CN101635582B - Apparatus and method used in wideband code division multiple access (WCDMA) systems - Google Patents

Abstract

The present invention assumes the use of an Enhanced Uplink Dedicated Transport Channel (EUDCH) in a Wideband Code Division Multiple Access (WCDMA) system. In a user equipment (UE), when a physical channel for transmitting EUDCH data is transmitted in addition to an existing physical channel, a peak-to-average power ratio (PAPR) of an uplink transmission signal increases. The increase in PAPR depends on the Orthogonal Variable Spreading Factor (OVSF) codes assigned to the corresponding physical channels, and In-phase/Quadrature-phase (I/Q) channels. Therefore, the present invention proposes an apparatus and method for allocating optimal OVSF codes and I/Q channels to EUDCH-related physical channels in order to minimize PAPR increase due to EUDCH.

Description

Apparatus and method for wideband code division multiple access system

The application date is February 14, 2005, the application number is 200580004918.2, and the title of the invention is "distributing orthogonal variable spreading factor codes and same phase/orthogonal phase channels in wideband code division multiple access system so as to reduce Device and method for enhancing the peak-to-average power ratio when transmitting data through an uplink dedicated channel" is a divisional application of the invention patent application.

technical field

The present invention relates generally to asynchronous Wideband Code Division Multiple Access (WCDMA) communication systems, and more particularly to a method for minimizing the Peak-to-Average Power Ratio (PAPR) of a transmitted signal during data transmission over an Enhanced Uplink Dedicated Transport Channel (EUDCH). ) increases.

That is, the present invention proposes an optimal Orthogonal Variable Spreading Factor (OVSF) code and In-phase/Quadrature-phase (I/Q) channel allocation apparatus and method for uplink physical channels of EUDCH service.

Background technique

Currently, the uplink of a WCDMA system includes a dedicated physical data channel (DPDCH) and a dedicated physical control channel (DPCCH), as typical dedicated physical channels for transmitting user signals. DPDCH is a data transmission channel on which user data such as voice and images are transmitted, and DPCCH is a control information transmission channel on which DPDCH frame format information and pilot information for DPDCH demodulation and power control are carried.

Recently, a technique using EUDCH, which is an enhanced uplink data-only transport channel, has been proposed to improve the rate and efficiency of packet data transmission in uplink.

FIG. 1 is a diagram illustrating information exchanged between a user equipment and a Node B in order to perform uplink transmission.

Referring to FIG. 1, UEs 110, 112, 114, and 116 transmit packet data at different transmit powers according to their distances from Node B 100. The UE 110 located at the longest distance from the Node B 100 transmits packet data at the highest transmit power 120 for the uplink channel, while the UE 114 located at the shortest distance from the Node B transmits packet data at the lowest transmit power 124 for the uplink channel to send packet data. In order to improve the performance of the mobile communication system, the Node B 100 may perform scheduling in such a manner that the level of transmission power for an uplink channel should be inversely proportional to the data rate. That is, the Node B assigns the lowest data rate to the UE with the highest transmit power for the uplink channel, and assigns the highest data rate to the UE with the lowest transmit power for the uplink channel.

FIG. 2 is a diagram illustrating information exchanged between a UE and a Node B in order to perform uplink transmission. That is, FIG. 2 shows the basic procedures required between Node B 200 and UE 202 for packet data transmission over EUDCH.

Referring to FIG. 2, at step 210, an EUDCH is established between Node B 200 and UE 202. Step 210 includes the process of sending/receiving messages over a dedicated transport channel. After step 210, UE 202 sends information about the expected data rate, and information indicative of uplink channel conditions, to Node B 200 in step 212. The information representing the uplink channel condition includes the transmission power of the uplink channel transmitted by UE 202, and the transmission power margin of UE 203.

The Node B 200 receiving the uplink channel transmission power can estimate the downlink channel condition by comparing the uplink channel transmission power with the received power. That is, the Node B 200 considers that the uplink channel condition is good if the difference between the uplink channel transmission power and the uplink channel reception power is small, and considers that the uplink channel condition is good if the difference between the transmission power and the reception power is large. Road conditions are poor. When the UE transmits the transmit power margin to estimate uplink channel conditions, the Node B 200 may estimate the uplink transmit power by subtracting the transmit power margin from the known possible maximum transmit power for the UE. The Node B 200 uses the estimated channel conditions of the UE 202, and information about the data rate required by the UE 202 to determine the possible maximum data rate for the UE 202's uplink packet channel.

In step 214, the UE 202 is notified of the determined possible maximum data rate. The UE 202 determines a data rate for sending the packet data within the range of the notified possible maximum data rate, and at step 216, sends the packet data to the Node B 200 at the determined data rate.

Here, the uplink physical channels supporting EUDCH services include: Dedicated Physical Data Channel (DPDCH), Dedicated Physical Control Channel (DPCCH), High Speed Dedicated Physical Control Channel (HS-DPCCH) for HSDPA services, Enhanced Dedicated Physical Data Channel (E-DPDCH) and Enhanced Dedicated Physical Control Channel (E-DPCCH) for EUDCH services.

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

If, in order to transmit EUDCH packet data as described above, UE 202 transmits a separate physical channel in addition to the existing physical channel, the number of physical channels transmitted in the uplink increases, resulting in a peak-to-average peak-to-average The power ratio (PAPR) increases. In general, the higher the number of simultaneously transmitted physical channels increases, the higher the PAPR increases.

Since a PAPR increase may increase distortion of the transmitted signal and allowable Adjacent Channel Leakage Power Ratio (ACLR), the radio frequency (RF) power amplifier in the UE requires power compensation, which reduces the input power of the amplifier to prevent the aforementioned problems. If the UE performs power compensation, the power compensation results in a reduction in received power at a receiver in the Node B, resulting in an increase in error rate of received data or reduction in cell coverage.

Therefore, in order to prevent the PAPR from increasing, the UE intends to transmit the EUDCH on an existing physical channel such as DPDCH based on a time-division manner instead of transmitting the EUDCH on a separate physical channel. However, the process of transmitting the EUDCH on an existing physical channel based on a time-sharing manner leads to an increase in implementation complexity.

In consideration of this problem, the WCDMA system proposes a method for multiplying physical channels by OVSF codes satisfying mutual orthogonality before transmission in uplink. In Node B, the physical channel multiplied by the OVSF code can be identified.

FIG. 3 is a diagram showing a tree structure of an OVSF code generally used in a WCDMA system.

Referring to FIG. 3, the OVSF code can be simply generated in the calculation process of Equation (1) to Equation (3).

Equation (1)

C _ch,1,0 =1

Equation (2)

$\left[\begin{array}{c}{\mathrm{<span\; class="notranslate">\; C</span>}}_{\mathrm{<span\; class="notranslate">\; ch</span>}<span\; class="notranslate">\; ,</span>\mathrm{<span\; class="notranslate">\; 2,0</span>}}\\ {\mathrm{<span\; class="notranslate">\; C</span>}}_{\mathrm{<span\; class="notranslate">\; ch</span>}<span\; class="notranslate">\; ,</span>\mathrm{<span\; class="notranslate">\; 2,1</span>}}\end{array}\right]<span\; class="notranslate">\; =</span>\left[\begin{array}{cc}{\mathrm{<span\; class="notranslate">\; C</span>}}_{\mathrm{<span\; class="notranslate">\; ch</span>}<span\; class="notranslate">\; ,</span>\mathrm{<span\; class="notranslate">\; 1,0</span>}}& {\mathrm{<span\; class="notranslate">\; C</span>}}_{\mathrm{<span\; class="notranslate">\; ch</span>}<span\; class="notranslate">\; ,</span>\mathrm{<span\; class="notranslate">\; 1,0</span>}}\\ {\mathrm{<span\; class="notranslate">\; C</span>}}_{\mathrm{<span\; class="notranslate">\; ch</span>}<span\; class="notranslate">\; ,</span>\mathrm{<span\; class="notranslate">\; 1,0</span>}}& <span\; class="notranslate">\; -</span>{\mathrm{<span\; class="notranslate">\; C</span>}}_{\mathrm{<span\; class="notranslate">\; ch</span>}<span\; class="notranslate">\; ,</span>\mathrm{<span\; class="notranslate">\; 1,0</span>}}\end{array}\right]<span\; class="notranslate">\; =</span>\left[\begin{array}{cc}\mathrm{<span\; class="notranslate">\; 1</span>}& \mathrm{<span\; class="notranslate">\; 1</span>}\\ \mathrm{<span\; class="notranslate">\; 1</span>}& <span\; class="notranslate">\; -</span>\mathrm{<span\; class="notranslate">\; 1</span>}\end{array}\right]$

Equation (3)

