W_TD, when the W_TD = W_non_TD / 2, the transmission symbol The number M is characterized by obtaining a × b / W_non_TD.

Preferably, the bit string repeater may be n when the information string repeats the bit string in units of p bits inputted by p bits per frame a plurality of times. When n = M / p × N is characterized in that.                         

Preferably, the output data rate of the mux is M / b when the number of transmission symbols transmitted per one frame is M and the transmission length per one frame is b.

Preferably, a unit in which the information bits are input is called p (or q), the plurality of users is referred to as N (or N '), and the plurality of times is referred to as n (or m), where n = M The variables in / p × N are

It is characterized by having one of the values of.

Preferably, the physical transport channel is at least one of the I-axis and the Q-axis, the user of the I-axis and the Q-axis is the same user or a different user, if the same user the plurality of information bits for the same user is It is transmitted through the I-axis and the Q-axis.

Preferably, the transmission mode of the I and Q axis is characterized in that the same transmission mode.

Preferably, when the maximum number of users to receive information transmitted through the I-axis and the Q-axis of the physical transport channel in the one frame, the mux of each of the I-axis and Q-axis share the output value of the offset calculation unit It is characterized by.

Preferably, when the base station transmits different types of information bits to a plurality of users using the information bits, the information bits include ACK / NACK information and reverse transmission rate control information.

Preferably, the ACK / NACK information is characterized by consisting of one bit and two bits.

Preferably, the reverse rate control information, characterized in that composed of one bit and two bits.

Preferably, when the transmission information bits of the I-axis and the Q-axis are p and q, respectively, the ACK / NACK information and the reverse transmission rate control information,

It is characterized by consisting of one.

According to another feature of the present invention as described above, if the information bits for a plurality of users are input in a plurality of bit units per frame, a bit string repetition consisting of a plurality of bit string repeaters for repeating the plurality of bit units a plurality of times A signal mapping unit for receiving the output bits of the block, the bit string repetition block and outputting the output bits at a predetermined output value, a channel gain unit for determining and outputting a set transmission power according to the bit string output from the signal mapping unit; A mux for receiving and outputting multiplexed output bits of a channel gain unit, a symbol repetition unit for receiving a plurality of bit strings multiplexed and outputted from the mux, and repeatedly outputting a plurality of times, and an offset calculator for generating a random integer with the mux Characterized in that configured to include.

According to another feature of the present invention as described above, a bit string repetition to be transmitted to the I, Q-axis channel of the transmission channel in a channel in which one base station simultaneously transmits at least one or more types of information bits to a plurality of terminals The number of times is determined according to the maximum number of terminals to be transmitted in each channel, the number of information bits for each terminal, and the number of symbols per frame.

More specifically, the information bits of the I or Q channel are characterized in that the reverse power control bit and ACK / NACK bits.

More specifically, the information bits of the I or Q channel is characterized in that one of the reverse power control bit and the ACK / NACK bits, respectively.

Other objects, features and advantages of the present invention will become apparent from the detailed description of the embodiments with reference to the accompanying drawings.

Hereinafter, a physical transmission channel in a wired or wireless communication system according to the present invention will be described with reference to the accompanying drawings.

2 is a block diagram illustrating a physical transport channel according to the first embodiment of the present invention.                     

First, for convenience of explanation, the physical transmission channel according to the present invention will be described in a mobile communication system using the CDMA method. That is, it is assumed that the base station according to the present invention is a forward physical transport channel used when a base station needs to send several types of information bits to a plurality of users (or terminals) at the same time. However, the transmission channel of the same structure can be applied to other systems.

The variables used in FIG. 2 and the variables used in the following description are defined as follows.

a: Chip rate

b: transmission length of one frame

W_non_TD: Length of Walsh code used for non-TD transmission of physical transport channel of the present invention

W_TD: length of Walsh code used for TD transmission of a physical transport channel of the present invention

M: Number of transmitted symbols per frame

N: maximum number of users to receive information transmitted on the I-axis of the physical transport channel of the present invention within one frame

N ': Maximum number of users to receive information transmitted on the Q-axis of the physical transport channel of the present invention within one frame.

User (k, I): k-th user to receive the information transmitted through the I-axis of the physical transport channel of the present invention                     

User (k ', Q): k'-th user to receive the information transmitted through the Q-axis of the physical transport channel of the present invention

The following relations are established between the variables.

