KR20050118082A - Apparatus and method for allocating ovsf codes and i/q channels for reducing peak-to-average power ratio in transmitting data via enhanced up-link dedicated channels in wcdma systems - Google Patents

Abstract

The present invention assumes a situation in which an enhanced uplink dedicated transport channel (hereinafter referred to as 'EUDCH') is used in a wideband code division multiple access (WCDMA) system. do.

Increase of Peak-to-Average Power Ratio (hereinafter referred to as 'PAPR') of uplink transmission signal when physical channels for EUDCH data transmission are additionally transmitted in addition to existing physical channels in the user terminal Is induced. The increase in PAPR depends on the Orthogonal Variable Spreading Factor (OVSF) code and the in-phase / quadrature-phase (I / Q) channel applied to the corresponding physical channels. Accordingly, the present invention proposes an apparatus and method for allocating an optimal OVSF code and I / Q channel to EUDCH-related physical channels in order to minimize the increase of PAPR due to EUDCH.

Description

Method and apparatus for allocating orthogonal variable spreading codes and orthogonal phase channels for reducing maximum power-to-average power ratio when transmitting data through an improved uplink channel in an asynchronous mobile communication system {Apparatus and Method for allocating OVSF codes and I / Q channels for reducing peak-to-average power ratio in transmitting data via enhanced up-link dedicated channels in WCDMA systems}

The present invention relates to an asynchronous wideband code division multiple access (WCDMA) communication system, and refers to an enhanced uplink dedicated transport channel (EUDCH). The present invention relates to a device and a method for minimizing an increase in peak-to-average power ratio (PAPR) of a transmission signal during data transmission.

That is, an optimum Orthogonal Variable Spreading Factor (OVSF) code and I / Q (in-phase / quadrature-phase) channel allocation apparatus for uplink physical channels according to the EUDCH service And to a method.

Representative dedicated physical channels used for transmission of user signals in the uplink of a WCDMA system are currently referred to as dedicated physical data channels (DPDCHs) and dedicated physical control channels (hereinafter referred to as "dedicated physical control channels"). DPCCH '. The DPDCH is a data transmission channel through which user data such as voice and video are transmitted, and the DPCCH is a control information transmission channel on which information such as a pilot format for DPDCH demodulation and power control is carried.

In this regard, recently, a technique of using EUDCH, which is an enhanced uplink data dedicated transmission channel, has been proposed to improve packet data transmission speed and efficiency in uplink. The present invention assumes a situation in which EUDCH is used in a WCDMA system.

1 is a diagram illustrating information transmitted and received between a user terminal and a base station to perform uplink transmission.

Referring to FIG. 1, the UEs 110, 112, 114, and 116 transmit the packet data at different transmission powers according to distances from the Node B 100. The UE 110 farthest from the Node B 100 transmits packet data at the transmit power 120 of the highest reverse channel, and the UE 114 nearest the Node B is the lowest reverse channel. The packet data is transmitted at a transmission power 124 of. The Node B 100 may schedule the data to be inversely proportional to the strength of the transmit power of the reverse channel in order to improve the performance of the mobile communication system. In other words, a small data rate is allocated to a UE having the highest transmit power of the reverse channel, and a high data rate is allocated to a UE having the lowest transmit power of the reverse channel.

2 is a diagram illustrating information transmitted and received between a user terminal and a base station to perform uplink transmission. That is, FIG. 2 illustrates a basic procedure required between the Node B 200 and the UE 202 for packet data transmission on the EUDCH.

Referring to FIG. 2, in step 210, EUDCH is configured between the Node B 200 and the UE 202. Step 210 includes a process of transmitting and receiving messages through a dedicated transport channel. In step 212, the UE 202 transmits information about a required data rate and information indicating an uplink channel condition to the Node B 200. Information indicating the uplink channel status includes an uplink transmission power transmitted by the UE 202 and a transmission power margin of the UE 203.

The Node B 200 receiving the uplink transmission power may estimate the downlink channel condition by comparing the uplink transmission power and the reception power. That is, if the difference between the uplink transmission power and the uplink reception power is small, the uplink channel situation is considered good, and if the difference between the transmission power and the reception power is large, the uplink channel condition is considered poor. When the UE transmits a transmission power margin to estimate an uplink channel situation, the Node B 200 estimates the uplink transmission power by subtracting the transmission power margin from the maximum possible transmission power of a known UE. can do. The Node B 200 uses the estimated channel condition of the UE 202 and the information about the data rate required by the UE 202 to maximize the maximum possible packet for the uplink packet channel of the UE 202. Determine the data rate.

The determined maximum possible data rate is notified to the UE 202 in step 214. The UE 202 determines a data rate of packet data to be transmitted within a range of the maximum possible data rate reported, and transmits the packet data to the Node B 200 at the determined data rate in step 216.

Here, the uplink physical channels supporting the EUDCH service are Dedicated Physical Data Channels (hereinafter referred to as DPDCHs), Dedicated Physical Control Channels (DPCCHs), and HSDPA. High Speed Dedicated Physical Control Channel (hereinafter referred to as HS-DPCCH) for service, Enhanced Dedicated Physical Data Channel (E-DPDCH) for EUDCH service, Included is an Enhanced Dedicated Physical Control Channel (E-DPCCH ') for the EUDCH service.

That is, in step 216, the UE 202 transmits the control channel E-DPCCH to inform the frame format and channel coding information of the E-DPDCH channel, and transmits packet data through the E-DPDCH. Here, the E-DPCCH may be used for transmission of uplink data rate, transmission power margin, etc. required by the UE 202 and pilot information required for demodulation of the E-DPDCH by the Node B 200. Can be used.

As described above, when additional physical channels are additionally transmitted to existing physical channels for EUDCH packet data transmission, the number of physical channels transmitted in the uplink is increased, and accordingly, the maximum power versus average of the uplink transmission signal is increased. There is a problem that the power ratio (PAPR) increases. In general, the PAPR increases as the number of physical channels transmitted simultaneously increases.

The increase in the PAPR may increase the distortion of the transmission signal and the Adjacent Channel Leakage Power Ratio (ACLR) outside the allowed band, and thus, the radio frequency (hereinafter referred to as 'RF') of the UE. Power amplifiers require a power back-off that reduces the amplifier input power to avoid the problem. At this time, when the UE performs the power backoff, the reception power decreases in the receiver of the Node B, resulting in an increase in an error rate of received data or a decrease in cell coverage.

Accordingly, in order to reduce the PAPR increase, the UE intends to time-divided and transmit the EUDCH on an existing physical channel such as a DPDCH without transmitting the EUDCH on a separate physical channel. However, there is a disadvantage in that implementation complexity increases as the EUDCH is time-divided and transmitted on an existing physical channel.

In consideration of the above, the WCDMA system has proposed a method of multiplying and transmitting the physical channels by OVSF codes satisfying orthogonality with each other in uplink. Each physical channel multiplied by the OVSF code may be distinguished in Node B.

3 illustrates a tree structure of an orthogonal variable spreading index code generally used in a WCDMA system.

Referring to FIG. 3, the OVSF code can be simply generated from a calculation process of Equations 1 to 3 below.

As illustrated in FIG. 3, the OVSF codes have a feature that orthogonality is established between codes having the same Spreading Factor (hereinafter, referred to as 'SF'). Orthogonality is established between two codes having different SF values when a code having a large SF value cannot be generated from a code having a small SF value using Equation 3 above. This will be described as an example.

That is, when SF = 4, C _{ch, 4,0} = (1,1,1,1) is orthogonal to C _{ch, 2,1} = (1, -1), but C _{ch, 2,0} = Orthogonality does not hold with (1,1).

Also. As another example, comparing OVSF codes with SF = 256 and C _{ch, 2,0} = (1,1), the codes with indexes of OVSF codes from 0 to 127 are C _{ch, 2,0} = (1,1) Because they are generated from, they are not mutually orthogonal. That is, as a higher data transmission rate is required, a lower OVSF code is used. When transmitting a plurality of physical channels simultaneously, the OVSF code must be allocated so that orthogonality is established.

On the other hand, even if the two physical channels using the same OVSF code, if the transmission is divided into the I channel and Q channel of the transmitter, respectively, the receiver can separate and demodulate the two physical channel signals without mutual interference. This is because the signals transmitted on the I and Q channels are carried on a carrier wave having a phase difference of 90 degrees between each other.

As described above, the uplink PAPR increase depends on the number of physical channels transmitted simultaneously in the uplink, the power ratio between each physical channel, the OVSF code used for each physical channel, and the I / Q channel allocation of each physical channel. Different.

In this regard, when EUDCH technology is applied to the WCDMA system, when the E-DPCCH and E-DPDCH channels for EUDCH packet data transmission are simultaneously transmitted in addition to the uplink channels, the PAPR increases.

Therefore, in a mobile communication system supporting EUDCH, an OVSF code and I / Q channel allocation for reducing PAPR increase while maintaining orthogonality with existing DPCCH, DPDCH and HS-DPCCH is required. That is, there is a need for a method of optimizing OVSF code and I / Q channel allocation for E-DPCCH and E-DPDCH by supporting the EUDCH.

Accordingly, an object of the present invention for solving the above-mentioned problems of the prior art is to propose an apparatus and method for transmitting a user terminal for efficiently transmitting packet data through enhanced uplink in a mobile communication system.

Another object of the present invention is to propose an apparatus and method for allocating an orthogonal variable spreading code and an I / Q channel for minimizing an increase in the maximum power-to-average power ratio of an uplink transmission signal in a mobile communication system supporting uplink. .

It is still another object of the present invention to propose an apparatus and method for allocating I / Q channels and OVSF codes of E-DPDCH and E-DPCCH to minimize the increase of PAPR according to the presence or absence of HS-DPCCH and the number of codes of DPDCH. .

In order to achieve the above object of the present invention, an embodiment of the present invention provides a method of transmitting uplink packet data in a mobile communication system supporting enhanced uplink packet data transmission, wherein an orthogonal variable spread index (OVSF) code (256, 0) and a process of creating a dedicated physical control channel (DPCCH) using the Q channel, and when the spread index value of the _DPDCH is SF _DPDCH , the OVSF code (SF _DPDCH , SF _DPDCH / 4) The process of creating a dedicated physical data channel (DPDCH) using the I and I channels, and the SF value of the OVSF code to be allocated to the E-DPCCH for supporting enhanced uplink packet data transmission is SF _E-DPCCH. In this case, the process of generating an E-DPCCH using the OVSF code (SF _E-DPCCH , 1) and the I channel, and the SF value of the OVSF code to be allocated to the _E-DPDCH are SF _E-DPDCH , and the SF value SF OVSF code, if more than the _E-DPDCH 4 (SF _E-DPDCH, SF _E-DPDCH / 2) Generating an E-DPDCH using a Q channel, forming a complex symbol string by summing the generated I and Q channels, and then scrambling the complex symbol string, and performing an antenna operation on the scrambled complex symbol string Characterized in that the process through the transmission through.