$\left[\begin{array}{c}{\mathrm{<span\; class="notranslate">\; C</span>}}_{\mathrm{<span\; class="notranslate">\; ch</span>}<span\; class="notranslate">\; ,</span>{\mathrm{<span\; class="notranslate">\; 2</span>}}^{<span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; no</span>}<span\; class="notranslate">\; +</span>\mathrm{<span\; class="notranslate">\; 1</span>}<span\; class="notranslate">\; )</span>}<span\; class="notranslate">\; ,</span>\mathrm{<span\; class="notranslate">\; 0</span>}}\\ {\mathrm{<span\; class="notranslate">\; C</span>}}_{\mathrm{<span\; class="notranslate">\; ch</span>}<span\; class="notranslate">\; ,</span>{\mathrm{<span\; class="notranslate">\; 2</span>}}^{<span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; no</span>}<span\; class="notranslate">\; +</span>\mathrm{<span\; class="notranslate">\; 1</span>}<span\; class="notranslate">\; )</span>}<span\; class="notranslate">\; ,</span>\mathrm{<span\; class="notranslate">\; 1</span>}}\\ {\mathrm{<span\; class="notranslate">\; C</span>}}_{\mathrm{<span\; class="notranslate">\; ch</span>}<span\; class="notranslate">\; ,</span>{\mathrm{<span\; class="notranslate">\; 2</span>}}^{<span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; no</span>}<span\; class="notranslate">\; +</span>\mathrm{<span\; class="notranslate">\; 1</span>}<span\; class="notranslate">\; )</span>}<span\; class="notranslate">\; ,</span>\mathrm{<span\; class="notranslate">\; 2</span>}}\\ {\mathrm{<span\; class="notranslate">\; C</span>}}_{\mathrm{<span\; class="notranslate">\; ch</span>}<span\; class="notranslate">\; ,</span>{\mathrm{<span\; class="notranslate">\; 2</span>}}^{<span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; no</span>}<span\; class="notranslate">\; -</span>\mathrm{<span\; class="notranslate">\; 1</span>}<span\; class="notranslate">\; )</span>}<span\; class="notranslate">\; ,</span>\mathrm{<span\; class="notranslate">\; 3</span>}}\\ <span\; class="notranslate">\; .</span>\\ <span\; class="notranslate">\; .</span>\\ <span\; class="notranslate">\; .</span>\\ {\mathrm{<span\; class="notranslate">\; C</span>}}_{\mathrm{<span\; class="notranslate">\; ch</span>}<span\; class="notranslate">\; ,</span>{\mathrm{<span\; class="notranslate">\; 2</span>}}^{<span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; no</span>}<span\; class="notranslate">\; +</span>\mathrm{<span\; class="notranslate">\; 1</span>}<span\; class="notranslate">\; )</span>}<span\; class="notranslate">\; ,</span>{\mathrm{<span\; class="notranslate">\; 2</span>}}^{<span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; no</span>}<span\; class="notranslate">\; +</span>\mathrm{<span\; class="notranslate">\; 1</span>}<span\; class="notranslate">\; )</span>}<span\; class="notranslate">\; -</span>\mathrm{<span\; class="notranslate">\; 2</span>}}\\ {\mathrm{<span\; class="notranslate">\; C</span>}}_{\mathrm{<span\; class="notranslate">\; ch</span>}<span\; class="notranslate">\; ,</span>{\mathrm{<span\; class="notranslate">\; 2</span>}}^{<span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; no</span>}<span\; class="notranslate">\; +</span>\mathrm{<span\; class="notranslate">\; 1</span>}<span\; class="notranslate">\; )</span>}<span\; class="notranslate">\; ,</span>{\mathrm{<span\; class="notranslate">\; 2</span>}}^{<span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; no</span>}<span\; class="notranslate">\; +</span>\mathrm{<span\; class="notranslate">\; 1</span>}<span\; class="notranslate">\; )</span>}<span\; class="notranslate">\; -</span>\mathrm{<span\; class="notranslate">\; 1</span>}}\end{array}\right]<span\; class="notranslate">\; =</span>\left[\begin{array}{cc}{\mathrm{<span\; class="notranslate">\; C</span>}}_{\mathrm{<span\; class="notranslate">\; ch</span>}<span\; class="notranslate">\; ,</span>{\mathrm{<span\; class="notranslate">\; 2</span>}}^{\mathrm{<span\; class="notranslate">\; no</span>}}<span\; class="notranslate">\; ,</span>\mathrm{<span\; class="notranslate">\; 0</span>}}& {\mathrm{<span\; class="notranslate">\; C</span>}}_{\mathrm{<span\; class="notranslate">\; ch</span>}<span\; class="notranslate">\; ,</span>{\mathrm{<span\; class="notranslate">\; 2</span>}}^{\mathrm{<span\; class="notranslate">\; no</span>}}<span\; class="notranslate">\; ,</span>\mathrm{<span\; class="notranslate">\; 0</span>}}\\ {\mathrm{<span\; class="notranslate">\; C</span>}}_{\mathrm{<span\; class="notranslate">\; ch</span>}<span\; class="notranslate">\; ,</span>{\mathrm{<span\; class="notranslate">\; 2</span>}}^{\mathrm{<span\; class="notranslate">\; no</span>}}<span\; class="notranslate">\; ,</span>\mathrm{<span\; class="notranslate">\; 0</span>}}& <span\; class="notranslate">\; -</span>{\mathrm{<span\; class="notranslate">\; C</span>}}_{\mathrm{<span\; class="notranslate">\; ch</span>}<span\; class="notranslate">\; ,</span>{\mathrm{<span\; class="notranslate">\; 2</span>}}^{\mathrm{<span\; class="notranslate">\; no</span>}}<span\; class="notranslate">\; ,</span>\mathrm{<span\; class="notranslate">\; 0</span>}}\\ {\mathrm{<span\; class="notranslate">\; C</span>}}_{\mathrm{<span\; class="notranslate">\; ch</span>}<span\; class="notranslate">\; ,</span>{\mathrm{<span\; class="notranslate">\; 2</span>}}^{\mathrm{<span\; class="notranslate">\; no</span>}}<span\; class="notranslate">\; ,</span>\mathrm{<span\; class="notranslate">\; 1</span>}}& {\mathrm{<span\; class="notranslate">\; C</span>}}_{\mathrm{<span\; class="notranslate">\; ch</span>}<span\; class="notranslate">\; ,</span>{\mathrm{<span\; class="notranslate">\; 2</span>}}^{\mathrm{<span\; class="notranslate">\; no</span>}}<span\; class="notranslate">\; ,</span>\mathrm{<span\; class="notranslate">\; 1</span>}}\\ {\mathrm{<span\; class="notranslate">\; C</span>}}_{\mathrm{<span\; class="notranslate">\; ch</span>}<span\; class="notranslate">\; ,</span>{\mathrm{<span\; class="notranslate">\; 2</span>}}^{\mathrm{<span\; class="notranslate">\; no</span>}}<span\; class="notranslate">\; ,</span>\mathrm{<span\; class="notranslate">\; 1</span>}}& <span\; class="notranslate">\; -</span>{\mathrm{<span\; class="notranslate">\; C</span>}}_{\mathrm{<span\; class="notranslate">\; ch</span>}<span\; class="notranslate">\; ,</span>{\mathrm{<span\; class="notranslate">\; 2</span>}}^{\mathrm{<span\; class="notranslate">\; no</span>}}<span\; class="notranslate">\; ,</span>\mathrm{<span\; class="notranslate">\; 1</span>}}\\ <span\; class="notranslate">\; .</span>& <span\; class="notranslate">\; .</span>\\ <span\; class="notranslate">\; .</span>& <span\; class="notranslate">\; .</span>\\ <span\; class="notranslate">\; .</span>& <span\; class="notranslate">\; .</span>\\ {\mathrm{<span\; class="notranslate">\; C</span>}}_{\mathrm{<span\; class="notranslate">\; ch</span>}<span\; class="notranslate">\; ,</span>{\mathrm{<span\; class="notranslate">\; 2</span>}}^{\mathrm{<span\; class="notranslate">\; no</span>}}<span\; class="notranslate">\; ,</span>{\mathrm{<span\; class="notranslate">\; 2</span>}}^{\mathrm{<span\; class="notranslate">\; no</span>}}<span\; class="notranslate">\; -</span>\mathrm{<span\; class="notranslate">\; 1</span>}}& {\mathrm{<span\; class="notranslate">\; C</span>}}_{\mathrm{<span\; class="notranslate">\; ch</span>}<span\; class="notranslate">\; ,</span>{\mathrm{<span\; class="notranslate">\; 2</span>}}^{\mathrm{<span\; class="notranslate">\; no</span>}}<span\; class="notranslate">\; ,</span>{\mathrm{<span\; class="notranslate">\; 2</span>}}^{\mathrm{<span\; class="notranslate">\; no</span>}}<span\; class="notranslate">\; -</span>\mathrm{<span\; class="notranslate">\; 1</span>}}\\ {\mathrm{<span\; class="notranslate">\; C</span>}}_{\mathrm{<span\; class="notranslate">\; ch</span>}<span\; class="notranslate">\; ,</span>{\mathrm{<span\; class="notranslate">\; 2</span>}}^{\mathrm{<span\; class="notranslate">\; no</span>}}<span\; class="notranslate">\; ,</span>{\mathrm{<span\; class="notranslate">\; 2</span>}}^{\mathrm{<span\; class="notranslate">\; no</span>}}<span\; class="notranslate">\; -</span>\mathrm{<span\; class="notranslate">\; 1</span>}}& <span\; class="notranslate">\; -</span>{\mathrm{<span\; class="notranslate">\; C</span>}}_{\mathrm{<span\; class="notranslate">\; ch</span>}<span\; class="notranslate">\; ,</span>{\mathrm{<span\; class="notranslate">\; 2</span>}}^{\mathrm{<span\; class="notranslate">\; no</span>}}<span\; class="notranslate">\; ,</span>{\mathrm{<span\; class="notranslate">\; 2</span>}}^{\mathrm{<span\; class="notranslate">\; no</span>}}<span\; class="notranslate">\; -</span>\mathrm{<span\; class="notranslate">\; 1</span>}}\end{array}\right]$

As shown in FIG. 3, the OVSF code is characterized by ensuring orthogonality between codes having the same spreading factor (SF). Also, for two codes with different SF values, orthogonality is obtained between two codes if a code with a larger SF value cannot be generated from a code with a lower SF value using equation (3).

The description thereof will be made below as an example.

For SF=4, C _ch,4,0 =(1,1,1,1) is orthogonal to C _ch,2,1 =(1,-1), but is orthogonal to C _ch,2,0 =(1, 1) Not orthogonal.

As another example, compare the SF=256 OVSF code with C _ch,2,1 =(1,1), because an OVSF with SF=0˜127 is generated from C _ch,2,1 =(1,1) code, so orthogonality is not ensured between them. That is, since a higher data rate is required, an OVSF code with a lower SF value is used, and when a plurality of physical channels are simultaneously transmitted, the OVSF codes should be allocated such that orthogonality should have to be ensured therebetween.

Even though the two physical channels use the same OVSF code, if they are transmitted through the transmitter's I channel and Q channel respectively, the receiver can separate the two physical channel signals without interfering with each other, and demodulate the separated physical channel signals , because the signals transmitted on the I-channel and Q-channel are carried by carriers with a phase difference of 90°.

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

In the WCDMA system to which the EUDCH technique is applied, if the E-DPCCH and E-DPDCH channels for transmitting EUDCH packet data are simultaneously transmitted in addition to the uplink channel, the PAPR undesirably increases.

Contents of the invention

Accordingly, an object of the present invention is to provide a UE transmitting apparatus and method for efficiently transmitting packet data through an enhanced uplink in a mobile communication system.

Another object of the present invention is to provide an OVSF code and I/Q channel allocation apparatus and method for minimizing an increase in PAPR of an uplink transmission signal in a mobile communication system supporting an uplink.

Another object of the present invention is to provide an apparatus and method for allocating I/Q channels and OVSF codes for E-DPDCH and E-DPCCH according to the presence/absence of HS-DPCCH and the number of codes used for DPDCH, to minimize the increase in PAPR.

According to an aspect of the present invention, in order to achieve the object of the present invention, a method for transmitting packet data in a mobile communication system supporting enhanced transmission of uplink packet data is provided, the method comprising the following steps: using an orthogonal Variable Spreading Factor (OVSF) code (256, 0) and quadrature phase (Q) channel to generate Dedicated Physical Control Channel (DPCCH); use OVSF code (SF _DPDCH , SF _DPDCH /4) and same phase (I) channel to generate a dedicated physical data channel (DPDCH), where SF _DPDCH represents the spreading factor of the DPDCH; use the OVSF code (SF _E-DPCCH , 1) and an I channel to generate an E-DPCCH, where SF _E-DPCCH represents the distribution to Spreading factor of OVSF code of E-DPCCH, E-DPCCH is used to support the transmission of enhanced uplink packet data; use OVSF code (SF _E-DPDCH , SF _E-DPDCH /2) and Q channel to generate E-DPDCH , where SFE _-DPDCH represents the spreading factor (SF) value of the OVSF code to be assigned to E-DPDCH, and SFE _-DPDCH is greater than 4; a composite is formed by summing up the generated I and Q channels and scrambling the composite symbol stream; and transmitting the scrambled composite symbol stream through the antenna.

According to another aspect of the present invention, in order to achieve the object of the present invention, a method for transmitting uplink packet data in a mobile communication system supporting enhanced transmission of uplink packet data is provided, the method comprising the following steps : Use Orthogonal Variable Spreading Factor (OVSF) codes to generate dedicated physical channels and dedicated physical control channels for supporting high-speed downlink packet services; use OVSF codes not used by physical channels to generate enhanced uplink a dedicated physical channel linking packet data; forming a composite symbol stream by summing the I channel and Q channel of the generated channel, and scrambling the composite symbol stream; and transmitting the scrambled composite symbol stream through the antenna .