M = a × b / W_non_TD

W_TD = W_non_TD / 2

If a = 1.2288M (cps), b = 20 (m sec), and W_non_TD = 128, M = 192 by Equation (1).

First and second bit string repetition blocks (100,200) configured by a plurality of bit string repeaters (110,120,130) (210,220,230) for repeating information bits from a plurality of users in a plurality of bit units a plurality of times; First and second muxes 140 and 240 respectively receiving and outputting the output bits of the second bit string repetition block 100 and 200, and bit streams multiplexed and output from the first and second muxes 140 and 240, respectively. Receives a symbol repeated after receiving the first and second symbol repeaters 150 and 250 and the symbol repeated output bit strings output from the first and second symbol repeaters 150 and 250, respectively. Determine and output the set transmission power according to the mapped output bit strings output from the first and second signal mapping units 160 and 260 and the first and second signal mapping units 160 and 260, respectively. First and second channel gain units 17 0,270).                     

The operation principle of each part of the I-axis among the physical transport channels shown in FIG. 2 is as follows.

Information bits (0 to N-1) for each N users are generated p bits per frame.

In this case, if there is no information bit to be transmitted for the corresponding frame for the user, the corresponding transmission part may be left empty or a bit having a specific value may be inserted to indicate that there is no information bit to be transmitted.

If the corresponding transmission part is left empty, the signal mapper 160 and 260 may use a symbol presence indicator to map a signal so that the signal is not transmitted through the actual physical transmission channel during the corresponding part.

In the following, it is assumed that the information bits of each user are as follows.

User(N-1, I):

User (N-1, I):

는 t번째 프레임 동안 j번째 사용자를 위해 발생된 s번째 정보 비트를 의미한다.In Equations 3 to 5 above

Denotes the s th information bit generated for the j th user during the t th frame.

Information bits for each user are input to the first bit string repeating block 100 with p bits per frame. In this case, the first bit string repetition block 100 performs n repetitions in units of p bits. The value of n is determined by the following equation.

n = M / p × N

If M = 192, N = 48, p = 2, n = 2 by Equation 6. In this case, input bits corresponding to User (k, I) are output as follows.

Table 1 shows some examples of each variable according to Equation 6.

Outputs of the bit string repetition blocks 100 are output in a line through the first MUX 140. At this time, the operating speed of the first mux 140 is uniform, and as a result, the data rate of the output bits of the first mux 140 is constant. At this time, the data rate of the output bits of the first mux 140 is as follows.

MUX output data rate (bps) = M / b

If b = 20 (m sec) and M = 192, the data rate of the output bits of the MUX is 9600 bps by Equation (8).

On the other hand, the first offset calculator 180 is an offset calculator for the I-axis, and is a part that generates a relatively random integer periodically.

For example, the first offset calculator 180 generates an integer of one of {0, 1, 2,, N-2} whenever a total of N bits are input by one bit from each bit string repeater 110, 120, and 130. To make it work.

The offset calculator 180 may use the offset generator used in the existing F-CPCCH, as shown in FIG.

The final working principle of MUX is as follows.

At any point in time, the N bits inputted to the first mux 140 are arranged in a line from the top in the figure, and then rotated by the output of the first offset calculator 180 and then output.

For example, when N = 12, the 12 bits inputted to the first mux 140 at one time point are arranged in order from the output of the upper bit string repeaters 110, 120, and 130 of the first bit string repeat block 100 in the drawing. If the results listed as                     

When the output value of the first offset calculator 180 is 3, the output of the first mux 140 is as follows.

The output bit string of the first mux 140 is repeated a number of times (for example, r times) set through the first symbol repetition unit 150.

For example, when Equation 10 is an input of the first symbol repeating unit 150 and r = 2, the output of the first symbol repeating unit 150 is as follows.

The first signal mapping unit 160 serves to change the input to a specific output value according to a predetermined rule. Equation 12 is an example.

0 → +1,

1 → -1,

If no symbol → 0                     

In Equation 12, no symbol (No_Symbol) means that there is no information bit to be transmitted during the frame for the user, as described above.

However, when the transmitting / receiving side promises a no symbol (No_Symbol) to each other, it may be used to describe a specific meaning.

For example, as shown in Equation 13, no symbol (No_Symbol) may be used to maintain a user's backward transmission data rate.

0: The user raises the reverse data rate.

1: The user lowers the reverse data rate.

No_Symbol: The user maintains the reverse data rate.

On the other hand, if necessary when mapping the signal in the first signal mapping unit 160, as mentioned above may be assisted by the symbol existence indicator.