In order to achieve the above object of the present invention, an embodiment of the present invention provides a method for transmitting uplink packet data in a mobile communication system supporting enhanced uplink packet data transmission using an orthogonal variable spread index (OVSF) code. Creating a dedicated physical control channel for supporting dedicated physical channels and high speed forward packet service, and generating dedicated physical channels for enhanced uplink packet data transmission using an OVSF code not used by the physical channels. And summing the complex symbol sequence by summing the generated I-channel and Q-channel signals of the generated channels, and transmitting the scrambled complex symbol sequence through an antenna. Characterized in that made.

Hereinafter, the present invention will be described in detail with reference to the accompanying drawings. In describing the present invention, when it is determined that a detailed description of a related known function or configuration may unnecessarily obscure the subject matter of the present invention, the detailed description thereof will be omitted.

The present invention proposes an OVSF code and an I / Q channel allocation method for minimizing PAPR increase of uplink transmission signals in supporting EUDCH data services in a WCDMA system. Thus, the present invention proposes an optimized OVSF code and I / Q channel allocation method when E-DPCCH, which is a control channel for EUDCH packet data transmission, and E-DPDCH, which is a data channel, are additionally transmitted to an existing physical channel. In addition, in order to improve the EUDCH data rate and minimize the increase of PAPR, a method for changing the OVSF code allocation of the HS-DPCCH, which is a physical channel of the existing Rel-5 standard WCDMA system, is also proposed.

In the existing Rel-5 WCDMA standard, the OVSF code and I / Q channel allocation of the HS-DPCCH channel can be lowered in consideration of the maximum number of DPDCHs that can be determined when establishing a radio link between the UE and Node B. It was decided.

Similarly, the OVSF code and I / Q channel allocation of the E-DPDCH and the E-DPCCH proposed by the present invention are based on the number of Rel-5 physical channels such as the maximum number of DPDCHs that can be transmitted in the radio link and whether HS-DPCCH is transmitted. It depends on the setting. Thus, the assignment rule for E-DPCCH and E-DPDCH is determined in a direction that can minimize PAPR under a given DPDCH and HS-DPCCH setup.

Since a high data rate transmission of up to several Mbps must be available for EUDCH service, the E-DPDCH physical channel can transmit several channels at the same time, and the control physical channel, E-DPCCH, will generally be sufficient for one channel transmission. In initial radio link setup, OVSF codes other than those allocated for DPDCH are allocated to E-DPDCH in consideration of the maximum number of DPDCHs that can be transmitted, and thus the E-DPDCH is allocated according to the number of E-DPDCHs required for EUDCH data transmission. The selected OVSF code is used to transmit the E-DPDCH.

Meanwhile, in the technique for reducing the PAPR increase of the uplink transmission signal proposed in the present invention, backward compatibility with an existing WCDMA system is considered important. The reason is that if the compatibility between the DPDCH and DPCCH standards is not maintained and the versions do not match between base stations, serious problems may occur in various cases such as initial call setup or handover. Thus, DPDCH and DPCCH, which are the core of uplink physical channels, maintain the existing Rel-5 WCDMA standard, while OVSF code and I / Q optimized to minimize PAPR increase for EUDCH-related physical channels. We will present a channel allocation method.

On the other hand, HS-DPCCH also considers the case of slightly violating compatibility to improve the EUDCH data rate. Therefore, the present invention proposes an OVSF code and an I / Q channel allocation method for minimizing PAPR increase of uplink transmission signals in consideration of the following two cases.

First, in the method of allocating OVSF code and I / Q channel with full compatibility with existing Rel-5 WCDMA system, existing uplink channels such as DPCCH, DPDCH, HS-DPCCH, etc. Assume that the OVSF code and I / Q channel assignments are made. In this situation, we propose an optimized OVSF code and I / Q channel allocation method when E-DPCCH and E-DPDCH, which are physical channels for EUDCH packet data transmission, are additionally transmitted.

Second, consider the case where the compatibility for the HS-DPCCH is partially violated while maintaining the compatibility for the existing DPDCH and the DPCCH. In the current Rel-5 WCDMA standard, when the maximum number of DPDCHs that can be transmitted is one, the HS-DPCCH is transmitted using OVSF codes 256 and 64 on the Q channel. In this case, since the E-DPDCH cannot use the OVSF code (4, 1) in the Q channel, the EUDCH maximum data rate is limited.

In order to solve the problem, the code assignment of HS-DPCCH, E-DPCCH, and E-DPDCH in a direction in which the E-DPDCH can use the OVSF code (4,1) in the Q channel and also lower the PAPR of the UE transmission signal Suggest a rule.

In addition, the Rel-6 standard also considers a case of EUDCH stand-alone transmission in which no DPDCH is transmitted in the uplink but only the E-DPDCH. In the present invention, the EUDCH stand-alone transmission is performed. The OVSF code and I / Q channel allocation rule of the HS-DPCCH of the case are presented.

In the method, the I / Q channel and OVSF code allocation of the HS-DPCCH is determined according to the maximum number of DPDCH channels that can be transmitted, and the number of E-DPDCH channels does not affect the allocation rule of the HS-DPCCH. This is because the E-DPDCH is not a channel that is always transmitted but a channel that is transmitted only when data exists in the EUDCH data buffer of the UE. Therefore, it can be said in terms of PAPR that the OVSF code and I / Q channel allocation rules of the HS-DPCCH are determined by considering only the DPDCH according to the current standard.

The contents of the embodiments of the present invention in consideration of the above-described matters can be summarized as follows.

According to the first embodiment, backward compatibility is maintained according to the first method, and only one DPDCH is transmitted.

Existing uplink channels DPCCH, DPDCH, HS-DPCCH, etc. assume that the OVSF code and I / Q channel allocation is made as specified in the current standard. That is, a Node B that does not support EUDCH can demodulate the physical channels normally, and proposes an optimal OVSF code and I / Q channel allocation method for E-DPCCH and E-DPDCH supporting EUDCH.

The second embodiment is a case in which one or more DPDCHs are transmitted while maintaining backward compatibility according to the first method.

Existing uplink channels DPCCH, DPDCH, HS-DPCCH, etc. assume that the OVSF code and I / Q channel allocation is made as specified in the current WCDMA standard. Here, the difference from the first embodiment is that it is also assumed that two or more DPDCHs are transmitted. The I / Q channel and OVSF code allocation of the HS-DPCCH channel is changed according to the maximum number of DPDCH channels that can be transmitted. Accordingly, when the HSDPA service is not performed, the HS-DPCCH channel is not transmitted. Therefore, in consideration of the number of DPDCH channels and transmission of HS-DPCCH channels, we propose an optimal OVSF code and I / Q channel allocation method for E-DPCCH and E-DPDCH that can minimize PAPR.

The third embodiment is a case in which only one DPDCH is transmitted while ignoring compatibility for the HS-DPCCH according to the second method.

Among the existing physical channels, the standard specification for the OVSF code and I / Q channel allocation of the HS-DPCCH is somewhat in violation. In this case, we propose an optimized OVSF code and I / Q channel allocation method for HS-DPCCH as well as E-DPCCH and E-DPDCH. Here, the OVSF code and I / Q channel allocation method for minimizing the PAPR increase can be obtained based on a result of comparing the PAPR of the uplink transmission signal through theoretical analysis and computational experiments for various possible combinations. Each of the above two cases of the PAPR reduction method proposed by the present invention will be described through the following embodiments.

First embodiment

In the following description, a case in which only one DPDCH is transmitted with maximum transmission while maintaining compatibility with the existing Rel-5 standard is described.

The first embodiment describes an OVSF code and an I / Q channel allocation method for E-DPCCH and E-DPDCH, which are dedicated physical channels for EUDCH, while maintaining compatibility with DPCCH, DPDCH, and HS-DPCCH, which are existing physical channels. .

4 is a diagram illustrating a transmitter structure of a user terminal when maintaining compatibility according to the first method of the present invention. First, the respective channels shown in FIG. 4 will be briefly defined.

First, the E-DPCCH is a physical control channel for EUDCH service, and the uplink transmission power, uplink transmission power margin, and channel state information (information necessary for transmitting a buffer state of the UE or estimating uplink channel conditions) Channel State Information: hereinafter referred to as 'CSI'. In addition, the E-DPCCH transmits a packet data transport format identifier (E-TFRI) for an EUDCH service transmitted through the E-DPDCH. The E-DPDCH is a dedicated physical data channel for the EUDCH service and transmits packet data using a data rate determined according to scheduling information notified from the Node B.

In general, DPCCH supports the BPSK modulation scheme, but the E-DPDCH supports not only the BPSK but also QPSK, 8PSK, etc. to increase the data rate while maintaining the number of spreading codes transmitted simultaneously.

1.DPCCH

According to the channel allocation rules of the existing Rel-99 and Rel-5 standards, the DPCCH is assigned a Q channel with an OVSF code (256, 0). Here, (256,0) is the same as OVSF code c _{ch, 256,0} in FIG. That is, in FIG. 4, the DPCCH is BPSK modulated and multiplied by the OVSF code c _{ch, 256,0} to spread the band before transmitting gain Multiplied by _C this _C is a value set by the network according to the speed of data transmitted by the UE or the quality of service requirement. The DPCCH signal is added with other channel signals transmitted through the Q channel and then multiplied by the scrambling code S _{dpch, n} and then transmitted through the antenna through the transmit pulse forming filter and the RF stage.

2. DPDCH

When the SF value of _{DPDCH is} called SF _DPDCH , the _DPDCH is spread by OVSF code (SF _DPDCH , SF _DPDCH / 4) in I channel. In FIG. 4, c _d represents the OVSF code of the DPDCH. In addition, in the present invention, it is assumed that only one DPDCH channel is transmitted when the physical channels related to the EUDCH service are transmitted simultaneously with the DPDCH.

3.HS-DPCCH

It also follows the existing Rel-5 standard and is transmitted only when HSDPA service is provided in downlink. As shown in FIG. 4, when only one DPDCH is transmitted in the uplink, the HS-DPCCH is spread by the Q channel and the OVSF codes 256 and 64.

４.E-DPCCH

When the SF value of the _{E-DPCCH is} called SF _E-DPCCH , it is spread by the I channel and the OVSF code (SF _E-DPCCH , 1). Here, there are many degrees of freedom in allocating an OVSF code and an I / Q channel to the E-DPCCH.In this case, allocating an OVSF code and an I / Q channel of the _E-DPCCH is independent of the SF _E-DPCCH value. It greatly affects the reduction of uplink PAPR. This rule is always applied regardless of whether HS-DPCCH is transmitted or the number of channels of E-DPDCH.