Description of drawings

According to the following detailed description in conjunction with the accompanying drawings, the above and other objects, features and advantages of the present invention will become more apparent, wherein:

FIG. 1 is a diagram illustrating a user equipment (UE) and a Node B performing uplink transmission;

FIG. 2 is a diagram illustrating information exchanged between a UE and a Node B to perform uplink transmission.

Fig. 3 is a diagram showing a tree structure for a general OVSF code.

4 is a diagram illustrating a transmitter structure of a UE according to an embodiment of the present invention; and

FIG. 5 is a diagram of a PAPR comparison result between physical channels according to an embodiment of the present invention.

Detailed ways

Now, several preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. In the following description, detailed descriptions of known functions and configurations incorporated herein are omitted for conciseness.

The present invention proposes an OVSF code and an I/Q channel allocation method for minimizing an increase in PAPR of an uplink transmission signal in a WCDMA system supporting EUDCH data service. That is, the present invention proposes an OVSF code and an I/Q channel allocation method optimized for the case where, in addition to existing physical channels, E- DPCCH and E-DPDCH as a data channel. In order to increase the EUDCH data rate and minimize the PAPR increase, the present invention proposes an OVSF code and I/Q channel allocation method for minimizing the PAPR increase while maintaining the existing DPCCH, DPDCH and HS-DPCCH Orthogonality between.

In the existing Rel-5 WCDMA standard, the OVSF code and I/Q channel allocation for the HS-DPCCH channel is implemented considering the maximum number of transmittable DPDCHs determined during the establishment of the radio link between the UE and the Node B, In order to reduce PAPR.

Therefore, for Rel-5 physical channels, the OVSF codes for E-DPDCH and E-DPCCH proposed in this invention are implemented considering the maximum number of DPDCHs that can be transmitted in the radio link and the transmission/non-transmission of HS-DPCCH and I/Q channel assignments. In EUDCH service, several E-DPDCH physical channels can be transmitted simultaneously because they support high data rate transmission. Generally, however, it is sufficient to transmit a single E-DPCCH as a physical control channel.

That is, in order to reduce PAPR increase of an uplink transmission signal, the present invention supports EUDCH in consideration of backward compatibility with existing WCDMA systems. The reason for this is that when Node Bs are mutually inconsistent in versions due to incompatibility with DPDCH and DPCCH standards, serious problems may occur in initial call setup or handover processing.

In other words, the present invention proposes an OVSF code and I/Q channel allocation method optimized to minimize the PAPR increase of the EUDCH-related physical channels while maintaining The existing Rel-5WCDMA standard.

First, it is assumed that by maintaining full compatibility with existing Rel-5 WCDMA systems, in the OVSF code and I/Q channel allocation method, existing uplink channels such as DPCCH, DPDCH, and HS-DPCCH experience OVSF code and I/Q channel allocation defined in the standard, the present invention proposes a kind of OVSF code and I/Q channel allocation method optimized for such a situation, promptly based on this assumption and send E-DPCCH and E-DPCCH additionally DPDCH, which is a physical channel for transmitting EUDCH packet data.

Second, the case of partial loss of compatibility with HS-DPCCH while maintaining compatibility with existing DPDCH and DPCCH will be considered. In the current Rel-5 WCDMA standard, if the maximum number of transmittable DPDCHs is one, the HS-DPCCH is transmitted on the Q channel using the OVSF code (256, 64). In this case, the maximum EUDCH data rate is limited because E-DPDCH cannot use OVSF code (4, 1) on the Q channel. In order to solve this problem, the present invention proposes a code allocation rule for HS-DPCCH, E-DPCCH and E-DPDCH, in order to allow E-DPDCH to use OVSF code (4, 1) on the Q channel, and reduce UE transmits the PAPR of the signal.

Third, in the Rel-6 standard, even the EUDCH independent case is considered, where no DPDCH is sent in uplink but only E-DPDCH. Therefore, the present invention proposes OVSF codes and I/Q channel allocation rules for HS-DPCCH for the EUDCH independent case.

In the aforementioned method, the allocation of I/Q channels and OVSF codes for HS-DPCCH depends on the maximum number of transmittable DPDCH channels, and the number of E-DPDCH channels does not affect the allocation rules for HS-DPCCH. This is because the E-DPDCH is not always sent, but only when there is data in the UE's EUDCH data buffer. Therefore, according to PAPR, the OVSF codes and I/Q channel allocation rules for HS-DPCCH are preferably defined considering only DPDCH according to the current standard.

FIG. 4 is a diagram illustrating a transmitter structure of a UE according to an embodiment of the present invention.

1. DPCCH

According to the existing Rel-99 and Rel-5 channel allocation rules, the OVSF code (256, 0) is allocated to the DPCCH on the Q channel. (256,0) is equal to the OVSF code C _ch,256,0 shown in FIG. 3 . That is, in FIG. 4 , after BPSK modulation, the DPCCH is multiplied by the OVSF code C _ch,256,0 for spectrum spreading, and then multiplied by the transmission gain β _c . β _c is set by the network according to the rate of data sent by the UE or the required quality of service level.

The DPCCH signal is added to other channel signals transmitted through the Q channel, multiplied by the scrambling code S _dpch,n , and then transmitted via the antenna through the transmit pulse forming filter and RF stage.

2. DPDCH

According to the channel allocation rule defined in the existing standard, if the SF value of the DPDCH is represented by the SF _DPDCH , then the DPDCH is spread with the OVSF code (SF _DPDCH, SF _DPDCH /4) on the I channel. In FIG. 4, c _d represents an OVSF code for DPDCH. In the present invention, it is assumed that only at most one DPDCH channel is transmitted when a physical channel related to the EUDCH service is transmitted together with the DPDCH.

3. HS-DPCCH

Additionally, this follows the existing Rel-5 standard and is only sent when HSDPA service is implemented in the downlink. It can be seen in Fig. 4 that when only one DPDCH is transmitted in the uplink, the HS-DPCCH is spread with OVSF code (256, 64) on the Q channel.

4. E-DPCCH

E-DPCCH, the physical control channel used for EUDCH service, transmits the buffer status of the UE, or transmits uplink transmit power, uplink transmit power margin, and channel state information (CSI), which Node B needs to estimate Uplink channel conditions. The E-DPCCH transmits the Transport Format and Resource Indicator (E-TFRI) for EUDCH services transmitted on the E-DPDCH.

If the SF value of _{the E-DPCCH} is represented by SF E-DPCCH, then the E-DPCCH is spread with the OVSF code (SF _E-DPCCH , 1) on the I channel. Here, OVSF codes and I/Q channels are allocated to E-DPCCH in a free manner.

In an alternative approach, the E-DPCCH uses the OVSF code (SF _E-DPCCH , 1) on the Q channel instead of the DPCCH sent on the I channel using the OVSF code (256, 1).

In another optional method, when the DPDCH is not established but the HS-DPCCH is established, the E-DPCCH is allocated to the Q channel. In this case, the OVSF code ( _SFE-DPCCH , 1) or (SFE _-DPCCH , SFE _-DPCCH /8) is suitable for E-DPCCH.

In another optional method, when no DPDCH is established, the E-DPCCH can be allocated to the Q channel regardless of the establishment/non-establishment of the HS-DPCCH. In this case, the OVSF code ( _SFE-DPCCH , 1) or (SFE _-DPCCH , SFE _-DPCCH /8) is suitable for E-DPCCH.

Such rules are always available regardless of the transmission/non-transmission of HS-DPCCH, and the number of E-DPDCH channels. In this case, 8, 16, 32, 64, 128, and 256 are available for SFE _-DPCCH , and considering the amount of information to be sent on E-DPCCH, determine the SFE _-DPCCH value to actually use .

In the case where DPDCH is not established and HS-DPCCH is established for I channel (256, 1), E-DPCCH cannot be allocated (SFE _-DPCCH , 1) even if SFE _-DPCCH = 256. Therefore, the E-DPCCH cannot be allocated to the I channels (SFE _-DPCCH , 2) to (SFE _-DPCCH , _SFE-DPCCH /8). That is, allocating _{E-DPCCHs to I channels (SFE-DPCCH} , 2) to (SFE _-DPCCH , _SFE-DPCCH /8) is most efficient in achieving a low PAR value. Here, 32, 64, 128 and 256 are available for SFE _-DPCCH .

Referring to FIG. 4, the EUDCH transmission controller 402 transmits control information required for the Node B to receive the E-DPDCH through the E-DPCCH. In FIG. 4, c _{ch, SF, 1} represents the OVSF code for E-DPCCH, and is multiplied by the transmitted symbols so that the corresponding channel is orthogonal to other physical channels. In addition, like other physical channels, the transmission gain β _E-DPCCH of the E-DPCCH is set according to the rate of data transmitted by the UE or the required service quality level.

5. E-DPDCH

E-DPDCH, Dedicated Physical Data Channel for EUDCH service, transmits EUDCH packet data using a data rate determined based on scheduling information provided from Node B. E-DPDCH supports not only BPSK but also QPSK and 8PSK in order to increase the data rate while maintaining the number of spreading codes transmitted simultaneously.

As an example, returning to FIG. 4 , the E-DPDCH transmits two channels of E-DPDCH1 and E-DPDCH2 at the same time. Here, it is obvious that the number of E-DPDCH physical channels used depends on the transfer rate of EUDCH packet data. In addition, the EUDCH transmission controller 402 determines the number of E-DPDCH channels transmitted simultaneously and the SF value.

In other words, when the data rate is low, the E-DPDCH is spread using an OVSF code having a relatively large SF value so that it can be transmitted with one E-DPDCH. However, when the data rate is high, the SFE _-DPCCH value is set to 4 or 2, so that EUDCH packet data is transmitted through one or two E-DPDCH channels.

That is, the EUDCH packet transmitter 404 transmits EUDCH transmission data through the E-DPDCH1 under the control of the EUDCH transmission controller 402 . Optionally, even E-DPDCH2 is allocated for transmission if necessary. The EUDCH data buffer 400 is a buffer for storing EUDCH data to be transmitted. EUDCH data to be transmitted through the E-DPDCH channel is delivered to the EUDCH packet transmitter 404 under the control of the EUDCH transmission controller 402 .

Methods for allocating OVSF codes and I/Q channels for E-DPDCH according to several embodiments of the present invention will now be described.

first embodiment

The first embodiment proposes a method for allocating OVSF codes and I/Q channels for E-DPDCH regardless of DPDCH. The proposed method can reduce PAPR by properly adjusting the minimum spreading gain value of E-DPDCH and the number of transmission channels according to EUDCH data rate. Here, considering the SFE _-DPDCH set based on the data rate, the method will be divided into Method A, Method B, and Method C for convenience of description.

Method A corresponds to the case where the SF _E-DPDCH of E-DPDCH is set to 4 or greater.

1. An E-DPDCH channel is sent

E-DPDCH1 uses OVSF codes (SF _E-DPDCH , SF _E-DPDCH /2) to transmit EUDCH transmission symbols over a Q channel. Here, 4, 8, 16, 32, 64, 128 and 256 are available for SFE _-DPDCH . In FIG. 4, c _ed1 denotes an OVSF code for E-DPDCH1. The E-DPDCH1 to which the OVSF code is assigned in this way satisfies the orthogonality with other physical channels. That is, when E-DPDCH1 is transmitted on the Q channel, E-DPDCH1 may reduce its PAPR compared to DPDCH transmitted on the I channel.