Finally, the output of the first signal mapping unit 160 determines the transmission power through the channel gain. That is, the first signal mapping unit 160 calculates a predetermined value (that is, channel gain) according to the power amount to be used when the output signal of the first signal mapping unit 160 is actually transmitted via wire or wireless. Multiply the output by

The finally generated X _I is input to a Non-TD modulator or a TD modulator (not shown) depending on the mode used.

The operation principle of each part of the Q-axis of the physical transmission channel shown in FIG. 2 is the same as that of the I-axis operation. However, N 'and N may be the same value or different values.

Also, any User (i, I) and User (j, Q) may be the same user.

For example, when N = N ', User (i, I) and User (i, Q) may be the same user.

In this case, two information bits for one user will be transmitted through the I and Q axes, respectively. However, the transmission modes of I and Q must be the same. That is, if one axis is in Non-TD mode, the other axis must be in Non-TD mode. If one axis is in TD mode, the other axis must be in TD mode.

Meanwhile, when N = N ', the first offset calculator 180 and the second offset calculator 280 may have the same output. That is, one offset calculator can be used for both axes.

The physical transport channel shown in FIG. 2 can be variously modified to play the same role. For example, the signal mapping units 320, 330, 420, 430 and the channel gain units 340, 350, 440, and 450 in the physical transport channel according to the second embodiment of the present invention of FIG. 4 are located at the front end of the mux 360, 460 unlike FIG. 2. The outputs of 360 and 460 are output to the symbol repeaters 380 and 480.

The present invention having such a configuration and operation will be described according to its operation example.

For example, an operation example where the base station sends two types of information bits to each user is as follows.                     

One type of information bits is ACK / NACK information, and the other information bits are reverse transmission rate control information. Here, the ACK / NACK information indicates whether the base station has properly received a data packet transmitted from each user to the base station. Refers to information to inform.

For example, for data packets transmitted by each user to the base station, if the base station should inform each user whether or not one data packet is successfully received at a time, one bit of ACK / NACK information is sufficient.

In this case, an example of ACK / NACK information consisting of 1 bit is shown in Table 2.

For the data packets transmitted by each user to the base station, if the base station should inform each user whether the two data packets are successfully received at a time, two bits of ACK / NACK information are sufficient. In this case, an example of two bits of ACK / NACK information is shown in Table 3.

In Table 3, assuming that one of two data packets is Packet A and the other is Packet B, the preceding bit of ACK / NACK information consisting of 2 bits is ACK / NACK information for Packet A, and the ACK / NACK information The assumption that the second bit is ACK / NACK information for Packet B has been used.

The reverse transmission rate control information is control information about the data rate that each user is transmitting or transmitting to the base station.

For example, when each user is transmitting to the base station or controls the data rate to be transmitted to 1 bit, operations as shown in Table 4 or Table 5 are possible.

If each user is transmitting to the base station or controlling the data rate to be transmitted to 2 bits, the operation shown in Table 6 is possible.                     

Table 7 shows examples of possible operations when the above-described information bits are transmitted through the physical transport channel of FIG. 2.                     

In Table 7, i-ACK means that the ACK / NACK information is composed of i bits, j-Rate means that the reverse transmission rate control information is composed of j bits. For example, p = 3 (1-ACK + 2-Rate) means that the information bits transmitted to each user on the I-axis are 3 bits, which are 1 bit of ACK / NACK information and 2 bits. Means that it consists of reverse transmission rate control information.

Each variable related to FIG. 2 for the operation examples shown in Table 7 may be appropriately selected in consideration of the available transmission power and the desired transmission performance. For example, it can select from Table 1 according to the value of p, q, N, N '.

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 embodiments, but should be defined by the claims.

The physical transport channel according to the present invention as described above has the following effects.

First, one user or base station can efficiently transmit periodic or aperiodic information bits to multiple users.

Second, a plurality of types of information bits can be sent at the same time using a physical transport channel of one structure.