Therefore, the possible values of the SF _E-DPCCH are 8, 16, 32, 64, 128, 128, 256 and the SF _E-DPCCH value to be used is determined in consideration of the amount of information to be transmitted through the E-DPCCH. In FIG. 4, the EUDCH transmission controller 402 transmits control information necessary for receiving the E-DPDCH from the base station through the E-DPCCH. 4, c _{ch, SF, 1} is multiplied by the transmission symbol as the OVSF code of the E-DPCCH to satisfy orthogonality with other physical channels. Transmission gain of E-DPCCH As in the case of other physical channels, the _E-DPCCH is a value set according to the rate of data transmitted from the UE or the quality of service requirement.

5. E-DPDCH

As shown in FIG. 4, two channels of E-DPDCH1 and E-DPDCH2 may be simultaneously transmitted, and the number of E-DPDCH physical channels used depends on the transmission rate of EUDCH packet data. In FIG. 4, the EUDCH transmission control unit 402 determines the number and SF values of the E-DPDCH channels transmitted simultaneously. That is, if the data transmission rate is low, it is spread to an OVSF code having a relatively large SF value and transmitted to one E-DPDCH. If the data rate is high, the SF value is determined to be 4 or 2, and then one or two E Transmit EUDCH packet data through the DPDCH channel. The EUDCH packet transmitter 404 transmits EUDCH transmission data through the E-DPDCH1 under the control of the EUDCH transmission controller 402. Or, if necessary, allocate and transmit up to E-DPDCH2. The EUDCH data buffer 400 is a buffer that stores EUDCH data to be transmitted. In this case, EUDCH data to be transmitted through the E-DPDCH channels is transmitted to an EUDCH packet transmitter 404 under the control of the EUDCH transmission control unit 402.

In the following, various methods for OVSF code and I / Q channel allocation to the E-DPDCH are proposed.

Method A

1) Only one E-DPDCH channel is transmitted

1. When the SF _E-DPDCH of the _E-DPDCH is 4 or more, the EUDCH transmission symbol is transmitted through the Q channel using the OVSF code (SF _E-DPDCH , SF _E-DPDCH / 2). At this time, the usable SF _E-DPDCH is 4, 8, 16, 32, 64, 128, 256. This corresponds to the case where only E-DPDCH1 is transmitted in FIG. 4 and c _ed1 represents an OVSF code used for the E-DPDCH1. When the OVSF code is allocated as described above, the E-DPDCH1 always satisfies the orthogonality with other channels.

2) When two E-DPDCH channels are transmitted

Here, the E-DPDCH channel can be described in the following two cases according to the data rate of the EUDCH.

1. If the SF _E-DPDCH of E-DPDCH1 and E-DPDCH2 is 4, E-DPDCH2 and E-DPDCH1 are spread over I and Q channels as OVSF codes (4, 2) and transmitted simultaneously. In FIG. 4, E-DPDCH2 is assigned to I channel and E-DPDCH1 is assigned to Q channel. In this case, EUDCH packet data is transmitted in a fourth order or higher modulation scheme such as QPSK, 8PSK, and 16QAM. For example, when QPSK modulation is applied, symbols transmitted through E-DPDCH1 and E-DPDCH2 are ( One, Four possible combinations of 1), and if 8PSK is applied ( , 0), (0, ), ( One, The eight possible combinations of 1) will be transmitted.

In this case, even if two channels of E-DPDCH1 and E-DPDCH2 are simultaneously transmitted by setting the SF _E-DPDCH to 4, if the desired EUDCH data rate cannot be achieved, the SF _{E-DPDCH is set} to 2 as shown below. Enable transmission at rate.

2. E-DPDCH1 are spread with the OVSF code (2, 1) E-DPDCH2 for the SF _E-DPDCH is 2 E-DPDCH2 and the E-DPDCH1 in the I and Q channels respectively, and transmitted at the same time. In this case, the EUDCH packet data can be transmitted in a fourth or higher modulation scheme such as QPSK, 8PSK, 16QAM, or the like.

In it is possible to use the above-described method to A Similar to E-DPDCH1 only the SF _E-DPDCH unlike the case of the method A limit the SF _E-DPDCH in the case where transmission at a minimum to 42 below.

Method B

1) Only one E-DPDCH channel is transmitted

1. SF _E-DPDCH is 2, 4, 8, 16, 32, 64, 128, 256 when only E-DPDCH1 is transmitted. OVSF code (SF _E-DPDCH , SF _E-DPDCH / 2) is assigned to the Q channel.

2) When two E-DPDCH channels are transmitted

1. E-DPDCH2 and E-DPDCH1 are spread over OVSF codes (2, 1) in I and Q channels, respectively, and transmitted simultaneously. In this case, EUDCH packet data can be transmitted by a fourth order modulation method such as QPSK, 8PSK, 16QAM, or the like.

Method C is similar to Method A, except that SF of E-DPDCH1 is 2, so that 4 may be applied as an SF value to E-DPDCH2.

Method C

1) Only one E-DPDCH channel is transmitted

1. When the SF _E-DPDCH of the _E-DPDCH is 4 or more, the EUDCH transmission symbol is transmitted through the Q channel using the OVSF code (SF _E-DPDCH , SF _E-DPDCH / 2). At this time, the usable SF _E-DPDCH is 4, 8, 16, 32, 64, 128, 256. This corresponds to the case where only E-DPDCH1 is transmitted in FIG. 4 and c _ed1 represents an OVSF code used for the E-DPDCH1. When the OVSF code is allocated as described above, the E-DPDCH1 always satisfies the orthogonality with other channels.

2) When two E-DPDCH channels are transmitted

1. When SF of E-DPDCH1 and E-DPDCH2 is 4, the same method as in the case where only one E-DPDCH channel of 1 is transmitted is applied.

The only difference is that when the two channels of E-DPDCH1 and E-DPDCH2 cannot be achieved at the same time with SF _E-DPDCH as 4, EUDCH packet data is transmitted in the following 2 ways.

2. E-DPDCH1 is SF _E-DPDCH is 2 and E-DPDCH2 is SF _E-DPDCH is 4.

Since the SF _E-DPDCH of the E-DPDCH1 and the E-DPDCH2 are different values, BPSK modulation is applied to the data carried on each channel independently. Accordingly, the symbols transmitted in the E-DPDCH1 and the E-DPDCH2 are spread and transmitted to the OVSF codes (2, 1) and (4, 2) in the I and Q channels, respectively.

3. SF _E-DPDCH of E-DPDCH1 and E-DPDCH2 is 2

The E-DPDCH2 and E-DPDCH1 are spread on the OVSF codes (2, 1) in the I and Q channels, respectively, and transmitted simultaneously. In this case, the EUDCH packet data can be transmitted in a fourth or higher modulation scheme such as QPSK, 8PSK, 16QAM, or the like.

On the other hand, in the above methods A, B and C, the OVSF codes (4, 1) are not used for the transmission of the E-DPDCH in consideration of the transmission of the DPDCH and the HS-DPCCH. However, the HS-DPCCH is transmitted only during the HSDPA service. In the case of DPDCH, when there is no data to be transmitted through the DPDCH, the HS-DPCCH may be used only occasionally for signaling information and may not be transmitted at other times. In addition, in the WCDMA standard specification after Rel-5, there may be a case where only the E-DPDCH is set without the DPDCH being set.

In consideration of the above situation, in the following method D, when the DPDCH and the HS-DPCCH are not transmitted or the HS-DPCCH is transmitted, when the OVSF code generated from the OVSF code (4, 0) is used, the EUDCH packet data rate is set. In order to increase, it is proposed to use the OVSF code (4, 1) for the transmission of additional E-DPDCH.

Method D

1) When two or less E-DPDCH channels are transmitted

Application of the above-described method A, method B, or method C is possible.

2) When three E-DPDCH channels are transmitted

1. If the HS-DPCCH is not transmitted, the third E-DPDCH channel is transmitted using the OVSF code (4, 1) on the Q channel.

2. When the HS-DPCCH is transmitted and the DPDCH is not transmitted, the third E-DPDCH channel is transmitted using the OVSF codes (4, 1) on the I channel.

3) When four or more E-DPDCH channels are transmitted

This applies when the OVSF codes (4, 1) are not used by DPDCH and HS-DPCCH in both I and Q channels.

1. If neither HS-DPCCH and DPDCH are transmitted, transmit the third and fourth E-DPDCH channels using OVSF codes (4, 1) on the I and Q channels, respectively. And, even if the DPDCH is not set and the HS-DPCCH is transmitted using the OVSF code generated from the OVSF code (4, 0), the OVSF code (4, 1) is not used in the I and Q channels at all. 4, 1) can be used to transmit the third and fourth E-DPDCH channels on the I / Q channel.

In the following method E, an E-DPDCH code allocation rule is applied differently by distinguishing between a case where HS-DPCCH is configured and a case where the HS-DPCCH is not. The reason is that it is possible to use the OVSF codes (4, 1) in the Q channel if the HS-DPCCH is not set, but if the HS-DPCCH is set with one DPDCH, the HS-DPCCH is the OVSF code in the Q channel. This is because it is difficult to use the OVSF codes (4, 1) for the E-DPDCH in the Q channel because (256, 64) is used.

Method E

1) HS-DPCCH or DPDCH is not set

1. One E-DPDCH transmission

OVSF code (SF _E-DPDCH , SF _E-DPDCH / 4) is used in Q channel, and SF _E-DPDCH has 4, 8, 16, 32, 64, 128, 256, 512, etc. In addition, if sufficient EUDCH data rate cannot be achieved using SF = 4, OVSF codes (2, 1) are used in the Q channel instead of OVSF codes (SF _E-DPDCH , SF _E-DPDCH / 4).

2. Two E-DPDCH Transmissions

When two E-DPDCHs are transmitted as described above, the following two methods are applicable.

2.1

In addition to the E-DPDCH1 transmitted in the OVSF code (2, 1) in the Q channel, the E-DPDCH2 is transmitted using the OVSF code (2, 1) in the I channel.

2.2

In addition to E-DPDCH1 transmitted in the OVSF code (2, 1) on the Q channel, E-DPDCH2 is transmitted using the OVSF code (4, 2) in the I channel. And, even if the E-DPDCH channels are not used to achieve the desired EUDCH data rate, the E-DPDCH2 uses (2, 1) instead of the OVSF code (4, 2).

3. Three E-DPDCH Transmissions

In addition to E-DPDCH1 and E-DPDCH2 transmitted using OVSF codes (2, 1) in the Q and I channels, E-DPDCH3 is transmitted using OVSF (4, 1) in the Q channel.

4. Four E-DPDCH Transmissions

This is the case when the OVSF codes (4, 1) are not used by the DPDCH and the HS-DPCCH in both the I and Q channels.