2. Two E-DPDCH channels are sent

When the SF E _-DPDCH of E-DPDCH 1 and E-DPDCH 2 is 4, use OVSF code (4, 2) to spread E-DPDCH1 and E-DPDCH2, and then transmit them simultaneously through Q channel and I channel respectively. That is, E-DPDCH1 is assigned to the Q channel, and E-DPDCH2 is assigned to the I channel. Here, EUDCH packet data is transmitted using a modulation scheme having a 4th order or higher such as QPSK, 8PSK, and 16QAM.

和(±1，±1)的八种可能组合来发送通过E-DPDCH1和E-DPDCH2发送的码元。For example, symbols transmitted over E-DPDCH1 and E-DPDCH2 are transmitted in four possible combinations of (±1, ±1) when using QPSK modulation, and in four possible combinations when using 8PSK ,

Eight possible combinations of and (±1,±1) are used to transmit symbols transmitted over E-DPDCH1 and E-DPDCH2.

If the desired EUDCH data rate cannot be achieved even if both E-DPDCH 1 and E _- DPDCH 2 channels are transmitted simultaneously using SF _E-DPDCH = 4, it is possible to allow higher Data rate sent. That is, if the SF E _-DPDCH of E-DPDCH1 and E-DPDCH2 is 2, use the OVSF code (2, 1) to spread E-DPDCH1 and E-DPDCH2, and then transmit them simultaneously on the Q channel and I channel respectively they.

Compared to the case where the minimum spreading gain is 4, when several E-DPDCH physical channels need to be transmitted in this way, it is possible to significantly reduce the PAPR by reducing the number of transmitted E-DPDCH channels by half.

Method B is similar to method A above, but assigns the OVSF code such that the SF _E-DPDCH is set to a minimum of 2 when only E-DPDCH1 is transmitted.

1. An E-DPDCH channel is sent

When only E-DPDCH1 is transmitted, 2, 4, 8, 16, 32, 64, 128 and 256 are available for SF _E-DPDCH . E-DPDCH1 is allocated to the Q channel using OVSF codes (SF _E-DPDCH , SF _E-DPDCH /2).

2. Two E-DPDCH channels are sent

E-DPDCH1 and E-DPDCH2 are spread with OVSF code (2, 1) and then transmitted simultaneously on Q and I channels respectively. In this case, EUDCH packet data is transmitted using a modulation scheme having a 4th order or higher such as QPSK, 8PSK, and 16QAM.

Method C is similar to method A above, but assigns OVSF codes such that if the desired EUDCH data rate cannot be achieved even if both E-DPDCH1 and E-DPDCH2 channels are transmitted simultaneously using SF _E-DPDCH = 4, then the E-DPDCH will be used for E-DPDCH = 4 The SFE _-DPDCH for DPDCH1 is set to 2, and the SFE _-DPDCH for E-DPDCH2 is set to 4.

1. An E-DPDCH channel is sent

When SFE-DPDCH for E- _DPDCH is 4 or more, EUDCH transmission symbols are transmitted through a Q channel using OVSF codes (SFE _-DPDCH , _SFE-DPDCH /2). Here, 4, 8, 16, 32, 64, 128 and 256 are available for SFE _-DPCCH .

2. Two E-DPDCH channels are sent

When the SF _E-DPDCH for E-DPDCH1 and E-DPDCH2 is 4, spread E-DPDCH1 and E-DPDCH2 using OVSF code (4, 2), and then transmit them simultaneously through Q channel and I channel respectively. If the desired EUDCH data rate cannot be achieved even though both channels E-DPDCH1 and E-DPDCH2 are transmitted simultaneously, set the SF _E-DPDCH for E-DPDCH1 and the SF _E-DPDCH for E-DPDCH2 to be different value.

That is, when the SFE _-DPDCH for E-DPDCH1 is set to 2, and the SFE _-DPDCH for E-DPDCH2 is set to 4, then the data carried on the respective channels are independent before being transmitted. undergoes BPSK modulation. Therefore, the symbols transmitted on E-DPDCH1 and E-DPDCH 2 are spread using OVSF codes (2,1) and (4,2) on the Q channel and I channel, respectively, before transmission.

In addition, when the data rate cannot be achieved in the foregoing manner, the SFE _-DPDCH for E-DPDCH1 is set to 2, and the SFE _-DPDCH for E-DPDCH2 is set to 2 for transmission. That is, E-DPDCH2 and E-DPDCH1 are spread using OVSF code (2, 1), and then transmitted simultaneously on I and Q channels, respectively. In this case, EUDCH packet data can be transmitted using a modulation scheme having a 4th order or higher such as QPSK, 8PSK, and 16QAM.

Method D is a method for converting the OVSF code (4, 0) when the DPDCH and the HS-DPCCH are not transmitted, or when the HS-DPCCH is transmitted even if the OVSF code generated from 1) Allocated to additional E-DPDCH to increase EUDCH packet data rate. This is because the HS-DPCCH is sent only for HSDPA service. Additionally, this is because the DPDCH is only occasionally used for the transmission of signaling information when there is no data to be transmitted on the DPDCH, and may not be transmitted at other times. In WCDMA standards after Rel-5, there is a possibility that DPDCH is not established but only E-DPDCH is established.

1. Two or less E-DPDCH channels are sent

The aforementioned Method A, Method B, or Method C may be used.

2. Three E-DPDCH channels are sent

When the HS-DPCCH is not transmitted, the E-DPDCH3 channel is transmitted through the Q channel using the OVSF code (4, 1).

Optionally, when the HS-DPCCH is transmitted but not the DPDCH, the E-DPDCH3 channel is transmitted through the I channel using the OVSF code (4, 1).

3. Four or more E-DPDCH channels are sent

Both the I channel and the Q channel use the OVSF code (4, 1) for transmission. OVSF code (4, 1) is applied when it is not used by DPDCH and HS-DPCCH.

In other words, when neither the HS-DPCCH nor the DPDCH is transmitted, the third and fourth E-DPDCH channels are transmitted through the I channel and the Q channel, respectively, using the OVSF code (4, 1). Even when DPDCH is not established and HS-DPCCH is transmitted using OVSF code generated from OVSF code (4, 0), OVSF code (4, 1) is never used in I and Q channels. Therefore, it is possible to transmit the third and fourth E-DPDCH channels on the I/Q channel using the OVSF code (4,1).

second embodiment

The second embodiment proposes a method for applying OVSF codes of E-DPDCH and I/Q channel allocation rules differently considering establishment/non-establishment of HS-DPCCH.

The second embodiment provides a method for first allocating E-DPDCH to I channel when setting HS-DPCCH in Q channel for OVSF code (256, 64), thereby reducing PAPR. The advantage of the second embodiment is that it can significantly reduce PAPR when HS-DPCCH has higher power than DPDCH because UE is located near the cell border.

When HS-DPCCH is not established, OVSF codes are allocated in the following method.

1. An E-DPDCH is sent

E-DPDCH transmits EUDCH transmit symbols on the Q channel using OVSF codes (SFE _-DPDCH , SFE _-DPDCH /4). Here, 4, 8, 16, 32, 64, 128, 256 and 512 are available for SFE _-DPDCH .

If the EUDCH data rate cannot be fully achieved even with SF _E-DPDCH = 4, E-DPDCH uses the OVSF code (2, 1) with SF _E-DPDCH = 2 on the Q channel instead of its OVSF code (SF _E-DPDCH , SF _E-DPDCH /4).

2. Two E-DPDCHs are sent

When SF _E-DPDCH for E-DPDCH is set to 2, E-DPDCH1 is sent on the Q channel using OVSF code (2, 1) and E-DPDCH1 is sent on the I channel using OVSF code (2, 1). DPDCH2.

Optionally, E-DPDCH1 is sent on the Q channel using OVSF code (2,1) and E-DPDCH2 is sent on the I channel using OVSF code (4,2). In this case, if the desired EUDCH data rate cannot be achieved, set SFE _E-DPDCH for E-DPDCH2 to 2 and use OVSF code (2, 1) instead of OVSF code (4, 2) for Send E-DPDCH2.

3. Three E-DPDCHs are sent

When E-DPDCH1 is sent on the Q channel with OVSF code (2, 1) and E-DPDCH2 is sent on the I channel with OVSF code (2, 1), it is sent on the Q channel with OVSF code (4, 1) E-DPDCH3.

4. Four E-DPDCHs are sent

E-DPDCH4 is transmitted on the I channel using OVSF code (4,1).

Here, the case that the OVSF code (4, 1) can be used on both the I channel and the Q channel corresponds to the case that the OVSF code (4, 1) is not used by the DPDCH and the HS-DPCCH. That is, if DPDCH is not established, or even if DPDCH is established but DPDCH is equal to E-DPDCH in radio frame length, in the transmission time interval (TTI) when DPDCH is not transmitted, except for E-DPDCH1, E - In addition to DPDCH2 and E-DPDCH3, E-DPDCH4 is transmitted on I channel using OVSF code (4,1).

However, when the HS-DPCCH is set with (Q, 256, 64), the OVSF code allocation method is as follows.

1. An E-DPDCH is sent

E-DPDCH1 transmits EUDCH transmit symbols on the I channel using OVSF codes (SF _E-DPDCH , SF _E-DPDCH /2). Here, 2, 4, 8, 16, 32, 64, 128, 256 and 512 are available for SFE _-DPDCH .

2. Two E-DPDCHs are sent

E-DPDCH1 is sent on the I channel using OVSF code (2,1) and E-DPDCH2 is also sent on the Q channel using OVSF code (2,1).

third embodiment

When the HS-DPCCH is not established, the third embodiment uses the same OVSF code allocation method as the second embodiment. However, the third embodiment is characterized in that it first assigns the E-DPDCH to the Q channel instead of setting the I channel of the HS-DPCCH with (Q, 256, 64).

When the HS-DPCCH is not established, the third embodiment uses the same OVSF code allocation method as the second embodiment.

However, when setting the HS-DPCCH with (Q, 256, 64), the following OVSF code allocation method is used.

1. An E-DPDCH is sent

E-DPDCH1 is used on the Q channel (SFE _-DPDCH , SFE _-DPDCH /2), and 2, 4, 8, 16, 32, 64, 128, 256 and 512 are available for SFE _-DPDCH .

2. Two E-DPDCHs are sent

When SF _E-DPDCH for E-DPDCH is set to 2, E-DPDCH1 is sent on the Q channel using OVSF code (2, 1) and E-DPDCH1 is sent on the I channel using OVSF code (2, 1). DPDCH2.

Optionally, E-DPDCH1 is sent on the Q channel using OVSF code (2,1) and E-DPDCH2 is sent on the I channel using OVSF code (4,2). In this case, if the desired EUDCH data rate cannot be achieved, set SFE _E-DPDCH for E-DPDCH2 to 2 and use OVSF code (2, 1) instead of OVSF code (4, 2) for Send E-DPDCH2.

3. Three E-DPDCHs are sent

In the case where DPDCH is not established, or in the case where DPDCH is equal to E-DPDCH in radio frame length even though DPDCH is established, within the TTI where no DPDCH is transmitted on I channel, except using OVSF code (2, 1) in In addition to E-DPDCH1 and E-DPDCH2 transmitted on I and Q channels, E-DPDCH3 is transmitted on Q channel using OVSF code (4,1).