Claims (17)

A bit string repetition block including a plurality of bit string repetitions which repeat each of the information bits a predetermined number of times when information bits for a plurality of users are input in units of a multi-bit per frame; An offset calculator for generating a random integer; A mux for multiplexing the output bits of the bit string repeating block according to the random integer; A symbol repeater configured to repeatedly output the bit strings multiplexed by the MUX a plurality of times; A signal mapping unit outputting a symbol repeated output bit string output from the symbol repeating unit as a set output value; And A channel gain unit configured to determine a transmission power set according to the mapped output bit string output from the signal mapping unit and to output the mapped output bit string at the determined transmission power Comprising a physical transport channel chain. The method of claim 1, The number of transmission symbols transmitted per frame is M, the chip rate is a, the transmission length of one frame is b, and used for non-transmission diversity (Non-TD) scheme of the physical transmission channel. If the length of the Walsh code is called W_non_TD, the length of the Walsh code used for the transmission diversity (TD) method of the physical transport channel is called W_TD, when the W_TD = W_non_TD / 2, The number of transmitted symbols M is obtained by a × b / W_non_TD. The method of claim 1, When the information bits are transmitted through either the I axis or the Q axis of the physical transmission channel, the bit string repeater n times the bit string in units of the p bits in which the information bits are input p bits per frame. When repeating, if the number of transmission symbols per frame is M and the number of the plurality of users receiving the information bits through any one axis in one frame is N, The number of repetitions n of the bit string is n = M / p × N physical transport channel chain, characterized in that determined by. The method of claim 1, The output data rate of the mux, And if the number of transmission symbols transmitted per one frame is M and the transmission length per one frame is b, M / b. The method of claim 3, wherein The unit of the plurality of bits into which the information bits are input per frame is called p (or q), the number of the plurality of users is referred to as N (or N '), and the number of repetitions of the bit string is n (or m). In this case, The variables in n = M / p × N,

Physical transport channel chain, characterized in that it has one of the values. The method of claim 1, The physical transport channel is at least one of the I-axis and the Q-axis, and the user of the I-axis and the Q-axis is the same user or different users, and if the same user, the plurality of information bits for the same user and the I-axis Physical transport channel chain, characterized in that transmitted on the Q-axis. The method of claim 6, And the transmission mode of the I and Q axes is the same transmission mode. The method of claim 6, When the maximum number of users to receive the information transmitted on the I-axis and the Q-axis of the physical transmission channel in the one frame, the mux of each of the I-axis and Q-axis is characterized in that the output value of the offset calculator Physical transport channel chain. The method of claim 1, When the base station transmits different types of information bits to a plurality of users by using the information bits, the information bits, A physical transport channel chain, comprising ACK / NACK information and reverse transmission rate control information. The method of claim 9, The ACK / NACK information, the physical transport channel chain, characterized in that composed of one or two bits. The method of claim 9, The reverse transmission rate control information, the physical transport channel chain, characterized in that composed of one or two bits. The method of claim 6, When the base station transmits different types of information bits to a plurality of users by using the information bits, The information bit includes ACK / NACK information and reverse transmission rate control information. When the units of the plurality of bits of the information bits input per one frame of the I axis and the Q axis are p and q, respectively, the ACK / NACK information and the reverse transmission rate control information, Physical transport channel chain, characterized in that consisting of one of. A bit string repetition block including a plurality of bit string repetitions which repeat each of the information bits a predetermined number of times when information bits for a plurality of users are input in units of a multi-bit per frame; A signal mapping unit which receives the output bits of the bit string repeating block and outputs each of the output bits as a set output value; A channel gain unit configured to determine and output a set transmission power according to a bit string output from the signal mapping unit; An offset calculator for generating a random integer; A mux for multiplexing the output bits of the channel gain unit according to the random integer; And A symbol repeater that receives the bit streams multiplexed and output from the MUX and outputs the plurality of times repeatedly. Comprising a physical transport channel chain. In a channel in which one base station transmits at least one type of information bits to a plurality of terminals at the same time The number of bit string repetitions to be transmitted on the I-axis and Q-axis channels of the transmission channel is determined according to the maximum number of terminals to be transmitted on the channel, the number of bits of information bits for each terminal, and the number of symbols per frame. step; And And transmitting the information bits according to the determined number of bit string repetitions. The method of claim 14, The information bits of the I-axis or Q-axis channel are reverse power control bits and ACK / NACK bits, characterized in that the data transmission method of the physical transport channel. The method of claim 14, The information bits of the I-axis or Q-axis channel are each one of a reverse power control bit or an ACK / NACK bit. The method of claim 9, The physical transport channel is at least one of the I-axis and the Q-axis, When the units of the plurality of bits of the information bits input per one frame of the I axis and the Q axis are p and q, respectively, the ACK / NACK information and the reverse transmission rate control information,

Physical transport channel chain, characterized in that consisting of one of.

Images