E-DPDCH1, E-DPDCH2, E in TTI (Transmission Time Interval) in which DPDCH is not transmitted when DPDCH is not set or when DPDCH is set to the same radio frame length even if DPDCH is set. In addition to the DPDCH3 channels, the E-DPDCH4 is transmitted using the OVSF code (4, 1) on the I channel. On the other hand, when the "3. three E-DPDCH transmission case" is excluded, E-DPDCH3 and E-DPDCH4 using OVSF codes (4, 1) on both I and Q channels in addition to E-DPDCH1 and E-DPDCH2. Additionally transmits.

2) When HS-DPCCH is set to (Q, 256, 64)

1. One E-DPDCH transmission

(SF _E-DPDCH , SF _E-DPDCH / 2) are used in the Q channel, and SF _E-DPDCH is available in 2, 4, 8, 16, 32, 64, 128, 256, and 512.

2. Two E-DPDCH Transmissions

1) The same method as 2 in the case where HS-DPCCH is not set is applied.

3. Three E-DPDCH Transmissions

Transmitted using OVSF codes (2, 1) on I and Q channels in TTI where DPDCH is not transmitted on I channel when DPDCH is not set or when DPDCH and E-DPDCH have the same frame length even if DPDCH is set In addition to E-DPDCH1 and E-DPDCH2, E-DPDCH3 is transmitted using OVSF (4, 1) on the Q channel.

In the following method F, the OVSF code and the I / Q channel allocation method are the same when the HS-DPCCH is not set compared to the method E, but when the HS-DPCCH is set, a different allocation method is proposed. . Thus, the method F has the advantage of lowering the PAPR when the HS-DPCCH is set in the cases where the DPDCH is not set or the frame lengths of the E-DPDCH and the DPDCH are the same and can efficiently use the OVSF code.

Method F

1) When HS-DPCCH is not set

1) The same allocation rule as in the case of 1) HS-DPCCH or DPDCH of the above method E is not applied.

2) When HS-DPCCH is set

1. One E-DPDCH transmission

The I / Q channel and OVSF code used for the E-DPDCH vary depending on whether the DPDCH is currently transmitted in the TTI. First, if DPDCH is transmitted in the current TTI, (SF _E-DPDCH , SF _E-DPDCH / 2) is used in the Q channel, and SF _E-DPDCH is 2, 4, 8, 16, 32, 64, 128, 256. , 512 and so on.

On the other hand, if DPDCH is not currently transmitted in TTI, OVSF code (SF _E-DPDCH , SF _E-DPDCH / 4) is used in I channel, and SF _E-DPDCH is 4, 8, 16, 32, 64, 128 , 256, 512 and so on. In this case, if it is necessary to further increase the EUDCH data rate, the E-DPDCH is transmitted using (2, 1) instead of the OVSF codes (SF _E-DPDCH , SF _E-DPDCH / 4).

2. Two E-DPDCH Transmissions

The same method applies to the case where two E-DPDCHs are transmitted in the method E.

3. Three E-DPDCH Transmissions

In addition to E-DPDCH1 and E-DPDCH2 transmitted using the OVSF codes (2, 1) on the Q and I channels, the OVSF code (4, 1) is used on the I channel if no DPDCH is currently transmitted on the TTI. Transmit the E-DPDCH.

Method G

Method G, which will be described below, is the same as the OVSF code and I / Q channel allocation method when HS-DPCCH or DPDCH is not set compared to Method E, but HS-DPCCH is the OVSF code (256, 64) in the Q channel. If it is set to, it is possible to lower the PAPR by allocating the E-DPDCH from the I channel.

1) HS-DPCCH or DPDCH is not set

The same allocation rule as in " 1) HS-DPCCH or DPDCH is not set "

2) When HS-DPCCH is set to (Q, 256, 64)

1. One E-DPDCH transmission

The OVSF code (SF _E-DPDCH , SF _{E-DPDCH /} 2) is used in the I channel, and the SF _E-DPDCH has values of 2, 4, 8, 16, 32, 64, 128, 256, and 512.

2. Two E-DPDCH Transmissions

E-DPDCH2 is transmitted using the OVSF code (2, 1) on the Q channel along with E-DPDCH1 transmitted on the OVSF code (2, 1) on the I channel.

Referring to FIG. 4, an EUDCH transmission controller 402 transmits a data buffer state, CSI, etc. of a UE necessary for the Node B control scheduling to the Node B through the E-DPCCH. The EUDCH transmission control unit 402 determines the E-TFRI, and transmits the determined E-TFRI to the Node B through the E-DPCCH. The packet data transmission format is determined using the maximum data rate that can be transmitted.

The EUDCH packet transmitter 404 receives the packet data determined by the transmission format of the transferred EUDCH packet data from the EUDCH data buffer 400. The received packet data is transmitted to the Node B through the E-DPDCH 1 and E-DPDCH 2 channels after performing channel coding and modulation using the EUDCH packet data transmission format.

The data of the DPDCH is spread at the chip rate using the OVSF code c _d in the multiplier 422 and the channel gain in the multiplier 424. multiplied by _d Channel gain The data of the DPDCH multiplied by _d is input to summer 426.

The control information of the _E-DPCCH is spread at a chip rate using the OVSF code c _{ch, SF, 1,} that is, (SF _E-DPCCH , 1) in order to maintain orthogonality with other physical channels in the multiplier 406. Channel gain at 408 multiplied by _ec Channel gain Control information of the E-DPCCH multiplied by _ec is input to the summer 426.

The packet data transferred from the EUDCH packet transmitter 404 is converted into a complex symbol stream of I + jQ, and then the I / Q channel components are transferred to the multiplier 446 and the multiplier 416, respectively. The multiplier 446 spreads the I channel component of the modulation symbol at chip rate by the OVSF code C _ed2 . The output of multiplier 446 is channel gained at multiplier 448. multiplied by _ed2 The summer 426 adds the input data of the DPDCH, the control information of the E-DPCCH, and the E-DPDCH2 to form an I channel.

The control information of the DPCCH is spread at the chip rate using the OVSF codes 256 and 0, that is, c _ch, 256 and 0, in the multiplier 428, and channel gain in the multiplier 430. multiplied by _c Channel gain The control information of the DPCCH multiplied by _c is input to a summer 436.

The control information of the HS-DPCCH is spread at the chip rate using the OVSF codes 256 and 64, that is, c _ch, 256 and 64 in the multiplier 432, and the channel gain in the multiplier 434. multiplied by _hs

In addition, the Q channel component of the EUDCH packet data modulation symbol transmitted from the EUDCH packet transmitter 404 is spread at the chip rate by the OVSF code C _ed1 in the multiplier 416. The output of the multiplier 416 is channel gain at multiplier 418 multiplied by _ed1 The summer 436 combines the input control information of the DPCCH, the control information of the HS-DPCCH, and the data of the E-DPDCH1 to form a Q channel. The output of summer 436 is multiplied by imaginary number in multiplier 438 and then passed to summer 440.

The summer 440 receives the output of the summer 426 to form a summed complex symbol string, and then transfers the complex symbol string to the multiplier 450. The multiplier 450 scrambles the transmitted complex symbol string using a scrambling code S _{dpch, 1} . The scrambled complex symbol string is converted into pulse form by the pulse generator 452 and then transmitted to the Node B through the antenna 456 via the RF 454.

FIG. 5 is a diagram illustrating a comparison of the PAPR reduction effect according to FIG. 4 with respect to a physical channel configuration example. FIG.

In FIG. 5, 40 is a case where the method proposed by the present invention is applied, and 41 and 42 are cases where another OVSF code assignment or another I / Q channel assignment is applied to the E-DPCCH. Here, the PAPR result is obtained through computational experiments by applying the transmission pulse generator 452 and the scrambling code shown in the Rel-5 WCDMA standard, and apply the channel gain. Value setting is commonly applied when discussing EUDCH techniques.

Referring to FIG. 5, first, 40 proposed by the present invention has a PAPR reduction effect of about 0.7 dB compared to 41. In addition, 40 proposed in the present invention has a PAPR reduction effect of about 0.12 dB compared to 42.

By applying the OVSF code and I / Q channel allocation method of the E-DPCCH and E-DPDCH proposed in the present invention, a relatively small PAPR can be achieved in many cases.

Second embodiment

The following describes the OVSF code and the I / Q channel allocation method of the E-DPCCH and the E-DPDCH for the case where one or more DPDCHs are transmitted while maintaining compatibility with the existing Rel-5 standard.

Method A

1) One or more DPDCHs can be transmitted and the HS-DPCCH is not transmitted.

The allocation of I / Q channel and OVSF codes of DPCCH and DPDCH according to the current standard is shown in Table 1 below.

That is, the DPCCH channel is transmitted using the OVSF code (256,0) in the Q channel, and the DPDCH can be allocated to the I channel with the OVSF code (SF _DPDCH , SF _DPDCH / 4). That is, the SF values are 4, 8, 16, 32, 64, 128, 256, and 512.

In consideration of compatibility with the current standard of Table 1, the I / Q channel and OVSF codes of the E-DPCCH and the E-DPDCH are allocated in the present invention as shown in Table 2 below.

The SF _E-DPCCH of the _E-DPCCH may be 8, 16, 32, 64, 128, 256, etc., and the SF _E-DPDCH of the _E-DPDCH is 4, 8, 16, 32, 64, 128, 256, 512. Such values are possible.

As shown in Table 2, a maximum of five E-DPDCH channels can be transmitted, and if E-DPDCH2 cannot be achieved by applying SF = 4 to E-DPDCH1, E-DPDCH2 is additionally transmitted. In this case, E-DPDCH1 and E-DPDCH2 are assigned to (Q, 4,1) and (I, 4,3), respectively. If the two E-DPDCH channels are not enough, E-DPDCH3, E-DPDCH4, and E-DPDCH5 channels may be additionally transmitted according to the EUDCH data rate.

That is, the E-DPDCH1 is transmitted using the OVSF code (4, 1) in the Q channel, and the E-DPDCH2 is transmitted in the OVSF code (4, 3) in the I channel. In addition, the E-DPDCH3 is transmitted using the OVSF codes (4, 3) in the Q channel, and the E-DPDCH4 is transmitted using the OVSF codes (4, 2) in the I channel. Finally, the E-DPDCH5 is transmitted using the OVSF code (4, 2) on the Q channel.

2) When one or more DPDCHs can be transmitted and the HS-DPCCH is transmitted

The I / Q channel and OVSF codes of DPCCH, DPDCH, and HS-DPCCH according to the current standard are allocated as shown in Table 3 below.

That is, the DPCCH channel is transmitted using the OVSF code (256,0) in the Q channel, and the DPDCH can be allocated to the I channel with the OVSF code (SF _DPDCH , SF _DPDCH / 4). The HS- DPCCH channel is transmitted using OVSF codes (256, 64) on the Q channel.

In consideration of compatibility with the current standard of Table 3, the I / Q channel and OVSF codes of the E-DPCCH and the E-DPDCH are allocated in the present invention as shown in Table 4 below.