Fourth embodiment

The fourth embodiment proposes a method for setting the HS-DPCCH on the Q channel with the OVSF code (256, 64), for the case where the DPDCH is not established, or even if the DPDCH is established but the E-DPDCH In case of radio frame length equal to DPDCH, PAPR is reduced and OVSF codes are used efficiently. The I/Q channel and OVSF code allocation method for E-DPDCH vary according to the presence/absence of DPDCH transmitted within the current TTI.

1. An E-DPDCH is sent

When sending DPDCH in the current TTI, E-DPDCH1 is used on the Q channel (SFE _-DPDCH , SFE _-DPDCH /2), and 2, 4, 8, 16, 32, 64, 128, 256 and 512 Available for SF _E-DPDCH .

However, when no DPDCH is transmitted in the current TTI, the OVSF codes (SFE _-DPDCH , _SFE-DPDCH /4) are used on the I channel, and 4, 8, 16, 32, 64, 128, 256, and 512 Available for SF _E-DPDCH . In this case, to further increase the EUDCH data rate, the E-DPDCH is transmitted using the OVSF code (2, 1) instead of the OVSF code (SFE _-DPDCH , _SFE-DPDCH /4).

2. Two E-DPDCHs are sent

When SF _E-DPDCH for E-DPDCH is set to 2, E-DPDCH1 is sent on the Q channel using OVSF code (2, 1) and E-DPDCH1 is sent on the I channel using OVSF code (2, 1). DPDCH2.

Optionally, E-DPDCH1 is sent on the Q channel using OVSF code (2,1) and E-DPDCH2 is sent on the I channel using OVSF code (4,2). In this case, if the desired EUDCH data rate cannot be achieved, set SFE _E-DPDCH for E-DPDCH2 to 2 and use OVSF code (2, 1) instead of OVSF code (4, 2) for Send E-DPDCH2.

3. Three E-DPDCHs are sent

In addition to E-DPDCH1 and E-DPDCH2 sent on Q and I channels using OVSF code (2, 1), when no DPDCH is sent in the current TTI, sent on I channel using OVSF code (4, 1) E-DPDCH.

fifth embodiment

The fifth embodiment proposes a method for allocating E-DPDCH when DPDCH is not established. For E-DPDCH, the fifth embodiment has the basic concept of allocating E-DPDCH1 to the opposite I/Q channel of the I/Q channel on which the HS-DPDCH is transmitted, and can be used in the channel gain factor for HS-DPCCH High reduces PAPR.

When the HS-DPCCH is not established, the E-DPDCH allocation method is as follows.

1. An E-DPDCH is sent

E-DPDCH1 transmits EUDCH transmit symbols on the I channel using OVSF codes (SF _E-DPDCH , SF _E-DPDCH /4). Here, 4, 8, 16, 32, 64, 128, 256 and 512 are available for SFE _-DPDCH . In this case, if the EUDCH data rate cannot be fully achieved even with SFE _-DPDCH set to 4, set SFE _-DPDCH to 2 and use OVSF code (2, 1) instead of OVSF code (SF _E-DPDCH , SF _E-DPDCH /4) Send EUDCH transmission symbols on the I channel.

2. Two E-DPDCHs are sent

E-DPDCH1 is sent on the I channel using OVSF code (2,1) and E-DPDCH2 is sent on the Q channel using OVSF code (2,1).

3. Three or more E-DPDCHs are sent

In addition to E-DPDCH 1 and E-DPDCH2, E-DPDCH3 and E-DPDCH4 use the OVSF code (4, 1) to transmit EUDCH transmission symbols on the I and Q channels.

However, when the DPDCH is not established but the HS-DPCCH is established, it is likely that the HS-DPCCH is allocated to the I channel.

1. An E-DPDCH is sent

E-DPDCH transmits EUDCH transmit symbols on the Q channel using OVSF codes (SFE _-DPDCH , SFE _-DPDCH /4). Here, 4, 8, 16, 32, 64, 128, 256 and 512 are available for SFE _-DPDCH . If the EUDCH data rate cannot be fully realized even with SF _E-DPDCH = 4, then SF is set to 2 and the Q channel uses OVSF code (2, 1).

2. Two E-DPDCHs are sent

E-DPDCH1 is sent on the Q channel using OVSF code (2,1) and E-DPDCH2 is sent on the I channel using OVSF code (2,1).

3. Three or more E-DPDCHs are sent

In addition to E-DPDCH1 and E-DPDCH2 transmitted on Q and I channels using OVSF code (2, 1), E-DPDCH3 and E-DPDCH4 additionally use OVSF code (4, 1) on I and Q channels Send EUDCH transmit symbols.

Returning to FIG. 4 , the EUDCH transmission controller 402 transmits the UE data buffer status and CSI required for the scheduling control of the Node B to the Node B through the E-DPCCH. EUDCH transmission controller 402 determines E-TFRI, and transmits the determined E-TFRI to Node B through E-DPCCH. E-TFRI is determined using the maximum possible data rate.

The EUDCH packet transmitter 404 receives packet data determined based on the E-TFRI from the EUDCH data buffer 400 . The received packet data undergoes channel coding and modulation using E-TFRI, and then is transmitted to Node B through E-DPDCH1 and E-DPDCH2 channels according to an embodiment of the present invention.

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

The OVSF code c _{ch, SE1} (SF _E-DPCCH , 1) is used in the multiplier 406 to spread the control information on the E-DPCCH at the chip rate to maintain the orthogonality with other physical channels. Thereafter, the output of multiplier 406 is multiplied by the channel gain β _ec in multiplier 408 . The E-DPCCH control information multiplied by the channel gain β _sc is input to the summer 426 .

Packet data provided from EUDCH packet transmitter 404 is converted into a composite symbol stream I+jQ, which is then passed to multiplier 446 and multiplier 416 as I and Q channel components, respectively. Multiplier 446 spreads the packet data into I channel components of modulation symbols at the chip rate with OVSF code C _ed2 . In a multiplier 448, the output of the multiplier 446 is multiplied by the channel gain β _ed2 . The summer 426 forms an I channel by summing DPDCH data, E-DPCCH control information, and E-DPDCH2 data.

In multiplier 428, the control information on the DPCCH is spread at the chip rate using the OVSF code (256, 0), ie, c _{ch, 256} , 0 , and then multiplied by the channel gain β _c in multiplier 430 . The DPCCH control information multiplied by the channel gain β _c is input to the summer 436 .

In the multiplier 432, the control information on the HS-DPCCH is spread at the chip rate using the OVSF code (256, 64), namely c _{ch, 256, 64} , and then multiplied by the channel gain β _hs in the multiplier 434 .

In multiplier 416, the Q-channel component of the EUDCH packet data modulation symbols provided from EUDCH packet transmitter 404 is spread at the chip rate using the OVSF code _Ced1 . In multiplier 418, the output of multiplier 416 is multiplied by channel gain β _ed1 . The summer 436 forms a Q channel by summing DPCCH control information, HS-DPCCH control information, and E-DPDCH1 data. The output of summer 436 is multiplied by an imaginary number in multiplier 438 before being passed to summer 440 .

Summer 440 forms a composite symbol stream by summing the output of summer 426 and the output of multiplier 438 and passes the composite symbol stream to multiplier 450 . Multiplier 450 scrambles the composite symbol stream using a scrambling code S _dpch,1 . The pulse shaping filter 452 converts the scrambled composite symbol stream into a pulsed signal, which is then passed to the Node B by the RF module 454 via the antenna 456 .

FIG. 5 is a diagram illustrating a comparison between physical channels according to the PAPR reduction effect of FIG. 4 .

In FIG. 5, reference numeral 40 denotes a case of using the method proposed by the present invention, and reference numerals 41 and 42 denote cases of allocating different OVSF codes or different I/Q channels for E-DPCCH. Here, the PAPR result is obtained by simulation using the transmit pulse shaping filter 452 and scrambling code specified in the Rel-5 WCDMA standard, and the channel gain β is generally set under the discussion of EUDCH technology.

Referring to FIG. 5 , the case 40 proposed by the present invention is about 0.7 dB better than the case 41 in terms of PAPR reduction effect. In addition, according to the PAPR reduction effect, the case 40 proposed by the present invention is about 0.12dB better than the case 42. That is, the proposed OVSF code and I/Q channel allocation method for E-DPCCH and E-DPDCH can achieve relatively low PAPR.

OVSF codes and I/Q channel allocation methods for E-DPCCH and E-DPDCH according to sixth to ninth embodiments will now be described, which maintain compatibility with existing Rel-5 standards and transmit at least one DPDCH When , consider the transmission/non-transmission of the HS-DPCCH.

Sixth embodiment

1. One or more DPDCHs can be sent and HS-DPCCH is not sent

Table 1 shows a method of allocating I/Q channels and OVSF codes for DPCCH and DPDCH according to the current standard.

Table 1

channel distribute DPCCH (Q, 256, 0) DPDCH (I, SF, SF/4)

That is, the DPCCH channel is transmitted on the Q channel using the OVSF code (256, 0), and the DPDCH can be assigned to the I channel using the OVSF code (SF _DPDCH , SF _DPDCH /4). Here, 4, 8, 16, 32, 64, 128, 256 and 512 are available for SF _DPDCH .

Table 2 shows a method of allocating I/Q channels and OVSF codes for E-DPCCH and E-DPDCH in consideration of compatibility with the current standard of Table 1 in the present invention.

Table 2

channel distribute E-DPCCH (I, SFE _-DPCCH , 1) E-DPDCH1, E-DPDCH2, E-DPDCH3, E-DPDCH4, E-DPDCH5 (Q, SF, SF/4), (I, 4, 3)(Q, 4, 3), (I, 4, 2)(Q, 4, 2)

Here, 8, 16, 32, 64, 128 and 256 are available for SF _E-DPCCH of E-DPCCH, and 4, 8, 16, 32, 64, 128, 256 and 512 for _SF E-DPCCH of E-DPDCH _DPDCH is available.

As shown in Table 2, if a maximum of 5 E-DPDCH channels can be transmitted, and SF=4 is applied to E-DPDCH1, E-DPDCH1 is transmitted on Q channel using OVSF code (4, 1), and OVSF code is used (4,3) Send E-DPDCH2 on I channel. In addition, E-DPDCH3 is transmitted on the Q channel using OVSF code (4,3) and E-DPDCH4 is transmitted on the I channel using OVSF code (4,2). Finally, E-DPDCH5 is transmitted on the Q channel using OVSF code (4,2).

2. One or more DPDCHs can be sent and HS-DPCCH is sent

Table 3 shows a method of allocating I/Q channels and OVSF codes for DPCCH, DPDCH and HS-DPCCH according to the current standard.

table 3

channel distribute DPCCH (Q, 256, 0) DPDCH (I, SF, SF/4) HS-DPCCH (Q, 256, 64)

Table 4 shows a method of allocating I/Q channels and OVSF codes for E-DPCCH and E-DPDCH in consideration of compatibility with the current standard of Table 3 in the present invention.

Table 4

channel distribute E-DPCCH (I, SFE _-DPCCH , 1) E-DPDCH1, E-DPDCH2, E-DPDCH3, E-DPDCH4 (Q, SF, SF/4+SF/2), (I, 4, 3)(Q, 4, 2), (I, 4, 2)

Here, 8, 16, 32, 64, 128 and 256 are available for SF _E-DPCCH of E-DPCCH, and 4, 8, 16, 32, 64, 128, 256 and 512 for _SF E-DPCCH of E-DPDCH _DPDCH is available.

In this case, if a maximum of 4 E-DPDCH channels can be sent and SF _E-DPDCH = 4 is used, then E-DPDCH1 and E-DPDCH2 are assigned (Q, 4, 3) and (1, 4, 3). E-DPDCH3 is sent on the Q channel using OVSF code (4,2) and E-DPDCH4 is sent on the I channel using OVSF code (4,2).

3. A maximum of 2 DPDCHs can be sent and HS-DPCCH is not sent

Table 5 shows a method of allocating I/Q channels and OVSF codes for DPCCH and DPDCH according to the current standard.

table 5

channel distribute DPCCH (Q, 256, 0)

DPDCH1, DPDCH2 (I, SF, SF/4), (Q, 4, 1)

Table 6 shows a method of allocating I/Q channels and OVSF codes for E-DPCCH and E-DPDCH in consideration of compatibility with the current standard of Table 5 in the present invention.

Table 6

channel distribute E-DPCCH (I, SFE _-DPCCH , 1) E-DPDCH1, E-DPDCH2, E-DPDCH3, E-DPDCH4 (Q, SF, SF/4+SF/2), (I, 4, 3)(Q, 4, 2), (I, 4, 2)

Here, 8, 16, 32, 64, 128 and 256 are available for SF _E-DPCCH of E-DPCCH, and 4, 8, 16, 32, 64, 128, 256 and 512 for _SF E-DPCCH of E-DPDCH _DPDCH is available.

In this case, if a maximum of 4 E-DPDCH channels can be transmitted and SFE _-DPDCH = 4 is used, then E-DPDCH1 and E-DPDCH1 and E- DPDCH2. E-DPDCH3 is sent on the Q channel using OVSF code (4,2) and E-DPDCH4 is sent on the I channel using OVSF code (4,2).

4. A maximum of 2 DPDCHs can be sent and HS-DPCCH is sent

Table 7 shows a method of allocating I/Q channels and OVSF codes for DPCCH, DPDCH and HS-DPCCH according to the current standard.

Table 7

channel distribute DPCCH (Q, 256, 0) DPDCH (I, SF, SF/4) HS-DPCCH (Q, 256, 64)

Table 8 shows a method of allocating I/Q channels and OVSF codes for E-DPCCH and E-DPDCH in consideration of compatibility with the current standard of Table 7 in the present invention.

Table 8

channel distribute E-DPCCH (Q, SF _E-DPCCH , SF _E-DPCCH /8) E-DPDCH1, E-DPDCH2, E-DPDCH3, E-DPDCH4 (I, SF, SF/4+SF/2), (Q, 4, 8)(I, 4, 2), (Q, 4, 2)

Here, 64, 128, and 256 are available for SFE _-DPCCH of E-DPCCH, and 4, 8, 16, 32, 64, 128, 256, and 512 are available for SFE _-DPDCH of E-DPDCH.

In this case, if a maximum of 4 E-DPDCH channels can be transmitted and SF=4 is used, E-DPDCH1 and E-DPDCH2 are allocated (I, 4, 3) and (Q, 4, 3), respectively. E-DPDCH3 is sent on the I channel using OVSF code (4,2) and E-DPDCH4 is sent on the Q channel using OVSF code (4,2).

5. A maximum of 3 DPDCHs can be sent and HS-DPCCH is not sent

Table 9 shows a method of allocating I/Q channels and OVSF codes for DPCCH and DPDCH according to the current standard.

Table 9

channel distribute DPCCH (Q, 256, 0) DPDCH1, DPDCH2, DPDCH3 (I, SF, SF/4), (Q, 4, 1)(I, 4, 3)

Table 10 shows a method of allocating I/Q channels and OVSF codes for E-DPCCH and E-DPDCH in consideration of compatibility with the current standard of Table 9 in the present invention.

Table 10

channel distribute E-DPCCH (I, SFE _-DPCCH , 1) E-DPDCH1, E-DPDCH2, E-DPDCH3 (Q, SF, SF/4+SF/2), (I, 4, 2)(Q, 4, 2)

Here, 8, 16, 32, 64, 128 and 256 are available for SF _E-DPCCH of E-DPCCH, and 4, 8, 16, 32, 64, 128, 256 and 512 for _SF E-DPCCH of E-DPDCH _DPDCH is available.

In this case, if a maximum of 3 E-DPDCH channels can be transmitted and SF=4 is used, E-DPDCH1 is transmitted on the Q channel using OVSF code (4,3). E-DPDCH2 is sent on the I channel using OVSF code (4,2) and E-DPDCH3 is sent on the Q channel using OVSF code (4,2).

6. A maximum of 3 DPDCHs can be sent and HS-DPCCH is sent

Table 11 shows a method of allocating I/Q channels and OVSF codes for DPCCH, DPDCH, and HS-DPCCH according to the current standard.

Table 11

channel distribute DPCCH (Q, 256, 0) DPDCH1, DPDCH2, DPDCH3 (I, SF, SF/4), (Q, 4, 1)(I, 4, 3) HS-DPCCH (Q, 256, 32)

Table 12 shows a method of allocating I/Q channels and OVSF codes for E-DPCCH and E-DPDCH in consideration of compatibility with the current standard of Table 11 in the present invention.

Table 12

channel distribute E-DPCCH (I, SFE _-DPCCH , 1) E-DPDCH1, E-DPDCH2, E-DPDCH3 (Q, SF, SF/4+SF/2), (I, 4, 2)(Q, 4, 2)

Here, 8, 16, 32, 64, 128 and 256 are available for SF _E-DPCCH of E-DPCCH, and 4, 8, 16, 32, 64, 128, 256 and 512 for _SF E-DPCCH of E-DPDCH _DPDCH is available.

In this case, if a maximum of 3 E-DPDCH channels can be transmitted and SF=4 is used, E-DPDCH1 is transmitted on the Q channel using OVSF code (4,3). E-DPDCH2 is sent on the I channel using OVSF code (4,2) and E-DPDCH3 is sent on the Q channel using OVSF code (4,2).

7. A maximum of 4 DPDCHs can be sent and HS-DPCCH is not sent

Table 13 shows a method of allocating I/Q channels and OVSF codes for DPCCH and DPDCH according to the current standard.

Table 13

channel distribute DPCCH (Q, 256, 0) DPDCH1, DPDCH2, DPDCH3, DPDCH4 (I, SF, SF/4), (Q, 4, 1) (I, 4, 3), (Q, 4, 3)

Table 14 shows a method of allocating I/Q channels and OVSF codes for E-DPCCH and E-DPDCH in consideration of compatibility with the current standard of Table 13 in the present invention.

Table 14

channel distribute

E-DPCCH (I, SFE _-DPCCH , 1) E-DPDCH1, E-DPDCH2 (I, SF, SF/2), (Q, 4, 2)

Here, 8, 16, 32, 64, 128 and 256 are available for SF _E-DPCCH of E-DPCCH, and 4, 8, 16, 32, 64, 128, 256 and 512 for _SF E-DPCCH of E-DPDCH _DPDCH is available.

In this case, if a maximum of 2 E-DPDCH channels can be sent and SF=4 is used, then E-DPDCH1 is sent on I channel using OVSF code (4, 2) and in E-DPDCH2 is sent on the Q channel.

8. A maximum of 4 DPDCHs can be sent and HS-DPCCH is sent

Table 15 shows a method of allocating I/Q channels and OVSF codes for DPCCH and DPDCH according to the current standard.

Table 15

channel distribute DPCCH (Q, 256, 0) DPDCH1, DPDCH2, DPDCH3, DPDCH4 (I, SF, SF/4), (Q, 4, 1) (I, 4, 3), (Q, 4, 3) HS-DPCCH (I, 256, 1)

Table 16 shows a method of allocating I/Q channels and OVSF codes for E-DPCCH and E-DPDCH in consideration of compatibility with the current standard of Table 15 in the present invention.

Table 16

channel distribute E-DPCCH (Q, SF _E-DPCCH , SF _E-DPCCH /8) E-DPDCH1, E-DPDCH2 (I, SF, SF/2), (Q, 4, 2)

Here, 64, 128, and 256 are available for SFE _-DPCCH of E-DPCCH, and 4, 8, 16, 32, 64, 128, 256, and 512 are available for SFE _-DPDCH of E-DPDCH.

In this case, if a maximum of 2 E-DPDCH channels can be sent and SF=4 is used, then E-DPDCH1 is sent on I channel using OVSF code (4, 2) and in E-DPDCH2 is sent on the Q channel.

9. A maximum of 5 DPDCHs can be sent and HS-DPCCH is not sent

Table 17 shows a method of allocating I/Q channels and OVSF codes for DPCCH and DPDCH according to the current standard.

Table 17

channel distribute DPCCH (Q, 256, 0) DPDCH1, DPDCH2, DPDCH3, DPDCH4, DPDCH5 (I, SF, SF/4), (Q, 4, 1) (I, 4, 3), (Q, 4, 3) (I, 4, 2)

Table 18 shows a method of allocating I/Q channels and OVSF codes for E-DPCCH and E-DPDCH in consideration of compatibility with the current standard of Table 17 in the present invention.

Table 18

channel distribute E-DPCCH (I, SFE _-DPCCH , 1) E-DPDCH1 (Q, SF, SF/2)

Here, 8, 16, 32, 64, 128 and 256 are available for SF _E-DPCCH for E-DPCCH, and 8, 16, 32, 64, 128, 256 and 512 are available for _SF E-DPCCH for E-DPDCH _DPDCH is available. A maximum of only one E-DPDCH can be transmitted. E-DPDCH1 is transmitted on the Q channel using OVSF code (4,2).

10. A maximum of 5 DPDCHs can be sent and HS-DPCCH is sent

Table 19 shows a method of allocating I/Q channels and OVSF codes for DPCCH and DPDCH according to the current standard.

Table 19

channel distribute DPCCH (Q, 256, 0) DPDCH1, DPDCH2, DPDCH3, DPDCH4, DPDCH5 (I, SF, SF/4), (Q, 4, 1) (I, 4, 3), (Q, 4, 3) (I, 4, 2) HS-DPCCH (Q, 256, 32)

Table 20 shows a method of allocating I/Q channels and OVSF codes for E-DPCCH and E-DPDCH in consideration of compatibility with the current standard of Table 19 in the present invention.

Table 20

channel distribute E-DPCCH (I, SFE _-DPCCH , 1) E-DPDCH1, E-DPDCH2 (Q, SF, SF/2)

Here, 8, 16, 32, 64, 128, and 256 are available for SF _E-DPCCH of E-DPCCH, and only one E-DPDCH can be transmitted at most. E-DPDCH1 is transmitted on the Q channel using OVSF code (4,2).