The SF _E-DPCCH of the _E-DPCCH may be 8, 16, 32, 64, 128, 256, etc., and the SF _E-DPDCH of the _E-DPDCH is 4, 8, 16, 32, 64, 128, 256, 512. Such values are possible. At this time, up to four E-DPDCH channels can be transmitted, and if E-DPDCH2 cannot be achieved by applying SF = 4 to E-DPDCH1, E-DPDCH2 is additionally transmitted. In this case, E-DPDCH1 and E-DPDCH2 are assigned to (Q, 4,3) and (I, 4,3), respectively. E-DPDCH3 is transmitted using the OVSF code (4,2) on the Q channel, and E-DPDCH4 is transmitted using the OVSF code (4,2) on the I channel.

3) Up to 2 DPDCHs can be transmitted and HS-DPCCH is not transmitted

The allocation of I / Q channel and OVSF codes of DPCCH and DPDCH according to the current standard is shown in Table 5 below.

That is, the DPCCH channel is transmitted using the OVSF code (256,0) on the Q channel, DPDCH1 can be assigned to the I channel with the OVSF code (SF _DPDCH , SF _DPDCH / 4), and DPDCH2 is the OVSF code (4, 1). Can be assigned to the Q channel.

In consideration of compatibility with the current standard of Table 5, the I / Q channel and OVSF codes of the E-DPCCH and the E-DPDCH are allocated in the present invention as shown in Table 6 below.

The SF _E-DPCCH of the _E-DPCCH may be 8, 16, 32, 64, 128, 256, etc., and the SF _E-DPDCH of the _E-DPDCH is 4, 8, 16, 32, 64, 128, 256, 512. Such values are possible. At this time, up to four E-DPDCH channels can be transmitted, which are transmitted in the order listed in Table 6 according to the data rate of the EUDCH. For example, when SF = 4, E-DPDCH1 and E-DPDCH2 are transmitted using (Q, 4,3) and (I, 4,3), respectively. E-DPDCH3 is transmitted using the OVSF code (4,2) on the Q channel, and E-DPDCH4 is transmitted using the OVSF code (4,2) on the I channel.

4) Up to 2 DPDCHs can be transmitted and HS-DPCCH is transmitted

The I / Q channel and OVSF codes of DPCCH, DPDCH, and HS-DPCCH according to the current standard are allocated as shown in Table 7 below.

That is, the DPCCH channel is transmitted using the OVSF code (256,0) in the Q channel, and the DPDCH can be allocated to the I channel with the OVSF code (SF _DPDCH , SF _DPDCH / 4). The HS-DPCCH channel is transmitted using OVSF codes (256, 64) on the Q channel.

In consideration of compatibility with the current standard of Table 7, the I / Q channel and OVSF codes of the E-DPCCH and the E-DPDCH are allocated in the present invention as shown in Table 8 below.

The SF _E-DPCCH of the _E-DPCCH may be 64, 128, 256, and the like, and the SF _E-DPDCH of the _E-DPDCH may have a value of 4, 8, 16, 32, 64, 128, 256, 512, and the like. . At this time, up to four E-DPDCH channels can be transmitted, which are transmitted in the order listed in Table 8 according to the data rate of the EUDCH. For example, when SF = 4, E-DPDCH1 and E-DPDCH2 are allocated to (I, 4, 3) and (Q, 4, 3), respectively. E-DPDCH3 is transmitted using the OVSF code (4, 2) on the I channel, and E-DPDCH4 is transmitted using the OVSF code (4, 2) on the Q channel.

5) Up to 3 DPDCHs can be transmitted and HS-DPCCH is not transmitted

The allocation of I / Q channel and OVSF codes of DPCCH and DPDCH according to the current standard is shown in Table 9 below.

That is, the DPCCH channel is transmitted using the OVSF code (256,0) on the Q channel, DPDCH1 is transmitted using the OVSF code (4,1) on the I channel, and the DPDCH2 is the OVSF code (4,1) on the Q channel. Is transmitted using). DPDCH3 can be assigned to an I channel with an OVSF code (4, 3).

In consideration of compatibility with the current standard of Table 9, the I / Q channel and OVSF codes of the E-DPCCH and the E-DPDCH are allocated in the present invention as shown in Table 10 below.

The SF _E-DPCCH of the _E-DPCCH may be 8, 16, 32, 64, 128, 256, etc., and the SF _E-DPDCH of the _E-DPDCH is 4, 8, 16, 32, 64, 128, 256, 512. Such values are possible. At this time, up to three E-DPDCH channels can be transmitted, which are transmitted in the order listed in Table 10 according to the data rate of the EUDCH. For example, when applying SF = 4, the E-DPDCH1 is transmitted using the OVSF codes (4, 3) in the Q channel. E-DPDCH2 is transmitted using the OVSF code (4, 2) on the I channel, and E-DPDCH3 is transmitted using the OVSF code (4, 2) on the Q channel.

6) Up to 3 DPDCHs can be transmitted and HS-DPCCH is transmitted

The I / Q channel and OVSF codes of DPCCH, DPDCH, and HS-DPCCH according to the current standard are allocated as shown in Table 11 below.

That is, the DPCCH channel is transmitted using the OVSF code (256,0) on the Q channel, DPDCH1 is transmitted using the OVSF code (4,1) on the I channel, and the DPDCH2 is the OVSF code (4,1) on the Q channel. Is transmitted using). DPDCH3 can be assigned to an I channel with an OVSF code (4, 3). The HS-DPCCH channel is transmitted using OVSF codes (256, 32) on the Q channel.

In consideration of compatibility with the current standard of Table 11, the I / Q channel and OVSF codes of the E-DPCCH and the E-DPDCH are allocated in the present invention as shown in Table 12 below.

The SF _E-DPCCH of the _E-DPCCH may be 8, 16, 32, 64, 128, 256, etc., and the SF _E-DPDCH of the _E-DPDCH is 4, 8, 16, 32, 64, 128, 256, 512. Such values are possible. At this time, up to three E-DPDCH channels can be transmitted, which are transmitted in the order listed in Table 12 according to the data rate of the EUDCH. For example, when applying SF = 4, the E-DPDCH1 is transmitted using the OVSF codes (4, 3) in the Q channel. E-DPDCH2 is transmitted using the OVSF code (4, 2) on the I channel, and E-DPDCH3 is transmitted using the OVSF code (4, 2) on the Q channel.

7) Up to 4 DPDCHs can be transmitted and HS-DPCCH is not transmitted

The allocation of I / Q channel and OVSF codes of DPCCH and DPDCH according to the current standard is shown in Table 13 below.

That is, the DPCCH channel is transmitted using the OVSF code (256,0) on the Q channel, DPDCH1 is transmitted using the OVSF code (4,1) on the I channel, and the DPDCH2 is the OVSF code (4,1) on the Q channel. Is transmitted using). DPDCH3 is transmitted using the OVSF codes (4, 3) on the I channel, and DPDCH4 is transmitted using the OVSF codes (4, 3) on the Q channel.

In consideration of compatibility with the current standard of Table 13, the I / Q channel and OVSF codes of the E-DPCCH and the E-DPDCH are allocated in the present invention as shown in Table 14 below.

The SF _E-DPCCH of the _E-DPCCH may be 8, 16, 32, 64, 128, 256, etc., and the SF _E-DPDCH of the _E-DPDCH is 4, 8, 16, 32, 64, 128, 256, 512. Such values are possible. At this time, up to two E-DPDCH channels can be transmitted, which are transmitted in the order listed in Table 12 according to the data rate of the EUDCH. For example, in case of applying SF = 4, E-DPDCH1 is transmitted using OVSF code (4,2) in I channel, and E-DPDCH2 is transmitted using OVSF code (4,2) in Q channel. do.

8) Up to 4 DPDCHs can be transmitted and HS-DPCCH is transmitted

The I / Q channel and OVSF codes of the DPCCH and DPDCH according to the current standard are allocated as shown in Table 15 below.

That is, the DPCCH channel is transmitted using the OVSF code (256,0) on the Q channel, DPDCH1 is transmitted using the OVSF code (4,1) on the I channel, and the DPDCH2 is the OVSF code (4,1) on the Q channel. Is transmitted using). DPDCH3 is transmitted using the OVSF codes (4, 3) on the I channel, and DPDCH4 is transmitted using the OVSF codes (4, 3) on the Q channel. The HS-DPCCH channel is transmitted using the OVSF code (256, 1) on the Q channel.

In consideration of compatibility with the current standard of Table 15, the I / Q channel and OVSF codes of the E-DPCCH and the E-DPDCH are allocated in the present invention as shown in Table 16 below.

The SF _E-DPCCH of the _E-DPCCH may be 64, 128, 256, etc., and the SF _E-DPDCH of the _E-DPDCH may have a value of 4, 8, 16, 32, 64, 128, 256, 512, and the like. . At this time, up to two E-DPDCH channels can be transmitted, which are transmitted in the order listed in Table 16 according to the data rate of the EUDCH. For example, in case of applying SF = 4, E-DPDCH1 is transmitted using OVSF code (4,2) in I channel, and E-DPDCH2 is transmitted using OVSF code (4,2) in Q channel. .

9) Up to 5 DPDCHs can be transmitted and HS-DPCCH is not transmitted

The allocation of I / Q channel and OVSF codes of DPCCH and DPDCH according to the current standard is shown in Table 17 below.

That is, the DPCCH channel is transmitted using the OVSF code (256,0) on the Q channel, DPDCH1 is transmitted using the OVSF code (4,1) on the I channel, and the DPDCH2 is the OVSF code (4,1) on the Q channel. Is transmitted using). DPDCH3 is transmitted using the OVSF codes (4, 3) on the I channel, and DPDCH4 is transmitted using the OVSF codes (4, 3) on the Q channel. DPDCH5 is transmitted on the I channel using the OVSF code (4, 2).

In consideration of compatibility with the current standard of Table 17, the I / Q channel and OVSF codes of the E-DPCCH and the E-DPDCH are allocated in the present invention as shown in Table 18 below.

The SF _E-DPCCH of the _E-DPCCH may be 8, 16, 32, 64, 128, 256, etc., and the SF _E-DPDCH of the _E-DPDCH is 8, 16, 32, 64, 128, 256, 512, etc. The value is possible. At most one E-DPDCH can be transmitted. The E-DPDCH1 is transmitted using the OVSF code (4, 2) in the Q channel.

10) Up to 5 DPDCHs can be transmitted and HS-DPCCH is transmitted

The allocation of I / Q channel and OVSF codes of DPCCH and DPDCH according to the current standard is shown in Table 19 below.

That is, the DPCCH channel is transmitted using the OVSF code (256,0) on the Q channel, DPDCH1 is transmitted using the OVSF code (4,1) on the I channel, and the DPDCH2 is the OVSF code (4,1) on the Q channel. Is transmitted using). DPDCH3 is transmitted using the OVSF codes (4, 3) on the I channel, and DPDCH4 is transmitted using the OVSF codes (4, 3) on the Q channel. DPDCH5 is transmitted on the I channel using the OVSF code (4, 2).

In consideration of compatibility with the current standard of Table 197, the I / Q channel and OVSF codes of the E-DPCCH and the E-DPDCH are allocated in the present invention as shown in Table 20 below.

In the above, the SF _E-DPCCH of the _E-DPCCH may be 8, 16, 32, 64, 128, 256, etc., and only one E-DPDCH may be transmitted. The E-DPDCH1 is transmitted using the OVSF code (4, 2) in the Q channel.

Method B

In the following, the power backoff required in the RF power amplifier compared to the method A is similar, but a simpler allocation rule is proposed.

That is, in Method B below, I / Q channel and OVSF code allocation of E-DPCCH and E-DPDCH is determined by the maximum number of DPDCHs that can be transmitted and whether HS-DPCCH is transmitted and the basic rules are as follows.

E-DPCCH: If the maximum number of DPDCHs that can be transmitted is 2 or 4, the HS-DPCCH is allocated to (I, 256, 1), and only in this case, the E-DPCCH is (Q, SF _{E_DPCCH} , SF _{E_DPCCH} / 8). If not, always use (I, SF _{E_DPCCH} , 1).

E-DPDCH: (I, 4, 1), (Q, 4, 1), (I, 4, 3), (Q, 4, 3), (I) depending on the data rate when multiple DPDCH channels are transmitted , OVSF codes such as 4, 2) and (Q, 4, 2) are used in the order listed above. Accordingly, the E-DPDCH additionally uses the remaining codes other than those set for DPDCH transmission among the six codes in the order listed above according to the EUDCH packet data rate.

HSDPA uses OVSF codes (256, 1) in the I channel in case of stand-alone transmission in which only EUDCH is transmitted, and follows the Rel-5 standard when DPDCH is set. As described above, OVSF code allocation is optimal in terms of PAPR.

Hereinafter, OVSF codes and I / Q channel allocation methods of E-DPCCH and E-DPDCH will be described for three cases according to the HS-DPCCH and DPDCH setting conditions.

1) When HS-DPCCH is not set and EUDCH independent transmission

1. E-DPCCH always uses (I, SF _{E_DPCCH} , 1). In this case, SF _{E_DPCCH} may have a _value of 8, 16, 32, 64, 128, and 256.

2. The E-DPDCH is allocated an I / Q channel and an OVSF code according to the maximum number of DPDCHs that can be transmitted as shown in Table 21 below.

In Table 21, SF may be 4, 8, 16, 32, 64, 128, 256, 512 and the like. In the stand-alone transmission of only EUDCH in Table 21, the maximum number of DPDCHs that can be transmitted is 0, and up to six codes may be used for an E-DPDCH channel for transmitting EUDCH data. That is, a maximum of six E-DPDCH channels can be transmitted. In this case, if a sufficient EUDCH data rate can be achieved by applying SF of 4 or less to the E-DPDCH channel, the E-DPDCH1 has an OVSF code (SF, SF / 4).

In addition, when data is transmitted using the one E-DPDCH channel, if the EUDCH data rate cannot be sufficiently achieved, the OVSF codes are additionally used in the order listed in Table 21 according to the data rate of the EUDCH. Send E-DPDCH channels.

For example, when six channels are used according to the data rate of the EUDCH, the E-DPDCH1 is transmitted using the OVSF code (4,1) in the channel, and the E-DPDCH2 is the OVSF code (4, Send it using 1). In addition, E-DPDCH3 transmits using OVSF codes (4,3) on I channel, E-DPDCH4 uses OVSF codes (4,3) on Q channel, and E-DPDCH5 uses OVSF code (I) on I channel. 4,2) to transmit. In addition, the E-DPDCH6 may be additionally allocated to transmit using the OVSF code (4, 2) in the Q channel.

As another example, when the maximum number of DPDCHs that can be transmitted in Table 21 is 4, up to two codes may be used for the E-DPDCH for transmitting EUDCH data. For the E-DPDCH, E-DPDCH1 transmits using OVSF codes (SF, SF / 2) in I channel, and additionally allocated E-DPDCH2 transmits using OVSF codes (4, 2) in Q channel. Do it.

2) Up to 1 DPDCH can be transmitted and HS-DPCCH is set to (Q, 256, 64)

1. E-DPCCH always uses (I, SF _{E_DPCCH} , 1). In this case, SF _{E_DPCCH} may have a _value of 8, 16, 32, 64, 128, and 256.

2.E-DPDCH uses four OVSF codes (I, SF, SF / 2 + SF / 4), (Q, 4, 3), (I, 4, 2), and (Q, 4, 2) for EUDCH data. Additional allocations will be made in order by rate. In this case, SF may be 4,8,16,32,64,128,256,512. Here, the OVSF codes (4, 1) in the Q channel are difficult to use for the E-DPDCH since the HS-DPCCH is assigned to (Q, 256, 64).

3) When two or more DPDCHs can be transmitted and HS-DPCCH is also set

1. The E-DPCCH is allocated an I / Q channel and an OVSF code according to the maximum number of DPDCHs that can be transmitted as shown in Table 22 below.

At this time, when the number of maximum transmittable DPDCH is 2 or 4, if the HS-DPCCH is (I, 256, 1), the E-DPCCH uses (Q, SF _{E_DPCCH} , SF _{E_DPCCH} / 8). In this case, the SF may be a value of 64, 128, 256.

2. The E-DPDCH is allocated an I / Q channel and an OVSF code as shown in Table 21 according to the maximum number of DPDCHs that can be transmitted.

Method C

Hereinafter, a method of using a code allocation rule as in the above-described method B but lowering the PAPR compared to the method B is proposed.

In the following method C, the I / Q channel and OVSF code allocation of the E-DPDCH is determined by the number of maximum transmittable DPDCHs and the presence or absence of transmission of the HS-DPCCH, as in the method B. In this case, as a difference from the method B, in the method C, the order of I / Q channel assignment is changed so that the E-DPDCH is assigned to the Q channel first for the OVSF code of the same index, and then to the I channel.

As an advantage of this method C, the DPDCH is allocated from the I channel and the E-DPDCH is allocated from the Q channel so that the number of DPDCH and E-DPDCH transmitted in the I / Q channel can be equalized. Therefore, when the HS-DPCCH transmits using the OVSF code (256, 64) on the Q channel or when the DPDCH is transmitted less than the maximum number of transmissions, the DPDCH and the E-DPDCH are biased on the I channel so that the PAPR becomes excessively large. Can be prevented.

On the other hand, when the above-described OVSF code and I / Q channel allocation rules of the E-DPDCH are applied, the E-DPCCH corresponds to the DPCCH using the OVSF code (256, 0) in the Q channel. ) To minimize PAPR increase. SF may be 4, 8, 16, 32, 64, 128, and the like. HSDPA uses OVSF codes (256, 1) in I channel for EUDCH stand-alone and follows Rel-5 standard when DPDCH is set. As described above, OVSF code allocation is optimal in terms of PAPR.

Hereinafter, the OVSF code and the I / Q channel allocation method of the E-DPDCH will be described in detail for three cases according to the setting conditions of the HS-DPCCH and the DPDCH.

1) When HS-DPCCH is not set and EUDCH stand-alone

The E-DPDCH is allocated an I / Q channel and an OVSF code as shown in Table 23 below according to the maximum number of DPDCHs that can be transmitted.

In Table 23, SF may be 4, 8, 16, 32, 64, 128, 256, 512, and the like. In Table 23, when the maximum number of DPDCHs that can be transmitted is 0, up to six E-DPDCH channels may be transmitted. In this case, according to the number of E-DPDCH channels transmitted, the OVSF codes are (Q, SF, SF / 4), (I, 4, 1), (Q, 4, 3), (I, 4, 3), Used in the order (Q, 4, 2), (I, 4, 2).

When the maximum number of DPDCHs that can be transmitted is 1, since up to five codes can be used for the E-DPDCH channel for transmitting EUDCH data, up to five E-DPDCH channels can be transmitted. In this case, depending on the number of E-DPDCH channels transmitted, the OVSF codes are (Q, SF, SF / 4), (Q, 4, 3), (I, 4, 3), (Q, 4, 2), ( Used in the order of I, 4, 2).

In this regard, the difference between the method C shown in Table 23 and the method B shown in Table 21 is that when two or more E-DPDCHs are transmitted, the same OVSF code is used first in the Q channel, It depends on whether it is used later.

Referring back to Table 23 above, if the EUDCH data rate can be sufficiently achieved by applying an SF of 4 or less to the E-DPDCH, the E-DPDCH is assigned to the OVSF codes (SF, SF / 4) in the Q channel. Is sent using. On the other hand, if one E-DPDCH with SF = 4 cannot achieve a sufficient EUDCH data rate, channels are transmitted using the OVSF code in the order listed in Table 23 according to the data rate of the EUDCH. Here, since the OVSF codes (I, 4, 1) are used by the DPDCH, they are used from (Q, 4, 3) to the E-DPDCH.

As another example, when the maximum number of DPDCHs that can be transmitted in Table 23 is 4, at most two codes may be used for the E-DPDCH. In this case, when only one E-DPDCH is transmitted, the OVSF code (SF, SF / 2) is transmitted in the Q channel, and if necessary, the additionally allocated E-DPDCH uses the OVSF code (4, 2) in the I channel. To send it. This is likewise the order in which Method B and I / Q channels are used.

2) Up to 1 DPDCH can be transmitted and HS-DPCCH is set to (Q, 256, 64)

In the E-DPDCH, four OVSF codes (Q, SF, SF / 2 + SF / 4), (I, 4, 3), (Q, 4, 2), and (I, 4, 2) correspond to the EUDCH data rate. Therefore, if necessary, additional allocations are made in order, and SF is available in 4, 8, 16, 32, 64, 128, 256, and 512. For example, if only one E-DPDCH is transmitted, it is transmitted using the OVSF code (SF, SF / 2 + SF / 4) in the Q channel. If the data physical channels are biased on either I or Q channel, the PAPR is increased. In this case, the DPDCH is transmitted on the I channel and the E-DPDCH is transmitted on the Q channel. Since the numbers are even, the increase in PAPR can be reduced.

3) When two or more DPDCHs can be transmitted and HS-DPCCH is set

The same code assignment rules as in Table 23 above apply.

Method D

In the following case, in order to further lower PAPR when multiple E-DPDCH physical channels are transmitted, an OVSF code with SF = 2 is applied to the E-DPDCH except in the following cases.

For example, when (I, 4, 3) and (I, 4, 2) are simultaneously allocated to the E-DPDCH for the multi-code transmission of the E-DPDCH, the (I, 2, 1) to transmit. That is, when OVSF codes (4, 3) and (4, 2) are transmitted using the I channel at the same time, the E-DPDCH transmits using the OVSF codes (2, 1) code on the I channel.