Seventh embodiment

Compared with the sixth embodiment, the seventh embodiment proposes an allocation rule which is similar in the group compensation required in the RF power amplifier, but simpler in implementation. The method of allocating I/Q channels and OVSF codes for E-DPCCH and E-DPDCH is determined based on the maximum number of DPDCHs that can be transmitted and the transmission/non-transmission of HS-DPCCH, and the basic rules are as follows:

E-DPCCH: If the maximum number of transmittable DPDCHs is 2 or 4, and HS-DPCCH is allocated (1, 256, 1), then it uses (Q, SFE _-DPCCH , SFE _-DPCCH /8), And in other cases, it uses (I, SFE _-DPCCH , 1).

E-DPDCH: When several DPDCH channels are transmitted, the DPDCH is transmitted in (I, 4, 1), (Q, 4, 1), (I, 4, 3), (Q, 4, 3), (I The order of , 4, 2) and (Q, 4, 2) uses the OVSF code. Therefore, the E-DPDCH additionally uses the remaining codes among the six codes except for the codes set for DPDCH transmission in the arranged order according to the EUDCH packet data rate.

In the stand-alone case where only EUDCH is transmitted, HSDPA uses the OVSF code (256, 1) on the I channel, and in the case of establishing DPDCH, HSDPA follows the Rel-5 standard.

Most preferably, E-DPCCH and E-DPDCH are assigned I/Q channels and OVSF codes in the aforementioned manner according to PAPR.

1. HS-DPCCH is not established and EUDCH is independent

The E-DPCCH is always used (I, SF _E-DPCCH , 1). Here, 8, 16, 32, 64, 128 and 256 are available for SFE _-DPCCH .

As shown in Table 21, according to the maximum number of transmittable DPDCHs, I/Q channels and OVSF codes are allocated for E-DPDCHs.

Table 21

Maximum number of DPDCHs that can be sent Maximum number of E-DPDCHs that can be sent E-DPDCH allocation order 0 6 (I, SF, SF/4), (Q, 4, 1), (I, 4, 3), (Q, 4, 3), (I, 4, 2), (Q, 4, 2) 1 5 (Q, SF, SF/4), (I, 4, 3), (Q, 4, 3), (I, 4, 2), (Q, 4, 2) 2 4 (I, SF, SF/2+SF/4), (Q, 4, 3), (I, 4, 2), (Q, 4, 2) 3 3 (Q, SF, SF/2+SF/4), (I, 4, 2)(Q, 4, 2) 4 2 (I, SF, SF/2), (Q, 4, 2) 5 1 (Q, SF, SF/2)

In Table 21, 4, 8, 16, 32, 64, 128, 256 and 512 are available for SF. In Table 21, if the maximum number of transmittable DPDCHs is 0, E-DPDCH transmitting EUDCH data can use maximum 6 codes.

For example, when all six channels are used according to the EUDCH data rate, E-DPDCH1 is sent on the I channel using OVSF code (4,1) and E-DPDCH2 is sent on the Q channel using OVSF code (4,1). E-DPDCH3 is sent on the I channel using OVSF code (4,3) and E-DPDCH4 is sent on the Q channel using OVSF code (4,3). E-DPDCH5 is sent on the I channel using OVSF code (4,2) and E-DPDCH6 is sent on the Q channel using OVSF code (4,2).

As another example, if the maximum number of transmittable DPDCHs is 4 in Table 21, E-DPDCH for transmitting EUDCH data may use maximum 2 codes. For E-DPDCH, E-DPDCH1 is sent on the I channel using the OVSF code (SF, SF/2) and the additionally allocated E-DPDCH2 is sent on the Q channel using the OVSF code (4, 2).

2. A maximum of 1 DPDCH can be sent and HS-DPCCH is allocated (Q, 256, 64)

E-DPCCH always uses (I, SF _E-DPCCH , 1). Here, 8, 16, 32, 64, 128 and 256 are available for SFE _-DPCCH .

According to the EUDCH data rate, the E-DPDCH is sequentially assigned four OVSF codes (I, SF, SF/2+SF/4), (Q, 4, 3), (I, 4, 2) and (Q, 4 ,2). Here, 4, 8, 16, 32, 64, 128, 256 and 512 are available for SF. Since HS-DPCCH is allocated on Q channel (Q, 256, 64), OVSF code (4, 1) is difficult to use for E-DPDCH.

3. A maximum of 2 DPDCHs can be sent and HS-DPCCH is established

As shown in Table 22, the E-DPCCH is assigned I/Q channels and OVSF codes according to the maximum number of transmittable DPDCHs.

Table 22

The maximum number of DPDCHs that can be sent E-DPCCH allocation 1, 3, 5 (I, SFE _-DPCCH , 1) 2, 4 (Q, SF _E-DPCCH , SF _E-DPCCH /8)

In this case, if the maximum number of transmittable DPDCHs is 2 or 4, and HS-DPCCH is allocated (1, 256, 1), then E-DPCCH uses (Q, SF _E-DPCCH , SF _E-DPCCH /8). Here, 64, 128 and 256 are available for SFE _-DPCCH .

However, E-DPDCH is allocated I/Q channel and OVSF code as shown in Table 21 according to the maximum number of transmittable DPDCHs.

Eighth embodiment

The eighth embodiment has the basic principle that firstly assigns E-DPDCH to Q channel with OVSF code having the same index, and additionally assigns E-DPDCH to I channel. In this case, the code used for the E-DPDCH is determined according to the maximum number of transmittable DPDCHs and transmission/non-transmission of the HS-DPCCH.

That is, according to the eighth embodiment, the DPDCH is allocated to the I channel first, and the E-DPDCH is allocated to the Q channel first, so that the numbers of DPDCH and E-DPDCH transmitted on the I/Q channel can be equal to each other. In other words, when the HS-DPCCH is transmitted on the Q channel using the OVSF code (256, 64), or the number of DPDCHs is less than the maximum number of DPDCHs that can be transmitted, the eighth embodiment can prevent - Excessive increase of PAPR caused by the advantage of DPDCH.

However, when using the aforementioned OVSF code and I/Q channel allocation rules for E-DPDCH, using (SF, 1) on the I channel compared to DPCCH using the OVSF code (256, 0) on the Q channel E-DPDCH is transmitted so as to minimize the increase in PAPR. Here, 4, 8, 16, 32, 64 and 128 are available for SF. HSDPA uses the OVSF code (256, 1) on the I channel in the stand-alone case and follows the Rel-5 standard in case the DPDCH is established. According to PAPR, it is most preferable to assign OVSF codes in the aforementioned manner.

1. HS-DPCCH is not established and EUDCH is independent

According to the maximum number of DPDCHs that can be transmitted, E-DPDCHs are assigned I/Q channels and OVSF codes as shown in Table 23.

Table 23

Maximum number of DPDCHs that can be sent Maximum number of E-DPDCHs that can be sent E-DPDCH allocation order 0 6 (Q, SF, SF/4), (I, 4, 1), (Q, 4, 3), (I, 4, 3), (Q, 4, 2), (I, 4, 2) 1 5 (Q, SF, SF/4), (Q, 4, 3), (I, 4, 3), (Q, 4, 2), (I, 4, 2) 2 4 (Q, SF, SF/2+SF/4), (I, 4, 3), (Q, 4, 2), (I, 4, 2) 3 3 (Q, SF, SF/2+SF/4), (Q, 4, 2)(I, 4, 2) 4 2 (Q, SF, SF/2), (I, 4, 2) 5 1 (I, SF, SF/2)

In Table 23, 4, 8, 16, 32, 64, 128, 256 and 512 are available for SF. In Table 23, if the maximum number of transmittable DPDCHs is 0, maximum 6 E-DPDCH channels can be transmitted. In this case, according to the number of transmitted E-DPDCH channels, (Q, SF, SF/4), (I, 4, 1), (Q, 4, 3), (I, 4, 3 ), (Q, 4, 2) and (1, 4, 2) in sequence using the OVSF code.

However, if the maximum number of transmittable DPDCHs is 1, maximum 5 codes can be used for E-DPDCH channels transmitting EUDCH data, so that maximum 5 E-DPDCH channels can be transmitted. In this case, according to the number of transmitted E-DPDCH channels, (Q, SF, SF/4), (Q, 4, 3), (I, 4, 3), (Q, 4, 2 ) and (1,4,2) in sequence, using the OVSF code.

As another example, if the maximum number of transmittable DPDCHs is 4 in Table 23, a maximum of 2 codes can be used for E-DPDCH. In this case, when only one E-DPDCH is transmitted, the E-DPDCH is transmitted on the Q channel using the OVSF code (SF, SF/2) and on the I channel using the OVSF code (4, 2) when necessary Additional allocated E-DPDCH.

2. A maximum of 1 DPDCH can be sent and HS-DPCCH is allocated (Q, 256, 64)

According to the EUDCH data rate, the E-DPDCH is sequentially assigned four OVSF codes (Q, SF, SF/2+SF/4), (I, 4, 3), (Q, 4, 2) and (I, 4 ,2). Here, 4, 8, 16, 32, 64, 128, 256 and 512 are available for SF.

For example, when only one E-DPDCH is transmitted, the E-DPDCH is transmitted on the Q channel using the OVSF code (SF, SF/2+SF/4). This prevents excessive PAPR increase due to dominance of the physical data channel on one of the I and Q channels. Therefore, DPDCH is transmitted on the I channel and E-DPDCH is transmitted on the Q channel so that the number of physical data channels transmitted on the I channel is equal to the number of physical data channels transmitted on the Q channel, thereby preventing an increase in PAPR .

3. A maximum of 2 DPDCHs can be sent and HS-DPCCH is established

Use the same code assignment rules as shown in Table 23.

Ninth embodiment

When several E-DPDCH physical channels are transmitted, the SF=2OVSF code is exceptionally used for E-DPDCH only in the following case in order to further reduce PAPR.

For example, when (1, 4, 3) and (1, 4, 2) are allocated to E-DPDCH at the same time for multi-code transmission on E-DPDCH, use (1, 2, 1) instead of the aforementioned two codes Send E-DPDCH. That is, for the case where E-DPDCH is transmitted on I channel using OVSF codes (4, 3) and (4, 2), E-DPDCH is transmitted on I channel using OVSF code (2, 1).

Likewise, for the case where OVSF codes (4, 3) and (4, 2) are simultaneously allocated to E-DPDCH on the Q channel, the E-DPDCH is transmitted on the Q channel using the OVSF code (2, 1). That is, E-DPDCH is transmitted using (Q, 2, 1).

The tenth embodiment below presents a method that additionally uses possible codes generated from OVSF codes (4, 1) for E-DPDCH, including the Q-channel OVSF codes (256, 64) used by the HS-DPCCH channel. In addition, the tenth embodiment proposes a method of additionally using codes allocated to DPDCH for E-DPDCH.

Tenth embodiment

OVSF codes (Q, 256, 64) for HS-DPCCH are used for additional E-DPDCH. That is, the tenth embodiment allows the HS-DPCCH to use the OVSF code (256, 32) on the Q channel, thereby guaranteeing the EUDCH data rate. In this embodiment, OVSF codes and I/Q channel allocation methods for E-DPDCH are summarized as follows.

1. Two or less E-DPDCH channels are sent

The methods proposed in the first to fifth embodiments are used.

2. Three E-DPDCH channels are sent

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

E-DPDCH3 is allocated to the Q channel using OVSF code (4,1). In this case, the data sent on E-DPDCH3 undergoes QPSK modulation.

Also, the method of using the OVSF code assigned to the DPDCH for the E-DPDCH is as follows.