As above, when the OVSF codes (4, 3) and (4, 2) are simultaneously allocated to the E-DPDCH in the Q channel, the E-DPDCH is transmitted using the OVSF codes (2, 1) in the Q channel. . That is, it transmits using (Q, 2, 1) to the E-DPDCH.

Third embodiment

The following describes a proposed method for the case where only one DPCCH is transmitted while ignoring backward compatibility for the HS-DPCCH. That is, in the third embodiment, when the compatibility with respect to the HS-DPCCH is partially violated, an OVSF code and an I / Q channel allocation method for the E-DPCCH, E-DPDCH, and HS-DPCCH are described.

In the case of disregarding the compatibility with the HS-DPCCH as described above according to the third embodiment, the OVSF code (4) including the Q channel OVSF codes (256, 64) used by the HS-DPCCH channel in the first embodiment are included. , E-DPDCH additionally uses codes that can be generated from 1).

As shown in FIG. 6, an additional E-DPDCH physical channel called E-DPDCH3 can be transmitted by using the HS-DPCCH using Q channel OVSF codes 256 and 32. Meanwhile, in the case of the E-DPCCH, the same OVSF code and I / Q channel allocation as those of the first embodiment are assigned. The allocation method for each physical channel is as follows.

1.DPCCH

Since the compatibility for the DPCCH channel is maintained, the same OVSF code and I / Q channel allocation rule as shown in FIG. 4 are applied. That is, the DPCCH is spread by the OVSF codes (256, 0) according to the channel allocation rules of the existing Rel-99 and Rel-5 standards.

2. DPDCH

Since the compatibility for the DPDCH channel is maintained, the same OVSF code and I / Q channel allocation rule are applied as shown in FIG. That is to say DPDCH SF value of a DPDCH is SF _DPDCH channel assignment follows the rules set out in the existing standard specification is spread by the OVSF code (SF _DPDCH, SF _DPDCH / 4) on an I channel. In FIG. 6, c _d represents the OVSF code of the DPDCH.

3.HS-DPCCH

Unlike the first and second embodiments, backward compatibility of the HS-DPCCH is partially violated, and the OVSF code and the I / Q channel allocation method according to the third embodiment are based on the OVSF code (Q channel). 256, 32). This is because the use of OVSF codes (256, 32) in the Q channel for the HS-DPCCH is optimal for PAPR reduction and can also improve the maximum data rate of the EUDCH. By changing the OVSF code used by the HS-DPCCH as described above, the E-DPDCH may additionally use the Q channel OVSF codes 256 and 64 used by the HS-DPCCH channel. Since the Q channel OVSF codes 256 and 64 are generated from the OVSF codes 4 and 1, the Q channel OVSF codes 256 and 64 can be transmitted simultaneously with the E-DPDCH1 and E-DPDCH2 while using the OVSF codes 4 and 1 for the E-DPDCH3. Done.

４.E-DPCCH

As in the case of the first embodiment, when the SF value of the _E-DPCCH is SF _E-DPCCH , overall low PAPR can be achieved by transmitting to the I channel using the OVSF code (SF _E-DPCCH , 1). Possible values of the SF _E-DPCCH are 8, 16, 32, 64, 128, 256.

5. E-DPDCH

As described above, by using the OVSF codes 256 and 32 for the HS-DPCCH, higher EUDCH data rates can be achieved compared to the method described in the first embodiment. The OVSF code and I / Q channel allocation method of the E-DPDCH for this case are summarized as follows.

Method A

1) When two or less E-DPDCH channels are transmitted

1. The same method as in the first embodiment is applied.

In FIG. 6, E-DPDCH1 and E-DPDCH2 may be equally applied to methods A, B, and C described in the first embodiment.

2) When three E-DPDCH channels are transmitted

1. If more than the EUDCH data transmission rate that can be transmitted to E-DPDCH1 and E-DPDCH2 is required, as shown in FIG. 6, E-DPDCH3 is additionally transmitted. In FIG. 6, the EUDCH retransmission controller 502 determines the SF, OVSF code, and the number of channels transmitted in the E-DPDCH.

2. E-DPDCH1 and E-DPDCH2 are assigned to I and Q channels with OVSF codes (2, 1), respectively.

3. E-DPDCH3 is assigned to the Q channel with the OVSF code (4, 1). This is because in the first embodiment, the HS-DPCCH uses the OVSF codes 256 and 64 for the added E-DPDCH3. In this case, BPSK modulation is applied to data transmitted through the E-DPDCH3.

Method B

The OVSF code and I / Q channel of the E-DPDCH are allocated using the OVSF code applied to the DPDCH.

1) When three or less E-DPDCH channels are transmitted

1. The same method as in the second embodiment is applied.

2) When four E-DPDCH channels are transmitted

If the DPDCH is not transmitted, the fourth E-DPDCH is transmitted using the OVSF codes (4, 1) on the I channel.

Referring to FIG. 6, an EUDCH transmission controller 502 transmits a data buffer state, CSI, etc. of a UE necessary for Node B control scheduling to the Node B through the E-DPCCH. The EUDCH transmission control unit 502 determines the E-TFRI, and the determined E-TFRI is transmitted to the Node B through the E-DPCCH. However, transmission of the data buffer state, CSI, etc. of the UE required for the Node B control scheduling does not exclude methods currently discussed in various ways other than the method of transmitting through the E-DPCCH. The packet data transmission format is determined using the maximum data rate available.

The EUDCH packet transmitter 504 receives the packet data of the amount specified by the transmission format of the transferred EUDCH packet data from the EUDCH data buffer 500. The received packet data performs channel coding and modulation using the EUDCH packet data transmission format. E-DPDCH 1, E-DPDCH 2, and E-DPDCH 3 are used for the EUDCH packet data subjected to the coding and modulation. , And transmits to the Node B using a channel.

The data of the DPDCH is spread at the chip rate using the OVSF code c _d in the multiplier 522 and the channel gain in the multiplier 524. multiplied by _d Data of the DPDCH multiplied by the channel gain is input to a summer 526. The control information of the _E-DPCCH is spread at a chip rate using the OVSF code c _{ch, SF, 1,} that is, (SF _E-DPCCH , 1) allocated in the multiplier 506 to maintain orthogonality with other control channels. Channel gain in multiplier 508 multiplied by _ec The control information of the E-DPCCH multiplied by the channel gain is input to the summer 526. The transmission symbol of EDPDCH2 has a real value when modulating using BPSK, but has a complex value when modulating using QPSK and 8PSK as described above. The packet data transferred from the EUDCH packet transmitter 504 is converted into a complex symbol stream of I + jQ and then transmitted to the multiplier 546. The multiplier 546 spreads the modulation symbols at chip rate by the OVSF code. The output of multiplier 546 is multiplied by the channel gain in multiplier 548. The summer 526 adds the input data of the DPDCH, control information of the E-DPCCH, and E-DPDCH2 to form an I channel.

The control information of the DPCCH is spread at the chip rate using the OVSF codes 256 and 0, that is, c _ch, 256 and 0 in the multiplier 528, and the channel gain in the multiplier 530. multiplied by _c The control information of the DPCCH multiplied by the channel gain is input to a summer 536. The control information of the HS-DPCCH is spread at the chip rate using the OVSF codes 256 and 32, that is, c _ch, 256 and 32 in the multiplier 532, and the channel gain in the multiplier 534. multiplied by _hs In addition, the transmission symbol of the E-PDCH1 transmitted from the EUDCH packet transmitter 404 is converted into a complex symbol stream of I + jQ and then transmitted to the multiplier 516. The multiplier 516 spreads the modulation symbols at chip rate by the OVSF code. The output of multiplier 516 is multiplied by the channel gain in multiplier 518.

In addition, the transmission symbol of the E-PDCH3 transmitted from the EUDCH packet transmitter 504 spreads the modulation symbol at the chip rate by the OVSF code in the multiplier 556. The output of the multiplier 556 is multiplied by the channel gain in multiplier 558. The summer 536 adds the input control information of the DPCCH, the control information of the HS-DPCCH, the data of the E-PDCH1 and the data of the E-PDCH3, and forms a Q channel. The output of summer 536 is multiplied by imaginary number in multiplier 538 and then passed to summer 540.

The summer 540 receives the sum of the output of the summer 526 and the output of the multiplier 538 to form a complex symbol string, and then transfers the complex symbol string to the multiplier 550. The multiplier 550 scrambles the transmitted complex symbol string using a scrambling code. The scrambled complex symbol string is converted into a pulse form in the pulse generator 552 and then transmitted to the Node B through the antenna 566 via the RF 554.

FIG. 7 is a diagram illustrating a result of comparing PAPRs of a physical channel according to FIG. 6.

Referring to FIG. 7, 51 and 52 are cases in which different OVSF code assignments or different I / Q channel assignments are applied to the E-DPCCH and the HS-DPCCH. As a result of comparing 50 and 51 according to the present invention, the proposed method has a PAPR reduction effect of about 1.04 dB. In addition, comparing the case of 50 and 52 according to the present invention can confirm the PAPR reduction effect of about 0.19 dB.

Accordingly, when the DPDCH is not transmitted in the same manner as the method D of the first embodiment, the OVSF code (4, 1) is used for the fourth additional E-DPDCH transmission in the I channel to increase the EUDCH packet data rate.

As described above, in the present invention, in the method of allocating the OVSF code and the I / Q channel to the uplink physical channel, the E-DPDCH and E for the EUDCH service while maintaining backward compatibility for the uplink physical channel DPDCH and DPCCH We propose an OVSF code and I / Q channel allocation method optimized for DPCCH. In addition, in order to improve the maximum EUDCH data rate, we propose an HS-DPCCH channel OVSF code that is different from the existing Rel-5 standard and is optimized for E-DPDCH and E-DPCCH for the EUDCH service. We propose OVSF code and I / Q channel allocation method.

Therefore, it is possible to minimize PAPR increase in packet data transmission according to the EUDCH service provision and to minimize errors in EUDCH packet data transmission. Therefore, it has the effect of increasing EUDCH service capacity.

1 is a diagram illustrating a user terminal and a base station for performing uplink transmission.

2 is a diagram illustrating information transmitted and received between a user terminal and a base station to perform uplink transmission.

3 is a diagram illustrating a tree structure of a general orthogonal variable spreading index code.

4 is a diagram illustrating a transmission structure of a user terminal when maintaining compatibility with the WCDMA standard according to an embodiment of the present invention.

5 is a view showing a result of comparing the PAPR of the physical channel according to FIG.

6 is a diagram illustrating a transmission structure of a user terminal when maintaining compatibility with the HSDPA standard according to another embodiment of the present invention.

FIG. 7 is a diagram illustrating a result of comparing PAPRs of physical channels according to FIG. 6. FIG.