1. Three or less E-DPDCH channels are transmitted

The methods proposed in the sixth to ninth embodiments are used.

2. Four or less E-DPDCH channels are transmitted

When no DPDCH is transmitted, the fourth E-DPDCH is transmitted on the I channel using OVSF code (4, 1).

As described above, among methods for allocating OVSF codes and I/Q channels to uplink physical channels, the present invention proposes an OVSF code and I/Q channel allocation method for EUDCH service -DPDCH and E-DPCCH while maintaining backward compatibility with DPDCH and DPCCH as uplink physical channels. In addition, the present invention proposes a different HS-DPCCH channel and OVSF code than those defined in the existing Rel-5 standard to increase the maximum EUDCH data rate, and proposes an E-DPDCH for EUDCH service and OVSF code and I/Q channel allocation method optimized for E-DPCCH.

Therefore, the present invention can minimize PARP increase during transmission of packet data for EUDCH service and minimize transmission error of EUDCH packet data, thereby contributing to improvement of EUDCH service performance.

Although the present invention has been shown and described with reference to certain preferred embodiments thereof, it will be understood that various changes in form and details may be made therein by those skilled in the art.

changes without departing from the spirit and scope of the invention as defined in the appended claims.

Claims (31)

1. A method for sending packet data in a mobile communication system, the method comprising the steps of: Use an orthogonal variable spreading factor OVSF code (256, 0) and an orthogonal phase Q channel to generate a dedicated physical control channel DPCCH; Use the OVSF code (SF _DPDCH , SF _DPDCH /4) and the same phase I channel to generate the dedicated physical data channel DPDCH, where SF _DPDCH represents the spreading factor of the DPDCH; Use OVSF code (SF _E-DPCCH , 1) and I channel to generate E-DPCCH, wherein SF _E-DPCCH represents the spreading factor to be allocated to the OVSF code of enhanced dedicated physical control channel E-DPCCH, and E-DPCCH is used for supporting the transmission of enhanced uplink packet data; and The E-DPDCH is generated using the OVSF code (SF _E-DPDCH , SF _E-DPDCH /2) and the Q channel, where SF _E-DPDCH represents the spreading factor SF of the OVSF code to be allocated to the Enhanced Dedicated Physical Data Channel E-DPDCH , the E-DPDCH is used to support the transmission of enhanced uplink packet data. 2. The method as claimed in claim 1, further comprising the step of: if the SFE _-DPDCH is 4 and two E-DPDCHs are transmitted simultaneously, then generating the OVSF code (4, 2 ) Spread spectrum E-DPDCH1 and E-DPDCH2. 3. The method according to claim 1, further comprising the step of: if the SF _E-DPDCH is 2 and two E-DPDCHs are transmitted simultaneously, generating an OVSF code (2, 1) on the I channel and the Q channel respectively Spread spectrum E-DPDCH1 and E-DPDCH2. 4. The method according to claim 1, further comprising the step of generating an _{E-DPDCH spread using OVSF code (2, 1) on the Q channel if the SFE-DPDCH} is 2 and one E-DPDCH is transmitted . 5. The method as claimed in claim 1, further comprising the step of: if an E-DPCCH is transmitted, then generating an E-DPCCH spread using an OVSF code (256, 1) on the I channel. 6. The method as claimed in claim 1, further comprising the step of: if high-speed downlink packet access HSDPA service is realized, then use OVSF code (256, 64) and Q channel to generate high-speed downlink physical control channel HS- DPCCH. 7. The method of claim 1, further comprising the step of generating third and fourth E-DPDCHs using OVSF codes (4, 1) if no DPDCHs are transmitted. 8. The method according to claim 7, further comprising the step of using the OVSF code (4, 1) and the I channel for the third E-DPDCH, and using the OVSF code (4, 1) and the I channel for the fourth E-DPDCH Q channel. 9. A device for sending enhanced packet data in a mobile communication system, the device comprising: The controller is used for assigning the orthogonal variable spreading factor OVSF code (256, 0) and the quadrature phase Q channel to the dedicated physical control channel DPCCH, and assigning the OVSF code (SF _DPDCH , SF _DPDCH /4) and the same phase I The channel is allocated to the dedicated physical data channel DPDCH, where SF _DPDCH represents the spreading factor of DPDCH, and the OVSF code (SF _E-DPCCH , 1) and the I channel are allocated to the enhanced dedicated physical control channel E-DPCCH, where SF _E-DPCCH represents The spreading factor of the OVSF code to be assigned to the E-DPCCH, which is used to support the transmission of enhanced uplink packet data, and the OVSF code (SF _E-DPDCH , SF _E-DPDCH /2) and Q channel allocation For the enhanced dedicated physical data channel E-DPDCH, where SF _E-DPDCH indicates the spreading factor of the OVSF code to be allocated to the E-DPDCH, and the E-DPDCH is used to support the transmission of enhanced uplink packet data; A spreader, used for spreading E-DPDCH and E-DPCCH according to a control signal from the controller; a summer for summing the spread E-DPDCH and E-DPCCH; and Transmitter for sending the aggregated signal. 10. The device according to claim 9, wherein if the SFE _-DPDCH is 4 and two E-DPDCHs are transmitted simultaneously, the controller assigns the OVSF code (4, 2) to the first One E-DPDCH and the second E-DPDCH. 11. The device according to claim 9, wherein if the SFE _-DPDCH is 2 and two E-DPDCHs are transmitted simultaneously, the controller assigns the OVSF code (2, 1) to the first One E-DPDCH and the second E-DPDCH. 12. The apparatus of claim 9, wherein if the SF _E-DPDCH is 2 and one E-DPDCH is transmitted, the controller assigns the OVSF code (2, 1) to the E-DPDCH on the Q channel. 13. The apparatus of claim 9, wherein the controller assigns an OVSF code (256, 1) to the E-DPCCH on the I channel. 14. The device as claimed in claim 9, wherein if high-speed downlink packet access HSDPA service is implemented, the controller assigns OVSF codes (256, 64) to the high-speed downlink physical control channel HS- DPCCH. 15. The apparatus of claim 9, wherein when the DPDCH is not transmitted, the controller assigns the third and fourth E-DPDCHs to the Q channel and the I channel with OVSF codes (4, 1), respectively. 16. A method for receiving enhanced packet data in a mobile communication system, the method comprising the steps of: receiving information representing transmission channel conditions from a user equipment UE; Sending scheduling allocation information representing the data rate information of the enhanced dedicated physical data channel E-DPDCH to the UE; Use an orthogonal variable spreading factor OVSF code (256, 0) and an orthogonal phase Q channel to receive a dedicated physical control channel DPCCH; Use the OVSF code (SF _DPDCH , SF _DPDCH /4) and the same phase I channel to receive the dedicated physical data channel DPDCH, where SF _DPDCH represents the spreading factor of the DPDCH; Use OVSF code (SF _E-DPCCH , 1) and I channel to receive enhanced dedicated physical control channel E-DPCCH, wherein SF _E-DPCCH represents the spreading factor of the OVSF code to be allocated to E-DPCCH, and E-DPCCH is used for supporting the transmission of enhanced uplink packet data; and Use OVSF code (SF _E-DPDCH , SF _E-DPDCH /2) and Q channel to receive E-DPDCH, where SF _E-DPDCH represents the spreading factor of the OVSF code to be assigned to E-DPDCH, and E-DPDCH is used for Enhanced transmission of uplink packet data is supported. 17. The method according to claim 16, further comprising the step of: if the SF _E-DPDCH is 4 and two E-DPDCHs are transmitted simultaneously, receiving on the I channel and the Q channel using the OVSF code (4, 2) respectively The first E-DPDCH and the second E-DPDCH. 18. The method according to claim 16, further comprising the step of: if the SF _E-DPDCH is 2 and two E-DPDCHs are transmitted simultaneously, receiving with OVSF code (2, 1) on the I channel and the Q channel respectively The first E-DPDCH and the second E-DPDCH. 19. The method of claim 16, further comprising the step of receiving the E-DPDCH on the Q channel using OVSF code (2, 1) if the SF _E-DPDCH is 2 and one E-DPDCH is transmitted. 20. The method of claim 16, further comprising the step of receiving the E-DPCCH on the I channel using an OVSF code (256, 1) if the E-DPCCH is transmitted. 21. The method as claimed in claim 16, further comprising the step of receiving the High Speed Downlink Physical Control Channel HS- DPCCH. 22. The method of claim 16, further comprising the step of receiving third and fourth E-DPDCHs using OVSF codes (4, 1) if no DPDCHs are transmitted. 23. The method of claim 16, wherein the third E-DPDCH is received using the OVSF code (4, 1) and the I channel and the OVSF code (4, 1) and the Q channel is used to receive the third E-DPDCH without establishing the DPDCH Fourth E-DPDCH. 24. A device for receiving enhanced packet data in a mobile communication system, the device comprising: A receiver for receiving information representing transmission channel conditions from a user equipment UE, using an orthogonal variable spreading factor OVSF code (256, 0) and a quadrature phase Q channel to receive a dedicated physical control channel DPCCH, using an OVSF code ( SF _DPDCH , SF _DPDCH /4) and the same phase I channel to receive the dedicated physical data channel DPDCH, where SF _DPDCH represents the spreading factor of the DPDCH, using the OVSF code (SF _E-DPCCH , 1) and the I channel to receive the enhanced dedicated physical data channel The control channel E-DPCCH, where SF _E-DPCCH represents the spreading factor of the OVSF code to be assigned to the E _- DPCCH used to support the transmission of enhanced uplink packet , SF _E-DPDCH /2) and Q channel to receive enhanced dedicated physical data channel E-DPDCH, where SF _E-DPDCH represents the spreading factor of the OVSF code to be allocated to E-DPDCH, and E-DPDCH is used to support enhanced uplink Transmission of link packet data; a transmitter, configured to transmit scheduling allocation information representing data rate information of the E-DPDCH to the UE; and Controller, used to control the receiver and transmitter. 25. The device of claim 24, wherein if the SFE _-DPDCH is 4 and two E-DPDCHs are transmitted simultaneously, the receiver receives the first E-DPDCH and second E-DPDCH. 26. The device of claim 24, wherein if the SF _E-DPDCH is 2 and two E-DPDCHs are transmitted simultaneously, the receiver receives the first E-DPDCH and second E-DPDCH. 27. The apparatus of claim 24, wherein if the SF _E-DPDCH is 2 and one E-DPDCH is transmitted, the receiver receives the E-DPDCH on the Q channel using OVSF code (2, 1). 28. The apparatus of claim 24, wherein if an E-DPCCH is transmitted, the receiver receives the E-DPCCH on an I channel using an OVSF code (256, 1). 29. The apparatus of claim 24, wherein the receiver receives the High Speed Downlink Physical Control Channel HS-DPCCH using OVSF codes (256, 64) and a Q channel if a High Speed Downlink Packet Access (HSDPA) service is implemented. 30. The apparatus of claim 24, wherein if no DPDCH is transmitted, the receiver receives the third and fourth E-DPDCHs using OVSF code (4, 1). 31. The device of claim 24, wherein the receiver receives the third E-DPDCH using the OVSF code (4, 1) and the I channel when the DPDCH is not established, and uses the OVSF code (4, 1) and the Q The channel receives the fourth E-DPDCH.

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