Claims (28)

In a method for transmitting uplink packet data in a mobile communication system supporting enhanced uplink packet data transmission, Creating a dedicated physical control channel (DPCCH) using an orthogonal variable spread index (OVSF) code (256, 0) and a Q channel; Generating a dedicated physical data channel (DPDCH) using the OVSF code (SF _DPDCH , SF _DPDCH / 4) and an I channel when the spread index value of the _DPDCH is SF _DPDCH ; When the SF value of the OVSF code to be allocated to the dedicated control channel (E-DPCCH) for supporting uplink packet data transmission is SF _E-DPCCH , the OVSF code (SF _E-DPCCH , 1) and I channel are used. Generating an E-DPCCH; If the SF value of the OVSF code to be allocated to the dedicated data channel (E-DPDCH) for supporting the enhanced uplink packet data transmission is SF _E-DPDCH and the SF value SF _E-DPDCH is 4 or more, the OVSF code (SF _E- Generating an E-DPDCH using _DPDCH , SF _E-DPDCH / 2) and a Q channel; Forming a complex symbol sequence by summing the generated I and Q channels, and then scrambling the complex symbol sequence; And transmitting the scrambled complex symbol sequence through an antenna. The method of claim 1, If the SF _E-DPDCH is 4 and two E-DPDCHs are transmitted simultaneously, the method further includes generating E-DPDCH1 and E-DPDCH2 simultaneously by spreading the OVSF codes (4 and 2) on the I and Q channels, respectively. Said method. The method of claim 1, If the SF _E-DPDCH is 2 and transmits two E-DPDCHs simultaneously, the method further includes generating E-DPDCH1 and E-DPDCH2 by spreading the OVSF codes (2 and 1) on the I and Q channels, respectively. Said method. The method of claim 1, And if the SF _E-DPDCH is 2 and transmits one E-DPDCH, spreading the OVSF code (2, 1) on the Q channel to generate the E-DPDCH. The method of claim 1, In case of downlink high speed downlink packet access (HSDPA) service, HS-DPCCH (High Speed-Downlink Physical Channel) is established using OVSF codes (256, 64) and Q channel. The method further comprises the step of generating. The method of claim 1, Generating three HS-DPCCHs (High Speed-Downlink Physical Channels) using OVSF codes (256, 32) and Q channels when transmitting three E-DPDCHs; Generating E-DPDCH1 and E-DPDCH2 by assigning to OVSF codes (2, 1) to I and Q channels, respectively, And generating an E-DPDCH3 by allocating a Q channel with an OVSF code (4, 1). The method of claim 1, When the maximum number of transmittable channels of the DPDCH is 2 or 4, generating an E-DPCCH using (SF _E-DPDCH , SF _E-DPDCH / 8) and a Q channel. Way. The method of claim 1, The SF _E-DPDCH value of the OVSF code to be assigned to the _E-DPDCH is 4, 8, 16, 32, 64, 128, 256, 512. The method of claim 5, If the HS-DPCCH is not generated (SF _E-DPDCH , 1) and further comprising the step of generating an E-DPDCH using the I channel. The method of claim 9, The SF _E-DPDCH value of the OVSF code to be allocated to the E-DPCCH is 8, 16, 32, 64, 128, 256. The method of claim 9, When the maximum number of transmittable channels of the DPDCH is 1, E-DPDCH1 is generated using the Q channel and the OVSF codes (4, 1), and E-DPDCH2 is generated using the I channel and the OVSF codes (4, 3). Generate E-DPDCH3 using Q channel and OVSF code (4,3), generate E-DPDCH4 using I channel and OVSF code (4,2), and generate Q channel and OVSF code (4). And (2) generating the E-DPDCH5. The method of claim 5, And generating an E-DPDCH using an I channel and an OVSF code (2, 1) when the DPDCH is transmitted in a multi code. In a method for transmitting uplink packet data in a mobile communication system supporting enhanced uplink packet data transmission, Creating a dedicated physical control channel to support dedicated physical channels and fast forward packet service using an Orthogonal Variable Spreading Index (OVSF) code; Generating dedicated physical channels for enhanced uplink packet data transmission using an OVSF code not used by the physical channels; Forming a complex symbol sequence by summing the generated I and Q channel signals of the channels and then scrambling the complex symbol sequence; And transmitting the scrambled complex symbol sequence through an antenna. In a method for transmitting uplink packet data in a mobile communication system supporting enhanced uplink packet data transmission, Dedicated physical control channel for supporting high-speed forward packet service through I channel using orthogonal variable spread index (OVSF) code of (256, 1) when the number of transmitable physical channels (DPDCH) is 2 or 4 Creating a High Speed Dedicated Physical Control Channel (HS-DPCCH), Generating an E-DPCCH through a Q channel using an OVSF code of (SF, SF / 8) based on a spreading index (SF) of a dedicated control channel (E-DPCCH) for enhanced uplink; (I, 4, 3), (Q, 4, 3), (I, 4, 2), (Q, 4, 2) or according to the data rate to be transmitted through the enhanced uplink and the number of DPDCHs Generating a plurality of E-DPDCHs in the order of (I, 4, 2), (Q, 4, 2); Forming a complex symbol sequence by summing the generated I and Q channels, and then scrambling the complex symbol sequence; And transmitting the scrambled complex symbol sequence through an antenna. In the method for transmitting uplink packet data in a mobile communication system that supports packet enhanced uplink packet data transmission when the number of transmit dedicated physical channels is at least one and a dedicated physical channel for a high speed forward packet is not set. , Generating an E-DPCCH through an I channel using an OVSF code of (SF, 1) based on a spreading index (SF) of a dedicated control channel (E-DPCCH) for enhanced uplink; If the number of transmittable dedicated physical channels (DPDCH) is one, according to the data rate to be transmitted (Q, spreading index (SF _, SF / 4) of the dedicated data channel (E-DPDCH) for enhanced uplink (SF _, SF / 4), (I 4, 3), (Q, 4, 3), (I, 4, 2), (Q, 4, 2) in order to generate a plurality of E-DPDCH, Forming a complex symbol sequence by summing the generated I and Q channels, and then scrambling the complex symbol sequence; And transmitting the scrambled complex symbol sequence through an antenna. The method of claim 15, The spreading index (SF _E-DPCCH ) of the dedicated control channel (E-DPCCH) for the enhanced uplink is 8, 16, 32, 64, 128, 256. The method of claim 15, The spreading index (SF _E-DPDCH ) of the dedicated data channel (E-DPDCH) for the enhanced uplink is 4, 8, 16, 32, 64, 128, 256, 512. In a method for transmitting uplink packet data in a mobile communication system supporting enhanced uplink packet data transmission, Dedicated for enhanced uplink when the number of dedicated physical channels (DPDCH) that can be transmitted is one and a dedicated physical channel (HS-DPCCH) for a high-speed forward packet is generated using OVSF codes of (Q, 256, 64). Generating an E-DPCCH through the I channel using the OVSF code of (SF, 1) based on the spreading index (SF) of the control channel (E-DPCCH), According to the data rate to be transmitted, (I, spreading index (SF) _, SF / 2 + SF / 4) of the dedicated data channel (E-DPDCH) for enhanced uplink, (Q, 4, 3), (I, Generating a plurality of E-DPDCHs in the order of 4, 2), (Q, 4, 2), Forming a complex symbol sequence by summing the generated I and Q channels, and then scrambling the complex symbol sequence; And transmitting the scrambled complex symbol sequence through an antenna. The method of claim 18, If the number of transmittable dedicated physical channels is 2 or 4 and a dedicated physical channel for a fast forward packet is generated using an OVSF code of (I, 256, 1), an OVSF code of (SF, SF / 8) is generated. Using the Q channel to generate an E-DPCCH. The method of claim 15, If the number of transmittable physical channels (DPDCHs) increases, the OVSF code for the dedicated physical channels is allocated first, and then the spread index (SF of (Q, dedicated data channel (E-DPDCH) for enhanced uplink) ) _, SF / 4)), (I, 4, 3), (Q, 4, 3), (I, 4, 2), (Q, 4, 2) in order to generate a plurality of E-DPDCH The method characterized in that it further comprises. An apparatus for transmitting uplink packet data in a mobile communication system supporting enhanced uplink packet data transmission, In consideration of the amount of data to be transmitted, the number of enhanced uplink physical channels for transmitting packet data and a spreading index corresponding to the transmission rate of the data are determined. A transmission control unit for allocating an orthogonal variable spread index code to distinguish a physical channel for transmitting control information for receiving data; And a transmitter configured to generate an enhanced uplink physical channel for transmitting the packet data according to the number of the uplink physical channels and the spreading index transmitted from the transmission controller and to transmit the packet data. Device. In a method for transmitting uplink packet data in a mobile communication system supporting enhanced uplink packet data transmission, Based on the spread rate (SF) of the dedicated control channel (E-DPCCH) for the enhanced uplink according to the data rate to be transmitted through the uplink considering the number of dedicated physical channels that can be transmitted (SF _, SF / 4) Assigning E-DPDCHs alternately to I and Q channels in the order of (4, 3), (4, 2), Forming a complex symbol sequence by summing the generated I and Q channels, and then scrambling the complex symbol sequence; And transmitting the scrambled complex symbol string through an antenna. The method of claim 22, When the number of transmittable dedicated physical channels is 0 and up to six E-DPDCHs are used, (I, SF _, SF / 4), (Q, 4, 1), (I, 4, 3), (Q, 4, 3), (I, 4, 2), (Q, 4, 2) the orthogonal conversion code assigned in the order of the above method. The method of claim 22, When the number of transmittable dedicated physical channels is zero and up to six E-DPDCHs are used, (Q, SF _, SF / 4), (I, 4, 1), (Q, 4, 3), (I, 4, 3), (Q, 4, 2), (I, 4, 2) in the order of orthogonal conversion code assigned to the method. The method of claim 22, The E-DPDCHs are alternately allocated to the Q channel and the I channel in the order of (2, 1), (4, 1) according to the data rate to be transmitted through the uplink by discriminating whether the HS-DPCCH is used or not. And further comprising a process. In the method for transmitting data in a mobile communication system supporting uplink packet data transmission, Allocating an orthogonal code in consideration of the number of physical channels required for the uplink packet data transmission, and spreading the packet data using the orthogonal code; Summing the spread packet data signal with the spread signal using another orthogonal code; Characterized in that the process of transmitting the summed spread signal through an antenna, Here, when the SF _E-DPDCH is _referred to as a spreading coefficient, when the number of physical channels required for the uplink packet data transmission is one, I channels (SF _E-DPDCH and SF _E-DPDCH / 2) are used. The method using the I and Q channels (2, 1). The method of claim 26, The SF _E-DPDCH is characterized in that 2, 4, 8, 16, 32, 64, 128, 256, 512. The method of claim 26, The orthogonal code allocation method is applied when the HS-DPCCH is set in the Q channel (256, 64).